Wireless charging circuit, charging device and device to be charged

Abstract

The present application applies to the field of wireless charging technology and provides a wireless charging circuit, a charging device, and a device to be charged. The wireless charging circuit includes: a transmitter circuit, a rectifier circuit, and an inverter circuit. The output of the rectifier circuit is connected to the input of the inverter circuit, and the output of the inverter circuit is connected to the transmitter circuit. The transmitter circuit includes: a first transmitter coil and a second transmitter coil, the first transmitter coil and the second transmitter coil being connected in series, each comprising a cylindrical magnetic core and a wire wound around the cylindrical magnetic core. Without compromising charging performance, the wireless charging circuit, based on the compactness and flexibility of the first and second transmitter coils, can adapt to narrow or irregular spaces, thereby reducing assembly space requirements, improving assembly flexibility and adaptability, and providing greater design space for a thin and lightweight device.

Description

Technical Field

[0001] The present application belongs to the field of wireless charging technology, and in particular relates to a wireless charging circuit, a charging device, and a device to be charged. Background Art

[0002] With the continuous development of wireless charging technology, wireless charging circuits can be set in the charging device and the device to be charged, and the device to be charged can be charged using wireless charging technology.

[0003] In related technologies, wireless charging circuits may include a transmitter circuit and a receiver circuit. The transmitter circuit is located in a charging device (such as a charger or charging base) or integrated into a terminal device, while the receiver circuit is located in the device to be charged (such as a terminal device or stylus). The transmitter circuit is equipped with a flat coil for generating a changing magnetic field, while the receiver circuit is equipped with a cylindrical coil for generating an induced current. When the magnetic field generated by the flat coil changes, the cylindrical coil generates an induced current, thereby charging the device to be charged.

[0004] However, the flat coil occupies a large space, and a smaller charging device or a smaller terminal device with an integrated transmitter circuit may not be able to accommodate the flat coil, thereby causing the problem of being unable to perform wireless charging. Summary of the Invention

[0005] The embodiments of the present application provide a wireless charging circuit, a charging device, and a device to be charged, which can solve the problem that a flat coil cannot be accommodated, resulting in an inability to perform wireless charging.

[0006] In a first aspect, an embodiment of the present application provides a wireless charging circuit, including:

[0007] A transmitter circuit, a rectifier circuit, and an inverter circuit, wherein the output of the rectifier circuit is connected to the input of the inverter circuit, and the output of the inverter circuit is connected to the transmitter circuit;

[0008] The transmitting end circuit includes: a first transmitting coil and a second transmitting coil, the first transmitting coil and the second transmitting coil are connected in series, and the first transmitting coil and the second transmitting coil each include a cylindrical magnetic core and a wire wound around the cylindrical magnetic core.

[0009] In a first possible implementation of the first aspect, the output end of the inverter circuit includes a first output end and a second output end, and the transmitter circuit further includes: a first series switch, the first series switch including an input end, a first output end, and a second output end;

[0010] The first series switch is connected in series between the first transmitting coil and the second transmitting coil. If the input end of the first series switch is connected to the first output end of the first series switch, the second transmitting coil is disconnected from the transmitting end circuit. If the input end of the first series switch is connected to the second output end of the first series switch, the second transmitting coil is connected to the transmitting end circuit.

[0011] Alternatively, the first series switch is connected in series between the first transmitting coil and the first output terminal of the inverter circuit. If the input terminal of the first series switch is connected to the first output terminal of the first series switch, the first transmitting coil is cut out of the transmitting circuit. If the input terminal of the first series switch is connected to the second output terminal of the first series switch, the first transmitting coil is connected to the transmitting circuit.

[0012] For example, the input end of the first series switch may be connected to the output end of the first transmitting coil, the first output end of the first series switch may be connected to the second output end of the inverter circuit and the output end of the second transmitting coil respectively, and the second output end of the first series switch may be connected to the input end of the second transmitting coil;

[0013] Alternatively, another connection method may be used. For example, the input end of the first series switch may be connected to the first output end of the inverter circuit, the first output end of the first series switch may be connected to the output end of the first transmitting coil and the input end of the second transmitting coil, respectively, and the second output end of the first series switch may be connected to the input end of the first transmitting coil.

[0014] Based on the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the transmitter circuit further includes: a second series switch, the second series switch including an input end, a first output end, and a second output end;

[0015] If the first series switch is connected in series between the first transmitting coil and the first output terminal of the inverter circuit, the second series switch is connected in series between the first transmitting coil and the second transmitting coil. If the input terminal of the second series switch is connected to the first output terminal of the second series switch, the second transmitting coil is disconnected from the transmitting circuit. If the input terminal of the second series switch is connected to the second output terminal of the second series switch, the second transmitting coil is connected to the transmitting circuit.

[0016] For example, the input end of the first series switch can be connected to the first output end of the inverter circuit, the first output end of the first series switch can be connected to the output end of the first transmitting coil, and the second output end of the first series switch can be connected to the input end of the first transmitting coil.

[0017] Moreover, the input end of the second series switch can be connected to the first output end of the first series switch, the first output end of the second series switch can be connected to the second output end of the inverter circuit and the output end of the second transmitting coil respectively, and the second output end of the second series switch can be connected to the input end of the second transmitting coil.

[0018] Based on the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the transmitter circuit further includes: a first parallel switch and a second parallel switch, the first parallel switch including a first end and a second end, and the second parallel switch including an input end, a first output end, and a second output end;

[0019] The first parallel switch is connected in series between the first output terminal of the inverter circuit and the second series switch, and the second parallel switch is connected in series between the first series switch and the second series switch;

[0020] When the first parallel switch is closed, if the input terminal of the second parallel switch is connected to the first output terminal of the second parallel switch, the first transmitting coil and the second transmitting coil are connected in parallel; if the input terminal of the second parallel switch is connected to the second output terminal of the second parallel switch, the first transmitting coil is cut out of the transmitting end circuit;

[0021] When the first parallel switch is disconnected, if the input end of the second parallel switch is connected to the second output end of the second parallel switch, the first transmitting coil and the second transmitting coil are connected in series; if the input end of the second parallel switch is connected to the first output end of the second parallel switch, the second transmitting coil is cut out of the transmitting end circuit.

[0022] For example, the first end of the first parallel switch can be connected to the first output end of the inverter circuit, the second end of the first parallel switch can be connected to the second output end of the second parallel switch, and the input end of the second parallel switch can be connected to the first output end of the first series switch, the first output end of the second parallel switch can be connected to the second output end of the inverter circuit, and the second output end of the second parallel switch can be connected to the input end of the second series switch.

[0023] Based on the first possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the transmitting-end circuit further includes: a third transmitting coil;

[0024] The first transmitting coil, the second transmitting coil and the third transmitting coil are connected in series in sequence;

[0025] The first series switch is connected in series between the second transmitting coil and the third transmitting coil. If the input end of the first series switch is connected to the first output end of the first series switch, the third transmitting coil is disconnected from the transmitting circuit. If the input end of the first series switch is connected to the second output end of the first series switch, the third transmitting coil is connected to the transmitting circuit.

[0026] For example, the first transmitting coil, the second transmitting coil, and the third transmitting coil may be connected in series in sequence.

[0027] The input end of the first series switch can be connected to the first output end of the inverter circuit, the first output end of the first series switch can be connected to the output end of the first transmitting coil and the input end of the second transmitting coil respectively, and the second output end of the first series switch can be connected to the input end of the first transmitting coil.

[0028] Alternatively, the input terminal of the first series switch may be connected to the output terminal of the first transmitting coil, the first output terminal of the first series switch may be connected to the output terminal of the second transmitting coil and the input terminal of the third transmitting coil respectively, and the second output terminal of the first series switch may be connected to the input terminal of the second transmitting coil.

[0029] Alternatively, the input end of the first series switch may be connected to the output end of the second transmitting coil, the first output end of the first series switch may be connected to the output end of the third transmitting coil and the second output end of the inverter circuit respectively, and the second output end of the first series switch may be connected to the input end of the third transmitting coil.

[0030] Based on the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the transmitter circuit further includes: a second series switch, the second series switch including an input end, a first output end, and a second output end;

[0031] If the first series switch is connected in series between the first transmitting coil and the first output terminal of the inverter circuit, the second series switch is connected in series between the first transmitting coil and the second transmitting coil, or the second series switch is connected in series between the second transmitting coil and the third transmitting coil. If the input terminal of the second series switch is connected to the first output terminal of the second series switch, the second transmitting coil or the third transmitting coil is disconnected from the transmitting circuit. If the input terminal of the second series switch is connected to the second output terminal of the second series switch, the second transmitting coil or the third transmitting coil is connected to the transmitting circuit.

[0032] If the first series switch is connected in series between the first transmitting coil and the second transmitting coil, the second series switch is connected in series between the second transmitting coil and the third transmitting coil. If the input end of the second series switch is connected to the first output end of the second series switch, the third transmitting coil is disconnected from the transmitting circuit. If the input end of the second series switch is connected to the second output end of the second series switch, the third transmitting coil is connected to the transmitting circuit.

[0033] For example, when the first series switch is connected in series between the first output terminal of the inverter circuit and the first transmitting coil, the input terminal of the second series switch can be connected to the first output terminal of the first series switch, the first output terminal of the second series switch can be connected to the output terminal of the second transmitting coil and the input terminal of the third transmitting coil, respectively, and the second output terminal of the second series switch can be connected to the input terminal of the second transmitting coil.

[0034] Alternatively, when the first series switch is connected in series between the first output terminal of the inverter circuit and the first transmitting coil, the input terminal of the second series switch can be connected to the output terminal of the second transmitting coil, the first output terminal of the second series switch can be connected to the output terminal of the third transmitting coil and the second output terminal of the inverter circuit, respectively, and the second output terminal of the second series switch can be connected to the input terminal of the third transmitting coil.

[0035] Alternatively, when the first series switch is connected in series between the first transmitting coil and the second transmitting coil, the input end of the second series switch can be connected to the first output end of the first series switch, the first output end of the second series switch can be connected to the output end of the third transmitting coil and the second output end of the inverter circuit respectively, and the second output end of the second series switch can be connected to the input end of the third transmitting coil.

[0036] Based on the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the transmitter circuit further includes: a third series switch, the third series switch including an input end, a first output end, and a second output end;

[0037] If the first series switch is connected in series between the first transmitting coil and the first output terminal of the inverter circuit, and the second series switch is connected in series between the first transmitting coil and the second transmitting coil, then the third series switch is connected in series between the second transmitting coil and the third transmitting coil;

[0038] If the input end of the third series switch is connected to the first output end of the third series switch, the third transmitting coil is cut out of the transmitting end circuit; if the input end of the third series switch is connected to the second output end of the third series switch, the third transmitting coil is connected to the transmitting end circuit.

[0039] For example, the input end of the first series switch can be connected to the first output end of the inverter circuit, the first output end of the first series switch can be connected to the output end of the first transmitting coil, and the second output end of the first series switch can be connected to the input end of the first transmitting coil.

[0040] Moreover, the input end of the second series switch can be connected to the first output end of the first series switch, the first output end of the second series switch can be connected to the output end of the second transmitting coil, and the second output end of the second series switch can be connected to the input end of the second transmitting coil.

[0041] At the same time, the input end of the third series switch can be connected to the first output end of the second series switch, the first output end of the third series switch can be connected to the output end of the second transmitting coil and the second output end of the inverter circuit respectively, and the second output end of the third series switch can be connected to the input end of the third transmitting coil.

[0042] Based on the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, the transmitter circuit further includes: a first parallel switch and a second parallel switch, the first parallel switch including a first end and a second end, and the second parallel switch including an input end, a first output end, and a second output end;

[0043] The first parallel switch is connected in series between the second series switch and the first output terminal of the inverter circuit, the second parallel switch is connected in series between the first series switch and the second series switch, and the second transmitting coil is connected in series with the third transmitting coil;

[0044] When the first parallel switch is closed, if the input terminal of the second parallel switch is connected to the first output terminal of the second parallel switch, the first transmitting coil is connected in parallel with the second transmitting coil and the third transmitting coil that are connected in series; if the input terminal of the second parallel switch is connected to the second output terminal of the second parallel switch, the first transmitting coil is cut out of the transmitting end circuit;

[0045] When the first parallel switch is disconnected, if the input terminal of the second parallel switch is connected to the second output terminal of the second parallel switch, the first transmitting coil and the second transmitting coil are connected in series; if the input terminal of the second parallel switch is connected to the first output terminal of the second parallel switch, the second transmitting coil and the third transmitting coil are cut out of the transmitting end circuit;

[0046] Alternatively, the first parallel switch is connected in series between the third series switch and the first output terminal of the inverter circuit, the second parallel switch is connected in series between the second series switch and the third series switch, and the first transmitting coil and the second transmitting coil are connected in series;

[0047] When the first parallel switch is closed, if the input terminal of the second parallel switch is connected to the first output terminal of the second parallel switch, the first transmitting coil and the second transmitting coil, which are connected in series, are connected in parallel with the third transmitting coil; and if the input terminal of the second parallel switch is connected to the second output terminal of the second parallel switch, the first transmitting coil and the second transmitting coil are cut out of the transmitting end circuit;

[0048] When the first parallel switch is disconnected, if the input end of the second parallel switch is connected to the second output end of the second parallel switch, the second transmitting coil is connected in series with the third transmitting coil; if the input end of the second parallel switch is connected to the first output end of the second parallel switch, the third transmitting coil is cut out of the transmitting end circuit.

[0049] For example, the first end of the first parallel switch can be connected to the first output end of the inverter circuit, the second end of the first parallel switch can be connected to the second output end of the second parallel switch, and the first output end of the second parallel switch can be connected to the second output end of the inverter circuit.

[0050] Moreover, the input end of the second parallel switch can be connected to the first output end of the first series switch, and the second output end of the second parallel switch can be connected to the input end of the second series switch, or the input end of the second parallel switch can be connected to the first output end of the second series switch, and the second output end of the second parallel switch can be connected to the input end of the third series switch.

[0051] Based on the seventh possible implementation manner of the first aspect, in an eighth possible implementation manner of the first aspect, the transmitting-end circuit further includes: a third parallel switch and a fourth parallel switch, the third parallel switch including a first end and a second end, and the fourth parallel switch each including an input end, a first output end, and a second output end;

[0052] If the first parallel switch is connected in series between the second series switch and the first output terminal of the inverter circuit, and the second parallel switch is connected in series between the first series switch and the second series switch, then the third parallel switch is connected in series between the third series switch and the first output terminal of the inverter circuit, and the fourth parallel switch is connected in series between the second series switch and the third series switch;

[0053] When the third parallel switch is closed, if the input terminal of the fourth parallel switch is connected to the first output terminal of the fourth parallel switch, the first transmitting coil and / or the second transmitting coil are connected in parallel with the third transmitting coil; if the input terminal of the fourth parallel switch is connected to the second output terminal of the fourth parallel switch, the first transmitting coil and the second transmitting coil are cut out of the transmitting end circuit;

[0054] When the third parallel switch is disconnected, if the input end of the fourth parallel switch is connected to the second output end of the fourth parallel switch, the first transmitting coil and / or the second transmitting coil are connected in series with the third transmitting coil; if the input end of the fourth parallel switch is connected to the first output end of the fourth parallel switch, the third transmitting coil is cut out of the transmitting end circuit.

[0055] For example, the first end of the first parallel switch and the first end of the third parallel switch can both be connected to the first output end of the inverter circuit, the second end of the first parallel switch can be connected to the second output end of the second parallel switch, the second end of the third parallel switch can be connected to the second output end of the fourth parallel switch, and the first output end of the second parallel switch and the first output end of the fourth parallel switch can both be connected to the second output end of the inverter circuit.

[0056] Furthermore, the input end of the second parallel switch can be connected to the first output end of the first series switch, and the second output end of the second parallel switch can be connected to the input end of the second series switch. Similarly, the input end of the fourth parallel switch can be connected to the first output end of the second series switch, and the second output end of the fourth parallel switch can be connected to the input end of the third series switch.

[0057] In a second aspect, an embodiment of the present application further provides a wireless charging circuit, comprising: a transmitter circuit, a rectifier circuit, and an inverter circuit, wherein the output end of the rectifier circuit is connected to the input end of the inverter circuit, and the output end of the inverter circuit is connected to the transmitter circuit;

[0058] The transmitting end circuit includes: a first transmitting coil and a second transmitting coil, the first transmitting coil and the second transmitting coil are connected in parallel, and the first transmitting coil and the second transmitting coil each include a cylindrical magnetic core and a wire wound around the cylindrical magnetic core.

[0059] In a first possible implementation of the second aspect, the output end of the inverter circuit includes a first output end and a second output end, the transmitter circuit further includes a first parallel switch, and the first parallel switch includes a first end and a second end;

[0060] The first parallel switch is connected in series between the first output terminal of the inverter circuit and the first transmitting coil. When the first parallel switch is closed, the first transmitting coil is connected in parallel to the transmitting end circuit. When the first parallel switch is opened, the first transmitting coil is disconnected from the transmitting end circuit.

[0061] Alternatively, the first parallel switch is connected in series between the first output terminal of the inverter circuit and the second transmitting coil. If the first parallel switch is closed, the second transmitting coil is connected in parallel to the transmitting end circuit. If the first parallel switch is opened, the second transmitting coil is disconnected from the transmitting end circuit.

[0062] For example, the first parallel switch may include a first end and a second end, and the first end of the first parallel switch may be connected to the first output end of the inverter circuit, and the second end of the first parallel switch may be connected to the input end of the first transmitting coil or the input end of the second transmitting coil; alternatively, the first end of the first parallel switch may be connected to the second output end of the inverter circuit, and the second end of the first parallel switch may be connected to the output end of the first transmitting coil or the output end of the second transmitting coil.

[0063] Based on the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the transmitting-end circuit further includes a second parallel switch, and the second parallel switch includes a first end and a second end;

[0064] If the first parallel switch is connected in series between the first output terminal of the inverter circuit and the first transmitting coil, then the second parallel switch is connected in series between the first output terminal of the inverter circuit and the second transmitting coil. If the second parallel switch is closed, the second transmitting coil is connected in parallel to the transmitting circuit. If the second parallel switch is open, the second transmitting coil is disconnected from the transmitting circuit.

[0065] For example, the second parallel switch also includes a first end and a second end. The first end of the first parallel switch and the first end of the second parallel switch can both be connected to the first output end of the inverter circuit, the second end of the first parallel switch can be connected to the input end of the first transmitting coil, and the second end of the second parallel switch can be connected to the input end of the second transmitting coil.

[0066] Alternatively, the first end of the first parallel switch and the first end of the second parallel switch can both be connected to the second output end of the inverter circuit, the second end of the first parallel switch can be connected to the output end of the first transmitting coil, and the second end of the second parallel switch can be connected to the output end of the second transmitting coil.

[0067] Based on the first possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the transmitter circuit further includes a third parallel switch, a first series switch, and a second series switch, and the third parallel switch, the first series switch, and the second series switch each include an input end, a first output end, and a second output end;

[0068] The first series switch is connected in series between the first output terminal of the inverter circuit and the first transmitting coil, the third parallel switch and the second series switch are connected in series between the first transmitting coil and the second transmitting coil, and the first parallel switch is connected in series between the first output terminal of the inverter circuit and the second series switch;

[0069] If the input end of the first series switch is connected to the first output end of the first series switch, the first transmitting coil is cut out of the transmitting end circuit; if the input end of the first series switch is connected to the second output end of the first series switch, the first transmitting coil is connected to the transmitting end circuit;

[0070] If the input end of the second series switch is connected to the first output end of the second series switch, the second transmitting coil is cut out of the transmitting end circuit; if the input end of the second series switch is connected to the second output end of the second series switch, the second transmitting coil is connected to the transmitting end circuit;

[0071] When the first parallel switch is closed, if the input end of the third parallel switch is connected to the first output end of the third parallel switch, the second transmitting coil is connected in parallel to the transmitting end circuit; if the input end of the third parallel switch is connected to the second output end of the third parallel switch, the first transmitting coil is disconnected from the transmitting end circuit;

[0072] When the first parallel switch is disconnected, if the input end of the third parallel switch is connected to the first output end of the third parallel switch, the second transmitting coil is cut out of the transmitting end circuit; if the input end of the third parallel switch is connected to the second output end of the third parallel switch, the second transmitting coil is connected in series with the transmitting end circuit.

[0073] For example, the third parallel switch may include an input end, a first output end, and a second output end. The first end of the first parallel switch may be connected to the first output end of the inverter circuit, the second end of the first parallel switch may be connected to the second output end of the third parallel switch, the input end of the third parallel switch may be connected to the first output end of the first series switch, the first output end of the third parallel switch may be connected to the second output end of the inverter circuit, and the second output end of the third parallel switch may be connected to the input end of the second series switch.

[0074] Furthermore, the first series switch and the second series switch may also include an input terminal, a first output terminal, and a second output terminal. The input terminal of the first series switch may be connected to the first output terminal of the inverter circuit, the first output terminal of the first series switch may be connected to the output terminal of the first transmitting coil, and the second output terminal of the first series switch may be connected to the input terminal of the first transmitting coil. Similarly, the first output terminal of the second series switch may be connected to the output terminal of the second transmitting coil and the second output terminal of the inverter circuit, respectively, and the second output terminal of the second series switch may be connected to the input terminal of the second transmitting coil.

[0075] Based on the first possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, the transmitting-end circuit further includes a third transmitting coil;

[0076] The first transmitting coil, the second transmitting coil and the third transmitting coil are connected in parallel;

[0077] The first parallel switch is connected in series between the first output terminal of the inverter circuit and the third transmitting coil. If the first parallel switch is closed, the third transmitting coil is connected in parallel to the transmitting end circuit. If the first parallel switch is opened, the third transmitting coil is disconnected from the transmitting end circuit.

[0078] For example, the first end of the first parallel switch can be connected to the first output end of the inverter circuit, and the second end of the first parallel switch can be connected to the input end of the first transmitting coil, the input end of the second transmitting coil, or the input end of the third transmitting coil; or, the first end of the first parallel switch can be connected to the second output end of the inverter circuit, and the second end of the first parallel switch can be connected to the output end of the first transmitting coil, the output end of the second transmitting coil, or the output end of the third transmitting coil.

[0079] Based on the fourth possible implementation manner of the second aspect, in a fifth possible implementation manner of the second aspect, the transmitting-end circuit further includes a second parallel switch, where the second parallel switch includes a first end and a second end;

[0080] If the first parallel switch is connected in series between the first output terminal of the inverter circuit and the first transmitting coil, then the second parallel switch is connected in series between the first output terminal of the inverter circuit and the second transmitting coil. If the second parallel switch is closed, the second transmitting coil is connected in parallel to the transmitting end circuit. If the second parallel switch is opened, the second transmitting coil is disconnected from the transmitting end circuit.

[0081] Alternatively, if the first parallel switch is connected in series between the first output terminal of the inverter circuit and the first transmitting coil, then the second parallel switch is connected in series between the first output terminal of the inverter circuit and the third transmitting coil. If the second parallel switch is closed, the third transmitting coil is connected in parallel to the transmitting circuit. If the second parallel switch is open, the third transmitting coil is disconnected from the transmitting circuit.

[0082] Alternatively, if the first parallel switch is connected in series between the first output terminal of the inverter circuit and the second transmitting coil, the second parallel switch is connected in series between the first output terminal of the inverter circuit and the third transmitting coil. If the second parallel switch is closed, the third transmitting coil is connected in parallel to the transmitting circuit. If the second parallel switch is open, the third transmitting coil is disconnected from the transmitting circuit.

[0083] For example, the first end of the first parallel switch and the first end of the second parallel switch can both be connected to the first output end of the inverter circuit. If the second end of the first parallel switch is connected to the input end of the first transmitting coil, the second end of the second parallel switch can be connected to the input end of the second transmitting coil or the input end of the third transmitting coil. If the second end of the first parallel switch is connected to the input end of the second transmitting coil, the second end of the second parallel switch can be connected to the input end of the third transmitting coil.

[0084] Alternatively, the first end of the first parallel switch and the first end of the second parallel switch can both be connected to the second output end of the inverter circuit. If the second end of the first parallel switch is connected to the output end of the first transmitting coil, the second end of the second parallel switch can be connected to the output end of the second transmitting coil or the output end of the third transmitting coil. If the second end of the first parallel switch is connected to the output end of the second transmitting coil, the second end of the second parallel switch can be connected to the output end of the third transmitting coil.

[0085] Based on the fifth possible implementation manner of the second aspect, in a sixth possible implementation manner of the second aspect, the transmitting-end circuit further includes a fourth parallel switch, and the fourth parallel switch includes a first end and a second end;

[0086] If the first parallel switch is connected in series between the first output terminal of the inverter circuit and the first transmitting coil, and the second parallel switch is connected in series between the first output terminal of the inverter circuit and the second transmitting coil, then the fourth parallel switch is connected in series between the first output terminal of the inverter circuit and the third transmitting coil;

[0087] If the fourth parallel switch is closed, the third transmitting coil is connected in parallel to the transmitting end circuit; if the fourth parallel switch is opened, the third transmitting coil is cut out of the transmitting end circuit.

[0088] For example, the fourth parallel switch may include a first end and a second end, the first end of the first parallel switch, the first end of the second parallel switch, and the first end of the fourth parallel switch are all connected to the first output end of the inverter circuit, the second end of the first parallel switch is connected to the input end of the first transmitting coil, the second end of the second parallel switch is connected to the input end of the second transmitting coil, and the second end of the fourth parallel switch is connected to the input end of the third transmitting coil.

[0089] Alternatively, the first end of the first parallel switch, the first end of the second parallel switch, and the first end of the fourth parallel switch are all connected to the second output end of the inverter circuit, the second end of the first parallel switch is connected to the output end of the first transmitting coil, the second end of the second parallel switch is connected to the output end of the second transmitting coil, and the second end of the fourth parallel switch is connected to the output end of the third transmitting coil.

[0090] Based on the fourth possible implementation manner of the second aspect, in a seventh possible implementation manner of the second aspect, the transmitter circuit further includes a third parallel switch, a first series switch, a second series switch, and a third series switch, and the third parallel switch, the first series switch, the second series switch, and the third series switch each include an input end, a first output end, and a second output end;

[0091] The first series switch is connected in series between the first output terminal of the inverter circuit and the first transmitting coil, the second series switch is connected in series between the first transmitting coil and the second transmitting coil, and the third series switch is connected in series between the second transmitting coil and the third transmitting coil;

[0092] If the input end of the first series switch is connected to the first output end of the first series switch, the first transmitting coil is cut out of the transmitting end circuit; if the input end of the first series switch is connected to the second output end of the first series switch, the first transmitting coil is connected to the transmitting end circuit;

[0093] If the input end of the second series switch is connected to the first output end of the second series switch, the second transmitting coil is cut out of the transmitting end circuit; if the input end of the second series switch is connected to the second output end of the second series switch, the second transmitting coil is connected to the transmitting end circuit;

[0094] If the input end of the third series switch is connected to the first output end of the third series switch, the third transmitting coil is cut out of the transmitting end circuit; if the input end of the third series switch is connected to the second output end of the third series switch, the third transmitting coil is connected to the transmitting end circuit;

[0095] If the first parallel switch is connected in series between the first output terminal of the inverter circuit and the second series switch, the third parallel switch is connected in series between the first and second series switches, and the second and third transmitting coils are connected in series. When the first parallel switch is closed, if the input terminal of the third parallel switch is connected to the first output terminal of the third parallel switch, the second and third transmitting coils connected in series are connected in parallel to the transmitting circuit. If the input terminal of the third parallel switch is connected to the second output terminal of the third parallel switch, the first transmitting coil is disconnected from the transmitting circuit. When the first parallel switch is open, if the input terminal of the third parallel switch is connected to the first output terminal of the third parallel switch, the second and third transmitting coils are disconnected from the transmitting circuit. If the input terminal of the third parallel switch is connected to the second output terminal of the third parallel switch, the second and third transmitting coils are connected in series to the transmitting circuit.

[0096] If the first parallel switch is connected in series between the first output terminal of the inverter circuit and the third series switch, the third parallel switch is connected in series between the second series switch and the third series switch, and the first transmitting coil and the second transmitting coil are connected in series. When the first parallel switch is closed, if the input terminal of the third parallel switch is connected to the first output terminal of the third parallel switch, the third transmitting coil is connected in parallel to the transmitting circuit. If the input terminal of the third parallel switch is connected to the second output terminal of the third parallel switch, the first transmitting coil and the second transmitting coil are disconnected from the transmitting circuit. When the first parallel switch is open, if the input terminal of the third parallel switch is connected to the first output terminal of the third parallel switch, the third transmitting coil is disconnected from the transmitting circuit. If the input terminal of the third parallel switch is connected to the second output terminal of the third parallel switch, the third transmitting coil is connected in series to the transmitting circuit.

[0097] For example, the first end of the first parallel switch can be connected to the first output end of the inverter circuit, the second end of the first parallel switch can be connected to the second output end of the third parallel switch, and the first output end of the third parallel switch can be connected to the second output end of the inverter circuit.

[0098] Furthermore, the input terminal of the first series switch can be connected to the first output terminal of the inverter circuit, the first output terminal of the first series switch can be connected to the output terminal of the first transmitting coil, and the second output terminal of the first series switch can be connected to the input terminal of the first transmitting coil; similarly, the first output terminal of the second series switch can be connected to the output terminal of the second transmitting coil, and the second output terminal of the second series switch can be connected to the input terminal of the second transmitting coil; the first output terminal of the third series switch can be connected to the output terminal of the third transmitting coil and the second output terminal of the inverter circuit, respectively, and the second output terminal of the third series switch can be connected to the input terminal of the third transmitting coil.

[0099] In addition, if the input end of the third parallel switch can be connected to the first output end of the first series switch and the second output end of the third parallel switch can be connected to the input end of the second series switch, then the input end of the third series switch can be connected to the second output end of the second series switch.

[0100] However, if the input end of the third parallel switch can be connected to the first output end of the second series switch, and the second output end of the third parallel switch can be connected to the input end of the third series switch, then the input end of the second series switch can be connected to the second output end of the first series switch.

[0101] Based on the seventh possible implementation manner of the second aspect, in an eighth possible implementation manner of the second aspect, the transmitting-end circuit further includes a second parallel switch and a fifth parallel switch, the second parallel switch includes a first end and a second end, and the fifth parallel switch each includes an input end, a first output end, and a second output end;

[0102] If the first parallel switch is connected in series between the first output terminal of the inverter circuit and the second series switch, and the third parallel switch is connected in series between the first series switch and the second series switch, then the second parallel switch is connected in series between the first output terminal of the inverter circuit and the third series switch, and the fifth parallel switch is connected in series between the second series switch and the third series switch;

[0103] When the second parallel switch is closed, if the input end of the fifth parallel switch is connected to the first output end of the fifth parallel switch, the third transmitting coil is connected in parallel to the transmitting end circuit; if the input end of the fifth parallel switch is connected to the second output end of the fifth parallel switch, the first transmitting coil and the second transmitting coil are disconnected from the transmitting end circuit;

[0104] When the second parallel switch is disconnected, if the input end of the fifth parallel switch is connected to the first output end of the fifth parallel switch, the third transmitting coil is cut out of the transmitting end circuit; if the input end of the fifth parallel switch is connected to the second output end of the fifth parallel switch, the third transmitting coil is connected in series with the transmitting end circuit.

[0105] For example, the input end of the first series switch can be connected to the first output end of the inverter circuit, the first output end of the first series switch can be connected to the output end of the first transmitting coil, and the second output end of the first series switch can be connected to the input end of the first transmitting coil.

[0106] Similarly, the input end of the second series switch can be connected to the second output end of the second parallel switch, the first output end of the second series switch can be connected to the output end of the second transmitting coil, and the second output end of the second series switch can be connected to the input end of the second transmitting coil.

[0107] Moreover, the input end of the third series switch can be connected to the second output end of the fifth parallel switch, the first output end of the third series switch can be connected to the output end of the third transmitting coil, and the second output end of the third series switch can be connected to the input end of the third transmitting coil.

[0108] Furthermore, the first end of the first parallel switch and the first end of the third parallel switch can both be connected to the first output end of the inverter circuit, the second end of the first parallel switch can be connected to the second output end of the second parallel switch, and the second end of the third parallel switch can be connected to the second output end of the fifth parallel switch.

[0109] Similarly, the first output end of the second parallel switch and the first output end of the fifth parallel switch can both be connected to the second output end of the inverter circuit, the input end of the second parallel switch can be connected to the first output end of the first series switch, and the input end of the fifth parallel switch can be connected to the first output end of the second series switch.

[0110] In a third aspect, an embodiment of the present application further provides a wireless charging circuit, comprising: a battery, a rectifier bridge circuit, and a receiving end circuit, wherein the receiving end circuit is connected to an input end of the rectifier bridge circuit, and an output end of the rectifier bridge circuit is connected to the battery;

[0111] The receiving end circuit includes at least two receiving coils, and the at least two receiving coils in the receiving end circuit are connected according to the connection method of the respective transmitting coils in the transmitting end circuit according to any one of the first aspect and the second aspect;

[0112] Each of the receiving coils includes a cylindrical magnetic core and a wire wound around the cylindrical magnetic core.

[0113] In a fourth aspect, an embodiment of the present application further provides a charging device, comprising a transmitting end circuit as described in any one of the first and second aspects, wherein the shape of the arrangement of each transmitting coil in the transmitting end circuit matches the accommodation space of the charging device, and the transmitting end circuit is arranged in the accommodation space.

[0114] In the fifth aspect, an embodiment of the present application also provides a device to be charged, characterized in that the device to be charged includes a receiving end circuit as described in the third aspect, the shape of the arrangement of each receiving coil in the receiving end circuit matches the accommodation space of the device to be charged, and the receiving end circuit is arranged in the accommodation space.

[0115] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0116] The embodiments of the present application provide a wireless charging circuit with a rectifier circuit, an inverter circuit connected to the output of the rectifier circuit, and a transmitter circuit connected to the output of the inverter circuit. Furthermore, the transmitter circuit includes first and second transmitter coils connected in series, each of which includes a cylindrical magnetic core and a wire wound around the cylindrical magnetic core. Without compromising charging performance, the wireless charging circuit, based on the compactness and flexibility of the first and second transmitter coils, can adapt to narrow or irregular spaces. This reduces assembly space requirements, improves assembly flexibility and adaptability, and provides greater design space for a slim and compact device. BRIEF DESCRIPTION OF THE DRAWINGS

[0117] Figure 1 This is a schematic diagram of a scenario involved in a wireless charging circuit provided in an embodiment of the present application;

[0118] Figure 2 This is a structural block diagram of a wireless charging circuit provided by an embodiment of the present application;

[0119] Figure 3 is a schematic structural diagram of a transmitting coil and / or receiving coil provided in an embodiment of the present application;

[0120] Figure 4 This is a schematic structural diagram of a transmitting circuit and a receiving circuit provided in an embodiment of the present application;

[0121] Figure 5 This is a structural block diagram of a wireless charging circuit provided by an embodiment of the present application;

[0122] Figure 6a This is a structural block diagram of a transmitter circuit provided in an embodiment of the present application;

[0123] Figure 6bThis is a structural block diagram of another transmitter circuit provided in an embodiment of the present application;

[0124] Figure 7 This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0125] Figure 8 This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0126] Figure 9a This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0127] Figure 9b This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0128] Figure 9c This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0129] Figure 10a This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0130] Figure 10b This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0131] Figure 10c This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0132] Figure 11 This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0133] Figure 12a This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0134] Figure 12b This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0135] Figure 13 This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0136] Figure 14a This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0137] Figure 14b This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0138] Figure 15 This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0139] Figure 16a This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0140] Figure 16b This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0141] Figure 17 This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0142] Figure 18 This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0143] Figure 19 This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0144] Figure 20a This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0145] Figure 20b This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0146] Figure 20c This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0147] Figure 21 This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0148] Figure 22a This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0149] Figure 22b This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application;

[0150] Figure 23 This is a structural block diagram of another transmitting end circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0151] In the following description, specific details such as specific system structures and technologies are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known circuits, systems, and devices are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0152] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification of this application and the appended claims, the singular expressions "a", "an", "said", "above", and "the" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the embodiments of the present application, "and / or" describes the association relationship of associated objects, indicating that three relationships may exist; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0153] The wireless charging circuit provided in the embodiments of the present application can be applied to terminal devices such as mobile phones, tablet computers, wearable devices, vehicle-mounted devices, augmented reality (AR) / virtual reality (VR) devices, laptop computers, netbooks, personal digital assistants (PDAs), etc. The embodiments of the present application do not impose any restrictions on the specific type of terminal devices.

[0154] For example, the terminal device can be a station (ST) in a WLAN, a cellular phone, a cordless phone, a personal digital assistant (PDA) device, a vehicle-mounted device, a vehicle networking terminal, a computer, a laptop computer, a handheld communication device, a handheld computing device, a satellite wireless device, etc.

[0155] Figure 1 This is a schematic diagram of a scenario involved in a wireless charging circuit provided in an embodiment of the present application, which is provided as an example and not as a limitation. Figure 1 This scenario may include: a charging device 110 and a device to be charged 120, and the device to be charged 120 can be wirelessly charged by the charging device 110.

[0156] Among them, see Figure 2 , a transmitter circuit 1101 of a wireless charging circuit can be set in the charging device 110, and a receiver circuit 1201 of a wireless charging circuit can be set in the device to be charged 120. After the charging device 110 is connected to a power source, each transmitting coil in the transmitter circuit 1101 can generate a changing magnetic field based on the alternating current flowing therethrough, and each receiving coil in the receiver circuit 1201 continuously cuts the magnetic flux lines in the changing magnetic field, thereby generating current to charge the battery in the device to be charged 120.

[0157] Furthermore, a rectifier circuit 1102 and an inverter circuit 1103 may be provided in the charging device 110 . The rectifier circuit 1102 is used to integrate the AC power of the mains into DC power, and the inverter circuit 1103 is used to convert the DC power into AC power that matches the device to be charged 120 .

[0158] The input end of the rectifier circuit 1102 can be connected to the mains power grid, the output end of the rectifier circuit 1102 can be connected to the input end of the inverter circuit 1103, and the output end of the inverter circuit 1103 can be connected to the transmitting coil in the transmitter circuit 1101. For example, the output end of the inverter circuit 1103 may include: a first output end and a second output end.

[0159] Correspondingly, a rectifier bridge circuit 1202 may also be provided in the device to be charged 120. The rectifier bridge circuit 1202 is used to integrate the alternating current generated by each receiving coil in the receiving end circuit 1201 into direct current, thereby charging the battery 1203 in the device to be charged 120 through the integrated direct current.

[0160] The receiving end circuit 1201 in the device to be charged 120 is connected to the input end of the rectifier bridge circuit 1202 , and the output end of the rectifier bridge circuit 1202 is respectively connected to the battery 1203 , that is, respectively connected to the positive and negative poles of the battery 1203 .

[0161] In actual applications, after the charging device 110 is connected to the mains power grid, the grid can provide the charging device 110 with 220V (volt) AC power. The rectifier circuit 1102 can integrate the AC power to obtain DC power, and then the DC power is converted back into AC power that matches the device to be charged 120 through the inverter circuit 1103. The AC power is then input into the transmitter circuit 1101. The transmitting coil in the transmitter circuit 1101 can generate a continuously changing magnetic field based on the AC power flowing through it.

[0162] Correspondingly, each receiving coil of the receiving end circuit 1201 in the device to be charged 120 can continuously cut the magnetic lines of force based on the changing magnetic field to generate alternating current. The generated alternating current can flow into the rectifier bridge circuit 1202, and the generated alternating current is converted into direct current through the rectifier bridge circuit 1202, and then the direct current is input into the battery 1203 to realize charging of the device to be charged 120.

[0163] In this embodiment, the transmitter circuit 1101 in the wireless charging circuit may include multiple transmitter coils, and the receiver circuit 1201 may also include multiple receiver coils. Both the transmitter coil and the receiver coil are relatively small coil modules consisting of a cylindrical magnetic core and a wire wound around the cylindrical magnetic core. Figure 3, protrusion structures can be set at both ends of the magnetic core to guide and gather the magnetic lines of force of the magnetic core, and the wire can be wound between the two protrusion structures of the magnetic core.

[0164] Moreover, the transmitting coil and receiving coil can be arranged in different shapes and placed in different spaces. For example, the transmitting circuit can be placed in the narrow frame of a terminal device with a small space, which can meet the wireless charging needs in narrow frame scenarios. Figure 4 , the transmitter circuit and the receiver circuit in the wireless charging circuit can be as follows Figure 4 As shown, Figure 4 While the example of a straight-line arrangement of the transmitting coils in the transmitting circuit 1101 and the receiving coils in the receiving circuit 1201 is presented here, in practice, the arrangement of the transmitting coils and receiving coils can be adjusted based on the shapes of the charging device and the device to be charged. For example, the transmitting coils can be arranged based on the spatial shape of a tablet device or a laptop computer frame, while the receiving coils can be arranged based on the spatial shape of a stylus or a Bluetooth keyboard.

[0165] For example, a receiving circuit can be set in the stylus and a transmitting circuit can be set in the frame of the tablet device, so that the stylus can be charged when it is placed against the frame of the tablet device; or a receiving circuit can be set in the Bluetooth keyboard and a transmitting circuit can be set in the frame of the tablet device or the frame of the laptop, so that the Bluetooth keyboard can be charged when it is placed against the frame of the tablet device or the frame of the laptop.

[0166] It should be noted that the charging device 110 may include any of the following transmitter circuits 1101, wherein the shape of the arrangement of the individual transmitter coils in the transmitter circuit 1101 matches the accommodation space of the charging device 110, and the transmitter circuit 1101 may be disposed within the accommodation space. Similarly, the device to be charged 120 may include any of the following receiver circuits, wherein the shape of the arrangement of the individual receiver coils in the receiver circuit matches the accommodation space of the device to be charged 120, and the receiver circuit is disposed within the accommodation space.

[0167] Figure 5 This is a block diagram of a wireless charging circuit provided by an embodiment of the present application. For ease of explanation, only the parts related to the embodiment of the present application are shown. Figure 5 As shown, the wireless charging circuit may include: a transmitter circuit 501 , a rectifier circuit 502 and an inverter circuit 503 .

[0168] The transmitting end circuit 501 may include: a first transmitting coil 501a and a second transmitting coil 501b. Moreover, the first transmitting coil 501a and the second transmitting coil 501b may be connected in series. For example, see Figure 5 The input end of the first transmitting coil 501a can be connected to the first output end of the inverter circuit 503, the output end of the first transmitting coil 501a is connected to the input end of the second transmitting coil 501b, and the output end of the second transmitting coil 501b is connected to the second output end of the inverter circuit 503.

[0169] During the charging process of the wireless charging circuit, an alternating current enters the first transmitting coil 501a and the second transmitting coil 501b of the transmitting end circuit 501. As the magnitude and direction of the alternating current change, the first transmitting coil 501a and the second transmitting coil 501b generate a changing magnetic field.

[0170] Correspondingly, the receiving coil in the receiving end circuit of the wireless charging circuit is in the magnetic field formed by the first transmitting coil 501a and the second transmitting coil 501b. The magnetic field generated by the first transmitting coil 501a and the second transmitting coil 501b changes with the change of the alternating current. Accordingly, the magnetic flux lines of the magnetic field generated by each transmitting coil also change, so that the receiving coil cuts the changing magnetic flux lines. Based on the principle of electromagnetic induction, alternating current can be generated in the receiving coil and transmitted to the rectifier circuit 502. The rectifier circuit 502 can integrate the alternating current to obtain direct current, and charge the battery based on the obtained direct current.

[0171] It should be noted that, in the embodiment of the present application, the transmitting end circuit 501 may include multiple transmitting coils, each of which is connected in series end to end. The output end of the first transmitting coil among the multiple transmitting coils can be connected to the input end of the next transmitting coil, but the input end of the first transmitting coil can be connected to the first output end of the inverter circuit 503; similarly, the input end of the last transmitting coil among the multiple transmitting coils can be connected to the output end of the previous transmitting coil, but the output end of the last transmitting coil can be connected to the second output end of the inverter circuit 503.

[0172] based on Figure 5 The wireless charging circuit shown in Figure 6a and Figure 6b The transmitter circuit 501 of the wireless charging circuit may further include a first series switch 501c.

[0173] The first series switch 501c may include an input terminal, a first output terminal, and a second output terminal.

[0174] After the first series switch 501 c is set in the transmitter circuit 501 , the first series switch 501 c can be set at different positions so that the first series switch 501 c can control whether the first transmitter coil 501 a or the second transmitter coil 501 b is connected to the transmitter circuit 501 .

[0175] Moreover, during the charging process, the first series switch 501c can adopt different connection modes for the transmitting coil controlled by the first series switch 501c, so that the input end of the first series switch 501c is connected to different output ends, thereby controlling whether the transmitting coil is connected to the transmitting circuit 501, so as to adjust the inductance of the transmitting circuit 501 and improve the charging flexibility of the transmitting circuit 501.

[0176] See also Figure 6a In the first connection mode, the first series switch 501c can be connected in series between the first transmitting coil 501a and the second transmitting coil 501b. That is, the input end of the first series switch 501c is connected to the output end of the first transmitting coil 501a, the first output end of the first series switch 501c is connected to the output end of the second transmitting coil 501b, and the second output end of the first series switch 501c is connected to the input end of the second transmitting coil 501b.

[0177] If the input terminal of the first series switch 501c is connected to the first output terminal of the first series switch 501c, the input terminal of the second transmitting coil 501b is left floating, and current cannot flow into the second transmitting coil 501b. Instead, current flows through the input terminal of the first series switch 501c and into the first output terminal of the first series switch 501c. The second transmitting coil 501b is then disconnected from the transmitting circuit 501.

[0178] On the contrary, if the input end of the first series switch 501c is connected to the second output end of the first series switch 501c, current can flow into the input end of the second transmitting coil 501b through the input end of the first series switch 501c and the second output end of the first series switch 501c, and then flow out from the output end of the second transmitting coil 501b, so that the second transmitting coil 501b is connected to the transmitting end circuit 501.

[0179] See also Figure 6b In the second connection mode, the first series switch 501c can also be connected in series between the first transmitting coil 501a and the first output terminal of the inverter circuit 503. That is, the input terminal of the first series switch 501c is connected to the first output terminal of the inverter circuit 503, the first output terminal of the first series switch 501c is connected to the output terminal of the first transmitting coil 501a, and the second output terminal of the first series switch 501c is connected to the input terminal of the first transmitting coil 501a.

[0180] Similar to the process of controlling whether the second transmitting coil 501b is connected to the transmitting circuit 501, if the input end of the first series switch 501c is connected to the first output end of the first series switch 501c, the first transmitting coil 501a is disconnected from the transmitting circuit 501. If the input end of the first series switch 501c is connected to the second output end of the first series switch 501c, the first transmitting coil 501a is connected to the transmitting circuit 501.

[0181] based on Figure 6b The wireless charging circuit shown in Figure 7 The transmitter circuit 501 of the wireless charging circuit may further include a second series switch 501d.

[0182] The second series switch 501d may also include an input terminal, a first output terminal and a second output terminal.

[0183] Similar to the first series switch 501c, the second series switch 501d can also control whether the first transmitting coil 501a or the second transmitting coil 501b is connected to the transmitting circuit 501. Moreover, the second series switch 501d and the first series switch 501c can jointly control the transmitting coil connected to the transmitting circuit 501.

[0184] For example, in the first connection mode, the first series switch 501c can be connected in series between the first transmitting coil 501a and the first output terminal of the inverter circuit 503. The first series switch 501c can then control whether the first transmitting coil 501a is added to the transmitting circuit 501. Correspondingly, the second series switch 501d can be connected in series between the first transmitting coil 501a and the second transmitting coil 501b. The second series switch 501d can then control whether the second transmitting coil 501b is added to the transmitting circuit 501.

[0185] In contrast to the first connection mode, in the second connection mode, the second series switch 501d can be connected in series between the first transmitting coil 501a and the first output terminal of the inverter circuit 503, and the first series switch 501c can be connected in series between the first transmitting coil 501a and the second transmitting coil 501b.

[0186] The present embodiment uses the first connection method as an example. If the first series switch 501c is connected in series between the first transmitting coil 501a and the first output terminal of the inverter circuit 503, the second series switch 501d can be connected in series between the first transmitting coil 501a and the second transmitting coil 501b. That is, the input terminal of the second series switch 501d is connected to the first output terminal of the first series switch 501c, the first output terminal of the second series switch 501d is connected to the output terminal of the second transmitting coil 501b, and the second output terminal of the second series switch 501d is connected to the input terminal of the second transmitting coil 501b.

[0187] During the charging process, the first series switch 501c and the second series switch 501d can respectively adopt different connection modes to control whether the first transmitting coil 501a and the second transmitting coil 501b are connected to the transmitting end circuit 501:

[0188] In the first connection mode, when the input of the first series switch 501c is connected to the second output of the first series switch 501c, the first transmitting coil 501a is connected to the transmitting circuit 501. If the input of the second series switch 501d is connected to the first output of the second series switch 501d, the input of the second transmitting coil 501b is left floating, and no current flows into the second transmitting coil 501b, thus disconnecting the second transmitting coil 501b from the transmitting circuit 501. If the input of the second series switch 501d is connected to the second output of the second series switch 501d, current can flow into the second transmitting coil 501b through the input and second output of the second series switch 501d and the input of the second transmitting coil 501b, and then flow out of the output of the second transmitting coil 501b, thus connecting the second transmitting coil 501b to the transmitting circuit 501.

[0189] In the second connection mode, when the input terminal of the first series switch 501c is connected to the first output terminal of the first series switch 501c, the first transmitting coil 501a is disconnected from the transmitting circuit 501. If the input terminal of the second series switch 501d is connected to the first output terminal of the second series switch 501d, the second transmitting coil 501b is disconnected from the transmitting circuit 501; if the input terminal of the second series switch 501d is connected to the second output terminal of the second series switch 501d, the second transmitting coil 501b is connected to the transmitting circuit 501.

[0190] By controlling the input terminals of the first series switch 501c and the second series switch 501d to be connected to different output terminals, the first transmitting coil 501a and the second transmitting coil 501b can be connected to or separated from the transmitting circuit 501, thereby adjusting the number of transmitting coils in the transmitting circuit 501, and further adjusting the inductance of the transmitting circuit 501, thereby adjusting the charging power and charging speed of the transmitting circuit 501.

[0191] Figure 6a 、 Figure 6b and Figure 7 The present invention shows a transmitter circuit 501 capable of controlling the number of transmitting coils. The circuit can adjust the inductance of the transmitter circuit 501 by controlling the number of transmitting coils connected in series. However, in actual applications, the inductance of the transmitter circuit 501 can also be changed by changing the connection method of the transmitting coils.

[0192] based on Figure 7 The wireless charging circuit shown in Figure 8 The transmitter circuit 501 of the wireless charging circuit may further include a first parallel switch 501e and a second parallel switch 501f.

[0193] The first parallel switch 501e may include a first end and a second end, and the second parallel switch 501f may include an input end, a first output end, and a second output end.

[0194] Specifically, the first parallel switch 501e can be connected in series between the first output terminal of the inverter circuit 503 and the second series switch 501d, and the second parallel switch 501f can be connected in series between the first series switch 501c and the second series switch 501d. For example, the first end of the first parallel switch 501e can be connected to the first output terminal of the inverter circuit 503, and the second end of the first parallel switch 501e can be connected to the second output terminal of the second parallel switch 501f. Moreover, the input end of the second parallel switch 501f can be connected to the first output terminal of the first series switch 501c, the first output end of the second parallel switch 501f can be connected to the second output terminal of the inverter circuit 503, and the second output end of the second parallel switch 501f can be connected to the input end of the second series switch 501d.

[0195] Accordingly, see Figure 8 The first series switch 501c, the second series switch 501d, the first parallel switch 501e and the second parallel switch 501f in the transmitter circuit 501 can be connected in different ways, so that the transmitter circuit 501 forms different circuits.

[0196] The embodiment of the present application is described only by taking the transmitter circuit 501 including the first transmitter coil 501a and the second transmitter coil 501b as an example. The input end of the first series switch 501c is connected to the second output end, and the input end of the second series switch 501d is connected to the second output end. That is, the first transmitter coil 501a and the second transmitter coil 501b are both connected to the transmitter circuit 501. The connection modes of the first transmitter coil 501a and the second transmitter coil 501b in series and in parallel are described as follows:

[0197] In the first connection mode, when the first parallel switch 501e is closed, if the input end of the second parallel switch 501f is connected to the first output end of the second parallel switch 501f, the output end of the first transmitting coil 501a is connected to the second output end of the inverter circuit 503 via the first output end of the second parallel switch 501f, and the output end of the second transmitting coil 501b is also connected to the second output end of the inverter circuit 503. Moreover, the input end of the second transmitting coil 501b is connected to the first output end of the inverter circuit 503 via the first parallel switch 501e, and the input end of the first transmitting coil 501a is also connected to the first output end of the inverter circuit 503. As a result, the first transmitting coil 501a and the second transmitting coil 501b are connected in parallel.

[0198] However, if the input end of the second parallel switch 501f is connected to the second output end of the second parallel switch 501f, the output end of the first transmitting coil 501a is connected to the input end of the second transmitting coil 501b through the second parallel switch 501f and the second series switch 501d, and the input end of the first transmitting coil 501a is connected to the first output end of the inverter circuit 503. The input end of the first parallel switch 501e is connected to the first output end of the inverter circuit 503, and the output end of the first parallel switch 501e is also connected to the input end of the second transmitting coil 501b. In this way, the first transmitting coil 501a is short-circuited by the first parallel switch 501e and is cut out of the transmitting end circuit 501.

[0199] In the second connection mode, when the first parallel switch 501e is disconnected, if the input terminal of the second parallel switch 501f is connected to the first output terminal of the second parallel switch 501f, the output terminal of the first transmitting coil 501a can be connected to the second output terminal of the inverter circuit 503 through the first output terminal of the second parallel switch 501f, and the output terminal of the second transmitting coil 501b is also connected to the second output terminal of the inverter circuit 503. However, the input terminal of the second transmitting coil 501b is left floating, and only the input terminal of the first transmitting coil 501a is connected to the first output terminal of the inverter circuit 503. In this way, the second transmitting coil 501b is disconnected from the transmitting end circuit 501.

[0200] However, if the input end of the second parallel switch 501f is connected to the second output end of the second parallel switch 501f, the output end of the first transmitting coil 501a can be connected to the input end of the second transmitting coil 501b via the second output end of the second parallel switch 501f. The input end of the first transmitting coil 501a can be connected to the first output end of the inverter circuit 503, and the output end of the second transmitting coil 501b can be connected to the second output end of the inverter circuit 503. In this way, the first transmitting coil 501a and the second transmitting coil 501b are connected in series between the first output end and the second output end of the inverter circuit 503.

[0201] The above embodiment is described by taking two transmitting coils as an example. In actual applications, the transmitting end circuit 501 may also include three transmitting coils or more transmitting coils. The embodiment of the present application is described again by taking three transmitting coils as an example. Figure 6a and Figure 6b The wireless charging circuit shown in Figure 9a 、 Figure 9b and Figure 9c The transmitting end circuit 501 of the wireless charging circuit may further include: a third transmitting coil 501g.

[0202] The first transmitting coil 501a, the second transmitting coil 501b and the third transmitting coil 501g are connected in series in sequence.

[0203] Moreover, similar to the wireless charging circuit shown in FIG6 , the first series switch 501 c can be set at different positions of the transmitter circuit 501 to form different connection modes and control whether different transmitter coils are connected to the transmitter circuit 501 .

[0204] See also Figure 9a In the first connection mode, the first series switch 501c can be connected in series between the first transmitting coil 501a and the second transmitting coil 501b. That is, the input end of the first series switch 501c can be connected to the output end of the first transmitting coil 501a, the first output end of the first series switch 501c can be connected to the output end of the second transmitting coil 501b and the input end of the third transmitting coil 501g, respectively, and the second output end of the first series switch 501c can be connected to the input end of the second transmitting coil 501b.

[0205] See also Figure 9bIn the second connection mode, the first series switch 501c can be connected in series between the first transmitting coil 501a and the first output terminal of the inverter circuit 503. That is, the input terminal of the first series switch 501c can be connected to the first output terminal of the inverter circuit 503, the first output terminal of the first series switch 501c can be connected to the output terminal of the first transmitting coil 501a and the input terminal of the second transmitting coil 501b respectively, and the second output terminal of the first series switch 501c can be connected to the input terminal of the first transmitting coil 501a.

[0206] See also Figure 9c In the third connection mode, the first series switch 501c can be connected in series between the second transmitting coil 501b and the third transmitting coil 501g to control whether the third transmitting coil 501g is connected to the transmitting circuit 501. Specifically, the input of the first series switch 501c can be connected to the output of the second transmitting coil 501b, the first output of the first series switch 501c can be connected to the output of the third transmitting coil 501g and the second output of the inverter circuit 503, respectively, and the second output of the first series switch 501c can be connected to the input of the third transmitting coil 501g.

[0207] The first and second connection methods mentioned above are Figure 6a and Figure 6b The transmitter circuit 501 shown controls whether the first transmitter coil 501a and the second transmitter coil 501b are connected to the transmitter circuit 501 in a similar manner, which will not be described in detail here. Figure 9c During the charging process, the first series switch 501c can use different connection modes to control whether the third transmitting coil 501g is connected to the transmitting end circuit 501.

[0208] In the first connection mode, if the input end of the first series switch 501c is connected to the first output end of the first series switch 501c, the input end of the third transmitting coil 501g is left floating, and only the first transmitting coil 501a and the second transmitting coil 501b are connected to the transmitting circuit 501, while the third transmitting coil 501g is disconnected from the transmitting circuit 501.

[0209] In the second connection mode, if the input end of the first series switch 501c is connected to the second output end of the first series switch 501c, the input end of the third transmitting coil 501g is connected to the output end of the second transmitting coil 501b through the first series switch 501c, and the output end of the third transmitting coil 501g is connected to the second output end of the inverter circuit 503. The third transmitting coil 501g is connected to the transmitting end circuit 501.

[0210] based on Figure 9a and Figure 9b The wireless charging circuit shown in Figure 10a 、 Figure 10b and Figure 10c The transmitter circuit 501 of the wireless charging circuit may further include: a second series switch 501d. In this case, the transmitter circuit 501 may include three transmitting coils and two series switches. By adjusting the different positions of the two series switches in the transmitter circuit 501, it is possible to control whether any two transmitting coils in the transmitter circuit 501 are connected to the transmitter circuit 501.

[0211] Among them, Figure 9a 、 Figure 9b and Figure 9c Similar to the wireless charging circuit shown in FIG. 5 , the first series switch 501c can be set at different positions of the transmitter circuit 501, and the second series switch 501d can cooperate with the first series switch 501c to form different connection modes to control whether different transmitting coils are connected to the transmitter circuit 501. The specific connection mode of the first series switch 501c can be referred to as Figure 9a 、 Figure 9b and Figure 9c The transmitter circuit 501 is shown and will not be described in detail here.

[0212] See also Figure 10a In the first connection mode, if the first series switch 501c is connected in series between the first output terminal of the inverter circuit 503 and the first transmitting coil 501a, the second series switch 501d can be connected in series between the first transmitting coil 501a and the second transmitting coil 501b. That is, the input terminal of the second series switch 501d can be connected to the first output terminal of the first series switch 501c, the first output terminal of the second series switch 501d can be connected to the output terminal of the second transmitting coil 501b and the input terminal of the third transmitting coil 501g, respectively, and the second output terminal of the second series switch 501d can be connected to the input terminal of the second transmitting coil 501b.

[0213] See also Figure 10b In the second connection mode, if the first series switch 501c is connected in series between the first output terminal of the inverter circuit 503 and the first transmitting coil 501a, the second series switch 501d can be connected in series between the second transmitting coil 501b and the third transmitting coil 501g. That is, the input terminal of the second series switch 501d can be connected to the output terminal of the second transmitting coil 501b, the first output terminal of the second series switch 501d can be connected to the output terminal of the third transmitting coil 501g and the second output terminal of the inverter circuit 503, respectively, and the second output terminal of the second series switch 501d can be connected to the input terminal of the third transmitting coil 501g.

[0214] See also Figure 10c In the third connection mode, if the first series switch 501c is connected in series between the first transmitting coil 501a and the second transmitting coil 501b, then the second series switch 501d is connected in series between the second transmitting coil 501b and the third transmitting coil 501g. That is, the input terminal of the second series switch 501d can be connected to the first output terminal of the first series switch 501c, the first output terminal of the second series switch 501d can be connected to the output terminal of the third transmitting coil 501g and the second output terminal of the inverter circuit 503, respectively, and the second output terminal of the second series switch 501d can be connected to the input terminal of the third transmitting coil 501g.

[0215] In the case of the first connection method, see Figure 10a If the input end of the second series switch 501d is connected to the first output end of the second series switch 501d, the input end of the second transmitting coil 501b is suspended, and the second transmitting coil 501b is cut out of the transmitting end circuit 501.

[0216] However, if the input end of the second series switch 501d is connected to the second output end of the second series switch 501d, the input end of the second transmitting coil 501b can be connected in series with the first transmitting coil 501a connected to the transmitting circuit 501 through the second series switch 501d. Alternatively, when the first transmitting coil 501a is disconnected from the transmitting circuit 501, the input end of the second transmitting coil 501b can be connected to the first series switch 501c through the second series switch 501d, so that the second transmitting coil 501b is connected to the transmitting circuit 501.

[0217] In case of the second connection method, see Figure 10b If the input end of the second series switch 501d is connected to the first output end of the second series switch 501d, the input end of the third transmitting coil 501g is suspended, and the third transmitting coil 501g is cut out of the transmitting end circuit 501.

[0218] However, if the input end of the second series switch 501d is connected to the second output end of the first series switch 501c, the input end of the third transmitting coil 501g can be connected in series with the second transmitting coil 501b connected to the transmitting circuit 501 through the second series switch 501d, and the third transmitting coil 501g is connected to the transmitting circuit 501.

[0219] In case of the third connection method, see Figure 10c If the input end of the second series switch 501d is connected to the first output end of the first series switch 501c, the input end of the third transmitting coil 501g is suspended, and the third transmitting coil 501g is cut out of the transmitting end circuit 501.

[0220] However, if the input end of the second series switch 501d is connected to the second output end of the first series switch 501c, the input end of the third transmitting coil 501g can be connected in series with the second transmitting coil 501b connected to the transmitting circuit 501 through the second series switch 501d. Alternatively, when the second transmitting coil 501b is disconnected from the transmitting circuit 501, the input end of the third transmitting coil 501g can be connected to the first transmitting coil 501a through the second series switch 501d, so that the third transmitting coil 501g is connected to the transmitting circuit 501.

[0221] It should be noted that if Figure 10a 、 Figure 10b and Figure 10c In the transmitter circuit 501 shown, the positions of the first series switch 501c and the second series switch 501d can be interchanged. That is, the first series switch 501c is set at the position of the second series switch 501d, and the second series switch 501d is set at the position of the first series switch 501c. The charging process after the positions of the first series switch 501c and the second series switch 501d are interchanged is similar to the above charging process and will not be repeated here.

[0222] based on Figure 10a The wireless charging circuit shown in Figure 11 The transmitter circuit 501 of the wireless charging circuit may further include a third series switch 501h, which may also include an input terminal, a first output terminal, and a second output terminal. In this case, the transmitter circuit 501 may include three transmitting coils and three series switches, each corresponding to a series switch. Whether each transmitting coil is connected to the transmitter circuit 501 may be adjusted based on the connectivity of the corresponding series switch.

[0223] exist Figure 10a In the embodiment, the first series switch 501c is connected in series between the first transmitting coil 501a and the second transmitting coil 501b, and the second series switch 501d is connected in series between the first transmitting coil 501a and the second transmitting coil 501b. Then, the third series switch 501h can be connected in series between the second transmitting coil 501b and the third transmitting coil 501g.

[0224] The input end of the third series switch 501h can be connected to the first output end of the second series switch 501d, the first output end of the third series switch 501h can be connected to the output end of the third transmitting coil 501g and the second output end of the inverter circuit 503 respectively, and the second output end of the third series switch 501h can be connected to the input end of the third transmitting coil 501g. The specific connection method of the first series switch 501c and the second series switch 501d can be referred to as follows. Figure 10aThe transmitter circuit 501 is shown and will not be described in detail here.

[0225] During charging, if the input of the third series switch 501h is connected to the first output of the third series switch 501h, the input of the third transmitting coil 501g is left floating, and the third transmitting coil 501g is disconnected from the transmitter circuit 501. However, if the input of the third series switch 501h is connected to the second output of the third series switch 501h, the input of the third transmitting coil 501g can be connected to the first series switch 501c, the second series switch 501d, or the first output of the inverter circuit 503 via the third series switch 501h, thereby connecting the third transmitting coil 501g to the transmitter circuit 501.

[0226] Whether the first transmitting coil 501a and the second transmitting coil 501b are connected to the transmitting end circuit 501 can be referred to Figure 10a The transmitter circuit 501 is shown and will not be described in detail here.

[0227] It should be noted that if Figure 11 In the illustrated transmitter circuit 501, the positions of the first series switch 501c, the second series switch 501d, and the third series switch 501h can be interchanged. For example, the first series switch 501c can be positioned at the position of the second series switch 501d, the second series switch 501d can be positioned at the position of the third series switch 501h, and the third series switch 501h can be positioned at the position of the first series switch 501c. The charging process after the positions of the first series switch 501c, the second series switch 501d, and the third series switch 501h are interchanged is similar to the above-described charging process and will not be further described here.

[0228] based on Figure 11 The wireless charging circuit shown in Figure 12a and 12b The transmitter circuit 501 of the wireless charging circuit may further include: a first parallel switch 501e and a second parallel switch 501f. The first parallel switch 501e may include a first end and a second end. The second parallel switch 501f may include an input end, a first output end, and a second output end.

[0229] and Figure 8 The transmitter circuit 501 shown is similar to that shown in FIG. Figure 11 The transmitter circuit 501 shown in the figure includes a first parallel switch 501e and a second parallel switch 501f. This allows the connection mode of the transmitter circuit 501 to be changed by changing the series-parallel connection mode between the transmitter coils, thereby adjusting the inductance of the transmitter circuit 501 and improving the charging power and efficiency of the transmitter circuit 501.

[0230] In the transmitter circuit 501, the second parallel switch 501f can be set at different positions to form different connection modes, thereby obtaining different transmitter circuits 501. For example, the first transmitter coil 501a can be connected in parallel with the second transmitter coil 501b and the third transmitter coil 501g connected in series, or the third transmitter coil 501g can be connected in parallel with the first transmitter coil 501a and the second transmitter coil 501b connected in series.

[0231] In a first connection mode, the first parallel switch 501e can be connected in series between the second series switch 501d and the first output terminal of the inverter circuit 503, and the second parallel switch 501f can be connected in series between the first series switch 501c and the second series switch 501d. In a second connection mode, the first parallel switch 501e can be connected in series between the third series switch 501h and the first output terminal of the inverter circuit 503, and the second parallel switch 501f can be connected in series between the second series switch 501d and the third series switch 501h.

[0232] Specifically, the first end of the first parallel switch 501e can be connected to the first output end of the inverter circuit 503, the second end of the first parallel switch 501e can be connected to the second output end of the second parallel switch 501f, and the first output end of the second parallel switch 501f can be connected to the second output end of the inverter circuit 503.

[0233] Corresponding to the first connection method, see Figure 12a The input end of the second parallel switch 501f can be connected to the first output end of the first series switch 501c, the second output end of the second parallel switch 501f can be connected to the input end of the second series switch 501d, and the second transmitting coil 501b is connected in series with the third transmitting coil 501g.

[0234] In the case of the first connection method, if Figure 12aAs shown, when the first parallel switch 501e is closed, if the input of the second parallel switch 501f is connected to the first output of the second parallel switch 501f, the input of the first transmitting coil 501a and the input of the second transmitting coil 501b are both connected to the first output of the inverter circuit 503, the output of the first transmitting coil 501a is connected to the second output of the inverter circuit 503, the second transmitting coil 501b is connected in series with the third transmitting coil 501g, and the output of the third transmitting coil 501g is also connected to the second output of the inverter circuit 503. Therefore, the first transmitting coil 501a can be connected in parallel with the second transmitting coil 501b and the third transmitting coil 501g connected in series. However, if the input of the second parallel switch 501f is connected to the second output of the second parallel switch 501f, the first transmitting coil 501a is short-circuited and disconnected from the transmitting circuit 501.

[0235] When the first parallel switch 501e is disconnected, if the input end of the second parallel switch 501f is connected to the second output end of the second parallel switch 501f, the input end of the second transmitting coil 501b is connected to the output end of the first transmitting coil 501a through the second parallel switch 501f, and the first transmitting coil 501a can be connected in series with the second transmitting coil 501b and the third transmitting coil 501g.

[0236] However, if the input terminal of the second parallel switch 501f is connected to the first output terminal of the second parallel switch 501f, the second output terminal of the second parallel switch 501f is left floating, and the current in the transmitter circuit 501 cannot flow into the second transmitter coil 501b through the second parallel switch 501f. Furthermore, if the first parallel switch 501e is disconnected, the current in the transmitter circuit 501 cannot flow into the second transmitter coil 501b through the first parallel switch 501e. As a result, the input terminal of the second transmitter coil 501b is left floating, and the third transmitter coil 501g is connected in series with the second transmitter coil 501b. The second transmitter coil 501b and the third transmitter coil 501g are cut out of the transmitter circuit 501.

[0237] For the second connection method, see Figure 12b The input end of the second parallel switch 501f can be connected to the first output end of the second series switch 501d, the second output end of the second parallel switch 501f can be connected to the input end of the third series switch 501h, and the first transmitting coil 501a and the second transmitting coil 501b are connected in series.

[0238] In the case of the second connection method, such as Figure 12bAs shown, when the first parallel switch 501e is closed, if the input terminal of the second parallel switch 501f is connected to the first output terminal of the second parallel switch 501f, the output terminal of the second transmitting coil 501b can be connected to the second output terminal of the inverter circuit 503 through the second parallel switch 501f, and the output terminal of the third transmitting coil 501g is also connected to the second output terminal of the inverter circuit 503. The input terminal of the third transmitting coil 501g is connected to the first output terminal of the inverter circuit 503 through the first parallel switch 501e. If the first transmitting coil 501a and the second transmitting coil 501b are connected in series, the input terminal of the first transmitting coil 501a is also connected to the first output terminal of the inverter circuit 503. The third transmitting coil 501g is connected in parallel with the second transmitting coil 501b. That is, the third transmitting coil 501g is connected in parallel with the first transmitting coil 501a and the second transmitting coil 501b connected in series. However, if the input end of the second parallel switch 501f is connected to the second output end of the second parallel switch 501f, the first transmitting coil 501a and the second transmitting coil 501b are short-circuited by the closed first parallel switch 501e, and the first transmitting coil 501a and the second transmitting coil 501b are cut out of the transmitting end circuit 501.

[0239] When the first parallel switch 501e is disconnected, if the input of the second parallel switch 501f is connected to the second output of the second parallel switch 501f, the input of the third transmitting coil 501g is connected to the output of the second transmitting coil 501b via the second parallel switch 501f, and the second transmitting coil 501b and the third transmitting coil 501g are connected in series. However, if the input of the second parallel switch 501f is connected to the first output of the second parallel switch 501f, the second output of the second parallel switch 501f is left floating, and the current in the transmitting circuit 501 cannot flow through the second parallel switch 501f into the third transmitting coil 501g. Furthermore, when the first parallel switch 501e is disconnected, the current in the transmitting circuit 501 cannot flow through the first parallel switch 501e into the third transmitting coil 501g. Consequently, the input of the third transmitting coil 501g is left floating, and the third transmitting coil 501g is disconnected from the transmitting circuit 501.

[0240] It should be noted that the above description is based on the example of three transmitting coils connected to the transmitting end circuit 501 through corresponding series switches. The process of controlling the transmitting coils through the series switches can be referred to. Figure 11 The corresponding circuit will not be described in detail here.

[0241] based on Figure 12a The wireless charging circuit shown in Figure 13The transmitter circuit 501 of the wireless charging circuit may further include: a third parallel switch 501i and a fourth parallel switch 501j. The third parallel switch 501i may include a first terminal and a second terminal, and the fourth parallel switch 501j may include an input terminal, a first output terminal, and a second output terminal.

[0242] exist Figure 12a The transmitter circuit 501 shown in FIG. 5 shows that the first transmitting coil 501a or the third transmitting coil 501g is connected in parallel with other transmitting coils through the first parallel switch 501e and the second parallel switch 501f. Figure 13 In the transmitter circuit 501 shown, two parallel switches may be added so that each transmitter coil of the transmitter circuit 501 can be connected in parallel.

[0243] Specifically, the first end of the first parallel switch 501e and the first end of the third parallel switch 501i can both be connected to the first output end of the inverter circuit 503, the second end of the first parallel switch 501e can be connected to the second output end of the second parallel switch 501f, the second end of the third parallel switch 501i can be connected to the second output end of the fourth parallel switch 501j, and the first output end of the second parallel switch 501f and the first output end of the fourth parallel switch 501j can both be connected to the second output end of the inverter circuit 503.

[0244] Furthermore, the input terminal of the second parallel switch 501f can be connected to the first output terminal of the first series switch 501c, and the second output terminal of the second parallel switch 501f can be connected to the input terminal of the second series switch 501d. Similarly, the input terminal of the fourth parallel switch 501j can be connected to the first output terminal of the second series switch 501d, and the second output terminal of the fourth parallel switch 501j can be connected to the input terminal of the third series switch 501h.

[0245] If the first parallel switch 501e is connected in series between the second series switch 501d and the first output end of the inverter circuit 503, and the second parallel switch 501f is connected in series between the first series switch 501c and the second series switch 501d, then the third parallel switch 501i is connected in series between the third series switch 501h and the first output end of the inverter circuit 503, and the fourth parallel switch 501j is connected in series between the second series switch 501d and the third series switch 501h.

[0246] When the third parallel switch 501i is closed, if the input terminal of the fourth parallel switch 501j is connected to the first output terminal of the fourth parallel switch 501j, the first transmitting coil 501a and / or the second transmitting coil 501b are connected in parallel with the third transmitting coil 501g. If the input terminal of the fourth parallel switch 501j is connected to the second output terminal of the fourth parallel switch 501j, the first transmitting coil 501a and the second transmitting coil 501b are cut out of the transmitting end circuit 501.

[0247] When the third parallel switch 501i is disconnected, if the input terminal of the fourth parallel switch 501j is connected to the second output terminal of the fourth parallel switch 501j, the first transmitting coil 501a and / or the second transmitting coil 501b are connected in series with the third transmitting coil 501g. If the input terminal of the fourth parallel switch 501j is connected to the first output terminal of the fourth parallel switch 501j, the third transmitting coil 501g is cut out of the transmitting end circuit 501.

[0248] For example, see Table 1, as shown in Table 1 below, Figure 13 The switches in the transmitter circuit 501 shown can be in different states, allowing the transmitter coils to be connected in different connection methods, thereby forming different transmitter circuits 501. This can improve the wireless transmission power in the parallel-connected transmitter circuits 501 and increase the maximum current carrying capacity of the entire coil, that is, increase the maximum current carrying capacity of the transmitter circuit 501. See Table 1, which shows circuit connection methods of three transmitter coils in series, parallel, partial series, and partial parallel connection.

[0249] Table 1

[0250]

[0251] It should be noted that Table 1 is only used as an example to illustrate that each transmitting coil is connected to the transmitting end circuit 501. If there is a transmitting coil separated from the transmitting end circuit 501, you can refer to Figures 6a to 12b Any circuit shown will not be described in detail here.

[0252] In addition, the embodiments of the present application are described using only two or three transmitting coils as examples, but in actual applications, multiple transmitting coils, multiple series switches, and multiple parallel switches can all be connected in the above manner. Figure 14a , Figure 14a A transmitter circuit 501 is shown including four transmitter coils (A, B, C, and D) and four series switches (1, 2, 3, and 4).

[0253] When each series switch is closed, the input end of each series switch can be controlled to be connected to the first output end or the second output end, thereby controlling each transmitting coil to be connected to or separated from the transmitting end circuit 501. For example, series switch 1 can control whether transmitting coil A is connected to the transmitting end circuit 501.

[0254] Furthermore, during maintenance of the wireless charging circuit, the connection mode of each series switch can be controlled to determine whether each transmitting coil is faulty. If a transmitting coil is determined to be faulty, the transmitting coil can be separated from the transmitting end circuit 501. This allows for rapid fault location, improving fault location efficiency.

[0255] For example, in Figure 14a During the testing of each transmitting coil, transmitting coil A can be connected to the transmitting circuit 501 and transmitting coils B, C, and D can be disconnected from the transmitting circuit 501. This allows the voltage across the receiving circuit to be tested to see if it matches a preset standard voltage. If the voltages match, transmitting coil A is not faulty. If the voltages do not match, transmitting coil A is faulty, and series switch 1 can be controlled to disconnect transmitting coil A from the transmitting circuit 501. Similarly, the above method can be used to determine if transmitting coils B, C, and D are faulty, thereby completing maintenance on each transmitting coil.

[0256] Further, in Figure 14a On the basis of the transmitter circuit 501 shown in FIG. 1 , a first parallel switch (5) and a second parallel switch (6) can be added to obtain the following: Figure 14b The transmitter circuit 501 is shown.

[0257] If the first parallel switch 5 is closed and the input end of the second parallel switch 6 is connected to the first output end, the transmitting coils A and / or B can be connected in parallel with the transmitting coils C and / or D; if the first parallel switch 5 is open and the input end of the second parallel switch 6 is connected to the second output end, the transmitting coils A, B, C, and D can be connected in series.

[0258] The above description is based on the example of setting the first parallel switch and the second parallel switch. However, more parallel switches can be set in the transmitter circuit 501 to control more transmitting coils to be connected in series or in parallel to the transmitter circuit 501. The embodiment of the present application does not limit the number of transmitting coils, series switches, and parallel switches.

[0259] In summary, the wireless charging circuit provided in the embodiments of the present application comprises a rectifier circuit, an inverter circuit connected to the output of the rectifier circuit, and a transmitter circuit connected to the output of the inverter circuit. Furthermore, the transmitter circuit comprises first and second transmitting coils connected in series, each of which includes a cylindrical magnetic core and a wire wound around the cylindrical magnetic core. Without compromising charging performance, the wireless charging circuit, based on the compactness and flexibility of the first and second transmitting coils, can adapt to narrow or irregular spaces. This reduces assembly space requirements, improves assembly flexibility and adaptability, and provides greater design space for a thin, lightweight, and compact device.

[0260] Furthermore, by providing series switches in the transmitter circuit, the number of transmitter coils connected to the transmitter circuit can be controlled, thereby adjusting the inductance of the transmitter circuit. This allows the transmission power of the transmitter circuit to be varied according to the varying inductance, thereby improving the transmission power of the transmitter circuit. Furthermore, each series switch can be used to identify a faulty transmitter coil in the transmitter circuit and isolate it from the transmitter circuit, reducing maintenance costs for the transmitter circuit.

[0261] Furthermore, by further providing parallel switches in the transmitter circuit and controlling the coordinated on and off functions of the series switches and the parallel switches, the connection mode of the transmitter coils in the transmitter circuit can be changed. Thus, the inductance of the transmitter circuit can be adjusted based on the changed connection mode of the transmitter coils. This improves the wireless transmission power in the parallel-connected transmitter circuits and increases the maximum current carrying capacity of the coils as a whole. This, in turn, increases the maximum current carrying capacity of the transmitter circuit, thereby improving the transmission power of the transmitter circuit.

[0262] In addition, by providing protruding structures at both ends of the magnetic core, the magnetic lines of force of the magnetic core can be guided and gathered through the protruding structures, thereby improving the conversion rate of the wireless charging circuit.

[0263] The above embodiment introduces a wireless charging circuit based on the transmitting coils connected in series in the transmitting circuit. However, in actual applications, other connection methods can be used to set up the transmitting circuit. The following embodiment introduces another wireless charging circuit by connecting the transmitting coils in parallel.

[0264] Figure 15 This is a structural block diagram of another wireless charging circuit provided by an embodiment of the present application. For ease of explanation, only the parts related to the embodiment of the present application are shown. Figure 15 As shown, the wireless charging circuit may include: a transmitter circuit 1501 , a rectifier circuit 1502 and an inverter circuit 1503 .

[0265] The output of rectifier circuit 1502 is connected to the input of inverter circuit 1503, and the output of inverter circuit 1503 is connected to transmitter circuit 1501. Transmitter circuit 1501 may include a first transmitting coil 1501a and a second transmitting coil 1501b, which are connected in parallel. Furthermore, the output of inverter circuit 1503 may include a first output terminal and a second output terminal.

[0266] For example, see Figure 15 The input end of the first transmitting coil 1501a and the input end of the second transmitting coil 1501b are both connected to the first output end of the inverter circuit 1503, and the output end of the first transmitting coil 1501a and the output end of the second transmitting coil 1501b are both connected to the second output end of the inverter circuit 1503. The first transmitting coil 1501a and the second transmitting coil 1501b are connected in parallel. This can reduce the inductive reactance of the transmitting circuit 1501, increase the maximum current that can flow through the transmitting circuit 1501, and thereby improve the charging conversion rate of the wireless charging circuit.

[0267] In addition, the transmitting coils in the above embodiments may include a cylindrical magnetic core and a wire wound around the cylindrical magnetic core, wherein protrusion structures are provided at both ends of the cylindrical magnetic core, and the protrusion structures are used to guide and gather the magnetic lines of force of the magnetic core, and the wire is wound between the two protrusion structures of the cylindrical magnetic core.

[0268] The charging process of the transmitter circuit 1501 is similar to Figure 5 The charging process of the transmitter circuit shown is similar and will not be repeated here.

[0269] based on Figure 15 The wireless charging circuit shown in Figure 16a and 16b The transmitter circuit 1501 of the wireless charging circuit may further include: a first parallel switch 1501c. The first parallel switch 1501c may include a first end and a second end.

[0270] In the transmitter circuit 1501, the first parallel switch 1501c is disposed between the first transmitting coil 1501a and the first output terminal or the second output terminal of the inverter circuit 1503, or between the second transmitting coil 1501b and the first output terminal or the second output terminal of the inverter circuit 1503. This can control whether the first transmitting coil 1501a or the second transmitting coil 1501b is connected in parallel to the transmitter circuit 1501.

[0271] Specifically, the first end of the first parallel switch 1501c can be connected to the first output end of the inverter circuit 1503, and the second end of the first parallel switch 1501c can be connected to the input end of the first transmitting coil 1501a or the input end of the second transmitting coil 1501b; alternatively, the first end of the first parallel switch 1501c can be connected to the second output end of the inverter circuit 1503, and the second end of the first parallel switch 1501c can be connected to the output end of the first transmitting coil 1501a or the output end of the second transmitting coil 1501b.

[0272] like Figure 16a As shown, first parallel switch 1501c is connected in series between the first output terminal of inverter circuit 1503 and first transmitting coil 1501a. If first parallel switch 1501c is closed, the input terminal of first transmitting coil 1501a is connected to the first output terminal of inverter circuit 1503 via first parallel switch 1501c, and first transmitting coil 1501a is connected in parallel to transmitting circuit 1501. However, if first parallel switch 1501c is open, the input terminal of first transmitting coil 1501a is left floating, and first transmitting coil 1501a is disconnected from transmitting circuit 1501.

[0273] like Figure 16b As shown, first parallel switch 1501c is connected in series between the first output terminal of inverter circuit 1503 and second transmitting coil 1501b. If first parallel switch 1501c is closed, the input terminal of second transmitting coil 1501b is connected to the first output terminal of inverter circuit 1503 via first parallel switch 1501c, and second transmitting coil 1501b is connected in parallel to transmitting circuit 1501. However, if first parallel switch 1501c is open, the input terminal of second transmitting coil 1501b is left floating, and second transmitting coil 1501b is disconnected from transmitting circuit 1501.

[0274] It should be noted that the first parallel switch 1501c is provided between the first transmitting coil 1501a and the second output end of the inverter circuit 1503, and between the second transmitting coil 1501b and the second output end of the inverter circuit 1503. The corresponding transmitting-end circuit 1501 is similar to the transmitting-end circuit 1501 in which the first parallel switch 1501c is provided between the first transmitting coil 1501a and the first output end of the inverter circuit 1503, and between the second transmitting coil 1501b and the first output end of the inverter circuit 1503. Therefore, detailed description thereof is omitted here.

[0275] based on Figure 16a The wireless charging circuit shown in Figure 17 The transmitter circuit 1501 of the wireless charging circuit may further include: a second parallel switch 1501d, the second parallel switch 1501d including a first end and a second end.

[0276] In such Figure 16a In the transmitter circuit 1501 shown in FIG. 1 , only one parallel switch can be used to control whether a transmitter coil is connected to the transmitter circuit 1501. Another parallel switch can be added to the transmitter circuit 1501 to obtain the following: Figure 17 The transmitter circuit 1501 shown can control whether the first transmitter coil 1501a and the second transmitter coil 1501b are connected to the transmitter circuit 1501 through two parallel switches.

[0277] Specifically, the first end of the first parallel switch 1501c and the first end of the second parallel switch 1501d can both be connected to the first output end of the inverter circuit 1503, the second end of the first parallel switch 1501c can be connected to the input end of the first transmitting coil 1501a, and the second end of the second parallel switch 1501d can be connected to the input end of the second transmitting coil 1501b.

[0278] Alternatively, the first end of the first parallel switch 1501c and the first end of the second parallel switch 1501d can both be connected to the second output end of the inverter circuit 1503, the second end of the first parallel switch 1501c can be connected to the output end of the first transmitting coil 1501a, and the second end of the second parallel switch 1501d can be connected to the output end of the second transmitting coil 1501b.

[0279] like Figure 17 As shown, a first parallel switch 1501c can be connected in series between the first output terminal of the inverter circuit 1503 and the first transmitting coil 1501a, and a second parallel switch 1501d can be connected in series between the first output terminal of the inverter circuit 1503 and the second transmitting coil 1501b. If the second parallel switch 1501d is closed, the input terminal of the second transmitting coil 1501b is connected to the first output terminal of the inverter circuit 1503 via the second parallel switch 1501d, and the second transmitting coil 1501b is connected in parallel to the transmitting circuit 1501. However, if the second parallel switch 1501d is open, the input terminal of the second transmitting coil 1501b is left floating, and the second transmitting coil 1501b is disconnected from the transmitting circuit 1501.

[0280] based on Figure 16b The wireless charging circuit shown in Figure 18 The transmitter circuit 1501 of the wireless charging circuit may further include: a third parallel switch 1501e, a first series switch 1501f, and a second series switch 1501g. The third parallel switch 1501e, the first series switch 1501f, and the second series switch 1501g may each include an input terminal, a first output terminal, and a second output terminal.

[0281] Specifically, the first series switch 1501f is connected in series between the first output terminal of the inverter circuit 1503 and the first transmitting coil 1501a, the third parallel switch 1501e and the second series switch 1501g are connected in series between the first transmitting coil 1501a and the second transmitting coil 1501b, and the first parallel switch 1501c is connected in series between the first output terminal of the inverter circuit 1503 and the second series switch 1501g.

[0282] If the input end of the first series switch 1501f is connected to the first output end of the first series switch 1501f, the first transmitting coil 1501a is cut out of the transmitting end circuit 1501. If the input end of the first series switch 1501f is connected to the second output end of the first series switch 1501f, the first transmitting coil 1501a is connected to the transmitting end circuit 1501.

[0283] If the input end of the second series switch 1501g is connected to the first output end of the second series switch 1501g, the second transmitting coil 1501b is cut out of the transmitting end circuit 1501. If the input end of the second series switch 1501g is connected to the second output end of the second series switch 1501g, the second transmitting coil 1501b is connected to the transmitting end circuit 1501.

[0284] When the first parallel switch 1501c is closed, if the input terminal of the third parallel switch 1501e is connected to the first output terminal of the third parallel switch 1501e, the second transmitting coil 1501b is connected in parallel to the transmitting circuit 1501. If the input terminal of the third parallel switch 1501e is connected to the second output terminal of the third parallel switch 1501e, the first transmitting coil 1501a is disconnected from the transmitting circuit 1501.

[0285] When the first parallel switch 1501c is disconnected, if the input terminal of the third parallel switch 1501e is connected to the first output terminal of the third parallel switch 1501e, the second transmitting coil 1501b is cut out of the transmitting end circuit 1501. If the input terminal of the third parallel switch 1501e is connected to the second output terminal of the third parallel switch 1501e, the second transmitting coil 1501b is connected in series with the transmitting end circuit 1501.

[0286] like Figure 18 The transmitter circuit 1501 shown in FIG. Figure 8 The transmitter circuit 1501 shown is similar and will not be described again here.

[0287] based on Figure 16a and 16b The wireless charging circuit shown in Figure 19 The transmitting end circuit 1501 of the wireless charging circuit may further include: a third transmitting coil 1501h.

[0288] The first transmitting coil 1501a, the second transmitting coil 1501b and the third transmitting coil 1501h are connected in parallel. The process of controlling the first transmitting coil 1501a or the second transmitting coil 1501b to be added to or cut out of the transmitting end circuit 1501 by the first parallel switch 1501c can be referred to as follows: Figure 16a and 16b The corresponding transmitter circuit 1501 is as follows: Figure 19 The transmitter circuit 1501 shown only introduces how to control the third transmitter coil 1501h to be added into or cut out of the transmitter circuit 1501 through the first parallel switch 1501c.

[0289] Specifically, the first end of the first parallel switch 1501c can be connected to the first output end of the inverter circuit 1503, and the second end of the first parallel switch 1501c can be connected to the input end of the first transmitting coil 1501a, the input end of the second transmitting coil 1501b, or the input end of the third transmitting coil 1501h; alternatively, the first end of the first parallel switch 1501c can be connected to the second output end of the inverter circuit 1503, and the second end of the first parallel switch 1501c can be connected to the output end of the first transmitting coil 1501a, the output end of the second transmitting coil 1501b, or the output end of the third transmitting coil 1501h.

[0290] See also Figure 19 , shows a transmitter circuit 1501 in which a first parallel switch 1501c is connected in series between the first output terminal of the inverter circuit 1503 and the third transmitting coil 1501h. During charging, if the first parallel switch 1501c is closed, the input terminal of the third transmitting coil 1501h is connected to the first output terminal of the inverter circuit 1503 via the first parallel switch 1501c, and the third transmitting coil 1501h is connected in parallel to the transmitter circuit 1501. However, if the first parallel switch 1501c is open, the input terminal of the third transmitting coil 1501h is left floating, and the third transmitting coil 1501h is disconnected from the transmitter circuit 1501.

[0291] based on Figure 19 The wireless charging circuit shown in Figure 20a 、 20b and 20c, the transmitter circuit 1501 of the wireless charging circuit may further include: a second parallel switch 1501d.

[0292] The second parallel switch 1501d can be connected with Figure 19 The first parallel switch 1501c shown cooperates to control any two transmitting coils among the three transmitting coils to be connected to or cut out of the transmitting end circuit 1501.

[0293] Specifically, the first end of the first parallel switch 1501c and the first end of the second parallel switch 1501d can both be connected to the first output end of the inverter circuit 1503. If the second end of the first parallel switch 1501c is connected to the input end of the first transmitting coil 1501a, the second end of the second parallel switch 1501d can be connected to the input end of the second transmitting coil 1501b or the input end of the third transmitting coil 1501h. If the second end of the first parallel switch 1501c is connected to the input end of the second transmitting coil 1501b, the second end of the second parallel switch 1501d can be connected to the input end of the third transmitting coil 1501h.

[0294] Alternatively, the first end of the first parallel switch 1501c and the first end of the second parallel switch 1501d can both be connected to the second output end of the inverter circuit 1503. If the second end of the first parallel switch 1501c is connected to the output end of the first transmitting coil 1501a, the second end of the second parallel switch 1501d can be connected to the output end of the second transmitting coil 1501b or the output end of the third transmitting coil 1501h. If the second end of the first parallel switch 1501c is connected to the output end of the second transmitting coil 1501b, the second end of the second parallel switch 1501d can be connected to the output end of the third transmitting coil 1501h.

[0295] For example, see Figure 20a If the first parallel switch 1501c is connected in series between the first output terminal of the inverter circuit 1503 and the first transmitting coil 1501a, the second parallel switch 1501d can be connected in series between the first output terminal of the inverter circuit 1503 and the second transmitting coil 1501b. If the second parallel switch 1501d is closed, the input terminal of the second transmitting coil 1501b can be connected to the first output terminal of the inverter circuit 1503 via the second parallel switch 1501d, and the second transmitting coil 1501b is connected in parallel to the transmitting circuit 1501. However, if the second parallel switch 1501d is open, the input terminal of the second transmitting coil 1501b is left floating, and the second transmitting coil 1501b is disconnected from the transmitting circuit 1501.

[0296] Alternatively, see Figure 20b If first parallel switch 1501c is connected in series between the first output terminal of inverter circuit 1503 and first transmitting coil 1501a, second parallel switch 1501d can also be connected in series between the first output terminal of inverter circuit 1503 and third transmitting coil 1501h. Similar to the process of controlling second transmitting coil 1501b, if second parallel switch 1501d is closed, third transmitting coil 1501h is connected in parallel to transmitting circuit 1501. If second parallel switch 1501d is open, third transmitting coil 1501h is disconnected from transmitting circuit 1501.

[0297] Or, see Figure 20c If first parallel switch 1501c is connected in series between the first output terminal of inverter circuit 1503 and second transmitting coil 1501b, then second parallel switch 1501d can be connected in series between the first output terminal of inverter circuit 1503 and third transmitting coil 1501h. If second parallel switch 1501d is closed, third transmitting coil 1501h is connected in parallel to transmitting circuit 1501. If second parallel switch 1501d is open, third transmitting coil 1501h is disconnected from transmitting circuit 1501.

[0298] It should be noted that if Figure 20a 、 Figure 20b and Figure 20c In the transmitter circuit 1501 shown, the positions of the first parallel switch 1501c and the second parallel switch 1501d can be interchanged, that is, the first parallel switch 1501c is set at the position of the second parallel switch 1501d, and the second parallel switch 1501d is set at the position of the first parallel switch 1501c. The charging process after the positions of the first parallel switch 1501c and the second parallel switch 1501d are interchanged is similar to the above charging process and will not be repeated here.

[0299] based on Figure 20a The wireless charging circuit shown in Figure 21 The transmitter circuit 1501 of the wireless charging circuit may further include: a fourth parallel switch 1501i, wherein the fourth parallel switch 1501i may include a first end and a second end.

[0300] Based on Figure 20a The transmitter circuit 1501 shown in FIG. 1 can further be added with a parallel switch to enable each transmitter coil in the transmitter circuit 1501 to be controlled by the parallel switch to be connected to the transmitter circuit 1501. Figure 20a In the embodiment, the first parallel switch 1501c is connected in series between the first output terminal of the inverter circuit 1503 and the first transmitting coil 1501a, and the second parallel switch 1501d is connected in series between the first output terminal of the inverter circuit 1503 and the second transmitting coil 1501b. Figure 21 In the embodiment, the fourth parallel switch 1501i can be connected in series between the first output terminal of the inverter circuit 1503 and the third transmitting coil 1501h.

[0301] For example, the fourth parallel switch 1501i may include a first end and a second end. The first end of the first parallel switch 1501c, the first end of the second parallel switch 1501d, and the first end of the fourth parallel switch 1501i are all connected to the first output end of the inverter circuit 1503. The second end of the first parallel switch 1501c is connected to the input end of the first transmitting coil 1501a. The second end of the second parallel switch 1501d is connected to the input end of the second transmitting coil 1501b. The second end of the fourth parallel switch 1501i is connected to the input end of the third transmitting coil 1501h.

[0302] Alternatively, the first end of the first parallel switch 1501c, the first end of the second parallel switch 1501d, and the first end of the fourth parallel switch 1501i are all connected to the second output end of the inverter circuit 1503, the second end of the first parallel switch 1501c is connected to the output end of the first transmitting coil 1501a, the second end of the second parallel switch 1501d is connected to the output end of the second transmitting coil 1501b, and the second end of the fourth parallel switch 1501i is connected to the output end of the third transmitting coil 1501h.

[0303] like Figure 21 As shown, during the charging process, if the fourth parallel switch 1501i is closed, the input end of the third transmitting coil 1501h is connected to the first output end of the inverter circuit 1503 through the fourth parallel switch 1501i, and the output end of the third transmitting coil 1501h is connected to the second output end of the inverter circuit 1503, and the third transmitting coil 1501h is connected in parallel to the transmitting end circuit 1501. However, if the fourth parallel switch 1501i is opened, the input end of the third transmitting coil 1501h is left floating, and the third transmitting coil 1501h is disconnected from the transmitting end circuit 1501.

[0304] based on Figure 19 The wireless charging circuit shown in Figure 22a and Figure 22b The transmitter circuit 1501 of the wireless charging circuit may further include: a third parallel switch 1501e, a first series switch 1501f, a second series switch 1501g, and a third series switch 1501j. The third parallel switch 1501e, the first series switch 1501f, the second series switch 1501g, and the third series switch 1501j may each include an input terminal, a first output terminal, and a second output terminal.

[0305] Specifically, see Figure 22a and Figure 22bEach series switch can control whether the transmitting coil is connected to the transmitting end circuit 1501. The first series switch 1501f can be connected in series between the first output end of the inverter circuit 1503 and the first transmitting coil 1501a. The second series switch 1501g can be connected in series between the first transmitting coil 1501a and the second transmitting coil 1501b. The third series switch 1501j can be connected in series between the second transmitting coil 1501b and the third transmitting coil 1501h.

[0306] For example, the input terminal of the first series switch 1501f can be connected to the first output terminal of the inverter circuit 1503, the first output terminal of the first series switch 1501f can be connected to the output terminal of the first transmitting coil 1501a, and the second output terminal of the first series switch 1501f can be connected to the input terminal of the first transmitting coil 1501a. Similarly, the first output terminal of the second series switch 1501g can be connected to the output terminal of the second transmitting coil 1501b, and the second output terminal of the second series switch 1501g can be connected to the input terminal of the second transmitting coil 1501b. The first output terminal of the third series switch 1501j can be connected to the output terminal of the third transmitting coil 1501h and the second output terminal of the inverter circuit 1503, respectively, and the second output terminal of the third series switch 1501j can be connected to the input terminal of the third transmitting coil 1501h.

[0307] During the charging process, for the first transmitting coil 1501a, if the input end of the first series switch 1501f is connected to the first output end of the first series switch 1501f, the first transmitting coil 1501a is cut out of the transmitting end circuit 1501; if the input end of the first series switch 1501f is connected to the second output end of the first series switch 1501f, the first transmitting coil 1501a is connected to the transmitting end circuit 1501.

[0308] Similarly, for the second transmitting coil 1501b, if the input end of the second series switch 1501g is connected to the first output end of the second series switch 1501g, the second transmitting coil 1501b is cut out of the transmitting end circuit 1501; if the input end of the second series switch 1501g is connected to the second output end of the second series switch 1501g, the second transmitting coil 1501b is connected to the transmitting end circuit 1501.

[0309] Similarly, for the third transmitting coil 1501h, if the input terminal of the third series switch 1501j is connected to the first output terminal of the third series switch 1501j, the third transmitting coil 1501h is cut out of the transmitting end circuit 1501; if the input terminal of the third series switch 1501j is connected to the second output terminal of the third series switch 1501j, the third transmitting coil 1501h is connected to the transmitting end circuit 1501.

[0310] Different from the series switches, the parallel switches can control whether the transmitting coils are connected in parallel to the transmitting end circuit 1501 .

[0311] Specifically, see Figure 22a If the first parallel switch 1501c is connected in series between the first output terminal of the inverter circuit 1503 and the second series switch 1501g, the third parallel switch 1501e is connected in series between the first series switch 1501f and the second series switch 1501g, and the second transmitting coil 1501b and the third transmitting coil 1501h are connected in series.

[0312] Accordingly, during the charging process, when the first parallel switch 1501c is closed, if the input end of the third parallel switch 1501e is connected to the first output end of the third parallel switch 1501e, the second transmitting coil 1501b and the third transmitting coil 1501h connected in series are connected in parallel to the transmitting end circuit 1501; if the input end of the third parallel switch 1501e is connected to the second output end of the third parallel switch 1501e, the first transmitting coil 1501a is disconnected from the transmitting end circuit 1501. When the first parallel switch 1501c is disconnected, if the input terminal of the third parallel switch 1501e is connected to the first output terminal of the third parallel switch 1501e, the second transmitting coil 1501b and the third transmitting coil 1501h are disconnected from the transmitting circuit 1501; if the input terminal of the third parallel switch 1501e is connected to the second output terminal of the third parallel switch 1501e, the second transmitting coil 1501b and the third transmitting coil 1501h are connected in series to the transmitting circuit 1501.

[0313] See also Figure 22b If the first parallel switch 1501c is connected in series between the first output terminal of the inverter circuit 1503 and the third series switch 1501j, the third parallel switch 1501e is connected in series between the second series switch 1501g and the third series switch 1501j, and the first transmitting coil 1501a and the second transmitting coil 1501b are connected in series.

[0314] Accordingly, during the charging process, when the first parallel switch 1501c is closed, if the input terminal of the third parallel switch 1501e is connected to the first output terminal of the third parallel switch 1501e, the third transmitting coil 1501h is connected in parallel to the transmitting circuit 1501. If the input terminal of the third parallel switch 1501e is connected to the second output terminal of the third parallel switch 1501e, the first transmitting coil 1501a and the second transmitting coil 1501b are disconnected from the transmitting circuit 1501. When the first parallel switch 1501c is open, if the input terminal of the third parallel switch 1501e is connected to the first output terminal of the third parallel switch 1501e, the third transmitting coil 1501h is disconnected from the transmitting circuit 1501. If the input terminal of the third parallel switch 1501e is connected to the second output terminal of the third parallel switch 1501e, the third transmitting coil 1501h is connected in series to the transmitting circuit 1501.

[0315] like Figure 22a and Figure 22b The transmitter circuit 1501 shown in FIG. Figure 12a and Figure 12b The transmitter circuit 1501 shown is similar and will not be described again here.

[0316] based on Figure 22a The wireless charging circuit shown in Figure 23 The transmitter circuit 1501 of the wireless charging circuit may further include: a second parallel switch 1501d and a fifth parallel switch 1501k. The second parallel switch 1501d may include a first end and a second end, and the fifth parallel switch 1501k may include an input end, a first output end, and a second output end.

[0317] like Figure 23 As shown, if the first parallel switch 1501c is connected in series between the first output end of the inverter circuit 1503 and the second series switch 1501g, and the third parallel switch 1501e is connected in series between the first series switch 1501f and the second series switch 1501g, then the second parallel switch 1501d is connected in series between the first output end of the inverter circuit 1503 and the third series switch 1501j, and the fifth parallel switch 1501k is connected in series between the second series switch 1501g and the third series switch 1501j.

[0318] During the charging process, when the second parallel switch 1501d is closed, if the input end of the fifth parallel switch 1501k is connected to the first output end of the fifth parallel switch 1501k, the third transmitting coil 1501h is connected in parallel to the transmitting circuit 1501; if the input end of the fifth parallel switch 1501k is connected to the second output end of the fifth parallel switch 1501k, the first transmitting coil 1501a and / or the second transmitting coil 1501b are disconnected from the transmitting circuit 1501.

[0319] When the second parallel switch 1501d is disconnected, if the input end of the fifth parallel switch 1501k is connected to the first output end of the fifth parallel switch 1501k, the third transmitting coil 1501h is cut out of the transmitting circuit 1501; if the input end of the fifth parallel switch 1501k is connected to the second output end of the fifth parallel switch 1501k, the third transmitting coil 1501h is connected in series with the transmitting circuit 1501.

[0320] like Figure 23 The transmitter circuit 1501 shown in FIG. Figure 13 The transmitter circuit 1501 shown is similar and will not be described again here.

[0321] In summary, the wireless charging circuit provided in the embodiments of the present application comprises a rectifier circuit, an inverter circuit connected to the output of the rectifier circuit, and a transmitter circuit connected to the output of the inverter circuit. Furthermore, the transmitter circuit comprises first and second transmitting coils connected in parallel, each of which includes a cylindrical magnetic core and a wire wound around the cylindrical magnetic core. Without compromising charging performance, the wireless charging circuit, based on the compactness and flexibility of the first and second transmitting coils, can adapt to narrow or irregular spaces. This reduces assembly space requirements, improves assembly flexibility and adaptability, and provides greater design space for a thin, lightweight, and compact device.

[0322] Furthermore, by providing series switches in the transmitter circuit, the number of transmitter coils connected to the transmitter circuit can be controlled, thereby adjusting the inductance of the transmitter circuit. This allows the transmission power of the transmitter circuit to be varied according to the varying inductance, thereby improving the transmission power of the transmitter circuit. Furthermore, each series switch can be used to identify a faulty transmitter coil in the transmitter circuit and isolate it from the transmitter circuit, reducing maintenance costs for the transmitter circuit.

[0323] Furthermore, by further providing parallel switches in the transmitter circuit and controlling the coordinated on and off functions of the series switches and the parallel switches, the connection mode of the transmitter coils in the transmitter circuit can be changed. Thus, the inductance of the transmitter circuit can be adjusted based on the changed connection mode of the transmitter coils. This improves the wireless transmission power in the parallel-connected transmitter circuits and increases the maximum current carrying capacity of the coils as a whole. This, in turn, increases the maximum current carrying capacity of the transmitter circuit, thereby improving the transmission power of the transmitter circuit.

[0324] In addition, by providing protruding structures at both ends of the magnetic core, the magnetic lines of force of the magnetic core can be guided and gathered through the protruding structures, thereby improving the conversion rate of the wireless charging circuit.

[0325] The above embodiments describe wireless charging circuits based on serially and parallelly connected transmitting coils in a transmitting circuit. In practical applications, the wireless charging circuit may include not only the wireless charging circuit in the charging device but also the wireless charging circuit in the device to be charged. The wireless charging circuit in the device to be charged may include a battery, a rectifier bridge circuit, and a receiving circuit. The receiving circuit may be connected to the input of the rectifier bridge circuit, and the output of the rectifier bridge circuit may be connected to the battery.

[0326] Moreover, the receiving end circuit includes at least two receiving coils, and the at least two receiving coils in the receiving end circuit can be arranged according to Figures 5 to 23 The connection method of each transmitting coil in any transmitting end circuit is connected, which will not be repeated here.

[0327] It should be noted that each receiving coil may include a cylindrical magnetic core and a wire wound around the cylindrical magnetic core.

[0328] In summary, the wireless charging circuit provided in the embodiments of the present application comprises a rectifier bridge circuit, a receiving circuit connected to the input of the rectifier bridge circuit, and a battery connected to the output of the rectifier bridge circuit. Furthermore, the receiving circuit comprises a first receiving coil and a second receiving coil, each of which includes a cylindrical magnetic core and a wire wound around the cylindrical magnetic core. Without compromising charging performance, the wireless charging circuit, based on the compactness and flexibility of the first and second receiving coils, can adapt to narrow or irregular spaces. This reduces assembly space requirements, improves assembly flexibility and adaptability, and provides greater design space for a thin, lightweight, and compact device.

[0329] Furthermore, by providing series switches in the receiving circuit, the number of receiving coils connected to the receiving circuit can be controlled, thereby adjusting the inductance of the receiving circuit. This allows the transmission power of the receiving circuit to be varied according to the varying inductance, thereby improving the transmission power of the receiving circuit. Furthermore, each series switch can be used to identify a faulty receiving coil in the receiving circuit and isolate it from the receiving circuit, reducing maintenance costs for the receiving circuit.

[0330] Furthermore, by continuing to set parallel switches in the receiving end circuit and controlling the coordinated on and off of each series switch and each parallel switch, the connection method of each receiving coil in the receiving end circuit can be changed, thereby adjusting the inductance value of the receiving end circuit according to the change in the connection method of the receiving coil. In this way, the wireless transmission power can be increased in the parallel-connected receiving end circuit, and the maximum current carrying capacity of the entire coil can be increased. In other words, the maximum current carrying capacity of the receiving end circuit can be increased, thereby increasing the transmission power of the receiving end circuit.

[0331] In addition, by providing protruding structures at both ends of the magnetic core, the magnetic lines of force of the magnetic core can be guided and gathered through the protruding structures, thereby improving the conversion rate of the wireless charging circuit.

[0332] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0333] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0334] In the embodiments provided in this application, it should be understood that the disclosed circuits and terminal devices can be implemented in other ways. For example, the system embodiments described above are merely illustrative. For example, the division of the modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0335] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0336] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0337] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A wireless charging circuit, characterized in that: include: A transmitter circuit, a rectifier circuit, and an inverter circuit, wherein the output of the rectifier circuit is connected to the input of the inverter circuit, and the output of the inverter circuit is connected to the transmitter circuit; The transmitting end circuit includes: a first transmitting coil and a second transmitting coil, the first transmitting coil and the second transmitting coil are connected in series, and the first transmitting coil and the second transmitting coil each include a cylindrical magnetic core and a wire wound around the cylindrical magnetic core; The output end of the inverter circuit includes a first output end and a second output end, and the transmitter circuit further includes: a first series switch and a second series switch; the first series switch is connected in series between the first transmitting coil and the first output end of the inverter circuit, and the second series switch is connected in series between the first transmitting coil and the second transmitting coil; The transmitter circuit further includes: a first parallel switch and a second parallel switch, the first parallel switch including a first end and a second end, the second parallel switch including an input end, a first output end and a second output end; The first parallel switch is connected in series between the first output terminal of the inverter circuit and the second series switch, and the second parallel switch is connected in series between the first series switch and the second series switch; When the first parallel switch is closed, if the input terminal of the second parallel switch is connected to the first output terminal of the second parallel switch, the first transmitting coil and the second transmitting coil are connected in parallel; if the input terminal of the second parallel switch is connected to the second output terminal of the second parallel switch, the first transmitting coil is cut out of the transmitting end circuit; When the first parallel switch is disconnected, if the input end of the second parallel switch is connected to the second output end of the second parallel switch, the first transmitting coil and the second transmitting coil are connected in series; if the input end of the second parallel switch is connected to the first output end of the second parallel switch, the second transmitting coil is cut out of the transmitting end circuit.

2. The wireless charging circuit according to claim 1, wherein: The first series switch includes an input terminal, a first output terminal, and a second output terminal; If the input end of the first series switch is connected to the first output end of the first series switch, the first transmitting coil is cut out of the transmitting end circuit; if the input end of the first series switch is connected to the second output end of the first series switch, the first transmitting coil is connected to the transmitting end circuit.

3. The wireless charging circuit according to claim 2, wherein: The second series switch includes an input terminal, a first output terminal, and a second output terminal; If the input end of the second series switch is connected to the first output end of the second series switch, the second transmitting coil is cut out of the transmitting end circuit; if the input end of the second series switch is connected to the second output end of the second series switch, the second transmitting coil is connected to the transmitting end circuit.

4. The wireless charging circuit according to claim 2, wherein: The transmitting end circuit further includes: a third transmitting coil; The first transmitting coil, the second transmitting coil and the third transmitting coil are connected in series in sequence; The first series switch is connected in series between the second transmitting coil and the third transmitting coil. If the input end of the first series switch is connected to the first output end of the first series switch, the third transmitting coil is disconnected from the transmitting circuit. If the input end of the first series switch is connected to the second output end of the first series switch, the third transmitting coil is connected to the transmitting circuit.

5. The wireless charging circuit according to claim 4, wherein: The second series switch includes an input terminal, a first output terminal, and a second output terminal; If the first series switch is connected in series between the first transmitting coil and the first output terminal of the inverter circuit, the second series switch is connected in series between the first transmitting coil and the second transmitting coil, or the second series switch is connected in series between the second transmitting coil and the third transmitting coil. If the input terminal of the second series switch is connected to the first output terminal of the second series switch, the second transmitting coil or the third transmitting coil is disconnected from the transmitting circuit. If the input terminal of the second series switch is connected to the second output terminal of the second series switch, the second transmitting coil or the third transmitting coil is connected to the transmitting circuit. If the first series switch is connected in series between the first transmitting coil and the second transmitting coil, the second series switch is connected in series between the second transmitting coil and the third transmitting coil. If the input end of the second series switch is connected to the first output end of the second series switch, the third transmitting coil is disconnected from the transmitting circuit. If the input end of the second series switch is connected to the second output end of the second series switch, the third transmitting coil is connected to the transmitting circuit.

6. The wireless charging circuit according to claim 5, wherein: The transmitter circuit further includes: a third series switch, the third series switch including an input terminal, a first output terminal, and a second output terminal; If the first series switch is connected in series between the first transmitting coil and the first output terminal of the inverter circuit, and the second series switch is connected in series between the first transmitting coil and the second transmitting coil, then the third series switch is connected in series between the second transmitting coil and the third transmitting coil; If the input end of the third series switch is connected to the first output end of the third series switch, the third transmitting coil is cut out of the transmitting end circuit; if the input end of the third series switch is connected to the second output end of the third series switch, the third transmitting coil is connected to the transmitting end circuit.

7. The wireless charging circuit according to claim 6, wherein: The first parallel switch is connected in series between the second series switch and the first output terminal of the inverter circuit, the second parallel switch is connected in series between the first series switch and the second series switch, and the second transmitting coil is connected in series with the third transmitting coil; When the first parallel switch is closed, if the input terminal of the second parallel switch is connected to the first output terminal of the second parallel switch, the first transmitting coil is connected in parallel with the second transmitting coil and the third transmitting coil that are connected in series; if the input terminal of the second parallel switch is connected to the second output terminal of the second parallel switch, the first transmitting coil is cut out of the transmitting end circuit; When the first parallel switch is disconnected, if the input terminal of the second parallel switch is connected to the second output terminal of the second parallel switch, the first transmitting coil and the second transmitting coil are connected in series; if the input terminal of the second parallel switch is connected to the first output terminal of the second parallel switch, the second transmitting coil and the third transmitting coil are cut out of the transmitting end circuit; Alternatively, the first parallel switch is connected in series between the third series switch and the first output terminal of the inverter circuit, the second parallel switch is connected in series between the second series switch and the third series switch, and the first transmitting coil and the second transmitting coil are connected in series; When the first parallel switch is closed, if the input terminal of the second parallel switch is connected to the first output terminal of the second parallel switch, the first transmitting coil and the second transmitting coil, which are connected in series, are connected in parallel with the third transmitting coil; and if the input terminal of the second parallel switch is connected to the second output terminal of the second parallel switch, the first transmitting coil and the second transmitting coil are cut out of the transmitting end circuit; When the first parallel switch is disconnected, if the input end of the second parallel switch is connected to the second output end of the second parallel switch, the second transmitting coil is connected in series with the third transmitting coil; if the input end of the second parallel switch is connected to the first output end of the second parallel switch, the third transmitting coil is cut out of the transmitting end circuit.

8. The wireless charging circuit according to claim 7, wherein: The transmitter circuit further includes: a third parallel switch and a fourth parallel switch, the third parallel switch including a first end and a second end, and the fourth parallel switch including an input end, a first output end and a second output end; If the first parallel switch is connected in series between the second series switch and the first output terminal of the inverter circuit, and the second parallel switch is connected in series between the first series switch and the second series switch, then the third parallel switch is connected in series between the third series switch and the first output terminal of the inverter circuit, and the fourth parallel switch is connected in series between the second series switch and the third series switch; When the third parallel switch is closed, if the input terminal of the fourth parallel switch is connected to the first output terminal of the fourth parallel switch, the first transmitting coil and / or the second transmitting coil are connected in parallel with the third transmitting coil; if the input terminal of the fourth parallel switch is connected to the second output terminal of the fourth parallel switch, the first transmitting coil and the second transmitting coil are cut out of the transmitting end circuit; When the third parallel switch is disconnected, if the input end of the fourth parallel switch is connected to the second output end of the fourth parallel switch, the first transmitting coil and / or the second transmitting coil are connected in series with the third transmitting coil; if the input end of the fourth parallel switch is connected to the first output end of the fourth parallel switch, the third transmitting coil is cut out of the transmitting end circuit.

9. A wireless charging circuit, characterized in that: include: A transmitter circuit, a rectifier circuit, and an inverter circuit, wherein the output of the rectifier circuit is connected to the input of the inverter circuit, and the output of the inverter circuit is connected to the transmitter circuit; The transmitting end circuit includes: a first transmitting coil and a second transmitting coil, the first transmitting coil and the second transmitting coil are connected in parallel, and the first transmitting coil and the second transmitting coil each include a cylindrical magnetic core and a wire wound around the cylindrical magnetic core; The output end of the inverter circuit includes a first output end and a second output end, and the transmitter circuit further includes a first parallel switch, and the first parallel switch includes a first end and a second end; The first parallel switch is connected in series between the first output terminal of the inverter circuit and the first transmitting coil. When the first parallel switch is closed, the first transmitting coil is connected in parallel to the transmitting end circuit. When the first parallel switch is opened, the first transmitting coil is disconnected from the transmitting end circuit. Alternatively, the first parallel switch is connected in series between the first output terminal of the inverter circuit and the second transmitting coil. If the first parallel switch is closed, the second transmitting coil is connected in parallel to the transmitting end circuit. If the first parallel switch is opened, the second transmitting coil is disconnected from the transmitting end circuit. The transmitter circuit further includes a third parallel switch, a first series switch, and a second series switch, wherein the third parallel switch, the first series switch, and the second series switch each include an input terminal, a first output terminal, and a second output terminal; The first series switch is connected in series between the first output terminal of the inverter circuit and the first transmitting coil, the third parallel switch and the second series switch are connected in series between the first transmitting coil and the second transmitting coil, and the first parallel switch is connected in series between the first output terminal of the inverter circuit and the second series switch; If the input end of the first series switch is connected to the first output end of the first series switch, the first transmitting coil is cut out of the transmitting end circuit; if the input end of the first series switch is connected to the second output end of the first series switch, the first transmitting coil is connected to the transmitting end circuit; If the input end of the second series switch is connected to the first output end of the second series switch, the second transmitting coil is cut out of the transmitting end circuit; if the input end of the second series switch is connected to the second output end of the second series switch, the second transmitting coil is connected to the transmitting end circuit.

10. The wireless charging circuit according to claim 9, wherein: The transmitting end circuit further includes a second parallel switch, wherein the second parallel switch includes a first end and a second end; If the first parallel switch is connected in series between the first output terminal of the inverter circuit and the first transmitting coil, then the second parallel switch is connected in series between the first output terminal of the inverter circuit and the second transmitting coil. If the second parallel switch is closed, the second transmitting coil is connected in parallel to the transmitting circuit. If the second parallel switch is open, the second transmitting coil is disconnected from the transmitting circuit.

11. The wireless charging circuit according to claim 9, wherein: When the first parallel switch is closed, if the input end of the third parallel switch is connected to the first output end of the third parallel switch, the second transmitting coil is connected in parallel to the transmitting end circuit; if the input end of the third parallel switch is connected to the second output end of the third parallel switch, the first transmitting coil is disconnected from the transmitting end circuit; When the first parallel switch is disconnected, if the input end of the third parallel switch is connected to the first output end of the third parallel switch, the second transmitting coil is cut out of the transmitting end circuit; if the input end of the third parallel switch is connected to the second output end of the third parallel switch, the second transmitting coil is connected in series with the transmitting end circuit.

12. The wireless charging circuit according to claim 9, wherein: The transmitting end circuit further includes a third transmitting coil; The first transmitting coil, the second transmitting coil and the third transmitting coil are connected in parallel; The first parallel switch is connected in series between the first output terminal of the inverter circuit and the third transmitting coil. If the first parallel switch is closed, the third transmitting coil is connected in parallel to the transmitting end circuit. If the first parallel switch is opened, the third transmitting coil is disconnected from the transmitting end circuit.

13. The wireless charging circuit according to claim 12, wherein: The transmitting end circuit further includes a second parallel switch, wherein the second parallel switch includes a first end and a second end; If the first parallel switch is connected in series between the first output terminal of the inverter circuit and the first transmitting coil, then the second parallel switch is connected in series between the first output terminal of the inverter circuit and the second transmitting coil. If the second parallel switch is closed, the second transmitting coil is connected in parallel to the transmitting end circuit. If the second parallel switch is opened, the second transmitting coil is disconnected from the transmitting end circuit. Alternatively, if the first parallel switch is connected in series between the first output terminal of the inverter circuit and the first transmitting coil, then the second parallel switch is connected in series between the first output terminal of the inverter circuit and the third transmitting coil. If the second parallel switch is closed, the third transmitting coil is connected in parallel to the transmitting circuit. If the second parallel switch is open, the third transmitting coil is disconnected from the transmitting circuit. Alternatively, if the first parallel switch is connected in series between the first output terminal of the inverter circuit and the second transmitting coil, the second parallel switch is connected in series between the first output terminal of the inverter circuit and the third transmitting coil. If the second parallel switch is closed, the third transmitting coil is connected in parallel to the transmitting circuit. If the second parallel switch is open, the third transmitting coil is disconnected from the transmitting circuit.

14. The wireless charging circuit according to claim 13, wherein: The transmitting end circuit further includes a fourth parallel switch, wherein the fourth parallel switch includes a first end and a second end; If the first parallel switch is connected in series between the first output terminal of the inverter circuit and the first transmitting coil, and the second parallel switch is connected in series between the first output terminal of the inverter circuit and the second transmitting coil, then the fourth parallel switch is connected in series between the first output terminal of the inverter circuit and the third transmitting coil; If the fourth parallel switch is closed, the third transmitting coil is connected in parallel to the transmitting end circuit; if the fourth parallel switch is opened, the third transmitting coil is cut out of the transmitting end circuit.

15. The wireless charging circuit according to claim 12, wherein: The transmitter circuit further includes a third parallel switch, a first series switch, a second series switch, and a third series switch, wherein the third parallel switch, the first series switch, the second series switch, and the third series switch each include an input end, a first output end, and a second output end; The first series switch is connected in series between the first output terminal of the inverter circuit and the first transmitting coil, the second series switch is connected in series between the first transmitting coil and the second transmitting coil, and the third series switch is connected in series between the second transmitting coil and the third transmitting coil; If the input end of the first series switch is connected to the first output end of the first series switch, the first transmitting coil is cut out of the transmitting end circuit; if the input end of the first series switch is connected to the second output end of the first series switch, the first transmitting coil is connected to the transmitting end circuit; If the input end of the second series switch is connected to the first output end of the second series switch, the second transmitting coil is cut out of the transmitting end circuit; if the input end of the second series switch is connected to the second output end of the second series switch, the second transmitting coil is connected to the transmitting end circuit; If the input end of the third series switch is connected to the first output end of the third series switch, the third transmitting coil is cut out of the transmitting end circuit; if the input end of the third series switch is connected to the second output end of the third series switch, the third transmitting coil is connected to the transmitting end circuit; If the first parallel switch is connected in series between the first output terminal of the inverter circuit and the second series switch, the third parallel switch is connected in series between the first and second series switches, and the second and third transmitting coils are connected in series. When the first parallel switch is closed, if the input terminal of the third parallel switch is connected to the first output terminal of the third parallel switch, the second and third transmitting coils connected in series are connected in parallel to the transmitting circuit. If the input terminal of the third parallel switch is connected to the second output terminal of the third parallel switch, the first transmitting coil is disconnected from the transmitting circuit. When the first parallel switch is open, if the input terminal of the third parallel switch is connected to the first output terminal of the third parallel switch, the second and third transmitting coils are disconnected from the transmitting circuit. If the input terminal of the third parallel switch is connected to the second output terminal of the third parallel switch, the second and third transmitting coils are connected in series to the transmitting circuit. If the first parallel switch is connected in series between the first output terminal of the inverter circuit and the third series switch, the third parallel switch is connected in series between the second series switch and the third series switch, and the first transmitting coil and the second transmitting coil are connected in series. When the first parallel switch is closed, if the input terminal of the third parallel switch is connected to the first output terminal of the third parallel switch, the third transmitting coil is connected in parallel to the transmitting circuit. If the input terminal of the third parallel switch is connected to the second output terminal of the third parallel switch, the first transmitting coil and the second transmitting coil are disconnected from the transmitting circuit. When the first parallel switch is open, if the input terminal of the third parallel switch is connected to the first output terminal of the third parallel switch, the third transmitting coil is disconnected from the transmitting circuit. If the input terminal of the third parallel switch is connected to the second output terminal of the third parallel switch, the third transmitting coil is connected in series to the transmitting circuit.

16. The wireless charging circuit according to claim 15, wherein: The transmitter circuit further includes a second parallel switch and a fifth parallel switch, the second parallel switch includes a first end and a second end, and the fifth parallel switch includes an input end, a first output end, and a second output end; If the first parallel switch is connected in series between the first output terminal of the inverter circuit and the second series switch, and the third parallel switch is connected in series between the first series switch and the second series switch, then the second parallel switch is connected in series between the first output terminal of the inverter circuit and the third series switch, and the fifth parallel switch is connected in series between the second series switch and the third series switch; When the second parallel switch is closed, if the input end of the fifth parallel switch is connected to the first output end of the fifth parallel switch, the third transmitting coil is connected in parallel to the transmitting end circuit; if the input end of the fifth parallel switch is connected to the second output end of the fifth parallel switch, the first transmitting coil and / or the second transmitting coil is disconnected from the transmitting end circuit; When the second parallel switch is disconnected, if the input end of the fifth parallel switch is connected to the first output end of the fifth parallel switch, the third transmitting coil is cut out of the transmitting end circuit; if the input end of the fifth parallel switch is connected to the second output end of the fifth parallel switch, the third transmitting coil is connected in series with the transmitting end circuit.

17. A wireless charging circuit, characterized in that: include: A battery, a rectifier bridge circuit, and a receiving-end circuit, wherein the receiving-end circuit is connected to an input end of the rectifier bridge circuit, and an output end of the rectifier bridge circuit is connected to the battery; The receiving end circuit includes at least two receiving coils, wherein the at least two receiving coils in the receiving end circuit are connected in series or in parallel, and each receiving coil includes a cylindrical magnetic core and a wire wound around the cylindrical magnetic core; The receiving end circuit further includes a series switch and a parallel switch, and the series switch and the parallel switch are connected according to the connection method of the series switch and the parallel switch in the transmitting end circuit according to any one of claims 1 to 16.

18. A charging device, characterized in that: The charging device includes the transmitter circuit according to any one of claims 1 to 16, the shape of the arrangement of each transmitter coil in the transmitter circuit matches the accommodation space of the charging device, and the transmitter circuit is arranged in the accommodation space.

19. A device to be charged, characterized in that: The device to be charged includes the receiving end circuit as claimed in claim 17, the shape of the arrangement of each receiving coil in the receiving end circuit matches the accommodation space of the device to be charged, and the receiving end circuit is arranged in the accommodation space.

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