Transmitter in wireless power transmission system

Abstract

The present application proposes a transmitter, relating to wireless power transfer, comprising: a switching unit; the resonant cavity is in cascade connection with the switch unit and comprises at least one magnetic absorption resonant inductance branch and at least one non-magnetic absorption resonant inductance branch, each magnetic absorption resonant inductance branch comprises a magnetic absorption resonant coil and a switch tube which are connected in series, and each non-magnetic absorption resonant inductance branch comprises a non-magnetic absorption resonant coil and a switch tube which are connected in series; the resonant capacitor unit is used for forming resonance with the magnetic absorption resonance coil and the non-magnetic absorption resonance coil, a switching tube in a magnetic absorption resonance inductance branch is configured to be conducted, and the resonant capacitor unit is configured, so that the transmitter works in a magnetic absorption charging mode to charge magnetic absorption equipment; a switching tube in a non-magnetic resonant inductance branch is configured to be conducted, and a resonant capacitor unit is configured, so that the transmitter works in a non-magnetic charging mode to charge non-magnetic equipment. And charging of non-magnetic equipment and charging of magnetic equipment can be compatible.

Description

Technical Field

[0001] The present application relates to wireless power transmission, and more particularly to a transmitter in a wireless power transmission system. Background Art

[0002] As technology develops, wireless power transfer has become an efficient and convenient mechanism for powering or charging battery-based mobile devices such as mobile phones, tablets, digital cameras, and similar devices.

[0003] The wireless power transmission system includes a transmitter and a receiver. When the receiver is placed within the output power range of the transmitter, magnetic coupling is established between the transmitter coil in the transmitter and the receiver coil in the receiver, and the output power of the transmitter is transmitted to the receiver, that is, wireless power transmission is formed between the transmitter and the receiver to charge the load (such as a rechargeable battery and / or battery pack in a mobile device).

[0004] The current wireless power transmission system is divided into non-magnetic wireless charging system and magnetic wireless charging system. Non-magnetic wireless charging system uses non-magnetic charging protocols (such as EPP protocol and private high-power charging protocol) suitable for charging non-magnetic devices to charge non-magnetic devices. Magnetic wireless charging system uses magnetic charging protocols (such as MPP protocol) suitable for charging magnetic devices to charge magnetic devices.

[0005] However, currently there is no transmitter that is compatible with charging both non-magnetic devices and magnetic devices, which brings inconvenience to users. Summary of the invention

[0006] According to one embodiment, the present application provides a transmitter, comprising: a switching unit; a resonant cavity, cascade-connected to the switching unit, comprising at least one magnetic resonant inductor branch and at least one non-magnetic resonant inductor branch, each of the magnetic resonant inductor branch comprising a magnetic resonant coil and a switch tube connected in series, each of the non-magnetic resonant inductor branch comprising a non-magnetic resonant coil and a switch tube connected in series, and a resonant capacitor unit for forming resonance with the magnetic resonant coil and the non-magnetic resonant coil, wherein the switch tube in a magnetic resonant inductor branch is turned on, and the resonant capacitor unit is configured so that the transmitter operates in a magnetic charging mode to charge a magnetic device; the switch tube in a non-magnetic resonant inductor branch is turned on, and the resonant capacitor unit is configured so that the transmitter operates in a non-magnetic charging mode to charge a non-magnetic device.

[0007] Furthermore, it also includes a filtering unit, which includes a filtering capacitor unit and a filtering inductor unit, the filtering capacitor unit is connected in parallel with the resonant cavity, and the filtering inductor unit is connected between the filtering capacitor unit and the switching unit, wherein the filtering capacitor unit includes a first filtering capacitor branch and a second filtering capacitor branch connected in parallel, the first filtering capacitor branch includes a first filtering capacitor and a first filtering control switching tube connected in series, and the second filtering capacitor branch includes a second filtering capacitor and a second filtering control switching tube connected in series.

[0008] Furthermore, when the transmitter is configured to operate in a non-magnetic charging mode, the first filter control switch tube and the second filter control switch tube are both configured to be turned on; when the transmitter is configured to operate in a magnetic charging mode, the second filter control switch tube is configured to be turned on.

[0009] Furthermore, when it is detected that a magnetic device is coupled with a magnetic resonant coil, the switch tube in the magnetic resonant inductor branch where the magnetic resonant coil is located is controlled to be turned on, and the switch unit and the resonant capacitor unit are configured so that the transmitter operates in a magnetic charging mode; when it is detected that a magnetic device is coupled with a non-magnetic resonant coil, the switch tube in the non-magnetic resonant inductor branch where the non-magnetic resonant coil is located is controlled to be turned on, and the switch unit and the resonant capacitor unit are configured so that the transmitter operates in a non-magnetic charging mode; when it is detected that a non-magnetic device is coupled with a non-magnetic resonant coil, the switch tube in the non-magnetic resonant inductor branch where the non-magnetic resonant coil is located is controlled to be turned on, and the switch unit and the resonant capacitor unit are configured so that the transmitter operates in a non-magnetic charging mode; when it is detected that a non-magnetic device is coupled with a magnetic resonant coil, the switch tube in the magnetic resonant inductor branch where the magnetic resonant coil is located is controlled to be turned on, and the switch unit and the resonant capacitor unit are configured so that the transmitter operates in a non-magnetic charging mode.

[0010] Furthermore, the magnetic attraction resonant coil is higher than the non-magnetic attraction resonant coil in the vertical direction.

[0011] Furthermore, the at least one magnetically attracted resonant inductor branch is connected in parallel with the at least one non-magnetically attracted resonant inductor branch to form a resonant inductor unit; the resonant capacitor unit includes a plurality of capacitor branches connected in parallel with each other, wherein at least one of the capacitor branches includes a resonant capacitor and a switch tube connected in series, wherein the resonant inductor unit is connected in series with the resonant capacitor unit.

[0012] Furthermore, the resonant capacitor unit includes: a first capacitor branch, including a first resonant capacitor; a second capacitor branch, including a second resonant capacitor and a second resonant capacitor control switch tube connected in series.

[0013] Furthermore, when the transmitter is configured to operate in a magnetic charging mode, the capacitance of the resonant capacitor connected to the resonant capacitor unit is adjusted according to different stages, different frequencies, and the coupling coefficient with the magnetic device in the magnetic charging mode; when the transmitter is configured to operate in a non-magnetic charging mode, the resonant capacitor connected to the resonant capacitor unit is adjusted according to the non-magnetic charging protocol.

[0014] Furthermore, the at least one magnetic resonant inductor branch constitutes a magnetic resonant inductor unit; the resonant capacitor unit includes a first capacitor unit, the first capacitor unit is connected in series with the magnetic resonant inductor unit to form a magnetic resonant unit, the first capacitor unit includes a plurality of capacitor branches connected in parallel to each other, wherein at least one of the capacitor branches includes a resonant capacitor and a switch tube connected in series; the resonant capacitor unit also includes a resonant capacitor connected in series with each of the non-magnetic resonant inductor branches to form at least one non-magnetic resonant coil, a switch tube and a non-magnetic branch formed by connecting the resonant capacitor in series, and the at least one non-magnetic branch forms a non-magnetic resonant unit, wherein the magnetic resonant unit is connected in parallel with the non-magnetic resonant unit.

[0015] Furthermore, the first capacitor unit includes: a first capacitor branch including a first resonant capacitor; and a second capacitor branch including a second resonant capacitor and a second switch tube connected in series.

[0016] Furthermore, when the transmitter is configured to operate in a magnetic charging mode, the resonant capacitor connected to the first capacitor unit is adjusted according to different stages, different frequencies, and a coupling coefficient with a magnetic device in the magnetic charging mode.

[0017] The features and technical advantages of the present disclosure have been summarized quite extensively above so that the detailed description disclosed below may be better understood. Additional features and advantages of the present disclosure will be described below, which constitute the subject matter of the claims of the present disclosure. It will be appreciated by those skilled in the art that the disclosed concepts and specific embodiments may be easily used as a basis for modifying or designing other structures or processes for achieving the same purpose of the present disclosure. It will also be appreciated by those skilled in the art that such equivalent structures do not depart from the spirit and scope of the present disclosure as set forth in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description in conjunction with the accompanying drawings, in which:

[0019] Figure 1 A schematic diagram of a transmitter block diagram according to an embodiment of the present application is shown;

[0020] Figure 2A schematic diagram of a transmitter block diagram of another embodiment of the present application is shown;

[0021] Figure 3 A schematic diagram showing the relative position arrangement of coils in one embodiment of the present application is shown;

[0022] Figure 4 A schematic diagram showing the arrangement of coils in the vertical direction according to an embodiment of the present application is shown;

[0023] Figure 5 A schematic diagram of a transmitter circuit of a specific embodiment of the present application is shown;

[0024] Figure 6 A schematic diagram of a transmitter circuit of another specific embodiment of the present application is shown;

[0025] Figure 7 A schematic diagram of a transmitter circuit of another specific embodiment of the present application is shown;

[0026] Figure 8 A schematic diagram of a transmitter circuit of another specific embodiment of the present application is shown;

[0027] Fig. 9 A schematic diagram of a transmitter circuit of another specific embodiment of the present application is shown;

[0028] Fig.10 A schematic diagram of a transmitter circuit of another specific embodiment of the present application is shown;

[0029] Fig.11 A flow chart of a control method for a transmitter in a wireless power transmission system according to an embodiment of the present application is shown.

[0030] Corresponding numerals and symbols in the different figures generally refer to corresponding parts unless otherwise indicated.The figures are drawn to clearly illustrate the relevant aspects of the various embodiments and are not necessarily drawn to scale. DETAILED DESCRIPTION

[0031] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] In one embodiment of the present application, a transmitter is provided for use in a wireless power transmission system, which is compatible with charging non-magnetic devices and magnetic devices. Figure 1 The transmitter block diagram of an embodiment of the present application is shown in FIG. 1 , wherein the transmitter of an embodiment of the present application includes:

[0033] Switch unit 100;

[0034] The resonant cavity 200 is connected in cascade with the switch unit 100, and includes at least one magnetic resonant inductor branch and at least one non-magnetic resonant inductor branch. Each magnetic resonant inductor branch includes a magnetic resonant coil Lpm and a switch tube Qm connected in series. Each non-magnetic resonant inductor branch includes a non-magnetic resonant coil Lpb and a switch tube Qb connected in series, and a resonant capacitor unit 220 for forming resonance with the magnetic resonant coil and the non-magnetic resonant coil.

[0035] A switch tube in a magnetic resonant inductor branch is turned on, and a resonant capacitor unit 220 is configured, so that the transmitter works in a magnetic charging mode to charge the magnetic device; a switch tube in a non-magnetic resonant inductor branch is turned on, and a resonant capacitor unit 220 is configured, so that the transmitter works in a non-magnetic charging mode to charge the non-magnetic device.

[0036] As described above, a magnetic attraction resonant coil and a non-magnetic attraction resonant coil are simultaneously provided in the resonant inductor unit 210 of the resonant cavity 200, as well as a resonant capacitor unit 220 for forming resonance with the magnetic attraction resonant coil and the non-magnetic attraction resonant coil. When the magnetic attraction device needs to be charged, the switch tube connected in series with the magnetic attraction resonant coil is turned on to select the magnetic attraction resonant coil; when the non-magnetic attraction device needs to be charged, the switch tube connected in series with the non-magnetic attraction resonant coil is turned on to select the non-magnetic attraction resonant coil. In this way, the transmitter provided in the present application can be compatible with charging non-magnetic attraction devices and charging magnetic attraction devices.

[0037] For example, when the device that the user needs to charge is a non-magnetic device, the non-magnetic device can be placed in the area where the non-magnetic resonant coil of the transmitter is located, and the controller of the transmitter will turn on the switch tube connected in series with the non-magnetic resonant coil to select the non-magnetic resonant coil, and then a non-magnetic charging protocol (such as the EPP protocol or a private high-power charging protocol) can be used to charge the non-magnetic device. When the device that the user needs to charge is a magnetic device, the magnetic device can be placed in the area where the magnetic resonant coil of the transmitter is located, and the controller of the transmitter will turn on the switch tube connected in series with the magnetic resonant coil to select the magnetic resonant coil, and then a magnetic charging protocol (such as the MPP protocol) can be used to charge the magnetic device. And from the above analysis, it can be seen that both magnetic charging and non-magnetic charging can achieve the same characteristics as existing magnetic charging and non-magnetic charging.

[0038] And if Figure 1 As shown, only one switch unit 100 is required to drive the resonant cavity 200 that is compatible with non-magnetic charging and magnetic charging, so that the transmitter is more integrated.

[0039] In actual applications, when the device to be charged (that is, the receiver RX) is placed on the transmitter, the transmitter can detect whether the device to be charged has a magnetic suction function and whether it supports the magnetic suction charging protocol (such as the MPP protocol), and can detect which resonant inductor the device to be charged is placed near, that is, the resonant inductor in the device to be charged is coupled with which resonant inductor in the transmitter.

[0040] Specifically, when a magnetic device (i.e., a device to be charged that has a magnet and supports the magnetic charging protocol) is detected to be coupled with a magnetic resonant coil, the switch tube in the magnetic resonant inductor branch where the magnetic resonant coil is located is controlled to be turned on, and the switch unit 100 and the resonant capacitor unit 220 are configured so that the transmitter works in the magnetic charging mode. If a mobile phone with the MPP protocol is placed on the magnetic resonant coil, the transmitter works in the magnetic charging mode and can be charged at a high power of 15W or 25W or higher, that is, to meet the maximum power charging, and has the advantages of good magnetic charging and high efficiency.

[0041] Specifically, when a magnetic device is detected to be coupled with a non-magnetic resonant coil, the switch tube in the non-magnetic resonant inductor branch where the non-magnetic resonant coil is located is controlled to be turned on, and the switch unit 100 and the resonant capacitor unit 220 are configured so that the transmitter works in the non-magnetic charging mode. If a mobile phone with the MPP protocol is placed on the non-magnetic resonant coil, the transmitter works in the non-magnetic charging mode and can be charged at a relatively low charging power of 7.5W.

[0042] Specifically, when a non-magnetic device is detected to be coupled with a non-magnetic resonant coil, the switch tube in the non-magnetic resonant inductor branch where the non-magnetic resonant coil is located is controlled to be turned on, and the switch unit 100 and the resonant capacitor unit 220 are configured so that the transmitter works in the non-magnetic charging mode. If a non-magnetic mobile phone is placed on the non-magnetic resonant coil, it can be charged at a high power of 50W if it is a private protocol, and it can be charged at a power of 15W if it is EPP, which meets the maximum power charging.

[0043] Specifically, when it is detected that a non-magnetic device is coupled with a magnetic resonant coil, the switch tube in the magnetic resonant inductor branch where the magnetic resonant coil is located is controlled to be turned on, and the switch unit 100 and the resonant capacitor unit 220 are configured so that the transmitter operates in the non-magnetic charging mode.

[0044] In practical applications, the actual charging power of the above-mentioned magnetic charging mode and non-magnetic charging mode is not limited. This can be determined according to the type and model of the transmitter and the device to be charged, and the actual charging power can be determined according to technological development or charging needs.

[0045] It can be seen that whether it is a magnetic device or a non-magnetic device, and whether it is placed on a magnetic resonant coil or a non-magnetic resonant coil, it can be charged, which reduces the number of electronic products carried by users, which brings great convenience and excellent experience to users. In addition, in order to adapt to the development of the magnetic charging market, magnetic shells have emerged, and non-magnetic devices can also support magnetic charging protocols. From the application point of view, devices that currently do not have magnetic suction functions can be equipped with an external magnetic shell. In this way, if the device to be charged has a magnetic shell, it can be placed on the magnetic resonant coil for magnetic charging. If the device to be charged does not have a magnetic shell, it can be placed on a non-magnetic resonant coil for non-magnetic charging. It can be seen that the transmitter provided in this application is more flexible, and one transmitter can charge various types of devices to be charged.

[0046] From the above description, it can be seen that one magnetic resonant inductor branch and one non-magnetic resonant inductor branch can satisfy the function of charging both magnetic and non-magnetic devices. In order to further facilitate users, in actual applications, multiple magnetic resonant inductor branches and / or multiple non-magnetic resonant inductor branches can be set, that is, multiple magnetic resonant coils and / or multiple non-magnetic resonant coils can be set to increase the coverage of the transmitter output power and increase the user's freedom of charging. For example, when the user is in use, no matter where it is placed, the coil in the device to be charged can be coupled with a resonant coil in the transmitter to transmit power and realize charging. In some special use environments, such as when the placement space of the device to be charged is partially limited, the device to be charged can be placed in an unrestricted position, and the resonant coil at this position can be coupled with the coil in the device to be charged to realize power transmission and charging.

[0047] In practical applications, Figure 1 The transmitter shown can be applied to wireless charging of consumer electronics, such as mobile phones, watches, etc.

[0048] In practical applications, see Figure 2 The transmitter block diagram of another embodiment of the present application is shown in Figure 2 The transmitter shown also includes a filter unit 300, which includes a filter capacitor unit 310 and a filter inductor unit 320. The filter capacitor unit 310 is connected in parallel with the resonant cavity 200, and the filter inductor unit 320 is connected between the filter capacitor unit 310 and the switch unit 100, wherein the filter capacitor unit 310 includes a first filter capacitor branch and a second filter capacitor branch connected in parallel, the first filter capacitor branch includes a first filter capacitor Cp1 and a first filter control switch tube Qp1 connected in series, and the second filter capacitor branch includes a second filter capacitor Cp2 and a second filter control switch tube Qp2 connected in series.

[0049] In a specific implementation, when the transmitter is configured to work in a non-magnetic charging mode, the first filter control switch tube Qp1 and the second filter control switch tube Qp2 are both configured to be turned on; when the transmitter is configured to work in a magnetic charging mode, the second filter control switch tube Qp2 is configured to be turned on. That is, when the magnetic charging protocol is used as a magnetic charging protocol, a small-capacitance capacitor can be selected to access the circuit, such as only closing the second filter control switch tube Qp2 and only connecting the second filter capacitor Cp2 to the circuit. When used as a non-magnetic charging protocol for non-magnetic charging, a larger-capacitance capacitor is selected to access the circuit, such as closing the first filter control switch tube Qp1 and the second filter control switch tube Qp2 at the same time, connecting the first filter capacitor Cp1 and the second filter capacitor Cp2 in parallel and connecting them to the circuit. In this way, the gain requirements of the magnetic charging protocol and the non-magnetic charging protocol can be met respectively.

[0050] In practical applications, further, the first filter capacitor Cp1 may be selected to be larger than the second filter capacitor Cp2.

[0051] In practical applications, Figure 2 The transmitter shown can be applied to in-vehicle wireless charging to meet the requirements of in-vehicle EMI performance.

[0052] In practical applications, when arranging the magnetic attraction resonant coil and the non-magnetic attraction resonant coil, the magnetic attraction resonant coil and the non-magnetic attraction resonant coil can be separated in space, or the magnetic attraction resonant coil and the non-magnetic attraction resonant coil can at least partially overlap in space. For example, the transmitter includes two non-magnetic attraction resonant coils and one magnetic attraction resonant coil. Figure 3 The schematic diagram of the relative position arrangement between coils of an embodiment of the present application is shown, wherein reference numeral 211 is a non-magnetic resonant coil, reference numeral 212 is a magnetic resonant coil, and reference numeral 213 is a magnet. In (a), the magnetic resonant coil 212 is located between two non-magnetic resonant coils 211, and the magnetic resonant coil 212 and the two non-magnetic resonant coils 211 at least partially overlap in space, and the whole constitutes a wedge-shaped magnet. In (b), the two non-magnetic resonant coils 211 are arranged adjacent to each other, and the magnetic resonant coil 212 and a non-magnetic resonant coil 211 at least partially overlap in space, and the whole constitutes a C-shaped magnet. In (c), the two non-magnetic resonant coils 211 are arranged adjacent to each other, and the magnetic resonant coil 212 and the non-magnetic resonant coil 211 are spaced apart in space, and the whole constitutes a ring magnet. The above arrangement methods have their own advantages and disadvantages, and can be selected according to the design requirements.

[0053] The above is only used to illustrate the relative position relationship between coils. In actual transmitter product applications, the actual spatial position of each coil can be designed according to the actual product. For example, in an actual application scenario, for a car charger, the magnetic resonant coil can be arranged in a way that it is higher than the non-magnetic resonant coil in the vertical direction. Figure 4The schematic diagram of the arrangement of the coils in the vertical direction of an embodiment of the present application is shown, wherein reference numeral 211 is a non-magnetic resonant coil, reference numeral 212 is a magnetic resonant coil, and reference numeral 213 is a magnet. This allows when the device to be charged is placed on the transmitter, if it is a device to be charged with a magnetic suction function, it can be directly adsorbed on the top magnetic resonant coil when placed for magnetic charging; if it is a device to be charged without a magnetic suction function, it will fall into the range of the non-magnetic resonant coil located below due to the effect of gravity for non-magnetic charging. This greatly facilitates the driver's use and improves their safety.

[0054] In an embodiment of a practical application, please refer to Figure 5 The transmitter circuit schematic diagram of a specific embodiment of the present application is shown, the resonant cavity 200 includes a magnetic attraction resonant inductor branch and a non-magnetic attraction resonant inductor branch, the magnetic attraction resonant inductor branch is connected in parallel with the non-magnetic attraction resonant inductor branch, the magnetic attraction resonant inductor branch includes a magnetic attraction resonant coil Lpm and a magnetic attraction resonant inductor control switch tube Qm connected in series, and the non-magnetic attraction resonant inductor branch includes a non-magnetic attraction resonant coil Lpb and a non-magnetic attraction resonant inductor control switch tube Qb connected in series. The resonant capacitor unit 220 includes two capacitor branches connected in parallel to each other, the first capacitor branch includes a first resonant capacitor Cc1, and the second capacitor branch includes a second resonant capacitor Cc2 and a second resonant capacitor control switch tube Qc2 connected in series.

[0055] like Figure 5 As shown, a magnetic attraction resonant inductor branch and a non-magnetic attraction resonant inductor branch are connected in parallel to form a resonant inductor unit 210, and a resonant capacitor unit 220 and the resonant inductor unit 210 are connected in series at both ends of the switch unit 100. Specifically, when Figure 5 As shown, the switch unit 100 is a full-bridge switch unit 100 , and the resonant capacitor unit 220 and the resonant inductor unit 210 are connected in series between the common nodes SW1 and SW2 of the two bridge arms of the switch unit 100 .

[0056] like Figure 5 As shown, the first capacitor branch only includes a resonant capacitor, and the second capacitor branch includes a resonant capacitor and a second resonant capacitor control switch tube Qc2 as a gate switch tube. By controlling the gate switch tube in the second capacitor branch to meet the requirements of working in the magnetic charging mode or the non-magnetic charging mode and each stage therein, the resonant capacitor in the first capacitor branch is always connected.

[0057] In actual implementation, the first capacitor branch may also include a first resonant capacitor control switch tube connected in series with the first resonant capacitor Cc1 to select whether to connect the first resonant capacitor Cc1 to meet the needs of working in magnetic charging mode or non-magnetic charging mode and various stages therein.

[0058] For further application, please refer to Figure 6 The transmitter circuit diagram of another specific embodiment of the present application is shown in FIG. Figure 5 The difference is that the resonant capacitor unit 220 also includes a third capacitor branch and a fourth capacitor branch, the first capacitor branch to the fourth capacitor branch are connected in parallel, the third capacitor branch includes a third resonant capacitor Cc3 and a third resonant capacitor control switch tube Qc3 connected in series, and the fourth capacitor branch includes a fourth resonant capacitor Cc4 and a fourth resonant capacitor control switch tube Qc4 connected in series. The resonant inductor unit 210 includes a magnetic resonant inductor branch and two non-magnetic resonant inductor branches connected in parallel, such as Figure 5 As shown, the series-connected non-magnetic resonant coil Lpb1 and the non-magnetic resonant inductor control switch tube Qb1 form a non-magnetic resonant inductor branch, and the series-connected non-magnetic resonant coil Lpb2 and the non-magnetic resonant inductor control switch tube Qb2 form another non-magnetic resonant inductor branch. Figure 6 The resonant capacitor unit 220 can achieve better control effect, and the resonant inductor unit 210 can achieve higher charging freedom.

[0059] and Figure 6 The transmitter shown also includes Figure 2 The filter unit 300 shown in FIG. Figure 2 The same is not repeated here.

[0060] Specifically, in actual applications, if the device to be charged is coupled with the magnetic resonant coil and supports the magnetic charging protocol, the magnetic resonant inductor control switch tube Qm is configured to be turned on, and the second filter control switch tube Qp2 is configured to be turned on. At the same time, the switch unit 100 is configured so that the transmitter operates in the magnetic charging mode, and the capacitance of the resonant capacitor connected to the resonant capacitor unit 220 can be adjusted according to the different stages, different frequencies, and coupling coefficient with the magnetic device in the magnetic charging mode.

[0061] by Figure 6Taking the transmitter shown as an example, in one embodiment, when the transmitter operates in the handshake stage of the magnetic charging mode, the second resonant capacitor control switch tube Qc2 to the fourth resonant capacitor control switch tube Qc4 in the resonant capacitor unit 220 are controlled to be turned on, and the first resonant capacitor Cc1 to the fourth resonant capacitor Cc4 are all connected. In the power transmission stage, when the operating frequency of the switch unit 100 is relatively low, such as 128KHZ (the charging protocol is the BPP protocol at this time), all resonant capacitor control switch tubes can be controlled to be turned on, and all resonant capacitors are connected; when the operating frequency of the switch unit 100 is relatively high, such as 360KHZ (the charging protocol is the MPP protocol at this time), the capacitance of the connected resonant capacitor can be reduced. Specifically, when the coupling coefficient between the resonant coil in the device to be charged and the magnetic resonant coil is high, such as greater than or equal to 0.8, the second resonant capacitor control switch tube Qc2 can be controlled to be turned on, and other resonant capacitor control switch tubes can be turned off, so that the first resonant capacitor Cc1 and the second resonant capacitor Cc2 are connected in parallel. When the coupling coefficient between the resonant coil in the device to be charged and the magnetic resonant coil is low, such as less than 0.8, all resonant capacitor control switch tubes can be controlled to be turned off, so that only the first resonant capacitor Cc1 is connected. That is, according to different stages, different frequencies, and coupling coefficients with magnetic devices in the magnetic charging mode, the capacitance of the resonant capacitor connected in the resonant capacitor unit 220 is adjusted. The specific settings can be adjusted according to actual control requirements.

[0062] Specifically, in practical applications, if the device to be charged is coupled with one of the non-magnetic resonant coils, the non-magnetic resonant inductor control switch tube connected in series with the non-magnetic resonant coil is configured to be turned on (e.g., if the device to be charged is coupled with the non-magnetic resonant coil Lpb1, the non-magnetic resonant inductor control switch tube Qb1 is configured to be turned on), the first filter control switch tube Qp1 and the second filter control switch tube Qp2 are both configured to be turned on, and the switch unit 100 is configured to make the transmitter work in the non-magnetic charging mode, and the resonant capacitor connected to the resonant capacitor unit 220 can be adjusted according to the non-magnetic charging protocol. Figure 6 Taking the transmitter shown as an example, if the device to be charged is coupled with a non-magnetic resonant coil, according to the non-magnetic charging protocol, the second resonant capacitor can be controlled to control the switch tube Qc2 to be turned on, and the first resonant capacitor Cc1 and the second resonant capacitor Cc2 are connected in parallel to meet the requirements of the non-magnetic charging mode. The same can also be adjusted according to actual control requirements.

[0063] In practical applications, please refer to Figure 7 The transmitter circuit diagram of another specific embodiment of the present application is shown in FIG. Figure 6The difference is that there are n magnetic resonant inductor branches and n non-magnetic resonant inductor branches, the n magnetic resonant inductor branches are connected in parallel to form a magnetic resonant inductor unit 211, the n non-magnetic resonant inductor branches are connected in parallel to form a non-magnetic resonant inductor unit 212, and the magnetic resonant inductor unit 211 is connected in parallel with the non-magnetic resonant inductor unit 212. As mentioned above, this increases the coverage of the transmitter output power and increases the freedom of user charging.

[0064] certainly, Figure 5 and Figure 7 The transmitter shown may also include Figure 2 The connection relationship and working principle of the filter unit 300 shown are the same as those described above, and will not be repeated here. Figure 8 The transmitter circuit diagram of another specific embodiment of the present application is shown, a magnetic resonant inductor branch constitutes a magnetic resonant inductor unit; the resonant capacitor unit 220 includes a first capacitor unit 221, the first capacitor unit 221 is connected in series with the magnetic resonant inductor unit to form a magnetic resonant unit 231, the first capacitor unit 221 includes two capacitor branches connected in parallel to each other, the first capacitor branch includes a first resonant capacitor Cc1, and the second capacitor branch includes a second resonant capacitor Cc2 connected in series and a second resonant capacitor control switch tube Qc2. Figure 8 As shown, the resonant capacitor unit 220 also includes a resonant capacitor Cb connected in series with the non-magnetic resonant inductor branch, forming a non-magnetic branch formed by the non-magnetic resonant coil Lpb, the switch tube Qb and the resonant capacitor Cb being connected in series, and a non-magnetic branch forms a non-magnetic resonant unit 232, wherein the magnetic resonant unit 231 is connected in parallel with the non-magnetic resonant unit 232.

[0065] In addition, Figure 8 As shown, the magnetic attraction resonance unit 231 and the non-magnetic attraction resonance unit 232 are both connected to the two ends of the switch unit 100. Specifically, as Figure 8 As shown, when the switch unit 100 is a full-bridge switch unit 100 , the magnetic attraction resonance unit 231 and the non-magnetic attraction resonance unit 232 are both connected between the common nodes SW1 and SW2 of the two bridge arms of the switch unit 100 .

[0066] like Figure 8 As shown, the first capacitor branch only includes a resonant capacitor, and the second capacitor branch includes a resonant capacitor and a second resonant capacitor control switch tube Qc2 as a gate switch tube. By controlling the gate switch tube in the second capacitor branch to meet the requirements of working in the magnetic charging mode or the non-magnetic charging mode and each stage therein, the resonant capacitor in the first capacitor branch is always connected. In the non-magnetic charging mode, after the non-magnetic branch is gated, it is directly connected in series with the resonant capacitor, and no further control is required.

[0067] Similarly, in actual implementation, the first capacitor branch may also include a first resonant capacitor control switch tube connected in series with the first resonant capacitor Cc1 to meet the requirements of selecting whether to connect the first resonant capacitor Cc1 in order to work in the magnetic charging mode and its various stages.

[0068] For further application, please refer to Fig. 9 The transmitter circuit diagram of another specific embodiment of the present application is shown in FIG. Figure 8 The difference is that the resonant capacitor unit 220 also includes a third capacitor branch, the first capacitor branch to the third capacitor branch are connected in parallel, and the third capacitor branch includes a third resonant capacitor Cc3 and a third resonant capacitor control switch tube Qc3 connected in series. This can make the control effect better. And the non-magnetic resonant unit 232 includes two non-magnetic branches, one of which is formed by the non-magnetic resonant coil Lpb1, the switch tube Qb1 and the resonant capacitor Cb1 connected in series, and the other non-magnetic branch is formed by the non-magnetic resonant coil Lpb2, the switch tube Qb2 and the resonant capacitor Cb2 connected in series. This can make the charging freedom higher.

[0069] and Fig. 9 The transmitter shown also includes Figure 2 The filter unit 300 shown in FIG. Figure 2 The same is not repeated here.

[0070] Specifically, in actual applications, if the device to be charged is coupled with the magnetic resonant coil and supports the magnetic charging protocol, the magnetic resonant inductor control switch tube Qm is configured to be turned on, and the second filter control switch tube Qp2 is configured to be turned on. At the same time, the switch unit 100 is configured so that the transmitter operates in the magnetic charging mode, and the capacitance of the resonant capacitor connected to the first capacitor unit 221 can be adjusted according to different stages, different frequencies, and the coupling coefficient with the magnetic device in the magnetic charging mode.

[0071] by Fig. 9Taking the transmitter shown as an example, when the transmitter operates in the handshake stage of the magnetic charging mode, the second resonant capacitor control switch tube Qc2 and the third resonant capacitor control switch tube Qc3 in the first capacitor unit 221 are controlled to be turned on, and the first resonant capacitor Cc1 to the third resonant capacitor Cc3 are all connected. In the power transmission stage, when the operating frequency of the switch unit 100 is relatively low, such as 128KHZ (the charging protocol is the BPP protocol at this time), all resonant capacitor control switch tubes can be controlled to be turned on, and all resonant capacitors are connected; when the operating frequency of the switch unit 100 is relatively high, such as 360KHZ (the charging protocol is the MPP protocol at this time), the capacitance of the connected resonant capacitor can be reduced. Specifically, when the coupling coefficient between the resonant coil in the device to be charged and the magnetic resonant coil is high, such as greater than or equal to 0.8, the second resonant capacitor control switch tube Qc2 can be controlled to be turned on, and the third resonant capacitor control switch tube Qc3 can be turned off, so that the first resonant capacitor Cc1 and the second resonant capacitor Cc1 are connected in parallel. When the coupling coefficient between the resonant coil in the electrical device and the magnetic resonant coil is low, such as less than 0.8, all resonant capacitor control switch tubes can be controlled to be turned off, so that only the first resonant capacitor Cc1 is connected. That is, according to different stages, different frequencies, and coupling coefficients with magnetic devices in the magnetic charging mode, the capacitance of the resonant capacitor connected in the first capacitor unit 221 is adjusted. The specific settings can be adjusted according to actual control requirements.

[0072] Specifically, in practical applications, if the device to be charged is coupled with one of the non-magnetic resonant coils, the non-magnetic resonant inductor control switch tube connected in series with the non-magnetic resonant coil is configured to be turned on, the first filter control switch tube Qp1 and the second filter control switch tube Qp2 are both configured to be turned on, and the switch unit 100 is configured to make the transmitter work in the non-magnetic charging mode. If the device to be charged is coupled with the non-magnetic resonant coil Lpb1, the non-magnetic resonant inductor control switch tube Qb1 is configured to be turned on, and the non-magnetic resonant inductor Lpb1 and the resonant capacitor Cb1 resonate to charge the non-magnetic device.

[0073] In practical applications, please refer to Fig.10 The transmitter circuit diagram of another specific embodiment of the present application is shown in FIG. Fig. 9 The difference is that there are n magnetic resonant inductor branches and n non-magnetic resonant inductor branches, the n magnetic resonant inductor branches are connected in parallel, and then connected in series with the first capacitor unit 221 to form a magnetic resonant unit 231. The n non-magnetic resonant branches are connected in parallel to form a non-magnetic unit 232, and the magnetic resonant unit 231 is connected in parallel with the non-magnetic resonant unit 232. As above, this increases the coverage of the transmitter output power and increases the freedom of user charging.

[0074] certainly, Figure 8 and Fig.10 The transmitter shown may also include Figure 2 The connection relationship and working principle of the filter unit 300 shown are the same as those described above and will not be described in detail here.

[0075] As described above, the switch unit 110 is implemented as a full-bridge inverter switch unit, the first switch tube S1 and the second switch tube S2 are connected in series to form a first switch bridge arm, whose common node is SW1, the third switch tube S3 and the fourth switch tube S4 are connected in series to form a second switch bridge arm, whose common node is SW2, and the first switch bridge arm is connected in parallel with the second switch bridge arm for connecting the voltage source Vin. In actual implementation, the switch unit 110 can also be implemented as a half-bridge inverter switch unit or a multi-level inverter switch unit. The present application does not limit its specific structure, and any switch unit that can generate AC excitation is applicable to the present application.

[0076] In actual implementation, the capacitance of the above-mentioned capacitor can be selected according to actual needs, and this application does not limit it.

[0077] The present application also provides a control method for a transmitter in a wireless power transmission system, wherein the transmitter can refer to Figures 1 to 10 The transmitter includes a switch unit and a resonant cavity connected in cascade, the resonant cavity includes at least one magnetic resonant inductor branch and at least one non-magnetic resonant inductor branch, each magnetic resonant inductor branch includes a magnetic resonant coil and a switch tube connected in series, each non-magnetic resonant inductor branch includes a non-magnetic resonant coil and a switch tube connected in series, and a resonant capacitor unit for forming resonance with the magnetic resonant coil and the non-magnetic resonant coil. For details, please refer to the above description, which will not be repeated here.

[0078] See also Fig.11 The control method flow chart of the transmitter in the wireless power transmission system of one embodiment of the present application shown includes:

[0079] S1: Detect whether there is a device to be charged coupled with the resonant coil in the resonant cavity, if not, proceed to step S1, if yes, proceed to step S2;

[0080] S2: If the device to be charged is coupled with a magnetic resonant coil in the resonant cavity, determine whether the device to be charged supports magnetic charging, if so, proceed to step S21, if not, proceed to step S22;

[0081] S21: Controlling the switch tube in the magnetic attraction resonant inductor branch where the magnetic attraction resonant coil is located to be turned on, and configuring the switch unit and the resonant capacitor unit so that the transmitter works in the magnetic attraction charging mode;

[0082] S22: Controlling the switch tube in the magnetic attraction resonant inductor branch where the magnetic attraction resonant coil is located to be turned on, and configuring the switch unit and the resonant capacitor unit so that the transmitter works in a non-magnetic attraction charging mode;

[0083] S3: If the device to be charged is coupled with a non-magnetic resonant coil in the resonant cavity, the switch tube in the non-magnetic resonant inductor branch where the non-magnetic resonant coil is located is controlled to be turned on, and the switch unit and the resonant capacitor unit are configured so that the transmitter operates in the non-magnetic charging mode.

[0084] This makes the transmitter provided in this application compatible with charging both non-magnetic devices and magnetic devices.

[0085] Furthermore, the resonant capacitor unit includes a plurality of capacitor branches connected in series with the at least one magnetic resonant inductor branch, wherein the plurality of capacitor branches are connected in parallel, and at least one of the capacitor branches includes a resonant capacitor and a switch tube connected in series, wherein in step S21, the number of resonant capacitors connected to the plurality of capacitor branches is adjusted according to different stages, different frequencies, and the coupling coefficient with the magnetic device in the magnetic charging mode. Figures 5 to 7 , comprising a resonant capacitor unit 220 of a plurality of capacitor branches connected in parallel and a magnetic resonant inductor branch connected in series. Figures 8 to 10 , a first capacitor unit 221 including a plurality of capacitor branches connected in parallel is connected in series with a magnetic resonant inductor branch.

[0086] Furthermore, the multiple capacitor branches include a first capacitor branch, a second capacitor branch, a third capacitor branch and a fourth capacitor branch connected in parallel with each other, the first capacitor branch includes a first resonant capacitor, the second capacitor branch includes a second resonant capacitor and a second resonant capacitor control switch tube connected in series, the third capacitor branch includes a third resonant capacitor and a third resonant capacitor control switch tube connected in series, and the fourth capacitor branch includes a fourth resonant capacitor and a fourth resonant capacitor control switch tube connected in series, wherein in step S21, in the power transmission stage of magnetic charging, when the switch unit works at the first frequency, the second resonant capacitor control switch tube to the fourth resonant capacitor control switch tube are all turned on; when the switch unit works at the second frequency, the second frequency is greater than the first frequency, and the coupling coefficient between the resonant coil in the device to be charged and the magnetic resonant coil is judged. If the coupling is greater than or equal to a threshold value (such as 0.8), the second resonant capacitor control switch tube is controlled to be turned on, and the third resonant capacitor control switch tube and the fourth resonant capacitor control switch tube are turned off, otherwise the second resonant capacitor control switch tube to the fourth resonant capacitor control switch tube are all turned off. Please refer to Figure 6 and Figure 7 .

[0087] Furthermore, the at least one magnetic resonant inductor branch is connected in parallel with the at least one non-magnetic resonant inductor branch, and the multiple capacitor branches are also connected in series with the non-magnetic resonant inductor branch, wherein in step S3, the second resonant capacitor control switch tube is controlled to be turned on, and the third resonant capacitor control switch tube and the fourth resonant capacitor control switch tube are turned off. Figure 6 and Figure 7 .

[0088] Furthermore, the multiple capacitor branches include a first capacitor branch, a second capacitor branch and a third capacitor branch connected in parallel with each other, the first capacitor branch includes a first resonant capacitor, the second capacitor branch includes a second resonant capacitor and a second resonant capacitor control switch tube connected in series, the third capacitor branch includes a third resonant capacitor and a third resonant capacitor control switch tube connected in series, and the resonant capacitor unit also includes a resonant capacitor connected in series with each of the non-magnetic resonant inductor branches, wherein in step S21, in the power transmission stage of magnetic charging, when the switch unit works at the first frequency, the second resonant capacitor control switch tube and the third resonant capacitor control switch tube are controlled to be turned on; when the switch unit works at the second frequency, the coupling coefficient between the resonant coil and the magnetic resonant coil in the device to be charged is judged, and if the coupling is greater than or equal to a threshold value (such as 0.8), the second resonant capacitor control switch tube is controlled to be turned on and the third resonant capacitor control switch tube is turned off, otherwise the second resonant capacitor control switch tube and the third resonant capacitor control switch tube are controlled to be turned off, wherein the second frequency is greater than the first frequency. See also Fig. 9 and Fig.10 .

[0089] Although the embodiments of the present disclosure and its advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the disclosure as defined by the appended claims.

[0090] In addition, the scope of the present application is not intended to be limited to the specific embodiments of the processes, machines, manufactures, material compositions, devices, methods, and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure of this disclosure, processes, machines, manufactures, material compositions, means, methods, or steps that perform substantially the same functions currently exist or will later be developed or achieve substantially the same results as the corresponding embodiments described herein that can be used according to this disclosure. Therefore, the appended claims are intended to include such processes, machines, manufactures, material compositions, devices, methods, or steps within their scope.

Claims

1. A transmitter, applied to a wireless power transmission system, characterized in that: include: Switching unit; The resonant cavity is cascade-connected with the switch unit, and includes at least one magnetic resonant inductor branch and at least one non-magnetic resonant inductor branch, each of the magnetic resonant inductor branches includes a magnetic resonant coil and a switch tube connected in series, each of the non-magnetic resonant inductor branches includes a non-magnetic resonant coil and a switch tube connected in series, and a resonant capacitor unit for forming resonance with the magnetic resonant coil and the non-magnetic resonant coil. A switch tube in a magnetic resonant inductor branch is turned on, and the resonant capacitor unit is configured, so that the transmitter works in a magnetic charging mode to charge the magnetic device; a switch tube in a non-magnetic resonant inductor branch is turned on, and the resonant capacitor unit is configured, so that the transmitter works in a non-magnetic charging mode to charge the non-magnetic device.

2. The transmitter according to claim 1, characterized in that The device further comprises a filter unit, wherein the filter unit comprises a filter capacitor unit and a filter inductor unit, wherein the filter capacitor unit is connected in parallel with the resonant cavity, and the filter inductor unit is connected between the filter capacitor unit and the switch unit. Among them, the filter capacitor unit includes a first filter capacitor branch and a second filter capacitor branch connected in parallel, the first filter capacitor branch includes a first filter capacitor and a first filter control switch tube connected in series, and the second filter capacitor branch includes a second filter capacitor and a second filter control switch tube connected in series.

3. The transmitter according to claim 2, characterized in that When the transmitter is configured to operate in a non-magnetic charging mode, the first filter control switch tube and the second filter control switch tube are both configured to be turned on; When the transmitter is configured to operate in a magnetic charging mode, the second filter control switch tube is configured to be turned on.

4. The transmitter according to claim 1, characterized in that When it is detected that a magnetic attraction device is coupled with a magnetic attraction resonant coil, the switch tube in the magnetic attraction resonant inductor branch where the magnetic attraction resonant coil is located is controlled to be turned on, and the switch unit and the resonant capacitor unit are configured so that the transmitter works in the magnetic attraction charging mode; When it is detected that a magnetic device is coupled with a non-magnetic resonant coil, the switch tube in the non-magnetic resonant inductor branch where the non-magnetic resonant coil is located is controlled to be turned on, and the switch unit and the resonant capacitor unit are configured so that the transmitter works in the non-magnetic charging mode; When it is detected that a non-magnetic device is coupled with a non-magnetic resonant coil, the switch tube in the non-magnetic resonant inductor branch where the non-magnetic resonant coil is located is controlled to be turned on, and the switch unit and the resonant capacitor unit are configured so that the transmitter works in the non-magnetic charging mode; When it is detected that a non-magnetic device is coupled with a magnetic resonant coil, the switch tube in the magnetic resonant inductor branch where the magnetic resonant coil is located is controlled to be turned on, and the switch unit and the resonant capacitor unit are configured so that the transmitter operates in a non-magnetic charging mode.

5. The transmitter according to claim 1, characterized in that The magnetic attraction resonant coil is higher than the non-magnetic attraction resonant coil in a vertical direction.

6. The transmitter according to claim 1, characterized in that The at least one magnetic attraction resonant inductor branch and the at least one non-magnetic attraction resonant inductor branch are connected in parallel to form a resonant inductor unit; The resonant capacitor unit includes a plurality of capacitor branches connected in parallel with each other, wherein at least one of the capacitor branches includes a resonant capacitor and a switch tube connected in series, wherein the resonant inductor unit is connected in series with the resonant capacitor unit.

7. The transmitter according to claim 6, characterized in that The resonant capacitor unit comprises: A first capacitor branch includes a first resonant capacitor; The second capacitor branch includes a second resonant capacitor and a second resonant capacitor control switch tube connected in series.

8. The transmitter according to claim 6 or 7, characterized in that When the transmitter is configured to work in a magnetic charging mode, the capacitance of the resonant capacitor connected to the resonant capacitor unit is adjusted according to different stages, different frequencies, and the coupling coefficient with the magnetic device in the magnetic charging mode; When the transmitter is configured to operate in a non-magnetic charging mode, the resonant capacitor connected to the resonant capacitor unit is adjusted according to the non-magnetic charging protocol.

9. The transmitter according to claim 1, characterized in that The at least one magnetic attraction resonant inductor branch constitutes a magnetic attraction resonant inductor unit; The resonant capacitor unit includes a first capacitor unit, the first capacitor unit is connected in series with the magnetic resonant inductor unit to form a magnetic resonant unit, the first capacitor unit includes a plurality of capacitor branches connected in parallel with each other, at least one of the capacitor branches includes a resonant capacitor and a switch tube connected in series; The resonant capacitor unit also includes a resonant capacitor connected in series with each of the non-magnetic resonant inductor branches, and the non-magnetic resonant coil, the switch tube and the resonant capacitor are connected in series to form a non-magnetic branch, and at least one of the non-magnetic branches forms a non-magnetic resonant unit. The magnetic attraction resonance unit is connected in parallel with the non-magnetic attraction resonance unit.

10. The transmitter according to claim 9, characterized in that The first capacitor unit comprises: A first capacitor branch includes a first resonant capacitor; The second capacitor branch includes a second resonant capacitor and a second switch tube connected in series.

11. The transmitter according to claim 9 or 10, characterized in that When the transmitter is configured to operate in a magnetic charging mode, the resonant capacitor connected to the first capacitor unit is adjusted according to different stages, different frequencies, and a coupling coefficient with a magnetic device in the magnetic charging mode.

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