Emitter

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, in particular to a transmitter in a wireless power transmission system. BACKGROUND

[0002] With the development of technology, wireless power transmission has become an efficient and convenient mechanism to power or charge battery-based mobile devices such as mobile phones, tablets, digital cameras and the like.

[0003] A wireless power transmission system includes a transmitter and a receiver. When the receiver is placed within the output power range of the transmitter, a 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, i.e. 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] Current wireless power transmission systems are divided into non-magnetic attraction wireless charging systems and magnetic attraction wireless charging systems. The non-magnetic attraction wireless charging system uses a non-magnetic attraction charging protocol (such as the EPP protocol and a private high-power charging protocol) suitable for charging non-magnetic attraction devices to charge non-magnetic attraction devices. The magnetic attraction wireless charging system uses a magnetic attraction charging protocol (such as the MPP protocol) suitable for charging magnetic attraction devices to charge magnetic attraction devices.

[0005] However, there is currently no transmitter that can be compatible with charging non-magnetic attraction devices and charging magnetic attraction devices, which is inconvenient for users. UTILITY MODEL CONTENT

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

[0007] Further, the filter unit comprises a filter capacitor unit and a filter inductor unit, 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, wherein the filter capacitor unit comprises a first filter capacitor branch and a second filter capacitor branch connected in parallel, the first filter capacitor branch comprises a first filter capacitor and a first filter control switch tube connected in series, and the second filter capacitor branch comprises a second filter capacitor and a second filter control switch tube connected in series.

[0008] Further, when the transmitter is configured to work in the non-magnetic attraction 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 work in the magnetic attraction charging mode, the second filter control switch tube is configured to be turned on.

[0009] Further, 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 attraction device is coupled with a non-magnetic attraction resonant coil, the switch tube in the non-magnetic attraction resonant inductor branch where the non-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 non-magnetic attraction charging mode; when it is detected that a non-magnetic attraction device is coupled with a non-magnetic attraction resonant coil, the switch tube in the non-magnetic attraction resonant inductor branch where the non-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 non-magnetic attraction charging mode; when it is detected that a non-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 non-magnetic attraction charging mode.

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

[0011] Further, 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 comprises a plurality of capacitor branches connected in parallel with each other, at least one of the capacitor branches comprises a resonant capacitor and a switch tube connected in series, and the resonant inductor unit and the resonant capacitor unit are connected in series.

[0012] Further, the resonant capacitor unit comprises: a first capacitor branch comprising a first resonant capacitor; and a second capacitor branch comprising a second resonant capacitor and a second resonant capacitor control switch tube connected in series.

[0013] Further, when the transmitter is configured to work in the magnetic attraction charging mode, the resonant capacitance value of the resonant capacitance unit is adjusted according to different stages, different frequencies and coupling coefficients with the magnetic attraction device in the magnetic attraction charging mode; when the transmitter is configured to work in the non-magnetic attraction charging mode, the resonant capacitance of the resonant capacitance unit is adjusted according to the non-magnetic attraction charging protocol.

[0014] Further, the at least one magnetic attraction resonant inductance branch constitutes a magnetic attraction resonant inductance unit; the resonant capacitance unit comprises a first capacitance unit, the first capacitance unit is connected in series with the magnetic attraction resonant inductance unit to form a magnetic attraction resonant unit, the first capacitance unit comprises a plurality of capacitance branches connected in parallel with each other, wherein at least one of the capacitance branches comprises a resonant capacitance and a switch tube connected in series; the resonant capacitance unit further comprises a resonant capacitance connected in series with each non-magnetic attraction resonant inductance branch to form at least one non-magnetic attraction resonant coil, a switch tube and a resonant capacitance connected in series to form a non-magnetic attraction branch, and the at least one non-magnetic attraction branch forms a non-magnetic attraction resonant unit, wherein the magnetic attraction resonant unit and the non-magnetic attraction resonant unit are connected in parallel.

[0015] Further, the first capacitance unit comprises: a first capacitance branch comprising a first resonant capacitance; and a second capacitance branch comprising a second resonant capacitance and a second switch tube connected in series.

[0016] Further, when the transmitter is configured to work in the magnetic attraction charging mode, the resonant capacitance value of the resonant capacitance unit is adjusted according to different stages, different frequencies and coupling coefficients with the magnetic attraction device in the magnetic attraction charging mode; when the transmitter is configured to work in the non-magnetic attraction charging mode, the resonant capacitance of the resonant capacitance unit is adjusted according to the non-magnetic attraction charging protocol.

[0017] The foregoing has outlined rather broadly the features and technical advantages of the present disclosure so that it can be better understood in view of the following detailed description. Additional features and advantages of the present disclosure will be described in the detailed description which follows, and will be apparent to those of ordinary skill in the art. It should be appreciated by those skilled in the art that the concepts and specific embodiments disclosed can be readily utilized as a basis for modifying or designing other structures or processes for carrying out the same purposes of the present disclosure. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the disclosure as set forth in the appended claims. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0020] Figure 2A transmitter block diagram of another embodiment of the application is shown.

[0021] Figure 3 A schematic diagram of the relative position arrangement between coils of an embodiment of the application is shown.

[0022] Figure 4 A schematic diagram of the arrangement of coils in the vertical direction of an embodiment of the application is shown.

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

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

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

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

[0027] Figure 9 A transmitter circuit schematic diagram of another specific embodiment of the application is shown.

[0028] Figure 10 A transmitter circuit schematic diagram of another specific embodiment of the application is shown.

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

[0030] Unless otherwise indicated, corresponding numbers and symbols in different drawings generally refer to corresponding parts. The drawings are drawn to clearly illustrate relevant aspects of various embodiments and are not necessarily drawn to scale. DETAILED DESCRIPTION

[0031] The technical solutions in the application will be described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the application.

[0032] In an embodiment of the application, a transmitter is provided for use in a wireless power transmission system, which can be compatible with charging of non-magnetic attraction devices and charging of magnetic attraction devices. Please refer to Figure 1 A transmitter block diagram of an embodiment of the application is shown. The transmitter of the embodiment of the application comprises:

[0033] Switching unit 100;

[0034] The resonant cavity 200, cascaded with the switching unit 100, includes at least one magnetically attracted resonant inductor branch and at least one non-magnetically attracted resonant inductor branch. Each magnetically attracted resonant inductor branch includes a magnetically attracted resonant coil Lpm and a switching transistor Qm connected in series. Each non-magnetically attracted resonant inductor branch includes a non-magnetically attracted resonant coil Lpb and a switching transistor Qb connected in series. A resonant capacitor unit 220 is also included to resonate with both the magnetically attracted and non-magnetically attracted resonant coils.

[0035] The transmitter is configured to operate in a magnetic charging mode by turning on the switch in a magnetic resonant inductor branch and by configuring a resonant capacitor unit 220, thereby charging magnetic devices. The transmitter is also configured to operate in a non-magnetic resonant inductor branch by turning on the switch and by configuring a resonant capacitor unit 220, thereby charging non-magnetic devices.

[0036] As described above, the resonant inductor unit 210 of the resonant cavity 200 simultaneously provides a magnetic resonant coil and a non-magnetic resonant coil, as well as a resonant capacitor unit 220 for resonating with the magnetic and non-magnetic resonant coils. When charging a magnetically attracted device is required, a switch connected in series with the magnetically attracted resonant coil is turned on to select the magnetically attracted resonant coil; when charging a non-magnetically attracted device is required, a switch connected in series with the non-magnetically attracted resonant coil is turned on to select the non-magnetically attracted resonant coil. This allows the transmitter provided in this application to be compatible with charging both non-magnetically attracted and magnetically attracted devices.

[0037] For example, when the device to be charged is a non-magnetic device, it can be placed in the area of ​​the transmitter's non-magnetic resonant coil. The transmitter's controller will then activate the switch connected in series with the non-magnetic resonant coil to select it, allowing charging using a non-magnetic charging protocol (such as EPP or a proprietary high-power charging protocol). Conversely, when the device to be charged is a magnetic device, it can be placed in the area of ​​the transmitter's magnetic resonant coil. The transmitter's controller will then activate the switch connected in series with the magnetic resonant coil to select it, allowing charging using a magnetic charging protocol (such as MPP). As the above analysis shows, both magnetic and non-magnetic charging can achieve the same characteristics as existing magnetic and non-magnetic charging methods.

[0038] And as Figure 1 As shown, only one switching unit 100 is needed to drive the resonant cavity 200, which is compatible with both non-magnetic charging and magnetic charging, thus making the transmitter more integrated.

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

[0040] Specifically, when a magnetically attracted device (i.e., a device with a magnet and supporting the magnetic charging protocol) is detected to be coupled to a magnetically attracted resonant coil, the switching transistor in the magnetically attracted resonant inductor branch containing the magnetically attracted resonant coil is turned on, and the switching unit 100 and the resonant capacitor unit 220 are configured to make the transmitter work in magnetic charging mode. For example, if a mobile phone with the MPP protocol is placed on the magnetically attracted resonant coil, the transmitter will work in magnetic charging mode and can charge at a high power of 15W or 25W or higher, that is, meet the maximum power charging, and have the advantages of good attraction and high efficiency of magnetic charging.

[0041] Specifically, when a magnetic device is detected to be coupled to a non-magnetic resonant coil, the switch in the non-magnetic resonant inductor branch containing the non-magnetic resonant coil is turned on, and the switching unit 100 and the resonant capacitor unit 220 are configured to make the transmitter work in non-magnetic charging mode. For example, if a mobile phone with the MPP protocol is placed on the non-magnetic resonant coil, the transmitter will work in non-magnetic charging mode and can charge at a relatively low charging power of 7.5W.

[0042] Specifically, when a non-magnetic device is detected to be coupled to a non-magnetic resonant coil, the switching transistor in the non-magnetic resonant inductor branch containing the non-magnetic resonant coil is turned on, and the switching unit 100 and the resonant capacitor unit 220 are configured to make the transmitter work in 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 proprietary protocol, and at a power of 15W if it is an EPP, which meets the maximum power charging requirement.

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

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

[0045] Therefore, it is evident that both magnetic and non-magnetic devices can be charged, regardless of whether they are placed on a magnetic resonant coil or a non-magnetic resonant coil. This reduces the number of electronic devices users need to carry, providing significant convenience and a superior user experience. Furthermore, to meet the growing demand in the magnetic charging market, magnetic charging cases have emerged, enabling non-magnetic devices to also support magnetic charging protocols. From an application perspective, devices currently lacking magnetic functionality can be fitted with an external magnetic case. If the device has a magnetic case, it can be placed on the magnetic resonant coil for magnetic charging; otherwise, it can be placed on a non-magnetic resonant coil for non-magnetic charging. Thus, the transmitter provided in this application offers greater flexibility, allowing one transmitter to charge various types of devices.

[0046] As described above, one magnetic resonant inductor branch and one non-magnetic resonant inductor branch are sufficient to charge both magnetic and non-magnetic devices. To further facilitate users, in practical applications, multiple magnetic resonant inductor branches and / or multiple non-magnetic resonant inductor branches can be configured, i.e., multiple magnetic resonant coils and / or multiple non-magnetic resonant coils can be used to increase the transmitter's output power coverage and enhance user charging flexibility. For example, regardless of the device's location, the coil inside the device being charged can couple with a resonant coil within the transmitter to transfer power and achieve charging. This is particularly useful in special environments, such as when space is limited for the device, allowing it to be placed in an unrestricted location where the resonant coil can couple with the coil inside the device to achieve power transfer and charging.

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

[0048] In practical applications, please refer to Figure 2 The schematic diagram of the transmitter block diagram of another embodiment of this application shown herein is 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 switching unit 100. 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 Qp1 connected in series, and the second filter capacitor branch includes a second filter capacitor Cp2 and a second filter control switch Qp2 connected in series.

[0049] In practical implementation, when the transmitter is configured to operate in non-magnetic charging mode, both the first filter control switch Qp1 and the second filter control switch Qp2 are turned on; when the transmitter is configured to operate in magnetic charging mode, only the second filter control switch Qp2 is turned on. That is, when used as a magnetic charging protocol, a small-value capacitor can be selected for the circuit, such as closing only the second filter control switch Qp2 and connecting only the second filter capacitor Cp2 to the circuit. When used as a non-magnetic charging protocol, a larger-value capacitor is selected for the circuit, such as simultaneously closing both the first filter control switch Qp1 and the second filter control switch Qp2, connecting the first filter capacitor Cp1 and the second filter capacitor Cp2 in parallel to the circuit. This satisfies the gain requirements of both the magnetic charging protocol and the non-magnetic charging protocol.

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

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

[0052] In practical applications, when arranging magnetically attracted resonant coils and non-magnetically attracted resonant coils, the magnetically attracted resonant coils and non-magnetically attracted resonant coils can be spatially spaced apart, or they can at least partially overlap spatially. For example, if a transmitter includes two non-magnetically attracted resonant coils and one magnetically attracted resonant coil, please refer to [link to relevant documentation]. Figure 3 The diagram shows the relative arrangement of coils according to an embodiment of this application, where 211 is a non-magnetic resonant coil, 212 is a magnetic resonant coil, and 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, thus forming 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 one non-magnetic resonant coil 211 at least partially overlap in space, thus forming 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 spatially separated, thus forming a ring magnet. Each of the above arrangements has its advantages and disadvantages, and can be selected according to the design requirements.

[0053] The above is only for illustrating the relative positions of the coils. In actual transmitter applications, the actual spatial positions of each coil can be designed according to the specific product. For example, in a practical application scenario, such as a car charger, the magnetic resonant coils can be arranged vertically higher than the non-magnetic resonant coils. (See [reference needed]). Figure 4The diagram shown illustrates the vertical arrangement of coils according to an embodiment of this application, where 211 is a non-magnetic resonant coil, 212 is a magnetic resonant coil, and 213 is a magnet. This allows devices with magnetic attraction to be directly attracted to the uppermost magnetic resonant coil for magnetic charging when placed on the transmitter; devices without magnetic attraction will fall to the lower non-magnetic resonant coil for non-magnetic charging due to gravity. This greatly facilitates driver use and improves safety.

[0054] In one embodiment of a practical application, please refer to Figure 5 The schematic diagram of the transmitter circuit of a specific embodiment of this application shows that the resonant cavity 200 includes a magnetically attracted resonant inductor branch and a non-magnetically attracted resonant inductor branch. The magnetically attracted resonant inductor branch and the non-magnetically attracted resonant inductor branch are connected in parallel. The magnetically attracted resonant inductor branch includes a magnetically attracted resonant coil Lpm and a magnetically attracted resonant inductor control switch Qm connected in series. The non-magnetically attracted resonant inductor branch includes a non-magnetically attracted resonant coil Lpb and a non-magnetically attracted resonant inductor control switch Qb connected in series. The resonant capacitor unit 220 includes two capacitor branches connected in parallel. 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 Qc2 connected in series.

[0055] like Figure 5 As shown, a magnetically attracted resonant inductor branch and a non-magnetically attracted resonant inductor branch are connected in parallel to form a resonant inductor unit 210. A resonant capacitor unit 220 is connected in series with the resonant inductor unit 210 across the switching unit 100. Specifically, when... Figure 5 As shown, the switching unit 100 is a full-bridge switching 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 switching unit 100.

[0056] like Figure 5 As shown, the first capacitor branch includes only a resonant capacitor, and the second capacitor branch includes a resonant capacitor and a second resonant capacitor control switch Qc2, which serves as a selection switch. By controlling the selection switch in the second capacitor branch, the requirements of working in magnetic charging mode or non-magnetic charging mode and each stage therein are met, and 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 connected in series with the first resonant capacitor Cc1, so as 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] Furthermore, in practical applications, please refer to... Figure 6 The transmitter circuit diagram shown in another specific embodiment of this application is similar to... Figure 5 The difference lies in that the resonant capacitor unit 220 also includes a third capacitor branch and a fourth capacitor branch. The first to fourth capacitor branches are connected in parallel. The third capacitor branch includes a third resonant capacitor Cc3 and a third resonant capacitor control switch Qc3 connected in series. The fourth capacitor branch includes a fourth resonant capacitor Cc4 and a fourth resonant capacitor control switch Qc4 connected in series. The resonant inductor unit 210 includes one magnetically attracted resonant inductor branch and two non-magnetically attracted 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 Qb1 form one non-magnetic resonant inductor branch, and the series-connected non-magnetic resonant coil Lpb2 and the non-magnetic resonant inductor control switch Qb2 form another non-magnetic resonant inductor branch. Figure 6 The resonant capacitor unit 220 in the middle can improve the control effect, and the resonant inductor unit 210 can make the charging freedom greater.

[0059] and Figure 6 The transmitter shown also includes Figure 2 The filter unit 300 shown is connected to... Figure 2 The same applies, so I won't repeat it here.

[0060] Specifically, in practical applications, if the device to be charged is coupled to the magnetic resonant coil and supports the magnetic charging protocol, the magnetic resonant inductor control switch Qm is configured to be turned on, the second filter control switch Qp2 is configured to be turned on, and the switch unit 100 is configured to make the transmitter work in the magnetic charging mode. Furthermore, the capacitance value of the resonant capacitor connected in the resonant capacitor unit 220 can be adjusted according to different stages, different frequencies, and coupling coefficients 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 is working in the handshake stage of the magnetic charging mode, the second resonant capacitor control switch Qc2 to the fourth resonant capacitor control switch Qc4 in the control resonant capacitor unit 220 are all turned on, and the first resonant capacitor Cc1 to the fourth resonant capacitor Cc4 are all connected. During the power transfer phase, when the operating frequency of the switching unit 100 is low, such as 128kHz (when the charging protocol is BPP), all resonant capacitor control switches can be turned on, and all resonant capacitors are connected. When the operating frequency of the switching unit 100 is high, such as 360kHz (when the charging protocol is MPP), the capacitance value of the connected resonant capacitors can be reduced. Specifically, when the coupling coefficient between the resonant coil and the magnetic resonant coil in the device to be charged is high, such as greater than or equal to 0.8, the second resonant capacitor control switch Qc2 can be turned on, and the other resonant capacitor control switches 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 and the magnetic resonant coil in the device to be charged is low, such as less than 0.8, all resonant capacitor control switches can be turned off, so that only the first resonant capacitor Cc1 is connected. That is, the capacitance value of the resonant capacitors connected in the resonant capacitor unit 220 is adjusted according to different stages, different frequencies, and coupling coefficients with the magnetic device in the magnetic charging mode. The specific adjustments can be made according to actual control needs.

[0062] Specifically, in practical applications, if the device to be charged is coupled to one of the non-magnetic resonant coils, the non-magnetic resonant inductor control switch connected in series with that non-magnetic resonant coil is configured to be turned on (e.g., if the device to be charged is coupled to the non-magnetic resonant coil Lpb1, then the non-magnetic resonant inductor control switch Qb1 is configured to be turned on), the first filter control switch Qp1 and the second filter control switch Qp2 are both configured to be turned on, and the switching unit 100 is configured to make the transmitter work in non-magnetic charging mode, and the resonant capacitor connected in 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 to a non-magnetic resonant coil, according to the non-magnetic charging protocol, the second resonant capacitor control switch Qc2 can be turned on. Then, 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. Similarly, adjustments can be made according to actual control requirements.

[0063] In practical applications, please refer to further details. Figure 7 The transmitter circuit diagram shown in another specific embodiment of this application is similar to... Figure 6The difference lies in the fact that it has n magnetically resonant inductor branches and n non-magnetically resonant inductor branches. The n magnetically resonant inductor branches are connected in parallel to form a magnetically resonant inductor unit 211, and the n non-magnetically resonant inductor branches are connected in parallel to form a non-magnetically resonant inductor unit 212. Furthermore, the magnetically resonant inductor unit 211 and the non-magnetically resonant inductor unit 212 are connected in parallel as described above. This increases the range of the transmitter's output power and increases the user's freedom in charging.

[0064] certainly, Figure 5 and Figure 7 The transmitter shown may also include Figure 2 The filter unit 300 shown has the same connection relationship and working principle as described above, and will not be repeated here. In one embodiment of a practical application, please refer to... Figure 8 The transmitter circuit diagram shown in another specific embodiment of this application includes a magnetically attracted resonant inductor branch constituting a magnetically attracted resonant inductor unit; the resonant capacitor unit 220 includes a first capacitor unit 221, which is connected in series with the magnetically attracted resonant inductor unit to form a magnetically attracted resonant unit 231. The first capacitor unit 221 includes two capacitor branches connected in parallel. The first capacitor branch includes a first resonant capacitor Cc1, and the second capacitor branch includes a second resonant capacitor Cc2 connected in series. The second resonant capacitor controls the switch transistor 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 series connection of the non-magnetic resonant coil Lpb, the switch Qb and the resonant capacitor Cb. A non-magnetic branch forms a non-magnetic resonant unit 232, wherein the magnetic resonant unit 231 and the non-magnetic resonant unit 232 are connected in parallel.

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

[0066] like Figure 8 As shown, the first capacitor branch includes only a resonant capacitor, and the second capacitor branch includes a resonant capacitor and a second resonant capacitor control switch Qc2, which acts as a selection switch. By controlling the selection switch in the second capacitor branch, the requirements for operating in magnetic charging mode or non-magnetic charging mode, as well as the various stages therein, are met. The resonant capacitor in the first capacitor branch is always connected. In the non-magnetic charging mode, after the non-magnetic branch is selected, the resonant capacitor is directly connected in series, so no further control is needed.

[0067] Similarly, in actual implementation, the first capacitor branch may also include a first resonant capacitor control switch connected in series with the first resonant capacitor Cc1, so as to meet the requirement of selecting whether to connect the first resonant capacitor Cc1 to meet the needs of working in the magnetic charging mode and various stages therein.

[0068] Furthermore, in practical applications, please refer to... Figure 9 The transmitter circuit diagram shown in another specific embodiment of this application is similar to... Figure 8 The difference lies in the fact that the resonant capacitor unit 220 also includes a third capacitor branch, with the first capacitor branch connected in parallel to the third capacitor branch. The third capacitor branch includes a third resonant capacitor Cc3 connected in series and a third resonant capacitor control switch Qc3. This improves the control effect. Furthermore, the non-magnetic resonant unit 232 includes two non-magnetic branches: one formed by connecting the non-magnetic resonant coil Lpb1, the switch Qb1, and the resonant capacitor Cb1 in series; and the other formed by connecting the non-magnetic resonant coil Lpb2, the switch Qb2, and the resonant capacitor Cb2 in series. This allows for greater freedom in charging.

[0069] and Figure 9 The transmitter shown also includes Figure 2 The filter unit 300 shown is connected to... Figure 2 The same applies, so I won't repeat it here.

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

[0071] by Figure 9Taking the transmitter shown as an example, when the transmitter is working in the handshake stage of the magnetic charging mode, the second resonant capacitor control switch Qc2 and the third resonant capacitor control switch Qc3 in the first capacitor unit 221 are both turned on, and the first resonant capacitor Cc1 to the third resonant capacitor Cc3 are all connected. During the power transmission phase, when the operating frequency of the switching unit 100 is low, such as 128kHz (when the charging protocol is BPP), all resonant capacitor control switches can be turned on, and all resonant capacitors are connected. When the operating frequency of the switching unit 100 is high, such as 360kHz (when the charging protocol is MPP), the capacitance value of the connected resonant capacitors can be reduced. Specifically, when the coupling coefficient between the resonant coil and the magnetic resonant coil in the device to be charged is high, such as greater than or equal to 0.8, the second resonant capacitor control switch Qc2 can be turned on, and the third resonant capacitor control switch 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 and the magnetic resonant coil in the device is low, such as less than 0.8, all resonant capacitor control switches can be turned off, so that only the first resonant capacitor Cc1 is connected. That is, the capacitance value of the resonant capacitor connected in the first capacitor unit 221 is adjusted according to different stages, different frequencies, and coupling coefficients with the magnetic device in the magnetic charging mode. The specific adjustments can be made according to actual control needs.

[0072] Specifically, in practical applications, if the device to be charged is coupled to one of the non-magnetic resonant coils, the non-magnetic resonant inductor control switch connected in series with the non-magnetic resonant coil is configured to be turned on, and both the first filter control switch Qp1 and the second filter control switch Qp2 are configured to be turned on. Simultaneously, the switching unit 100 is configured to enable the transmitter to operate in non-magnetic charging mode. If the device to be charged is coupled to the non-magnetic resonant coil Lpb1, the non-magnetic resonant inductor control switch 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 further details. Figure 10 The transmitter circuit diagram shown in another specific embodiment of this application is similar to... Figure 9 The difference lies in the fact that it has n magnetically resonant inductor branches and n non-magnetically resonant inductor branches. The n magnetically resonant inductor branches are connected in parallel and then connected in series with the first capacitor unit 221 to form a magnetically resonant unit 231. The n non-magnetically resonant branches are connected in parallel to form a non-magnetically resonant unit 232, and the magnetically resonant unit 231 and the non-magnetically resonant unit 232 are connected in parallel as described above. This increases the coverage range of the transmitter's output power and increases the user's freedom in charging.

[0074] certainly, Figure 8 andFigure 10 The transmitter shown may also include Figure 2 The filter unit 300 shown has the same connection relationship and working principle as described above, and will not be repeated here.

[0075] As described above, the switching unit 110 is implemented as a full-bridge inverter switching unit. The first switch S1 and the second switch S2 are connected in series to form the first switching bridge arm, with their common node being SW1. The third switch S3 and the fourth switch S4 are connected in series to form the second switching bridge arm, with their common node being SW2. The first and second switching bridge arms are connected in parallel to connect to the voltage source Vin. In actual implementation, the switching unit 110 can also be implemented as a half-bridge inverter switching unit or a multi-level inverter switching unit. This application does not limit its specific structure; any switching unit capable of generating AC excitation is applicable to this application.

[0076] In practice, the capacitance value of the aforementioned capacitors can be selected according to actual needs, and this application does not impose any restrictions on it.

[0077] This application also provides a control method for a transmitter in a wireless power transmission system, wherein the transmitter can be found in [reference needed]. Figures 1 to 10 The transmitter includes cascaded switching units and a resonant cavity. The resonant cavity includes at least one magnetically attracted resonant inductor branch and at least one non-magnetically attracted resonant inductor branch. Each magnetically attracted resonant inductor branch includes a magnetically attracted resonant coil and a switching transistor connected in series. Each non-magnetically attracted resonant inductor branch includes a non-magnetically attracted resonant coil and a switching transistor connected in series, as well as a resonant capacitor unit for resonating with the magnetically attracted resonant coil and the non-magnetically attracted resonant coil. For details, please refer to the above description, which will not be repeated here.

[0078] Please see Figure 11 The flowchart shown here illustrates a control method for a transmitter in a wireless power transmission system according to an embodiment of this application, including:

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

[0080] S2: If the device to be charged is coupled to a magnetic resonant coil in the resonant cavity, determine whether the device to be charged supports magnetic charging. If yes, proceed to step S21; otherwise, proceed to step S22.

[0081] S21: Control the switching transistor in the magnetic resonant inductor branch where the magnetic resonant coil is located to turn on, and configure the switching unit and the resonant capacitor unit so that the transmitter works in magnetic charging mode;

[0082] S22: Control the switching transistor in the magnetic resonant inductor branch where the magnetic resonant coil is located to turn on, and configure the switching unit and the resonant capacitor unit so that the transmitter works in non-magnetic charging mode;

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

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

[0085] Furthermore, the resonant capacitor unit includes multiple capacitor branches connected in series with the at least one magnetic resonant inductor branch, wherein the multiple capacitor branches are connected in parallel, and at least one capacitor branch includes a resonant capacitor and a switching transistor connected in series. In step S21, the number of resonant capacitors connected in the multiple capacitor branches is adjusted according to different stages, frequencies, and coupling coefficients with the magnetic charging device under the magnetic charging mode. See also... Figures 5 to 7 This includes a resonant capacitor unit 220 comprising multiple capacitor branches connected in parallel, which is connected in series with a magnetically attracted resonant inductor branch. (See also...) Figures 8 to 10 The first capacitor unit 221, which includes multiple capacitor branches connected in parallel, is connected in series with the magnetic resonant inductor branch.

[0086] Furthermore, the plurality of capacitor branches include a first capacitor branch, a second capacitor branch, a third capacitor branch, and a fourth capacitor branch connected in parallel. 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 connected in series. The third capacitor branch includes a third resonant capacitor and a third resonant capacitor control switch connected in series. The fourth capacitor branch includes a fourth resonant capacitor and a fourth resonant capacitor control switch connected in series. In step S21, during the power transmission stage of magnetic charging, when the switching unit operates at a first frequency, all four resonant capacitor control switches are turned on. When the switching unit operates at a second frequency, which is greater than the first frequency, the coupling coefficient between the resonant coil and the magnetic resonant coil in the device to be charged is determined. If the coupling is greater than or equal to a threshold (e.g., 0.8), the second resonant capacitor control switch is turned on, and the third and fourth resonant capacitor control switches are turned off. Otherwise, all four resonant capacitor control switches are turned off. (See also...) Figure 6 and Figure 7 .

[0087] 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, and the plurality of capacitor branches are also connected in series with the non-magnetically attracted resonant inductor branch. In step S3, the second resonant capacitor control switch is turned on, and the third and fourth resonant capacitor control switches are turned off. (See also...) Figure 6 and Figure 7 .

[0088] Furthermore, the plurality of capacitor branches include a first capacitor branch, a second capacitor branch, and a third capacitor branch connected in parallel. 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 connected in series. The third capacitor branch includes a third resonant capacitor and a third resonant capacitor control switch connected in series. The resonant capacitor unit also includes a resonant capacitor connected in series with each of the non-magnetic resonant inductor branches. In step S21, during the power transmission stage of magnetic charging, when the switching unit operates at a first frequency, both the second and third resonant capacitor control switches are turned on. When the switching unit operates at a second frequency, the coupling coefficient between the resonant coil and the magnetic resonant coil in the device to be charged is determined. If the coupling is greater than or equal to a threshold (e.g., 0.8), the second resonant capacitor control switch is turned on and the third resonant capacitor control switch is turned off; otherwise, both the second and third resonant capacitor control switches are turned off. The second frequency is greater than the first frequency. (See also...) Figure 9 and Figure 10 .

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

[0090] Furthermore, the scope of this application is not intended to be limited to the specific embodiments of the processes, machines, manufactures, compositions of matter, apparatuses, methods, and steps described in the specification. As will be readily understood by those skilled in the art from the disclosure of this publication, processes, machines, manufactures, compositions of matter, means, methods, or steps that perform substantially the same function, currently exist or will be developed or implemented thereafter, will yield substantially the same results as the corresponding embodiments described herein that are available according to this disclosure. Therefore, the appended claims are intended to include such processes, machines, manufactures, compositions of matter, apparatuses, methods, or steps within their scope.

Claims

1. A transmitter used in a wireless power transmission system, characterized in that, include: Switching unit; The resonant cavity, cascaded with the switching unit, includes at least one magnetically attracted resonant inductor branch and at least one non-magnetically attracted resonant inductor branch. Each magnetically attracted resonant inductor branch includes a magnetically attracted resonant coil and a switching transistor connected in series. Each non-magnetically attracted resonant inductor branch includes a non-magnetically attracted resonant coil and a switching transistor connected in series. A resonant capacitor unit is also included to resonate with the magnetically attracted resonant coil and the non-magnetically attracted resonant coil. The transmitter is configured to operate in a magnetic charging mode by turning on a switch in a magnetic resonant inductor branch and by configuring the resonant capacitor unit, thereby charging magnetically attached devices. Conversely, the transmitter is configured to operate in a non-magnetically attached charging mode by turning on a switch in a non-magnetically attached resonant inductor branch and by configuring the resonant capacitor unit, thereby charging non-magnetically attached devices.

2. The transmitter according to claim 1, characterized in that, It also includes a filtering unit, which comprises 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. 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 connected in series. The second filter capacitor branch includes a second filter capacitor and a second filter control switch connected in series.

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

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

6. The transmitter according to claim 1, characterized in that, The at least one magnetically attracted resonant inductor branch and the at least one non-magnetically attracted resonant inductor branch are connected in parallel to form a resonant inductor unit; The resonant capacitor unit includes multiple capacitor branches connected in parallel, wherein at least one of the capacitor branches includes a resonant capacitor and a switching transistor 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 includes: The first capacitor branch includes the first resonant capacitor; The second capacitor branch includes a second resonant capacitor connected in series and a second resonant capacitor controlling the switching transistor.

8. The transmitter according to claim 6 or 7, characterized in that, When the transmitter is configured to operate in magnetic charging mode, the capacitance value of the resonant capacitor connected in the resonant capacitor unit is adjusted according to different stages, different frequencies, and coupling coefficient with the magnetic charging device in the magnetic charging mode. When the transmitter is configured to operate in non-magnetic charging mode, the resonant capacitor connected in 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 magnetically attracted resonant inductor branch constitutes a magnetically attracted resonant inductor unit; The resonant capacitor unit includes a first capacitor unit, which is connected in series with the magnetically attracted resonant inductor unit to form a magnetically attracted resonant unit. The first capacitor unit includes multiple capacitor branches connected in parallel with each other, wherein at least one of the capacitor branches includes a resonant capacitor and a switching transistor connected in series. The resonant capacitor unit also includes a resonant capacitor connected in series with each of the non-magnetic resonant inductor branches. The non-magnetic resonant coil, the switching transistor, and the resonant capacitor connected in series form a non-magnetic branch, and at least one of the non-magnetic branches forms a non-magnetic resonant unit. The magnetically attracted resonant unit is connected in parallel with the non-magnetically attracted resonant unit.

10. The transmitter according to claim 9, characterized in that, The first capacitor unit includes; The first capacitor branch includes the first resonant capacitor; The second capacitor branch includes a second resonant capacitor and a second switching transistor connected in series.

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

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