Transmitter, system temperature control method thereof and control chip

Abstract

The invention provides a transmitter, a system temperature control method thereof and a control chip, and the transmitter comprises a transmitter end conversion unit which is used for achieving power conversion; the transmitter coil is connected with the transmitter end conversion unit and is also used for being coupled with a receiver coil in a receiver in the magnetic attraction wireless power transmission system; the transmitter end magnet is used for being magnetically attracted with the receiver end magnet in the receiver; the emitter end temperature sensor is used for detecting the temperature of the emitter and outputting an emitter end temperature signal; the transmitter end control unit is configured to receive the transmitter end temperature signal and receive a receiver end temperature signal reflecting the temperature of the receiver through in-band communication; and outputting a temperature control signal for controlling the temperature of the magnetic attraction wireless power transmission system according to the transmitter end temperature signal and the receiver end temperature signal. Integrated control of temperature control is achieved, and the thermal control speed is increased.

Description

Technical Field

[0001] This application relates to the field of wireless power transmission, and more particularly to a transmitter, a method for controlling the temperature of its system, and a control chip. Background Technology

[0002] With further technological advancements, wireless power transfer has become an efficient and convenient mechanism for powering or charging battery-based mobile electronic devices such as mobile phones, tablets, digital cameras, MP3 players, and / or similar devices. Wireless power transfer systems typically include a transmitter 100 and a receiver.

[0003] Traditional wireless power transmission systems are non-magnetic wireless charging systems, with an air gap between the transmitter and receiver, meaning the transmitter and receiver are two independent thermal physical units. In practical temperature control, the transmitter and receiver can detect their own temperature and regulate it independently.

[0004] With the release of the Qi 2.0 wireless charging standard, more wireless charging technologies are adopting magnetic charging. In magnetic wireless charging, both the transmitter and receiver include magnets, which are tightly joined together during charging to form a single thermophysical unit. During wireless charging, the transmitter and receiver not only transmit electrical signals but also transfer heat to each other. If the traditional method of separate temperature regulation for the transmitter and receiver is still used, one might become a heat source for the other if its temperature is too high, making it difficult to accurately control the temperature of both the transmitter and receiver or reduce the speed of thermal control, potentially affecting their performance and efficiency.

[0005] Therefore, the industry urgently needs a temperature control strategy for magnetic wireless power transmission systems to effectively control the temperature of these systems. Summary of the Invention

[0006] According to one embodiment, a transmitter in a magnetic wireless power transmission system is provided, comprising: a transmitter-side conversion unit for power conversion; a transmitter coil connected to the transmitter-side conversion unit and further configured to couple with a receiver coil within a receiver in the magnetic wireless power transmission system; a transmitter-side magnet for magnetic attraction with a receiver-side magnet within the receiver; a transmitter-side temperature sensor for detecting the temperature of the transmitter and outputting a transmitter-side temperature signal; and a transmitter-side control unit configured to receive the transmitter-side temperature signal and receive a receiver-side temperature signal reflecting the temperature of the receiver via in-band communication, and output a temperature control signal for controlling the temperature of the magnetic wireless power transmission system based on the transmitter-side temperature signal and the receiver-side temperature signal.

[0007] Furthermore, the temperature control signal includes at least one of a first control signal for controlling the transmitter-side conversion unit and a second control signal for controlling the receiver, wherein the first control signal is used to control the output power of the transmitter, and the second control signal is used to control the output power of the receiver, wherein the second control signal is transmitted from the transmitter-side control unit to the receiver via the in-band communication.

[0008] Furthermore, when either the transmitter temperature signal or the receiver temperature signal is greater than or equal to a temperature control set threshold and less than a first threshold, the temperature control signal includes the first control signal; when either the transmitter temperature signal or the receiver temperature signal is greater than or equal to the first threshold, the temperature control signal includes the first control signal and the second control signal.

[0009] Furthermore, the transmitter also includes a cooling unit; wherein the temperature control signal may further include a third control signal for controlling the cooling unit.

[0010] Furthermore, if the charging speed of the receiver is given priority, when either the transmitter temperature signal or the receiver temperature signal is greater than or equal to a temperature control set threshold and less than a second threshold, the temperature control signal includes the third control signal; when either the transmitter temperature signal or the receiver temperature signal is greater than or equal to the second threshold and less than a third threshold, the temperature control signal includes the third control signal and the second control signal; when either the transmitter temperature signal or the receiver temperature signal is greater than or equal to the third threshold, the temperature control signal includes the first control signal, the second control signal, and the third control signal.

[0011] Furthermore, if the cooling speed of the magnetic wireless power transmission system is given priority, when either the transmitter-side temperature signal or the receiver-side temperature signal is greater than or equal to a temperature control set threshold and less than a fourth threshold, the temperature control signal includes the first control signal; when either the transmitter-side temperature signal or the receiver-side temperature signal is greater than or equal to the fourth threshold and less than a fifth threshold, the temperature control signal includes the first control signal and the third control signal; when either the transmitter-side temperature signal or the receiver-side temperature signal is greater than or equal to the fifth threshold, the temperature control signal includes the first control signal, the second control signal, and the third control signal.

[0012] Furthermore, the transmitter also includes a cooling unit, and the temperature control signal includes a third control signal for controlling the cooling unit.

[0013] Furthermore, when either the transmitter-side temperature signal or the receiver-side temperature signal is greater than or equal to a temperature control set threshold, the temperature control signal includes the second control signal, which is used to control the output power of the receiver. The second control signal is transmitted from the transmitter-side control unit to the receiver via the in-band communication.

[0014] Furthermore, when the transmitter end temperature signal indicates that the temperature at a certain location of the transmitter is higher than a set value, the transmitter end control unit outputs an indication signal that there is a foreign object at that location of the transmitter.

[0015] Furthermore, when the temperature signal received by the transmitter control unit from the receiver indicates that the temperature at a certain location of the receiver is higher than a set value, the transmitter control unit outputs an indication signal that there is a foreign object at that location of the receiver.

[0016] Furthermore, the temperature signal packet of the in-band communication includes a header portion and a data portion.

[0017] Furthermore, the transmitter-side control unit and the receiver exchange a temperature control handshake protocol, wherein the temperature of the magnetic wireless power transmission system is controlled by either the transmitter or the receiver according to the temperature control handshake protocol.

[0018] This application also provides a method for controlling the temperature of a magnetic wireless power transmission system by a transmitter, comprising: S1: receiving a transmitter-end temperature signal reflecting the temperature of the transmitter, and receiving a receiver-end temperature signal reflecting the temperature of a receiver in the magnetic wireless power transmission system via in-band communication; S2: outputting a temperature control signal for controlling the temperature of the magnetic wireless power transmission system based on the transmitter-end temperature signal and the receiver-end temperature signal.

[0019] Furthermore, the temperature control signal includes at least one of a first control signal for controlling the transmitter-side conversion unit and a second control signal for controlling the receiver, wherein the first control signal is used to control the output power of the transmitter, and the second control signal is used to control the output power of the receiver, wherein the second control signal is transmitted from the transmitter-side control unit to the receiver via the in-band communication.

[0020] Furthermore, in step S2, when either the transmitter temperature signal or the receiver temperature signal is greater than or equal to a temperature control set threshold and less than a first threshold, the temperature control signal includes the first control signal; when either the transmitter temperature signal or the receiver temperature signal is greater than or equal to the first threshold, the temperature control signal includes the first control signal and the second control signal.

[0021] Furthermore, the transmitter also includes a cooling unit; wherein, the temperature control signal may further include a third control signal for controlling the cooling unit; if the charging speed of the receiver is given priority, in step S2, when either the transmitter-side temperature signal or the receiver-side temperature signal is greater than or equal to a temperature control set threshold and less than a second threshold, the temperature control signal includes the third control signal; when either the transmitter-side temperature signal or the receiver-side temperature signal is greater than or equal to the second threshold and less than the third threshold, the temperature control signal includes the third control signal and the second control signal; when either the transmitter-side temperature signal or the receiver-side temperature signal is greater than or equal to the third threshold, the temperature control signal includes the first control signal, the second control signal, and the third control signal.

[0022] Furthermore, the transmitter also includes a cooling unit; wherein the temperature control signal may further include a third control signal for controlling the cooling unit; if the cooling speed of the magnetic wireless power transmission system is given priority, in step S2, when either the transmitter-side temperature signal or the receiver-side temperature signal is greater than or equal to a temperature control set threshold and less than a fourth threshold, the temperature control signal includes the first control signal; when either the transmitter-side temperature signal or the receiver-side temperature signal is greater than or equal to the fourth threshold and less than a fifth threshold, the temperature control signal includes the first control signal and the third control signal; when either the transmitter-side temperature signal or the receiver-side temperature signal is greater than or equal to the fifth threshold, the temperature control signal includes the first control signal, the second control signal, and the third control signal.

[0023] Furthermore, the transmitter also includes a cooling unit; in step S2, the temperature control signal includes a third control signal for controlling the cooling unit.

[0024] This application also provides a control chip for performing the above-described method of controlling the temperature of a transmitter-controlled magnetic wireless power transmission system.

[0025] Furthermore, when the temperature signal at the transmitter indicates that the temperature at a certain location of the transmitter is higher than a set value, the control chip outputs an indication signal that there is a foreign object at that location of the transmitter.

[0026] Furthermore, when the temperature signal at the receiver indicates that the temperature at a certain location of the receiver is higher than a set value, the control chip outputs an indication signal that there is a foreign object at that location of the receiver.

[0027] The features and technical advantages of this disclosure have been outlined quite extensively above to facilitate a better understanding of the detailed description that follows. Additional features and advantages of this disclosure, which form the subject matter of the claims, will be described below. Those skilled in the art will understand that the disclosed concepts and specific embodiments can be readily used as the basis for modifying or designing other structures or processes to achieve the same purpose as this disclosure. Those skilled in the art will also recognize that such equivalent structures do not depart from the spirit and scope of this disclosure as set forth in the appended claims. Attached Figure Description

[0028] To gain a more complete understanding of this disclosure and its advantages, the following description is provided in conjunction with the accompanying drawings, wherein:

[0029] Figure 1 A schematic diagram of a transmitter in a wireless power transmission system according to an embodiment of this application is shown;

[0030] Figure 2 This diagram illustrates the data format of a typical in-band communication signal packet.

[0031] Figure 3 A schematic diagram of a magnetic wireless power transmission system according to an embodiment of this application is shown;

[0032] Figure 4 A schematic diagram of a magnetic wireless power transmission system for temperature control is shown in one embodiment of the first embodiment of this application.

[0033] Figure 5 A schematic diagram of a magnetic wireless power transmission system for temperature control is shown in another embodiment of the first embodiment of this application.

[0034] Figure 6 A schematic diagram of a magnetic wireless power transmission system according to another embodiment of this application is shown;

[0035] Figure 7 A schematic diagram of a magnetic wireless power transmission system for temperature control is shown in one embodiment of the second embodiment of this application.

[0036] Figure 8A schematic diagram of a magnetic wireless power transmission system for temperature control is shown in another embodiment of the second embodiment of this application.

[0037] Figure 9 A flowchart illustrating a method for controlling the temperature of a transmitter-controlled magnetic wireless power transmission system according to an embodiment of this application is shown.

[0038] Figure 10 A schematic diagram of a receiver in a wireless power transmission system according to an embodiment of this application is shown;

[0039] Figure 11 A schematic diagram of a magnetic wireless power transmission system for temperature control according to a third embodiment of this application is shown.

[0040] Figure 12 A schematic diagram of a magnetic wireless power transmission system for temperature control according to the fourth embodiment of this application is shown.

[0041] Figure 13 A schematic diagram of a magnetic wireless power transmission system for temperature control is shown in another embodiment of the fourth embodiment of this application.

[0042] Unless otherwise stated, corresponding numbers and symbols in the various figures generally refer to corresponding parts. These figures are drawn to clearly illustrate relevant aspects of the various embodiments and are not necessarily drawn to scale. Detailed Implementation

[0043] The following discusses in detail the making and use of the present preferred embodiments. However, it should be understood that this disclosure provides many applicable inventive concepts that can be embodied in various specific contexts. The specific embodiments discussed are merely illustrative of specific ways of making and using the invention and do not limit the scope of the invention.

[0044] One embodiment of this application provides a transmitter 100 in a wireless power transmission system. See also... Figure 1 The schematic diagram of a transmitter in a wireless power transmission system according to an embodiment of this application shown includes:

[0045] The transmitter-side conversion unit 110 is used to implement power conversion;

[0046] The transmitter coil L1 is connected to the transmitter-end conversion unit 110 and is also used to couple with the receiver coil in the receiver of the magnetic wireless power transmission system.

[0047] The transmitter magnet 130 is used to magnetically attract the receiver magnet inside the receiver.

[0048] The transmitter-side temperature sensor 140 is used to detect the temperature of the transmitter and output the transmitter-side temperature signal Ttx.

[0049] The transmitter-side control unit 150 is configured to receive the transmitter-side temperature signal Ttx and receive the receiver-side temperature signal Trx reflecting the temperature of the receiver via in-band communication, and output a temperature control signal Ct to control the temperature of the magnetic wireless power transmission system based on the transmitter-side temperature signal Ttx and the receiver-side temperature signal Trx.

[0050] As described above, the transmitter-side control unit 150 receives not only the transmitter-side temperature signal Ttx but also the receiver-side temperature signal Trx, which reflects the receiver's temperature. Therefore, the output temperature control signal Ct considers both the transmitter 100's temperature and the receiver's temperature, thus treating the transmitter 100 and receiver as a whole for temperature control, achieving integrated temperature control. This avoids the problem of one component becoming a heat source for the other, or ensures that the temperature difference remains within an acceptable range. It not only accurately controls the temperatures of both the transmitter 100 and receiver but also improves the speed of thermal control, thereby enhancing the performance and efficiency of both the transmitter 100 and receiver.

[0051] We know that in a wireless power transmission system, transmitter 100 includes transmitter coil L1, and receiver includes receiver coil L2. Transmitter coil L1 and receiver coil L2 can form a loosely coupled transformer, through which power transmission is generated between transmitter 100 and receiver. Furthermore, the transmitter 100 and receiver transmit electrical signals via in-band communication, which is applicable to both magnetic charging systems and non-magnetic charging systems.

[0052] Specifically, both the transmitter 100 and the receiver include a communication modulator and demodulator, which provide in-band communication between the receiver and the transmitter 100 in the wireless power transmission system. For example, when a signal is transmitted from the transmitter 100 to the receiver, the communication modulator and demodulator in the transmitter 100 and the receiver are designed based on Frequency Shift Keying (FSK) modulation used in the wireless power transmission system; when a signal is transmitted from the receiver to the transmitter 100, the communication modulator and demodulator in the transmitter 100 and the receiver are designed based on Amplitude Shift Keying (ASK) modulation used in the wireless power transmission system.

[0053] Frequency shift keying (FSK) modulation and amplitude shift keying (ASK) modulation are both commonly used methods in wireless power transmission systems, and wireless power transmission systems have corresponding hardware circuits, which will not be described in detail here.

[0054] As described above, the transmitter-side control unit 150 also receives the receiver-side temperature signal Trx, which reflects the temperature of the receiver, via in-band communication. Therefore, the transmission of the temperature signal is integrated into the electrical signal transmission process between the receiver and transmitter 100, and the hardware circuitry used for electrical signal transmission is reused. Thus, this application, without increasing costs, utilizes existing electrical signal communication mechanisms to simultaneously transmit the electrical signal and the temperature signal, without altering the hardware circuitry, thereby eliminating the additional costs and design costs associated with hardware circuitry.

[0055] Specifically, in actual transmission, temperature signals use the same data format as electrical signals. Specifically, each signal packet includes a header and a data portion; the only difference is the header identifier used to distinguish between electrical and temperature signals, and the data portion uses different conversion methods to obtain the corresponding temperature or electrical signal.

[0056] Please see Figure 2 The diagram illustrates a typical in-band communication signal packet data format, comprising a preamble section 1, a header section 2, a data section 3, and a checksum section 4. The preamble section 1 signals the start of data transmission, and the checksum section 4 stores the value calculated according to a predetermined algorithm. When transmitting electrical signals, the header section 2 indicates the type and size of the electrical signal data packet, and the data section 3 specifies the calculation method for the electrical signal. When transmitting temperature signals, the header section 2 indicates the type and size of the temperature signal data packet, and the data section 3 specifies the calculation method for the temperature signal. Therefore, for transmitting electrical and temperature signals, this application does not require changes to the hardware circuitry or mechanism of in-band communication, resulting in low design costs.

[0057] We know that the wireless power transmission system also includes a receiver 200 coupled to the transmitter 100, see reference. Figure 3 The schematic diagram of a magnetic wireless power transmission system according to an embodiment of this application shows that the receiver 200 includes a receiver-side conversion unit 210 for power conversion; a receiver coil L2 connected to the receiver-side conversion unit 210 and also used for coupling with the transmitter coil L1 in the transmitter 100; a receiver-side magnet 230 for magnetic attraction with the transmitter-side magnet 130 in the transmitter 100; a receiver-side temperature sensor 240 for detecting the temperature of the receiver 200 and outputting a receiver-side temperature signal Trx; and a receiver-side control unit 250 for outputting control signals.

[0058] like Figure 1 and Figure 3 As shown, the transmitter-side conversion unit 110 is also connected to a power source to receive electrical energy. This application does not limit the specific type of power source.

[0059] like Figure 3As shown, the receiver 200 also includes a battery, and the receiver-side conversion unit 210 is connected to the battery for charging the battery.

[0060] like Figure 3 As shown, during wireless charging, when the receiver 200 is placed in a predetermined position, the transmitter magnet 130 and the receiver magnet 230 are magnetically attracted together, making the transmitter 100 and the receiver 200 a physical unit. At the same time, the transmitter coil L1 and the receiver coil L2 form a loosely coupled transformer. The transmitter-side conversion unit 110 converts the electrical energy received from the power source and transmits it to the transmitter coil L1. Then, it is coupled to the receiver coil L2 through the loosely coupled transformer formed between the transmitter coil L1 and the receiver coil L2. The receiver-side conversion unit 210 then performs power conversion to generate electrical energy suitable for charging the battery, thereby realizing power transmission between the transmitter 100 and the receiver 200 and charging the battery in the receiver 200.

[0061] from Figure 3 It is understood that the transmitter 100 and receiver 200 are attracted by magnets, making the wireless power transmission system a unified thermophysical unit. Therefore, the temperature of the magnetic wireless power transmission system can be controlled by controlling the temperature of the transmitter 100 or the receiver 200, or by controlling the temperatures of both simultaneously. That is, the temperature control signal for controlling the temperature of the magnetic wireless power transmission system can be a temperature control signal controlling the temperature of the transmitter 100, a temperature control signal controlling the temperature of the receiver 200, or a temperature control signal controlling the temperatures of both simultaneously.

[0062] The following specific embodiments will illustrate the specific method of temperature control in the magnetic wireless power transmission system of this application.

[0063] See also Figure 4 The diagram shows a magnetic wireless power transmission system for temperature control according to an embodiment of the first embodiment of this application. In one embodiment of the first embodiment, the temperature control signal Ct includes at least one of a first control signal Ct1 controlling the transmitter-side conversion unit 110 and a second control signal Ct2 controlling the receiver 200, wherein the first control signal Ct1 is used to control the output power of the transmitter 100, and the second control signal Ct2 is used to control the output power of the receiver 200, wherein the second control signal Ct2 is transmitted from the transmitter-side control unit 150 to the receiver 200 via in-band communication.

[0064] We know that the heat generated by the converter can be controlled by controlling the output power of the converter. Therefore, the temperature control signal Ct of this application can control the heat generated by the transmitter 100 and / or receiver 200 by controlling the output power of the transmitter 100 and / or receiver 200, thereby fundamentally controlling the generation of heat and achieving fast control speed.

[0065] In temperature control, the temperature at the transmitter 100 end and the temperature at the receiver end are considered simultaneously. The temperature control signal Ct can also control the transmitter 100 and the receiver, or one of them, thus realizing integrated control of the temperature control of the transmitter 100 and the receiver 200.

[0066] In actual implementation, the second control signal Ct2 can control the output power of the receiver 200 by controlling the receiver-side conversion unit 210. Specifically, the second control signal Ct2 is transmitted from the transmitter-side control unit 150 to the receiver-side control unit 250 via in-band communication (such as FSK), and the receiver-side control unit 250 outputs a control signal to control the operation of the receiver-side conversion unit 210 according to the second control signal Ct2.

[0067] As described above, the second control signal Ct2 is transmitted from the transmitter control unit 150 to the receiver 200 via in-band communication. That is, the in-band communication also transmits control signals simultaneously. Similar to the temperature signal transmission, the control signals use the same data format as the electrical signals. The difference is that when transmitting control signals, header section 2 indicates the type and size of the control signal data packets, and data section 3 indicates the calculation method of the control signal.

[0068] In a specific embodiment of the first embodiment, when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to a temperature control set threshold and less than a first threshold, the temperature control signal Ct includes a first control signal Ct1; when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the first threshold, the temperature control signal Ct includes a first control signal Ct1 and a second control signal Ct2.

[0069] Specifically, when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to a temperature control set threshold but less than a first threshold, the temperature control signal Ct becomes only the first control signal Ct1. In this case, the temperature is controlled solely by controlling the output power of the transmitter 100. Specifically, this involves reducing the output power of the transmitter 100. When either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the first threshold, the temperature control signal Ct becomes both the first control signal Ct1 and the second control signal Ct2. In this case, the temperature is controlled by simultaneously controlling the output power of both the transmitter 100 and the receiver 200. This ensures that the output power of the receiver 200 is maintained to meet user needs. When reducing the output power of the transmitter 100 alone is insufficient to reduce the temperature of the wireless power transmission system, the temperature is then controlled by simultaneously reducing the output power of both the transmitter 100 and the receiver 200.

[0070] Figure 5 A schematic diagram of a magnetic wireless power transmission system for temperature control is shown in another embodiment of the first embodiment of this application. In this other embodiment of the first embodiment, when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to a temperature control set threshold, the temperature control signal Ct is the second control signal Ct2. We know that in a magnetic wireless power transmission system, power coupling between the receiver coil L2 and the transmitter coil L1 is achieved through coupling between the receiver coil L2 and the transmitter coil L1. Therefore, by controlling the output power of the receiver 200, the output power of the transmitter 100 can be changed accordingly. Thus, the second control signal Ct2 can not only directly control the temperature of the receiver 200 but also indirectly control the temperature of the transmitter 100.

[0071] Please see Figure 6 The schematic diagram of another embodiment of the magnetic wireless power transmission system shown in this application is similar to... Figure 3 The difference lies in that the transmitter 100 also includes a cooling unit 160, which is used to dissipate heat from the transmitter 100. In one embodiment, the cooling unit 160 can be an air-cooled cooling unit, and the efficiency of heat dissipation from the transmitter 100 can be controlled by controlling the rotation speed of the air-cooled cooling unit. In another embodiment, the cooling unit 160 can be a semiconductor cooler. A semiconductor cooler uses a specific semiconductor material to form a PN junction, creating a thermocouple pair. By connecting a direct current, energy transfer is generated, achieving a cooling effect. The efficiency of heat dissipation from the transmitter 100 can then be controlled by controlling the current flowing through the semiconductor cooler.

[0072] See also Figure 7The diagram shows a schematic of a magnetic wireless power transmission system for temperature control according to an embodiment of the second embodiment of this application. In the second embodiment, for the transmitter 100 including the cooling unit 160, the temperature control signal Ct includes a third control signal Ct3 for controlling the cooling unit 160. When the transmitter-side control unit 150 determines that the temperature of the magnetic wireless power transmission system needs to be controlled based on the transmitter-side temperature signal Ttx and the receiver-side temperature signal Trx, the temperature control signal Ct is made to be the third control signal Ct3. For example, the temperature of the wireless power transmission system is controlled by controlling the rotation speed of the air-cooled cooling unit through the third control signal Ct3. In this case, it is not necessary to change the output power of the transmitter 100 and / or the receiver 200 due to the need to control the temperature of the wireless power transmission system, and the charging speed and customer experience of the wireless power transmission system will not be affected.

[0073] In another specific embodiment of the second embodiment, see [reference needed]. Figure 8 The diagram shows a magnetic wireless power transmission system for temperature control according to another embodiment of the second embodiment of this application. For the transmitter 100 including the cooling unit 160, the temperature control signal Ct includes at least one of a first control signal Ct1, a second control signal Ct2, and a third control signal Ct3.

[0074] In specific implementation, if the charging speed of receiver 200 is given priority, when either the transmitter temperature signal Ttx or the receiver temperature signal Trx is greater than or equal to the temperature control set threshold and less than the second threshold, the temperature control signal Ct includes the third control signal Ct3; when either the transmitter temperature signal Ttx or the receiver temperature signal Trx is greater than or equal to the second threshold and less than the third threshold, the temperature control signal Ct includes the third control signal Ct3 and the second control signal Ct2; when either the transmitter temperature signal Ttx or the receiver temperature signal Trx is greater than or equal to the third threshold, the temperature control signal Ct includes the first control signal Ct1, the second control signal Ct2, and the third control signal Ct3.

[0075] When either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the temperature control set threshold and less than the second threshold, the temperature control signal Ct is only the third control signal Ct3. In this case, the temperature is controlled only by controlling the cooling unit 160, without changing the output power of the transmitter 100. Therefore, the charging speed of the receiver 200 will not be changed due to temperature control, and it will not affect the user's use.

[0076] When either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the second threshold and less than the third threshold, the temperature control signal Ct becomes the third control signal Ct3 and the second control signal Ct2. At this time, the temperature is controlled by controlling the output power of the cooling unit 160 and the receiver 200 (e.g., reducing their load). While further accelerating the efficiency of temperature control in the magnetic wireless power transmission system, the output power of the transmitter 100 is not changed, so the charging speed of the receiver 200 will not be changed due to temperature control.

[0077] However, when the transmitter-side temperature signal Ttx and the receiver-side temperature signal Trx further increase to a point where either one is greater than or equal to a third threshold, making the temperature control signal Ct a first control signal Ct1, a second control signal Ct2, and a third control signal Ct3, then the temperature is controlled by adjusting the output power of the cooling unit 160, the transmitter 100, and the receiver 200 (e.g., by reducing their load), thereby accelerating the efficiency of temperature control in the magnetic wireless power transmission system. In this way, the charging efficiency of the receiver 200 is ensured, and the user's needs are also met.

[0078] In specific implementation, if the cooling speed of the magnetic wireless power transmission system is given priority, when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the temperature control set threshold and less than the fourth threshold, the temperature control signal Ct includes the first control signal Ct1; when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the fourth threshold and less than the fifth threshold, the temperature control signal Ct includes the first control signal Ct1 and the third control signal Ct3; when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the fifth threshold, the temperature control signal Ct includes the first control signal Ct1, the second control signal Ct2, and the third control signal Ct3.

[0079] When either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the temperature control set threshold and less than the fourth threshold, the temperature control signal Ct becomes only the first control signal Ct1. In this case, the temperature is fundamentally controlled by reducing the output power of the transmitter 100 and thus reducing the heat generated by the transmitter 100. When either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the fourth threshold and less than the fifth threshold, the temperature control signal Ct becomes both the first control signal Ct1 and the third control signal Ct3. In this case, while reducing the output power of the transmitter 100, the cooling unit 160 is activated to further accelerate the temperature control speed. When the transmitter-side temperature signal Ttx and the receiver-side temperature signal Trx further increase until either one is greater than or equal to the fifth threshold, the temperature control signal Ct becomes the first control signal Ct1, the second control signal Ct2, and the third control signal Ct3. At this point, the temperature is controlled by adjusting the output power of the cooling unit 160, the transmitter 100, and the receiver 200 (e.g., by reducing their load), thereby accelerating the efficiency of temperature control in the magnetic wireless power transmission system. Through this method, the temperature control requirements are first met, ensuring that the temperature of the magnetic wireless power transmission system remains within an acceptable range.

[0080] Whether to prioritize the cooling speed or the charging speed of the magnetic wireless power transmission system can be time-dependent. For example, during the day, charging speed can be prioritized, and the cooling unit 160 can be activated first when the temperature signal Ttx at the transmitter end and the temperature signal Trx at the receiver end reach the threshold for activating temperature control. At night, cooling can be prioritized, and the output power of the transmitter 100 end can be reduced first when the temperature signal Ttx at the transmitter end and the temperature signal Trx at the receiver end reach the threshold for activating temperature control.

[0081] In practical applications, the third control signal Ct3 can be adjusted based on the levels of the transmitter-side temperature signal Ttx and the receiver-side temperature signal Trx to change the cooling speed of the cooling unit 160. For example, when the cooling unit 160 is an air-cooled unit, the third control signal Ct3 can be used to control the fan speed in the air-cooled unit. Furthermore, the higher the transmitter-side temperature signal Ttx and the receiver-side temperature signal Trx, the higher the fan speed caused by the third control signal Ct3.

[0082] In practical applications, the temperature control threshold and the first to fifth thresholds can be set according to actual product requirements and temperature control objectives. Their values ​​and relationships are not limited; they are only used for differentiation. By changing the combination of the first control signal Ct1, the second control signal Ct2, and the third control signal Ct3, temperature control becomes more flexible without requiring changes to the hardware circuitry or increasing costs.

[0083] In practical applications, foreign objects (such as paperclips, coins, etc.) may exist between or near the transmitter and receiver. When transmitting power between the transmitter and receiver, foreign objects not only cause unnecessary power consumption, thus reducing the efficiency of the wireless power transmission system, but also cause the object itself to overheat, affecting the user experience. For example, the new standard IEC 62368 stipulates that the target temperature of foreign objects should be below 60 degrees Celsius. Therefore, foreign object detection (FOD) is necessary in wireless power transmission systems. This also applies to magnetic wireless power transmission systems.

[0084] The first existing detection method involves using power difference for FOD detection during wireless charging. Specifically, the power difference between the receiver and transmitter is compared to a power threshold to determine the presence of foreign objects. This detection method suffers from inaccurate FOD detection due to factors such as model accuracy, coupling variations, and coil type, leading to false alarms or missed alarms. Furthermore, as the power level of wireless power transmission systems increases (which is the current trend), higher detection accuracy is needed to meet standards. However, this is difficult to achieve with high-power wireless power transmission systems due to limitations in current hardware circuits (such as sampling circuits) and software calculation speeds. For example, foreign objects like paperclips only result in a power loss of approximately 300 milliwatts at 60 degrees Celsius, making it difficult to detect their presence through power loss alone.

[0085] The second existing detection method involves performing FOD (Foreign Object Defect) detection by measuring the quality factor (Q value) before wireless charging begins. This is because foreign objects significantly reduce the Q value of coil coupling. This detection method offers high accuracy and is independent of the power level of the wireless power transmission system. However, the Q value can only be detected before wireless charging begins. If, during wireless charging, vibrations cause transmitter and / or receiver displacement, leading to foreign object insertion, especially in applications with high vibration such as automobiles, the Q value of coil coupling will be undetectable. In such cases, detection must rely on power difference, which suffers from the drawbacks of power difference detection methods.

[0086] In reality, foreign objects are permissible between or near the transmitter and receiver, as long as their temperature does not exceed a certain range. Therefore, essentially, one reason we detect and eliminate foreign objects is that their temperature rises to the point of affecting the user experience. Thus, using temperature, a parameter more intuitive to the user, to determine the presence of foreign objects would be more intuitive and accurate.

[0087] In practical applications, temperature sensors are installed at various points on both the transmitter and receiver of a wireless power transmission system to detect the temperature of these components and ensure reliable operation. For example, the transmitter may have a built-in temperature sensor to detect the temperature of key internal components such as chips, coils, and PCBs. Similarly, the receiver may have a built-in temperature sensor to detect the temperature of key internal components such as chips, coils, motherboards, and batteries. In the magnetic wireless power transmission system of this application, each of the multiple magnets within the transmitter and receiver is equipped with a temperature sensor.

[0088] Furthermore, as mentioned above, the transmitter-side control unit 150 of this application not only receives the transmitter-side temperature signal Ttx reflecting its own temperature, but also receives the receiver-side temperature signal Trx reflecting the temperature of the receiver 200 via in-band communication. Therefore, for the transmitter 100 in the magnetic wireless power transmission system of this application, when the transmitter-side temperature signal Ttx indicates that the temperature at a certain location of the transmitter 100 is higher than a set value, the transmitter-side control unit 150 can output an indication signal indicating the presence of a foreign object at that location of the transmitter 100. When the receiver-side temperature signal Trx received by the transmitter-side control unit 150 indicates that the temperature at a certain location of the receiver 200 is higher than a set value, the transmitter-side control unit 150 can also output an indication signal indicating the presence of a foreign object at that location of the receiver 200. This makes foreign object detection simple and direct, with high accuracy, and can be performed at any time.

[0089] As described above, the transmitter can take into account the temperature of the entire magnetic wireless charging system to formulate more intelligent charging control algorithms, cooling algorithms, and FOD detection strategies.

[0090] Another embodiment of this application provides a method for controlling the temperature of a magnetic wireless power transmission system by a transmitter, which can be found in [reference needed]. Figure 9 The flowchart shown illustrates a method for controlling the temperature of a magnetic wireless power transmission system using a transmitter, which includes:

[0091] S1: Receive the transmitter end temperature signal Ttx, which reflects the temperature of the transmitter, and receive the receiver end temperature signal Trx, which reflects the temperature of the receiver in the magnetic wireless power transmission system, through in-band communication.

[0092] S2: Output a temperature control signal Ct to control the temperature of the magnetic wireless power transmission system based on the transmitter temperature signal Ttx and the receiver temperature signal Trx.

[0093] Specifically, the transmitter-side control unit 150 can execute the above steps. The principle and advantages of temperature control for the magnetic wireless power transmission system are the same as those of the transmitter 100 described above, and will not be repeated here.

[0094] See also Figure 4 In one embodiment, the temperature control signal Ct includes at least one of a first control signal Ct1 controlling the transmitter-side conversion unit 110 and a second control signal Ct2 controlling the receiver, wherein the first control signal Ct1 is used to control the output power of the transmitter 100 and the second control signal Ct2 is used to control the output power of the receiver, wherein the second control signal Ct2 is transmitted from the transmitter-side control unit to the receiver via in-band communication.

[0095] Specifically, in step S2, when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the temperature control set threshold and less than the first threshold, the temperature control signal Ct includes the first control signal Ct1; when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the first threshold, the temperature control signal Ct includes the first control signal Ct1 and the second control signal Ct2.

[0096] See also Figure 5 In step S2, when either the transmitter temperature signal Ttx or the receiver temperature signal Trx is greater than or equal to the temperature control set threshold, the temperature control signal Ct becomes the second control signal Ct2.

[0097] See also Figure 8 In one embodiment, the transmitter 100 further includes a cooling unit 160; wherein the temperature control signal Ct may further include a third control signal Ct3 for controlling the cooling unit 160. If the charging speed of the receiver is given priority, in step S2, when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to a temperature control set threshold and less than a second threshold, the temperature control signal Ct includes the third control signal Ct3; when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the second threshold and less than the third threshold, the temperature control signal Ct includes the third control signal Ct3 and the second control signal Ct2; when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the third threshold, the temperature control signal Ct includes a first control signal Ct1, a second control signal Ct2, and a third control signal Ct3.

[0098] In one embodiment, the transmitter 100 further includes a cooling unit 160; wherein the temperature control signal Ct may further include a third control signal Ct3 controlling the cooling unit 160. If the cooling speed of the magnetic wireless power transmission system is given priority, in step S2, when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to a temperature control set threshold and less than a fourth threshold, the temperature control signal Ct includes a first control signal Ct1; when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to a fourth threshold and less than a fifth threshold, the temperature control signal Ct includes a first control signal Ct1 and a third control signal Ct3; when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to a fifth threshold, the temperature control signal Ct includes a first control signal Ct1, a second control signal Ct2, and a third control signal Ct3.

[0099] See also Figure 7 In one embodiment, the transmitter 100 further includes a cooling unit 160; in step S2, the temperature control signal Ct includes a third control signal Ct3 for controlling the cooling unit 160.

[0100] The method for controlling the temperature of the magnetic wireless power transmission system by the transmitter is the same as the principle and advantages of the transmitter 100 used to achieve temperature control of the magnetic wireless power transmission system, and will not be repeated here.

[0101] In one embodiment of this application, a control chip is also provided to perform the above-described method for controlling the temperature of a transmitter-controlled magnetic wireless power transmission system. That is, the control chip performs the functions of the transmitter-side control unit 150.

[0102] In one embodiment, when the temperature signal received by the control chip from the transmitter indicates that the temperature at a certain location of the transmitter is higher than a set value, the control chip outputs an indication signal that there is a foreign object at that location of the transmitter.

[0103] In one embodiment, when the temperature signal received by the control chip at the receiver indicates that the temperature at a certain location of the receiver is higher than a set value, the control chip outputs an indication signal that there is a foreign object at that location of the receiver.

[0104] Based on the above analysis, the method of controlling the temperature of the transmitter in the magnetic wireless power transmission system by controlling the chip can achieve the same principle and advantages as the above method of controlling the temperature of the transmitter in the magnetic wireless power transmission system, and will not be repeated here.

[0105] In practical applications, the receiver-side control unit 250 can also receive the receiver-side temperature signal TRX, which reflects its own temperature, and receive the transmitter-side temperature signal Ttx, which reflects the transmitter's temperature, via in-band communication. Therefore, the receiver 200 can also perform the functions executed by the transmitter 100, that is, the receiver 200 takes the lead in formulating a more intelligent charging control algorithm, cooling algorithm, and FOD detection strategy based on the overall temperature of the magnetic wireless charging system.

[0106] In actual operation, the transmitter control unit 150 and the receiver control unit 250 can exchange temperature control handshake protocols to determine the temperature of the magnetic wireless power transmission system controlled by the transmitter or receiver according to the temperature control handshake protocol.

[0107] In practice, one of the transmitter and receiver can be assumed to be in control of temperature control in the magnetic wireless power transmission system. When the other needs to control the temperature, a temperature control handshake protocol can be sent to the other. After the handshake, the control of temperature control is exchanged.

[0108] Based on this, this application also provides a receiver in a wireless power transmission system. See also... Figure 10 The schematic diagram of a receiver in a wireless power transmission system according to an embodiment of this application shown includes:

[0109] The receiver-side conversion unit 210 is used to perform power conversion;

[0110] The receiver coil L2 is connected to the receiver-end conversion unit 210 and is also used to couple with the transmitter coil L1 inside the transmitter 100;

[0111] The receiver magnet 230 is used to magnetically attract the transmitter magnet 130 inside the transmitter 100;

[0112] The receiver-side temperature sensor 240 is used to detect the temperature of the receiver and outputs the receiver-side temperature signal Trx.

[0113] The receiver-side control unit 250 is configured to receive a receiver-side temperature signal Trx and a transmitter-side temperature signal Ttx reflecting the temperature of the transmitter 100 via in-band communication, and to output a temperature control signal Ct to control the temperature of the magnetic wireless power transmission system based on the transmitter-side temperature signal Ttx and the receiver-side temperature signal Trx.

[0114] The principle and advantages of temperature control for the magnetic wireless power transmission system are the same as those of the transmitter 100 mentioned above, and will not be repeated here.

[0115] See also Figure 11The diagram shows a magnetic wireless power transmission system for temperature control in one embodiment of the third embodiment of this application. In one embodiment of the third embodiment, the temperature control signal Ct includes at least one of a first control signal Ct1 for controlling the transmitter and a second control signal Ct2 for controlling the receiver-side conversion unit 210. The first control signal Ct1 is used to control the output power of the transmitter 100, and the second control signal Ct2 is used to control the output power of the receiver 200. The first control signal Ct1 is transmitted from the receiver-side control unit 250 to the transmitter 100 via in-band communication.

[0116] Similarly, the first control signal Ct1 is transmitted from the receiver control unit 250 to the transmitter control unit 150 via in-band communication (such as ASK). The transmitter control unit 150 outputs a control signal to control the operation of the transmitter conversion unit 110 according to the first control signal Ct1.

[0117] Similarly, the transmitter temperature signal Ttx is transmitted from the transmitter temperature sensor 140 to the receiver control unit 250 via in-band communication (such as FSK).

[0118] In a specific embodiment of the third embodiment, when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to a temperature control set threshold and less than a first threshold, the temperature control signal Ct includes a first control signal Ct1; when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the first threshold, the temperature control signal Ct includes a first control signal Ct1 and a second control signal Ct2.

[0119] Similarly, specifically, when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to a temperature control set threshold but less than a first threshold, making the temperature control signal Ct only the first control signal Ct1, then the temperature is controlled solely by controlling the output power of the transmitter 100. Specifically, this involves reducing the output power of the transmitter 100. When either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the first threshold, making the temperature control signal Ct both the first control signal Ct1 and the second control signal Ct2, then the temperature is controlled by simultaneously controlling the output power of both the transmitter 100 and the receiver 200. This ensures that the output power of the receiver 200 is maintained to meet user needs. When reducing the output power of the transmitter 100 alone is insufficient to reduce the temperature of the wireless power transmission system, then the temperature is controlled by simultaneously reducing the output power of both the transmitter 100 and the receiver 200.

[0120] In another embodiment of the third embodiment, when either the transmitter temperature signal Ttx or the receiver temperature signal Trx is greater than or equal to the temperature control set threshold, the temperature control signal Ct is the second control signal Ct2.

[0121] See also Figure 12 The diagram shown is a schematic of a magnetic wireless power transmission system for temperature control according to the fourth embodiment of this application. In the fourth embodiment, for the transmitter 100 including the cooling unit 160, the temperature control signal Ct includes a third control signal Ct3 for controlling the cooling unit 160. When the receiver control unit 250 determines that the temperature of the magnetic wireless power transmission system needs to be controlled based on the transmitter-side temperature signal Ttx and the receiver-side temperature signal Trx, the temperature control signal Ct becomes the third control signal Ct3. For example, the temperature of the wireless power transmission system is controlled by controlling the rotation speed of the air-cooled cooling unit through the third control signal Ct3. In this case, it is not necessary to change the output power of the transmitter 100 and / or the receiver 200 due to the need to control the temperature of the wireless power transmission system, and the charging speed and customer experience of the wireless power transmission system will not be affected.

[0122] Specifically, the third control signal Ct3 is transmitted from the receiver control unit 250 to the transmitter control unit 150 via in-band communication (such as ASK). The transmitter control unit 150 outputs a control signal to control the operation of the transmitter conversion unit 110 according to the first control signal Ct1.

[0123] In another specific embodiment of the fourth embodiment, see [reference needed]. Figure 13 The diagram shows a magnetic wireless power transmission system for temperature control in another embodiment of the fourth embodiment of this application. For the transmitter 100 including the cooling unit 160, the temperature control signal Ct includes at least one of a first control signal Ct1, a second control signal Ct2, and a third control signal Ct3.

[0124] In specific implementation, if the charging speed of receiver 200 is given priority, when either the transmitter temperature signal Ttx or the receiver temperature signal Trx is greater than or equal to the temperature control set threshold and less than the second threshold, the temperature control signal Ct includes the third control signal Ct3; when either the transmitter temperature signal Ttx or the receiver temperature signal Trx is greater than or equal to the second threshold and less than the third threshold, the temperature control signal Ct includes the third control signal Ct3 and the second control signal Ct2; when either the transmitter temperature signal Ttx or the receiver temperature signal Trx is greater than or equal to the third threshold, the temperature control signal Ct includes the first control signal Ct1, the second control signal Ct2, and the third control signal Ct3.

[0125] When either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the temperature control set threshold and less than the second threshold, the temperature control signal Ct is only the third control signal Ct3. In this case, the temperature is controlled only by controlling the cooling unit 160, without changing the output power of the transmitter 100. Therefore, the charging speed of the receiver 200 will not be changed due to temperature control, and it will not affect the user's use.

[0126] When either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the second threshold and less than the third threshold, the temperature control signal Ct becomes the third control signal Ct3 and the second control signal Ct2. At this time, the temperature is controlled by controlling the output power of the cooling unit 160 and the receiver 200 (e.g., reducing their load). While further accelerating the efficiency of temperature control in the magnetic wireless power transmission system, the output power of the transmitter 100 is not changed, so the charging speed of the receiver 200 will not be changed due to temperature control.

[0127] However, when the transmitter-side temperature signal Ttx and the receiver-side temperature signal Trx further increase to a point where either one is greater than or equal to a third threshold, making the temperature control signal Ct a first control signal Ct1, a second control signal Ct2, and a third control signal Ct3, then the temperature is controlled by adjusting the output power of the cooling unit 160, the transmitter 100, and the receiver 200 (e.g., by reducing their load), thereby accelerating the efficiency of temperature control in the magnetic wireless power transmission system. In this way, the charging efficiency of the receiver 200 is ensured, and the user's needs are also met.

[0128] In specific implementation, if the cooling speed of the magnetic wireless power transmission system is given priority, when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the temperature control set threshold and less than the fourth threshold, the temperature control signal Ct includes the first control signal Ct1; when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the fourth threshold and less than the fifth threshold, the temperature control signal Ct includes the first control signal Ct1 and the third control signal Ct3; when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the fifth threshold, the temperature control signal Ct includes the first control signal Ct1, the second control signal Ct2, and the third control signal Ct3.

[0129] When either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the temperature control set threshold and less than the fourth threshold, such that the temperature control signal Ct is only the first control signal Ct1, then the temperature can be fundamentally controlled by reducing the output power of the transmitter 100 and reducing the heat generated by the transmitter 100.

[0130] When either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the fourth threshold and less than the fifth threshold, the temperature control signal Ct is made to be the first control signal Ct1 and the third control signal Ct3. This reduces the output power of the transmitter 100 while making the cooling unit 160 work to further accelerate the temperature control speed.

[0131] When the transmitter-side temperature signal Ttx and the receiver-side temperature signal Trx further increase until either one is greater than or equal to the fifth threshold, the temperature control signal Ct becomes the first control signal Ct1, the second control signal Ct2, and the third control signal Ct3. At this point, the temperature is controlled by adjusting the output power of the cooling unit 160, the transmitter 100, and the receiver 200 (e.g., by reducing their load), thereby accelerating the efficiency of temperature control in the magnetic wireless power transmission system. Through this method, the temperature control requirements are first met, ensuring that the temperature of the magnetic wireless power transmission system remains within an acceptable range.

[0132] The priority should be given to either cooling or charging speed in the magnetic wireless power transmission system, which can be time-dependent. For example, during the day, charging speed can be prioritized, and when the transmitter temperature signal Ttx and receiver temperature signal Trx reach the threshold for activating temperature control, the cooling unit 160 can be activated first. At night, cooling can be prioritized, and when the transmitter temperature signal Ttx and receiver temperature signal Trx reach the threshold for activating temperature control, the output power of the transmitter 100 can be reduced first.

[0133] Similarly, for foreign object detection, the receiver control unit 250 of this application not only receives the receiver temperature signal Trx reflecting its own temperature, but also receives the transmitter temperature signal Ttx reflecting the temperature of the transmitter 100 via in-band communication. Therefore, for the transmitter 100 in the magnetic wireless power transmission system of this application, when the transmitter temperature signal Ttx indicates that the temperature at a certain location of the transmitter 100 is higher than a set value, the receiver control unit 250 can output an indication signal indicating the presence of a foreign object at that location of the transmitter 100. When the receiver temperature signal Trx received by the receiver control unit 250 indicates that the temperature at a certain location of the receiver 200 is higher than a set value, the receiver control unit 250 can also output an indication signal indicating the presence of a foreign object at that location of the receiver 200. This makes foreign object detection simple and direct, not only highly accurate, but also capable of detection at any time.

[0134] Similarly, this application also provides a method for a receiver to control the temperature of a magnetic wireless power transmission system, comprising: S1: receiving a receiver-end temperature signal Trx reflecting the temperature of the receiver, and receiving a transmitter-end temperature signal Ttx reflecting the temperature of the transmitter in the magnetic wireless power transmission system via in-band communication; S2: outputting a temperature control signal Ct to control the temperature of the magnetic wireless power transmission system based on the transmitter-end temperature signal Ttx and the receiver-end temperature signal Trx.

[0135] In one embodiment, the temperature control signal Ct includes at least one of a first control signal Ct1 controlling the transmitter-side conversion unit 110 and a second control signal Ct2 controlling the receiver, wherein the first control signal Ct1 is used to control the output power of the transmitter 100 and the second control signal Ct2 is used to control the output power of the receiver, wherein the first control signal Ct1 is transmitted from the receiver-side control unit to the transmitter via in-band communication.

[0136] In one embodiment, in step S2, when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to a temperature control set threshold and less than a first threshold, the temperature control signal Ct includes a first control signal Ct1; when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the first threshold, the temperature control signal Ct includes a first control signal Ct1 and a second control signal Ct2.

[0137] In one embodiment, in step S2, when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the temperature control set threshold, the temperature control signal Ct is the second control signal Ct2.

[0138] In one embodiment, the transmitter further includes a cooling unit 160. The temperature control signal Ct may also include a third control signal Ct3 controlling the cooling unit 160. If the charging speed of the receiver is prioritized, in step S2, when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to a temperature control set threshold and less than a second threshold, the temperature control signal Ct includes the third control signal Ct3; when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the second threshold and less than the third threshold, the temperature control signal Ct includes the third control signal Ct3 and the second control signal Ct2; when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the third threshold, the temperature control signal Ct includes a first control signal Ct1, a second control signal Ct2, and a third control signal Ct3.

[0139] In one embodiment, the transmitter further includes a cooling unit 160. The temperature control signal Ct may also include a third control signal Ct3 controlling the cooling unit 160. If the cooling speed of the magnetic wireless power transmission system is prioritized, in step S2, when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to a temperature control set threshold and less than a fourth threshold, the temperature control signal Ct includes a first control signal Ct1; when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the fourth threshold and less than a fifth threshold, the temperature control signal Ct includes the first control signal Ct1 and the third control signal Ct3; when either the transmitter-side temperature signal Ttx or the receiver-side temperature signal Trx is greater than or equal to the fifth threshold, the temperature control signal Ct includes the first control signal Ct1, the second control signal Ct2, and the third control signal Ct3.

[0140] In one embodiment, the transmitter further includes a cooling unit 160. In step S2, the temperature control signal Ct includes a third control signal Ct3 that controls the cooling unit 160.

[0141] Similarly, this application also provides a control chip that performs the above-described method for controlling the temperature of a magnetic wireless power transmission system using a receiver.

[0142] In one embodiment, when the temperature signal received by the control chip from the transmitter indicates that the temperature at a certain location of the transmitter is higher than a set value, the control chip outputs an indication signal that there is a foreign object at that location of the transmitter.

[0143] In one embodiment, when the temperature signal received by the control chip at the receiver indicates that the temperature at a certain location of the receiver is higher than a set value, the control chip outputs an indication signal that there is a foreign object at that location of the receiver.

[0144] In actual implementation, the transmitter-side conversion unit 110 can be any applicable power conversion unit, as long as its output power can be controlled by control signals and meets the requirements of the transmitter, such as a full-bridge conversion unit, a half-bridge conversion unit, etc.

[0145] In actual implementation, the receiver-side conversion unit 210 can be any applicable power conversion unit, as long as its output power can be controlled by the control signal and meets the requirements of the receiver, such as a full-bridge conversion unit, a half-bridge conversion unit, etc.

[0146] In practice, this application does not limit the specific type and structure of the temperature sensor.

[0147] In practical implementation, the receiver-side control unit and the transmitter-side control unit can be implemented as digital chips, such as DSPs and MCUs. Similarly, the aforementioned control chips can also be implemented as digital chips, such as DSPs and MCUs.

[0148] 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.

[0149] 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 in a magnetic wireless power transmission system, characterized in that, include: Transmitter-side conversion unit, used to implement power conversion; The transmitter coil, connected to the transmitter-end conversion unit, is also used to couple with the receiver coil in the receiver of the magnetic wireless power transmission system; A transmitter-end magnet is used to magnetically attract with a receiver-end magnet inside the receiver. A transmitter-side temperature sensor is used to detect the temperature of the transmitter and output a transmitter-side temperature signal. The transmitter-side control unit is configured to receive the transmitter-side temperature signal and receive the receiver-side temperature signal reflecting the temperature of the receiver via in-band communication, and output a temperature control signal to control the temperature of the magnetic wireless power transmission system based on the transmitter-side temperature signal and the receiver-side temperature signal.

2. The transmitter in the magnetic wireless power transmission system according to claim 1, characterized in that, The temperature control signal includes at least one of a first control signal controlling the transmitter-side conversion unit and a second control signal controlling the receiver. The first control signal is used to control the output power of the transmitter, and the second control signal is used to control the output power of the receiver. The second control signal is transmitted from the transmitter control unit to the receiver via the in-band communication.

3. The transmitter in the magnetic wireless power transmission system according to claim 2, characterized in that, When either the transmitter temperature signal or the receiver temperature signal is greater than or equal to a temperature control set threshold and less than a first threshold, the temperature control signal includes the first control signal. When either the transmitter temperature signal or the receiver temperature signal is greater than or equal to the first threshold, the temperature control signal includes the first control signal and the second control signal.

4. The transmitter in the magnetic wireless power transmission system according to claim 2, characterized in that, The transmitter also includes a cooling unit; The temperature control signal may further include a third control signal for controlling the refrigeration unit.

5. The transmitter in the magnetic wireless power transmission system according to claim 4, characterized in that, If the charging speed of the receiver is taken into consideration, When either the transmitter temperature signal or the receiver temperature signal is greater than or equal to a temperature control set threshold and less than a second threshold, the temperature control signal includes the third control signal; When either the transmitter temperature signal or the receiver temperature signal is greater than or equal to the second threshold and less than the third threshold, the temperature control signal includes the third control signal and the second control signal; When either the transmitter temperature signal or the receiver temperature signal is greater than or equal to the third threshold, the temperature control signal includes the first control signal, the second control signal, and the third control signal.

6. The transmitter in the magnetic wireless power transmission system according to claim 4, characterized in that, If the cooling speed of the magnetic wireless power transmission system is given priority... When either the transmitter temperature signal or the receiver temperature signal is greater than or equal to a temperature control set threshold and less than a fourth threshold, the temperature control signal includes the first control signal. When either the transmitter temperature signal or the receiver temperature signal is greater than or equal to the fourth threshold and less than the fifth threshold, the temperature control signal includes the first control signal and the third control signal. When either the transmitter temperature signal or the receiver temperature signal is greater than or equal to the fifth threshold, the temperature control signal includes the first control signal, the second control signal, and the third control signal.

7. The transmitter in the magnetic wireless power transmission system according to claim 1, characterized in that, The transmitter also includes a cooling unit, and the temperature control signal includes a third control signal for controlling the cooling unit.

8. The transmitter in the magnetic wireless power transmission system according to claim 1, characterized in that, When either the transmitter temperature signal or the receiver temperature signal is greater than or equal to a temperature control set threshold, the temperature control signal includes the second control signal, which is used to control the output power of the receiver. The second control signal is transmitted from the transmitter control unit to the receiver via the in-band communication.

9. The transmitter in the magnetic wireless power transmission system according to claim 1, characterized in that, When the transmitter end temperature signal indicates that the temperature at a certain location of the transmitter is higher than a set value, the transmitter end control unit outputs an indication signal that there is a foreign object at that location of the transmitter.

10. The transmitter in the magnetic wireless power transmission system according to claim 1, characterized in that, When the temperature signal received by the transmitter control unit from the receiver indicates that the temperature at a certain location of the receiver is higher than a set value, the transmitter control unit outputs an indication signal that there is a foreign object at that location of the receiver.

11. The transmitter in the magnetic wireless power transmission system according to claim 1, characterized in that, The temperature signal packet for in-band communication includes a header portion and a data portion.

12. The transmitter in the magnetic wireless power transmission system according to claim 1, characterized in that, The transmitter control unit and the receiver exchange temperature control handshake protocols. Specifically, the temperature control handshake protocol determines whether the transmitter or the receiver will control the temperature of the magnetic wireless power transmission system.

13. A method for controlling the temperature of a magnetic wireless power transmission system by a transmitter, characterized in that, include: S1: Receive the transmitter end temperature signal reflecting the temperature of the transmitter, and receive the receiver end temperature signal reflecting the temperature of the receiver in the magnetic wireless power transmission system through in-band communication. S2: Output a temperature control signal to control the temperature of the magnetic wireless power transmission system based on the temperature signal at the transmitter end and the temperature signal at the receiver end.

14. The method for controlling the temperature of a transmitter-controlled magnetic wireless power transmission system according to claim 13, characterized in that, The temperature control signal includes at least one of a first control signal controlling the transmitter-side conversion unit and a second control signal controlling the receiver. The first control signal is used to control the output power of the transmitter, and the second control signal is used to control the output power of the receiver. The second control signal is transmitted from the transmitter control unit to the receiver via the in-band communication.

15. The method for controlling the temperature of a transmitter-controlled magnetic wireless power transmission system according to claim 14, characterized in that, In step S2, when either the transmitter end temperature signal or the receiver end temperature signal is greater than or equal to the temperature control set threshold and less than the first threshold, the temperature control signal includes the first control signal; When either the transmitter temperature signal or the receiver temperature signal is greater than or equal to the first threshold, the temperature control signal includes the first control signal and the second control signal.

16. The method for controlling the temperature of a transmitter-controlled magnetic wireless power transmission system according to claim 14, characterized in that, The transmitter also includes a cooling unit; wherein the temperature control signal may further include a third control signal for controlling the cooling unit; If the charging speed of the receiver is taken into consideration, In step S2, when either the transmitter end temperature signal or the receiver end temperature signal is greater than or equal to the temperature control set threshold and less than the second threshold, the temperature control signal includes the third control signal; When either the transmitter temperature signal or the receiver temperature signal is greater than or equal to the second threshold and less than the third threshold, the temperature control signal includes the third control signal and the second control signal; When either the transmitter temperature signal or the receiver temperature signal is greater than or equal to the third threshold, the temperature control signal includes the first control signal, the second control signal, and the third control signal.

17. The method for controlling the temperature of a transmitter-controlled magnetic wireless power transmission system according to claim 14, characterized in that, The transmitter also includes a cooling unit; wherein the temperature control signal may further include a third control signal for controlling the cooling unit; If the cooling speed of the magnetic wireless power transmission system is given priority... In step S2, when either the transmitter end temperature signal or the receiver end temperature signal is greater than or equal to the temperature control set threshold and less than the fourth threshold, the temperature control signal includes the first control signal; When either the transmitter temperature signal or the receiver temperature signal is greater than or equal to the fourth threshold and less than the fifth threshold, the temperature control signal includes the first control signal and the third control signal. When either the transmitter temperature signal or the receiver temperature signal is greater than or equal to the fifth threshold, the temperature control signal includes the first control signal, the second control signal, and the third control signal.

18. The method for controlling the temperature of a transmitter-controlled magnetic wireless power transmission system according to claim 13, characterized in that, The transmitter also includes a cooling unit; in step S2, the temperature control signal includes a third control signal that controls the cooling unit.

19. A control chip that performs a method for controlling the temperature of a transmitter-controlled magnetic wireless power transmission system according to any one of claims 13 to 18.

20. The control chip according to claim 19, characterized in that, When the temperature signal at the transmitter indicates that the temperature at a certain location of the transmitter is higher than a set value, the control chip outputs an indication signal that there is a foreign object at that location of the transmitter; When the temperature signal at the receiver indicates that the temperature at a certain location of the receiver is higher than a set value, the control chip outputs an indication signal that there is a foreign object at that location of the receiver.

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