Wireless charging control method and applicable wireless charging system thereof

Abstract

The present disclosure provides a wireless charging control method and an applicable wireless charging system, the wireless charging control method is applicable to a wireless charging system including a transmitting module and a receiving module, and includes the steps of: (a), by the transmitting module, when an input power is greater than a power threshold value or an element temperature is greater than a temperature threshold value; determining a target output power according to the input power or the element temperature; (b) modulating the information about the target output power to the input electric energy through the transmitting module; (c) receiving and sampling, by a receiving module, the input power to demodulate information about the target output power; and (d) converting, by the receiving module, the input electric energy into the target output power according to the information about the target output power.

Description

Technical Field

[0001] The present disclosure relates to a charging control method and a charging system applicable thereto, and in particular to a wireless charging control method and a wireless charging system applicable thereto. Background Art

[0002] In wireless power transmission, when the distance between the transmitting coil and the receiving coil increases, the magnetic leakage also increases. At this time, the input power needs to increase significantly to maintain the same output power. Therefore, when the distance between the transmitting coil and the receiving coil increases to a certain extent, foreign object detection (FOD) may be activated due to excessive power loss, or low voltage protection may be activated due to low voltage on the receiving side, or over-temperature protection may be activated due to high temperature of the components on the transmitting side. The foreign object detection, low voltage protection and over-temperature protection may all cause intermittent power transmission, thereby affecting the stability of wireless power transmission.

[0003] Therefore, it is an urgent need to invent a wireless charging control method and a wireless charging system applicable thereto that can improve the above-mentioned prior art. Summary of the invention

[0004] The purpose of the present disclosure is to provide a wireless charging control method and a wireless charging system applicable thereto, which controls the transmitting side circuit to operate in a special adjustment mode when the input power or component temperature of the transmitting side is too high, and the receiving side can know that the transmitting side circuit is operating in the adjustment mode by sampling the received electric energy, and correspondingly reduce the output power, thereby reducing the input power. In this way, when the distance between the transmitting side and the receiving side increases, the input power can be prevented from excessively increasing, triggering the protection function and interrupting the electric energy transmission, effectively improving the stability of wireless power transmission.

[0005] To achieve the above-mentioned purpose, the present disclosure provides a wireless charging control method for a wireless charging system including a transmitting module and a receiving module, comprising the steps of: (a) determining a target output power according to the input power or the component temperature through the transmitting module when the input power is greater than a power threshold or the component temperature is greater than a temperature threshold; (b) modulating information about the target output power to input electric energy through the transmitting module; (c) receiving and sampling the input electric energy through the receiving module to demodulate the information about the target output power; and (d) converting the input electric energy into the target output power according to the information about the target output power through the receiving module.

[0006] To achieve the above-mentioned purpose, the present disclosure further provides a wireless charging system, comprising a transmitting module and a receiving module. The transmitting module is configured to convert input power into input electrical energy and then transmit it. The receiving module is configured to receive input electrical energy and convert the input electrical energy into output electrical energy to a load. The transmitting module and the receiving module are configured to execute the wireless charging control method of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a functional block diagram of a wireless charging system according to an embodiment of the present disclosure.

[0008] Figure 2 and Figure 3 FIG. 4 is a functional block diagram of a transmitting controller and a driving circuit according to another embodiment of the present disclosure.

[0009] Figure 4 4 is a waveform diagram of an interrupted driving signal according to an embodiment of the present disclosure.

[0010] Figure 5 4 is a waveform diagram of an interrupted driving signal according to multiple embodiments of the present disclosure.

[0011] Fig. 6A exemplify Figure 1 An implementation manner of a transmitting module and a transmitting controller.

[0012] Figure 6B exemplify Figure 1 An implementation manner of a receiving module and a receiving controller.

[0013] Figure 7 4 is a flow chart of a wireless charging method according to an embodiment of the present disclosure.

[0014] Figure 8 It is a flow chart of a wireless charging control method for a transmitting module according to an embodiment of the present disclosure.

[0015] Fig. 9 It is a flow chart of a wireless charging control method for a receiving module according to an embodiment of the present disclosure.

[0016] Description of reference numerals:

[0017] 1: Wireless charging system

[0018] 10: Transmitter module

[0019] 20: Receiving module

[0020] 30: Launch Controller

[0021] 40: Receiving controller

[0022] 2: Load

[0023] PWM: driving signal

[0024] Vin: input voltage

[0025] Iin: input current

[0026] Temp: Component temperature

[0027] 11: Driving circuit

[0028] 12: Switching circuit

[0029] 13: Transmitter coil

[0030] C1, C2, C3, C4: capacitors

[0031] 21: Receiving coil

[0032] 22: Rectifier circuit

[0033] 23: Buck circuit

[0034] 24: Communication circuit

[0035] 31: First launch control unit

[0036] 32: Second launch control unit

[0037] T: Charging cycle

[0038] Ta: The interval between two interruptions

[0039] Ts: duration of the switching cycle of the drive signal

[0040] S1, S2, S3, S4: Switch

[0041] 111: First Drive

[0042] 112: Second Driver

[0043] D1, D2: diodes

[0044] S5, S6, S7, S8: Switch

[0045] C5, C6: capacitors

[0046] L: Inductance

[0047] 41: First receiving control unit

[0048] 42: Second receiving control unit

[0049] 43: Buck control unit

[0050] Vo: output voltage

[0051] Io: output current

[0052] Pin: Input power

[0053] P_th: Power threshold

[0054] T_th: temperature threshold

[0055] P_restore: restore power

[0056] T_restore: restore temperature

[0057] S71, S72, S73, S74, S75, S76, S77, S78: Steps

[0058] S81, S82, S83, S84, S85, S86: Steps

[0059] S91, S92, S93, S94, S95: Steps DETAILED DESCRIPTION

[0060] Some typical embodiments that embody the features and advantages of the present disclosure will be described in detail in the following description. It should be understood that the present disclosure can have various changes in different implementations without departing from the scope of the present disclosure.

[0061] Figure 1 FIG. 1 is a functional block diagram of a wireless charging system according to an embodiment of the present disclosure. Figure 1 As shown, the wireless charging system 1 includes a transmitting module 10 and a receiving module 20, wherein the transmitting module 10 is located at the transmitting side of the wireless charging system 1, and the receiving module 20 is located at the receiving side of the wireless charging system 1. The transmitting module 10 receives input power, converts the input power into input electrical energy, and then transmits it. The receiving module 20 is electromagnetically coupled with the transmitting module 10 to perform wireless power transmission, wherein the receiving module 20 receives the input electrical energy transmitted by the transmitting module 10 via wireless power transmission, and converts the received input electrical energy into output electrical energy, and can provide the output electrical energy to the load 2. The transmitting module 10 includes a transmitting controller 30, and the transmitting controller 30 is configured to provide a driving signal PWM to the transmitting module 10 to control the transmitting module 10 to operate in a normal mode, wherein the driving signal PWM has a switching cycle. The receiving module 20 includes a receiving controller 40, and the receiving controller 40 is configured to control the operation of the receiving module 20.

[0062] During the operation of the wireless charging system 1, the transmitting controller 30 samples the input power (for example, by sampling the input voltage Vin and the input current Iin) and senses the component temperature Temp in the transmitting module 10. When the input power is greater than the power threshold or the component temperature Temp is greater than the temperature (i.e., the input power or the component temperature Temp is too high), the transmitting controller 30 switches the transmitting module 10 to the adjustment mode. In the adjustment mode, the transmitting controller 30 controls the transmitting module 10 to interrupt the driving signal PWM a specific number of times in a charging cycle, wherein the specific number of times the driving signal PWM is interrupted depends on the size of the input power. The receiving controller 40 learns the specific number of times the transmitting module 10 interrupts the driving signal PWM in the charging cycle by sampling the input electric energy received by the receiving module 20, and reduces the output power of the output electric energy according to the size of the specific number of times. When the output power is reduced, the input power received by the transmitting module 10 can be reduced accordingly.

[0063] The relationship between the specific number of times and the reduction range of the output power can be determined according to actual needs. For example, when the specific number of times the transmitting module 10 interrupts the driving signal PWM during the charging cycle is n, the receiving controller 40 reduces the output power to (100-n*10)% of the rated power, where n is a positive integer less than 10. In addition, the aforementioned charging cycle is pre-set in the transmitting controller 30 and the receiving controller 40, and can be adjusted according to actual needs.

[0064] In addition, it should be noted that the duration of each time the transmitting module 10 interrupts the driving signal PWM (e.g., one switching cycle of the driving signal PWM) is much shorter than the duration of the charging cycle, so the interruption of the driving signal PWM does not actually affect the wireless power transmission between the transmitting module 10 and the receiving module 20. In other words, in the adjustment mode, the interruption of the driving signal PWM does not affect the continuity and stability of the wireless power transmission.

[0065] As can be seen from the foregoing, when the distance between the transmitting module 10 and the receiving module 20 increases, the receiving module 20 can reduce the output power in real time to reduce the input power accordingly, thereby avoiding triggering the protection function and interrupting the power transmission due to excessive increase in input power, and effectively improving the stability of wireless power transmission.

[0066] Furthermore, after the output power is reduced, when the input power is lower than the recovery power and the component temperature Temp is lower than the recovery temperature (i.e., the protection function will not be triggered), the transmitting controller 30 controls the transmitting module 10 to resume operation in the normal mode. At this time, the receiving controller 40 learns that the transmitting module 10 is operating in the normal mode to generate normal input power by sampling the AC power, and correspondingly increases the output power (e.g., to the rated power). The recovery power may be, for example, but not limited to, 80% of the reference power, and the recovery temperature may be, for example, but not limited to, 80% of the reference temperature.

[0067] In addition, in some embodiments, when the input power is not lower than the recovery power and / or the component temperature Temp is not lower than the recovery temperature (i.e., when at least one of the conditions is satisfied), the transmitting module 10 still generates input electrical energy corresponding to the target output power, and the receiving module 20 receives and converts the input electrical energy into the target output power.

[0068] At Figure 1 In the illustrated embodiment, the transmitting module 10 further includes a driving circuit 11, a switch circuit 12, a transmitting coil 13, a first capacitor C1, and a second capacitor C2. The driving circuit 11 is electrically connected to the transmitting controller 30, and the switch circuit 12 is electrically connected to the driving circuit 11, wherein the driving circuit 11 and the switch circuit 12 are configured to convert input power into input electrical energy according to the driving signal. In the adjustment mode, when the driving signal PWM is interrupted, the switches of the switch circuit 12 are all in the off state. The transmitting coil 13 is coupled to the switch circuit 12 and is configured to transmit input electrical energy. The first capacitor C1 is connected between the switch circuit 12 and the transmitting coil 13, and is configured to match the transmitting coil 13. The second capacitor C2 is connected between the switch circuit 12 and the transmitting coil 13, and is configured to match the transmitting coil 13.

[0069] The receiving module 20 further includes a receiving coil 21, a rectifier circuit 22, a voltage reduction circuit 23, a communication circuit 24, a third capacitor C3 and a fourth capacitor C4. The receiving coil 21 is configured to receive input electrical energy. The rectifier circuit 22 is coupled to the receiving coil 21, and the voltage reduction circuit 23 is electrically connected to the rectifier circuit 22, wherein the rectifier circuit 22 and the voltage reduction circuit 23 are configured to convert the input electrical energy into output electrical energy, and perform rectification and voltage reduction in the conversion process, respectively. The communication circuit 24 is electrically connected to the receiving coil 21, and is configured to reflect the operating status of the receiving module 20 to the transmitting module 10. The third capacitor C3 is electrically connected between the receiving coil 21 and the rectifier circuit 22, and is configured to match the receiving coil 21. The fourth capacitor C4 is electrically connected between the receiving coil 21 and the rectifier circuit 22, and is configured to match the receiving coil 21.

[0070] In addition, the transmitting controller 30 may interrupt the driving signal PWM in different ways. Several possible ways are exemplified below.

[0071] At Figure 1 In the illustrated embodiment, the transmission controller 30 directly interrupts the generated driving signal PWM.

[0072] At Figure 2 In the illustrated embodiment, the transmitting controller 30 provides the driving signal PWM and the enable signal to the driving circuit 11 through different ports, so as to interrupt the driving signal PWM by using the enable signal. For example, when the enable signal is at a high level, the driving signal PWM is interrupted, and the driving circuit 11 controls the switch in the switch circuit 12 to be in an off state, so that the transmitting module 10 is interrupted; and when the enable signal is at a low level, the driving circuit 11 drives the switch circuit 12 according to the driving signal PWM.

[0073] At Figure 3 In the illustrated embodiment, the transmitting controller 30 includes a first transmitting control unit 31 and a second transmitting control unit 32, wherein the first transmitting control unit 31 and the second transmitting control unit 32 respectively provide a driving signal PWM and an enable signal to the driving circuit 11, so as to interrupt the driving signal PWM using the enable signal. In one embodiment, the first transmitting control unit 31 and the second transmitting control unit 32 are not integrated into one transmitting controller 30; specifically, the second transmitting control unit 32 is a controller added to the existing wireless charging control system, which is configured to detect power and temperature detection and interrupt the driving signal PWM, so as to add a new adjustment mode in the existing wireless control charging system.

[0074] Figure 4 4 is a waveform diagram of an interrupted driving signal PWM according to an embodiment of the present disclosure. Figure 1 The transmission controller 30 may generate Figure 4 The driving signal PWM shown in the figure, wherein T indicates the duration of the charging cycle, and Ta indicates the interval between two interruptions. Specifically, the transmitting controller 30 determines the number of interruptions according to the input power or the component temperature Temp, and then interrupts the driving signal PWM once in the (i*a)th switching cycle to modulate the information about the target output power in the output power; wherein a is the number of switching cycles between two interruptions, 0≦i≦(n-1), i*a is less than or equal to the charging cycle T, n is the number of interruptions, and a, i, and n are positive integers. In this embodiment, the number of interruptions n is 3, the number of switching cycles a between two interruptions is 3, and the charging cycle T is equal to 30 switching cycles, so the target output power is (100-3*10)%=70% of the rated power. In this way, the transmitting controller 30 can modulate the information about the target output power in the output power.

[0075] then, Figure 1 The receiving controller 40 (or Figure 6BThe first receiving control unit 41) can capture the falling edge of one switching cycle to the rising edge of the next switching cycle to sample the drive signal PWM (i.e., output electrical energy). When the receiving controller 40 detects for the first time that the time difference between the falling edge and the rising edge is greater than half a switching cycle, the first counter starts to accumulate the charging cycle T, and the second counter starts to accumulate the number of interruptions. When the charging cycle T ends, the receiving controller 40 reads the number of interruptions accumulated by the second counter; wherein when the charging cycle T ends, the first counter and the second counter are reset; wherein the number of interruptions is the information about the target output power. In this way, the receiving module 20 can demodulate the information about the target output power.

[0076] Figure 5 FIG. 1 is a waveform diagram of an interrupted driving signal according to multiple embodiments of the present disclosure. Figure 5 In FIG. 1 , Ts is used to indicate the duration of the switching cycle of the driving signal PWM, a solid line is used to indicate the sampling signal when the transmitting module 10 operates in the adjustment mode, a dotted line is used to indicate the sampling signal when the transmitting module 10 operates in the normal mode for comparison, and a shaded area is used to indicate the interval in which the transmitting module 10 is interrupted. Figure 5 As shown, no matter what the time point when the transmitting module 10 is interrupted, the receiving controller 40 can determine whether the driving signal PWM is interrupted according to the time from the falling edge of a certain cycle to the rising edge of the next cycle in the sampling signal. After each charging cycle T, the receiving controller 40 can count the number of interruptions of the driving signal PWM in the charging cycle T.

[0077] Fig. 6A exemplify Figure 1 An embodiment of the transmitting module 10 and the transmitting controller 30. Fig. 6A As shown, the switch circuit 12 is a full-bridge switch circuit, including switches S1, S2, S3 and S4, wherein switch S1 is connected in series with switch S2, switch S3 is connected in series with switch S4, and the bridge arm formed by switches S1 and S2 is connected in parallel to the bridge arm formed by switches S3 and S4. The common connection point between switches S1 and S2 is connected to capacitor C1, and the common connection point between switches S3 and S4 is connected to capacitor C2. The drive circuit 11 includes a first driver 111 and a second driver 112. The first driver 111 receives a drive signal PWM and an enable signal from the transmission controller 30, and controls the operation of switches S1 and S2 accordingly. The second driver 112 receives a drive signal PWM and an enable signal from the transmission controller 30, and controls the operation of switches S3 and S4 accordingly.

[0078] Figure 6B exemplify Figure 1 An embodiment of the receiving module 20 and the receiving controller 40. Figure 6BAs shown, the rectifier circuit 22 includes a diode D1, a switch S5, a diode D2, a switch S6 and a capacitor C5, wherein the diode D1 is connected in series with the switch S5, the diode D2 is connected in series with the switch S6, and the bridge arm formed by the diode D1 and the switch S5, the bridge arm formed by the diode D2 and the switch S6 and the capacitor C5 are connected in parallel with each other. The step-down circuit 23 includes a switch S7, a switch S8, an inductor L and a capacitor C6, wherein two ends of the switch S7 are electrically connected to the first end of the capacitor C5 and the first end of the switch S8, respectively, two ends of the inductor L are electrically connected to the first end of the switch S8 and the first end of the capacitor C6, respectively, and the second end of the switch S8 is electrically connected to the second end of the capacitor C5 and the second end of the capacitor C6. The communication circuit 24 includes a capacitor C7, a switch S9, a capacitor C8 and a switch S10, wherein a first end of the capacitor C7 is electrically connected between the receiving coil 21 and the capacitor C3, a second end of the capacitor C7 is electrically connected to a first end of the switch S9, a first end of the capacitor C8 is electrically connected between the receiving coil 21 and the capacitor C4, a second end of the capacitor C8 is electrically connected to a first end of the switch S10, and a second end of the switch S9 is electrically connected to a second end of the switch S10.

[0079] The receiving controller 40 of the receiving module 20 includes a first receiving control unit 41, a second receiving control unit 42 and a step-down control unit 43. The first receiving control unit 41 is electrically connected to the step-down circuit 23 and the receiving coil 21, and the step-down control unit 43 is electrically connected to the step-down circuit 23 and the first receiving control unit 41, and is configured to control the operation of the step-down circuit 23. The first receiving control unit 41 samples the output voltage Vo and the output current Io to provide a control signal for the step-down control unit 43 to control the operation of the step-down circuit 23. In addition, the first receiving control unit 41 also samples the input power received by the receiving module 20, so as to know the number of interruptions of the driving signal PWM according to the input power after the transmitting module 10 switches to the adjustment mode. According to the number of interruptions, the first receiving control unit 41 provides a corresponding control signal to the step-down control unit 43, so that the step-down control unit 43 controls the step-down circuit 23 to reduce the output power. Furthermore, the first receiving control unit 41 can also communicate with the load 2 to receive the working state of the load 2 and adjust the operation of the receiving module 20 accordingly. The second receiving control unit 42 is electrically connected to the rectifying circuit 22 and the signaling circuit 24 , and is configured to control the operation of the rectifying circuit 22 and the signaling circuit 24 .

[0080] Figure 7 4 is a flow chart of a wireless charging method according to an embodiment of the present disclosure. Figure 7 Wireless charging methods are suitable for Figure 1 The wireless charging system 1 includes the following steps.

[0081] Step S71: The transmitting module 10 and the receiving module 20 operate in a normal mode.

[0082] Step S72 : sampling input power and sensing element temperature Temp through the transmitting module 10 .

[0083] Step S73: Determine whether the input power Pin is greater than the power threshold P_th or the component temperature Temp is greater than the temperature threshold T_th through the transmitting module 10. If yes, proceed to step S74; if not, proceed to step S78.

[0084] Step S74: Modulate the information about the target output power to the input power through the transmitter module 10. In step S74, the transmitter module 10 switches to the adjustment mode, and in the adjustment mode, controls the transmitter module 10 to interrupt the driving signal PWM for a specific number of times within the charging cycle T, wherein the specific number of times depends on the size of the input power Pin.

[0085] Step S75: Generate input power corresponding to the target output power through the transmitting module 10. It should be noted that if the transmitting module 10 and the receiving module 20 are both in the normal mode, the target output power is equal to the rated power.

[0086] Step S76: receiving and sampling input electric energy through the receiving module 20 to demodulate information about the target output power.

[0087] Step S77: The received input electrical energy is converted into the target output power according to the information about the target output power through the receiving module 20. In the embodiment of the present disclosure, the receiving module 20 learns the specific number of interruptions of the driving signal PWM by sampling the input electrical energy, and reduces the power of the input electrical energy to the target output power according to the number of interruptions. After executing step S77, step S72 will be performed again to continuously detect the input power Pin and the component temperature Temp.

[0088] Step S78: Through the transmitting module 10, determine whether the input power Pin is less than the recovery power P_restore and the component temperature Temp is less than the recovery temperature T_restore. If the step S78 is judged as yes, then return to step S71, wherein the transmitting module 10 returns to the normal mode and the receiving module 20 knows that the transmitting module 10 is running in the normal mode by sampling the input power. If the judgment step S78 is no, then proceed to step S75.

[0089] In one embodiment, step S74 includes: determining the number of interruptions according to the input power Pin or the component temperature Temp; and interrupting the driving signal PWM once in the (i*a)th switching cycle to modulate the information about the target output power in the input power; where a is the number of intervals, 0≦i≦(n-1), i*a is less than or equal to the charging cycle T, n is the number of interruptions, and a, i, and n are positive integers. In this way, the transmitting module 10 can modulate the information about the target output power in the input power.

[0090] In one embodiment, step S76 includes: capturing the falling edge of a switching cycle to the rising edge of the next switching cycle to sample the input power; when the time difference between the falling edge and the rising edge is detected to be greater than half a switching cycle for the first time, starting to accumulate the charging cycle T through the first counter, and starting to accumulate the number of interruptions through the second counter; and when the charging cycle T ends, reading the number of interruptions accumulated by the second counter; wherein when the charging cycle T ends, the first counter and the second counter are reset; wherein the number of interruptions is information about the target output power. In this way, the receiving module 20 can demodulate the information about the target output power.

[0091] pass Figure 7 In the wireless charging method, the transmitting module 10 can actively reduce the power of the input electric energy, and will not immediately start the foreign object detection, low voltage protection and over-temperature protection, which can improve the intermittent power transmission situation.

[0092] Figure 8 It is a flow chart of a wireless charging control method for a transmitting module according to an embodiment of the present disclosure. Figure 1 The transmitting controller 30 and Figure 3 The second transmission control unit 32 may have a built-in memory, and Figure 8 The wireless charging control method can be compiled into program codes and stored in a memory, and includes the following steps.

[0093] Step S81: Sample input power Pin and sensing element temperature Temp.

[0094] Step S82: Determine whether the input power Pin is greater than the power threshold P_th or the component temperature Temp is greater than the temperature threshold T_th. If yes, proceed to step S83; if no, proceed to step S85.

[0095] Step S83: Modulate the information about the target output power to the input power.

[0096] Step S84: Generate input electrical energy corresponding to the target output power.

[0097] Step S85: Determine whether the input power Pin is less than the restoration power P_restore and the component temperature Temp is less than the restoration temperature T_restore. If so, proceed to step S86; if not, proceed to step S84.

[0098] Step S86: The transmitting module 10 returns to the normal mode and generates input power corresponding to the normal output power. Then, the process proceeds to step S81.

[0099] about Figure 8 The details of the wireless charging control method can be found in Figures 1 to 6B The relevant instructions are not repeated here.

[0100] Fig. 9 It is a flow chart of a wireless charging control method for a receiving module according to an embodiment of the present disclosure. Figure 1 The receiving controller 40 and Figure 6B The first receiving control unit 41 may have a built-in memory, and Fig. 9 The wireless charging control method can be compiled into program codes and stored in a memory, and includes the following steps.

[0101] Step S91: sampling input electrical energy.

[0102] Step S92: Determine whether the driving signal PWM is interrupted. If so, proceed to step S93; if not, proceed to step S95.

[0103] Step S93: Demodulate the information about the target output power in the input electric energy.

[0104] Step S94: Convert the input electrical energy into the target output power according to the information about the target output power.

[0105] Step S95: The receiving module 20 operates in the normal mode. Then, the process proceeds to step S91.

[0106] about Fig. 9 The details of the wireless charging control method can be found in Figures 1 to 6B The relevant instructions are not repeated here.

[0107] In summary, the present disclosure provides a wireless charging control method and a wireless charging system, which control the transmitting side circuit to operate in a special adjustment mode when the input power or component temperature of the transmitting side is too high, and the receiving side can know that the transmitting side circuit is operating in the adjustment mode by sampling the received electric energy, and correspondingly reduce the output power, so that the input power can be reduced. In this way, when the distance between the transmitting side and the receiving side increases, the input power can be prevented from excessively increasing and triggering the protection function and interrupting the electric energy transmission, effectively improving the stability of wireless power transmission.

[0108] It should be noted that the above are only preferred embodiments for illustrating the present disclosure, and the present disclosure is not limited to the embodiments described. The scope of the present disclosure is determined by the claims. Moreover, the present disclosure may be modified in various ways by those skilled in the art, but all of them are within the scope of the claims.

Claims

1. A wireless charging control method, used in a wireless charging system including a transmitting module and a receiving module, comprising the steps of: (a) determining, by the transmitting module, a target output power according to the input power or the component temperature when an input power is greater than a power threshold or a component temperature is greater than a temperature threshold; (b) modulating information about the target output power to an input electrical energy through the transmitting module; (c) receiving and sampling the input electric energy through the receiving module to demodulate the information about the target output power; as well as (d) converting the input electrical energy into the target output power according to the information about the target output power through the receiving module.

2. The wireless charging control method as claimed in claim 1, wherein the input power is a pulse width modulation signal, and step (b) comprises: (b1) determining an interruption number according to the input power or the temperature of the component; and (b2) in the (i*a)th switching cycle, interrupting a driving signal of the transmitting module once to modulate the information about the target output power to the input power; Where a is the number of intervals, 0≦i≦(n-1), i*a is less than or equal to a charging cycle, n is the number of interruptions, and a, i, and n are positive integers.

3. The wireless charging control method as claimed in claim 2, wherein step (c) comprises: (c1) capturing a falling edge of one switching cycle to a rising edge of the next switching cycle to sample the input electrical energy; (c2) when it is first detected that the time difference between the falling edge and the rising edge is greater than half a switching cycle, starting to accumulate the charging cycle through a first counter, and starting to accumulate the number of interruptions through a second counter; as well as (c3) when the charging cycle ends, reading the number of interruptions accumulated by the second counter; wherein when the charging cycle ends, the first counter and the second counter are reset; The interruption number is the information about the target output power. 4 . The wireless charging control method as claimed in claim 2 , wherein the number of interruptions indicates that the target output power is (100-n*10)% of a rated power, and n is a positive integer less than 10.

5. The wireless charging control method as claimed in claim 2, wherein the step (b2) comprises: An enabling signal is generated to the transmitting module to interrupt the driving signal.

6. The wireless charging control method according to claim 1, further comprising the steps of: (e) generating the input electrical energy according to the target output power by the transmitting module when at least one of the input power is not lower than a recovery power and the component temperature is not lower than a recovery temperature is satisfied; and (f) receiving and converting the input electrical energy into the target output power through the receiving module.

7. The wireless charging control method according to claim 6, further comprising the steps of: (g) when the input power is lower than the recovery power and the component temperature is lower than the recovery temperature, controlling the transmitting module to return to a normal mode to generate a normal input power; and (h) receiving and sampling the normal input power through the receiving module so as to return the receiving module to the normal mode. 8 . The wireless charging control method as claimed in claim 6 , wherein the restored power is equal to 80% of the power threshold, and the restored temperature is equal to 80% of the temperature threshold.

9. A wireless charging system, comprising: a transmitting module configured to convert an input power into an input electrical energy and then transmit it; and a receiving module configured to receive the input power and convert the input power into output power to a load; The transmitting module and the receiving module are configured to execute the wireless charging control method as claimed in claim 1 .

10. The wireless charging system as claimed in claim 9, wherein the transmitting module comprises: a transmitting controller configured to sample an input power, sense a component temperature and generate a driving signal; a driving circuit electrically connected to the transmitting controller; a switch circuit electrically connected to the driving circuit, wherein the driving circuit and the switch circuit are configured to convert the input power into the input electrical energy according to the driving signal; a transmitting coil, coupled to the switch circuit and configured to transmit the input electrical energy; a first capacitor connected between the switch circuit and the transmitting coil and configured to match the transmitting coil; as well as A second capacitor is connected between the switch circuit and the transmitting coil and is configured to match the transmitting coil.

11. The wireless charging system as claimed in claim 10, wherein the transmitting controller comprises: a first emission control unit, electrically connected to the driving circuit and configured to generate the driving signal to the driving circuit; and A second emission control unit is electrically connected to the driving circuit and is configured to generate an enable signal to the driving circuit according to the input power and the component temperature, wherein the enable signal is used to interrupt the driving signal.

12. The wireless charging system as claimed in claim 9, wherein the receiving module comprises: a receiving coil configured to receive the input electrical energy; a rectifier circuit coupled to the receiving coil; a step-down circuit electrically connected to the rectifier circuit, wherein the rectifier circuit and the step-down circuit are configured to convert the input electrical energy into the output electrical energy; a first receiving control unit, electrically connected to the step-down circuit and the receiving coil, and configured to sample the input electrical energy; a third capacitor electrically connected between the receiving coil and the rectifier circuit and configured to match the receiving coil; and A fourth capacitor is electrically connected between the receiving coil and the rectifier circuit and is configured to match the receiving coil.

13. The wireless charging system as claimed in claim 12, wherein the receiving module further comprises: a communication circuit electrically connected to the receiving coil and configured to reflect an operating state of the receiving module to the transmitting module; a second receiving control unit, electrically connected to the rectifier circuit and the communication circuit, and configured to control the operation of the rectifier circuit and the communication circuit; and A voltage reduction control unit is electrically connected to the voltage reduction circuit and the first receiving control unit and is configured to control the operation of the voltage reduction circuit.

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