Charging systems and electronics

Abstract

The embodiment of the present invention discloses a charging system and an electronic device. The charging system includes a first electronic device and a second electronic device. The first electronic device includes a transmitting coil, and the second electronic device includes a receiving coil. When the receiving coil of the second electronic device is close to the transmitting coil of the first electronic device, the first electronic device transmits electric energy to the second electronic device. When the charging power when the first electronic device transmits electric energy to the second electronic device is less than a preset power threshold, the second electronic device sends a charging power boost signal to the first electronic device. After receiving the charging power boost signal, the first electronic device changes the number of turns of the transmitting coil, or increases the charging voltage, so as to increase the charging power when the first electronic device transmits electric energy to the second electronic device. By adopting the embodiment of the present invention, the charging efficiency of wireless reverse charging can be improved, so that the reverse charging technology has a good user experience and strong applicability.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, and in particular to a charging system and an electronic device. Background Art

[0002] With the continuous development of mobile Internet technology, user equipment (UE) such as mobile phones, tablets or laptops has become one of the indispensable items in people's work and life. Thanks to the continuous improvement of people's user experience of user equipment, wireless charging technology, which is different from traditional wired charging, has emerged. Since wireless charging technology allows the charging process of user equipment to no longer consider the limitation of data cables, it is convenient for users to use. Therefore, wireless charging technology has also become one of the current research hotspots.

[0003] Current wireless charging technologies mainly include forward charging mode and reverse charging mode. For example, when user device A wirelessly charges user device B, user device A outputs wireless charging current to user device B, user device A is in reverse charging mode, and user device B is in forward charging mode. In the prior art, the charging power that can be provided by user devices in reverse charging mode is relatively low, generally maintained at around 2.5W, which obviously cannot meet the charging requirements of user devices in forward charging mode. This results in low charging efficiency and poor user experience of the current wireless reverse charging technology. Summary of the invention

[0004] The embodiments of the present invention provide a charging system and an electronic device. The embodiments of the present invention can improve the charging efficiency of wireless reverse charging, so that the user experience of wireless reverse charging is good and the applicability is strong.

[0005] In a first aspect, an embodiment of the present invention provides a charging system. The charging system includes a first electronic device and a second electronic device. The first electronic device includes a transmitting coil, and the second electronic device includes a receiving coil. When the receiving coil of the second electronic device is close to the transmitting coil of the first electronic device, the first electronic device is configured to transmit electric energy to the second electronic device. The second electronic device is configured to send a charging power boost signal to the first electronic device when the charging power when the first electronic device transmits electric energy to the second electronic device is less than a preset power threshold. The first electronic device is configured to change the number of turns of the transmitting coil or increase the charging voltage of the first electronic device after receiving the charging power boost signal, so as to increase the charging power when the first electronic device transmits electric energy to the second electronic device.

[0006] In an embodiment of the present invention, during the process of wireless reverse charging from a first electronic device to a second electronic device, the first electronic device can increase the charging power when transmitting electrical energy to the second electronic device in real time according to a power increase signal sent by the second electronic device, so that the second electronic device can obtain sufficiently large charging power from the first electronic device, thereby improving the charging efficiency of the entire charging system, making the wireless reverse charging technology more applicable and providing a better user experience.

[0007] In a feasible implementation, the first electronic device further includes a first battery and a first wireless charging module. The first wireless charging module is used to convert the DC voltage provided by the first battery into an AC voltage, and the transmitting coil is used to convert the AC voltage into electrical energy and transmit the converted electrical energy to the second electronic device.

[0008] In a feasible embodiment, at least a first coil tap and a second coil tap are provided on the transmitting coil. The number of coil turns corresponding to the first coil tap is less than the number of coil turns corresponding to the second coil tap. The first wireless charging module includes a coil tap switching module, a first wireless charging conversion module and a first control module. The first control module is used to transmit a coil turn reduction signal to the coil tap switching module when the charging power increase signal is detected based on the first wireless charging conversion module. The coil tap switching module is used to switch the coil tap connected between the transmitting coil and the first wireless charging conversion module from the first coil tap to the second coil tap when the coil turn reduction signal is detected, so as to increase the charging power of the second power supply. The method of increasing the charging power when the first electronic device transmits electric energy to the second electronic device by reducing the number of coil turns is simple and easy to implement.

[0009] In a feasible implementation, the first electronic device further includes a boost module, and one end of the first battery is connected to one end of the first wireless charging conversion module through the boost module. The first control module is used to send a voltage boost signal to the boost module when the charging power boost signal is detected based on the first wireless charging conversion module. The boost module is used to keep the charging current unchanged and increase the charging voltage of the first electronic device after detecting the voltage boost signal, so as to increase the charging power when the first electronic device transmits electric energy to the second electronic device.

[0010] In a feasible implementation, the boost module includes a drive circuit and a voltage boost circuit, and the voltage boost circuit may include a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, a first capacitor and a second capacitor. Here, one end of the first switch tube is connected to one end of the first wireless charging conversion module as the output end of the boost module. One end of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are respectively connected to one end of the drive circuit. The other end of the drive circuit is connected to one end of the first control module. The other end of the first switch tube is respectively connected to the other end of the second switch tube and one end of the first capacitor. Another end of the second switch tube is respectively connected to the other end of the third switch tube and one end of the second capacitor, and is also connected to the first battery as the input end of the boost module. Another end of the third switch tube is respectively connected to the other end of the fourth switch tube and the other end of the first capacitor. Another end of the fourth switch tube is grounded together with the other end of the second capacitor. The boost circuit has a simple structure, is easy to implement, and can also reduce power loss.

[0011] In a feasible implementation, the second electronic device is further configured to transmit a power maintenance signal to the first charging device when detecting that the charging power when the first electronic device transmits electric energy to the second electronic device is equal to a preset power threshold. The first charging device is further configured to trigger, when detecting the power maintenance signal, to maintain the charging power when the first electronic device transmits electric energy to the second electronic device unchanged.

[0012] In a feasible implementation, the second electronic device includes a receiving coil, a second wireless charging module, and a second battery. The receiving coil is used to receive the electric energy transmitted by the transmitting coil and convert the electric energy into an induced AC voltage. The second wireless charging module is used to convert the induced AC voltage into an induced DC voltage and input the induced DC voltage into the second battery.

[0013] In a second aspect, an embodiment of the present invention provides another charging system. The charging system includes a first electronic device and a second electronic device, wherein the first electronic device includes a transmitting coil, and the second electronic device includes a receiving coil. When the receiving coil of the second electronic device is close to the transmitting coil of the first electronic device, the first electronic device is configured to transmit electric energy to the second electronic device. The first electronic device is configured to change the number of turns of the transmitting coil or increase the charging voltage of the first electronic device when a preset power boost cycle arrives, so as to increase the charging power when the first electronic device transmits electric energy to the second electronic device. The second electronic device is configured to send a charging power maintenance signal to the first electronic device when the charging power when the first electronic device transmits electric energy to the second electronic device is equal to a preset power threshold. The first electronic device is also configured to trigger the maintenance of the charging power when the first electronic device transmits electric energy to the second electronic device when the charging power is equal to a preset power threshold.

[0014] In an embodiment of the present invention, during the process of wireless reverse charging from a first electronic device to a second electronic device, the first electronic device may periodically increase the charging power when transmitting electrical energy to the second electronic device, so that the second electronic device can obtain sufficiently large charging power from the first electronic device more quickly, thereby improving the charging efficiency of the entire charging system, making the wireless reverse charging technology more applicable and providing a better user experience.

[0015] In a feasible implementation, the first electronic device includes a transmitting coil, a first wireless charging module and a first battery. The first wireless charging module is used to convert the DC voltage provided by the first battery into an AC voltage, and transmit the AC voltage to the transmitting coil. The transmitting coil is used to convert the AC voltage into electrical energy, and transmit the converted electrical energy to the second electronic device.

[0016] In a feasible embodiment, at least a first coil tap and a second coil tap are provided on the transmitting coil. The number of coil turns corresponding to the first coil tap is less than the number of coil turns corresponding to the second coil tap. The first wireless charging module includes a coil tap switching module, a first wireless charging conversion module and a first control module. The first control module is used to transmit a coil turn reduction signal to the coil tap switching module when it detects that the power boost cycle has arrived. The coil tap switching module is used to switch the coil tap connected between the transmitting coil and the first wireless charging conversion module from the first coil tap to the second coil tap when it detects the coil turn reduction signal, so as to increase the charging power of the second power supply.

[0017] In a feasible implementation, the first electronic device further includes a boost module, and one end of the first battery is connected to one end of the first wireless charging conversion module through the boost module. The first control module is used to send a voltage boost signal to the boost module when it detects that the power boost cycle has arrived. The boost module is used to keep the charging current unchanged and increase the charging voltage of the first electronic device after detecting the voltage boost signal, so as to increase the charging power when the first electronic device transmits electric energy to the second electronic device.

[0018] In a feasible embodiment, the boost module includes a drive circuit and a voltage boost circuit, and the voltage boost circuit may include a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, a first capacitor and a second capacitor. Here, one end of the first switch tube is connected to one end of the first wireless charging conversion module as the output end of the boost module. One end of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are respectively connected to one end of the drive circuit. The other end of the drive circuit is connected to one end of the first control module. The other end of the first switch tube is respectively connected to the other end of the second switch tube and one end of the first capacitor. Another end of the second switch tube is respectively connected to the other end of the third switch tube and one end of the second capacitor, and is also connected to the first battery as the input end of the boost module. Another end of the third switch tube is respectively connected to the other end of the fourth switch tube and the other end of the first capacitor, and another end of the fourth switch tube is grounded together with the other end of the second capacitor.

[0019] In a feasible implementation, the second electronic device further includes a receiving coil, a second wireless charging module, and a second battery. The receiving coil is used to receive the electric energy transmitted by the transmitting coil, and convert the electric energy transmitted by the transmitting coil into an induced AC voltage. The second wireless charging module is used to convert the induced AC voltage into an induced DC voltage, and input the induced DC voltage into the second battery.

[0020] In a third aspect, an embodiment of the present invention provides an electronic device. The electronic device includes a battery and a transmitting coil;

[0021] When the receiving coil of the receiving device is close to the transmitting coil of the electronic device, the electronic device is configured to transmit electric energy to the receiving device. The electronic device is also configured to change the number of turns of the transmitting coil or increase the charging voltage of the electronic device after detecting the charging power boost signal sent by the receiving device, so as to increase the charging power when transmitting electric energy to the receiving device. The power boost signal is sent by the receiving device when it detects that the charging power is less than a preset power threshold.

[0022] In a feasible implementation, the electronic device further includes a first wireless charging module. The first wireless charging module is used to convert the DC voltage provided by the battery into an AC voltage, and the transmitting coil is used to convert the AC voltage into electrical energy and transmit the converted electrical energy to the receiving device.

[0023] In a feasible embodiment, at least a first coil tap and a second coil tap are provided on the transmitting coil, the number of coil turns corresponding to the first coil tap is less than the number of coil turns corresponding to the second coil tap, and the first wireless charging module includes a coil tap switching module, a first wireless charging conversion module and a first control module. The first control module is used to transmit a coil turn reduction signal to the coil tap switching module when the charging power increase signal is detected based on the first wireless charging conversion module. The coil tap switching module is used to switch the coil tap connected between the transmitting coil and the first wireless charging conversion module from the first coil tap to the second coil tap when the coil turn reduction signal is detected, so as to increase the charging power when transmitting electric energy to the receiving device.

[0024] In a feasible implementation, the electronic device further includes a boost module, and one end of the battery is connected to one end of the first wireless charging conversion module through the boost module. The first control module is used to send a voltage boost signal to the boost module when the charging power boost signal is detected based on the first wireless charging conversion module. The boost module is used to keep the charging current unchanged and increase the charging voltage of the electronic device after detecting the voltage boost signal, so as to increase the charging power when transmitting electric energy to the receiving device.

[0025] In a feasible implementation, the boost module includes a drive circuit and a voltage boost circuit, and the voltage boost circuit may include a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, a first capacitor and a second capacitor. Here, one end of the first switch tube is connected to one end of the first wireless charging conversion module as the output end of the boost module. One end of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are respectively connected to one end of the drive circuit. The other end of the drive circuit is connected to one end of the first control module. The other end of the first switch tube is respectively connected to the other end of the second switch tube and one end of the first capacitor. Another end of the second switch tube is respectively connected to the other end of the third switch tube and one end of the second capacitor, and is also connected to the battery as the input end of the boost module. Another end of the third switch tube is respectively connected to the other end of the fourth switch tube and the other end of the first capacitor. Another end of the fourth switch tube is grounded together with the other end of the second capacitor.

[0026] In a feasible implementation, the electronic device is further configured to trigger, when a power hold signal is detected, to maintain the charging power of the electronic device when transmitting electrical energy to the receiving device. Here, the power hold signal is sent when the receiving device detects that the charging power is equal to a preset power threshold.

[0027] In a fourth aspect, an embodiment of the present invention provides an electronic device, which may be the second electronic device provided in the first or second aspect, or the receiving device provided in the third aspect. The electronic device may include the functional modules included in the second electronic device provided in the first or second aspect, and may also implement the functions that can be implemented by the functional modules included in the second electronic device provided in the first or second aspect. The electronic device may also include the functional modules included in the receiving device provided in the third aspect, and may also implement the functions possessed by the functional modules included in the receiving device provided in the third aspect.

[0028] Based on the implementations provided in the above aspects, the present invention can be further combined to provide more implementations. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a structural schematic diagram of a charging system provided by an embodiment of the present invention;

[0030] Figure 2 is another structural schematic diagram of a charging system provided by an embodiment of the present invention;

[0031] Figure 3 is another structural schematic diagram of a charging system provided by an embodiment of the present invention;

[0032] Figure 4 is a structural schematic diagram of a first charging device provided in an embodiment of the present invention;

[0033] Figure 5 is another structural schematic diagram of the first charging device provided by an embodiment of the present invention;

[0034] Figure 6 It is a schematic diagram of the structure of a boost module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0036] See also Figure 1 , Figure 1 1 is a schematic diagram of a wireless charging system provided by an embodiment of the present invention. The wireless charging system may include a first electronic device 10 and a second electronic device 20. Here, the first electronic device 10 is mainly used to transmit power to the second electronic device 20. The second electronic device 20 can charge the second battery contained therein based on the power it receives. That is, in the case of Figure 1 In the wireless charging scenario shown, the first electronic device 10 operates in a wireless reverse charging mode, and the second electronic device 20 operates in a wireless forward charging mode. It can be understood that, depending on the specific scenario, the first electronic device 10 may also operate in a wireless forward charging mode, and the second electronic device 20 may also operate in a wireless reverse charging mode. In this embodiment, the scenario in which the first electronic device 10 operates in a wireless reverse charging mode and the second electronic device 20 operates in a wireless forward charging mode is described. Optionally, the first electronic device 10 and the second electronic device 20 may be electronic devices that support wireless charging and wireless discharging functions, such as smart phones, tablet computers, vehicle-mounted devices, or smart wearable devices.

[0037] In practical applications, please refer to Figure 2 , Figure 2 FIG. 1 is another structural diagram of a charging system provided by an embodiment of the present invention. Figure 2It can be known that the first electronic device 10 may include a transmitting coil 101, a first wireless charging module 102 and a first battery 103. Here, one end of the first battery 103 is connected to one end of the first wireless charging module 102, and the other end of the first wireless charging module 102 is connected to one end of the transmitting coil 101. The second electronic device 20 may include a receiving coil 201, a second wireless charging module 202 and a second battery 203. One end of the receiving coil 201 is connected to one end of the second wireless charging module 202, and the other end of the second wireless charging module 202 is connected to one end of the second battery 203. Exemplarily, the first battery 103 and the second battery 203 may be batteries or battery packs for storing electrical energy, which are not limited here. Before starting to transmit electrical energy to the second electronic device 20, the first electronic device 10 may periodically transmit a detection signal, which is used to detect whether there are devices that need to be charged around the first electronic device 10. The second electronic device 20 that needs to be charged can transmit a response signal corresponding to the detection signal after it approaches the first electronic device 10 (that is, the transmitting coil 101 and the receiving coil 201 are close to each other) and receives the above-mentioned detection signal. After receiving the response signal corresponding to the detection signal, the first electronic device 10 can determine that the second electronic device 20 needs to be charged, and then can achieve a radio connection with the second electronic device 20 through electromagnetic coupling. After the first electronic device 10 and the second electronic device 20 achieve a radio connection through electromagnetic coupling, the first wireless charging module 102 performs power control, inversion, voltage stabilization, filtering and other transformation processes on the direct current provided by the first battery 103 to obtain an alternating current with a fixed power. The transmitting coil 101 can convert the alternating current into electromagnetic energy and transmit it to the receiving coil 201. The receiving coil 201 can convert the received electromagnetic energy into electrical energy (that is, into induced alternating current) and transmit the induced alternating current to the second wireless charging module 202. The second wireless charging module 202 can perform power control, rectification, voltage stabilization, filtering and other transformation processing on the induced alternating current to obtain an induced direct current with fixed power, and charge the second battery 203 through the induced direct current to realize the transmission of electric energy from the first electronic device to the second electronic device. Here, it should be noted that the transmitting coil 101 can specifically transmit electric energy to the receiving coil 201 by electromagnetic induction, magnetic resonance transmission and the like, which are not limited here. For example, when the first wireless charging module 102 inputs the fixed-power alternating current into the transmitting coil 101, the transmitting coil will generate a constantly changing magnetic field, and the receiving coil 201 in this changing magnetic field can generate induced alternating current, thereby realizing the transfer of electric energy. In the embodiment of the present invention, the electromagnetic induction type power transmission method is used as an example for description.

[0038] For further information, please see Figure 3 , Figure 3 FIG. 1 is another structural diagram of a charging system provided by an embodiment of the present invention. Figure 3 It can be seen that the first wireless charging module 102 may specifically include a first control module 121 and a first wireless charging conversion module 122. The second wireless charging module 202 may specifically include a second control module 221 and a second wireless charging conversion module 222. Here, the first control module 121 and the second control module 221 may specifically be a system-on-chip (SOC) with data processing capabilities. The first wireless charging conversion module 122 and the second wireless charging conversion module 222 may specifically be a wireless charging integrated chip with functions such as inversion, rectification, and filtering, which are not limited here.

[0039] In a possible implementation, during the process of wireless charging from the first electronic device 10 to the second electronic device 20, the second control module 221 can detect in real time the charging power when the first electronic device 10 transmits electric energy to the second electronic device 20. Specifically, the second control module 221 can detect the charging current and charging voltage of the second battery 203 charged by the second wireless charging conversion module 222, and then calculate the input electric power of the second battery 203 according to the charging current and charging voltage. Then, when the second control module 221 determines that the charging power when transmitting electric energy is less than a preset charging power threshold, a power boost signal can be sent to the first electronic device 10 through the receiving coil 201. The power boost signal is used to instruct the first electronic device 10 to trigger the boosting of the charging power when transmitting electric energy. Specifically, when the second control module 221 determines that the charging power when transmitting electric energy is less than the preset charging power threshold, a first instruction can be sent to the second wireless charging conversion module 222, and the first instruction is used to instruct the second wireless charging conversion module 222 to generate alternating current of a specific frequency. After generating the alternating current, the second wireless charging conversion module 222 can input the alternating current into the receiving coil 201. The receiving coil 201 can generate a radio signal T corresponding to the power boost signal and send it to the first electronic device 10. After receiving the radio signal T, the transmitting coil 101 in the first electronic device 10 can convert it into a corresponding alternating current signal and transmit it to the first wireless charging conversion module 121. The first wireless charging conversion module 122 can convert the alternating current signal into the above-mentioned power boost signal and transmit it to the first control module 121. After detecting the power boost signal, the first control module 121 can trigger the increase of the charging power when transmitting electric energy. Here, the first electronic device increases the charging power when the first electronic device transmits electric energy to the second electronic device in a step-by-step manner according to the power boost signal sent by the second electronic device, which can ensure that the output power provided by the first electronic device can gradually meet the charging requirements of the second electronic device, ensure the smooth execution of wireless reverse charging, and improve the stability of the entire charging system.

[0040] Optionally, the preset charging power threshold may be an empirical value set based on the circuit structure and working environment of the second electronic device. Preferably, the preset charging power threshold may specifically be the maximum input electric power allowable by the second battery.

[0041] Optionally, please also refer to Figure 4 , Figure 4 which is a schematic structural diagram of the first electronic device provided by an embodiment of the present invention. As Figure 4 can be seen, at least a first coil tap (such as tap 1) and a second coil tap (such as tap 2) are provided on the transmitting coil 101. The coil turns corresponding to the first coil tap are fewer than those corresponding to the second coil tap. It can be understood that the number of coil taps provided on the transmitting coil 101 can be determined according to specific implementation scenarios. In this embodiment, an example of the transmitting coil having 3 coil taps is described. The first wireless charging module 102 further includes a coil tap switching module 123. The coil tap switching module 123 includes switches S1, S2, and S3. Here, the switches S1, S2, and S3 can be electronic switches or mechanical switches, which are not limited herein. One end of the first wireless charging conversion module 122 is connected to one end of the transmitting coil 101 through a capacitor C1, and the other end of the first wireless charging conversion module 122 is connected to tap 1, tap 2, and tap 3 on the transmitting coil through the switches S1, S2, and S3 respectively. It should be noted here that tap 1, tap 2, and tap 3 on the transmitting coil 101 are three taps at different positions on the transmitting coil 101, corresponding to three different coil turns of the transmitting coil 101. Assume they are N1, N2, and N3 respectively, where N1 < N2 < N3. For example, assume switch S1 is closed and switches S2 and S3 are in the off state, then one end of the first wireless charging conversion module 122 is connected to tap 1 through switch S1, and at this time the coil turns of the transmitting coil are N1. Similarly, if one end of the first wireless charging conversion module 122 is connected to tap 2 through switch S2, the coil turns of the transmitting coil 101 are N2 at this time, and if one end of the first wireless charging conversion module 122 is connected to tap 3 through switch S3, the coil turns of the transmitting coil 101 are N3 at this time. Here, the number of taps on the transmitting coil and the number of switches in the coil tap switching circuit can be adjusted according to the actual application scenario, not limited to 3, and can also be more. The embodiment of the present invention only takes the scenario of 3 taps and switches as an example for illustration, without any limiting effect.

[0042] Next, in combination with Figure 4A process of triggering an increase in the input electric power of the second battery 203 for the first electronic device 10 is described. When the first control module 121 detects the above-mentioned power increase signal, the first control module 121 may send an instruction (hereinafter referred to as the second instruction for description) to the first wireless charging conversion module 122. The second instruction is used to trigger the first wireless charging conversion module 122 to control the conduction or disconnection of the switch S1, switch S2, and switch S3, so as to reduce the turns ratio between the transmitting coil 101 and the receiving coil 201, thereby increasing the charging power when transmitting electric energy. It should be noted here that according to the principle of electromagnetic induction wireless charging, the ratio of the effective value U1 of the alternating voltage on the transmitting coil 101 to the effective value U2 of the induced voltage on the receiving coil 201 is equal to the ratio of the number of turns Nt of the transmitting coil 101 to the number of turns Nr of the receiving coil 201, that is, U1 / U2 = Nt / Nr. Specifically, assuming that the first electronic device starts to charge the second electronic device reversely, the switch S3 is conducting, the switches S1 and S2 are in the off state, and the number of turns of the receiving coil 201 is N4. At this time, U1 / U2 = N3 / N4. After receiving the second instruction, the first wireless charging conversion module 122 controls the switch S3 to turn off and the switch S2 to turn on. In this way, the turns ratio between the transmitting coil 101 and the receiving coil 201 changes from the original N3 / N4 to N2 / N4. And because N2 < N3, this makes the value of U1 / U2 also become smaller. Since the value of the effective voltage U1 of the transmitting coil 101 does not change, this will cause the value of U2 to increase, that is, the effective value of the induced alternating voltage in the receiving coil 201 becomes larger. This will further make the power of the charging voltage converted by the second wireless charging conversion module 221 become larger, and ultimately make the charging power when transmitting electric energy become larger. Optionally, the differences between N1, N2, and N3 can be equal, so that the power difference of the charging power increased each time when transmitting electric energy is the same, which can avoid the charging power being too large when transmitting electric energy due to the charging power increased in a single time being too large.

[0043] In another possible implementation, please also refer to Figure 5 , Figure 5 which is another structural schematic diagram of the first electronic device provided by the embodiment of the present invention. As Figure 5 can be seen, the first wireless charging module 102 further includes a boost module 124. One end of the first battery 103 is connected to one end of the first wireless charging conversion module 122 through one end of the boost module 124. The boost module 124 is used to boost the DC voltage provided by the first battery. Without changing the magnitude of the current of this direct current, it makes the transmitting electric power of the transmitting coil 101 become larger, thereby making the effective value of the induced alternating voltage in the receiving coil 201 increase, and ultimately making the charging power when transmitting electric energy become larger.

[0044] For specific implementation, please refer to Figure 6 , Figure 6 is a schematic diagram of the structure of the boost module 124 provided in an embodiment of the present invention. Figure 6 It can be known that the boost module 124 may include a drive circuit and a voltage boost circuit. The voltage boost circuit may include a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4. One end of the first switch tube Q1 is connected to one end of the first wireless charging conversion module 122 as the voltage output end of the boost module 124. One end of the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 are respectively connected to one end of the drive circuit, and the other end of the drive circuit is connected to one end of the first control module 121 to access the drive control signal provided by the first control module 121. One end of the first switch tube Q1 is connected to one end of the first wireless charging conversion module 122 as the output end of the voltage boost circuit, and the other end of the first switch tube Q1 is respectively connected to one end of the second switch tube Q2 and one end of the first capacitor C2. The other end of the second switch tube Q2 is connected to one end of the third switch tube Q3 and one end of the energy storage capacitor C3, and is connected to the first battery 103 as the voltage input end of the voltage boost circuit. The other end of the third switch tube Q3 is connected to one end of the fourth switch tube Q4 and the other end of the first capacitor C2 respectively. The other end of the fourth switch tube Q4 and the other end of the second capacitor C3 are grounded at the same time.

[0045] Combine the following Figure 6The boost module 124 described above describes the process of the first electronic device 10 triggering the boost of the input electric power of the second battery 203. When the first control module 121 detects the above power boost signal, it can send a drive control signal to the drive circuit to instruct the drive circuit to provide a drive signal to the four switch tubes in the voltage boost circuit. For example, after receiving the above drive control signal, the drive circuit can drive the first switch tube Q1 and the third switch tube Q3 to turn on, and the second switch tube Q2 and the fourth switch tube Q4 are in the off state. At this time, the energy storage capacitors C2 and C3 are in a charged state, and their capacitor voltages can eventually be equal to the input voltage of the voltage boost circuit (i.e., the output voltage of the charging power supply). Then, the drive circuit can drive the second switch tube Q2 and the fourth switch tube Q4 to turn on, and the third switch tube Q3 is in the off state. At this time, C2 and C3 are in a discharge state, and the output current of the voltage boost circuit remains unchanged, and the output voltage is equal to the sum of the discharge voltages of the capacitors C2 and C3, that is, the output voltage of the voltage boost circuit is equal to twice the input voltage, and the input voltage is doubled. When the output current remains unchanged, the boost module 124 can increase the input voltage of the first wireless charging conversion module 122, thereby increasing the effective value of the AC voltage in the transmitting coil 101. When the turns ratio of the transmitting coil 101 and the receiving coil 201 remains unchanged, the effective value of the induced voltage in the receiving coil 201 can be increased, and finally the charging power during the transmission of electric energy is improved. Preferably, the above-mentioned switching tube can be specifically a field effect transistor (FET), a triode, etc., which is not limited at this time. The use of the above-mentioned boost module 124 to increase the charging power during the transmission of electric energy has a simple circuit, is easy to implement, and can also reduce power loss.

[0046] It should be noted that the driving circuit and voltage boosting circuit described in the embodiment of the present invention are only a feasible implementation of the boost module 124 and do not have a limiting effect. In practical applications, the boost module 124 can also be a boost chopper circuit, a switch-type boost converter, etc., which is not limited here.

[0047] Optionally, in practical applications, the boost module 124 can also be formed by cascading multiple voltage boost circuits to achieve different multiples of boost. For example, the boost module 124 can include two of the above voltage boost circuits, and the output end of the first voltage boost circuit is connected to the input end of the second voltage boost circuit. Under the coordinated drive of the driving circuit, a 4-fold boost can be achieved. Similarly, a 6-fold boost, an 8-fold boost, etc. can be achieved by cascading multiple voltage boost circuits, which are not limited here. The gain of the boost module can be adjusted according to the actual application scenario. It can be understood that the flexibility of the boost module can also be improved by cascading the voltage boost circuit. For example, assuming that the boost module 124 is formed by cascading the two above voltage boost circuits, according to different driving signals, the boost module 124 can achieve a 2-fold boost (such as a voltage boost circuit gain control of 1, and another voltage boost circuit gain control of 2), or a 4-fold boost (such as the gains of both voltage boost circuits are controlled to 2).

[0048] It should be noted that, in actual applications, after the first electronic device 10 receives a voltage boost signal sent by the second electronic device 20 and triggers the boost of the charging power when transmitting electric energy, if the second electronic device 20 determines that the charging power when transmitting electric energy is still less than the above-mentioned preset charging power threshold, it can continue to send a new power boost signal to the first electronic device 10, so that the first electronic device 10 triggers the boost of the charging power when transmitting electric energy again. Until the second electronic device 20 determines that the charging power when transmitting electric energy is equal to the above-mentioned preset charging power threshold, it stops sending a new power boost signal to the first electronic device 10, so that the first electronic device 10 does not need to trigger the boost of the input electric power of the second battery 203. For example, assume that the input electric power of the second battery 203 at the current moment is 5W. After detecting the power boost signal transmitted by the second electronic device 20, the first control module 121 can increase the charging power when transmitting electric energy from 5W to 5.5W through the two power boost methods described above. After the power boost is achieved, the above-mentioned first control module 121 can continue to detect whether a new power boost signal is received. If the first electronic device 10 receives a new power boost signal again, it triggers the charging power during power transmission to be increased from 5.5W to 6W. And so on, until the second electronic device 20 determines that the charging power during power transmission is equal to the above-mentioned preset charging power threshold. Here, the first electronic device increases the charging power during power transmission in a step-by-step manner according to the power boost signal sent by the second electronic device, which can ensure the steady increase of the charging power during power transmission, so that the wireless reverse charging can be smoothly executed, and the stability of the entire charging system can be improved.

[0049] Optionally, when the second electronic device 20 determines that the charging power when transmitting electric energy is equal to the above-mentioned preset charging power threshold, it can also send a power maintenance signal to the first electronic device 10 to instruct the first electronic device 10 to stop triggering the operation of increasing the charging power when transmitting electric energy, and maintain the charging power when transmitting electric energy at the current moment unchanged.

[0050] In another feasible implementation, the first electronic device 10 can actively trigger the increase of the charging power when transmitting electric energy. Specifically, during the reverse charging process of the first electronic device 10 for the second electronic device 20, the second control module 221 can detect in real time whether the charging power when transmitting electric energy is equal to the above-mentioned preset power threshold. If the second control module 221 detects that the charging power when transmitting electric energy is equal to the above-mentioned preset power threshold, it sends a power maintenance signal to the first electronic device 10 so that the first electronic device 10 stops triggering the operation of increasing the charging power when transmitting electric energy. Before detecting the power maintenance signal, the first control module 101 can periodically trigger the operation of increasing the charging power when transmitting electric energy. Here, the specific input electric power improvement process can refer to the process of increasing the charging power when transmitting electric energy by reducing the coil turns ratio and increasing the voltage by the boost module as described above, which will not be repeated here. For example, before detecting the power maintenance signal, the above-mentioned first control module 101 can trigger the charging power when transmitting electric energy to increase a preset power difference when the preset power boost cycle arrives. Then, when the next power boost cycle arrives, the power difference is increased again by the same magnitude until the first control module 101 detects the power maintenance signal transmitted by the second electronic device 20, and stops the operation of periodically increasing the charging power during power transmission. Actively and periodically increasing the charging power during power transmission can increase the charging power during power transmission to the preset power threshold more quickly, avoiding the time delay caused by step-by-step charging power increase, and improving the charging efficiency of the charging system.

[0051] In another feasible implementation, in the scenario where the first electronic device 10 actively triggers to increase the input power of the second battery 203, the first electronic device 10 can indirectly detect whether the power maintenance signal fed back by the second electronic device 20 is received by detecting the transmission power of the transmitting coil 101, thereby determining whether the charging power when transmitting electric energy is equal to the preset charging power threshold. The first electronic device 10 can detect whether the transmission power of the transmitting coil 101 is increasing through the first control module 121. Here, it should be noted that when the wireless transmission efficiency of electric energy is stable, the transmission power of the transmitting coil 101 is proportional to the receiving power of the receiving coil 201. In other words, the transmission power of the transmitting coil 101 will increase as the receiving power of the receiving coil 201 increases. After the first electronic device 10 actively triggers to increase the input power of the second battery 203 for the first time, the first electronic device 10 can detect whether the transmission power of the transmitting coil 101 is increasing through the first control module 121. If the first control module 121 detects that the transmission power of the transmitting coil 101 is increasing, it means that the power of the receiving coil is increasing, and the first electronic device 10 can determine that the charging power during the transmission of electric energy has not reached the preset charging power threshold, and the first electronic device 10 can continue to actively trigger the increase of the input power of the second battery 203 until the first control module 121 detects that the transmission power of the transmitting coil 101 stops increasing. By detecting whether the transmission power of the transmitting coil 101 increases to detect whether the charging power during the transmission of electric energy reaches the preset charging power threshold, it is determined whether to trigger the increase of the charging power during the transmission of electric energy, which can avoid the adverse effects caused by the wireless communication failure between the first electronic device 10 and the second electronic device 20, and improve the applicability of the charging system.

[0052] In another feasible implementation, the first electronic device 10 can also detect in real time through the first control module 121 whether the transmission power of the transmitting coil 101 is greater than or equal to the preset rated transmission power during the process of increasing the charging power during the transmission of electric energy through the boost module 124. Here, the rated transmission power can be the maximum transmission power of the transmitting coil 101 when it is in a normal working state. If the first control module 121 detects that the transmission power of the transmitting coil 101 is greater than or equal to the rated transmission power, it can stop increasing the reverse charging input voltage, that is, it will no longer increase the input voltage of the first wireless charging conversion module 122. At this time, if the first electronic device 10 receives a new power increase signal, the first control module 121 can also control the first wireless charging conversion module 122 to switch the tap connected to the transmitting coil 101 to reduce the coil turns ratio of the transmitting coil 101 and the receiving coil 201, so as to continue to increase the charging power during the transmission of electric energy until it is equal to the preset charging power threshold. By effectively combining the two power boosting methods of boosting based on the boost module 124 and reducing the coil turns ratio of the transmitting coil 101 and the receiving coil 201, the first electronic device 10 can provide appropriate charging power for the second battery 203 while improving the stability and safety of the entire charging system.

[0053] It should be noted that, in the embodiment of the present invention, the first and second before the first charging circuit and the second charging circuit are only used to distinguish different charging circuits and do not have other limiting functions. Similarly, the first and second before the names of the first control module and the second control module do not have other limiting functions and will not be described one by one here.

[0054] It should be noted that an embodiment of the present invention further provides an electronic device and a receiving device. The electronic device may be the first electronic device 10, and the receiving device may be the second electronic device 20. The electronic device can implement the functions of the first electronic device, and the receiving device can implement the functions of the second electronic device 20. The specific function implementation can be found above, and will not be repeated here.

[0055] In the embodiment of the present invention, "first" and "second" etc. are used to distinguish different objects, or to distinguish different processing of the same object, rather than to describe a specific order of objects.

[0056] In the embodiments of the present invention, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete way.

[0057] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in this application, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A charging system, characterized in that: The charging system comprises a first electronic device and a second electronic device, wherein the first electronic device comprises a transmitting coil and the second electronic device comprises a receiving coil; When the receiving coil of the second electronic device is close to the transmitting coil of the first electronic device, the first electronic device is configured to transmit power to the second electronic device; The second electronic device is configured to send a charging power boost signal to the first electronic device when the charging power when the first electronic device transmits electric energy to the second electronic device is less than a preset power threshold; The first electronic device is configured to, after receiving the charging power increase signal, change the number of turns of the transmitting coil, or increase the charging voltage of the first electronic device, so as to increase the charging power when the first electronic device transmits electric energy to the second electronic device; The second electronic device is further configured to transmit a power holding signal to the first electronic device when detecting that the charging power when the first electronic device transmits electric energy to the second electronic device is equal to a preset power threshold; The first electronic device is further configured to trigger, when detecting the power maintenance signal, maintaining a charging power level unchanged when the first electronic device transmits electric energy to the second electronic device.

2. The charging system according to claim 1, characterized in that: The first electronic device also includes a first battery and a first wireless charging module; The first wireless charging module is used to convert the DC voltage provided by the first battery into an AC voltage, and the transmitting coil is used to convert the AC voltage into electrical energy and transmit the converted electrical energy to the second electronic device.

3. The charging system according to claim 2, characterized in that: The transmitting coil is provided with at least a first coil tap and a second coil tap, the number of coil turns corresponding to the first coil tap is greater than the number of coil turns corresponding to the second coil tap, and the first wireless charging module includes a coil tap switching module, a first wireless charging conversion module and a first control module; The first control module is used to transmit a coil turns reduction signal to the coil tap switching module when the charging power increase signal is detected based on the first wireless charging conversion module; The coil tap switching module is used to switch the coil tap connected between the transmitting coil and the first wireless charging conversion module from the first coil tap to the second coil tap when the coil turns reduction signal is detected, so as to increase the charging power of the second electronic device.

4. The charging system according to claim 3, characterized in that: The first electronic device further includes a boost module, and one end of the first battery is connected to one end of the first wireless charging conversion module through the boost module; The first control module is used to send a voltage boost signal to the boost module when the charging power boost signal is detected based on the first wireless charging conversion module; The boost module is used to keep the charging current unchanged and increase the charging voltage of the first electronic device after detecting the voltage boost signal, so as to increase the charging power when the first electronic device transmits electric energy to the second electronic device.

5. The charging system according to claim 4, characterized in that: The boost module includes a driving circuit and a voltage boost circuit, and the voltage boost circuit includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, a first capacitor and a second capacitor; Wherein: one end of the first switch tube is connected to one end of the first wireless charging conversion module as the output end of the boost module, one end of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are respectively connected to one end of the drive circuit, the other end of the drive circuit is connected to one end of the first control module, the other end of the first switch tube is respectively connected to the other end of the second switch tube and one end of the first capacitor, another end of the second switch tube is respectively connected to the other end of the third switch tube and one end of the second capacitor, and is also connected to the first battery as the input end of the boost module, another end of the third switch tube is respectively connected to the other end of the fourth switch tube and the other end of the first capacitor, another end of the fourth switch tube and the other end of the second capacitor are commonly grounded, the drive circuit is used to provide a drive signal for the first switch tube, the second switch tube, the third switch tube and the fourth switch tube, and the preset power threshold is the maximum input power allowed by the second battery in the second electronic device.

6. The charging system according to claim 5, characterized in that: The second electronic device also includes a receiving coil and a second wireless charging module; The receiving coil is used to receive the electric energy transmitted by the transmitting coil and convert the electric energy into an induced AC voltage; The second wireless charging module is used to convert the induced AC voltage into an induced DC voltage, and input the induced DC voltage into the second battery.

7. A charging system, characterized in that: The charging system comprises a first electronic device and a second electronic device, the first electronic device comprises a transmitting coil and a first control module, and the second electronic device comprises a receiving coil; When the receiving coil of the second electronic device is close to the transmitting coil of the first electronic device, the first electronic device is configured to transmit power to the second electronic device; The first electronic device is configured to, when a preset power boost period arrives, change the number of turns of the transmitting coil, or increase the charging voltage of the first electronic device, so as to increase the charging power when the first electronic device transmits electric energy to the second electronic device; The first electronic device is further configured to, when detecting through the first control module that the transmission power of the transmitting coil stops increasing, determine that the charging power when the first electronic device transmits electric energy to the second electronic device is equal to a preset power threshold, triggering the maintenance of the charging power size when the first electronic device transmits electric energy to the second electronic device unchanged.

8. The charging system according to claim 7, characterized in that: The first electronic device also includes a first wireless charging module and a first battery; The first wireless charging module is used to convert the DC voltage provided by the first battery into an AC voltage, and transmit the AC voltage to the transmitting coil; The transmitting coil is used to convert the AC voltage into electrical energy and transmit the converted electrical energy to the second electronic device.

9. The charging system according to claim 8, characterized in that: The transmitting coil is provided with at least a first coil tap and a second coil tap, the number of coil turns corresponding to the first coil tap is greater than the number of coil turns corresponding to the second coil tap, and the first wireless charging module includes a coil tap switching module, a first wireless charging conversion module and the first control module; The first control module is used for transmitting a coil turns reduction signal to the coil tap switching module when detecting that the power boost cycle has arrived; The coil tap switching module is used to switch the coil tap connected between the transmitting coil and the first wireless charging conversion module from the first coil tap to the second coil tap when the coil turns reduction signal is detected, so as to increase the charging power of the second electronic device.

10. The charging system according to claim 9, characterized in that: The first electronic device further includes a boost module, and one end of the first battery is connected to one end of the first wireless charging conversion module through the boost module; The first control module is used to send a voltage boost signal to the boost module when detecting that the power boost cycle has arrived; The boost module is used to keep the charging current unchanged and increase the charging voltage of the first electronic device after detecting the voltage boost signal, so as to increase the charging power when the first electronic device transmits electric energy to the second electronic device.

11. The charging system according to claim 10, characterized in that: The boost module includes a driving circuit and a voltage boost circuit, and the voltage boost circuit includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, a first capacitor and a second capacitor; Among them: one end of the first switch tube is connected to one end of the first wireless charging conversion module as the output end of the boost module, one end of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are respectively connected to one end of the drive circuit, the other end of the drive circuit is connected to one end of the first control module, the other end of the first switch tube is respectively connected to the other end of the second switch tube and one end of the first capacitor, another end of the second switch tube is respectively connected to the other end of the third switch tube and one end of the second capacitor, and is also connected to the first battery as the input end of the boost module, another end of the third switch tube is respectively connected to the other end of the fourth switch tube and the other end of the first capacitor, and another end of the fourth switch tube and the other end of the second capacitor are commonly grounded.

12. The charging system according to any one of claims 8 to 11, characterized in that: The second electronic device also includes a second wireless charging module and a second battery; The receiving coil is used to receive the electric energy transmitted by the transmitting coil and convert the electric energy transmitted by the transmitting coil into an induced AC voltage; The second wireless charging module is used to convert the induced AC voltage into an induced DC voltage, and input the induced DC voltage into the second battery.

13. An electronic device, characterized in that: The electronic device comprises a battery and a transmitting coil; When the receiving coil of the receiving device is close to the transmitting coil of the electronic device, the electronic device is configured to transmit power to the receiving device; The electronic device is further configured to, after detecting a charging power boost signal sent by the receiving device, change the number of turns of the transmitting coil, or increase the charging voltage of the electronic device, so as to increase the charging power when transmitting electric energy to the receiving device, wherein the charging power boost signal is sent by the receiving device when detecting that the charging power is less than a preset power threshold; The electronic device is also configured to, when a power hold signal is detected, trigger the maintenance of the charging power level when the electronic device transmits electrical energy to the receiving device, wherein the power hold signal is sent when the receiving device detects that the charging power is equal to a preset power threshold, and the preset power threshold is the maximum input power allowed by the second battery in the receiving device.

14. The electronic device according to claim 13, characterized in that: The electronic device also includes a first wireless charging module; The first wireless charging module is used to convert the DC voltage provided by the battery into an AC voltage, and the transmitting coil is used to convert the AC voltage into electrical energy and transmit the converted electrical energy to the receiving device.

15. The electronic device according to claim 14, characterized in that: The transmitting coil is provided with at least a first coil tap and a second coil tap, the number of coil turns corresponding to the first coil tap is greater than the number of coil turns corresponding to the second coil tap, and the first wireless charging module includes a coil tap switching module, a first wireless charging conversion module and a first control module; The first control module is used to transmit a coil turns reduction signal to the coil tap switching module when the charging power increase signal is detected based on the first wireless charging conversion module; The coil tap switching module is used to switch the coil tap connected between the transmitting coil and the first wireless charging conversion module from the first coil tap to the second coil tap when detecting the coil turns reduction signal, so as to increase the charging power when transmitting electric energy to the receiving device.

16. The electronic device according to claim 15, characterized in that: The electronic device further comprises a boost module, and one end of the battery is connected to one end of the first wireless charging conversion module through the boost module; The first control module is used to send a voltage boost signal to the boost module when the charging power boost signal is detected based on the first wireless charging conversion module; The boost module is used to keep the charging current unchanged and increase the charging voltage of the electronic device after detecting the voltage boost signal, so as to increase the charging power when transmitting electric energy to the receiving device.

17. The electronic device according to claim 16, characterized in that: The boost module includes a driving circuit and a voltage boost circuit, and the voltage boost circuit includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, a first capacitor and a second capacitor; Among them: one end of the first switch tube is connected to one end of the first wireless charging conversion module as the output end of the boost module, one end of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are respectively connected to one end of the drive circuit, the other end of the drive circuit is connected to one end of the first control module, the other end of the first switch tube is respectively connected to the other end of the second switch tube and one end of the first capacitor, another end of the second switch tube is respectively connected to the other end of the third switch tube and one end of the second capacitor, and is also connected to the battery as the input end of the boost module, another end of the third switch tube is respectively connected to the other end of the fourth switch tube and the other end of the first capacitor, and another end of the fourth switch tube and the other end of the second capacitor are commonly grounded.

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