WO2020169010A1 - Charging system and electronic device - Google Patents

Abstract

Provided are a charging system and electronic device. The charging system comprises a first electronic device (10) and a second electronic device (20). The first electronic device comprises a transmitting coil (101), and the second electronic device comprises a receiving coil (201). When the receiving coil (201) of the second electronic device (20) approaches the transmitting coil (101) of the first electronic device, the first electronic device (10) transmits electrical energy to the second electronic device (20). When the charging power at the time that the first electronic device (10) transmits electrical energy to the second electronic device (20) is less than a preset power threshold, the second electronic device (20) sends a charging power boost signal to the first electronic device (10). The first electronic device (10), upon receiving the charging power boost signal, changes the number of turns of the transmitting coil or increases the charging voltage, so as to increase the charging power at the time that the first electronic device (10) transmits electrical energy to the second electronic device (20). The charging system and electronic device improve the charging efficiency of wireless reverse charging, causing the user experience of reverse charging technology to be good, and the invention is highly practical.

Description

Charging system and electronic equipment

This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office of China, the application number is 201910135702.3, and the invention title is "charging system and electronic equipment" on February 23, 2019, the entire content of which is incorporated into this application by reference .

Technical field

The present invention relates to the field of electronic technology, in particular to a charging system and electronic equipment.

Background technique

With the continuous development of mobile Internet technology, user equipment (UE) such as mobile phones, tablet computers, or notebook computers has become one of the indispensable items in people's work and life. Thanks to the continuous improvement of the user experience of user equipment, wireless charging technology, which is different from traditional wired charging, has emerged. Because the wireless charging technology can make the charging process of the user equipment no longer need to consider the limitation of the data line, it is convenient for the user to use. Therefore, wireless charging technology has become one of the current research hotspots.

The current wireless charging technology mainly includes a forward charging mode and a reverse charging mode. For example, when user equipment A wirelessly charges user equipment B, user equipment A outputs wireless charging current to user equipment B, user equipment A is in reverse charging mode, and user equipment B is in forward charging mode. In the prior art, the charging power that can be provided by the user equipment in the reverse charging mode is relatively low, generally maintained at about 2.5W, which obviously cannot meet the charging requirements of the user equipment in the forward charging mode. This leads to low charging efficiency of the current wireless reverse charging technology and poor user experience.

Summary of the invention

The embodiment of the present invention provides a charging system and electronic equipment. By adopting the embodiment of the present invention, the charging efficiency of wireless reverse charging can be improved, so that the user experience of wireless reverse charging is good and the applicability is strong.

In the 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 power to the second electronic device. The second electronic device is configured to send a charging power increase 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 transfer of the first electronic device to the second electronic device The charging power when the device is transmitting power.

In the embodiment of the present invention, during the wireless reverse charging process of the first electronic device to the second electronic device, the first electronic device can boost its charge to the second electronic device in real time according to the power boost signal sent by the second electronic device. The charging power when transmitting electric energy, so that the second electronic device can obtain sufficient 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 users The experience is better.

In a feasible implementation manner, the above-mentioned 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.

In a feasible implementation manner, at least a first coil tap and a second coil tap are provided on the above-mentioned 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 above-mentioned 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 configured 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 , To increase the charging power of the second power supply. By reducing the number of coil turns, the charging power when the first electronic device transmits electric energy to the second electronic device is increased, and the method is simple and easy to implement.

In a feasible implementation manner, 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 configured 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 constant 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 .

In a feasible implementation manner, 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, a fourth switch tube, and a first capacitor. And the second capacitor. Here, one end of the first switch tube is used as the output end of the boost module to be connected to one end of the first wireless charging conversion 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 driving circuit. The other end of the driving 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. The other 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 terminal of the boost module. The other 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. The other end of the fourth switch tube and the other end of the second capacitor are commonly grounded. The boost circuit has a simple structure, is easy to implement, and can also reduce power loss.

In a feasible implementation manner, the second electronic device is further configured to transmit to the first charging device when it is detected that the charging power when the first electronic device transmits electric energy to the second electronic device is equal to a preset power threshold. Power hold signal. The first charging device is further configured to trigger the maintenance of the charging power when the first electronic device transmits electric energy to the second electronic device when the power holding signal is detected.

In a feasible implementation manner, the above-mentioned 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 to the second battery.

In the second aspect, embodiments of the present invention provide yet another 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 power to the second electronic device. The first electronic device is configured to change the number of turns of the transmitting coil when the preset power-up period arrives, or increase the charging voltage of the first electronic device, so as to increase the first electronic device to the second The charging power of an electronic device when it transmits electric energy. The second electronic device is configured to send a charging power maintaining 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 further configured to trigger the maintenance of the charging power level when the first electronic device transmits electric energy to the second electronic device when the charging power maintaining signal is received.

In the embodiment of the present invention, during the wireless reverse charging process of the first electronic device to the second electronic device, the first electronic device can periodically increase its charging power when transmitting electric energy to the second electronic device, so that the first electronic device Second, the electronic device can obtain sufficient charging power from the first electronic device faster, thereby improving the charging efficiency of the entire charging system, making the wireless reverse charging technology more applicable and better for user experience.

In a feasible implementation manner, the above-mentioned first electronic device includes a transmitting coil, a first wireless charging module, and a first battery. The first wireless charging module is used for converting the DC voltage provided by the first battery into an AC voltage, and transmitting the AC voltage to the transmitting coil. The transmitting coil is used for converting the AC voltage into electric energy, and transmitting the converted electric energy to the second electronic device.

In a feasible implementation manner, at least a first coil tap and a second coil tap are provided on the above-mentioned 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 above-mentioned 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 configured to transmit a coil turn reduction signal to the coil tap switching module when detecting the arrival of the power boost period. 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 , To increase the charging power of the second power supply.

In a feasible implementation manner, 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 configured to send a voltage boost signal to the boost module when detecting that the power boost period arrives. The boost module is used to keep the charging current constant and increase the charging voltage of the first electronic device after detecting the voltage increase signal, so as to increase the charging power when the first electronic device transmits electric energy to the second electronic device .

In a feasible implementation manner, 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, a fourth switch tube, and a first capacitor. And the second capacitor. Here, one end of the first switch tube is used as the output end of the boost module to be connected to one end of the first wireless charging conversion 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 driving circuit. The other end of the driving 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. The other 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 terminal of the boost module. The other 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 the other end of the fourth switch tube and the other end of the second capacitor are both grounded.

In a feasible implementation manner, the above-mentioned second electronic device further includes a receiving coil, a second wireless charging module, and a second battery. The receiving coil is used for receiving the electric energy transmitted by the transmitting coil, and converting 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 to the second battery.

In the third aspect, an embodiment of the present invention provides an electronic device. The above-mentioned electronic equipment includes 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 electric energy to the receiving device. The electronic device is further configured to change the number of turns of the transmitting coil after detecting the charging power increase signal sent by the receiving device, or increase the charging voltage of the electronic device, so as to increase the charging when transmitting electric energy to the receiving device power. Wherein, the power boost signal is sent when the receiving device detects that the charging power is less than a preset power threshold.

In a feasible implementation manner, the above electronic device further includes a first wireless charging module. The first wireless charging module is used for converting the DC voltage provided by the battery into an AC voltage, and the transmitting coil is used for converting the AC voltage into electric energy, and transmitting the converted electric energy to the receiving device.

In a feasible embodiment, the transmitting coil is provided with at least a first coil tap and a second coil tap, and 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 configured 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 , In order to increase the charging power when transmitting electric energy to the receiving device.

In a feasible implementation manner, 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 configured 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 boosting module is used to keep the charging current constant and boost the charging voltage of the electronic device after detecting the voltage boosting signal, so as to boost the charging power when transmitting electric energy to the receiving device.

In a feasible implementation manner, 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, a fourth switch tube, and a first capacitor. And the second capacitor. Here, one end of the first switch tube is used as the output end of the boost module to be connected to one end of the first wireless charging conversion 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 driving circuit. The other end of the driving 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. The other 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 at the same time as the input terminal of the boost module, is connected to the battery. The other 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. The other end of the fourth switch tube and the other end of the second capacitor are commonly grounded.

In a feasible implementation manner, the electronic device is also used to trigger the maintenance of the charging power when the electronic device transmits electric energy to the receiving device when the power holding signal is detected. Here, the power maintaining signal is sent when the receiving device detects that the charging power is equal to a preset power threshold.

In a fourth aspect, an embodiment of the present invention provides an electronic device. The electronic device may be the second electronic device provided in the first aspect or the 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 aspect or the second aspect, and can also implement the functional modules included in the second electronic device provided in the first aspect or the second aspect. Function. The electronic device may also include functional modules included in the receiving device provided in the foregoing third aspect, and can also implement the functions included in the functional modules included in the receiving device provided in the foregoing third aspect.

On the basis of the implementation manners provided in the above aspects, the present invention can be further combined to provide more implementation manners.

Description of the drawings

FIG. 1 is a schematic diagram of a structure of a charging system provided by an embodiment of the present invention;

2 is a schematic diagram of another structure of a charging system provided by an embodiment of the present invention;

3 is a schematic diagram of another structure of a charging system provided by an embodiment of the present invention;

4 is a schematic structural diagram of a first charging device provided by an embodiment of the present invention;

FIG. 5 is another schematic structural diagram of the first charging device provided by an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a boost module provided by an embodiment of the present invention.

detailed description

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

Please refer to FIG. 1, which is a schematic structural diagram of a wireless charging system according to 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 electric energy to the second electronic device 20. The second electronic device 20 can charge the second battery it contains based on the electric energy it receives. That is, in the wireless charging scenario shown in FIG. 1, the first electronic device 10 works in a wireless reverse charging mode, and the second electronic device 20 works in a wireless forward charging mode. It can be understood that, according to different specific scenarios, the first electronic device 10 may also work in the wireless forward charging mode, and the second electronic device 20 may also work in the wireless reverse charging mode. In this embodiment, a scenario where the first electronic device 10 works in the wireless reverse charging mode and the second electronic device 20 works in the 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 functions and wireless discharge functions, such as smart phones, tablet computers, in-vehicle devices, or smart wearable devices.

In practical applications, please refer to FIG. 2 together, which is another structural schematic diagram of the charging system provided by the embodiment of the present invention. As shown in FIG. 2, 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 that store electrical energy, which is not limited here. Before starting to transmit power to the second electronic device 20, the first electronic device 10 may periodically emit a detection signal, and the detection signal is used to detect whether there is a device that needs to be charged around the first electronic device 10. After the second electronic device 20 that needs to be charged is close to the first electronic device 10 (that is, the transmitting coil 101 and the receiving coil 201 are close to each other) and receiving the detection signal, the response signal corresponding to the detection signal can be transmitted. After the first electronic device 10 receives the response signal corresponding to the detection signal, it can determine that the second electronic device 20 needs to be charged, and then can realize 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 conversion processing such as power control, inversion, stabilization, and filtering on the direct current provided by the first battery 103 to Obtain a fixed power alternating current. 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 electric energy (that is, into an induced alternating current), and transmit the induced alternating current to the second wireless charging module 202. The second wireless charging module 202 can perform transformation processing such as power control, rectification, stabilization, and filtering on the induced AC power to obtain a fixed-power induced DC power, and use the induced DC power to charge the second battery 203 to realize electric energy transfer Transmission from an electronic device to a second electronic device. Here, it should be noted that the transmitting coil 101 can specifically transmit electric energy to the receiving coil 201 through electromagnetic induction, magnetic resonance transmission, etc., which is not limited here. For example, when the first wireless charging module 102 inputs an alternating current with a fixed power to 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 to realize electrical energy Of delivery. In the embodiment of the present invention, an electromagnetic induction type electric energy transmission method is taken as an example for description.

Further, please refer to FIG. 3 together. FIG. 3 is a schematic diagram of another structure of the charging system according to an embodiment of the present invention. As shown in FIG. 3, 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 (systerm-no-a-chip, SOC) with data processing capabilities. The first wireless charging conversion module 122 and the second wireless charging conversion module 222 may specifically be integrated wireless charging chips with functions such as inversion, rectification, and filtering, which are not limited here.

In a possible implementation manner, during the wireless charging process of the first electronic device 10 to the second electronic device 20, the second control module 221 can detect in real time when the first electronic device 10 transmits power to the second electronic device 20. The charging power. Specifically, the second control module 221 can detect the charging current and the 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 the charging voltage. Then, when the second control module 221 determines that the charging power when transmitting electric energy is less than the preset charging power threshold, it can send a power boost signal 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, it may send a first instruction to the second wireless charging conversion module 222, and the first instruction is used to instruct the second wireless charging The charging conversion module 222 generates alternating current with a specific frequency. After the second wireless charging conversion module 222 generates the alternating current, the alternating current can be input to 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 the transmitting coil 101 in the first electronic device 10 receives the radio signal T, it can convert it into a corresponding AC signal and transmit it to the first wireless charging conversion module 121. The first wireless charging conversion module 122 can convert the AC signal into the aforementioned power boost signal and transmit it to the first control module 121. After detecting the power increase signal, the first control module 121 can trigger the increase of the charging power when transmitting electric energy. Here, the first electronic device stepwise increases the charging power when the first electronic device transmits electric energy to the second electronic device 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 second The charging requirements of electronic devices ensure the smooth execution of wireless reverse charging, which can improve the stability of the entire charging system.

Optionally, the foregoing 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 aforementioned preset charging power threshold may specifically be the maximum input electric power allowed by the second battery.

Optionally, please refer to FIG. 4 together, which is a schematic structural diagram of the first electronic device according to an embodiment of the present invention. It can be seen from FIG. 4 that the transmitting coil 101 is provided with at least a first coil tap (such as tap 1) and a second coil tap (such as tap 2). 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. 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, a 3-coil tap is provided on the transmitting coil as an example for description. The first wireless charging module 102 also includes a coil tap switching module 123. The aforementioned coil tap switching module 123 includes a switch S1, a switch S2, and a switch S3. Here, the switch S1, the switch S2, and the switch S3 may be electronic switches or mechanical switches, which are not limited here. 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 taps 1 on the transmitting coil through switches S1, S2, and S3, respectively. Tap 2 and tap 3 are connected. It should be noted here that tap 1, tap 2, and tap 3 on the transmitting coil 101 are three different taps on the transmitting coil 101, corresponding to three different coil turns of the transmitting coil 101, respectively. Assume N1, N2, and N3 respectively, where N1<N2<N3. For example, assuming that the switch S1 is closed and the switch S2 and the switch S3 are in an open state, one end of the first wireless charging conversion module 122 is connected to the tap 1 through the switch S1. At this time, the number of turns of the transmitting coil is N1. Similarly, if one end of the first wireless charging conversion module 122 is connected to the aforementioned tap 2 through the switch S2, the number of turns of the transmitting coil 101 is N2, and if one end of the first wireless charging conversion module 122 is connected to the aforementioned tap 2 through the switch S3 The tap 3 is connected, and the number of turns of the transmitting coil 101 is 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 actual application scenarios, and are not limited to three, but can also be more. The embodiment of the present invention only takes the scenario of 3 taps and switches for illustration, and does not have a limiting effect.

The process of triggering and increasing the input electric power of the second battery 203 by the first electronic device 10 will be described below with reference to FIG. 4. When the first control module 121 detects the power boost signal, the first control module 121 may send an instruction to the first wireless charging conversion module 122 (the second instruction is used to replace the description below), and the second instruction is used to trigger the first The wireless charging conversion module 122 controls the switch S1, the switch S2, and the switch S3 to be turned on or off to reduce the coil 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 AC voltage on the transmitting coil 101 to the effective value U2 of the induced voltage on the receiving coil 201 is equal to the number of turns Nt of the transmitting coil 101 and the receiving coil The ratio of the number of turns Nr of 201, namely U1/U2=Nt/Nr. Specifically, assume that at the initial moment when the first electronic device is reversely charging the second electronic device, the switch S3 is turned on, 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 be turned off and the switch S2 to be turned on. In this way, the turns ratio of the transmitting coil 101 and the receiving coil 201 is changed from the original N3/N4 to N2/N4. And because N2<N3, this makes the value of U1/U2 smaller. The value of the effective value U1 of the voltage of the transmitting coil 101 has not changed, so the value of U2 will increase, that is, the effective value of the induced AC voltage in the receiving coil 201 will increase. This will further increase the power of the charging voltage converted by the second wireless charging conversion module 221, and finally increase the charging power when transmitting electric energy. Optionally, the difference between N1, N2, and N3 can be equal, so that the power difference of each increase of the charging power when transmitting electric energy can be the same, which can avoid the charging power when the electric energy is transmitted due to the excessive charging power of a single increase is too big.

In another possible implementation manner, please refer to FIG. 5 together. FIG. 5 is another schematic structural diagram of the first electronic device according to an embodiment of the present invention. It can be seen from FIG. 5 that the first wireless charging module 102 further includes a boosting 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 boosting module 124. The above-mentioned boosting module 124 is used to boost the DC voltage provided by the first battery. Under the condition that the current of the DC power remains unchanged, the transmission power of the transmitting coil 101 becomes larger, so that the induced AC in the receiving coil 201 The effective value of the voltage increases, which eventually increases the charging power when transmitting electric energy.

For specific implementation, please refer to FIG. 6 together. FIG. 6 is a schematic structural diagram of the boost module 124 according to an embodiment of the present invention. It can be seen from FIG. 6 that the boosting module 124 may include a driving circuit and a voltage boosting circuit. The voltage boosting circuit may include a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, and a fourth switching tube Q4. One end of the first switch tube Q1 serves as the voltage output end of the boost module 124 and is connected to one end of the first wireless charging conversion module 122 described above. One end of the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, and the fourth switching tube Q4 are respectively connected to one end of the driving circuit, and the other end of the driving 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 switching tube Q1 is used as the output terminal of the voltage boosting circuit to connect to one end of the first wireless charging conversion module 122, and the other end of the first switching tube Q1 is connected to one end of the second switching tube Q2 and the first capacitor C2. Connect at one end. The other end of the second switching tube Q2 is connected to one end of the third switching 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 boosting circuit. The other end of the third switch tube Q3 is respectively connected to one end of the fourth switch tube Q4 and the other end of the first capacitor C2. The other end of the fourth switch tube Q4 and the other end of the second capacitor C3 are simultaneously grounded.

The process in which the first electronic device 10 triggers to increase the input electric power of the second battery 203 will be described below with reference to the boost module 124 shown in FIG. 6. When the first control module 121 detects the above-mentioned power boost signal, it may send a driving control signal to the driving circuit to instruct the driving circuit to provide driving signals to the four switch tubes in the voltage boosting circuit. For example, after the above-mentioned driving circuit receives the above-mentioned driving control signal, it can drive the first switching tube Q1 and the third switching tube Q3 to turn on, and the second switching tube Q2 and the fourth switching tube Q4 are in the off state, and the energy storage capacitor C2 and C3 are in a charged state, and their capacitor voltage can eventually be equal to the input voltage of the voltage boosting circuit (that is, the output voltage of the charging power supply). Then, the driving circuit can drive the second switching tube Q2 and the fourth switching tube Q4 to turn on, and the third switching tube Q3 to be in the off state. At this time, C2 and C3 are in the discharging state, the output current of the voltage boosting circuit remains unchanged, and the output voltage is equal to The sum of the discharge voltages of the capacitor C2 and the capacitor C3, that is, the output voltage of the voltage boosting circuit is equal to twice the input voltage, achieving a double boost of the input voltage. When the output current is constant, the boosting 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. Under the condition that 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 made larger, and finally the charging power when transmitting electric energy is improved. Preferably, the above-mentioned switch tube may specifically be a field effect transistor (FET), a triode, etc., which is not limited this time. The use of the boosting module 124 to increase the charging power when transmitting electric energy has a simple circuit, is easy to implement, and can reduce electric energy loss.

It should be noted that the driving circuit and the voltage boosting circuit described in the embodiment of the present invention are only a feasible implementation manner of the boost module 124 and do not have a limiting effect. In actual applications, the boost module 124 may also be a boost chopper circuit, a switching boost converter, etc., which is not limited here.

Optionally, in practical applications, the above-mentioned boosting module 124 may also adopt a cascaded form of multiple voltage boosting circuits to realize boosting of different multiples. For example, the boost module 124 may include two voltage boost circuits, and the output terminal of the first voltage boost circuit is connected to the input terminal of the second voltage boost circuit. Under the coordinated drive of the driving circuit, 4 Times boost. In the same way, a 6-fold boost, an 8-fold boost, etc. can also be achieved by using multiple voltage boosting circuits in cascade connection, which is not limited here. The gain of the above boost module can be adjusted according to actual application scenarios. It can be understood that the use of cascaded voltage boost circuits can also increase the flexibility of the boost module. For example, suppose that the boost module 124 is formed by cascading two of the above-mentioned voltage boosting circuits. According to the difference of the driving signals, the boosting module 124 can achieve a double boost (for example, the gain of one voltage boosting circuit is controlled to 1, and the other voltage boosting The gain control of the circuit is 2), and 4 times boost can also be realized (for example, the gains of the two voltage boost circuits are both controlled to 2).

It should be noted that, in practical applications, after the first electronic device 10 receives a voltage increase signal sent by the second electronic device 20 and triggers the increase of the charging power when transmitting electric energy, if the second electronic device 20 determines to transmit electric energy If the charging power is still less than the 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 again triggers the boosting of the charging power when transmitting electric energy. Until the second electronic device 20 determines that the charging power when transmitting electric energy is equal to the 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 boosting of the second battery 203 input electric power. 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 during the transmission of electric energy from 5W to 5.5W through the two power boosting methods described above. After the power boost is achieved, the above-mentioned first control module 121 may continue to detect whether a new power boost signal is received. If the first electronic device 10 receives a new power increase signal again, it triggers the increase of the charging power when transmitting electric energy from 5.5W to 6W. It can be deduced by analogy until the second electronic device 20 determines that the charging power when transmitting electric energy is equal to the aforementioned preset charging power threshold. Here, the first electronic device stepwise increases the charging power when transmitting electric energy according to the power increase signal sent by the second electronic device, which can ensure the steady increase of the charging power when transmitting electric energy, so that the wireless reverse charging can be performed smoothly, and the whole The stability of the charging system.

Optionally, when the second electronic device 20 determines that the charging power when transmitting electrical energy is equal to the preset charging power threshold, it may also send a power hold signal to the first electronic device 10 to instruct the first electronic device 10 to stop triggering the boost The operation of charging power when transmitting electric energy, and maintaining the charging power when transmitting electric energy at the current moment.

In yet another feasible implementation manner, the first electronic device 10 can actively trigger to increase 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 during the transmission of electric energy is equal to the aforementioned preset power threshold. If the second control module 221 detects that the charging power when transmitting electric energy is equal to the aforementioned preset power threshold, it sends a power holding signal to the first electronic device 10, so that the first electronic device 10 stops triggering the increase of the charging power when transmitting electric energy. operating. Before detecting the power holding signal, the first control module 101 may periodically trigger an operation to increase the charging power when transmitting electric energy. Here, the specific process of increasing the input electric power can be referred to the process of increasing the charging power when transmitting electric energy by reducing the coil turns ratio and boosting the voltage by the boost module, which will not be repeated here. For example, before the power holding signal is detected, the first control module 101 mentioned above can trigger to increase the charging power when transmitting electric energy by a preset power difference when the preset power boost period arrives. Then when the next power-up period arrives, the power difference of the same magnitude is increased again, until the first control module 101 detects the power holding signal transmitted by the second electronic device 20, and stops the periodic increase of the charging power when transmitting electric energy. operating. Actively periodically increase the charging power when transmitting electric energy, so that the charging power when transmitting electric energy can be increased to the preset power threshold faster, avoiding the delay caused by stepwise increasing the charging power, and improving the charging system of the charging system. effectiveness.

In yet another feasible implementation manner, in a scenario where the first electronic device 10 actively triggers the increase of the input power of the second battery 203, the first electronic device 10 can indirectly detect whether to accept by detecting the transmission power of the transmitting coil 101 To the power holding signal fed back by the second electronic device 20, it is determined 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 transmitting 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 transmitting power of the transmitting coil 101 and the receiving power of the receiving coil 201 are proportional. In other words, the transmitting 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 transmitting 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 when transmitting electric energy does not reach the preset charging power threshold. Then the first electronic device 10 can continue to actively trigger to increase 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 transmitting power of the transmitting coil 101 is increased, it is detected whether the charging power during the transmission of electric energy reaches the preset charging power threshold, so as to determine whether to trigger the increase of the charging power during the transmission of electric energy, which can avoid the first electronic device 10 and the second electronic device. The adverse effects of the wireless communication failure between the devices 20 can improve the applicability of the charging system.

In yet another feasible implementation manner, the first electronic device 10 can also use the first control module 121 to detect in real time whether the transmission power of the transmitting coil 101 is Greater than or equal to the preset rated transmit power. Here, the rated transmitting power may be the maximum transmitting power of the transmitting coil 101 in a normal working state. If the first control module 121 detects that the transmitting power of the transmitting coil 101 is greater than or equal to the rated transmitting power, it can stop increasing the inverse charging input voltage, that is, not increasing the input voltage of the first wireless charging conversion module 122. At this time, if the first electronic device 10 receives a new power boost 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 transmitting coil 101. And the coil turns ratio of the receiving coil 201, so as to continue to increase the charging power when transmitting electric energy until it is equal to the preset charging power threshold. Through the effective combination of the two power boosting methods based on the boosting 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 suitable charging for the second battery 203. At the same time of power, the stability and safety of the entire charging system are also improved.

It should be noted that in the embodiment of the present invention, the first and second ones 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. In the same way, the first and second preceding the names of the first control module, the second control module, etc. do not have other limiting functions, and no examples are given here.

It should be noted that the embodiment of the present invention also provides an electronic device and a receiving device. The electronic device may be the aforementioned first electronic device 10, and the receiving device may be the aforementioned second electronic device 20. The electronic device can realize the functions of the aforementioned first electronic device, and the receiving device can realize the functions of the aforementioned second electronic device 20. The specific function implementation can be referred to the above, and will not be repeated here.

In the embodiment of the present invention, “first” and “second” are used to distinguish different objects or to distinguish different processing of the same object, rather than to describe a specific order of objects.

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 as examples, illustrations, or illustrations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present invention should not be construed as being more preferable or advantageous than other embodiments or design solutions. To be precise, words such as "exemplary" or "for example" are used to present related concepts in a specific manner.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. It should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (19)

1. A charging system, wherein 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 power to the second electronic device;

   The second electronic device is configured to send a charging power increase 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 to increase the first electronic device The charging power when transmitting electric energy to the second electronic device.
2. The charging system according to claim 1, wherein the first electronic device further comprises 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 voltage to the second electronic device. Of the electrical energy.
3. The charging system according to claim 2, wherein at least a first coil tap and a second coil tap are provided on the transmitting coil, and the number of coil turns corresponding to the first coil tap is less than that of the second coil The number of coil turns corresponding to the 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 configured 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 when the coil turn reduction signal is detected The second coil is tapped to increase the charging power of the second power source.
4. The charging system according to claim 2 or 3, wherein the first electronic device further comprises a boost module, and one end of the first battery passes through the boost module and the first wireless charging conversion module. Connect at one end;

   The first control module is configured to send a voltage increase signal to the boost module when the charging power increase signal is detected based on the first wireless charging conversion module;

   The boosting module is used to keep the charging current constant and boost the charging voltage of the first electronic device after detecting the voltage boost signal, so as to boost the transmission of the first electronic device to the second electronic device The charging power when electric energy.
5. The charging system according to claim 4, wherein 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 second switch tube. Four switch tubes, the first capacitor and the second capacitor;

   Wherein: one end of the first switch tube is used as the output end of the boost module to connect with one end of the first wireless charging conversion module, and the first switch tube, the second switch tube, and the first switch tube One end of 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, and the other end of the first switch tube One end is connected to the other end of the second switch tube and one end of the first capacitor, and the other end of the second switch tube is connected to the other end of the third switch tube and the second capacitor. One end is connected, and at the same time as the input end of the boost module, is connected to the first battery, and the other end of the third switch tube is connected to the other end of the fourth switch tube and the first capacitor. The other end of the fourth switch tube and the other end of the second capacitor are connected to the ground.
6. The charging system according to any one of claims 1 to 5, wherein the second electronic device is further configured to detect that the charging power when the first electronic device transmits electric energy to the second electronic device is equal to When the power threshold is preset, transmit a power holding signal to the first charging device;

   The first charging device is also used to trigger the maintenance of the charging power level when the first electronic device transmits electric energy to the second electronic device when the power holding signal is detected.
7. The charging system according to any one of claims 1-6, wherein the second electronic device comprises 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 to the second battery.
8. A charging system, wherein 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 power to the second electronic device;

   The first electronic device is configured to change the number of turns of the transmitting coil when a preset power-up period is reached, or increase the charging voltage of the first electronic device to increase the first electronic device Charging power when transmitting electric energy to the second electronic device;

   The second electronic device is configured to send a charging power maintaining 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 further configured to trigger the maintenance of the charging power level when the first electronic device transmits electric energy to the second electronic device when the charging power maintaining signal is received.
9. The charging system according to claim 8, wherein the first electronic device comprises a transmitting coil, a first wireless charging module and a first battery;

   The first wireless charging module is configured 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.
10. The charging system according to claim 9, wherein the transmitter coil is provided with at least a first coil tap and a second coil tap, and the number of coil turns corresponding to the first coil tap is less than that of the second coil The number of coil turns corresponding to the 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 configured to transmit a coil turn reduction signal to the coil tap switching module when detecting that the power boost period arrives;

    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 when the coil turn reduction signal is detected The second coil is tapped to increase the charging power of the second power source.
11. The charging system according to claim 9 or 10, wherein the first electronic device further comprises a boost module, and one end of the first battery passes through the boost module and the first wireless charging conversion module. Connect at one end;

    The first control module is configured to send a voltage boost signal to the boost module when detecting that the power boost period arrives;

    The boosting module is used to keep the charging current constant and boost the charging voltage of the first electronic device after detecting the voltage boost signal, so as to boost the transmission of the first electronic device to the second electronic device The charging power when electric energy.
12. The charging system according to claim 11, wherein 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 second switch tube. Four switch tubes, the first capacitor and the second capacitor;

    Wherein: one end of the first switch tube is used as the output end of the boost module to connect with one end of the first wireless charging conversion module, and the first switch tube, the second switch tube, and the first switch tube One end of 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, and the other end of the first switch tube One end is connected to the other end of the second switch tube and one end of the first capacitor, and the other end of the second switch tube is connected to the other end of the third switch tube and the second capacitor. One end is connected, and at the same time as the input end of the boost module, is connected to the first battery, and the other end of the third switch tube is connected to the other end of the fourth switch tube and the first capacitor. The other end of the fourth switch tube and the other end of the second capacitor are connected to the ground.
13. The charging system according to any one of claims 9-12, wherein the second electronic device further comprises 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 to the second battery.
14. An electronic device, characterized in that the electronic device includes 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 electrical energy to the receiving device;

    The electronic device is further configured to change the number of turns of the transmitting coil after detecting the charging power increase signal sent by the receiving device, or increase the charging voltage of the electronic device to increase the power supply to the receiving device The charging power when transmitting electric energy, wherein the power boost signal is sent when the receiving device detects that the charging power is less than a preset power threshold.
15. The electronic device according to claim 14, wherein the electronic device further comprises 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 .
16. The electronic device according to claim 15, wherein at least a first coil tap and a second coil tap are provided on the transmitting coil, and the number of coil turns corresponding to the first coil tap is less than that of the second coil The number of coil turns corresponding to the 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 configured 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 when the coil turn reduction signal is detected The second coil is tapped to increase the charging power when transmitting electric energy to the receiving device.
17. The electronic device according to claim 15 or 16, wherein 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 configured to send a voltage increase signal to the boost module when the charging power increase signal is detected based on the first wireless charging conversion module;

    The boosting module is used to keep the charging current constant and increase the charging voltage of the electronic device after detecting the voltage increase signal, so as to increase the charging power when transmitting electric energy to the receiving device.
18. The electronic device according to claim 17, wherein 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 second switch tube. Four switch tubes, the first capacitor and the second capacitor;

    Wherein: one end of the first switch tube is used as the output end of the boost module to connect with one end of the first wireless charging conversion module, and the first switch tube, the second switch tube, and the first switch tube One end of 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, and the other end of the first switch tube One end is connected to the other end of the second switch tube and one end of the first capacitor, and the other end of the second switch tube is connected to the other end of the third switch tube and the second capacitor. One end is connected, and at the same time as the input end of the boost module, is connected to the battery, and the other end of the third switch tube is connected to the other end of the fourth switch tube and the other end of the first capacitor. One end is connected, and the other end of the fourth switch tube and the other end of the second capacitor are commonly grounded.
19. The electronic device according to any one of claims 14-18, wherein the electronic device is further configured to trigger the maintenance of the charging when the electronic device transmits power to the receiving device when a power holding signal is detected. The power level is unchanged, wherein the power holding signal is sent when the receiving device detects that the charging power is equal to a preset power threshold.

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