Charging system and method

Abstract

The invention is suitable for the technical field of wireless charging, and provides a charging system and method. The charging system comprises a charging device and a to-be-charged device. The charging device comprises a first control module, a voltage adjusting module and a transmitting module. The to-be-charged device comprises a receiving module, a second control module, a rectification module, a charging module, a first acquisition module and a second acquisition module. The first acquisition module acquires the output voltage of the charging module; the second acquisition module acquires the output voltage of the rectifier module; the second control module outputs a first instruction according to the output voltage of the charging module and the output voltage of the rectification module; the first control module outputs a first control signal to the voltage adjusting module according to the first instruction; the voltage adjusting module adjusts the output voltage according to the first control signal so as to adjust the transmitting power of the transmitting module and enable the output voltage of the rectification module to be the target voltage. The problem that a traditional NFC charging system is high in energy loss is solved.

Description

Technical Field

[0001] The present application belongs to the field of wireless charging technology, and in particular, relates to a charging system and method. Background Art

[0002] At present, traditional wireless charging methods are divided into: electromagnetic induction wireless charging, magnetic resonance wireless charging, wireless charging based on radio waves, NFC (Near Field Communication) charging, etc. In the NFC charging system, the output voltage of the rectifier module is a fixed voltage, and its rear end is connected to the charging module, which is used to charge the battery in the device to be charged. Since there is a voltage drop between the output voltage of the charging module and the output voltage of the rectifier module, when the charging current is constant, the greater the voltage drop, the higher the energy loss of the charging module, which in turn affects the energy conversion efficiency of the entire charging system.

[0003] Therefore, the traditional NFC charging system has the problem of high energy loss. Summary of the invention

[0004] The embodiments of the present application provide a charging system and method, which can solve the problem of high energy loss in traditional NFC charging systems.

[0005] In a first aspect, an embodiment of the present application provides a charging system, including a charging device and a device to be charged; the charging device includes a first control module, a voltage adjustment module and a transmitting module, the first control module is electrically connected to the voltage adjustment module and the transmitting module respectively, and the voltage adjustment module is electrically connected to the transmitting module; the device to be charged includes a receiving module, a second control module, a rectifier module, a charging module, a first acquisition module and a second acquisition module, the second control module is electrically connected to the receiving module, the first acquisition module and the second acquisition module respectively, the rectifier module is electrically connected to the receiving module, the charging module and the second acquisition module respectively, and the charging module is electrically connected to a battery and the first acquisition module respectively;

[0006] The first acquisition module is used to acquire the output voltage of the charging module;

[0007] The second acquisition module is used to collect the output voltage of the rectifier module;

[0008] The second control module is used to output a first instruction according to the output voltage of the charging module and the output voltage of the rectifier module, and transmit the first instruction to the first control module through the receiving module and the transmitting module;

[0009] The first control module is used to output a first control signal to the voltage adjustment module according to the first instruction;

[0010] The voltage adjustment module is used to adjust its output voltage according to the first control signal to adjust the transmission power of the transmission module so that the output voltage of the rectifier module is a target voltage; wherein the target voltage is the sum of the output voltage of the charging module and a preset voltage.

[0011] In a possible implementation of the first aspect, the voltage adjustment module includes a DC / DC conversion unit and a voltage adjustment unit; the voltage adjustment unit is electrically connected to the DC / DC conversion unit, the first control module and the transmitting module respectively, and the DC / DC conversion unit is electrically connected to the first control module and a power supply respectively;

[0012] The first control module is used to output an enable signal to the DC / DC conversion unit;

[0013] The DC / DC conversion unit is used to convert the voltage provided by the power supply according to the enable signal;

[0014] The voltage adjustment unit is used to output a feedback voltage to the DC / DC conversion unit according to the first control signal, so that the DC / DC conversion unit adjusts its output voltage according to the feedback voltage.

[0015] In a possible implementation manner of the first aspect, the voltage adjustment unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a switch tube and a first capacitor; the first end of the first resistor is electrically connected to the first end of the fifth resistor, the DC / DC conversion unit and the transmitting module respectively, the second end of the first resistor is electrically connected to the DC / DC conversion unit, the first end of the second resistor and the first end of the third resistor respectively, the second end of the third resistor is electrically connected to the first end of the first capacitor and the first end of the fourth resistor respectively, the second end of the fourth resistor is electrically connected to the second end of the fifth resistor and the first conduction end of the switch tube respectively, the control end of the switch tube is electrically connected to the first control module, and the second conduction end of the switch tube, the second end of the second resistor and the second end of the first capacitor are all grounded.

[0016] In a possible implementation of the first aspect, the DC / DC conversion unit includes a DC / DC conversion chip, a second capacitor, a third capacitor and a first inductor; the power supply pin of the DC / DC conversion chip is electrically connected to the first end of the third capacitor and the power supply, respectively, the enable pin of the DC / DC conversion chip is electrically connected to the first control module, the feedback pin of the DC / DC conversion chip is electrically connected to the voltage adjustment unit, the output pin of the DC / DC conversion chip is electrically connected to the first end of the first inductor, the second end of the first inductor is electrically connected to the first end of the second capacitor, the voltage adjustment unit and the transmitting module, respectively, and the second end of the second capacitor, the second end of the third capacitor and the ground pin of the DC / DC conversion chip are all grounded.

[0017] In a possible implementation of the first aspect, the first acquisition module includes a sixth resistor, a seventh resistor, an eighth resistor and a fourth capacitor; the first end of the sixth resistor is electrically connected to the positive electrode of the battery and the charging module, respectively, the second end of the sixth resistor is electrically connected to the first end of the seventh resistor and the first end of the eighth resistor, respectively, the second end of the seventh resistor is electrically connected to the first end of the fourth capacitor and the second control module, and the second end of the eighth resistor and the second end of the fourth capacitor are both grounded.

[0018] In a possible implementation of the first aspect, the second acquisition module includes a ninth resistor, a tenth resistor, an eleventh resistor and a fifth capacitor; the first end of the ninth resistor is electrically connected to the rectifier module and the charging module, respectively, the second end of the ninth resistor is electrically connected to the first end of the tenth resistor and the first end of the eleventh resistor, respectively, the second end of the eleventh resistor is electrically connected to the first end of the fifth capacitor and the second control module, and the second end of the tenth resistor and the second end of the fifth capacitor are both grounded.

[0019] In a possible implementation manner of the first aspect, the charging device further includes a third acquisition module, and the third acquisition module is electrically connected to the voltage adjustment module, the transmitting module, and the first control module respectively;

[0020] The third acquisition module is used to acquire the output voltage of the voltage adjustment module;

[0021] The first control module is used to monitor the transmission power of the transmission module according to the output voltage of the voltage adjustment module.

[0022] In a possible implementation of the first aspect, the third acquisition module includes a twelfth resistor, a thirteenth resistor, a fourteenth resistor and a sixth capacitor; the first end of the twelfth resistor is electrically connected to the voltage adjustment module and the transmitting module, respectively, the second end of the twelfth resistor is electrically connected to the first end of the thirteenth resistor and the first end of the fourteenth resistor, respectively, the second end of the fourteenth resistor is electrically connected to the first end of the sixth capacitor and the first control module, and the second end of the thirteenth resistor and the second end of the sixth capacitor are both grounded.

[0023] In a second aspect, an embodiment of the present application provides a charging method, which is applied to a device to be charged, comprising:

[0024] Obtain the output voltage of the charging module and the output voltage of the rectifier module;

[0025] A first instruction is output according to the output voltage of the charging module and the output voltage of the rectifier module; the first instruction is used to instruct the charging device to adjust the transmission power of the transmission module so that the output voltage of the rectifier module is a target voltage; wherein the target voltage is the sum of the output voltage of the charging module and a preset voltage.

[0026] In a possible implementation manner of the second aspect, outputting a first instruction according to an output voltage of the charging module and an output voltage of the rectifier module includes:

[0027] Determining the target voltage according to the output voltage of the charging module;

[0028] The first instruction is output according to the target voltage and the output voltage of the rectifier module.

[0029] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0030] The embodiment of the present application provides a charging system, including a charging device and a device to be charged. The charging device includes a first control module, a voltage adjustment module and a transmitting module; the first control module is electrically connected to the voltage adjustment module and the transmitting module respectively, and the voltage adjustment module is electrically connected to the transmitting module. The device to be charged includes a receiving module, a second control module, a rectifier module, a charging module, a first acquisition module and a second acquisition module; the second control module is electrically connected to the receiving module, the first acquisition module and the second acquisition module respectively, the rectifier module is electrically connected to the receiving module, the charging module and the second acquisition module respectively, and the charging module is electrically connected to the battery and the first acquisition module respectively.

[0031] The first acquisition module is used to acquire the output voltage of the charging module; the second acquisition module is used to acquire the output voltage of the rectifier module; the second control module is used to output a first instruction according to the output voltage of the charging module and the output voltage of the rectifier module, and transmit the first instruction to the first control module through the receiving module and the transmitting module; the first control module is used to output a first control signal to the voltage adjustment module according to the first instruction; the voltage adjustment module is used to adjust its output voltage according to the first control signal to adjust the transmission power of the transmitting module so that the output voltage of the rectifier module is the target voltage; wherein the target voltage is the sum of the output voltage of the charging module and the preset voltage.

[0032] From the above, it can be seen that the charging system provided in the embodiment of the present application dynamically adjusts the transmission power of the transmitting module according to the output voltage of the charging module, so that the output voltage of the rectifier module is the target voltage, so that the voltage drop between the output voltage of the charging module and the output voltage of the rectifier module is always a preset voltage. Since the voltage value of the preset voltage is very small, the energy loss of the charging module is greatly reduced, and the energy conversion efficiency of the entire charging system is improved.

[0033] In summary, the charging system provided in the embodiments of the present application solves the problem of high energy loss in the traditional NFC charging system.

[0034] It can be understood that the beneficial effects of the second aspect mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0036] Figure 1 is a principle block diagram of a charging system provided by an embodiment of the present application;

[0037] Figure 2 is a principle block diagram of a charging system provided by another embodiment of the present application;

[0038] Figure 3 This is a circuit connection diagram of a charging device in a charging system provided by an embodiment of the present application;

[0039] Figure 4 This is a circuit connection diagram of a device to be charged in a charging system provided by an embodiment of the present application;

[0040] Figure 5It is a flow chart of a charging method provided in one embodiment of the present application.

[0041] In the figure: 10, charging device; 11, first control module; 12, voltage adjustment module; 121, DC / DC conversion unit; 122, voltage adjustment unit; 13, transmitting module; 131, transmitting unit; 132, first matching unit; 133, transmitting coil; 14, third acquisition module; 15, power supply; 20, device to be charged; 21, receiving module; 211, receiving unit; 212, second matching unit; 213, receiving coil; 22, second control module; 23, rectifier module; 24, charging module; 25, first acquisition module; 26, second acquisition module; 27, battery. DETAILED DESCRIPTION

[0042] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0043] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0044] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0045] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0046] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0047] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0048] In the traditional NFC charging system, the output voltage of the rectifier module is a fixed voltage, generally 5V, and its back end is connected to the charging module, which is used to charge the battery in the device to be charged. If the output voltage of the charging module is 3.7V, then the voltage drop between the output voltage of the charging module and the output voltage of the rectifier module is 1.3V. Under a certain charging current, the charging module will produce energy loss. The greater the voltage drop, the higher the energy loss of the charging module, which in turn affects the energy conversion efficiency of the entire charging system.

[0049] In view of the above problems, the present application provides a charging system, such as Figure 1 As shown, the charging system includes a charging device 10 and a device to be charged 20. The charging device 10 is used to wirelessly charge the device to be charged 20.

[0050] The charging device 10 includes a first control module 11 , a voltage adjustment module 12 and a transmitting module 13 . The first control module 11 is electrically connected to the voltage adjustment module 12 and the transmitting module 13 , respectively. The voltage adjustment module 12 is electrically connected to the transmitting module 13 .

[0051] The device to be charged 20 includes a receiving module 21, a second control module 22, a rectifier module 23, a charging module 24, a first acquisition module 25 and a second acquisition module 26. The second control module 22 is electrically connected to the receiving module 21, the first acquisition module 25 and the second acquisition module 26 respectively, the rectifier module 23 is electrically connected to the receiving module 21, the charging module 24 and the second acquisition module 26 respectively, and the charging module 24 is electrically connected to the battery 27 and the first acquisition module 25 respectively.

[0052] Among them, the transmitting module 13 is used to realize the mutual conversion of electrical energy and magnetic energy, and is also used to demodulate and decode the information sent by the receiving module 21 and transmit it to the first control module 11, and at the same time encode and adjust the information output by the first control module 11 and send it to the receiving module 21.

[0053] The receiving module 21 is used to realize the mutual conversion between electric energy and magnetic energy, and is also used to demodulate and decode the information sent by the transmitting module 13 and transmit it to the second control module 22, and at the same time, encode and adjust the information output by the second control module 22 and send it to the transmitting module 13. Both the transmitting module 13 and the receiving module 21 have the functions of transmitting and receiving.

[0054] The rectifier module 23 is used to convert the AC voltage output by the receiving module 21 into a DC voltage and filter the DC voltage to keep the output DC voltage stable.

[0055] The charging module 24 is used to charge the battery 27 according to the DC voltage output by the rectifying module 23 .

[0056] The first acquisition module 25 is used to acquire the output voltage of the charging module 24 .

[0057] The second acquisition module 26 is used to acquire the output voltage of the rectifier module 23 .

[0058] Specifically, when the charging device 10 and the device to be charged 20 just start to establish communication, the charging device 10 adjusts the transmission power of the transmitting module 13 to the maximum, that is, adjusts the output voltage of the voltage adjustment module 12 to the maximum, and sends a power query instruction to the device to be charged 20. After receiving the magnetic energy sent by the transmitting module 13, the receiving module 21 in the device to be charged 20 is automatically activated, and at the same time demodulates and decodes the communication instruction, and outputs the power query instruction to the second control module 22. At this time, the output voltage of the rectifier module 23 is the maximum. The second control module 22 obtains the output voltage of the charging module 24 according to the power query instruction. When the output voltage of the charging module 24 is greater than the output voltage of the voltage adjustment module 12, the charging prohibition instruction is sent to the transmitting module 13 through the receiving module 21.

[0059] When the output voltage of the charging module 24 is less than the output voltage of the voltage adjustment module 12, the charging module 24 is allowed to charge the battery 27, and the target voltage is determined according to the output voltage of the charging module 24, and the charging permission command, the expected voltage value and the output voltage reduction instruction are sent to the transmitting module 13 through the receiving module 21. Among them, the target voltage is the minimum voltage that satisfies the normal operation of the charging module 24, specifically the sum of the output voltage of the charging module 24 and the preset voltage, which is caused by the internal circuit of the charging module 24 and is generally 200mV or 300mV.

[0060] After receiving the charging permission instruction, the expected voltage value and the output voltage reduction instruction, the first control module 11 queries the output voltage of the voltage adjustment module 12 corresponding to the expected voltage value through a table lookup method, and then adjusts the output voltage of the voltage adjustment module 12, thereby adjusting the transmission power of the transmission module 13, so that the output voltage of the rectifier module 23 is the target voltage.

[0061] When the first control module 11 does not store a table corresponding to the expected voltage value and the output voltage of the voltage adjustment module 12, the first control module 11 can adjust the output voltage of the voltage adjustment module 12 according to the instruction to reduce the output voltage, thereby adjusting the transmission power of the transmitting module 13 so that the output voltage of the rectifier module 23 is the target voltage. At this time, the communication establishment is completed and the normal charging stage is entered.

[0062] After entering the normal charging stage, the second control module 22 outputs a first instruction according to the output voltage of the charging module 24 and the output voltage of the rectifier module 23, and transmits the first instruction to the first control module 11 through the receiving module 21 and the transmitting module 13. The specific process of the second control module 22 outputting the first instruction according to the output voltage of the charging module 24 and the output voltage of the rectifier module 23 is as follows: the second control module 22 determines the target voltage according to the output voltage of the charging module 24, and outputs the first instruction according to the target voltage and the output voltage of the rectifier module 23. The specific process of outputting the first instruction according to the target voltage and the output voltage of the rectifier module 23 is as follows: when the output voltage of the rectifier module 23 is less than the target voltage, the first instruction is output.

[0063] Since the output voltage of the charging module 24 is equal to the voltage of the battery 27, when the voltage of the battery 27 gradually increases with the increase of charging time, the output voltage of the charging module 24 will also gradually increase, and the target voltage determined according to the output voltage of the charging module 24 will also gradually increase. During the communication establishment process between the charging device 10 and the device to be charged 20, the output voltage of the rectifier module 23 has been adjusted to the target voltage, but as the charging time increases, the target voltage will increase. If the output voltage of the rectifier module 23 is not adjusted, the output voltage of the rectifier module 23 will be lower than the target voltage, so the first instruction output includes the expected voltage value and the instruction to increase the output voltage.

[0064] After receiving the first instruction, the first control module 11 outputs a first control signal to the voltage adjustment module 12 according to the first instruction. The voltage adjustment module 12 adjusts its output voltage according to the first control signal to adjust the transmission power of the transmission module 13 so that the output voltage of the rectifier module 23 is the target voltage. The dynamic adjustment process is maintained until the charging is completed. It should be noted that the first control module 11 can directly query the output voltage of the voltage adjustment module 12 corresponding to the expected voltage value through a table lookup method and output the first control signal; when the first control module 11 does not store a table corresponding to the expected voltage value and the output voltage of the voltage adjustment module 12, the first control module 11 can output the first control signal according to the instruction to increase the output voltage.

[0065] From the above, it can be seen that the charging system provided in the embodiment of the present application dynamically adjusts the transmission power of the transmitting module 13 according to the output voltage of the charging module 24, so that the output voltage of the rectifier module 23 is the target voltage, so that the voltage drop between the output voltage of the charging module 24 and the output voltage of the rectifier module 23 is always a preset voltage. Since the voltage value of the preset voltage is very small, the energy loss of the charging module 24 is greatly reduced, and the energy conversion efficiency of the entire charging system is improved.

[0066] In summary, the charging system provided in the embodiments of the present application solves the problem of high energy loss in the traditional NFC charging system.

[0067] Exemplarily, the device to be charged 20 is a wearable device, specifically a wearable device such as headphones, glasses, and a sports bracelet.

[0068] Exemplarily, the rectifier module 23 includes a rectifier unit and a filter unit. The rectifier unit is an H-bridge full-wave rectifier unit composed of Schottky diodes or a synchronous rectifier unit composed of MOS tubes, and the filter unit includes a filter capacitor.

[0069] Exemplarily, the charging module 24 is a linear charging module.

[0070] like Figure 2 As shown, the voltage adjustment module 12 includes a DC / DC conversion unit 121 and a voltage adjustment unit 122. The voltage adjustment unit 122 is electrically connected to the DC / DC conversion unit 121, the first control module 11 and the transmitting module 13 respectively, and the DC / DC conversion unit 121 is electrically connected to the first control module 11 and the power supply 15 respectively.

[0071] Specifically, the first control module 11 is used to output an enable signal to the DC / DC conversion unit 121. The DC / DC conversion unit 121 is used to convert the voltage provided by the power supply 15 according to the enable signal. The voltage adjustment unit 122 is used to output a feedback voltage to the DC / DC conversion unit 121 according to the first control signal, so that the DC / DC conversion unit 121 adjusts its output voltage according to the feedback voltage.

[0072] like Figure 3As shown, the voltage adjustment unit 122 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a switch tube Q1 and a first capacitor C1. The first end of the first resistor R1 is electrically connected to the first end of the fifth resistor R5, the DC / DC conversion unit 121 and the transmitting module 13, respectively; the second end of the first resistor R1 is electrically connected to the DC / DC conversion unit 121, the first end of the second resistor R2 and the first end of the third resistor R3, respectively; the second end of the third resistor RR3 is electrically connected to the first end of the first capacitor C1 and the first end of the fourth resistor R4, respectively; the second end of the fourth resistor R4 is electrically connected to the second end of the fifth resistor R5 and the first conduction end of the switch tube Q1, respectively; the control end of the switch tube Q1 is electrically connected to the first control module 11, and the second conduction end of the switch tube Q1, the second end of the second resistor R2 and the second end of the first capacitor C1 are all grounded.

[0073] Specifically, assuming that the feedback voltage output by the voltage adjustment unit 122 is represented by VFB, and the output voltage of the DC / DC conversion unit 121 is represented by VOUT, then VOUT = VFB (1 + R 1d / R 2d ), where R 1d is the equivalent resistance of the first resistor R1, R 2d is the equivalent resistance of the second resistor R2.

[0074] When the switch Q1 is turned off, R 2d is the resistance of the second resistor R2, R 1d is the resistance value of the first resistor R1 plus (the resistance value of the fifth resistor R5, the resistance value of the third resistor R3 and the resistance value of the fourth resistor R4). 1d is the minimum value, therefore, when the switch tube Q1 is turned off, VOUT is minimum.

[0075] When the switch Q1 is turned on, R 1d is the resistance value of the first resistor R1, R 2d is the resistance value of the second resistor R2 plus the resistance value of the third resistor R3 and the resistance value of the fourth resistor R4. 2d is the minimum value, therefore, when the switch tube Q1 is turned on, VOUT is the maximum.

[0076] The first control module 11 adjusts the feedback voltage output by the voltage adjustment unit 122 by adjusting the duty cycle of the switch tube Q1, and then adjusts the output voltage of the DC / DC conversion unit 121 to adjust the transmission power of the transmission module 13 so that the output voltage of the rectifier module 23 is the target voltage. The first capacitor C1 plays a filtering role.

[0077] Exemplarily, the switch tube Q1 is an NMOS (n-metal-oxide-semiconductor) tube, the control end of the switch tube Q1 is the gate of the NMOS tube, the first conduction end of the switch tube Q1 is the drain of the NMOS tube, and the second conduction end of the switch tube Q1 is the source of the NMOS tube.

[0078] It should be noted that the voltage adjustment unit 122 may also be replaced by other units that realize its functions, and is not limited thereto.

[0079] like Figure 3 As shown, the DC / DC conversion unit 121 includes a DC / DC conversion chip, a second capacitor C2, a third capacitor C3 and a first inductor L1. The power supply pin of the DC / DC conversion chip is electrically connected to the first end of the third capacitor C3 and the power supply 15 respectively, the enable pin of the DC / DC conversion chip is electrically connected to the first control module 11, the feedback pin of the DC / DC conversion chip is electrically connected to the voltage adjustment unit 122, the output pin of the DC / DC conversion chip is electrically connected to the first end of the first inductor L1, the second end of the first inductor L1 is electrically connected to the first end of the second capacitor C2, the voltage adjustment unit 122 and the transmitting module 13 respectively, and the second end of the second capacitor C2, the second end of the third capacitor C3 and the ground pin of the DC / DC conversion chip are all grounded. According to Figure 3 It can be seen that the feedback pin of the DC / DC conversion chip is electrically connected to the second end of the first resistor R1, the first end of the second resistor R2 and the first end of the third resistor R3 respectively. The second end of the first inductor L1 is electrically connected to the first end of the second capacitor C2, the first end of the first resistor R1, the first end of the fifth resistor R5 and the transmitting module 13 respectively.

[0080] Specifically, the DC / DC conversion chip converts the voltage provided by the power supply 15 under the action of the enable signal. The output voltage of the DC / DC conversion chip is adjusted by adjusting the feedback voltage output by the voltage adjustment unit 122 to adjust the transmission power of the transmission module 13. Among them, the second capacitor C2 and the third capacitor C3 play a filtering role. The first inductor L1 is used to store electrical energy and stabilize the output voltage.

[0081] like Figure 2 As shown, the transmitting module 13 includes a transmitting unit 131, a first matching unit 132 and a transmitting coil 133. The transmitting unit 131 is electrically connected to the voltage adjustment module 12, the first control module 11 and the first matching unit 132 respectively, and the first matching unit 132 is electrically connected to the transmitting coil 133. Figure 3 As shown, the transmitting coil 133 includes a coil L2.

[0082] Specifically, the first matching unit 132 and the transmitting coil 133 form a transmitting antenna for realizing mutual conversion between electric energy and magnetic energy. The first matching unit 132 is used to match the size of the transmitting antenna, including inductance and capacitance.

[0083] The transmitting unit 131 is used to demodulate and decode the information sent by the receiving module 21 and transmit it to the first control module 11, and at the same time encode and adjust the information output by the first control module 11 and send it to the receiving module 21 through the transmitting antenna.

[0084] like Figure 2 As shown, the receiving module 21 includes a receiving unit 211, a second matching unit 212 and a receiving coil 213. The receiving unit 211 is electrically connected to the second control module 22 and the second matching unit 212 respectively, and the second matching unit 212 is electrically connected to the rectifier module 23 and the receiving coil 213 respectively. Figure 4 As shown, the receiving coil 213 includes a coil L3.

[0085] Specifically, the second matching unit 212 and the receiving coil 213 form a receiving antenna for realizing the mutual conversion between electric energy and magnetic energy. The second matching unit 212 is used to match the size of the receiving antenna, including inductance and capacitance.

[0086] The receiving unit 211 is used to demodulate and decode the information sent by the transmitting module 13 and transmit it to the second control module 22, and at the same time encode and adjust the information output by the second control module 22 and send it to the transmitting module 13 through the receiving antenna.

[0087] like Figure 4 As shown, the first acquisition module 25 includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a fourth capacitor C4. The first end of the sixth resistor R6 is electrically connected to the positive electrode of the battery 27 and the charging module 24 respectively, the second end of the sixth resistor R6 is electrically connected to the first end of the seventh resistor R7 and the first end of the eighth resistor R8 respectively, the second end of the seventh resistor R7 is electrically connected to the first end of the fourth capacitor C4 and the second control module 22 respectively, and the second end of the eighth resistor R8 and the second end of the fourth capacitor C4 are both grounded.

[0088] Specifically, the first acquisition module 25 acquires the output voltage of the charging module 24 by means of resistor voltage division, and transmits it to the second control module 22 after filtering. The sixth resistor R6 and the eighth resistor R8 form a voltage division circuit, and the seventh resistor R7 and the fourth capacitor C4 form a filtering circuit.

[0089] It should be noted that the first acquisition module 25 may also be replaced by other units that realize its functions, and is not limited thereto.

[0090] like Figure 4As shown, the second acquisition module 26 includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11 and a fifth capacitor C5. The first end of the ninth resistor R9 is electrically connected to the rectifier module 23 and the charging module 24 respectively, the second end of the ninth resistor R9 is electrically connected to the first end of the tenth resistor R10 and the first end of the eleventh resistor R11 respectively, the second end of the eleventh resistor R11 is electrically connected to the first end of the fifth capacitor C5 and the second control module 22 respectively, and the second end of the tenth resistor R10 and the second end of the fifth capacitor C5 are both grounded.

[0091] Specifically, the second acquisition module 26 acquires the output voltage of the rectifier module 23 by means of resistor voltage division, and transmits it to the second control module 22 after filtering. The ninth resistor R9 and the tenth resistor R10 form a voltage division circuit, and the eleventh resistor R11 and the fifth capacitor C5 form a filtering circuit.

[0092] It should be noted that the second acquisition module 26 may also be replaced by other units that realize its functions, and is not limited thereto.

[0093] like Figure 2 As shown, the charging device 10 further includes a third acquisition module 14. The third acquisition module 14 is electrically connected to the voltage adjustment module 12, the transmitting module 13 and the first control module 11 respectively.

[0094] Specifically, the third acquisition module 14 is used to acquire the output voltage of the voltage adjustment module 12. The first control module 11 is used to monitor the transmission power of the transmission module 13 according to the output voltage of the voltage adjustment module 12 to ensure the accuracy of the transmission power.

[0095] like Figure 3 As shown, the third acquisition module 14 includes a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14 and a sixth capacitor C6. The first end of the twelfth resistor R12 is electrically connected to the voltage adjustment module 12 and the transmitting module 13, respectively, the second end of the twelfth resistor R12 is electrically connected to the first end of the thirteenth resistor R13 and the first end of the fourteenth resistor R14, respectively, the second end of the fourteenth resistor R14 is electrically connected to the first end of the sixth capacitor C6 and the first control module 11, and the second end of the thirteenth resistor R13 and the second end of the sixth capacitor C6 are both grounded.

[0096] Specifically, the third acquisition module 14 acquires the output voltage of the voltage adjustment module 12 by means of resistor voltage division, and transmits it to the first control module 11 after filtering. Among them, the twelfth resistor R12 and the thirteenth resistor R13 form a voltage division circuit, and the fourteenth resistor R14 and the sixth capacitor C6 form a filtering circuit.

[0097] It should be noted that the third acquisition module 14 may also be replaced by other units that realize its functions, and is not limited thereto.

[0098] The present application also provides a charging method, which is applied to a device to be charged 20, such as Figure 5 As shown, the charging method includes step S501 to step S502.

[0099] S501 : Obtain the output voltage of the charging module 24 and the output voltage of the rectifying module 23 .

[0100] Specifically, the second control module 22 obtains the output voltage of the charging module 24 through the first acquisition module 25 , and obtains the output voltage of the rectifying module 23 through the second acquisition module 26 .

[0101] S502. Output a first instruction based on the output voltage of the charging module 24 and the output voltage of the rectifier module 23. The first instruction is used to instruct the charging device 10 to adjust the transmission power of the transmission module 13 so that the output voltage of the rectifier module 23 is a target voltage; wherein the target voltage is the sum of the output voltage of the charging module 24 and a preset voltage.

[0102] Specifically, the second control module 22 determines the target voltage according to the output voltage of the charging module 24; the second control module 22 outputs the first instruction according to the target voltage and the output voltage of the rectifier module 23. The target voltage is the minimum voltage that satisfies the normal operation of the charging module 24, specifically the sum of the output voltage of the charging module 24 and the preset voltage, which is caused by the internal circuit of the charging module 24 and is generally 200mV or 300mV.

[0103] The specific process of the second control module 22 outputting the first instruction according to the target voltage and the output voltage of the rectifier module 23 is as follows: the second control module 22 compares the target voltage with the output voltage of the rectifier module 23, and when the output voltage of the rectifier module 23 is less than the target voltage, the first instruction is output to the charging device 10. After receiving the first instruction, the first control module 11 in the charging device 10 outputs a first control signal to the voltage adjustment module 12, and the voltage adjustment module 12 adjusts its output voltage according to the first control signal to adjust the transmission power of the transmission module 13 so that the output voltage of the rectifier module 23 is the target voltage.

[0104] From the above, it can be seen that the charging method provided in the embodiment of the present application dynamically adjusts the transmission power of the transmitting module 13 according to the output voltage of the charging module 24, so that the output voltage of the rectifier module 23 is the target voltage, so that the voltage drop between the output voltage of the charging module 24 and the output voltage of the rectifier module 23 is always a preset voltage. Since the voltage value of the preset voltage is very small, the energy loss of the charging module 24 is greatly reduced, and the energy conversion efficiency of the entire charging system is improved.

[0105] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0106] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A charging system, characterized in that: It includes a charging device and a device to be charged; the charging device includes a first control module, a voltage adjustment module and a transmitting module, the first control module is electrically connected to the voltage adjustment module and the transmitting module respectively, and the voltage adjustment module is electrically connected to the transmitting module; the device to be charged includes a receiving module, a second control module, a rectifier module, a charging module, a first acquisition module and a second acquisition module, the second control module is electrically connected to the receiving module, the first acquisition module and the second acquisition module respectively, the rectifier module is electrically connected to the receiving module, the charging module and the second acquisition module respectively, and the charging module is electrically connected to the battery and the first acquisition module respectively; The first acquisition module is used to acquire the output voltage of the charging module; The second acquisition module is used to collect the output voltage of the rectifier module; The second control module is used to output a first instruction according to the output voltage of the charging module and the output voltage of the rectifier module, and transmit the first instruction to the first control module through the receiving module and the transmitting module; The first control module is used to output a first control signal to the voltage adjustment module according to the first instruction; The voltage adjustment module is used to adjust its output voltage according to the first control signal to adjust the transmission power of the transmission module so that the output voltage of the rectifier module is a target voltage; wherein the target voltage is the sum of the output voltage of the charging module and a preset voltage.

2. The charging system according to claim 1, characterized in that: The voltage adjustment module includes a DC / DC conversion unit and a voltage adjustment unit; the voltage adjustment unit is electrically connected to the DC / DC conversion unit, the first control module and the transmitting module respectively, and the DC / DC conversion unit is electrically connected to the first control module and the power supply respectively; The first control module is used to output an enable signal to the DC / DC conversion unit; The DC / DC conversion unit is used to convert the voltage provided by the power supply according to the enable signal; The voltage adjustment unit is used to output a feedback voltage to the DC / DC conversion unit according to the first control signal, so that the DC / DC conversion unit adjusts its output voltage according to the feedback voltage.

3. The charging system according to claim 2, characterized in that: The voltage adjustment unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a switch tube and a first capacitor; the first end of the first resistor is electrically connected to the first end of the fifth resistor, the DC / DC conversion unit and the transmitting module respectively, the second end of the first resistor is electrically connected to the DC / DC conversion unit, the first end of the second resistor and the first end of the third resistor respectively, the second end of the third resistor is electrically connected to the first end of the first capacitor and the first end of the fourth resistor respectively, the second end of the fourth resistor is electrically connected to the second end of the fifth resistor and the first conduction end of the switch tube respectively, the control end of the switch tube is electrically connected to the first control module, and the second conduction end of the switch tube, the second end of the second resistor and the second end of the first capacitor are all grounded.

4. The charging system according to claim 2, characterized in that: The DC / DC conversion unit includes a DC / DC conversion chip, a second capacitor, a third capacitor and a first inductor; the power supply pin of the DC / DC conversion chip is electrically connected to the first end of the third capacitor and the power supply, respectively, the enable pin of the DC / DC conversion chip is electrically connected to the first control module, the feedback pin of the DC / DC conversion chip is electrically connected to the voltage adjustment unit, the output pin of the DC / DC conversion chip is electrically connected to the first end of the first inductor, the second end of the first inductor is electrically connected to the first end of the second capacitor, the voltage adjustment unit and the transmitting module, respectively, and the second end of the second capacitor, the second end of the third capacitor and the ground pin of the DC / DC conversion chip are all grounded.

5. The charging system according to claim 1, characterized in that: The first acquisition module includes a sixth resistor, a seventh resistor, an eighth resistor and a fourth capacitor; the first end of the sixth resistor is electrically connected to the positive electrode of the battery and the charging module respectively, the second end of the sixth resistor is electrically connected to the first end of the seventh resistor and the first end of the eighth resistor respectively, the second end of the seventh resistor is electrically connected to the first end of the fourth capacitor and the second control module respectively, and the second end of the eighth resistor and the second end of the fourth capacitor are both grounded.

6. The charging system according to claim 1, characterized in that: The second acquisition module includes a ninth resistor, a tenth resistor, an eleventh resistor and a fifth capacitor; the first end of the ninth resistor is electrically connected to the rectifier module and the charging module respectively, the second end of the ninth resistor is electrically connected to the first end of the tenth resistor and the first end of the eleventh resistor respectively, the second end of the eleventh resistor is electrically connected to the first end of the fifth capacitor and the second control module respectively, and the second end of the tenth resistor and the second end of the fifth capacitor are both grounded.

7. The charging system according to any one of claims 1 to 6, characterized in that: The charging device further includes a third acquisition module, and the third acquisition module is electrically connected to the voltage adjustment module, the transmitting module and the first control module respectively; The third acquisition module is used to acquire the output voltage of the voltage adjustment module; The first control module is used to monitor the transmission power of the transmission module according to the output voltage of the voltage adjustment module.

8. The charging system according to claim 7, characterized in that: The third acquisition module includes a twelfth resistor, a thirteenth resistor, a fourteenth resistor and a sixth capacitor; the first end of the twelfth resistor is electrically connected to the voltage adjustment module and the transmitting module respectively, the second end of the twelfth resistor is electrically connected to the first end of the thirteenth resistor and the first end of the fourteenth resistor respectively, the second end of the fourteenth resistor is electrically connected to the first end of the sixth capacitor and the first control module respectively, and the second end of the thirteenth resistor and the second end of the sixth capacitor are both grounded.

9. A charging method, applied to a device to be charged, characterized in that: include: Obtain the output voltage of the charging module and the output voltage of the rectifier module; A first instruction is output according to the output voltage of the charging module and the output voltage of the rectifier module; the first instruction is used to instruct the charging device to adjust the transmission power of the transmission module so that the output voltage of the rectifier module is a target voltage; wherein the target voltage is the sum of the output voltage of the charging module and a preset voltage.

10. The charging method according to claim 9, characterized in that: The step of outputting a first instruction according to the output voltage of the charging module and the output voltage of the rectifying module comprises: Determining the target voltage according to the output voltage of the charging module; The first instruction is output according to the target voltage and the output voltage of the rectifier module.

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