Wireless charging circuit and wireless charging device

Abstract

The embodiment of the present invention discloses a wireless charging circuit and a wireless charging device, the circuit includes a main control module, a power input module, and at least two charging modules, each charging module includes a voltage conversion unit, a driving LC resonance unit and a carrier decoding unit; in each charging module: the carrier decoding unit is used to decode the carrier signal sent by the charged device into a digital signal; the main control module is used to control the driving voltage output by the voltage conversion unit to increase through the output signal of the first duty cycle output terminal when the digital signal is determined to be a power increase signal; when the digital signal is determined to be a power reduction signal, the driving voltage output by the voltage conversion unit is controlled to decrease through the output signal of the first duty cycle output terminal; and when the driving voltage is increased or decreased, the absolute value of the difference between the driving voltage and the working voltage obtained by the voltage conversion unit is greater than or equal to the preset voltage difference threshold. This solution can effectively avoid the occurrence of serial code phenomenon in the wireless charging process.

Description

Technical Field

[0001] The present invention relates to the field of wireless charging, and in particular to a wireless charging circuit and a wireless charging device. Background Art

[0002] Magnetic induction wireless charging technology has the advantages of charging whenever you place it, no mechanical contact, and no wear on charging components. With the advancement and improvement of wireless charging technology, more and more electronic products are equipped with wireless charging functions, such as mobile phones, Bluetooth headsets, etc. At present, the shipment volume of wireless charging transmitters has reached hundreds of millions of units per year. With the increase in demand, more and more wireless charging transmitters have dual charging or multi-charging functions. However, existing multi-charging devices have a serial code phenomenon. Serial code means that when one device is charging normally, other devices will have uncontrollable energy output. For example, when the device is not placed on the charging coil, it also has a large energy output. If the wireless charging transmitter has a serial code phenomenon, it will cause the working indication status to be unrecognizable, and it will cause equipment damage. In severe cases, it will cause fires and cause casualties to houses and people. Summary of the invention

[0003] In view of the above problems, the present invention provides a wireless charging circuit and a wireless charging device.

[0004] An embodiment of the present invention provides a wireless charging circuit, which includes a main control module, a power input module, and at least two charging modules, each of which includes a voltage conversion unit, a driving LC resonance unit, and a carrier decoding unit;

[0005] The power input module is connected to each voltage conversion unit and the main control module, and is used to provide working voltage for each voltage conversion unit and the main control module;

[0006] In each charging module:

[0007] When the driving LC resonance unit obtains the driving voltage from the voltage conversion unit, the driving LC resonance unit is used to generate a magnetic field coupling with the charged device to wirelessly charge the charged device;

[0008] The carrier decoding unit is used to decode the carrier signal sent by the charged device into a digital signal;

[0009] The main control module is used to control the driving voltage output by the voltage conversion unit to increase through the output signal of the first duty cycle output terminal when it is determined that the digital signal is a power increase signal; and to control the driving voltage output by the voltage conversion unit to decrease through the output signal of the first duty cycle output terminal when it is determined that the digital signal is a power reduction signal; and when the driving voltage is increased or decreased, the absolute value of the difference between the driving voltage and the operating voltage obtained by the voltage conversion unit is greater than or equal to a preset voltage difference threshold.

[0010] The above main control module is also used for:

[0011] When the driving voltage is boosted to a preset first voltage threshold, if the digital signal is still the power boost signal, the main control module controls the driving LC resonance unit to reduce the resonance frequency through an output signal of the second duty cycle output terminal;

[0012] When the driving voltage is reduced to a preset second voltage threshold, if the digital signal is still the power reduction signal, the main control module controls the driving LC resonance unit to increase the resonance frequency through the output signal of the second duty cycle output terminal.

[0013] The voltage conversion unit includes a buck-boost element and a peripheral circuit corresponding to the buck-boost element, wherein the buck-boost element includes a voltage output pin, a feedback pin, a first voltage conversion pin, a second voltage conversion pin, a first auxiliary pin, a second auxiliary pin, an enable pin, a power pin, a first ground pin, a test pin, a limit pin, an operating voltage input pin, a second ground pin, a battery positive pin, and a battery negative pin;

[0014] The corresponding peripheral circuit includes a buck-boost auxiliary circuit, an output voltage control circuit and a basic circuit;

[0015] The buck-boost auxiliary circuit is used to cooperate with the internal circuit of the buck-boost element to perform buck-boost, the first voltage conversion pin is connected to the first end of the buck-boost auxiliary circuit, the second voltage conversion pin is connected to the second end of the buck-boost auxiliary circuit, the first auxiliary pin is connected to the third end of the buck-boost auxiliary circuit, and the second auxiliary pin is connected to the fourth end of the buck-boost auxiliary circuit;

[0016] The output voltage control circuit is used to control the buck-boost of the buck-boost element according to the output signal of the first duty cycle output terminal, the feedback pin is connected to the feedback terminal of the output voltage control circuit, the voltage output pin is connected to the voltage sampling terminal of the output voltage control circuit, and the signal acquisition terminal of the output voltage control circuit is connected to the first duty cycle output terminal;

[0017] The basic circuit is used to provide energy support for the step-up and step-down process, the enable pin is connected to the first interface of the basic circuit, the power pin is connected to the second interface of the basic circuit, the first ground pin is connected to the third interface of the basic circuit, the test pin is connected to the fourth interface of the basic circuit, the limit pin is connected to the fifth interface of the basic circuit, the working voltage input pin is connected to the sixth interface of the basic circuit, the second ground pin is connected to the seventh interface of the basic circuit, the battery positive pin is connected to the eighth interface of the basic circuit, and the battery negative pin is connected to the ninth interface of the basic circuit.

[0018] The buck-boost auxiliary circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor and an inductor;

[0019] One end of the inductor, one end of the first capacitor and one end of the first resistor are connected to the first end, the other end of the first capacitor is connected to the third end, the other end of the first resistor is connected to one end of the third capacitor, and the other end of the third capacitor is grounded;

[0020] The other end of the inductor, one end of the second capacitor and one end of the second resistor are connected to the second end, the other end of the second capacitor is connected to the fourth end, the other end of the second resistor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is grounded.

[0021] The output voltage control circuit comprises a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor;

[0022] The fifth capacitor, the sixth capacitor, the seventh capacitor and the eighth capacitor are connected in parallel, one end of the parallel connection, one end of the third resistor, one end of the fifth resistor and one end of the seventh resistor are connected to the voltage sampling end of the output voltage control circuit, the other end of the parallel connection is grounded, the other end of the third resistor is respectively connected to one end of the fourth resistor and one end of the ninth capacitor, and the other end of the fourth resistor and the other end of the ninth capacitor are grounded;

[0023] The other end of the fifth resistor is connected to one end of the tenth capacitor, the other end of the tenth capacitor is connected to one end of the sixth resistor, the other end of the seventh resistor, one end of the eighth resistor and one end of the ninth resistor, the other end of the sixth resistor is grounded, the other end of the eighth resistor is connected to the feedback end, the other end of the ninth resistor is connected to one end of the tenth resistor and one end of the eleventh capacitor, the other end of the tenth resistor is connected to the signal acquisition end, and the other end of the eleventh capacitor is grounded.

[0024] The basic circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor and a fifteenth capacitor;

[0025] One end of the eleventh resistor and one end of the twelfth resistor are connected to the first interface, and the other end of the eleventh resistor is connected to the power input module;

[0026] The other end of the twelfth resistor and one end of the twelfth capacitor are connected to the second interface, and the other end of the twelfth capacitor is connected to the third interface and the fourth interface and is grounded;

[0027] One end of the thirteenth resistor is connected to the fifth interface, and the other end of the thirteenth resistor is connected to the fourth interface;

[0028] One end of the thirteenth capacitor, one end of the fourteenth capacitor and one end of the fifteenth capacitor are connected to the sixth interface and connected to the power input module;

[0029] The other end of the thirteenth capacitor, the other end of the fourteenth capacitor and the other end of the fifteenth capacitor are connected to the seventh interface and grounded;

[0030] One end of the fourteenth resistor is connected to the eighth interface, one end of the fifteenth resistor is connected to the ninth interface, and the other end of the fourteenth resistor and the other end of the fifteenth resistor are grounded.

[0031] In another embodiment of the present invention, the driven LC resonance unit includes a bridge driving circuit and an LC resonance circuit, wherein the bridge driving circuit is used to convert the driving voltage into an alternating current, so as to utilize the alternating current to generate an alternating magnetic field on a transmitting coil of the LC resonance circuit, and the alternating magnetic field is used to generate a magnetic field coupling with a receiving coil of a charged device.

[0032] The carrier decoding unit includes a voltage decoding circuit. When magnetic field coupling is generated, the voltage decoding circuit receives the resonance signal output by the LC resonance circuit and decodes the digital signal according to the amplitude change of the resonance signal.

[0033] The carrier decoding unit further includes a current decoding circuit, which decodes the alternating current received from the bridge driving circuit to obtain a current decoding signal. The main control module compares the current decoding signal with the digital signal to verify the digital signal.

[0034] An embodiment of the present invention relates to a wireless charging device, and the wireless charging device includes the wireless charging circuit described in the embodiment of the present invention.

[0035] The present invention discloses a wireless charging circuit, which includes a main control module, a power input module, and at least two charging modules, each of which includes a voltage conversion unit, a driving LC resonance unit, and a carrier decoding unit; the power input module is connected to each voltage conversion unit and the main control module, and is used to provide working voltage for each voltage conversion unit and the main control module. In each charging module: when the driving LC resonance unit obtains the driving voltage from the voltage conversion unit, the driving LC resonance unit is used to generate a magnetic field coupling with the charged device to wirelessly charge the charged device; the carrier decoding unit is used to decode the carrier signal sent by the charged device into a digital signal; the main control module is used to control the driving voltage output by the voltage conversion unit to increase through the output signal of the first duty cycle output terminal when determining that the digital signal is a power increase signal; when determining that the digital signal is a power reduction signal, the driving voltage output by the voltage conversion unit is controlled to decrease through the output signal of the first duty cycle output terminal; and when the driving voltage is increased or decreased, the absolute value of the difference between the driving voltage and the working voltage obtained by the voltage conversion unit is greater than or equal to a preset voltage difference threshold. The technical solution of the present invention can effectively avoid the phenomenon of serial code generation during the wireless charging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope of protection of the present invention. In each of the drawings, similar components are numbered similarly.

[0037] Figure 1 A schematic diagram of the structure of a wireless charging circuit provided by an embodiment of the present invention is shown;

[0038] Figure 2 A schematic diagram of the structure of a voltage conversion unit provided by an embodiment of the present invention is shown;

[0039] Figure 3 A circuit diagram of a voltage conversion unit provided by an embodiment of the present invention is shown;

[0040] Figure 4A schematic diagram showing the structure of another wireless charging circuit provided by an embodiment of the present invention is shown;

[0041] Figure 5 A schematic structural diagram of a driving LC resonance unit provided by an embodiment of the present invention is shown;

[0042] Figure 6 A circuit diagram of a voltage decoding circuit provided by an embodiment of the present invention is shown;

[0043] Figure 7 A circuit diagram of a current decoding circuit provided by an embodiment of the present invention is shown.

[0044] Description of main component symbols:

[0045] 1-main control module; 2-power input module; 3-charging module; 10-voltage conversion unit; 20-driving LC resonance unit; 30-carrier decoding unit; 101-boost and step-down auxiliary circuit; 102-output voltage control circuit; 103-basic circuit. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0047] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0048] Hereinafter, the terms "including", "having" and their cognates, which may be used in various embodiments of the present invention, are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or adding the possibility of one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0049] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0050] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as those generally understood by those skilled in the art to which the various embodiments of the present invention belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meanings as the contextual meanings in the relevant technical field and will not be interpreted as having idealized meanings or overly formal meanings unless clearly defined in the various embodiments of the present invention.

[0051] The present invention discloses a wireless charging circuit, which includes a main control module 1, a power input module 2, and at least two charging modules 3, each charging module 3 includes a voltage conversion unit 10, a driving LC resonance unit 20 and a carrier decoding unit 30; the power input module 2 is connected to each voltage conversion unit 10 and the main control module 1, and is used to provide working voltage for each voltage conversion unit 10 and the main control module 1.

[0052] In each charging module 3 of the wireless charging circuit:

[0053] When the driving LC resonance unit 20 obtains the driving voltage from the voltage conversion unit 10, the driving LC resonance unit 20 is used to generate magnetic field coupling with the charged device to wirelessly charge the charged device; the carrier decoding unit 30 is used to decode the carrier signal sent by the charged device into a digital signal; the main control module 1 is used to control the driving voltage output by the voltage conversion unit 10 to increase through the output signal of the first duty cycle output terminal when determining that the digital signal is a power increase signal; when determining that the digital signal is a power reduction signal, the driving voltage output by the voltage conversion unit 10 is controlled to decrease through the output signal of the first duty cycle output terminal; and when the driving voltage is increased or decreased, the absolute value of the difference between the driving voltage and the working voltage obtained by the voltage conversion unit 10 is greater than or equal to the preset voltage difference threshold. By boost charging or buck charging, the string code phenomenon in the wireless charging process is avoided.

[0054] Example 1

[0055] In this embodiment, see Figure 1 , shows a wireless charging circuit, including a main control module 1, a power input module 2, and at least two charging modules 3, each charging module 3 includes a voltage conversion unit 10, a driving LC resonance unit 20 and a carrier decoding unit 30; the power input module 2 is connected to each voltage conversion unit 10 and the main control module 1, and is used to provide working voltage for each voltage conversion unit 10 and the main control module 1.

[0056] Wherein, in each charging module 3:

[0057] When the driving LC resonance unit 20 obtains the driving voltage from the voltage conversion unit 10, the driving LC resonance unit 20 is used to generate a magnetic field coupling with the charged device to wirelessly charge the charged device; the carrier decoding unit 30 is used to decode the carrier signal emitted by the charged device into a digital signal; the main control module 1 is used to control the driving voltage output by the voltage conversion unit 10 to increase through the output signal of the first duty cycle output terminal when it is determined that the digital signal is a power increase signal; when it is determined that the digital signal is a power reduction signal, the driving voltage output by the voltage conversion unit 10 is controlled to decrease through the output signal of the first duty cycle output terminal; and, when the driving voltage is increased or decreased, the absolute value of the difference between the driving voltage and the operating voltage obtained by the voltage conversion unit 10 is greater than or equal to a preset voltage difference threshold.

[0058] Magnetic field coupling refers to the phenomenon that the current change of a coil generates an induced electromotive force in the adjacent coil. For example, when there is current in a coil A, a magnetic field will be generated, and this magnetic field will pass through another adjacent coil B. If the current in coil A is an alternating current, the magnetic field it generates is also alternating. If there is an alternating magnetic field in coil B, an induced electromotive force will be generated in coil B.

[0059] There are generally two types of carrier signals emitted by the charged device: one is a power increase signal, and the other is a power reduction signal.

[0060] Among them, the power input module 2 includes at least one of a Type-C port input circuit, a USBA port input circuit, a DC port input circuit, and a Lightning port input circuit.

[0061] Exemplarily, when the digital signal received by the main control module 1 is a power-up signal, the main control module 1 controls the driving voltage output by the voltage conversion unit 10 to increase through the output signal of the first duty cycle output terminal. If the working voltage obtained by the voltage conversion unit 10 from the power input module 2 is 9V and the preset voltage difference threshold is 1V, the voltage conversion unit 10 can gradually increase the driving voltage from 10V; when the digital signal received by the main control module 1 is a power-down signal, the main control module 1 controls the driving voltage output by the voltage conversion unit 10 to decrease through the output signal of the first duty cycle output terminal. If the working voltage obtained by the voltage conversion unit 10 from the power input module 2 is 9V and the preset voltage difference threshold is 1V, the voltage conversion unit 10 can gradually decrease the driving voltage from 8V. The main control module 1 controls the boost charging or buck charging of the charging module 3 according to the carrier signal sent by the charged device, effectively ensuring the effective use of energy, and when the driving voltage is increased or decreased, the absolute value of the difference between the driving voltage and the working voltage obtained by the voltage conversion unit 10 is greater than or equal to the preset voltage difference threshold, which can effectively avoid the occurrence of serial code phenomenon in the wireless charging process.

[0062] Example 2

[0063] Furthermore, when the driving voltage is boosted to a preset first voltage threshold, if the digital signal is still a power-up signal, the main control module 1 controls the driving LC resonance unit 20 to reduce the resonance frequency through the output signal of the second duty cycle output terminal; when the driving voltage is reduced to a preset second voltage threshold, if the digital signal is still a power-down signal, the main control module 1 controls the driving LC resonance unit 20 to increase the resonance frequency through the output signal of the second duty cycle output terminal.

[0064] Exemplarily, if the first voltage threshold is 12V, then when the driving voltage is boosted to 12V, the digital signal received by the main control module 1 is still a power increase signal, and the main control module 1 controls the LC resonance unit 20 to reduce the resonance frequency through the output signal of the second duty cycle output terminal, so as to increase the charging power of the charging module 3; if the second voltage threshold is 3V, then when the driving voltage is reduced to 3V, the digital signal received by the main control module 1 is still a power reduction signal, and the main control module 1 controls the LC resonance unit 20 to increase the resonance frequency through the output signal of the second duty cycle output terminal, so as to reduce the charging power of the charging module 3.

[0065] Example 3

[0066] In this embodiment, see Figure 2 A voltage conversion unit 10 includes a buck-boost element and a peripheral circuit corresponding to the buck-boost element, wherein the buck-boost element includes a voltage output pin VO, a feedback pin FB, a first voltage conversion pin SW1, a second voltage conversion pin SW2, a first auxiliary pin BST1, a second auxiliary pin BST2, an enable pin EN, a power pin VCC, a first ground pin GND, a test pin TEST, a limit pin 0LIM, an operating voltage input pin VIN, a second ground pin PGND, a battery positive pin CSP, and a battery negative pin CSN.

[0067] The corresponding peripheral circuit includes a buck-boost auxiliary circuit 101 , an output voltage control circuit 102 and a basic circuit 103 .

[0068] The buck-boost auxiliary circuit 101 is used to cooperate with the internal circuit of the buck-boost element to perform buck-boost. The first voltage conversion pin SW1 is connected to the first end of the buck-boost auxiliary circuit 101, the second voltage conversion pin SW2 is connected to the second end of the buck-boost auxiliary circuit 101, the first auxiliary pin BST1 is connected to the third end of the buck-boost auxiliary circuit 101, and the second auxiliary pin BST2 is connected to the fourth end of the buck-boost auxiliary circuit 101.

[0069] The output voltage control circuit 102 is used to control the buck-boost element's buck-boost according to the output signal of the first duty cycle output terminal. The feedback pin FB is connected to the feedback terminal of the output voltage control circuit 102. The voltage output pin VO is connected to the voltage sampling terminal of the output voltage control circuit 102. The signal acquisition terminal of the output voltage control circuit 102 is connected to the first duty cycle output terminal.

[0070] The basic circuit 103 is used to provide energy support for the step-up and step-down process, the enable pin EN is connected to the first interface of the basic circuit 103, the power pin VCC is connected to the second interface of the basic circuit 103, the first ground pin GND is connected to the third interface of the basic circuit 103, the test pin TEST is connected to the fourth interface of the basic circuit 103, the limit pin 0LIM is connected to the fifth interface of the basic circuit 103, the working voltage input pin VIN is connected to the sixth interface of the basic circuit 103, the second ground pin PGND is connected to the seventh interface of the basic circuit 103, the battery positive pin CSP is connected to the eighth interface of the basic circuit 103, and the battery negative pin CSN is connected to the ninth interface of the basic circuit 103.

[0071] Further, such as Figure 3 As shown, the buck-boost auxiliary circuit 101 includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor and an inductor; one end of the inductor, one end of the first capacitor and one end of the first resistor are connected to the first end, the other end of the first capacitor is connected to the third end, the other end of the first resistor is connected to one end of the third capacitor, and the other end of the third capacitor is grounded; the other end of the inductor, one end of the second capacitor and one end of the second resistor are connected to the second end, the other end of the second capacitor is connected to the fourth end, the other end of the second resistor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is grounded.

[0072] Further, such as Figure 3As shown, the output voltage control circuit 102 includes a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor; the fifth capacitor, the sixth capacitor, the seventh capacitor and the eighth capacitor are connected in parallel, one end of the parallel connection, one end of the third resistor, one end of the fifth resistor and one end of the seventh resistor are connected to the voltage sampling end of the output voltage control circuit 102, and the other end of the parallel connection is grounded, the other end of the third resistor is respectively connected to one end of the fourth resistor and one end of the ninth capacitor, and the other end of the fourth resistor and the other end of the ninth capacitor are grounded; the other end of the fifth resistor is connected to one end of the tenth capacitor, the other end of the tenth capacitor is connected to one end of the sixth resistor, the other end of the seventh resistor, one end of the eighth resistor and one end of the ninth resistor, the other end of the sixth resistor is grounded, the other end of the eighth resistor is connected to the feedback end, the other end of the ninth resistor is connected to one end of the tenth resistor and one end of the eleventh capacitor, the other end of the tenth resistor is connected to the signal acquisition end, and the other end of the eleventh capacitor is grounded.

[0073] Further, such as Figure 3 As shown, the basic circuit 103 includes an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, and a fifteenth capacitor; one end of the eleventh resistor and one end of the twelfth resistor are connected to the first interface, and the other end of the eleventh resistor is connected to the power input module 2; the other end of the twelfth resistor and one end of the twelfth capacitor are connected to the second interface, and the other end of the twelfth capacitor is connected to the third interface and the fourth interface, and is grounded; one end of the thirteenth resistor is connected to the fifth interface, and the other end of the thirteenth resistor is connected to the fourth interface; one end of the thirteenth capacitor, one end of the fourteenth capacitor and one end of the fifteenth capacitor are connected to the sixth interface, and are connected to the power input module 2; the other end of the thirteenth capacitor, the other end of the fourteenth capacitor and the other end of the fifteenth capacitor are connected to the seventh interface, and are grounded; one end of the fourteenth resistor is connected to the eighth interface, one end of the fifteenth resistor is connected to the ninth interface, and the other end of the fourteenth resistor and the other end of the fifteenth resistor are grounded.

[0074] Example 4

[0075] In this embodiment, see Figure 4 The driving LC resonance unit 20 includes a bridge driving circuit and an LC resonance circuit. The bridge driving circuit is used to convert the driving voltage into an alternating current, so as to generate an alternating magnetic field on the transmitting coil of the LC resonance circuit using the alternating current. The alternating magnetic field is used to generate a magnetic field coupling with the receiving coil of the charged device.

[0076] Furthermore, the carrier decoding unit 30 includes a voltage decoding circuit. When magnetic field coupling is generated, the voltage decoding circuit receives the resonance signal output by the LC resonance circuit and decodes the digital signal according to the amplitude change of the resonance signal.

[0077] Furthermore, the carrier decoding unit 30 also includes a current decoding circuit, which decodes the alternating current received from the bridge driving circuit to obtain a current decoding signal, and the main control module 1 compares the current decoding signal with the digital signal to verify the digital signal.

[0078] Exemplarily, the LC resonance unit 20 is driven as follows Figure 5 VCC_COIL_IN2 is connected to the voltage output pin of the voltage conversion unit 10 so that the bridge driving circuit obtains the driving voltage, and the bridge driving circuit can convert the driving voltage into an alternating current to generate an alternating magnetic field on the transmitting coil of the LC resonant circuit using the alternating current.

[0079] Further, such as Figure 6 The V BACK-B terminal of the driving LC resonance unit 20 is connected to the V BACK-B terminal of the voltage decoding circuit of the carrier decoding unit 30. When the transmitting coil L2 of the driving LC resonance unit 20 generates magnetic field coupling with the receiving coil of the charged device, the V BACK-B terminal of the voltage decoding circuit receives the resonance signal output by the LC resonance circuit, decodes the digital signal according to the amplitude change of the resonance signal, and sends the voltage digital signal to the main control module 1 through the V CODE-B terminal.

[0080] Further, such as Figure 7 As shown. The I OUT-B terminal of the driving LC resonance unit 20 is connected to the I OUT-B terminal of the current decoding circuit of the carrier decoding unit 30. When the transmitting coil L2 of the driving LC resonance unit 20 generates magnetic field coupling with the receiving coil of the charged device, the I OUT-B terminal of the current decoding circuit receives the current signal output by the LC resonance circuit, decodes the digital signal according to the current signal, and sends the digital signal of the current to the main control module 1 through the I CODE-B terminal. The main control module 1 compares the current decoding signal with the digital signal to verify the digital signal.

[0081] Furthermore, an embodiment of the present invention relates to a wireless charging device, and the wireless charging device includes the wireless charging circuit of the embodiment of the present invention.

[0082] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and structure diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and a part of the module, program segment or code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in an alternative implementation, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the structure diagram and / or the flow diagram, and the combination of boxes in the structure diagram and / or the flow diagram, can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0083] In addition, the functional modules or units in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0084] If the function is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a smart phone, a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0085] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A wireless charging circuit, characterized in that: The circuit includes a main control module, a power input module, and at least two charging modules, each of which includes a voltage conversion unit, a driving LC resonance unit, and a carrier decoding unit; The power input module is connected to each voltage conversion unit and the main control module, and is used to provide working voltage for each voltage conversion unit and the main control module; In each charging module: When the driving LC resonance unit obtains the driving voltage from the voltage conversion unit, the driving LC resonance unit is used to generate a magnetic field coupling with the charged device to wirelessly charge the charged device; The carrier decoding unit is used to decode the carrier signal sent by the charged device into a digital signal; The main control module is used to control the driving voltage output by the voltage conversion unit to increase through the output signal of the first duty cycle output terminal when the digital signal is determined to be a power increase signal; and control the driving voltage output by the voltage conversion unit to decrease through the output signal of the first duty cycle output terminal when the digital signal is determined to be a power reduction signal; Furthermore, when the driving voltage is increased or decreased, the absolute value of the difference between the driving voltage and the working voltage obtained by the voltage conversion unit is greater than or equal to a preset voltage difference threshold; The main control module is also used for: when the driving voltage is boosted to a preset first voltage threshold, if the digital signal is still the power boost signal, the main control module controls the driving LC resonance unit to reduce the resonance frequency through the output signal of the second duty cycle output terminal; When the driving voltage is reduced to a preset second voltage threshold, if the digital signal is still the power reduction signal, the main control module controls the driving LC resonance unit to increase the resonance frequency through the output signal of the second duty cycle output terminal.

2. The wireless charging circuit according to claim 1, characterized in that: The voltage conversion unit includes a buck-boost element and a peripheral circuit corresponding to the buck-boost element, wherein the buck-boost element includes a voltage output pin, a feedback pin, a first voltage conversion pin, a second voltage conversion pin, a first auxiliary pin, a second auxiliary pin, an enable pin, a power pin, a first ground pin, a test pin, a limit pin, a working voltage input pin, a second ground pin, a battery positive pin, and a battery negative pin; The corresponding peripheral circuit includes a buck-boost auxiliary circuit, an output voltage control circuit and a basic circuit; The buck-boost auxiliary circuit is used to cooperate with the internal circuit of the buck-boost element to perform buck-boost, the first voltage conversion pin is connected to the first end of the buck-boost auxiliary circuit, the second voltage conversion pin is connected to the second end of the buck-boost auxiliary circuit, the first auxiliary pin is connected to the third end of the buck-boost auxiliary circuit, and the second auxiliary pin is connected to the fourth end of the buck-boost auxiliary circuit; The output voltage control circuit is used to control the buck-boost of the buck-boost element according to the output signal of the first duty cycle output terminal, the feedback pin is connected to the feedback terminal of the output voltage control circuit, the voltage output pin is connected to the voltage sampling terminal of the output voltage control circuit, and the signal acquisition terminal of the output voltage control circuit is connected to the first duty cycle output terminal; The basic circuit is used to provide energy support for the step-up and step-down process, the enable pin is connected to the first interface of the basic circuit, the power pin is connected to the second interface of the basic circuit, the first ground pin is connected to the third interface of the basic circuit, the test pin is connected to the fourth interface of the basic circuit, the limit pin is connected to the fifth interface of the basic circuit, the working voltage input pin is connected to the sixth interface of the basic circuit, the second ground pin is connected to the seventh interface of the basic circuit, the battery positive pin is connected to the eighth interface of the basic circuit, and the battery negative pin is connected to the ninth interface of the basic circuit.

3. The wireless charging circuit according to claim 2, characterized in that: The buck-boost auxiliary circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor and an inductor; One end of the inductor, one end of the first capacitor and one end of the first resistor are connected to the first end, the other end of the first capacitor is connected to the third end, the other end of the first resistor is connected to one end of the third capacitor, and the other end of the third capacitor is grounded; The other end of the inductor, one end of the second capacitor and one end of the second resistor are connected to the second end, the other end of the second capacitor is connected to the fourth end, the other end of the second resistor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is grounded.

4. The wireless charging circuit according to claim 2, characterized in that: The output voltage control circuit includes a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor; The fifth capacitor, the sixth capacitor, the seventh capacitor and the eighth capacitor are connected in parallel, one end of the parallel connection, one end of the third resistor, one end of the fifth resistor and one end of the seventh resistor are connected to the voltage sampling end of the output voltage control circuit, the other end of the parallel connection is grounded, the other end of the third resistor is respectively connected to one end of the fourth resistor and one end of the ninth capacitor, and the other end of the fourth resistor and the other end of the ninth capacitor are grounded; The other end of the fifth resistor is connected to one end of the tenth capacitor, the other end of the tenth capacitor is connected to one end of the sixth resistor, the other end of the seventh resistor, one end of the eighth resistor and one end of the ninth resistor, the other end of the sixth resistor is grounded, the other end of the eighth resistor is connected to the feedback end, the other end of the ninth resistor is connected to one end of the tenth resistor and one end of the eleventh capacitor, the other end of the tenth resistor is connected to the signal acquisition end, and the other end of the eleventh capacitor is grounded.

5. The wireless charging circuit according to claim 2, characterized in that: The basic circuit includes an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor and a fifteenth capacitor; One end of the eleventh resistor and one end of the twelfth resistor are connected to the first interface, and the other end of the eleventh resistor is connected to the power input module; The other end of the twelfth resistor and one end of the twelfth capacitor are connected to the second interface, and the other end of the twelfth capacitor is connected to the third interface and the fourth interface and is grounded; One end of the thirteenth resistor is connected to the fifth interface, and the other end of the thirteenth resistor is connected to the fourth interface; One end of the thirteenth capacitor, one end of the fourteenth capacitor and one end of the fifteenth capacitor are connected to the sixth interface and connected to the power input module; The other end of the thirteenth capacitor, the other end of the fourteenth capacitor and the other end of the fifteenth capacitor are connected to the seventh interface and grounded; One end of the fourteenth resistor is connected to the eighth interface, one end of the fifteenth resistor is connected to the ninth interface, and the other end of the fourteenth resistor and the other end of the fifteenth resistor are grounded.

6. The wireless charging circuit according to claim 1, characterized in that: The driving LC resonance unit includes a bridge driving circuit and an LC resonance circuit. The bridge driving circuit is used to convert the driving voltage into an alternating current, so as to utilize the alternating current to generate an alternating magnetic field on the transmitting coil of the LC resonance circuit, and the alternating magnetic field is used to generate a magnetic field coupling with the receiving coil of the charged device.

7. The wireless charging circuit according to claim 6, characterized in that: The carrier decoding unit includes a voltage decoding circuit. When magnetic field coupling is generated, the voltage decoding circuit receives the resonance signal output by the LC resonance circuit and decodes the digital signal according to the amplitude change of the resonance signal.

8. The wireless charging circuit according to claim 7, characterized in that: The carrier decoding unit further includes a current decoding circuit, which decodes the alternating current received from the bridge driving circuit to obtain a current decoding signal, and the main control module compares the current decoding signal with the digital signal to verify the digital signal.

9. A wireless charging device, characterized in that: The wireless charging device comprises the wireless charging circuit according to any one of claims 1 to 8.

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