Wireless energy transmission circuit based on single-stage hybrid boost converter and related devices

Abstract

The application relates to the technical field of wireless power transmission, in particular to a wireless transmitting circuit based on a single-stage hybrid voltage boosting converter and related equipment, which comprises an LC resonance module, a direct-current input, a first voltage boosting conversion module and a second voltage boosting conversion module; the direct-current input is connected with the input end of the first voltage boosting conversion module and the input end of the second voltage boosting conversion module; the output end of the first voltage boosting conversion module is connected with the first end of the LC resonance module; and the output end of the second voltage boosting conversion module is connected with the second end of the LC resonance module; wherein the first voltage boosting conversion module and the second voltage boosting conversion module alternately input alternating currents at the two ends of the LC resonance module. According to the application, the first voltage boosting conversion module and the second voltage boosting conversion module are arranged at the two ends of the LC resonance module, alternating currents are input at the two ends, the high-voltage node of the voltage boosting converter directly drives the transmitting resonance circuit, the single-stage voltage boosting and inverting functions are realized, the cascade loss is reduced, and the energy transmission efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of wireless power transmission technology, and in particular to wireless transmission circuits and related equipment based on a single-stage hybrid boost converter. Background Technology

[0002] As portable electronic devices become more feature-rich, their battery capacities are increasing, making high-power wireless charging a convenient charging option.

[0003] In related technologies, in order to achieve high-power transmission, traditional wireless transmission chips adopt a two-stage architecture of DC-DC boost converter and inverter. However, the Boost converter has a limited transfer ratio and cannot output high voltage, which requires increasing the transmission current to increase power, increasing the resonant circuit loss and reducing efficiency. Moreover, the inductor current is large under high power, which will increase the inductor loss and further reduce efficiency. Summary of the Invention

[0004] In view of this, embodiments of this application propose a wireless transmission circuit and related equipment based on a single-stage hybrid boost converter, which can realize high-power, high-efficiency wireless power transmission and is beneficial to improving energy transmission efficiency.

[0005] To achieve the above objectives, one aspect of this application provides a wireless power transmission circuit based on a single-stage hybrid boost converter, the circuit including an LC resonant module, a DC input, a first boost converter module, and a second boost converter module; The DC input is connected to the input terminal of the first boost converter module and the input terminal of the second boost converter module. The output terminal of the first boost converter module is connected to the first terminal of the LC resonant module, and the output terminal of the second boost converter module is connected to the second terminal of the LC resonant module. The first boost converter module and the second boost converter module alternately input AC power at both ends of the LC resonant module to excite the LC resonant module.

[0006] In one embodiment, the first boost converter module and the second boost converter module are single-stage hybrid boost converters; The single-stage hybrid boost converter includes an on-chip power unit and an off-chip unit; The on-chip power unit is provided with several power switches, and the off-chip unit is provided with a first flying capacitor, a second flying capacitor, and a power inductor. Specifically, by controlling the power switch to turn on and off, the first flying capacitor and the second flying capacitor are charged alternately. The power inductor is magnetized when the first flying capacitor is charged and demagnetized when the second flying capacitor is charged.

[0007] In one embodiment, the slew rate of the single-stage hybrid boost converter is: , in, For the transfer ratio, This is the DC input voltage value. This refers to the discharge voltage value of the single-stage hybrid boost converter. The duty cycle of the control signal for the single-stage hybrid boost converter.

[0008] In one embodiment, under the same transfer ratio, the inductor current ratio of the single-stage hybrid boost converter is: , in, The average current of the inductor. This is the output current.

[0009] In one embodiment, the circuit further includes: A control module is used to control the first boost converter module and the second boost converter module.

[0010] In one embodiment, the control module includes: A soft-start unit is used to generate a reference voltage; A clock unit is used for a first square wave signal and a second square wave signal, wherein the phase difference between the first square wave signal and the second square wave signal is . Spend, Integers greater than or equal to 0; The first type III compensation unit is connected to the soft-start unit and the clock unit, and is used to generate a first control signal according to the reference voltage and the first square wave signal. The second type III compensation unit is connected to the soft-start unit and the clock unit, and is used to generate a second control signal according to the reference voltage and the second square wave signal. The first driving unit has its input end connected to the first type III compensation unit and its output end connected to the first boost converter module, and is used to drive the first boost converter module to turn on or off through the first control signal. The second drive unit has its input end connected to the second type III compensation unit and its output end connected to the second boost converter module. It is used to drive the second boost converter module to turn on or off through the second control signal.

[0011] In one embodiment, the first type III compensation unit and the second type III compensation unit are provided with a voltage divider resistor and a comparator, wherein the voltage divider resistor is disposed between the power input and the voltage feedback terminal of the comparator.

[0012] In one embodiment, both the voltage divider resistor and the voltage feedback terminal of the comparator are set to 1 / 10 of the voltage divider value of the power supply input.

[0013] To achieve the above objectives, another aspect of the embodiments of this application proposes a wireless power transmission system, the system including a wireless power receiving circuit and the wireless power transmitting circuit described above.

[0014] To achieve the above objectives, another aspect of this application provides an electronic device equipped with the wireless power transmission system described above, the wireless power transmission system being used for charging.

[0015] The embodiments of this application include at least the following beneficial effects: This application provides a wireless transmitting circuit and related equipment based on a single-stage hybrid boost converter. The scheme sets a first boost converter module and a second boost converter module at both ends of an LC resonant module, and alternately inputs AC power at both ends of the LC resonant module, so that the high-voltage node of the boost converter directly drives the transmitting resonant circuit, realizing single-stage boost and inversion functions, reducing cascading losses, and improving energy transmission efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a wireless transmission circuit based on a single-stage hybrid boost converter provided in an embodiment of this application; Figure 2 yes Figure 1 An exemplary circuit diagram of the wireless power transmission circuit shown; Figure 3 This is a schematic diagram of the working principle of a single-stage hybrid boost converter provided in the embodiments of this application, wherein (a) region represents the voltage change in the first working stage, and (b) region represents the voltage change in the second working stage; Figure 4 This is a schematic diagram comparing the key performance of the single-stage hybrid boost converter and the traditional boost converter provided in the embodiments of this application. (a) shows the comparison of the voltage conversion ratio, and (b) shows the proportion of inductor current.

[0017] Figure 5 This is a schematic diagram of the three-type compensation circuit provided in the embodiments of this application; Figure 6 This is a schematic diagram of the structure of a wireless power transmission system provided in an embodiment of this application; Figure 7 yes Figure 6 Simulation waveforms of key signals in the system shown; Figure 8 yes Figure 6 The simulation curves of the system efficiency versus load power are shown. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit it. In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of this application; they are merely examples of apparatuses and methods consistent with some aspects of the embodiments of this application as detailed in the appended claims.

[0019] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various concepts, but unless otherwise stated, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the words “if,” “when,” or “in response to a determination” as used herein may be interpreted as “when…” or “when…” or “in response to a determination.”

[0020] As used in this application, the terms "at least one", "multiple", "each", "any", etc., "at least one" includes one, two or more, "multiple" includes two or more, "each" refers to each of the corresponding multiples, and "any" refers to any one of the multiples.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0022] Before providing a detailed description of the embodiments of this application, some of the nouns and terms involved in the embodiments of this application will be explained first. The nouns and terms involved in the embodiments of this application are subject to the following interpretations.

[0023] As portable electronic devices become more feature-rich, their battery capacities are increasing, making high-power wireless charging a convenient charging option.

[0024] In related technologies, to achieve high-power transmission, traditional wireless transmitter chips employ a two-stage architecture consisting of a DC-DC boost converter and an inverter. However, the boost converter has a limited slip ratio, making it unable to output high voltage. This necessitates increasing the transmit current to improve power, increasing resonant circuit losses and reducing efficiency. Furthermore, the large inductor current at high power increases inductor losses, further reducing efficiency. This circuit structure leads to the following drawbacks in existing wireless transmitter chips: First, traditional wireless transmitter chips mostly adopt a two-stage architecture of traditional DC-DC boost converter and inverter, and the cascaded architecture reduces system efficiency.

[0025] Secondly, the traditional Boost converter has a limited switching ratio and cannot output a high enough voltage to drive the emitter resonant circuit. This requires increasing the emitter current to increase the output power, which increases the resonant circuit loss and reduces the system efficiency.

[0026] Third, under high-power transmission, traditional Boost converters have a large inductor current due to the use of only a single energy storage inductor, resulting in high inductor losses and reduced system efficiency.

[0027] In view of this, this application provides a wireless transmitting circuit and related equipment based on a single-stage hybrid boost converter. The solution uses a first boost converter module and a second boost converter module set at both ends of an LC resonant module. AC power is alternately input at both ends, so that the high-voltage node of the boost converter directly drives the transmitting resonant circuit, realizing single-stage boost and inversion functions, reducing cascading losses, and improving energy transmission efficiency.

[0028] See Figure 1 A wireless power transmission circuit based on a single-stage hybrid boost converter, the circuit including an LC resonant module, a DC input, a first boost converter module and a second boost converter module.

[0029] The DC input is connected to the input terminal of the first boost converter module and the input terminal of the second boost converter module. The output terminal of the first boost converter module is connected to the first terminal of the LC resonant module, and the output terminal of the second boost converter module is connected to the second terminal of the LC resonant module.

[0030] The first boost converter module and the second boost converter module alternately input AC power at both ends of the LC resonant module to excite the LC resonant module.

[0031] In this embodiment, a first boost converter module and a second boost converter module are set at both ends of the LC resonant module. AC power is alternately input at both ends, so that the high-voltage node of the boost converter directly drives the transmitting resonant circuit, realizing single-stage boost and inversion functions, reducing cascading losses and improving energy transmission efficiency.

[0032] In some embodiments, the first boost converter module and the second boost converter module are single-stage hybrid boost converters.

[0033] The single-stage hybrid boost converter includes an on-chip power unit and an off-chip unit. The on-chip power unit is equipped with several power switches, and the off-chip unit is equipped with a first flying capacitor, a second flying capacitor, and a power inductor. By controlling the on and off states of the power switches, the first flying capacitor and the second flying capacitor are charged alternately. The power inductor is magnetized when the first flying capacitor is charged and demagnetized when the second flying capacitor is charged.

[0034] In this embodiment, the hybrid converter incorporates a flying capacitor, which achieves a larger transfer ratio and higher output voltage compared to the traditional Boost converter. It can obtain a lower transmit current under high output power, reduce the loss of the transmit resonant circuit, and improve system efficiency.

[0035] In addition, the hybrid converter adds energy storage components and reduces the proportion of inductor current, which can achieve lower inductor current at the same output power, effectively reducing losses and improving system efficiency.

[0036] In some embodiments, the transfer ratio of the single-stage hybrid boost converter is: , in, For the transfer ratio, This is the DC input voltage value. This refers to the discharge voltage value of the single-stage hybrid boost converter. The duty cycle of the control signal for the single-stage hybrid boost converter.

[0037] In some embodiments, under the same transfer ratio, the inductor current ratio of the single-stage hybrid boost converter is: , in, The average current of the inductor. This is the output current.

[0038] In this embodiment, a single-stage boost converter is achieved by alternately charging and discharging the flying capacitor. Compared to existing boost converters, this embodiment can achieve a higher output voltage, obtain a lower transmit current at high output power, reduce transmit resonant circuit losses, and improve system efficiency.

[0039] In some embodiments, the circuit further includes a control module for controlling the first boost converter module and the second boost converter module.

[0040] In some specific embodiments, the control module includes: A soft-start unit is used to generate a reference voltage; A clock unit is used for a first square wave signal and a second square wave signal, wherein the phase difference between the first square wave signal and the second square wave signal is . Spend, Integers greater than or equal to 0; The first type III compensation unit is connected to the soft-start unit and the clock unit, and is used to generate a first control signal according to the reference voltage and the first square wave signal. The second type III compensation unit is connected to the soft-start unit and the clock unit, and is used to generate a second control signal according to the reference voltage and the second square wave signal. The first driving unit has its input end connected to the first type III compensation unit and its output end connected to the first boost converter module, and is used to drive the first boost converter module to turn on or off through the first control signal. The second drive unit has its input end connected to the second type III compensation unit and its output end connected to the second boost converter module. It is used to drive the second boost converter module to turn on or off through the second control signal.

[0041] In some embodiments, the first type III compensation unit and the second type III compensation unit are provided with a voltage divider resistor and a comparator, wherein the voltage divider resistor is disposed between the power input and the voltage feedback terminal of the comparator.

[0042] In some embodiments, both the voltage divider resistor and the voltage feedback terminal of the comparator are set to 1 / 10 of the voltage divider value of the power supply input.

[0043] This embodiment improves the three-type compensation circuit, allowing the high output voltage to be directly fed back to the on-chip controller, eliminating the need for external resistors and capacitors to build the compensation circuit.

[0044] The following is a detailed description and explanation of the embodiments of the present invention, using a specific wireless power transmission circuit as an example: See Figure 2This application provides a wireless power transmission circuit. A first boost converter module and a second boost converter module are set at both ends of an LC resonant module. AC power is alternately input at both ends, so that the high-voltage node of the boost converter directly drives the transmitting resonant circuit, realizing single-stage boost and inversion functions, reducing cascading losses and improving energy transmission efficiency.

[0045] The wireless power transmission circuit includes a control section and a power section.

[0046] (a) Power section: The upper and lower sections are two identical single-stage hybrid boost converters, which realize the input voltage V IN Its boost and inverter functions. Power transistor S 0L -S 7L Construct a converter, S 0R -S 7R This forms another converter. The two converters are completely identical, except for the control signal V. PWM1 With V PWM2 There is a 180-degree phase difference, forming a two-phase full-bridge inverter.

[0047] In the off-chip portion of a single-stage hybrid boost converter, the flying capacitor C F1 -C F4 The power inductors L1 and L2, together with the on-chip power circuitry, constitute a single-stage hybrid boost converter. The transmitting inductor L... TX and emitter capacitance C TX To form a transmitting resonant circuit, a voltage V is used. TX1 and V TX2 Driven to achieve wireless power transmission.

[0048] The first and second boost converter modules are identical single-stage hybrid boost converters.

[0049] See Figure 3 The working principle of a single-stage hybrid boost converter is as follows: In the first operating phase, power switches 0, 4, 5, and 7 are off, while power transistors 1, 2, 3, and 6 are on. Flying capacitor C F1 / 3 Charging, the voltage at both ends is V IN Flying capacitor C F2 / 4 Discharge, voltage at both ends is 2V IN Inductor L1 is magnetized, and the voltage across it is 3V. IN Voltage V TX The value is 0 at this point.

[0050] In the second operating phase, power transistors 0, 4, 5, and 7 are turned on, while power switches 1, 2, 3, and 6 are turned off. Flying capacitor. Discharge, Charging. Inductor L1 is demagnetized, and the voltage across it is (2V). IN -V R1 V TX At this point, it is V. R1 .

[0051] Assume the duty cycle of the first working phase is D, V TX This will generate a high level of V. R1 A square wave signal with a low level of 0, a frequency of 6.78 MHz, and a duty cycle of (1-D) directly drives the transmitting resonant module, thereby realizing single-stage boost and inversion functions.

[0052] See Figure 4 The performance of the single-stage hybrid boost converter is described below: Figure 4 This section compares the key performance characteristics of the proposed single-stage hybrid boost converter with those of the traditional boost converter, specifically the transfer ratio and the inductor current ratio.

[0053] Based on the volt-second balance of inductor L1, equation (1) can be obtained, and then the expression (2) for the converter's voltage ratio VCR can be obtained.

[0054]

[0055]

[0056] from Figure 4 As can be seen, the single-stage hybrid boost converter achieves a larger transfer ratio, thus enabling higher output voltage, lower emitter current at high output power, reduced emitter resonant circuit losses, and improved system efficiency.

[0057] Furthermore, under the same voltage ratio VCR, the inductor current ratio of the proposed converter is (3), while the inductor current ratio of the traditional Boost converter is (4).

[0058]

[0059]

[0060] Among them, I L I is the average inductor current. O This is the output current.

[0061] from Figure 4 It can be seen that a single-stage hybrid boost converter can achieve a lower inductor current ratio, reduce inductor losses, and improve system efficiency under the same VCR.

[0062] (ii) Control section The control unit includes a soft-start unit, a clock unit, two type-three compensation units, and two drive units. The soft-start unit generates a reference voltage V. REF The clock unit generates two square wave signals V with a frequency of 6.78 MHz and a duty cycle of 0.5. CLK1 and V CLK2 The two signals have a 180-degree phase difference; V REF V CLK1 and the first output voltage V R1 The input is given to the first type III compensation unit, and the output control signal V is generated. PWM1 To the first drive unit, drive power transistor S 0L -S 7L Similarly, V REF V CLK2 and the second output voltage V R2 The input is given to the second and third type compensation units, and the output control signal V is given. PWM2 The second drive unit then drives the power transistor S. 0R -S 7R V PWM1 phase and V CLK1 Consistent, V PWM2 phase and V CLK2 Consistency, i.e., V PWM1 With V PWM2 There is also a 180-degree phase difference.

[0063] See Figure 5 Furthermore, in the traditional type-three compensation circuit, since there is no resistor R4, the voltage V... RC The amplitude is close to the output voltage V R1 Feedback voltage V FB For V R1 The voltage divider's maximum voltage cannot exceed the withstand voltage of resistor R1, which is typically less than 5V. Therefore, the voltage across capacitor C1 is (V R1 -V FB When V R1 When the voltage is too high, the voltage across C1 will far exceed its withstand voltage, causing the capacitor to break down. To ensure chip safety, traditional type-three compensation circuits typically use external capacitors and resistors, increasing circuit cost.

[0064] In the proposed three-type compensation circuit, by adding resistor R4, V RC The voltage is reduced below the chip's withstand voltage, ensuring chip safety and functional stability. Furthermore, V RC With V FB All set to V R1 By increasing the capacitance of C1, the zero-pole distribution of the three-type compensation circuit in this embodiment can be made consistent with that of the traditional compensation circuit, thus ensuring system stability and achieving a fully integrated design.

[0065] See Figure 6 To achieve the above objectives, embodiments of this application also provide a wireless power transmission system, the system including a wireless power receiving circuit and the wireless power transmitting circuit described above.

[0066] like Figure 6 As shown, the receiving resonant circuit is an inductor L. RX With capacitor C RX The series resonance of the circuit has a coupling coefficient of k between the resonant circuits. Diodes D1-D4 form a full-bridge rectifier circuit. V O For the load voltage, C L R is the load capacitance. L This is the load resistance.

[0067] Figure 7 This is a simulation waveform diagram of the key signal, and its input voltage V. IN It is 5V, and the output voltage is V. R1 With V R2 35V, load voltage V O The voltage is 4V, and the system's VCR is set to 35 / 5 = 7, corresponding to a theoretical D value of 0.625. Therefore, V... TX1 With V TX2 The theoretical duty cycle value is 1 - 0.625 = 0.375, and the simulated waveform matches the theoretical value. We can see that V... TX1 With V TX2 Successfully achieved single-stage boost and inverter functions, wirelessly transmitting power to V O And achieve load carrying.

[0068] Figure 8 It is the system efficiency and load power P O For R L The simulation curve, where P O =V O 2 / R L The system efficiency is P O / P IN P IN This is the system input power. When R L When P varies between 10-52Ω, O The range is 6.5-29W, and the system efficiency ranges from 0.76-0.86. Additionally, when R... L It is 20-52Ω, that is, P O When the power is 12-29W, the system efficiency is greater than 0.84, realizing a high-efficiency, high-power wireless power transmission system.

[0069] To achieve the above objectives, embodiments of this application also provide an electronic device, which includes the aforementioned wireless power transmission system.

[0070] It is understood that the content of the above method embodiments is applicable to this device embodiment. The specific functions implemented by this device embodiment are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0071] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0072] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0073] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0074] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0075] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0076] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0077] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0078] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0079] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A wireless power transmission circuit based on a single-stage hybrid boost converter, characterized in that, The circuit includes an LC resonant module, a DC input, a first boost converter module, and a second boost converter module; The DC input is connected to the input terminal of the first boost converter module and the input terminal of the second boost converter module. The output terminal of the first boost converter module is connected to the first terminal of the LC resonant module, and the output terminal of the second boost converter module is connected to the second terminal of the LC resonant module. The first boost converter module and the second boost converter module alternately input AC power at both ends of the LC resonant module to excite the LC resonant module.

2. The circuit as described in claim 1, characterized in that, The first boost converter module and the second boost converter module are single-stage hybrid boost converters; The single-stage hybrid boost converter includes an on-chip power unit and an off-chip unit; The on-chip power unit is provided with several power switches, and the off-chip unit is provided with a first flying capacitor, a second flying capacitor, and a power inductor. Specifically, by controlling the power switch to turn on and off, the first flying capacitor and the second flying capacitor are charged alternately. The power inductor is magnetized when the first flying capacitor is charged and demagnetized when the second flying capacitor is charged.

3. The circuit as described in claim 1, characterized in that, The slew rate of the single-stage hybrid boost converter is: ， in, For the transfer ratio, This is the DC input voltage value. This refers to the discharge voltage value of the single-stage hybrid boost converter. The duty cycle of the control signal for the single-stage hybrid boost converter.

4. The circuit as described in claim 3, characterized in that, Under the same transfer ratio, the inductor current ratio of the single-stage hybrid boost converter is: ， in, The average current of the inductor. This is the output current.

5. The circuit as described in any one of claims 1 to 4, characterized in that, The circuit also includes: A control module is used to control the first boost converter module and the second boost converter module.

6. The circuit as described in claim 5, characterized in that, The control module includes: A soft-start unit is used to generate a reference voltage; A clock unit is used for a first square wave signal and a second square wave signal, wherein the phase difference between the first square wave signal and the second square wave signal is . Spend, Integers greater than or equal to 0; The first type III compensation unit is connected to the soft-start unit and the clock unit, and is used to generate a first control signal according to the reference voltage and the first square wave signal. The second type III compensation unit is connected to the soft-start unit and the clock unit, and is used to generate a second control signal according to the reference voltage and the second square wave signal. The first driving unit has its input end connected to the first type III compensation unit and its output end connected to the first boost converter module, and is used to drive the first boost converter module to turn on or off through the first control signal. The second drive unit has its input end connected to the second type III compensation unit and its output end connected to the second boost converter module. It is used to drive the second boost converter module to turn on or off through the second control signal.

7. The circuit as described in claim 6, characterized in that, The first type III compensation unit and the second type III compensation unit are provided with a voltage divider resistor and a comparator. The voltage divider resistor is located between the power input and the voltage feedback terminal of the comparator.

8. The circuit as described in claim 7, characterized in that, Both the voltage divider resistor and the voltage feedback terminal of the comparator are set to 1 / 10 of the voltage divider value of the power supply input.

9. A wireless power transfer system, characterized in that, The system includes a wireless power receiving circuit and a wireless power transmitting circuit as described in any one of claims 1 to 8.

10. An electronic device, characterized in that, The system is equipped with the wireless power transmission system as described in claim 9, the wireless power transmission system being used for charging.

Images