Power supply regulation circuit, power supply regulation method and electronic equipment

Abstract

The present application discloses a power supply regulation circuit, a power supply regulation method and an electronic device, wherein the control circuit in the power supply regulation circuit adjusts the signal frequency of the set control signal; the three-phase main power circuit converts the first DC signal into the first AC signal in response to the set control signal, and adjusts the waveform frequency of the first AC signal based on the signal frequency; the three-phase resonant circuit adjusts the first AC signal into a resonant current signal in response to the waveform frequency; the three-phase current sampling circuit obtains the resonant current signal in the three-phase resonant circuit, and converts the resonant current signal into a sampled voltage signal; the voltage comparison circuit compares the sampled voltage signal with the set reference voltage to obtain a comparison output signal; the control circuit sends or stops sending the set control signal to the three-phase main power circuit based on the level state of the comparison output signal. Through the above method, the power supply regulation circuit of the present application can fully and effectively realize overcurrent protection to improve the stability and reliability of power supply.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a power supply regulation circuit, a power supply regulation method and an electronic device. Background Art

[0002] Nowadays, with the vigorous development of various mechanical and electronic products, how to charge the power supply in various mechanical and electronic products, especially the batteries in electric vehicles or electric robots, is becoming an important research topic. At present, electric vehicles or electric robots on the market generally use DC charging piles to charge their batteries.

[0003] However, existing DC charging piles usually lack the necessary overcurrent protection or the overcurrent protection is incomplete, resulting in a greater risk of power device loss and low power supply stability and reliability. Summary of the invention

[0004] The main technical problem solved by the present application is to provide a power regulation circuit, a power regulation method and an electronic device, which can solve the problem that the power regulation circuit in the prior art lacks necessary overcurrent protection or the overcurrent protection is incomplete, resulting in a greater risk of power device loss and low power supply stability and reliability.

[0005] In order to solve the above technical problems, a technical solution adopted by the present application is: to provide a power supply regulation circuit, wherein the power supply regulation circuit includes: a three-phase main power circuit, which is used to couple with a DC power supply to receive a first DC signal sent by the DC power supply; a three-phase resonant circuit, which is coupled to the three-phase main power circuit; a control circuit, which is coupled to the three-phase main power circuit, and the control circuit is used to adjust the signal frequency of the set control signal sent to the three-phase main power circuit; wherein the three-phase main power circuit is used to receive the set control signal sent by the control circuit, so as to convert the first DC signal into a first AC signal in response to the set control signal, and adjust the waveform frequency of the first AC signal based on the signal frequency; the three-phase resonant circuit receives the set control signal sent by the three-phase main power circuit The first AC signal sent by the three-phase resonant circuit is adjusted to a resonant current signal in response to the waveform frequency; a three-phase current sampling circuit is coupled to the three-phase resonant circuit to sample and obtain the resonant current signal in the three-phase resonant circuit, and convert the resonant current signal into a sampled voltage signal; a voltage comparison circuit is coupled to the three-phase current sampling circuit and the control circuit to receive the sampled voltage signal sent by the three-phase current sampling circuit, and compare the sampled voltage signal with a set reference voltage to obtain a comparison output signal; wherein the control circuit is also used to receive the comparison output signal sent by the voltage comparison circuit, and send a set control signal to the three-phase main power circuit based on the level state of the comparison output signal, or stop sending the set control signal to the three-phase main power circuit.

[0006] Among them, the three-phase current sampling circuit includes a three-phase current transformer and a three-phase rectifier circuit, the three-phase current transformer is coupled to the three-phase resonant circuit and the three-phase rectifier circuit, and the three-phase rectifier circuit is coupled to the voltage comparison circuit; wherein the three-phase current transformer is used to sample and obtain the resonant current signal in the three-phase resonant circuit, and convert the resonant current signal into a sampling current signal to be sent to the three-phase rectifier circuit, so that the three-phase rectifier circuit converts the sampling current signal into a sampling voltage signal.

[0007] Among them, the three-phase rectifier circuit includes a full-bridge switch subcircuit and a filter output subcircuit, the full-bridge switch subcircuit is coupled to the three-phase current transformer and the filter output subcircuit, and the filter output subcircuit is coupled to the voltage comparison circuit; wherein the full-bridge switch subcircuit is used to receive the sampled current signal sent by the three-phase current transformer and convert the sampled current signal into a second DC signal; the filter output subcircuit receives the second DC signal sent by the full-bridge switch subcircuit and converts the second DC signal into a sampled voltage signal.

[0008] Among them, the three-phase current transformer includes an A-phase current transformer, a B-phase current transformer and a C-phase current transformer, the A-phase current transformer includes a primary A-phase winding and a secondary A-phase winding, the B-phase current transformer includes a primary B-phase winding and a secondary B-phase winding, the C-phase current transformer includes a primary C-phase winding and a secondary C-phase winding, the full-bridge switch subcircuit includes a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube and a sixth switch tube, and the filter output subcircuit includes a first filter capacitor and a filter resistor; wherein the first end and the second end of the primary A-phase winding are respectively coupled to the first end and the second end of the three-phase resonant circuit, and are coupled to the secondary A-phase winding, the first end of the secondary A-phase winding is coupled to the first end of the first switch tube and the second end of the fourth switch tube, the first end and the second end of the primary B-phase winding are respectively coupled to the three-phase resonant circuit The third and fourth ends of the circuit are coupled to the secondary B-phase winding, the first end of the secondary B-phase winding is coupled to the first end of the second switch tube and the second end of the fifth switch tube, the first end and the second end of the primary C-phase winding are respectively coupled to the fifth end and the sixth end of the three-phase resonant circuit, and are coupled to the secondary C-phase winding, the first end of the secondary C-phase winding is coupled to the first end of the first switch tube and the second end of the fourth switch tube, the second end of the secondary A-phase winding is coupled to the second end of the secondary B-phase winding, the second end of the secondary C-phase winding, the first end of the fourth switch tube, the first end of the fifth switch tube, the first end of the sixth switch tube, the second end of the filter resistor and the second end of the first filter capacitor and is grounded, the second end of the first switch tube is coupled to the second end of the second switch tube, the second end of the third switch tube, the first end of the filter resistor, the first end of the first filter capacitor and the voltage comparison circuit.

[0009] Among them, the filter output subcircuit also includes a second filter capacitor, a first end of the second filter capacitor is coupled to the second end of the secondary A phase winding, the second end of the secondary B phase winding and the second end of the secondary C phase winding, and a second end of the second filter capacitor is coupled to the first end of the fourth switch tube, the first end of the fifth switch tube, the first end of the sixth switch tube, the second end of the filter resistor and the second end of the first filter capacitor and is grounded.

[0010] The filter resistor includes at least two resistor unit groups connected in series, and each resistor unit group includes at least two resistor elements connected in parallel.

[0011] Wherein, the voltage comparison circuit includes a voltage comparator, a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor; wherein, a first end of the first resistor is coupled to a second end of the first switch tube, a second end of the second switch tube, a second end of the third switch tube, a first end of the filter resistor and a first end of the first filter capacitor, a second end of the first resistor is coupled to a first end of the first capacitor, a first end of the second resistor and a first end of the third resistor, a second end of the first capacitor is grounded, and a second end of the second resistor is coupled to a first end of the second capacitor and a negative input of the voltage comparator. The first terminal of the fourth resistor is coupled to the first level providing terminal, the second terminal of the fourth resistor is coupled to the second terminal of the second capacitor, the positive input terminal of the voltage comparator, the first terminal of the fifth resistor and the first terminal of the sixth resistor, the second terminal of the fifth resistor is grounded, the second terminal of the sixth resistor is coupled to the output terminal of the voltage comparator, the first terminal of the seventh resistor and the first terminal of the eighth resistor, the power supply terminal of the voltage comparator is coupled to the second level providing terminal, the ground terminal of the voltage comparator is grounded, the second terminal of the seventh resistor is coupled to the third level providing terminal, the second terminal of the eighth resistor is coupled to the first terminal of the third capacitor and the control circuit, and the second terminal of the third capacitor is grounded.

[0012] Wherein, the three-phase main power circuit includes an input capacitor, a first power switch tube, a second power switch tube, a third power switch tube, a fourth power switch tube, a fifth power switch tube and a sixth power switch tube, and the three-phase resonant circuit includes a first resonant capacitor, a first resonant inductor, a second resonant capacitor, a second resonant inductor, a third resonant capacitor and a third resonant inductor; wherein, the first end of the input capacitor is coupled to the first end of the first power switch tube, the first end of the second power switch tube and the first end of the third power switch tube, and is used to couple with the first end of the DC power supply, the second end of the input capacitor is coupled to the second end of the fourth power switch tube, the second end of the fifth power switch tube and the second end of the sixth power switch tube, and is used to couple with the second end of the DC power supply, the first power switch The second end of the tube is coupled to the first end of the fourth power switch tube and the first end of the first resonant capacitor, the second end of the second power switch tube is coupled to the first end of the fifth power switch tube and the first end of the second resonant capacitor, the second end of the third power switch tube is coupled to the first end of the sixth power switch tube and the first end of the third resonant capacitor, the second end of the first resonant capacitor is coupled to the first end of the three-phase current sampling circuit, the second end of the three-phase current sampling circuit is coupled to the first end of the first resonant inductor, the second end of the second resonant capacitor is coupled to the third end of the three-phase current sampling circuit, the fourth end of the three-phase current sampling circuit is coupled to the first end of the second resonant inductor, the second end of the third resonant capacitor is coupled to the fifth end of the three-phase current sampling circuit, and the sixth end of the three-phase current sampling circuit is coupled to the first end of the third resonant inductor.

[0013] Among them, the power supply regulation circuit also includes a three-phase isolation transformer and a Y-type three-phase rectifier circuit. The three-phase isolation transformer includes an A-phase primary winding, a B-phase primary winding, a C-phase primary winding, an A-phase secondary winding, a B-phase secondary winding and a C-phase secondary winding; wherein the second end of the first resonant inductor is coupled to the first end of the A-phase primary winding, the second end of the second resonant inductor is coupled to the first end of the B-phase primary winding, the second end of the third resonant inductor is coupled to the first end of the C-phase primary winding, the second end of the A-phase primary winding is coupled to the second end of the B-phase primary winding and the second end of the C-phase primary winding, the A-phase primary winding is coupled to the A-phase secondary winding, the B-phase primary winding is coupled to the B-phase secondary winding, and the C-phase primary winding is coupled to the C-phase secondary winding.

[0014] To solve the above technical problems, another technical solution adopted in the present application is: to provide a power supply regulation method, wherein the power supply regulation method includes: receiving a first DC signal sent by an external DC power supply; converting the first DC signal into a first AC signal using a set control signal; adjusting the signal frequency of the set control signal to adjust the waveform frequency of the first AC signal based on the signal frequency; adjusting the first AC signal to a resonant current signal based on the waveform frequency; converting the resonant current signal into a sampled voltage signal; comparing the sampled voltage signal with a set reference voltage to obtain a comparison output signal; converting the first DC signal into a first AC signal based on the level state of the comparison output signal, or stopping converting the first DC signal into the first AC signal.

[0015] The step of converting the resonant current signal into a sampling voltage signal includes: converting the resonant current signal into a sampling current signal; and converting the sampling current signal into a sampling voltage signal.

[0016] To solve the above technical problems, another technical solution adopted in the present application is: to provide an electronic device, wherein the electronic device includes a shell and a power regulation circuit connected to the shell; wherein the power regulation circuit is a power regulation circuit as described in any of the above items.

[0017] The beneficial effects of the present application are as follows: different from the prior art, the control circuit in the power supply regulation circuit provided by the present application is used to adjust the signal frequency of the set control signal; the three-phase main power circuit is used to receive the first DC signal sent by the DC power supply, and convert the first DC signal into a first AC signal in response to the set control signal, and adjust the waveform frequency of the first AC signal based on the signal frequency; the three-phase resonant circuit adjusts the first AC signal to a resonant current signal in response to the waveform frequency; the three-phase current sampling circuit samples and obtains the resonant current signal in the three-phase resonant circuit, and converts the resonant current signal into a sampled voltage signal; the voltage comparison circuit compares the sampled voltage signal with the set reference voltage to obtain a comparison output signal; the control circuit is also used to send a set control signal to the three-phase main power circuit based on the level state of the comparison output signal, or stop sending the set control signal to the three-phase main power circuit, so that overcurrent protection can be fully and effectively implemented for the three-phase main power circuit and the post-circuit through sampling and feedback control of the resonant current signal, so as to effectively improve the power supply stability and reliability of the power supply regulation circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0019] Figure 1 It is a structural schematic diagram of the first embodiment of the power supply regulation circuit of the present application;

[0020] Figure 2 It is a structural schematic diagram of a second embodiment of the power supply regulating circuit of the present application;

[0021] Figure 3 It is a structural schematic diagram of a third embodiment of the power supply regulating circuit of the present application;

[0022] Figure 4 It is a flowchart of an implementation method of the power supply regulation method of the present application;

[0023] Figure 5 yes Figure 4 A schematic diagram of the process of an embodiment of S45;

[0024] Figure 6 It is a schematic diagram of the framework of an implementation scheme of the electronic device of the present application. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] The terms "first", "second" and "third" in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second" and "third" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. All directional indications (such as up, down, left, right, front, back...) in the implementation mode of this application are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0027] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] The present application is described in detail below with reference to the accompanying drawings and implementation methods.

[0029] See also Figure 1 , Figure 1 The schematic diagram is a schematic diagram of the structure of the first embodiment of the power supply regulation circuit of the present application. In this embodiment, the power supply regulation circuit 10 includes: a three-phase main power circuit 11, a three-phase resonant circuit 12, a control circuit 13, a three-phase current sampling circuit 14 and a voltage comparison circuit 15.

[0030] Specifically, the three-phase main power circuit 11 is used to couple with the DC power supply 101 , that is, to achieve physical and electrical connection with the external DC power supply 101 to receive a first DC signal with a constant current and / or voltage provided by the DC power supply 101 .

[0031] It is worth noting that the DC power supply 101 can be specifically understood as a battery with a DC output, a DC voltage regulator or any other DC power source, or a DC power supply output obtained after power conversion and regulation of the grid power supply, photovoltaic power supply, independent generator or any other reasonable upper power supply source.

[0032] In addition, the term "coupled" herein refers to any direct and indirect connection means. Therefore, if the first circuit is described as being coupled to the second circuit, it means that the first circuit can be directly connected to the second circuit through electrical connection or signal connection methods such as wireless transmission, optical transmission, etc., or can be indirectly connected to the second circuit through other circuits or connection means.

[0033] Among them, the three-phase main power circuit 11 is also coupled to the control circuit 13 to receive the setting control signal sent by the control circuit 13, and utilizes its internal switching action mechanism, such as the opening and closing action mechanism of switching devices such as IGBT (Insulated Gate Bipolar Transistor), high-frequency transistor, MOS (Metal Oxide Semiconductor Field Effect Transistor), etc. Under the action of the setting control signal, the DC power is quickly switched to generate an alternating voltage waveform to obtain a first AC signal.

[0034] It should be noted that, since it is a three-phase power supply system, the three-phase main power circuit 11 actually outputs a three-phase AC signal.

[0035] Optionally, the set control signal can specifically be one or more of any reasonable control signals such as a PWM (Pulse Width Modulation) signal or a PFM (Pulse Frequency Modulation) signal, and is preferably a PFM signal with a duty cycle of 50%, which is not limited in the present application.

[0036] The three-phase resonant circuit 12 is coupled to the three-phase main power circuit 11, and its function is to receive the first AC signal sent by the three-phase main power circuit 11, and make its internal capacitors and inductors reach a resonant state at a specific frequency of the first AC signal, thereby improving the quality of the output signal and reducing harmonic distortion.

[0037] Specifically, the control circuit 13 is also used to adjust the signal frequency of the set control signal sent to the three-phase main power circuit 11, so that when the set control signal is sent to the three-phase main power circuit 11, the signal frequency of the set control signal can be used to adjust the switching state of the three-phase main power circuit 11, thereby adjusting the waveform frequency of the first AC signal corresponding to the output of the three-phase main power circuit 11.

[0038] Optionally, the control circuit 13 may specifically include a DSP (Digital Signal Process) chip, a control chip, an MCU (Micro Controller Unit) circuit, a CPU (Central Processing Unit), a single-chip microcomputer, a field programmable gate array, a programmable logic device, a discrete gate or transistor logic device, discrete hardware, and any other reasonable circuit unit with a signal processing function, and the present application does not limit this.

[0039] Furthermore, when the three-phase resonant circuit 12 receives the first AC signal sent by the three-phase main power circuit 11, it can also adjust the first AC signal into a resonant current signal in response to the waveform frequency of the first AC signal being a specific frequency that causes its internal capacitance and inductance to reach a resonant state.

[0040] It can be seen that the control circuit 13 specifically adjusts the signal frequency of the set control signal sent to the three-phase main power circuit 11, thereby adjusting the waveform frequency of the first AC signal output by the three-phase main power circuit 11 to the three-phase resonant circuit 12, until the three-phase resonant circuit 12 reaches a resonant state, and adjusts the first AC signal to a resonant current signal.

[0041] The three-phase current sampling circuit 14 is coupled to the three-phase resonant circuit 12 to sample and obtain a resonant current signal from the three-phase resonant circuit 12 and convert the resonant current signal into a sampling voltage signal for subsequent circuit processing.

[0042] Optionally, the three-phase current sampling circuit 14 can specifically use one or more of any reasonable circuit elements such as current transformers, Hall effect sensors or shunt resistors to implement current sampling and complete the conversion of current to voltage, which is not limited in the present application.

[0043] Furthermore, the voltage comparison circuit 15 is coupled to the three-phase current sampling circuit 14 and the control circuit 13 to receive the sampling voltage signal sent by the three-phase current sampling circuit 14 and compare the sampling voltage signal with the set reference voltage to generate a corresponding comparison output signal.

[0044] Optionally, the voltage comparison circuit 15 can specifically use one or more of any reasonable circuit elements such as an operational amplifier or a dedicated comparator chip to implement voltage comparison, such as outputting a comparison output signal of a first level when the sampled voltage signal is higher than a set reference voltage, and outputting a comparison output signal of a second level when the sampled voltage signal is lower than the set reference voltage. The present application does not limit this.

[0045] Furthermore, the control circuit 13 is also used to receive the comparison output signal sent by the voltage comparison circuit 15, so as to decide whether to send a setting control signal to the three-phase main power circuit 11 according to the level state of the comparison output signal, for example, when the comparison output signal is at a first level, the setting control signal is sent to the three-phase main power circuit 11, and when the comparison output signal is at a second level, the setting control signal is stopped from being sent to the three-phase main power circuit 11.

[0046] Optionally, the first level is a high level, and the second level is a low level or a 0 level; or, the first level is a low level or a 0 level, and the second level is a high level, which is not limited in the present application.

[0047] It is understandable that the control circuit 13 starts or shuts down certain switching devices in the three-phase main power circuit 11 based on the level state output by the voltage comparison circuit 15, so as to send a set control signal to the three-phase main power circuit 11 or stop sending the set control signal to adjust the working state of the three-phase main power circuit 11.

[0048] Among them, when the resonant current signal in the three-phase resonant circuit 12 is in an overcurrent state, it will be sampled by the three-phase current sampling circuit 14, converted into a sampling voltage signal, and sent to the voltage comparison circuit 15, so that the voltage comparison circuit 15 compares it with the set reference voltage to obtain a comparison output signal of the second level, so that the control circuit 13 stops sending the set control signal to the three-phase main power circuit 11, that is, the three-phase main power circuit 11 is blocked and the drive is blocked. The three-phase main power circuit 11 will stop outputting the first AC signal to the three-phase resonant circuit 12, thereby suppressing the overcurrent of the resonant current signal, and can also timely suppress the loss of the circuit caused by the overcurrent.

[0049] When the resonant current signal in the three-phase resonant circuit 12 is in a normal state, the comparison output signal obtained by the voltage comparison circuit 15 comparing it with the set reference voltage will be at the first level, and the control circuit 13 will normally send the set control signal to the three-phase main power circuit 11.

[0050] It can be seen that the size of the sampled voltage signal corresponding to the set reference voltage limits a set threshold range, and the size of the sampled voltage signal corresponds to the size of the resonant current signal, or the sampled voltage signal is positively correlated with the resonant current signal. The set reference voltage can be set specifically according to the threshold range of whether the resonant current signal is overcurrent, so that when the resonant current signal is overcurrent, the control circuit 13 can promptly seal the three-phase main power circuit 11 to avoid loss to the circuit.

[0051] The above scheme, through sampling and feedback control of the resonant current signal, can comprehensively and effectively implement overcurrent protection for the three-phase main power circuit 11 and the post-circuit, so as to effectively improve the power supply stability and reliability of the power supply regulation circuit 10.

[0052] See also Figure 2 , Figure 2 The power supply regulation circuit in this embodiment is different from the first embodiment of the power supply regulation circuit provided in this application in that the three-phase current sampling circuit 24 in the power supply regulation circuit 20 further includes a three-phase current transformer 241 and a three-phase rectifier circuit 242.

[0053] Specifically, the three-phase current transformer 241 is coupled to the three-phase resonant circuit 22 and the three-phase rectifying circuit 242 , and the three-phase rectifying circuit 242 is coupled to the voltage comparison circuit 25 .

[0054] Among them, the three-phase current transformer 241 is used to sample and obtain the resonant current signal in the three-phase resonant circuit 22, so as to convert the resonant current signal into a sampling current signal of a suitable size for subsequent circuit processing, and after providing safety electrical isolation and voltage matching, it is output to the three-phase rectifier circuit 242, so that the three-phase rectifier circuit 242 uses the sampling current signal to convert it into a sampling voltage signal.

[0055] In one embodiment, the three-phase rectifier circuit 242 further includes a full-bridge switch sub-circuit 2421 and a filter output sub-circuit 2422 . The full-bridge switch sub-circuit 2421 is coupled to the three-phase current transformer 241 and the filter output sub-circuit 2422 . The filter output sub-circuit 2422 is coupled to the voltage comparison circuit 25 .

[0056] Among them, the full-bridge switch subcircuit 2421 is used to receive the sampling current signal sent by the three-phase current transformer 241. The full-bridge switch subcircuit 2421 usually includes four switching elements, which are switched in a certain order to convert the AC current signal into a DC signal, that is, to convert the sampling current signal into a second DC signal.

[0057] The filter output subcircuit 2422 receives the second DC signal sent by the full-bridge switch subcircuit 2421, and converts the second DC signal into a sampled voltage signal through filtering and conversion processes. The filtering process generally includes using a filter circuit composed of capacitors and / or inductors and / or resistors to reduce the ripple in the DC signal and improve the purity of the signal. And the conversion process may involve using a resistor or a voltage conversion circuit to convert the DC current signal into a voltage signal proportional to it.

[0058] In one embodiment, the power regulation circuit 20 specifically also includes a three-phase isolation transformer 26, a Y-type three-phase rectifier circuit 27 and a capacitor circuit 28. The three-phase isolation transformer 26 couples the three-phase resonant circuit 22 and the Y-type three-phase rectifier circuit 27. The Y-type three-phase rectifier circuit 27 couples the capacitor circuit 28 and is used to couple with the load circuit 102.

[0059] Among them, the three-phase isolation transformer 26 is used to receive the resonant current signal sent by the three-phase resonant circuit 22, and to utilize the coupling of the primary and secondary windings of the three-phase isolation transformer 26 to convert the resonant current signal into a second AC signal, which is used to achieve primary and secondary side safety electrical isolation and voltage matching, meet the primary and secondary side electrical safety insulation requirements, and transform the voltage according to the required voltage level.

[0060] The Y-type three-phase rectifier circuit 27 is used to receive the second AC signal from the three-phase isolation transformer 26, and use high-frequency rectification technology, such as PWM, synchronous rectification, reverse damping rectification, or any other reasonable rectification method, to convert the second AC signal into a stable DC output, which is then output to the load circuit 102 to meet the power usage of the load circuit 102.

[0061] It is worth noting that the Y-type three-phase rectifier circuit 27 refers to a Y-type connection, that is, it is composed of three bridge arms of switching devices, and each bridge arm is connected to a winding of the three-phase isolation transformer 26.

[0062] The Y-connection, also known as the star connection, is a basic wiring method in power engineering. In a three-phase power system, the Y-connection is to connect one end of each phase power supply or load together to form a common point, usually called the midpoint or zero point, and represented by the letter O. This midpoint is sometimes connected to the earth, so that the neutral line is also called the ground line. The wire leading out from this point is called the neutral line or zero line, and the wire leading out from the beginning of the three-phase power supply winding is called the phase line or live line. The characteristic of this wiring method is that the end of each phase is connected together to form a neutral point, and the beginning of each phase is used as the output end of the power supply.

[0063] Optionally, the load circuit 102 may specifically be a rechargeable battery in any reasonable electronic device such as an electric car, a large unmanned aerial vehicle or an electric robot, and this application does not limit this.

[0064] Further, the capacitor circuit 28 can be specifically coupled between the Y-type connection midpoint of the Y-type three-phase rectifier circuit 27 and the ground terminal to filter and smooth the DC output and reduce the ripple voltage. In the Y-type connection, the capacitor circuit 28 is connected between the neutral point and the ground to stabilize the DC output voltage. By selecting a suitable capacitance value, it can be ensured that the output voltage remains within a stable range, that is, the output voltage of the second DC signal is limited within the first threshold range to meet the power requirements of the load circuit 102.

[0065] It is worth noting that the first threshold range is a reasonable voltage and / or current and / or frequency range given to meet the driving characteristic requirements of the load circuit 102, such as the charging requirements of electric vehicle batteries, and also to maintain system energy efficiency and stability.

[0066] In addition, the ground terminal can be specifically understood as a control ground, or an output ground of the load circuit 102 .

[0067] It is understandable that, in this embodiment, the three-phase main power circuit 21, the three-phase resonant circuit 22, the control circuit 23 and the voltage comparison circuit 25 are respectively the same as the three-phase main power circuit 11, the three-phase resonant circuit 12, the control circuit 13 and the voltage comparison circuit 15. For details, please refer to Figure 1 And the related text content will not be repeated here.

[0068] See also Figure 3 , Figure 3 It is a structural diagram of the third embodiment of the power regulation circuit of the present application. The power regulation circuit in this embodiment is based on the second embodiment of the power regulation circuit provided in the present application, and the three-phase current transformer 341 in the three-phase current sampling circuit 34 of the power regulation circuit 30 further includes an A-phase current transformer T1, a B-phase current transformer T2, and a C-phase current transformer T3.

[0069] Specifically, the three-phase current transformer 341 includes an A-phase current transformer T1, a B-phase current transformer T2 and a C-phase current transformer T3. The A-phase current transformer T1 includes a primary A-phase winding N1 and a secondary A-phase winding N2. The B-phase current transformer T2 includes a primary B-phase winding N3 and a secondary B-phase winding N4. The C-phase current transformer T3 includes a primary C-phase winding N5 and a secondary C-phase winding N6. The full-bridge switch sub-circuit 2421 includes a first switch tube D1, a second switch tube D2, a third switch tube D3, a fourth switch tube D4, a fifth switch tube D5 and a sixth switch tube D6. The filter output sub-circuit 3422 includes a first filter capacitor cl1 and a filter resistor R.

[0070] Among them, the first end and the second end of the primary A phase winding N1 are respectively coupled to the first end and the second end of the three-phase resonant circuit 32, and are coupled to the secondary A phase winding N2. The first end of the secondary A phase winding N2 is coupled to the first end of the first switch tube D1 and the second end of the fourth switch tube D4. The first end and the second end of the primary B phase winding N3 are respectively coupled to the third end and the fourth end of the three-phase resonant circuit 32, and are coupled to the secondary B phase winding N4. The first end of the secondary B phase winding N4 is coupled to the first end of the second switch tube D2 and the second end of the fifth switch tube D5. The first end and the second end of the primary C phase winding N5 are respectively coupled to the fifth end and the sixth end of the three-phase resonant circuit 32, and are coupled to the secondary The C-phase winding N6 is coupled, the first end of the secondary C-phase winding N6 is coupled to the first end of the first switch tube D1 and the second end of the fourth switch tube D4, the second end of the secondary A-phase winding N2 is coupled to the second end of the secondary B-phase winding N4, the second end of the secondary C-phase winding N6, the first end of the fourth switch tube D4, the first end of the fifth switch tube D5, the first end of the sixth switch tube D6, the second end of the filter resistor R and the second end of the first filter capacitor cl1 and are grounded, the second end of the first switch tube D1 is coupled to the second end of the second switch tube D2, the second end of the third switch tube D3, the first end of the filter resistor R, the first end of the first filter capacitor cl1 and the voltage comparison circuit 35.

[0071] Optionally, the first switch tube D1, the second switch tube D2, the third switch tube D3, the fourth switch tube D4, the fifth switch tube D5 and the sixth switch tube D6 can be specifically diodes, or can be one or more combinations of any reasonable switching devices such as MOS tubes, high-frequency transistors, triodes, thyristors, IGBTs, etc., and the present application does not limit this.

[0072] When the above-mentioned switching tubes are one or more combinations of any reasonable switching devices such as MOS tubes, high-frequency transistors, triodes, thyristors, IGBTs, etc., the third end of each switching tube corresponds to the control end and is coupled to the control circuit (not shown) to receive the corresponding driving signal sent by the control circuit, and trigger the first end and the second end to be turned on or off under the action of the driving signal to convert the second AC signal into a second DC signal and output it to the load circuit 102.

[0073] Furthermore, in one embodiment, the filter output subcircuit 3422 specifically also includes a second filter capacitor cl2, a first end of the second filter capacitor cl2 is coupled to the second end of the secondary A phase winding N2, the second end of the secondary B phase winding N4 and the second end of the secondary C phase winding N6, a second end of the second filter capacitor cl2 is coupled to the first end of the fourth switch tube D4, the first end of the fifth switch tube D5, the first end of the sixth switch tube D6, the second end of the filter resistor R and the second end of the first filter capacitor cl1 and is grounded, so that the second filter capacitor cl2 can be used to filter the sampled current signal obtained by sampling the three-phase current transformer 341 to reduce the influence of ripple voltage on sampling.

[0074] In one embodiment, the filter resistor R specifically includes at least two resistor unit groups connected in series, and each of the resistor unit groups includes at least two resistor elements connected in parallel.

[0075] It is understandable that the filter resistor R is actually equivalent to a large resistor, but when the large resistor is implemented by using several resistor elements in series and parallel, the withstand voltage requirement of each resistor element can be effectively reduced, and it can be implemented using commonly used small resistors with standard resistance values. Compared with large resistors with non-standard resistance values, it will have obvious advantages in manufacturing cost and occupied volume, and the performance requirements for each small resistance value are also lower.

[0076] In one embodiment, the voltage comparison circuit 35 further includes a voltage comparator U1A, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8.

[0077] Wherein, the first end of the first resistor R1 is coupled to the second end of the first switch tube D1, the second end of the second switch tube D2, the second end of the third switch tube D3, the first end of the filter resistor R, and the first end of the first filter capacitor cl1; the second end of the first resistor R1 is coupled to the first end of the first capacitor C1, the first end of the second resistor R2, and the first end of the third resistor R3; the second end of the first capacitor C1 is grounded; the second end of the second resistor R2 is coupled to the first end of the second capacitor C2 and the negative input end of the voltage comparator U1A; the second end of the third resistor R3 is coupled to the first end of the fourth resistor R4 and the first level providing end SR3V; the second end of the fourth resistor R4 is coupled to the The second end of the second capacitor C2, the positive input end of the voltage comparator U1A, the first end of the fifth resistor R5 and the first end of the sixth resistor R6 are connected. The second end of the fifth resistor R5 is grounded. The second end of the sixth resistor R6 is coupled to the output end of the voltage comparator U1A, the first end of the seventh resistor R7, and the first end of the eighth resistor R8. The power supply end of the voltage comparator U1A is coupled to the second level providing end +5VS1, the ground end of the voltage comparator U1A is grounded, the second end of the seventh resistor R7 is coupled to the third level providing end VS3.3D, the second end of the eighth resistor R8 is coupled to the first end of the third capacitor C3 and the control circuit, and the second end of the third capacitor C3 is grounded.

[0078] Among them, the first level providing terminal SR3V can be understood as an external reference voltage, which generates a set reference voltage of the voltage comparator U1A after being divided by the fourth resistor R4 and the fifth resistor R5; and the sampling voltage signal will be input into the voltage comparator U1A through the first resistor R1 and the second resistor R2 to be compared with the set reference voltage; when the power supply regulation circuit works normally, the voltage comparator U1A will output a high level; when the sampling voltage signal is greater than the reference voltage, the voltage comparator U1A will output a low level to send to the control circuit. After detecting the low level, the control circuit turns off the drive signal, thereby realizing wave sealing to protect the switching devices in the power supply regulation circuit.

[0079] In one embodiment, the three-phase main power circuit 31 specifically further includes an input capacitor Cs1, a first power switch tube Q1, a second power switch tube Q2, a third power switch tube Q3, a fourth power switch tube Q4, a fifth power switch tube Q5 and a sixth power switch tube Q6, and the three-phase resonant circuit 32 includes a first resonant capacitor Cr1, a first resonant inductor Lr1, a second resonant capacitor Cr2, a second resonant inductor Lr2, a third resonant capacitor Cr3, and a third resonant inductor Lr3.

[0080] Wherein, the first end of the input capacitor Cs1 is coupled to the first end of the first power switch tube Q1, the first end of the second power switch tube Q2 and the first end of the third power switch tube Q3, and is used to couple with the first end of the DC power supply 101, the second end of the input capacitor Cs1 is coupled to the second end of the fourth power switch tube Q4, the second end of the fifth power switch tube Q5 and the second end of the sixth power switch tube Q6, and is used to couple with the second end of the DC power supply 101, the second end of the first power switch tube Q1 is coupled to the first end of the fourth power switch tube Q4 and the first end of the first resonant capacitor Cr1, the second end of the second power switch tube Q2 is coupled to the first end of the fifth power switch tube Q5 and the second resonant capacitor Cr1, The first end of the capacitor Cr2, the second end of the third power switch tube Q3 is coupled to the first end of the sixth power switch tube Q6 and the first end of the third resonant capacitor Cr3, the second end of the first resonant capacitor Cr1 is coupled to the first end of the three-phase current sampling circuit 34, the second end of the three-phase current sampling circuit 34 is coupled to the first end of the first resonant inductor Lr1, the second end of the second resonant capacitor Cr2 is coupled to the third end of the three-phase current sampling circuit 34, the fourth end of the three-phase current sampling circuit 34 is coupled to the first end of the second resonant inductor Lr2, the second end of the third resonant capacitor Cr3 is coupled to the fifth end of the three-phase current sampling circuit 34, and the sixth end of the three-phase current sampling circuit 34 is coupled to the first end of the third resonant inductor Lr3.

[0081] Optionally, the first power switch tube Q1, the second power switch tube Q2, the third power switch tube Q3, the fourth power switch tube Q4, the fifth power switch tube Q5 and the sixth power switch tube Q6 can specifically be one or more combinations of any reasonable switching devices such as MOS tubes, high-frequency transistors, triodes, thyristors, IGBTs, etc., and the present application does not limit this.

[0082] And the third end of each power switch tube in this article corresponds to the control end, which is correspondingly coupled to the control circuit to receive the setting control signal sent by the control circuit. The setting control signal can specifically include the first drive signal PWM-A1, the second drive signal PWM-B1, the third drive signal PWM-C1, the fourth drive signal PWM-A2, the fifth drive signal PWM-B2 and the sixth drive signal PWM-C2, which are respectively output to the first power switch tube Q1, the second power switch tube Q2, the third power switch tube Q3, the fourth power switch tube Q4, the fifth power switch tube Q5 and the sixth power switch tube Q6, and trigger the first end and the second end thereof to be turned on or off, thereby converting the first DC signal into the first AC signal.

[0083] In one embodiment, the power regulation circuit 30 specifically also includes a three-phase isolation transformer 36 and a Y-type three-phase rectifier circuit 37. The three-phase isolation transformer 36 includes an A-phase primary winding NA11, a B-phase primary winding NB22, a C-phase primary winding NC11, an A-phase secondary winding 361, a B-phase secondary winding 362, and a C-phase secondary winding 363.

[0084] Among them, the second end of the first resonant inductor Lr1 is coupled to the first end of the A-phase primary winding NA11, the second end of the second resonant inductor Lr2 is coupled to the first end of the B-phase primary winding NB22, the second end of the third resonant inductor Lr3 is coupled to the first end of the C-phase primary winding NC11, the second end of the A-phase primary winding NA11 is coupled to the second end of the B-phase primary winding NB22 and the second end of the C-phase primary winding NC11, the A-phase primary winding NA11 is coupled to the A-phase secondary winding 361, the B-phase primary winding NB22 is coupled to the B-phase secondary winding 362, and the C-phase primary winding NC11 is coupled to the C-phase secondary winding 363.

[0085] In one embodiment, the power supply regulation circuit 30 specifically further includes a capacitor circuit, which further includes a first capacitor subcircuit (not shown) and a second capacitor subcircuit (not shown), the A-phase secondary winding 361 further includes a first A-phase secondary winding NA1 and a second A-phase secondary winding NA2, the B-phase secondary winding 362 further includes a first B-phase secondary winding NB1 and a second B-phase secondary winding NB2, the C-phase secondary winding 363 further includes a first C-phase secondary winding NC1 and a second C-phase secondary winding NC2, and the Y-type three-phase rectifier circuit 3 Specifically, the first Y-type three-phase rectifier circuit 371 and the second Y-type three-phase rectifier circuit 372 may be included. The first Y-type three-phase rectifier circuit 371 includes a thirteenth switch tube D13, a fourteenth switch tube D14, a fifteenth switch tube D15, a sixteenth switch tube D16, a seventeenth switch tube D17 and an eighteenth switch tube D18. The second Y-type three-phase rectifier circuit 372 includes a thirteenth switch tube D13, a fourteenth switch tube D14, a fifteenth switch tube D15, a sixteenth switch tube D16, a seventeenth switch tube D17 and an eighteenth switch tube D18.

[0086] Among them, the first end of the first A-phase secondary winding NA1 is coupled to the first end of the first B-phase secondary winding NB1 and the first end of the first C-phase secondary winding NC1 to form a first Y-type connection midpoint HN, and is coupled to the first end of the first capacitor sub-circuit, the second end of the first A-phase secondary winding NA1 is coupled to the first end of the thirteenth switch tube D13 and the second end of the sixteenth switch tube D16, the second end of the first B-phase secondary winding NB1 is coupled to the first end of the fourteenth switch tube D14 and the second end of the seventeenth switch tube D17, the second end of the first C-phase secondary winding NC1 is coupled to the first end of the fifteenth switch tube D15 and the second end of the eighteenth switch tube D18, the second end of the thirteenth switch tube D13 is coupled to the second end of the fourteenth switch tube D14 and the second end of the fifteenth switch tube D15 to form a first output terminal Vo1, and the first end of the sixteenth switch tube D16 is coupled to the first end of the seventeenth switch tube D17 and the first end of the eighteenth switch tube D18 to form a second output terminal 1 11; The first end of the second A-phase secondary winding NA2 is coupled to the first end of the second B-phase secondary winding NB2 and the first end of the second C-phase secondary winding NC2 to form a second Y-type connection midpoint LN, and is coupled to the first end of the first capacitor sub-circuit, the second end of the second A-phase secondary winding NA2 is coupled to the first end of the thirteenth switch tube D13 and the second end of the sixteenth switch tube D16, the second end of the second B-phase secondary winding NB2 is coupled to the first end of the fourteenth switch tube D14 and the second end of the seventeenth switch tube D17, the second end of the second C-phase secondary winding NC2 is coupled to the first end of the fifteenth switch tube D15 and the second end of the eighteenth switch tube D18, the second end of the thirteenth switch tube D13 is coupled to the second end of the fourteenth switch tube D14 and the second end of the fifteenth switch tube D15 to form a third output terminal 222, the first end of the sixteenth switch tube D16 is coupled to the first end of the seventeenth switch tube D17 and the first end of the eighteenth switch tube D18 to form a ground terminal DGND.

[0087] The second end of the first capacitor subcircuit and the second end of the first capacitor subcircuit are both coupled to the ground terminal DGND to cooperate with each other to effectively filter out common-mode interference signals that may exist in the first Y-type three-phase rectifier subcircuit 371 and the second Y-type three-phase rectifier subcircuit 372, thereby stabilizing the ground terminal DGND.

[0088] In one embodiment, the first output terminal Vo1 is specifically used to couple with the first end of the load circuit (not shown), and the second output terminal 111 is coupled with the third output terminal 222, and the ground terminal DGND is used to couple with the second end of the load circuit, that is, by connecting the output terminals of the first Y-type three-phase rectifier circuit 371 and the second Y-type three-phase rectifier circuit 372 in series to jointly power the load circuit.

[0089] In another embodiment, the first output terminal Vo1 can also be coupled to the third output terminal 222 and used to couple with the first end of the load circuit, while the second output terminal 111 is coupled to the ground terminal DGND and used to couple with the second end of the load circuit, that is, by connecting the output ends of the first Y-type three-phase rectifier circuit 371 and the second Y-type three-phase rectifier circuit 372 in parallel to jointly power the load circuit.

[0090] Optionally, the thirteenth switch tube D13, the fourteenth switch tube D14, the fifteenth switch tube D15, the sixteenth switch tube D16, the seventeenth switch tube D17, the eighteenth switch tube D18, the thirteenth switch tube D13, the fourteenth switch tube D14, the fifteenth switch tube D15, the sixteenth switch tube D16, the seventeenth switch tube D17 and the eighteenth switch tube D18 can be diodes, or can be one or more combinations of any reasonable switching devices such as MOS tubes, high-frequency transistors, triodes, thyristors, IGBTs, etc., and the present application does not limit this.

[0091] And when the above-mentioned switching tubes are specifically one or more combinations of any reasonable switching devices such as MOS tubes, high-frequency transistors, triodes, thyristors, IGBTs, etc., the third end of each switching tube corresponds to the control end, and is correspondingly coupled to the control circuit (not shown in the figure) to receive the driving signal sent by the control circuit, and trigger the first end and the second end to be turned on or off under the action of the driving signal, so as to convert the second AC signal into a second DC signal and output it to the load circuit.

[0092] In other embodiments, the A-phase secondary winding 361 may specifically include one of a first A-phase secondary winding NA1 and a second A-phase secondary winding NA2, the B-phase secondary winding 362 includes one of a first B-phase secondary winding NB1 and a second B-phase secondary winding NB2, the C-phase secondary winding 363 includes one of a first C-phase secondary winding NC1 and a second C-phase secondary winding NC2, and the Y-type three-phase rectifier circuit 37 may specifically include one of a first Y-type three-phase rectifier circuit 371 and a second Y-type three-phase rectifier circuit 372, which is not limited in the present application.

[0093] This application also specifically adopts a power supply regulation method, see Figure 4 , Figure 4 This is a flow chart of an implementation method of the power supply regulation method of the present application. Specifically, it may include the following steps:

[0094] S41: Receive a first DC signal sent by an external DC power source.

[0095] It is understandable that the power supply regulation method in this embodiment is specifically a method for regulating and controlling various electrical signals during the power supply output process of the power supply regulation circuit using the direct current provided by the external direct current power supply. Among them, the power supply circuit specifically includes a three-phase main power circuit, a three-phase resonant circuit, a control circuit, a three-phase current sampling circuit and a voltage comparison circuit; the three-phase main power circuit is used to couple with the direct current power supply, the three-phase resonant circuit is coupled to the three-phase main power circuit, the control circuit is coupled to the three-phase main power circuit, the three-phase current sampling circuit is coupled to the three-phase resonant circuit, and the voltage comparison circuit is coupled to the three-phase current sampling circuit and the control circuit.

[0096] Specifically, the three-phase main power circuit is used to receive a first DC signal provided by an external DC power supply.

[0097] It is worth noting that the DC power supply can be specifically understood as a battery with a DC output, a DC voltage regulator or any other DC power source, or a DC power supply output obtained after power conversion and regulation of the grid power supply, photovoltaic power supply, independent generator or any other reasonable superior power supply source.

[0098] S42: Convert the first DC signal into a first AC signal using the set control signal.

[0099] The three-phase main power circuit is also used to receive a set control signal sent by the control circuit, and utilize its internal switching action mechanism, such as the opening and closing action mechanism of switching devices such as IGBT, high-frequency transistor, MOS, etc., to quickly switch the DC power under the action of the set control signal to generate an alternating voltage waveform to obtain a first AC signal.

[0100] S43: adjusting the signal frequency of the setting control signal to adjust the waveform frequency of the first AC signal based on the signal frequency.

[0101] The control circuit is also used to adjust the signal frequency of the set control signal sent to the three-phase main power circuit, so that when the set control signal is sent to the three-phase main power circuit, the signal frequency of the set control signal can be used to adjust the switching state of the three-phase main power circuit, thereby adjusting the waveform frequency of the first AC signal corresponding to the output of the three-phase main power circuit.

[0102] S44: Adjust the first AC signal to a resonant current signal based on the waveform frequency.

[0103] When receiving the first AC signal sent by the three-phase main power circuit, the three-phase resonant circuit can also adjust the first AC signal into a resonant current signal in response to the waveform frequency of the first AC signal being a specific frequency that causes its internal capacitors and inductors to reach a resonant state.

[0104] Among them, the control circuit specifically adjusts the signal frequency of the set control signal sent to the three-phase main power circuit, thereby adjusting the waveform frequency of the first AC signal output by the three-phase main power circuit to the three-phase resonant circuit until the three-phase resonant circuit reaches a resonant state, and adjusts the first AC signal to a resonant current signal.

[0105] S45: Convert the resonant current signal into a sampling voltage signal.

[0106] The three-phase current sampling circuit is used to sample and obtain a resonant current signal from a three-phase resonant circuit, and convert the resonant current signal into a sampling voltage signal that is convenient for subsequent circuit processing.

[0107] S46: Compare the sampled voltage signal with the set reference voltage to obtain a comparison output signal.

[0108] The voltage comparison circuit is coupled to the three-phase current sampling circuit and the control circuit to receive the sampling voltage signal sent by the three-phase current sampling circuit, and compare the sampling voltage signal with the set reference voltage to generate a corresponding comparison output signal.

[0109] Optionally, the voltage comparison circuit can specifically use one or more of any reasonable circuit elements such as an operational amplifier or a dedicated comparator chip to implement voltage comparison, such as outputting a comparison output signal of a first level when the sampled voltage signal is higher than a set reference voltage, and outputting a comparison output signal of a second level when the sampled voltage signal is lower than the set reference voltage. The present application does not limit this.

[0110] S47: converting the first DC signal into a first AC signal based on the level state of the comparison output signal, or stopping converting the first DC signal into the first AC signal.

[0111] The control circuit is also used to receive the comparison output signal sent by the voltage comparison circuit to decide whether to send a setting control signal to the three-phase main power circuit according to the level state of the comparison output signal. For example, when the comparison output signal is at a first level, the setting control signal is sent to the three-phase main power circuit, and when the comparison output signal is at a second level, the setting control signal is stopped from being sent to the three-phase main power circuit.

[0112] Optionally, the first level is a high level, and the second level is a low level or a 0 level; or, the first level is a low level or a 0 level, and the second level is a high level, which is not limited in the present application.

[0113] It can be understood that the control circuit specifically starts or shuts down certain switching devices in the three-phase main power circuit based on the level state of the voltage comparison circuit output, so as to send a set control signal to the three-phase main power circuit or stop sending a set control signal to adjust the working state of the three-phase main power circuit.

[0114] Among them, when the overcurrent state occurs in the resonant current signal in the three-phase resonant circuit, it will be sampled by the three-phase current sampling circuit, converted into a sampling voltage signal, and sent to the voltage comparison circuit, so that the voltage comparison circuit compares it with the set reference voltage to obtain a comparison output signal of the second level, so that the control circuit stops sending the set control signal to the three-phase main power circuit, that is, the three-phase main power circuit is blocked and the drive is blocked. The three-phase main power circuit will stop outputting the first AC signal to the three-phase resonant circuit, thereby suppressing the overcurrent of the resonant current signal, and can also timely suppress the loss of the circuit caused by the overcurrent.

[0115] When the resonant current signal in the three-phase resonant circuit is in a normal state, the comparison output signal obtained by the voltage comparison circuit comparing it with the set reference voltage will be at the first level, and the control circuit will normally send the set control signal to the three-phase main power circuit.

[0116] It can be seen that the size of the sampled voltage signal corresponding to the set reference voltage limits a set threshold range, and the size of the sampled voltage signal corresponds to the size of the resonant current signal, or the sampled voltage signal is positively correlated with the resonant current signal. The set reference voltage can be set specifically according to the threshold range of whether the resonant current signal is overcurrent, so that when the resonant current signal is overcurrent, the control circuit can promptly seal the three-phase main power circuit to avoid loss to the circuit.

[0117] See also Figure 5 , Figure 5 yes Figure 4 In one embodiment, the power supply adjustment method of the present application includes not only the above-mentioned S41-S47, but also some more specific steps. Specifically, the above-mentioned S45 may also include the following steps:

[0118] S451: Convert the resonant current signal into a sampling current signal.

[0119] Specifically, the three-phase current sampling circuit specifically includes a three-phase current transformer and a three-phase rectifier circuit. The three-phase current transformer is coupled to the three-phase resonant circuit and the three-phase rectifier circuit. The three-phase rectifier circuit is coupled to the voltage comparison circuit.

[0120] The three-phase current transformer is used to sample and obtain the resonant current signal in the three-phase resonant circuit, so as to convert the resonant current signal into a sampling current signal of a suitable size for subsequent circuit processing, and provide safety electrical isolation and voltage matching.

[0121] S452: Convert the sampled current signal into a sampled voltage signal.

[0122] The three-phase rectifier circuit receives a sampling current signal sent by a three-phase current transformer, and converts the sampling current signal into a sampling voltage signal.

[0123] It is understandable that in some other embodiments, the power regulation circuit specifically includes some other more specific circuit units to be able to implement other more specific control methods. For details, please refer to Figure 1-Figure 3 And related text descriptions will not be repeated here.

[0124] This application also specifically uses an electronic device, see Figure 6 , Figure 6 Schematic diagram of the framework of an electronic device of the present application. In this embodiment, the electronic device 50 includes a housing 51 and a power supply regulating circuit 52 connected to the housing 51 .

[0125] Optionally, the electronic device 50 may be any reasonable electronic mechanical device such as a DC charging pile, a large charging device, etc., and this application does not limit this.

[0126] It should be noted that the power supply regulating circuit 52 described in this embodiment is the power supply regulating circuit 10, the power supply regulating circuit 20 or the power supply regulating circuit 30 described in any one of the above embodiments. Figure 1-Figure 3 And the related text content will not be repeated here.

[0127] The beneficial effects of the present application are as follows: different from the prior art, the control circuit in the power supply regulation circuit provided by the present application is used to adjust the signal frequency of the set control signal; the three-phase main power circuit is used to receive the first DC signal sent by the DC power supply, and convert the first DC signal into a first AC signal in response to the set control signal, and adjust the waveform frequency of the first AC signal based on the signal frequency; the three-phase resonant circuit adjusts the first AC signal to a resonant current signal in response to the waveform frequency; the three-phase current sampling circuit samples and obtains the resonant current signal in the three-phase resonant circuit, and converts the resonant current signal into a sampled voltage signal; the voltage comparison circuit compares the sampled voltage signal with the set reference voltage to obtain a comparison output signal; the control circuit is also used to send a set control signal to the three-phase main power circuit based on the level state of the comparison output signal, or stop sending the set control signal to the three-phase main power circuit, so that overcurrent protection can be fully and effectively implemented for the three-phase main power circuit and the post-circuit through sampling and feedback control of the resonant current signal, so as to effectively improve the power supply stability and reliability of the power supply regulation circuit.

[0128] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A power supply regulating circuit, characterized in that: The power supply regulation circuit comprises: A three-phase main power circuit, used to couple with a DC power supply to receive a first DC signal sent by the DC power supply; A three-phase resonant circuit coupled to the three-phase main power circuit; A three-phase isolation transformer and a Y-type three-phase rectifier circuit, wherein the three-phase isolation transformer is coupled to the three-phase resonant circuit and the Y-type three-phase rectifier circuit, and the Y-type three-phase rectifier circuit is used to couple with a load circuit; wherein the Y-type three-phase rectifier circuit comprises a first Y-type three-phase rectifier circuit, a second Y-type three-phase rectifier circuit, a first output terminal, a second output terminal, a third output terminal and a ground terminal, wherein the first output terminal is used to couple with the first terminal of the load circuit, the second output terminal is coupled with the third output terminal, and the ground terminal is used to couple with the second terminal of the load circuit; or, the first output terminal is coupled with the third output terminal and is used to couple with the first terminal of the load circuit, and the second output terminal is coupled with the ground terminal and is used to couple with the second terminal of the load circuit; a control circuit coupled to the three-phase main power circuit, the control circuit being used to adjust the signal frequency of the setting control signal sent to the three-phase main power circuit; wherein the three-phase main power circuit is used to receive the setting control signal sent by the control circuit, so as to convert the first DC signal into a first AC signal in response to the setting control signal, and adjust the waveform frequency of the first AC signal based on the signal frequency; the three-phase resonant circuit receives the first AC signal sent by the three-phase main power circuit, and adjusts the first AC signal into a resonant current signal in response to the waveform frequency; A three-phase current sampling circuit, coupled to the three-phase resonant circuit, to sample and obtain the resonant current signal in the three-phase resonant circuit, and convert the resonant current signal into a sampling voltage signal; A voltage comparison circuit is coupled to the three-phase current sampling circuit and the control circuit to receive the sampling voltage signal sent by the three-phase current sampling circuit and compare the sampling voltage signal with a set reference voltage to obtain a comparison output signal; Wherein, the three-phase current sampling circuit includes a three-phase current transformer and a three-phase rectifier circuit, the three-phase rectifier circuit includes a full-bridge switch subcircuit and a filter output subcircuit, the three-phase current transformer is coupled to the three-phase resonant circuit, the full-bridge switch subcircuit is coupled to the three-phase current transformer and the filter output subcircuit, and the filter output subcircuit is coupled to the voltage comparison circuit; The three-phase current transformer includes an A-phase current transformer, a B-phase current transformer and a C-phase current transformer, the A-phase current transformer includes a primary A-phase winding and a secondary A-phase winding, the B-phase current transformer includes a primary B-phase winding and a secondary B-phase winding, and the C-phase current transformer includes a primary C-phase winding and a secondary C-phase winding; the full-bridge switch subcircuit includes a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube and a sixth switch tube; the filter output subcircuit includes a first filter capacitor, a filter resistor and a second filter capacitor; The second end of the first switch tube is coupled to the second end of the second switch tube, the second end of the third switch tube, the first end of the filter resistor, the first end of the first filter capacitor and the voltage comparison circuit; the first end of the second filter capacitor is coupled to the second end of the secondary A-phase winding, the second end of the secondary B-phase winding and the second end of the secondary C-phase winding; the second end of the second filter capacitor is coupled to the first end of the fourth switch tube, the first end of the fifth switch tube, the first end of the sixth switch tube, the second end of the filter resistor and the second end of the first filter capacitor and is grounded; The control circuit is also used to receive the comparison output signal sent by the voltage comparison circuit, and send the setting control signal to the three-phase main power circuit based on the level state of the comparison output signal, or stop sending the setting control signal to the three-phase main power circuit.

2. The power supply regulating circuit according to claim 1, characterized in that: The three-phase current transformer is used to sample and obtain the resonant current signal in the three-phase resonant circuit, and convert the resonant current signal into a sampling current signal to send to the three-phase rectifier circuit, so that the three-phase rectifier circuit converts the sampling current signal into the sampling voltage signal.

3. The power supply regulating circuit according to claim 2, characterized in that: The full-bridge switch subcircuit is used to receive the sampled current signal sent by the three-phase current transformer and convert the sampled current signal into a second DC signal; The filter output subcircuit receives the second DC signal sent by the full-bridge switch subcircuit, and converts the second DC signal into the sampled voltage signal.

4. The power supply regulating circuit according to claim 3, characterized in that: The first end and the second end of the primary A-phase winding are respectively coupled to the first end and the second end of the three-phase resonant circuit, and are coupled to the secondary A-phase winding. The first end of the secondary A-phase winding is coupled to the first end of the first switch tube and the second end of the fourth switch tube. The first end and the second end of the primary B-phase winding are respectively coupled to the third end and the fourth end of the three-phase resonant circuit, and are coupled to the secondary B-phase winding. The first end of the secondary B-phase winding is coupled to the first end of the second switch tube and the second end of the fifth switch tube. The first end and the second end of the primary C-phase winding are respectively coupled to the fifth end and the sixth end of the three-phase resonant circuit, and are coupled to the secondary C-phase winding. The first end of the secondary C-phase winding is coupled to the first end of the first switch tube and the second end of the fourth switch tube. The second end of the secondary A-phase winding is coupled to the second end of the secondary B-phase winding, the second end of the secondary C-phase winding, the first end of the fourth switch tube, the first end of the fifth switch tube, the first end of the sixth switch tube, the second end of the filter resistor, and the second end of the first filter capacitor and grounded.

5. The power supply regulating circuit according to claim 4, characterized in that: The filter resistor includes at least two resistor unit groups connected in series, and each of the resistor unit groups includes at least two resistor elements connected in parallel.

6. The power supply regulating circuit according to claim 4, characterized in that: The voltage comparison circuit includes a voltage comparator, a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor; Wherein, the first end of the first resistor is coupled to the second end of the first switch tube, the second end of the second switch tube, the second end of the third switch tube, the first end of the filter resistor and the first end of the first filter capacitor, the second end of the first resistor is coupled to the first end of the first capacitor, the first end of the second resistor and the first end of the third resistor, the second end of the first capacitor is grounded, the second end of the second resistor is coupled to the first end of the second capacitor and the negative input end of the voltage comparator, the second end of the third resistor is coupled to the first end of the fourth resistor and the first level providing end, the second end of the fourth resistor is coupled to the second end of the second capacitor, the positive input end of the voltage comparator, the first end of the fifth resistor and the first end of the sixth resistor, the second end of the fifth resistor is grounded, the second end of the sixth resistor is coupled to the output end of the voltage comparator, the first end of the seventh resistor and the first end of the eighth resistor, the power supply end of the voltage comparator is coupled to the second level providing end, the ground end of the voltage comparator is grounded, the second end of the seventh resistor is coupled to the third level providing end, the second end of the eighth resistor is coupled to the first end of the third capacitor and the control circuit, and the second end of the third capacitor is grounded.

7. The power supply regulating circuit according to any one of claims 1 to 6, characterized in that: The three-phase main power circuit includes an input capacitor, a first power switch tube, a second power switch tube, a third power switch tube, a fourth power switch tube, a fifth power switch tube and a sixth power switch tube, and the three-phase resonant circuit includes a first resonant capacitor, a first resonant inductor, a second resonant capacitor, a second resonant inductor, a third resonant capacitor and a third resonant inductor; Wherein, the first end of the input capacitor is coupled to the first end of the first power switch tube, the first end of the second power switch tube and the first end of the third power switch tube, and is used to couple with the first end of the DC power supply, the second end of the input capacitor is coupled to the second end of the fourth power switch tube, the second end of the fifth power switch tube and the second end of the sixth power switch tube, and is used to couple with the second end of the DC power supply, the second end of the first power switch tube is coupled to the first end of the fourth power switch tube and the first end of the first resonant capacitor, the second end of the second power switch tube is coupled to the first end of the fifth power switch tube and the second The first end of the resonant capacitor and the second end of the third power switch tube are coupled to the first end of the sixth power switch tube and the first end of the third resonant capacitor, the second end of the first resonant capacitor is coupled to the first end of the three-phase current sampling circuit, the second end of the three-phase current sampling circuit is coupled to the first end of the first resonant inductor, the second end of the second resonant capacitor is coupled to the third end of the three-phase current sampling circuit, the fourth end of the three-phase current sampling circuit is coupled to the first end of the second resonant inductor, the second end of the third resonant capacitor is coupled to the fifth end of the three-phase current sampling circuit, and the sixth end of the three-phase current sampling circuit is coupled to the first end of the third resonant inductor.

8. The power supply regulating circuit according to claim 7, characterized in that: The three-phase isolation transformer comprises an A-phase primary winding, a B-phase primary winding, a C-phase primary winding, an A-phase secondary winding, a B-phase secondary winding and a C-phase secondary winding; Among them, the second end of the first resonant inductor is coupled to the first end of the A-phase primary winding, the second end of the second resonant inductor is coupled to the first end of the B-phase primary winding, the second end of the third resonant inductor is coupled to the first end of the C-phase primary winding, the second end of the A-phase primary winding is coupled to the second end of the B-phase primary winding and the second end of the C-phase primary winding, the A-phase primary winding is coupled to the A-phase secondary winding, the B-phase primary winding is coupled to the B-phase secondary winding, and the C-phase primary winding is coupled to the C-phase secondary winding.

9. A power supply regulation method, characterized in that: Applied to the power supply regulation circuit according to any one of claims 1 to 8, the power supply regulation method comprises: receiving a first DC signal sent by an external DC power source; Converting the first DC signal into a first AC signal using a set control signal; adjusting the signal frequency of the setting control signal to adjust the waveform frequency of the first AC signal based on the signal frequency; adjusting the first AC signal to a resonant current signal based on the waveform frequency; Converting the resonant current signal into a sampling voltage signal; Comparing the sampled voltage signal with a set reference voltage to obtain a comparison output signal; The first DC signal is converted into a first AC signal based on the level state of the comparison output signal, or the conversion of the first DC signal into the first AC signal is stopped.

10. The power supply adjustment method according to claim 9, characterized in that: The step of converting the resonant current signal into a sampling voltage signal comprises: Converting the resonant current signal into a sampling current signal; The sampled current signal is converted into the sampled voltage signal.

11. An electronic device, characterized in that: The electronic device comprises a housing and a power regulating circuit connected to the housing; Wherein, the power supply regulation circuit is the power supply regulation circuit as claimed in any one of claims 1-8.

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