Power supply adjusting circuit and electronic equipment

Abstract

The utility model discloses a power supply adjusting circuit and electronic equipment, and the power supply adjusting circuit comprises a three-phase main power circuit which receives a first DC signal transmitted by a DC power supply and converts the first DC signal into a first AC signal; the three-phase resonance circuit is used for receiving and adjusting the first alternating current signal; the three-phase isolation transformer receives the adjusted first alternating current signal and converts the adjusted first alternating current signal into a second alternating current signal; the Y-type three-phase rectifying circuit is used for receiving the second alternating current signal sent by the three-phase isolation transformer, converting the second alternating current signal into a second direct current signal and outputting the second direct current signal to the load circuit; and the capacitor circuit is coupled between the Y-type connection midpoint of the Y-type three-phase rectifying circuit and the grounding end so as to limit the output voltage of the second direct current signal within a first threshold range. By means of the mode, the power supply adjusting circuit can effectively utilize the capacitance circuit to suppress common-mode interference, and therefore the requirement of a load circuit for the output voltage of the power supply is met.

Description

Technical Field

[0001] This application relates to the technical field of power supplies, and particularly to a power supply regulation circuit and an electronic device. Background Art

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

[0003] However, the three-phase rectifier circuit at the end of the existing DC charging pile usually adopts a Y-type connection. However, this connection method is more likely to cause signal interference at the midpoint of the Y-type connection. As a result, when there is no load, the output voltage of the three-phase rectifier circuit at the end will be higher than the target output voltage set at startup, thus not meeting the requirements of the load circuit, that is, the battery's demand for the output voltage of the DC charging pile. Summary of the Invention

[0004] The main technical problem to be solved by this application is to provide a power supply regulation circuit and an electronic device, which can solve the problem that the output voltage of the power supply regulation circuit in the prior art is higher than the target output voltage set at startup, thus not meeting the demand of the load circuit for the output voltage of the power supply.

[0005] To solve the above technical problem, a technical solution adopted by this application is: to provide a power supply regulation circuit, wherein the power supply regulation circuit includes: a three-phase main power circuit for coupling with a DC power supply to receive a first DC signal sent by the DC power supply and convert the first DC signal into a first AC signal; a three-phase resonant circuit coupled to the three-phase main power circuit to receive and regulate the first AC signal sent by the three-phase main power circuit; a three-phase isolation transformer coupled to the three-phase resonant circuit to receive the regulated first AC signal sent by the three-phase resonant circuit and convert the regulated first AC signal into a second AC signal; a Y-type three-phase rectifier circuit coupled to the three-phase isolation transformer and used to couple with a load circuit to receive the second AC signal sent by the three-phase isolation transformer and convert the second AC signal into a second DC signal for output to the load circuit; a capacitor circuit coupled between the midpoint of the Y-type connection of the Y-type three-phase rectifier circuit and the ground terminal to limit the output voltage of the second DC signal within a first threshold range.

[0006] Among them, the three-phase isolation transformer includes a primary winding, a first secondary winding, and a second secondary winding. The Y-type three-phase rectifier circuit includes a first Y-type three-phase rectifier sub-circuit and a second Y-type three-phase rectifier sub-circuit. The capacitor circuit includes a first capacitor sub-circuit and a second capacitor sub-circuit. Among them, the primary winding is coupled to the three-phase resonant circuit and is coupled to the first secondary winding and the second secondary winding. The first secondary winding is coupled to the first Y-type three-phase rectifier sub-circuit, and the second secondary winding is coupled to the second Y-type three-phase rectifier sub-circuit. The first capacitor sub-circuit is coupled between the midpoint of the first Y-type connection of the first Y-type three-phase rectifier sub-circuit and the ground terminal, and the second capacitor sub-circuit is coupled between the midpoint of the second Y-type connection of the second Y-type three-phase rectifier sub-circuit and the ground terminal.

[0007] Among them, the first secondary winding includes a first-phase-A secondary winding, a first-phase-B secondary winding, and a first-phase-C secondary winding. The second secondary winding includes a second-phase-A secondary winding, a second-phase-B secondary winding, and a second-phase-C secondary winding. The first Y-type three-phase rectifier sub-circuit 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 second Y-type three-phase rectifier sub-circuit includes a seventh switch tube, an eighth switch tube, a ninth switch tube, a tenth switch tube, an eleventh switch tube, and a twelfth switch tube. Among them, the first end of the first-phase-A secondary winding is coupled to the first end of the first-phase-B secondary winding and the first end of the first-phase-C secondary winding to form the midpoint of the first Y-type connection and is coupled to the first end of the first capacitor sub-circuit. The second end of the first-phase-A secondary 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 first-phase-B secondary winding is coupled to the first end of the second switch tube and the second end of the fifth switch tube. The second end of the first-phase-C secondary winding is coupled to the first end of the third switch tube and the second end of the sixth switch tube. The second end of the first switch tube is coupled to the second end of the second switch tube and the second end of the third switch tube to form the first output terminal. The first end of the fourth switch tube is coupled to the first end of the fifth switch tube and the first end of the sixth switch tube to form the second output terminal. The first end of the second-phase-A secondary winding is coupled to the first end of the second-phase-B secondary winding and the first end of the second-phase-C secondary winding to form the midpoint of the second Y-type connection and is coupled to the first end of the second capacitor sub-circuit. The second end of the second-phase-A secondary winding is coupled to the first end of the seventh switch tube and the second end of the tenth switch tube. The second end of the second-phase-B secondary winding is coupled to the first end of the eighth switch tube and the second end of the eleventh switch tube. The second end of the second-phase-C secondary winding is coupled to the first end of the ninth switch tube and the second end of the twelfth switch tube. The second end of the seventh switch tube is coupled to the second end of the eighth switch tube and the second end of the ninth switch tube to form the third output terminal. The first end of the tenth switch tube is coupled to the first end of the eleventh switch tube and the first end of the twelfth switch tube to form the ground terminal. The second end of the first capacitor sub-circuit and the second end of the second capacitor sub-circuit are coupled to the ground terminal.

[0008] Wherein, the first output terminal is used to be coupled to the first end of the load circuit, the second output terminal is coupled to the third output terminal, and the ground terminal is used to be coupled to the second end of the load circuit; or, the first output terminal is coupled to the third output terminal and is used to be coupled to the first end of the load circuit, the second output terminal is coupled to the ground terminal and is used to be coupled to the second end of the load circuit.

[0009] Wherein, the three-phase main power circuit includes an input capacitor, a first power switch, a second power switch, a third power switch, a fourth power switch, a fifth power switch, and a sixth power switch; 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; the primary winding includes a phase-A primary winding, a phase-B primary winding, and a phase-C primary winding. Wherein, the first end of the input capacitor is coupled to the first ends of the first power switch, the second power switch, and the third power switch, and is used to be coupled to the first end of the DC power supply; the second end of the input capacitor is coupled to the second ends of the fourth power switch, the fifth power switch, and the sixth power switch, and is used to be coupled to the second end of the DC power supply; the second end of the first power switch is coupled to the first end of the fourth power switch and the first end of the first resonant capacitor; the second end of the second power switch is coupled to the first end of the fifth power switch and the first end of the second resonant capacitor; the second end of the third power switch is coupled to the first end of the sixth power switch 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 first resonant inductor; the second end of the second resonant capacitor is coupled to the first end of the second resonant inductor; the second end of the third resonant capacitor is coupled to the first end of the third resonant inductor; the second end of the first resonant inductor is coupled to the first end of the phase-A primary winding; the second end of the second resonant inductor is coupled to the first end of the phase-B primary winding; the second end of the third resonant inductor is coupled to the first end of the phase-C primary winding; the second end of the phase-A primary winding is coupled to the second ends of the phase-B primary winding and the phase-C primary winding; the phase-A primary winding is coupled to the first phase-A secondary winding and the second phase-A secondary winding; the phase-B primary winding is coupled to the first phase-B secondary winding and the second phase-B secondary winding; the phase-C primary winding is coupled to the first phase-C secondary winding and the second phase-C secondary winding.

[0010] Wherein, the first capacitor sub-circuit includes at least two first capacitor groups connected in series with each other, and each first capacitor group includes at least two first capacitor elements connected in parallel with each other; the second capacitor sub-circuit includes at least two second capacitor groups connected in series with each other, and each second capacitor group includes at least two second capacitor elements connected in parallel with each other.

[0011] Wherein, the number of the first capacitor elements in the first capacitor sub-circuit is greater than the number of the second capacitor elements in the second capacitor sub-circuit.

[0012] Among them, the power supply regulation circuit further includes a control circuit. The control circuit is coupled to the three-phase main power circuit and the Y-type three-phase rectifier circuit. The control circuit samples and obtains a second DC signal in the Y-type three-phase rectifier circuit to adjust the signal frequency of the set control signal based on the second DC signal. The three-phase main power circuit is configured to receive the set control signal sent by the control circuit and adjust the first AC signal based on the set control signal, so that the three-phase resonant circuit operates at the resonant frequency.

[0013] Among them, the power supply regulation circuit further includes a three-phase current sampling circuit. The three-phase current sampling circuit is coupled to the three-phase resonant circuit and the control circuit. The three-phase current sampling circuit samples and obtains the first AC signal in the three-phase resonant circuit. The control circuit is configured to receive the first AC signal sent by the three-phase current sampling circuit and stop sending the set control signal to the three-phase main power circuit when the first AC signal is higher than the second threshold range.

[0014] To solve the above technical problems, another technical solution adopted by this application is: to provide an electronic device, where the electronic device includes a housing and a power supply regulation circuit connected to the housing. Among them, the power supply regulation circuit is the power supply regulation circuit described in any one of the above.

[0015] The beneficial effects of this application are as follows: Different from the prior art, in the power supply regulation circuit provided by this application, the three-phase main power circuit is used to be coupled to a DC power supply to receive the first DC signal sent by the DC power supply and convert the first DC signal into a first AC signal. The three-phase resonant circuit is coupled to the three-phase main power circuit to receive and adjust the first AC signal. The three-phase isolation transformer is coupled to the three-phase resonant circuit to receive the adjusted first AC signal and convert the adjusted first AC signal into a second AC signal. The Y-type three-phase rectifier circuit is coupled to the three-phase isolation transformer and is used to be coupled to the load circuit to receive the second AC signal and convert the second AC signal into a second DC signal for output to the load circuit. The capacitor circuit is coupled between the neutral point of the Y-type connection of the Y-type three-phase rectifier circuit and the ground terminal to limit the output voltage of the second DC signal within the first threshold range, so as to be able to suppress the common-mode interference that may exist in the power supply regulation circuit by using the capacitor circuit and effectively meet the requirements of the load circuit for the output voltage of the power supply. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings, where:

[0017] Figure 1It is a schematic structural diagram of the first embodiment of the power supply regulation circuit of the present application;

[0018] Figure 2 It is a schematic structural diagram of the second embodiment of the power supply regulation circuit of the present application;

[0019] Figure 3 It is a schematic structural diagram of the third embodiment of the power supply regulation circuit of the present application;

[0020] Figure 4 It is a schematic framework diagram of an embodiment of the electronic device of the present application. Specific Embodiments

[0021] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0022] The terms "first", "second", and "third" in the present application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", and "third" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. All directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. 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 further includes unlisted steps or units, or optionally further includes other steps or units inherent to these processes, methods, products, or devices.

[0023] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0024] The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0025] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram 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 three-phase isolation transformer 13, a Y-type three-phase rectifier circuit 14, and a capacitor circuit 15.

[0026] Among them, a power supply regulation circuit 10 provided by the present application is specifically applied to the power supply of a load circuit 102 that requires a DC output, such as battery charging of any reasonable electronic devices such as electric vehicles or electric robots. This embodiment does not limit this.

[0027] 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 by power conversion and regulation of grid power supply, photovoltaic power supply, independent generator, or any other reasonable upper-level power supply. The load circuit 102 can be understood as a signal function circuit that operates using the DC output of the power supply regulation circuit 10.

[0028] In addition, "coupled" in this article refers to including any direct and indirect connection means. Therefore, if it is described in the text that the first circuit is coupled to the second circuit, it means that the first circuit can be directly connected to the second circuit through electrical connection, wireless transmission, optical transmission and other signal connection methods, or indirectly electrically connected or signal connected to the second circuit through other circuits or connection means.

[0029] Specifically, the three-phase main power circuit 11 is used to physically and electrically connect to an 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, and use its internal switching action mechanism, such as the on-off action mechanism of switching devices such as IGBT (Insulated Gate Bipolar Transistor), high-frequency transistors, and MOS (Metal Oxide Semiconductor Field Effect Transistor), to quickly switch DC electrical energy under signal control to generate an alternating voltage waveform and obtain a first AC signal. Among them, since it is a three-phase power supply system, the three-phase main power circuit 11 actually outputs a three-phase AC signal.

[0030] The three-phase resonant circuit 12 is coupled to the three-phase main power circuit 11. Its function is to receive the first AC signal sent by the three-phase main power circuit 11 and make the capacitors and inductors inside it reach the resonant state at a specific frequency of the first AC signal, thereby improving the quality of the output signal and reducing harmonic distortion.

[0031] The three-phase isolation transformer 13 is coupled to the three-phase resonant circuit 12. The first AC signal adjusted by the three-phase resonant circuit 12 will be sent to the primary side of the three-phase resonant circuit 12 to use the coupling of the primary and secondary windings of the three-phase resonant circuit 12 to convert the adjusted first AC signal into a second AC signal, which is used to achieve the safety isolation and voltage matching between the primary and secondary sides, meet the electrical safety insulation requirements for the primary and secondary sides, and at the same time transform the voltage according to the required voltage level.

[0032] The Y-type three-phase rectifier circuit 14 is coupled to the three-phase isolation transformer 13 and is used to be coupled to the load circuit 102. The Y-type three-phase rectifier circuit 14 is used to receive the second AC signal from the three-phase isolation transformer 13 and use high-frequency rectification technologies, such as any reasonable rectification method among PWM, synchronous rectification, reverse damping rectification, etc., to convert the second AC signal into a stable DC output, that is, the second DC signal, and then output it to the load circuit 102 to meet the electrical energy use of the load circuit 102.

[0033] It should be noted that the Y-type three-phase rectifier circuit 14 refers to the use of the Y-type connection method, that is, it is composed of the bridge arms of three switching devices, and each bridge arm is connected to a winding of the three-phase isolation transformer 13.

[0034] This Y-type connection method, also known as the star connection method, is a basic wiring method in power engineering. In a three-phase power system, the Y-type connection method 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 is represented by the letter O. This midpoint is sometimes connected to the ground, making the neutral line also called the ground wire. The wire led out from this point is called the neutral line or the zero line, while the wire led out from the starting end of the three-phase power supply winding is called the phase line or the live wire. The characteristic of this wiring method is that the ends of each phase are connected together to form a neutral point, and the starting ends of each phase are respectively used as the output terminals of the power supply.

[0035] In summary, the Y-type connection method is an important wiring method in power engineering. By connecting one end of the three-phase power supply or load together to form a neutral point and respectively leading out the phase line and the neutral line, stable power supply of the power system is achieved. This wiring method is widely used in various equipment that requires three-phase power supplies, ensuring the normal operation of the equipment and the safety and stability of the power system.

[0036] Optionally, the load circuit 102 may specifically be a rechargeable battery in any reasonable electronic device such as an electric vehicle, a large unmanned aerial vehicle, or an electric robot, and the present application does not make any limitation thereto.

[0037] Further, the capacitor circuit 15 is coupled between the neutral point of the Y-type three-phase rectifier circuit 14 in the Y-type connection and the ground terminal. The capacitor circuit 15 is generally used for filtering and smoothing the DC output to reduce the ripple voltage. In the Y-type connection, the capacitor circuit 15 is connected between the neutral point and the ground, and will stabilize the DC output voltage. By selecting an appropriate capacitance value, it can be ensured that the output voltage is maintained 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 consumption requirements of the load circuit 102.

[0038] 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 demand for electric vehicle battery charging, and at the same time to maintain the system energy efficiency and stability.

[0039] In addition, the ground terminal can be specifically understood as the control ground or the output ground of the load circuit 102.

[0040] In the above solution, by coupling the capacitor circuit 15 between the neutral point of the Y-type three-phase rectifier circuit 14 in the Y-type connection and the ground terminal, the common-mode interference signals that may exist in the power supply regulation circuit 10 can be effectively filtered out to stabilize the control ground, and the output voltage of the second DC signal supplied to the load circuit 102 is limited within the first threshold range, thereby effectively meeting the demand of the load circuit 102 for the output voltage of the power supply.

[0041] Please refer to Figure 2 , Figure 2 which is a schematic structural diagram of the second embodiment of the power supply regulation circuit of the present application. The difference between the power supply regulation circuit in this embodiment and the first embodiment of the power supply regulation circuit provided by the present application is that the three-phase isolation transformer 23 in the power supply regulation circuit 20 further specifically includes a primary winding 231, a first secondary winding 232, and a second secondary winding 233.

[0042] The Y-type three-phase rectifier circuit 24 further includes a first Y-type three-phase rectifier sub-circuit 241 and a second Y-type three-phase rectifier sub-circuit 242, and the capacitor circuit 25 further includes a first capacitor sub-circuit 251 and a second capacitor sub-circuit 252.

[0043] Specifically, the primary side winding 231 is coupled to the three-phase resonant circuit 22 and is coupled to the first secondary side winding 232 and the second secondary side winding 233. The first secondary side winding 232 is coupled to the first Y-shaped three-phase commutation circuit 241, and the second secondary side winding 233 is coupled to the second Y-shaped three-phase commutation circuit 242. Moreover, the first Y-shaped three-phase commutation circuit 241 and the second Y-shaped three-phase commutation circuit 242 can be specifically connected in series or in parallel with each other to jointly supply power to the load circuit 102.

[0044] Among them, the first capacitor sub-circuit 251 is specifically coupled between the neutral point of the first Y-shaped connection of the first Y-shaped three-phase commutation circuit 241 and the ground terminal. The second capacitor sub-circuit 252 is coupled between the neutral point of the second Y-shaped connection of the second Y-shaped three-phase commutation circuit 242 and the ground terminal. The first capacitor sub-circuit 251 can cooperate with the second capacitor sub-circuit 252 correspondingly to effectively filter out the common-mode interference signals that may exist in the first Y-shaped three-phase commutation circuit 241 and the second Y-shaped three-phase commutation circuit 242, thereby stabilizing the ground terminal.

[0045] In an embodiment, the power supply adjustment circuit 20 further specifically includes a control circuit 26, and the control circuit 26 is coupled to the three-phase main power circuit 21 and the Y-shaped three-phase rectification circuit 24.

[0046] Among them, the control circuit 26 is used to obtain the output second DC signal from the Y-shaped three-phase rectification circuit 24 so as to monitor the fluctuations of the output voltage or current, and to adjust the signal frequency of the set control signal according to the sampled second DC signal to make it match the resonance frequency of the three-phase resonant circuit 22. This is usually achieved through a feedback control mechanism to ensure the quality and stability of the output signal.

[0047] The three-phase main power circuit 21 is used to receive the set control signal from the control circuit 26. The set control signal contains information for adjusting the output signal frequency, that is, to adjust the internal switch state according to the received set control signal, and then to adjust the waveform frequency of the output first AC signal so that the three-phase resonant circuit 22 operates at the resonance frequency. This precise frequency matching helps to optimize the quality of the output signal, reduce harmonic distortion, and improve the efficiency and stability of the overall system.

[0048] 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 preferably a PFM signal with a duty cycle of 50%. The present application does not make any limitations in this regard.

[0049] Optionally, the control circuit 26 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, discrete gates or transistor logic devices, discrete hardware, or any other reasonable circuit unit with signal processing functions. The present application does not limit this.

[0050] Further, in an embodiment, the power supply regulation circuit 20 specifically further includes a three-phase current sampling circuit 27, and the three-phase current sampling circuit 27 is coupled to the three-phase resonant circuit 22 and the control circuit 26.

[0051] Among them, the three-phase current sampling circuit 27 is used to sample and obtain the first AC signal in the three-phase resonant circuit 22 and extract the current information therein.

[0052] The control circuit 26 is used to receive the sampled first AC signal, that is, the current information, from the three-phase current sampling circuit 27, and determine whether the first AC signal exceeds a set second threshold range according to the received current information. When it is determined that the first AC signal is higher than the second threshold range, that is, when overcurrent occurs, the control circuit 26 stops sending a set control signal to the three-phase main power circuit 21 to block the wave of the three-phase main power circuit 21, that is, turn off the drive signal, so as to avoid excessive current in the three-phase main power circuit 21, resulting in losses in the three-phase main power circuit 21, and protect the circuit from overload damage, thereby improving the reliability of the entire system.

[0053] It should be noted that the second threshold range is a reasonable voltage and / or current and / or frequency range given to protect the corresponding circuit from overvoltage or overcurrent damage, and at the same time to maintain the energy efficiency and stability of the system.

[0054] Optionally, the three-phase current sampling circuit 27 may specifically include a current transformer and / or a resistor or any other reasonable circuit unit. The present application does not limit this.

[0055] Please refer to Figure 3 , Figure 3 which is a schematic structural diagram of the third embodiment of the power supply regulation circuit of the present application. In this embodiment, the power supply regulation circuit is based on the second embodiment of the power supply regulation circuit provided in the present application. The first secondary winding 332 of the three-phase isolation transformer 33 in the power supply regulation circuit 30 further includes a first phase A secondary winding NA1, a first phase B secondary winding NB1, and a first phase C secondary winding NC1.

[0056] Specifically, the second secondary winding 333 further includes a second-phase-A secondary winding NA2, a second-phase-B secondary winding NB2, and a second-phase-C secondary winding NC2. The first Y-type three-phase rectifier circuit 341 in the three-phase rectifier circuit 34 includes a first switching tube D1, a second switching tube D2, a third switching tube D3, a fourth switching tube D4, a fifth switching tube D5, and a sixth switching tube D6. The second Y-type three-phase rectifier circuit 342 includes a seventh switching tube D7, an eighth switching tube D8, a ninth switching tube D9, a tenth switching tube D10, an eleventh switching tube D11, and a twelfth switching tube D12.

[0057] Among them, the first end of the first-phase-A secondary winding NA1 is coupled to the first end of the first-phase-B secondary winding NB1 and the first end of the first-phase-C secondary winding NC1 to form a midpoint H-N of the first Y-type connection method and is coupled to the first end of the first capacitor sub-circuit 351. The second end of the first-phase-A secondary winding NA1 is coupled to the first end of the first switching tube D1 and the second end of the fourth switching tube D4. The second end of the first-phase-B secondary winding NB1 is coupled to the first end of the second switching tube D2 and the second end of the fifth switching tube D5. The second end of the first-phase-C secondary winding NC1 is coupled to the first end of the third switching tube D3 and the second end of the sixth switching tube D6. The second end of the first switching tube D1 is coupled to the second end of the second switching tube D2 and the second end of the third switching tube D3 to form a first output terminal Vo1. The first end of the fourth switching tube D4 is coupled to the first end of the fifth switching tube D5 and the first end of the sixth switching tube D6 to form a second output terminal 111. The first end of the second-phase-A secondary winding NA2 is coupled to the first end of the second-phase-B secondary winding NB2 and the first end of the second-phase-C secondary winding NC2 to form a midpoint L-N of the second Y-type connection method and is coupled to the first end of the second capacitor sub-circuit 352. The second end of the second-phase-A secondary winding NA2 is coupled to the first end of the seventh switching tube D7 and the second end of the tenth switching tube D10. The second end of the second-phase-B secondary winding NB2 is coupled to the first end of the eighth switching tube D8 and the second end of the eleventh switching tube D11. The second end of the second-phase-C secondary winding NC2 is coupled to the first end of the ninth switching tube D9 and the second end of the twelfth switching tube D12. The second end of the seventh switching tube D7 is coupled to the second end of the eighth switching tube D8 and the second end of the ninth switching tube D9 to form a third output terminal 222. The first end of the tenth switching tube D10 is coupled to the first end of the eleventh switching tube D11 and the first end of the twelfth switching tube D12 to form a ground terminal AGND-A.

[0058] The second ends of the first capacitor sub-circuit 351 and the second capacitor sub-circuit 352 are both correspondingly coupled to the ground terminal AGND-A to cooperate with each other to effectively filter out the common-mode interference signals that may exist in the first Y-type three-phase rectifier circuit 341 and the second Y-type three-phase rectifier circuit 342, thereby stabilizing the ground terminal AGND-A.

[0059] In one embodiment, the first output terminal Vo1 is specifically further configured to be coupled to the first end of a load circuit (not shown in the figure), and the second output terminal 111 is coupled to the third output terminal 222, and the ground terminal AGND-A is used to be coupled to the second end of the load circuit. That is, by connecting the output terminals of the first Y-type three-phase commutator circuit 341 and the second Y-type three-phase commutator circuit 342 in series with each other, they jointly supply power to the load circuit.

[0060] In another embodiment, the first output terminal Vo1 may specifically be further coupled to the third output terminal 222 and is configured to be coupled to the first end of the load circuit, while the second output terminal 111 is coupled to the ground terminal AGND-A and is used to be coupled to the second end of the load circuit. That is, by connecting the output terminals of the first Y-type three-phase commutator circuit 341 and the second Y-type three-phase commutator circuit 342 in parallel with each other, they jointly supply power to the load circuit.

[0061] Optionally, the first switching tube D1, the second switching tube D2, the third switching tube D3, the fourth switching tube D4, the fifth switching tube D5, the sixth switching tube D6, the seventh switching tube D7, the eighth switching tube D8, the ninth switching tube D9, the tenth switching tube D10, the eleventh switching tube D11, and the twelfth switching tube D12 may specifically be diodes, or may be one or a combination of any reasonable switching devices such as MOS transistors, high-frequency transistors, triodes, thyristors, IGBTs, etc. The present application does not make any limitations in this regard.

[0062] And when the above-mentioned switching tubes are specifically one or a combination of any reasonable switching devices such as MOS transistors, high-frequency transistors, triodes, thyristors, IGBTs, etc., the third ends of the respective switching tubes correspond to the control ends and are correspondingly coupled to a control circuit (not shown in the figure) to receive the driving signals sent by the control circuit correspondingly, and trigger conduction or turn-off of their first ends and second ends under the action of the driving signals, so as to convert the second AC signal into a second DC signal and output it to the load circuit.

[0063] In one embodiment, the first capacitor sub-circuit 351 in the capacitor circuit 35 specifically includes at least two first capacitor groups 3511 connected in series with each other, and each of the first capacitor groups 3511 includes at least two first capacitor elements C1 connected in parallel with each other.

[0064] It can be understood that the first capacitor sub-circuit 351 can actually be equivalent to a large capacitor. However, when implementing the large capacitor by using a plurality of first capacitor elements C1 in series and parallel forms, the withstand voltage value of each first capacitor element C1 can be effectively reduced, and it can be implemented by using common small capacitors with standard capacitance values. Compared with large capacitors with non-standard capacitance values, it will have obvious advantages in manufacturing cost and occupied volume, and the performance requirements for each small capacitor are also lower.

[0065] Similarly, the second capacitor sub - circuit 352 specifically includes at least two second capacitor groups 3521 connected in series with each other, and each of the second capacitor groups 3521 includes at least two second capacitor elements C2 connected in parallel with each other.

[0066] Among them, the second capacitor sub - circuit 352 can actually be equivalent to a large capacitor. However, by implementing this large capacitor with a number of second capacitor elements C2 in series and parallel forms, the overall manufacturing cost can be effectively reduced, the overall occupied volume of each second capacitor element C2 can be reduced, and the performance requirements for each second capacitor element C2 are also relatively low.

[0067] Further, in an embodiment, the number of the first capacitor elements C1 in the first capacitor sub - circuit 351 is greater than the number of the second capacitor elements C2 in the second capacitor sub - circuit 352.

[0068] Optionally, the first capacitor element C1 and the second capacitor element C2 can be the same or different, and this application does not make any limitation in this regard.

[0069] It can be understood that during the actual operation of the power supply regulation circuit 30, the voltage at the mid - point H - N of the above - mentioned first Y - type connection method will be higher than the voltage at the mid - point L - N of the second Y - type connection method. When the first capacitor element C1 and the second capacitor element C2 are the same and the number of the first capacitor elements C1 in the first capacitor sub - circuit 351 is equal to the number of the second capacitor elements C2 in the second capacitor sub - circuit 352, each first capacitor element C1 will bear a higher voltage. When a larger number of first capacitor elements C1 are used to form the first capacitor sub - circuit 351 in series and parallel forms, the requirement for the withstand voltage value of each first capacitor element C1 can be effectively reduced, which is convenient for the realization of the functions of the first capacitor sub - circuit 351 and the second capacitor sub - circuit 352.

[0070] Optionally, the first capacitor sub - circuit 351 can specifically include any reasonable number of first capacitor groups 3511 connected in series, such as 2, 3, or 4, and preferably 3. Each of the first capacitor groups 3511 further includes any reasonable number of first capacitor elements C1 connected in parallel, such as 4, 6, or 8, and preferably 6. This application does not make any limitation in this regard.

[0071] Optionally, the second capacitor sub - circuit 352 can specifically include any reasonable number of first capacitor groups 3511 connected in series, such as 2, 3, or 4, and preferably 2. Each of the second capacitor groups 3521 further includes any reasonable number of second capacitor elements C2 connected in parallel, such as 4, 6, or 8, and preferably 4. This application does not make any limitation in this regard.

[0072] In one embodiment, the three-phase main power circuit 31 further specifically includes an input capacitor Cs1, a first power switch Q1, a second power switch Q2, a third power switch Q3, a fourth power switch Q4, a fifth power switch Q5, and a sixth power switch Q6. The three-phase resonant circuit 32 further 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. The primary winding 331 includes a phase-A primary winding NA11, a phase-B primary winding NB22, and a phase-C primary winding NC33.

[0073] Among them, the first end of the input capacitor Cs1 is coupled to the first ends of the first power switch Q1, the second power switch Q2, and the third power switch Q3, and is used to be coupled to the first end of the DC power supply 101. The second end of the input capacitor Cs1 is coupled to the second ends of the fourth power switch Q4, the fifth power switch Q5, and the sixth power switch Q6, and is used to be coupled to the second end of the DC power supply 101. The second end of the first power switch Q1 is coupled to the first end of the fourth power switch Q4 and the first end of the first resonant capacitor Cr1. The second end of the second power switch Q2 is coupled to the first end of the fifth power switch Q5 and the first end of the second resonant capacitor Cr2. The second end of the third power switch Q3 is coupled to the first end of the sixth power switch 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 first resonant inductor Lr1. The second end of the second resonant capacitor Cr2 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 first end of the third resonant inductor Lr3. The second end of the first resonant inductor Lr1 is coupled to the first end of the phase-A primary winding NA11. The second end of the second resonant inductor Lr2 is coupled to the first end of the phase-B primary winding NB22. The second end of the third resonant inductor Lr3 is coupled to the first end of the phase-C primary winding NC33. The second end of the phase-A primary winding NA11 is coupled to the second ends of the phase-B primary winding NB22 and the phase-C primary winding NC33. The phase-A primary winding NA11 is coupled to the first phase-A secondary winding NA1 and the second phase-A secondary winding NA2. The phase-B primary winding NB22 is coupled to the first phase-B secondary winding NB1 and the second phase-B secondary winding NB2. The phase-C primary winding NC33 is coupled to the first phase-C secondary winding NC1 and the second phase-C secondary winding NC2.

[0074] Optionally, the first power switch Q1, the second power switch Q2, the third power switch Q3, the fourth power switch Q4, the fifth power switch Q5, and the sixth power switch Q6 may specifically be one or a combination of any reasonable switching devices such as MOS transistors, high-frequency transistors, triodes, thyristors, IGBTs, etc. The present application does not limit this.

[0075] Moreover, the third ends of the power switching tubes in this text respectively correspond to control ends, which are correspondingly coupled to a control circuit to receive set control signals sent by the control circuit. The set control signals may specifically include a first driving signal PWM-A1, a second driving signal PWM-B1, a third driving signal PWM-C1, a fourth driving signal PWM-A2, a fifth driving signal PWM-B2, and a sixth driving signal PWM-C2, and are respectively output to a first power switching tube Q1, a second power switching tube Q2, a third power switching tube Q3, a fourth power switching tube Q4, a fifth power switching tube Q5, and a sixth power switching tube Q6, and trigger the conduction or cutoff of their first and second ends, thereby converting a first DC signal into a first AC signal.

[0076] In an embodiment, the power supply regulation circuit 30 further specifically includes a three-phase current sampling circuit 37, and the three-phase current sampling circuit 37 is specifically an A-phase current transformer T1, an A-phase sampling resistor R1, a B-phase current transformer T2, a B-phase sampling resistor R2, a C-phase current transformer T3, and a C-phase sampling resistor R3. The A-phase current transformer T1 further includes a primary A-phase winding N1 and a secondary A-phase winding N2 coupled to the primary A-phase winding N1. The B-phase current transformer T2 further includes a primary B-phase winding N3 and a secondary B-phase winding N4 coupled to the primary B-phase winding N3. The C-phase current transformer T3 further includes a primary C-phase winding N5 and a secondary C-phase winding N6 coupled to the primary C-phase winding N5.

[0077] Wherein, the first end of the primary A-phase winding N1 is coupled to the second end of a first resonant capacitor Cr1, and the second end of the primary A-phase winding N1 is coupled to the first end of a first resonant inductor Lr1. The first end of the secondary A-phase winding N2 is coupled to the first end of the A-phase sampling resistor R1 and the control circuit, and the second end of the secondary A-phase winding N2 is coupled to the second end of the A-phase sampling resistor R1 and the control circuit. The first end of the primary B-phase winding N3 is coupled to the second end of a second resonant capacitor Cr2, and the second end of the primary B-phase winding N3 is coupled to the first end of a second resonant inductor Lr2. The first end of the secondary B-phase winding N4 is coupled to the first end of the B-phase sampling resistor R2 and the control circuit, and the second end of the secondary B-phase winding N4 is coupled to the second end of the B-phase sampling resistor R2 and the control circuit. The first end of the primary C-phase winding N5 is coupled to the second end of a third resonant capacitor Cr3, and the second end of the primary C-phase winding N5 is coupled to the first end of a third resonant inductor Lr3. The first end of the secondary C-phase winding N6 is coupled to the first end of the C-phase sampling resistor R3 and the control circuit, and the second end of the secondary C-phase winding N6 is coupled to the second end of the C-phase sampling resistor R3 and the control circuit.

[0078] This application specifically also adopts an electronic device. Please refer to Figure 4 ,Figure 4 It is a schematic diagram of the framework of an embodiment of the electronic device of the present application. In this embodiment, the electronic device 40 includes a housing 41 and a power supply regulation circuit 42 connected to the housing 41.

[0079] Optionally, the electronic device 40 may specifically be any reasonable electronic mechanical device such as a DC charging pile, a large charging device, etc., and the present application does not limit this.

[0080] It should be noted that the power supply regulation circuit 42 described in this embodiment is the power supply regulation circuit 10, the power supply regulation circuit 20, or the power supply regulation circuit 30 described in any one of the above embodiments. For details, please refer to Figures 1 - 3 and the relevant text content, which will not be elaborated here.

[0081] The beneficial effect of the present application is: Different from the prior art, in the power supply regulation circuit provided by the present application, the three-phase main power circuit is used to be coupled to a DC power supply to receive a first DC signal sent by the DC power supply and convert the first DC signal into a first AC signal. The three-phase resonance circuit is coupled to the three-phase main power circuit to receive and regulate the first AC signal. The three-phase isolation transformer is coupled to the three-phase resonance circuit to receive the regulated first AC signal and convert the regulated first AC signal into a second AC signal. The Y-type three-phase rectification circuit is coupled to the three-phase isolation transformer and is used to be coupled to a load circuit to receive the second AC signal and convert the second AC signal into a second DC signal for output to the load circuit. The capacitor circuit is coupled between the neutral point of the Y-type connection of the Y-type three-phase rectification circuit and the ground terminal to limit the output voltage of the second DC signal within the first threshold range, so that the common-mode interference that may exist in the power supply regulation circuit can be suppressed by the capacitor circuit, effectively meeting the requirements of the load circuit for the output voltage of the power supply.

[0082] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A power supply regulation circuit, characterized in that, The power supply regulation circuit includes: A three-phase main power circuit, which is used to be coupled with a DC power supply to receive a first DC signal sent by the DC power supply and convert the first DC signal into a first AC signal; A three-phase resonance circuit, which is coupled to the three-phase main power circuit to receive and regulate the first AC signal sent by the three-phase main power circuit; A three-phase isolation transformer, which is coupled to the three-phase resonance circuit to receive the regulated first AC signal sent by the three-phase resonance circuit and convert the regulated first AC signal into a second AC signal; A Y-type three-phase rectification circuit, which is coupled to the three-phase isolation transformer and is used to be coupled with a load circuit to receive the second AC signal sent by the three-phase isolation transformer and convert the second AC signal into a second DC signal for output to the load circuit; A capacitor circuit, which is coupled between the neutral point of the Y-type connection of the Y-type three-phase rectification circuit and the ground terminal to limit the output voltage of the second DC signal within a first threshold range.

2. The power supply regulation circuit according to claim 1, wherein the three-phase isolation transformer includes a primary winding, a first secondary winding, and a second secondary winding, the Y-type three-phase rectification circuit includes a first Y-type three-phase rectification sub-circuit and a second Y-type three-phase rectification sub-circuit, and the capacitor circuit includes a first capacitor sub-circuit and a second capacitor sub-circuit; wherein, the primary winding is coupled to the three-phase resonance circuit and is coupled with the first secondary winding and the second secondary winding, the first secondary winding is coupled to the first Y-type three-phase rectification sub-circuit, the second secondary winding is coupled to the second Y-type three-phase rectification sub-circuit, the first capacitor sub-circuit is coupled between the neutral point of the first Y-type connection of the first Y-type three-phase rectification sub-circuit and the ground terminal, and the second capacitor sub-circuit is coupled between the neutral point of the second Y-type connection of the second Y-type three-phase rectification sub-circuit and the ground terminal.

3. The power supply regulation circuit according to claim 2, wherein the first secondary winding includes a first phase-A secondary winding, a first phase-B secondary winding, and a first phase-C secondary winding, the second secondary winding includes a second phase-A secondary winding, a second phase-B secondary winding, and a second phase-C secondary winding, the first Y-type three-phase rectification sub-circuit 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 second Y-type three-phase rectification sub-circuit includes a seventh switch tube, an eighth switch tube, a ninth switch tube, a tenth switch tube, an eleventh switch tube, and a twelfth switch tube; Among them, the first end of the first secondary winding of phase A is coupled to the first end of the first secondary winding of phase B and the first end of the first secondary winding of phase C to form the midpoint of the first Y-connection, and is coupled to the first end of the first capacitor sub-circuit. The second end of the first secondary winding of phase A is coupled to the first end of the first switch and the second end of the fourth switch. The second end of the first secondary winding of phase B is coupled to the first end of the second switch and the second end of the fifth switch. The second end of the first secondary winding of phase C is coupled to the first end of the third switch and the second end of the sixth switch. The second end of the first switch is coupled to the second end of the second switch and the second end of the third switch to form a first output terminal. The first end of the fourth switch is coupled to the first end of the fifth switch and the first end of the sixth switch to form a second output terminal; The first end of the second secondary winding of phase A is coupled to the first end of the second secondary winding of phase B and the first end of the second secondary winding of phase C to form the midpoint of the second Y-connection, and is coupled to the first end of the second capacitor sub-circuit. The second end of the second secondary winding of phase A is coupled to the first end of the seventh switch and the second end of the tenth switch. The second end of the second secondary winding of phase B is coupled to the first end of the eighth switch and the second end of the eleventh switch. The second end of the second secondary winding of phase C is coupled to the first end of the ninth switch and the second end of the twelfth switch. The second end of the seventh switch is coupled to the second end of the eighth switch and the second end of the ninth switch to form a third output terminal. The first end of the tenth switch is coupled to the first end of the eleventh switch and the first end of the twelfth switch to form the ground terminal. The second end of the first capacitor sub-circuit and the second end of the second capacitor sub-circuit are coupled to the ground terminal.

4. The power supply regulation circuit according to claim 3, wherein the first output terminal is used to be coupled to the first end of the load circuit, the second output terminal is coupled to the third output terminal, and the ground terminal is used to be coupled to the second end of the load circuit; or, the first output terminal is coupled to the third output terminal and is used to be coupled to the first end of the load circuit, the second output terminal is coupled to the ground terminal and is used to be coupled to the second end of the load circuit.

5. The power supply regulation circuit according to claim 3, wherein the three-phase main power circuit includes an input capacitor, a first power switch, a second power switch, a third power switch, a fourth power switch, a fifth power switch, and a sixth power switch. 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. The primary winding includes a primary winding of phase A, a primary winding of phase B, and a primary winding of phase C; Among them, 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 be coupled to 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 be coupled to 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 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 first resonant inductor. The second end of the second resonant capacitor is coupled to the first end of the second resonant inductor. The second end of the third resonant capacitor is coupled to the first end of the third resonant inductor. The second end of the first resonant inductor is coupled to the first end of the primary winding of phase A. The second end of the second resonant inductor is coupled to the first end of the primary winding of phase B. The second end of the third resonant inductor is coupled to the first end of the primary winding of phase C. The second end of the primary winding of phase A is coupled to the second end of the primary winding of phase B and the second end of the primary winding of phase C. The primary winding of phase A is coupled to the first secondary winding of phase A and the second secondary winding of phase A. The primary winding of phase B is coupled to the first secondary winding of phase B and the second secondary winding of phase B. The primary winding of phase C is coupled to the first secondary winding of phase C and the second secondary winding of phase C.

6. The power supply regulation circuit according to any one of claims 2-5, characterized in that the first capacitor sub-circuit includes at least two first capacitor groups connected in series with each other, and each first capacitor group includes at least two first capacitor elements connected in parallel with each other; the second capacitor sub-circuit includes at least two second capacitor groups connected in series with each other, and each second capacitor group includes at least two second capacitor elements connected in parallel with each other.

7. The power supply regulation circuit according to claim 6, characterized in that the number of the first capacitor elements in the first capacitor sub-circuit is greater than the number of the second capacitor elements in the second capacitor sub-circuit.

8. The power supply regulation circuit according to any one of claims 1-5, characterized in that the power supply regulation circuit further includes a control circuit, the control circuit is coupled to the three-phase main power circuit and the Y-type three-phase rectifier circuit, and the control circuit samples and obtains the second DC signal in the Y-type three-phase rectifier circuit to adjust the signal frequency of the set control signal based on the second DC signal; the three-phase main power circuit is used to receive the set control signal sent by the control circuit and adjust the first AC signal based on the set control signal, so that the three-phase resonant circuit operates at the resonant frequency.

9. The power supply regulation circuit according to claim 8, wherein the power supply regulation circuit further includes a three-phase current sampling circuit, the three-phase current sampling circuit is coupled to the three-phase resonant circuit and the control circuit, and the three-phase current sampling circuit samples and obtains a first alternating current signal in the three-phase resonant circuit; the control circuit is configured to receive the first alternating current signal sent by the three-phase current sampling circuit, and when the first alternating current signal is higher than a second threshold range, stop sending the set control signal to the three-phase main power circuit.

10. An electronic device, characterized in that, The electronic device includes a housing and a power supply regulation circuit connected to the housing; wherein, the power supply regulation circuit is the power supply regulation circuit according to any one of claims 1-9.

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