Power supply circuit and power supply device

Abstract

The present application relates to a power supply circuit and a power supply device, the power supply circuit including an input circuit (100) configured to modulate an input voltage to a first operating voltage and a second operating voltage, a low voltage circuit (200) configured to generate a first output voltage based on the first operating voltage, a high voltage circuit (300) configured to generate a second output voltage based on the second operating voltage, an isolation circuit (400) connected to the high voltage circuit and the low voltage circuit to output a first output voltage, and configured to isolate the low voltage circuit and a second output voltage higher than a predetermined isolation voltage based on a predetermined isolation voltage when the high voltage circuit outputs a second output voltage, and a control circuit (500) connected to the high voltage circuit and the low voltage circuit to control the high voltage circuit and the low voltage circuit to generate the first output voltage and the second output voltage, respectively. The present application also realizes that the output of the power supply circuit can be seamlessly switched from the first output voltage to the second output voltage while avoiding the second output voltage from damaging the low voltage circuit.

Description

[Technical Field]

[0001] This application claims priority from a Chinese patent application filed on January 20, 2022, with the Patent Office of the State Intellectual Property Office of the People's Republic of China, bearing application number 202210066078.8 and entitled "Power Supply Circuit and Power Supply Device," the entire contents of which are incorporated herein by reference.

[0002] The present application belongs to the technical field of power supply circuits, and in particular to a power supply circuit and a power supply device. [Background technology]

[0003] Currently, a conventional power supply is a device (or system) that supplies power to an electric circuit or electronic electrical equipment. According to the output power format of the power supply, it is generally divided into DC power supply and AC power supply, according to the output voltage level, it is generally divided into low voltage power supply and high voltage power supply, and according to the application field (or electrical equipment), it is divided into communication power supply, aviation power supply, military special power supply, etc.

[0004] The output voltage or current waveform of an AC power supply is generally an alternating positive and negative sine wave, among which high frequency AC power supplies (also known as high frequency inverter power supplies) are becoming increasingly popular. The output of conventional high frequency AC power supplies is a high frequency sine wave, and they generally come in two types: switching mode and linear amplification mode. Linear amplification mode has a wide operating bandwidth but often suffers from low operating efficiency, while switching mode uses an inverter circuit and a power electronic switching device, resulting in high operating efficiency.

[0005] In addition to high-frequency AC power supplies that output sine waves, other high-frequency AC power supplies that can output square waves have also become increasingly important in recent years, especially high-voltage pulse power supplies that output high-voltage square waves. High-voltage square-wave pulse power supplies are essentially high-frequency AC power supplies, but their output waveforms are square waves or pulse voltages, and the output voltage is generally required to be relatively high. Due to different technological implementation paths, it is difficult to simultaneously generate sine waves and high-voltage square waves in the same circuit or system.

[0006] Conventional system solutions using two types of power sources achieve output of different waveform energy formats through integration and communication control, but this solution is a system integration solution, where each power source is an independent system with an independent controller, and a system-level integrated controller is required to implement communication between the integrated controller and the two power sources. In addition to the problems of complex system configuration, large volume, and high cost, switching between the output of the two energy formats generally requires a relay switching method, which causes problems such as long switching times and inflexible control. Summary of the Invention [Problem to be solved by the invention]

[0007] SUMMARY OF THE INVENTION An object of the present invention is to provide a power supply circuit and a power supply device that solve the problems of high cost and inconvenient switching of output signals that exist in conventional power supplies that can output various waveforms. [Means for solving the problem]

[0008] In order to achieve the above object, a first aspect of the present application provides a power supply comprising: an input circuit configured to modulate an input voltage into a first operating voltage and a second operating voltage and output the modulated voltages; a low-voltage circuit connected to the input circuit and configured to generate and output a first output voltage based on the first operating voltage; a high-voltage circuit connected to the input circuit and configured to generate and output a second output voltage based on the second operating voltage; an isolation circuit connected to the high-voltage circuit and the low-voltage circuit and configured to output the first output voltage, and when the high-voltage circuit outputs the second output voltage, to isolate the low-voltage circuit from the second output voltage higher than the predetermined isolation voltage based on a predetermined isolation voltage; Controlling the high voltage circuit and the low voltage circuit to generate the second output voltage and the first output voltage, respectively and a control circuit configured to:

[0009] In one embodiment, the low-voltage circuit includes a resonant module, the resonant module including a first switching transistor, a second switching transistor and a resonant unit, a first conductive end of the first switching transistor is connected to the input circuit to receive the first operating voltage, a controlled end of the first switching transistor is connected to the control circuit, a second conductive end of the first switching transistor is connected to the first conductive end of the second switching transistor and connected to the resonant module, a controlled end of the second switching transistor is connected to the control circuit, a second conductive end of the second switching transistor is connected to a ground terminal, and an output terminal of the resonant unit is connected to the isolation circuit to output a resonant voltage.

[0010] In one embodiment, the low-voltage circuit further includes a reference voltage module, the reference voltage module including a third switching transistor and a fourth switching transistor, a first conductive end of the third switching transistor connected to the input circuit to receive the first operating voltage, a controlled end of the third switching transistor connected to the control circuit, a second conductive end of the third switching transistor connected to the first conductive end of the fourth switching transistor connected to the isolation circuit, a controlled end of the fourth switching transistor connected to the control circuit, and a second conductive end of the fourth switching transistor connected to the ground, the reference voltage module outputs a differential-mode reference voltage, the differential-mode reference voltage is combined with the resonant voltage to generate a differential-mode sinusoidal voltage, and the differential-mode sinusoidal voltage is the first output voltage.

[0011] In one embodiment, the high voltage circuit includes a first switching module, a second switching module, a third switching module, and a fourth switching module, a first end of the first switching module connected to the input circuit to receive the second operating voltage, a second end of the first switching module connected to the first end of the second switching module and connected to the isolation circuit, a second end of the second switching module connected to ground, a first end of the third switching module connected to the input circuit to receive the second operating voltage, a second end of the third switching module connected to the first end of the fourth switching module and connected to the isolation circuit, and a second end of the fourth switching module connected to ground, and the high voltage circuit outputs a differential mode square wave voltage, and the differential mode square wave voltage is the second output voltage.

[0012] In one embodiment, the isolation circuit includes a first isolation module and a second isolation module, the voltage input terminal of the first isolation module is connected to the resonant module, the voltage input terminal of the second isolation module is connected to the reference voltage module, and the voltage output terminal of the first isolation module and the voltage output terminal of the second isolation module are both connected to the high voltage circuit.

[0013] In one embodiment, the first isolation module includes a first voltage dividing resistor, a second voltage dividing resistor, a first unidirectional conductor, a second unidirectional conductor, a third unidirectional conductor, and a fourth unidirectional conductor, a first end of the first voltage dividing resistor is connected to a protection voltage terminal, and the protection voltage terminal outputs a protection voltage corresponding to the predetermined isolation voltage, a second end of the first voltage dividing resistor is connected to a positive electrode of the first unidirectional conductor and a positive electrode of the third unidirectional conductor, respectively, a negative electrode of the first unidirectional conductor is connected to a positive electrode of the second unidirectional conductor, and the negative electrode of the second unidirectional conductor is connected to the resonant module, and the negative electrode of the third one-way conductor is connected to the positive electrode of the fourth one-way conductor and connected to the high-voltage circuit; the negative electrode of the fourth one-way conductor is connected to the first end of the second voltage divider resistor, and the second end of the second voltage divider resistor is connected to the ground end; the second isolation module has the same structure as the first isolation module, and the first isolation module is configured to output the resonant voltage and isolate the resonant module from the high-voltage circuit; and the second isolation module is configured to output the differential-mode reference voltage and isolate the reference voltage module from the high-voltage circuit.

[0014] In one embodiment, the control circuit includes a control unit and a plurality of photocouplers, and the control unit is connected to the high-voltage circuit and the low-voltage circuit via the plurality of photocouplers, respectively, and controls generation of the second output voltage and the first output voltage.

[0015] In one embodiment, the input circuit includes a rectifier module, and a first voltage regulation module and a second voltage regulation module connected to the rectifier module, wherein the rectifier module rectifies the input voltage into an input DC voltage, the first voltage regulation module converts the input DC voltage into the first operating voltage, and the second voltage regulation module converts the input DC voltage into the second operating voltage.

[0016] In one embodiment, the control unit is connected to the first voltage regulation module, the second voltage regulation module and the isolation circuit, respectively, and the control unit sets the first operating voltage, the second operating voltage and the predetermined isolation voltage, respectively.

[0017] A second aspect of the present application provides a power supply device including the above power supply circuit. [Effects of the Invention]

[0018] The beneficial effects of the power supply circuit and power supply device provided by the present application are that the low-voltage circuit in the power supply circuit can output a first output voltage through an isolation circuit, and when a second output voltage is output, the isolation circuit can isolate the second output voltage higher than the predetermined isolation voltage from the low-voltage circuit based on a predetermined isolation voltage, thereby preventing the second output voltage from damaging the low-voltage circuit and also realizing seamless switching of the output of the power supply circuit from the first output voltage to the second output voltage. [Brief explanation of the drawings]

[0019] In order to more clearly explain the technical solutions in the embodiments of the present application, the following will briefly describe the drawings that need to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings based on these drawings without any creative work.

[0020] [Figure 1] 1 is a block diagram showing the principle of a power supply circuit according to a first embodiment of the present invention; [Figure 2] FIG. 2 is a circuit schematic diagram of the low-voltage circuit shown in FIG. [Figure 3] FIG. 2 is a circuit schematic diagram of the high-voltage circuit shown in FIG. [Figure 4] 2 is another schematic circuit diagram of the high-voltage circuit shown in FIG. 1. FIG. [Figure 5] FIG. 2 is a circuit schematic diagram of the separation circuit shown in FIG. [Figure 6] FIG. 2 is another block diagram illustrating the principle of the power supply circuit according to the first embodiment of the present application. [Explanation of symbols]

[0021] 100: Input circuit, 110: Rectification module, 120: First voltage regulation module, 130: Second voltage regulation module, 200: Low voltage circuit, 210: Resonance module, 211: Resonance unit, 220: Reference voltage module, 300: High voltage circuit, 310: First switching module, 320: Second switching module, 330: Third switching module, 340: Fourth switching module, 400: Isolation circuit, 410: First isolation module, 411: First unidirectional conductor, 412: Second unidirectional conductor, 413: Third unidirectional conductor, 414: Fourth unidirectional conductor, 420: Second isolation module, 500: Control circuit. DETAILED DESCRIPTION OF THE INVENTION

[0022] In order to clarify the technical problems, technical solutions, and beneficial effects of the present application, the present application will be described in more detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are for illustrative purposes only and are not intended to limit the present application.

[0023] It should be noted that when an element is referred to as being "fixed" or "mounted" to another element, it may be mounted directly or indirectly to the other element. When an element is referred to as being "connected" to another element, it may be directly connected to the other element or indirectly connected to the other element.

[0024] Additionally, the terms "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying relative importance or the number of technical features shown. Thus, a feature qualified as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, "plurality" means two or more, unless otherwise specified.

[0025] FIG. 1 is a block diagram showing the principle of a power supply circuit according to a first embodiment of the present invention. For convenience of explanation, only the parts related to this embodiment are shown, and the details are as follows.

[0026] The power supply circuit includes an input circuit 100, a low-voltage circuit 200, a high-voltage circuit 300, an isolation circuit 400, and a control circuit 500. The input circuit 100 is configured to modulate an input voltage into a first operating voltage and a second operating voltage and output the modulated voltages. The low-voltage circuit 200 is connected to the input circuit 100 and configured to generate and output a first output voltage based on the first operating voltage. The high-voltage circuit 300 is connected to the input circuit 100 and configured to generate and output a second output voltage based on the second operating voltage. The isolation circuit 400 is connected to the high-voltage circuit 300 and the low-voltage circuit 200 and configured to output the first output voltage. When the high-voltage circuit 300 outputs the second output voltage, the isolation circuit 400 controls the low-voltage circuit 200 based on a predetermined isolation voltage. of, A second output voltage higher than the predetermined isolation voltage from The control circuit 500 is connected to the high voltage circuit 300 and the low voltage circuit 200, and the control circuit 500 is configured to control the high voltage circuit 300 and the low voltage circuit 200 to generate the second output voltage and the first output voltage, respectively, where the predetermined isolation voltage is greater than the first output voltage and less than the second output voltage.

[0027] In addition, since the second operating voltage is much greater than the first operating voltage and the second output voltage is much greater than the first output voltage, when outputting the first output voltage, it is necessary to switch to outputting the second output voltage. In a conventional circuit, this requires a long switching time, making it difficult to achieve seamless switching. In this embodiment, when switching from the first output voltage to the second output voltage, the isolation circuit 400 receives the second output voltage and isolates the second output voltage, which is greater than a predetermined isolation voltage, from the low-voltage circuit 200, preventing the second output voltage from being transmitted to the low-voltage circuit 200. Furthermore, it is not necessary to consider whether the low-voltage circuit 200 is turned off, and seamless switching from the first output voltage to the second output voltage can be achieved.

[0028] As shown in FIG. 2, in this embodiment, the low-voltage circuit 200 includes a resonant module 210, which includes a first switching transistor Q1, a second switching transistor Q2, and a resonant unit 211. A first conductive end of the first switching transistor Q1 is connected to the input circuit 100 to receive a first operating voltage, a controlled end of the first switching transistor Q1 is connected to the control circuit 500, and a second conductive end of the first switching transistor Q1 is connected to the first conductive end of the second switching transistor Q2. and The resonant unit 211 is connected to the resonant unit 211, the controlled end of the second switching transistor Q2 is connected to the control circuit 500, the second conductive end of the second switching transistor Q2 is connected to the ground end, and the output end of the resonant unit 211 is connected to the isolation circuit 400 to output a resonant voltage, and the first output voltage includes the resonant voltage. By controlling the on / off of the first switching transistor Q1 and the second switching transistor Q2, a resonant voltage having oscillation can be output. Specifically, the resonant unit 211 includes a resonant capacitor C1 and a resonant inductor L1, a first end of the resonant capacitor C1 is connected to the second conductive end of the first switching transistor Q1, a second end of the resonant capacitor C1 is connected to the first end of the resonant inductor L1, and the second end of the resonant inductor L1 is connected to the isolation circuit 400.

[0029] As shown in FIG. 2, in this embodiment, the low-voltage circuit 200 further includes a reference voltage module 220. The reference voltage module 220 includes a third switching transistor Q3 and a fourth switching transistor Q4. A first conductive end of the third switching transistor Q3 is connected to the input circuit 100 to receive a first operating voltage. A controlled end of the third switching transistor Q3 is connected to the control circuit 500. A second conductive end of the third switching transistor Q3 is connected to the first conductive end of the fourth switching transistor Q4. and The fourth switching transistor Q4 has a controlled end connected to the isolation circuit 400, a second conducting end connected to the control circuit 500, and a reference voltage module 220 for outputting a differential-mode reference voltage for combining with the resonant voltage to generate a differential-mode sinusoidal voltage, the differential-mode sinusoidal voltage being the first output voltage, both of which are smaller than the predetermined isolation voltage.

[0030] The first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, and the fourth switching transistor Q4 are all MOS transistors. Specifically, the first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, and the fourth switching transistor Q4 may all be NMOS transistors. The first conductive ends of the first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, and the fourth switching transistor Q4 correspond to the drains of the NMOS transistors. The second conductive ends of the first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, and the fourth switching transistor Q4 correspond to the sources of the NMOS transistors. The controlled ends of the first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, and the fourth switching transistor Q4 correspond to the gates of the NMOS transistors.

[0031] The reference voltage module 220 generates a differential-mode reference voltage, which can be combined with the resonant voltage to generate a differential-mode sinusoidal voltage having a positive phase and a negative phase. Specifically, under the control of the control circuit 500, when the first switching transistor Q1 is turned on, the fourth switching transistor Q4 is turned on, the second switching transistor Q2 is turned off, and the third switching transistor Q3 is turned off, the low-voltage circuit 200 outputs a differential-mode sinusoidal voltage with a positive phase; when the first switching transistor Q1 is turned on, the fourth switching transistor Q4 is turned off, the second switching transistor Q2 is turned on, and the third switching transistor Q3 is turned on, the low-voltage circuit 200 outputs a differential-mode sinusoidal voltage with a negative phase.

[0032] As shown in FIG. 3 , in this embodiment, the high-voltage circuit 300 includes a first switching module 310, a second switching module 320, a third switching module 330, and a fourth switching module 340. A first end of the first switching module 310 is connected to the input circuit 100 to receive a second operating voltage, and a second end of the first switching module 310 is connected to the first end of the second switching module 320. and The high-voltage circuit 300 is used to output a differential-mode square wave voltage. The high-voltage circuit 300 has a first output terminal OUT1 connected to the first terminal of the second switching module 320, a second terminal of the second switching module 320 connected to the ground terminal, a first terminal of the third switching module 330 connected to the input circuit 100 to receive the second operating voltage, a second terminal of the third switching module 330 connected to the first terminal of the fourth switching module 340 to connect to the second output terminal OUT2 of the isolation circuit 400, and a second terminal of the fourth switching module 340 connected to the ground terminal.

[0033] Under the control of the control circuit 500, when the first switching module 310 and the fourth switching module 340 are turned on and the second switching module 320 and the third switching module 330 are turned off, the high voltage circuit 300 outputs a high-level differential mode square wave voltage; when the first switching module 310 and the fourth switching module 340 are turned off and the second switching module 320 and the third switching module 330 are turned on, the high voltage circuit 300 outputs a low-level differential mode square wave voltage, which is the second output voltage.

[0034] Among them, the first switching module 310, the second switching module 320, the third switching module 330 and the fourth switching module 340 are all MOS transistors. Specifically, the first switching module 310, the second switching module 320, the third switching module 330 and the fourth switching module 340 may all be NMOS transistors, with the first conductive ends of the first switching module 310, the second switching module 320, the third switching module 330 and the fourth switching module 340 corresponding to the drains of the NMOS transistors, the second conductive ends of the first switching module 310, the second switching module 320, the third switching module 330 and the fourth switching module 340 corresponding to the sources of the NMOS transistors, and the controlled ends of the first switching module 310, the second switching module 320, the third switching module 330 and the fourth switching module 340 corresponding to the gates of the NMOS transistors.

[0035] As shown in FIG. 4, the first switching module 310, the second switching module 320, the third switching module 330, and the fourth switching module 340 may each include multiple MOS transistors connected in series to distribute voltage.

[0036] As shown in FIG. 5 , in this embodiment, the separation circuit 400 includes a first separation module 410 and a second separation module 420, and the voltage input terminal of the first separation module 410 and the voltage input terminal of the second separation module 420 are both connected to the low-voltage circuit 200, and the voltage output terminal of the first separation module 410 and the voltage output terminal of the second separation module 420 are both connected to the high-voltage circuit 300.

[0037] The first isolation module 410 includes a first voltage dividing resistor R1, a second voltage dividing resistor R2, a first unidirectional conductor 411, a second unidirectional conductor 412, a third unidirectional conductor 413, and a fourth unidirectional conductor 414. A first end of the first voltage dividing resistor R1 is connected to a protection voltage terminal V1, which is used to output a protection voltage having a corresponding relationship with a predetermined isolation voltage. A second end of the first voltage dividing resistor R1 is connected to the positive electrode of the first unidirectional conductor 411 and the positive electrode of the third unidirectional conductor 413, respectively. The negative electrode of the first unidirectional conductor 411 is connected to the positive electrode of the second unidirectional conductor 412. and The negative terminal of the second one-way conductor 412 is connected to the first end of the second voltage dividing resistor R2, and the negative terminal of the third one-way conductor 413 is connected to the positive terminal of the fourth one-way conductor 414. and The fourth one-way conductor 414 is connected to the high-voltage circuit 300. The negative electrode of the fourth one-way conductor 414 is connected to the first end of the second voltage dividing resistor R2. The second end of the second voltage dividing resistor R2 is connected to the ground. The negative electrode of the first one-way conductor 411 is the voltage input end of the first separation module 410. The negative electrode of the third one-way conductor 413 is the voltage output end of the first separation module 410 (the first output end OUT1 of the separation circuit 400).

[0038] As shown in FIG. 3-5, the second isolation module 420 has the same structure as the first isolation module 410. It is disposed between the reference voltage module 220 and the second end of the third switching module 330 of the high voltage circuit 300. The voltage output terminal of the second isolation module 420 (the second output terminal OUT2 of the isolation circuit 400) is connected to the second end of the third switching module 330 of the high voltage circuit 300. The voltage output terminal of the first isolation module 410 is used to output the resonant voltage. The first isolation module 410 is connected to the resonant module 210. of High Voltage Circuit 300 from The voltage output terminal of the second isolation module 420 is used to output a differential mode reference voltage, and the second isolation module 420 is used to isolate the reference voltage module 220. of High Voltage Circuit 300 from It is used to separate.

[0039] Specifically, the first one-way conductor 411, the second one-way conductor 412, the third one-way conductor 413, and the fourth one-way conductor 414 may each be a single diode or multiple diodes connected end-to-end. In this embodiment, each one-way conductor includes two diodes connected end-to-end. In this embodiment, the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 have the same resistance value, so the predetermined isolation voltage is half the protection voltage. When the ratio of the resistance values ​​of the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 changes, the magnitude relationship between the predetermined isolation voltage and the protection voltage changes accordingly.

[0040] Taking the first separation module 410 as an example, in this embodiment, when the protection voltage is 500V, the predetermined separation voltages at the voltage input terminal and the voltage output terminal of the first separation module 410 are both 250V through the voltage division between the first voltage dividing resistor R1 and the second voltage dividing resistor R2. After the resonant voltage is transmitted to the first separation module 410, the voltage input terminal of the first separation module 410 is pulled down to the corresponding resonant voltage. At this time, the second unidirectional conductive device 412 is conductive, and the voltage at the first terminal of the second voltage dividing resistor R2 is also pulled down to the resonant voltage. At the same time, the fourth unidirectional conductive device 414 is also conductive, and the voltage at the voltage output terminal of the first separation module 410 becomes the resonant voltage, thereby realizing lossless output for the resonant voltage. At this time, when the high amplitude voltage output from the second terminal of the first switching module 310 is transmitted to the first separation module 410, the fourth one-way conduction device 414 2 Voltage dividing resistor R 2The second isolation circuit 400 increases the voltage at the first end of the first switching module 310, and at this time, the voltage at the negative pole of the second unidirectional conduction device 412 is greater than the voltage at the positive pole of the second unidirectional conduction device 412, turning off the second unidirectional conduction device 412 and achieving isolation between the resonant module 210 and the second output voltage. Even though the resonant module 210 is not yet turned off, seamless switching from the resonant voltage to the voltage output by the second end of the first switching module 310 is achieved. Similarly, the second isolation circuit 400 can also achieve isolation between the differential-mode reference module 210 and the second output voltage, and seamless switching from the differential-mode reference voltage to the voltage output by the second end of the first switching module 310. Finally, seamless switching from the first output voltage to the second output voltage is achieved.

[0041] In this embodiment, the control circuit 500 includes a control unit and a plurality of photocouplers. The control unit is connected to the high-voltage circuit 300 and the low-voltage circuit 200 via the plurality of photocouplers, respectively, and controls the generation of the second output voltage and the first output voltage. Specifically, the control unit is connected to the gates of the MOS transistors in the high-voltage circuit 300 and the low-voltage circuit 200 via the plurality of photocouplers, respectively, and controls the on / off of each MOS transistor in the high-voltage circuit 300 and the low-voltage circuit 200. The control unit may be a single-chip microcomputer or a microprocessor.

[0042] In another embodiment, different from the present embodiment, the isolation circuit 400 includes an isolation switch, which may be a conventional high-voltage relay or a high-voltage changeover switch, with a controlled end connected to the control circuit 500, a first conductive end connected to the low-voltage circuit 200, and a second conductive end connected to the high-voltage circuit 300. The isolation switch can turn on and off the low-voltage circuit 200 and the high-voltage circuit 300 under the control of the control circuit 500. For example, the control circuit can turn off the isolation switch while the high-voltage circuit 300 outputs the second output voltage, so as to protect the low-voltage circuit 200. This embodiment will not be described in detail.

[0043] 6, in this embodiment, the input circuit 100 includes a rectifier module 110, and a first voltage regulating module 120 and a second voltage regulating module 130 connected to the rectifier module 110. The rectifier module 110 rectifies the input voltage into an input DC voltage, the first voltage regulating module 120 converts the input DC voltage into a first operating voltage, and the second voltage regulating module 130 converts the input DC voltage into a second operating voltage. The rectifier module 110 may be a switching power supply topology module, the first voltage regulating module 120 may be a boost-buck topology module, and the second voltage regulating module 130 may be a flyback-boost module.

[0044] As shown in FIG. 6, in this embodiment, the control unit is respectively connected to the first voltage regulating module 120, the second voltage regulating module 130 and the isolation circuit 400, and the control unit respectively sets the first operating voltage, the second operating voltage and the predetermined isolation voltage.

[0045] A second embodiment of the present application provides a power supply device including the above-mentioned power supply circuit, and the power supply device may be an electric energy drive device, specifically, a medical equipment drive device, and this embodiment does not limit the type of power supply device.

[0046] For simplicity's sake, the above-described division of each functional unit or module is merely an example. In actual applications, the above functions can be assigned to different functional units or modules as needed. It will be apparent to those skilled in the art that the internal structure of the above-described device can be divided into different functional units or modules to achieve all or part of the above-described functions. The functional units and modules in the embodiments may be integrated into a single processing unit, each unit may exist physically independently, or two or more units may be integrated into a single unit. The integrated unit may be implemented in the form of hardware or software functional units. Furthermore, the specific names of the functional units and modules are used only to distinguish them from one another and do not limit the scope of protection of the present application. For the specific operational processes of the units and modules in the above-described system, reference may be made to the corresponding processes in the method embodiments; further description is omitted here.

[0047] In the above embodiments, the descriptions of each embodiment are biased, and for parts that are not detailed or described in one embodiment, reference can be made to the relevant descriptions of other embodiments.

[0048] The above-mentioned examples are only for explaining the technical solutions of the present application, and are not limiting thereof. Although the present application has been described in detail with reference to the above examples, those skilled in the art may still modify the technical solutions described in the above examples or make equivalent substitutions for some of the technical features therein, and it should be understood that these modifications or substitutions will not deviate from the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the examples of the present application, and all of them should be included in the protection scope of the present application.

Claims

1. an input circuit configured to modulate an input voltage into a first operating voltage and a second operating voltage and output the modulated voltage; a low-voltage circuit connected to the input circuit and configured to generate and output a first output voltage based on the first operating voltage; a high voltage circuit connected to the input circuit and configured to generate and output a second output voltage based on the second operating voltage; an isolation circuit connected to the high voltage circuit and the low voltage circuit to output the first output voltage, and configured to isolate the low voltage circuit from the second output voltage higher than a predetermined isolation voltage when the high voltage circuit outputs the second output voltage; a control circuit coupled to the high voltage circuit and the low voltage circuit and configured to control the high voltage circuit and the low voltage circuit to generate the second output voltage and the first output voltage, respectively. A power supply circuit characterized by:

2. the low-voltage circuit includes a resonant module, the resonant module including a first switching transistor, a second switching transistor, and a resonant unit, a first conductive end of the first switching transistor is connected to the input circuit to receive the first operating voltage, a controlled end of the first switching transistor is connected to the control circuit, a second conductive end of the first switching transistor is connected to the first conductive end of the second switching transistor and the resonant unit, a controlled end of the second switching transistor is connected to the control circuit, and a second conductive end of the second switching transistor is connected to a ground terminal; The output terminal of the resonant unit is connected to the isolation circuit to output a resonant voltage.

2. The power supply circuit according to claim 1.

3. the low-voltage circuit further includes a reference voltage module, the reference voltage module including a third switching transistor and a fourth switching transistor, a first conductive end of the third switching transistor connected to the input circuit to receive the first operating voltage, a controlled end of the third switching transistor connected to the control circuit, a second conductive end of the third switching transistor connected to the first conductive end of the fourth switching transistor and the isolation circuit, a controlled end of the fourth switching transistor connected to the control circuit, and a second conductive end of the fourth switching transistor connected to the ground; The reference voltage module outputs a differential mode reference voltage, the differential mode reference voltage being combined with a resonant voltage to generate a differential mode sinusoidal voltage, the differential mode sinusoidal voltage being the first output voltage.

3. The power supply circuit according to claim 2.

4. The first switching transistor, the second switching transistor, the third switching transistor, and the fourth switching transistor are all MOS transistors.

4. The power supply circuit according to claim 3.

5. The first switching transistor, the second switching transistor, the third switching transistor, and the fourth switching transistor are all NMOS transistors.

5. The power supply circuit according to claim 4.

6. the high voltage circuit includes a first switching module, a second switching module, a third switching module, and a fourth switching module; a first end of the first switching module is connected to the input circuit to receive the second operating voltage, a second end of the first switching module is connected to the first end of the second switching module and the isolation circuit, and a second end of the second switching module is connected to a ground terminal; a first end of the third switching module is connected to the input circuit to receive the second operating voltage, a second end of the third switching module is connected to the first end of the fourth switching module and the isolation circuit, and a second end of the fourth switching module is connected to the ground terminal; The high voltage circuit outputs a differential mode square wave voltage, the differential mode square wave voltage being the second output voltage.

2. The power supply circuit according to claim 1.

7. The first switching module, the second switching module, the third switching module, and the fourth switching module are all MOS transistors.

7. The power supply circuit according to claim 6.

8. The first switching module, the second switching module, the third switching module, and the fourth switching module are all NMOS transistors.

8. The power supply circuit according to claim 7.

9. The isolation circuit includes a first isolation module and a second isolation module, the voltage input terminal of the first isolation module is connected to the resonant module, the voltage input terminal of the second isolation module is connected to the reference voltage module, and the voltage output terminal of the first isolation module and the voltage output terminal of the second isolation module are both connected to the high voltage circuit.

4. The power supply circuit according to claim 3.

10. the first isolation module includes a first voltage dividing resistor, a second voltage dividing resistor, a first one-way conductor, a second one-way conductor, a third one-way conductor, and a fourth one-way conductor; a first end of the first voltage-dividing resistor is connected to a protection voltage terminal, the protection voltage terminal being configured to output a protection voltage corresponding to the predetermined isolation voltage; a second end of the first voltage-dividing resistor is connected to a positive electrode of the first one-way conductor and a positive electrode of a third one-way conductor, respectively; a negative electrode of the first one-way conductor is connected to a positive electrode of the second one-way conductor and a resonant module; a negative electrode of the second one-way conductor is connected to a first end of the second voltage-dividing resistor; a negative electrode of the third one-way conductor is connected to a positive electrode of the fourth one-way conductor and the high-voltage circuit; a negative electrode of the fourth one-way conductor is connected to a first end of the second voltage-dividing resistor; and a second end of the second voltage-dividing resistor is connected to the ground terminal; The second isolation module has the same structure as the first isolation module, the first isolation module being configured to output the resonant voltage and isolate the resonant module from the high voltage circuit, and the second isolation module being configured to output the differential mode reference voltage and isolate the reference voltage module from the high voltage circuit.

10. The power supply circuit according to claim 9.

11. The control circuit includes a control unit and a plurality of photocouplers, and the control unit is connected to the high-voltage circuit and the low-voltage circuit via the plurality of photocouplers, respectively, and is configured to control generation of the second output voltage and the first output voltage.

2. The power supply circuit according to claim 1.

12. The input circuit includes a rectifier module, and a first voltage regulation module and a second voltage regulation module connected to the rectifier module, the rectifier module rectifying the input voltage into an input DC voltage, the first voltage regulation module converting the input DC voltage into the first operating voltage, and the second voltage regulation module converting the input DC voltage into the second operating voltage.

12. The power supply circuit according to claim 11.

13. The control unit is connected to the first voltage regulation module, the second voltage regulation module, and the isolation circuit, respectively, and is configured to set the first operating voltage, the second operating voltage, and the predetermined isolation voltage, respectively.

13. The power supply circuit according to claim 12.

14. The first output voltage is smaller than the second output voltage. The power supply circuit according to any one of claims 1 to 13.

15. A power supply device comprising the power supply circuit according to claim 14.

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