Power supply circuits and power supply devices

Abstract

A power supply circuit and a power supply device are disclosed. The power supply circuit includes: an input circuit configured to modulate an input voltage into a first operating voltage and a second operating voltage; a low-voltage circuit configured to generate a first output voltage based on the first operating voltage; a high-voltage circuit configured to generate a second output voltage based on the second operating voltage; an isolation circuit connected to the high-voltage circuit and the low-voltage circuit for outputting the first output voltage and configured to isolate the low-voltage circuit and the second output voltage higher than the preset isolation voltage according to a preset isolation voltage when the high-voltage circuit outputs the second output voltage; and a control circuit connected to the high-voltage circuit and the low-voltage circuit, configured to control the high-voltage circuit and the low-voltage circuit to generate the first output voltage and the second output voltage, respectively. This application can prevent the second output voltage from damaging the low-voltage circuit and also achieves seamless switching of the power supply circuit output from the first output voltage to the second output voltage.

Description

Technical Field

[0001] This application belongs to the field of power supply circuit technology, and particularly relates to a power supply circuit and a power supply device. Background Technology

[0002] Currently, a traditional power supply is a device (or system) that provides electrical energy to circuits or electronic and electrical equipment. Based on the form of the electrical energy output, power supplies can generally be divided into DC power supplies and AC power supplies; based on the output voltage level, they can generally be divided into low-voltage power supplies and high-voltage power supplies; and based on the application field (or electrical equipment), they can also be divided into communication power supplies, aviation power supplies, military special power supplies, etc.

[0003] For AC power supplies, the output voltage or current waveform is generally an alternating positive and negative sine wave. High-frequency AC power supplies (also known as high-frequency inverters) are increasingly widely used. Traditional high-frequency AC power supplies output a high-frequency sine wave, generally in two modes: switching mode and linear amplification mode. Linear amplification mode has a wider operating bandwidth but often lower efficiency; switching mode uses inverter circuits and power electronic switching devices, resulting in higher efficiency.

[0004] Besides high-frequency AC power supplies that output sine waves, another type of high-frequency AC power supply capable of outputting square waves has gained increasing attention in recent years, especially high-voltage pulse power supplies that output high-voltage square waves. High-voltage square wave pulse power supplies are essentially also a type of high-frequency AC power supply, but their output waveform is a square wave or pulse voltage, and the output voltage requirements are often relatively high. Due to different technical implementation paths, it is difficult to simultaneously generate sine waves and high-voltage square waves in the same circuit or system.

[0005] Existing system solutions employing two power supplies to achieve different waveform energy outputs through integration and communication control. However, this approach is a system integration solution, where each power supply is an independent system with its own controller. Furthermore, a system-level master controller is required to enable communication between the master controller and the two power supplies. Besides the problems of complex system structure, large size, and high cost, the switching between the two energy output forms typically uses relays, resulting in long switching times and inflexible control. Summary of the Invention

[0006] The purpose of this application is to provide a power supply circuit and power supply device, which aims to solve the problems of high cost and inconvenient output signal switching of traditional power supplies capable of outputting multiple waveforms.

[0007] A first aspect of this application provides a power supply circuit, comprising: an input circuit configured to modulate an input voltage into a first operating voltage and a second operating voltage and output it; a low-voltage circuit connected to the input circuit, configured to generate and output a first output voltage based on the first operating voltage; a high-voltage circuit connected to the input circuit, 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, configured to output the first output voltage and, when the high-voltage circuit outputs the second output voltage, isolate the low-voltage circuit from the second output voltage, which is higher than the preset isolation voltage, according to a preset isolation voltage; and a control circuit connected to the high-voltage circuit and the low-voltage circuit, configured to control the high-voltage circuit and the low-voltage circuit to generate the first output voltage and the second output voltage, respectively.

[0008] In one embodiment, the low-voltage circuit includes a resonant module, which includes a first switching transistor, a second switching transistor, and a resonant unit. The first conducting terminal of the first switching transistor is connected to the input circuit to receive the first operating voltage. The controlled terminal of the first switching transistor is connected to the control circuit. The second conducting terminal of the first switching transistor is connected to the first conducting terminal of the second switching transistor and to the resonant module. The controlled terminal of the second switching transistor is connected to the control circuit, and the second conducting terminal of the second switching transistor is connected to ground. The output terminal of the resonant unit is connected to the isolation circuit for outputting a resonant voltage.

[0009] In one embodiment, the low-voltage circuit further includes a reference voltage module, which includes a third switch and a fourth switch. The first conducting terminal of the third switch is connected to the input circuit to receive the first operating voltage. The controlled terminal of the third switch is connected to the control circuit. The second conducting terminal of the third switch is connected to the first conducting terminal of the fourth switch and connected to the isolation circuit. The controlled terminal of the fourth switch is connected to the control circuit, and the second conducting terminal of the fourth switch is connected to ground. The reference voltage module is used to output a differential-mode reference voltage, which is used to generate a differential-mode sinusoidal voltage in combination with the resonant voltage. The differential-mode sinusoidal voltage is the first output voltage.

[0010] In one embodiment, the high-voltage circuit includes a first switch module, a second switch module, a third switch module, and a fourth switch module; a first terminal of the first switch module is connected to the input circuit to receive the second operating voltage, a second terminal of the first switch module is connected to the first terminal of the second switch module and connected to the isolation circuit, and a second terminal of the second switch module is connected to ground; a first terminal of the third switch module is connected to the input circuit to receive the second operating voltage, a second terminal of the third switch module is connected to the first terminal of the fourth switch module and connected to the isolation circuit, and a second terminal of the fourth switch module is connected to ground; the high-voltage circuit is used to output a differential-mode square wave voltage, which is the second output voltage.

[0011] 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 terminals of both the first isolation module and the second isolation module are connected to the high-voltage circuit.

[0012] In one embodiment, the first isolation module includes a first voltage divider resistor, a second voltage divider resistor, a first unidirectional conductor, a second unidirectional conductor, a third unidirectional conductor, and a fourth unidirectional conductor. The first terminal of the first voltage divider resistor is connected to a protection voltage terminal, which outputs a protection voltage corresponding to the preset isolation voltage. The second terminal of the first voltage divider resistor is connected to the positive terminals of the first and third unidirectional conductors, respectively. The negative terminal of the first unidirectional conductor is connected to the positive terminal of the second unidirectional conductor and then to the resonant module. The negative terminal of the second unidirectional conductor is connected to the first terminal of the second voltage divider resistor. The negative terminal of the third unidirectional conductor is connected to the positive terminal of the fourth unidirectional conductor and then to the high-voltage circuit. The negative terminal of the fourth unidirectional conductor is connected to the first terminal of the second voltage divider resistor. The second terminal of the second voltage divider resistor is connected to ground. The second isolation module has the same structure as the first isolation module. The first isolation module outputs the resonant voltage and isolates the resonant module and the high-voltage circuit. The second isolation module outputs the differential-mode reference voltage and isolates the reference voltage module and the high-voltage circuit.

[0013] In one embodiment, the control circuit includes a control unit and a plurality of optocouplers. The control unit is connected to the high-voltage circuit and the low-voltage circuit respectively through the plurality of optocouplers to control the generation of the second output voltage and the first output voltage.

[0014] In one embodiment, the input circuit includes a rectifier module and a first voltage regulator module and a second voltage regulator module connected to the rectifier module. The rectifier module is used to rectify the input voltage into an input DC voltage, the first voltage regulator module is used to convert the input DC voltage into the first operating voltage, and the second voltage regulator module is used to convert the input DC voltage into the second operating voltage.

[0015] In one embodiment, the control unit is connected to the first voltage regulating module, the second voltage regulating module and the isolation circuit respectively, and the control unit is used to configure the first operating voltage, the second operating voltage and the preset isolation voltage respectively.

[0016] A second aspect of this application provides a power supply device, including the power supply circuit described above.

[0017] The beneficial effects of this application embodiment compared with the prior art are as follows: the low-voltage circuit described above can output a first output voltage through an isolation circuit. When the second output voltage is output, the isolation circuit can isolate the second output voltage, which is higher than the preset isolation voltage, from the low-voltage circuit according to the preset isolation voltage, so as to avoid the second output voltage from damaging the low-voltage circuit. At the same time, it also realizes the seamless switching of the power supply circuit output from the first output voltage to the second output voltage. Attached Figure Description

[0018] Figure 1 A schematic block diagram of the power supply circuit provided in the first embodiment of this application;

[0019] Figure 2 for Figure 1 The circuit diagram of the low-voltage circuit shown is shown.

[0020] Figure 3 for Figure 1 The circuit diagram of the high-voltage circuit shown is shown.

[0021] Figure 4 for Figure 1 Another circuit diagram of the high-voltage circuit shown;

[0022] Figure 5 for Figure 1 The circuit diagram of the isolation circuit shown;

[0023] Figure 6 Another schematic diagram of the power supply circuit provided in the first embodiment of this application.

[0024] The above figures illustrate the following: 100, Input circuit; 110, Rectifier module; 120, First voltage regulation module; 130, Second voltage regulation module; 200, Low-voltage circuit; 210, Resonant module; 211, Resonant unit; 220, Reference voltage module; 300, High-voltage circuit; 310, First switch module; 320, Second switch module; 330, Third switch module; 340, Fourth switch 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 Implementation

[0025] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0026] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] Figure 1 A schematic block diagram of the power supply circuit provided in the first embodiment of this application is shown. For ease of explanation, only the parts related to this embodiment are shown, and are described in detail below:

[0029] A 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 them. The low-voltage circuit 200 is connected to the input circuit 100 and is 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 is 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 is used to output the first output voltage. The isolation circuit 400 is also configured to isolate the low-voltage circuit 200 from the second output voltage, which is higher than the preset isolation voltage, according to a preset isolation voltage, when the high-voltage circuit 300 outputs the second output voltage. The control circuit 500 is connected to the high-voltage circuit 300 and the low-voltage circuit 200, and is configured to control the high-voltage circuit 300 and the low-voltage circuit 200 to generate a first output voltage and a second output voltage, respectively. A preset isolation voltage is greater than the first output voltage and less than the second output voltage.

[0030] It should be noted that the second operating voltage is much higher than the first operating voltage, and the second output voltage is much higher than the first output voltage. When outputting the first output voltage, if it is necessary to switch to outputting the second output voltage, conventional circuits require a long switching time and it is difficult to achieve seamless switching. However, the isolation circuit 400 in this embodiment can receive the second output voltage when switching from the first output voltage to the second output voltage, and isolate the second output voltage, which is greater than the preset isolation voltage, from the low-voltage circuit 200, preventing the second output voltage from being transmitted into the low-voltage circuit 200. At the same time, it can also achieve seamless switching from the first output voltage to the second output voltage without considering whether the low-voltage circuit 200 is turned off.

[0031] like Figure 2As shown, in this embodiment, the low-voltage circuit 200 includes a resonant module 210. The resonant module 210 includes a first switch Q1, a second switch Q2, and a resonant unit 211. The first conducting terminal of the first switch Q1 is connected to the input circuit 100 to receive a first operating voltage. The controlled terminal of the first switch Q1 is connected to the control circuit 500. The second conducting terminal of the first switch Q1 is connected to the first conducting terminal of the second switch Q2 and connected to the resonant module 210. The controlled terminal of the second switch Q2 is connected to the control circuit 500, and the second conducting terminal of the second switch Q2 is connected to ground. The output terminal of the resonant unit 211 is connected to the isolation circuit 400 for outputting a resonant voltage. The first output voltage includes the resonant voltage. By controlling the switching on and off of the first switch Q1 and the second switch Q2, an output resonant voltage with oscillation can be achieved. Specifically, the resonant unit 211 includes a resonant capacitor C1 and a resonant inductor L1. The first end of the resonant capacitor C1 is connected to the second conducting end of the first switching transistor Q1, the second end of the resonant capacitor C1 is connected to the first end of the resonant inductor L1, and the second segment of the resonant inductor L1 is connected to the isolation circuit 400.

[0032] like Figure 2 As shown, in this embodiment, the low-voltage circuit 200 further includes a reference voltage module 220. The reference voltage module 220 includes a third switch Q3 and a fourth switch Q4. The first conducting terminal of the third switch Q3 is connected to the input circuit 100 to receive the first operating voltage. The controlled terminal of the third switch Q3 is connected to the control circuit 500. The second conducting terminal of the third switch Q3 is connected to the first conducting terminal of the fourth switch Q4 and connected to the isolation circuit 400. The controlled terminal of the fourth switch Q4 is connected to the control circuit 500, and the second conducting terminal of the fourth switch Q4 is connected to ground. The reference voltage module 220 is used to output a differential-mode reference voltage, which is used to generate a differential-mode sinusoidal voltage in combination with the resonant voltage. The differential-mode sinusoidal voltage is the first output voltage. Both the resonant voltage and the differential-mode reference voltage are less than the preset isolation voltage.

[0033] In this configuration, the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 are all MOS transistors. Specifically, the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 can all be NMOS transistors. The first conducting terminal of the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 corresponds to the drain of the NMOS transistor, the second conducting terminal of the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 corresponds to the source of the NMOS transistor, and the controlled terminal of the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 corresponds to the gate of the NMOS transistor.

[0034] It should be noted that the differential-mode reference voltage is generated by the reference voltage module 220, and this differential-mode reference voltage can be combined with the resonant voltage to generate a differential-mode sinusoidal voltage with both positive and negative phases. Specifically, when the first switch Q1 and the fourth switch Q4 are turned on, and the second switch Q2 and the third switch Q3 are turned off, under the control of the control circuit 500, the low-voltage circuit 200 outputs a positive-phase differential-mode sinusoidal voltage; when the first switch Q1 is turned on and the fourth switch Q4 is turned off, and the second switch Q2 and the third switch Q3 are turned on, a negative-phase differential-mode sinusoidal voltage is output.

[0035] like Figure 3 As shown, in this embodiment, the high-voltage circuit 300 includes a first switch module 310, a second switch module 320, a third switch module 330, and a fourth switch module 340. The first terminal of the first switch module 310 is connected to the input circuit 100 to receive the second operating voltage. The second terminal of the first switch module 310 is connected to the first terminal of the second switch module 320 and to the first output terminal OUT1 of the isolation circuit 400. The second terminal of the second switch module 320 is connected to ground. The first terminal of the third switch module 330 is connected to the input circuit 100 to receive the second operating voltage. The second terminal of the third switch module 330 is connected to the first terminal of the fourth switch module 340 and to the second output terminal OUT2 of the isolation circuit 400. The second terminal of the fourth switch module 340 is connected to ground. The high-voltage circuit 300 is used to output a differential-mode square wave voltage.

[0036] When the first switch module 310 and the fourth switch module 340 are turned on and the second switch module 320 and the third switch module 330 are turned off under the control of the control circuit 500, the high-voltage circuit 300 outputs a high-level differential-mode square wave voltage; when the first switch module 310 and the fourth switch module 340 are turned off and the second switch module 320 and the third switch 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.

[0037] In this configuration, the first switch module 310, the second switch module 320, the third switch module 330, and the fourth switch module 340 are all MOSFETs. Specifically, the first switch module 310, the second switch module 320, the third switch module 330, and the fourth switch module 340 can all be NMOS transistors. The first conducting terminal of the first switch module 310, the second switch module 320, the third switch module 330, and the fourth switch module 340 corresponds to the drain of the NMOS transistor, the second conducting terminal of the first switch module 310, the second switch module 320, the third switch module 330, and the fourth switch module 340 corresponds to the source of the NMOS transistor, and the controlled terminal of the first switch module 310, the second switch module 320, the third switch module 330, and the fourth switch module 340 corresponds to the gate of the NMOS transistor.

[0038] like Figure 4 As shown, the first switch module 310, the second switch module 320, the third switch module 330 and the fourth switch module 340 may each include multiple MOSFETs connected in sequence to distribute the voltage.

[0039] like Figure 5 As shown, in this embodiment, the isolation circuit 400 includes a first isolation module 410 and a second isolation module 420. The voltage input terminals of the first isolation module 410 and the second isolation module 420 are both connected to the low-voltage circuit 200, and the voltage output terminals of the first isolation module 410 and the second isolation module 420 are both connected to the high-voltage circuit 300.

[0040] The first isolation module 410 includes a first voltage divider resistor R1, a second voltage divider resistor R2, a first unidirectional conductor 411, a second unidirectional conductor 412, a third unidirectional conductor 413, and a fourth unidirectional conductor 414. The first end of the first voltage divider resistor R1 is connected to the protection voltage terminal V1, which is used to output a protection voltage that corresponds to a preset isolation voltage. The second end of the first voltage divider resistor R1 is connected to the positive terminals of the first unidirectional conductor 411 and the third unidirectional conductor 413. The negative terminal of the first unidirectional conductor 411 is connected to the positive terminal of the second unidirectional conductor 412 and connected to the resonant module 210. The negative terminal of the second unidirectional conductor 412 is connected to the first end of the second voltage divider resistor R2. The negative terminal of the third unidirectional conductor 413 is connected to the positive terminal of the fourth unidirectional conductor 414 and connected to the high voltage circuit 300. The negative terminal of the fourth unidirectional conductor 414 is connected to the first end of the second voltage divider resistor R2. The second end of the second voltage divider resistor R2 is connected to ground. The negative terminal of the first unidirectional conductor 411 is the voltage input terminal of the first isolation module 410, and the negative terminal of the third unidirectional conductor 413 is the voltage output terminal of the first isolation module 410 (the first output terminal OUT1 of the isolation circuit 400).

[0041] like Figure 3-5 As shown, the second isolation module 420 has the same structure as the first isolation module 410 and is disposed between the reference voltage module 220 and the second terminal of the third switch 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 terminal of the third switch 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 and is used to isolate the resonant module 210 and the high voltage circuit 300. The voltage output terminal of the second isolation module 420 is used to output the differential mode reference voltage and is used to isolate the reference voltage module 220 and the high voltage circuit 300.

[0042] Specifically, the first unidirectional conductor 411, the second unidirectional conductor 412, the third unidirectional conductor 413, and the fourth unidirectional conductor 414 can each be a single diode or multiple diodes connected end-to-end. In this embodiment, each unidirectional conductor includes two diodes connected end-to-end. In this embodiment, the resistance values ​​of the first voltage divider resistor R1 and the second voltage divider resistor R2 are equal, making the preset isolation voltage half of the protection voltage. When the ratio of the resistance values ​​of the first voltage divider resistor R1 and the second voltage divider resistor R2 changes, the relationship between the preset isolation voltage and the protection voltage changes accordingly.

[0043] It should be noted that, taking the first isolation module 410 as an example, in this embodiment, if the protection voltage is 500V, the voltage division by the first voltage divider resistor R1 and the second voltage divider resistor R2 makes the preset isolation voltage of the voltage input terminal and the voltage output terminal of the first isolation module 410 both 250V. When the resonant voltage is transmitted to the first isolation module 410, it will pull the voltage input terminal of the first isolation module 410 down to the corresponding resonant voltage. At this time, the second unidirectional conductor 412 is turned on, pulling the voltage at the first end of the second voltage divider resistor R2 down to the resonant voltage. At the same time, the fourth unidirectional conductor 414 is also turned on, making the voltage at the voltage output terminal of the first isolation module 410 become the resonant voltage, thus achieving lossless output of the resonant voltage. If the high-amplitude voltage output from the second terminal of the first switching module 310 is transmitted to the first isolation module 410, the voltage at the first terminal of the first voltage divider resistor R1 is increased through the fourth unidirectional conductor 414. At this time, the voltage at the negative terminal of the second unidirectional conductor 412 is greater than the voltage at the positive terminal of the second unidirectional conductor 412, causing the second unidirectional conductor 412 to turn off, thus isolating the resonant module 210 and the second output voltage. Even if the resonant module 210 is not turned off, a seamless switching from the resonant voltage to the voltage output from the second terminal of the first switching module 310 is achieved. Similarly, the second isolation circuit 400 can also isolate the differential-mode reference module and the second output voltage, while also achieving a seamless switching from the differential-mode reference voltage to the voltage output from the second terminal of the first switching module 310. Ultimately, a seamless switching from the first output voltage to the second output voltage is achieved.

[0044] In this embodiment, the control circuit 500 includes a control unit and several optocouplers. The control unit is connected to the high-voltage circuit 300 and the low-voltage circuit 200 respectively through the optocouplers to control the generation of the second output voltage and the first output voltage. Specifically, the control unit is connected to the gates of the MOSFETs in the high-voltage circuit 300 and the low-voltage circuit 200 respectively through the optocouplers to control the on and off states of the MOSFETs in the high-voltage circuit 300 and the low-voltage circuit 200. The control unit can be a microcontroller or a microprocessor.

[0045] In another embodiment, unlike this embodiment, the isolation circuit 400 includes an isolating switch. The isolating switch can be a conventional high-voltage relay or a high-voltage switching switch. The controlled terminal of the isolating switch is connected to the control circuit 500. The first conducting terminal of the isolating switch is connected to the low-voltage circuit 200, and the second conducting terminal is connected to the high-voltage circuit 300. The isolating switch can connect and disconnect 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 simultaneously disconnect the isolating switch when the high-voltage circuit 300 outputs a second output voltage to protect the low-voltage circuit 200. This embodiment will not be described in detail.

[0046] like Figure 6 As shown, in this embodiment, the input circuit 100 includes a rectifier module 110 and a first voltage regulator module 120 and a second voltage regulator module 130 connected to the rectifier module 110. The rectifier module 110 rectifies the input voltage into an input DC voltage, the first voltage regulator module 120 converts the input DC voltage into a first operating voltage, and the second voltage regulator module 130 converts the input DC voltage into a second operating voltage. The rectifier module 110 can be a switching power supply topology module, the first voltage regulator module 120 can be a boost-dropout topology module, and the second voltage regulator module 130 can be a flyback boost module.

[0047] like Figure 6 As shown, in this embodiment, the control unit is also connected to the first voltage regulating module 120, the second voltage regulating module 130 and the isolation circuit 400 respectively. The control unit is used to configure the first working voltage, the second working voltage and the preset isolation voltage respectively.

[0048] The second embodiment of this application provides a power supply device, including the power supply circuit as described above. The power supply device can be an electrical energy driving device, specifically a medical device driving device. This embodiment does not limit the type of power supply device.

[0049] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0050] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0051] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A power supply circuit, characterized in that, include: An input circuit is configured to modulate an input voltage into a first operating voltage and a second operating voltage and output them. The input circuit includes a rectifier module and a first voltage regulator module and a second voltage regulator module connected to the rectifier module. The rectifier module rectifies the input voltage into an input DC voltage. The first voltage regulator module converts the input DC voltage into the first operating voltage, and the second voltage regulator module converts the input DC voltage into the second operating voltage. The first voltage regulator module is a boost-dropout topology module, and the second voltage regulator module is a flyback boost module. A low-voltage circuit, connected to the input circuit, is configured to generate and output a first output voltage based on the first operating voltage. A high-voltage circuit, connected to the input circuit, is 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, is used to output the first output voltage and is configured to isolate the low-voltage circuit from the second output voltage, which is higher than the preset isolation voltage, when the high-voltage circuit outputs the second output voltage; wherein the preset isolation voltage is greater than the first output voltage and less than the second output voltage; A control circuit, connected to the high-voltage circuit and the low-voltage circuit, is configured to control the high-voltage circuit and the low-voltage circuit to generate the first output voltage and the second output voltage, respectively.

2. The power supply circuit as described in claim 1, characterized in that, The low-voltage circuit includes a resonant module, which includes a first switch, a second switch, and a resonant unit. The first conducting terminal of the first switch is connected to the input circuit to receive the first operating voltage. The controlled terminal of the first switch is connected to the control circuit. The second conducting terminal of the first switch is connected to the first conducting terminal of the second switch and to the resonant unit. The controlled terminal of the second switch is connected to the control circuit. The second conducting terminal of the second switch is connected to ground. The output terminal of the resonant unit is connected to the isolation circuit for outputting a resonant voltage.

3. The power supply circuit as described in claim 2, characterized in that, The low-voltage circuit further includes a reference voltage module, which includes a third switch and a fourth switch. The first conducting terminal of the third switch is connected to the input circuit to receive the first operating voltage. The controlled terminal of the third switch is connected to the control circuit. The second conducting terminal of the third switch is connected to the first conducting terminal of the fourth switch and connected to the isolation circuit. The controlled terminal of the fourth switch is connected to the control circuit. The second conducting terminal of the fourth switch is connected to the ground terminal. The reference voltage module is used to output a differential-mode reference voltage, which is used to generate a differential-mode sinusoidal voltage in combination with the resonant voltage. The differential-mode sinusoidal voltage is the first output voltage.

4. The power supply circuit as described in claim 1, characterized in that, The high-voltage circuit includes a first switch module, a second switch module, a third switch module, and a fourth switch module; The first terminal of the first switch module is connected to the input circuit to receive the second operating voltage. The second terminal of the first switch module is connected to the first terminal of the second switch module and connected to the isolation circuit. The second terminal of the second switch module is connected to ground. The first terminal of the third switch module is connected to the input circuit to receive the second operating voltage. The second terminal of the third switch module is connected to the first terminal of the fourth switch module and connected to the isolation circuit. The second terminal of the fourth switch module is connected to ground. The high-voltage circuit is used to output a differential-mode square wave voltage, which is the second output voltage.

5. The power supply circuit as described in claim 3, characterized in that, 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 terminals of both the first and second isolation modules are connected to the high-voltage circuit.

6. The power supply circuit as described in claim 5, characterized in that, The first isolation module includes a first voltage divider resistor, a second voltage divider resistor, a first unidirectional conductor, a second unidirectional conductor, a third unidirectional conductor, and a fourth unidirectional conductor; The first end of the first voltage divider resistor is connected to the protection voltage terminal, which is used to output a protection voltage corresponding to the preset isolation voltage. The second end of the first voltage divider resistor is connected to the positive terminals of the first unidirectional conductor and the third unidirectional conductor, respectively. The negative terminal of the first unidirectional conductor is connected to the positive terminal of the second unidirectional conductor and connected to the resonant module. The negative terminal of the second unidirectional conductor is connected to the first end of the second voltage divider resistor. The negative terminal of the third unidirectional conductor is connected to the positive terminal of the fourth unidirectional conductor and connected to the high-voltage circuit. The negative terminal of the fourth unidirectional conductor is connected to the first end of the second voltage divider resistor. The second end of the second voltage divider resistor is connected to the ground terminal. The second isolation module has the same structure as the first isolation module; the first isolation module is used to output the resonant voltage and isolate the resonant module and the high voltage circuit, and the second isolation module is used to output the differential mode reference voltage and isolate the reference voltage module and the high voltage circuit.

7. The power supply circuit as described in claim 1, characterized in that, The control circuit includes a control unit and several optocouplers. The control unit is connected to the high-voltage circuit and the low-voltage circuit respectively through the several optocouplers to control the generation of the second output voltage and the first output voltage.

8. The power supply circuit as described in claim 7, characterized in that, The control unit is connected to the first voltage regulating module, the second voltage regulating module and the isolation circuit respectively, and the control unit is used to configure the first operating voltage, the second operating voltage and the preset isolation voltage respectively.

9. A power supply device, characterized in that, Includes the power supply circuit as described in any one of claims 1-8.

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