Medium-frequency power supply with multiple power supplies

Abstract

The invention discloses an intermediate-frequency power supply with multiple power supplies. The intermediate-frequency power supply comprises first to sixth power supply modules and a main control board module, the input of the first power supply module is three-phase or single-phase commercial power, and the output of the first power supply module is first DC high voltage. The input of the second power supply module is three-phase intermediate-frequency alternating current, and the output is second direct-current high voltage; the inputs of the third power supply module and the fourth power supply module are second direct-current high-voltage voltages, and respectively output a group of third direct-current voltages and a group of fourth direct-current voltages; the input of the fifth power supply module is the second direct-current high-voltage voltage, and the output is the three-phase intermediate-frequency alternating-current voltage output; the sixth power supply module converts the first direct-current high-voltage power supply into a second direct-current high-voltage voltage to be supplied to the third power supply module, the fourth power supply module and the fifth power supply module; the main control board module controls the first power module to the sixth power module to be turned on and turned off, the main control board further comprises a general input / output interface, and the general input / output interface of the main control board is connected with input equipment and an indicator light display system.

Description

Technical Field

[0001] The invention relates to the technical field of single-person portable power supply equipment, and in particular to a medium-frequency power supply with multiple power sources. Background Art

[0002] The generator on the traditional aircraft engine realizes power supply by extracting shaft power, and the power generation capacity is relatively small. Due to the small capacity of the traditional aircraft generator, its power supply system has experienced 28V DC, 115V 400Hz AC or a hybrid power system combining the two. However, as the size of the aircraft becomes larger and larger, the traditional power supply system can no longer meet the power demand of the aircraft.

[0003] Since the aviation power supply system is required to work normally under both the unit power supply mode and the grid power supply mode, a multifunctional power electronic converter system that can work in different occasions is urgently needed. Summary of the invention

[0004] The object of the present invention is to provide a medium frequency power supply with multiple power supplies, the medium frequency power supply comprising: a first power module, a second power module, a third power module, a fourth power module, a fifth power module, a sixth power module and a main control board module;

[0005] The input of the first power module is a three-phase or single-phase AC power supply, and the output of the first power module is a first DC high voltage voltage; and the first DC high voltage voltage is supplied to the sixth power module;

[0006] The input of the second power supply module is a three-phase medium frequency AC power supply, and the output of the second power supply module is a second DC high voltage voltage;

[0007] The input of the third power supply module and the fourth power supply module is a second DC high voltage, the third power supply module independently outputs a set of third DC voltages, and the fourth power supply module independently outputs a set of fourth DC voltages; the third DC voltage and the fourth DC voltage have the same DC voltage and the same maximum current amplitude;

[0008] The input of the fifth power module is a second DC high voltage voltage, and the output of the fifth power module is a three-phase medium frequency AC voltage output;

[0009] The input of the sixth power supply module is a first DC high voltage power supply; and the first DC high voltage voltage is converted into a second DC high voltage voltage to supply the third power supply module, the fourth power supply module and the fifth power supply module;

[0010] The main control board module controls the startup and shutdown of the first power module, the second power module, the third power module, the fourth power module, the fifth power module and the sixth power module, and monitors the working status of the first power module to the sixth power module; the main control board also includes a universal input / output interface, and the universal input / output interface of the main control board is connected to the input device and the indicator light display system.

[0011] As the intermediate frequency power supply of the present invention, the three-phase AC power input by the first power module is connected to the input end of the three-phase Vienna rectifier circuit through the three-phase air switch and the first overvoltage protection circuit;

[0012] The single-phase AC power input by the first power module is connected to the input end of the three-phase Vienna rectifier circuit through the single-phase air switch and the first overvoltage protection circuit; the output of the three-phase Vienna rectifier circuit is the first DC high voltage voltage.

[0013] As described in the intermediate frequency power supply of the present invention, the three-phase intermediate frequency AC power supply input by the second power supply module is connected to the input end of the three-phase PWM rectifier circuit through the three-phase air switch and the second overvoltage protection circuit; the output of the three-phase PWM rectifier circuit is the second DC high voltage voltage.

[0014] As described in the intermediate frequency power supply of the present invention, the first power supply module, the second power supply module and the main control board module are interconnected through an internal RS485 bus, and the main control board module controls the first power supply module and the second power supply module through the internal RS485 bus; the main control board module detects the input power supply, and controls the first power supply module and the second power supply module to use only one of the three-phase AC power supply, single-phase AC power supply or three-phase intermediate frequency AC power supply as the input power supply at any time, and cuts off the input of other AC power supplies.

[0015] As described in the intermediate frequency power supply of the present invention, the main control board module is also connected to an auxiliary DC power supply, and the auxiliary DC power supply is powered by a first flyback auxiliary power supply of the first power supply module and a second flyback auxiliary power supply of the second power supply module to the main control board module;

[0016] The auxiliary DC power supply is composed of the first flyback auxiliary power supply of the first power module and the second flyback auxiliary power supply of the second power module, and can also provide power for an external 1553B bus and a portable computer;

[0017] The input of the first flyback auxiliary power supply is a first DC high voltage voltage; the output is a first auxiliary voltage;

[0018] The input of the second flyback auxiliary power supply is a second DC high voltage voltage; the output is a first auxiliary voltage;

[0019] The main control board module is also connected to a remote control computer via an external RS485 bus. As in the intermediate frequency power supply of the present invention, the DC / DC conversion circuit of the third power supply module converts the input second DC high voltage voltage into a third DC voltage, and outputs the third DC voltage through the third electromagnetic compatibility circuit;

[0020] The DC / DC conversion circuit of the fourth power module converts the input second DC high voltage voltage into a fourth DC voltage, and outputs the fourth DC voltage through the fourth electromagnetic compatibility circuit;

[0021] The DC / DC conversion circuit includes a phase-shifted full-bridge conversion circuit or an LLC full-bridge resonant conversion circuit.

[0022] As described in the intermediate frequency power supply of the present invention, the main control board module detects the voltage and current output by the third power module and the fourth power module through the voltage and current detection terminals; the main control board can control the ON / OFF switch of the third power module or the fourth power module to turn on or off the voltage output of the third power module or the fourth power module;

[0023] The ON / OFF is arranged inside the DC / DC conversion circuit.

[0024] As for the intermediate frequency power supply described in the present invention, the three-phase inverter circuit module provided in the fifth power supply module converts the second DC high voltage voltage into a three-phase intermediate frequency AC voltage, and outputs the three-phase intermediate frequency AC voltage through the fifth electromagnetic compatibility circuit.

[0025] As for the intermediate frequency power supply described in the present invention, the main control board module is connected to the fifth power supply module through the internal RS485 bus, monitors the input and output voltages of the fifth power supply module, and controls the on or off of the output voltage of the fifth power supply module.

[0026] As described in the intermediate frequency power supply of the present invention, the DC / DC conversion circuit provided in the sixth power supply module converts the input first DC high voltage voltage into a second DC voltage; the DC / DC conversion circuit includes a phase-shifted full-bridge conversion circuit or an LLC full-bridge resonant conversion circuit.

[0027] The invention method has the following advantages: the medium frequency power supply of the present invention is compatible with three-way AC power input, including single-phase AC220V, three-phase AC220V and AC115V400Hz, and the medium frequency power supply can work after any one of the inputs is connected; it can automatically select and switch when three inputs are input at the same time, and ensure that the medium frequency power supply is not damaged. The system can set the priority of the three inputs to automatically select the input power supply. The various converters of the present invention use iron silicon aluminum cores to wind the filter inductor, and the hysteresis loop is narrow, which can increase the magnetization frequency, thereby reducing the volume and weight and improving the power density. The rectifier tube uses silicon carbide diodes, and the switching transistor uses silicon carbide MOSFET. Compared with silicon-based diodes and silicon-based MOSFETs, the switching frequency can be increased from 10kHz-20kHz to 50kHz-100kHz, which greatly reduces the volume and weight of the power supply system and improves the energy density.

[0028] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a block diagram of the intermediate frequency power supply system of the bidirectional power supply of the present invention;

[0030] Figure 2 is a block diagram of the internal components of the first power module of the present invention;

[0031] Figure 3 It is the principle diagram of the three-phase Vienna rectifier circuit of the present invention;

[0032] Figure 4 is a block diagram of the internal components of the second power supply module of the present invention;

[0033] Figure 5 is a block diagram of the internal components of the fifth power module of the present invention;

[0034] Figure 6 It is the principle diagram of the LLC full-bridge resonant circuit used in the present invention;

[0035] Figure 7 It is the principle diagram of the three-phase inverter circuit used in the present invention;

[0036] Figure 8 It is a block diagram of the internal components of the main control board of the present invention. DETAILED DESCRIPTION

[0037] The medium frequency power supply of the present invention provides two DC28V10A direct currents, one AC115V10A400Hz three-phase alternating current, and one DC28V3A direct current to charge the 1553B motherboard and tablet computer to the aircraft hanging point. The power supply is required to be compatible with three power inputs of single-phase and three-phase AC220V50Hz and AC115V400Hz. When the three power inputs are connected at the same time, it is ensured that the medium frequency power supply is not damaged. The characteristics of the present invention are that the filter inductor is wound with iron silicon aluminum cores in many places in various converters, so that the hysteresis loop of the inductor and the transformer is narrow and the magnetization frequency is high, thereby greatly reducing the volume and weight of the converter and improving the power density of each converter. The electronic components of various converters are also carefully selected. Silicon carbide diodes are used for rectifier tubes at all levels, and silicon carbide MOSFETs are used as switching transistors as switching elements. Silicon carbide MOSFETs have greater advantages in switching frequency and conduction loss than the silicon-based diodes and silicon-based MOSFETs commonly used now, and can greatly increase the switching frequency, significantly reduce the volume and weight of the entire power supply system, and improve the energy density.

[0038] The technical scheme of the present invention will be clearly and completely described below in conjunction with specific embodiments, but those skilled in the art should understand that the embodiments described below are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The structural block diagram of the medium frequency power supply system of the present invention is shown in the attached figure. Figure 1 shown.

[0040] The present invention provides a medium frequency power supply with multiple power supplies, the medium frequency power supply comprising: a first power module, a second power module, a third power module, a fourth power module, a fifth power module, a sixth power module and a main control board module;

[0041] The input of the first power module is a three-phase or single-phase AC power supply, and the output of the first power module is a first DC high voltage voltage; and the first DC high voltage voltage is supplied to the sixth power module;

[0042] The input of the second power supply module is a three-phase medium frequency AC power supply, and the output of the second power supply module is a second DC high voltage voltage;

[0043] The input of the third power supply module and the fourth power supply module is a second DC high voltage, the third power supply module independently outputs a set of third DC voltages, and the fourth power supply module independently outputs a set of fourth DC voltages; the third DC voltage and the fourth DC voltage have the same DC voltage and the same maximum current amplitude;

[0044] The input of the fifth power module is a second DC high voltage voltage, and the output of the fifth power module is a three-phase medium frequency AC voltage output;

[0045] The input of the sixth power supply module is a first DC high voltage power supply; and the first DC high voltage voltage is converted into a second DC high voltage voltage to supply the third power supply module, the fourth power supply module and the fifth power supply module;

[0046] The main control board module controls the startup and shutdown of the first power module, the second power module, the third power module, the fourth power module, the fifth power module and the sixth power module, and monitors the working status of the first power module to the sixth power module; the main control board also includes a universal input / output interface, and the universal input / output interface of the main control board is connected to the input device and the indicator light display system.

[0047] Example 1

[0048] The intermediate frequency power supply of the present invention comprises power board 1, power board 2, power board 3, power board 4, power board 5, power board 6, main control board, buttons and display device, as well as output detection and control components of power board 3 and power board 4.

[0049] Attached Figure 2 This is a block diagram of the internal composition of the first power supply module of the present invention. Power board 1 receives single-phase AC power 220V and three-phase AC power 220V, which are mains power supplies with a power frequency of 50Hz or 60Hz. Power board 2 receives medium-frequency AC power 115V400Hz, and the medium-frequency power supply can work when any power supply is connected; when the main control board detects that two or more of the three input power supplies are input at the same time, it automatically selects one input power supply according to the set priority; in order to ensure that the medium-frequency power supply is not damaged, the priority order can be set as: three-phase AC power 220V, single-phase AC power 220V or medium-frequency AC power 115V400Hz.

[0050] Attached Figure 3 This is the schematic diagram of the three-phase Vienna rectifier circuit of the present invention. The three-phase or single-phase AC power supply 220V input by the power board 1 can be converted into AC / DC through the three-phase Vienna rectifier circuit of the power board 1, and the AC power is rectified into 800V DC power. When the single-phase AC power supply 220V is input, it is connected internally through a mechanical switch and processed by three single-phase Vienna rectification. The input N line is connected to the output capacitor midpoint circuit to be compatible with the single-phase input Vienna rectification. This does not increase the hardware capacity. This Vienna rectifier circuit can achieve the function of input power factor of 1 and low harmonic content of input current. At the same time, the drive power supply does not require high and low side isolation, but isolation is required between each phase drive.

[0051] Attached Figure 1Among them, MT1 and MT2 are voltage sensors, C3, C4 and C5 are high-voltage filter capacitors.

[0052] Attached Figure 3 Inductors L1, L2 and L3 are made of filter inductors wound with iron silicon aluminum cores, which have narrow hysteresis loops and can increase the magnetization frequency, thereby reducing volume and weight and increasing power density. D1-D6 use silicon carbide diodes, and Q1-Q6 use silicon carbide MOSFETs. Compared with silicon-based diodes and silicon-based MOSFETs, the switching frequency can be increased from 10kHz-20kHz to 50kHz-100kHz, greatly reducing the volume and weight of the power system and increasing energy density.

[0053] Attached Figure 6 It is the principle diagram of the LLC full-bridge resonant circuit used in the present invention.

[0054] The 800V DC power passes through the LLC (dual inductor single capacitor series resonance) full-bridge resonant circuit DC / DC converter on the power board 6 to achieve high-power, high-frequency soft-switching DC to DC conversion with isolation between input / output. The transformer has high utilization rate and is assisted by secondary-side synchronous rectification to achieve the highest efficiency conversion while reducing electromagnetic compatibility pressure.

[0055] In the LLC (dual inductor single capacitor series resonance) full-bridge resonant circuit, the switching transistors Q13-16 use silicon carbide MOSFETs, and Q17-Q20 use silicon carbide MOSFETs for synchronous rectification, which greatly reduces losses, increases frequency, and reduces the size and weight of the power supply system.

[0056] Figure 4 is a block diagram of the internal components of the second power supply module of the present invention;

[0057] When using a medium frequency AC power supply, 115V400Hz is rectified and boosted through the three-phase PWM rectifier circuit of the power board 2, and the three-phase AC of the AC power supply 115V400Hz is directly converted into 360V DC power for the subsequent converter. Note that the single-phase AC power supply, three-phase AC power supply or three-phase medium frequency AC power supply of the present invention is used in a selective manner. The power board 1 and the power board 2 are connected with an electromagnetic compatibility filter and an overvoltage and overcurrent soft-start protection circuit between the air switch and the rectifier circuit. The electromagnetic compatibility filter and the overvoltage and overcurrent soft-start protection circuit have multiple implementation methods in this field, which are not the key technologies required to be protected by the present invention and can be regarded as an overall overvoltage protection circuit.

[0058] As the intermediate frequency power supply of the present invention, the three-phase AC power input by the first power module is connected to the input end of the three-phase Vienna rectifier circuit through the three-phase air switch and the first overvoltage protection circuit;

[0059] The single-phase AC power input by the first power module is connected to the input end of the three-phase Vienna rectifier circuit through the single-phase air switch and the first overvoltage protection circuit; the output of the three-phase Vienna rectifier circuit is the first DC high voltage voltage.

[0060] As described in the intermediate frequency power supply of the present invention, the three-phase intermediate frequency AC power supply input by the second power supply module is connected to the input end of the three-phase pulse width modulation (PWM) rectifier circuit through the three-phase air switch and the second overvoltage protection circuit; the output of the three-phase pulse width modulation PWM rectifier circuit is the second DC high voltage voltage.

[0061] Attached Figure 4 It is a block diagram of the internal composition of the second power supply module of the present invention.

[0062] Example 2

[0063] As described in the intermediate frequency power supply of the present invention, the first power supply module, the second power supply module and the main control board module are interconnected through an internal RS485 bus, and the main control board module controls the first power supply module and the second power supply module through the internal RS485 bus; the main control board module detects the input power supply, and controls the first power supply module and the second power supply module to use only one of the three-phase AC power supply, single-phase AC power supply or three-phase intermediate frequency AC power supply as the input power supply at any time, and cuts off the input of other AC power supplies.

[0064] As described in the intermediate frequency power supply of the present invention, the main control board module is also connected to an auxiliary DC power supply, and the auxiliary DC power supply is powered by a first flyback auxiliary power supply of the first power supply module and a second flyback auxiliary power supply of the second power supply module to the main control board module;

[0065] The auxiliary DC power supply is composed of the first flyback auxiliary power supply of the first power module and the second flyback auxiliary power supply of the second power module, and can also provide power for an external 1553B bus and a portable computer;

[0066] The input of the first flyback auxiliary power supply is a first DC high voltage voltage; the output is a first auxiliary voltage;

[0067] The input of the second flyback auxiliary power supply is a second DC high voltage voltage; the output is a first auxiliary voltage;

[0068] The external auxiliary DC power supply is connected to the auxiliary power input terminal of the main control board module;

[0069] The main control board module is also connected to a remote control computer via an external RS485 bus. The main control board can be used as a slave to obtain working instructions from a host computer via an external RS485 bus and upload the internal working status of the intermediate frequency power supply.

[0070] Example 3

[0071] The power board 3 and the power board 4 have the same structure. The DC / DC conversion circuit on the board converts the input second DC high voltage voltage into the third DC voltage, and converts the 360V DC into two DC28V10A outputs. The power board 5 converts the 360V DC into a three-phase AC power supply 115V10A400Hz AC output; the auxiliary source of the main control board is the DC / DC 800 / 28 flyback auxiliary source inside the power board 1 or the DC360V DC bus after rectification of the AC power supply 115V400Hz, and the internal DC28V1 is generated through the DC / DC360 / 28 flyback power supply as an auxiliary power output to power the main control board and the tablet charger.

[0072] The main control board, as the host, controls the start and stop of power board 1, power board 2, power board 5 and power board 6 and obtains their working status through RS485 bus 1; the input power supply on power board 1 or power board 2 is selected, and three-phase AC power supply is preferred. Since the input power supply on power board 1 and power board 2 is selected, in fact, there is only one set of 360V DC voltage output by power board 2 and power board 6 at any time. In addition, the main control board controls whether power board 3 and power board 4 are working through the ON / OFF switch, and detects their output voltage and current; the main control board controls whether the auxiliary voltage VDC28V is connected to power board 2 through the ON / OFF switch; the main control board also obtains key commands through the general IO port and displays the system working status through the indicator light.

[0073] The main control board acts as a slave and obtains working instructions and uploads system working status from the host computer through RS485 bus 2.

[0074] Example 4

[0075] In the intermediate frequency power supply of the present invention, the DC / DC conversion circuit of the third power supply module converts the input second DC high voltage voltage into a third DC voltage, and outputs the third DC voltage through the third electromagnetic compatibility circuit;

[0076] The DC / DC conversion circuit of the fourth power module converts the input second DC high voltage voltage into a fourth DC voltage, and outputs the fourth DC voltage through the fourth electromagnetic compatibility circuit;

[0077] The DC / DC conversion circuit includes a phase-shifted full-bridge conversion circuit or an LLC full-bridge resonant conversion circuit.

[0078] As described in the intermediate frequency power supply of the present invention, the main control board module detects the voltage and current output by the third power module and the fourth power module through the voltage and current detection terminals; the main control board can control the ON / OFF switch of the third power module or the fourth power module to turn on or off the voltage output of the third power module or the fourth power module;

[0079] The ON / OFF is arranged inside the DC / DC conversion circuit.

[0080] As for the intermediate frequency power supply described in the present invention, the three-phase inverter circuit module provided in the fifth power supply module converts the second DC high voltage voltage into a three-phase intermediate frequency AC voltage, and outputs the three-phase intermediate frequency AC voltage through the fifth electromagnetic compatibility circuit.

[0081] As for the medium frequency power supply described in the present invention, the main control board module is connected to the fifth power supply module through the internal RS485 bus, monitors the input and output stages of the fifth power supply module, and controls the output voltage of the fifth power supply module to be turned on or off.

[0082] Attached Figure 7 It is a schematic diagram of a three-phase inverter circuit used in the present invention.

[0083] The power board 5 includes a three-phase inverter circuit, an electromagnetic compatibility filter, a switch circuit, and an internal RS485 bus. The internal RS485 bus is used to establish communication with the main control board, and exchange control and status information. The three-phase inverter circuit is the basic circuit of the power board 5.

[0084] Among them, L4-L6 uses sendust core to wind the filter inductor, which has a narrow hysteresis loop and can increase the magnetization frequency, thereby reducing the volume and weight and increasing the power density. Q7-Q12 uses 650V, 65A, and 50mΩ on-resistance Rdson of silicon carbide MOSFET. The use of silicon carbide MOSFET can increase the switching frequency from 10kHz-20kHz to 50kHz-100kHz, greatly reducing the volume and weight of the power system and increasing the energy density. L4-L6 uses sendust 26μ series magnetic core.

[0085] Figure 8 It is a block diagram of the internal components of the main control board of the present invention.

[0086] The on / off terminal is used to control the switches of the third and fourth power modules, and the Vcs1, Ics1, Vcs2, and Ics2 terminals are used to detect the output voltage and current of the third and fourth power modules.

[0087] The present invention has the following advantages: the medium frequency power supply of the present invention is compatible with three-way AC power input, including single-phase AC power supply 220V, three-phase AC power supply 220V and AC power supply 115V400Hz, and the medium frequency power supply can work after any one of the inputs is connected; it can automatically select and switch when three inputs are input at the same time, and ensure that the medium frequency power supply is not damaged. The system can set the priority of the three inputs to automatically select the input power supply. The various converters of the present invention use iron silicon aluminum core winding filter inductors, and the hysteresis loop is narrow, which can increase the magnetization frequency, thereby reducing the volume and weight and improving the power density. The rectifier tube uses silicon carbide diodes, and the switching transistor uses silicon carbide MOSFET. Compared with silicon-based diodes and silicon-based MOSFETs, the switching frequency can be increased from 10kHz-20kHz to 50kHz-100kHz, which greatly reduces the volume and weight of the power supply system and improves the energy density.

[0088] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A medium frequency power supply with multiple power supplies, characterized in that: The intermediate frequency power supply includes: a first power module, a second power module, a third power module, a fourth power module, a fifth power module, a sixth power module and a main control board module; The input of the first power module is a three-phase or single-phase AC power supply, and the output of the first power module is a first DC high voltage voltage; and the first DC high voltage voltage is supplied to the sixth power module; The input of the second power supply module is a three-phase medium frequency AC power supply, and the output of the second power supply module is a second DC high voltage voltage; The input of the third power supply module and the fourth power supply module is a second DC high voltage, the third power supply module independently outputs a set of third DC voltages, and the fourth power supply module independently outputs a set of fourth DC voltages; the third DC voltage and the fourth DC voltage have the same DC voltage and the same maximum current amplitude; The input of the fifth power module is a second DC high voltage voltage, and the output of the fifth power module is a three-phase medium frequency AC voltage output; The input of the sixth power supply module is a first DC high voltage power supply; and the first DC high voltage voltage is converted into a second DC high voltage voltage to supply the third power supply module, the fourth power supply module and the fifth power supply module; The main control board module controls the startup and shutdown of the first power module, the second power module, the third power module, the fourth power module, the fifth power module and the sixth power module, and monitors the working status of the first power module to the sixth power module; the main control board also includes a universal input / output interface, and the universal input / output interface of the main control board is connected to the input device and the indicator light display system.

2. The medium frequency power supply according to claim 1, characterized in that: The three-phase AC power input by the first power module is connected to the input end of the three-phase Vienna rectifier circuit through the three-phase air switch and the first overvoltage protection circuit; The single-phase AC power input by the first power module is connected to the input end of the three-phase Vienna rectifier circuit through the single-phase air switch and the first overvoltage protection circuit; the output of the three-phase Vienna rectifier circuit is the first DC high voltage voltage.

3. The medium frequency power supply according to claim 1, characterized in that: The three-phase medium-frequency AC power input by the second power module is connected to the input end of the three-phase PWM rectifier circuit through a three-phase air switch and a second overvoltage protection circuit; the output of the three-phase PWM rectifier circuit is a second DC high-voltage voltage.

4. The medium frequency power supply according to any one of claims 1 to 3, characterized in that: The first power module, the second power module and the main control board module are interconnected through an internal RS485 bus, and the main control board module controls the first power module and the second power module through the internal RS485 bus; the main control board module detects the input power supply, and controls the first power module and the second power module to use only one of the three-phase AC power supply, the single-phase AC power supply or the three-phase medium frequency AC power supply as the input power supply at any time, and cuts off the input of other AC power supplies.

5. The medium frequency power supply according to claim 4, characterized in that: The main control board module is also connected to an auxiliary DC power supply, and the auxiliary DC power supply is powered by a first flyback auxiliary power supply of the first power supply module and a second flyback auxiliary power supply of the second power supply module to supply power to the main control board module; The auxiliary DC power supply is composed of the first flyback auxiliary power supply of the first power module and the second flyback auxiliary power supply of the second power module, and can also provide power for an external 1553B bus and a portable computer; The input of the first flyback auxiliary power supply is a first DC high voltage voltage; The output is a first auxiliary voltage; The input of the second flyback auxiliary power supply is a second DC high voltage voltage; the output is a first auxiliary voltage; The main control board module is also connected to a remote control computer via an external RS485 bus.

6. The medium frequency power supply according to claim 1, characterized in that: The DC / DC conversion circuit of the third power supply module converts the input second DC high voltage voltage into a third DC voltage, and outputs the third DC voltage through the third electromagnetic compatibility circuit; The DC / DC conversion circuit of the fourth power module converts the input second DC high voltage voltage into a fourth DC voltage, and outputs the fourth DC voltage through the fourth electromagnetic compatibility circuit; The DC / DC conversion circuit includes a phase-shifted full-bridge conversion circuit or an LLC full-bridge resonant conversion circuit.

7. The medium frequency power supply according to claim 6, characterized in that: The main control board module detects the voltage and current output by the third power module and the fourth power module through the voltage and current detection terminals; the main control board can control the ON / OFF switch of the third power module or the fourth power module to turn on or off the voltage output of the third power module or the fourth power module; The ON / OFF is arranged inside the DC / DC conversion circuit.

8. The medium frequency power supply according to any one of claims 1, characterized in that: The three-phase inverter circuit module provided in the fifth power supply module converts the second DC high voltage voltage into a three-phase medium frequency AC voltage, and outputs the three-phase medium frequency AC voltage through the fifth electromagnetic compatibility circuit.

9. The medium frequency power supply according to claim 8, characterized in that: The main control board module is connected to the fifth power supply module via an internal RS485 bus, monitors the input and output voltages of the fifth power supply module, and controls the on or off of the output voltage of the fifth power supply module.

10. The medium frequency power supply according to claim 1, characterized in that: The DC / DC conversion circuit provided in the sixth power supply module converts the input first DC high voltage voltage into a second DC voltage; the DC / DC conversion circuit includes a phase-shifted full-bridge conversion circuit or an LLC full-bridge resonant conversion circuit.

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