A DC high-voltage high-frequency switching power supply and its control method with variable leading edge of variable modulating waveform in a full range

Abstract

The invention discloses a full-range variable and modulatable, waveform front edge-variable, direct-current, high-voltage and high-frequency switching power source and a control method thereof. The direct-current, high-voltage and high-frequency switching power source comprises a three-phase alternating-current rectification and filtering circuit, a full-bridge inverter circuit, high-frequency isolation transformers, AC-DC modules, a first microprocessor, a driving circuit, a PSM power source control system and a signal isolation and sampling circuit; a three-phase alternating-current power source is connected with the full-bridge inverter circuit through the three-phase alternating-current rectification and filtering circuit; the full-bridge inverter circuit is connected with the primary sides of the 59 identical high-frequency isolation transformers; the output of the high-frequency isolation transformers is connected with the AC-DC modules; the AC-DC modules comprise field-effect transistors which control direct-current voltage so as to make the direct-current voltage outputted in a superposed and series manner or not outputted in a superposed and series manner; and the PSM power source control system is connected with the 59 AC-DC modules through 59 optical fibers. The full-range variable and modulatable, waveform front edge-variable, direct-current, high-voltage and high-frequency switching power source and the control method of the invention have the advantages of high voltage control precision, small size, high power density, convenient maintenance, multi-mode output, adjustability in waveform front-edge time, high controllability and the like.

Description

technical field [0001] The invention relates to the field of DC high-voltage and high-frequency switching power supplies, in particular to a DC high-voltage and high-frequency switching power supply and a control method thereof with variable leading edge of a full-range variable modulating waveform. Background technique [0002] In some occasions, such as microwave generation, insulation test, gas discharge application, etc., it is required that the output voltage of high voltage power supply can be adjusted, modulated and stable in a wide range. [0003] In order to meet these requirements, there are currently two methods for related devices at home and abroad. The first method designs the entire power supply into two parts: the front-stage high-voltage power supply platform and the modulator; the front-stage high-voltage power supply uses thyristor AC voltage regulation, transformer boosting and diode rectification schemes. The modulator uses a vacuum tetrode, works in an...

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Problems solved by technology

[0004] However, the equipment designed using the above method has the following disadvantages: the whole device is large in size, low in power density, or analog control cannot realize full digital control, and the modulation frequency is lower than 1kHz; multi-winding power frequency transformer, insulation process requirements high, high cost

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