Pulse power converter powered by high-speed generator and conversion method of converter

Abstract

The invention provides a pulse power supply converter powered by a high-speed generator and a conversion method of the converter. The converter comprises a three-phase MOSFET rectifier. The three-phase alternating current end of the high-speed generator is connected with a voltage-stabilizing DC-DC converter and an auxiliary power supply through the three-phase MOSFET rectifier. The voltage-stabilizing DC-DC converter is connected with the pulse load through an output buffer capacitor Co, output of the auxiliary power supply is connected with a synchronous rectification control circuit and a current type control circuit, the synchronous rectification control circuit is connected with the three-phase MOSFET rectifier, and the current type control circuit is connected with the voltage-stabilizing DC-DC converter. Ripple voltage of a pulse load end is reduced by adding a large-capacity buffer capacitor Co to the output end of a voltage-stabilizing DC-DC converter, and current type controlis applied to the DC-DC converter to suppress pulsating power fed back to a generator end. A synchronous rectification control MOSFET is adopted to replace a diode, so that the efficiency of the three-phase rectifier is improved.

Description

technical field [0001] The invention relates to a pulse power converter for power supply by a high-speed generator and a conversion method thereof. Background technique [0002] A pulse load power converter is a power converter used to supply power to a pulse load, which refers to a special type of load whose peak power is much higher than the average power. For pulse load power converters powered by high-speed generators, they mainly include AC-DC converters and DC-DC converters. AC-DC converters are used to convert variable-voltage and variable-frequency alternating current generated by high-speed generators into variable-voltage direct current , the DC-DC converter is used to convert the transformed direct current output by the AC-DC converter into a regulated direct current. [0003] The aerospace field has relatively strict requirements on the volume and weight of the equipment on board. In order to meet the high power density, the generator usually operates at a high ...

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Problems solved by technology

[0010] The main disadvantage of scheme 1) and scheme 3) is that the conduction voltage drop of the diode and SCR is relatively large. When the output voltage of the generator is low, the efficiency loss caused by the voltage drop of the diode and SCR is more obvious; at the same time, the SCR phase-controlled rectification control The required accuracy of the generator position angle signal is high. When the output frequency of the generator is high, it is difficult to obtain the high-precision generator position angle signal.

[0016] The main disadvantage of scheme 1) is that there are mutual conversions between various energies and rotating bodies, and the input current ripple and output voltage ripple are not very good.

It has the disadvantages of large volume and high noise

Solution 2) Although the output voltage fluctuates less, the input current ripple is worse

The main disadvantage of solution 3) is that the excessive output capacitance will cause the power converter to have obvious overcurrent phenomenon during the power-on transient

The main disadvantage of scheme 4) is that the energy buffering device is too complicated and is a full power conversion, which is difficult to realize and has high loss, resulting in low reliability and low efficiency of the power converter; at the same time, the input of the method described in scheme 4) is direct current, which cannot be directly applied Pulse power converter for three-phase high-frequency AC power supply

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