High voltage DC power supply power switch.
Power switch is widely used in high voltage DC power supply electrostatic dust, water quality improvement, medical X-ray machines and CT machines and other large equipment. Voltage up to 50 ~ l59kV, current to 0.5A above, the power up to 100kW.
Since the 70's, some Japanese companies began to use inverter technology, the rectified mains inverter frequency is about 3kHz, and then boost. Into the 80's, high-frequency switching power supply technology is developing rapidly.
Siemens shots using power transistor switching elements, the power of the switching frequency up to 20kHz or more. And the success of dry-type transformer for high frequency high voltage power supply, eliminating high-voltage transformer tank, so that further reduce the size of the transformer system.
Domestic high voltage DC power supply for electrostatic precipitator was developed, rectified into DC electricity, the use of zero-current switching full bridge series resonant inverter circuit for the high voltage DC voltage inverter, and then by the high-frequency step-up transformer, the last rectifier for the DC high voltage.
In the resistive load conditions, the output DC voltage to 55kV, current of 15mA, operating frequency is 25.6kHz.
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