Design of A Novel High Precise Direct Current Negative High Voltage Power Supply

This paper introduces a high precise direct current (DC) negative high voltage power supply. The supply's output voltage is 25kV and its maximal output current is 100mA. The power supply uses BOOST converter for power factor correction and voltage regulation. It converts DC to high frequency (HF) alternating current (AC) square wave with phase-shifted full bridge. The voltage of the AC square wave is boosted by HF transformer, then the HF high voltage AC square wave is double rectified to DC high voltage output. The HF high voltage transformer, which is designed and manufactured with special material and technique, solves several technical difficulties including influence of distributing parameters and insulation, and meets demands of high frequency, high voltage and high power. The experimental result shows the power supply has high input power factor, stable output voltage and small ripple.

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