Device for applying high voltage using pulse voltage, and method of applying high voltage

摘要

A device for applying a high voltage using a pulse voltage is provided which applies a high voltage having a pulse width τ0 to a capacitive load (1) through a pulse transformer (4), the high voltage having pulse-like peaks with a steep leading edge, wherein a capacitance C1 of the capacitive load (1) and a secondary side leakage inductance L1 of the pulse transformer (4) satisfy the equation: L1=(τ0/π)2×(1/C1). This enables enlargement of the pulse-like peaks and application of any pulse repetition frequency when the high voltage having the pulse-like peaks is applied to the capacitive load through the pulse transformer.

主权项

1. A device for applying a high voltage using a pulse voltage that applies a high voltage having a steep leading edge to a capacitive load, comprising:
a pulse transformer; a switching circuit that supplies a pulse wave having a steep leading edge to the capacitive load via the pulse transformer, the switching circuit having a plurality of switching elements that are turned ON/OFF by gate control; an oscillator circuit configured to generate a signal having a predetermined duty ratio of α%, a duty ratio of 0%, and at least an intermediate duty ratio of β(α>β>0) % that is between said duty ratio of α% and a duty ratio of 0%; and a short pulse generation circuit that generates a short pulse corresponding to an ON voltage only during a predetermined period corresponding to a leading edge of a rectangular pulse output from said oscillator circuit, wherein the switching elements are gate controlled based on said short pulse, an output from the switching circuit applies a voltage to the capacitive load via the pulse transformer, and a secondary side leakage inductance L1 of the pulse transformer has a value such that half a cycle of oscillating voltage generated by the secondary side leakage inductance of the pulse transformer and the capacitance of a capacitive corresponds to a pulse width τ0 of an ON period when at least one of the switching elements is turned ON/OFF; wherein the value of the secondary side leakage inductance L1 of the pulse transformer and a value of the pulse width τ0 of the pulse wave are given so as to satisfy the following equation
L1=(τ0/π)2×(1/C1)wherein C1: capacitance of the capacitive load.