Patent ID: 9431226
Filing Date: 2016-08-30
CPC Classification: H01J,H02M

Claim Text:
1. A high-voltage power unit, comprising, for selectively outputting a high voltage of positive or negative polarity: a positive voltage generating circuit for generating a positive high voltage; a negative voltage generating circuit for generating a negative high voltage; and a control circuit for controlling each of the positive high voltage generated by the positive voltage generating circuit and the negative high voltage generated by the negative voltage generating circuit, wherein one of a pair of output terminals of the positive voltage generating circuit is connected to one of a pair of output terminals of the negative voltage generating circuit to connect the two voltage generating circuits in a series connection, and one of two terminals of the series connection is used as a reference side, while the other terminal is used to take out a high-voltage output whose polarity is switched, the high-voltage power unit further comprising: a) a first impedance-variable circuit section connected between the pair of output terminals of the positive voltage generating circuit; b) a second impedance-variable circuit section connected between the pair of output terminals of the negative voltage generating circuit; c) a first output driver for driving the second impedance variable circuit section to change an impedance of the second impedance-variable circuit section based on a voltage or a current appearing at the pair of output terminals of the positive voltage generating circuit; and d) a second output driver for driving the first impedance-variable circuit section to change an impedance of the first impedance-variable circuit section based on a voltage or a current appearing at the pair of output terminals of the negative voltage generating circuit.