HIGH-VOLTAGE POWER UNIT AND MASS SPECTROMETER USING THE POWER UNIT

摘要

An output terminal of a positive voltage generating circuit and an output terminal of a negative voltage generating circuit are connected in series, and an output terminal of the negative voltage generating circuit is connected to a ground via a resistor. A switching circuit and a series connection circuit of resistors are connected in parallel to each other between the output terminals of the positive voltage generating circuit and the negative voltage generating circuit. The switching circuit is on-off driven by a voltage signal taken from a junction point between the resistors, and the switching circuit is on-off driven by a voltage signal taken from a junction point between the resistors. Accordingly, when the polarity of an output voltage is switched, electric charges accumulated up to that point are discharged through the switching circuit of a voltage OFF-side polarity, so that the voltage quickly falls.

主权项

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.