| 摘要 |
PURPOSE:To improve the precision of an output waveform by attaining the rapid rise and fall of the output of waveform in a high voltage power source device supplying a high voltage having three kinds values of positive and negative high voltages and the intermediate voltage as a bias voltage for development for an electrophotographic copying machine and a printer, etc. CONSTITUTION:High withstand voltage transistors Q1, Q2 are connected in series to the positive and negative high voltage sources (+V1, -V2), and the high voltage is supplied to a development sleeve being a load from the connected point. At this time, the output voltage of the connected point is compared with a reference value by a comparator 6, and the voltage sampled by a sample-hold circuit 7 is compared with the reference value by an error amplifier 8, and the transistors Q1, Q2 are on/off-controlled by a timing signal from a timing controller 1 based on these comparison results. |
