SEMICONDUCTOR SWITCHING DEVICE DRIVE CIRCUIT

摘要

Four energization switching devices and positive/negative switching devices are controlled to form a path charging a positive capacitor; a path connecting a power supply with the positive capacitor in series and energizing an inductor to charge a control terminal of a target switching device; a path charging the control terminal using electromagnetism in the inductor; a path supplying circulating current to the power supply when potential of the control terminal becomes higher than voltage of the power supply; a path charging a negative capacitor; a path connecting the power supply with the negative capacitor in series and energizing the inductor to discharge the control terminal; a path discharging the control terminal using electromagnetism in the inductor; and a path supplying circulating current to the power supply when potential of the control terminal becomes lower than potential of a negative terminal of the power supply.