DRIVING CIRCUIT FOR SEMICONDUCTOR SWITCHING DEVICE

摘要

PURPOSE:To obtain a satisfactory switching characteristic with high efficiency and without being affected by the ON-state duty of a control signal by correcting the quantity of charge/discharge of a capacitor corresponding to the ON-state duty of the control signal. CONSTITUTION:When a switching means SW1 is closed at the time of turning on a transistor Q1, the capacitor C1 is charged by a constant voltage source E in case of obtaining insufficient ON-state duty and charge on the capacitor C1, thereby the insufficient charge can be compensated. In such a way, it is possible to prevent switching speed from being delayed due to the reduction of the drawing of the sate charge of a FETQ3.