Patent ID: 8648644
Filing Date: 2014-02-11
Classification: H03K

Abstract:
1. A switch control device that controls a switching operation of a power switch, comprising: an auxiliary power device including a parasitic capacitor, and charging the parasitic capacitor by receiving a power voltage to generate an auxiliary power voltage; a logic unit receiving an input signal that is input for controlling the switching operation of the power switch, the logic unit being driven by the power voltage but not by the auxiliary voltage during a normal operation; a control pulse generator driven by the auxiliary power voltage during the normal operation, and generating a set pulse to be higher than a predetermined transmission voltage and a reset pulse according to the input signal, wherein the control pulse generator generates the set pulse and the reset pulse as two separate signals; and an output unit generating a gate signal that turns on the power switch by being synchronized with the set pulse, and generating a gate signal that turns off the power switch by being synchronized with the reset pulse.