Patent ID: 6335577
Filing Date: 2002-01-01
Classification: H02H,H02M,H03K

Abstract:
A power supply control unit comprising:a power transmission means for supplying a power from a power source to a first load; an auxiliary power means for generating at least a kind of voltage different from a voltage of said power source; a semiconductor switch for controlling a power supply to a second load from said auxiliary power means by switching control depending on a control signal supplied to a control signal input terminal thereof; a reference voltage generating means for generating a reference voltage having a voltage characteristic equivalent to the voltage characteristic of a voltage between terminals of the semiconductor switch when a predetermined load is connected thereto; a detecting means for detecting a difference between a voltage between the terminals of the semiconductor switch and said reference voltage; a control means for controlling ON/OFF Of said semiconductor switch depending on a difference between the detected voltage between the terminals and the reference voltage; and a control reference voltage supply means for supplying a voltage serving for a reference of control to said control means.