Patent ID: 6316844
Filing Date: 2001-11-13
Classification: H02M,Y02B

Abstract:
A standby power supply circuit having a low power consumption, comprising:a voltage converter for rectifying a commercially used AC power source to convert the AC power source to a DC voltage;a standby power supplier for receiving the DC voltage from said voltage converter;a voltage comparator for comparing the DC voltage output from said voltage converter with pre-set reference voltages and to output a predetermined pulse signal, said voltage comparator comprising:a first reference voltage setter for receiving the DC voltage from said voltage converter and for setting a first reference voltage;a second reference voltage setter for receiving the DC voltage from said voltage converter and for setting a second reference voltage;a first voltage comparator for comparing the DC voltage output from said voltage converter with the first reference voltage, and for outputting a first pulse signal; anda second voltage comparator for comparing the DC voltage output from said voltage converter with the second reference voltage, and for outputting a second pulse signal; anda switch unit for controlling an ON/OFF operation of said voltage converter according to a pulse signal output from said voltage comparator.