Patent ID: 6169391
Filing Date: 2001-01-02
Classification: G05F,H02M

Abstract:
A device for converting high voltage alternating current to low voltage direct current comprising: an alternating current (AC) input voltage; a rectifier coupled to the AC input voltage; a control circuit connected to an output of the rectifier, the control circuit comprising: a voltage sensing circuit, the voltage sensing circuit comprising: a zener diode connected to the output of the rectifier; a voltage divider comprising a first resistor and a second resistor, wherein the first resistor is connected to the zener diode and the second resistor is connected to ground potential; and a sensing transistor wherein a base of the sensing transistor is connected to the voltage divider; and a switch comprising a MOSFET transistor wherein a gate electrode of the MOSFET transistor is connected to a collector of the sensing transistor, a drain electrode is connected to the output of the rectifier and a source electrode is coupled to ground potential; a linear regulator coupled to the control circuit; and a storage capacitor coupled to the control circuit and further coupled to the linear regulator.