Patent ID: 6380720
Filing Date: 2002-04-30
Classification: G05F

Abstract:
An ac-dc dual output mode power supply for converting an unregulated ac voltage from a coaxial cable power source into a regulated dc voltage, wherein the output mode, being either a linear mode or a pulsating mode, is selected based on the magnitude of said unregulated ac voltage, said power supply comprising:an input terminal for receiving said unregulated ac voltage; a half-wave rectifier for converting said unregulated ac voltage into an equivalent dc voltage; a regulator for converting said equivalent dc voltage into a regulated dc voltage; a reference voltage; a comparator for comparing said regulated dc voltage with said reference voltage and for producing a control signal based on said comparison; and a switch device for switching said output mode of said regulated dc voltage between said linear mode and said pulsating mode based on said control signal.