Patent ID: 9240730
Filing Date: 2016-01-19
CPC Classification: H02M,H03F

Claim Text:
1. A power circuit of an AC power supply comprising: a power input unit externally connected to an AC power, thereby supplying an AC voltage from an outside; an AC/DC converter connected to said power input unit for converting said AC voltage input from said power input unit into a DC voltage output via a filter and rectification; an DC/DC circuit connected to said AC/DC converter for providing a full-wave rectified DC voltage which is formed by transforming a voltage level of said DC voltage output from said AC/DC converter; an adjustable DC voltage regulation circuit connected to said DC/DC circuit for regulating and stabilizing said voltage level of said DC voltage output from said DC/DC circuit; an amplifier connected to said adjustable DC voltage regulation circuit for amplifying and converting said DC voltage output from said adjustable DC voltage regulation circuit into an AC voltage; said adjustable DC voltage regulation circuit being a step-down converter; a primary side circuit connected to a transformer; said transformer is further connected to a secondary side circuit; said adjustable DC voltage regulation circuit adjusting different outputs of DC voltages under a condition of not switching off to allow DC voltages to be converted into different AC voltage; said AC power supply power circuit outputting different AC voltages; and said AC power supply power circuit adjusting voltages via cross position without interrupting output, switching a power level promptly, and reaching a very low distortion thereof; and said adjustable DC voltage regulation circuit is a constant voltage regulation; when said AC voltage output from said amplifier is a high-voltage over 150 volts, said adjustable DC voltage regulation circuit is in a position of high-voltage power supply; when said AC voltage output from said amplifier is a low-voltage less than 150 volts, said adjustable DC voltage regulation circuit is in a position of low-voltage power supply.