Power circuit of an AC power supply with an adjustable DC voltage regulation circuit

摘要

A power circuit of an AC power supply includes a power input unit connected to a AC/DC converter. The AC/DC converter is connected to a DC/DC circuit, and the DC/DC circuit is further connected to an adjustable DC voltage regulation circuit. The adjustable DC voltage regulation circuit is connected to an amplifier to amplify and convert the DC voltages into the AC voltages, thereby outputting different AC voltages and electric currents under the condition of not switching off the output when adjusting the voltage via cross position, so that a power level is switched promptly and a very low power distortion.

主权项

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.