Patent ID: 8699237
Filing Date: 2014-04-15
Classification: H02M,Y02B,Y02E

Abstract:
1. A soft-switching inverter including: an isolation voltage-quadrupling DC converter including an isolation transformer, wherein the isolation transformer includes a first inductor, a second inductor, a first main switch, a second main switch and an active clamping circuit on a low-voltage side, wherein the active clamping circuit includes a first clamping switch, a second clamping switch and a clamping capacitor, wherein the isolation transformer includes a first diode, a second diode, a third diode, a fourth diode and a booster on a high-voltage side, wherein the booster includes a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, wherein the isolation voltage-quadrupling DC converter receives a DC power supply, converts the voltage of the DC power supply, and executes half-sine modulation on the DC power supply for operation in a continuous conduction mode, thus a continuous half-sine current; and an AC selecting switch unit electrically connected to the isolation voltage-quadrupling DC converter and the grid, wherein the AC selecting switch unit includes a first power switch, a second power switch, a third power switch and a fourth power switch, wherein the switches are switched in synchronization with the grid to convert the half-sine current to a sine current, wherein a low-frequency portion is filtered from the sine current with a filtering inductor and a filtering capacitor to render the output current a sine current at the same voltage as the grid so that electricity can be fed to the load or a unit power factor can be fed to the grid.