Patent ID: 8111528
Filing Date: 2012-02-07
Classification: H02M

Abstract:
1. A DC to AC inverter comprising: a DC power input port having a positive input terminal and a negative input terminal, both connected to a DC source; a buck converter comprising a buck converting circuit, an input terminal, a common terminal and an output terminal, with the input terminal and the common terminal connected to the positive input terminal and the negative input terminal of the DC power input port respectively; a buck/boost converter comprising a buck/boost converting circuit, an input terminal, a common terminal and an output terminal, wherein the input terminal, the common terminal and the output terminal of the buck/boost converter are connected to the input terminal, the common terminal and the output terminal of the buck converter respectively; an output filter comprising a filtering circuit, an input terminal, an output terminal and a common terminal, wherein the input terminal and the common terminal of the output filter are connected to the output terminal and the common terminal of the buck converter respectively; and an AC output port comprising an output terminal and a common terminal, wherein the output terminal and the common terminal of the AC output port are connected to the output terminal and the common terminal of the output filter respectively, the AC output port functions as an output of the DC to AC inverter and is connected to a single-phase utility system, and the common terminal of the AC output port is connected to a neutral line of the single-phase utility system; wherein the buck converter and the buck/boost converter operate alternately to generate an AC sinusoidal current transmitted to the single-phase utility system via the output filter and the AC output port, the buck converter produces a positive half cycle signal of the sinusoidal current when the single-phase utility system is in positive half cycle, and the buck/boost converter produces a negative half cycle signal of the sinusoidal current when the single-phase utility system is in negative half cycle.