Single-phase inverter

Abstract

Embodiments of the invention provide a single-phase inverter. The single-phase inverter is characterized in that: a positive terminal of a direct current power supply is connected with a negative terminal of the direct current power supply through a first, a second, a seventh and an eighth switch tubes, wherein the first, the second, the seventh and the eighth switch tubes are connected in series successively; the positive terminal of the direct current power supply is connected with the negative terminal of the direct current power supply through a fifth, a sixth, a third and a fourth switch tubes, wherein the fifth, the sixth, the third and the fourth switch tubes are connected in series successively; a second terminal of the first switch tube forms a short circuit with the second terminal of the fifth switch tube; the second terminal of the third switch tube forms the short circuit with the second terminal of the seventh switch tube; the second terminal of the second switch tube and the second terminal of the sixth switch tube are an alternating-current output terminal of the single-phase inverter; the second switch tube is parallelly connected with a second diode in a reverse direction; the third switch tube is parallelly connected with a third diode in the reverse direction; the sixth switch tube is parallelly connected with a sixth diode in the reverse direction; the seventh switch tube is parallelly connected with a seventh diode in the reverse direction. By using the single-phase inverter in the embodiments of the invention, an output power quality of the inverter can be increased.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a single-phase inverter. Background technique [0002] According to different application occasions and control methods of inverters, they can be divided into off-grid inverters and grid-connected inverters. In the grid-connected inverter, according to whether it has a transformer, it can be divided into a transformer-isolated inverter and a transformerless inverter. Due to its simple system structure, high efficiency, small size, low cost and many other advantages, the transformerless inverter has been developed rapidly and has become the mainstream of photovoltaic medium and small power. [0003] Since the transformerless inverter cannot achieve electrical isolation between the DC input source and the AC load, the leakage current problem is one of the key indicators of its reliability. However, the traditional H4 topology can no longer take into account both leakage...

AI Technical Summary

Problems solved by technology

[0003] Since the transformerless inverter cannot achieve electrical isolation between the DC input source and the AC load, the leakage current problem is one of the key indicators of its reliability

However, the traditional H4 topology can no longer take into account both leakage current and high efficiency.

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