Single-phase inverter

A single-phase inverter, switch tube technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., can solve the problem that transformerless inverters cannot achieve DC input source and AC power Electrical isolation of the load, inability to consider leakage current and high efficiency at the same time

Active Publication Date: 2012-07-04
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology

[0003] However, 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.
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Embodiment Construction

[0197] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0198] The technical problem to be solved by the present invention is to provide a single-phase inverter, improve the output power quality of the inverter, reduce the ripple of the inductor current, and solve the problem of leakage current; and further provide a single-phase inverter Modulation strategies for unity power factor and / or modulation strategies for reactive power applications.

[0199] refer to figure 1 , is a topology diagram of the single-phase inverter according to Embodiment 1 of the present invention.

[0200] The single-phase inverter according to Embodiment 1 of the present invention includes: a first switching tube T1, a second switching tube TA2, a third switching tube TB3, a fourth switching tube TB4, a fifth swi...

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Abstract

The invention discloses a single-phase inverter. The positive terminal of a direct current power supply is connected with the first end of a first switching tube; the second end of the first switching tube is connected with the negative terminal of the direct current power supply through a second switching tube, a third switching tube and a fourth switching tube which are sequentially connected in series; the second end of the first switching tube is connected with the negative terminal of the direct current power supply through a fifth switching tube, a sixth switching tube and a seventh switching tube which are sequentially connected in series; a first clamping diode is connected between the common terminal of the third switching tube and the fourth switching tube and the common terminal of the fifth switching tube and the sixth switching tube; a second clamping diode is connected between the common terminal of the sixth switching tube and the seventh switching tube and the common terminal of the second switching tube and the third switching tube; an alternating current load is connected between the common terminal of the second switching tube and the third switching tube and the common terminal of the fifth switching tube and the sixth switching tube; and the second switching tube is reversely connected in parallel with a second diode, and the fifth switching tube is reversely connected with a fifth diode. The single-phase inverter provided by the embodiment of the invention can be used for improving the quality of output electric energy of the inverter.

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] However, 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. In order to obtain higher efficiency, a unipolar modulation strategy is ...

Claims

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Application Information

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IPC IPC(8): H02M7/537
Inventor 汪洪亮赵为
Owner SUNGROW POWER SUPPLY CO LTD
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