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Photovoltaic inverter

A photovoltaic inverter and switching circuit technology, applied in the field of inverters, can solve problems such as bridge arm short circuit, increase device conduction loss, circuit damage, etc., to reduce switching loss, reduce conduction loss, and prevent loss Effect

Inactive Publication Date: 2013-06-26
ALPHA ESS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Disadvantages: When the energy is output, the positive and negative half cycles of the current output need to pass through three devices S5, S1, S4 or S5, S3, S2, which increases the conduction loss of the device
In addition, the short circuit of the bridge arm caused by the failure of the switching device may occur, and this short circuit path has no impedance, which will generate a very large short circuit current in a very short time, which may cause the risk of circuit damage

Method used

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Embodiment Construction

[0027] Below in conjunction with accompanying drawing, structure and working process of the present invention will be further described.

[0028] Such as figure 1 As shown, the bipolar full-bridge inverter circuit includes a full-bridge topology circuit, two filter inductors, energy storage capacitors, a DC power supply, and a load. The full-bridge topology circuit is composed of four switching circuits, of which the four switching circuits The switching device S1 is connected in parallel with the diode D1, the switching device S2 is connected in parallel with the diode D2, the switching device S3 is connected in parallel with the diode D3, and the switching device S4 is connected in parallel with the diode D4; the switching device S1 and the switching device S2 are connected to form node A , the switching device S3 is connected with the switching device S4 to form a node B, and the filter inductor L1, the AC side load Vac and the filter inductor L2 are connected in series bet...

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Abstract

The invention discloses a photovoltaic inverter which comprises four switch circuits, two follow current circuits, two filter inductors, and a storage capacitor. Each follow current circuit is composed of a follow current switch device and a follow current diode in serial connection, wherein the follow current diode is a backward diode. The switch circuits are controlled by high-frequency PWM (pulse width modulation) signals, the follow current circuits are controlled by low-frequency signals identical with output of the inverter in frequency, and the storage capacitor is bridged at an input port of a full-bridge topological circuit. The photovoltaic inverter has the advantages that low power consumption, lower ripper waves, low cost, high efficiency, high reliability and the like.

Description

technical field [0001] The invention relates to an inverter for converting DC power into AC power, in particular to an inverter for converting DC power of solar cells in a photovoltaic array into AC power connected to the mains grid, which belongs to DC / AC ( DC / AC) power conversion device. Background technique [0002] The existing photovoltaic grid-connected inverters mainly include: [0003] 1) The isolated grid-connected inverter is mainly to electrically insulate the DC side and the AC side by using an isolation transformer. Although this inverter does not have the safety and EMC brought by common mode current (leakage current), etc. problem, but the cost is high and the efficiency of power conversion is low. [0004] 2) Non-isolated grid-connected inverters improve power conversion efficiency by omitting isolation transformers. However, because there is no electrical insulation between the DC side and the AC side, and there is a parasitic capacitance between the phot...

Claims

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Application Information

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IPC IPC(8): H02M7/48
CPCY02E10/56
Inventor 袁宏亮
Owner ALPHA ESS CO LTD
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