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Single-phase soft-switching and high-gain boost converter for distributed photovoltaic power generation

A distributed photovoltaic and soft switching technology, which is applied in the direction of photovoltaic power generation, electric variable adjustment, output power conversion devices, etc., can solve the problems of high cost and complex structure of the converter, and achieve low cost, small input current ripple, Effect of reducing conduction loss

Active Publication Date: 2010-10-20
杭州利沃得电源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of high cost and complicated structure in existing converters working in the soft switching state, the present invention provides a distributed photovoltaic power converter with continuous input current, all power devices are soft switching actions, low cost and simple structure. Single-phase soft-switching high-gain boost converter for power generation

Method used

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  • Single-phase soft-switching and high-gain boost converter for distributed photovoltaic power generation
  • Single-phase soft-switching and high-gain boost converter for distributed photovoltaic power generation
  • Single-phase soft-switching and high-gain boost converter for distributed photovoltaic power generation

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Embodiment 1

[0026] see figure 1 , the single-phase soft-switching high-gain step-up converter for distributed photovoltaic power generation of the present invention includes a single-phase Boost step-up circuit unit 1, a transformer voltage doubler circuit unit 2 and output circuit unit 3,

[0027] In the single-phase Boost circuit unit 1 working in the input current continuous mode, the input filter inductance L f The first end is connected to the positive pole of the power supply Vin, and the input filter inductance L f The second end of the first power switch tube S 1 The drain of the second power switch tube S 2 The source is connected, the second power switch S 2 The drain is connected to the first end of the clamping capacitor Cc, and the parallel capacitor C s The first end and the first power switch S 1 The drain is connected in parallel with the capacitor C s The second end of the first power switch tube S 1 The source is connected to the negative pole of the power supply...

Embodiment 2

[0037] see figure 2 The difference between this embodiment and the first embodiment lies in that the second end of the clamping capacitor Cc is connected to the positive pole of the power supply Vin. The rest of the structures and functions are the same.

Embodiment 3

[0039] see image 3 The difference between this embodiment and Embodiments 1 and 2 is that the second end of the clamping capacitor Cc is connected to the first end of the output capacitor Co. The rest of the structures and functions are the same.

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Abstract

The invention discloses a single-phase soft-switching and high-gain boost converter for distributed photovoltaic power generation. The converter comprises a single-phase Booster circuit unit working in an input current continuous mode, a transformer voltage doubling circuit unit and an output circuit unit which are connected in turn, wherein the single-phase Booster circuit unit working in the input current continuous mode consists of an input filtering inductor, two power switching tubes, a parallel capacitor and a clamping capacitor; the transformer voltage doubling circuit unit consists of a transformer provided with two windings, a blocking capacitor, a voltage doubling capacitor and a freewheel diode; the output circuit unit consists of an output diode and an output capacitor; and an output circuit is connected with a load. The converter has the advantages of realizing zero voltage switch-on and switch-off of a first power switching tube and a second power switching tube, and reducing input current ripple along with simple circuit structure, convenient control and suitability for high efficiency conversion occasions of solar energy distributed power generation.

Description

technical field [0001] The invention relates to a DC-DC converter, in particular to a single-phase soft-switching high-gain boost converter for distributed photovoltaic power generation. Background technique [0002] In a distributed solar photovoltaic power generation system, in order to improve the power generation efficiency of the solar cells themselves, a parallel structure of solar cells is generally adopted. However, the output voltage of a single solar panel is low and has a wide range of variation, while the bus voltage required by the grid-connected inverter is relatively high, so a first-stage DC-DC converter is required to achieve voltage conversion. The input current of the DC-DC converter is a continuous current, which can improve the utilization rate of the photovoltaic battery panel. How to realize a high-gain and high-efficiency single-phase DC-DC converter with continuous input current is of great significance to promote the development of the photovoltaic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCY02E10/56
Inventor 李武华梅烨赵一李威辰
Owner 杭州利沃得电源有限公司
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