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Multi-input high-gain boost converter

A boost converter, high-gain technology, applied to conversion equipment without intermediate conversion to AC, photovoltaic power generation, etc., can solve the problems of complex structure, low work efficiency, and high cost of the rear-stage converter, and improve the overall work efficiency , Cost reduction, EMI small effect

Inactive Publication Date: 2013-09-04
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the complex structure and large number of post-stage converters of photovoltaic cell modules in current photovoltaic power generation grid-connected systems (one converter is required after each cell module) , leading to problems such as high cost and low work efficiency; and to provide a DC-DC converter that not only has high gain boost capability, low voltage stress of switching devices, but also has multi-channel input capability

Method used

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Embodiment 1

[0020] The input terminal of the second inductor L2 is connected to the positive pole of the second photovoltaic cell module, the output terminal is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is connected to the anode of the second diode D2; between the first capacitor C1 and The node of the first diode D1 is connected to the cathode of the second diode D2; the second power switch S2 is connected between the node of the second inductor L2 and the second capacitor C2 and the negative pole of the converter, and the second power switch S2 The source is connected to the negative pole of the converter, and the drain of the second power switch S2 is connected to the node;

[0021] The input terminal of the third inductor L3 is connected to the anode of the third photovoltaic cell module, and the output terminal is connected to the anode of the third diode D3; the junction of the second capacitor C2 and the second diode D2 is connecte...

Embodiment 2

[0031] According to the different states of the power switch, the circuit can be divided into 4 working states (taking the duty cycle of the first phase greater than the duty cycle of the second phase greater than the duty cycle of the third phase as an example):

[0032] (1) The controller controls the second power switch S2 to be turned off, and the first power switch S1 and the third power switch S3 to be turned on. At this time, the photovoltaic cell module 2 passes through the filter circuit, passes through the second inductor L2, the second capacitor C2 and the second The second diode D2 charges the first capacitor C1; at this time, both the first power switch S1 and the third power switch S3 are turned on, and the photovoltaic cell module 1 and the photovoltaic cell module 3 pass through their respective filter circuits and pass through the first power switch S1 and the third power switch S3 charge the first inductor L1 and the third inductor L3 respectively; the first d...

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Abstract

The invention relates to a multi-input high-gain boost converter which is provided with a plurality of input ends. The multi-input high-gain boost converter can be connected with a plurality of photovoltaic cell modules and an input current of each path of photovoltaic cell module is controllable, so that not only can the requirement that different modules respectively work under the condition of the maximum power output be met, but also a great amount of devices are saved and the cost is reduced. A plurality of photovoltaic cell modules are allowed to supply power to the converter and each path of photovoltaic cell can independently work in the respective optimal working state by control. Each converter can be designed to be provided with different numbers of input ports according to different application places. The input current and an output voltage of each path of input port are controllable. Compared with the existing high-gain boost converter, the multi-input high-gain boost converter has the advantages that the circuit topology is simple, a coupling inductance does not exist [i.e. the EMI (electro magnetic interference) is low], and the voltage stress of a switching device is reduced, so that the integrated working efficiency of the converter is improved.

Description

technical field [0001] The invention relates to a DC-DC converter, and specifically designs a converter with multiple inputs and high boosting capacity used in a grid-connected photovoltaic power generation system. Background technique [0002] A photovoltaic power generation system is usually composed of multiple photovoltaic cell modules. In order to improve the working efficiency of solar power generation cells, it is generally required that these photovoltaic cell modules should work at the maximum power output state as much as possible. Typically this requires multiple DC-DC converters; each converter operates between the photovoltaic cell modules and the DC bus required for the grid-connected inverter. At the same time, the photovoltaic cell module is composed of several small photovoltaic cells connected in series and parallel, and limited by the mutual influence between the cells, the photovoltaic cells cannot be connected in series and parallel too much, which indir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/10
CPCY02E10/56
Inventor 罗全明邾玢鑫卢伟国周雒维
Owner CHONGQING UNIV
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