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High gain dual-input direct-current converter based on switched capacitor network and modulation method

A technology of switched capacitor network and DC converter, which is applied in the direction of converting DC power input into DC power output, adjusting electrical variables, and output power conversion devices, etc., which can solve the problems of low output voltage and inapplicability of Boost converters, etc., and achieve The effect of simple structure, flexible distribution and cost reduction

Inactive Publication Date: 2018-01-09
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the output voltage of photovoltaic cells and storage batteries is low, generally 25V ~ 45V, which is far lower than the DC voltage required by grid-connected inverters, and traditional Boost converters will not be applicable

Method used

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  • High gain dual-input direct-current converter based on switched capacitor network and modulation method
  • High gain dual-input direct-current converter based on switched capacitor network and modulation method
  • High gain dual-input direct-current converter based on switched capacitor network and modulation method

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with accompanying drawing:

[0022] Such as figure 1 As shown, the DC converter of the present invention includes a first input power supply U 1 , the second input power U 2 , the first inductance L 1 , the second inductance L 2 , the first power switch tube S 1 , the second power switch tube S 2 , Four switched capacitor network unit, output diode VD o , output filter capacitor C o and load resistance R; the four switched capacitor network unit consists of the first switched capacitor C 1 , the second switched capacitor C 2 , the third switched capacitor C 3 , the fourth switched capacitor C 4 and the first diode VD 1 , the second diode VD 2 , the third diode VD 3 , the fourth diode VD 4 composition;

[0023] The first input power U 1 The positive pole of the first inductor L 1 The input terminal connection; the first inductance L 1 The output terminals of the first power switch tube...

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PUM

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Abstract

The invention discloses a high gain dual-input direct-current converter based on a switched capacitor network and a modulation method; the high gain dual-input direct-current converter comprises two input sources, two inductors, two power switch tubes, one four-switch capacitor network unit, an output diode, an output filter capacitor and a load resistor; the four-switch capacitor network unit comprises four switch capacitors and four diodes, and the switch tubes can be connected / disconnected so as to effectively charge / discharge the capacitors. The dc converter is simple in a topology structure, small in switch device voltage stress, and two input sources can respectively provide the voltage gains 3 times and 2 times bigger than a conventional Boost converter, thus realizing two-input source high boost transformations; the dc converter is simple and flexible in control, and two path duty ratios can be controlled so as to control the two path input currents and output voltages, thus flexibly distributing each input source powers and maximum power tracing of the new energy.

Description

technical field [0001] The invention relates to the field of DC-DC converters, in particular to a high-gain dual-input DC converter based on switched capacitor networks. Background technique [0002] With the increasingly serious problems of energy crisis and environmental pollution, renewable and clean new energy sources have attracted much attention, among which photovoltaic cells are the most widely used for power generation. However, photovoltaic units are greatly affected by the environment, weather and region, and the power they generate is unstable and discontinuous. It is necessary to combine energy storage units such as batteries to form a joint power supply system to ensure power supply reliability. [0003] In the traditional new energy combined power supply system, each energy form is converted into a DC output through its own boost converter, connected in parallel to the common high-voltage DC bus, and then supplied to the grid or load through a grid-connected i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/06H02M3/155
Inventor 周悦耿晓珑孙孝峰
Owner YANSHAN UNIV
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