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Fuel cell wide-range input type quasi-Z-source switch capacitor boost-type DC converter

A DC converter and fuel cell technology, which is applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and converting devices for output power, etc., can solve the problem of high voltage gain, large voltage stress, increased switching loss and electromagnetic interference and other problems, to achieve the effect of continuous input current

Inactive Publication Date: 2017-06-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional isolated step-up DC converters are easy to achieve high voltage gain, but due to the leakage inductance of the transformer, it will generate a large voltage stress, which increases switching loss and electromagnetic interference

Method used

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  • Fuel cell wide-range input type quasi-Z-source switch capacitor boost-type DC converter
  • Fuel cell wide-range input type quasi-Z-source switch capacitor boost-type DC converter
  • Fuel cell wide-range input type quasi-Z-source switch capacitor boost-type DC converter

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Embodiment 1

[0026] 1. Topology

[0027] The present invention is based on a quasi-Z source network and a switched capacitor network, and proposes as image 3 Shown is a quasi-Z source switched capacitor wide gain boost DC converter. The power input terminal of the DC converter is connected with the fuel cell (using U in with a diode D that prevents reverse current 1 Indicated in series) are connected; the previous stage is the quasi-Z source network such as figure 1 shown by L 1 -D 2 -L 2 -C 1 -C 2 Composition; the latter stage is composed of capacitor C 3 、C 4 、C 5 and diode D 3 、D 4 、D 5 form a switched capacitor network such as figure 2 Shown; the output terminal is connected to the high-voltage DC bus.

[0028] 2. Wide voltage gain

[0029] According to the switching state of the power switch Q, there are two operating states of the topology proposed by the present invention: S=1 and S=0 (assuming that the switching period of the power switch tube is T, and the turn-o...

Embodiment 2

[0052] Below to image 3 The novel wide-gain quasi-Z source switched capacitor boost DC converter topology shown, Figure 4 , 5 The topological equivalent circuit diagram of and Figure 6 The important working waveforms when the new topology is running stably, and the principle of the solution in the first embodiment will be described. In one carrier cycle, the converter experiences two switching states. The two switch states are described below respectively.

[0053] (1) When the switch is turned on (S=1), the equivalent circuit of this state is as follows Figure 4 shown. according to Figure 6 The topological working waveform, when the power switch is turned on, the diode D 2 、D 3 、D 5 off. Input supply voltage U in with capacitance C 2 in series, through the diode D 1 and power switch Q to the inductor L 1 Charging; Capacitor C 1 Through the power switch Q to the inductor L 2 Charging; Capacitor C 5 , through diode D 4 To the capacitor C 3 charging while...

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Abstract

The invention discloses a fuel cell wide-range input type quasi-Z-source switch capacitor boost-type DC converter. The DC converter is based on a quasi-Z-source network and a switch capacitor network. The power input end of the DC converter is connected with a fuel cell, which is embodied by connecting the power input end Uin with a diode D1 capable of preventing current reversal in series; the front stage is the quasi-Z-source network, which is formed by an inductor L1, a diode D2, an inductor L2, a capacitor C1 and a capacitor C2; the back stage is the switch capacitor network, which is formed by a capacitor C3, a capacitor C4, a capacitor C5, a diode D3, a diode D4 and a diode D5; and an output end is connected with a high-voltage DC bus. The DC converter improves topology boosting capability and reduces voltage stress born by a power device, and is more suitable for voltage conversion occasions of the fuel cell.

Description

technical field [0001] The invention relates to the technical field of power electronic power conversion, in particular to a wide-range input type quasi-Z source switched capacitor step-up DC converter for fuel cells, which belongs to the application occasion of fuel cell unidirectional step-up DC converters. Background technique [0002] With the massive exploitation and utilization of fossil fuels, a series of energy problems and environmental problems have been triggered. People are eager to develop renewable clean energy to improve environmental problems and alleviate the energy crisis. At the same time, with the rapid increase in the number of automobiles in the world, the demand for fossil fuels (petroleum) in the automobile industry cannot be ignored. Automobiles consume a large amount of gasoline and diesel, and the exhaust gas produced is discharged into the atmosphere, causing serious air pollution. [0003] In recent years, the world has vigorously supported the ...

Claims

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Application Information

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IPC IPC(8): H02M3/156
CPCH02M3/156
Inventor 王萍傅传智张云
Owner TIANJIN UNIV
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