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Input-parallel output-series wide-gain boost-type direct-current converter used for fuel cell

A technology of DC converter and output series connection, which is applied in the direction of battery/fuel cell control device, output power conversion device, converter type, etc., and can solve small input current ripple, increased switching loss, large input current ripple, etc. problem, to achieve the effect of wide voltage gain, prolong service life, and reduce input current ripple

Inactive Publication Date: 2017-07-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in order to prevent the service life of the fuel cell from being shortened due to excessive input current ripple, the converter used is required to have a small input current ripple
[0004] The traditional boost DC converter has a simple structure, but its voltage gain is low, the voltage stress of the power device is large, and the input current ripple is large, resulting in increased switching loss and reduced service life of the fuel cell.

Method used

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  • Input-parallel output-series wide-gain boost-type direct-current converter used for fuel cell
  • Input-parallel output-series wide-gain boost-type direct-current converter used for fuel cell
  • Input-parallel output-series wide-gain boost-type direct-current converter used for fuel cell

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Embodiment 1

[0028] (1) Topology

[0029] The embodiment of the present invention proposes as figure 1 The shown input parallel-output series wide-gain boost DC converter topology. Inductance L 1 , the power switch Q 1 , Diode D 1 and capacitance C 2 Constitute the traditional boost DC converter topology, the inductor L 2 , the power switch Q 2 , Diode D 2 and D 3 , capacitance C 1 and C 3 A boost DC converter topology in which the output voltage is reversed to the input voltage is formed. The two are connected in parallel with the input and connected in series to form a wide-gain input parallel and output series boost DC converter topology. The power input terminal of the DC converter is connected with the fuel cell (using U in Indicated) is connected; the output terminal is connected with the high-voltage DC bus (indicated by load R).

[0030] (2) Wide voltage gain

[0031] The topology proposed in the embodiment of the present invention adopts an interleaved parallel contro...

Embodiment 2

[0050] Below to figure 1 The novel input parallel-output series wide-gain boost DC converter topology shown, figure 2 , 3 , the topological energy flow path diagram shown in 4 and 5, and Figure 6 , 7 The important working waveforms of the new topology are shown, and the principle of the DC converter is further introduced. See the description below for details:

[0051] Switching state 10: Power switch Q 1 conduction, Q 2 off, the diode D 1 and D 3 off, D 2 conduction, at this time the inductor current i L1 increases linearly, i L2 linearly decreases, the inductor current i L2 For capacitance C 1 charge, capacitor C 2 and C 3 discharge, the load energy is supplied by the capacitor C 2 and C 3 supply.

[0052] Switch state 00: power switch Q 1 and Q 2 off, the diode D 1 and D 2 conduction, D 3 turn off, at this time the inductor current i L1 and i L2 linearly decreases, the inductor current i L2 For capacitance C 1 charge, capacitor C 3 discharge, the...

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Abstract

The invention discloses an input-parallel output-series wide-gain boost-type direct-current converter used for a fuel cell. The input-parallel output-series wide-gain boost-type direct-current converter is applied to the voltage conversion condition of a fuel cell electric vehicle. An inductor L1, a power switch Q1, a diode D1 and a capacitor C2 constitute a traditional boost-type direct-current converter; an inductor L2, a power switch Q2, a diode D2, a diode D3, a capacitor C1 and a capacitor C3 constitute an output voltage and input voltage reverse boost-type direct-current converter; the traditional boost-type direct-current converter and the output voltage and input voltage reverse boost-type direct-current converter are connected together in accordance with an input-parallel output-series mode so as to form the wide-gain input-parallel output-series boost-type direct-current converter; the power source input end of the direct-current converter is connected with the fuel cell; the output end of the direct-current converter is connected with a high-voltage direct-current bus-bar; the voltage stress of each power device is identical and is half of output voltage; and input current ripples are smaller than inductor current ripples, so that the converter has low input current ripples. With the converter of the invention adopted, wide voltage gain is realized, and the prolonging of the service life of the fuel cell can be facilitated.

Description

technical field [0001] The invention relates to the technical field of power electronic power conversion, in particular to a novel wide-range input input parallel output series step-up DC converter, which is applied to fuel cells. Background technique [0002] With the continuous development of society, the global energy crisis situation and environmental pollution problems are becoming increasingly serious. Due to its non-renewability and a series of environmental pollution problems, traditional fossil energy (petroleum) can no longer meet human needs for energy. It has become an urgent task to find new energy that can replace traditional fossil energy. [0003] In the field of new energy, photovoltaic power generation, wind power generation and fuel cell power generation have excellent application prospects. As an application of new energy in the field of transportation, new energy electric vehicles have attracted much attention. New energy electric vehicles include pure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07H02M1/14B60L11/18
CPCB60L2210/14B60L58/30H02M1/14H02M3/07H02M1/0054H02M1/0077H02M1/0083Y02T10/70Y02T10/72Y02T90/40
Inventor 王萍周雷张云
Owner TIANJIN UNIV
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