DC/DC converter structure for high-gain fuel cell vehicle and control method

A fuel cell and converter technology, which is applied in the direction of regulating electrical variables, control/regulating systems, converting DC power input to DC power output, etc. Large and other problems, to achieve the effect of small current fluctuation, low boost ratio, and improved efficiency

Active Publication Date: 2018-10-26
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of the coupling transformer, the isolated topology is large in size, high in cost and relatively low in efficiency; the traditional non-isolated boost topology (such as boost, buck-boost, etc.) has good dynamic response and high efficiency, but due to the The low voltage ratio cannot meet the needs of the DC bus high-voltage platform

Method used

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  • DC/DC converter structure for high-gain fuel cell vehicle and control method
  • DC/DC converter structure for high-gain fuel cell vehicle and control method
  • DC/DC converter structure for high-gain fuel cell vehicle and control method

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Embodiment Construction

[0033] like figure 1 As shown, a DC / DC converter structure of a high-gain fuel cell vehicle in this embodiment includes a control unit B and a main circuit A composed of a fuel cell, a load R and a DC / DC converter circuit, and the fuel cell is connected in series The input end of the DC / DC converter circuit, the load R is connected across the output end of the DC / DC converter circuit, and the DC / DC converter includes a first inductance L1, a second inductance L2, a third inductance L3, and a fourth inductance L4 , the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the first capacitor C1, the second capacitor C2, the first conduction diode D1, the second conduction diode D2, the first An upper bridge circuit and a lower bridge circuit that are symmetrically arranged and connected in parallel in a structure composed of three conduction diodes D3 and a fourth conduction diode D4;

[0034] The first inductor L1, t...

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Abstract

The invention provides a DC/DC converter structure for a high-gain fuel cell vehicle and a control method and belongs to the field of power system design and application for new energy vehicles. The DC/DC converter structure comprises an upper bridge circuit and a lower bridge circuit which are symmetrically arranged in structure and are connected in parallel, wherein the upper bridge circuit comprises a first inductor, a second switch tube, a second inductor, a second conducting diode and a first capacitor connected in series; a positive electrode terminal of a fuel cell is connected with a first switch tube through the first inductor and then connected to a negative electrode terminal of the fuel cell; the positive electrode terminal of the fuel cell is connected to a midpoint of the second switch tube and the second inductor through a first conducting diode; and the midpoint of the second inductor and the second conducting diode is connected with the negative electrode terminal of the fuel cell through a third switch tube. According to the DC/DC converter structure, the disadvantage of a low boost ratio of a traditional boost topology is avoided, the disturbance of input voltageto output voltage during wide range variation is offset and the overhigh cost is avoided.

Description

technical field [0001] The embodiments described in this application generally relate to DC converters and their control methods, which belong to the field of new energy vehicle power system design and application, and in particular, relate to a high-gain fuel cell vehicle DC / DC converter structure and its control method. Background technique [0002] With the promotion of new energy vehicles, fuel cell vehicles have the incomparable advantages of internal combustion engine vehicles such as high energy conversion efficiency and environmental friendliness without going through the heat engine process and being not limited by the Carnot cycle. At the same time, they can still maintain the high speed of traditional internal combustion engine vehicles. , long-distance driving, safety, comfort and other performances, it is considered to be the first choice for clean and efficient transportation in the 21st century. However, a DC / DC (direct current / direct current) converter must b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
CPCH02M3/1584
Inventor 吴晓刚于渤洋石文文
Owner HARBIN UNIV OF SCI & TECH
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