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A DC/DC convertor for a high-gain fuel cell vehicle

A fuel cell and converter technology, applied in the direction of adjusting electrical variables, converting DC power input to DC power output, instruments, etc., can solve problems such as low boost ratio of boost topology, output voltage disturbance, etc., to improve the boost ratio , prolong the service life, the effect of small current fluctuation

Active Publication Date: 2019-01-22
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of the existing DC / DC converters for battery vehicles with low step-up topology boost ratio and the disturbance of the output voltage when the input voltage is wide range, and proposes a high-gain DC / DC converter for fuel cell vehicles

Method used

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  • A DC/DC convertor for a high-gain fuel cell vehicle
  • A DC/DC convertor for a high-gain fuel cell vehicle
  • A DC/DC convertor for a high-gain fuel cell vehicle

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specific Embodiment approach 1

[0045] Specific implementation mode one: the following combination figure 1 Describe this embodiment, a high-gain fuel cell vehicle DC / DC converter described in this embodiment, the converter includes a DC / DC converter main circuit 1 and a DC / DC converter control circuit 2;

[0046] The DC / DC converter main circuit 1 includes an upper bridge circuit, a lower bridge circuit and a fuel cell voltage source E; the upper bridge circuit includes: diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, inductor L1 , inductance L2, inductance L3, switching tube Q1, switching tube Q2, switching tube Q3 and capacitor C1;

[0047] The lower bridge circuit includes: diode D6, diode D7, diode D8, diode D9, diode D10, diode D11, inductor L4, inductor L5, inductor L6, switching tube Q4, switching tube Q5, switching tube Q6 and capacitor C2;

[0048] The anode of the diode D1 is simultaneously connected to the anode of the diode D4, the anode of the diode D6, one end of the capacitor C2,...

specific Embodiment approach 2

[0059] Specific implementation mode two: the following combination figure 1 Describe this embodiment. This embodiment will further describe the high-gain fuel cell vehicle DC / DC converter described in Embodiment 1. The DC / DC converter control circuit 2 includes a protection circuit 201, a DSP system 202, a voltage sensor 203 and current sensor 204;

[0060] The voltage sensor 203 collects the voltage signal of the capacitor C1 of the DC / DC converter main circuit 1, the voltage signal of the capacitor C2, the output voltage signal of the DC / DC converter main circuit 1 and the output voltage signal of the fuel cell voltage source E; and The collected voltage signal of the capacitor C1, the voltage signal of the capacitor C2, the output voltage signal of the DC / DC converter main circuit 1 and the output voltage signal of the fuel cell voltage source E are simultaneously output to the DSP system 202;

[0061] The current sensor 204 collects the current signal of the inductor L1 a...

specific Embodiment approach 3

[0063] Specific implementation mode three: the following combination figure 1 This embodiment will be described. In this embodiment, the high-gain fuel cell vehicle DC / DC converter described in the first embodiment will be further described. The capacitor C1 and the capacitor C2 have the same capacitance value.

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Abstract

A DC / DC convertor for a high-gain fuel cell vehicle relates to a DC convert and belongs to that field of design and application of a new energy vehicle power system. The invention solves the problem that the boost ratio of the DC / DC converter topology of the prior battery automobile is low and the output voltage is disturbed when the input voltage is wide. The invention introduces the feed-forwardcontrol of the input voltage, which cancels the disturbance to the output voltage when the input voltage varies in a wide range and does not have excessive cost. At that same time, the mathematical model is established by using the mean method of state space, When two basic topologies of upper bridge circuit and lower bridge circuit are used in parallel and 180 degree phase-shifting control is adopted, the current fluctuation of fuel cell is very small, which is beneficial to prolong the service life of fuel cell. Feedforward control of input voltage is introduced to cancel the disturbance ofoutput voltage when input voltage varies in a wide range. The present invention is suitable for use as a DC / DC converter.

Description

technical field [0001] The invention relates to a DC converter and belongs to the field of new energy vehicle power system design and application. 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. [0003] However, a DC / DC (direct current / direct current) converter must be added between the output terminal of the fuel cell and the DC bus to solve the shortcomings of the fuel cell's wide output voltage range and slow dynamic response, th...

Claims

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Application Information

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IPC IPC(8): H02M3/157H02M3/158
CPCH02M3/157H02M3/158
Inventor 吴晓刚于渤洋石文文
Owner HARBIN UNIV OF SCI & TECH
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