Fuel cell direct current-direct current converter and control method thereof

A technology of DC converter and fuel cell, which is applied in the direction of converting DC power input to DC power output, collectors, and adjusting electric variables. It can solve problems such as ineffective release, reduced output efficiency, and large ripples, and achieve small Ripple, reduced output current ripple, low loss effect

Pending Publication Date: 2018-05-18
深圳青铜剑科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the field of electric vehicle development, hydrogen fuel cells have received sufficient attention and application in the application of electric vehicles due to their zero-pollution and zero-emission characteristics. The fuel cell DCDC converter on the market has low efficiency and large ripple when charging the power battery. At the same time, when the internal charge of the fuel cell reaches a certain value during normal operation, it cannot be effectively released, resulting in a decrease in its output efficiency.

Method used

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  • Fuel cell direct current-direct current converter and control method thereof
  • Fuel cell direct current-direct current converter and control method thereof
  • Fuel cell direct current-direct current converter and control method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] This embodiment provides a fuel cell DCDC converter with high efficiency, wide range and low ripple, such as figure 1 As shown, it includes the filter energy storage capacitor Cin connected to the DC input terminal, two parallel BUCK energy release compound circuits, the full bridge circuit after the BUCK energy release compound circuit, the BOOST booster circuit and the control method of each circuit.

[0023] The first BUCK energy release compound circuit includes power switch tubes Q1 and Q2, inductor L1 and capacitor C1; one end of the power switch tube Q1 is connected to the positive end of the filtering energy storage capacitor Cin, and the other end is connected to the power switch tube Q2 and the positive end of the filter energy storage capacitor Cin. The inductance L1 is connected, the inductance L1 and the capacitor C1 are connected in parallel to the power switch tube Q2 after being connected in series, the other end of the power switch tube Q2 and the other ...

Embodiment 2

[0037] This embodiment is a fuel cell 40kW DCDC converter, which requires a wide range of 90V-240V input, 400V-750V output, and an efficiency of over 93%. It adopts a 10kW single-module four-parallel design, and its modules are as follows: Figure 9-10 shown.

[0038] The difference between this embodiment and Embodiment 1 is that in the BUCK energy release composite circuit, the input filter energy storage capacitor Cin is realized by using three 10uF / 500VDC C3D capacitors connected in parallel to meet the requirements of use; the power of Q1, Q2, Q3, and Q4 Low-loss SiC-MOSFET is selected as the switching tube. Considering that the current single flow capacity of SiC-MOSFET is small, each switching tube is realized by parallel connection of two SiC-MOSFET tubes with a rated voltage of 600V and a rated current of 130A; inductors L1 and L2 A sendust core reactor with a rated inductance of 4.5uH and a rated current of 90A is selected; capacitors C1 and C2 are implemented in par...

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Abstract

The invention discloses a fuel cell direct current-direct current converter and a control method thereof. The fuel cell direct current-direct current converter comprises a filter energy storage capacitor which is connected with the direct current input end, a first BUCK energy-releasing compound circuit, a second BUCK energy-releasing compound circuit, a first full-bridge circuit, a second full-bridge circuit and a BOOST circuit, wherein the first BUCK energy-releasing compound circuit and the second BUCK energy-releasing compound circuit are in parallel connection, the first full-bridge circuit is at the back stage of the first BUCK energy-releasing compound circuit, the second full-bridge circuit is at the back stage of the second BUCK energy-releasing compound circuit, and the BOOST circuit is in series connection with the first full-bridge circuit and the second full-bridge circuit. By means of the fuel cell direct current-direct current converter and the control method thereof, the BUCK circuits and the energy-releasing circuits are compounded, the output current ripple of a fuel cell can be reduced, and the problem that the output capacity is occupied when electric charges are accumulated inside the fuel cell can also be solved, so that the main topology has the advantages of having low loss, high efficiency and small ripple waves.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a DC-DC converter and a control method thereof. Background technique [0002] Since entering the 21st century, the problem of environmental pollution has received more and more attention from all walks of life, and energy transformation is the top priority to solve the problem of environmental pollution. With the continuous development of new energy sources, the highly polluting automobile industry has also reached a turning point in energy reform. At present, many countries have launched a plan for the withdrawal of fuel vehicles from the market. replaced by electric vehicles. In the field of electric vehicle development, hydrogen fuel cells have received sufficient attention and application in the application of electric vehicles due to their zero-pollution and zero-emission characteristics. The fuel cell DCDC converter on the market has low efficiency and large ripple when c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/15H02J7/00
CPCH02M1/15H02M3/33576H02J2207/20H02M1/0067Y02B70/10
Inventor 王运何强蒋成明于洋雷仕建
Owner 深圳青铜剑科技股份有限公司
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