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Research on Bi-directional Dc-dc Converters for Hybrid Electric Vehicle

Author: HuJianMing
Tutor: ChenYuanZuo
School: South China University of Technology
Course: Power Electronics and Power Drives
Keywords: Bi-directional DC \\ DC converter Hybrid cars Circuit topology Phase shift plus PWM control
CLC: TM46
Type: Master's thesis
Year: 2010
Downloads: 341
Quote: 0
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Abstract


In recent years , with the rapid development of China's automobile industry , environmental pollution , energy shortages , the pressure of global warming to the traditional internal combustion engine vehicles facing unprecedented challenges . Hybrid vehicles in terms of technical, economic and environmental advantages, is an effective way to alleviate these problems . Improve the hybrid system control strategy , especially automotive power systems , improve fuel economy and an important means of reducing pollution emissions , while the bi-directional DC / DC converter when the car 's power system part . First, the paper analyzes the working principle of bi-directional DC / DC converter , comparison of the full-bridge topology , the characteristics of the half-bridge topology , the introduction of a new half-bridge bidirectional DC / DC converter , and to explore the PWM plus phase shift control applications to the improvement of the half-bridge bidirectional DC / DC converter . Phase shift with the traditional control compared to PWM plus phase shift control can no external additional components to achieve soft switching converter can reduce the voltage and current stress and conduction loss , a very wide range of load regulation . Secondly , based on the bidirectional DC / DC converter a cycle modal analysis , the paper proposes a PWM plus phase shift control method combined with the state average model of the switching function and equivalent circuit modeling method . The order of the equation of state from high to low-cost , and simplify the process of analysis and calculation . Then given the bi-directional DC / DC converter leakage inductance value calculation process , and use the simulation software SIMetrix simulation model of the bidirectional DC / DC converter . Finally, given the bi-directional DC / DC converter main circuit element parameters to select the principles and design methods , design phase shift plus PWM control circuit and switch control drive circuit , the converter in boost constant voltage control work , constant current control buck working to achieve a good control of the two modes . Design a 100w prototype , test results show that the bi-directional DC / DC converter modeling , theoretical analysis , the correctness of the design .

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter
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