改进移相全桥变换器的新能源汽车车载充电机分析技术

Analysis Technology of New Energy Vehicle on-board Charger with Improved Phase Shift Full Bridge Converter

随着经济时代的发展,电动汽车逐渐成为社会共同关注的焦点。为了实现变换器的高效运行,研究提出一种集成功率解耦的前级功率因数校正(Power Factor Correction,PFC)交流/直流(Alternating Current and Direct Current,AC/DC)变换器的控制模型以吸收输出的侧脉动功率;其次提出一种改进移相全桥变换器策略以构建小信号模型,缓解电解电容问题。结果显示,随着运行时间的增加,突加负载下输入电流在一个循环后便达到稳定状态,而输出电压在0.01 s后逐渐出现稳定值,趋近于180 V;突减负载下变换器的输出电压在0.02 s后达到一个稳定的状态,同时变换器的输出电容容量在0.05 s左右开始减少;Simulink仿真模拟结果中,幅频与相频特性的曲线基本吻合。以上结果表明所构建车载充电机系统具有十分可靠的有效性,能够有效地消除直流侧脉冲功率,最终满足系统动静态性能要求。

With the development of the economic era,electric vehicles have gradually become the focus of social attention.In order to achieve efficient operation of the converter,a control model of a pre stage PFC AC/DC converter with integrated power decoupling is proposed to absorb the output side ripple power;Furthermore,a better phase shifted full bridge converter design is suggested in order to build a small signal model that solves the electrolytic capacitor issue..The results show that with the increase of operating time,the input current under sudden load reaches a stable state after one cycle,while the output voltage gradually reaches a stable value after 0.01 s,approaching 180 V;Under sudden load reduction,the output voltage of the converter reaches a stable state after 0.02s,and the output capacitance of the converter starts to decrease at about 0.05s;In the Simulink simulation results,the property of amplitude frequency and phase frequency curves basically coincide.The above results show that the vehicle charger system constructed has a very reliable and effective ability to effectively eliminate DC side pulse power,and ultimately meet the dynamic and static performance requirements of the system.