大功率移相全桥软开关电源的设计

工程硕士学位论文

大功率移相全桥软开关电源的设计 THE DESIGN ON SOFT SWITCHING POWER SUPPLY WITH HIGH POWER PHASE-SHIFTED FULL-BRIDGE

雷连方

哈尔滨工业大学

2006年12月

国内图书分类号 : TM92

国际图书分类号: 621.38

工程硕士学位论文

大功率移相全桥软开关电源的设计

硕士研究生：雷连方

导师：刘瑞叶 教授

副导师：肖连存 高工

申请学位：工程硕士

学科、专业：电气工程

所在单位：中国科工集团第三总体设计部

答辩日期：2006年12 月

授予学位单位：哈尔滨工业大学

Classified Index: TM92

U.D.C: 621.38

Dissertation for the Master Degree in Engineering THE DESIGN ON SOFT SWITCHING POWER SUPPLY WITH HIGH POWER PHASE-SHIFTED FULL-BRIDGE

C a n d i d a t e：Lei Lianfang

Supervisor：Prof. Liu Ruiye

Associate Supervisor：Senior Engineer Xiaolianchun Academic Degree Applied for：Master of Engineering Speciality：Electrical Engineering Affiliation：The 3rd Headquarters of China

Aerospace Science Industry

Company

Date of Defence：December,2006

Degree-Conferring-Institution：Harbin Institute of technology

哈尔滨工业大学工程硕士学位论文

摘 要

软开关技术取代硬开关技术是电力电子行业发展的必然趋势。移相全桥软开关电源的研制在设备的小型化、系统向多平台的扩展等方面具有很好的发展前景。移相全桥零电压零电流开关（ZVZCS）技术可以克服零电压全桥PWM变换器的高环流损耗、占空比丢失严重、滞后桥臂软开关受负载范围限制的缺点。

为了解决大功率电源的电磁兼容问题，从选择主电路拓扑、确定控制方案等方面入手，对大功率变换器的主流电路拓扑结构、工作原理和电路特性做了较深入的分析后，选择以饱和电感来改进全桥变换器主电路拓扑结构、以移相控制集成电路UC3875作为主控芯片、以移相控制方式作为控制方案来设计主电路、控制电路及保护电路。在结构设计时，充分考虑了系统的电磁兼容性能，设计并制作出大功率移相全桥软开关电源的原理样机，开关电源的输出功率约3.5千瓦。

为了验证原理样机的性能，对样机进行了性能试验和电磁兼容指标测试，并利用Matlab仿真软件中的Simulink模块对选用的主电路拓扑进行仿真建模和仿真运算，实验结果表明，设计方案有效，指标达到了设计要求，电磁兼容性能有了很大的改善。

利用ZVZCS技术设计完成的大功率移相全桥软开关电源弥补了以往军用电源的缺陷，在电磁兼容性方面有了极大的改进，减弱了对周围设备的电磁干扰，增强了导弹火控系统的可靠性。

关键词 开关电源；移相全桥变换器；零电压零电流开关；仿真

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哈尔滨工业大学工程硕士学位论文

Abstract

The technology of soft switched converter will replace that of hard switched converter. It’s the necessity trend in the area of electron. The developing of the PSFB soft switched converter makes it possible, such as miniaturization facilities, system expanding to more interfaces. The PSFB soft switched converter has good foreground. Phase-Shifted Full-Bridge Zero-voltage-zero-current-switching (PSFB ZVZCS) technology is adopted in this paper. This technology overcomes the defects of the Zero-voltage-switching (ZVS) FB Pulse-Width-Modulation (PWM) converter, such as the wastage of the high circulating energy, bad loss of the duty cycle, limitation of lagging-leg switches by the ZVS load range.

For solved the Electro Magnetic Compatibility (EMC) of high power supply, it is analyze in the process of choosing main circuit topology and ordering system precept for the main circuit topology, the working principle, the circuit characteristics. This paper focuses on the design of Phase-Shifted Full-Bridge (PSFB) soft switched DC/DC converter, main circuit, control circuit, protect circuit. It uses ZVZCS converter of using a saturable inductor as the main circuit topology. It uses Phase-Shifted control integrate circuit UC3875 as kernel controller. It uses Phase-Shifted control model as system precept. In the design of configuration, it is made the best of the design of Electro Magnetic Compatibility. The principium pattern of PSFB soft switched converter with high power has been made. The export power of this high power converter is 3.5 kW.

For result the performance of the principium pattern, it is tested for performance or EMC. By use of the Simulink block in Matlab simulate software, the simulate modeling of the selected main topology configuration and the simulate calculations are accomplished. The examination results of the principium pattern and the results of the simulate calculations are contrasted. It proves that the system precept is validity, that the EMC is greatly improved.

The high power PSFB soft switched converter with ZVZCS technology overcomes the defects of the old electrical source in army. It’s Electro Magnetic Compatibility has been improved on largely. The electromagnetism disturb to

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