一种适用于宽范围输出的复合谐振型全桥变换器  

A Compound Resonant Full-bridge Converter Suitable for Wide Range Output

作　　者：袁义生 赖立 YUAN Yisheng;LAI li(School of Electrical and Automation Engineering,East China Jiaotong University,Nanchang 330013,Jiangxi Province,China)

机构地区：[1]华东交通大学电气与自动化工程学院,江西省南昌市330013

出　　处：《中国电机工程学报》2020年第20期6694-6703,共10页Proceedings of the CSEE

基　　金：国家自然科学基金项目(52067007);江西省自然科学基金项目(20181BAB206033)。

摘　　要：该文提出一种适用于宽范围输出的复合谐振型全桥变换器。该变换器在传统全桥电流馈变换器基础上,增加输入电感的副边绕组构成Flyback模态,在主变压器侧串联电容构成LC谐振模态,通过对输入电感和开关管复用,实现Boost储能、LC谐振、Flyback模态3个模态。各个模态的组合可实现高、中、低3种电压增益,由此可拓宽电压增益范围和提高功率密度。与传统LLC变换器相比,该变换器采用PWM控制,励磁电感对电压增益无影响,且开关管均可在全负载范围和全输出电压内实现软开关状态,同时Flyback模态的引入降低了低增益、低功率工况下损耗。文中首先利用时域详细分析分析变换器各个电压增益模式的工作过程和电压增益。其次以100V输入和50~150V输出的实验样机为例,给出变换器设计和控制方法。实验结果验证了该变换器分析的有效性。A composite resonant full-bridge converter suitable for a wide range of outputs was proposed. Based on the traditional full-bridge current-fed converter, the converter adds a secondary winding of the input inductor to form a Flyback mode, and a series capacitor on the main transformer side constitutes an LC resonant mode. By multiplexing the input inductor and the switching transistor, realize the Boost storage Energy, LC resonance, Flyback mode three modes. The combination of the various modes enables high, medium and low voltage gains, therefore the range of voltage gain can be broadened and the power density can be increased. Compared with the traditional LLC converter, the converter adopts PWM control, the magnetizing inductance has no influence on the voltage gain, and the switching tube can realize the soft switching state in the full load range and the full output voltage, and the introduction of the Flyback mode is reduced loss in low gain, low power conditions. Firstly, the working process and voltage gain of each voltage gain mode of the converter were analyzed by using time domain detailed analysis. Secondly, the experimental design of 100 V input and 50~150 V output was taken as an example. The design and control method of the converter were given. The experimental results verified the effectiveness of the converter.

关 键 词：变换器 BOOST LC谐振 FLYBACK 宽范围输出 

分 类 号：TM464[电气工程—电器]