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高效的LLC谐振变换器变模式控制策略
潘海燕1,2, 贺 超1, 蒋友明2, 陈国柱1
1.浙江大学 电气工程学院,浙江 杭州 310027;2.台州职业技术学院 电子电气工程系,浙江 台州 318000
摘要:
提出了LLC谐振变换器采用频率调制(FM)和脉冲宽度调制(PWM)的变模式控制策略。输入额定电压时变换器采用FM控制以获得最大性能效率;输入电压降低时,采用非对称占空比PWM控制使变换器处于反激变换模式,获得最大电压增益;在输入电压较高或负载较轻时,采用对称占空比PWM控制,实现全负载范围内开关管零电压开关(ZVS)和整流二极管零电流开关(ZCS),降低开关损耗。对变模式控制策略工作模式以及特性进行了分析,给出了控制方案电路框图。实验结果验证了变模式控制策略的可行性,变换器获得了更高性能效率和更高功率密度。
关键词:  变模式控制  脉冲宽度调制  频率调制  ZVS  ZCS  LLC谐振变换器  变换器
DOI:
分类号:
基金项目:基金项目:国家自然科学基金资助项目(51177147);浙江省重点科技创新团队项目(2010R50021)
Efficient variant mode control of LLC resonant converter
PAN Haiyan1,2, HE Chao1, JIANG Youming2, CHEN Guozhu1
1.College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China;2.Department of Electronic and Electrical Engineering,Taizhou Vocational &Technical College,Taizhou 318000,China
Abstract:
A strategy of variant mode control is proposed for LLC resonant converter,which adopts the FM(Frequency Modulation) control,when the rated voltage is inputted,to obtain the maximum performance efficiency;the asymmetric PWM(Pulse Width Modulation) control,when the input voltage is low,to operate in flyback mode for the maximum voltage gain;and the symmetric PWM control,when the input voltage is high or load is light,to realize the ZVS(Zero Voltage Switching) of power switch and the ZCS(Zero Current Switching) of rectifier diode for switching loss reduction covering whole load range. Its operating modes and characteristics are analyzed and the block diagram of control scheme is given. Experimental results show the converter obtains higher performance efficiency and higher power density,verifying the feasibility of the proposed strategy.
Key words:  variant mode control  pulse width modulation  frequency modulation  zero voltage switching  zero current switching  LLC resonant converter  electric converters

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