再谈llc串联谐振变换器
24页1、Delta Electronics (Shanghai) Design Center Alpha J. Zhang 章进法章进法 Shanghai, March 2010 LLC Series Resonant ConverterLLC Series Resonant Converter 再谈LLC串联谐振变换器再谈LLC串联谐振变换器 Delta Confidential Delta Electronics (Shanghai) Design Center PFC Rectifier DC/DC Converter 1. PFC rectifier for satisfying input harmonic current limit 2. 400v Bus voltage design for small bus capacitor selection 3. DC/DC Converter operates at 400v input at normal operation 4. DC/DC operates at lower input voltage when AC line
2、fails Typical Architecture of Switching Power Supply Delta Electronics (Shanghai) Design Center Efficiency Characteristic of Conventional Converters Single-end Forward Converter Dual-Switch Forward Converter Half-Bridge DC/DC Converter Full-Bridge DC/DC Converter Asymmetric H/B DC/DC Converter Phase-Shift F/B DC/DC Converter SPRC Bridge DC/DC Converters Conversion Efficiency Input Voltage Low Efficiency at High Input High Efficiency at Low Input High Effi. Low-In Low Effi. High-In Wanted Efficie
3、ncy Characteristics Delta Electronics (Shanghai) Design Center Ls Cs Cin S1 S2 Co TrD1 D2 1. Whole range ZVS for switches and ZCS for rectifiers 2. Wide range operation and higher efficiency for higher input 3. 96% efficiency under variable frequency control 4. Magnetic integration and smaller size LLC-Series Resonant Converter - LLC-SRC Delta Electronics (Shanghai) Design Center S1 S2 iLb iLs iC1 vc vp iLm Ls Cs S1 S2 Tr iC1 iLs D1 D2 Co iLb Lm vc vp Cin Mode I Operation Analysis of LLC-SRC Con
4、verter Delta Electronics (Shanghai) Design Center S1 S2 iLb iLs iC1 vc vp iLm Ls Cs S1 S2 Tr iC1 iLs D1 D2 Co iLb Lm vc vp Cin Mode II Operation Analysis of LLC-SRC Converter Delta Electronics (Shanghai) Design Center S1 S2 iLb iLs iC1 vc vp iLm Ls Cs S1 S2 Tr iC1 iLs D1 D2 Co iLb Lm vc vp Cin Mode III Operation Analysis of LLC-SRC Converter Delta Electronics (Shanghai) Design Center S1 S2 iLs iLb iC1 Ls Cs Cin S1 S2 Tr iC1 iLs D1 D2 Co iLb Typical Operation Current Waveforms: Delta Electronics
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