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LLC resonant converter
Active Resonant Rectifier Output bridge I tank filter cQo ZVS preferred for mOshe士 variable frequency, fixed duty cycle Resonant(sine)mode power transfer Opportunities for improvement Advantages Low switching loss Higher fs and high power densit PWM Converter: PWM Averaging with Low Pass filter f fo<<fs fo Resonant Converter: Frequency Selection with Band pass filter fs is close to fo fo f Vin=3001 Full Load Q1 Q2 TTT厂 1 11 81 10 Vin=400v Full load 10 in=300-10 perating du L 101 12u Range Vin=400T F , 300V 400V f/f T置1,314星. Vin=300v Full Load Q1 C Q2 Vin=400v Full Load LD 20 Operatins Ra ange Vin=300] Vin=400T 300V 400V 91,01.1 21,3 s Vin=300v Full Load 5.55 Q2 1 11 Vin=400v Full Load Vo/in 555 Q=RIZo R Q-3 11 41 61 ;""""" i Operating n 3 Range Lin=300F 05 Vin=4001 300V 400V 0.8 14 s/O Vin=300V Full load Q1 D1 lo Vin DS h5b Lms np TTT「T「 II ns 15u Circulating VinE4oov Full load D2 energy DC Characteristic of llc resonant conveter Q=2 18 Operating :=05-1 Range 口03 16 Ps=D ju 10u 15u 14 Vin=3(0v Low voltage stress on output rectifier .1/…2…-11 08 Hin=ifor. Less circulating energy 0F… Insensitive to load change Zero to Full load Zvs capability 4n50sD708 1.1 .No diode reverse recovery problem Switching Freda Cr n:1:1 Vo Vin RL 0 2丌√LC, 2 R Resonant Frequency Inductor Ratio Quality factor

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