LLC谐振分析

【实例简介】
非常详细的LLC谐振分析，电路工作步骤过程及计算推理详解
Series-resonant LLC Half-Bridge st pivate Topology and features Q1 Center-tapped output with full-wave C rectification Multi-resonant LLC tank circuit low voltage and high current) n a Variable frequency control Fixed 50%o duty cycle for Q1&Q2 」片本Q2 Vout Dead-time between LG and Hg to allow MOSFETs ZVs turn-on LC tank circuit ■fsW⊕fr, sinusoidal| waveforms:|ow turn-off losses low EMi ↑■ Equal voltage& current stress for Preferably integrated into a single Vout secondary rectifiers; ZCS, then no magnetic structure recovery losses No output choke; cost saving 3 reactive elements, 2 resonant frequencies Single-ended output with bridge rectification a Integrated magnetics: both L's can 12.≠ VLS. Cr Chigh voltage and low current) be realized with the transformer f>t a High efficiency: >96% achievable r 2 2≠y(Ls+Lp)C I&PC Div,- Off-line SMPS App/ Lab LLC Resonant Half-bridge st pivate Waveforms at resonance (fsw=frD) HVG LVG Dead-time 1.00 030 080 Gate-drive 040}--------- signals 0.20-- “““““““==F“====““=====-+1===-=-= 0 Vfgnd Vc HB mid-point 40000 300.00 Voltage 200.00卜---- ----1-------- 100.00 Resonant cap 000 100.00 voltage Tank circuit current is sinusoidal Magnetizing current is triangular I(Ls) Lp 150 1.00 050 Transformer 000 0.50 currents 1.50 VD1 VD2 20.00 10.00 Diode 0.00 voltages 10.00 ===b============ CCM operation Output current I (D1) I(D2) 600 === 400 Diode 200 currents g700 g7500 98000 98500 9g000 99500 100000 Time (us) l&PC Div,-Off-line SMPs App/ Lab LLC Resonant Half-bridge st pivate Switching details at resonance(f SW 1r1 080 Dead-time 060 --------4 Gate-drive 0.40 020 signals 0.00 ZVS I Vfgnd vo 400.00 HB mid-point 30000------ 200.00 Voltage 100.00 Resonant cap 0.D0 100.00 voltage Tank circuit current >0 7.4n (Ls) (Lp) Transformer currents 0. Magnetizing current VD1)<0 VD1 VD2 10.00 Diode 0.00 voltages 1000 20.00 121)=0 ZCS I 3.0t 2.50 9 2.00 ===m== Diode 二1 currents g800D 98100 98150 98200 Time (us) l&PC Div,-Off-line SMPs App/ Lab LLC Resonant Half-bridge st pivate Operating Sequence at resonance(Phase 1/76 100LV 1/6 080 060 Q1OFF Q1 ON Q1 OFF Q1 020 Q2ON …Q2oFF Q2 ON Coss Ve Vigna 40000 3m00 Cr n ryY n:1:1 D1 Cout 10000 1c000 Coss Vout 100 150 Q2 000 D2 050 150 ■Q1isOF,Q2isON MCS1) KMOS2 150 000 D1 is OFF, D2 is ON; V(D1)=-2 Vout 050 a Lp is dynamically shorted V(Lp)=-nVout 100 150 a Cr resonates with Ls, fr1 appears a Output energy comes from Cr and Ls 们002 0000 Phase ends when Q2 is switched off 000 00500 I&PC Div,- Off-line SMPS App/ Lab LLC Resonant Half-bridge st pivate Operating Sequence at resonance(Phase 2/6 HUG LVG 2/6 100 080 060 Q1 OFF Q1 ON Q1 OFF Q1 020 Q2 ON …Q2OFF Q2ON… Coss Ve Vigna 40000 3m00 Cr n n:1:1 D1 Cout 10000 1c000 CoSS2. Lo Vout 100 150 Q2 000 D2 050 150 Q1 and Q2 are OFF(dead-time) MCS1) KMO 150 D1 and d2 are OFF: V(D1=V(D2)=0; 0 050 000 ransformer s secondary is open 050 100 150 aI(LSLp)charges Coss2 and discharges until V(COSs2=Vin; Q1s body diode 1102) 1000 800 starts conducting, energy goes back to Vin 00 400 (D2)is exactly zero at Q2 switch off 000 Phase ends when Q1 is switched on 08500 00500 I&PC Div,- Off-line SMPS App/ Lab LLC Resonant Half-bridge st pivate Operating Sequence at resonance(Phase 3/6 HVG LVC 3/6 100 060 Q1 OFF 040 Q1 ON Q1OFF 020 Q2 ON Q2 OFF Q2 ON 000 Coss 40000 30000 Cr 20000 n rry n:1:1 D1 1000 Cout 000 Coss Vout ( Lp I(Ls 150 050 Q2 D2 050 00 ■Q1isON,Q2 is OFF (MCS1) YMOS2) 150 100 a D1 is oN, D2 is OFF, V(D2)=-2Vout 050 000 060 a Lp is dynamically shorted V(Lp)=nOut 150 a Cr resonates with Ls, fr1 appears 01)102) ■工(Ls) flows through G1 s RDS(on)back to 1000 800 600…… Vin(Q1 is working in the 3rd quadrant 200 a Phase ends when I(Ls=O 000 200 986,0 99500 l&PC Div,-Off-line SMPs App/ Lab LLC Resonant Half-bridge st pivate Operating Sequence at resonance(Phase 4/6 HUG LVG 4/6 100 080 060 Q1 OFF Q1 ON Q1 OFF Q1 020 Q2 ON Q2 OFF Q2ON… Coss Ve Vigna 40000 3m00 Cr n n:1:1 D1 Cout 10000 1c000 Coss Vout 100 150 Q2 000 D2 050 150 Q1 is oN, Q2 is OFF MCS1) MO$2 150 a D1 is oN, D2 is OFF: V(D2)=-2 Vout 000 a Lp is dynamically shorted: V(Lp)=n Vout 050 100 150 a Cr resonates with Ls, fr1 appears I(Ls)flows through Q1's RDs(on from Vin 1)1D2 1000 800 to ground 00 400 Energy is taken from vin and goes to Vout 000 Phase ends when Q1 is switched off 08500 00500 I&PC Div,- Off-line SMPS App/ Lab LLC Resonant Half-bridge st pivate Operating Sequence at resonance(Phase 5/6 HUG LVG 5/6 100 080 060 Q1 OFF Q1 ON Q1 OFF Q1 020 Q2 ON …Q2OFF Q2ON… Coss Ve Vigna 40000 3m00 Cr n n:1:1 D1 Cout 10000 量0 Vout 100 150 000 D2 050 150 Q1 and Q2 are OFF(dead-time) MCS1) MO$2 150 a D1 and d2 are OFF: V(D1=VD(2=0; WU 050 000 ransformer s secondary is open 050 100 150 I(LS+Lp) charges Cossi and discharges 0552, until V(Coss2)=0: Q2's body diode 1)1D2 1000 800 starts conducting 00 400 I(D1)is exactly zero at Q1 switch off 000 Phase ends when Q2 is switched on 08500 00500 I&PC Div,- Off-line SMPS App/ Lab 【实例截图】
【核心代码】