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Simplified Analysis and Design of Seriesresonant LLC Half-bridge Converter

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  • 日期: 2015-07-11
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标签: LLC

LLC串联谐振半桥拓扑的分析与设计

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Simplified Analysis and Design of Series resonant LLC Halfbridge Converters MLD GROUP INDUSTRIAL POWER CONVERSION DIVISION Offline SMPS BU Application Lab IPC Div Offline SMPS Appl Lab Presentation Outline LLC seriesresonant Halfbridge operation and significant waveforms Simplified model FHA approach 300W design example IPC Div Offline SMPS Appl Lab Seriesresonant LLC HalfBridge Topology and features Vin e g d i r b f l a H r e v i r D Q1 Cr Ls Q2 Lp LLC tank circuit Preferably integrat......

Simplified Analysis and Design of Series- resonant LLC Half-bridge Converters MLD GROUP INDUSTRIAL & POWER CONVERSION DIVISION Off-line SMPS BU Application Lab I&PC Div. - Off-line SMPS Appl. Lab Presentation Outline • LLC series-resonant Half-bridge: operation and significant waveforms • Simplified model (FHA approach) • 300W design example I&PC Div. - Off-line SMPS Appl. Lab Series-resonant LLC Half-Bridge Topology and features Vin e g d i r b - f l a H r e v i r D Q1 Cr Ls Q2 Lp LLC tank circuit Preferably integrated into a single magnetic structure 3 reactive elements, 2 resonant frequencies fr1 fr2 2 p 2 p 1 Ls Cr 1 Lp+ Ls ( ) Cr > f r1 f r2 Center-tapped output with full- wave rectification (low voltage and high current) Vout Vout Single-ended output with bridge rectifiication (high voltage and low current)  Multi-resonant LLC tank circuit  Variable frequency control  Fixed 50% duty cycle for Q1 & Q2  Dead-time between LG and HG to allow MOSFET’s ZVS @ turn-on  fsw » fr, sinusoidal waveforms: low turn-off losses, low EMI  Equal voltage & current stress for secondary rectifiers; ZCS, then no recovery losses  No output choke; cost saving  Integrated magnetics: both L’s can be realized with the transformer.  High efficiency: >96% achievable I&PC Div. - Off-line SMPS Appl. Lab (cid:215) (cid:215) (cid:215) (cid:215) (cid:215) (cid:215) LLC Resonant Half-bridge Waveforms at resonance (fsw = fr1) Dead-time Tank circuit current is sinusoidal Magnetizing current is triangular CCM operation Output current I&PC Div. - Off-line SMPS Appl. Lab Gate-drive signals HB mid-point Voltage Resonant cap voltage Transformer currents Diode voltages Diode currents LLC Resonant Half-bridge Switching details at resonance (fsw = fr1) Dead-time ZVS ! Tank circuit current >0 Magnetizing current V(D1)<0 I(D1)=0 ZCS ! I&PC Div. - Off-line SMPS Appl. Lab Gate-drive signals HB mid-point Voltage Resonant cap voltage Transformer currents Diode voltages Diode currents
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