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Simplified Analysis and Design of Seriesresonant LLC Half-bridge Converter

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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

Half-bridge

Driver

Center-tapped output with full-

wave rectification

(low voltage and high current)

Vin

Vout

LLC tank circuit

Preferably integrated into a single

magnetic structure

Vout

3 reactive elements, 2 resonant frequencies

fr1

⋅ π⋅

⋅

⋅ π⋅

( Ls

Lp)

⋅

Single-ended output with

bridge rectifiication

(high voltage and low current)

f r1

f r2

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

fr2

I&PC Div. - Off-line SMPS Appl. Lab

LLC Resonant Half-bridge

Waveforms at resonance (f

= f

)

Dead-time

Gate-drive

signals

HB mid-point

Voltage

Resonant cap

voltage

Tank circuit current is sinusoidal

Magnetizing current is triangular

Transformer

currents

Diode

voltages

CCM operation

Output current

Diode

currents

I&PC Div. - Off-line SMPS Appl. Lab

LLC Resonant Half-bridge

Switching details at resonance (f

= f

)

Dead-time

Gate-drive

signals

ZVS !

HB mid-point

Voltage

Resonant cap

voltage

Tank circuit current >0

Transformer

currents

Magnetizing current

V(D1)<0

Diode

voltages

I(D1)=0

ZCS !

Diode

currents

I&PC Div. - Off-line SMPS Appl. Lab

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: leisheng169; 非常详细的介绍了半桥llc的相关知识点，值得尝试; 2019-08-29 17:21:40回复

: gwl2603; 非常感谢分享; 2018-05-24 10:17:50回复

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Simplified Analysis and Design of Seriesresonant LLC Half-bridge Converter

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