LLC Resonant Half Bridge Converter

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Gain 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 Impacts of Circuit Parameters 0 0.1 1 10 fn, (Ln =1) L n =1 Qe=0.1 Qe=0.2 Qe=0.5 Qe=0.8 Qe=1 Qe=2 Qe=5 Qe=8 Qe=10 ZCS/ZVS Gain 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0.1 1 10 fn, (Ln =5) L n =5 Qe=0.1 Qe=0.2 Qe=0.5 Qe=0.8 Qe=1 Qe=2 Qe=5 Qe=8 Qe=10 ZCS/ZVS Gain 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 L n =10 Qe=0.1 Qe=0.2 Qe=0.5 Qe=0.8 Qe=1 Qe=2 Qe=5 Qe=8 Qe=10 ZCS/ZVS 0 0.1 1 fn 10 Gain Change with Ln and Qe - Ln increase with Qe constant (designed Lr, Cr, and operational RL), - flat, - magnitude shift-up, - frequency value at peak-gain moving towards more left, - less “frequency-selective” - wide frequency variation from no load to full load (more discussion later) Ln somewhere 3 to 5 look best balance between peak gain and frequency change – can be initially pick-up
LLC Resonant Converter Operation for design consideration • Operation/design with no load and minimum gain at a1 • Operation /design with full load and maximum gain at a3 • All gain curves cross at unity at f n =1, or f=f 0 • Qe design consideration at Heavy load, OCP, Short Circuit
Page 1 and 2: LLC Resonant Half Bridge Converter
Page 3 and 4: Design Challenges for DC/DC • Hig
Page 5 and 6: LLC Resonant Converter with Wide Op
Page 7 and 8: Operation Principle Above Resonant
Page 9 and 10: LLC Resonant Converter Gain Functio
Page 11 and 12: LLC Resonant Converter with Wide Op
Page 13: Gain Characteristics with Ln and Qe
Page 17 and 18: Design Consideration -1: Primary RM
Page 19 and 20: Design Consideration -3: Zero Volta
Page 21 and 22: Trade-off Design of Dead Time Condu
Page 23 and 24: Design Flow Chart for LLC Resonant
Page 25 and 26: Design - Soft start Soft start is
Page 27 and 28: Feedback Loop Design - Measure G m
Page 29 and 30: UCC25600 Resonant Half Bridge Contr
Page 31 and 32: Test based on EVM (UCC25600EVM)
Page 33 and 34: Test with EVM: Ripple and Hiccup
Page 35 and 36: Test with EVM: Efficiency and Load

LLC Resonant Half Bridge Converter

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