Zero-Voltage- and Zero-Current-Switching with Series Resonance in FB Converter Utilizing Leakage Inductance

Presented by:

Joemon Raju Joseph KReg No.- 09HN026

M tech PE & D

Guided By:

Dr. S Suresh Kumar(Professor and Head)

Dept. of EEE

Apr 13, 2023 1

Overview

• ZVS and ZCS• Literatures on ZV-ZCS• Base Paper Concept & Methodology• Simulation• Summary• Proposed Modification• References

Apr 13, 2023 2

Overview

• ZVS and ZCS• Literatures on ZV-ZCS• Base Paper Concept & Methodology• Simulation• Summary• Proposed Modification• References

Apr 13, 2023 3

Zero Voltage Switching &

Zero Current Switching

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Merits

– Lossless switching transition

– Reduced EMI/RFI during switching due

to transition

– Short circuit toleration

– Reduction in switching stresses

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Overview

• ZVS and ZCS

• Literatures on ZV-ZCS• Base Paper Concept & Methodology• Simulation• Summary• Proposed Modification• References

Apr 13, 2023 6

ZCS Circuit Methodology

Apr 13, 2023 7

Fig: 1 – Converter with hard switching Auxiliary Circuit

Fig:2- Fully resonant auxiliary circuit Reference [5]

ZVS Circuit Methodology

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Reference [13]

Fig:3 FB Converter with ZVS

ZV-ZCS Circuit Methodology

• Using Additional Auxillary Circuits

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Reference [11]Fig:4 FB Converter with Auxiliary Voltage Source

• Using Series Resonant Converters

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Fig:5 HB LCL-T ResonantConverter Reference [16]

Preference for ZV-ZCS Topologies

• ZCS circuits – Auxiliary circuit Conduction losses, voltage stresses in boost diode

• ZVS circuits – high circulating losses, high valued inductor with increase in power

Apr 13, 2023 11

• Choice of IGBT– Has lower cost considering high power and

high voltage applications .– ZVS realizable by adding additional

lossless turn off snubber in parallel

Apr 13, 2023 12

Overview

• ZVS and ZCS• Literatures on ZV-ZCS

• Base Paper Concept & Methodology• Simulation• Summary• Proposed Modification• References

Apr 13, 2023 13

ZV-ZCS FB Converter with Secondary Resonance

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• Concept– SRC based circuit– Leakage inductance of transformer participates

in resonance– Turn-on of leading legs possible under all

operating conditions and lossless snubber reduces their turn off losses

– Lagging legs can be turned on at ZV and turned off near ZC without additional aux. circuits

Apr 13, 2023 15

Control Signal

• Phase Shifted PWM • Normal PWM

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Apr 13, 2023 17

Circuit Operation•Mode-1

im(t) = ip(t) = iT1(t) = −iT2(t) = im(t0) ...(1)

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•Mode-2

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is(t) = sin ωr(t − t1) x nVin − (Vo − Vc(t1))/Zo …(2)

ωr = 2πfr = 1/√(LlkCr) …(angular resonance frequency)

Zo = √(Lr / Cr) …(Characteristic Impedance)

im(t) = im(t1) + (Vin/Lm) x (t − t1) ….(3)

ip(t) = im(t) + nis(t) = iT1(t) = iB2(t) ....(4)

Apr 13, 2023 20

•Mode-3

is(t) = is (t2) cos ωr(t − t2) − [Vo − Vc(t2)] x sin ωr(t − t2)/Zo …(5)

ip(t) = im(t) + nis (t) = −iB1(t) = iB2(t) ...(6)

Apr 13, 2023 21

Operation Waveforms

tot1 t2

t3

t4t5 t6

Other Design Factors

Frequency Ratio: F = fr/fs

Quality Factor: Q =4ωrLlk/Ro

tch= (CT1+CB1) x Vin/ (Ip1+ Im2max)… Charging time of Capacitance

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Overview

• ZVS and ZCS• Literatures on ZV-ZCS• Base Paper Concept & Methodology

• Simulation• Summary• Proposed Modification• References

Apr 13, 2023 23

Assumptions for Analysis

• Ideal Switches• Ripple free Input Voltage• Ideal transformer with magnetizing and

leakage inductances alone• Frequency ratio, F=1

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PSIM Model

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Control Signal

Model Parameters

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Parameters Symbol Value

Input Voltage Vin 350

Transformer Turns ratio N1:N2 13:10

Magnetizing Inductance Lm 300uH

Leakage Inductance Llk 15.7uH

Quality Factor Q 0.62

Resonant Frequency fr 38.3kHz

Switching Frequency fr 38.3kHz

Resonant Capacitor Cr 1.1uF

Snubber Capacitor CT1, CB1 6.8nF

Phase Shifted PWM Generation

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Apr 13, 2023 28

Carrier Wave ParametersSwitch T1tr B1tr T2tr B2trVp-Vp 2 2 2 2

Frequency 38300 38300 38300 38300

Duty Cycle 0.8 0.8 0.8 0.8DC offset 1 1 1 1

Tstart 0 0 0 0Ph. delay -143.25 -71.5 580 -68.8

Modulating DC

T1DC B1DC T2DC B2DC

2.025 1.975 2.025 1.975

Simulation Results

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Phase Shifted PWM Signals

Simulation Results

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Switching Currents

ZVS ON

ZCS OFF

ZVS ON

Overview

• ZVS and ZCS• Literatures on ZV-ZCS• Base Paper Concept & Methodology

• Summary• Proposed Modification• References

Apr 13, 2023 31

• Inference from Literatures: o ZV-ZCS has upper hand in effectiveness rather

than ZVS or ZCS aloneo IGBT is preferable for high power application

• Inference from Base Paper:o Transformer design plays a crucial role for ZV-

ZCS to avoid additional inductor

Apr 13, 2023 32

Overview

• ZVS and ZCS• Literatures on ZV-ZCS• Base Paper Concept & Methodology• Methodology• Summary

• Proposed Modification• References

Apr 13, 2023 33

Intended Modification

Realization of the concept with Bridge rectifier at

the transformer secondary.

Apr 13, 2023 34

Projected Circuit Configuration

References

1. Eung-Ho Kim and Bong-Hwan Kwon,” Zero-Voltage- and Zero-Current-Switching Full-Bridge Converter With Secondary Resonance”, IEEE Trans. Ind. Electron., vol. 57, no. 3, pp. 1017–1025, Mar. 2010.

2. X. Wu, J. Zhang, X. Ye, and Z. Qian, “Analysis and derivations for a family ZVS converter based on a new active clamp ZVS cell,” IEEE Trans. Ind. Electron., vol. 55, no. 2, pp. 773–781, Feb. 2008.

3. J. J. Lee, J. M. Kwon, E. H. Kim, and B. H. Kwon, “Dual series resonant active-clamp converter,” IEEE Trans. Ind. Electron., vol. 55, no. 2, pp. 699–710, Feb. 2008.

4. C. M. Wang, “A novel ZCS-PWM flyback converter with a simple ZCSPWM commutation cell,” IEEE Trans. Ind. Electron., vol. 55, no. 2, pp. 749–757, Feb.

2008.5. X. Wu, X. Xie, C. Zhao, Z. Qian, and R. Zhao, “Low voltage and current stress

ZVZCS full bridge DC–DC converter using center tapped rectifier reset,” IEEE Trans. Ind. Electron., vol. 55, no. 3, pp. 1470–1477, Mar. 2008.

6. M. Borage, S. Tiwari, and S. Kotaiah, “LCL-T resonant converter with clamp diodes: A novel constant-current power supply with inherent constant-voltage limit,” IEEE Trans. Ind. Electron., vol. 54, no. 2, pp. 741–746, Apr. 2007.

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7. J. T. Matysik, “The current and voltage phase shift regulation in resonant converters with integration control,” IEEE Trans. Ind. Electron., vol. 54, no. 2, pp. 1240–1242, Apr. 2007.

8. E. Adib and H. Farzanehfard, “Family of zero-current transition PWM converters,” IEEE Trans. Ind. Electron., vol. 55, no. 8, pp. 3055–3063, Aug. 2008.

9. E. H. Kim and B. H. Kwon, “High step-up push-pull converter with high efficiency,” IET Power Electron., vol. 2, no. 1, pp. 79–89, Jan. 2009.

10. Y. Tsuruta, Y. Ito, and A. Kawamura, “Snubber-assisted zero-voltage and zero-current transition bilateral buck and boost chopper for EV drive application and test evaluation at 25 kW,” IEEE Trans. Ind. Electron., vol. 56, no. 1, pp. 4–11, Jan. 2009.

11. J. L. Russi, M. L. S. Martins, and H. L. Hey, “Coupled-filter-inductor soft-switching techniques: Principles and topologies,” IEEE Trans. Ind. Electron., vol. 55, no. 9, pp. 3361–3373, Sep. 2009.

12. T. Citko and S. Jalbrzykowski, “Current-fed resonant full-bridge boost DC/AC/DC converter,” IEEE Trans. Ind. Electron., vol. 55, no. 3, pp. 1198–1205, Mar. 2008.

13. Yungtaek Jang, Milan M. Jovanovic and Yu-Ming Chang, ”A New ZVS-PWM Full-Bridge Converter,” IEEE Trans. Power Electronics, Vol. 18, No. 5,pp.1122-1129, Sep 2003

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