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Flyback Converter using PWM IC(LTspice Version)

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Flyback Converter using PWM IC(LTspice Version)

  1. 1. Bee Technologies http://www.bee-tech.info/ Design Kit Flyback Converter using PWM IC LTspice Version 1Copyright (C) Siam Bee Technologies 2015 02JUL2015
  2. 2. Contents 1. 50W Off-Line Adapter Circuit (VIN=85Vac) 1.1) Input Waveform 1.2) Output Waveform 1.3) Output Power 1.4) Gate Drive Output and Oscillator Timing (IC) 2. 50W Off-Line Adapter Circuit (VIN=110Vac) 2.1) Input Waveform 2.2) Output Waveform 2.3) Output Power 2.4) Gate Drive Output and Oscillator Timing (IC) 3. 50W Off-Line Adapter Circuit (VIN=265Vac) 3.1) Input Waveform 3.2) Output Waveform 3.3) Output Power 3.4) Gate Drive Output and Oscillator Timing (IC) 4. Transformer Specification 5. Operation Waveform (VIN=110Vac, Example) 5.1) Transformer Turn Ratio 5.2) Transformer Primary Side Inductance (LP) 5.3) VCC Output Waveform 5.4) MOSFET Switching Device (UQ101) 5.5) Output Rectifier Diode (D201 - D202) 5.6) Current Sensing and Feedback Circuit Conclusion Simulation Details Appendix A - Initial Condition Settings Appendix B - Bill of Materials Simulation Index 2Copyright (C) Siam Bee Technologies 2015
  3. 3. 1. 50W Off-Line Adapter Circuit (VIN=85Vac) - Simulation Circuit 3Copyright (C) Siam Bee Technologies 2015 .tran 0 50m 0 10n .Option Gmin=75E-9 .Option Abstol=1.0E-9 .Option Vntol=1.0u .Option Trtol=1000 .Option Method=Gear * Engine Solver: Alternate  Initial condition are set ,so the simulation starts near the steady state. VIN=85Vac V(Out) starts from 11V by the initial condition V(Vcc) starts from 12V
  4. 4. 1.1) Input Waveform - Simulation Result Copyright (C) Siam Bee Technologies 2015 4 Time [sec] VDC,AVG = 104.33V VAC = 85Vrms VDC, MIN = 85.8V
  5. 5. 1.2) Output Waveform - Simulation Result Copyright (C) Siam Bee Technologies 2015 5 The output voltage is regulated at 12.12V Time [sec] The output current is 4.04A (RL=3) V(Out) starts from 11V by the initial condition
  6. 6. 1.3) Output Power - Simulation Result Copyright (C) Siam Bee Technologies 2015 6 Time [sec] The simulation result shows the output power is 48.90W
  7. 7. 1.4) Gate Drive Output and Oscillator Timing (IC) - Simulation Result Copyright (C) Siam Bee Technologies 2015 7 Time [sec] VOSC Oscillator frequency = 105kHz PW = 3.877us
  8. 8. 2. 50W Off-Line Adapter Circuit (VIN=110Vac) - Simulation Circuit 8Copyright (C) Siam Bee Technologies 2015 .tran 0 50m 0 10n .Option Gmin=75E-9 .Option Abstol=1.0E-9 .Option Vntol=1.0u .Option Trtol=1000 .Option Method=Gear * Engine Solver: Alternate  Initial condition are set ,so the simulation starts near the steady state. VIN=110Vac V(Vcc) starts from 12V V(Out) starts from 11V by the initial condition
  9. 9. 2.1) Input Waveform - Simulation Result Copyright (C) Siam Bee Technologies 2015 9 Time [sec] VDC,AVG = 142.41V VAC = 110Vrms VDC, MIN = 128.621V
  10. 10. 2.2) Output Waveform - Simulation Result Copyright (C) Siam Bee Technologies 2015 10 The output voltage is regulated at 12.118V Time [sec] The output current is 4.039A (RL=3) V(Out) starts from 11V by the initial condition
  11. 11. 2.3) Output Power - Simulation Result Copyright (C) Siam Bee Technologies 2015 11 Time [sec] The simulation result shows the output power is 48.95W
  12. 12. 2.4) Gate Drive Output and Oscillator Timing (IC) - Simulation Result Copyright (C) Siam Bee Technologies 2015 12 Time [sec] PW = 3.282us VOSC Oscillator frequency = 105kHz
  13. 13. 3. 50W Off-Line Adapter Circuit (VIN=265Vac) - Simulation Circuit 13Copyright (C) Siam Bee Technologies 2015 .tran 0 50m 0 10n .Option Gmin=75E-9 .Option Abstol=1.0E-9 .Option Vntol=1.0u .Option Trtol=1000 .Option Method=Gear * Engine Solver: Alternate  Initial condition are set ,so the simulation starts near the steady state. VIN=265Vac V(Vcc) starts from 12V V(Out) starts from 11V by the initial condition
  14. 14. 3.1) Input Waveform - Simulation Result Copyright (C) Siam Bee Technologies 2015 14 Time [sec] VDC,AVG = 367.58V VAC = 265Vrms VDC, MIN = 361.264V
  15. 15. 3.2) Output Waveform - Simulation Result Copyright (C) Siam Bee Technologies 2015 15 The output voltage is regulated at 12.075V Time [sec] The output current is 4.025A (RL=3) V(Out) starts from 11V by the initial condition
  16. 16. 3.3) Output Power - Simulation Result Copyright (C) Siam Bee Technologies 2015 16 Time [sec] The simulation result shows the output power is 48.70W
  17. 17. 3.4) Gate Drive Output and Oscillator Timing (IC) - Simulation Result Copyright (C) Siam Bee Technologies 2015 17 Time [sec] PW = 1.706us VOSC Oscillator frequency = 105kHz
  18. 18. 4. Transformer Specification Copyright (C) Siam Bee Technologies 2015 18 NP NS NSUB Pin (S--F) Turns NP 1 → 3 54 NS 9 → 12 10 NSUB 5 → 6 10 Winding Specification Pin Value Inductance 1 - 3 600uH Leakage 1 - 3 15uH Electrical Specification  To model the transformer (or coupled inductors), we can use the SPICE primitive k, which describes the coupling ratio between a primary and a secondary.
  19. 19. 5. Operation Waveform (VIN=110Vac, Example) - Simulation Circuit 19Copyright (C) Siam Bee Technologies 2015 + VDS - ID - + VKA IF The system parameter are as follows: - Maximum output power : 50W - Input voltage : 110Vrms - AC line frequency : 50Hz - Switching frequency : 100kHz VIN=110Vac + VCC - V(Out) starts from 11V V(Vcc) starts from 12V
  20. 20. 5.1) Transformer Turn Ratio - Simulation Result Copyright (C) Siam Bee Technologies 2015 20 Time [sec] VP VS VCC  This figure shows the waveforms of the voltages at each side of the transformer.
  21. 21.  This figure shows the waveforms of ID(UQ101) and IF(D201, D202) in the CCM mode.  The primary-side inductance (LP) of the transformer determines the converter operation mode. 5.2) Transformer Primary Side Inductance (LP) - Simulation Result Copyright (C) Siam Bee Technologies 2015 21 Time [sec] ΟNΤ Τ IF(D201, D202) VPWM ID(UQ101)
  22. 22. 5.3) VCC Output Waveform - Simulation Result Copyright (C) Siam Bee Technologies 2015 22 Time [sec] VCC = 12.367V
  23. 23. 5.4) MOSFET Switching Device (UQ101) - Simulation Result Copyright (C) Siam Bee Technologies 2015 23 Time [sec] VDS(t) ID(t) Switching loss (turn-off) Switching loss (turn-on) Conduction loss (VDS x ID)
  24. 24. 5.5) Output Rectifier Diode (D201 - D202) - Simulation Result Copyright (C) Siam Bee Technologies 2015 24 Time [sec] VKA(t) IF(t) Peak magnitude current Conduction loss (VF,AK x IF) PLOSS_(D201, 202) (t)
  25. 25. 5.6) Current Sensing and Feedback Circuit - Simulation Result Copyright (C) Siam Bee Technologies 2015 25 Time [sec] 1V Comparator VCS
  26. 26. Conclusion Copyright (C) Siam Bee Technologies 2015 26 Input voltage Output power Oscillator frequency PW 85Vac 48.95 W 105 kHz 3.877 us 110Vac 48.95 W 105 kHz 3.278 us 265Vac 48.70 W 105 kHz 1.706 us Simulation Results
  27. 27. Simulation Details Analysis directives: .Tran 0 50m 0 10n .Option Gmin=75E-9 .Option Abstol=1.0E-9 .Option Vntol=1.0u .Option Trtol=1000 .Option Method=Gear * Engine Solver: Alternate Libraries: .LIB 2sk4101ls.lib .LIB an1431t.lib .LIB pc817c.lib .LIB d2sba60.lib .LIB mbrf20100ct.lib .LIB era91-02.lib .LIB 1n5408.lib .LIB fan7601.lib 27Copyright (C) Siam Bee Technologies 2015
  28. 28. Appendix A - Initial Condition Settings Copyright (C) Siam Bee Technologies 2015 28 Initial phase= 90 .IC V(Vdc_in)= {Vac*√2} .IC V(Vcc)= 12V .IC V(Out) = 11V .IC V(Cs)= 0V .IC V(Rt_Ct)= 0V .IC V(Ls)= 2V
  29. 29. Appendix B - Bill of Materials Copyright (C) Siam Bee Technologies 2015 29 Designator Manufacturer Part Number Comment Designator Manufacturer Part Number Comment R1 - 10Ω - C109 - 0.47uF - R103 - 56kΩ - C112 - 0.1uF - R105 - 100Ω - C201 - 1000uF - R107 - 0.5Ω - C202 - 1000uF - R108 - 1kΩ - C203 - 1nF - R109 - 8kΩ - C222 - 2.2nF - R110 - 3.9kΩ - D1 Fairchild 1N5408 Spice model R201 - 3.3kΩ - D101 Fairchild 1N5408 Spice model R202 - 1.2kΩ - D102 Fairchild 1N5408 Spice model R204 - 27kΩ - D103 Fuji Electric ERA91-02 Spice model R205 - 7kΩ - D201 ON Semi. MBRF20100CT Spice model R206 - 10Ω - D202 ON Semi. MBRF20100CT Spice model C1 - 1nF - U1 Shindengen D2SBA60 Spice model C103 - 150uF - U101 Fairchild FAN7601 Spice model C105 - 10pF - UQ101 Sanyo 2SK4101LS Spice model C106 - 2.7nF - U201 Panasonic AN1431T Spice model C107 - 47uF - U301 Sharp PC817C Spice model C108 - 0.01uF -
  30. 30. Simulation Index 30 Simulations Folder name 1. 50W Off-Line Adapter Circuit (VIN=85Vac)................ 2. 50W Off-Line Adapter Circuit (VIN=110Vac).............. 3. 50W Off-Line Adapter Circuit (VIN=85Vac)................ 4. Operation Waveform (VIN=110Vac, Example)........... ../Simulation data/VIN_85VAC ../Simulation data/VIN_110VAC ../Simulation data/VIN_265VAC ../Simulation data/Operation Waveform Copyright (C) Siam Bee Technologies 2015

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