bee technologies design kit flyback converter using pwm ic ltspice version 1copyright (c) siam bee...
TRANSCRIPT
Bee Technologieshttp://www.bee-tech.info/
Design KitFlyback Converter using PWM IC
LTspice Version
1Copyright (C) Siam Bee Technologies 2015
02JUL2015
Contents
1. 50W Off-Line Adapter Circuit (VIN=85Vac)1.1) Input Waveform1.2) Output Waveform1.3) Output Power
1.4) Gate Drive Output and Oscillator Timing (IC)2. 50W Off-Line Adapter Circuit (VIN=110Vac)
2.1) Input Waveform2.2) Output Waveform2.3) Output Power
2.4) Gate Drive Output and Oscillator Timing (IC)3. 50W Off-Line Adapter Circuit (VIN=265Vac)
3.1) Input Waveform3.2) Output Waveform3.3) Output Power
3.4) Gate Drive Output and Oscillator Timing (IC)4. Transformer Specification5. Operation Waveform (VIN=110Vac, Example)
5.1) Transformer Turn Ratio5.2) Transformer Primary Side Inductance (LP)
5.3) VCC Output Waveform5.4) MOSFET Switching Device (UQ101)5.5) Output Rectifier Diode (D201 - D202)
5.6) Current Sensing and Feedback Circuit
ConclusionSimulation DetailsAppendix A - Initial Condition SettingsAppendix B - Bill of MaterialsSimulation Index
2Copyright (C) Siam Bee Technologies 2015
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=85VacV(Out) starts from 11V by the initial condition
V(Vcc) starts from 12V
1.1) Input Waveform- Simulation Result
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Time [sec]
VDC,AVG = 104.33V
VAC = 85VrmsVDC, MIN = 85.8V
1.2) Output Waveform- Simulation Result
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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
1.3) Output Power- Simulation Result
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Time [sec]
The simulation result shows the output power is 48.90W
1.4) Gate Drive Output and Oscillator Timing (IC) - Simulation Result
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Time [sec]
VOSC
Oscillator frequency = 105kHz
PW = 3.877us
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
2.1) Input Waveform- Simulation Result
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Time [sec]
VDC,AVG = 142.41V
VAC = 110Vrms
VDC, MIN = 128.621V
2.2) Output Waveform- Simulation Result
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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
2.3) Output Power- Simulation Result
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Time [sec]
The simulation result shows the output power is 48.95W
2.4) Gate Drive Output and Oscillator Timing (IC) - Simulation Result
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Time [sec]
PW = 3.282us
VOSC
Oscillator frequency = 105kHz
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
3.1) Input Waveform- Simulation Result
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Time [sec]
VDC,AVG = 367.58V
VAC = 265Vrms
VDC, MIN = 361.264V
3.2) Output Waveform- Simulation Result
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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
3.3) Output Power- Simulation Result
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Time [sec]
The simulation result shows the output power is 48.70W
3.4) Gate Drive Output and Oscillator Timing (IC) - Simulation Result
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Time [sec]
PW = 1.706us
VOSC
Oscillator frequency = 105kHz
4. Transformer Specification
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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.
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
5.1) Transformer Turn Ratio- Simulation Result
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Time [sec]
VP
VS
VCC
This figure shows the waveforms of the voltages at each side of the transformer.
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
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Time [sec]
ΟNΤ
Τ
IF(D201, D202)
VPWM
ID(UQ101)
5.3) VCC Output Waveform
- Simulation Result
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Time [sec]
VCC = 12.367V
5.4) MOSFET Switching Device (UQ101)- Simulation Result
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Time [sec]
VDS(t)
ID(t)
Switching loss (turn-off)
Switching loss (turn-on)
Conduction loss (VDS x ID)
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)
5.6) Current Sensing and Feedback Circuit- Simulation Result
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Time [sec]
1V Comparator
VCS
Conclusion
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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
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
Appendix A- Initial Condition Settings
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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
Appendix B- Bill of Materials
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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 -
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