Exp. 3 intro, and flyback converter design

Exp. 3 intro, and flyback converter design
Exp. 3: A three-part experiment: 5 weeks
Exp. 3 Part 1: 3 weeks
Demonstrate dc-dc
converter power stage
operating open loop,
driven by MSP430 PWM
output
Inside, with input power
supply and resistive load
Outside, between PV panel
and battery
DC system simulation
Exp. 3 Parts 2 and 3: 2 weeks
Demonstrate working sensor circuitry, interfaced to microprocessor
Demonstrate peak power tracker and battery charge controller algorithms,
outside with converter connected between PV panel and battery
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Exp. 3,
Part 1
Tasks
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1.1 design and construct the inductor
1.2-1.4 demonstrate dc-dc power stage on the bench
1.5 demonstrate dc-dc power stage with PV panel outside
1.6 simulation and interpretation of data [D2L module and quiz will be posted]
2
Layout issues
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Gate drive circuit
with transformer isolation
• Gate driver output vd(t) has a dc component
when d ≠ 0.5
• Transformer will saturate if we apply dc
• Primary blocking capacitor removes dc
component
• Secondary capacitor and diodes form a
diode clamp circuit that restores the dc
component
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Gate driver transformer
• Use ferrite toroid in your kit
• Leakage inductance is minimized if bifilar
winding is used
• Need enough turns so that applied voltseconds do not saturate core:
∆B = V1DTs /n1Ac
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Alternate smaller version of gate driver
• Uses only one gate driver instead of two, to
produce half the voltage swing on primary
• Transformer turns ratio is 1:1
• Produces half as much gate current
• Suitable for smaller MOSFETs
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Discussion of construction and layout techniques
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