Electronic Manufacturing Design
ENB6071
Push-Pull Switch Mode Power
Supply, design & testing using
LabVIEW
By John Leek
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PBL Teaching Objective
• Component testing using Elvis II prototype
board – FGEN , Scope, Inductance meter
Impedance Analyzer
• LabVIEW for Final testing & plotting results
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Product specification
Input voltage 10 to 15 Volts D.C.
Output voltage 25 Volts D.C.
Output Power 30 Watts
SMPS configuration – Push-Pull
Switching frequency 100KHz
Minimum efficiency > 75% at > 5 Watts load
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• Switch mode power supply design
Component Testing as lab experiments
• Capacitors
• Transformer design and testing
• Fast switching diode
• Switching MOSFET
• Switching regulator IC (SG2526)
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Component selection - Capacitor Testing
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Diode Reverse recovery time
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Component selection – Switching Regulator
• Measurement of switching regulator SG2526
• Using manufactures test circuit
• Build on Elvis II prototype board and
Measurement of pulse width change with
control voltage
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Final Product testing
Automatic testing of power supply
• Measurement of input Volts & Current
• Measurement of output Volts & Current
• Plotting of converter efficiency from min load
to maximum load (30 Watts)
• Logging data to file for investigation of
converter losses
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Student Built Final Product
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Student Built Final Product
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Measure Output
Current
Measure input
Current
Power
Supply
Unit under
Test UUT
Measure
input Volts
Unit
Measure
output Volts
Active
load
Control
Load Current
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Final Product Testing
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Using NI cDAQ9174
Analog Input module NI-9215
Input Volts (10 to 15V) Current 0 to 3 Amps)
Output Volts & Current (25 V) Current 0 to
1.20 Amps
• Analog Output Module cDAQ NI-9263 –
Control of Active load
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Labview ATE testing
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• ATE system used to test
• Student build vero-board power supply
• Results saved to file and plotted using Matlab
– to investigate losses – constant and variable
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Many thanks for your time
Any Questions ?
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Demonstration
of ATE system
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