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7.5W QUASI RESONANT
CONVERTER
ZERO CURRENT SWITCHING
BUCK CONVERTER
BHARADWAJ S
RAHUL G N
PREMCHAND
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SPECIFICATIONSInput : 10V to 15V
Output : 9V, 1.5A, 7.5W
Buck Converter
Controller 555 Timer
Frequency 100 to 67KHz
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BLOCK DIAGRAM
POWER CIRCUIT
CONTROL
(Switch)
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BASIC OPERATIONAL CIRCUIT
Quasi Resonant Converter PWM Converter
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OPERATION
When Switch is closed
When Switch isopen
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CONTROL CIRCUIT
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POWER CIRCUIT
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CIRCUIT DIAGRAM
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ON and OFF times in 555 Timer.Ton = 0.693(R1 + R2)C1
Toff = 0.693(R2)C1
For Zero Current Switching
Io = Vin (Cr/Lr)
Resonant Frequency = 1/(2 LrCr)
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EAGLE SCHEMATIC
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PCB LAYOUT
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ADVANTAGES Small in size.
Less sensitive to temperature.
Highly efficient.
Controllable outputs.
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APPLICATIONSSwitching Mode Power Supplies
LED Lighting Systems
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