Dr. Unnikrishnan P.C. Professor, EEE

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Presentation transcript:

Dr. Unnikrishnan P.C. Professor, EEE EE305 Power Electronics Dr. Unnikrishnan P.C. Professor, EEE

Buck-Boost Regulator The buck operation or the boost operation depends on the duty ratio of the chopper

Buck-Boost Regulator The output voltage is of reverse polarity For 0 <  < 0.5 , VO<VS ,the circuit functions as a Buck regulator For 0.5<  < 1 , VO>VS , the circuit functions as a Boost regulator The source is never connected directly to the load- indirect regulator The source current flows only when the switch is turned ON, hence the source current is discontinuous.

Buck-Boost Regulator Analysis

Buck-Boost Regulator Analysis

Buck-Boost Regulator Analysis Current Ripple

Buck-Boost Regulator Analysis

Buck-Boost Regulator Analysis

Buck-Boost Regulator Analysis

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