Converter Classification

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Presentation transcript:

Converter Classification ECE 442 Power Electronics

First-Quadrant Converter Load Current iL flows into the load (+) Load Voltage is + Rectifier ECE 442 Power Electronics

Second-Quadrant Converter Load Voltage is + Load Current iL flows out of the load (-) Inverter ECE 442 Power Electronics

Second-Quadrant Converter ECE 442 Power Electronics

When the switch is closed E forces current through L, load voltage vL = 0 ECE 442 Power Electronics

When the switch is opened ECE 442 Power Electronics

ECE 442 Power Electronics

First and Second Quadrant Converter ECE 442 Power Electronics

S1 and D4 operate as a first-quadrant converter. S2 and D4D1 operate as a second-quadrant converter ECE 442 Power Electronics

Second Quadrant Operation 2 S2 closed S2 open ECE 442 Power Electronics

Third and Fourth Quadrant Converter The load voltage is always negative, but the load current is either positive or negative ECE 442 Power Electronics

Third Quadrant Operation S3 closed S3 open iL, vL are always negative ECE 442 Power Electronics

Fourth Quadrant Operation S2 closed load current +, load voltage – (zero) S2 open load current +, load voltage negative, (-Vs) ECE 442 Power Electronics

Four-Quadrant Converter Load Current can be positive or negative Load Voltage can be positive or negative For fourth quadrant operation, reverse E. ECE 442 Power Electronics

Summary of a four-quadrant converter ECE 442 Power Electronics

Summary of the conducting devices ECE 442 Power Electronics

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