Question

Which chopper circuit operates in all the 4 quadrants?

Answer 1

A chopper circuit for four quadrant operation is shown fig 3.88 (a) this is obtained by connecting two quadrant chopper antiparallel to each other. the circuit has characteristics similar to a dual converter the load side voltage and current waveform have both polarities . the dc machine connected to this chopper can be Accelerate braked and controlled so as to have smooth speed variation in both directions of relation this four quadrant chopper is a starting point for the development of a force commutated inverter to obtain a variable frequency voltage at the load terminal form a constant dc supply the sketch of the output voltage of the circuit operations as an inverter fig 3.88 ( b).......

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