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question 6 dc chopper l15 1 a draw the circuit...

Question: question 6 dc chopper l15 1 a draw the circuit...

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Question (6) DC Chopper l15 %1 a) Draw the circuit diagram of a 4-quadrant DC chopper controlled for a DC drive system Briefly explain its operation in all quadrants. Indicate which devices conduct during the operation in all quadrants. Derive expression for speed of the motor in terms of torque. b) A 220 V, 1500 rpm, 50 A separately excited motor with armature resistance of from a 4-quadrant H-bridge, de-to-de chopper. The supply voltage is 220V. The motor is driving a fan-type load torque and if running at 1500 rpm the motor drawing 50 A Determine duty cycle of the chopper for the following operating points: 1) Motoring operation at rated motor torque and 800 rpm 2) Braking operation at rated motor torque and 800 rpm 3) Motoring operation at rated motor torque and (-800) rpm 4) Braking operation at rated motor torque and (-800) rpm

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