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Industrial Electronics & Control, , Electrical Engineering Semester IV, , (Unit 3)-Choppers, MEENAKSHI RASTOGI, , Lecturer- Electrical Engineering, , Government Polytechnic Lucknow

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Content, , Choppers, , Types and Classification of Choppers, , Application of Choppers, , Step-down Choppers with R load, , Step-down Chopper- Principle of Operation, Step-up Chopper- Principle of Operation, , Type A Chopper or First-Quadrant Chopper, , * Type B Chopper or Second-Quadrant Chopper, , * Type -C chopper or Two-quadrant type-A Chopper, ¢ Type D Chopper or Two-Quadrant Type —B Chopper, ¢ Type —E chopper or the Fourth-Quadrant Chopper

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Chopper (DC-DC Converter), , A chopper is a static device that converts fixed DC input voltage to, variable output voltage directly., , Choppers t————_, L, , ®ve © o} oc, y |S, , Fixed or Variable DC, Variable DC

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Types and Classification of Choppers, , ° Types of Choppers, , 1. Step-down Choppers (buck converter), , 2. Step-up Choppers (boost converter), , * Classification of choppers, Type A Chopper or First-Quadrant Chopper, Type B Chopper or Second-Quadrant Chopper, , 1., , 2., , 3. Type -C chopper or Two-quadrant type-A Chopper, 4. Type D Chopper or Two-Quadrant Type —B Chopper, Bs, , Type —E chopper or the Fourth-Quadrant Chopper

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Application, , * trolley cars, , ¢ Battery operated vehicles, , * Traction motor control, , * Control of large number of DC motors, * Regenerative braking of DC motors, , * DC voltage regulators, , ¢ Solar Systems, , ¢ Wind systems