Question
Download Solution PDFLoad current is always negative in
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFA chopper is a static device that is used to obtain a variable dc voltage from a constant dc voltage source. Also known as a dc-to-dc converter.
Types of Choppers:
- 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 fourth-quadrant Chopper
The circuit diagram of Type B Chopper is as shown:
- When the chopper is ON, 'E' voltage drives a current through L in a direction opposite to that shown in the figure.
- During the ON period of the chopper, the inductance L stores energy.
- When Chopper is OFF, diode D conducts, and part of the energy stored in inductor L is returned to the supply.
- Therefore the average output voltage is positive and the average output current is negative as shown:
- In this chopper, power flows from load to source.
- Class B chopper is used for regenerative braking of dc motor.
- Class B chopper is a step-up chopper.
Last updated on May 30, 2025
-> The ISRO Technical Assistant recruitment 2025 notification has been released at the official website.
-> Candidates can apply for ISRO recruitment 2025 for Technical Assistant from June 4 to 18.
-> A total of 83 vacancies have been announced for the post of Technical Assistant.
-> The Selection process consists of a written test and a Skill test.
-> Candidates can also practice through ISRO Technical Assistant Electrical Test Series, ISRO Technical Assistant Electronics Test Series, and ISRO Technical Assistant Mechanical Test Series to improve their preparation and increase the chance of selection.