Based on the commutation process they are classified as a natural commutated. In this video i have to explained chopper introduction in hindi. Voltage impulse commutated chopper both constant frequency and variable frequency operations. In stepdown choppers, the output voltage will be less than the input voltage. Schematic of an inverter using a vibrator as a chopper. The main classification of the chopper is dc chopper and ac link chopper.
Rc is so large such that it can be treated as open circuit during the commutation interval. In this am considering the current commutated chopper. Pdf ee6503 power electronics pe books, lecture notes. When thyristor is on, supply voltage appears across the load and. Consequences of the commutating methods on device stresses. The principle of operation of chopper can be understood from the circuit diagram below. Here you can download the free lecture notes of power electronics notes pdf pe pdf notes materials with multiple file links to download. Commutation circuit has to supply 5a current in opposite direction to the. Power electronics interview questions and answers pdf free download mcqs objective type questions lab viva manual gate cat preparation syllabus online quiz. Types of chopper circuits type a, type b, type c, type d. Impulse commutated choppers are widely used in high power circuits where load.
Current commutated chopper power electronics electrical. If these semiconductor devices are arranged appropriately, a chopper can work in any of the four quadrants. The input dc voltage can be increased stepup or decreased stepdown in output side so a dc chopper circuit can be considered as dc equivalent to an transformer. Here thyristor is turned off by a current pulse that is why it is called a current commutated chopper. In electronics, a chopper circuit is used to refer to numerous types of electronic switching.
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