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Download DC – DC CONVERTER (DC ‐ CHOPPER
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Transcript
By Mr. K .Anish Block diagram of DC-DC CONVERTER DC – DC CONVERTER (DC ‐ CHOPPER • A chopper is a static device which is used to obtain a variable dc voltage from a constant dc voltage source. • chopper is also known as dc‐to‐dc converter. • The thyristor converter offers greater efficiency, faster response, lower maintenance, smaller size and smooth control. • Choppers are widely used in trolley cars,battery operated vehicles, traction motor control,control of large number of dc motors, etc….. • They are also used in regenerative braking of dc motors to return energy back to supply and also as dc voltage regulators. Choppers are of two types: • Step‐down choppers • Step‐up choppers PRINCIPLE OF STEP‐DOWN CHOPPER • Figure 2.1 shows a step‐down chopper with resistive load. • The thyristor in the circuit acts as a switch. When thyristor is ON, • supply voltage appears across the load and when thyristor is OFF, • the voltage across the load will be zero. The output voltage and • current waveforms are as shown in figure 2.2. Step-down choppers — output voltage and current waveforms Anish@PITS
