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DC chopper
This is one stage conversion device which is used for direct conversion of fixed de voltage at a level to an adjustable dc voltage at another level.
Figure DC Chopper
Chopper is high speed on/ off semiconductor switch is represented by a switch SW with an arrow as shown no current will flow if the switch is off and when it is on current will flow in the direction of arrow only.
why DC motors use field winding instead of armature winding
Constant Frequency System In this system chopping period T is kept constant but the on time T om is varied. This system is also referred to pulse with modulation or time
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what happens when we apply DC supply to transformer primary
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Mould Casting: Plaster Moulding : In this method, the mould is prepared in gypsum or plaster of paris. In practice, the plaster of paris is mixed with tale, asbestos, fibers
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