Computer.. engineering

Chopper are used for speed control and braking. The systems employing chopper offer smooth control, high efficiency and have fast response The average load current Where T-chopping period Duty cycle of chopper f-chopping frequency The rms value of output voltage is Jav, -- [re ar, If we consider the converter to be lossless then the input power is equal to the output power and is given by PE (at) TR The effective inputste wen I the Pub The durante a can be varied by vary. Tellregunty Constant frequency operation: 1)The chopping period T is kept constant and on time varied. The pulse width modulation the width of the pulse is varied. 2) Variable frequency operation, the chopping frequency is varied. Frequency modulation, either on time or of time is kept constant HIV LL During on T I.stores energy When switch off U V exceeds source voltage s V Diode D is forward biased power is fed back to supply. As Vis more than sourse voltage. So such chopper is called step up chopper So current is always negative and V, is always positive. 3.4 TWO QUADRANT TYPE A CHOPPER OR. TYPE C CHOPPER: Torre de Both the switches never switch ON