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bd40bc7c7a .. This is also called step down chopper as average value of VO is less than the input voltage. When the chopper CH4 is turned on positive current starts to flow through CH4, D2 ,E and the inductor L will store energy. The load voltage V0 = (E+L .di/dt ) will be more than the voltage Vs so the type B chopper is also known as a step up chopper . The average output voltage is directly proportional to the ON time of chopper. In the second quadrant, the chopper and D2 will operate together as type B chopper. As soon as the chopper CH1 is turned off, the positive current freewheels through CH4 and the diode D2 . Enz, G. Hence chopper operation is restricted in third quadrant of VO-IO plane.