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Two Quadrant Type A Chopper or Class C Chopper or Reversible Chopper
The quadrant type A Chopper is also known as reversible chopper because the polarity of the load current can be reversed.
Mode I
When SW1 is ON V0= Vs and the direction of current is shown as figure therefore current I0 and voltage Vo will be positive.
When SW1 of OFF V0 =0 but now load inductor releases the energy and current is maintained in the same direction. In this case V0= 0 because the polarity of inductance will be reversed and VL = -E therefore.
V0 = VL + E = -E + E =0
Hence the Vo - Io characteristic is drawn in first quadrant since both V0 = I0 are positive as shown in figure.
Mode II
When SW2 is on Vo + 0 but current will be flowing from load t oSW2 in negative direction. Inductance stores energy due to E2.
When SW2 is off Vo = E +L di / dt exceeds Vs and therefore diode D is forward biased and current flows from load to source through diode D.
Hence the Vo -I0 characteristics for mode II is drawn in second quadrant since Vo is positive but I0 is negative as shown in figure.
Step Up Chopper In this chopper average output voltage is greater than input voltage. The circuit different mode of operation and current waveforms are show. When
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