Type - B Chopper | Second Quadrant DC - DC Converters | MATLAB Simulation
Type B Chopper
In type B or second quadrant chopper the load must always contain a dc source E . When the chopper is on, v0 is zero but the load voltage E drives the current through the inductor L and the chopper, L stores the energy during the time Ton of the chopper . When the chopper is off , v0 =( E+ L . di/dt ) will be more than the source voltage Vs . Because of this the diode D2 will be forward biased and begins conducting and hence the power starts flowing to the source. No matter the chopper is on or off the current I0 will be flowing out of the load and is treated negative . Since VO is positive and the current I0 is negative , the direction of power flow will be from load to source. 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.
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