Type A Chopper or First–Quadrant Chopper-Power electronics
In this video we explained Type-A Classification of chopper based of quadrants
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This type of chopper is shown in the figure. It is known as first-quadrant chopper or type A chopper. When the chopper is on, v0 = VS as a result and the current flows in the direction of the load. But when the chopper is off v0 is zero but I0 continues to flow in the same direction through the freewheeling diode FD, thus average value of voltage and current say V0 and I0 will be always positive as shown in the graph.
In type A chopper the power flow will be always from source to the load. As the average voltage V0 is less than the dc input voltage Vs