Class A Chopper / Type A Chopper : Working and Important Features:
Load voltage and Load current is always positive in this type of chopper
Power always flows from source to Load
The chopper/switch is implemented by thyristor.
It is also called as step down chopper as average output voltage is less than the input DC voltage.
Class A chopper is used to control the speed of DC motor drive
It is not capable of changing the direction of V0 or I0
Working
When CH is ON ⇛ FWD is OFF ⇛ V0 = VS
I0 flows from source to load and inductor stores energy
When CH is OFF ⇛ FWD is ON ⇛ V0 = 0
and I0 flows through FWD
Hence average value of V0 and I0 is always positive & power flows from source to load.
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