Definition: Voltage-Commutated Chopper or Jones Chopper is a chopper circuit that commutates the thyristor by the application of a large reverse voltage across the thyristor. ... It is known to be an example of class D commutation of the thyristor.

What is load commutated chopper?

Load Commutated Chopper is a type of chopper which consists of four thyristors and one commutating capacitor. Figure below shows the circuit diagram of a load commutated chopper. Four thyristors are shown as T1-T4 and C is the commutating capacitor.

What is forced commutated chopper?

A forced commutation chopper control for regulating speed of a DC series tractive motor limits peak motor current by sensing the voltage across the commutation capacitor during the on-time of the current pulses and gating the commutation SCR on in response to a predetermined magnitude of sensed voltage to thereby ...