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It's not well known, but there is a circuit called a Jones Chopper that uses two SCRs in a DC PWM type circuit. It was originally described in the old GE SCR Manual. It requires an autotransformer and capacitor as part of the circuit. The autotransformer charges the capacitor which is discharged by the second SCR to momentarily reverse bias the first SCR and turn it off. The complexity of this design has limited its application, but it is an interesting circuit.Thyristors need to drop to 0A to turn off so you can not use them to control a DC motor from a DC rail.
It's not well known, but there is a circuit called a Jones Chopper that uses two SCRs in a DC PWM type circuit. It was originally described in the old GE SCR Manual. It requires an autotransformer and capacitor as part of the circuit. The autotransformer charges the capacitor which is discharged by the second SCR to momentarily reverse bias the first SCR and turn it off. The complexity of this design has limited its application, but it is an interesting circuit.
No argument with that.better off with just a FET or an IGBT
there is not normally a field winding on a DC motorthanks. what about for field and armature control and btw do you have workable circuits.