C
Charles Jean
- Jan 1, 1970
- 0
This just occurred to me, and it's probably a stupid question, but
I've got to ask:
I've seen lots of circuits for DC motor speed control using the PWM
principle and a MOS FET to control the DC current through a motor.
The gate of the FET is modulated by a square wave of variable duty
cycle. All of the diagrams I have seen about the construction of a
MOS FET seem to indicate a device that is symmetric on the source and
drain ends about the gate electrode. If that is really the case,
could one switch source and drain connection ends in a such a circuit
and still have the same operational characteristics?
If so, could the same arrangement be used to control an AC current
through a load?
I've got to ask:
I've seen lots of circuits for DC motor speed control using the PWM
principle and a MOS FET to control the DC current through a motor.
The gate of the FET is modulated by a square wave of variable duty
cycle. All of the diagrams I have seen about the construction of a
MOS FET seem to indicate a device that is symmetric on the source and
drain ends about the gate electrode. If that is really the case,
could one switch source and drain connection ends in a such a circuit
and still have the same operational characteristics?
If so, could the same arrangement be used to control an AC current
through a load?