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A Level     Power Switching     Capacitor Phase     Diac     >MOSFET<     Phase     Relay     Thyristor     Thyristor AC     Transistor     Triac    

Power Switching MOSFET


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MOSFETS can be used for switching but Triacs and Thyristors are preferred in very high power switching situations.

All the circuits include back-emf diodes to allow the current in the motors to die away slowly, preventing large back emf potentials.

On Off Switching

Commonly used for small to medium power situations.

MOSFET Switch Circuit


On Off and Reverse Switching H Bridge Circuit

Very common if the motor needs to be reversed or it's a stepper motor and the coil currents need to be reversed. Purpose designed chips are available to control this set-up.

The N and P Channel MOSFETS are connected as switches, not source followers.

H Bridge MOSFET Switch


Source Follower Switch

Rarely chosen. The top circuit is usually better.

MOSFET Source Follower Switch


 

 

 

 

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