Circuit - H-Bridge Electronic Circuits Designed by David A. Johnson, P.E.

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Circuits designed by David Johnson, P.E.
Last Updated on: Friday, March 23, 2012 06:53 AM

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H-Bridge Circuits

Alternating CW & CCW Motor Driver
A while back a company needed a motor controller for a custom door latching system. The system used a small brush motor with a speed reduction gear to both latch and unlatch the door. When pulsed for about 250ms in the clockwise direction, the motor would unlatch the door. When spun in the opposite direction for 250ms, it would latch the door. The circuit below performs this function. A single low power pushbutton is used to alternate between the two directions. The circuit is powered by 4.5v using a battery made from three alkaline AA cells. The motor draws about 250ma. The battery should provide many years of service.

Low Voltage H-bridge
TTL type Q and inverted Q inputs control a classic H-bridge circuit, rated at 50 volts and about 10 amps. The circuit can control power and direction of a DC motor. (added 7/06)

H-Bridge Circuits

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