H-Bridge Electronic Circuits

H-Bridge Circuits
H-Bridge: # - C D - F H G - Z
Last Updated on: Monday, October 03, 2011 06:07 PM

Circuits Designed by Dave Johnson, P.E. :

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)

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

"H" Bridge Direct Current Motor Control Circuit (LM311) - This page features H-Bridge circuits used for controlling direct current motors. Several designs are shown using both CMOS and Bi-Polar power devices….scroll to view all of the circuits…. [from Rob Paisley's Model Train web site]

3Amp - DCC Booster Circuit #1 (LMD 18200) - The first schematic is for a basic 3 Amp - DCC Booster using the LMD 18200 CMOS, H-Bridge. Included in the design is a 5Volt regulator that supplies power to the DCC signal generation and display circuitry…. This page features H-Bridge circuits used for controlling direct current motors - scroll to find this one…. [from Rob Paisley's Model Train web site]

4-transistor H-bridge - an interesting 4-transistor H-bridge variant; this is cheap and easy to build, and best of all is "smokeless" (i.e., no combination of inputs can cause bridge to self-destruct). (added 7/06)

6-transistor H-bridge - This is six transistor "Tilden style" H-bridge; while not as old as original "basic H-bridge," this goes "way back," and is basis for many BEAM driver circuits (added 7/06)

A better MOSFET H Bridge Schematic - (schematic / circuit added 6/07)

A DMOS 3A, 55V, H-Bridge - National Semiconductor Application Note (app note added 7/06)

A H-Bridge Design - With a Protection against Having Two Positive Input Pulses.....(Circuit design added 12/08)

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. [Designed by David A. Johnson]

AN16 Automotive & Household Siren Driver Circuits: ZSD100 & Discrete 'H'-Bridge Minimum Parts Count Solution - Zetec Semiconductors Applications Notes A solution is provided that uses a minimum number of components by utilising an application specific signal generation IC, and a high efficiency 'H'-bridge effected with 3A DC rated Super-δ TO92 style switching transistors. (app note added 2/06)

AN-694: A DMOS 3A, 55V, H-Bridge: The LMD18200 - National Semiconductor Application Note (app note added 2/06)

Better MOSFET H Bridge - (schematic / circuit added 6/07)

Comparator Controlled H-Bridge Circuits (LM311) - Circut three and four are simple Bi-Polar H-Bridge circuits. The bridges are controlled by a pair of LM311 voltage Comparators. The LM311 Voltage Comparator has several unique features, one of which is an output transistor with an open emitter as well as the typical open collector. This allows the output transistor of the comparator to sit between the bases of the power transistors. The LM311 Voltage Comparator also has a STROBE input that will turn off the output regardless of input conditions. The circuit is shown in two configurations. The first is a typical two input bridge. The second circuit has a single - duplex input that would be used for model railroad "DCC" control applicationsThis page has several circuits.....please scroll down to these..... [from Rob Paisley's Model Train web site]

H-Bridge: # - C D - F H G - Z