Simplified CMOS-MOSFET H-Bridge Circuit single input.
Fig. 1

Simplified CMOS-MOSFET H-Bridge Circuit


This a simplified version of Tri-State H-Bridge using CD4093B CMOS Circuit.

This H-bridge circuit uses a single CD4093B quad 2-input NAND gates integrated circuit. This is forward-reverse only.

DIR AOUT BOUT OUT MODE
HIGH 12V 0V FWD
LOW 0V 12V REV

The above truth table illustrates only two output modes.

Be sure to connect the H-bridge ground to Arduino, etc. ground. The "*" connection must go to Arduino, etc. +Vcc.

Simplified CMOS-MOSFET H-Bridge Circuit 2 inputs.
Fig. 2

The DIR connection can be broken into two separate connections. This is shown in Fig. 2.

Input A Input B AOUT BOUT OUT MODE
HIGH LOW 12V 12V STOP
HIGH HIGH 12V 0V FWD
LOW HIGH 0V 0V BRK
LOW LOW 0V 12V REV

The above truth table illustrates four output modes.

Be sure to connect the H-bridge ground to Arduino, etc. ground. The "*" connection must go to Arduino, etc. +Vcc.



CD4093B internal and pin connections.
Fig. 2

CD4093B Quad 2-Input NAND Schmitt Trigger is shown in Fig. 2. Voltage range 3-15-volts. While low power the current sink or source output is low. But this no problem driving MOSFET transistors.

The Schmitt trigger input assures better circuit performance in H-bridge circuits. There is better noise response.

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