The H-Bridge Circuit Control Design in DC Motor Application


In order to keep the speed of the motor constant when loads are applied, a control application circuit is needed to apply the purpose. The H-Bridge circuit may control the speed and direction of the motor. The below diagram shows H-Bridge with 4 inputs and external power supply, the control application must allow the motor to be operated in forward and reverse directions.

H Bridge Circuit

The
motor will rotate in one direction while if Q4 and Q2 are on (Q1 and Q3
are off) and vice versa. If, transistors (Q3 and Q2) and/or (Q4 and Q1)
are on the power supply becomes shorted to ground. The transistors are
protected from large reverse voltages and currents by the diodes
(D1-D4), while Resistors R1-R4 limit the currents into the bases of the Darlington configurations.

This H-Bridge circuit, clamp diodes, and digital logic interface circuitry are all built into the L293D. Further details on The H-Bridge Circuit Control Design in DC Motor Application can be seen in the following datasheet article of pdf filetype (source:  ece.unh.edu).


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