H-Bridge for your robot

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h-bridge schematics

H-Bridge is a must used for your robot to control the motors… the speed and the direction of each motor. There are many kinds of H-Bridge. For low current DC motor, you can use IC L293D or L298N to drive your motor.

H bridge is an electronic circuit that enables a voltage to be applied across a load in either direction. These circuits are often used in robotics and other applications to allow DC motors to run forwards and backwards. H bridges are available as integrated circuits, or can be built from discrete components.

The term H bridge is derived from the typical graphical representation of such a circuit. An H bridge is built with four switches (solid-state or mechanical). When the switches S1 and S4 (according to the first figure) are closed (and S2 and S3 are open) a positive voltage will be applied across the motor. By opening S1 and S4 switches and closing S2 and S3 switches, this voltage is reversed, allowing reverse operation of the motor.

Using the nomenclature above, the switches S1 and S2 should never be closed at the same time, as this would cause a short circuit on the input voltage source. The same applies to the switches S3 and S4. This condition is known as shoot-through.

Go to this page for complete explanation of H Bridge.

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6 thoughts on “H-Bridge for your robot

  1. Hi,I have some Questions here.
    Compare to L293 motor driver IC, which is the best?
    I found it difficult to control the PWM of my power window motor by using L293?
    Difficult in the way of i couldnt make it operate in a slow speed but only high speed.

    On the internet, i always see lots of projects using small DC motor with L293. Could you give me some opinion on how to operate pwm of my power window motor by L293??

  2. Actually there is a fest in my collage & in that there is a robotics war program,max weight is 25kg so plz help me how to makes robotics for war briefly with digram

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