H-BRIDGE DC MOTOR CONTROL

HELLO FRIENDS,

Let's know about H - bridge.

here is basic circuit of h-bridge.(image 1)

(image 1)

there are four switches use in h-bridge.

cause 1 :-

now if we turn on switch 1  and  4  then current will flow (see image 2) :-
 VCC-switch 1-load- switch 4-GND 

So here for load left side terminal is positive(+) and right side terminal is negative(-).



(image 2)


cause 2 :-

now if we turn on switch  2  and  3  then current will flow (see image 3) :-
 VCC-switch 2-load- switch 3-GND 

So here for load left side terminal is negative(-) and right side terminal is positive(+).
(image 3)


now consider, here load is motor and during cause 1 motor rotating clockwise direction,
than other cause(cause 2) motor will rotate anticlockwise direction.

Here as a switch we can use BJT, MOSFET, IGBT....


i use MOSFET as a switch. (see image 4)

what you need :-

  • IRFZ44N MOSFET - 4,
  • 100K resistors - 2, 
  • and motor
  • power supply
  • some jumper wires




(image 4)


Here diodes use for freewheeling. Motor is inductive load so freewheeling diode is necessary.
100K resistor is use as pull down resistor.

if you want to interface this circuit with Arduino or any microcontroller or Raspberry PI you just have to give signals to A and B. and don't forgot to connect ground of controller to this circuit ground.


you  can use this circuit in many projects like robotics or diy tools and many things.............







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