![H bridge gate driver circuit](https://kumkoniak.com/92.jpg)
![h bridge gate driver circuit h bridge gate driver circuit](http://www.next.gr/uploads/38/2623-h-bridg-n.gif)
The following table summarizes operation, with S1-S4 corresponding to the diagram above. The other case, to let the motor 'free run' to a stop, as the motor is effectively disconnected from the circuit. In shorted case, the kinetic energy of a rotating motor consumed rapidly in form of electrical current in the shorted circuit. The H-bridge arrangement is generally used to reverse the polarity/direction of the motor, but can also be used to 'brake' the motor, where the motor comes to a sudden stop, as the motor's terminals are shorted. Apart from changing the rotation direction, the H-bridge can provide additional operation mode, "brake" and "free run until frictional stop". The "short"(see below in "DC motor driver" section) cases are dangerous to the power source and to the switches.Ĭhanging the polarity of the power supply to DC motor is used to change the direction of rotation. Note that, not all of the case of switching condition is safe. Two examples are discussed below, DC motor Driver and transformer of switching regulator. By proper arrangement of the switches, the polarity of the power to the device can be changed. H bridge is used to supply power to a two terminal device. This condition is known as shoot-through. The same applies to the switches S3 and S4.
![h bridge gate driver circuit h bridge gate driver circuit](http://patentimages.storage.googleapis.com/US6617913B1/US06617913-20030909-D00005.png)
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. By opening S1 and S4 switches and closing S2 and S3 switches, this voltage is reversed, allowing reverse operation of the motor. When the switches S1 and S4 (according to the first figure) are closed (and S2 and S3 are open) a positive voltage is applied across the motor. An H-bridge is built with four switches (solid-state or mechanical). The term H-bridge is derived from the typical graphical representation of such a circuit.
![h bridge gate driver circuit h bridge gate driver circuit](https://tablepoker.weebly.com/uploads/1/2/5/8/125871415/539748317.png)
H-bridges are available as integrated circuits, or can be built from discrete components. Structure of an H-bridge (highlighted in red)
![H bridge gate driver circuit](https://kumkoniak.com/92.jpg)