What is H Bridge ? Why its used in electronic systems ?

[danishdeshmuk]

What is H Bridge ? Why its used in electronic systems ?
Also what's the benefit of connecting H Bridge circuit across the inverter output ?


thanks

 

[ysba]

The H bridge is a circuit that can invert the load current's direction from a DC supply. The inverter circuit operation is based on the H bridge. A 'frequency inverter' is, by definition, a circuit that converts a DC bus in an AC bus, using a H bridge to do it.

 

[rahdirs]

• An 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.

• An H bridge is built with four switches (solid-state or mechanical).

• A common use of the H bridge is an inverter. The arrangement is sometimes known as a single-phase bridge inverter. The H bridge with a DC supply will generate a square wave voltage waveform across the load.

For a purely inductive load, the current waveform would be a triangle wave, with its peak depending on the inductance, switching frequency, and input voltage.