![]() 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. 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-bridges are available as integrated circuits, or can be built from discrete components. Schematic of an H-bridge (highlighted in red)
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