An H bridge is an electronic circuits 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 or backwards.
Most DC-to-AC converters (power inverters) most the DC-to-DC push pull converters, most motorcontrollers, and many other kinds of power electronics use H bridges. In particular, a bipolar stepper motor is almost invariably driven by a motor controller containing two H bridges.
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