### Author Topic: difference between full bridge, half bridge, and H-bridge  (Read 38878 times)

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#### Admin

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##### difference between full bridge, half bridge, and H-bridge
« on: June 08, 2005, 01:29:30 PM »
Can someone explain the difference between full bridge, half bridge, and H-bridge? I understand H-bridge really well . . . anyone have any schemactics of the others?

#### Afroman

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##### Re: difference between full bridge, half bridge, and H-bridge
« Reply #1 on: June 11, 2005, 01:36:04 PM »
As far as I know, a full bridge and a half bridge are the same thing.
A half bridge is sometimes also called a totem pole driver
http://www.4qd.co.uk/fea/half.html
I am not really sure how to explain it simply, but a full bridge is just generally better for driving heavy inductive loads.

#### Kohanbash

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##### Re: difference between full bridge, half bridge, and H-bridge
« Reply #2 on: October 14, 2007, 07:33:06 PM »
Hi
Usually Full and half bridges refer to rectifying AC to DC. A half bridge has one diode so that the only the positive  (or bottom) part of the sine wave get through.
A full wave uses 4 diodes but instead of just clipping off half the wave it reverses the polarity of half the wave, thereby increasing the efficiency and doubling the frequency.

After the bridge you would usually put a filter and a shunt cap to smooth the wave into DC and to remove any ripples.

An H bridge uses switches/transistors to alter the flow of current so as to reverse the polarity applied to the motor.
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