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Old 14th June 2011, 02:48 PM   #1
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Default Half bridge Vs full bridge smps supplies

hey.. I'm new with Smps designs.. dc-dc converters and i want to know which of the smps is better half bridged or full bridged and whats the difference between the two...?
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Old 15th June 2011, 09:16 AM   #2
hesener is offline hesener  Germany
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thats a big question, especially if you are new to SMPS..... my recommendation would be to read first.... generally speaking, full bridge is for very high power, and half bridge for power levels from say 100W to 600W, below would be flyback.
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Old 15th June 2011, 01:09 PM   #3
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Thank you!! actually that's what i tried to do first... to read.....but as the time passed i got confused with what to read first and now im so mess up... so now the problem is where to start reading... whole of my interest came out from designing smps for car amplifier.. and i want to design efficient one and that's where my question came from..!!!
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Old 15th June 2011, 01:12 PM   #4
hesener is offline hesener  Germany
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Hi,

try Switched-mode power supply - Wikipedia, the free encyclopedia

this should give you a first understanding of the different topologies and their pros and cons.

the "references" section has a lot of literature, with the first one being a good one (from Christophe Basso).

hope that helps
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Old 26th July 2011, 02:07 PM   #5
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I really do not understand why everybody are saying that full bridge are for high power.
Let put it this way, full bridge is a little more complicated and a little more expensive, but is certainly give you more watts/cubic inch. Why? because for the same output power, the half-bridge needs twice the amount of copper in secondary winding. For a lot of applications, you have to use a larger ferrite core just because of that. Half -bridge = half voltage in primary winding => twice the windings for secondary than full bridge for the same output voltage&current. Full bridge is more efficient in using magnetics
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Old 27th July 2011, 05:12 AM   #6
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eh, you only need 1.41 times as much copper for the same watts lost in the secondary over a full bridge rectifier output. but the diode losses are doubled with full bridge. depending on what efficiency you're trying to hit and the secondary voltage a center tapped secondary with 50% more copper is better.

If you're driving the transformer with a capacitor in series then the full bridge lets you use a cap that's rated to say 5% of the dc bus. for example, I actually used some 6.3vdc 1200uF caps back to back in a 2 kw full bridge inverter recently. The duty cycle is locked at 50% so the caps only have a couple volts on them, there is no need for using quite a few cubic inches of film caps.

On the primary side it don't matter half bridge or full bridge. You might be thinking of push-pull, which is analogous to the center tapped, two diode rectified secondary. For the push-pull you'll need 41% more copper on the primary side as well.

Half bridge is often the choice because you only need one 2$ gate driver instead of two. realistically its exactly the same.
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