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Old 3rd July 2011, 06:26 PM   #1
cristix is offline cristix  Italy
diyAudio Member
Join Date: Jul 2011
Smile dc-dc full bridge boost

Hi ,

I want to do an boost full bridge converter
25-40Vdc input ... 400Vdc output 300W

I start with UC3825 but i have some problems .
A friend suggest me to use UC3875.

Someone may give me more information , or similar application to do this converter ?

Cristix ,
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Old 8th July 2011, 02:58 AM   #2
johansen is offline johansen  United States
diyAudio Member
Join Date: Apr 2010
Location: seattle, wa
have you seen this?

The resonant switching methods look rather complicated to say the least, but are you looking to capture the switching losses? If not have you thought about rolling your own z source inverter? The stress on the h bridge switches is much lower than a current-fed h-bridge and the transformer leakage inductance is no longer critical. Regulation is achieved by simply varying the switch shoot-through or overlap. If you set the turns ratio so that you always must have some shoot through even at 25 volts then the control mechanism becomes that of a simple boost regulator.
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