dc-dc full bridge boost

cristix · 3rd July 2011, 06:26 PM

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 ,
Thanks

johansen · 8th July 2011, 02:58 AM

have you seen this?

http://www.ee.bgu.ac.il/~pedesign/Gr...s2009/ZCS_.pdf
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.

3rd July 2011, 06:26 PM	#1
cristix diyAudio Member Join Date: Jul 2011	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 , Thanks

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8th July 2011, 02:58 AM	#2
johansen diyAudio Member Join Date: Apr 2010 Location: seattle, wa	have you seen this? http://www.ee.bgu.ac.il/~pedesign/Gr...s2009/ZCS_.pdf 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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