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Full Bridge rectifier using fast diodes

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Doctorandus_P:
This thread is also relevant:
https://www.eevblog.com/forum/projects/1kw-200400v-dcdc-converter-design-tip/

It also mentiones bridge rectum fires and has some nice fotage of a 50 year old power converter working at 30kHz.

glarsson:

--- Quote from: Doctorandus_P on January 30, 2019, 04:26:51 am ---Having a full bride rectum fire also leads to ...

--- End quote ---
Having a full what?

timenutgoblin:
hypothetically if the single diode was replaced with a full wave bridge rectifier then the input voltage could be either positive or negative and the output capacitor would still charge up. with the schematic in its existing configuration the diode will only conduct unless the input voltage is positive and not negative. yes it is possible to use a full wave bridge rectifier in this circuit but it would be impractical and inefficient.

Kleinstein:
With a full wave rectifier the DCDC converter would be a combination of a forward converter and flyback. It may make sense, but could also cause trouble. At best the other polarity does not conduct at low load and at high load (or at start up), when the output voltage drops the other half wave kicks in as a forward converter to deliver extra power - but without much regulation.

At 300 V the extra drop from a second diode would not be so bad for efficiency.

Doctorandus_P:

--- Quote from: glarsson on January 30, 2019, 09:03:32 am ---
--- Quote from: Doctorandus_P on January 30, 2019, 04:26:51 am ---Having a full bride rectum fire also leads to ...

--- End quote ---
Having a full what?

--- End quote ---
The fun starts at 2:50

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