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Looking for info about rectifiers designed using transistors

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Hi

I know that usually diodes or SCRs are used when designing rectifiers, but I'm looking for information on rectifiers designed using transistors.

Does anyone have such information or at least know where I would be able to locate the info?

Thanks
 

Re: Rectifiers

These are sometimes called commutating transistors. There is an auxiliary winding on the transformer to turn them on and off at the proper time. They were used before high current Schottky diodes became low in price.
 

Re: Rectifiers

That sounds like an interesting suggestion. But I did an online search and didn't find anything. Any help in the area of info location?

I have one other question, I'm a bit confused about something, I've never attempted to build/actually use a rectifier circuit before, I just used to seeing them in theory.

What I'm trying to do is create a rectifier in which the transistor switching is controlled by a DSP. Somewhat like the PWM switching of transistors in an inverter.

We're trying to convert ac-dc .....I know the typical diagram has transformer windings and then a load.
Will I be able to use the same circuit, since I'm using transistor switching?
 

Rectifiers

hi
it is possible to use a transistor as switch for rectifire
in fact SCR ,mosfets ..... works as an switch in rectifire circut.
but for turn on and off a transistor ,it cross active region ,therefor a lot of loss disspated and many Temp problem appear.
 

Re: Rectifiers

Transistors (Bipolar and FET) are used in synchronous rectifier circuits. They are turned on and off on the zero crossing of the AC waveform. The advantages is a much lower forward voltage drop than either a diode or an SCR. This results in greater efficiency. The down side, of course, is higher circuit complexity.
Regards,
Kral
 

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