Take the 2-minute tour ×
Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It's 100% free, no registration required.

enter image description here

Because of the topology of tri-phase bridge rectifier, every phase is active (i.e.; feeding the load) only for 33% of the time. It feels like we are not fully utilizing all the three phases, and because of that the output impedance of the rectifier is higher than it could actually be.

Is there an alternative rectifier form which utilizes all three phases (or all N-phases in general). For example, by pumping charge in a storage element in a sub-interval of one period, and using it in another sub-interval.

Assmue that the load is always resistive.

enter image description here

share|improve this question
add comment

1 Answer 1

The energy efficiency of a three phase rectifier is pretty high in my book but if you're only wanting to push energy into a resistive load then make yourself a star-connected load of resistors. This will be perfect - no losses in diodes at all.

If, on the other hand you are requiring a DC output then consider what high power switch mode power supplies do - nowadays they have to correct for surges and non-ideal power factors by trying to utilize energy from the input waveform all the way along and as such they "strive" to present a near resistive load to the incoming AC.

share|improve this answer
2  
This is called "Power Factor Correction" (PFC) and there are three-phase as well as single-phase designs. –  Dave Tweed Sep 24 '13 at 18:39
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.