rectifier using mosfet

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nocky

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hello

I am designing a power supply for powerline robots, i'm using qfield to design a current transformer. I'm getting a low ac voltage 1V and i need to rectifier it, i have read that i can use mosfet for rectification...I'm not sure hhow to go about designing it... anyone who can help or pdfs to read thru...plz.

thank u
Nocky
 

As a first point, I don't exactly understand the motivation of your question. The output of a current transformer is basically a current rather than a voltage. Of course, the available voltage is limited according to the maximum core flux.

Secondly, I fear you'll get difficulties to operate a self-steered MOSFET rectifier with low voltages of e.g. 1 V, because MOSFET threshold voltages are usually higher.

In my view, there are two common solutions for rectifying current transformer output:
- if an output voltage of e.g. 1 V can be accepted, use low voltage schottky diodes
- for lowest transformer voltage (respectively best accuracy), use active rectifier circuits with operational amplifiers or optionally preceeding AC amplification
 
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