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I'm working on an experiment that generates a high frequency sinewave using an air core transformer.

How can I rectify and smoothen this high frequency sinewave because most of the high current rectifiers and electrolytic capacitors sold online are for low frequency signals?

The frequency range of the generator is between 5KHz to 20KHz.

Also what is frequency range of the common rectifiers and electrolytic capacitors?

Thanks.

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    \$\begingroup\$ How much current? How much capacitance? \$\endgroup\$
    – Justme
    Jan 17, 2022 at 14:10
  • \$\begingroup\$ Do you mean current of the generator? When upscaled, it will be around 50amps \$\endgroup\$
    – Daenny
    Jan 17, 2022 at 14:29
  • \$\begingroup\$ I forgot to ask, how much is the voltage? \$\endgroup\$
    – Justme
    Jan 17, 2022 at 15:03
  • \$\begingroup\$ Voltage is around 48V \$\endgroup\$
    – Daenny
    Jan 18, 2022 at 8:23

1 Answer 1

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How can I rectify and smoothen this high frequency sinewave because most of the high current rectifiers and electrolytic capacitors sold online are for low frequency signals?

Use fast diodes and capacitors that are rated for tens of kHz ripple current.

There are plenty to choose from. You might also consider Schottky diodes because they have zero reverse recovery time (as opposed to the ubiquitous 1N400x which can be as high as 30 μs from some suppliers).

There are plenty of electrolytic capacitors that have ripple current ratings for 100 kHz.

Also what is frequency range of the common rectifiers and electrolytic capacitors?

How long is a piece of string - you point out a capacitor and add a link to its data sheet and it will rapidly become apparent.

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  • \$\begingroup\$ Do be aware of the high reverse leakage of Schottky diodes, though. FREDs are an option if you need low leakage and high speed. \$\endgroup\$
    – Hearth
    Jan 17, 2022 at 14:21
  • \$\begingroup\$ Where can I get this fast diodes and capacitors? I mostly shop from AliExpress but I couldn't find it there. \$\endgroup\$
    – Daenny
    Jan 17, 2022 at 14:30
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    \$\begingroup\$ Farnell, Digikey, Mouser and RS and the common favourites for pros in the UK and most other places. I wouldn't buy components from (M)ali-express for a golden pig especially if it came from Shamazon. Pros buy from reputable sources for good reasons. \$\endgroup\$
    – Andy aka
    Jan 17, 2022 at 14:41
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    \$\begingroup\$ Aliexpress is just about the worst source you could get electronic components from. Seconding Andy's recommendations, with the addendum that Farnell goes by the name Newark in at least North America, and possibly other parts of the world too. \$\endgroup\$
    – Hearth
    Jan 17, 2022 at 14:48
  • \$\begingroup\$ Thanks. Do they ship their products outside the country? I am currently in Nigeria. I'm new to electronics but I'm really enthusiastic about it. \$\endgroup\$
    – Daenny
    Jan 18, 2022 at 8:27

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