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AC to DC Converter Answered

Anyone know how to convert an AC to DC without using the Neutral Cable. Just a Single Live wire. Is there a way to split the incomeing Live wire to positive and negative phase and convert to DC from there? ANyone have any ideas?



    Sorry if i made it unclear. I am working on a home automation project controlled using Wireless RF. So the lighting switches that we used in the house hold is usually connected with a single live wire and the Neutral is normally connected to the other end at the lightings.

    Therefore, in order to power my IC chip, i need to convert the single wired AC incoming to DC at the switch side.

   Anyone got any idea?

Naw, you need a "return path" for the current. I suppose some sort of inductor might be able to draw power parasitically, but that would only work when the device (lamp, etc.) is turned on--and there would likely be an associated voltage drop.

According to wiki, most automated switches have batteries to power the ICs. Of the rest, think of "energy harvesting" as a "self-winding" watch...

From the wiki:

Battery-free switches

Most wireless light switches, such as the X10 solutions, rely on batteries for power output. Lightning Switch, EnOcean and Ad Hoc Electronics manufacture wireless light switches that use energy harvesting instead of batteries. The mechanical energy created by pressing the switch generates enough electricity to power a built-in transmitter that sends a radio signal to the receiver.

I browse thru the Lighting Automation homepages and saw that all their Automated Light Control Switches need to connect to Either the Live or Neutral only. But not both. So am wondering how they power up the DC component (IC chip, relays, RF receiver) using just 1 wire. No close loop to the system.

You could use a diode, but if you're thinking of doing something you would be better advised if we knew what it was.



8 years ago

Rectifier -- common as dirt in electric circuit.

For a complete power supply, filter capacitors are required to smooth out the rectified wave and to approximate DC. Precision power supplies are regulated.

Generally a transformer is required to drop or raise the line voltage as needed. Even if no voltage change is required, transformer is de regueur (for isolation.) While it's very easy to directly rectify AC mains, it's a very bad idea.