The Cockcroft–Walton generator, or multiplier, is an electric circuit that generates a high DC voltage from a low-voltage AC or pulsing DC input.
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This project was sponsored by NextPCB
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Multipliers are typically used to develop higher voltages for relatively low-current applications such as laser systems, X-ray systems, air ionisers, cathode ray tubes etc...
The video above shows such a device capable of generating a high voltage of 100,000 volts and more. We can divide the whole device into several parts:
- DC voltage source consisting of mains transformer and rectifier, in this case with output voltage of 15V and current of 5A.
- AC high voltage source, with an output value of 5 to 10 thousand volts. This assembly consists of a driver circuit and a flyback transformer from an old TV. In my case it is a "Plasma Speaker" device I have made before. Here you can create a simpler driver for example with 555 IC, for which is also given the link to the schematic below.
Let me emphasize here that it is necessary to use an output transformer that gives AC voltage, and not a transfocascade whose output we have DC voltage ,that is not suitable for this device.
- Lastly, this is the Cockroft-Walton voltage multiplier which is made up of cascading high voltage diodes and capacitors. They are designed for voltages of 20 thousand volts or more. The plate on which they are mounted should be made of highly insulating material to avoid sparking with the substrate. For the same reasons, a piece of glass or pertinax is placed under the plate.
And a very important note:
Never touch the opened device when it is energised. Also wait a while after switching off to allow the capacitors time to discharge. You must adhere to all safety rules.
Schematics:
[ Ссылка ] (HV Source)
[ Ссылка ] (HV source 555)
[ Ссылка ] (Multiplayer)
If you are interested in this area, look at the Playlist with all my High Voltage projects at:
[ Ссылка ]
Visit my Youtube Channel for more Projects , DIY and How To Make videos:
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by mircemk
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