Vector 750 Watt Power Inverter User Manual download pdf (Page 12)

The Hivolt/HiTek Power transformers are definitely

overkill for any use I have - anyone wanting to replicate

this could use a less massive ferrite core.

Driven by the 400 watt inverter, the output of this

transformer provides a very hot arc. The open circuit

voltage should be in the vicinity of 3500 volts but I did

not attempt to measure it. In continuous operation the

power supply did not seem to be taxed and the fuse

stayed intact. For more power & voltage I believe I

could safely remove a few primary windings.

To try out this supply, I connected it directly to the

internal electrodes of my small oxygen plasma etcher. I

have had some success using electronic neon sign

transformers (basically the same thing as this, just much

lower current output). The result was a very intense

plasma. I also tried capacitively coupling the supply to

the plasma and that also worked reasonably well.

V. NEXT STEPS

With regard to the Cockcroft-Walton multiplier the next

logical step would be to replace the AMP transformers

with ferrite core transformers wound in the correct ratio

to properly drive the cascade using the 180 volt high

frequency output of an inverter. This would provide

quite stunning performance.

With regard to the plasma reactor high frequency

supply. I plan to investigate the use of a larger inverter

(maybe 1000 watts) and also try some experiments with

increasing the frequency beyond 50 kHz.

VI. ROLLING YOUR OWN

While I have to consider myself fortunate to have

acquired (at an excellent price) the surplus Hivolt

multipliers and related components, much of what is

presented in this article can be accomplished with

discrete components, readily available ferrite core stock,

etc. The great find for me was discovering the ease of

modification and utility of inexpensive power inverters.

For those who might be on the lookout for the

cascade multipliers, ESS does maintain an eBay store

(esssurplus) and the Hivolt products do show up from

time to time.

the Bell Jar, Vol. 10, No. 3/4, Summer/Fall 2001

Inverter

(50 kHz)

12V

High Voltage/

High Frequency

Output

180 volts

step up

Front end of Vector

Inverter

Figure 7 - Block Diagram of High Frequency/High Voltage Power Supply. In the author’s version the primary

was wound concentric with the secondary winding. Placing the winding as shown is entirely satisfactory.

Figure 8 - Modified Hivolt Transformer on

Wood Base. The primary is wound

concentric with the secondary. Fuse holder is

behind the core but is not connected in this

photo. For a size reference, the oak base is

10 inches long.

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Vector 750 Watt Power Inverter User Manual Page 12

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