High voltage transformer. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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Trying to repeat the design of the power supply for the Chizhevsky chandelier [1], I could not find a suitable basis for the manufacture of a high-voltage transformer. The obsolete deflecting system of the TV that had expired, or rather, the ferrite magnetic circuit from it, helped to get out of the difficulty.
As it turned out later, the magnetic circuits of the deflecting system of various TVs, including imported ones, are suitable for business. The best results were obtained with a magnetic core having a larger outer diameter of 78 mm and a smaller outer diameter of 50 mm. First, both parts of the magnetic circuit are glued tightly, without a gap, with superglue or epoxy glue. Excess glue protruding from the gap should not be removed. Then the resulting ferrite ring is wrapped with an insulating tape made of fluoroplast or varnished cloth.
Next, the primary winding is wound, consisting of 30 turns of PEV-2 wire with a diameter of 0,51-0,8 mm. The coils are placed evenly around the entire circumference of the magnetic circuit. Outside, the primary winding is covered with several layers of insulating tape. The secondary winding - 1 500 - 2000 turns of PELSHO 0,1 wire - is wound turn to turn on the inside of the magnetic circuit. Each winding layer is covered with several layers of thin fluoroplastic tape, making sure that the wire turns of each upper winding layer are separated by tape from the underlying one. The connection points of the wire in cases of its breakage must be soldered and insulated with short pieces of insulating tape. Outside, the finished transformer is covered with molten pure paraffin and wrapped with several layers of insulating tape. The view of the finished product is shown in the figure.
The specified number of turns is selected empirically.
Transformers manufactured according to the described method work reliably, have been tested for long-term operation and provide a voltage of about 30 kV at the output of a three-stage multiplier. The high voltage at the output was measured with a kilovoltmeter assembled according to the scheme from the article [2]. With some caution, the voltage can be estimated from the length of the gap pierced by a spark at the rate of 1 mm - 1 kV. The length of the stably punched gap should be approximately 25 mm. If the voltage is insufficient, you will have to add another stage to the multiplier.
Literature:
1. Ivanov B. "Chizhevsky's chandelier" - do it yourself. - Radio, 1997, No. 1, p. 36,37.
2. Prosyanov A. Power supply and kilovoltmeter for "Chizhevsky's chandelier". - Radio, 2008, No. 1, p. 27, 28.
Author: A. Uskov, p. Stone-Fisher of the Primorsky Territory; Publication: radioradar.net
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