High-voltage power supply (for Chizhevsky's chandelier). Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Electronics in medicine
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The proposed high-voltage power supply (VBP) is used to create high voltage to power the electro-fluvial chandelier (Chizhevsky's chandelier) - a generator of negative air ions.
For a household chandelier, the recommended voltage is 30 ... 35 kV. The proposed VBP fully meets the high safety requirements during operation.
VBP consists of a mains voltage rectifier on a diode bridge VD1, a filter capacitor C1 and a high-voltage half-bridge self-oscillator on a DA1 chip (K1182GGZ). Chip DA1 converts the rectified mains voltage to high frequency (30...50 kHz). Transformer T1 serves to create the necessary voltage on the control windings L1, L3 and for galvanic isolation of the high-voltage winding from the network.
(click to enlarge)
WBP works as follows. The rectified mains voltage is supplied to the IC DA1, the starting chain R2-C2 starts the IC oscillator. Chains R3-C3 and R4-C4 set the frequency of the oscillator. In this case, R3 and R4 stabilize the duration of the corresponding half-cycles of the frequency of the generated pulses.
The output voltage is increased hundreds of times by the output winding L4 of the transformer and is fed to a rectifier assembled according to the voltage multiplier circuit on high-voltage capacitors C7 ... C12 and diodes VD2 ... VD7. The rectified voltage of negative polarity is supplied to the chandelier through the limiting resistor R5.
Details and construction
The line filter capacitor C1 must be designed for an operating voltage of 450 V (for example, K50-29), C2 - of any type for a voltage of 30 V. Capacitors C5, C6 are selected within 0,022 ... 0,22 μF for an operating voltage of at least 250 V , for example, type K71-7, K73-17. Multiplier capacitors C7 ... C12 - type KVI-3 for a voltage of 10 kV. It is possible to replace it with any of the series K15-4, K73-4, POV and others with an operating voltage of at least 10 kV.
High-voltage diodes VD2 ... VD7 - type KTs106G (replacement with KTs105D is possible). Limiting resistor R5 - type KEV-1. It can be replaced with three MLT-2 type resistors of 10 MΩ each. As a transformer, you can use any horizontal transformer from a black and white TV. The high-voltage winding is left, the rest are removed, and new windings are placed in their place.
Windings L1, L3 contain 7 turns of PEL wire 0 0,2 mm. and winding L2 - 90 turns of the same wire.
Particular attention should be paid to the installation of capacitors and multiplier diodes. The connecting wires between them should be as short as possible, and the soldering of the leads should be even and smooth. The high-voltage wire must be passed through the insulating rubber bushing in the EBP housing.
As a high-voltage wire connecting the VBP with the chandelier, you can use a television antenna cable of the brand RK with a diameter of 8 mm, having previously removed the outer insulation and the shielding braid.
Establishment
The control windings L1 and L3 should have a voltage of 4 ... 5 V. If there is no output voltage, it is necessary to swap the conclusions of the windings L1 and L3. Then you need to make sure that there is no corona, for which the VBP is turned on in the dark. If purple lights appear on the power leads, this is a sign of corona. Usually the corona effect is accompanied by the smell of ozone. With the VBP turned off, the corona areas are covered with varnish UR-231 or poured with molten paraffin.
Author: V.Shinkarenko, Fryazino, Moscow Region; Publication: N. Bolshakov, rf.atnn.ru
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