About the modernization of the desktop air ionizer. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Medicine

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The introduction of a high negative voltage regulator on a chandelier into the ionizer circuit is considered. This allows you to change the intensity of the radiation of ions, which is important when operating the ionizer with various types of chandeliers emitting air ions. A simple design of a kilovoltmeter is proposed. Options for changing the circuitry of the ionizer are proposed.

Exploitation air ionizer (IV) with various designs of chandelier-emitters [1] requires adjustment of the voltage supplied to the chandelier.

Two adjustment options were tested. In the first, in parallel with the zener diode VD5 (D814B), a variable resistor with a resistance of 1 kOhm is connected, connected by a two-pole. A decrease in the resistance of this resistor causes a corresponding decrease in the supply voltage of the DD1 generator chip and the VT1 driver. The voltage on the winding I of the pulse transformer T1 decreases, and the negative voltage on the chandelier also decreases accordingly.

In the second variant, the resistor R12 is replaced with a variable resistor included in a two-terminal circuit. In this embodiment, a smoother voltage adjustment on the chandelier is obtained.

Of course, the high voltage can be adjusted by changing the duty cycle of the pulses of the master oscillator DD1, but this reduces the efficiency, and the operation of the generator becomes unstable.

If the IW scheme is repeated according to the author's description, then there are no problems with the adjustment. Proceed as follows. The elements of the voltage multiplier circuit C7 and VD9 are connected to the winding II of the transformer T1. Capacitor C7 is connected to this winding through a resistor with a resistance of 5 ... 10 kOhm and a power of 2 watts. The remaining elements of the multiplier are temporarily unsoldered. It is convenient to mount the indicated resistor and elements C7 and VD9 inside the IV housing, and not in the multiplier block. This reduces the influence of the cable capacitance, and in addition, it becomes possible to place a kilovoltmeter inside the IV case.

Parallel to the VD9 diode, a DC kilovoltmeter is connected. The simplest version of it is a 100 μA microammeter and a 100 MΩ resistor. The deviation of the microammeter pointer by the last division corresponds to a voltage of 10 kV. Having set the mains voltage of 150 V with LATR, they achieve the maximum voltage on the kilovoltmeter with trimmer resistors R9 and R10. Without much difficulty, a rectified voltage of 3 kV or more is obtained. This voltage is more than enough for the variant of the multiplier according to the scheme of Fig. 1 [1]. As it turned out later, the IV functions normally even without capacitor C1.

The circuit has a kind of high voltage stabilization when the mains voltage changes from 150 to 220 V (the change in high voltage was no more than 20%).

If you do not need high measurement accuracy, then you can measure the voltage across the VD9 diode, it is about 10 times less than on the chandelier. By the way, in this embodiment, the effect of connecting a kilovoltmeter on the output voltage is much less.

It is possible to install cheaper transistors, for example, KT809 and KT812 as a key transistor VT2. So that the transistor does not fail, it is checked for the real value of Uke. max, for example, according to the method [2].

When placing the IV in a metal case, it is necessary to carefully insulate the places of possible voltage breakdowns of 3 ... 4 kV. This voltage easily breaks through an air gap of 3...4 mm.

How to make an emitter from a piece of tin is described in [3]. Here are other easy-to-implement designs of chandelier-emitters. By itself, a large area of ​​​​the emitter does not give anything. Radiation of air ions occurs only where the surface is pointed. If the emitter is of the needle type, then its efficiency depends on the number of needles and the radius of the needle tip. Wire radiators are effective if the wire radius is less than 0,075 mm.

In general, the designer himself must decide on the choice of the emitter, especially if there is no desire to repair the ceilings. Chizhevsky's chandelier in the original is designed for high ceilings, and its location at 50 ... 80 cm from the ceiling does not save the ceiling from dust. The situation can be radically changed only by the method described in [4]. The most rational way out is to modify the design of the emitter so that there is no binding to the ceilings.

Mobility is the main advantage of a desktop air ionizer. And adjusting the voltage on the chandelier allows you to adjust the number of emitted ions.

References:

1. Zyzyuk A.G. Desktop air ionizer//Electrician. - 2002. - No. 2. - C.5.
2. Zyzyuk A.G. Selection of transistors for powerful UMZCH//Radioamator. - 2001. No. 6. - p.6.
3. Kalinin P. Ionizer//Radio amateur. - 2001. - No. 2. - P.20.
4. Zyzyuk A.G. Air ionizers//Radioamator. - 2000. - No. 5. - P.37.

Author: A.G. Zyzyuk

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