High frequency electroepilator. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Electronics in medicine

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In cosmetology, various devices and preparations are used to remove hair from the surface of the skin. Of course, you can easily remove hair with a razor or cream, but after a day or two this procedure will have to be repeated. To prevent hair from growing, it is necessary to remove the hair follicles themselves. For these purposes, a high-frequency epilator has been developed (the prototype is the BREVILUX device, previously produced by the CMEA countries), the scheme of which is shown in Fig. 1. In addition to the "Epilatio" (E1) outlet for hair removal, there is also an "Incisio" (E2) outlet, to which a cosmetic scalpel is connected.

Fig.1. Schematic diagram of the HF epilator (click to enlarge)

Removing hair and making incisions using high-frequency exposure has significant advantages, since the blood is sintered at the site of the incision, and the skin grows evenly, without scarring, which is very important in cosmetology.

The output radiation power is regulated by a variable resistor R1 and is selected individually - depending on the capacitance of the patient's body. After turning on SA1 and warming up the device, take the hair with tweezers with one hand, stick the probe with a needle into the bulb with the other, and press the pedal with the SA2 button with your foot. If the hair is easily pulled out, then the radiation power is sufficient, otherwise the slider of the resistor R1 moves up (according to the scheme), and the procedure is repeated. For convenience, you can use a tripod with a magnifying glass and a lamp for lighting. The body of the device is metal, and during operation it must be grounded.

The diagram of a transistor epilator is shown in Fig. 2. The alternating voltage from the winding III T1 is supplied to the diode bridge VD1 ... VD4, rectified and filtered by capacitance C3. After pressing the SA2 pedal, the K1 relay is activated and, with its contacts K1.1, supplies an alternating voltage of 300 V from the winding II of the transformer T1 to the diode bridge VD5 ... VD8, and from it to the voltage regulator VT1, R2, R3. The adjustment range is 0 ... 300 V. On the elements VT2, C7, C9, L1, L2, a generator tuned to a frequency of 2 MHz is made. Coil L1 is the generator load.

Fig.2. Schematic diagram of a transistor epilator

The initial offset is set by resistor R4. Feedback on the alternating current is carried out through the capacitor C7 and the coil L2, which sets the required generation frequency. Capacitor C9 is necessary for reliable start of the generator at different supply voltages. Capacitances C1, C2, C4, C6 reduce the interference entering the network.

Details

Capacitors C1, C2, C7 ... C9 - type K15-5 for a voltage of 3 kV; C4, C5, C6 - the same type for a voltage of 500 V; C3 - K50-35. Variable resistor R2 - PPB-ZV with a power of 5 W, relay K1 - RES9 (passport RS4.529.029-00), rated for 24 V.

The T1 transformer is wound on a self-made two-section frame to increase electrical safety. The network winding is wound on the first section, on the second - all the rest. Transformer iron was used from two vertical scan transformers of old tube TVs with a total cross section of 7,28 cm². The primary winding T1 contains 1540 turns of PEV-2 wire d0,18 mm, winding II has 2100 turns of PEV-2 d0,15 mm, winding III - 140 turns of PEV-2 d0,15 mm.

Coil L1 is wound on a frame d10 mm. and contains 360 turns of wire PEV-2 d0,2 mm, laid in bulk in three sections. The L2 coil is wound on a d8 mm frame. It has 100 turns of wire PEV-2 d0,2 mm, laid turn to turn in one layer. All parts of the epilator, except for T1, C1, C2 and HL1, are placed on a printed circuit board measuring 50x55 mm, shown in Fig. 3.

Fig.3. PCB 50x55mm

The electric circuit of the electroepilator

A diagram of a small-sized epilator is shown in Fig. 4. This scheme is similar to the previous one. It removed the power transformer, which has large dimensions and weight. Resistor R1 used smaller dimensions and power, so I had to increase the gain of the voltage regulator by adding another transistor. Coil L1 is replaced by a high-frequency transformer T1.

Fig.4. Scheme of a small-sized epilator (click to enlarge)

Resistor R1 - type SP-0,4. Capacitors C1 ... C3 - K73-17 for a voltage of 400 V; C4 ... C6 - K15-5 for a voltage of 1,6 kV. Button SA1 - MP1-1 type. The blocking filter L1 is wound on a K10x6x3 M600NM ferrite ring with a MGTF d0,35 mm wire folded in half and contains 15 turns; L2 - industrial choke DPM-0,4. The T1 transformer is a fluoroplastic cylindrical frame with an inner diameter of 4 mm, an outer diameter of 10 mm and a length of 12 mm. The winding on the frame is wound round to round with a PELSHO wire d0,2 mm. It has 150 turns, a layer of fluoroplastic film is laid between the layers. A DPM-0,4 100 μH choke is inserted inside the frame. The printed circuit board for this epilator with dimensions of 15x155 mm is made of double-sided fiberglass 2 mm thick (Fig. 5).

Fig.5. 15x155mm mini epilator circuit board

The body is a polypropylene pipe with an inner diameter of 18 mm and a length of 185 mm. The "N" terminal can not be grounded, but then it should be pulled in the bundle along with the mains wires to the plug and connected to the neutral wire there, since it is the counterweight of the needle.

During procedures, the needles must be replaceable to prevent the transmission of infection. For their quick replacement, the easiest way is to make a collet clamp.

Attention! Procedures should be carried out only after consulting a doctor.

Author: S. Abramov, Orenburg. E-mail: asmoren@mail.ru; Publication: radioradar.net

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