Generator of light pulses on IFC-50. Scheme, description

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Generator of light pulses on IFC-50. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Lighting

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To decorate a home party or disco, one or more light pulse generators assembled on the basis of flash lamps IFC-50 or similar, which were previously widely used in flashlights, may come in handy. The rest of the parts can be taken from failed compact fluorescent lamps (CFLs). I talked about the parameters of these parts and their use in amateur designs in the article "From the details of energy-saving fluorescent lamps ..." ("Radio", 2012, No. 6, pp. 26-28).

Light pulse generator on IFC-50
Fig. 1

The scheme of the proposed generator of light pulses is shown in fig. 1. The storage capacitor C3 provides power to the flash lamp EL1 (IFK-50). Its inclusion (ignition) is carried out by a relaxation generator assembled on a dinistopax VS1-VS3, a resistor R4, a capacitor C2 and a pulse step-up transformer T1. A rectifier is assembled on the diode VD1, the transistor VT1 blocks the operation of the generator while charging the storage capacitor C3.

The device works as follows. After connecting to the network, the storage capacitor C3 begins to charge through the current-limiting resistors R1, R3 and the diode VD1. At this time, due to the voltage drop across the resistor R3, the transistor VT1 is open, so the voltage across the capacitor C2 does not exceed a few fractions of a volt. When the capacitor C3 is almost completely charged and the current through the resistor R3 decreases to about 0,5 mA, the transistor VT1 closes and the charging of the capacitor C2 begins. When the voltage across it reaches approximately 100 V, the dinistors VS1-VS3 open and the capacitor C2 quickly discharges through them and the primary winding of the pulse transformer T1. At the same time, a high-voltage voltage pulse is formed in its secondary winding. It enters the ignition electrode of the lamp EL1, it flashes and the capacitor C3 is discharged. After the lamp goes out, it starts charging again and all the described processes are repeated.

Due to this construction of the circuit, the ignition pulse is formed only after charging the storage capacitor C3. With the ratings of the elements indicated in the diagram, the interval between flashes is approximately 1,5 ... 2 s. Capacitor C1 suppresses impulse noise penetrating the base of the transistor VT1 from the network, and increases the stability of the lamp.

Light pulse generator on IFC-50
Fig. 2

The device is mounted in a plastic case with an outer diameter of 46 mm from the CFL. Most of the parts are placed on a printed circuit board (Fig. 2) made of fiberglass laminated on one side with a thickness of 1 ... 1,5 mm. The design as a whole is illustrated in Fig. 3. The flash lamp 2 is fixed with hot glue on a plastic reflective plate 3 made of a DVD-ROM (reflective surface to the lamp). A printed circuit board 4 with elements is also attached to its opposite side with hot glue.

The flash lamp is connected to the board with pieces of insulated wire passed through the holes in it. In the same way, the board is connected to the base. Then this "assembly" is fixed in the body 5 and closed with a transparent cover 1 made of organic glass. The appearance of the lamp is shown in fig. 4.

Light pulse generator on IFC-50
Fig. 3

You can do without a printed circuit board. In this case, the elements are fixed with hot glue on the reflector plate 3 and wired.

Light pulse generator on IFC-50
Fig. 4

The step-up transformer T1 is made of a ballast choke with a W-shaped ferrite magnetic circuit from a CFL. Its winding is used as a secondary one, and the primary one - 8 turns of MGTF-0,2 wire - is wound over it. Capacitor C3 is made up of two or more smaller capacitors. The larger the total capacitance, the brighter the flash of the EL1 lamp.

It should be noted that the guaranteed number of flashes of the IFC-50 lamp (with a maximum energy of 50 J) is 20000...30000. In this device, the flash energy is significantly less, so the lamp life will be longer.

If the lamp flashes erratically and at different intervals, the reason may be insufficient energy of the ignition pulse. To increase it, you can connect an additional capacitor (C2T) with a capacity of 2 μF with the same nominal voltage in parallel with the capacitor C0,1 (there is a place for it on the board). You can also install another one of the same type in series with the VS1-VS3 dinistors.

Author: I. Nechaev

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