Converter for power supply of fluorescent indicators. Scheme, description

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Converter for power supply of fluorescent indicators. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters

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Segments of luminescent indicators (IV-3, IV-6, etc.) can be connected to the information outputs of the K176IE4 and K176IEZ counters and directly - with a 9-volt power supply to the microcircuits, the brightness of the indicators is quite sufficient. However, to power their incandescent circuits, another source is required - with a voltage of 0,8...1 V, capable of delivering a current of 40...50 mA to the indicator.

In Fig. Figure 1 shows a schematic diagram of a converter that allows you to use a microcircuit power supply to power the filaments of fluorescent indicators.

Converter for powering fluorescent indicators
Fig. 1

The converter is a symmetrical multivibrator with a transformer load. The magnetic core of the transformer is made up of two ring cores M3000MN 16x10x4,5 mm. Winding I is wound in two wires; it contains 2x180 turns of PEV-2 0,12 wire. The midpoint of winding I is formed by the end of one half and the beginning of the other connected together. Winding II - 16 turns of PEV-2 0,44 wire - is wound over winding I. Both of them must be distributed evenly over the core. (Recall that ferrite M3000MN has a low volumetric resistance and, being a good abrasive, is easily “included” in the circuit. Therefore, the sharp edges of the core must first be smoothed, and then an insulating coating must be applied to it.)

Table 1 shows the dependence of the output voltage Uout, consumed by the current converter Ipot and its efficiency h on n - the number of IV-3 type luminescent indicators connected to its output winding. The converter can also operate from a 5 V source. To do this, you need to reduce the number of turns of winding I to 2x100 turns of PEV-2 0,17 wire and change the values of resistors and capacitors: R1=R2=11 kOhm.

Table 1

n	Uout, V	Ipot, mA	h
1	0,83	9	0,53
2	0,81	13	0,70
3	0,79	16	0,81
4	0,78	20	0,84
5	0,77	24	0,86
6	0,76	27	0,89

R3=R4=1,5 kOhm, C1=C2=0,068 µF. This version of the converter under the same conditions has Uout = 0,83...0,73 V, Iin = 14...46 mA, h = 0,61...0,88.

See other articles Section Voltage converters, rectifiers, inverters.

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