Economical lamp with powerful LED lamps for the assembly table of a radio amateur. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Lighting

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The article describes a simple and very effective lamp based on a matrix of three powerful white LED lamps.

Have you ever seen super-bright LED flashlights? Powerful LED lamps have nothing to do with them.

Powerful LED lamps are built on the basis of silicon carbide (SiC) semiconductor crystals and have a number of advantages compared to similar silicon products: maximum time between failures; low supply voltage; instant ignition; complete extinction; absence of lead and mercury; resistance to electrostatic influences more than 2 kV; a lens built into the case, which makes it easy to match the crystal with any optical system, a small area of ​​the base of the case. The appearance of the 1 W LED lamp is shown in fig. one.

Advantages of high-power LED lamps compared to traditional incandescent lamps: record-breaking efficiency due to the maximum number of lumens of light flux per 1 W of power consumption, which allows you to work from the battery for several hours continuously with the full feeling of an incandescent lamp on; safe DC supply voltage 12...25 V is used; a smooth, flicker-free light is created that soothes the eyes, while the brightness can be smoothly adjusted by a resistor from zero to maximum; unprecedented service life - up to 10 years of continuous operation.

The appearance of the luminaire on high-power LED lamps BM6120 is shown in fig. 2.

Applications of the device:

1. on the assembly table of a radio amateur, as a table lamp to illuminate the table;
2. in everyday life as a floor lamp to create local lighting;
3. in the car interior as a reliable and economical source of lighting;
4. as decorative and artistic lighting elements.

Fig. 3

The brightness of the glow of 240 lm according to the light sensations corresponds to the glow of a 40-watt incandescent lamp. Your table lamp will consume only 3 W (instead of 40...60 W) and serve you for a very long time.

Schematic diagram of the lamp is shown in Fig.3.

On the 555 timer, a variable duty cycle generator with a frequency of 200 Hz is assembled. It is used to change the brightness of the LED lamp. The timer generates a PWM signal.

A constant current source for an LED lamp is built on the LM3404 microcircuit, with the help of a resistor in the feedback circuit, the current is set:

I=Uref/R,

where Uref is the reference voltage inside the microcircuit, with which the comparator of the microcircuit compares the voltage across this resistor. This chip also has a dimming input, to which a PWM signal is supplied from the 555 timer chip in order to be able to control the current of the LED lamp.

The block diagram of the LM3404 chip is shown in Figure 4.

In the extreme left position of the potentiometer, a zero value is obtained, when it is necessary to completely extinguish the LED lamp, in the other extreme position of the potentiometer, a "one" is issued, while the LED lamp shines at full power. In intermediate positions, a PWM signal is generated with a constant frequency, but a varying duty cycle (from zero to maximum), providing smooth adjustment of the illumination of the LED lamp.

Diodes 1MQ2N.VD10 -BAV100 / T3, VD99 - BZX1-C4D are used as VD84 .VD12. Inductor L1 - CDRH6D28NP-101NC with an inductance of 100 μH, capacitor C1 with a capacity of 1 μFx50 V.

The appearance of a matrix consisting of three XR7090WT-L1-0001 LED luminaires is shown in Fig. 1a. Due to ease of repetition, the wiring diagram and printed circuit board drawings are not shown. The regulator device is structurally made on a printed circuit board with dimensions of 40x30 mm. The wiring diagram of the regulator is shown in Fig. 5, the appearance of the regulator's printed circuit board is shown in Fig. 6 (the view of the printed circuit board from the side of the components) and Fig. 7 (the view of the printed circuit board from the side of the conductors).

Turning on the device should not cause any difficulties. It is enough to connect a connector with a wire from the board of LED lamps, a connector with a wire from a variable resistor and a connector with a power wire to the main board of the regulator. All connectors have a different configuration, so an erroneous connection is excluded.

Apply power 12...25 V, observing the polarity (red wire - "plus"). By rotating the variable resistor slider, set the most comfortable brightness of the LED lamps.

To avoid overheating and failure of the LED matrix at maximum power, it must be placed on a heat sink. To improve thermal contact when installing a heatsink, it is recommended to use heat-conducting paste of the KPT-8 type or a thermally conductive spacer (electrical isolation of the LED matrix board from the heatsink is not required).

To increase the illumination of the workplace, the design allows you to connect in series an additional LED matrix of three LED lamps. Unsolder the white wire from one of the modules and solder the black wire from the additional matrix to it, solder the white wire from the additional wire to the freed contact of the standard matrix of LED lamps. In this case, with a supply voltage of 24 V, you will get twice the luminous flux up to 500 lm.

To save your time and relieve you of the routine work of searching for the necessary components and manufacturing printed circuit boards, "MASTER KIT" offers a ready-made block BM6120 "Lamp on high-power LED lamps" and an additional LED module BM6020.

Author: Yu. Sadikov, Moscow; Publication: radioradar.net

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