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Making emergency battery lighting


It often happens that there is no electricity for various reasons, and there is no lighting. Then we put out candles, lanterns, and, at worst, kerosene lamps. Candles are smoked and flammable, the flashlight has a directional light and not always a large glow resource. I propose to make an alternative.

This design will use available components, mainly from older computer power supplies. Schematic diagram of the device is shown below:

The power source of the circuit is a 12V battery, with a capacity of at least one and a half ampere hours. ATTENTION: at the output of the circuit we get a constant voltage with an amplitude of 220 volts, BE CAREFUL !!! The role of the light source will be performed by the "housekeeper" bulb, with a power of 8 - 15 watts.

Components borrowed from a computer power supply:
- pulse transformer;
- PWM controller TL494;
- high voltage capacitors (C3, C4);
- high-frequency diodes (VD1, VD2);

The remaining components must be purchased. All components are mounted on a single-sided printed circuit board, 50mm in size. by 54mm. (minimum dimensions, excluding space for fasteners).

The PCB file is made in the program Sprint-Layout 6.0 (5.0) and is attached at the end of the article, in the archive. The file shows the board view from the component side.

Output transistors must be installed on a heat sink, a radiator, for example, from the processor of an old computer. A properly assembled device does not need adjustment and will work immediately. When turned on, the board consumes shortly about 1.5 amperes per capacitor charge, then at the end of the charge 0.75 amperes per hour.

Since there is no case yet, the radiator for testing was not screwed on accordingly.


The lamp lights up almost immediately, and shines as if from a regular mains. The lamp can be placed either next to the housing or on the ceiling as an alternative lamp.

ATTENTION: at the output of the circuit we get a constant voltage with an amplitude of 220 volts, BE CAREFUL !!!

Files: plata.zip [13.29 Kb] (downloads: 388)
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8 comments
A nakuya for emergency lighting to fence the inverter? Buy a pair of LEDs from the Chinese (10W- $ 0.35) and stir up the driver for them to adjust the PWM brightness. Here energy will be used up nowhere :)
Author
For a long time, consumption is about 0.8 A per hour, and machine batteries, as far as I know, are about 45 Amp hours. Count more than a day will shine.
In my area very often there is a power outage, then due to weather conditions, then some kind of repair work is underway. Battery emergency light is what you need. Today I have already begun to do everything, I collected everything in a day. Only my question is, how long will a fully-charged, almost new, battery-powered engine battery last?
And I am for the fact that the wiring is hidden in a box, albeit a primitive one of non-conductive cardboard charges. To the top, bring out the start button, the cartridge from the house-lamp for the safe use in the darkness of pitch-cut electricity. By the way, how long will the device illuminate without recharging?
By the way, if you replace the "budget" electrolytic capacitors with tantalum ones (for a nominal value of 500 microfarads they are not difficult to find), you can coolly reduce the size of the homemade product.
Author
The charger is a separate circuit and device, I wrote the case, of course it is necessary, and it will be.
In fact, the device is a makeshift UPS. True, the author "forgot" to make a charger for the battery. Speaking of charging - the homemade product is perfect for charging mobile phones and tablets.
The scheme is excellent, do not complain. By the end result, I note that the open circuit board and wires are not brought to good: it will become dusty or spill anything on all this beauty and it will stop working. Again: the light went out and as in the darkness getting out this structure did not break it. Maybe you need to adapt a certain carrying case? It will be more convenient, agree.

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