Headlight with LEDs. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Headlight with LEDs. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Lighting

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The LED bicycle headlight described in article [1] immediately interested me. Since my factory bicycle headlight and generator for it only worked at high speeds, it was decided to improve their performance. I wanted to repeat it, but I didn’t have at hand the microcircuit that was proposed by the author, but I found another one - a DC/DC converter of the LT1615 type from Linear Technology [2].

LED headlight

Having assembled the circuit, I began testing it. It turned out that this microcircuit made it possible to achieve high road illumination even at low bicycle speeds. The input voltage from the bicycle generator was supplied to a microcircuit, the output of which powered three super-bright white LEDs of the L-53PWC type from Kingbright, connected in series. The voltage drop across the LEDs in the nominal current range (15...30 mA) is about 3,1 V. It is possible (although not necessary) to connect a resistance of about 2-4 Ohms to them in series.

A 4,7 µH inductor and a high-speed Schottky diode of the MBR0540 type were used as inductance.

The design of the light emitter was the most important. In order not to remake the lantern (if necessary, return it to its previous form, i.e. you could insert a regular light bulb), LEDs were soldered to the base of a regular light bulb and filled with epoxy resin. This design of the light emitter was rigid and practical.

Literature

1. Drums V. LED bicycle headlight // Radio designer - 2008 - No. 4. - S. 26.
2. LT1615 linear-tech.com/pdf/15151fa.pdf

Author: P.Bobonic Uzhgorod, Ukraine

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