LED bicycle headlight. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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LED bicycle headlight. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Lighting

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A conventional bicycle headlight is powered by a generator driven by a bicycle wheel. Since there are no batteries in the circuit of bicycle equipment, the voltage at the output of such a generator is highly dependent on the speed of rotation of the wheel, and the brightness of the headlight is extremely uneven.

Using super-bright white LEDs and a pulsed DC/DC stabilized voltage converter as a light source, it is possible to make a bicycle headlight, the brightness of which will not only be higher than with an incandescent lamp, but will also be maintained stably high in a very wide range of supply voltage.

The figure shows a bicycle headlight circuit with three super-bright LEDs and a pulsed DC / DC converter on the LT1932 chip.

LED bicycle headlight

The high and relatively stable brightness of the LEDs is maintained in the supply voltage range from 2 to 12 V at a maximum current through the LEDs of 50 mA.

The switching regulator generator operates at a frequency of about 1 MHz (the frequency depends on the resistance R1).

Inductor L1 - ready, allowing a current of at least 100 mA.

Author: Barabanov V.N.

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