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Save this page to your favorites so you can always come back and download a new eBook. Don't forget to share.pdf Drive with your friends and family so they can take advantage of free online reading too!It is known in the art to use a light emitting diode (LED) array, comprising a plurality of LEDs as light sources. A first solution to overcome the limitation in the maximum number of the LEDs that can be used in an array comprises dividing the LED array into a plurality of sub-arrays, wherein each sub-array can have a predetermined number of LEDs. Each sub-array is then individually supplied with power by a voltage regulator.
The control and the current distribution amongst the sub-arrays is carried out with a number of opto-isolators, that are placed in series between the sub-arrays and the power supply source. In this type of LED array, the number of opto-isolators is equal to the number of sub-arrays divided by the number of LEDs per sub-array. A further drawback is that at least one opto-isolator is required per sub-array for controlling that sub-array.
Another solution to overcome the limitation in the maximum number of the LEDs that can be used in an array is to employ an array of LEDs of which the number can be greater than the maximum number of LEDs that can be used in an array. When a voltage is supplied to such an array of LEDs, a light beam is formed from the array of LEDs that can be larger than the desired light beam. If it is necessary to reduce the size of the light beam, then a reduction of the size of the array of LEDs is required.
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