HANNOVER MESSE 2020, 20 - 24 April
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Economical lighting

Novel parallel LED wiring enables high power-saving potential.

Logo Karlsruher Institut für Technologie


Karlsruher Institut für Technologie

Exhibitor details
Exhibitor details
Logo Economical lighting

Product description

The transition from conventional, power-guzzling street-lighting to LED technology is already in full swing. Modernising technology pays its way. New wiring developed by KIT could cut the cost of street-lighting by up to 30 to 40 per cent. The KIT Light Technology Institute (LTI) innovation is especially suitable for big lights upwards of 2,000 lumen. Less bright lights can currently be fed by available systems wired in series. But these are not suitable for larger applications, since the voltage limit for SELV (Safety Extra Low Voltage) is reached at a maximum of 40 LEDs, corresponding to 120 volts, from which on LEDs have to be wired in parallel. However, wiring a larger number of LEDs in parallel is difficult because the failure of a single diode will result in the entire system or at least a part of it collapsing. Thus reliable operating of lights is not possible. The novel KIT LED modules can remedy this. Mid-power LEDs are mounted in any number of series that are linked via parallel wiring. An upstream current regulator ensures that each LED series is supplied with the same amount of power. This is accomplished with a control loop via an averaging circuit. The respective current values are measured and reported to the control loop, which generates a mean value to which the individual rows are then adjusted. The failsafe performance of the LED-module increases because destruction of one or more LEDs doesn't cause a failure of the entire module anymore. The other LEDs continue operating. In addition, the use of standard components allows for cheap production. Alongside street-lighting, modules for further fields of application could be developed on the basis of the new wiring.

You can get an overview of this technology at KIT stand. Detailed information can be exchanged individually in contact with the responsible scientific employees of KIT after the industry fair.

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