LED spotlights for lighting and method for generating short pulses of light using high pulsed LED operating voltages and applications for use thereof

摘要

A new control for an LED is proposed in order to be able to generate short light pulses of high luminosity by means of this LED. The control is carried out according to the proposal via an H-bridge in the way that the LED can be flooded particularly fast with charge carriers or that charge carriers can be removed from the LED very quickly. When using LEDs in the primary colors not only brightness light pulses, but also color angle pulses can be generated, which can be used in particular for light transit time measurement, preferably by means of time of flight cameras (TOF cameras). Preferably motor vehicle headlights are equipped with such bulbs with such H-bridge control. They can be used for a variety of purposes in the car. The control device (ST) of the H-bridge is designed so that the "PAn" state, in which the LED is switched on in the pulse mode, is no longer taken as a switch-on time (τ) and the "PAus" state in the the LED is turned off no longer than a clearing time (τ) is taken. The clearing time (τ) and the turn-on time (τ) are smaller than the carrier lifetime (τ) in the PN junction of the first light-emitting diode (LED1). This allows higher voltages to be used for pulsed turning on and off of the LED, which speeds up this process.