Driver of the lighting module

Abstract

A circuit and method for driving a lighting module comprising at least two semiconductor light emitting elements (D1, D2) connected in series in a first operating mode. When the operating voltage (101) is lower than a predetermined threshold, the second operating mode is detected (102), and in the second operating mode, at least two semiconductor light emitting elements (D1, D2) can be driven alternately (102, S1 , S2).

Description

technical field [0001] The invention relates to a circuit and method for driving a lighting module. Background technique [0002] Light sources, such as those used in vehicles, require a specific operating voltage range. Thus, for example, a voltage in the range of 8V to 16V can operate the light source at full brightness. But in addition, the light source with reduced brightness will also be required to operate in the voltage range of 8V to 16V. [0003] In a series circuit consisting of multiple light emitting diodes (LEDs), the forward voltage is typically between 6V and 8V. To set the forward voltage, a step-down converter can be used, for example, in the range of 8 V to 16 V, starting from the mentioned operating voltages. [0004] However, there is the problem that such a series circuit of LEDs no longer emits sufficiently brightly at an operating voltage of, for example, 6V. The reason for this is that the luminous current of the light-emitting diodes is already t...

AI Technical Summary

Problems solved by technology

[0004] However, there is a problem that such a series circuit composed of LEDs can no longer emit light brightly enough at an operating voltage of, for example, 6V

[0005] In this case there is a disadvantage that such measures increase the price of the machine equipment of the light source and also make the machine equipment larger due to the additional required components

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