A signal is described herein that provides fight output for automotive, rail, ship traffic and/or illumination control that includes a light emitting diode (LED) array, wherein the LED array includes three groups of disparate colored LEDs. A power supply unit provides independent power to each of the three LED groups. Each LED group power supply unit includes an input controlled switch connected to a power line to provide power to the LED array. An input under voltage / over voltage circuit monitors the voltage level of the power line for enabling or disabling the input controlled switch according to the voltage level of the power line. A flyback transformer converts the power received from the power line from an alternating or a continuous current signal to a direct current signal output to the LED array. A dummy load draws power addltional to the LED array and a dummy load detection circuit monitors the dummy load to insure that the power drawn by the load is greater than or equal to a predetermined threshold. A light out detection circuit monitors the light output of the LED array via an optical sensor.

Tricolor LED traffic signal

A current source and an associated method for supplying current to a load such as an arrangement of LEDs. The intensity of the supplied current varies as a function of the temperature of the load. The intensity of the current is temperature-dependent and limited to a predefined maximum. The temperature dependence is achieved by the component parts that are used without the help of special temperature sensors. The current source is supplied with a reference voltage derived from an integrated circuit. The reference voltage is tapped from a port of the IC and therefore it is switchable. The reference voltage is used to produce a control current, which is fed through a driver stage to produce the current of the current source. Elements in the current source limit the current's intensity and change it as a function of temperature.

Process and circuitry for controlling a load

Verfahren zur Versorgung einer Last (12, 25, D1 bis Dn) mit einem Strom (Iq) aus einer Stromquelle (11, 20), wobei die Stromstarke des Stroms (Iq) temperaturabhangig ausgestaltet und auf eine maximal vordefinierte Stromstarke begrenzt wird, wobei der Stromquelle (11) eine Referenzspannung (UC) zugefuhrt wird, die von einem Port eines integrierten Schaltkreises (μC) abgegriffen wird und schaltbar ist, und wobei mittels dieser Referenzspannung (UC) ein Steuerstrom erzeugt wird, mittels dessen uber eine Treiberstufe (23) der Strom (Iq) der Stromquelle (11) erzeugt wird, wobei durch Elemente in der Stromquelle (11) der Strom (Iq) in seiner Stromstarke begrenzt und temperaturabhangig verandert wird, dadurch gekennzeichnet, dass die Stromquelle (11, 20) aus einer Stromeinpragungseinheit (21), einer Spannungsveranderungseinheit (22), einer Referenzspannungsquelle (24) und einer Treiberstufe (23) gebildet wird und die Stromeinpragungseinheit (21) durch einen ersten Transistor (TS) und dessen Beschaltung mit vier Widerstanden (R5, R6, RS, RK) gebildet wird, wobei der Steuerstrom, der der Treiberstufe...

Verfahren und Schaltungsanordnung zur Ansteuerung einer Last

The method involves simulating a filament lamp in a regulating circuit (12) by a load switched parallel to a light i.e. LED, to be monitored, where the regulating circuit restores a part of power consumed during a load simulation in en electrical system. A load voltage (Ub) is produced by a switching regulator with a switch-mode regulation circuit in the regulating circuit for regulating a constant voltage. A control circuit (16) is switched on and off by a switch (S4) e.g. transistor. An input capacitor (C1) is arranged in the regulating circuit for buffering an input voltage. An independent claim is also included for a switch for monitoring vehicle light.

Method and switch for monitoring vehicle lighting with bulb simulation

Light i.e. rear wall light, monitoring method for e.g. passenger car, involves simulating filament lamp in regulating circuit by load switched parallel to light i.e. LED, where circuit restores part of power consumed during simulation

The arrangement (7) is equipped with an evaluation and control unit (3) monitoring supply voltage (Uv). This controls a current flow simulator (4) such that a predetermined, minimally-required total current (IG) flows through the lamp arrangement, when the voltage falls below a predetermined threshold (US), until a predetermined minimal supply voltage (Um) is reached.

Lighting arrangement for vehicle using e.g. light emitting diode, includes unit monitoring supply voltage and controlling current flow simulator

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Lighting arrangement for vehicle using e.g. light emitting diode, includes unit monitoring supply voltage and controlling current flow simulator