POWER SUPPLY CIRCUIT FOR SUPPLYING LEDS FROM A PRIMARY DC VOLTAGE

The invention relates to a feed circuit for supplying power to LEDs from a primary DC voltage, wherein in the current circuit of at least one LED, a regulating transistor, a current sensor and a comparator are provided. The output end of the comparator is connected to the control input end of the re...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	Koller, Jan, Weber, Emanuel
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING ORSUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES INGENERAL CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY GENERATION PERFORMING OPERATIONS TRANSPORTING VEHICLES IN GENERAL
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Beschreibung
Zusammenfassung:	The invention relates to a feed circuit for supplying power to LEDs from a primary DC voltage, wherein in the current circuit of at least one LED, a regulating transistor, a current sensor and a comparator are provided. The output end of the comparator is connected to the control input end of the regulating transistor, wherein the rated value of a current is input into the first input end of the comparator and the actual value of the current is input into the second input end of the comparator, wherein a capacitive pre-converter is arranged and converts the primary DC voltage into an intermediate circuit voltage according to the level of the intermediate circuit. The capacitive pre-converter has a longitudinal switch controlled by the PWM output end of a microcontroller, wherein the inputend of the microcontroller is supplied with a voltage value proportional to the primary DC voltage, and the microcontroller contains a lookup table indicative of a relationship between the supplied voltage value and the duty cycle of a signal at the PWM output end to convert the primary DC voltage to the intermediate circuit voltage, wherein an LED current circuit is at an intermediate circuit capacitor.