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.
SPEISESCHALTUNG ZUR VERSORGUNG VON LEDS AUS EINER PRIMÄREN GLEICHSPANNUNG
POWER SUPPLY CIRCUIT FOR SUPPLYING LEDS FROM A PRIMARY DC VOLTAGE
CIRCUIT D'ALIMENTATION DESTINÉ À ALIMENTER DES DEL À PARTIR D'UNE TENSION CONTINUE PRIMAIRE
2020-05-13
Patent
Elektronische Ressource
Deutsch
IPC: | H05B ELECTRIC HEATING , Elektrische Heizung / B60Q ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL , Anordnung von Signal- oder Beleuchtungsvorrichtungen, deren Einbau oder Halterung oder deren Schaltkreise bei Fahrzeugen allgemein / H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen |
Stromrichterschaltung zum Erzeugen einer potentialgetrennten Gleichspannung
Europäisches Patentamt | 2023
|IuD Bahn | 1994
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