A lighting circuit (20) comprising a switching converter (30) structured to supply electric power to a semiconductor light source (10); and a converter controller (32) structured to control the switching converter, wherein the converter controller (32) comprises a current detection circuit (34) structured to generate a current detection signal that corresponds to a driving current supplied from the switching converter to the semiconductor light source; a hysteresis comparator (36) structured to compare the current detection signal with an upper threshold signal (VTHH) and a lower threshold signal (VTHL), and to generate a control pulse according to a comparison result; a driver (38) structured to drive a switching transistor (M1) of the switching converter according to the control pulse; a frequency detection circuit (40) structured to generate a frequency detection signal that indicates a frequency of the control pulse.
LIGHTING TOOL FOR VEHICLE AND LIGHT SOURCE LIGHTING CIRCUIT
BELEUCHTUNGSWERKZEUG FÜR FAHRZEUG UND LICHTQUELLENBELEUCHTUNGSSCHALTUNG
OUTIL D'ÉCLAIRAGE POUR VÉHICULE ET CIRCUIT D'ÉCLAIRAGE DE SOURCE LUMINEUSE
25.11.2020
Patent
Elektronische Ressource
Englisch
IPC: | 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 / 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 / H05B ELECTRIC HEATING , Elektrische Heizung |
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