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
2020-11-25
Patent
Electronic Resource
English
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 |
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