There was a problem that it was difficult for a semiconductor device in the related art to increase the switching frequency of a step-up circuit, and it was difficult to stabilize an output current and an output voltage. A semiconductor device controls a step-up circuit including an inductor and a drive transistor to drive the inductor. The semiconductor device calculates upper and lower limits which determine the variable range of an input current, based on an output current and an input voltage, controls the switch timing of the drive transistor based on the relation between the upper and lower limits and the magnitude of the input current, and at the same time, corrects the upper and lower limits to be calculated, based on the magnitude of the difference between the output current and a target output current value as an ideal value of the output current.
SEMICONDUCTOR DEVICE
2018-03-29
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 |