Switching regulator circuit and vehicular lamp

Details Switching regulator circuit and vehicular lamp Switching regulator circuit and vehicular lamp

2005-04-05

2005-04-05

Vu, David (Department: 2828)

Electric lamp and discharge devices: systems

Special application

Vehicle

C315S307000, C315SDIG007, C363S016000

Reexamination Certificate

active

06876153

ABSTRACT:
A switching regulator circuit for controlling power supplied to a load, includes: a switching device for repeatedly going on or off to control a voltage or a current applied to the load; a detector for detecting a supply voltage or a supply current supplied to the load; and a controller for controlling a duration ratio of a period in which the switching device is on or off based on the supply voltage or supply current detected by the detector, so as to control a value of the voltage applied to the load. The controller includes: a saw-tooth wave generation unit for charging and discharging a saw-tooth wave generation capacitor grounded at one end so as to change a voltage at another end of the saw-tooth wave generation capacitor to a saw-tooth wave; a charge/discharge controller for changing a ratio of a charge rate and a discharge rate of the saw-tooth wave generation capacitor based on the supply voltage or supply current detected by the detector; and a switching device controller for comparing a voltage value of the saw-tooth wave generation capacitor with a predetermined threshold value and controlling the duration ratio of the period in which the switching device is on or off based on the comparison result.

REFERENCES:
patent: 5212428 (1993-05-01), Sasaki et al.
patent: 5671128 (1997-09-01), Nakamura et al.
patent: 2001-215913 (2001-08-01), None

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