Title:
【発明の名称】車輌用放電灯の点灯回路
Document Type and Number:
Japanese Patent JP2587718
Kind Code:
B2
Abstract:
A lighting circuit for a vehicular discharge lamp comprises a DC-to-AC converter, a lamp voltage detector, a lamp current detector, a voltage-current controller, and a power change reducing means. The DC-to-AC converter converts a DC voltage into an AC voltage and supplies it to the discharge lamp. The lamp voltage detector acquires a detection signal concerning a lamp voltage of the discharge lamp. The lamp current detector acquires a detection signal concerning a lamp current of the discharge lamp. The voltage-current controller produces a lamp current controller instruction signal generated with respect to the lamp voltage upon reception of the detection signal from the lamp voltage detector, and supplies a control signal to the DC-to-AC converter so as to minimize differences between the instruction signal and the detection signal from the lamp current detector, thereby controlling the output voltage of the DC-to-AC converter. This controller has at least a lighting acceleration area for producing the lamp-current control instruction signal to permit supply of greater power than rated power of the discharge lamp and a steady power control area for performing steady power control of the discharge lamp with the rated power, as a control area based on lamp voltage-lamp current characteristic. The power change reducing means suppresses a change in power supply to the discharge lamp with respect to the lamp voltage at a time of transition to the steady power control area from the lighting acceleration area, thereby shortening the time required for flux of light from the discharge lamp to become stable.
Inventors:
Sasaki Masaru
Atsuhiko Murata
Satoru Oda
Atsuhiko Murata
Satoru Oda
Application Number:
JP26330090A
Publication Date:
March 05, 1997
Filing Date:
October 01, 1990
Export Citation:
Assignee:
Koito Manufacturing Co., Ltd.
International Classes:
H05B41/24; H05B41/282; H05B41/288; H05B41/38; B60Q1/04; (IPC1-7): H05B41/24; B60Q1/04; H05B41/29
Domestic Patent References:
| JP2136342A | ||||
| JP2136343A | ||||
| JP2215090A | ||||
| JP279395A | ||||
| JP2278695A | ||||
| JP2174092A | ||||
| JP52120582A | ||||
| JP63301493A | ||||
| JP62259391A | ||||
| JP6472494A | ||||
| JP59130086A | ||||
| JP5945897U | ||||
| JP6229877B2 |
Attorney, Agent or Firm:
Yuji Komatsu