Title:
DC/AC CONVERTER FOR IGNITION AND POWER FEED OF GAS DISCHARGE LAMP
Document Type and Number:
Japanese Patent JPH01134898
Kind Code:
A
Abstract:
PURPOSE: To minimize energy consumption in a lamp electrode to improve efficiency by shunting the lamp by a third semiconductor switching element getting conductive while the lamp electrode is preheated and thereafter stopping a converter for a predetermined short time to ignite the lamp. CONSTITUTION: A discharge lamp 1 is shunted by a capacitor 11 or a third semiconductor switching element 12 getting conductive while electrodes 2, 3 are preheated. After the lamp electrode is preheated, a converter is stopped for a short time by turning-on and -off a transistor 19 and the shortcircuit of control of the semiconductor switching element 9 with the aid of a diode 13, capacitors 14, 15, a resistor 16, a capacitor 17 and a mono-stable multivibrator 18. This short time is shorter than a time taken for cooling the lamp electrode to the temperature lower than the radiation temperature. Further, the third semiconductor switching element 12 is a TRIAC, while the converter is stopped for a period longer than a TRIAC recovering time.
Inventors:
PIETERU YAN BORUFUISU
ADORIANUSU MARUCHINUSU YOHANES
YOHANESU MARIA FUAN MEURUSU
ADORIANUSU MARUCHINUSU YOHANES
YOHANESU MARIA FUAN MEURUSU
Application Number:
JP25840588A
Publication Date:
May 26, 1989
Filing Date:
October 15, 1988
Export Citation:
Assignee:
PHILIPS NV
International Classes:
H05B41/295; H05B41/24; (IPC1-7): H05B41/24
Domestic Patent References:
| JP61071995B | ||||
| JPS59103298A | 1984-06-14 | |||
| JPS61273897A | 1986-12-04 |
Attorney, Agent or Firm:
Akihide Sugimura (1 outside)