Title:
LIGHTING CIRCUIT UNIT FOR LIGHTING LOW VOLTAGE DISCHARGE LAMP
Document Type and Number:
Japanese Patent JPS61126795
Kind Code:
A
Abstract:
To provide for reliable ignition of low-pressure discharge lamps, particularly compact fluorescent lamps, operated at high frequency, for example in the order of about 45 kHz, an ignition circuit is connected in parallel to the lamp and serially with the electrodes (16, 17) thereof, which comprises a limiting capacitor (19) and the parallel circuit of a positive temperature coefficient (PTC) resistor (20) and a starting capacitor (18). The two capacitors (18, 19), together with an inductance (13, 14) in the operating circuit of the lamp, and a further capacity formed by a blocking capacitor (15), after preheating of the lamp electrodes by current flowing through the initially cold PTC resistor, will cause voltage rise across the resonance capacitors (18, 19) which will cause ignition of the lamp. The ratio of the limiting capacitor to the starting capacitor is in the order of 1:1 to 5:1, preferably about 2:1, resulting in gentle ignition in minimum time, for example about 1/2 second after energization of the lamp.
Inventors:
HANSU YUURUGEN FUEENRITSUHI
OIGEN SHIYUTATONIKU
URURITSUHI ROORU
OIGEN SHIYUTATONIKU
URURITSUHI ROORU
Application Number:
JP25519985A
Publication Date:
June 14, 1986
Filing Date:
November 15, 1985
Export Citation:
Assignee:
PATENT TREUHAND GES FUER ELEKTRISCHE GLUEHLAMPEN MBH
International Classes:
H05B41/16; H05B41/18; H05B41/24; H05B41/295; (IPC1-7): H05B41/16; H05B41/24
Domestic Patent References:
| JPS60218799A | 1985-11-01 |
Attorney, Agent or Firm:
Toshio Yano