JPS6489188A - Lighting device for preheating type discharge lamp - Google Patents
Lighting device for preheating type discharge lampInfo
- Publication number
- JPS6489188A JPS6489188A JP24384387A JP24384387A JPS6489188A JP S6489188 A JPS6489188 A JP S6489188A JP 24384387 A JP24384387 A JP 24384387A JP 24384387 A JP24384387 A JP 24384387A JP S6489188 A JPS6489188 A JP S6489188A
- Authority
- JP
- Japan
- Prior art keywords
- dimming
- short circuit
- impedance element
- circuit switch
- preheating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
PURPOSE:To allow the simple step dimming by adding a necessary impedance element and a dimming short circuit switch to a preheating type discharge lamp lighting device in a resonance operation. CONSTITUTION:A serial circuit of an inductance element 81 and a capacitor 82 is used as an impedance element 8 connected in series to an AC power source 5. A dimming short circuit switch 9 is closed at the time of the rated output, and the impedance element 8 is short-circuited. For the dimming, the dimming short circuit switch 9 is opened. The preheating current at the time of start is made 90% or more of that at the time of the closed circuit when the dimming short circuit switch 9 is opened, and its reduction rate is limited to 10% or less. This is to prevent the start delay due to the lack of preheating. On the other hand, the impedance element functions as the high impedance against the high frequency during the lighting after the start, thereby the tube current of the high-frequency component is decreased, and the objective of dimming or power saving can be attained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24384387A JPS6489188A (en) | 1987-09-30 | 1987-09-30 | Lighting device for preheating type discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24384387A JPS6489188A (en) | 1987-09-30 | 1987-09-30 | Lighting device for preheating type discharge lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6489188A true JPS6489188A (en) | 1989-04-03 |
Family
ID=17109775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24384387A Pending JPS6489188A (en) | 1987-09-30 | 1987-09-30 | Lighting device for preheating type discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6489188A (en) |
-
1987
- 1987-09-30 JP JP24384387A patent/JPS6489188A/en active Pending
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