JPS6445091A - Discharge lamp lighting device - Google Patents
Discharge lamp lighting deviceInfo
- Publication number
- JPS6445091A JPS6445091A JP20205287A JP20205287A JPS6445091A JP S6445091 A JPS6445091 A JP S6445091A JP 20205287 A JP20205287 A JP 20205287A JP 20205287 A JP20205287 A JP 20205287A JP S6445091 A JPS6445091 A JP S6445091A
- Authority
- JP
- Japan
- Prior art keywords
- lamp
- region
- current
- reactor
- transistor
- 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)
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
Abstract
PURPOSE:To facilitate re-ignition of a lamp by connecting a saturable reactor between filaments on the non-power side of a lamp, and furnishing a means to switch this reactor for dimming of the lamp. CONSTITUTION:Transfer from 100% lighting to dimmed lighting is made by alternately operating transistors Tr1, Tr2 as a dimming signal. That is, when the transistor Tr1 is turned on, current flows to a power supply E1, primary winding n11 of saturable reactor 7, and closed loop (1) of transistor Tr1 to put the saturable reactor 7 into saturated state, and the apparent inductance on the secondary side becomes small. Therefore, the current from an oscillator transformer OT does no flow to a lamp 2 but bypasses to the secondary side of the reactor 7, so that the lamp current lessens in the region T1. In the region T1', on the other hand, the transistor Tr2 is turned on, and current flows to closed loop (2) to provide the same state as in the region T1, while in the region T2 the two transistors Tr1, Tr2 are turned off, and the same current as 100% lighting flows in the lamp 2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20205287A JPS6445091A (en) | 1987-08-13 | 1987-08-13 | Discharge lamp lighting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20205287A JPS6445091A (en) | 1987-08-13 | 1987-08-13 | Discharge lamp lighting device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6445091A true JPS6445091A (en) | 1989-02-17 |
Family
ID=16451141
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20205287A Pending JPS6445091A (en) | 1987-08-13 | 1987-08-13 | Discharge lamp lighting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6445091A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03131100U (en) * | 1990-04-13 | 1991-12-27 | ||
JPH0668981A (en) * | 1992-08-18 | 1994-03-11 | S I Electron:Kk | Fluorescent lamp lighting device |
-
1987
- 1987-08-13 JP JP20205287A patent/JPS6445091A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03131100U (en) * | 1990-04-13 | 1991-12-27 | ||
JPH0668981A (en) * | 1992-08-18 | 1994-03-11 | S I Electron:Kk | Fluorescent lamp lighting device |
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