JPS5477476A - Fluorescent lamp lighting apparatus - Google Patents
Fluorescent lamp lighting apparatusInfo
- Publication number
- JPS5477476A JPS5477476A JP14537377A JP14537377A JPS5477476A JP S5477476 A JPS5477476 A JP S5477476A JP 14537377 A JP14537377 A JP 14537377A JP 14537377 A JP14537377 A JP 14537377A JP S5477476 A JPS5477476 A JP S5477476A
- Authority
- JP
- Japan
- Prior art keywords
- switching element
- energized
- power source
- fluorescent lamp
- trigger signal
- 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 provide a fluorescent lamp lighting apparatus, in which fluorescent lamp is pre-heated sufficiently at the time of starting by energizing a switching element at the 90° point of each half cycle of AC power source for a certain time period after the AC power source is connected, whereby cold cathode disharge can be prevented.
CONSTITUTION: When power source 1 is connected, a voltage-responsive switch 13 is turned ON at about 90° point of each half cycle of AC power source, in the OFF-period of transistor 17 that is determined by resistances 15, 18 and capacitor 19, whereby trigger signal for switching element 5 is produced and thus element 5 is energized. When the switching element 5 is energized, a phase-advancing current begins to be passed through inductance element 2 and capacitor 3, but it becomes almost zero at the time when the trigger signal for switching element 5 is produced, so that element 5 tends to be turned OFF. However, since the next trigger signal is applied to the gate of switching element 5, phase-advancing current again begins to be passed, so that switch 5 is energized completely. Thus, filaments f1, f2 are pre-heated sufficiently in a time period when transistor 17 is not energized.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14537377A JPS5477476A (en) | 1977-11-30 | 1977-11-30 | Fluorescent lamp lighting apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14537377A JPS5477476A (en) | 1977-11-30 | 1977-11-30 | Fluorescent lamp lighting apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5477476A true JPS5477476A (en) | 1979-06-20 |
Family
ID=15383713
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14537377A Pending JPS5477476A (en) | 1977-11-30 | 1977-11-30 | Fluorescent lamp lighting apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5477476A (en) |
-
1977
- 1977-11-30 JP JP14537377A patent/JPS5477476A/en active Pending
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