JPS5493876A - Apparatus for stepwise controlling brightness of fluorescent lamp - Google Patents
Apparatus for stepwise controlling brightness of fluorescent lampInfo
- Publication number
- JPS5493876A JPS5493876A JP16018677A JP16018677A JPS5493876A JP S5493876 A JPS5493876 A JP S5493876A JP 16018677 A JP16018677 A JP 16018677A JP 16018677 A JP16018677 A JP 16018677A JP S5493876 A JPS5493876 A JP S5493876A
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- brightness
- turned
- mode
- lamp
- 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
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
Abstract
PURPOSE:To eliminate delay in switching the operating mode of a fluorescent lamp between its full-lighted mode and brightness-controlled mode, by pre-charging a capacitor for determining the conduction phase angle to a certain voltage in lighting the lamp to its full capacity, and controlling a switching element at a predetermined conduction angle in switching the operating mode of lamp from its full-lighted condition to brightness-controlled mode. CONSTITUTION:When wall switch 4 is turned OFF and then turned ON again, in the state that changeover switch 6 is set at a brightness-controlled mode position X2, relay Ry is energized instantaneously at the time when the wall switch 4 is turned ON, since electricity in capacitor 22 is already discharged through resistance 21. Similarly, realy contact (r) is also closed instataneously, so that electricity in capacitor 3 is discharged through resistance 10. However, the capacitor 22 is then charged via power source E, a first contact 7 of changeover switch 6, capacitor 14, diode bridge 16, capacitor 3, diode 17, base emitter of transistor Tr, diode bridge 16 and power source E, so that conduction phase angle of switching element 1 is changed from its maximum to minimum.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16018677A JPS5493876A (en) | 1977-12-30 | 1977-12-30 | Apparatus for stepwise controlling brightness of fluorescent lamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16018677A JPS5493876A (en) | 1977-12-30 | 1977-12-30 | Apparatus for stepwise controlling brightness of fluorescent lamp |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5493876A true JPS5493876A (en) | 1979-07-25 |
Family
ID=15709674
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16018677A Pending JPS5493876A (en) | 1977-12-30 | 1977-12-30 | Apparatus for stepwise controlling brightness of fluorescent lamp |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5493876A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0226127A (en) * | 1988-07-14 | 1990-01-29 | Matsushita Electric Works Ltd | Touch switch device for discharge lamp |
-
1977
- 1977-12-30 JP JP16018677A patent/JPS5493876A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0226127A (en) * | 1988-07-14 | 1990-01-29 | Matsushita Electric Works Ltd | Touch switch device for discharge lamp |
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