JPS5493876A - Apparatus for stepwise controlling brightness of fluorescent lamp - Google Patents

Apparatus for stepwise controlling brightness of fluorescent lamp

Info

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
Application number
JP16018677A
Other languages
Japanese (ja)
Inventor
Motohiro Kageyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP16018677A priority Critical patent/JPS5493876A/en
Publication of JPS5493876A publication Critical patent/JPS5493876A/en
Pending legal-status Critical Current

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.
JP16018677A 1977-12-30 1977-12-30 Apparatus for stepwise controlling brightness of fluorescent lamp Pending JPS5493876A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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