JPS646399A - Electric discharge lamp lighting device - Google Patents
Electric discharge lamp lighting deviceInfo
- Publication number
- JPS646399A JPS646399A JP7277587A JP7277587A JPS646399A JP S646399 A JPS646399 A JP S646399A JP 7277587 A JP7277587 A JP 7277587A JP 7277587 A JP7277587 A JP 7277587A JP S646399 A JPS646399 A JP S646399A
- Authority
- JP
- Japan
- Prior art keywords
- discharge lamp
- electric discharge
- high frequency
- transformer
- 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.)
- Granted
Links
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
PURPOSE:To prevent the inflow of an over-current to the output side of a high frequency lighting circuit by connecting a filter circuit which has low impedance to high frequency waves and high impedance to low frequency waves to the output side of a high frequency lighting circuit in series. CONSTITUTION:On the output side of a oscillating transformer 4, a filter circuit 5 (for example condenser) which shows high impedance to commercial frequency and low impedance to high frequency is inserted between a secondary coil and an electric discharge lamp 10. Accordingly, when the electric discharge lamp 10 is lit, the electric discharge lamp 10 lights normally. And at that time, the filaments 11, 12 of the electric discharge lamp 10 is preheated as usual by the commercial frequency preheating voltage of a preheating transformer 20. Further, if both ends of the electric discharge lamp have short-circuited, an over-current tries to flow through the secondary coil of an oscillating transformer 4 by the commercial frequency preheating voltage of the preheating transformer 20, but the over-current is suppressed by the filter circuit 5.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62072775A JP2617463B2 (en) | 1987-02-28 | 1987-03-26 | Discharge lamp lighting device |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62-46529 | 1987-02-28 | ||
JP4652987 | 1987-02-28 | ||
JP62072775A JP2617463B2 (en) | 1987-02-28 | 1987-03-26 | Discharge lamp lighting device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS646399A true JPS646399A (en) | 1989-01-10 |
JP2617463B2 JP2617463B2 (en) | 1997-06-04 |
Family
ID=26386622
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62072775A Expired - Lifetime JP2617463B2 (en) | 1987-02-28 | 1987-03-26 | Discharge lamp lighting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2617463B2 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55109298U (en) * | 1979-01-29 | 1980-07-31 |
-
1987
- 1987-03-26 JP JP62072775A patent/JP2617463B2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55109298U (en) * | 1979-01-29 | 1980-07-31 |
Also Published As
Publication number | Publication date |
---|---|
JP2617463B2 (en) | 1997-06-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term | ||
FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 11 Free format text: PAYMENT UNTIL: 20080311 |