JPS6454697A - Lighting device for discharge lamp - Google Patents
Lighting device for discharge lampInfo
- Publication number
- JPS6454697A JPS6454697A JP21178387A JP21178387A JPS6454697A JP S6454697 A JPS6454697 A JP S6454697A JP 21178387 A JP21178387 A JP 21178387A JP 21178387 A JP21178387 A JP 21178387A JP S6454697 A JPS6454697 A JP S6454697A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- current
- trq1
- signal
- emissionless
- 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
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
PURPOSE:To prevent a main transistor from being damaged due to an excessive load current at the time of emissionless condition by detecting the emissionless condition and thereby controlling a timer circuit. CONSTITUTION:Of the secondary current obtained from a secondary coil of a current transistor CT, only the current of the same phase with that of a corrector current of a main transistor TrQ1 of an inverter circuit IV is returned to the base of the TrQ1 through a half-wave current return circuit FB. On the other hand, a timer circuit TM is made to perform time counting action with a signal from the secondary coil. A cutoff circuit ST stops a base current of the TrQ1 with a signal of the time counting finish. In this case, the control of the circuit TM is performed with a detection signal of a circuit EL by detecting an emissionless condition occurring in the last stage of the life of a discharge lamp l with the detection circuit EL so that the generation timing of the time count finish signal is advanced. As a result, the on-time of the TrQ1 can be shortened to prevent the TrQ1 from being damaged.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21178387A JP2617481B2 (en) | 1987-08-26 | 1987-08-26 | Discharge lamp lighting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21178387A JP2617481B2 (en) | 1987-08-26 | 1987-08-26 | Discharge lamp lighting device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6454697A true JPS6454697A (en) | 1989-03-02 |
JP2617481B2 JP2617481B2 (en) | 1997-06-04 |
Family
ID=16611527
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21178387A Expired - Lifetime JP2617481B2 (en) | 1987-08-26 | 1987-08-26 | Discharge lamp lighting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2617481B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02281598A (en) * | 1989-04-21 | 1990-11-19 | Tokyo Electric Co Ltd | Discharge lamp lighting device |
-
1987
- 1987-08-26 JP JP21178387A patent/JP2617481B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02281598A (en) * | 1989-04-21 | 1990-11-19 | Tokyo Electric Co Ltd | Discharge lamp lighting device |
Also Published As
Publication number | Publication date |
---|---|
JP2617481B2 (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) |
Free format text: PAYMENT UNTIL: 20080311 Year of fee payment: 11 |