JPS6472493A - Discharge lamp lighting device - Google Patents
Discharge lamp lighting deviceInfo
- Publication number
- JPS6472493A JPS6472493A JP22800187A JP22800187A JPS6472493A JP S6472493 A JPS6472493 A JP S6472493A JP 22800187 A JP22800187 A JP 22800187A JP 22800187 A JP22800187 A JP 22800187A JP S6472493 A JPS6472493 A JP S6472493A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voltage
- inverter circuit
- discharge lamp
- time
- 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 keep off any overinput of an inverter circuit while facilitating start lighting by raising the extent of reference voltage in an error amplifier to a voltage detector circuit only at a given period of time after power is ON, in a discharge lamp lighting device using the inverter circuit. CONSTITUTION:Simultaneously with power making, a timer circuit 12 gets starting and a reference voltage to be added to an error amplifier 10 to a volt age detector circuit 5 detecting the load voltage of a discharge lamp 4 comes into the state of a higher side till a switch 11 is selected after a specified period of time by this timer circuit 12, and, frequency of an inverter circuit 3 is con trolled by output of this amplifier 10 to light the discharge lamp. After the elapse of a timer setting, the switch 11 is turned on and the reference voltage is selected to a low voltage. Consequently, at the time of starting, a higher secondary voltage is secured so that easy start lighting takes place, but after that, the secondary voltage is lowered even when a lamp is in the last period of its service life so that input of the inverter circuit will not become excessive, thus circuit parts of the inverter circuit are protected from breakdown.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22800187A JPS6472493A (en) | 1987-09-11 | 1987-09-11 | Discharge lamp lighting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22800187A JPS6472493A (en) | 1987-09-11 | 1987-09-11 | Discharge lamp lighting device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6472493A true JPS6472493A (en) | 1989-03-17 |
Family
ID=16869623
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22800187A Pending JPS6472493A (en) | 1987-09-11 | 1987-09-11 | Discharge lamp lighting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6472493A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04163886A (en) * | 1990-10-26 | 1992-06-09 | Matsushita Electric Works Ltd | Discharge lamp lighting device |
-
1987
- 1987-09-11 JP JP22800187A patent/JPS6472493A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04163886A (en) * | 1990-10-26 | 1992-06-09 | Matsushita Electric Works Ltd | Discharge lamp lighting device |
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