JPS54137878A - Light adjuster for discharge lamp - Google Patents
Light adjuster for discharge lampInfo
- Publication number
- JPS54137878A JPS54137878A JP4614578A JP4614578A JPS54137878A JP S54137878 A JPS54137878 A JP S54137878A JP 4614578 A JP4614578 A JP 4614578A JP 4614578 A JP4614578 A JP 4614578A JP S54137878 A JPS54137878 A JP S54137878A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- sss
- glow starter
- discharge lamp
- turned
- 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)
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
PURPOSE:To prevent the action of a glow starter when a discharge lamp is turned on to emit adjusted light, by connecting a parallel circuit consisting of the glow starter and an impedance element in series with a voltage-switched semiconductor element across the non-power sides of filaments of the lamp. CONSTITUTION:When a control circuit 5 is energized by an AC power source 1 and a bidirectional switching element 2 is turned on at a predetermined phase, a voltage is applied to an SSS 8 through an impedance element through the glow starter 6 is open. As a result, the SSS is turned on. Discharge is then caused in the glow starter 6 to preheat the discharge lamp 4. When the glow starter 6 is opened again, the discharge lamp 4 is lighted on. At that time, the voltage of the lamp 4 falls and the terminal voltage of the SSS 8 becomes lower than the break-over voltage. This results in turning off the SSS 8. If the break-over voltage of the SSS 8 is set higher than the discharge start voltage of the glow starter 6, the SSS is not turned on until just before the reclosing voltage of the discharge lamp reaches the break-over voltage of the SSS 8.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4614578A JPS54137878A (en) | 1978-04-18 | 1978-04-18 | Light adjuster for discharge lamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4614578A JPS54137878A (en) | 1978-04-18 | 1978-04-18 | Light adjuster for discharge lamp |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54137878A true JPS54137878A (en) | 1979-10-25 |
Family
ID=12738794
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4614578A Pending JPS54137878A (en) | 1978-04-18 | 1978-04-18 | Light adjuster for discharge lamp |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54137878A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59156399U (en) * | 1983-04-05 | 1984-10-20 | 三洋電機株式会社 | discharge lamp dimmer |
-
1978
- 1978-04-18 JP JP4614578A patent/JPS54137878A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59156399U (en) * | 1983-04-05 | 1984-10-20 | 三洋電機株式会社 | discharge lamp dimmer |
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