JPS54137877A - Device for lighting on discharge lamp - Google Patents
Device for lighting on discharge lampInfo
- Publication number
- JPS54137877A JPS54137877A JP4477778A JP4477778A JPS54137877A JP S54137877 A JPS54137877 A JP S54137877A JP 4477778 A JP4477778 A JP 4477778A JP 4477778 A JP4477778 A JP 4477778A JP S54137877 A JPS54137877 A JP S54137877A
- Authority
- JP
- Japan
- Prior art keywords
- discharge lamp
- current
- output signal
- positive
- circuit
- 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 correct the asymmetry of current of a discharge lamp and prevent its flicker, by separately controlling the turn-on time of a switching semiconductor element at the positive and negative half cycles of AC power. CONSTITUTION:If the magnitude a current bypassed from the discharge lamp 30 differs depending on its polarity, and output signal is generated by a current averaging circuit 52 and amplified by an error amplifier circuit 53 so that an asymmetry generator circuit 54 produces an output signal having a positive voltage whose magnitude differs between the positive and negative half cycles in response to an entered error signal. The latter output signal is applied to a trigger circuit 55 to generate a control signal to separately control the turn-on time of the switching semiconductor element 40 at each half cycle of the power 10. As a result, the mean value of the current of the discharge lamp at each cycle is made zero.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4477778A JPS54137877A (en) | 1978-04-18 | 1978-04-18 | Device for lighting on discharge lamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4477778A JPS54137877A (en) | 1978-04-18 | 1978-04-18 | Device for lighting on discharge lamp |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54137877A true JPS54137877A (en) | 1979-10-25 |
JPS5735549B2 JPS5735549B2 (en) | 1982-07-29 |
Family
ID=12700839
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4477778A Granted JPS54137877A (en) | 1978-04-18 | 1978-04-18 | Device for lighting on discharge lamp |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54137877A (en) |
-
1978
- 1978-04-18 JP JP4477778A patent/JPS54137877A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS5735549B2 (en) | 1982-07-29 |
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