JPH0353799U - - Google Patents
Info
- Publication number
- JPH0353799U JPH0353799U JP11242689U JP11242689U JPH0353799U JP H0353799 U JPH0353799 U JP H0353799U JP 11242689 U JP11242689 U JP 11242689U JP 11242689 U JP11242689 U JP 11242689U JP H0353799 U JPH0353799 U JP H0353799U
- Authority
- JP
- Japan
- Prior art keywords
- discharge lamp
- voltage
- power supply
- filament
- lighting device
- 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
- 238000001514 detection method Methods 0.000 claims 2
- 239000003990 capacitor Substances 0.000 claims 1
- 238000004804 winding Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 9
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Description
第１図は本考案の実施例の具体回路図、第２図
は同上の放電灯が正常な場合の説明図、第３図は
同上のフイラメントが断線した場合の説明図、第
４図は他の実施例の具体回路図、第５図は更に他
の実施例の具体回路図、第６図は従来例の具体回
路図、第７図は同上の放電灯が正常な場合の説明
図、第８図は他の従来例の具体回路図、第９図は
同上の放電灯が正常な場合の説明図、第１０図は
同上のフイラメントが断線した場合の説明図であ
る。
４……放電灯、ａ，ｂ……フイラメント、Ｅ１
……第１の直流電源、Ｅ２……第２の直流電源で
ある。
Fig. 1 is a specific circuit diagram of an embodiment of the present invention, Fig. 2 is an explanatory diagram when the above discharge lamp is normal, Fig. 3 is an explanatory diagram when the above filament is broken, and Fig. 4 is an illustration of the other cases. 5 is a specific circuit diagram of another embodiment, FIG. 6 is a specific circuit diagram of a conventional example, FIG. 7 is an explanatory diagram when the same discharge lamp is normal, and FIG. FIG. 8 is a specific circuit diagram of another conventional example, FIG. 9 is an explanatory diagram when the above discharge lamp is normal, and FIG. 10 is an explanatory diagram when the filament is broken. 4... Discharge lamp, a, b... Filament, E 1
. . . is the first DC power source, and E 2 is the second DC power source.
Claims (1)
を点灯させるインバータと、放電灯のフイラメン
トに接続されたダブルスポツト生成用の予熱トラ
ンスとを有し、放電灯の両フイラメントに夫々予
熱トランスの予熱巻線と直流カツト用のコンデン
サとの直列回路を並列に接続し、両フイラメント
の一端間にインピーダンス素子を接続し、上記イ
ンピーダンス素子を介してフイラメントに流れる
電流を検出してフイラメントの有無を検出する検
出回路を設けた放電灯点灯装置において、上記検
出回路に電流を流す第２の直流電源を設け、この
第２の直流電源の電圧を第１の直流電源の電圧よ
り低く設定したことを特徴とする放電灯点灯装置
。 (2) 第２の直流電源と直列に高周波電流逆流防
止用のインピーダンスを接続したことを特徴とす
る請求項１記載の放電灯点灯装置。[Claims for Utility Model Registration] (1) An inverter that converts a first DC power source into a high frequency to light a discharge lamp, and a preheating transformer for double spot generation connected to the filament of the discharge lamp; A series circuit consisting of a preheating winding of a preheating transformer and a DC cutting capacitor is connected in parallel to both filaments of the discharge lamp, and an impedance element is connected between one end of both filaments, so that the current flows to the filament via the impedance element. In a discharge lamp lighting device that is provided with a detection circuit that detects the presence or absence of a filament by detecting current, a second DC power supply that supplies current to the detection circuit is provided, and the voltage of the second DC power supply is converted into a voltage of the first DC power supply. A discharge lamp lighting device characterized in that the voltage is set lower than the voltage of the power supply. (2) The discharge lamp lighting device according to claim 1, further comprising an impedance for preventing high-frequency current backflow connected in series with the second DC power source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11242689U JP2504480Y2 (en) | 1989-09-26 | 1989-09-26 | Discharge lamp lighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11242689U JP2504480Y2 (en) | 1989-09-26 | 1989-09-26 | Discharge lamp lighting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0353799U true JPH0353799U (en) | 1991-05-24 |
| JP2504480Y2 JP2504480Y2 (en) | 1996-07-10 |
Family
ID=31660872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11242689U Expired - Lifetime JP2504480Y2 (en) | 1989-09-26 | 1989-09-26 | Discharge lamp lighting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2504480Y2 (en) |
-
1989
- 1989-09-26 JP JP11242689U patent/JP2504480Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2504480Y2 (en) | 1996-07-10 |
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