JPH0590894U - Discharge lamp starter - Google Patents
Discharge lamp starterInfo
- Publication number
- JPH0590894U JPH0590894U JP3477792U JP3477792U JPH0590894U JP H0590894 U JPH0590894 U JP H0590894U JP 3477792 U JP3477792 U JP 3477792U JP 3477792 U JP3477792 U JP 3477792U JP H0590894 U JPH0590894 U JP H0590894U
- Authority
- JP
- Japan
- Prior art keywords
- discharge lamp
- coefficient thermistor
- temperature coefficient
- positive temperature
- voltage
- 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.)
- Withdrawn
Links
- 239000007858 starting material Substances 0.000 title description 2
- 239000004065 semiconductor Substances 0.000 claims description 7
- 230000007423 decrease Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
(57)【要約】
【目的】 寿命になった放電灯を交換する場合に、直ぐ
に交換できること。
【構成】 電圧判別回路６の両端に、正特性サーミスタ
５の動作時の抵抗値より比較的低抵抗の数百Ω〜数ｋΩ
の抵抗Ｒ4 を接続する。今、正特性サーミスタ５が動作
温度を超え数百Ω程度になると、抵抗Ｒ4 と正特性サー
ミスタ５の抵抗値の分圧により、電圧判別回路６の両端
電圧が下がり、サイリスタ４はオンしない。サイリスタ
４がオンせず、電流が正特性サーミスタ５に流れなくな
ると、正特性サーミスタ５は冷却し、抵抗値が下がる
が、電圧判別回路６の分圧が上がり、再びサイリスタ４
がオンし、正特性サーミスタ５の温度が上がり、再びサ
イリスタ４はオンしない。この動作を繰り返し継続し、
正特性サーミスタ５の温度は動作温度を少し越えたＢ点
付近で安定する。この場合、正特性サーミスタ５の動作
温度までの差が少ないため、正特性サーミスタ５の温度
上昇が制限される。
(57) [Summary] [Purpose] When a discharge lamp that has reached the end of its life is to be replaced, it can be replaced immediately. [Structure] At both ends of the voltage discriminating circuit 6, several hundred Ω to several kΩ having a resistance relatively lower than the resistance value of the positive temperature coefficient thermistor 5 during operation.
Connect the resistor R 4 of. Now, when the positive temperature coefficient thermistor 5 exceeds the operating temperature and reaches about several hundred Ω, the voltage across the voltage determination circuit 6 drops due to the voltage division of the resistance value of the resistor R 4 and the positive temperature coefficient thermistor 5, and the thyristor 4 does not turn on. When the thyristor 4 does not turn on and the current stops flowing to the positive temperature coefficient thermistor 5, the positive temperature coefficient thermistor 5 cools and the resistance value decreases, but the partial pressure of the voltage determination circuit 6 increases and the thyristor 4 again.
Turns on, the temperature of the positive temperature coefficient thermistor 5 rises, and the thyristor 4 does not turn on again. Repeat this operation repeatedly,
The temperature of the positive temperature coefficient thermistor 5 stabilizes near point B, which is slightly higher than the operating temperature. In this case, since the difference in the operating temperature of the PTC thermistor 5 is small, the temperature rise of the PTC thermistor 5 is limited.
Description
【０００１】[0001]
本考案は、例えば蛍光灯を始動させる放電灯始動装置に関するものである。 The present invention relates to a discharge lamp starting device for starting a fluorescent lamp, for example.
【０００２】[0002]
図３はこの種の放電灯始動装置の従来例を示し、交流電源ＡＣに安定器２を介 して蛍光灯のようなランプ１が接続されている。このランプ１のフィラメントの 非電源側の両端には、始動装置７が接続されている。すなわち、バイメタルで構 成される熱応動スイッチ３と、フィラメント予熱用のサイリスタ（半導体スイッ チ）４と、温度上昇に伴い抵抗値が上昇する正特性サーミスタ５との直列回路が ランプ１のフィラメントの非電源側の両端に接続されている。 FIG. 3 shows a conventional example of this type of discharge lamp starting device, in which a lamp 1 such as a fluorescent lamp is connected to an AC power source AC via a ballast 2. A starting device 7 is connected to both ends of the filament of the lamp 1 on the non-power source side. That is, the series circuit of the thermal response switch 3 composed of bimetal, the thyristor (semiconductor switch) 4 for preheating the filament, and the positive temperature coefficient thermistor 5 whose resistance value increases with the temperature rise is connected to the filament of the lamp 1. It is connected to both ends on the non-power supply side.
【０００３】 また、上記サイリスタ４のゲートには電圧判別回路６が接続されており、この 電圧判別回路６は、抵抗Ｒ1 〜Ｒ3 、ツエナーダイオードＺＤ1 とで構成されて いる。この電圧判別回路６は、一定の電圧値以上になった場合に、ツエナーダイ オードＺＤ1 がオンして、サイリスタ４をオン駆動して、ランプ１に予熱電流を 流すものである。A voltage discriminating circuit 6 is connected to the gate of the thyristor 4, and the voltage discriminating circuit 6 is composed of resistors R 1 to R 3 and a zener diode ZD 1 . The voltage discriminating circuit 6 turns on the Zener diode ZD 1 to drive the thyristor 4 to turn on and supply a preheating current to the lamp 1 when the voltage exceeds a certain value.
【０００４】 今、ランプ始動時において、電源をオンすると、始動装置７の両端にはほぼ電 源電圧が印加されるため、熱応動スイッチ３及び正特性サーミスタ５を介して電 圧判別回路６が動作し、サイリスタ４がオンして予熱電流がランプ１のフィラメ ントに流れる。 この予熱電流が一定時間流れると、熱応動スイッチ３が開離し、予熱電流が遮 断されることにより安定器２よりパルス電圧が発生し、ランプ１を始動させる。 ランプ１が始動すれば始動装置７の両端電圧はランプ電圧となり低くなるため、 サイリスタ４はオンせず点灯状態を維持する。Now, when the power is turned on at the time of starting the lamp, the power supply voltage is applied to both ends of the starting device 7, so that the voltage determination circuit 6 is operated via the thermal response switch 3 and the positive temperature coefficient thermistor 5. The thyristor 4 is turned on and the preheating current flows to the filament of the lamp 1. When this preheating current flows for a certain period of time, the thermal response switch 3 is opened, and the preheating current is cut off to generate a pulse voltage from the ballast 2 to start the lamp 1. When the lamp 1 is started, the voltage across the starting device 7 becomes the lamp voltage and decreases, so that the thyristor 4 does not turn on and maintains the lighting state.
【０００５】 ここで、ランプ１が寿命になり、点灯不可能になると、熱応動スイッチ３が開 離してもランプ１は点灯せず、熱応動スイッチ３が再び閉路すると、電圧判別回 路６が働き、サイリスタ４はオンし、再び予熱する。そして、熱応動スイッチ３ が開離してランプ１を始動させようとする。ランプ１が寿命の場合、この動作を 繰り返すが、予熱電流により正特性サーミスタ５が発熱し、高温になるため、正 特性サーミスタ５は数ｋΩの高抵抗となり、予熱電流を減流させ保護状態となる 。Here, when the lamp 1 has reached the end of its life and cannot be lit, the lamp 1 does not illuminate even if the thermal response switch 3 is opened, and when the thermal response switch 3 is closed again, the voltage determination circuit 6 becomes Working, the thyristor 4 turns on and preheats again. Then, the thermal switch 3 is opened to try to start the lamp 1. When the lamp 1 is at the end of its life, this operation is repeated. However, the preheating current causes the PTC thermistor 5 to generate heat and reach a high temperature. Become .
【０００６】[0006]
上記の場合、すなわち、ランプ寿命時、正特性サーミスタ５が動作し、数ｋΩ の高抵抗となっても、電圧判別回路６のインピーダンスが高いため、電圧判別回 路６に印加される正特性サーミスタ５との分圧はほとんど変わらない。従って、 電圧判別回路６には、ほぼ電源電圧が印加されてサイリスタ４はオン状態をし続 け、正特性サーミスタ５は高温状態を維持する。 In the above case, that is, even when the positive temperature coefficient thermistor 5 operates and has a high resistance of several kΩ, the positive voltage characteristic thermistor 5 applied to the voltage voltage determining circuit 6 has a high impedance even if the resistance is several kΩ. The partial pressure of 5 is almost the same. Therefore, the power supply voltage is applied to the voltage determination circuit 6, the thyristor 4 continues to be in the ON state, and the positive temperature coefficient thermistor 5 maintains the high temperature state.
【０００７】 正特性サーミスタ５の温度と抵抗との関係は図４に示すようなものであるが、 ランプ寿命時、正特性サーミスタ５の温度は、数Ωの動作温度を遙に超えて発熱 と放熱がバランスするＡ点となる。 ここで、ランプ１を正常に点灯するランプと交換する場合、正特性サーミスタ ５が動作温度以下の低抵抗にならなければ、再び始動することが不可能であるた め、ランプを外すか、電源を切り、正特性サーミスタ５が放熱し冷却する時間の 数分間、待つ必要があるという問題があった。The relationship between the temperature and the resistance of the positive temperature coefficient thermistor 5 is as shown in FIG. 4, but during the life of the lamp, the temperature of the positive temperature coefficient thermistor 5 far exceeds the operating temperature of several Ω and generates heat. It is point A where heat dissipation is balanced. Here, when replacing the lamp 1 with a lamp that lights up normally, it is not possible to start it again unless the positive temperature coefficient thermistor 5 has a low resistance below the operating temperature. There is a problem that it is necessary to wait for several minutes for the positive temperature coefficient thermistor 5 to dissipate heat and cool it.
【０００８】 本考案は上述の点に鑑みて提供したものであって、寿命になった放電灯を交換 する場合に、直ぐに交換できるようにした放電灯始動装置を提供することを目的 としたものである。The present invention has been made in view of the above points, and an object of the present invention is to provide a discharge lamp starting device which can be replaced immediately when a discharge lamp that has reached the end of its life is replaced. Is.
【０００９】[0009]
本考案は、交流電源に安定器を介して放電灯を接続し、この放電灯のフィラメ ントの非電源側の両端に、遅延機能を持つ熱応動スイッチと、オンすることによ り放電灯のフィラメントに予熱電流を流す半導体スイッチとを接続し、放電灯始 動時に電圧値を検出して上記半導体スイッチをオンさせる電圧判別回路を備え、 放電灯の寿命時に予熱電流が流れ続けることで抵抗値を上昇させて予熱電流を減 少させる正特性サーミスタを設けた放電灯始動装置において、放電灯の寿命時に 正特性サーミスタの温度上昇を制限する制御手段を設けたものである。 According to the present invention, a discharge lamp is connected to an AC power source via a ballast, and a thermal response switch having a delay function is provided at both ends of the filament of the discharge lamp on the non-power source side, and the discharge lamp The filament is connected to a semiconductor switch that supplies a preheating current, and a voltage determination circuit that detects the voltage value when the discharge lamp starts and turns on the semiconductor switch is provided. In the discharge lamp starting device provided with the positive temperature coefficient thermistor for increasing the temperature and decreasing the preheating current, the control means for limiting the temperature increase of the positive temperature coefficient thermistor during the life of the discharge lamp is provided.
【００１０】[0010]
而して、放電灯の寿命時に正特性サーミスタの温度上昇を制限することで、放 電灯の交換時に、放電灯を外す又は電源を切って正特性サーミスタが冷却する時 間が大幅に短縮され、また、放電灯の寿命時に保護に入った直後でも、正特性サ ーミスタの温度が常に動作点近傍にあるため、直ぐに放電灯の交換をすることが でき、更には、放電灯の寿命保護（正特性サーミスタの動作時）時、正特性サー ミスタの温度を低く抑えることができるため、他の部品へのストレスが少なくな り、信頼性を向上させることができる。 Thus, by limiting the temperature rise of the PTC thermistor during the life of the discharge lamp, the time for cooling the PTC thermistor by removing the discharge lamp or turning off the power is greatly shortened when the discharge lamp is replaced. Even after the protection is activated during the life of the discharge lamp, the temperature of the positive temperature coefficient thermistor is always in the vicinity of the operating point, so the discharge lamp can be replaced immediately. During operation of the characteristic thermistor), the temperature of the positive characteristic thermistor can be kept low, so stress to other parts is reduced and reliability can be improved.
【００１１】[0011]
以下、本考案の実施例を図面を参照して説明する。尚、放電灯始動装置の全体 の構成は従来と同じなので、本考案の要旨に部分について詳述する。すなわち、 図１に示すように、電圧判別回路６の両端に、正特性サーミスタ５の動作時の抵 抗値より比較的低抵抗の数百Ω〜数ｋΩの抵抗Ｒ4 を接続したものである。Embodiments of the present invention will be described below with reference to the drawings. Since the entire structure of the discharge lamp starting device is the same as the conventional one, the part will be described in detail in the gist of the present invention. That is, as shown in FIG. 1, a resistor R 4 having a resistance of several hundred Ω to several kΩ, which is relatively lower than the resistance value of the positive temperature coefficient thermistor 5 during operation, is connected to both ends of the voltage determination circuit 6. ..
【００１２】 また、始動における動作も同じなので、ランプ１が寿命になった場合について 説明する。今、正特性サーミスタ５が動作温度（図４参照）を超え数百Ω程度に なると、抵抗Ｒ4 と正特性サーミスタ５の抵抗値の分圧により、電圧判別回路６ の両端電圧が下がり、サイリスタ４はオンすることはできない。 サイリスタ４がオンせず、電流が正特性サーミスタ５に流れなくなると、正特 性サーミスタ５は冷却し、抵抗値が下がるが、電圧判別回路６の分圧が上がり、 再びサイリスタ４がオンし、正特性サーミスタ５の温度が上がり、再びサイリス タ４はオンしなくなる。Since the operation at the time of starting is the same, the case where the lamp 1 reaches the end of its life will be described. Now, when the positive temperature coefficient thermistor 5 exceeds the operating temperature (see FIG. 4) and reaches about several hundred Ω, the voltage across the voltage determination circuit 6 decreases due to the voltage division of the resistance value of the resistor R 4 and the positive temperature coefficient thermistor 5, and the thyristor 4 can not be turned on. When the thyristor 4 does not turn on and the current stops flowing to the positive characteristic thermistor 5, the positive characteristic thermistor 5 cools and the resistance value decreases, but the partial pressure of the voltage discrimination circuit 6 rises and the thyristor 4 turns on again. The temperature of the positive temperature coefficient thermistor 5 rises and the thyristor 4 does not turn on again.
【００１３】 この動作を繰り返し継続し、正特性サーミスタ５の温度は図４に示す動作温度 を少し越えたＢ点付近で安定する。この場合、正特性サーミスタ５の動作温度ま での差が少ないため、ランプ１の交換時、正特性サーミスタ５は冷却し、動作温 度以下になる時間が大幅に短縮されることになり、従来のように数分間も待たず にランプの交換が可能となる。尚、上記抵抗Ｒ4 が制御手段を構成している。By repeating this operation repeatedly, the temperature of the positive temperature coefficient thermistor 5 stabilizes in the vicinity of point B, which is slightly higher than the operating temperature shown in FIG. In this case, since the difference between the operating temperature of the PTC thermistor 5 is small, when the lamp 1 is replaced, the PTC thermistor 5 is cooled, and the time period below the operating temperature is greatly shortened. It is possible to replace the lamp without waiting for a few minutes as in. The resistor R 4 constitutes control means.
【００１４】 （実施例２） 図２は実施例２を示し、本実施例では、抵抗Ｒ5 を抵抗Ｒ3 と並列的に接続す ると共に、正特性サーミスタ５を抵抗Ｒ3 とＲ5 との間に接続したものである。 この実施例においては、ランプ１の寿命時、正特性サーミスタ５の抵抗値が上 がると、抵抗Ｒ3 とＲ5 の抵抗値の分圧により、抵抗Ｒ3 の両端電圧が下がる。 そのため、サイリスタ４のゲートトリガ電圧以下になるため、サイリスタ４はオ ンしない。以下、先の実施例の場合と同様に正特性サーミスタ５の温度は、図４ に示すＢ点付近に安定するため、従来のように数分間も待たずにランプの交換が 可能となる。Second Embodiment FIG. 2 shows a second embodiment. In this embodiment, the resistor R 5 is connected in parallel with the resistor R 3, and the positive temperature coefficient thermistor 5 is connected to the resistors R 3 and R 5 . Is connected between. In this embodiment, if the resistance value of the positive temperature coefficient thermistor 5 increases during the life of the lamp 1, the voltage across the resistance R 3 decreases due to the voltage division of the resistance values of the resistors R 3 and R 5 . Therefore, the voltage becomes lower than the gate trigger voltage of the thyristor 4, and the thyristor 4 does not turn on. Thereafter, as in the case of the previous embodiment, the temperature of the positive temperature coefficient thermistor 5 stabilizes near the point B shown in FIG. 4, so that the lamp can be replaced without waiting for several minutes as in the conventional case.
【００１５】[0015]
本考案は上述のように、交流電源に安定器を介して放電灯を接続し、この放電 灯のフィラメントの非電源側の両端に、遅延機能を持つ熱応動スイッチと、オン することにより放電灯のフィラメントに予熱電流を流す半導体スイッチとを接続 し、放電灯始動時に電圧値を検出して上記半導体スイッチをオンさせる電圧判別 回路を備え、放電灯の寿命時に予熱電流が流れ続けることで抵抗値を上昇させて 予熱電流を減少させる正特性サーミスタを設けた放電灯始動装置において、放電 灯の寿命時に正特性サーミスタの温度上昇を制限する制御手段を設けたものであ るから、放電灯の寿命時に正特性サーミスタの温度上昇を制限することで、放電 灯の交換時に、放電灯を外す又は電源を切って正特性サーミスタが冷却する時間 が大幅に短縮され、また、放電灯の寿命時に保護に入った直後でも、正特性サー ミスタの温度が常に動作点近傍にあるため、直ぐに放電灯の交換をすることがで き、更には、放電灯の寿命保護（正特性サーミスタの動作時）時、正特性サーミ スタの温度を低く抑えることができるため、他の部品へのストレスが少なくなり 、信頼性を向上させることができる効果を奏するものである。 As described above, the present invention connects a discharge lamp to an AC power source through a ballast, and at both ends of the filament of this discharge lamp on the non-power source side, a thermal response switch having a delay function is turned on to turn on the discharge lamp. It is equipped with a voltage discriminator circuit that connects a semiconductor switch that sends a preheating current to the filament, detects the voltage value when the discharge lamp starts, and turns on the semiconductor switch. The discharge lamp starter equipped with a positive temperature coefficient thermistor that increases the temperature of the discharge lamp to reduce the preheating current is equipped with a control means to limit the temperature rise of the positive temperature coefficient thermistor during the life of the discharge lamp. By limiting the temperature rise of the PTC thermistor at times, the time it takes to cool the PTC thermistor by removing the discharge lamp or turning off the power when replacing the discharge lamp is greatly shortened. Even immediately after protection starts during the life of the discharge lamp, the temperature of the positive temperature coefficient thermistor is always near the operating point, so the discharge lamp can be replaced immediately. At this time (when the PTC thermistor is operating), the temperature of the PTC thermistor can be kept low, so that stress on other components is reduced, and the reliability can be improved.
【図面の簡単な説明】[Brief description of drawings]
【図１】本考案の実施例の放電灯始動装置の回路図であ
る。FIG. 1 is a circuit diagram of a discharge lamp starting device according to an embodiment of the present invention.
【図２】同上の実施例２の要部回路図である。FIG. 2 is a circuit diagram of a main part of a second embodiment of the above.
【図３】従来例の放電灯始動装置の回路図である。FIG. 3 is a circuit diagram of a conventional discharge lamp starting device.
【図４】正特性サーミスタの温度と抵抗値との関係を示
す特性図である。FIG. 4 is a characteristic diagram showing a relationship between a temperature and a resistance value of a positive temperature coefficient thermistor.
１ ランプ（放電灯） ２ 安定器 ３ 熱応動スイッチ ４ サイリスタ ５ 正特性サーミスタ ６ 電圧判別回路 1 Lamp (Discharge Lamp) 2 Ballast 3 Thermal Response Switch 4 Thyristor 5 Positive Characteristic Thermistor 6 Voltage Discrimination Circuit
Claims (1)
し、この放電灯のフィラメントの非電源側の両端に、遅
延機能を持つ熱応動スイッチと、オンすることにより放
電灯のフィラメントに予熱電流を流す半導体スイッチと
を接続し、放電灯始動時に電圧値を検出して上記半導体
スイッチをオンさせる電圧判別回路を備え、放電灯の寿
命時に予熱電流が流れ続けることで抵抗値を上昇させて
予熱電流を減少させる正特性サーミスタを設けた放電灯
始動装置において、放電灯の寿命時に正特性サーミスタ
の温度上昇を制限する制御手段を設けたことを特徴とす
る放電灯始動装置。1. A discharge lamp is connected to an AC power source via a ballast, and a thermal response switch having a delay function is provided at both ends of the filament of the discharge lamp on the non-power source side, and a filament of the discharge lamp is turned on by turning on the switch. Equipped with a voltage determination circuit that connects with a semiconductor switch that sends a preheating current, detects the voltage value when the discharge lamp starts and turns on the semiconductor switch, and increases the resistance value by continuing the preheating current during the life of the discharge lamp. In a discharge lamp starting device provided with a positive temperature coefficient thermistor for reducing preheating current, a control means for limiting a temperature rise of the positive temperature coefficient thermistor during the life of the discharge lamp is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3477792U JPH0590894U (en) | 1992-05-26 | 1992-05-26 | Discharge lamp starter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3477792U JPH0590894U (en) | 1992-05-26 | 1992-05-26 | Discharge lamp starter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0590894U true JPH0590894U (en) | 1993-12-10 |
Family
ID=12423727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3477792U Withdrawn JPH0590894U (en) | 1992-05-26 | 1992-05-26 | Discharge lamp starter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0590894U (en) |
-
1992
- 1992-05-26 JP JP3477792U patent/JPH0590894U/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19960801 |