JP3240398B2 - High frequency fluorescent lamp lighting circuit - Google Patents
High frequency fluorescent lamp lighting circuitInfo
- Publication number
- JP3240398B2 JP3240398B2 JP34120893A JP34120893A JP3240398B2 JP 3240398 B2 JP3240398 B2 JP 3240398B2 JP 34120893 A JP34120893 A JP 34120893A JP 34120893 A JP34120893 A JP 34120893A JP 3240398 B2 JP3240398 B2 JP 3240398B2
- Authority
- JP
- Japan
- Prior art keywords
- fluorescent lamp
- voltage
- lighting circuit
- secondary winding
- filaments
- 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.)
- Expired - Fee Related
Links
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、電流トランスを使用
して蛍光灯に電力を供給する高周波定電流給電に於ける
蛍光灯高周波定電流点灯回路に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp high-frequency constant current lighting circuit for supplying high-frequency constant current to a fluorescent lamp using a current transformer.
【０００２】[0002]
【従来の技術】最近実用化されている高周波点灯専用蛍
光灯に於ては、蛍光灯の点灯回数寿命を最長にするた
め、点灯前にフィラメントを予熱して点灯時確実に熱陰
極放電を起こさせるようにしている。その理由は、フィ
ラメントを予熱することなく放電開始電圧を印加して点
灯させると冷陰極放電が起こり、その際のイオン衝撃に
よりフィラメントに塗布した熱電子放射物質が飛散し、
蛍光灯の寿命を著しく短くするからである。2. Description of the Related Art In a fluorescent lamp exclusively used for high-frequency lighting, which has recently been put into practical use, in order to maximize the life of the fluorescent lamp, the filament is preheated before lighting so that a hot cathode discharge occurs reliably during lighting. I try to make it. The reason is that when the filament is lit by applying a firing voltage without preheating the filament, cold cathode discharge occurs, and thermionic emission material applied to the filament scatters due to ion bombardment at that time,
This is because the life of the fluorescent lamp is significantly shortened.
【０００３】このような点灯条件を満足するために、例
えば、点灯時インバータの出力周波数を２段階に制御す
る点灯方式（実願平４−３５８４９２号「蛍光灯点灯方
式」）が提案されている。しかしながら、この方式によ
れば、同一給電系統内に特性の異なる蛍光灯が混在して
いた場合には個々の蛍光灯に固有の予熱条件があるため
全ての負荷に最適な点灯条件を実現することが困難であ
り、また、球切れ等により蛍光灯を交換した場合には新
たな蛍光灯を点灯するためにインバータを一旦停止させ
て（即ち、全部の蛍光灯を消して）再スタートしなけれ
ばならないという欠点があった。In order to satisfy such a lighting condition, for example, a lighting method has been proposed in which the output frequency of an inverter at the time of lighting is controlled in two stages (Japanese Utility Model Application No. 4-358492, "Fluorescent Lighting Method"). . However, according to this method, when fluorescent lamps with different characteristics are mixed in the same power supply system, each fluorescent lamp has its own preheating condition, so that optimal lighting conditions for all loads can be realized. If the fluorescent lamp is replaced due to a broken bulb or the like, the inverter must be temporarily stopped to turn on the new fluorescent lamp (that is, all the fluorescent lamps are turned off) and restarted. There was a disadvantage that it did not.
【０００４】[0004]
【発明が解決しようとする課題】この発明の目的は、上
記従来方式の欠点を改良することであり、高周波定電流
給電方式に於て蛍光灯の放電開始時に確実に熱陰極放電
を行なわせるために、個々の蛍光灯の特性に最適な点灯
条件を実現することができる蛍光灯高周波定電流点灯回
路を提供することである。SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned drawbacks of the conventional system, and to perform a hot cathode discharge reliably at the start of discharge of a fluorescent lamp in a high-frequency constant current power supply system. Another object of the present invention is to provide a fluorescent lamp high-frequency constant current lighting circuit capable of realizing lighting conditions optimal for the characteristics of individual fluorescent lamps.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成するた
め、この発明の蛍光灯高周波定電流点灯回路は、高周波
定電流を供給する一次巻線を備えた電流トランスの二次
巻線に第１および第２のタップを設け、蛍光灯の２つの
フィラメントのそれぞれ一方の端子を前記二次巻線の両
端子に接続し、前記２つのフィラメントのそれぞれ他方
の端子をそれぞれＰＴＣサーミスタを介して前記二次巻
線の第１および第２のタップに接続するとともに前記他
方の端子間にコンデンサを接続している。In order to achieve the above-mentioned object, a fluorescent lamp high-frequency constant current lighting circuit according to the present invention includes a secondary winding of a current transformer having a primary winding for supplying a high-frequency constant current. First and second taps are provided, one terminal of each of two filaments of the fluorescent lamp is connected to both terminals of the secondary winding, and the other terminal of each of the two filaments is connected to the respective terminal via a PTC thermistor. The capacitor is connected to the first and second taps of the secondary winding and a capacitor is connected between the other terminals.
【０００６】[0006]
【作用】インバータ起動時、２つのＰＴＣサーミスタは
室温でその抵抗値は十分に低いため、これらＰＴＣサー
ミスタを通して２つのフィラメントにそれぞれ大きな予
熱電流が流れ、ＰＴＣサーミスタの自己発熱により短時
間後その温度がキュリー点以上に上がると抵抗値が急激
に増加して２つのフィラメント間に放電開始電圧より高
い電圧が印加され、予熱されたフィラメントから熱電子
が飛び出して熱陰極放電を開始する。When the inverter is started, the resistance of the two PTC thermistors is sufficiently low at room temperature. Therefore, a large preheating current flows through each of the two filaments through the PTC thermistors, and the temperatures of the two PTC thermistors are shortly increased due to self-heating of the PTC thermistors. When the temperature rises above the Curie point, the resistance value sharply increases, a voltage higher than the discharge starting voltage is applied between the two filaments, and thermoelectrons jump out of the preheated filament to start hot cathode discharge.
【０００７】[0007]
【実施例】この発明の実施例について図面を参照しなが
ら説明する。図１はその全体の回路図、図２はＰＴＣサ
ーミスタの温度−抵抗特性図、また、図３は各部の電圧
電流波形を示す動作説明図である。１０Ａ、６５kＨzの
高周波定電流を出力するインバータ１にループ状の給電
線２が接続され、この給電線２が電流トランス３を貫通
し（即ち、１ターンの一次巻線として巻回され）てい
る。電流トランス３には二次巻線４が２４ターン巻回さ
れ、その両端子４ａ、４ｄからそれぞれ４ターンのとこ
ろに第１および第２のタップ４ｂ、４ｃが設けられてい
る。蛍光灯５の２つのフィラメントのそれぞれ一方の端
子が電流トランス３の二次巻線の両端子４ａ、４ｄに接
続され、また、フィラメントの他方の端子がそれぞれＰ
ＴＣサーミスタＴ1、Ｔ2を介して二次巻線の第１および
第２のタップ４ｂ、４ｃに接続されている。Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall circuit diagram, FIG. 2 is a temperature-resistance characteristic diagram of a PTC thermistor, and FIG. 3 is an operation explanatory diagram showing voltage-current waveforms of various parts. A loop-shaped power supply line 2 is connected to an inverter 1 that outputs a high-frequency constant current of 10 A and 65 kHz, and the power supply line 2 passes through the current transformer 3 (that is, is wound as a one-turn primary winding). . A secondary winding 4 is wound around the current transformer 3 for 24 turns, and first and second taps 4b and 4c are provided at four turns from both terminals 4a and 4d, respectively. One terminal of each of the two filaments of the fluorescent lamp 5 is connected to both terminals 4a and 4d of the secondary winding of the current transformer 3, and the other terminal of each of the filaments is connected to P
It is connected to the first and second taps 4b and 4c of the secondary winding via the TC thermistors T 1 and T 2 .
【０００８】蛍光灯５の２つのフィラメントにそれぞれ
並列に０.１μＦのコンデンサＣ1、Ｃ3が、また、蛍光
灯５と並列に０.００２７μＦのコンデンサＣ2がそれぞ
れ接続され、これにより、フィラメントが断線したり蛍
光灯５を外したりしたとき、二次巻線４の端子に放電に
必要な電圧以上の異常な高電圧が発生するのを防止して
いる。蛍光灯５は定格４５Ｗで、放電時の定格電圧およ
び定格電流はそれぞれ１０７Ｖおよび０.４２Ａ、ま
た、放電開始電圧は２００〜２５０Ｖ程度である。ＰＣ
ＴサーミスタＴ1、Ｔ2は正の温度係数をもつ感熱抵抗素
子であり、図２に示されるように、その温度がキュリー
点である５０℃以下であるときは抵抗値が１２Ωである
が、キュリー点を超えると抵抗値が急激に増加し９０℃
で１.２kΩとなる特性を有している。The two filaments of the fluorescent lamp 5 are connected in parallel with 0.1 μF capacitors C 1 and C 3 , respectively, and in parallel with the fluorescent lamp 5, are connected with a 0.0027 μF capacitor C 2. This prevents an abnormally high voltage higher than the voltage required for discharge from being generated at the terminal of the secondary winding 4 when the lamp is disconnected or the fluorescent lamp 5 is removed. The fluorescent lamp 5 has a rating of 45 W, a rated voltage and a rated current at the time of discharge of 107 V and 0.42 A, respectively, and a discharge starting voltage of about 200 to 250 V. PC
T thermistors T 1 and T 2 are thermosensitive resistance elements having a positive temperature coefficient. As shown in FIG. 2, when the temperature is below the Curie point of 50 ° C., the resistance is 12Ω. Exceeding the Curie point, the resistance increases rapidly and reaches 90 ° C
Has a characteristic of 1.2 kΩ.
【０００９】次に、図３を参照しながらその動作につい
て説明する。同図に於て、は予熱時、は放電開始
時、は点灯時、は断線時、また、は蛍光灯を交換
した後の点灯時の状態をそれぞれ示したものである。イ
ンバータ１を起動して給電線２に１０Ａ、６５kＨzの高
周波定電流を流すと、最初２つのＰＴＣサーミスタ
Ｔ1、Ｔ2は室温にあってその抵抗値は十分に低いため、
これらを通して二次巻線４の（４＋４）ターンの部分か
ら蛍光灯５の２つのフィラメントに１０Ａ／（４＋４）
＝１.２５Ａの電流がそれぞれ流れ、この電流により２
つのフィラメントは予熱される。各フィラメントの抵抗
を２Ωとすると、この時の端子４ａ、タップ４ｂ間の電
圧（＝タップ４ｃ、端子４ｄ間の電圧）は１.２５Ａ×
（１２Ω＋２Ω）＝１７.５Ｖであり、タップ４ｂ、４
ｃ間の電圧は巻線比で１７.５Ｖ×１６／４＝７０Ｖ、
従って蛍光灯５の両フィラメント間に印加される電圧は
１７.５Ｖ×２＋７０Ｖ＝１０５Ｖで放電開始電圧より
低いから放電しない。Next, the operation will be described with reference to FIG. In the figure, indicates the state at the time of preheating, at the start of discharge, at the time of lighting, at the time of disconnection, and at the time of lighting after replacing the fluorescent lamp. When the inverter 1 is activated and a high-frequency constant current of 10 A and 65 kHz flows through the power supply line 2, the two PTC thermistors T 1 and T 2 are initially at room temperature and their resistance values are sufficiently low.
Through these, 10 A / (4 + 4) from the (4 + 4) turn portion of the secondary winding 4 to the two filaments of the fluorescent lamp 5
= 1.25 A of current flows, and this current causes 2
One filament is preheated. Assuming that the resistance of each filament is 2Ω, the voltage between the terminal 4a and the tap 4b (= the voltage between the tap 4c and the terminal 4d) at this time is 1.25 A ×
(12Ω + 2Ω) = 17.5V, taps 4b, 4
The voltage between c is 17.5V × 16/4 = 70V in terms of the winding ratio,
Therefore, the voltage applied between both filaments of the fluorescent lamp 5 is 17.5 V × 2 + 70 V = 105 V, which is lower than the discharge starting voltage, so that no discharge occurs.
【００１０】フィラメントが予熱されるのと同時にＰＴ
ＣサーミスタＴ1、Ｔ2は自己発熱により徐々に温度が上
昇し（室温等の条件により異なるが）１〜２秒後にキュ
リー点以上になると抵抗値が急激に増加し、すると二次
巻線４の全体の２４ターンからコンデンサＣ2に１０Ａ
／２４＝０.４２Ａの電流が流れる。コンデンサＣ2の６
５kＨzに於ける抵抗は９０７Ωであるからその端子電圧
は３７８Ｖまで上昇しようとし、これが蛍光灯５の両フ
ィラメント間に印加される。蛍光灯５の放電開始電圧は
２００〜２５０Ｖ程度であるから、コンデンサＣ2の端
子電圧が上昇する過程で、既に予熱されているフィラメ
ントから熱電子が放出され熱陰極放電を開始し、蛍光灯
５の定格放電電圧（１０７Ｖ）で安定する。At the same time as the filament is preheated, PT
The temperature of the C thermistors T 1 and T 2 gradually rises due to self-heating (depending on conditions such as room temperature). When the temperature exceeds the Curie point after 1-2 seconds, the resistance value sharply increases. 10A from the entire 24 turn to the capacitor C 2 of
A current of /24=0.42 A flows. 6 of capacitor C 2
Since the resistance at 5 kHz is 907Ω, the terminal voltage tends to rise to 378 V, which is applied between both filaments of the fluorescent lamp 5. Since the discharge starting voltage of the fluorescent lamp 5 is about 200～250V, in the process of the terminal voltage of the capacitor C 2 rises, thermal electrons are emitted from the filament which has already been preheated to start the hot cathode discharge fluorescent lamp 5 At the rated discharge voltage (107 V).
【００１１】蛍光灯５のフィラメントが断線した場合ま
たは給電線２に電流を流した状態で交換のために蛍光灯
５を外した場合、フィラメントに並列に接続した０.１
μＦのコンデンサＣ1、Ｃ3を通してＰＣＴサーミスタＴ
1、Ｔ2に電流が流れキュリー点以上の温度に維持される
からＰＣＴサーミスタＴ1、Ｔ2は高抵抗のままであり、
新たな蛍光灯５を接続するとそのフィラメント間に放電
開始電圧より高いコンデンサＣ2の端子電圧３７８Ｖが
印加され、蛍光灯５は直ちに冷陰極放電を開始する。冷
陰極放電による点灯が行われるのは交換時の１回だけで
あるから、蛍光灯５の寿命には実質的な影響はない。When the filament of the fluorescent lamp 5 is broken or when the fluorescent lamp 5 is removed for replacement while the current is supplied to the power supply line 2, the 0.1 connected in parallel with the filament is used.
PCT thermistor T through μF capacitors C 1 and C 3
1, PCT thermistor T 1, T 2 from T 2 to the current is maintained above the Curie point flow temperature remains high resistance,
New fluorescent lamp 5 the connecting terminal voltage 378V higher than the discharge start voltage capacitor C 2 between the filament is applied, the fluorescent lamp 5 is started immediately cold cathode discharge. Lighting by cold-cathode discharge is performed only once at the time of replacement, so that the life of the fluorescent lamp 5 is not substantially affected.
【００１２】なお、給電線に流す高周波定電流の周波
数、電流値、電流トランスの二次巻線の巻数、第１およ
び第２のタップを設ける位置、ＰＴＣサーミスタの規
格、各コンデンサの値等は、上記実施例に限られるもの
ではなく、蛍光灯の定格その他の条件に応じて適宜設計
変更することができる。The frequency, current value, number of turns of the secondary winding of the current transformer, the positions where the first and second taps are provided, the standard of the PTC thermistor, the value of each capacitor, etc. are as follows. However, the present invention is not limited to the above embodiment, and the design can be changed as appropriate in accordance with the rating and other conditions of the fluorescent lamp.
【００１３】[0013]
【発明の効果】以上説明したとおり、この発明の蛍光灯
高周波定電流点灯回路は、従来装置のように始動時イン
バータに特殊な制御を行う必要がなく、１本の蛍光灯だ
けを交換する際もインバータを停止、再始動する必要が
なく、個々の蛍光灯の特性に応じて最適の点灯条件を実
現することができ、これにより同一給電系統内に特性の
異なる蛍光灯を混在させることができ、インバータ出力
の始動時電力を最小とすることができ、また、環境温度
により予熱時間が自動的に調節されるから特に低温環境
に於ける始動特性が改善され、蛍光灯の寿命を著しく長
くすることができるという数々の作用効果を奏するもの
である。As described above, the fluorescent lamp high-frequency constant current lighting circuit according to the present invention does not require special control of the inverter at the time of starting unlike the prior art device, and is used when only one fluorescent lamp is replaced. There is no need to stop and restart the inverter, and it is possible to realize the optimal lighting conditions according to the characteristics of each fluorescent lamp, thereby enabling fluorescent lamps with different characteristics to coexist in the same power supply system. In addition, the starting power of the inverter output can be minimized, and the preheating time is automatically adjusted according to the environmental temperature, so that the starting characteristics especially in a low temperature environment are improved, and the life of the fluorescent lamp is significantly prolonged. It has many effects.
【図１】この発明の実施例の全体図FIG. 1 is an overall view of an embodiment of the present invention.
【図２】そのＰＴＣサーミスタの温度−抵抗特性図FIG. 2 is a temperature-resistance characteristic diagram of the PTC thermistor.
【図３】その各部の電圧電流波形を示す動作説明図FIG. 3 is an operation explanatory diagram showing voltage and current waveforms of respective parts.
１ インバータ ２ 給電線 ３
電流トランス ４ 二次巻線 ４ａ、４ｄ 端子 ４ｂ 第１のタップ ４ｃ 第２のタップ ５
蛍光灯 Ｃ1、Ｃ2、Ｃ3 コンデンサ Ｔ1、Ｔ
2 ＰＣＴサーミスタ1 Inverter 2 Feed line 3
Current transformer 4 Secondary winding 4a, 4d Terminal 4b First tap 4c Second tap 5
Fluorescent lamp C 1, C 2, C 3 capacitor T 1, T
2 PCT thermistor
フロントページの続き (56)参考文献 特開 昭59−111297（ＪＰ，Ａ) 特開 平３−93193（ＪＰ，Ａ) 実開 平２−137798（ＪＰ，Ｕ) 実開 平４−81497（ＪＰ，Ｕ) 実公 昭64−5360（ＪＰ，Ｙ２)Continuation of the front page (56) References JP-A-59-111297 (JP, A) JP-A-3-93193 (JP, A) JP-A-2-137798 (JP, U) JP-A-4-81497 (JP , U) Jiko 64-5360 (JP, Y2)
Claims (1)
た電流トランスの二次巻線に第１および第２のタップを
設け、蛍光灯の２つのフィラメントのそれぞれ一方の端
子を前記二次巻線の両端子に接続し、前記２つのフィラ
メントのそれぞれ他方の端子をそれぞれＰＴＣサーミス
タを介して前記二次巻線の第１および第２のタップに接
続するとともに前記他方の端子間にコンデンサを接続し
たことを特徴とする蛍光灯高周波定電流点灯回路。1. A secondary winding of a current transformer having a primary winding for supplying a high-frequency constant current is provided with first and second taps, and one terminal of each of two filaments of a fluorescent lamp is connected to the secondary winding. Connected to both terminals of a winding, the other terminals of the two filaments are respectively connected to first and second taps of the secondary winding via PTC thermistors, and a capacitor is connected between the other terminals. A fluorescent lamp high-frequency constant current lighting circuit characterized by being connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34120893A JP3240398B2 (en) | 1993-12-13 | 1993-12-13 | High frequency fluorescent lamp lighting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34120893A JP3240398B2 (en) | 1993-12-13 | 1993-12-13 | High frequency fluorescent lamp lighting circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07161482A JPH07161482A (en) | 1995-06-23 |
| JP3240398B2 true JP3240398B2 (en) | 2001-12-17 |
Family
ID=18344219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34120893A Expired - Fee Related JP3240398B2 (en) | 1993-12-13 | 1993-12-13 | High frequency fluorescent lamp lighting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3240398B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5150973B2 (en) * | 2008-04-01 | 2013-02-27 | Ｎｅｃライティング株式会社 | Fluorescent lamp |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59111297A (en) * | 1982-12-16 | 1984-06-27 | 岩崎電気株式会社 | Device for firing discharge lamp |
| JPS645360U (en) * | 1987-06-30 | 1989-01-12 | ||
| JPH02137798U (en) * | 1989-04-21 | 1990-11-16 | ||
| JPH0481497U (en) * | 1990-11-28 | 1992-07-15 |
-
1993
- 1993-12-13 JP JP34120893A patent/JP3240398B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07161482A (en) | 1995-06-23 |
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