JPS6158960B2 - - Google Patents
Info
- Publication number
- JPS6158960B2 JPS6158960B2 JP8793479A JP8793479A JPS6158960B2 JP S6158960 B2 JPS6158960 B2 JP S6158960B2 JP 8793479 A JP8793479 A JP 8793479A JP 8793479 A JP8793479 A JP 8793479A JP S6158960 B2 JPS6158960 B2 JP S6158960B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- lighting
- metal halide
- power
- halide lamp
- 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
Links
- 229910001507 metal halide Inorganic materials 0.000 claims description 9
- 150000005309 metal halides Chemical class 0.000 claims description 9
- 239000007789 gas Substances 0.000 description 7
- 230000010355 oscillation Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005562 fading Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Description
本発明は音響的共鳴現象の防止対策を施したメ
タルハライドランプの高周波点灯装置に関する。
一般に高圧放電灯を高周波電力により点灯させ
ることにより、次のような種々の長所が生まれる
ことが知られている。
(1) 発光効率が上昇する。これは放電灯内のイオ
ンの再励起エネルギーが高周波で点灯されるこ
とによつて不要となるからである。すなわち、
一旦イオン化された蒸気ガスは、短い時間イオ
ン状態に残留しているが、この時間よりも短い
周期の高周波電力を加えれば、再励起のエネル
ギーは不要となり、このエネルギーは発光にま
わされる。
(2) 安定器を小形、軽量にできる。これは高周波
にすることにより、安定器を構成するチヨーク
コイルあるいはトランス類を小形にできるため
である。
(3) 安定器の電力損失が低減する。これは安定器
が小形化する分だけチヨークコイルやトランス
類の銅損、鉄損等が少なくなるためである。
以上、高周波点灯による長所を揚げたが、これ
ら長所がある反面、次のような問題も生じる。す
なわち、放電灯をある特定の周波数で点灯した場
合、音響的共鳴現象と呼ばれる放電アーク柱のゆ
らぎ等の不安定現象を生じることがある。この共
鳴現象は、ガスを封入した管内の音波が附勢され
る高周波電力の波形と共鳴することによつて生じ
るとされている。この共鳴周波数では、前述の如
く、放電アーク柱がゆらいだり、立ち消えたりす
ることもあり、従つて高周波電力にて点灯させる
場合、この共鳴周波数を避ける必要がある。
本発明の目的は、電源周波数を、音響的共鳴現
象が生じる第1次の共鳴周波数すなわち基本周波
数の特定倍数以上に設定することにより、極めて
安定した点灯状態を得ることができるメタルハラ
イドランプの高周波点灯装置を提供することにあ
る。
以下本発明を図面に示す一実施例を参照して説
明する。ここで、始めに音響的共鳴現象の生じる
共鳴周波数について説明する。音響的共鳴現象
は、理論的には基本共鳴周波数(第1次)と、そ
の整数倍(第2次、第3次)の周波数でとびとび
に表われる。しかし、実際には封入ガスに種々の
金属ガスを含んでいたり、またこのガスを封入す
る管の太さや、電極部を封入する管の複雑な形状
等によつて共鳴周波数はかなり広い周波数帯域を
持つ。また、前述の基本周波数以降の共鳴周波数
は不規則に表われる。
第1図は出力250ワツトのメタルハライドラン
プの共鳴周波数を表わしている。図から明らかな
如く、広い不安定領域を有する。ここで図中、点
模様の部分は軽微な不安定性を表わし、また斜線
模様の部分は激しい不安点特性を表わし、更に網
目模様の部分はアークの立ち消えが生じることを
表わす。またこれらの間にわずかに表われる安定
領域(図中白い部分)は、ランプ個々の個体差
や、内管の形状、ランプの電力等によつて溶易に
不安定な領域になり得る。しかし、図から明らか
なように、ある周波数以上では非常に安定であ
る。この周波数と第1次の基本共鳴周波数との関
係を説明すると次のようになる。すなわち図から
基本共鳴周波数は5.2〜5.8KHzであり、安定な周
波数領域はほぼ80KHz以上であるから、基本共鳴
周波数の13〜14倍以上であれば安定な点灯状態を
得ることができる。
この実験結果を表で示すと次のとおりになる。
The present invention relates to a high-frequency lighting device for a metal halide lamp that takes measures to prevent acoustic resonance phenomena. It is generally known that lighting a high-pressure discharge lamp using high-frequency power brings about the following various advantages. (1) Luminous efficiency increases. This is because the re-excitation energy of the ions in the discharge lamp becomes unnecessary due to the high frequency lighting. That is,
Once ionized, the vapor gas remains in an ionized state for a short period of time, but if high-frequency power with a period shorter than this time is applied, re-excitation energy is no longer required and this energy is used for light emission. (2) The stabilizer can be made smaller and lighter. This is because by using a high frequency, it is possible to downsize the chiyoke coil or transformer that constitutes the ballast. (3) Power loss in the ballast is reduced. This is because the smaller the ballast, the smaller the copper loss, iron loss, etc. of the choke coil and transformers. The advantages of high-frequency lighting have been mentioned above, but while these advantages exist, the following problems also occur. That is, when a discharge lamp is lit at a certain specific frequency, an unstable phenomenon such as fluctuation of the discharge arc column called an acoustic resonance phenomenon may occur. This resonance phenomenon is said to occur when the sound waves inside the gas-filled tube resonate with the waveform of the energized high-frequency power. At this resonant frequency, the discharge arc column may waver or disappear as described above, and therefore, when lighting with high frequency power, it is necessary to avoid this resonant frequency. An object of the present invention is to provide high-frequency lighting of a metal halide lamp that can obtain an extremely stable lighting condition by setting the power supply frequency to a specific multiple of the first resonance frequency, that is, the fundamental frequency, where an acoustic resonance phenomenon occurs. The goal is to provide equipment. The present invention will be described below with reference to an embodiment shown in the drawings. First, the resonance frequency at which the acoustic resonance phenomenon occurs will be explained. Theoretically, the acoustic resonance phenomenon appears at intervals at the fundamental resonance frequency (first order) and frequencies that are integral multiples thereof (second order, third order). However, in reality, the resonant frequency has a fairly wide frequency band due to the fact that the sealed gas contains various metal gases, the thickness of the tube that encloses this gas, the complicated shape of the tube that encloses the electrode part, etc. have Furthermore, the resonant frequencies after the aforementioned fundamental frequency appear irregularly. Figure 1 shows the resonant frequency of a metal halide lamp with an output of 250 watts. As is clear from the figure, there is a wide unstable region. In the figure, dotted areas represent slight instability, diagonal lined areas represent severe unstable point characteristics, and meshed areas represent the occurrence of arc fading. Furthermore, the stable region (white portion in the figure) that appears slightly between these can easily become an unstable region depending on individual differences among the lamps, the shape of the inner tube, the lamp power, etc. However, as is clear from the figure, it is extremely stable above a certain frequency. The relationship between this frequency and the first fundamental resonance frequency is explained as follows. That is, from the figure, the fundamental resonant frequency is 5.2 to 5.8 KHz, and the stable frequency range is approximately 80 KHz or higher, so a stable lighting state can be obtained if the frequency is 13 to 14 times higher than the fundamental resonant frequency. The results of this experiment are shown in the table below.
【表】
この表から明らかなように個々のランプによつ
ては基本的周波数の13倍以上の周波数で安定した
点灯状態が得られるが、封入ガス、このガスを封
入する管などの条件によりランプによつては13倍
の周波数で不安定な点灯状態を示す場合があり、
14倍以上の周波数では全てのランプに安定した点
灯状態が得られる。
第2図はメタルハライドランプの点灯装置を示
し、電源11から供給される直流電力をインバー
ダ回路12により、発振回路13にて決められる
周波数で正弦波の交流電力に逆変換してメタルハ
ライドランプ14に印加し、これを点灯させるも
のである。従つて上記発振回路13の発振周波数
を基本共鳴周波数の14倍以上に設定すれば、安定
な点灯状態を得ることができる。
尚、第2図は発振回路12を別体に持つ他励式
のインバータ回路12を示したがもちろん発振回
路を一体に持つ自励式のインバータ回路を用いて
もよい。また、他の高周波発生装置でもよい。
以上のように本発明によれば、電源の周波数
を、音響的共鳴現象を生じる基本周波数の14倍以
上に設定することにより、高周波電源で点灯させ
るときに問題となる音響的共鳴現象を排除でき、
アークのゆらぎや立ち消えなどのない安定した点
灯状態を得ることができる。[Table] As is clear from this table, depending on the individual lamp, a stable lighting state can be obtained at a frequency of 13 times or more than the basic frequency, but depending on the conditions of the filled gas, the tube that encloses this gas, etc. In some cases, an unstable lighting condition may be displayed at a frequency 13 times higher.
At a frequency of 14 times or more, stable lighting conditions can be obtained for all lamps. FIG. 2 shows a lighting device for a metal halide lamp, in which DC power supplied from a power source 11 is inversely converted into sinusoidal AC power at a frequency determined by an oscillation circuit 13 using an inverter circuit 12 and applied to a metal halide lamp 14. And it lights up. Therefore, by setting the oscillation frequency of the oscillation circuit 13 to 14 times or more the fundamental resonance frequency, a stable lighting state can be obtained. Although FIG. 2 shows a separately excited type inverter circuit 12 having a separate oscillation circuit 12, a self-excited type inverter circuit having an integrated oscillation circuit may of course be used. Also, other high frequency generators may be used. As described above, according to the present invention, by setting the frequency of the power source to 14 times or more the fundamental frequency that causes the acoustic resonance phenomenon, it is possible to eliminate the acoustic resonance phenomenon that becomes a problem when lighting with a high frequency power source. ,
It is possible to obtain a stable lighting condition without arc fluctuation or fading.
第1図は音響共鳴現象の生じる周波数領域を示
す図、第2図は本発明によるメタルハライドラン
プの点灯装置の一実施例を示すブロツク図であ
る。
12……高周波電力を供給するインバータ回
路、13……発振回路、14…メタルハライドラ
ンプ。
FIG. 1 is a diagram showing a frequency range in which an acoustic resonance phenomenon occurs, and FIG. 2 is a block diagram showing an embodiment of a lighting device for a metal halide lamp according to the present invention. 12... Inverter circuit for supplying high frequency power, 13... Oscillator circuit, 14... Metal halide lamp.
Claims (1)
せるものに於いて、このメタルハライドランプに
生じる音響的共鳴現象の第1次の共鳴周波数ほ対
してその14倍以上の周波数で点灯させることを特
徴とするメタルハライドランプの高周波点灯装
置。1. A metal halide lamp that is lit with high-frequency power and is lit at a frequency that is 14 times or more higher than the first resonance frequency of the acoustic resonance phenomenon that occurs in the metal halide lamp. High frequency lighting device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8793479A JPS5611897A (en) | 1979-07-10 | 1979-07-10 | High frequency lighting device for metal halide lamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8793479A JPS5611897A (en) | 1979-07-10 | 1979-07-10 | High frequency lighting device for metal halide lamp |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5611897A JPS5611897A (en) | 1981-02-05 |
JPS6158960B2 true JPS6158960B2 (en) | 1986-12-13 |
Family
ID=13928728
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8793479A Granted JPS5611897A (en) | 1979-07-10 | 1979-07-10 | High frequency lighting device for metal halide lamp |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5611897A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5395257U (en) * | 1976-12-28 | 1978-08-03 | ||
JPS6133091A (en) * | 1984-07-26 | 1986-02-15 | Tokushu Toryo Kk | Method and device for deciding position of flaw on surface |
-
1979
- 1979-07-10 JP JP8793479A patent/JPS5611897A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS5611897A (en) | 1981-02-05 |
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