JPH0546260A - Power saving device in which timing is taken - Google Patents

Power saving device in which timing is taken

Info

Publication number
JPH0546260A
JPH0546260A JP4023667A JP2366792A JPH0546260A JP H0546260 A JPH0546260 A JP H0546260A JP 4023667 A JP4023667 A JP 4023667A JP 2366792 A JP2366792 A JP 2366792A JP H0546260 A JPH0546260 A JP H0546260A
Authority
JP
Japan
Prior art keywords
parallel
diode
load
resistors
phase line
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Withdrawn
Application number
JP4023667A
Other languages
Japanese (ja)
Inventor
Horacio Rodrigues Sobrinho
ロドリゲス ソブリーニヨ オラシオ
Antonio Rodrigues Neto
ロドリゲス ネト アントニオ
Renato Rodrigues
ロドリゲス レナート
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of JPH0546260A publication Critical patent/JPH0546260A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B39/00Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04Controlling
    • H05B39/041Controlling the light-intensity of the source
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14Circuit arrangements
    • H05B41/36Controlling
    • H05B41/38Controlling the intensity of light
    • H05B41/40Controlling the intensity of light discontinuously

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Catching Or Destruction (AREA)
  • Finger-Pressure Massage (AREA)
  • Radiation-Therapy Devices (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Cosmetics (AREA)
  • Led Device Packages (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Control Of Voltage And Current In General (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Pyridine Compounds (AREA)

Abstract

PURPOSE: To provide a device which reduces the electric power consumption in inductive or resistive load and more particularly, public illumination systems. CONSTITUTION: This device is composed of an electronic timer 1, a half-wave current rectifier 2 which are connected in parallel with the electronic timer 1 and four pieces of fixed resistors 3 which are coupled in parallel with this half-wave current rectifier (diode) 2 and are selected by a switch 4, all of which are connected to a phase line 5. This phase line 5 is connected in series to certain one piece of electric lamp or one group of the electric lamps existing in parallel with a conductor 7 which is normally neutral or in separate phase. When the timer 1 is off, an electric current flows to the diode 2 and the resistor 3 and activates a save system. The current flows ordinarily to the load 6 by bypassing the diode 2 and the resistors 3.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、総ての種類の電灯、抵
抗性又は容量性負荷に用い、予め定めた時間間隔で、タ
イミングをとって正弦波を整流するとともに電力を減少
することで、該負荷に供給する電流を減少させることに
よって電力をセーブする電子装置(すなわち、デバイ
ス)に関する。
BACKGROUND OF THE INVENTION The present invention is for use with all types of electric lights, resistive or capacitive loads, to timely rectify sine waves and reduce power at predetermined time intervals. , An electronic device (ie, a device) that saves power by reducing the current supplied to the load.

【0002】[0002]

【従来の技術】既に知られているように、電気的及び電
子的装置の技術において、電灯に供給する電流の減少は
サーモスタットによってなされる。それは抵抗を流れる
電流の一部を抵抗で消滅することで光の強さを減少させ
る。これ等のデバイスは幾つかの欠陥をもっている。す
なわち、これ等は電力をセーブせず、熱を発生するとと
もにタイミングをとるいう特徴は有していない。後に、
供給電力を減少させて電灯の光の強さを減少させる制光
装置が開発された。この装置は、その使用が白熱灯にの
み限られ、そして高価でかつタイミングをとるという性
質は有していない。
As is already known, in the art of electrical and electronic equipment, the reduction of the current supplied to the lamp is made by a thermostat. It reduces the intensity of light by extinguishing a part of the current flowing through the resistor. These devices have some deficiencies. That is, they do not save power, generate heat, and do not have the feature of timing. later,
A light control device has been developed that reduces the power supply to reduce the light intensity of the lamp. This device is limited in its use only to incandescent lamps and does not have the property of being expensive and timely.

【0003】[0003]

【発明が解決しようとする課題】本発明は、上記した現
存のシステムが有する欠陥を克服した、総ての種類の電
灯(水銀蒸気灯、白熱灯、蛍光灯、ナトリウム蒸気灯、
多蒸気灯、ハロゲン灯、等)に用いることのできるタイ
ミングをとった電力節約器を提供することを目的とす
る。
SUMMARY OF THE INVENTION The present invention overcomes the deficiencies of the existing systems described above and includes all types of lamps (mercury vapor lamps, incandescent lamps, fluorescent lamps, sodium vapor lamps).
It is an object of the present invention to provide a timely power saver that can be used for multi-steam lamps, halogen lamps, etc.).

【0004】[0004]

【課題を解決するための手段】本発明に係るタイミング
をとった電力節約器は、半波整流ダイオードと並列接続
している電子タイマと、可変抵抗又はスイッチで選択さ
れる並列した複数の固定抵抗とで構成され、かつ、前記
した電子タイマ、可変抵抗又はスイッチで選択される並
列した複数の固定抵抗の総てが、抵抗性負荷又は誘導性
負荷とは直列で、中性位相又は別位相にある導線とは並
列している位相線に接続されることを特徴としている。
SUMMARY OF THE INVENTION A timed power saver according to the present invention comprises an electronic timer connected in parallel with a half-wave rectifier diode and a plurality of parallel fixed resistors selected by variable resistors or switches. And a plurality of parallel fixed resistors selected by the electronic timer, variable resistor or switch described above are connected in series with a resistive load or an inductive load, in a neutral phase or another phase. It is characterized in that a certain conducting wire is connected to a phase line which is in parallel.

【0005】[0005]

【作用】上記した構成によって、本発明のタイミングを
とった電力セーブ装置は総ての種類の電灯、並びに、タ
イミングがプログラムされる得るので、抵抗性及び容量
性負荷に対して用いることができて、電力の減少時間を
予め定めることができる;すなわち、このデバイスはリ
アクタンス及び電灯の寿命を引き延ばすことができ、そ
して1個の電灯又は一群の電灯に接続することができる
とともに、低価格で、電力をセーブすることができそし
て小型である。
With the above arrangement, the timed power saver device of the present invention can be used for resistive and capacitive loads because all types of lights and timing can be programmed. , The power reduction time can be predetermined; that is, the device can prolong the reactance and life of the lamps, and can be connected to one lamp or a group of lamps, and at low cost, Can save and is small.

【0006】[0006]

【実施例】本発明の実施例を図面に基づいて説明する。
図1は、放電灯(水銀蒸気灯、ナトリウム蒸気灯、金属
蒸気灯、等)のためのタイミングがとれるとともに電力
をセーブできるデバイスの電気的な構成を示している。
該デバイスは、電子タイマ1、該電子タイマ1と並列接
続した半波整流器2、及び該半波整流器2と並列に結合
され且つスイッチ4で選択される(0から4の範囲でい
くつでもよい)4個の固定抵抗3とで構成され、そして
前記した総ては位相線5と接続される。該位相線5は、
普通は中性又は別位相にある導線7と並列にある1個の
電灯又は一群の電灯である抵抗性負荷6と直列に接続し
ている。
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows the electrical configuration of a device that is timed and saves power for a discharge lamp (mercury vapor lamp, sodium vapor lamp, metal vapor lamp, etc.).
The device is an electronic timer 1, a half-wave rectifier 2 connected in parallel with the electronic timer 1, and is coupled in parallel with the half-wave rectifier 2 and is selected by a switch 4 (any number in the range 0 to 4). It consists of four fixed resistors 3, and all of the above are connected to the phase line 5. The phase line 5 is
It is connected in series with a resistive load 6 which is usually a lamp or a group of lamps in parallel with a conductor 7 which is in neutral or different phase.

【0007】別の実施例が図2に示されている。図2は
誘導性負荷でのタイミングがとれるとともに電力をセー
ブできるデバイスの電気的な構成を示していて、該デバ
イスは、電子タイマ1、該電子タイマ1と並列接続した
半波整流器2、及び可変抵抗8とで構成され、そして前
記した総ては位相線5に接続される。該位相線5は、中
性又は別位相にある導線7と並列にある誘導性負荷9と
直列に接続している。
Another embodiment is shown in FIG. FIG. 2 shows an electrical configuration of a device capable of timing and load saving in an inductive load, the device including an electronic timer 1, a half-wave rectifier 2 connected in parallel with the electronic timer 1, and a variable And resistor 8 and all of the above are connected to phase line 5. The phase line 5 is connected in series with an inductive load 9 in parallel with a conductor 7 in neutral or another phase.

【0008】上記した構成からなる本発明の電力セーブ
用デバイスの動作は、ダイオード2による半波の除去と
ともに、(スイッチ4を、たとえば、2つだけオンにし
ていれば)2個の固定抵抗3、又は可変抵抗8の作用に
よって動作を続行することに基づくものである。すなわ
ち、ダイオード2に除去される半波は、固定抵抗3又は
可変抵抗8を通って負荷6又は9に供給される。正弦波
が不連続の間は供給電力は減少し、それで抵抗性又は誘
導性負荷の電力も又減少する。
The operation of the power saving device of the present invention having the above-described structure is performed by removing two half-waves by the diode 2 and by using two fixed resistors 3 (if the switch 4 is turned on, for example, only two). , Or that the operation is continued by the action of the variable resistor 8. That is, the half wave removed by the diode 2 is supplied to the load 6 or 9 through the fixed resistor 3 or the variable resistor 8. While the sine wave is discontinuous, the power supply is reduced and so is the power for resistive or inductive loads.

【0009】したがって、50%の時間では電流は抵抗
3又は8に依存して、普通の電流値の1乃至99%の間
にある任意の値に減少する。タイマ1が開放のときは、
電流は前記したダイオード2及び抵抗3又は8を流れ、
そしてセーブ・システムを働かす。タイマ1が接続して
いるときは、電流はダイオード2及び2個の抵抗3又は
8をバイパスして、普通に負荷6又は9を流れる。
Therefore, at 50% of the time, the current is reduced to any value between 1 and 99% of the normal current value, depending on the resistance 3 or 8. When timer 1 is open,
The current flows through the diode 2 and the resistor 3 or 8 described above,
Then activate the save system. When timer 1 is connected, current bypasses diode 2 and two resistors 3 or 8 and normally flows through load 6 or 9.

【0010】使用されるダイオード2は負又は正ダイオ
ードで良い。それ等は平等にミックスして使われ、そし
て供給電力の不均衡を避ける。白熱灯又は混合灯の場合
には、整流された半波を保障する必要はない。したがっ
て、抵抗3又は8は不要となるとともに、残りの構成部
はそのまま維持されることとなる。
The diode 2 used can be a negative or positive diode. They are mixed and used equally and avoid imbalances in power supply. In the case of incandescent or mixed lights, it is not necessary to guarantee a rectified half-wave. Therefore, the resistor 3 or 8 is not necessary, and the remaining components are maintained as they are.

【0011】実際にテストをして、前記セーブ装置を使
用したものと使用しなかったものとを比較した。その結
果、表1に記されている結論が得られた。
Tests were carried out to compare those with and without the save device. As a result, the conclusions shown in Table 1 were obtained.

【表1】 上記した表に示された関係に基づいて、ナトリウム蒸気
放電灯、金属蒸気放電灯、等のような種々の電力の負荷
に対する大きさが類推できる。2個の抵抗3又は抵抗8
の使用によるエネルギー損失は、前記の例では5乃至1
7Wの間にあると評価される。
[Table 1] Based on the relationships shown in the above table, the magnitudes for various electric loads such as sodium vapor discharge lamps, metal vapor discharge lamps, etc. can be inferred. 2 resistors 3 or 8
The energy loss due to the use of
Estimated to be between 7W.

【0012】本発明のデバイスで得られる電力セーブ
は、タイマのプログラミングの関数として可変である。
一例として、そのプログラミングを照明レベルがXで一
日当たり10時間動作する公共用照明システムを選ぶこ
とにすると、その消費は10h.X/day と同等である。若
しセーブ装置が照明の5時間後から負荷を50%に制限
して作用するようにプログラムされるならば、電力セー
ブは 5h.X +5h.1/2X =7 1/2h.X すなわち25%となる。
The power savings obtained with the device of the present invention are variable as a function of timer programming.
As an example, if the programming is to choose a public lighting system that operates at a lighting level of X for 10 hours per day, its consumption is equivalent to 10 h.X / day. If the saver is programmed to operate from 5 hours after lighting with the load limited to 50%, the power save is 5h.X + 5h.1 / 2X = 7 1 / 2h.X or 25%. Becomes

【0013】本発明は、上記したように構成されている
ので、本発明に係るセーブ装置は正弦波半波の除去と固
定抵抗又は可変抵抗の作用による動作の連続性によって
総ての電灯、また抵抗性又は誘導性負荷に使用すること
ができる。さらに該デバイスはタイミングのプログラム
が可能で、電灯の寿命を延長し、1個の電灯又は一群の
電灯に接続することができとともに、電力をセーブで
き、かつ該デバイスの費用は低くそしてサイズは小型で
ある。
Since the present invention is constructed as described above, the save device according to the present invention is capable of removing all half-sine waves and the continuity of operation by the action of a fixed resistance or a variable resistance for all electric lamps, It can be used for resistive or inductive loads. In addition, the device is programmable for timing, prolongs the life of the light and can be connected to a light or a group of lights, saves power, and the cost of the device is low and the size is small. Is.

【図面の簡単な説明】[Brief description of drawings]

【図1】放電灯(水銀蒸気灯、ナトリウム蒸気灯、金属
蒸気灯、等)のためのタイミングのとれるとともに電力
をセーブできるデバイスの電気構成図である。
FIG. 1 is an electrical configuration diagram of a device for a discharge lamp (a mercury vapor lamp, a sodium vapor lamp, a metal vapor lamp, etc.) that can be timed and save power.

【図2】誘導性負荷でのタイミングのとれるとともに電
力をセーブできるデバイスの電気構成図である。
FIG. 2 is an electrical block diagram of a device that can save power while being timed with an inductive load.

【符号の説明】[Explanation of symbols]

1 電子式タイマ 2 半波整流ダイオード 3 固定抵抗 4 スイッチ 5 位相線 6 抵抗性負荷 7 中性又は別位相の導線 8 可変抵抗 9 誘導性負荷 1 Electronic Timer 2 Half-wave Rectifier Diode 3 Fixed Resistor 4 Switch 5 Phase Line 6 Resistive Load 7 Neutral or Another Phase Conductor 8 Variable Resistor 9 Inductive Load

───────────────────────────────────────────────────── フロントページの続き (71)出願人 592032463 レナート ロドリゲス RENATO RODRIGUES ブラジル国 クリチーバ、ルア マテウス レーメ2926 (72)発明者 オラシオ ロドリゲス ソブリーニヨ ブラジル国 クリチーバ、ルア マテウス レーメ2926 (72)発明者 アントニオ ロドリゲス ネト ブラジル国 クリチーバ、ルア マテウス レーメ2926 (72)発明者 レナート ロドリゲス ブラジル国 クリチーバ、ルア マテウス レーメ2926 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 592032463 Renato RODRIGUES Brazil Country Curitiba, Rua Mateus Reme 2926 (72) Inventor Horacio Rodriguez Sobriniyo Brazil Country Curitiba, Rua Mateus Reme 2926 (72) Inventor Antonio Roto Country Curitiba, Rua Mateus Reme 2926 (72) Inventor Renato Rodriguez Brazil Country Curitiba, Rua Mateus Reme 2926

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 半波整流ダイオードと並列接続している
電子タイマと、可変抵抗又はスイッチで選択される並列
した複数の固定抵抗とで構成され、かつ、前記した電子
タイマ、可変抵抗又はスイッチで選択される並列した複
数の固定抵抗の総てが、抵抗性負荷又は誘導性負荷とは
直列に、中性又は別位相にある導線とは並列にある位相
線に接続されることからなるタイミングをとった電力セ
ーブ装置。
1. An electronic timer, which is connected in parallel with a half-wave rectifier diode, and a plurality of fixed resistors in parallel, which are selected by a variable resistor or a switch. All of the selected fixed resistors in parallel are connected in series with a resistive or inductive load and in a phase line in parallel with a conductor in neutral or another phase. Power saving device taken.
【請求項2】 ダイオードが正弦波の半波を除去すると
とともに、該除去された半波は固定抵抗又は可変抵抗の
作用によって動作し続ける請求項1記載のタイミングを
とった電力セーブ装置。
2. The timed power saver of claim 1 wherein the diode removes the sine wave half wave and the removed half wave continues to operate by the action of a fixed or variable resistor.
【請求項3】 白熱灯又は混合灯において固定抵抗又は
可変抵抗を用いる請求項1及び2記載のタイミングをと
った電力セーブ装置。
3. A timed power saver as claimed in claims 1 and 2 in which a fixed or variable resistance is used in the incandescent or mixed light.
JP4023667A 1991-08-09 1992-02-10 Power saving device in which timing is taken Withdrawn JPH0546260A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BR9103451 1991-08-09
BR919103451A BR9103451A (en) 1991-08-09 1991-08-09 TIMED ENERGY SAVER

Publications (1)

Publication Number Publication Date
JPH0546260A true JPH0546260A (en) 1993-02-26

Family

ID=4052544

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4023667A Withdrawn JPH0546260A (en) 1991-08-09 1992-02-10 Power saving device in which timing is taken

Country Status (12)

Country Link
EP (1) EP0536877B1 (en)
JP (1) JPH0546260A (en)
CN (1) CN1072556A (en)
AT (1) ATE147924T1 (en)
AU (1) AU2078392A (en)
BR (1) BR9103451A (en)
CA (1) CA2072825A1 (en)
DE (1) DE69216750T2 (en)
DK (1) DK0536877T3 (en)
ES (1) ES2100295T3 (en)
GR (1) GR3023136T3 (en)
PT (1) PT100080A (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6681110B1 (en) 1999-07-02 2004-01-20 Musco Corporation Means and apparatus for control of remote electrical devices
US7956551B1 (en) 2004-02-24 2011-06-07 Musco Corporation Apparatus and method for discretionary adjustment of lumen output of light sources having lamp lumen depreciation characteristic compensation
US7176635B2 (en) 2004-02-24 2007-02-13 Musco Corporation Apparatus and method for compensating for reduced light output of a light source having a lumen depreciation characteristic over its operational life
US8770796B2 (en) 2004-02-24 2014-07-08 Musco Corporation Energy efficient high intensity lighting fixture and method and system for efficient, effective, and energy saving high intensity lighting
US7956556B1 (en) 2004-02-24 2011-06-07 Musco Corporation Apparatus and method for compensating for reduced light output of a solid-state light source having a lumen depreciation characteristic over its operational life
US7843144B2 (en) 2004-02-24 2010-11-30 Musco Corporation Method and apparatus for retrofitting HID lamps with system to periodically adjust operating wattage
US7982404B2 (en) 2006-12-22 2011-07-19 Musco Corporation Method and apparatus and system for adjusting power to HID lamp to control level of light output and conserve energy (ballast multi-tap power output)
US8288965B1 (en) 2007-02-23 2012-10-16 Musco Corporation Apparatus and method for switching in added capacitance into high-intensity discharge lamp circuit at preset times
WO2009060250A1 (en) * 2007-11-07 2009-05-14 Mariano Penagos Consuegra System and device for controlling the turning on, turning off and consumption of power in lights
US8247990B1 (en) 2008-12-05 2012-08-21 Musco Corporation Apparatus, method, and system for improved switching methods for power adjustments in light sources
CN101949887A (en) * 2010-08-20 2011-01-19 郑州炜盛电子科技有限公司 Semiconductor gas sensor and various gas detection method thereof

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6097599A (en) * 1983-11-02 1985-05-31 アレツクス工業株式会社 Device for dimming discharge lamp
DE3438003A1 (en) * 1984-10-17 1986-04-17 Philips Patentverwaltung Gmbh, 2000 Hamburg Circuit arrangement for the AC operation of gas-discharge lamps

Also Published As

Publication number Publication date
EP0536877A1 (en) 1993-04-14
GR3023136T3 (en) 1997-07-30
ATE147924T1 (en) 1997-02-15
CN1072556A (en) 1993-05-26
DE69216750T2 (en) 1997-06-19
CA2072825A1 (en) 1993-02-10
DE69216750D1 (en) 1997-02-27
DK0536877T3 (en) 1997-07-14
PT100080A (en) 1994-05-31
EP0536877B1 (en) 1997-01-15
BR9103451A (en) 1993-03-09
ES2100295T3 (en) 1997-06-16
AU2078392A (en) 1993-02-11

Similar Documents

Publication Publication Date Title
US4931701A (en) Bi-level ballast circuit for operating HID lamps
WO1999038363A1 (en) Method and apparatus for controlling lights and other devices
JPH0773989A (en) Two level illumination control system
JPH0546260A (en) Power saving device in which timing is taken
JPH0473278B2 (en)
US6856101B1 (en) Method and apparatus for switching of parallel capacitors in an HID bi-level dimming system using voltage suppression
JPH0447957B2 (en)
US5365162A (en) Light bulb electric life extender having a diactriac combination connecter in parallel with a capacitor
CA2047505A1 (en) Lamp ignitor with automatic shut-off feature
US7301291B1 (en) Power controller having current limited RMS regulated output
JPS63284799A (en) Radio frequency lighting system and method of operation of the same
JP4376996B2 (en) DC lighting device for fluorescent lamp
US9497806B2 (en) Power transformation apparatus, illuminating lamp, and lamp tube using the same
CA2211054A1 (en) Fluorescent lamp lighting device
US5013970A (en) Peak voltage reducer circuit for fluorescent lamps
JPH06176880A (en) Lighting circuit of incandescent lamp
JP3070342U (en) Gas discharge lamp
RU2046557C1 (en) Regulated illumination device
JPS631829B2 (en)
JP2607274Y2 (en) Lighting equipment
EP0155099A1 (en) Electric power-saving device for discharge lamps
JPH0676963A (en) Phase control circuit for electronic transformer, lighting circuit and lighting system using these circuits
RU14482U1 (en) POWER SUPPLY OF LUMINESCENT LAMPS WITH BURNED BARS
JPH06335235A (en) High-frequency lighting device for halogen incandescent electric lamp
JP3131719U (en) Light-weight fluorescent lamp that uses a miniature bulb to supply power in the form of pulse direct current

Legal Events

Date Code Title Description
A300 Application deemed to be withdrawn because no request for examination was validly filed

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 19990518