JPH03246893A - Lighting device for discharge lamp - Google Patents

Lighting device for discharge lamp

Info

Publication number
JPH03246893A
JPH03246893A JP2044777A JP4477790A JPH03246893A JP H03246893 A JPH03246893 A JP H03246893A JP 2044777 A JP2044777 A JP 2044777A JP 4477790 A JP4477790 A JP 4477790A JP H03246893 A JPH03246893 A JP H03246893A
Authority
JP
Japan
Prior art keywords
discharge lamp
output
inverter
voltage
lighting
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.)
Pending
Application number
JP2044777A
Other languages
Japanese (ja)
Inventor
Hiroyoshi Yamazaki
山崎 広義
Yoshitaka Igarashi
芳貴 五十嵐
Hajime Ii
井伊 肇
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.)
Mitsubishi Electric Corp
Mitsubishi Electric Lighting Corp
Original Assignee
Mitsubishi Electric Corp
Mitsubishi Electric Lighting Corp
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 Mitsubishi Electric Corp, Mitsubishi Electric Lighting Corp filed Critical Mitsubishi Electric Corp
Priority to JP2044777A priority Critical patent/JPH03246893A/en
Publication of JPH03246893A publication Critical patent/JPH03246893A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
  • Protection Of Static Devices (AREA)
  • Inverter Devices (AREA)

Abstract

PURPOSE:To prevent the abnormal lighting occurring at the final stage of the life of a discharge lamp by providing a means limiting the power fed from an inverter to the discharge lamp, a detecting means detecting the abnormal lighting of the discharge lamp and a means turning on the power limiting means in response to the output of the detecting means. CONSTITUTION:When abnormal lighting occurs at the final stage of the life of a discharge lamp 3, the voltage of the discharge lamp 3 rises abnormally. This voltage rise is inputted to a voltage comparator 93 via a voltage divider consisting of resistors 91, 92 and compared with the preset reference voltage and detected, and the detected output is fed to an analog switch 53 to close it. The output of an oscillator 7 is fed to a counter 51, the output of an inverter 2 is set to an intermittent output from a continuous output, the power fed to the discharge lamp 3 is limited, thus the heating of the discharge lamp 3 is suppressed, and the current flowing in switching devices 21, 22 of the inverter 2 is decreased. Even if the abnormal lighting of the discharge lamp 3 occurs, an increase of the stress of the switching devices 21, 22 of the inverter 2 of a lighting device is prevented, and breakage can be prevented.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、放電灯を高周波で点灯する点灯装置に関す
るものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lighting device for lighting a discharge lamp at high frequency.

〔従来の技術〕[Conventional technology]

インバータより放電灯に高周波電力を供給し放電灯を点
灯するとともに、放電灯への供給電力を制御して放電灯
の調光を行うようにした装置としては、実開昭64−4
4600号公報に開示されたものなどが知られている。
Utility Model No. 64-4 is a device that supplies high-frequency power to a discharge lamp from an inverter to light the discharge lamp, and controls the power supplied to the discharge lamp to dim the discharge lamp.
The one disclosed in Japanese Patent No. 4600 is known.

第8図はこの従来例の回路図であり、第9図はその動作
説明図である。第8図において、1は直流電源、2はイ
ンバータ、3は放電灯、1oは非安定マルチバイブレー
タ、IC2は電圧比較器、VRは基準電圧をつくる可変
抵抗である。
FIG. 8 is a circuit diagram of this conventional example, and FIG. 9 is an explanatory diagram of its operation. In FIG. 8, 1 is a DC power supply, 2 is an inverter, 3 is a discharge lamp, 1o is an unstable multivibrator, IC2 is a voltage comparator, and VR is a variable resistor for creating a reference voltage.

この構成により、インバータ2は、第9図に示すように
、発振動作と発振停止を縁り返し調光が行われる。この
発振動作の期間はT。0であり、発振・停止の繰り返し
周期はTである。調光の深さは、可変抵抗VRによりT
。、/T(以下デユーティ比という)を変えて、変える
ことができる。
With this configuration, as shown in FIG. 9, the inverter 2 performs dimming by alternating between oscillation operation and oscillation stop. The period of this oscillation operation is T. 0, and the repetition period of oscillation and stopping is T. The depth of dimming is controlled by the variable resistor VR.
. , /T (hereinafter referred to as duty ratio).

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

ところで、この種高周波点灯の放電灯では、寿命末期な
どに放電灯の電圧が異常に上昇して、発熱が異常に増大
することがある。商用周波数で点灯の場合、放電灯の電
圧が異常に上昇すると通常点灯不能となり特に問題はな
いが、高周波点灯の場合、点灯不能とはならず、放電灯
の発熱により点灯装置のインバータにおけるスイッチン
グデバイスはストレス(過負荷)が増大し、破損するこ
とがある。
By the way, in this kind of high-frequency lighting discharge lamp, the voltage of the discharge lamp may rise abnormally at the end of its life, and the heat generation may abnormally increase. When lighting at a commercial frequency, if the voltage of the discharge lamp rises abnormally, it will normally become impossible to light and there is no particular problem. However, when lighting at high frequency, it will not become impossible to light, and the switching device in the inverter of the lighting device will be damaged due to the heat generated by the discharge lamp. may be damaged due to increased stress (overload).

この発明は、このような問題を解消するためになされた
ものて、放電灯の寿命末期などに起きる放電灯の点灯異
常により破損することのない、高周波点灯の放電灯点灯
装置を提供することを目的とするものである。
The present invention has been made to solve these problems, and it is an object of the present invention to provide a high-frequency lighting discharge lamp lighting device that will not be damaged due to lighting abnormalities of the discharge lamp that occur at the end of its life. This is the purpose.

〔課題を解決するための手段〕[Means to solve the problem]

前記目的を達成するため、この発明では、放電灯点灯装
置を次の(1)のとおりに構成する。
In order to achieve the above object, in the present invention, a discharge lamp lighting device is configured as follows (1).

(1)高周波電力を放電灯に供給するインバータと、該
インバータから前記放電灯に供給する電力を制限する電
力制限手段と、前記放電灯の点灯異常を検知する異常検
知手段と、該異常検知手段の出力に応じて前記電力制限
手段を投入する投入手段とを備えた放電灯点灯装置。
(1) An inverter that supplies high-frequency power to the discharge lamp, a power limiting means that limits the power supplied from the inverter to the discharge lamp, an abnormality detection means that detects a lighting abnormality of the discharge lamp, and the abnormality detection means and input means for inputting the power limiting means according to the output of the discharge lamp lighting device.

〔作用〕[Effect]

前記(1)の構成により、放電灯の点灯異常の際、イン
バータから放電灯に供給される電力は制限される。
With the configuration (1) above, when the discharge lamp is lit abnormally, the power supplied from the inverter to the discharge lamp is limited.

〔実施例〕〔Example〕

以下この発明を実施例に基ついて詳しく説明する。第1
図はこの発明の第1実施例である“放電灯調光装置”の
ブロック図である。図において、1は直流電源、2は直
流電源1の電力を20KH2以上の高周波電力に変換す
るインバータ、21゜22はインバータのスイッチング
デバイス、23.24はタイオート、25はコイル(安
定器)、26.27はコンデンサ、3は放電灯である。
The present invention will be explained in detail below based on examples. 1st
The figure is a block diagram of a "discharge lamp dimming device" which is a first embodiment of the present invention. In the figure, 1 is a DC power supply, 2 is an inverter that converts the power of the DC power supply 1 into high frequency power of 20KH2 or more, 21° 22 is a switching device of the inverter, 23 and 24 are tie autos, 25 is a coil (ballast), 26 and 27 are capacitors, and 3 is a discharge lamp.

4は放電灯への電力供給を制御する制御回路である。5
は電力の供給期間と停止期間とを所定の比率て制御する
信号を発生するデユーティ比制御回路であり、発振回路
の出力信号を分周するカウンタ51、停止期間を定める
ための時間を発生する時限回路52.アナログスイッチ
53で構成される。7は発振回路である。、6はスイッ
チングデバイス21,22の駆動回路てあり、フリップ
フロップ回路61.アンド回路62,63、ドライバ6
4.65から構成される。8は調光スイッチである。9
は異常検知回路で、放電灯3の電圧を分圧する抵抗91
.92と電圧比較器93で構成される。なお、コンデン
サ27はインバータ2の一部を構成する大容量のコンデ
ンサであり、コンデンサ26は始動時にコイル25と直
列共振回路を構成するフィラメント回路の共振コンデン
サである。
4 is a control circuit that controls power supply to the discharge lamp. 5
is a duty ratio control circuit that generates a signal to control the power supply period and the stop period at a predetermined ratio, a counter 51 that divides the frequency of the output signal of the oscillation circuit, and a timer that generates a time for determining the stop period. Circuit 52. It is composed of an analog switch 53. 7 is an oscillation circuit. , 6 are drive circuits for the switching devices 21 and 22, and flip-flop circuits 61 . AND circuits 62, 63, driver 6
Consists of 4.65. 8 is a dimmer switch. 9
is an abnormality detection circuit, which includes a resistor 91 that divides the voltage of the discharge lamp 3.
.. 92 and a voltage comparator 93. Note that the capacitor 27 is a large-capacity capacitor that constitutes a part of the inverter 2, and the capacitor 26 is a resonant capacitor of a filament circuit that constitutes a series resonant circuit with the coil 25 at the time of starting.

また、第2図は本実施例の動作説明図であり、(イ)は
全光状態のインバータ出力周波数f1と放電灯電流振幅
A、を表し、(ロ)は同じく調光状態、(ハ)はデユー
ティ比制御回路5の出力信号であり、Tはデユーティ比
制御回路5の周期を示す。
Moreover, FIG. 2 is an explanatory diagram of the operation of this embodiment, in which (a) represents the inverter output frequency f1 and discharge lamp current amplitude A in the full light state, (b) also represents the dimming state, and (c) is the output signal of the duty ratio control circuit 5, and T indicates the period of the duty ratio control circuit 5.

次に動作について説明する。Next, the operation will be explained.

まず調光スイッチ8が開いているとする。発振回路7は
、周波数f1の高周波を発生し、この高周波はフリップ
フロップ回路61により矩形波に変換され、アンド回路
62.63を介してドライバ64.65に供給される。
First, assume that the dimmer switch 8 is open. The oscillation circuit 7 generates a high frequency wave of frequency f1, and this high frequency wave is converted into a rectangular wave by the flip-flop circuit 61 and supplied to the driver 64.65 via the AND circuit 62.63.

ドライバ64.65の出力により、インバータ2のスイ
ッチングデバイス21.22は交互にオン/オフし、直
流電源1の直流電力は、周波数f1の高周波電力に変換
され、安定器であるコイル25を介して放電灯3に供給
され、放電灯3は全光状態で点灯する。放電灯3の電流
はコイル25により所定値に設定されている。
The switching devices 21, 22 of the inverter 2 are turned on and off alternately by the output of the driver 64, 65, and the DC power of the DC power supply 1 is converted to high frequency power of frequency f1, and is then transmitted through the coil 25, which is a ballast. The light is supplied to the discharge lamp 3, and the discharge lamp 3 lights up in a full light state. The current of the discharge lamp 3 is set to a predetermined value by a coil 25.

次に、調光スイッチ8を投入すると、発振回路7の出力
が、チューティ比制御回路5のカウンタ51て分周され
、その分周波の立下り点即ち第2図(ハ)の8点で時限
回路52が動作を開始して、チューティ比制御回路5は
時限回路52の動作中T2なる期間出力信号がLレベル
となり、フリップフロップ61の出力かアント回路62
゜63で阻止され、駆動回路6は動作を停止する。
Next, when the dimmer switch 8 is turned on, the output of the oscillation circuit 7 is frequency-divided by the counter 51 of the tute ratio control circuit 5, and a timer is set at the falling point of the frequency division, that is, the 8 points in FIG. 2 (c). When the circuit 52 starts operating, the output signal of the tuteity ratio control circuit 5 becomes L level for a period T2 during the operation of the timer circuit 52, and the output signal of the flip-flop 61 or the ant circuit 62 becomes low.
63, and the drive circuit 6 stops operating.

よってインバータ2の出力が停止し、デユーティ比がT
/TよりT、/Tにか減少する。時限回路52の動作が
完了すると、デユーティ比制御回路5の出力はハイレベ
ルとなり駆動回路6は動作を再開し、インバータ2の出
力が開始される。
Therefore, the output of inverter 2 is stopped and the duty ratio becomes T.
It decreases from /T to T, /T. When the operation of the timer circuit 52 is completed, the output of the duty ratio control circuit 5 becomes high level, the drive circuit 6 resumes operation, and the output of the inverter 2 is started.

以後この動作を縁り返し、放電灯3には第2図(ロ)に
示す電流が流れ、デユーティ比の減少により放電灯3へ
の供給電力が減少するのて、光量か減少する。
Thereafter, this operation is repeated, and the current shown in FIG. 2 (b) flows through the discharge lamp 3, and as the duty ratio decreases, the power supplied to the discharge lamp 3 decreases, and the amount of light decreases.

このようにして、調光が行われる。In this way, dimming is performed.

次に、調光スイッチ8か開いている、全光状態で、点灯
異常が発生した場合について説明する。
Next, a case will be described in which a lighting abnormality occurs in a full-light state with the dimmer switch 8 open.

放電灯3の寿命末期などで点灯異常が起きると、放電灯
3の電圧が異常に上昇する。この電圧上昇は抵抗91.
92からなる分圧器を介して電圧比較器93に人力され
、所定の基準電圧と比較して検出され、検出出力はアナ
ログスイッチ53に送られ同スイッチ53が閉じる。よ
って発振器7の出力は、調光スイッチ8が開いているに
もかかわらず、アナログスイッチ53を介してカウンタ
51に供給され、インバータ2の出力は、連続出力から
断続出力になる。このようにして5点灯異常が発生する
とインバータ2から放電灯3へ供給される電力が制限さ
れるので、放電灯3の発熱が抑制され、インバータ2の
スイッチングデノてイス2122に流れる電流の減少と
あいまって、スイッチングデバイス21.22のストレ
スの増大か避けられる。
When a lighting abnormality occurs in the discharge lamp 3 at the end of its life, the voltage of the discharge lamp 3 increases abnormally. This voltage increase is caused by resistance 91.
The voltage is inputted to a voltage comparator 93 via a voltage divider 92, and is detected by comparing it with a predetermined reference voltage.The detection output is sent to an analog switch 53, which closes the switch 53. Therefore, the output of the oscillator 7 is supplied to the counter 51 via the analog switch 53 even though the dimmer switch 8 is open, and the output of the inverter 2 changes from continuous output to intermittent output. In this way, when the 5 lighting abnormality occurs, the power supplied from the inverter 2 to the discharge lamp 3 is restricted, so the heat generation of the discharge lamp 3 is suppressed, and the current flowing to the switching denoise 2122 of the inverter 2 is reduced. Combined with this, an increase in stress on the switching devices 21 and 22 can be avoided.

本実施例は放電灯調光装置であるか、調光スイッチ8を
除去して、点灯異常に対する保護装置付きの“放電灯点
灯装置”にすることもてきる。
This embodiment is a discharge lamp dimmer, or the dimmer switch 8 can be removed to create a "discharge lamp lighting device" with a protection device against lighting abnormalities.

第3図に、この発明の第2実施例である“放電灯調光装
置”のブロック図を示す。
FIG. 3 shows a block diagram of a "discharge lamp dimming device" which is a second embodiment of the present invention.

本実施例は、発振回路に電圧制御発振器を用い、点灯異
常の際、この電圧制御発振器の出力周波数を上昇させ、
インバータの出力周波数を上昇させて保護作用をより確
実にする点で前記第1実施例と異なる。
In this embodiment, a voltage controlled oscillator is used in the oscillation circuit, and when a lighting abnormality occurs, the output frequency of this voltage controlled oscillator is increased.
This embodiment differs from the first embodiment in that the output frequency of the inverter is increased to ensure more reliable protection.

以下第1実施例との相違点に重点をおいて説明する。The following description will focus on the differences from the first embodiment.

第3図において、76は、第4図に示す如く、出力周波
数が入力電圧に比例する特性の電圧制御発振器であり、
71.72は直流電源1に接続される抵抗分圧器を構成
する抵抗であって分圧電圧は電圧制御発振器76に供給
される。74は抵抗73を抵抗71に並列接続するスイ
ッチとして動作するトランジスタであり、75は電圧比
較器93の出力側とトランジスタ74のベースの間に接
続された電流制限抵抗である。
In FIG. 3, 76 is a voltage controlled oscillator whose output frequency is proportional to the input voltage, as shown in FIG.
71 and 72 are resistors constituting a resistive voltage divider connected to the DC power supply 1, and the divided voltage is supplied to the voltage controlled oscillator 76. 74 is a transistor that operates as a switch connecting resistor 73 and resistor 71 in parallel, and 75 is a current limiting resistor connected between the output side of voltage comparator 93 and the base of transistor 74.

第5図は本実施例の動作説明図であり、(イ)は全光状
態における放電灯3の電流の周波数と振幅を、(ロ)は
調光状態における、(ハ)は点灯異常時における放電灯
3の電流の断続状態1周波数、振幅を示す。
FIG. 5 is an explanatory diagram of the operation of this embodiment, in which (a) shows the frequency and amplitude of the current of the discharge lamp 3 in the full light state, (b) in the dimming state, and (c) in the case of abnormal lighting. The intermittent state 1 frequency and amplitude of the current of the discharge lamp 3 are shown.

次に動作について説明する。Next, the operation will be explained.

正常点灯時の動作は、第1実施例と同様である。即ち、
調光スイッチ8か開いていると、電圧制御発振器76は
その入力端子で決まる出力周波数たとえばf、で発振し
、インバータ2は周波数f、の高周波電力を放電灯3に
供給し、放電灯3には第5図(イ)に示すように、周波
数f、で振幅A1の連続電流が流れ、全光状態にある。
The operation during normal lighting is the same as in the first embodiment. That is,
When the dimmer switch 8 is open, the voltage controlled oscillator 76 oscillates at an output frequency determined by its input terminal, e.g., f, and the inverter 2 supplies high frequency power of frequency f to the discharge lamp 3. As shown in FIG. 5(a), a continuous current of amplitude A1 flows at frequency f and is in a full-light state.

調光スイッチ8を閉じると、第5図(ロ)に示すように
、放電灯3の電流は、周波数f3.振幅A1のまま断続
し、調光状態になる。
When the dimmer switch 8 is closed, the current of the discharge lamp 3 changes to the frequency f3. It continues intermittently with the amplitude A1 and enters the dimming state.

放電灯3に点灯異常が起こり、放電灯3の電圧が異常に
上昇すると、異常検知回路9の検知出力がアナログスイ
ッチ53.トランジスタ74に供給され、アナログスイ
ッチ53.トランジスタ74が閉じる。トランジスタ7
4が閉じると、電圧制御発振器76の入力端子が上昇し
、出力周波数がflから第2に上昇し、アナログスイッ
チ53が閉じると、調光スイッチ8が開いていても、電
圧制御発振器76の出力がチューティ比制御回路5のカ
ウンタ51に供給される。
When a lighting abnormality occurs in the discharge lamp 3 and the voltage of the discharge lamp 3 abnormally increases, the detection output of the abnormality detection circuit 9 is switched to the analog switch 53. transistor 74 and analog switch 53 . Transistor 74 closes. transistor 7
4 closes, the input terminal of the voltage controlled oscillator 76 rises, the output frequency rises from fl to the second, and when the analog switch 53 closes, the output of the voltage controlled oscillator 76 rises even if the dimmer switch 8 is open. is supplied to the counter 51 of the tuteity ratio control circuit 5.

よって、インバータ2の出力周波数はf、→f2と上昇
し、コイル25のインピーダンスが増加して、放電灯3
の電流の振幅は減少し、また、電圧制御発振器76の出
力周波数がf1→f2と上昇するので、デユーティ比制
御回路5の出力の周期はT−+T3と短くなるが、時限
回路52の時限は第2のまま変らないので、結局、デユ
ーティ比は(Ta  第2)/Taで小さくなる。
Therefore, the output frequency of the inverter 2 increases from f to f2, the impedance of the coil 25 increases, and the discharge lamp 3
The amplitude of the current decreases, and the output frequency of the voltage controlled oscillator 76 increases from f1 to f2, so the period of the output of the duty ratio control circuit 5 becomes short to T-+T3, but the time limit of the time limit circuit 52 becomes Since the second value remains unchanged, the duty ratio eventually becomes smaller by (Ta second)/Ta.

このようにして、点灯異常の際、放電灯3の電流は、第
5図に示すように、調光スイッチ8が開いているときは
、(イ)→(ハ)に、調光スイッチ8が閉じているとき
は(ロ)→(ハ)に変り、放電灯3へ供給される電流、
電力は大きく減少し、インバータ2のスイッチングデバ
イス21゜22のストレスの増大か避けられる。
In this way, in the event of a lighting abnormality, the current of the discharge lamp 3 changes from (a) to (c) when the dimmer switch 8 is open, as shown in FIG. When it is closed, it changes from (b) to (c), and the current supplied to the discharge lamp 3,
The power is greatly reduced and increased stress on the switching devices 21 and 22 of the inverter 2 is avoided.

なお、以上の各実施例は、安定器にコイル25を用いた
点灯回路を採用しているか、この発明はこれに限定され
るものではなく、例えば、第8図の従来例のように、安
定器にコンデンサを用いた点灯回路についても実施でき
る。その際、放電灯への供給電力を減少させるには、イ
ンバータの出力周波数を下げればよい。
Note that each of the above embodiments employs a lighting circuit using a coil 25 as a ballast, and the present invention is not limited to this. For example, as in the conventional example shown in FIG. It can also be implemented for lighting circuits that use capacitors. In this case, in order to reduce the power supplied to the discharge lamp, the output frequency of the inverter may be lowered.

さらに、異常検知回路の構成は、各実施例の構成に限定
されるものではなく、例えば、放電灯の温度により点灯
異常を検知するタイプでもよい。
Further, the configuration of the abnormality detection circuit is not limited to the configuration of each embodiment, and may be of a type that detects lighting abnormality based on the temperature of the discharge lamp, for example.

また、各実施例では、デユーティ比制御回路は、所定の
周期Tの信号を発生するものであるが、このように周期
を一定で放電灯への電力供給期間T1あるいは停止期間
T2を変化させてチューティ比を変化させる以外にも、
周期を変えて放電灯への電力供給期間T1と停止期間T
2どの比率を変えデユーティ比を変化させるものてもよ
く、チューティ比制御回路の構成は、各実施例に示すよ
うなカウンタと時限回路との組合せに限定されない。
Further, in each embodiment, the duty ratio control circuit generates a signal with a predetermined cycle T, but in this way, the cycle is constant and the power supply period T1 or stop period T2 to the discharge lamp is varied. In addition to changing the tutee ratio,
Power supply period T1 and stop period T to the discharge lamp by changing the cycle
2. Any ratio may be changed to change the duty ratio, and the configuration of the duty ratio control circuit is not limited to the combination of a counter and a timer circuit as shown in each embodiment.

第6図、第7図は、この発明を適用てきるインバータの
異なる回路例を示すものであり、このようなインバータ
ではスイッチングデバイス21か個であるので駆動回路
6の構成もこれに対応できるものに、例えばドライバが
一個のものにすればよい。また、負荷の放電灯は、−灯
たけでなく多灯用の構成にしだものてもよいことはもち
ろんである。
6 and 7 show different circuit examples of an inverter to which the present invention can be applied. Since such an inverter has 21 switching devices, the configuration of the drive circuit 6 can also correspond to this. For example, it is sufficient to use only one driver. Further, it goes without saying that the load discharge lamp may be configured not only for one lamp but also for multiple lamps.

直流電源1の構成は、電池等の直流電源以外に、交流電
源を整流して得た直流電源等てもよい。
The structure of the DC power source 1 may be a DC power source obtained by rectifying an AC power source, or the like, in addition to a DC power source such as a battery.

放電灯への電力供給期間T1と停止期間T2を緑返す周
期Tは、特に限定しないが、人間の目てちらつきとして
感じられないように選定すべきである。
The period T during which the power supply period T1 and the stop period T2 to the discharge lamp are changed to green is not particularly limited, but should be selected so as not to be perceived as flickering to the human eye.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、この発明によれば、放電灯に点灯
異常が起きても、点灯装置のインバータにおけるスイッ
チングデバイスのストレスの増大が阻止され、破損か防
止できる。
As described above, according to the present invention, even if a lighting abnormality occurs in the discharge lamp, stress on the switching device in the inverter of the lighting device is prevented from increasing, and damage to the switching device can be prevented.

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

第1図はこの発明の第1実施例のブロック図、第2図は
同実施例の動作説明図、第3図はこの発明の第2実施例
のブロック図、第4図、第5図は同実施例の動作説明図
、第6図、第7図はインバータの回路例を示す図、第8
図は従来例の回路図、第9図は同従来例の動作説明図で
ある。 図において、2はインバータ、3は放電灯、5はデユー
ティ比制御回路、9は異常検知回路、25はコイル、5
3はアナログスイッチである。 なお、図中、同一符号は同一または相当部分を示す。
FIG. 1 is a block diagram of the first embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of the same embodiment, FIG. 3 is a block diagram of the second embodiment of the invention, and FIGS. 4 and 5 are 6 and 7 are diagrams illustrating an example of the inverter circuit.
The figure is a circuit diagram of a conventional example, and FIG. 9 is an explanatory diagram of the operation of the conventional example. In the figure, 2 is an inverter, 3 is a discharge lamp, 5 is a duty ratio control circuit, 9 is an abnormality detection circuit, 25 is a coil, 5
3 is an analog switch. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

【特許請求の範囲】[Claims] (1)高周波電力を放電灯に供給するインバータと、該
インバータから前記放電灯に供給する電力を制限する電
力制限手段と、前記放電灯の点灯異常を検知する異常検
知手段と、該異常検知手段の出力に応じて前記電力制限
手段を投入する投入手段とを備えたことを特徴とする放
電灯点灯装置。
(1) An inverter that supplies high-frequency power to the discharge lamp, a power limiting means that limits the power supplied from the inverter to the discharge lamp, an abnormality detection means that detects a lighting abnormality of the discharge lamp, and the abnormality detection means A discharge lamp lighting device comprising: a power-on means for turning on the power limiting means according to the output of the discharge lamp lighting device.
JP2044777A 1990-02-26 1990-02-26 Lighting device for discharge lamp Pending JPH03246893A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2044777A JPH03246893A (en) 1990-02-26 1990-02-26 Lighting device for discharge lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2044777A JPH03246893A (en) 1990-02-26 1990-02-26 Lighting device for discharge lamp

Publications (1)

Publication Number Publication Date
JPH03246893A true JPH03246893A (en) 1991-11-05

Family

ID=12700848

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2044777A Pending JPH03246893A (en) 1990-02-26 1990-02-26 Lighting device for discharge lamp

Country Status (1)

Country Link
JP (1) JPH03246893A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6392364B1 (en) 1999-06-21 2002-05-21 Denso Corporation High voltage discharge lamp apparatus for vehicles
JP2012029430A (en) * 2010-07-22 2012-02-09 Mitsubishi Electric Corp Inverter type power supply and lighting apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6392364B1 (en) 1999-06-21 2002-05-21 Denso Corporation High voltage discharge lamp apparatus for vehicles
JP2012029430A (en) * 2010-07-22 2012-02-09 Mitsubishi Electric Corp Inverter type power supply and lighting apparatus

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