JP2011187294A - Discharge lamp lighting device - Google Patents

Discharge lamp lighting device Download PDF

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JP2011187294A
JP2011187294A JP2010050740A JP2010050740A JP2011187294A JP 2011187294 A JP2011187294 A JP 2011187294A JP 2010050740 A JP2010050740 A JP 2010050740A JP 2010050740 A JP2010050740 A JP 2010050740A JP 2011187294 A JP2011187294 A JP 2011187294A
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current
frequency
discharge lamp
filament
circuit
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Shizuo Masuda
静雄 増田
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Shihen Technical Corp
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Shihen Technical Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device which is controllable to be at a given tube current without being affected by a volume of current other than the tube current, with the use of inexpensive parts and without upsizing. <P>SOLUTION: A current detecting circuit (a tube current detecting part 8) is provided for flowing current outside the current route (a third filament current route 9i3) on the way of the filament current route (the third filament current route 9i3) where filament current flows, and a tube current detecting means (a resistor R3) is connected with the current detecting circuit (the tube current detecting part 8). Further, a current control means (a tube current control circuit 3 and a control circuit 1) controls a load circuit 2 to impress high-frequency lighting voltage between filaments (between Fm1a and Fm1b, between Fm2a and Fm2b), and frequencies of the high-frequency lighting voltage are to be controlled so that the tube current is constant on the basis of fluctuation of detection signals detected at the detecting part (the tube current detecting part 8). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

この発明は、放電灯の管電流が所定の電流になるよう制御する放電灯点灯装置に関するものである。   The present invention relates to a discharge lamp lighting device that controls a tube current of a discharge lamp to be a predetermined current.

従来の放電灯点灯装置には、放電灯に流れる管電流の変化を回路電圧の変化から間接的に検出して、この回路電圧の変化に基づき放電灯点灯に流れる電流が所定の電流になるよう制御するようにしたものがある。   In a conventional discharge lamp lighting device, a change in tube current flowing through a discharge lamp is indirectly detected from a change in circuit voltage, and a current flowing through the discharge lamp becomes a predetermined current based on the change in circuit voltage. There is something to control.

この管電流の検出方法としては、放電灯点灯回路のスイッチ素子の出力に抵抗を挿入して、その抵抗の電圧を検出する抵抗電圧検出方法が知られている（例えば、特許文献１参照）。また、他の電圧の検出方法としては、放電灯の出力にカレントトランスを挿入して、そのトランスの2次側の電圧を検出するトランス電圧検出方法等が知られている。   As a tube current detection method, a resistance voltage detection method is known in which a resistor is inserted into the output of a switch element of a discharge lamp lighting circuit and the voltage of the resistor is detected (see, for example, Patent Document 1). As another voltage detection method, a transformer voltage detection method is known in which a current transformer is inserted into the output of the discharge lamp and a voltage on the secondary side of the transformer is detected.

特開平８−１１２８９号公報JP-A-8-11289

しかし、前者の抵抗電圧検出方法では、スイッチ素子に流入する電流が放電灯の管電流に加え、フィラメントに流れる電流やスイッチ素子の発振ノイズを軽減する目的で付加されるスナバー回路の電流及び放電灯の異常を検出する目的で付加される保護回路の電流の合成電流となる為、管電流はそれ以外の電流量に影響されるという問題がある。   However, in the former resistance voltage detection method, the current flowing into the switch element is added to the tube current of the discharge lamp, the current of the snubber circuit added for the purpose of reducing the current flowing in the filament and the oscillation noise of the switch element, and the discharge lamp. Therefore, the tube current is affected by the amount of current other than the current of the protection circuit added for the purpose of detecting the abnormality.

また、後者のトランス電圧検出方法では、放電灯の出力にトランスを挿入する為、管電流のみを検出可能であり、フィラメント電流などの電流量に影響されない点で前者の課題を解決可能である。しかし、放電灯の出力にトランスを用いるために、装置が大型化すると共に、それ自体が高価で大きく材料費が高くなるという問題がある。   In the latter transformer voltage detection method, since the transformer is inserted into the output of the discharge lamp, only the tube current can be detected, and the former problem can be solved in that it is not affected by the amount of current such as filament current. However, since a transformer is used for the output of the discharge lamp, there is a problem that the apparatus becomes large, and the device itself is expensive and large in material cost.

そこで、この発明は、管電流以外の電流量に影響されること無く、大型化せずに、安価な部品を使用し、所定の管電流になるよう制御可能な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。   Accordingly, the present invention provides a discharge lamp lighting device that is not affected by the amount of current other than the tube current and that can be controlled so as to obtain a predetermined tube current by using inexpensive parts without increasing the size. It is intended.

この目的を達成するため、この発明は、放電灯のフィラメントにフィラメント電流を流して前記フィラメントを予熱可能に且つ前記フィラメント間に高周波点灯電圧を印加可能に設けられた負荷回路と、前記負荷回路に高周波交流を供給して、前記フィラメント電流を流すことにより前記フィラメントを予熱させた後に、前記フィラメント間に前記高周波点灯電圧を印加して前記放電灯に管電流を流す高周波発生手段と、前記放電灯に流れる管電流を検出させる管電流検出手段と、前記管電流検出手段の検出結果に基づいて前記放電灯に流れる電流が所定の管電流になるように前記高周波交流を制御する電流制御手段と、を備えた放電灯点灯装置であって、前記管電流検出手段は前記フィラメント電流の流れるフィラメント電流経路外に設けられ且つ前記フィラメント電流経路途中に接続された検出部であり、前記検出部からの検出信号が前記電流制御手段に入力されると共に、前記電流制御手段は前記負荷回路を制御して前記フィラメント間に高周波点灯電圧を印加して、前記検出部で検出される検出信号の変動に基づき前記管電流が所定の値となるように前記高周波点灯電圧の周波数を制御する放電灯点灯装置としたことを特徴とする。   In order to achieve this object, the present invention provides a load circuit provided to allow a filament current to flow through a filament of a discharge lamp so that the filament can be preheated and to apply a high-frequency lighting voltage between the filaments, and to the load circuit. High-frequency generating means for supplying high-frequency alternating current and preheating the filament by flowing the filament current, and then applying the high-frequency lighting voltage between the filaments to flow a tube current to the discharge lamp; and the discharge lamp Tube current detection means for detecting the tube current flowing through the current, and current control means for controlling the high-frequency alternating current so that the current flowing through the discharge lamp becomes a predetermined tube current based on the detection result of the tube current detection means, A discharge lamp lighting device comprising: the tube current detecting means provided outside the filament current path through which the filament current flows. And a detection unit connected in the middle of the filament current path, and a detection signal from the detection unit is input to the current control unit, and the current control unit controls the load circuit to connect between the filaments. A discharge lamp lighting device that applies a high-frequency lighting voltage and controls the frequency of the high-frequency lighting voltage so that the tube current becomes a predetermined value based on a change in a detection signal detected by the detection unit. And

この構成によれば、管電流以外の電流量に影響されること無く、大型化せずに、安価な部品を使用し、所定の管電流になるよう制御できる。   According to this configuration, it is possible to control to obtain a predetermined tube current by using inexpensive parts without being increased in size without being influenced by a current amount other than the tube current.

この発明に係る放電灯点灯装置の放電灯制御回路図である。It is a discharge lamp control circuit diagram of the discharge lamp lighting device according to the present invention.

以下、この発明の実施の形態を図1に基づいて説明する。
[構成]
図1は、この発明にかかる放電灯点灯装置を示したものである。この放電灯点灯装置は、放電灯点灯用の高周波の交流電圧（高周波点灯電圧）を発生させる制御回路（高周波交流発生手段）１と、この制御回路１ににより動作制御される負荷回路２と、管電流制御回路３を有する。
＜制御回路１＞
この制御回路１は、直流電源Ｅ１，スイッチング素子ＴＲ１，ＴＲ２、スナバーコンデンサCl，C２，駆動回路４を有する。この直流電源Ｅ１のプラス側にはプラス側配線Ｅ１ａが接続され、直流電源Ｅ１のマイナス側にはマイナス側配線（アース側配線）Ｅ１ｂが接続されている。 Hereinafter, an embodiment of the present invention will be described with reference to FIG.
[Constitution]
FIG. 1 shows a discharge lamp lighting device according to the present invention. The discharge lamp lighting device includes a control circuit (high-frequency alternating current generating means) 1 that generates a high-frequency AC voltage (high-frequency lighting voltage) for lighting a discharge lamp, a load circuit 2 that is controlled in operation by the control circuit 1, A tube current control circuit 3 is provided.
<Control circuit 1>
The control circuit 1 includes a DC power supply E1, switching elements TR1 and TR2, snubber capacitors Cl and C2, and a drive circuit 4. A plus side wiring E1a is connected to the plus side of the DC power supply E1, and a minus side wiring (ground side wiring) E1b is connected to the minus side of the DC power supply E1.

尚、直流電源Ｅ１は、例えば商用電源の交流を脈流のある直流に整流する入力平滑回路(図示せず)が用いられている。また、スイッチング素子ＴＲ１，ＴＲ２は、プラス側配線Ｅ１ａとマイナス側配線Ｅ１ｂとの間に直列に接続されている。尚、５はスイッチング素子ＴＲ１，ＴＲ２を直列に接続する素子接続線である。   As the DC power source E1, for example, an input smoothing circuit (not shown) that rectifies the AC of the commercial power source to a pulsating DC is used. The switching elements TR1 and TR2 are connected in series between the plus side wiring E1a and the minus side wiring E1b. Reference numeral 5 denotes an element connection line for connecting the switching elements TR1 and TR2 in series.

更に、スナバーコンデンサClはスイッチング素子ＴＲ１に並列に接続され、スナバーコンデンサC２はスイッチング素子ＴＲ２に並列に接続されている。   Further, the snubber capacitor Cl is connected in parallel to the switching element TR1, and the snubber capacitor C2 is connected in parallel to the switching element TR2.

また、駆動回路４は、スイッチング素子ＴＲ１，ＴＲ２のベースに抵抗Ｒ１を介してＯＮ・ＯＦＦ制御電圧を印加することにより、スイッチング素子ＴＲ１をＯＮ・ＯＦＦ制御するようになっている。また、駆動回路４は、スイッチング素子ＴＲ２のベースに抵抗Ｒ２をＯＮ・ＯＦＦ制御電圧を印加することにより、スイッチング素子ＴＲ２をＯＮ・ＯＦＦ制御するようになっている。
＜負荷回路２＞
この負荷回路２は、インダクタンスであるトランスＴ１を有する。すなわち、トランスＴ１は、インダクタンスである一次コイル（一次巻線）Ｌ１と、インダクタンスである３つの二次コイル（二次巻線）Ｌ２ａ，Ｌ２ｂ，Ｌ２ｃと、一次コイルＬ１と二次コイルＬ２ａ，Ｌ２ｂ，Ｌ２ｃとの間の鉄心Ｆcを備えている。 Further, the drive circuit 4 applies ON / OFF control voltage to the bases of the switching elements TR1 and TR2 via the resistor R1, thereby controlling the switching element TR1 on and off. Further, the drive circuit 4 applies ON / OFF control voltage for the resistor R2 to the base of the switching element TR2, thereby controlling ON / OFF of the switching element TR2.
<Load circuit 2>
The load circuit 2 includes a transformer T1 that is an inductance. That is, the transformer T1 includes a primary coil (primary winding) L1 that is an inductance, three secondary coils (secondary windings) L2a, L2b, and L2c that are inductances, a primary coil L1, and secondary coils L2a and L2b. , L2c, an iron core Fc is provided.

しかも、負荷回路２は符号を省略した入力側の直列回路（入力側直列共振回路すなわち点灯交流用共振回路）を有する。この入力側の直列回路は、配線６を介して素子接続線５に一端が接続されたコンデンサＣ３と、コンデンサＣ３の他端と負荷接続線７の一端との間に接続されたトランスＴ１の一次コイルＬ１と、負荷接続線７とマイナス側配線Ｅ１ｂとの間に介装されたコンデンサＣ７を備えている。   Moreover, the load circuit 2 has an input-side series circuit (an input-side series resonance circuit, that is, a lighting AC resonance circuit) that is omitted from the reference numerals. This input-side series circuit includes a capacitor C3 having one end connected to the element connection line 5 via the wiring 6, and a primary of the transformer T1 connected between the other end of the capacitor C3 and one end of the load connection line 7. A coil C1 and a capacitor C7 interposed between the load connection line 7 and the minus side wiring E1b are provided.

また、負荷回路２は、負荷接続線７の他端に直列に接続される第１，第２放電灯（負荷である放電管）Ｄｔ１，Ｄｔ２と、この第２放電灯Ｄｔ２とマイナス側配線Ｅ１ｂとの間に接続される管電流検出部（管電流検出手段）８を管電圧検出部として有する。尚、コンデンサＣ７は、第１，第２放電灯Ｄｔ１，Ｄｔ２及び管電流検出部８と並列に設けられている。   Further, the load circuit 2 includes first and second discharge lamps (discharge tubes as loads) Dt1 and Dt2 connected in series to the other end of the load connection line 7, and the second discharge lamp Dt2 and the minus-side wiring E1b. The tube current detection unit (tube current detection means) 8 connected between the two is provided as a tube voltage detection unit. The capacitor C7 is provided in parallel with the first and second discharge lamps Dt1 and Dt2 and the tube current detector 8.

第１放電灯Ｄｔ１は、密閉された真空チューブＴｕ１と、真空チューブＴｕ１の両端部内に設けられたフィラメントＦｍ１ａ，Ｆｍ１ｂを有する。尚、フィラメントＦｍ１ａには負荷接続線７の他端が接続されている。また、第２放電灯Ｄｔ２は、密閉された真空チューブＴｕ２と、真空チューブＴｕ２の両端部内に設けられたフィラメントＦｍ２ａ，Ｆｍ２ｂを有する。   The first discharge lamp Dt1 includes a sealed vacuum tube Tu1 and filaments Fm1a and Fm1b provided in both ends of the vacuum tube Tu1. In addition, the other end of the load connection line 7 is connected to the filament Fm1a. The second discharge lamp Dt2 includes a sealed vacuum tube Tu2 and filaments Fm2a and Fm2b provided in both ends of the vacuum tube Tu2.

更に、負荷回路２は予熱回路９を有する。この予熱回路（予熱用共振回路）９は、符号を省略した３つの第１，第２，第３予熱直列回路（第１，第２，第３予熱用直列共振回路）を備えている。   Furthermore, the load circuit 2 has a preheating circuit 9. The preheating circuit (preheating resonance circuit) 9 includes three first, second, and third preheating series circuits (first, second, and third preheating series resonance circuits) that are omitted from the reference numerals.

この第１予熱直列回路は、放電灯のフィラメントＦｍ１ａに直列に接続された二次コイルＬ２ａ，コンデンサＣ４を有する。この二次コイルＬ２ａ，コンデンサＣ４，フィラメントＦｍ１ａは第１フィラメント電流経路９ｉ１を形成している。   This first preheating series circuit includes a secondary coil L2a and a capacitor C4 connected in series to the filament Fm1a of the discharge lamp. The secondary coil L2a, capacitor C4, and filament Fm1a form a first filament current path 9i1.

第２予熱直列回路は、フィラメントＦｍ２ａに直列に接続された二次コイルＬ２ｂ，コンデンサＣ５を有する。この二次コイルＬ２ｂ，コンデンサＣ５，フィラメントＦｍ１ｂ及びフィラメントＦｍ２ａは、第２フィラメント電流経路９ｉ２を形成している。   The second preheating series circuit includes a secondary coil L2b and a capacitor C5 connected in series to the filament Fm2a. The secondary coil L2b, capacitor C5, filament Fm1b and filament Fm2a form a second filament current path 9i2.

第３予熱直列回路は、フィラメントＦｍ２ｂに直列に接続された二次コイルＬ２ｃ，コンデンサＣ６を有する。この二次コイルＬ２ｃ，コンデンサＣ６及びフィラメントＦｍ２ｂは、第３フィラメント電流経路９ｉ３を形成している。
尚、１０は、フィラメントＦｍ２ｂと二次コイル２ｃに一端とを接続する接続線である。また、負荷回路２は、上述した入力側の直列回路及び第１〜第３予熱直列回路等により特定の高周波で共振する負荷回路共振周波数を有する。
（管電流検出部８）
また、接続線１０とマイナス側配線Ｅ１ｂとの間には管電流検出部８が配設されている。この管電流検出部８は、アノード側がマイナス側配線Ｅ１ｂに接続され且つカソード側が接続線１０に接続されたダイオードＤ１と、接続線１０にアノード側が接続されたダイオードＤ２と、このダイオードＤ２のカソード側とマイナス側配線Ｅ１ｂとの間に接続された抵抗Ｒ３を有する。これにより、ダイオードＤ１はマイナス側配線Ｅ１ｂ側から接続線１０側に電流・電圧を供給可能に設けられ、ダイオードＤ２は接続線１０側からマイナス側配線Ｅ１ｂ側に電流・電圧を供給可能に設けられている。
＜管電流制御回路３＞
この管電流制御回路３は、管電流検出部８のダイオードＤ２と抵抗Ｒ３との間で発生する半波電圧を検出し平均化する平滑回路１１と、この平滑回路１１で平滑・平均化された検出電圧がマイナス側に入力される比較回路１２と、この比較回路１２のプラス側とマイナス側配線Ｅ１ｂとの間に介装された直流電源Ｅ２を有する。 The third preheating series circuit includes a secondary coil L2c and a capacitor C6 connected in series to the filament Fm2b. The secondary coil L2c, the capacitor C6, and the filament Fm2b form a third filament current path 9i3.
In addition, 10 is a connection line which connects one end to the filament Fm2b and the secondary coil 2c. Further, the load circuit 2 has a load circuit resonance frequency that resonates at a specific high frequency by the above-described input-side series circuit and first to third preheating series circuits.
(Tube current detector 8)
In addition, a tube current detection unit 8 is disposed between the connection line 10 and the minus side wiring E1b. The tube current detection unit 8 includes a diode D1 whose anode side is connected to the minus side wiring E1b and whose cathode side is connected to the connection line 10, a diode D2 whose anode side is connected to the connection line 10, and a cathode side of the diode D2. And a negative-side wiring E1b. Thus, the diode D1 is provided so as to be able to supply current / voltage from the minus side wiring E1b side to the connecting line 10 side, and the diode D2 is provided so as to be able to supply current / voltage from the connecting line 10 side to the minus side wiring E1b side. ing.
<Tube current control circuit 3>
The tube current control circuit 3 is a smoothing circuit 11 that detects and averages a half-wave voltage generated between the diode D2 and the resistor R3 of the tube current detection unit 8, and is smoothed and averaged by the smoothing circuit 11. The comparison circuit 12 has a detection voltage inputted to the minus side, and a DC power source E2 interposed between the plus side and the minus side wiring E1b of the comparison circuit 12.

この直流電源Ｅ２は、比較回路１２のプラス側に基準電圧を印加するようになっている。また、比較回路１２は、検出電圧と基準電圧を比較して差分電圧を出力し、この差分電圧を駆動回路４に入力するようになっている。そして、駆動回路４は、比較回路１２からの出力である差分電圧を受けて、検出電圧が基準電圧（直流電源電圧）と同じになるように、出力周波数を調整（制御）するようになっている。すなわち、管電流検出部８で発生した半波電圧を抵抗R4及びコンデンサC8にて平均化した検出電圧とし、管電流の目標となる直流電源電圧を直流電源Ｅ２から供給される基準電圧としたとき、比較回路１２は検出電圧が基準電圧と同じになるよう駆動回路４の出力周波数を調整する。
[作用]
次に、このような構成の放電灯点灯装置の作用を説明する。 The DC power supply E2 applies a reference voltage to the plus side of the comparison circuit 12. The comparison circuit 12 compares the detection voltage with the reference voltage and outputs a differential voltage, and inputs the differential voltage to the drive circuit 4. The drive circuit 4 receives the differential voltage output from the comparison circuit 12 and adjusts (controls) the output frequency so that the detected voltage becomes the same as the reference voltage (DC power supply voltage). Yes. That is, when the half-wave voltage generated in the tube current detection unit 8 is a detection voltage averaged by the resistor R4 and the capacitor C8, and the DC power supply voltage targeted for the tube current is the reference voltage supplied from the DC power supply E2. The comparison circuit 12 adjusts the output frequency of the drive circuit 4 so that the detected voltage becomes the same as the reference voltage.
[Action]
Next, the operation of the discharge lamp lighting device having such a configuration will be described.

このような構成において制御回路１の駆動回路４は、スイッチング素子ＴＲ１，ＴＲ２のベースに抵抗Ｒ１，Ｒ２を介してＯＮ・ＯＦＦ制御電圧（制御信号）を交互に供給して、スイッチング素子ＴＲ１，ＴＲ２を交互にＯＮ・ＯＦＦさせ、直流電源Ｅ１からの直流（直流電圧・直流電流）をスイッチング素子ＴＲ１，ＴＲ２により高周波交流（高周波交流電圧・高周波交流電流）として負荷回路２の入力側の直列回路のコンデンサＣ３に入力する。   In such a configuration, the drive circuit 4 of the control circuit 1 alternately supplies an ON / OFF control voltage (control signal) to the bases of the switching elements TR1 and TR2 via the resistors R1 and R2, thereby switching the switching elements TR1 and TR2. Are alternately turned ON / OFF, and the direct current (DC voltage / DC current) from the DC power source E1 is converted into high-frequency alternating current (high-frequency alternating voltage / high-frequency alternating current) by the switching elements TR1 and TR2. Input to capacitor C3.

この際、制御回路１は、負荷回路２を負荷回路共振周波数よりも十分高い周波数でおよそ所定の予熱時間（例えば、1秒間）発振するように、駆動回路４により高周波交流を負荷回路２に供給する。   At this time, the control circuit 1 supplies high-frequency alternating current to the load circuit 2 by the drive circuit 4 so that the load circuit 2 oscillates at a frequency sufficiently higher than the load circuit resonance frequency for a predetermined preheating time (for example, 1 second). To do.

これにより予熱回路９の二次コイルＬ２ａ〜Ｌ２ｃに交流（交流電圧・交流電流）が発生する。そして、この交流が二次コイルＬ２ａを有する第１予熱直列回路の第１フィラメント電流経路９ｉ１に流れて、第１予熱直列回路を構成するフィラメントＦｍ１ａが発熱し予熱される。同様に、交流が二次コイルＬ２ｂを有する第２予熱直回路の第２フィラメント電流経路９ｉ２に流れて、第２直列回路を構成するフィラメントＦｍ１ｂ，Ｆｍ２ａが発熱し予熱される。更に、交流が二次コイルＬ２ｃを有する第３予熱直列回路の第３フィラメント電流経路９ｉ３に流れて、第３直列回路を構成するフィラメントＦｍ２ｂが発熱し予熱される。   Thereby, alternating current (alternating voltage and alternating current) is generated in the secondary coils L2a to L2c of the preheating circuit 9. And this alternating current flows into the 1st filament current path 9i1 of the 1st preheating series circuit which has secondary coil L2a, and filament Fm1a which constitutes the 1st preheating series circuit generates heat and is preheated. Similarly, alternating current flows through the second filament current path 9i2 of the second preheating direct circuit having the secondary coil L2b, and the filaments Fm1b and Fm2a constituting the second series circuit generate heat and are preheated. Furthermore, alternating current flows through the third filament current path 9i3 of the third preheating series circuit having the secondary coil L2c, and the filament Fm2b constituting the third series circuit generates heat and is preheated.

そして、駆動回路４は、所定の予熱時間が経過すると、制御回路１から負荷回路２に供給される高周波交流の周波数が低くなる方向に遷移させる。   Then, when a predetermined preheating time has elapsed, the drive circuit 4 makes a transition in a direction in which the frequency of the high-frequency alternating current supplied from the control circuit 1 to the load circuit 2 decreases.

これに伴い、第１放電灯Ｄｔ１のフィラメントＦｍ１ａ，Ｆｍ１ｂ間に印加されている交流電圧により、フィラメントＦｍ１ａ，Ｆｍ１ｂ間に管電流が流れて、第１放電灯Ｄｔ１が点灯する。同時に、第２放電灯Ｄｔ２のフィラメントＦｍ２ａ，Ｆｍ２ｂ間に印加されている交流電圧により、フィラメントＦｍ２ａ，Ｆｍ２ｂ間に管電流が流れて、第２放電灯Ｄｔ２が点灯する。   Accordingly, a tube current flows between the filaments Fm1a and Fm1b by the alternating voltage applied between the filaments Fm1a and Fm1b of the first discharge lamp Dt1, and the first discharge lamp Dt1 is lit. At the same time, a tube current flows between the filaments Fm2a and Fm2b by the alternating voltage applied between the filaments Fm2a and Fm2b of the second discharge lamp Dt2, and the second discharge lamp Dt2 is lit.

この際、管電流検出部８のダイオードＤ２と抵抗Ｒ３との間の半波電圧が管電流制御回路３で検出される。すなわち、ダイオードＤ２と抵抗Ｒ３との間の半波電圧が管電流制御回路３の平滑回路１１に入力されて、この半波電圧が平滑回路１１の抵抗Ｒ１とコンデンサＣ８により平滑されて平均化した検出電圧となり、この検出電圧が比較回路１２のマイナス側に入力される。一方、この比較回路１２のプラス側には管電流の目標値を決定する基準電圧が直流電源Ｅ２から入力されている。   At this time, the half-wave voltage between the diode D2 of the tube current detector 8 and the resistor R3 is detected by the tube current control circuit 3. That is, the half-wave voltage between the diode D2 and the resistor R3 is input to the smoothing circuit 11 of the tube current control circuit 3, and this half-wave voltage is smoothed and averaged by the resistor R1 and the capacitor C8 of the smoothing circuit 11. The detection voltage is input to the negative side of the comparison circuit 12. On the other hand, a reference voltage for determining a target value of the tube current is input from the DC power source E2 to the plus side of the comparison circuit 12.

そして、比較回路１２は、検出電圧と基準電圧とを比較して、検出電圧と基準電圧の差分電圧を出力して制御回路１の駆動回路４に入力する。この駆動回路４は、比較回路１２からの出力である差分電圧を受けて、検出電圧が基準電圧（直流電源電圧）と同じになるように、駆動回路４の出力周波数を調整して、制御回路１から負荷回路２に供給される高周波電流の周波数を調整（制御）する。   The comparison circuit 12 compares the detection voltage with the reference voltage, outputs a difference voltage between the detection voltage and the reference voltage, and inputs the difference voltage to the drive circuit 4 of the control circuit 1. The drive circuit 4 receives the differential voltage output from the comparison circuit 12 and adjusts the output frequency of the drive circuit 4 so that the detected voltage becomes the same as the reference voltage (DC power supply voltage). The frequency of the high-frequency current supplied from 1 to the load circuit 2 is adjusted (controlled).

このように第１，第２放電灯Ｄｔ１，Ｄｔ２内に管電流が流れ、この管電流のみによりダイオードＤ２と抵抗Ｒ３との間に生ずる半波電圧を管電流制御回路３で検出することができるので、第１，第２放電灯Ｄｔ１，Ｄｔ２内に流れる管電流のみに基づいて、第１，第２放電灯Ｄｔ１，Ｄｔ２内を流れる管電流が一定の所定値（目標値）となるように、制御回路１の駆動回路４により制御できる。   As described above, the tube current flows in the first and second discharge lamps Dt1 and Dt2, and the tube current control circuit 3 can detect the half-wave voltage generated between the diode D2 and the resistor R3 only by the tube current. Therefore, based on only the tube current flowing in the first and second discharge lamps Dt1 and Dt2, the tube current flowing in the first and second discharge lamps Dt1 and Dt2 is set to a predetermined value (target value). It can be controlled by the drive circuit 4 of the control circuit 1.

以上説明したように、この発明の実施の形態の放電灯点灯装置は、放電灯（第１，第２放電灯Ｄｔ１，Ｄｔ２）のフィラメント（Ｆｍ１ａ，Ｆｍ１ｂ間、Ｆｍ２ａ，Ｆｍ２ｂ間）にフィラメント電流を流して前記フィラメント（Ｆｍ１ａ，Ｆｍ１ｂ、Ｆｍ２ａ，Ｆｍ２ｂ）を予熱可能に且つ前記フィラメント間（Ｆｍ１ａ，Ｆｍ１ｂ間、Ｆｍ２ａ，Ｆｍ２ｂ間）に高周波点灯電圧を印加可能に設けられた負荷回路２を有する。また、放電灯点灯装置は、前記負荷回路２に高周波交流を供給して、前記フィラメント電流を流すことにより前記フィラメント（Ｆｍ１ａ，Ｆｍ１ｂ、Ｆｍ２ａ，Ｆｍ２ｂ）を予熱させた後に、前記フィラメント間（Ｆｍ１ａ，Ｆｍ１ｂ間、Ｆｍ２ａ，Ｆｍ２ｂ間）に前記高周波点灯電圧を印加して前記放電灯（第１，第２放電灯Ｄｔ１，Ｄｔ２）に管電流を流す高周波発生手段（制御回路１）を有する。更に、放電灯点灯装置は、前記放電灯（第１，第２放電灯Ｄｔ１，Ｄｔ２）に流れる管電流を検出させる管電流検出手段(管電流検出部８）と、前記管電流検出手段(管電流検出部８）の検出結果に基づいて前記放電灯（第１，第２放電灯Ｄｔ１，Ｄｔ２）に流れる電流が所定の管電流になるように前記高周波交流を制御する電流制御手段（管電流制御回路３及び制御回路１）と、を備えている。しかも、前記管電流検出手段(管電流検出部８）は前記フィラメント電流の流れるフィラメント電流経路（第３フィラメント電流経路９ｉ３）外に設けられ且つ前記フィラメント電流経路（第３フィラメント電流経路９ｉ３）途中に接続された検出部(管電流検出部８）であり、前記検出部(管電流検出部８）からの検出信号が前記電流制御手段（管電流制御回路３及び制御回路１）に入力される。更に、前記電流制御手段（管電流制御回路３及び制御回路１）は前記負荷回路２を制御して前記フィラメントに間（Ｆｍ１ａ，Ｆｍ１ｂ間、Ｆｍ２ａ，Ｆｍ２ｂ間）高周波点灯電圧を印加して、前記検出部(管電流検出部８）で検出される検出信号の変動に基づき前記管電流が一定となるように前記高周波点灯電圧の周波数を制御するようになっている。   As described above, the discharge lamp lighting device according to the embodiment of the present invention supplies the filament current to the filaments (between Fm1a and Fm1b, between Fm2a and Fm2b) of the discharge lamp (first and second discharge lamps Dt1 and Dt2). The load circuit 2 is provided so that the filaments (Fm1a, Fm1b, Fm2a, Fm2b) can be preheated and a high-frequency lighting voltage can be applied between the filaments (between Fm1a, Fm1b, between Fm2a, Fm2b). The discharge lamp lighting device supplies high frequency alternating current to the load circuit 2 and preheats the filaments (Fm1a, Fm1b, Fm2a, Fm2b) by flowing the filament current, and then between the filaments (Fm1a, High-frequency generating means (control circuit 1) that applies the high-frequency lighting voltage between Fm1b and between Fm2a and Fm2b and causes tube current to flow through the discharge lamps (first and second discharge lamps Dt1 and Dt2). Further, the discharge lamp lighting device includes a tube current detection unit (tube current detection unit 8) for detecting a tube current flowing through the discharge lamp (first and second discharge lamps Dt1, Dt2), and the tube current detection unit (tube Current control means (tube current) for controlling the high-frequency alternating current so that the current flowing through the discharge lamp (first and second discharge lamps Dt1, Dt2) becomes a predetermined tube current based on the detection result of the current detector 8). A control circuit 3 and a control circuit 1). In addition, the tube current detection means (tube current detection unit 8) is provided outside the filament current path (third filament current path 9i3) through which the filament current flows, and in the middle of the filament current path (third filament current path 9i3). A detection unit (tube current detection unit 8) is connected, and a detection signal from the detection unit (tube current detection unit 8) is input to the current control means (tube current control circuit 3 and control circuit 1). Further, the current control means (tube current control circuit 3 and control circuit 1) controls the load circuit 2 to apply a high frequency lighting voltage between the filaments (between Fm1a and Fm1b, between Fm2a and Fm2b), and The frequency of the high-frequency lighting voltage is controlled so that the tube current is constant based on the fluctuation of the detection signal detected by the detection unit (tube current detection unit 8).

この構成によれば、放電灯（第１，第２放電灯Ｄｔ１，Ｄｔ２）内に管電流を流して、放電灯（第１，第２放電灯Ｄｔ１，Ｄｔ２）を点灯させるようにすることができるので、ダイオードＤ２と抵抗Ｒ３との間に生ずる管電流のみによる半波電圧を管電流検出手段（管電流検出部８）で検出することができる。これにより、放電灯（第１，第２放電灯Ｄｔ１，Ｄｔ２）内に流れる管電流のみに基づいて、放電灯（第１，第２放電灯Ｄｔ１，Ｄｔ２）内を流れる管電流が一定の所定値（目標値）となるように、電流制御手段（管電流制御回路３及び制御回路１）により負荷回路２を制御できる。この結果、管電流以外の電流量に影響されること無く、大型化せずに、安価な部品を使用し、所定の管電流になるよう制御できる。   According to this configuration, it is possible to turn on the discharge lamps (first and second discharge lamps Dt1 and Dt2) by flowing a tube current through the discharge lamps (first and second discharge lamps Dt1 and Dt2). Therefore, the half-wave voltage due to only the tube current generated between the diode D2 and the resistor R3 can be detected by the tube current detection means (tube current detection unit 8). As a result, the tube current flowing in the discharge lamp (first and second discharge lamps Dt1, Dt2) is based on only the tube current flowing in the discharge lamp (first and second discharge lamps Dt1, Dt2). The load circuit 2 can be controlled by the current control means (tube current control circuit 3 and control circuit 1) so that the value (target value) is obtained. As a result, it is possible to control to obtain a predetermined tube current by using inexpensive parts without being increased in size without being influenced by the amount of current other than the tube current.

また、この発明の実施の形態の放電灯点灯装置において、前記放電灯（第１，第２放電灯Ｄｔ１，Ｄｔ２）は２つ設けられている。尚、上述した実施例では、第１，第２放電灯Ｄｔ１，Ｄｔ２の２つが設けられているが、必ずしもこれに限定されるものではない。例えば、放電灯は、第１，第２放電灯Ｄｔ１，Ｄｔ２の一方のみでも良いし、３以上設けられていても良い。また、放電灯を複数（２以上）設ける場合には、図１に示したように複数の放電灯が直列に接続された状態で放電電流が直列で流れるようにすると良いが、必ずしもこれに限定されるものではない。   In the discharge lamp lighting device according to the embodiment of the present invention, two discharge lamps (first and second discharge lamps Dt1, Dt2) are provided. In the above-described embodiment, the first and second discharge lamps Dt1 and Dt2 are provided. However, the present invention is not necessarily limited to this. For example, only one of the first and second discharge lamps Dt1 and Dt2 may be provided, or three or more discharge lamps may be provided. In addition, when a plurality of (two or more) discharge lamps are provided, the discharge current may flow in series with a plurality of discharge lamps connected in series as shown in FIG. Is not to be done.

更に、この発明の実施の形態の放電灯点灯装置において、前記電流制御手段（管電流制御回路３及び制御回路１）は駆動回路４でＯＮ・ＯＦＦ制御されて高周波交流を発生させるスイッチング素子（TR1,TR2）及び前記検出信号が入力される管電流制御回路３を備えている。しかも、前記管電流制御回路３は、前記スイッチング素子の動作制御開始時に前記所定の共振周波数の高周波交流を前記予熱用共振回路（予熱回路９）に供給して前記予熱共振回路（予熱回路９）を共振させることにより、前記フィラメント電流を流して前記フィラメント（Ｆｍ１ａ，Ｆｍ１ｂ、Ｆｍ２ａ，Ｆｍ２ｂ）を発熱させ予熱した後、前記スイッチング素子（TR1,TR2）を動作制御して前記高周波交流の前記共振周波数をずらすことにより前記点灯交流用共振回路を共振させて、前記フィラメント間（Ｆｍ１ａ，Ｆｍ１ｂ間、Ｆｍ２ａ，Ｆｍ２ｂ間）に高周波点灯電圧を印加して、且つ前記電流検出部８で検出される電圧の変動に基づき前記管電流が一定となるように前記スイッチング素子（TR1,TR2）により前記高周波点灯電圧の周波数を制御するようになっている。   Furthermore, in the discharge lamp lighting device according to the embodiment of the present invention, the current control means (tube current control circuit 3 and control circuit 1) is ON / OFF controlled by the drive circuit 4 to generate a high-frequency alternating current (TR1). , TR2) and a tube current control circuit 3 to which the detection signal is input. Moreover, the tube current control circuit 3 supplies the preheating resonance circuit (preheating circuit 9) with the high frequency alternating current having the predetermined resonance frequency at the start of the operation control of the switching element, so that the preheating resonance circuit (preheating circuit 9). The filament current (Fm1a, Fm1b, Fm2a, Fm2b) is heated and preheated to control the switching elements (TR1, TR2) and control the operation of the high-frequency alternating current. The high frequency lighting voltage is applied between the filaments (between Fm1a and Fm1b, between Fm2a and Fm2b) by resonating the lighting AC resonance circuit, and the voltage detected by the current detection unit 8 The frequency of the high-frequency lighting voltage by the switching elements (TR1, TR2) so that the tube current becomes constant based on fluctuations. It is adapted to control.

この構成によれば、簡単な構成で放電灯（第１，第２放電灯Ｄｔ１，Ｄｔ２）を点灯させて、放電灯（第１，第２放電灯Ｄｔ１，Ｄｔ２）の点灯時の管電流のみを検出するようにできる。   According to this configuration, the discharge lamps (first and second discharge lamps Dt1 and Dt2) are turned on with a simple configuration, and only the tube current when the discharge lamps (first and second discharge lamps Dt1 and Dt2) are turned on. Can be detected.

また、この発明の実施の形態の放電灯点灯装置において、前記負荷回路２は前記高周波交流が供給される一次巻線及び前記一次巻線（一次コイルＬ１）に磁気結合された二次巻線（二次コイルＬ２ａ〜Ｌ２ｃ）が設けられたトランスＴ１を備えている。更に、前記点灯交流用共振回路は前記一次巻線（一次コイルＬ１）を備え、前記予熱用共振回路は前記二次巻線（二次コイルＬ２ａ〜Ｌ２ｃ）を備えている。   In the discharge lamp lighting device according to the embodiment of the present invention, the load circuit 2 includes a primary winding to which the high-frequency alternating current is supplied and a secondary winding magnetically coupled to the primary winding (primary coil L1). A transformer T1 provided with secondary coils L2a to L2c) is provided. Further, the lighting AC resonance circuit includes the primary winding (primary coil L1), and the preheating resonance circuit includes the secondary winding (secondary coils L2a to L2c).

この構成によれば、制御回路１から負荷回路２に供給される高周波電流の周波数のみの制御により、負荷回路２のフィラメント電流経路に供給するフィラメント電流（予熱電流）を制御して、放電灯（第１，第２放電灯Ｄｔ１，Ｄｔ２）の点灯時の管電流のみを検出できるので、放電灯（第１，第２放電灯Ｄｔ１，Ｄｔ２）内を流れる管電流が一定の所定値（目標値）となる制御が容易である。   According to this configuration, by controlling only the frequency of the high-frequency current supplied from the control circuit 1 to the load circuit 2, the filament current (preheating current) supplied to the filament current path of the load circuit 2 is controlled, and the discharge lamp ( Since only the tube current at the time of lighting of the first and second discharge lamps Dt1, Dt2) can be detected, the tube current flowing in the discharge lamp (first, second discharge lamps Dt1, Dt2) has a predetermined value (target value). Is easy to control.

１・・・制御回路（高周波交流発生手段、電流制御手段の一部）
２・・・負荷回路
３・・・管電流制御回路（電流制御手段の一部）
４・・・駆動回路
８・・・管電流検出部（管電流検出手段）
９・・・予熱回路（予熱用共振回路）
９ｉ１・・・第１フィラメント電流経路
９ｉ２・・・第２フィラメント電流経路
９ｉ３・・・第３フィラメント電流経路
１１ 平滑回路
Ｃ１，Ｃ７・・・コンデンサ（点灯交流用共振回路の一部）
Ｄｔ１・・・第１放電灯（放電灯）
Ｄｔ２・・・第２放電灯（放電灯）
Ｅ１・・・直流電源
Ｆｍ１ａ・・・フィラメント
Ｆｍ１ｂ・・・フィラメント
Ｆｍ２ａ・・・フィラメント
Ｆｍ２ｂ・・・フィラメント
Ｌ１・・・一次コイル（点灯交流用共振回路の一部）
Ｌ２ａ・・・二次コイル
Ｌ２ｂ・・・二次コイル
Ｌ２ｃ・・・二次コイル
Ｒ３ 抵抗
Ｔ１ トランス
ＴＲ１ スイッチング素子
ＴＲ２ スイッチング素子 1 ... control circuit (high frequency AC generating means, part of current control means)
2 ... Load circuit 3 ... Tube current control circuit (part of current control means)
4 ... Drive circuit 8 ... Tube current detector (Tube current detector)
9 ... Preheating circuit (Preheating resonance circuit)
9i1 ... 1st filament current path 9i2 ... 2nd filament current path 9i3 ... 3rd filament current path 11 Smoothing circuit C1, C7 ... Capacitor (part of lighting resonance circuit)
Dt1 ... 1st discharge lamp (discharge lamp)
Dt2 ... Second discharge lamp (discharge lamp)
E1 ... DC power supply Fm1a ... filament Fm1b ... filament Fm2a ... filament Fm2b ... filament L1 ... primary coil (part of lighting AC resonance circuit)
L2a ... Secondary coil L2b ... Secondary coil L2c ... Secondary coil R3 Resistance T1 Transformer TR1 Switching element TR2 Switching element

Claims (4)

放電灯のフィラメント間にフィラメント電流を流して前記フィラメントを予熱可能に且つ前記フィラメン間に高周波点灯電圧を印加可能に設けられた負荷回路と、
前記負荷回路に高周波交流を供給して、前記フィラメント電流を流すことにより前記フィラメントを予熱させた後に、前記フィラメント間に前記高周波点灯電圧を印加して前記放電灯に管電流を流す高周波発生手段と、
前記放電灯に流れる管電流を検出させる管電流検出手段と、
前記管電流検出手段の検出結果に基づいて前記放電灯に流れる電流が所定の管電流になるように前記高周波交流を制御する電流制御手段と、
を備えた放電灯点灯装置であって、
前記管電流検出手段は前記フィラメント電流の流れるフィラメント電流経路外に設けられ且つ前記フィラメント電流経路途中に接続された検出部であり、前記検出部からの検出信号が前記電流制御手段に入力されると共に、
前記電流制御手段は、前記負荷回路を制御して前記フィラメント間に高周波点灯電圧を印加して、前記検出部で検出される検出信号の変動に基づき前記管電流が所定の値となるように前記高周波点灯電圧の周波数を制御することを特徴とする放電灯点灯装置。 A load circuit provided to allow a filament current to flow between the filaments of the discharge lamp so as to preheat the filament and to apply a high-frequency lighting voltage between the filaments;
High-frequency generating means for supplying a high-frequency alternating current to the load circuit and preheating the filament by flowing the filament current, and then applying the high-frequency lighting voltage between the filaments to flow a tube current to the discharge lamp; ,
Tube current detection means for detecting a tube current flowing through the discharge lamp;
Current control means for controlling the high-frequency alternating current so that a current flowing through the discharge lamp becomes a predetermined tube current based on a detection result of the tube current detection means;
A discharge lamp lighting device comprising:
The tube current detection unit is a detection unit provided outside the filament current path through which the filament current flows and connected in the middle of the filament current path, and a detection signal from the detection unit is input to the current control unit. ,
The current control means controls the load circuit to apply a high-frequency lighting voltage between the filaments, so that the tube current becomes a predetermined value based on a change in a detection signal detected by the detection unit. A discharge lamp lighting device that controls the frequency of a high-frequency lighting voltage. 請求項１に記載の放電灯点灯装置において、前記放電灯は１又は2以上設けられていることを特徴とする放電灯点灯装置。   The discharge lamp lighting device according to claim 1, wherein one or two or more of the discharge lamps are provided. 請求項１又は２に記載の放電灯点灯装置において、前記電流制御手段は駆動回路でＯＮ・ＯＦＦ制御されて高周波交流を発生させるスイッチング素子及び前記検出信号が入力される管電流制御回路を備え、前記管電流制御回路は、前記スイッチング素子の動作制御開始時に前記所定の共振周波数の高周波交流を前記予熱用共振回路に供給して前記予熱共振回路を共振させることにより、前記フィラメント電流を流して前記フィラメントを発熱させ予熱した後、前記スイッチング素子を動作制御して前記高周波交流の前記共振周波数をずらすことにより前記点灯交流用共振回路を共振させて、前記フィラメント間に高周波点灯電圧を印加して、且つ前記電流検出部で検出される電圧の変動に基づき前記管電流が一定となるように前記スイッチング素子により前記高周波点灯電圧の周波数を制御することを特徴とする放電灯点灯装置。   The discharge lamp lighting device according to claim 1 or 2, wherein the current control means includes a switching element that is ON / OFF controlled by a drive circuit to generate high-frequency alternating current, and a tube current control circuit to which the detection signal is input, The tube current control circuit supplies the high-frequency alternating current of the predetermined resonance frequency to the preheating resonance circuit at the start of operation control of the switching element to resonate the preheating resonance circuit, thereby causing the filament current to flow. After heating and preheating the filament, resonating the lighting alternating current resonance circuit by shifting the resonance frequency of the high frequency alternating current by controlling the operation of the switching element, and applying a high frequency lighting voltage between the filaments, In addition, the switching current is set so that the tube current becomes constant based on the fluctuation of the voltage detected by the current detection unit. The discharge lamp lighting device and controls the frequency of the high frequency ignition voltage by the element. 請求項３に記載の放電灯点灯装置において、前記負荷回路は前記高周波交流が供給される一次巻線及び前記一次巻線に磁気結合された二次巻線が設けられたトランスを備えていると共に、前記点灯交流用共振回路は前記一次巻線を備え、前記予熱用共振回路は前記二次巻線を備えることを特徴とする放電灯点灯装置。   4. The discharge lamp lighting device according to claim 3, wherein the load circuit includes a transformer provided with a primary winding to which the high-frequency alternating current is supplied and a secondary winding magnetically coupled to the primary winding. The lighting alternating current resonance circuit includes the primary winding, and the preheating resonance circuit includes the secondary winding.
JP2010050740A 2010-03-08 2010-03-08 Discharge lamp lighting device Pending JP2011187294A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003059679A (en) * 2001-08-09 2003-02-28 Matsushita Electric Ind Co Ltd Discharge lamp lighting device
WO2008102703A1 (en) * 2007-02-19 2008-08-28 Panasonic Electric Works Co., Ltd. Discharge lamp operation device, illumination device, and liquid crystal display device
JP2009289555A (en) * 2008-05-28 2009-12-10 Toshiba Lighting & Technology Corp Discharge lamp lighting device, and luminaire

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003059679A (en) * 2001-08-09 2003-02-28 Matsushita Electric Ind Co Ltd Discharge lamp lighting device
WO2008102703A1 (en) * 2007-02-19 2008-08-28 Panasonic Electric Works Co., Ltd. Discharge lamp operation device, illumination device, and liquid crystal display device
JP2009289555A (en) * 2008-05-28 2009-12-10 Toshiba Lighting & Technology Corp Discharge lamp lighting device, and luminaire

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