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JPS5916719B2 - discharge lamp starting device - Google Patents

discharge lamp starting device

Info

Publication number
JPS5916719B2
JPS5916719B2 JP11111375A JP11111375A JPS5916719B2 JP S5916719 B2 JPS5916719 B2 JP S5916719B2 JP 11111375 A JP11111375 A JP 11111375A JP 11111375 A JP11111375 A JP 11111375A JP S5916719 B2 JPS5916719 B2 JP S5916719B2
Authority
JP
Japan
Prior art keywords
voltage
thyristor
circuit
discharge lamp
discharge lamps
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
Application number
JP11111375A
Other languages
Japanese (ja)
Other versions
JPS5235481A (en
Inventor
成伍 高橋
孝一郎 谷河
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP11111375A priority Critical patent/JPS5916719B2/en
Publication of JPS5235481A publication Critical patent/JPS5235481A/en
Publication of JPS5916719B2 publication Critical patent/JPS5916719B2/en
Expired legal-status Critical Current

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Description

【発明の詳細な説明】 本発明は放電灯始動装置に関するものであり、その目的
とするところは回路構成を簡略化し安価とした放電灯始
動装置を提供するにある。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a discharge lamp starting device, and an object thereof is to provide a discharge lamp starting device that has a simplified circuit configuration and is inexpensive.

一般に放電灯F1、F2を起動点灯するためには放電灯
フィラメントを予熱し、さらに放電灯電0 極間に高電
圧を印加する必要がある。
Generally, in order to start and light the discharge lamps F1 and F2, it is necessary to preheat the discharge lamp filament and further apply a high voltage between the discharge lamp electrodes.

そこで従来、複数個直列接続された放電灯F、、F、を
起動点灯する装置として、放電灯F、、F2の点灯に到
るまでの期間における電源電圧の半サイクルに放電灯電
極間に高圧パルス電圧を発生する高圧パル・5 ス電圧
発生回路PCを設けるとともに、他の半サイクルに放電
灯フィラメントに予熱電流を供給する予熱電流通電用サ
イリスタQhl、Qh2及び該サイリスタQhl、Qh
2を制御する予熱制御回路PHCを複数個直列接続され
た放電灯F1、i0F2の各々の放電灯F1、F2に並
列に接続して構成される放電灯始動装置が提供されてい
る。ところがかかる従来例装置では複数個直列接続され
た放電灯の数に相当した複数個の予熱制御回路PHCを
必要とするという欠点を有していた。即j5ち今説明の
簡単の為2灯直列の場合を示す第5図従来例の構成につ
いて説明する。安定器Lと直列に接続した直列2灯放電
灯F、、F2の一方の放電灯F1の非電源側フィラメン
ト端子fl、3f、2間にサイリスタQh、(例えばS
CR)及び、抵■0 抗Ralに抵抗Rblとコンデン
サCb、との並列回路を直列接続した回路を接続し、直
列抵抗Ral、Rblの接続点とフィラメント端子f、
2との間にトランジスタTrlのベースと定電圧素子Z
DI(例えばツェナーダイオード)のアノー35ドを直
列接続した回路を設け、該回路をトランジスタTrlの
エミッタが抵抗Ra、と抵抗Rblとの接続点に、定電
圧素子ZD1のカソードがフを、イラメント端子Fl2
に夫々接続されるように接続し、さらにトランジスタT
r,のコレクタとフイラメント端子F,2との間に抵抗
Rq,を接続するとともに、トランジスタTrlのコレ
クタと抵抗Rqlとの接続点と、サイリスタQh,のゲ
ートとの間にコンデンサCq,を接続し、コンデンサC
qlとサイリスタQh,のゲートとの接続点と、フイラ
メント端子F,2との間にサイリスタQhlと逆方向に
導通するダイオードD1を接続したものからなる予熱制
御回路PHClを設ける。
Therefore, conventionally, as a device for starting and lighting multiple discharge lamps F, F, connected in series, a high voltage is applied between the discharge lamp electrodes during a half cycle of the power supply voltage during the period up to lighting of the discharge lamps F, F2. A high-voltage pulse voltage generation circuit PC that generates a pulse voltage is provided, and preheating current energizing thyristors Qhl, Qh2 and the thyristors Qhl, Qh supply preheating current to the discharge lamp filament in the other half cycle.
A discharge lamp starting device is provided in which a plurality of series-connected discharge lamps F1 and i0F2 are connected in parallel to each of the discharge lamps F1 and F2, respectively, and a preheating control circuit PHC for controlling the preheating control circuit PHC. However, such a conventional device has a drawback in that it requires a plurality of preheating control circuits PHC corresponding to the number of discharge lamps connected in series. For the sake of simplicity, the configuration of a conventional example shown in FIG. 5, which shows a case where two lamps are connected in series, will now be described. A thyristor Qh (for example, S
CR) and resistor 0. A circuit in which a parallel circuit of a resistor Rbl and a capacitor Cb is connected in series is connected to the resistor Ral, and the connection point of the series resistors Ral and Rbl is connected to the filament terminal f,
2 and the base of the transistor Trl and the constant voltage element Z
A circuit is provided in which the anode 35 of a DI (for example, a Zener diode) is connected in series, and the emitter of the transistor Trl is connected to the connection point between the resistor Ra and the resistor Rbl, the cathode of the constant voltage element ZD1 is connected to the illumination terminal Fl2
The transistors T
A resistor Rq, is connected between the collector of the transistor Trl and the filament terminal F,2, and a capacitor Cq, is connected between the connection point between the collector of the transistor Trl and the resistor Rql, and the gate of the thyristor Qh. , capacitor C
A preheating control circuit PHCl is provided between a connection point between thyristor Qhl and the gate of thyristor Qh, and a filament terminal F, 2, which includes a diode D1 connected in the opposite direction to that of thyristor Qhl.

また同じく放電灯F2の非電源側のフイラメント端子F
2,,f22間に、サイリスタQhlと同方向に導”通
するサイリスタQh2、及び予熱制御回路PHC,と全
く同様の構成からなる予熱制御回路PHC2を接続する
。さらに非電源側のフイラメント端子Fll,f22間
に抵抗Rgと抵抗Rtとの直列回路を接続するとともに
、コンデンサCpと抵抗Rdとの並列回路を予熱制御回
路PHC,,PHC2のサイリスタQhl,Qh2と逆
方向に導通するサイリスタQp(例えばSCR)に直列
接続した直並列回路を上記フイラメント端子Fll,f
22間に接続し、直列抵抗Rg,Rtの接続点にサイリ
スタQpのゲートを接続して高圧パルス発生回路PCが
構成されている。次に上記第5図従来例の動作を説明す
る。
Similarly, filament terminal F on the non-power side of discharge lamp F2
A preheating control circuit PHC2 having the same configuration as the thyristor Qh2, which conducts in the same direction as the thyristor Qhl, and the preheating control circuit PHC is connected between the filament terminals Fll and Fll on the non-power supply side. A series circuit of a resistor Rg and a resistor Rt is connected between f22, and a parallel circuit of a capacitor Cp and a resistor Rd is connected to a thyristor Qp (for example, an SCR ) are connected in series to the above filament terminals Fll, f.
A high voltage pulse generating circuit PC is constructed by connecting the gate of the thyristor Qp to the connection point between the series resistors Rg and Rt. Next, the operation of the conventional example shown in FIG. 5 will be explained.

先ず予熱制御回路PHCl及びPHC2について説明す
る。電源Eの電圧の負の半サイクルの電圧が予熱制御回
路PHCl及びPHC2の両端に印加されると、抵抗R
a,,Ra2及び抵抗Rbl,Rb2とコンデンサCb
l,Cb2との直並列回路で構成された分圧平滑回路の
出力端には抵抗Rbl,Rb2の分担電圧が発生し、定
電圧素子ZDl,ZD2を介してトランジスタTrl,
Tr2のベースに電流が供給されトランジスタTrl,
Tr2が導通する。ここでトランジスタTrl,Tr2
のベース・エミツタ問には分圧平滑回路の抵抗Rbl,
Rb2の分担電圧と定電圧素子ZDl,ZD2のツエナ
一電圧との差の電圧が印加される。従つて分圧平滑回路
の分担電圧が定電圧素子ZDl,ZD2のツエナ一電圧
よりも絶対値力吠きい時にはトランジスタTr,,Tr
2にベース電流が供給されトランジスタTr,,Tr2
は導通する。トランジスタTrl,Tr,が導通すると
ダイオードD,,D2からコンデンサCq,,Cq2、
トランジスタTrl,Tr2、抵抗Ra,,Ra2を介
してコンデンサCq,,Cq2に充電々流が流れ、該コ
ンデンサCq,,Cq2が充電される。次に電源電圧が
正の電圧に反転すると、コンデンサCq,,Cq2に充
電された電荷はコンデンサCq,,Cq2からサイリス
タQhl,Qh2のゲート・カソード、抵抗Rq,,R
q2を介して放電され、この放電々流がサイリスタQh
l,Qh2のゲート点弧電流としてサイリスタQh,,
Qh2のゲートに供給されると同時にサイリスタQhl
,Qh2は順方向に電圧が印加されている為にサイリス
タQhl,Qh2は点弧導通し、電源Eから安定器L、
フイラメント端子F,l、サイリスタQh,、フイラメ
ント端子Fl2、フイラメント端子F2l、サイリスタ
Qh2、フイラメント端子F22を介しだ放電灯Fl,
F2のフイラメントに予熱電流が流れ、フイラメントが
加熱される。この状態を繰返して予熱電流を供給し続け
ると、やがて予熱の進行に伴ない、電源Eの電圧の負の
半サイクルで高圧パルス電圧発生回路PCにより発生さ
れた高圧パルス電圧により、このサイクルで、放電灯F
l,F2は始動を開始する。放電灯F,,F2が始動を
開始すると、予熱制御回路PHCl,PHC2には放電
灯点灯電圧が印加されるが、この電圧は一般に電源電圧
最大値よりも低くなるため、前記分圧平滑回路の抵抗R
b,,Rb2の分担電圧は低下し、ついにこの分圧平滑
回路の分担電圧は定電圧素子ZD,,ZD2のツエナ一
電圧よりも低くなり、定電圧素子ZDl,ZD2は導通
しなくなり、トランジスタTrl,Tr2にペース電流
が供給されなくなるため該トランジスタTr,,Tr2
は遮断する。従つてダイオードDl,D2からコンデン
サCql,Cq2、トランジスタTrl,Tr2、抵抗
Ral,Ra2を介してのコンデンサCq,,Cq2充
電径路がなくなり、コンデンサCql,Cq2には充電
々荷が供給されなくなる。この時以後コンデンサCql
,Cq2の充電電荷が減少し、コンデンサCql,Cq
2の充電電荷が放電完了してサイリスタQhl,Qh2
のゲート点弧電流が供給されなくなると、サイリスタQ
hl,Qh2が点弧導通しなくなり、予熱電流は遮断さ
れる。かくて予熱電流が遮断されると、放電灯Fl,F
2には正の半サイクルの電源電圧が印加されるが、安定
器Lのインダクタンスによる電源電圧に対する放電灯点
灯電圧の位相遅れのため、上記の予熱電流遮断時に放電
灯に印加される正の半サイクルの電源電圧は波高値付近
の値となつており、この電圧によつて放電灯Fl,F2
は正の半サイクルにも放電を開始し、正負両サイクルと
も点灯状態に移行する。次に始動用の高圧パルス電圧発
生回路PCの動作を説明する。
First, the preheating control circuits PHCl and PHC2 will be explained. When the voltage of the negative half cycle of the voltage of the power supply E is applied across the preheating control circuits PHCl and PHC2, the resistor R
a,, Ra2 and resistors Rbl, Rb2 and capacitor Cb
A voltage shared by the resistors Rbl and Rb2 is generated at the output end of the voltage dividing smoothing circuit configured with a series-parallel circuit with the transistors Trl and Cb2, and the voltage is applied to the transistors Trl and Trl through the constant voltage elements ZDl and ZD2, respectively.
A current is supplied to the base of Tr2, and the transistors Trl,
Tr2 becomes conductive. Here, transistors Trl and Tr2
The resistance Rbl of the voltage dividing smoothing circuit is installed between the base and emitter of
A voltage that is the difference between the shared voltage of Rb2 and the Zener voltage of constant voltage elements ZDl and ZD2 is applied. Therefore, when the shared voltage of the voltage dividing and smoothing circuit is higher in absolute value than the voltage of the constant voltage elements ZDl and ZD2, the transistors Tr, Tr
The base current is supplied to transistors Tr, Tr2.
is conductive. When the transistors Trl, Tr, conduct, the capacitors Cq,, Cq2, from the diodes D,, D2,
A charging current flows to the capacitors Cq, , Cq2 via the transistors Trl, Tr2 and the resistors Ra, , Ra2, and the capacitors Cq, , Cq2 are charged. Next, when the power supply voltage is reversed to a positive voltage, the charge stored in the capacitors Cq, , Cq2 is transferred from the capacitors Cq, , Cq2 to the gates and cathodes of the thyristors Qhl and Qh2, and the resistors Rq, , R
is discharged via q2, and this discharge current flows through the thyristor Qh.
Thyristor Qh, , as the gate firing current of l, Qh2.
At the same time, the thyristor Qhl is supplied to the gate of Qh2.
, Qh2 are applied with voltage in the forward direction, so the thyristors Qhl and Qh2 are ignited and conductive, and from the power source E to the ballast L,
Discharge lamp Fl, through filament terminals F, l, thyristor Qh, filament terminal Fl2, filament terminal F2l, thyristor Qh2, filament terminal F22.
A preheating current flows through the filament of F2, and the filament is heated. If this state is repeated and the preheating current is continued to be supplied, as the preheating progresses, the high voltage pulse voltage generated by the high voltage pulse voltage generation circuit PC in the negative half cycle of the voltage of the power supply E will cause, in this cycle, Discharge lamp F
l, F2 starts the start. When the discharge lamps F, F2 start, the discharge lamp lighting voltage is applied to the preheating control circuits PHCl and PHC2, but since this voltage is generally lower than the maximum power supply voltage, the voltage dividing smoothing circuit Resistance R
The shared voltage of b, , Rb2 decreases, and finally the shared voltage of this voltage dividing smoothing circuit becomes lower than the Zener voltage of constant voltage elements ZD, , ZD2, constant voltage elements ZDl, ZD2 are no longer conductive, and transistor Trl , Tr2 because the pace current is no longer supplied to the transistors Tr, , Tr2
is blocked. Therefore, there is no charging path for the capacitors Cq, Cq2 from the diodes Dl, D2 via the capacitors Cql, Cq2, the transistors Trl, Tr2, and the resistors Ral, Ra2, and no charge is supplied to the capacitors Cql, Cq2. After this time, capacitor Cql
, Cq2 decreases, and the capacitors Cql, Cq
After the discharge of the charged charges of 2 is completed, the thyristors Qhl and Qh2
When the gate firing current is no longer supplied, the thyristor Q
hl and Qh2 are no longer ignited and the preheating current is cut off. Thus, when the preheating current is cut off, the discharge lamps Fl, F
2, a positive half-cycle power supply voltage is applied, but due to the phase lag of the discharge lamp lighting voltage with respect to the power supply voltage due to the inductance of the ballast L, the positive half-cycle power supply voltage applied to the discharge lamp when the preheating current is cut off is The cycle power supply voltage has a value near the peak value, and this voltage causes the discharge lamps Fl and F2 to
starts discharging in the positive half cycle as well, and transitions to the lighting state in both the positive and negative cycles. Next, the operation of the high voltage pulse voltage generating circuit PC for starting will be explained.

放電灯Fl,F2の未点灯時において電源Eの電圧の正
の半サイクルに予熱回路の働きにより予熱電流が流れる
が、安定器Lのインダクタンスによる位相遅れの為に電
源Eの電圧の位相が正から負に反転する時刻以後も予熱
電流は流れ続ける。やがて予熱電流がサイリスタQhl
,Qh2の保持電流以下になりサイリスタQh,,Qh
2が遮断されるが、この時点で既に負の最大値付近の値
になつている電源Eの電圧が高圧パルス電圧発生回路P
Cの両端に印加される。この電源Eの電圧の抵抗Rg,
Rtによる分圧で、抵抗Rgの両端には分担電圧が発生
しサイリスタQpにゲート点弧電流が供給されサイリス
タQpは点弧導通してコンデンサCpが充電される。コ
ンデンサCpの充電々荷が増加しコンデンサCpの端子
電圧が上昇してサイリスタQpのゲート・カソード間が
逆バイアスされてカソードからゲートに逆電流が流れ、
あるところでサイリスタQpはターンオフされてコンデ
ンサCpの充電々流は急速に遮断されるために点灯回路
の安定器Lのインダクタンスに発生するLdi/Dtの
高圧パルス電圧が放電灯Fl,F2のフイラメント電極
間に印加される。かくて正負両サイクル共点灯状態に移
行すると予熱制御回路PHCl,PHC2には放電灯F
l,F2の点灯電圧が、高圧パルス電圧発生回路PCに
は放電灯F1とF2の点灯電圧の和の電圧が夫々印加さ
れるが、予熱制御回路PHCl,PHC2に設けた分圧
平滑回路の抵抗Rb,,Rb2の分担電圧が放電灯Fl
,F2の点灯時において定電圧素子ZDl,ZD2のツ
エナ一電圧より低くなるように選んでおくことにより、
予熱電流は遮断状態を保ち、又高圧パルス電圧発生回路
PCの抵抗Rg,Rtの分圧比を放電灯Fl,F2の点
灯電圧の和による抵抗Rgの分担電圧ではサイリスタQ
pが点弧導通しないように選んでおけば、高圧パルス電
圧は発生されず放電灯FlF2は点灯状態を持続するの
である。ところがかかる従来例装置では、複数個直列故
電灯の各々の放電灯Fl,F2に対して夫々予熱制御回
路PHCl,PHC2が必要となり複数個直列接続され
る放電灯の個数が増加すると予熱制御回路の個数も増加
するという欠点があつた。本発明は上述の点に鑑みて提
供せるものであつて、以下本発明の一実施例を図面によ
り詳細に説明する。
When the discharge lamps Fl and F2 are not lit, a preheating current flows in the positive half cycle of the voltage of the power source E due to the function of the preheating circuit, but due to the phase delay due to the inductance of the ballast L, the phase of the voltage of the power source E is not correct. The preheating current continues to flow even after the time when the current changes to negative. Eventually, the preheating current reaches the thyristor Qhl.
, Qh2 becomes lower than the holding current of thyristor Qh, , Qh
2 is cut off, but at this point the voltage of the power supply E, which has already reached a value near the negative maximum value, reaches the high voltage pulse voltage generation circuit P.
applied to both ends of C. Resistance Rg of the voltage of this power supply E,
Due to the voltage division by Rt, a shared voltage is generated across the resistor Rg, and a gate firing current is supplied to the thyristor Qp, causing the thyristor Qp to conduct firing and charging the capacitor Cp. The charge on the capacitor Cp increases, the terminal voltage of the capacitor Cp rises, the gate and cathode of the thyristor Qp are reverse biased, and a reverse current flows from the cathode to the gate.
At a certain point, the thyristor Qp is turned off and the charging current of the capacitor Cp is rapidly cut off, so that the high voltage pulse voltage Ldi/Dt generated in the inductance of the ballast L of the lighting circuit is applied between the filament electrodes of the discharge lamps Fl and F2. is applied to In this way, when both the positive and negative cycles are turned on, the discharge lamp F is input to the preheating control circuits PHCl and PHC2.
The lighting voltages of F1 and F2 are the sum of the lighting voltages of discharge lamps F1 and F2, which is applied to the high-voltage pulse voltage generation circuit PC, respectively. The shared voltage of Rb, , Rb2 is the discharge lamp Fl
, by selecting the voltage to be lower than the Zener voltage of constant voltage elements ZDl and ZD2 when F2 is lit.
The preheating current is maintained in a cut-off state, and the voltage division ratio of the resistors Rg and Rt of the high-voltage pulse voltage generating circuit PC is set to the shared voltage of the resistor Rg based on the sum of the lighting voltages of the discharge lamps Fl and F2, so that the thyristor Q
If p is selected so as not to conduct ignition, no high voltage pulse voltage is generated and the discharge lamp FIF2 continues to be lit. However, in such a conventional device, preheating control circuits PHCl and PHC2 are required for each discharge lamp Fl and F2 of a plurality of failed electric lamps connected in series, and as the number of discharge lamps connected in series increases, the preheating control circuit becomes The disadvantage was that the number of pieces also increased. The present invention has been provided in view of the above points, and one embodiment of the present invention will be described in detail below with reference to the drawings.

第1図は放電灯Fl,F2を2灯直列とした本発明の一
実施例回路を示す。安定器Lと直列に接続した直列2灯
の放電灯Fl,F2において、低電位側の放電灯F2の
非電源側フイラメント端子F2l,f22間にサイリス
タQh2(例えばSCR)と前記従来例と同じ構成から
なる予熱制御回路PHCとを接続し、他方の放電灯F1
のフイラメント端子Fl,,fl2間にサイリスタQh
l(例えばSCR)と抵抗RCとの並列回路を接続し、
該サイリスタQhlのゲートとアノードとの間に抵抗R
A、ゲートと放電灯F2側のサイリスタQh2のカソー
ド端子との間には抵抗RBを接続した従属予熱制御回路
DHCを接続し、フイラメント端子F,l,f22間に
従来例と同じ構成からなる高圧パルス電圧発生回路PC
を接続して構成されている。次に上記第1図実施例回路
の動作について説明する。
FIG. 1 shows a circuit according to an embodiment of the present invention in which two discharge lamps Fl and F2 are connected in series. In the two series discharge lamps Fl and F2 connected in series with the ballast L, a thyristor Qh2 (for example, SCR) is installed between the non-power supply side filament terminals F2l and f22 of the discharge lamp F2 on the low potential side, and the same configuration as in the conventional example. The other discharge lamp F1 is connected to the preheating control circuit PHC consisting of
A thyristor Qh is connected between the filament terminals Fl, , fl2 of
Connect a parallel circuit of l (for example SCR) and resistor RC,
A resistor R is connected between the gate and anode of the thyristor Qhl.
A. A dependent preheating control circuit DHC with a resistor RB connected between the gate and the cathode terminal of the thyristor Qh2 on the side of the discharge lamp F2 is connected, and a high voltage circuit having the same configuration as the conventional example is connected between the filament terminals F, l, and f22. Pulse voltage generation circuit PC
It is configured by connecting. Next, the operation of the circuit according to the embodiment shown in FIG. 1 will be explained.

まず高圧パルス電圧発生回路PCの動作及び予熱制御回
路PHCの動作は前記従来例と同じである。そこで従属
予熱制御回路DHCの動作について説明すると、電源E
の電圧の正の半サイクルにおいて直列2灯放電灯Fl,
F2の非電源側のフイラメント端子Fll,f22間に
電圧が印加されると、抵抗RC及び抵抗Raに抵抗Rb
とコンデンサCbとの並列回路を直列接続した分圧平滑
回路にて電圧が分担されると同時に、抵抗RA及び抵抗
RBにて同じく電圧が分担される。ここで抵抗RBの分
担電圧が分圧平渭回路の分担電圧及び放電灯F2の点灯
電圧より低くなるように設定する。電源Eの電圧の上昇
に従い分圧平滑回路の抵抗Rb両端電圧が上昇し、従来
例の予熱制御回路と同様の動作により、サイリスタQh
2にゲート点弧電流が供給されサイリスタQh2は点弧
導通する。一方サイリスタQh2が点弧導通すると放電
灯F2の非電源側のフイラメント端子F2l,f22間
電圧はサイリスタQh2のアノード・カリ−ド間飽和電
圧まで下降するため、サイリスタQhlのカソード電位
が下降し、サイリスタQhlのゲート電位即ち抵抗RB
の分担電圧の方がカソード電位より高くなり、サイリス
タQhlのゲート・カソード間は順方向にバイアスされ
ることとなつて、サイリスタQhlにゲート点弧電流が
供給され、サイリスタQhlも点弧導通し、電源Eから
安定器L、フイラメント端子F,l、サイリスタQhl
、フイラメント端子F,2、フイラメント端子F2,、
サイリスタQh2、フイラメント端子F22を介して放
電灯フイラメントに予熱電流が供給される。やがて予熱
の進行に伴ない高圧パルス電圧発生回路PCで発生する
高圧パルス電圧の供給と相まつて放電灯Fl,F2が電
源電圧の負の半サイクルで点灯を開始すると従来例と同
様の動作によりサイリスタQh2は点弧導通しなくなる
。サイリスタQh2が点弧導通しなくなると放電灯F2
の非電源側フイラメント端子F2l?F22間には分圧
平滑回路による電源電圧の分担電圧が出てくるため、サ
イリスタQh,のカソード電位がゲート電位より高くな
り、サイリスタQhlのゲート・カソード間は逆バイア
スされることになり、サイリスタQhlにゲート点弧電
流が供給されなくなりサイリスタQhlも点弧導通しな
くなる。即ちサイリスタQhl,Qh2とも導通しなく
なり予熱電流が遮断される。かくて予熱電流が遮断され
るとフイラメント端子Fl,,fl2間及びF2l9f
22間にはそれぞれ抵抗RC及びRa,Rb,Cbより
なる分圧平滑回路による電源Eの電圧の正の半サイクル
の分担電圧が印加されるが、電源電圧に対する放電灯点
灯電圧の位相遅れのため、予熱電流遮断時に放電灯に印
加される正の半サイクルの電源電圧は波高値付近の値に
なつており、抵抗RC及び分圧平滑回路による電源電圧
の分担電圧も波高値付近の値になつている。この電圧に
よつて放電灯Fl,F2は正の半サイクルも放電を開始
して、正負両サイクルとも点灯状態に移行する。かくて
正負両サイクルとも点灯状態に移行すると予熱制御回路
PHCには放電灯F2点灯電圧が、高圧パルス電圧発生
回路PC及び従属予熱制御回路DHCには放電灯F,と
F2の点灯電圧の和が夫々印加されるが、予熱制御回路
PHCの分圧平滑回路の抵抗Ra,Rb、コンデンサC
bの値を、放電灯F2点灯電圧の分圧平滑回路の抵抗R
b分担電圧が定電圧素子ZDのツエナ一電圧より低くな
るように設定し、従属予熱制御回路DHCの抵抗RA,
RBの値を、放電灯F1とF2の点灯電圧の和の抵抗R
Bによる分担電圧が放電灯F2点灯電圧より低くなるよ
うに設定すると、予熱電流は遮断状態を保ち、又、高圧
パルス電圧発生回路PCの抵抗Rg,Rtの分圧比を放
\電灯Fl,F2の点灯電圧の和による抵抗Rg分担電
圧ではサイリスタQpが点弧導通しないように選んでお
けば、高圧パルス電圧は発生されず放電灯は点灯状態を
持続するのである。このように本発明においては各々の
放電灯Fl,F2にそれぞれ予熱制御回路PHCを設け
る必要はなく、予熱制御回路PHCは一回路だけで他は
より回路構成の簡単な従属予熱制御回路DHCを設ける
だけでよく、回路構成が合理化される。なお上述におい
ては説明の簡単のために2灯直列の場合について説明し
たが、2灯以上の放電灯を直列接続した場合においても
、同様に本発明を応用できるものであつて、例えば4灯
を直列接続する場合は第2図のように構成すれば良い。
First, the operation of the high-voltage pulse voltage generation circuit PC and the operation of the preheating control circuit PHC are the same as in the conventional example. Therefore, to explain the operation of the dependent preheating control circuit DHC, the power supply E
In the positive half cycle of the voltage of the two discharge lamps Fl,
When a voltage is applied between the non-power supply side filament terminals Fll and f22 of F2, the resistor Rb is applied to the resistor RC and the resistor Ra.
The voltage is shared by a voltage dividing and smoothing circuit in which parallel circuits of the capacitor Cb and the capacitor Cb are connected in series, and at the same time, the voltage is also shared by the resistor RA and the resistor RB. Here, the shared voltage of the resistor RB is set to be lower than the shared voltage of the voltage dividing circuit and the lighting voltage of the discharge lamp F2. As the voltage of the power supply E increases, the voltage across the resistor Rb of the voltage dividing smoothing circuit increases, and by the same operation as the conventional preheating control circuit, the thyristor Qh
A gate ignition current is supplied to thyristor Qh2, and thyristor Qh2 becomes conductive for ignition. On the other hand, when the thyristor Qh2 is turned on, the voltage between the non-power supply side filament terminals F2l and f22 of the discharge lamp F2 drops to the saturation voltage between the anode and cathode of the thyristor Qh2, so the cathode potential of the thyristor Qhl drops and the thyristor Qhl gate potential, that is, resistance RB
The shared voltage becomes higher than the cathode potential, and the gate and cathode of the thyristor Qhl are biased in the forward direction, so that the gate firing current is supplied to the thyristor Qhl, and the thyristor Qhl also conducts firing. From power supply E to ballast L, filament terminals F, l, thyristor Qhl
, filament terminal F,2, filament terminal F2,,
A preheating current is supplied to the discharge lamp filament via the thyristor Qh2 and the filament terminal F22. Eventually, as preheating progresses, the high-voltage pulse voltage generation circuit PC generates a high-voltage pulse voltage, and when the discharge lamps Fl and F2 start lighting in the negative half cycle of the power supply voltage, the thyristor is activated by the same operation as in the conventional example. Qh2 loses ignition conduction. When thyristor Qh2 loses ignition conduction, discharge lamp F2
Non-power supply side filament terminal F2l? Since a shared voltage of the power supply voltage by the voltage dividing and smoothing circuit appears between F22, the cathode potential of thyristor Qh becomes higher than the gate potential, and the gate and cathode of thyristor Qhl are reverse biased. Gate ignition current is no longer supplied to Qhl, and thyristor Qhl also ceases to conduct ignition. That is, the thyristors Qhl and Qh2 are no longer conductive, and the preheating current is cut off. Thus, when the preheating current is cut off, the voltage between the filament terminals Fl, , fl2 and F2l9f
22, a positive half cycle voltage of the voltage of the power supply E is applied by a voltage dividing smoothing circuit consisting of resistors RC and Ra, Rb, and Cb, respectively, but due to the phase lag of the discharge lamp lighting voltage with respect to the power supply voltage. , the positive half-cycle power supply voltage applied to the discharge lamp when the preheating current is cut off has a value near the peak value, and the voltage shared by the power supply voltage by the resistor RC and the voltage dividing smoothing circuit also has a value near the peak value. ing. Due to this voltage, the discharge lamps Fl and F2 start discharging in the positive half cycle as well, and enter the lighting state in both the positive and negative cycles. In this way, when both positive and negative cycles enter the lighting state, the preheating control circuit PHC receives the lighting voltage of discharge lamp F2, and the high voltage pulse voltage generation circuit PC and subordinate preheating control circuit DHC receive the sum of the lighting voltages of discharge lamps F and F2. The resistors Ra, Rb and capacitor C of the voltage dividing smoothing circuit of the preheating control circuit PHC are applied respectively.
The value of b is determined by the resistance R of the voltage dividing and smoothing circuit for the lighting voltage of discharge lamp F2.
b The shared voltage is set to be lower than the Zener voltage of the constant voltage element ZD, and the resistors RA,
The value of RB is determined by the resistance R, which is the sum of the lighting voltages of discharge lamps F1 and F2.
When the voltage shared by B is set to be lower than the lighting voltage of the discharge lamp F2, the preheating current remains cut off, and the voltage division ratio of the resistors Rg and Rt of the high-voltage pulse voltage generation circuit PC is set to be lower than the lighting voltage of the discharge lamp Fl and F2. If the voltage shared by the resistor Rg, which is the sum of the lighting voltages, is selected so that the thyristor Qp does not conduct for ignition, no high-voltage pulse voltage is generated and the discharge lamp continues to be lit. In this way, in the present invention, it is not necessary to provide a preheating control circuit PHC for each of the discharge lamps Fl and F2, and only one preheating control circuit PHC is provided, and the others are provided with a dependent preheating control circuit DHC with a simpler circuit configuration. The circuit configuration is streamlined. In the above, the case where two discharge lamps are connected in series has been explained for the sake of simplicity. However, the present invention can be similarly applied to the case where two or more discharge lamps are connected in series. If they are connected in series, they may be configured as shown in FIG.

また予熱制御回路PHCも第1図実施例回路に限らずど
のようなものでも良く、例えば第3図のようにスイツチ
ング素子QB及びダイオードDl,D2を用いて予熱制
御回路PHCを構成しても良い。さらに第4図回路に示
すように、従属予熱制御回路DHCのサイリスタQhl
,Qh2のゲートと他のサイリスタQh3のカードとの
間に接続される抵抗RBl,RB2は、上記ゲートと順
方向電圧に対して低電位側の任意のサイリスタQh3の
カソードとの間に接続すれば良いものであり、また高圧
パルス電圧発生回路も第1図実施例に示したものの他、
どのような回路構成のものでも良い。さらにまた、サイ
リスタQhl〜Qh4としては図示せるような逆阻止3
端子型のサイリスタに限らず、PNP形トランジスタと
NPN形トランジスタとを逆阻止3端子型のサイリスタ
と等価な接続にしたものや、トライアツクにダイオード
を直列接続したようなものを使用してもかまわないもの
である。本発明は上述のように構成したものであるから
、従来例のように複数個直列接続された放電灯の夫夫に
ついて予熱制御回路を設ける必要がなく、複数個の放電
灯のうち1個にのみ予熱制御回路を設け、他は予熱制御
回路より大巾に回路構成が簡略な従属予熱制御回路を設
ければ良いものであつて、予熱回路の構成が簡略化され
、部品点数も削減して装置を安価にすることができる効
果を有するものである。
Further, the preheating control circuit PHC is not limited to the circuit of the embodiment shown in FIG. 1, and may be of any type. For example, the preheating control circuit PHC may be configured using a switching element QB and diodes Dl, D2 as shown in FIG. . Furthermore, as shown in the circuit of FIG. 4, the thyristor Qhl of the dependent preheating control circuit DHC
, Qh2 and the card of another thyristor Qh3 are connected between the gate and the cathode of any thyristor Qh3 on the low potential side with respect to the forward voltage. In addition to the high voltage pulse voltage generating circuit shown in the embodiment of FIG.
Any circuit configuration may be used. Furthermore, the thyristors Qhl to Qh4 may be reverse blocking 3 as shown in the figure.
Not limited to terminal type thyristors, it is also possible to use a type in which a PNP type transistor and an NPN type transistor are connected equivalently to a reverse blocking three-terminal type thyristor, or a type in which a diode is connected in series to a triac. It is something. Since the present invention is configured as described above, there is no need to provide a preheating control circuit for the husband and wife of a plurality of discharge lamps connected in series as in the conventional example. It is sufficient to provide a preheating control circuit for only one preheating control circuit, and a subordinate preheating control circuit whose circuit configuration is much simpler than that of the preheating control circuit for the others, which simplifies the configuration of the preheating circuit and reduces the number of parts. This has the effect of making the device cheaper.

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

第1図は本発明一実施例の回路図、第2図は同上の他の
実施例の回路図、第3図は本発明に用いる予熱制御回路
の他の一例を示す回路図,第4図は本発明の他の実施例
の回路図、第5図は従来例の回路図であり、Lは安定器
、Eは電源、Fl,F2は夫々放電灯、Fll,fl2
,f2l,f22は夫夫フイラメント端子、Qhl,Q
h2,Qh3は夫々サイリスタ、PHCは予熱制御回路
、RA,RB,RCは夫々抵抗、PCは高圧パルス電圧
発生回路である。
FIG. 1 is a circuit diagram of one embodiment of the present invention, FIG. 2 is a circuit diagram of another embodiment of the same, FIG. 3 is a circuit diagram showing another example of the preheating control circuit used in the present invention, and FIG. 4 is a circuit diagram of another embodiment of the present invention, and FIG. 5 is a circuit diagram of a conventional example, where L is a ballast, E is a power supply, Fl and F2 are discharge lamps, respectively.
, f2l, f22 are husband filament terminals, Qhl, Q
h2 and Qh3 are thyristors, PHC is a preheating control circuit, RA, RB, and RC are resistors, and PC is a high-voltage pulse voltage generation circuit.

Claims (1)

【特許請求の範囲】[Claims] 1 直列接続された複数の放電灯を安定器を介して交流
電源に接続し、上記放電灯の各非電源側フィラメント端
子間に同一方向に予熱電流通電用の逆阻止3端子サイリ
スタのようなゲート・カソード間の電圧印加にてアノー
ド・カソード間が導通保持される半導体スイッチ素子を
接続し、順方向電圧に対して最低電位側の上記半導体ス
イッチ素子に、放電灯未点灯時に該半導体スイッチ素子
を点弧導通させるとともに点灯時に点弧導通させないよ
うに制御する予熱制御回路を接続し、他の全ての半導体
スイッチ素子のアノード・カソード間及びアノード・ゲ
ート間に夫々抵抗のようなインピーダンスを接続すると
ともにこの半導体スイッチ素子のゲート端子と他の低電
位側にある任意の半導体スイッチ素子のカソード端子と
の間に抵抗のようなインピーダンスを接続し、さらに始
動用高圧パルス電圧発生回路を上記複数の放電灯の直列
接続回路の両端間に、全放電灯に対してパルス電圧を印
加するように付加し、他の全ての予熱用半導体スイッチ
素子を、予熱制御回路を接続された半導体スイッチ素子
の導通遮断に従属して導通遮断するようにして成ること
を特徴とする放電灯始電灯始動装置。
1 A plurality of discharge lamps connected in series are connected to an AC power source via a ballast, and a gate such as a reverse blocking three-terminal thyristor is installed between each non-power supply side filament terminal of the discharge lamps for preheating current to flow in the same direction.・Connect a semiconductor switch element whose anode and cathode are maintained conductive by applying a voltage between the cathodes, and connect the semiconductor switch element to the semiconductor switch element on the lowest potential side with respect to the forward voltage when the discharge lamp is not lit. Connect a preheating control circuit that controls ignition conduction and prevent ignition conduction during lighting, and connect impedances such as resistors between the anodes and cathodes and between the anodes and gates of all other semiconductor switching elements, respectively. An impedance such as a resistor is connected between the gate terminal of this semiconductor switch element and the cathode terminal of any other semiconductor switch element on the low potential side, and a high-voltage pulse voltage generating circuit for starting is connected to the plurality of discharge lamps. A pulse voltage is applied to all the discharge lamps between both ends of the series-connected circuit of 1. A discharge lamp starter lamp starter device, characterized in that the device is configured to conduct and cut off conduction depending on the source.
JP11111375A 1975-09-13 1975-09-13 discharge lamp starting device Expired JPS5916719B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11111375A JPS5916719B2 (en) 1975-09-13 1975-09-13 discharge lamp starting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11111375A JPS5916719B2 (en) 1975-09-13 1975-09-13 discharge lamp starting device

Publications (2)

Publication Number Publication Date
JPS5235481A JPS5235481A (en) 1977-03-18
JPS5916719B2 true JPS5916719B2 (en) 1984-04-17

Family

ID=14552730

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11111375A Expired JPS5916719B2 (en) 1975-09-13 1975-09-13 discharge lamp starting device

Country Status (1)

Country Link
JP (1) JPS5916719B2 (en)

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