JP4646218B2 - Discharge lamp lighting device - Google Patents

Discharge lamp lighting device Download PDF

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JP4646218B2
JP4646218B2 JP2005163610A JP2005163610A JP4646218B2 JP 4646218 B2 JP4646218 B2 JP 4646218B2 JP 2005163610 A JP2005163610 A JP 2005163610A JP 2005163610 A JP2005163610 A JP 2005163610A JP 4646218 B2 JP4646218 B2 JP 4646218B2
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discharge lamp
lamp lighting
discharge
control
lighting device
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JP2006339053A (en
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文人 塚本
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Nichicon Capacitor Ltd
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本発明は、並列に接続された二灯以上の放電灯を高周波で点灯させ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 for lighting two or more discharge lamps connected in parallel at a high frequency.

放電灯を備えた放電灯点灯装置として、例えば特許文献1および特許文献2のようなものがある。そして、二灯の放電灯を並列に接続した放電灯点灯装置は、次のように構成されている。
図2は、従来の放電灯点灯装置の要部を示す回路図であり、これに基づいて従来の放電灯点灯装置を説明する。
As a discharge lamp lighting device provided with a discharge lamp, there exist a thing like patent document 1 and patent document 2, for example. And the discharge lamp lighting device which connected the two discharge lamps in parallel is comprised as follows.
FIG. 2 is a circuit diagram showing a main part of a conventional discharge lamp lighting device, and the conventional discharge lamp lighting device will be described based on this circuit diagram.

従来の放電灯点灯装置は、巻線トランス38のH側から並列に接続され、電流を制限する2つのバラストコンデンサ33,34を備えており、各バラストコンデンサ33,34に二灯の放電灯30,31が直列に接続されている。放電灯電源39に、巻線トランス38が接続されている。
電流設定抵抗36は、一方が各放電灯30,31に直列に接続され、他方が巻線トランス38のL側(GND)に接続されている。電流設定抵抗36と各放電灯30,31との間に整流ダイオード35のアノード側が接続されている。
そして、整流ダイオード35のカソード側が、電流を制御するコントロールIC32と、電流制御信号を平滑する平滑コンデンサ37の一方とに接続されている。平滑コンデンサ37の他方側はGNDに接続されている。
The conventional discharge lamp lighting device includes two ballast capacitors 33 and 34 that are connected in parallel from the H side of the winding transformer 38 and limit the current, and each of the ballast capacitors 33 and 34 includes two discharge lamps 30. , 31 are connected in series. A winding transformer 38 is connected to the discharge lamp power supply 39.
One of the current setting resistors 36 is connected in series to each of the discharge lamps 30 and 31, and the other is connected to the L side (GND) of the winding transformer 38. The anode side of the rectifier diode 35 is connected between the current setting resistor 36 and each of the discharge lamps 30 and 31.
The cathode side of the rectifier diode 35 is connected to the control IC 32 that controls the current and one of the smoothing capacitors 37 that smoothes the current control signal. The other side of the smoothing capacitor 37 is connected to GND.

そして、二灯の放電灯30,31が接続されて点灯している間は、各バラストコンデンサ33,34によって均等に管電流が流れるが、放電灯の一方、例えば放電灯30が切れる(オープンになる)と、他方の放電灯31に約2倍の管電流が流れるので、この放電灯31の寿命が短くなり、発熱が大きくなるという問題がある。
また、出力端子に高圧が発生したままになるので、安全性にも問題がある。
特開2000−30881号公報、図1 特開昭58−38494号公報
While the two discharge lamps 30 and 31 are connected and lit, the tube current flows uniformly by the ballast capacitors 33 and 34, but one of the discharge lamps, for example, the discharge lamp 30 is cut off (opened). ), About twice as much tube current flows through the other discharge lamp 31, so that there is a problem that the life of the discharge lamp 31 is shortened and heat generation is increased.
In addition, since high voltage remains generated at the output terminal, there is a problem in safety.
Japanese Patent Laid-Open No. 2000-30881, FIG. JP 58-38494 A

本発明が解決しようとする課題は、前記した問題点に鑑み、二灯以上の放電灯のいずれか一つが切れても、他の放電灯の寿命の低下を防止すると共に、安全性を向上させる放電灯点灯装置を提供することにある。   In view of the above problems, the problem to be solved by the present invention is to prevent a decrease in the life of other discharge lamps and improve safety even when one of two or more discharge lamps is cut off. The object is to provide a discharge lamp lighting device.

前記の課題を解決するため、本発明に係る放電灯点灯装置は、並列に接続された二灯以上の放電灯と、各放電灯を高周波で点灯させるための放電灯点灯電源と、各放電灯のいずれか一つが切れたときに、放電灯点灯電源を停止させる保護回路とを備え
保護回路が、各放電灯に接続された管電流設定抵抗と、放電灯点灯電源を制御するコントロールICとを備え、各放電灯と過電流検出抵抗とを接続し、各放電灯と各過電流検出抵抗との間に第一整流ダイオードのアノード側を接続し、各第一整流ダイオードのカソード側と定電圧ダイオードのカソード側とを接続し、各過電流検出抵抗の接続点と管電流設定抵抗とを接続し、接続点と第二整流ダイオードのアノード側とを接続し、第二整流ダイオードのカソード側に、平滑コンデンサとコントロールICとを接続してなり、管電流設定抵抗の両端の電圧がコントロールIC内部の基準電圧に対して低くなったとき、コントロールICが放電灯点灯電源を停止させる。
In order to solve the above problems, a discharge lamp lighting device according to the present invention includes two or more discharge lamps connected in parallel, a discharge lamp lighting power source for lighting each discharge lamp at a high frequency, and each discharge lamp. A protection circuit that stops the discharge lamp lighting power supply when any one of the
The protection circuit includes a tube current setting resistor connected to each discharge lamp and a control IC for controlling the discharge lamp lighting power source, and connects each discharge lamp to an overcurrent detection resistor. The anode side of the first rectifier diode is connected between the detection resistor, the cathode side of each first rectifier diode and the cathode side of the constant voltage diode are connected, the connection point of each overcurrent detection resistor and the tube current setting resistor And connecting the connection point and the anode side of the second rectifier diode, and connecting the smoothing capacitor and the control IC to the cathode side of the second rectifier diode, the voltage across the tube current setting resistor is When the voltage becomes lower than the reference voltage inside the control IC, the control IC stops the discharge lamp lighting power source.

本発明に係る放電灯点灯装置によれば、保護回路によって、二灯以上の放電灯のいずれか一つが切れたとき、放電灯点灯電源の出力を停止するよう構成されている。
従って、他の放電灯に流れる電流が抑えられ、放電灯の寿命低下が防止でき、発熱等を生じることもなく安全である。
The discharge lamp lighting device according to the present invention is configured to stop the output of the discharge lamp lighting power source when any one of two or more discharge lamps is cut off by the protection circuit.
Accordingly, the current flowing through the other discharge lamps can be suppressed, the life of the discharge lamp can be prevented from being shortened, and it is safe without generating heat.

以下、添付図面に基づいて、本発明に係る放電灯点灯装置について詳細に説明する。   Hereinafter, a discharge lamp lighting device according to the present invention will be described in detail with reference to the accompanying drawings.

図1は、本発明に係る放電灯点灯装置を示す回路図である。
図1の如く、放電灯点灯装置は、二灯の放電灯1,2を高周波で点灯させる放電灯点灯電源15を備え、この放電灯点灯電源15に、巻線トランス12が接続されている。
FIG. 1 is a circuit diagram showing a discharge lamp lighting device according to the present invention.
As shown in FIG. 1, the discharge lamp lighting device includes a discharge lamp lighting power source 15 for lighting two discharge lamps 1 and 2 at a high frequency, and a winding transformer 12 is connected to the discharge lamp lighting power source 15.

巻線トランス12のH側に、二つのバラストコンデンサ13,14を並列に接続し、各バラストコンデンサ13,14に、放電灯1,2をそれぞれ直列に接続する。
そして、放電灯1,2に、過電流検出抵抗6,7をそれぞれ直列に接続する。
さらに、二つの過電流検出抵抗6,7を接続し、該接続点16に管電流設定抵抗5を接続する。この管電流設定抵抗5は、正常時における各放電灯1,2へ流れる電流を調整するものである。
Two ballast capacitors 13 and 14 are connected in parallel to the H side of the winding transformer 12, and the discharge lamps 1 and 2 are connected in series to the ballast capacitors 13 and 14, respectively.
Then, overcurrent detection resistors 6 and 7 are connected in series to the discharge lamps 1 and 2, respectively.
Further, two overcurrent detection resistors 6 and 7 are connected, and the tube current setting resistor 5 is connected to the connection point 16. This tube current setting resistor 5 adjusts the current flowing to each of the discharge lamps 1 and 2 at the normal time.

管電流設定抵抗5は、一方側が出力トランス12のL側(GND)に接続されている。管電流設定抵抗5と過電流検出抵抗6,7との接続点16に、第二整流ダイオード10のアノード側を接続し、該第二整流ダイオード10のカソード側に、電流制御信号を平滑する平滑コンデンサ11の一方側と、コントロールIC3とを並列に接続する。   One side of the tube current setting resistor 5 is connected to the L side (GND) of the output transformer 12. Smoothing is performed by connecting the anode side of the second rectifier diode 10 to the connection point 16 between the tube current setting resistor 5 and the overcurrent detection resistors 6 and 7, and smoothing the current control signal on the cathode side of the second rectifier diode 10. One side of the capacitor 11 and the control IC 3 are connected in parallel.

コントロールIC3は、放電灯点灯電源15に接続されており、放電灯点灯電源15を制御するものである。平滑コンデンサ11の他方側は、GND(接地)に接続されている。さらに、放電灯1,2と過電流検出抵抗6,7との間に、各々第一整流ダイオード8,9のアノード側が接続されている。   The control IC 3 is connected to the discharge lamp lighting power source 15 and controls the discharge lamp lighting power source 15. The other side of the smoothing capacitor 11 is connected to GND (ground). Further, the anode sides of the first rectifier diodes 8 and 9 are connected between the discharge lamps 1 and 2 and the overcurrent detection resistors 6 and 7, respectively.

各第一整流ダイオード8,9のカソード側と、定電圧ダイオード4のカソード側とを接続し、定電圧ダイオード4のアノード側をGNDに接続する。   The cathode side of each of the first rectifier diodes 8 and 9 and the cathode side of the constant voltage diode 4 are connected, and the anode side of the constant voltage diode 4 is connected to GND.

本発明に係る放電灯点灯装置は、上記のように構成されており、正常時においては、二灯の放電灯1,2が点灯中、バラストコンデンサ13,14によって均等に管電流が流れる。
そして、何らかの要因で、二灯の放電灯1,2のいずれか一方、例えば放電灯2が切れた場合は、放電灯1に正常時に対して約2倍の管電流が流れる。
The discharge lamp lighting device according to the present invention is configured as described above. Under normal conditions, the tube current flows evenly through the ballast capacitors 13 and 14 while the two discharge lamps 1 and 2 are lit.
For some reason, when one of the two discharge lamps 1 and 2, for example, the discharge lamp 2 is cut off, about twice as much tube current flows through the discharge lamp 1 as normal.

それに伴って、過電流検出抵抗7の両端には、正常時の約2倍の電圧が印加されることになる。
しかし、定電圧ダイオード4によって、強制的に、管電流設定抵抗5および過電流検出抵抗7に印加される電圧が、所定電圧にまで下げられ、所定電圧以上にならないようにクランプする。
Along with this, a voltage about twice that in the normal state is applied to both ends of the overcurrent detection resistor 7.
However, the voltage applied to the tube current setting resistor 5 and the overcurrent detection resistor 7 is forcibly lowered by the constant voltage diode 4 to a predetermined voltage and clamped so as not to exceed the predetermined voltage.

これにより、コントロールIC3に設けられたタイマ・ラッチ機能が作動して、ラッチ動作をし、放電灯点灯電源15の駆動を停止するよう構成されている。このタイマ・ラッチ機能は、コントロールIC3に設定された基準電圧(例えば1[V])と、管電流設定抵抗5の両端の電圧(過電流検出抵抗7と管電流設定抵抗5の電圧の和を、過電流検出抵抗7と管電流設定抵抗5の抵抗比で分圧した電圧)とを比較して、両端の電圧が、所定期間、基準電圧(1[V])より低くなるとコントロールIC3の出力を停止する。   As a result, the timer / latch function provided in the control IC 3 operates to perform a latch operation and stop the driving of the discharge lamp lighting power source 15. This timer / latch function calculates the sum of the reference voltage (for example, 1 [V]) set in the control IC 3 and the voltage across the tube current setting resistor 5 (the voltage of the overcurrent detection resistor 7 and the tube current setting resistor 5). , The voltage divided by the resistance ratio of the overcurrent detection resistor 7 and the tube current setting resistor 5), and when the voltage at both ends becomes lower than the reference voltage (1 [V]) for a predetermined period, the output of the control IC 3 To stop.

従って、前記の管電流設定抵抗5の両端の電圧を、定電圧ダイオード4によって、コントロールIC3内部の基準電圧より強制的に下げることにより、コントロールIC3の出力を停止する。
このように構成された保護回路によって、放電灯点灯電源15から放電灯1へ流れる電流が停止され、放電灯1の寿命の低下や、発熱等を生じる危険性を防止することができる。
Therefore, the output of the control IC 3 is stopped by forcibly lowering the voltage across the tube current setting resistor 5 by the constant voltage diode 4 from the reference voltage inside the control IC 3.
With the protection circuit configured as described above, the current flowing from the discharge lamp lighting power supply 15 to the discharge lamp 1 is stopped, and the life of the discharge lamp 1 can be prevented from being shortened and the risk of generating heat can be prevented.

従来の放電灯点灯装置は、二灯の放電灯1,2のいずれか一方が切れた場合でも、コントロールICにより停止することなく、切れていない放電灯に約2倍の電流が流れるので、放電灯の寿命の低下や、安全性に問題があった。
しかし、本発明に係る放電灯点灯装置は、二灯の放電灯のうち、一灯の放電灯が点灯中に切れた場合や、初めから切れている場合には、保護回路のコントロールICが放電灯点灯電源を停止させて、他方の放電灯に流れる電流が抑えられるので、これらの問題はない。
In the conventional discharge lamp lighting device, even when one of the two discharge lamps 1 and 2 is cut off, the control IC does not stop the current, and about twice as much current flows through the discharge lamp that is not cut off. There was a problem in the life of the lamp and the safety.
However, the discharge lamp lighting device according to the present invention releases the control IC of the protection circuit when one of the two discharge lamps is cut off during lighting or from the beginning. Since the electric power for lighting the lamp is stopped and the current flowing through the other discharge lamp is suppressed, these problems do not occur.

なお、上記実施例では、二灯の放電灯の場合について説明したが、三灯以上の放電灯を備えた放電灯点灯装置にも、本発明を適用することができる。   In the above embodiment, the case of two discharge lamps has been described. However, the present invention can be applied to a discharge lamp lighting device including three or more discharge lamps.

本発明に係る放電灯点灯装置を示す回路図である。It is a circuit diagram which shows the discharge lamp lighting device which concerns on this invention. 従来の放電灯点灯装置の要部を示す回路図である。It is a circuit diagram which shows the principal part of the conventional discharge lamp lighting device.

符号の説明Explanation of symbols

1,2 放電灯
3 コントロールIC
4 定電圧ダイオード
5 管電流設定抵抗
6,7 過電流検出抵抗
8,9 第一整流ダイオード
10 第二整流ダイオード
11,13,14 平滑コンデンサ
12 巻線トランス
15 放電灯点灯電源
16 各過電流検出抵抗の接続点
30,31 放電灯
32 コントロールIC
33,34,37 平滑コンデンサ
35 整流ダイオード
36 管電流設定抵抗
38 巻線トランス
39 放電灯点灯電源
1, 2 Discharge lamp 3 Control IC
4 Constant voltage diode 5 Tube current setting resistor 6, 7 Overcurrent detection resistor 8, 9 First rectifier diode 10 Second rectifier diode 11, 13, 14 Smoothing capacitor 12 Winding transformer 15 Discharge lamp lighting power supply 16 Each overcurrent detection resistor Connection points 30, 31 Discharge lamp 32 Control IC
33, 34, 37 Smoothing capacitor 35 Rectifier diode 36 Tube current setting resistor 38 Winding transformer 39 Discharge lamp lighting power source

Claims (1)

並列に接続された二灯以上の放電灯と、前記各放電灯を高周波で点灯させるための放電灯点灯電源と、前記各放電灯のいずれか一つが切れたときに、前記放電灯点灯電源を停止させる保護回路とを備え
前記保護回路が、前記各放電灯に接続された管電流設定抵抗と、前記放電灯点灯電源を制御するコントロールICとを備え、前記各放電灯と過電流検出抵抗とを接続し、前記各放電灯と前記各過電流検出抵抗との間に第一整流ダイオードのアノード側を接続し、各第一整流ダイオードのカソード側と定電圧ダイオードのカソード側とを接続し、前記各過電流検出抵抗の接続点と前記管電流設定抵抗とを接続し、該接続点と第二整流ダイオードのアノード側とを接続し、第二整流ダイオードのカソード側に、平滑コンデンサと前記コントロールICとを接続してなり、前記管電流設定抵抗の両端の電圧が前記コントロールIC内部の基準電圧に対して低くなったとき、前記コントロールICが前記放電灯点灯電源を停止させることを特徴とする放電灯点灯装置。
Two or more discharge lamps connected in parallel, a discharge lamp lighting power source for lighting each discharge lamp at a high frequency, and when any one of the discharge lamps is cut off, the discharge lamp lighting power source With a protection circuit to stop ,
The protection circuit includes a tube current setting resistor connected to each of the discharge lamps and a control IC for controlling the discharge lamp lighting power source, and connects each of the discharge lamps to an overcurrent detection resistor. The anode side of the first rectifier diode is connected between the lamp and each overcurrent detection resistor, the cathode side of each first rectifier diode and the cathode side of the constant voltage diode are connected, and each of the overcurrent detection resistors Connect the connection point and the tube current setting resistor, connect the connection point and the anode side of the second rectifier diode, and connect the smoothing capacitor and the control IC to the cathode side of the second rectifier diode. when the voltage across the tube current setting resistor is lowered to the reference voltage of the internal the control IC, the control IC is characterized by stopping the discharge lamp lighting power Lamp lighting device.
JP2005163610A 2005-06-03 2005-06-03 Discharge lamp lighting device Expired - Fee Related JP4646218B2 (en)

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JP4646218B2 true JP4646218B2 (en) 2011-03-09

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09115679A (en) * 1995-10-21 1997-05-02 Meiji Natl Ind Co Ltd High frequency lighting method for discharge lamp, and high frequency lighting device
JPH10340788A (en) * 1997-06-06 1998-12-22 Hitachi Ltd Discharge lamp lighting device
JP2002110388A (en) * 2000-09-29 2002-04-12 Nec Mitsubishi Denki Visual Systems Kk Lighting device of discharge tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09115679A (en) * 1995-10-21 1997-05-02 Meiji Natl Ind Co Ltd High frequency lighting method for discharge lamp, and high frequency lighting device
JPH10340788A (en) * 1997-06-06 1998-12-22 Hitachi Ltd Discharge lamp lighting device
JP2002110388A (en) * 2000-09-29 2002-04-12 Nec Mitsubishi Denki Visual Systems Kk Lighting device of discharge tube

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