JP2008020583A - Control circuit for led indicator - Google Patents

Control circuit for led indicator Download PDF

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JP2008020583A
JP2008020583A JP2006191161A JP2006191161A JP2008020583A JP 2008020583 A JP2008020583 A JP 2008020583A JP 2006191161 A JP2006191161 A JP 2006191161A JP 2006191161 A JP2006191161 A JP 2006191161A JP 2008020583 A JP2008020583 A JP 2008020583A
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led display
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JP4857969B2 (en
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Akira Aizawa
明 相澤
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Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
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Meidensha Electric Manufacturing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To surely and easily achieve countermeasures to erroneous lighting of a LED indicator caused by an induced voltage at low cost and in a small space. <P>SOLUTION: The control circuit for a LED indicator is constructed in such a manner that the LED indicators 1<SB>1</SB>and 1<SB>2</SB>of a display side are connected to the contacts 3<SB>1</SB>and 3<SB>2</SB>of a control side through signal lines, power supply lines L1 and L2 are interconnected through a power supply cable, the b contacts of contacts are interconnected through a commonly connected common connection line L3, and a batch-testing button switch is provided for each LED indicator. In this case, a resistance circuit 5 is connected between the power supply line of the LED indicator and the common connection line, and erroneous lighting or flashing of the LED caused by an induced current generated by the capacitance of the power supply line or the signal line is prevented. The resistance circuit is a series circuit including a resistor and a capacitor, includes a configuration where only an induced current of a relatively high frequency is absorbed by the capacitor, and a configuration where common connection lines and resistance circuits are provided separately by groups when the LED indicators are divided into a plurality of groups. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、表示側に複数のＬＥＤ表示器を設け、これらに電源ケーブルおよび各信号線で接続される制御側の接点切り替えでＬＥＤ表示器を個別に点灯／消灯制御する制御回路に係り、特にケーブルや信号線の静電容量による誘導電流でＬＥＤが誤って点灯（点滅）するのを防止する回路に関する。   The present invention relates to a control circuit in which a plurality of LED indicators are provided on the display side, and the LED indicators are individually controlled to be turned on / off by switching the contacts on the control side connected to the power cable and each signal line. The present invention relates to a circuit for preventing an LED from being turned on (flashing) by mistake due to an induced current caused by the capacitance of a cable or a signal line.

ＬＥＤ（発光ダイオード）は、各種の電子制御装置やシステムの動作状態を表示する表示器として多用されている。例えば、監視制御システムにおける監視対象の状態をセンサで検出し、この検出状態変化を基に監視盤パネルのＬＥＤ表示器を点灯／消灯駆動する。また、鉄道の信号機の光源に信号電球に代えて多数のＬＥＤを用い、電車位置検出器等のセンシング信号または制御信号によって信号機の表示色を切り替える。   LEDs (light-emitting diodes) are frequently used as indicators for displaying the operating states of various electronic control devices and systems. For example, the state of the monitoring target in the monitoring control system is detected by a sensor, and the LED display of the monitoring panel is driven to turn on / off based on the change in the detected state. In addition, a large number of LEDs are used as the light source of a railway traffic light instead of a signal light bulb, and the display color of the traffic light is switched by a sensing signal or control signal from a train position detector or the like.

このようなＬＥＤ表示器の制御は、制御信号発生源（センサやその信号中継器、増幅器、機器室のＬＥＤ駆動信号発生器など）からＬＥＤ表示器までを長い信号線および電源ケーブルで接続する場合が多い。これら信号線およびケーブルは、線長さに比例して芯線相互間の静電容量が増加し、芯線間の静電結合によって誘導電圧が発生し、この誘導電圧でＬＥＤを誤点灯させることがある。特に、最近のＬＥＤは、省電力化（微小電流駆動）が進み、信号線や電源ケーブルの静電容量に因る誘導電圧で誤点灯することが多くなっている。   Such LED display control is performed when a long signal line and power cable are connected from a control signal generation source (sensor, its signal repeater, amplifier, LED drive signal generator in the equipment room, etc.) to the LED display. There are many. In these signal lines and cables, the capacitance between the core wires increases in proportion to the wire length, and an induced voltage is generated by the electrostatic coupling between the core wires, and the LED may be erroneously turned on by this induced voltage. . Particularly in recent LEDs, power saving (micro current drive) has progressed, and there are many cases where erroneous lighting is caused by an induced voltage caused by the electrostatic capacity of a signal line or a power cable.

静電誘導によるＬＥＤの誤点灯防止方法には、以下のような方法がある。   There are the following methods for preventing erroneous lighting of LEDs by electrostatic induction.

（１）ＬＥＤの電源回路などにトランスを介在させ、信号線や電源ケーブル回線側からみたＬＥＤ表示側のインピーダンスを下げて誘導電圧を低く抑える。   (1) A transformer is interposed in the LED power circuit and the like, and the impedance on the LED display side viewed from the signal line and the power cable line side is lowered to keep the induced voltage low.

（２）ＬＥＤの駆動電源を直流とし、信号線や電源ケーブルからの誘導電圧侵入をパスコンで吸収する。   (2) The driving power of the LED is a direct current, and the induction voltage intrusion from the signal line or power cable is absorbed by the bypass capacitor.

（３）ＬＥＤを静電容量対策タイプのものに交換する。   (3) Replace the LED with a capacitance countermeasure type.

（４）ＬＥＤの点灯しようとする時間だけ電源を活性にする（例えば、特許文献１参照）。   (4) The power source is activated only for the time when the LED is to be turned on (see, for example, Patent Document 1).

（５）ＬＥＤに並列に低インピーダンスの抵抗を設け、信号線の誘導電圧を抵抗で吸収する。この回路例を図３に示し、表示側の各ＬＥＤ表示器１１、１２、…に並列にそれぞれ抵抗２1、２2、…を設け、制御側の交流電源ＡＣや信号線に誘導電圧が発生した場合にも抵抗２1、２2、…により誘導電圧を吸収し、それに並列のＬＥＤ表示器１1、１2、…が誤点灯しないようにする。なお、３1、３2、…はＬＥＤ表示器の点灯／消灯を制御する接点、４はＬＥＤ表示器の点灯を一括テストするためのボタンスイッチである。
特開２００３−１７０８２９ (5) A low impedance resistor is provided in parallel with the LED, and the induced voltage of the signal line is absorbed by the resistor. This circuit example is shown in FIG. 3, and resistors 2 1 , 2 2 ,... Are provided in parallel with the LED indicators 11, 12,. In this case, the induced voltage is absorbed by the resistors 2 1 , 2 2 ,... So that the LED displays 1 1 , 1 2 ,. In addition, 3 1 , 3 2 ,... Are contacts for controlling turning on / off of the LED display, and 4 is a button switch for collectively testing the lighting of the LED display.
JP 2003-170829 A

前記の（１）の方法は、ＬＥＤ表示器毎にトランスを必要として、高価になる。（２）の方法は、既設のものに直流電源がない場合には電源増設を必要とする。（３）の方法は、静電容量対策タイプのＬＥＤは高価になる。（４）の方法は、ＬＥＤ表示器毎に電源制御装置が必要となり、高価になるし、回路が複雑化してＬＥＤ表示器としての信頼性を低下させる。（５）の方法は、ＬＥＤ表示器毎に並列抵抗を設ける必要があり、コスト・スペースの面で問題がある。   The method (1) requires a transformer for each LED display and is expensive. The method (2) requires an additional power supply if there is no DC power supply in the existing system. In the method (3), the capacitance countermeasure type LED is expensive. The method (4) requires a power supply control device for each LED display, which is expensive and complicates the circuit and reduces the reliability of the LED display. In the method (5), it is necessary to provide a parallel resistance for each LED display, which is problematic in terms of cost and space.

本発明の目的は、誘導電圧によるＬＥＤ表示器の誤点灯対策を低価格／小スペースで確実、容易に実現できるＬＥＤ表示器の制御回路を提供することにある。   It is an object of the present invention to provide a control circuit for an LED display that can reliably and easily realize a countermeasure for erroneous lighting of the LED display due to an induced voltage at low cost / small space.

本発明は、従来のＬＥＤ表示器の制御回路では、表示側のボタンスイッチによりＬＥＤ表示器の点灯／消灯の一括テストを可能とするため、各ＬＥＤ表示器の点灯／消灯制御用接点のうちｂ接点を共通接続して表示側に接続されていることを利用し、表示側の接点共通接続線と各ＬＥＤ表示器の電源ライン間を誘導電圧抑制用抵抗器で終端接続することで前記の課題を解決するもので、以下の構成を特徴とする。   In the control circuit of the conventional LED display, the present invention enables a batch test of turning on / off the LED display by using a button switch on the display side. Utilizing the fact that the contacts are connected in common and connected to the display side, the above-mentioned problem is achieved by terminating connection between the display-side contact common connection line and the power line of each LED display with an inductive voltage suppression resistor. Is characterized by the following configuration.

（１）表示側は複数のＬＥＤ表示器を設け、制御側は各ＬＥＤ表示器別に点灯／消灯の駆動信号を発生する接点回路および各ＬＥＤ表示器を交流駆動する電源を有し、表示側と制御側は各接点回路とＬＥＤ表示器を個別に接続する信号線および電源ケーブルで接続し、表示側と制御側は各接点回路のｂ接点を共通に接続した共通接続線で接続し、表示側で前記接続線と電源ライン間に各ＬＥＤ表示器の一括テスト用ボタンスイッチを設けたＬＥＤ表示器の制御回路において、
表示側で、前記ＬＥＤ表示器の電源ラインと前記共通接続線との間に抵抗回路を接続し、この抵抗回路は、前記電源ケーブルや信号線の静電容量による誘導電流でＬＥＤ表示器が誤って点灯または点滅するのを防止できる抵抗値にしたことを特徴とする。 (1) The display side is provided with a plurality of LED indicators, and the control side has a contact circuit for generating a driving signal for turning on / off each LED indicator and a power source for AC driving each LED indicator, The control side is connected by signal lines and power cables that individually connect each contact circuit and LED display, and the display side and control side are connected by a common connection line that connects b contacts of each contact circuit in common. In the control circuit of the LED display provided with a button switch for batch test of each LED display between the connection line and the power line,
On the display side, a resistance circuit is connected between the power line of the LED display and the common connection line, and this resistance circuit causes an error in the LED display due to an induced current due to the capacitance of the power cable or signal line. The resistance value is such that it can be prevented from turning on or blinking.

（２）前記抵抗回路は、抵抗器とコンデンサの直列回路とし、コンデンサにより比較的高い周波数の誘導電流のみを吸収する構成としたことを特徴とする。   (2) The resistor circuit is a series circuit of a resistor and a capacitor, and the capacitor absorbs only a relatively high frequency induced current.

（３）前記各ＬＥＤ表示器が複数グループに分けられる場合、前記共通接続線もグループ別に設け、前記抵抗回路もグループ別に設けた構成としたことを特徴とする。   (3) When each LED indicator is divided into a plurality of groups, the common connection line is also provided for each group, and the resistance circuit is also provided for each group.

以上のとおり、本発明によれば、表示側の接点共通接続線と各ＬＥＤ表示器の電源ライン間を誘導電圧抑制用抵抗器で終端接続するようにしたため、誘導電圧によるＬＥＤ表示器の誤点灯対策を低価格／小スペースで確実、容易に実現できる。具体的には以下の効果がある。   As described above, according to the present invention, the terminal-side common connection line on the display side and the power supply line of each LED display are terminated and connected with the resistor for suppressing the induced voltage. Measures can be implemented reliably and easily at a low price / small space. Specifically, the following effects are obtained.

（１）誘導電圧抑制用のＬＥＤ表示器毎のトランスが不要になる。   (1) A transformer for each LED display for suppressing induced voltage is not required.

（２）ＬＥＤ表示器の駆動電源が交流電源のものにそのまま適用できる。   (2) The driving power source of the LED display can be applied as it is to an AC power source.

（３）静電容量対策タイプの高価なＬＥＤ表示器に交換する必要がない。   (3) There is no need to replace with an expensive LED display of a capacitance countermeasure type.

（４）ＬＥＤ表示器毎の電源制御装置が不要となる。   (4) A power supply control device for each LED display is not required.

（５）ＬＥＤ表示器毎に並列抵抗を設ける必要がない。   (5) There is no need to provide a parallel resistor for each LED display.

図１は、本発明の実施形態を示すＬＥＤ表示器の制御回路図である。同図が図３と異なる部分は、ＬＥＤ表示器１1、１2、…に並列に設けている抵抗２1、２2、…を省き、これに代えてテスト用のボタンスイッチ４と接点３1、３2、…のｂ接点とを共通接続するｂ接点共通接続線と、ＬＥＤ表示器の電源ラインとの間に回路に共通の１つの抵抗回路５を表示器側で設けた点にある。 FIG. 1 is a control circuit diagram of an LED display showing an embodiment of the present invention. 3 differs from FIG. 3 in that the resistors 2 1 , 2 2 ,... Provided in parallel with the LED indicators 1 1 , 1 2 ,. 1 , 3 2 ,... Is commonly provided on the display side with one resistor circuit 5 between the b contact common connection line for commonly connecting the b contacts and the power line of the LED display. .

この回路構成において、制御側で、ＬＥＤ表示器の駆動電源になる交流電源ラインＬ１，Ｌ２間に誘導電圧が発生し、この誘導電圧が表示側のＬＥＤ表示器の電源ラインＬ２に現れようとするとき、接点３1、３2、…の少なくとも１つがｂ接点側にあるため、表示側の接点共通接続線Ｌ３と電源ラインＬ２間が抵抗回路５の抵抗値Ｒで終端されており、表示側での誘導電圧が抵抗回路５で吸収することができる。 In this circuit configuration, on the control side, an induced voltage is generated between the AC power supply lines L1 and L2 serving as the driving power supply for the LED display, and this induced voltage tends to appear on the power supply line L2 of the LED display on the display side. When at least one of the contacts 3 1 , 3 2 ,... Is on the b contact side, the display side contact common connection line L 3 and the power supply line L 2 are terminated with the resistance value R of the resistance circuit 5. Can be absorbed by the resistance circuit 5.

また、表示側の信号線に誘導電圧が現れようとするとき、接点３1、３2、…の少なくとも１つがｂ接点側にあり、接点共通接続線Ｌ３との間が抵抗回路５の抵抗値Ｒで終端されており、表示側での誘導電圧が抵抗回路５で吸収することができる。 When an induced voltage appears on the signal line on the display side, at least one of the contacts 3 1 , 3 2 ,... Is on the b contact side, and the resistance value of the resistance circuit 5 is between the contact common connection line L3. It is terminated with R, and the induced voltage on the display side can be absorbed by the resistance circuit 5.

また、交流電源ラインＬ１，Ｌ２間の誘導電圧がボタンスイッチ４を通して表示側に現れたときも抵抗回路５によって吸収することができる。   Further, when the induced voltage between the AC power supply lines L1 and L2 appears on the display side through the button switch 4, it can be absorbed by the resistance circuit 5.

なお、抵抗回路５の抵抗値Ｒは、電源ケーブルや信号線の単位長当たりの静電容量、長さ等によって適宜調整することができるが、例えば、図２に信号線での等価回路で示すように、ＬＥＤ表示器とその動作接点との間を多芯信号線で接続した場合、下記の表に示す信号線長さＫに応じた抵抗値を推奨値として求めることができる。   Note that the resistance value R of the resistance circuit 5 can be adjusted as appropriate according to the capacitance per unit length of the power cable or signal line, the length, etc., for example, FIG. 2 shows an equivalent circuit of the signal line. As described above, when the LED display and its operation contact are connected by a multi-core signal line, a resistance value corresponding to the signal line length K shown in the following table can be obtained as a recommended value.

Figure 2008020583
Figure 2008020583

Figure 2008020583
Figure 2008020583

また、抵抗回路５は、抵抗のみで構成するに限らず、抵抗とコンデンサの直列回路とすることができる。この場合、コンデンサにより比較的高い周波数の誘導電流のみを吸収し、抵抗による電力損失を軽減できる。   The resistor circuit 5 is not limited to a resistor only, but can be a series circuit of a resistor and a capacitor. In this case, only a relatively high frequency induced current is absorbed by the capacitor, and power loss due to the resistance can be reduced.

また、実施形態では、共通接続線は、１本とする場合を示すが、電車の信号機用ＬＥＤ表示器など、各ＬＥＤ表示器が色別に複数グループに分けられる場合などでは、共通接続線もグループ別に設け、抵抗回路もグループ別に設けた構成として同等の作用効果を得ることができる。   In the embodiment, the number of common connection lines is one. However, in the case where each LED indicator is divided into a plurality of groups according to colors, such as an LED display for a traffic signal on a train, the common connection line is also a group. The same effect can be obtained as a configuration in which a resistor circuit is provided separately for each group.

本発明の実施形態を示すＬＥＤ表示器の制御回路図。The control circuit diagram of the LED display which shows embodiment of this invention. 実施形態における抵抗回路の抵抗値算出のための等価回路図。The equivalent circuit diagram for resistance value calculation of the resistance circuit in embodiment. 従来のＬＥＤ表示器の制御回路図。The control circuit diagram of the conventional LED display.

符号の説明Explanation of symbols

１1、１2 ＬＥＤ表示器
３1、３2 ＬＥＤ表示器駆動用接点
４ ランプテスト用ボタンスイッチ
５ 誘導電圧吸収用の抵抗回路
1 1 , 1 2 LED display 3 1 , 3 2 LED display drive contact 4 Lamp test button switch 5 Inductive voltage absorption resistor circuit

Claims (3)

表示側は複数のＬＥＤ表示器を設け、制御側は各ＬＥＤ表示器別に点灯／消灯の駆動信号を発生する接点回路および各ＬＥＤ表示器を交流駆動する電源を有し、表示側と制御側は各接点回路とＬＥＤ表示器を個別に接続する信号線および電源ケーブルで接続し、表示側と制御側は各接点回路のｂ接点を共通に接続した共通接続線で接続し、表示側で前記接続線と電源ライン間に各ＬＥＤ表示器の一括テスト用ボタンスイッチを設けたＬＥＤ表示器の制御回路において、
表示側で、前記ＬＥＤ表示器の電源ラインと前記共通接続線との間に抵抗回路を接続し、この抵抗回路は、前記電源ケーブルや信号線の静電容量による誘導電流でＬＥＤ表示器が誤って点灯または点滅するのを防止できる抵抗値にしたことを特徴とするＬＥＤ表示器の制御回路。 The display side is provided with a plurality of LED indicators, and the control side has a contact circuit for generating a driving signal for turning on / off each LED indicator and a power source for AC driving each LED indicator. Connect each contact circuit and LED display with signal line and power cable individually, and connect display side and control side with common connection line that connect b contact of each contact circuit in common, and connect on the display side In the control circuit of the LED display provided with a button switch for batch testing of each LED display between the power line and the power line,
On the display side, a resistance circuit is connected between the power line of the LED display and the common connection line, and this resistance circuit causes an error in the LED display due to an induced current due to the capacitance of the power cable or signal line. A control circuit for an LED display, characterized in that the resistance value is set to prevent lighting or blinking. 前記抵抗回路は、抵抗器とコンデンサの直列回路とし、コンデンサにより比較的高い周波数の誘導電流のみを吸収する構成としたことを特徴とする請求項１に記載のＬＥＤ表示器の制御回路。   2. The control circuit for an LED display according to claim 1, wherein the resistor circuit is a series circuit of a resistor and a capacitor, and the capacitor absorbs only a relatively high frequency induced current. 前記各ＬＥＤ表示器が複数グループに分けられる場合、前記共通接続線もグループ別に設け、前記抵抗回路もグループ別に設けた構成としたことを特徴とする請求項１または２に記載のＬＥＤ表示器の制御回路。
3. The LED display according to claim 1, wherein when each LED display is divided into a plurality of groups, the common connection line is also provided for each group, and the resistance circuit is also provided for each group. Control circuit.
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JP2011223083A (en) * 2010-04-05 2011-11-04 Nippon Avionics Co Ltd Projector enhanced in static electricity noise resistance
JP2015505133A (en) * 2011-12-12 2015-02-16 コーニンクレッカ フィリップス エヌ ヴェ Circuit arrangement for selectively powering distributed loads

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