JP4102615B2 - Signal lamp disconnection detection circuit - Google Patents

Signal lamp disconnection detection circuit Download PDF

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Publication number
JP4102615B2
JP4102615B2 JP2002229809A JP2002229809A JP4102615B2 JP 4102615 B2 JP4102615 B2 JP 4102615B2 JP 2002229809 A JP2002229809 A JP 2002229809A JP 2002229809 A JP2002229809 A JP 2002229809A JP 4102615 B2 JP4102615 B2 JP 4102615B2
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disconnection
detection circuit
detection
signal lamp
diagnostic current
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JP2004071378A (en
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与文 栗栖
伸幸 鎌田
徹 前田
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Hitachi Ltd
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Hitachi Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、鉄道信号機の信号灯断芯検知回路に係り、非動作中（消灯中）の信号灯の断芯および出力配線の断線を検知する技術に関する。
【０００２】
【従来の技術】
従来、非動作時（信号灯消灯時）の信号灯の断芯を検知する断芯検知回路としては、非動作時の信号灯に微少電流を流し、この微少電流で励磁する検知リレーの接点信号により信号灯の断芯を検知する技術があり、このような信号灯の断芯検知技術は、実公平７−３７１８７号に開示されている。
【０００３】
【発明が解決しようとする課題】
従来の技術では、断芯検知中に検知リレーを励磁する電源が喪失した場合や検知回路がオープン故障した場合でも、検知結果は実際に断芯した場合と同じになり、検知装置の故障と断芯との判別がつかない。このため、信号灯が正常でありながら誤って断芯と検知される場合がある。
【０００４】
本発明の課題は、非動作（信号灯消灯時）している信号灯の断芯または出力配線の断線を検知するに当って、検知装置側の故障があっても誤断芯の検知を防止するに好適な信号灯断芯検知回路を提供することにある。
【０００５】
【課題を解決するための手段】
上記課題を解決するために、断芯検知用診断電流供給回路に診断電流供給スイッチ、電圧検知回路に検知選択スイッチを設けると共に、診断電流検知回路および電圧検知回路にそれぞれ診断電流検知素子を設け、両スイッチをオン設定し、このときのそれぞれの診断電流検知素子のオン状態とオフ状態の検知パターンから信号灯の断芯または出力配線の断線の有無、診断電流供給回路および電圧検知回路の故障を検知する信号灯断芯検知回路であって、
診断電流検知回路および電圧検知回路のそれぞれの診断電流検知素子間に強制断芯スイッチを有する模擬断芯回路を付加し、診断電流供給スイッチと検知選択スイッチをオフ設定すると共に、強制断芯スイッチをオン設定し、このときのそれぞれの診断電流検知素子のオン状態とオフ状態の検知パターンから診断電流検知回路および電圧検知回路のそれぞれの診断電流検知素子の故障を検知する。
【０００６】
【発明の実施の形態】
以下、本発明の実施形態を図面を用いて説明する。
図１は、本発明の信号灯断芯検知回路の一実施形態を示す。図１において、電源７に出力配線５と出力素子（トライアック）８を介して信号灯４を接続する。出力素子（トライアック）８と並列に診断電流検知回路２と断芯検知用診断電流供給回路１の直列回路を接続し、出力素子（トライアック）８の出力端に電圧検知回路３を信号灯４と並列に接続する。また、断芯検知用診断電流供給回路１と診断電流検知回路２の接続点と電圧検知回路３の間に模擬断芯回路９を接続する。
ここで、断芯検知用診断電流供給回路１は、診断電流供給スイッチ１３と抵抗２４からなり、診断電流検知回路２はフォトカプラ１７を有する。電圧検知回路３は、検知選択スイッチ１４、フォトカプラ１５および抵抗２６からなる。模擬断芯回路９は、強制断芯スイッチ１６と抵抗２５からなる。
本実施形態の動作時（信号灯点灯時）は、出力素子（トライアック）８が制御するゲート信号１２によってオンされ、信号灯４に電源７が供給され、信号灯４を点灯する。本実施形態の非動作時（信号灯消灯時）つまり出力素子（トライアック）８がオフ状態の時に、非動作中の信号灯４に断芯検知の診断電流６を流がし、断芯検知を行う。
【０００７】
信号灯４の断芯を検知する動作を説明する。断芯検知は、断芯検知用診断電流供給回路１の診断電流供給スイッチ１３と、電圧検知回路３の検知選択スイッチ１４をオンにする。このとき、信号灯４が正常（断芯していない状態）でかつ出力配線５が断線していなければ（以下、単に「信号灯４の正常」ともいう）、断芯検知の診断電流６は抵抗２４を介して信号灯４側に流れる。このとき、信号灯４のインピーダンスｒ１と出力配線５のインピーダンスｒ２は抵抗２４に比べて非常に小さいため、電圧検知回路３に印加される電圧は小さいものとなる。この結果、診断電流検知回路２のフォトカプラ１７はオンし、電圧検知回路３のフォトカプラ１５はオフであり、信号灯４が正常（断芯していない状態）でかつ出力配線５が断線していないことが分かる。
一方、信号灯４が断芯または出力配線５が断線していれば（以下、単に「信号灯４の断芯」ともいう）、信号灯４のインピーダンスｒ１または出力配線５のインピーダンスｒ２は抵抗２４に比べて非常に大きな値となるため、診断電流６は電圧検知回路３の方へ流れ、電圧検知回路３には高い電圧が印加されることになり、フォトカプラ１５がオンし、また、フォトカプラ１７もオンし、この結果、信号灯４の断芯または出力配線５の断線を検知する。
ここで、診断電流検知回路２は、断芯検知中に診断電流６が流れていることを検知するものであり、断芯検知中に診断電流検知回路２のフォトカプラ１７がオンしていれば、断芯検知が正常に行われていることを表し、オフであれば、検知回路電源７の喪失を含めて断芯検知用診断電流供給回路１の回路がオープン故障であるか、または、電圧検知回路３の回路がオープン故障（信号灯４が断芯していることを前提にして）であると判別する。
【０００８】
本実施形態では、模擬断芯回路９を付加しており、この強制断芯スイッチ１６を用いて診断電流検知回路２のフォトカプラ１７と電圧検知回路３のフォトカプラ１５の故障（オープン/ショート）を判別する。
診断電流供給スイッチ１３と検知選択スイッチ１４および強制断芯スイッチ１６が全てオフの状態であるとき、フォトカプラ１７とフォトカプラ１５がいずれもオフ状態であれば、フォトカプラ１７とフォトカプラ１５は正常であると判別する。
また、診断電流供給スイッチ１３と検知選択スイッチ１４をオフし、強制断芯スイッチ１６をオンにしたとき、フォトカプラ１５とフォトカプラ１７がいずれもオン状態であれば、フォトカプラ１７とフォトカプラ１５はいずれも正常であると判別する。
しかし、診断電流供給スイッチ１３と検知選択スイッチ１４をオフし、強制断芯スイッチ１６をオンにしたとき、フォトカプラ１７がオン状態であり、フォトカプラ１５がオフ状態であれば、フォトカプラ１５はオープンまたはショート故障であると判別する。
また、フォトカプラ１７がオフ状態であり、フォトカプラ１５がオン状態であれば、フォトカプラ１７はオープンまたはショート故障であると判別する。
さらに、フォトカプラ１７とフォトカプラ１５がいずれもオフ状態であれば、フォトカプラ１７とフォトカプラ１５はいずれもオープンまたはショート故障であると判別する。
【０００９】
図２に、以上説明した各スイッチの設定と検知パターンと判定の関係を示す。図２において、例えばＮＯ．１の診断電流供給スイッチ１３と検知選択スイッチ１４がオンであり、強制断芯スイッチ１６がオフであるとき、フォトカプラ１７がオン状態、フォトカプラ１５がオフ状態のとき、信号灯４は正常であると判定するが、これは、フォトカプラ１５がオープンまたはショート故障であっても同様の判定を行うことになる。そこで、ＮＯ．６のように強制断芯スイッチ１６を用いてこれをオンとし、診断電流供給スイッチ１３と検知選択スイッチ１４をオフにして、その検知パターンであるフォトカプラ１７がオン状態であり、フォトカプラ１７がオフ状態であることをみることによって、そのフォトカプラ１５がオープンまたはショート故障を起していると判別することができる。
また、ＮＯ．３の診断電流供給スイッチ１３と検知選択スイッチ１４がオンであり、強制断芯スイッチ１６がオフであるとき、フォトカプラ１７とフォトカプラ１５がいずれもオフ状態のとき、検知回路電源７の喪失を含めて断芯検知用診断電流供給回路１の回路がオープン故障であるか、または、電圧検知回路３の回路がオープン故障（信号灯４が断芯していることを前提にして）であると判別するが、さらに、ＮＯ．８のように強制断芯スイッチ１６を用いてこれをオンとし、診断電流供給スイッチ１３と検知選択スイッチ１４をオフにして、その検知パターンであるフォトカプラ１５とフォトカプラ１７がいずれもオフ状態であることをみることによって、そのフォトカプラ１５とフォトカプラ１７がオープンまたはショート故障を起していると判別することができる。
このように、本実施形態では、診断電流供給スイッチ１３と検知選択スイッチ１４および強制断芯スイッチ１６のオンオフの組み合わせ、フォトカプラ１５とフォトカプラ１７の検知パターンから信号灯４の断芯、診断電流供給回路１および電圧検知回路３の故障を検知することができ、さらに、検知パターンを示すフォトカプラ１５およびフォトカプラ１７の故障を検知することができる。
【００１０】
図３は、本発明の他の実施形態を示す。本実施形態は、多灯信号機である３現示信号機に本発明を適用した例である。
本実施形態では、電流検知回路２のフォトカプラ１７と電圧検知回路３のフォトカプラ１５を共通とし、断芯検知は、断芯検知用診断電流供給回路１の断芯検知したい信号灯４に対応する診断電流供給スイッチ１３と、電圧検知回路３の対応する検知選択スイッチ１４がオンすることにより、対応する信号灯４の断芯検知を可能とするものである。
ここで、本実施形態の断芯検知の原理は、図１に示す実施形態と同じである。ただ、本実施形態では、電圧検知回路３にツェナーダイオード１１を付加する。
【００１１】
ここでは、図４を用いて、３現示信号機において他の信号灯を動作中（点灯中）に、非動作中（消灯中）の信号灯を断芯検知する場合の断芯検知動作について説明する。
出力素子（トライアック）１８がオンすると、信号灯１９は動作状態（点灯中）となり、信号灯１９の点灯電流２０はコモン側配線１０に流れる。このとき信号灯側のコモン側と電圧検知回路３のコモン側間の電圧（Ｖ１）２２は、点灯電流（Ｉ１）２０とした場合、Ｉ１×コモン側配線インピーダンスｒ２＝Ｖ１となる。また、断芯検知中の非動作中（消灯中）の信号灯４が正常（断芯していない）である場合には、信号灯４に微少な断芯検知の診断電流６が流れるが、信号灯４のインピーダンスｒ１が極めて小さいため、信号灯４の両端電圧は非常に小さく、電圧検知回路３に印加される電圧（Ｖ２）２３は、Ｖ２≒Ｖ１となる。なお、電圧検知回路３の一端をアース電位２１とする。
本実施形態では、電圧検知回路３に付加したツェナーダイオード１１のツェナー電圧ＶＺをＶ２≦ＶＺとし、他の信号灯が動作中に電圧検知回路３にＶ２程度の電圧が印加されても、電圧検知回路３のフォトカプラ１５に電流が流れないようにする。このことで信号灯４が正常（断芯していない状態）でも断芯と誤検知されるのを防止している。
なお、本実施形態では、信号灯を点灯する電源と断芯検知用の検知回路電源を交流電源として共用としているが、直流電源または別電源としても同様の動作となる。
【００１２】
【発明の効果】
以上説明したように、本発明によれば、断芯検知用診断電流供給回路と、診断電流検知回路と、電圧検知回路を設けることにより、消灯している信号灯の断芯または出力配線の断線を検知し、長期間点灯していない信号灯を点灯しようとした時に信号灯の断芯または出力配線の断線により点灯できないという事象を未然に回避することができる。
また、電圧検知回路に印加される電圧の大小を検知することにより、信号灯の断芯または出力配線の断線の有無を検知することができ、電源の喪失した場合や断芯検知用診断電流供給回路および電圧検知回路がオープン故障した場合でも、信号灯が正常でありながら、誤って断芯と検知されることを防止することができる。
また、診断電流供給スイッチと検知選択スイッチおよび強制断芯スイッチのオンオフの組み合わせ、診断電流検知回路と電圧検知回路のそれぞれに設けたフォトカプラの検知パターンから容易かつ確実に信号灯の断芯または出力配線の断線、断芯検知用診断電流供給回路および電圧検知回路の故障を検知することができ、さらに、検知パターンを呈するフォトカプラの故障を検知することができる。
【図面の簡単な説明】
【図１】本発明の信号灯断芯検知回路の一実施形態
【図２】本発明の断芯検知の判定結果を説明する表図
【図３】本発明の他の実施形態（３現示信号機の場合）
【図４】本発明の他の実施形態における断芯検知を説明する図
【符号の説明】
１…断芯検知用診断電流供給回路、２…診断電流検知回路、３…電圧検知回路、４…信号灯、５…出力配線、６…断芯検知の診断電流、７…検知回路電源（信号灯電源）、８…出力素子、９…模擬断芯回路、１０…多灯信号機配線時のコモン側共通配線、１１…ツェナ−ダイオード、１２…ゲート信号、１３…断芯検知用診断電流供給回路の診断電流供給スイッチ、１４…電圧検知回路の検知選択スイッチ、１５…電圧検知回路のフォトカプラ、１６…模擬断芯回路の強制断芯スイッチ、１７…診断電流検知回路のフォトカプラ、１８…出力素子（トライアック）、１９…動作中（点灯中）の信号灯、２０…点灯中の信号灯に流れる電流Ｉ１、２１…電圧検知回路のコモン側電圧レベル（０Ｖ）、２２…信号灯側のコモン側と電圧検知回路のコモン側間の電圧Ｖ１、２３…他の信号灯が動作中に非動作中の信号灯の断芯検知中に電圧検知回路に印加される電圧Ｖ２[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a signal lamp disconnection detection circuit of a railway signal device, and more particularly to a technique for detecting disconnection of a signal lamp and a disconnection of an output wiring that are not operating (turned off).
[0002]
[Prior art]
Conventionally, as a disconnection detection circuit for detecting disconnection of a signal lamp when it is not operating (when the signal lamp is turned off), a small current is supplied to the signal lamp when it is not operating, There is a technique for detecting disconnection, and such a signal lamp disconnection detection technique is disclosed in Japanese Utility Model Publication No. 7-37187.
[0003]
[Problems to be solved by the invention]
In the conventional technology, even if the power source that excites the detection relay is lost during the disconnection detection or the detection circuit is open, the detection result will be the same as the actual disconnection. Cannot be distinguished from the core. For this reason, it may be detected that the signal lamp is broken while the signal lamp is normal.
[0004]
An object of the present invention is to prevent detection of erroneous disconnection even when there is a failure on the detection device side in detecting disconnection of a signal lamp that is not operating (when the signal lamp is turned off) or disconnection of an output wiring. An object of the present invention is to provide a suitable signal lamp breakage detection circuit.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, a diagnostic current supply switch for the disconnection detection diagnostic circuit and a detection selection switch for the voltage detection circuit are provided, and a diagnostic current detection element is provided for each of the diagnostic current detection circuit and the voltage detection circuit, Set both switches to ON, and detect the presence or absence of disconnection of the signal lamp or disconnection of the output wiring, the failure of the diagnostic current supply circuit, and the voltage detection circuit from the ON / OFF detection patterns of the respective diagnostic current detection elements. A signal lamp break detection circuit
A simulated disconnection circuit having a forced disconnection switch is added between the diagnostic current detection elements of the diagnosis current detection circuit and the voltage detection circuit, the diagnostic current supply switch and the detection selection switch are set to OFF, and the forced disconnection switch is It is set to ON, and the failure of each diagnostic current detection element of the diagnostic current detection circuit and the voltage detection circuit is detected from the detection pattern of the ON state and the OFF state of each diagnostic current detection element.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an embodiment of a signal lamp breakage detection circuit of the present invention. In FIG. 1, a signal lamp 4 is connected to a power source 7 via an output wiring 5 and an output element (triac) 8. A series circuit of a diagnostic current detection circuit 2 and a disconnection detection diagnostic current supply circuit 1 is connected in parallel with the output element (triac) 8, and the voltage detection circuit 3 is connected in parallel with the signal lamp 4 at the output end of the output element (triac) 8. Connect to. Further, a simulated disconnection circuit 9 is connected between the connection point between the disconnection detection diagnostic current supply circuit 1 and the diagnosis current detection circuit 2 and the voltage detection circuit 3.
Here, the diagnostic current supply circuit 1 for detecting disconnection includes a diagnostic current supply switch 13 and a resistor 24, and the diagnostic current detection circuit 2 includes a photocoupler 17. The voltage detection circuit 3 includes a detection selection switch 14, a photocoupler 15, and a resistor 26. The simulated disconnection circuit 9 includes a forced disconnection switch 16 and a resistor 25.
During the operation of the present embodiment (when the signal lamp is lit), the signal lamp 4 is turned on by being turned on by the gate signal 12 controlled by the output element (triac) 8 and the signal lamp 4 is lit. When the present embodiment is not in operation (when the signal lamp is turned off), that is, when the output element (triac) 8 is in an OFF state, the diagnosis current 6 for detecting the disconnection is supplied to the signal lamp 4 that is not operating to detect the disconnection.
[0007]
An operation for detecting disconnection of the signal lamp 4 will be described. In the disconnection detection, the diagnostic current supply switch 13 of the disconnection detection diagnostic current supply circuit 1 and the detection selection switch 14 of the voltage detection circuit 3 are turned on. At this time, if the signal lamp 4 is normal (in a state where the core is not disconnected) and the output wiring 5 is not disconnected (hereinafter, also simply referred to as “normality of the signal lamp 4”), the diagnostic current 6 for detecting the disconnection is a resistance 24. Flows to the signal lamp 4 side. At this time, since the impedance r1 of the signal lamp 4 and the impedance r2 of the output wiring 5 are very small compared to the resistor 24, the voltage applied to the voltage detection circuit 3 is small. As a result, the photocoupler 17 of the diagnostic current detection circuit 2 is turned on, the photocoupler 15 of the voltage detection circuit 3 is turned off, the signal lamp 4 is normal (in a state where the core is not disconnected), and the output wiring 5 is disconnected. I understand that there is no.
On the other hand, if the signal lamp 4 is disconnected or the output wiring 5 is disconnected (hereinafter also simply referred to as “the disconnection of the signal lamp 4”), the impedance r1 of the signal lamp 4 or the impedance r2 of the output wiring 5 is compared to the resistor 24. Since the value becomes very large, the diagnostic current 6 flows toward the voltage detection circuit 3, and a high voltage is applied to the voltage detection circuit 3, the photocoupler 15 is turned on, and the photocoupler 17 is also turned on. As a result, disconnection of the signal lamp 4 or disconnection of the output wiring 5 is detected.
Here, the diagnostic current detection circuit 2 detects that the diagnostic current 6 flows during the disconnection detection, and if the photocoupler 17 of the diagnostic current detection circuit 2 is turned on during the disconnection detection. Represents that the disconnection detection is normally performed, and if it is OFF, the circuit of the disconnection detection diagnostic current supply circuit 1 including the loss of the detection circuit power supply 7 is an open failure or voltage It is determined that the circuit of the detection circuit 3 is an open failure (assuming that the signal lamp 4 is disconnected).
[0008]
In this embodiment, a simulated disconnection circuit 9 is added, and this forced disconnection switch 16 is used to cause a failure (open / short) of the photocoupler 17 of the diagnostic current detection circuit 2 and the photocoupler 15 of the voltage detection circuit 3. Is determined.
When the diagnostic current supply switch 13, the detection selection switch 14, and the forced disconnection switch 16 are all off, if the photocoupler 17 and the photocoupler 15 are all off, the photocoupler 17 and the photocoupler 15 are normal. It is determined that
When the diagnostic current supply switch 13 and the detection selection switch 14 are turned off and the forced disconnection switch 16 is turned on, if both the photocoupler 15 and the photocoupler 17 are in the on state, the photocoupler 17 and the photocoupler 15 Are determined to be normal.
However, when the diagnostic current supply switch 13 and the detection selection switch 14 are turned off and the forced disconnection switch 16 is turned on, if the photocoupler 17 is on and the photocoupler 15 is off, the photocoupler 15 is Judged as an open or short circuit failure.
If the photocoupler 17 is in an off state and the photocoupler 15 is in an on state, it is determined that the photocoupler 17 is in an open or short circuit failure.
Further, if both the photocoupler 17 and the photocoupler 15 are in the OFF state, it is determined that both the photocoupler 17 and the photocoupler 15 are open or short-circuited.
[0009]
FIG. 2 shows the relationship between the setting of each switch described above, the detection pattern, and the determination. In FIG. When the diagnostic current supply switch 13 and the detection selection switch 14 are on, the forced disconnection switch 16 is off, the photocoupler 17 is on, and the photocoupler 15 is off, the signal lamp 4 is normal. In this case, the same determination is made even if the photocoupler 15 is open or short-circuited. Therefore, NO. As shown in FIG. 6, the forced disconnection switch 16 is turned on, the diagnostic current supply switch 13 and the detection selection switch 14 are turned off, and the photocoupler 17 that is the detection pattern is in the on state. By looking at the OFF state, it can be determined that the photocoupler 15 has an open or short failure.
In addition, NO. When the diagnostic current supply switch 13 and the detection selection switch 14 of FIG. 3 are on, the forced disconnection switch 16 is off, and the photocoupler 17 and the photocoupler 15 are both off, the detection circuit power supply 7 is lost. Whether the circuit of the diagnostic current supply circuit 1 for disconnection detection includes an open fault or the circuit of the voltage detection circuit 3 is determined to be an open fault (assuming that the signal lamp 4 is disconnected). However, NO. As shown in FIG. 8, the forced disconnection switch 16 is turned on, the diagnostic current supply switch 13 and the detection selection switch 14 are turned off, and the photocoupler 15 and the photocoupler 17 which are detection patterns are both in the off state. By seeing something, it can be determined that the photocoupler 15 and the photocoupler 17 are open or short-circuited.
As described above, in this embodiment, the diagnostic current supply switch 13, the detection selection switch 14, and the forced disconnection switch 16 are turned on / off, the signal lamp 4 is disconnected from the detection pattern of the photocoupler 15 and the photocoupler 17, and the diagnostic current is supplied. The failure of the circuit 1 and the voltage detection circuit 3 can be detected, and further, the failure of the photocoupler 15 and the photocoupler 17 indicating the detection pattern can be detected.
[0010]
FIG. 3 shows another embodiment of the present invention. The present embodiment is an example in which the present invention is applied to a three-display signal that is a multi-lamp signal.
In the present embodiment, the photocoupler 17 of the current detection circuit 2 and the photocoupler 15 of the voltage detection circuit 3 are shared, and the disconnection detection corresponds to the signal lamp 4 that the disconnection detection diagnostic current supply circuit 1 desires to detect the disconnection. When the diagnosis current supply switch 13 and the corresponding detection selection switch 14 of the voltage detection circuit 3 are turned on, the disconnection of the corresponding signal lamp 4 can be detected.
Here, the principle of the disconnection detection of the present embodiment is the same as that of the embodiment shown in FIG. However, in this embodiment, a Zener diode 11 is added to the voltage detection circuit 3.
[0011]
Here, with reference to FIG. 4, the disconnection detection operation in the case where the disconnection detection is performed on the signal lamp that is not operating (turned off) while the other signal lamps are operating (lighting) in the three-display signal device will be described.
When the output element (triac) 18 is turned on, the signal lamp 19 is in an operating state (lighting), and the lighting current 20 of the signal lamp 19 flows through the common side wiring 10. At this time, the voltage (V1) 22 between the common side on the signal lamp side and the common side of the voltage detection circuit 3 is I1 × common-side wiring impedance r2 = V1 when the lighting current (I1) 20 is set. In addition, when the signal lamp 4 that is not operating (turned off) during disconnection detection is normal (not disconnected), a small diagnostic current 6 for detecting disconnection flows through the signal lamp 4, but the signal lamp 4 Since the impedance r1 of the signal lamp 4 is extremely small, the voltage across the signal lamp 4 is very small, and the voltage (V2) 23 applied to the voltage detection circuit 3 is V2≈V1. One end of the voltage detection circuit 3 is set to the ground potential 21.
In this embodiment, the Zener voltage VZ of the Zener diode 11 added to the voltage detection circuit 3 is set to V2 ≦ VZ, and even if a voltage of about V2 is applied to the voltage detection circuit 3 while another signal lamp is operating, the voltage detection circuit 3 so that no current flows through the photocoupler 15. This prevents erroneous detection of disconnection even when the signal lamp 4 is normal (in a state where disconnection is not performed).
In this embodiment, the power source for turning on the signal lamp and the detection circuit power source for detecting disconnection are shared as the AC power source, but the same operation is performed when the DC power source or another power source is used.
[0012]
【The invention's effect】
As described above, according to the present invention, by providing the diagnostic current supply circuit for disconnection detection, the diagnostic current detection circuit, and the voltage detection circuit, the disconnection of the signal lamp that is turned off or the disconnection of the output wiring is prevented. It is possible to avoid an event that the light cannot be turned on due to the disconnection of the signal light or the disconnection of the output wiring when the signal light that has been detected and is not lighted for a long time is detected.
In addition, by detecting the magnitude of the voltage applied to the voltage detection circuit, it is possible to detect the presence or absence of signal lamp disconnection or output wiring disconnection. When the power supply is lost or a disconnection detection diagnostic current supply circuit Even when the voltage detection circuit has an open failure, it can be prevented that the disconnection is erroneously detected while the signal lamp is normal.
In addition, the combination of the diagnostic current supply switch, detection selection switch, and forced disconnection switch on / off, and the detection pattern of the photocoupler provided in each of the diagnostic current detection circuit and voltage detection circuit, easily and reliably disconnect the signal lamp or output wiring. Disconnection, disconnection detection diagnostic current supply circuit, and voltage detection circuit failure can be detected, and further, a photocoupler failure that exhibits a detection pattern can be detected.
[Brief description of the drawings]
FIG. 1 is an embodiment of a signal lamp breakage detection circuit according to the present invention. FIG. 2 is a table for explaining the determination result of breakage detection according to the present invention. in the case of)
FIG. 4 is a diagram for explaining disconnection detection in another embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 ... Diagnostic current supply circuit for disconnection detection, 2 ... Diagnostic current detection circuit, 3 ... Voltage detection circuit, 4 ... Signal lamp, 5 ... Output wiring, 6 ... Diagnosis current for disconnection detection, 7 ... Detection circuit power supply (Signal lamp power supply) ), 8... Output element, 9... Simulated disconnection circuit, 10. Common common wiring when wiring with multiple lamps, 11. Zener diode, 12. Gate signal, 13. Current supply switch, 14 ... Detection selection switch of voltage detection circuit, 15 ... Photocoupler of voltage detection circuit, 16 ... Forced disconnection switch of simulated disconnection circuit, 17 ... Photocoupler of diagnostic current detection circuit, 18 ... Output element ( Triac), 19: Signal lamp in operation (lighting), 20: Current I1, 21 flowing in the signal lamp being lit: Voltage level common to voltage detection circuit (0V), 22: Voltage detection circuit common side and voltage detection circuit of Voltage Voltage V1,23 ... other lights between Mont side is applied to the voltage detection circuit in the cross-sectional core detection signal lamp in the non-operation during operation V2

Claims (1)

断芯検知用の検知回路電源と非動作中（消灯中）の信号灯へ断芯検知の診断電流を前記信号灯への出力配線を経由して供給する断芯検知用診断電流供給回路と、前記診断電流供給回路から断芯検知の診断電流が供給されたことを検知する診断電流検知回路と、前記信号灯への出力配線間に接続される電圧検知回路からなり、
前記診断電流供給回路に診断電流供給スイッチ、前記電圧検知回路に検知選択スイッチを設けると共に、前記診断電流検知回路および前記電圧検知回路にそれぞれ診断電流検知素子を設け、前記両スイッチをオン設定し、このときの前記それぞれの診断電流検知素子のオン状態とオフ状態の検知パターンから前記信号灯の断芯または出力配線の断線の有無、前記診断電流供給回路および前記電圧検知回路の故障を検知する信号灯断芯検知回路であって、
前記診断電流検知回路および前記電圧検知回路のそれぞれの診断電流検知素子間に強制断芯スイッチを有する模擬断芯回路を付加し、前記診断電流供給スイッチと前記検知選択スイッチをオフ設定すると共に、前記強制断芯スイッチをオン設定し、このときの前記それぞれの診断電流検知素子のオン状態とオフ状態の検知パターンから前記診断電流検知回路および前記電圧検知回路のそれぞれの診断電流検知素子の故障を検知することを特徴とする信号灯断芯検知回路。 A diagnostic current supply circuit for detecting a disconnection that supplies a diagnostic current for detecting a disconnection to a signal lamp that is not operating (turned off) via a detection circuit power supply for detecting the disconnection, and the diagnosis A diagnostic current detection circuit that detects that a diagnostic current for disconnection detection is supplied from a current supply circuit, and a voltage detection circuit that is connected between output wires to the signal lamp,
A diagnostic current supply switch is provided in the diagnostic current supply circuit, a detection selection switch is provided in the voltage detection circuit, a diagnostic current detection element is provided in each of the diagnostic current detection circuit and the voltage detection circuit, and both switches are set to ON. At this time, the signal lamp is detected to detect the disconnection of the signal lamp or the output wiring, the failure of the diagnostic current supply circuit and the voltage detection circuit from the detection pattern of the ON state and the OFF state of each of the diagnostic current detection elements. A lead detection circuit,
A simulated disconnection circuit having a forced disconnection switch is added between the diagnostic current detection elements of the diagnostic current detection circuit and the voltage detection circuit, and the diagnostic current supply switch and the detection selection switch are turned off, Turn on the forced disconnection switch and detect the failure of the diagnostic current detection elements of the diagnostic current detection circuit and the voltage detection circuit from the detection patterns of the on state and off state of the respective diagnostic current detection elements at this time A signal lamp breakage detection circuit.
JP2002229809A 2002-08-07 2002-08-07 Signal lamp disconnection detection circuit Expired - Fee Related JP4102615B2 (en)

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