JPS5832760B2 - Disconnection detection device - Google Patents
Disconnection detection deviceInfo
- Publication number
- JPS5832760B2 JPS5832760B2 JP52123826A JP12382677A JPS5832760B2 JP S5832760 B2 JPS5832760 B2 JP S5832760B2 JP 52123826 A JP52123826 A JP 52123826A JP 12382677 A JP12382677 A JP 12382677A JP S5832760 B2 JPS5832760 B2 JP S5832760B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- potential
- input terminal
- terminal
- inverting input
- 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
Links
- 238000001514 detection method Methods 0.000 title claims description 38
- 230000004397 blinking Effects 0.000 claims description 12
- 230000002265 prevention Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Description
【発明の詳細な説明】
この発明は、たとえば浮標灯の電球などの負荷の断線を
検出する断線検出装置に関し、点滅などにかかわらず常
に検出することを目的とする。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disconnection detection device for detecting disconnection of a load such as a light bulb of a buoy light, and an object of the present invention is to constantly detect disconnection regardless of whether the load is blinking or the like.
一般に、浮標灯においては、日光弁の動作により夜間に
のみ点滅器を作動して負荷である電球の供給電流を制御
し、電数を点滅させる。Generally, in buoy lights, the flasher is operated only at night by the operation of the daylight valve to control the current supplied to the light bulb that is the load, causing the number of lights to flash.
そして従来の浮標灯における電球の断線の検出は、点滅
器が作動する夜間の点灯時にしか行なえず、また、点灯
時間が非常に短かい灯質の場合は、電球交換器の動作が
不確実であり、さらに、昼間における電球交換器の点検
作業がきわめて困難である。Detection of bulb breakage in conventional buoy lights can only be done at night when the flasher is activated, and if the lighting is of very short duration, the operation of the bulb changer may be uncertain. Furthermore, it is extremely difficult to inspect light bulb changers during the day.
この発明は、前記の点に留意してなされたものであり、
一方の直流電源端子と点滅制御端子との間に直列接続さ
れた負荷および電流検出抵抗と、前記点滅制御端子を選
択的に他方の直流電源端子に接続する点滅器と、前記電
流検出抵抗の前記負荷側の一端の電位と当該抵抗の他端
の電位とを比較し、前記他端の電位が前記−隊の電位よ
り低下すると出力信号が電源電圧より低圧の・・イ信号
からロー信号に変化する第１電圧比較器と、一方の入力
端子が前記第１電圧比較器の出力端子に接続された第２
電圧比較器と、逆流防止ダイオードを介して前記ハイ信
号の電圧と前記ロー信号の電圧との間の所定バイアス電
圧を前記第２電圧比較器の他方の入力端子に入力する基
準電圧発生器と、前記点滅制御端子と前記他方の入力端
子との間に設けられた電圧検出抵抗とを備えたことを特
徴とする断線検出装置を提供するものである。This invention was made with the above points in mind,
a load and a current detection resistor connected in series between one DC power supply terminal and a blinking control terminal; a blinker selectively connecting the blinking control terminal to the other DC power supply terminal; The potential at one end of the load side is compared with the potential at the other end of the resistor, and when the potential at the other end falls below the potential at the negative end, the output signal changes from a signal lower than the power supply voltage to a low signal. a first voltage comparator having one input terminal connected to the output terminal of the first voltage comparator;
a voltage comparator; a reference voltage generator that inputs a predetermined bias voltage between the high signal voltage and the low signal voltage to the other input terminal of the second voltage comparator via a reverse current prevention diode; The present invention provides a disconnection detection device characterized by comprising a voltage detection resistor provided between the blinking control terminal and the other input terminal.
したがって、この発明の断線検出装置によると、点滅器
による負荷の点滅などに無関係に、常に負荷の断線を検
出することができ、たとえば浮標灯などの電球の断線検
出が常時前なえるものである。Therefore, according to the disconnection detection device of the present invention, disconnection of the load can always be detected regardless of whether the load is flashed by a flasher, and for example, disconnection of a light bulb such as a buoy light can always be detected.
つぎに、この発明を、その１実施例を示した図面ととも
に詳細に説明する。Next, the present invention will be described in detail with reference to drawings showing one embodiment thereof.
第１図において、１，２は直流電源のプラス端子および
マイナス端子、３は後述の点滅器に接続された点滅制御
端子、４は一端がプラス端子１に接続された負荷である
浮標灯の電球、５は一端が電球４の他端に接続されよ低
抵抗値の電流検出抵抗であり、他端が点滅制御端子３に
接続されている。In Figure 1, 1 and 2 are the positive and negative terminals of a DC power supply, 3 is a flashing control terminal connected to a flasher, which will be described later, and 4 is a light bulb of a buoy lamp, which is a load whose one end is connected to the positive terminal 1. , 5 is a low resistance current detection resistor whose one end is connected to the other end of the light bulb 4, and whose other end is connected to the blinking control terminal 3.
６は電流検出抵抗５の一端とマイナス端子２との間に設
けられた限流抵抗であり、電球４および電流検出抵抗５
より十分大きな抵抗値に設定されている。6 is a current limiting resistor provided between one end of the current detection resistor 5 and the negative terminal 2;
The resistance value is set to a sufficiently larger value.
７は演算増幅器から彦る高性能の第１電圧比較器であり
、反転入力端子Ａが電流検出抵抗５の一端に接続される
とともに、非反転入力端子Ｂが電流検出抵抗５の他端に
接続されている。7 is a high-performance first voltage comparator derived from an operational amplifier, and its inverting input terminal A is connected to one end of the current detection resistor 5, and its non-inverting input terminal B is connected to the other end of the current detection resistor 5. has been done.
８は第１電圧比較器７のオフセット調整用可変抵抗、９
は出力端子が可変抵抗８の摺動子に接続された基準電圧
発生器、１０は一端が点滅制御端子３に接続された電圧
検出抵抗であり、電球４および電流検出抵抗５より十分
大きな抵抗値に設定されている。8 is a variable resistor for adjusting the offset of the first voltage comparator 7; 9
is a reference voltage generator whose output terminal is connected to the slider of the variable resistor 8, and 10 is a voltage detection resistor whose one end is connected to the flashing control terminal 3, whose resistance value is sufficiently larger than that of the light bulb 4 and the current detection resistor 5. is set to .
１１はアノードが基準電圧発生器９に接続されカソード
が電圧検出抵抗１０の他端に接続された逆流防止ダイオ
ード、１２は一方の入力端子である非反転入力端子Ｃと
他方の入力端子である反転入力端子りとを備えた第２電
圧比較器であり、非反転入力端子Ｃが第１電圧比較器Ｔ
の出力端子に接続されるとともに、反転入力端子りが電
圧検出抵抗１０の他端に接続されている。11 is a backflow prevention diode whose anode is connected to the reference voltage generator 9 and whose cathode is connected to the other end of the voltage detection resistor 10, and 12 is a non-inverting input terminal C which is one input terminal and an inverting input terminal which is the other input terminal. A second voltage comparator having an input terminal C, and a non-inverting input terminal C of the first voltage comparator T.
The inverting input terminal is connected to the other end of the voltage detection resistor 10.
１３は日光弁の動作によりマイナス端子２と点滅制御端
子３との間を開閉する点滅器であり、点滅制御端子３を
選択的にマイナス端子２に接続し、電球４の点滅、を制
御する。Reference numeral 13 denotes a blinker that opens and closes between the minus terminal 2 and the blinking control terminal 3 by the operation of a sunlight valve, and the blinking control terminal 3 is selectively connected to the minus terminal 2 to control the blinking of the light bulb 4.
そして第１電圧比較器７は、反転入力端子Ａの電位と非
反転入力端子Ｂの電位とを比較し、非反転入力端子Ｂの
電位が反転入力端子Ａの電位以上のときにたとえば３〜
３０ボルトの電源電圧より１ボルト程度低いハイ信号を
出力し、非反転入力端子Ｂの電位が反転入力端子Ａの電
位より低下したときにたとえば１ボルトのロー信号を出
力する。Then, the first voltage comparator 7 compares the potential of the inverting input terminal A and the potential of the non-inverting input terminal B, and when the potential of the non-inverting input terminal B is equal to or higher than the potential of the inverting input terminal A, the first voltage comparator 7 compares the potential of the inverting input terminal A with the potential of the non-inverting input terminal B.
It outputs a high signal that is about 1 volt lower than the power supply voltage of 30 volts, and outputs a low signal of, for example, 1 volt when the potential of the non-inverting input terminal B becomes lower than the potential of the inverting input terminal A.
また基準電圧発生器９は、前記ノ・可信号の電圧と前記
ロー信号の電圧との間の所定バイアス電圧。Further, the reference voltage generator 9 generates a predetermined bias voltage between the voltage of the above-mentioned signal and the voltage of the low signal.
たとえば１．５ボルトのバイアス電圧を反転入力端子り
に入力するものであう、このときダイオード１１の電圧
降下をＶｆとすれば、基準電圧発生器９の出力端子の電
圧は、（１，５−１−Ｖｆ）ボルトに設定されている。For example, when a bias voltage of 1.5 volts is input to the inverting input terminal, if the voltage drop across the diode 11 is Vf, the voltage at the output terminal of the reference voltage generator 9 is (1,5-1 -Vf) volts.
さらに、第２電圧比較器１２は、非反転入力端子Ｃの電
位と反転入力端子りの電位とを比較し、非反転入力端子
Ｃの電位が反転入力端子りの電位よシ高いときに電球４
の断線を示す・・イレベルの検出信号を出力端子Ｅに出
力し、非反転入力端子Ｃの電位が反転入力端子りの電位
よう低いときに電球４が非断線であることを示すローレ
ベルの検出信号を出力する。Furthermore, the second voltage comparator 12 compares the potential of the non-inverting input terminal C and the potential of the inverting input terminal, and when the potential of the non-inverting input terminal C is higher than the potential of the inverting input terminal, the second voltage comparator 12
A low level detection signal indicating a disconnection is output to the output terminal E, and when the potential of the non-inverting input terminal C is as low as the potential of the inverting input terminal, a low level detection signal indicating that the light bulb 4 is not disconnected is output. Output a signal.
そして電球４が断線していなければ、ｔｏ時の電源投入
により、第２図ｆに示すように、プラス端子１の電位が
Ｏボルトから電源電圧であるｖｂボルトに上昇し、この
とき、同図ｇに示すように、点滅器１３がオンし、点滅
制御端子３とマイナス端子２との間が閉路していれば、
同図ａに示すように、反転入力端子Ａの電位が、電流検
出抵抗５の電圧降下にもとづく１０□リボルトないし１
００□リポルトの間の■１ボルトになる。If the light bulb 4 is not disconnected, when the power is turned on at the time of to, the potential of the positive terminal 1 rises from O volts to Vb volts, which is the power supply voltage, as shown in FIG. As shown in g, if the flasher 13 is turned on and the circuit between the flashing control terminal 3 and the negative terminal 2 is closed,
As shown in Figure a, the potential of the inverting input terminal A varies from 10 volts to 1
It becomes ■1 volt between 00□Rippold.
一方、非反転入力端子Ｂの電位は、第２図すに示すよう
に、マイナス端子２のＯボルトに保持される。On the other hand, the potential at the non-inverting input terminal B is held at O volts at the negative terminal 2, as shown in FIG.
そこで非反転入力端子Ｂの電位が反転入力端子Ａの電位
よジ低くな９、第２図Ｃに示すように、第１電圧比較器
７の出力端子から非反転入力端子Ｃに、■ボルトすなわ
ち■２ボルトのロー信号が出力される。Therefore, when the potential of the non-inverting input terminal B is slightly lower than the potential of the inverting input terminal A, as shown in FIG. ■A low signal of 2 volts is output.
また、非反転入力端子Ｂの電位がＯボルトであるためダ
イオード１１が導通し、第２図ｄに示すように、反転入
力端子りに１．５ボルトすなわち■３ボルトのバイアス
電圧が入力される。Also, since the potential of the non-inverting input terminal B is O volts, the diode 11 becomes conductive, and a bias voltage of 1.5 volts, that is, 3 volts, is input to the inverting input terminal as shown in Fig. 2d. .
したがって非反転入力端子Ｃの電位が反転入力端子りの
電位よシ低くなシ、第２図ｅに示すように、第２電圧比
較器１２から出力端子Ｅに、電球４の非断線を示すロー
レベルの検出信号が出力される。Therefore, if the potential at the non-inverting input terminal C is lower than the potential at the inverting input terminal, a low signal indicating that the light bulb 4 is not disconnected is sent from the second voltage comparator 12 to the output terminal E, as shown in FIG. 2e. A level detection signal is output.
つぎに、電球４が断線していないｔ１時〜ｔ２時の間に
、第２図ｇに示すように、点滅器１３がオフし、点滅制
御端子３とマイナス端子２との間が開路すれば、同図ａ
、ｂに示すように、反転入力端子Ａ、非反転入力端子Ｂ
の電位がｖｂボルトに上昇し、両端子Ａ、Ｈの電位が同
電位になり、同図Ｃに示すように、第１電圧比較器７か
ら非反転入力端子Ｃに、■ｂボルトより１ボルト程度低
い■４ポルトのハイ信号が出力される。Next, between t1 and t2 when the light bulb 4 is not disconnected, as shown in FIG. Diagram a
, b, the inverting input terminal A and the non-inverting input terminal B
The potential at the terminals A and H rises to vb volts, and the potentials at both terminals A and H become the same potential, and as shown in Figure C, the first voltage comparator 7 outputs 1 volt from the b volt to the non-inverting input terminal C. A low-level ■4 port high signal is output.
一方、非反転入力端子Ｂの電位がｖｂボルトになるため
ダイオード１１が非導通になり、第２図ｄに示すように
、反転入力端子りに電圧検出抵抗１０を介したｖｂボル
トの電圧が入力される。On the other hand, since the potential of the non-inverting input terminal B becomes vb volts, the diode 11 becomes non-conductive, and as shown in FIG. be done.
したがって、非反転入力端子Ｃの電位が反転入力端子り
の電位以下に保持され、第２図ｅに示すように、出力端
子Ｅの検出信号はローレベルに保を左づ〉ｈ入
つぎに、点滅器１３がオンしているｔ３時に電球４が断
線すると、電流検出抵抗５に電流が流れなくなり、第２
図ａに示すように、反転入力端子Ａの電位がＯボルトに
なり、非反転入力端子Ｂの電位と同電位になるため、同
図Ｃに示すように、非反転入力端子Ｃにハイ信号が出力
される。Therefore, the potential of the non-inverting input terminal C is kept below the potential of the inverting input terminal, and as shown in FIG. 2e, the detection signal of the output terminal E is kept at a low level. If the light bulb 4 is disconnected at time t3 when the flasher 13 is on, current will no longer flow through the current detection resistor 5 and the second
As shown in Figure a, the potential of the inverting input terminal A becomes O volts, which is the same potential as the potential of the non-inverting input terminal B, so as shown in Figure C, a high signal is output to the non-inverting input terminal C. Output.
一方、ダイオード１１がオンしているため、第２図ｄに
示すように、反転入力端子りにバイアス電圧が入力され
る。On the other hand, since the diode 11 is on, a bias voltage is input to the inverting input terminal as shown in FIG. 2d.
したがって、非反転入力端子Ｃの電位が反転入力端子り
の電位より高くなり、第２図ｅに示すように、出力端子
Ｅの検出信号は電球４の断線を示すハイレベルになる。Therefore, the potential at the non-inverting input terminal C becomes higher than the potential at the inverting input terminal, and the detection signal at the output terminal E goes to a high level indicating that the light bulb 4 is broken, as shown in FIG.
ところで、電球４が断線している１５時に点滅器１３が
オフすると、基準電圧発生器９から、ダイオード１１．
電圧検出抵抗１０．電流検出抵抗５、限流抵抗６を介し
てマイナス端子２に電流が流れ、反転入力端子Ａの電位
が、第２図ａに示すように、限流抵抗６の電圧降下にも
とづく■５ボルト、すなわち１０マイクロボルト程度の
電位になる。By the way, when the flasher 13 is turned off at 15:00 when the light bulb 4 is disconnected, the reference voltage generator 9 outputs a signal from the diode 11.
Voltage detection resistor 10. A current flows to the negative terminal 2 via the current detection resistor 5 and the current limiting resistor 6, and the potential of the inverting input terminal A increases to 5 volts based on the voltage drop across the current limiting resistor 6, as shown in FIG. 2a. In other words, the potential is about 10 microvolts.
また、非反転入力端子Ｂの電位が、第２図すに示すよう
に、限流抵抗６．電流検出抵抗５の電圧降下にもとづ＜
Ｖ６ポルト、すなわちＶ５ポルトより０．０１マイクロ
ボルト程度高い電位になる。Further, the potential of the non-inverting input terminal B is changed to the current limiting resistor 6. Based on the voltage drop of the current detection resistor 5
The potential is V6 port, which is about 0.01 microvolt higher than V5 port.
したがって、第２図Ｃに示すように、非反転入力端子Ｃ
にはハイ信号が入力され続け、同図ｅに示すように、出
力端子Ｅの検出信号はハイレベルに保持される。Therefore, as shown in FIG. 2C, the non-inverting input terminal C
A high signal continues to be input to the terminal E, and the detection signal at the output terminal E is held at a high level, as shown in FIG.
そしてｔ５時に、電球４が非断線のものに取り換えられ
ると、ｔ１時〜ｔ２時の間と同様の動作により、第２図
ｅに示すように、出力端子Ｅの検出信号はローレベルに
なる。Then, at time t5, when the light bulb 4 is replaced with one that does not disconnect, the detection signal at the output terminal E becomes low level as shown in FIG. 2e due to the same operation as between time t1 and time t2.
さらにｔ６時に点滅器１３がオンし、このとき電球４が
非断線であれば、たとえば１０時〜ｔ１時の間と同様の
動作により、第２図ｅに示すように、出力端子Ｅの検出
信号はローレベルに保持される。Furthermore, if the flasher 13 is turned on at time t6 and the light bulb 4 is not disconnected at this time, the detection signal at the output terminal E will be low as shown in FIG. held at the level.
したがって、電球４の非断線期間ＴＡ 、ＴＡ’には、
点滅器１３０オン、オフに無関係に、出力端子Ｅの検出
信号がローレベルになう、電球４の断線期間ＴＢには、
点滅器１３のオン、オフに無関係に前記検出信号がハイ
レベルになう、電球４の点滅にかかわらず電球４の断線
を常に検出することができ、日光弁の作動していなし日
中においても直ちに電球４の断線を検出することができ
る。Therefore, during the non-disconnection periods TA and TA' of the light bulb 4,
During the disconnection period TB of the light bulb 4 during which the detection signal of the output terminal E becomes low level regardless of whether the flasher 130 is on or off,
The detection signal is at a high level regardless of whether the flasher 13 is on or off, and disconnection of the light bulb 4 can always be detected regardless of whether the light bulb 4 is blinking, even during the day when the sunlight valve is not operating. A break in the light bulb 4 can be detected immediately.
そして電源電圧が変動しても、非反転入力端子Ｃの電位
は、非断線期間ＴＡ、ＴＡ’に反転入力端子りの電位よ
り高く、断線期間ＴＢに低くなるため、電源電圧の変動
に無関係に断線を検出することができ、検出動作電圧の
幅が広くなる。Even if the power supply voltage fluctuates, the potential of the non-inverting input terminal C is higher than the potential of the inverting input terminal during the non-disconnection periods TA and TA', and becomes lower during the disconnection period TB, so it is independent of fluctuations in the power supply voltage. Disconnection can be detected, and the range of detection operating voltage is widened.
また、高性能の第１電圧比較器７を設けたことにより数
□リボルトの電圧変動も検出することができるため、電
流検出抵抗５の電圧降下を低くでき、電球４に十分な電
流を供給することができ、電力損失を少なくすることが
できる。Furthermore, by providing the high-performance first voltage comparator 7, it is possible to detect voltage fluctuations of several volts, so the voltage drop across the current detection resistor 5 can be lowered and sufficient current can be supplied to the light bulb 4. It is possible to reduce power loss.
なおこの発明は、前記実施例では浮標灯の電球４の断線
検出に適用したが、ソレノイドや電動機等の一般の負荷
の断線検出などに適用し得ることは勿論である。Although the present invention was applied to detecting a disconnection in the light bulb 4 of a buoy lamp in the above embodiment, it can of course be applied to detecting a disconnection in a general load such as a solenoid or an electric motor.
第１図は、この発明の断線検出装置の１実施例の結線図
、第２図のａ −ｇ図は、第１図の動作説明用のタイ□
ングチャートである。
１・・・プラス端子、２・・・マイナス端子、３・・・
点滅制御端子、４・・・電球、５・・・電流検出抵抗、
７・・・第１電圧比較器、９・・・基準電圧発生器、１
０・・・電圧検出抵抗、１１・・・逆流防止ダイオード
、１２・・・第２電圧比較器、１３・・・点滅器。FIG. 1 is a wiring diagram of one embodiment of the disconnection detection device of the present invention, and diagrams a to g in FIG.
This is a running chart. 1...Positive terminal, 2...Minus terminal, 3...
Flashing control terminal, 4... Light bulb, 5... Current detection resistor,
7... First voltage comparator, 9... Reference voltage generator, 1
0... Voltage detection resistor, 11... Backflow prevention diode, 12... Second voltage comparator, 13... Flasher.
Claims (1)
された負荷および電流検出抵抗と、前記点滅制御端子を
選択的に他方の直流電源端子に接続する点滅器と、前記
電流検出抵抗の前記負荷側の一端の電位と当該抵抗の他
端の電位とを比較し。 前記他端の電位が前記一端の電位より低下すると出力信
号が電源電圧より低圧のハイ記号からロー記号に変化す
る第１電圧比較器と、一方の入力端子が前記第１電圧比
較器の出力端子に接続された第２電圧比較器と、逆流防
止ダイオードを介して前記ハイ信号の電圧と前記ロー信
号の電圧との間の所定バイアス電圧を前記第２電圧比較
器の他方の入力端子に入力する基準電圧発生器と、前記
点滅制御端子と前記他方の入力端子との間に設けられた
電圧検出抵抗とを備えたことを特徴とする断線検出装置
。[Claims] 1. A load and a current detection resistor connected in series between one DC power supply terminal and a blinking control terminal, and a blinker selectively connecting the blinking control terminal to the other DC power supply terminal. , a potential at one end of the current detection resistor on the load side and a potential at the other end of the resistor are compared. a first voltage comparator whose output signal changes from a high sign at a voltage lower than the power supply voltage to a low sign when the potential at the other end is lower than the potential at the one end; and one input terminal is an output terminal of the first voltage comparator. and a predetermined bias voltage between the voltage of the high signal and the voltage of the low signal is input to the other input terminal of the second voltage comparator through a backflow prevention diode. A disconnection detection device comprising: a reference voltage generator; and a voltage detection resistor provided between the blinking control terminal and the other input terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP52123826A JPS5832760B2 (en) | 1977-10-14 | 1977-10-14 | Disconnection detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP52123826A JPS5832760B2 (en) | 1977-10-14 | 1977-10-14 | Disconnection detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5456797A JPS5456797A (en) | 1979-05-08 |
| JPS5832760B2 true JPS5832760B2 (en) | 1983-07-14 |
Family
ID=14870312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP52123826A Expired JPS5832760B2 (en) | 1977-10-14 | 1977-10-14 | Disconnection detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5832760B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2696413B2 (en) * | 1990-01-25 | 1998-01-14 | 株式会社ゼニライトブイ | Light Bulb Bulb Disconnection Detector |
-
1977
- 1977-10-14 JP JP52123826A patent/JPS5832760B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5456797A (en) | 1979-05-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2002520826A (en) | Circuit arrangement and signal light provided with the circuit arrangement | |
| US4190830A (en) | Lamp outage indicator circuit | |
| US3130349A (en) | Flashing light device with automatic daytime shutoff | |
| JP2004122913A (en) | Vehicle lighting fixture | |
| US20050073428A1 (en) | Indicator system having multiple leds | |
| EP0124963B1 (en) | Lamp monitoring circuit | |
| GB2047489A (en) | Signal lamp apparatus with a lamp burnout detecting circuit | |
| NL8201280A (en) | SPARE LIGHTING INSTALLATION. | |
| US4207553A (en) | Control apparatus for vehicle directional lamps | |
| US3422421A (en) | Blinker type signal system with indication of defective blinker lamp | |
| EP1787886B1 (en) | Electrical circuit for an LED signal lamp with a switching threshold for switching between a daylight operation mode and a nighttime operation mode | |
| US3263123A (en) | Flasher circuit for vehicles having fluorescent lights | |
| JP2974104B2 (en) | Circuit for intelligent power switch | |
| KR950000975Y1 (en) | Display circuit for voltage of power source and connection state for sensor wire in a receiver panel of fire alarm | |
| US3668678A (en) | Bulb outage indicator for multi-lamp circuits | |
| GB2266141A (en) | Hazard light control with hysteresis | |
| US3457453A (en) | System for controllably energizing and monitoring the normalcy of successively selectable electrical load devices | |
| KR830002325B1 (en) | Signal light device with disconnection detection circuit | |
| DE2548866A1 (en) | Function control circuit for car electric system - with current reduction detecting single chip operational amplifiers and LED indicators | |
| JPH0241839Y2 (en) | ||
| SU375671A1 (en) | DEVICE FOR SIGNALING | |
| JPS6345806Y2 (en) | ||
| JPS58122236A (en) | Disconnection detection circuit for vehicle lamps | |
| KR890006732Y1 (en) | Alarm circuit for battery voltage drop | |
| JPS5811627Y2 (en) | Transistor type turn signal. Hazard dual purpose flashier |