JPH07118392B2 - Light bulb disconnection detection method - Google Patents
Light bulb disconnection detection methodInfo
- Publication number
- JPH07118392B2 JPH07118392B2 JP2024693A JP2469390A JPH07118392B2 JP H07118392 B2 JPH07118392 B2 JP H07118392B2 JP 2024693 A JP2024693 A JP 2024693A JP 2469390 A JP2469390 A JP 2469390A JP H07118392 B2 JPH07118392 B2 JP H07118392B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- detection
- light bulb
- bulb
- current
- 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 - Fee Related
Links
Description
【発明の詳細な説明】 （イ）産業上の利用分野 この発明は例えば灯浮標の照明用等の電球断芯検出方法
に関する。DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a method for detecting a burnout of a light bulb, such as for lighting a buoy.
（ロ）従来の技術 従来、灯浮標において、照明用の電球の断芯を検出する
方法として、第４図に示すように電球（１）の回路に、
検出抵抗（２）を直列に挿入し、この抵抗の両端に発生
する電圧をオペアンプ（４）を介して、電流信号として
取り出す、即ち、検出抵抗の両端に発生する電圧の有無
によって、断芯の検出を行う方法がとられていた。(B) Conventional Technology Conventionally, in a lamp buoy, as a method for detecting disconnection of a light bulb for illumination, a circuit of a light bulb (1) as shown in FIG.
The detection resistor (2) is inserted in series, and the voltage generated at both ends of this resistor is taken out as a current signal via the operational amplifier (4), that is, the presence or absence of the voltage generated at both ends of the detection resistor causes disconnection. The method of detection was taken.
（ハ）発明が解決しようとする問題点 このような従来の方法は、検出抵抗での電圧降下ロスを
少なくするためには、抵抗値をできるだけ下げる必要が
あるが、抵抗値があまり低いと、小電流の電球を使用し
た場合、検出抵抗での発生電圧が低く、検出が困難であ
り、また、逆に検出抵抗を大きくすると、小電流の場合
でも検出できる反面大電流の電球を使用したときの電圧
ロスが大きくなるという欠点がある。(C) Problems to be Solved by the Invention In such a conventional method, in order to reduce the voltage drop loss in the detection resistor, it is necessary to lower the resistance value as much as possible, but if the resistance value is too low, When a light bulb with a small current is used, the voltage generated at the detection resistor is low and detection is difficult.On the contrary, if a detection resistor is increased, it can be detected even with a small current, but when a light bulb with a large current is used. However, there is a drawback that the voltage loss becomes large.
例えば、検出抵抗値0.1Ω、使用電球電圧12Vとすると、
電球電流0.25Aのときの検出（ロス）電圧は0.025Vであ
るが、電球電流8Aのときの検出（ロス）電圧は0.8Vとな
る。For example, if the detection resistance value is 0.1Ω and the bulb voltage used is 12V,
The detection (loss) voltage at a bulb current of 0.25A is 0.025V, but the detection (loss) voltage at a bulb current of 8A is 0.8V.
即ち、0.25A電球では、電球電圧の低下は0.2％と低い
が、検出電圧としては低い値であり検出困難となる。逆
に8A電球では0.8Vと検出には充分な電圧が発生するが、
電球電圧の低下も6.7％と大きくなる。That is, with the 0.25A light bulb, the decrease in the light bulb voltage is as low as 0.2%, but the detection voltage is a low value, making detection difficult. On the contrary, an 8A light bulb generates 0.8V, which is a sufficient voltage for detection,
The drop in bulb voltage is also large at 6.7%.
（ニ）問題点を解決するための手段 この発明は、電球の回路に直列に検出抵抗を挿入し、こ
の検出抵抗の両端子間にオペアンプを挿入し、検出抵抗
の両端子間の電圧の有無により電球の断芯を検出するよ
うにした回路に、さらに、この検出抵抗の両端子間にFE
Tを並設するとともに、このFETをON、OFFさせるオペア
ンプを、更に上記に並設することで、電球電流値が一定
レベル以上の場合、自動的にFETをONし、FET回路に分流
させ、検出抵抗に流れる電流を増加させることなく、従
って流出（ロス）電圧を、電球電流が増加しても、ある
範囲一定に保たせるようにする電球断芯検出方法であ
る。(D) Means for Solving Problems The present invention is to insert a detection resistor in series with a circuit of a light bulb, insert an operational amplifier between both terminals of the detection resistor, and detect the presence / absence of a voltage between both terminals of the detection resistor. In addition to the circuit that detects the disconnection of the light bulb by the FE between both terminals of this detection resistor.
By arranging T in parallel, and by additionally arranging an operational amplifier that turns this FET on and off in the above, when the bulb current value is above a certain level, the FET is automatically turned on and shunted to the FET circuit, This is a light bulb disconnection detection method that allows the outflow (loss) voltage to be kept constant in a certain range even if the light bulb current increases, without increasing the current flowing through the detection resistor.
（ホ）作用 このようにすれば、電球電流に対する検出電圧の特性
は、第２図に示すように、検出電圧がコンパレータ
（４）の基準電圧Vref1値以下の場合は、検出電圧は電
球電流の値に比例（第２図Ａ線）したものとなる。(E) Action In this way, as shown in FIG. 2, when the detection voltage is equal to or lower than the reference voltage Vref1 value of the comparator (4), the detection voltage has a characteristic of the bulb current as shown in FIG. It is proportional to the value (line A in FIG. 2).
電球電流値が大きく、検出電圧が基準電圧Vref1値を超
えるような場合は、その電圧がオペアンプ（４）にフィ
ードバークされ、FET（３）をONにするように動作し、
電球電流は、FET（３）にバイパスされて、結果的に検
出電圧＝基準電圧Vref1となるように動作する（第２図
Ｂ線）。When the bulb current value is large and the detected voltage exceeds the reference voltage Vref1 value, the voltage is fed-bark to the operational amplifier (4) and the FET ( 3 ) is turned on,
The electric bulb current is bypassed by the FET ( 3 ) and consequently operates so that the detection voltage = the reference voltage Vref1 (line B in FIG. 2).
電球電流値が更に大きく、検出抵抗とFETのON時の抵抗
との合成抵抗にVref1値以上の電圧が発生するような場
合は、検出電圧は再び電球電流に比例して上昇する（第
２図Ｃ線）。When the bulb current value is larger and a voltage higher than the Vref1 value is generated in the combined resistance of the detection resistance and the resistance when the FET is ON, the detection voltage rises again in proportion to the bulb current (Fig. 2). C line).
いま、検出抵抗（２）の抵抗値を１Ω、FET（３）のON
時に抵抗値を0.03Ω、使用電球電圧を12V、基準電圧Vre
f0.2Vとした時、 電球電流0.25Aのとき、検出（ロス）電圧0.2V、 電球電流6Aのとき、検出（ロス）電圧0.2V、 電球電流8Aのとき、検出（ロス）電圧0.23V となり、このように0.25Aから6A程度の電球では、検出
電圧は一定となるし、また、これ以上の電流でも、検出
抵抗の値はFETのON時の抵抗との合成抵抗値となるた
め、ロス電圧は低く、電球電流8A時でも0.23V（２％）
で僅かな増加にとどまる。Now, the resistance value of the detection resistor (2) is 1Ω, and the FET ( 3 ) is ON.
Sometimes resistance is 0.03Ω, bulb voltage is 12V, reference voltage Vre
At f0.2V, when the bulb current is 0.25A, the detection (loss) voltage is 0.2V, when the bulb current is 6A, the detection (loss) voltage is 0.2V, and when the bulb current is 8A, the detection (loss) voltage is 0.23V. , In this way, the detection voltage becomes constant in the light bulb of about 0.25A to 6A, and even if the current is higher than this, the value of the detection resistance is the combined resistance value with the resistance when the FET is ON, so there is no loss. The voltage is low, 0.23V (2%) even when the bulb current is 8A
Only a slight increase.
（ヘ）実施例 第１図は本発明の方法を実施した基本回路図で、電球
（１）の回路に直列に挿入された検出抵抗（２）の両端
子間にコンパレータ（４′）を並設し、さらに検出抵抗
（２）の両端子間にFET（３）を並設する。(F) Embodiment FIG. 1 is a basic circuit diagram for implementing the method of the present invention, in which a comparator (4 ') is arranged between both terminals of a detection resistor (2) inserted in series in the circuit of a light bulb (1). The FET ( 3 ) is installed in parallel between both terminals of the detection resistor (2).
FET（３）のゲートＧには、FET ON OFF用コンパレー
タ（４）を接続し、このコンパレータ（４）の非反転入
力端子は、FET（３）のドレイン側電球回路に、また、
反転入力端子には、基準電源（５）を接続する。A FET ON / OFF comparator (4) is connected to the gate G of the FET ( 3 ), and the non-inverting input terminal of the comparator (4) is connected to the drain side light bulb circuit of the FET ( 3 ).
A reference power supply (5) is connected to the inverting input terminal.
第３図は、予備電球（１′）の点灯に本発明を応用した
実施例を示すもので、広範囲の電球に無調整で対応させ
ることができる。FIG. 3 shows an embodiment in which the present invention is applied to the lighting of the spare bulb (1 '), and it is possible to deal with a wide range of bulbs without adjustment.
図３において、現用電球（１）と直列に電流検出抵抗
（２）があり、これと並列にFET1（３）が接続されてい
る。このFET1（３）のゲートＧには、オペアンプ（４）
が接続されており、オペアンプ（４）の反転入力には抵
抗（６）、ツェナーダイオード（７）、抵抗（８）およ
び抵抗（９），（10）からなる基準電源１に接続されて
いる。また、非反転入力には抵抗（２）の電圧が入力さ
れている。これにより、現用電球（１）点灯時、抵抗
（２）に電流が流れ、発生した電圧が基準電源１電圧よ
り高いと、オペアンプ（４）出力電圧が上り、FET1
（３）がONする方向に動作し、電球（１）電流をFET
（３）にバイパスするため、抵抗（２）電圧は、基準電
源１電圧と等しくなる。In FIG. 3, there is a current detecting resistor (2) in series with the working bulb (1), and a FET1 ( 3 ) is connected in parallel with the current detecting resistor (2). The operational amplifier (4) is connected to the gate G of this FET1 ( 3 ).
Is connected to the inverting input of the operational amplifier (4), which is connected to the reference power source 1 including the resistor (6), the Zener diode (7), the resistor (8), and the resistors (9) and (10). Further, the voltage of the resistor (2) is input to the non-inverting input. As a result, when the current light bulb (1) is lit, a current flows through the resistor (2), and if the generated voltage is higher than the reference power supply 1 voltage, the output voltage of the operational amplifier (4) rises and the FET1
Operates in the direction that ( 3 ) turns on, and the electric current of the electric bulb (1) is FET
By-passing to ( 3 ), the resistance (2) voltage becomes equal to the reference power supply 1 voltage.
コンパレータ（４′）は、非反転入力を抵抗（６）、ツ
ェナーダイオード（７）、抵抗（８），（９）および
（10）からなる基準電源２に接続され、反転入力に抵抗
（２）電圧が入力されている。基準電源２電圧は、通
常、基準電源１電圧の1/2に設定することで、電球
（１）が点灯し、電流が流れていると、抵抗（２）電圧
は基準電源２電圧より高くなり、オペアンプ（４′）出
力はLOレベルとなり、FET（３′）はOFFのため、予備電
球（１′）は消灯する。現用電球（１）が断芯すると、
抵抗（２）電圧はゼロとなるため、オペアンプ（４′）
出力はH1レベルとなり、FET2（３′）はONとなるため予
備電球（１′）が点灯する。The comparator (4 ') has a non-inverting input connected to a reference power supply 2 including a resistor (6), a Zener diode (7), resistors (8), (9) and (10), and an inverting input having a resistor (2). Voltage is being input. By setting the standard power supply 2 voltage to 1/2 of the standard power supply 1 voltage, the resistance (2) voltage becomes higher than the standard power supply 2 voltage when the light bulb (1) is lit and current is flowing. , The output of the operational amplifier (4 ') becomes LO level, and the FET ( 3 ') is turned off, so the spare light bulb (1 ') is turned off. When the current light bulb (1) is disconnected,
Since the resistance (2) voltage becomes zero, the operational amplifier (4 ')
The output goes to H1 level and the FET2 ( 3 ') turns on, so the spare bulb (1') lights up.
（ト）効果 このように本発明の方法によれば、電流検出電圧が一定
レベルとなることで、広範囲の負荷電流、従って、多様
な仕様の電球に対して無調整で対応させることができ
る。(G) Effect As described above, according to the method of the present invention, since the current detection voltage is at a constant level, it is possible to deal with a wide range of load currents, and thus, light bulbs of various specifications without adjustment.
また、電球が増えても電流検出部（検出抵抗）でのロス
はあまり増えないため、部品が小さくてすみ小型化でき
る。Further, even if the number of light bulbs increases, the loss in the current detection unit (detection resistance) does not increase so much, so that the parts can be small and the size can be reduced.
更に、検出電圧の値は、起寸電源電圧Vref1の値を変更
することで変えることもできるほか、検出抵抗（２）の
値により電球電流に対する検出電圧特性のＡ部傾斜を自
由に調整できる等の特徴がある。Further, the value of the detection voltage can be changed by changing the value of the sizing power supply voltage Vref1, and the inclination of the A portion of the detection voltage characteristic with respect to the bulb current can be freely adjusted by the value of the detection resistor (2). There is a feature of.
第１図は、本発明の構成を示す回路図、第２図は電球電
流に対する検出電圧の特性図、第３図は実施例、第４図
は従来の構成を示す回路図である。 （１）（１′）……電球、（２）……検出抵抗、（３）
（３′）……FET、（４）（４′）……オペアンプ、
（５）……基準電源。FIG. 1 is a circuit diagram showing a configuration of the present invention, FIG. 2 is a characteristic diagram of a detected voltage with respect to a bulb current, FIG. 3 is an embodiment, and FIG. 4 is a circuit diagram showing a conventional configuration. (1) (1 ') ... bulb, (2) ... detection resistor, (3)
(3 ') ... FET, (4) (4') ... operational amplifier,
(5) …… Reference power supply.
Claims (1)
検出抵抗の両端子間の電圧の有無により電球の断芯検出
を行うようにした電球断芯検出方法において、検出抵抗
の両端子間にFET（電界効果トランジスタ）を並設し、
更に、該FETをON、OFFするオペアンプを、上記回路に並
設し、もって、電球回路の電流値が、一定レベル以上に
なった場合、検出抵抗に対し、自動的にバイパス回路が
構成されるようにしたことを特徴とする電球断芯検出方
法。Claim: What is claimed is: 1. A detection method for inserting a detection resistor in series into a light bulb circuit, wherein the detection of a light bulb disconnection is performed according to the presence / absence of a voltage between both terminals of the detection resistor. FET (field effect transistor) is installed in parallel between
Further, an operational amplifier for turning the FET on and off is provided in parallel with the above circuit, and when the current value of the light bulb circuit exceeds a certain level, a bypass circuit is automatically formed for the detection resistor. A method for detecting a core breakage of a light bulb.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2024693A JPH07118392B2 (en) | 1990-02-02 | 1990-02-02 | Light bulb disconnection detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2024693A JPH07118392B2 (en) | 1990-02-02 | 1990-02-02 | Light bulb disconnection detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03230471A JPH03230471A (en) | 1991-10-14 |
| JPH07118392B2 true JPH07118392B2 (en) | 1995-12-18 |
Family
ID=12145252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2024693A Expired - Fee Related JPH07118392B2 (en) | 1990-02-02 | 1990-02-02 | Light bulb disconnection detection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07118392B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4657355B2 (en) * | 2009-06-30 | 2011-03-23 | パナソニック株式会社 | Light emitting element driving device and light emitting device |
| JP4746150B2 (en) * | 2010-10-26 | 2011-08-10 | パナソニック株式会社 | Light emitting element driving device and light emitting device |
-
1990
- 1990-02-02 JP JP2024693A patent/JPH07118392B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03230471A (en) | 1991-10-14 |
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