JPS58433A - Lamp breakage detection circuit for automobiles - Google Patents
Lamp breakage detection circuit for automobilesInfo
- Publication number
- JPS58433A JPS58433A JP9741581A JP9741581A JPS58433A JP S58433 A JPS58433 A JP S58433A JP 9741581 A JP9741581 A JP 9741581A JP 9741581 A JP9741581 A JP 9741581A JP S58433 A JPS58433 A JP S58433A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- lamp
- power supply
- always
- detection resistor
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims description 14
- 239000000470 constituent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q11/00—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00
- B60Q11/005—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00 for lighting devices, e.g. indicating if lamps are burning or not
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明はｉｉＩ＃車用のランプ断線検出回路に関し、構
成素子の削減を計ったものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lamp burnout detection circuit for iii# vehicles, and is designed to reduce the number of components.
自動車はヘッドランプをはじめ各種のランプ負荷を備え
ている。これらの各種ランプ負荷が正常に点灯するか否
かは自動車の安食道行にとって重要なこととなる。そζ
で従来よｊ４ｉｒ種の自動車用ＯｙンプＷＩｒｌＩ検出
回路が提案畜れている。ところが従来技術におけるこの
種ｏｙンプ断纏検出回路は何れもパワースイッチがラン
プの数だけ必ｌ！になゐζ２をはじめとして構成素子に
非常に厳しい性能を要求されるという欠点を有している
０本発明は、上記従来技術の欠点に鑑み、構成重子Ｏ削
減を計）得為自動車用０９７グ断−検出−路を提供する
ことを目的とする・かかる目的を達成する本発明は互い
に並列ＫＪＩ続され九複数鯛のランプをＩＩＩのパワー
スイッチで駆動するとともに、ランプが皆正常である場
合とそうでない場合とでは負荷電流の値が異なる点に鑑
み前記負荷電流を基準値と比較してその大小関係によ１
ラングの断線を検出するようにしえものである。九にζ
ｏｔａｏ電気−路Ｋｊｈいて、ランプ駆動用の電源電圧
は装動し同時に９ンプは非直線性の負荷でＴｏＩ電源電
圧の変動と負荷電ＲＯ変動とは１対１０関係では比例し
ないので基準値の与え方を工夫して中る必９がある。そ
こで本発明は基準値を電源電圧の変動に追随せしめると
同時に固定電圧で補償するようＫし友ものである。Automobiles are equipped with various lamp loads including headlamps. Whether or not these various lamp loads are lit normally is important for the safe operation of a car. Soζ
So far, a j4ir type automotive Oymp WIrlI detection circuit has been proposed. However, this kind of oil lamp disconnection detection circuit in the prior art requires as many power switches as there are lamps! In view of the drawbacks of the above-mentioned prior art, the present invention aims to reduce the number of constituent elements (097) for automobiles. The present invention achieves this purpose by driving nine or more lamps connected in parallel to each other with a power switch III, and when all the lamps are normal. In view of the fact that the value of the load current is different between cases where this is not the case, the load current is compared with the reference value and the magnitude relationship
It is designed to detect rung breakage. Nine to ζ
otao electric line Kjh, the power supply voltage for driving the lamp is activated, and at the same time the 9 lamp is a non-linear load, and the fluctuation of the ToI power supply voltage and the fluctuation of the load current RO are not proportional in a 1:10 relationship, so the reference value is There is a chance that you will get a score of 9 by devising the way you give it. Therefore, the present invention allows the reference value to follow fluctuations in the power supply voltage while at the same time compensating with a fixed voltage.
以下、本発明の実施例を図面に基づき詳頴に説明する０
図に示すように、本実施例においては並列に１１続され
九４１ｍｍのランプ１，２，３．４をトランジスタであ
るＩｌｍのパワースイッチＳで駆動するように＆りてい
る。このときの電源電圧はｖＣＣ％負荷電流はＩｏとし
て夫々図中に示す・このうち負荷電流Ｉ０の大きさは負
荷電流検出用抵抗Ｒ０の両端の電圧ｖｇｏとして検出さ
れ電圧比較器・て基準値 ｖｒ、ｆと比較される。この
とき４灯共に正常な場合にはｖｉＬｏ ＞ｖｒｅｆ １
オ九ｌ灯以上が断線している場合ＫＦｉＶ、。＜ｖｒ、
、なる関係が成立するようになっておｐ％ｖ８゜＜”ｒ
ｄ の場合にはゲート回路１を介してランプ断線信号８
゜が出力される。基準値ｖｒ＊ｆの値は抵抗Ｒ，、Ｒ２
，Ｒ。Hereinafter, embodiments of the present invention will be explained in detail based on the drawings.
As shown in the figure, in this embodiment, 11 lamps 1, 2, 3.4 of 941 mm in length are connected in parallel and are driven by a power switch S of Ilm, which is a transistor. The power supply voltage at this time is vCC%, and the load current is shown in the figure as Io.The magnitude of the load current I0 is detected as the voltage vgo across the load current detection resistor R0, and the voltage comparator is used to calculate the reference value vr. , f. At this time, if all four lights are normal, viLo > vref 1
KFiV, if more than nine lights are disconnected. <vr,
, the relationship becomes established, and p%v8゜<”r
In the case of d, the lamp burnout signal 8 is sent via the gate circuit 1.
゜ is output. The value of the reference value vr*f is the resistance R,, R2
,R.
とダイオード０１により発生する電圧である・このうち
抵抗Ｒ２の一端には電源電圧ｖｃＣが、壇九抵抗町の一
端には固定電圧ｖＤＤが夫々印加されている・このとき
電源電圧Ｖ。Ｃは他の負荷との関係”ｔ’５ｖ−１ｓｖ
＠＊ｏｓｖｔｔを変動する。そこで抵抗町を介して電源
電圧ｖ′ｃｃを印加することにＪ ＩＩ ！！１１１１
４１１ ｖｒｄをこの変動に対応せしめている。is the voltage generated by the diode 01.The power supply voltage vcC is applied to one end of the resistor R2, and the fixed voltage vDD is applied to one end of the resistor R2.At this time, the power supply voltage V. C is the relationship with other loads "t'5v-1sv
@*osvtt is varied. Therefore, it is necessary to apply the power supply voltage v'cc through the resistor. ! 1111
411 vrd is made to correspond to this variation.
その他に固定電圧ｖＤＤを設は九のは次の理由による・
即ち、ランプ１〜４の負荷としての非直着性に起因して
負荷電流！。と電源電圧ｖｃｃとａｌ対ｌの関係ては比
例せずほぼｘ０＋ΔＩ、／Ｉ、−１１ｅ（ｖｃｃｏ、５
５
＋”ＣＣ／’ＣＣ） となる、そこでこの非直線性
を固定電圧ｖＤＤ （例えば５Ｖ）で補正しているので
ある。このｍ＊＊準値ｖｒｄは４灯点灯時の電圧ｖ８゜
より常に大暑＜、＊九１灯断着時の電圧ｖ８゜よｐ常に
小書（なるよう、になっている、これは抵抗翼。、Ｒ□
、町、町の値を適宜選択することによ會達成し得る。こ
のと自電源電圧ｖｃｃが８ｖ〜ｌ・Ｖの範囲だと負荷電
流！。は直線近似で自ルｅ １ ＊電ｉｖ］ｌ、 ｄ
２００ ｍＶ＠ｆとすゐことによ）抵抗翼。ｋおける電
圧降下を無視し得るようにしておく。ラング制御−路８
によるパワースイッチ５の閉成時、即ち、ランプ１〜４
０滅灯時には同時に前記ランプ制御−路畠でゲート回路
１を制御して２ンプ断線信号１゜が出力されないように
してｓＰ（。ラング滅灯Ｗ＃にはランプ１〜４が皆正常
であっても常ＫＶ、。＜ｖｒ、ｆ となるからである
・因に通常２ンプ断−となるのはこれがオフ状態からオ
ン状ＭＩＫなる時のラッシュカレン）ｉＬ（Ｆｉ点灯し
てフィラメントが高温となっている時の震動に起因する
のでランプ点灯時のみの断線検出で問題はない。In addition, the reason for setting fixed voltage vDD is as follows:
That is, due to the non-direct connection of the lamps 1 to 4 as loads, the load current! . The relationship between power supply voltage vcc and al vs. l is not proportional and is approximately x0 + ΔI, /I, -11e (vcco, 5
5 +"CC/'CC), so this nonlinearity is corrected with a fixed voltage vDD (for example, 5V). This m** quasi-value vrd is always lower than the voltage v8° when four lamps are lit. Great heat<, * Voltage when 91 lights are disconnected v8゜p It's always a small book (It's like this, this is a resistance blade., R□
This can be achieved by selecting the values of , town, and town appropriately. In this case, if the own power supply voltage VCC is in the range of 8V to 1.V, the load current! . is a straight line approximation, e 1 * electric iv] l, d
200 mV@f) resistance wing. The voltage drop at k can be ignored. rung control - road 8
When the power switch 5 is closed by
When the 0 lamp goes out, the gate circuit 1 is controlled at the same time by the lamp control circuit 1 so that the 2 lamp disconnection signal 1° is not output. This is because KV, .<vr, f normally occurs.Incidentally, the reason why 2 pumps are normally disconnected is because of the rush current when MIK changes from the OFF state to the ON state. Since this is caused by vibration when the lamp is on, there is no problem in detecting the disconnection only when the lamp is on.
以上実施例とと４ＫＡ体的に説明し丸ように、本発明に
よればｌ−のパワースイッチで複数個のランプを駆動す
るようにし、しかもランプに流れる負荷電流の値を電流
検出用抵抗の両端の電圧として取ｐ出し、電源電圧の変
動及びラングの負荷としての非直線性にもかかわらずラ
ンプが皆正常である場合＃ｉ前記電流検出用抵抗の両端
の電圧より常に小さく、またランプが１−でも断線した
場合ＫＦｉ前記電圧より常に大暑くなるよう電源電圧と
固定電圧とから作られる基準電圧と比較するようにした
ので、極めて小数の構成素子で所望の断線検出を行なう
ことができる・As described above in detail with the embodiments and 4KA, according to the present invention, a plurality of lamps are driven by an l-power switch, and the value of the load current flowing through the lamps is determined by a current detection resistor. If the lamps are all normal despite fluctuations in the power supply voltage and non-linearity as a load on the rung, the voltage across the current detection resistor is always smaller than the voltage across the current detection resistor, and the lamp is Since the KFi is compared with a reference voltage created from the power supply voltage and a fixed voltage so that if a wire breaks even in the case of a wire breakage, it will always be much hotter than the above voltage, it is possible to perform the desired wire breakage detection with an extremely small number of components.
図は本発明の実Ｊ１例を示す回路図である。 図面中、 １．２．３．４はランプ、 Ｓはパワースイッチ、 ｖｃｃは電源電圧、 ｖＤＤは固定電圧、 −０は電流検出用抵抗の両端の電圧、 ’ｒｄは基準電圧、 ！。は負荷電流、 Ｒｏは電流検出用抵抗、 ８゜はランプ断線信号である。 特許出願人 住友電気工業株式金社 The figure is a circuit diagram showing an actual example J1 of the present invention. In the drawing, 1.2.3.4 is a lamp, S is power switch, vcc is the power supply voltage, vDD is a fixed voltage, -0 is the voltage across the current detection resistor, ’rd is the reference voltage, ! . is the load current, Ro is a current detection resistor, 8° is a lamp breakage signal. Patent applicant: Sumitomo Electric Industries, Ltd.
Claims (1)
介して駆動せしめられる互いに並列Ｋｍ絖された複数制
のりンプと、このランプに流れる負荷電流を検出する電
流検出用抵抗とを有し、前記ランプが皆正常であゐ場合
は前記電流検出用抵抗の両端の電圧よ少常に小さく、ラ
ンプがＩＩＩでも断−し九場合には前記電圧よ）常に大
自（なるよう前記電源電圧とこれを補償する同定電圧と
ｔ為ら作られる基準電圧と前記電流検出用抵抗の両端の
電圧とを比較してツｙプ点灯時で前記電圧が前記基準電
圧よや小さくなりたとｔ１クンプ断断信号を出力するよ
うにしたことｔｅ黴とする自動車用のランプ断−検出鴎
路・The lamp includes a plurality of lamps connected in parallel with each other, which are driven via a IIIK power switch by the varying power supply voltage of the automobile, and a current detection resistor for detecting the load current flowing through the lamp. If everything is normal, the voltage across the current detection resistor is always a little lower, and if the lamp is cut off even at 9, the voltage is always the same as above (compensate this with the power supply voltage so that it is always the same). A reference voltage created from the identification voltage and t is compared with the voltage across the current detection resistor, and a t1 cutoff signal is output when the voltage becomes slightly smaller than the reference voltage when the yp is turned on. What we did was to detect mold in automobile lamps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9741581A JPS58433A (en) | 1981-06-25 | 1981-06-25 | Lamp breakage detection circuit for automobiles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9741581A JPS58433A (en) | 1981-06-25 | 1981-06-25 | Lamp breakage detection circuit for automobiles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58433A true JPS58433A (en) | 1983-01-05 |
Family
ID=14191837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9741581A Pending JPS58433A (en) | 1981-06-25 | 1981-06-25 | Lamp breakage detection circuit for automobiles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58433A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2548413A1 (en) * | 1983-07-01 | 1985-01-04 | Ricard Claude | Methods and devices for avoiding fraud in a taxi equipped with a light repeater |
| JPH03235733A (en) * | 1990-02-09 | 1991-10-21 | Mitsuba Electric Mfg Co Ltd | Headlight circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4911095A (en) * | 1972-05-26 | 1974-01-31 | ||
| JPS5213797A (en) * | 1975-07-22 | 1977-02-02 | Jidosha Denki Kogyo Co Ltd | Burn-out alarm unit for electric lamp used for automobile |
-
1981
- 1981-06-25 JP JP9741581A patent/JPS58433A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4911095A (en) * | 1972-05-26 | 1974-01-31 | ||
| JPS5213797A (en) * | 1975-07-22 | 1977-02-02 | Jidosha Denki Kogyo Co Ltd | Burn-out alarm unit for electric lamp used for automobile |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2548413A1 (en) * | 1983-07-01 | 1985-01-04 | Ricard Claude | Methods and devices for avoiding fraud in a taxi equipped with a light repeater |
| JPH03235733A (en) * | 1990-02-09 | 1991-10-21 | Mitsuba Electric Mfg Co Ltd | Headlight circuit |
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