JP2002270384A - Protecting circuit of current driving element for lighting fixture - Google Patents
Protecting circuit of current driving element for lighting fixtureInfo
- Publication number
- JP2002270384A JP2002270384A JP2001066698A JP2001066698A JP2002270384A JP 2002270384 A JP2002270384 A JP 2002270384A JP 2001066698 A JP2001066698 A JP 2001066698A JP 2001066698 A JP2001066698 A JP 2001066698A JP 2002270384 A JP2002270384 A JP 2002270384A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- current
- lamp
- current drive
- parallel
- 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.)
- Abandoned
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/20—Responsive to malfunctions or to light source life; for protection
- H05B47/24—Circuit arrangements for protecting against overvoltage
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B45/54—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a series array of LEDs
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、灯具用電流駆動素
子の保護回路の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a protection circuit for a current driver for a lamp.
【０００２】[0002]
【従来の技術】従来から、図４に示す灯具用電流駆動素
子の保護回路が知られている。この図４において、１は
定電流駆動回路、２は灯具用電流駆動素子の並列回路で
ある。この灯具用電流駆動素子の並列回路２は図５に示
すように複数個のＬＥＤ（発光ダイオード）３を直列に
配列した直列回路４を複数個並列に接続することによっ
て構成されている。2. Description of the Related Art Conventionally, a protection circuit for a current drive element for a lamp shown in FIG. 4 is known. In FIG. 4, reference numeral 1 denotes a constant current drive circuit, and 2 denotes a parallel circuit of lamp current drive elements. As shown in FIG. 5, the parallel circuit 2 of the lamp current drive element is configured by connecting a plurality of series circuits 4 in which a plurality of LEDs (light emitting diodes) 3 are arranged in series.
【０００３】この灯具用電流駆動素子の保護回路は、電
圧比較器５を有する。この電圧比較器５の一端子＋には
出力電圧Ｖｏｕｔが印加され、電圧比較器５の他端子に
は予め定めた上限基準電圧Ｖｎｏｒｍが印加されてい
る。[0003] The protection circuit for the current drive element for a lamp has a voltage comparator 5. The output voltage Vout is applied to one terminal + of the voltage comparator 5, and a predetermined upper limit reference voltage Vnorm is applied to the other terminal of the voltage comparator 5.
【０００４】定電流駆動回路１には、電源に通じる車体
側接続線Ｈから信号が入力され、定電流駆動回路１は、
灯具用電流駆動素子の並列回路２に向かって定電流Ｉを
流し続け、これによって、各ＬＥＤ３が所定の明るさで
点灯される。A signal is input to the constant current drive circuit 1 from a vehicle body side connection line H leading to a power source.
The constant current I continues to flow toward the parallel circuit 2 of the lamp current drive elements, whereby each LED 3 is lit with a predetermined brightness.
【０００５】[0005]
【発明が解決しようとする課題】ところで、この従来の
灯具用電流駆動素子の保護回路では、少なくともＬＥＤ
３の１つが故障して断線状態になると、そのＬＥＤ３の
属する直列回路４には電流が流れないことになるが、定
電流駆動回路１は電流Ｉが一定となるように灯具用電流
駆動素子の並列回路２に向かって電流Ｉを流し続けるた
め、未故障のＬＥＤ３に流れる電流が増加し、これによ
って、未故障のＬＥＤ３に過電圧Ｖ’ｏｕｔが加わるこ
とになり、その未故障のＬＥＤ３が少なくとも１個のＬ
ＥＤ３が故障したことによって寿命や特性にその影響を
受けて故障するおそれがある。By the way, in this conventional protection circuit for a current driving element for a lamp, at least an LED is used.
When one of the LEDs 3 breaks down and becomes disconnected, no current flows through the series circuit 4 to which the LED 3 belongs. However, the constant current drive circuit 1 controls the current drive element for the lamp so that the current I is constant. Since the current I continues to flow toward the parallel circuit 2, the current flowing through the non-failed LED 3 increases, which causes an overvoltage V'out to be applied to the non-failed LED 3, and the non-failed LED 3 becomes at least one. L
When the ED 3 fails, the ED 3 may be affected by its life or characteristics and may fail.
【０００６】電圧比較器５は、そのＬＥＤ３の少なくと
も１つが故障して断線状態になることに基づく出力電圧
Ｖｏｕｔを上限基準電圧Ｖｎｏｒｍと比較し、図６に示
す点Ｑで示すように出力電圧Ｖｏｕｔが上限基準電圧Ｖ
ｎｏｒｍを越えたときに、定電流駆動回路１の作動を停
止し、未故障の各ＬＥＤ３に流れる電流を停止し、灯具
全体を消灯状態としてその未故障の各ＬＥＤを保護する
役割を果たしている。The voltage comparator 5 compares the output voltage Vout based on the failure of at least one of the LEDs 3 and the disconnection state with the upper limit reference voltage Vnorm, and as shown by the point Q in FIG. 6, the output voltage Vout Is the upper limit reference voltage V
When the value exceeds norm, the operation of the constant current drive circuit 1 is stopped, the current flowing through each unfailed LED 3 is stopped, and the entire lamp is turned off to protect each unfailed LED.
【０００７】その図６では、定電流駆動回路１の作動が
停止するまでに時間遅れがあるために、未故障のＬＥＤ
３は若干過電圧Ｖ’ｏｕｔとなっている状態が示されて
いる。In FIG. 6, since there is a time delay before the operation of the constant current driving circuit 1 stops, an unfailed LED
Reference numeral 3 indicates a state where the overvoltage is slightly V'out.
【０００８】なお、この従来の灯具用電流駆動素子の保
護回路では、電圧比較器５は、少なくとも一部のＬＥＤ
３が短絡してその抵抗値が減少することに基づき出力電
圧Ｖｏｕｔが低下したときにも、予め定めた下限基準電
圧と比較して、定電流駆動回路１の作動を停止させる構
成とされている。In this conventional protection circuit for a lamp current drive element, the voltage comparator 5 includes at least a part of the LED.
Even when the output voltage Vout decreases based on a short-circuit of the resistor 3 and a decrease in its resistance value, the operation of the constant current drive circuit 1 is stopped by comparing the output voltage Vout with a predetermined lower-limit reference voltage. .
【０００９】しかしながら、この従来の灯具用電流駆動
素子の保護回路は、一部のＬＥＤ３が故障すると、灯具
全体の機能を停止させるものであるから、未故障のＬＥ
Ｄ３の保護を図ることができるという長所はあるもの
の、故障の際に灯具全体の機能を維持できないという不
都合がある。特に、車両用灯具として用いる場合に不都
合がある。However, this conventional protection circuit for a current drive element for a lamp stops the function of the entire lamp when a part of the LED 3 fails, so that an unfailed LE
Although there is an advantage that D3 can be protected, there is a disadvantage that the function of the entire lamp cannot be maintained in the event of a failure. In particular, it is inconvenient when used as a vehicle lamp.
【００１０】本発明は、上記の事情に鑑みて為されたも
ので、未故障の灯具用電流駆動素子の故障のおそれを極
力回避しつつ灯具全体の機能の維持を図ることができ、
ひいては信頼性の向上を図ることのできる灯具用電流駆
動素子の保護回路を提供することにある。[0010] The present invention has been made in view of the above circumstances, and it is possible to maintain the functions of the entire lamp while minimizing the possibility of failure of an unfailed lamp current drive element.
It is another object of the present invention to provide a protection circuit for a current driving element for a lamp, which can improve reliability.
【００１１】[0011]
【課題を解決するための手段】請求項１に記載の灯具用
電流駆動素子の保護回路は、電流に基づき点灯される灯
具用電流駆動素子が並列に接続された並列回路と、前記
複数個の灯具用電流駆動素子に向かって定電流を供給す
る定電流駆動回路と、前記並列回路に並列に接続される
分流回路と、前記灯具用電流駆動素子の故障を出力電圧
の変化として検出しかつ該出力電圧が上限基準電圧を越
えたときに前記分流回路を通じて電流を流すための電圧
比較器とを有することを特徴とする。According to a first aspect of the present invention, there is provided a protection circuit for a current driving element for a lamp, comprising: a parallel circuit in which a current driving element for a lamp that is turned on based on a current is connected in parallel; A constant current drive circuit for supplying a constant current toward the lamp current drive element, a shunt circuit connected in parallel to the parallel circuit, and detecting a failure of the lamp current drive element as a change in output voltage; A voltage comparator for flowing a current through the shunt circuit when the output voltage exceeds the upper limit reference voltage.
【００１２】請求項１に記載の発明によれば、並列回路
の灯具用電流駆動素子の一部に断線等の開放故障が発生
すると、電圧比較器が出力電圧の上昇を検出し、出力電
圧が上限基準電圧を超えると、分流回路が未故障の灯具
用電流駆動素子に流れる電流の一部を迂回して流すこと
になり、未故障の灯具用電流駆動素子に過電圧が加わる
のを防止でき、従って、請求項１に記載の発明によれ
ば、未故障の灯具用電流駆動素子の故障のおそれを極力
回避しつつ灯具全体の機能の維持を図ることができる。According to the first aspect of the present invention, when an open failure such as a disconnection occurs in a part of the lamp current drive element of the parallel circuit, the voltage comparator detects an increase in the output voltage, and the output voltage is reduced. When the voltage exceeds the upper limit reference voltage, the shunt circuit bypasses a part of the current flowing to the unfailed lamp current drive element, thereby preventing an overvoltage from being applied to the unfailed lamp current drive element, Therefore, according to the first aspect of the present invention, it is possible to maintain the function of the entire lamp while minimizing the possibility of failure of the non-failed lamp current drive element.
【００１３】[0013]
【発明の実施の形態】図１において、１０は定電流駆動
回路、１１は灯具用電流駆動素子の並列回路である。こ
の灯具用電流駆動素子の並列回路１１は図２に示すよう
に複数個のＬＥＤ１２を直列に配列した直列回路１３を
複数個並列に接続することによって構成されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 10 denotes a constant current drive circuit, and reference numeral 11 denotes a parallel circuit of lamp current drive elements. As shown in FIG. 2, the parallel circuit 11 of the lamp current drive element is configured by connecting a plurality of series circuits 13 in each of which a plurality of LEDs 12 are arranged in series.
【００１４】その定電流駆動回路１０と灯具用電流駆動
素子回路１１とは結線路１４によって接続されている。
灯具用電流駆動素子の並列回路１１の結線路１４に接続
される側を高電位側、灯具用電流駆動素子の並列回路１
１のアースされる側を低電位側という。The constant current drive circuit 10 and the lamp current drive element circuit 11 are connected by a connection line 14.
The side connected to the connection line 14 of the parallel circuit 11 of the lamp current drive element is on the high potential side, and the parallel circuit 1 of the lamp current drive element 1
1 is referred to as a low potential side.
【００１５】定電流駆動回路１０には、車体側接続線Ｈ
から信号が入力され、定電流駆動回路１０は一定の出力
電流Ｉｏｕｔを出力する役割を果たす。定電流駆動回路
１０と灯具用電流駆動素子回路１１との間には、電圧比
較器１５が設けられている。The constant current drive circuit 10 includes a vehicle-side connection line H
, And the constant current drive circuit 10 plays a role of outputting a constant output current Iout. A voltage comparator 15 is provided between the constant current drive circuit 10 and the lamp current drive element circuit 11.
【００１６】この電圧比較器１５は、図２に示すよう
に、比較器１６、１７とオア回路１８と、分圧抵抗Ｒ
１、Ｒ２、Ｒ３の直列抵抗体とから構成されている。分
圧抵抗Ｒ１の低電位側はアースされ、分圧抵抗Ｒ３の高
電位側には安定電圧Ｖが印加されている。As shown in FIG. 2, the voltage comparator 15 includes comparators 16 and 17, an OR circuit 18, and a voltage dividing resistor R.
1, R2 and R3 in series. The low potential side of the voltage dividing resistor R1 is grounded, and the stable voltage V is applied to the high potential side of the voltage dividing resistor R3.
【００１７】比較器１６の＋端子、比較器１７の−端子
は結線路１４に接続されて、比較器１６の＋端子、比較
器１７の−端子には出力電圧Ｖｏｕｔが印加されてい
る。比較器１６の−端子は抵抗Ｒ３と抵抗Ｒ２の接続点
に接続されて、比較器１６の−端子には上限基準電圧Ｖ
ｎｏｒｍ１が印加されている。比較器１７の＋端子は抵
抗Ｒ１と抵抗Ｒ２の接続点に接続されて、比較器１７の
＋端子には下限基準電圧Ｖｎｏｒｍ２が印加されてい
る。比較器１６は出力電圧Ｖｏｕｔが上限基準電圧Ｖｎ
ｏｒｍ１を越えたときに「Ｈ」となり、それ以下のとき
は「Ｌ」となる。比較器１７は出力電圧Ｖｏｕｔが下限
基準電圧Ｖｎｏｒｍ２を下回ったときに「Ｈ」となり、
それ以上のときは「Ｌ」となる。The + terminal of the comparator 16 and the-terminal of the comparator 17 are connected to the connection line 14, and the output voltage Vout is applied to the + terminal of the comparator 16 and the-terminal of the comparator 17. The negative terminal of the comparator 16 is connected to the connection point between the resistors R3 and R2, and the negative terminal of the comparator 16 is connected to the upper limit reference voltage V.
norm1 is applied. The + terminal of the comparator 17 is connected to the connection point of the resistors R1 and R2, and the lower terminal of the comparator 17 is applied with the lower-limit reference voltage Vnorm2. The comparator 16 determines that the output voltage Vout is equal to the upper limit reference voltage Vn.
It becomes "H" when it exceeds orm1, and it becomes "L" when it is less than orm1. The comparator 17 becomes “H” when the output voltage Vout falls below the lower limit reference voltage Vnorm2,
If it is longer than this, it becomes "L".
【００１８】比較器１６、１７の出力はオア回路１８を
介して分流回路１９に入力されている。分流回路１９は
スイッチングトランジスタＴｒと抵抗Ｒ４とから構成さ
れている。抵抗Ｒ４の一端は結線路１４に接続され、そ
の他端はスイッチングトランジスタＴｒのコレクタＣに
接続されている。スイッチングトランジスタＴｒのベー
スＢにはオア回路１８の出力が入力され、スイッチング
トランジスタＴｒのエミッタＥはアースされている。The outputs of the comparators 16 and 17 are input to a shunt circuit 19 via an OR circuit 18. The shunt circuit 19 includes a switching transistor Tr and a resistor R4. One end of the resistor R4 is connected to the connection line 14, and the other end is connected to the collector C of the switching transistor Tr. The output of the OR circuit 18 is input to the base B of the switching transistor Tr, and the emitter E of the switching transistor Tr is grounded.
【００１９】この灯具用電流駆動素子の保護回路におい
て、各ＬＥＤ１２に故障のないときには、比較器１６、
１７の出力は共に「Ｌ」であり、スイッチングトランジ
スタＴｒはオフのままであるので、高電位側から低電位
側に向かって出力電流Ｉｏｕｔが流れ、各ＬＥＤ１２は
正常点灯状態を保つ。In the protection circuit for the current drive element for a lamp, when there is no failure in each LED 12, the comparator 16,
17 are both "L" and the switching transistor Tr remains off, so that the output current Iout flows from the high potential side to the low potential side, and each LED 12 maintains the normal lighting state.
【００２０】ここで、ＬＥＤ１２の少なくとも１個以上
が断線すると、出力電流Ｉｏｕｔが一定に保たれている
ので、未故障の各ＬＥＤ１２に流れる電流が増大する。
従って、図３に示すように出力電圧Ｖｏｕｔが上昇し
て、未故障の各ＬＥＤ１２に加わる電圧が過電圧Ｖ’ｏ
ｕｔとなる。Here, when at least one of the LEDs 12 is disconnected, the output current Iout is kept constant, so that the current flowing through each non-failed LED 12 increases.
Therefore, as shown in FIG. 3, the output voltage Vout rises, and the voltage applied to each non-failed LED 12 becomes the overvoltage V'o.
ut.
【００２１】ここで、出力電圧Ｖｏｕｔが点Ｑ’で示す
ように上限基準電圧Ｖｎｏｒｍ１を越えると、電圧比較
器１６が「Ｌ」から「Ｈ」となり、従って、スイッチン
グトランジスタＴｒがオフからオンとなり、そのコレク
タＣ−エミッタＥ間が短絡され、結線路１４からアース
に向かって電流Ｉｏが抵抗Ｒ４を介して流れることにな
る。Here, when the output voltage Vout exceeds the upper limit reference voltage Vnorm1 as shown by the point Q ', the voltage comparator 16 changes from "L" to "H", and the switching transistor Tr turns from off to on. The collector C and the emitter E are short-circuited, and the current Io flows from the connection line 14 to the ground via the resistor R4.
【００２２】よって、未故障の各ＬＥＤ１２に流れる電
流が故障発生時点で流れる電流よりも減少し、これによ
って、各ＬＥＤ１２は過電圧Ｖ’ｏｕｔが加わる過電圧
状態を解消され、その未故障の各ＬＥＤ１２の故障を回
避しつつ点灯状態を維持できることになる。Therefore, the current flowing through each non-failed LED 12 is smaller than the current flowing at the time of occurrence of the failure, whereby each LED 12 is released from the overvoltage state in which the overvoltage V'out is applied, and The lighting state can be maintained while avoiding a failure.
【００２３】この際、出力電圧Ｖｏｕｔは故障時の並列
回路１１の抵抗と抵抗Ｒ４とによって決定される電圧に
安定するが、その出力電圧Ｖｏｕｔは実際的にはＶｎｏ
ｒｍ近傍である。At this time, the output voltage Vout is stabilized at a voltage determined by the resistance of the parallel circuit 11 at the time of failure and the resistance R4, but the output voltage Vout is actually Vno.
rm.
【００２４】一方、ＬＥＤ１２の少なくとも１個以上が
短絡すると、灯具用電流駆動素子回路１１の全体の抵抗
が減少するので、出力電圧Ｖｏｕｔが下限基準電圧Ｖｎ
ｏｒｍ２を下回ると、電圧比較器１７が「Ｌ」から
「Ｈ」となり、従って、スイッチングトランジスタＴｒ
がオフからオンとなり、そのコレクタＣ−エミッタＥ間
が短絡され、結線路１４からアースに向かって電流Ｉｏ
が抵抗Ｒ４を介して流れることになる。On the other hand, when at least one or more of the LEDs 12 is short-circuited, the overall resistance of the lamp current drive element circuit 11 decreases, so that the output voltage Vout decreases to the lower limit reference voltage Vn.
orm2, the voltage of the voltage comparator 17 changes from “L” to “H”.
Turns on from off, the collector C and the emitter E are short-circuited, and the current Io flows from the connection line 14 to the ground.
Flows through the resistor R4.
【００２５】よって、いずれかのＬＥＤ１２が短絡した
場合でも、未故障の各ＬＥＤ１２の故障を回避しつつ点
灯状態を維持できることになる。Therefore, even if any one of the LEDs 12 is short-circuited, the lighting state can be maintained while avoiding the failure of each of the unfailed LEDs 12.
【００２６】[0026]
【発明の効果】本発明によれば、未故障の灯具用電流駆
動素子の故障のおそれを極力回避しつつ灯具全体の機能
の維持を図り、ひいては灯具の信頼性の向上を図ること
ができる。According to the present invention, it is possible to maintain the function of the entire lamp while minimizing the possibility of failure of an unfailed current drive element for a lamp, and to improve the reliability of the lamp.
【図１】 本発明の灯具用電流駆動素子の保護回路のブ
ロック図である。FIG. 1 is a block diagram of a protection circuit for a current drive element for a lamp according to the present invention.
【図２】 図１に示す灯具用電流駆動素子の保護回路の
詳細図である。FIG. 2 is a detailed diagram of a protection circuit of the lamp current driver shown in FIG.
【図３】 図１に示す灯具用電流駆動素子の保護回路の
作用を説明するためのタイムチャートである。FIG. 3 is a time chart for explaining the operation of the protection circuit of the current driving element for a lamp shown in FIG. 1;
【図４】 従来の灯具用電流駆動素子の保護回路のブロ
ック図である。FIG. 4 is a block diagram of a conventional protection circuit for a lamp current drive element.
【図５】 図４に示す灯具用電流駆動素子の並列回路の
詳細構成図である。5 is a detailed configuration diagram of a parallel circuit of the lamp current driver shown in FIG. 4;
【図６】 図１に示す灯具用電流駆動素子の保護回路の
作用を説明するためのタイムチャートである。FIG. 6 is a time chart for explaining the operation of the protection circuit of the lamp current driver shown in FIG. 1;
１２…ＬＥＤ（灯具用電流駆動素子） １０…定電流駆動回路 １５…電圧比較器 １９…分流回路 Ｉｏｕｔ…定電流 Ｖｏｕｔ…出力電圧 Ｖｎｏｒｍ１…上限基準電圧 12 LED (current drive element for lamp) 10 constant current drive circuit 15 voltage comparator 19 shunt circuit Iout constant current Vout output voltage Vnorm 1 upper limit reference voltage
Claims (1)
素子が並列に接続された並列回路と、前記複数個の灯具
用電流駆動素子に向かって定電流を供給する定電流駆動
回路と、前記並列回路に並列に接続される分流回路と、
前記灯具用電流駆動素子の故障を出力電圧の変化として
検出しかつ該出力電圧が上限基準電圧を越えたときに前
記分流回路を通じて電流を流すための電圧比較器とを有
することを特徴とする灯具用電流駆動素子の保護回路。1. A parallel circuit in which lamp current drive elements that are turned on based on current are connected in parallel; a constant current drive circuit that supplies a constant current to the plurality of lamp current drive elements; A shunt circuit connected in parallel to the parallel circuit;
A lamp comparator for detecting a failure of the lamp current drive element as a change in output voltage and for flowing a current through the shunt circuit when the output voltage exceeds an upper limit reference voltage; Protection circuit for the current drive element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001066698A JP2002270384A (en) | 2001-03-09 | 2001-03-09 | Protecting circuit of current driving element for lighting fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001066698A JP2002270384A (en) | 2001-03-09 | 2001-03-09 | Protecting circuit of current driving element for lighting fixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002270384A true JP2002270384A (en) | 2002-09-20 |
Family
ID=18925158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001066698A Abandoned JP2002270384A (en) | 2001-03-09 | 2001-03-09 | Protecting circuit of current driving element for lighting fixture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002270384A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006034544A (en) * | 2004-07-26 | 2006-02-09 | Olympus Corp | Electronic endoscope system |
| WO2006019897A2 (en) * | 2004-08-04 | 2006-02-23 | Ng James K | Led lighting system |
| JP2014135167A (en) * | 2013-01-09 | 2014-07-24 | Sanken Electric Co Ltd | Led power supply device |
| WO2019000924A1 (en) * | 2017-06-27 | 2019-01-03 | 深圳创维－Rgb电子有限公司 | Led light bar network current foldback circuit, driving power supply and tv set |
-
2001
- 2001-03-09 JP JP2001066698A patent/JP2002270384A/en not_active Abandoned
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006034544A (en) * | 2004-07-26 | 2006-02-09 | Olympus Corp | Electronic endoscope system |
| JP4689206B2 (en) * | 2004-07-26 | 2011-05-25 | オリンパス株式会社 | Electronic endoscope system |
| WO2006019897A2 (en) * | 2004-08-04 | 2006-02-23 | Ng James K | Led lighting system |
| WO2006019897A3 (en) * | 2004-08-04 | 2006-05-18 | James K Ng | Led lighting system |
| JP2014135167A (en) * | 2013-01-09 | 2014-07-24 | Sanken Electric Co Ltd | Led power supply device |
| WO2019000924A1 (en) * | 2017-06-27 | 2019-01-03 | 深圳创维－Rgb电子有限公司 | Led light bar network current foldback circuit, driving power supply and tv set |
| US10997900B2 (en) | 2017-06-27 | 2021-05-04 | Shenzhen Chuangwei-Rgb Electronic Co., Ltd. | LED light bar network current foldback circuit, driving power supply and TV set |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7636037B2 (en) | Vehicle lighting apparatus | |
| US7528553B2 (en) | Lighting control apparatus for vehicle lighting device | |
| US7327051B2 (en) | Lighting control circuit for vehicle lamps | |
| JP4771354B2 (en) | Lighting control circuit for vehicular lamp | |
| US7964987B2 (en) | Light emitting apparatus | |
| US10360969B2 (en) | Light emitting element driving semiconductor integrated circuit, light emitting element driving device, light emitting device, and vehicle | |
| JP2006210219A (en) | Lighting control circuit of vehicular lighting fixture | |
| US8330375B2 (en) | Vehicle lamp lighting control device | |
| US7329994B2 (en) | Lighting system for vehicle | |
| US20190098710A1 (en) | Lighting circuit and vehicle lamp | |
| JP2003317978A (en) | Lighting circuit for on-vehicle led lighting fixture | |
| JP2007157423A (en) | Power supply device | |
| JP2006103404A (en) | Lighting control circuit of vehicle lamp | |
| US20050029961A1 (en) | Circuit assembly for operating a luminous signal | |
| JP2008251320A (en) | Lighting circuit for vehicular lighting fixture | |
| JP2002270384A (en) | Protecting circuit of current driving element for lighting fixture | |
| JP7408448B2 (en) | Light source module and lighting circuit | |
| US20230104439A1 (en) | Light source module and lighting circuit | |
| WO2020184576A1 (en) | Vehicle lamp and lighting circuit | |
| KR102016718B1 (en) | Apparatus for controlling of lamp for vehicle | |
| US11382194B2 (en) | Lighting circuit | |
| US20240166131A1 (en) | Lamp control device | |
| US10869375B2 (en) | Vehicle lighting device | |
| TWM653795U (en) | Light emitting diode driving circuit | |
| JP2024047822A (en) | Lighting circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20050311 |
|
| A762 | Written abandonment of application |
Free format text: JAPANESE INTERMEDIATE CODE: A762 Effective date: 20070719 |