JP2016081810A - Light emitting module and illuminating device - Google Patents

Light emitting module and illuminating device Download PDF

Info

Publication number
JP2016081810A
JP2016081810A JP2014213803A JP2014213803A JP2016081810A JP 2016081810 A JP2016081810 A JP 2016081810A JP 2014213803 A JP2014213803 A JP 2014213803A JP 2014213803 A JP2014213803 A JP 2014213803A JP 2016081810 A JP2016081810 A JP 2016081810A
Authority
JP
Japan
Prior art keywords
current
short
terminals
lighting device
light emitting
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.)
Granted
Application number
JP2014213803A
Other languages
Japanese (ja)
Other versions
JP6350821B2 (en
Inventor
美昭 原
Yoshiaki Hara
美昭 原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Lighting and Technology Corp
Original Assignee
Toshiba Lighting and Technology Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Lighting and Technology Corp filed Critical Toshiba Lighting and Technology Corp
Priority to JP2014213803A priority Critical patent/JP6350821B2/en
Publication of JP2016081810A publication Critical patent/JP2016081810A/en
Application granted granted Critical
Publication of JP6350821B2 publication Critical patent/JP6350821B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Abstract

PROBLEM TO BE SOLVED: To provide an LED module that is able to prevent input of excessive current and an illuminating device having the same.SOLUTION: An LED module 13 comprises a pair of terminals 21, 21; an LED 22; a detection resistor R1, and a short circuit 25. The pair of terminals 21, 21 are connected to the output side of a lighting device 12 that has a short-circuit protecting circuit 16 for reducing at least output current when output causes a short-circuit. The LED 22 is connected between terminals 21, 21 and turned on by the lighting device 12. The detection resistor R1 detects current flowing in the LED 22. The short circuit 25 causes a short circuit between the terminals 21, 21 when current detected by the detection resistor R1 exceeds the predetermined value.SELECTED DRAWING: Figure 1

Description

本発明の実施形態は、点灯装置により点灯される発光素子を端子間に有する発光モジュールおよびこれを備えた照明装置に関する。   Embodiments described herein relate generally to a light-emitting module having a light-emitting element that is turned on by a lighting device between terminals, and an illumination device including the light-emitting module.

従来、例えば異なる明るさの発光モジュールを選択的に接続可能な点灯装置がある。このような点灯装置は、所定の電流を供給することで、各発光モジュールを点灯させる。   Conventionally, for example, there is a lighting device that can selectively connect light emitting modules having different brightnesses. Such a lighting device lights each light emitting module by supplying a predetermined current.

このような点灯装置として、発光モジュールに短絡などの異常が生じた場合、発光モジュールに流れる電流値を低減することで発光モジュールなどを保護する保護回路を備えたものがある。しかしながら、点灯装置が出力電流を可変制御できない場合には、このような保護回路を適用できない。   As such a lighting device, there is one provided with a protection circuit that protects the light emitting module and the like by reducing the value of a current flowing through the light emitting module when an abnormality such as a short circuit occurs in the light emitting module. However, such a protection circuit cannot be applied when the lighting device cannot variably control the output current.

また、発光モジュールが、この発光モジュールに適合しない点灯装置に対して接続されて定格電流を超える電流が流れたときにも、電流の流入を停止することが求められる。すなわち、過大な電流が流れたときに発光モジュールへの電流の流入を防止することが求められる。   In addition, when the light emitting module is connected to a lighting device that is not compatible with the light emitting module and a current exceeding the rated current flows, it is required to stop the inflow of the current. That is, it is required to prevent the current from flowing into the light emitting module when an excessive current flows.

特開２００６−１０８５１９号公報JP 2006-108519 A

本発明が解決しようとする課題は、過大な電流の入力を防止できる発光モジュールおよびこれを備えた照明装置を提供することである。   The problem to be solved by the present invention is to provide a light emitting module capable of preventing an excessive current input and a lighting apparatus including the light emitting module.

実施形態の発光モジュールは、対をなす端子と、発光素子と、電流検出部と、短絡回路とを有する。対をなす端子は、出力が短絡したときに出力電流を少なくとも低減させる短絡保護回路を備えた点灯装置の出力側に接続される。発光素子は、端子間に接続され、点灯装置により点灯される。電流検出部は、発光素子に流れる電流を検出する。短絡回路は、電流検出部により検出された電流が所定値を超えると端子間を短絡させる。   The light emitting module of the embodiment includes a pair of terminals, a light emitting element, a current detection unit, and a short circuit. The paired terminals are connected to the output side of the lighting device having a short-circuit protection circuit that at least reduces the output current when the output is short-circuited. The light emitting element is connected between terminals and is lit by a lighting device. The current detection unit detects a current flowing through the light emitting element. The short circuit shorts between the terminals when the current detected by the current detection unit exceeds a predetermined value.

本発明によれば、電流検出部により発光素子に流れる電流が所定値を超えたことを検出すると、短絡回路が端子間を短絡させることで、この短絡により点灯装置の短絡保護回路が出力電流を少なくとも低減するので、過大な電流の入力を防止することが期待できる。   According to the present invention, when the current detection unit detects that the current flowing through the light emitting element exceeds a predetermined value, the short circuit causes the terminals to be short-circuited, and this short circuit causes the short circuit protection circuit of the lighting device to output current. Since it is reduced at least, it can be expected that input of an excessive current is prevented.

第１の実施形態の発光モジュールを備えた照明装置を示す回路図である。It is a circuit diagram which shows the illuminating device provided with the light emitting module of 1st Embodiment. 第２の実施形態の発光モジュールを備えた照明装置を示す回路図である。It is a circuit diagram which shows the illuminating device provided with the light emitting module of 2nd Embodiment.

以下、第１の実施形態の構成を、図１を参照して説明する。   The configuration of the first embodiment will be described below with reference to FIG.

図１において、11は照明装置であり、この照明装置11は、点灯装置12と、この点灯装置12に接続されて点灯される発光モジュールであるＬＥＤモジュール13とを備えている。   In FIG. 1, reference numeral 11 denotes an illumination device, and the illumination device 11 includes a lighting device 12 and an LED module 13 that is a light emitting module that is connected to the lighting device 12 and is lit.

点灯装置12は、外部電源(商用交流電源)ｅと接続され、例えばＬＥＤモジュール13に対して直流定電流を供給する他励形のインバータ回路などを備えた点灯装置である。この点灯装置12には、対をなす(一対の)出力端子15，15が設けられているとともに、これら出力端子15，15間が短絡したときに保護動作、すなわち点灯装置12からの出力電流を低減または停止する(出力電流を少なくとも低減する)短絡保護回路16が設けられている。   The lighting device 12 is a lighting device that is connected to an external power source (commercial AC power source) e and includes a separately-excited inverter circuit that supplies a constant DC current to the LED module 13, for example. This lighting device 12 is provided with a pair of (a pair of) output terminals 15 and 15, and when the output terminals 15 and 15 are short-circuited, a protective operation, that is, an output current from the lighting device 12 is reduced. A short circuit protection circuit 16 is provided that reduces or stops (at least reduces the output current).

ＬＥＤモジュール13は、例えば直管形のモジュールなどであり、出力端子15，15に着脱可能に接続される対をなす端子21，21を備えるとともに、これら端子21，21間に、発光素子であるＬＥＤ22と電流検出部としての電流検出素子である検出抵抗R1との直列回路24と、短絡回路25とが並列に接続されている。   The LED module 13 is a straight tube module, for example, and includes a pair of terminals 21 and 21 that are detachably connected to the output terminals 15 and 15, and is a light emitting element between the terminals 21 and 21. A series circuit 24 of the LED 22 and a detection resistor R1, which is a current detection element as a current detection unit, and a short circuit 25 are connected in parallel.

端子21，21は、一方が給電側、他方が接地側(非給電側)となっている。   One of the terminals 21 and 21 is a power supply side, and the other is a ground side (non-power supply side).

ＬＥＤ22は、アノード側が給電側の端子21と接続され、カソード側が検出抵抗R1と接続されている。このＬＥＤ22は、単数でもよいし複数を直列に接続してもよい。   The LED 22 has an anode side connected to the power supply side terminal 21 and a cathode side connected to the detection resistor R1. The LED 22 may be singular or plural may be connected in series.

検出抵抗R1は、抵抗値が小さい抵抗であり、ＬＥＤ22に流れる電流、すなわち負荷電流に比例した電圧を生じさせることで、負荷電流を電圧として検出するようになっている。   The detection resistor R1 is a resistor having a small resistance value, and detects the load current as a voltage by generating a current flowing through the LED 22, that is, a voltage proportional to the load current.

また、短絡回路25は、例えば抵抗R2およびスイッチング素子Ｑとの直列回路を備えるとともに、スイッチング素子Ｑの制御端子であるゲート端子が、定電圧素子であるツェナダイオードZDを介して、直列回路24のＬＥＤ22と検出抵抗R1との接続点に接続されている。   Further, the short circuit 25 includes, for example, a series circuit of a resistor R2 and a switching element Q, and the gate terminal that is a control terminal of the switching element Q is connected to the series circuit 24 via a Zener diode ZD that is a constant voltage element. It is connected to a connection point between the LED 22 and the detection resistor R1.

抵抗R2は、短絡回路25に流れる電流の値を短絡保護回路16が短絡と判断する電流値以上に設定するとともにスイッチング素子Ｑを保護する限流抵抗である。   The resistor R2 is a current limiting resistor that sets the value of the current flowing through the short circuit 25 to be equal to or greater than the current value that the short circuit protection circuit 16 determines to be a short circuit, and protects the switching element Q.

スイッチング素子Ｑは、例えばエンハンスメント形のｎ型ＭＯＳＦＥＴなどが用いられ、ドレイン端子が抵抗R2と接続され、ソース端子が接地側の端子21と接続されている。   As the switching element Q, for example, an enhancement type n-type MOSFET is used, the drain terminal is connected to the resistor R2, and the source terminal is connected to the ground-side terminal 21.

次に、上記第１の実施形態の動作を説明する。   Next, the operation of the first embodiment will be described.

点灯装置12は、外部電源を電力変換して、出力端子15，15間に接続されたＬＥＤモジュール13に対して直流定電流を供給する。ＬＥＤモジュール13では、点灯装置12から供給された直流定電流がＬＥＤ22に流れて、ＬＥＤ22が点灯する。   The lighting device 12 converts an external power supply into electric power and supplies a constant DC current to the LED module 13 connected between the output terminals 15 and 15. In the LED module 13, the DC constant current supplied from the lighting device 12 flows to the LED 22, and the LED 22 lights up.

このとき、例えばＬＥＤモジュール13に流れる電流(負荷電流)がＬＥＤモジュール13の定格電流などの所定の電流値以下である場合には、検出抵抗R1に生じる電圧が所定値よりも小さく、この検出抵抗R1に生じる電圧に対してツェナダイオードZDにより設定されるスイッチング素子Ｑのゲートソース間電圧が所定のオン電圧とならず、スイッチング素子Ｑはオフ状態を維持する。すなわち、短絡回路25は動作せず、検出抵抗R1での電力消費も抑制される。   At this time, for example, when the current (load current) flowing through the LED module 13 is equal to or less than a predetermined current value such as the rated current of the LED module 13, the voltage generated in the detection resistor R1 is smaller than the predetermined value, The gate-source voltage of the switching element Q set by the Zener diode ZD with respect to the voltage generated at R1 does not become a predetermined on-voltage, and the switching element Q maintains the off state. That is, the short circuit 25 does not operate, and power consumption at the detection resistor R1 is also suppressed.

一方、ＬＥＤモジュール13に定格電流などの所定の電流値以上の電流が流れ、検出抵抗R1に生じる電圧が所定値を超えた場合には、この検出抵抗R1に生じる電圧に対してツェナダイオードZDにより設定されるスイッチング素子Ｑのゲートソース間電圧がオン電圧となり、スイッチング素子Ｑがオンする。このため、短絡回路25により端子21，21間が実質的に短絡される。この結果、点灯装置12では、端子21，21と接続された出力端子15，15間が短絡することとなり、この短絡により短絡保護回路16の閾値より抵抗R2を流れる電流が大きくなることにより、短絡保護回路16が動作し、ＬＥＤモジュール13への出力を低減または停止する。   On the other hand, when a current exceeding a predetermined current value such as a rated current flows through the LED module 13 and the voltage generated in the detection resistor R1 exceeds a predetermined value, the Zener diode ZD The gate-source voltage of the switching element Q to be set becomes the on voltage, and the switching element Q is turned on. For this reason, the terminals 21 and 21 are substantially short-circuited by the short circuit 25. As a result, in the lighting device 12, the output terminals 15 and 15 connected to the terminals 21 and 21 are short-circuited, and this short-circuit causes the current flowing through the resistor R2 to be larger than the threshold of the short-circuit protection circuit 16, thereby causing a short circuit. The protection circuit 16 operates to reduce or stop the output to the LED module 13.

このように、上記第１の実施形態によれば、検出抵抗R1によりＬＥＤ22に流れる電流が所定値を超えたことを検出すると、短絡回路25が端子21，21間を短絡させることで、この短絡により点灯装置12の短絡保護回路16が出力電流を少なくとも低減、すなわち低減または停止するので、ＬＥＤモジュール13への過大な電流の入力を防止できる。   Thus, according to the first embodiment, when the detection resistor R1 detects that the current flowing through the LED 22 exceeds a predetermined value, the short circuit 25 causes the terminals 21 and 21 to be short-circuited. As a result, the short-circuit protection circuit 16 of the lighting device 12 at least reduces the output current, that is, reduces or stops the current, so that an excessive current input to the LED module 13 can be prevented.

特に、異なる明るさのＬＥＤモジュール13を選択的に点灯装置12に接続可能である場合、点灯装置12から出力される電流よりも定格電流が小さいＬＥＤモジュール13を誤って取り付けることが想定されるため、このような場合であっても、ＬＥＤモジュール13の短絡回路25によって短絡を生じさせて短絡保護回路16の保護動作により点灯装置12からの電流を低減または停止することで、過大な電流の入力に伴うＬＥＤモジュール13や点灯装置12へのダメージを確実に防止できる。   In particular, when LED modules 13 having different brightness can be selectively connected to the lighting device 12, it is assumed that the LED module 13 having a rated current smaller than the current output from the lighting device 12 is erroneously attached. Even in such a case, an excessive current is input by causing a short circuit by the short circuit 25 of the LED module 13 and reducing or stopping the current from the lighting device 12 by the protective operation of the short circuit protection circuit 16. It is possible to reliably prevent the LED module 13 and the lighting device 12 from being damaged.

次に、第２の実施形態を、図２を参照して説明する。なお、上記第１の実施形態と同様の構成および作用については、同一符号を付してその説明を省略する。   Next, a second embodiment will be described with reference to FIG. In addition, about the structure and effect | action similar to the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

この第２の実施形態は、上記第１の実施形態のＬＥＤモジュール13が、検出抵抗R1に代えて、(正)温度特性を有する電流検出部および温度検出部としての検出抵抗R3を備えるものである。   In the second embodiment, the LED module 13 of the first embodiment includes a current detection unit having a (positive) temperature characteristic and a detection resistor R3 as a temperature detection unit instead of the detection resistor R1. is there.

検出抵抗R3は、例えば温度の上昇に伴って抵抗値が増加するＰＴＣサーミスタである。   The detection resistor R3 is a PTC thermistor whose resistance value increases with an increase in temperature, for example.

このため、例えば照明装置11の使用環境温度が相対的に高い場合、検出抵抗R3の抵抗値が相対的に増加するので、スイッチング素子Ｑのゲートソース間電圧がより小さい負荷電流に対してオン電圧となり、より小さい負荷電流に対して短絡保護回路16が動作する。反対に、照明装置11の使用環境温度が相対的に低い場合、検出抵抗R3の抵抗値が相対的に減少するので、スイッチング素子Ｑのゲートソース間電圧がより大きい負荷電流に対してオン電圧となり、より大きい負荷電流に対して短絡保護回路16が動作する。   For this reason, for example, when the use environment temperature of the lighting device 11 is relatively high, the resistance value of the detection resistor R3 relatively increases, so that the gate-source voltage of the switching element Q is smaller than the load current with respect to the smaller load current. Thus, the short circuit protection circuit 16 operates for a smaller load current. On the other hand, when the operating environment temperature of the lighting device 11 is relatively low, the resistance value of the detection resistor R3 is relatively reduced, so that the gate-source voltage of the switching element Q becomes an on-voltage for a larger load current. The short-circuit protection circuit 16 operates for a larger load current.

換言すれば、検出抵抗R3により検出された電流が所定値を超えるとともに検出抵抗R3により検出した温度が所定値を超えると短絡回路25が端子21，21間を短絡させる。この結果、この短絡により点灯装置12の短絡保護回路16が出力電流を少なくとも低減、すなわち低減または停止するので、ＬＥＤモジュール13への過大な電流の流入を防止できる。   In other words, when the current detected by the detection resistor R3 exceeds a predetermined value and the temperature detected by the detection resistor R3 exceeds a predetermined value, the short circuit 25 shorts between the terminals 21 and 21. As a result, this short circuit causes the short circuit protection circuit 16 of the lighting device 12 to at least reduce, that is, reduce or stop the output current, so that an excessive current flow into the LED module 13 can be prevented.

点灯装置12やＬＥＤモジュール13を構成する各部品(電子部品)は、一般に高温であるほど寿命が短い傾向があるため、使用環境温度が相対的に高い場合には、相対的に低い場合よりも検出抵抗R3の抵抗値が相対的に大きくなって、いわば短絡回路25が動作するためのＬＥＤ22に流れる電流の閾値を下げることとなるので、より早期に短絡回路25を動作させ、使用環境温度に応じてより適切にＬＥＤモジュール13への過大な電流の流入を防止できる。   Each component (electronic component) constituting the lighting device 12 and the LED module 13 generally tends to have a shorter life as the temperature is higher. Therefore, when the operating environment temperature is relatively high, it is lower than when the temperature is relatively low. Since the resistance value of the detection resistor R3 becomes relatively large, so to speak, the threshold value of the current flowing through the LED 22 for operating the short circuit 25 is lowered, so that the short circuit 25 is operated earlier and the operating environment temperature is reached. Accordingly, it is possible to prevent an excessive current from flowing into the LED module 13 more appropriately.

なお、上記第２の実施形態において、温度検出部は、検出抵抗R3と別個に設定してもよい。   In the second embodiment, the temperature detection unit may be set separately from the detection resistor R3.

また、上記各実施形態において、発光素子としては、ＬＥＤに限らず、例えば有機ＥＬ素子などを用いることもできる。   In each of the above embodiments, the light emitting element is not limited to an LED, and for example, an organic EL element can be used.

そして、以上説明した少なくとも一つの実施形態によれば、点灯装置12に一般的に備えられている短絡保護回路16を有効に利用して過大な電流の入力を防止するＬＥＤモジュール13を備えることで、複雑な検出回路などを設けることなく、ＬＥＤモジュール13側で誤装着などに起因する点灯装置12やＬＥＤモジュール13へのダメージを確実に防止した照明装置11を提供できる。   According to at least one embodiment described above, the LED module 13 that effectively uses the short-circuit protection circuit 16 generally provided in the lighting device 12 to prevent an excessive current input is provided. Without providing a complicated detection circuit, it is possible to provide the lighting device 11 that reliably prevents damage to the lighting device 12 and the LED module 13 due to erroneous mounting or the like on the LED module 13 side.

本発明のいくつかの実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。   Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

11 照明装置
12 点灯装置
13 発光モジュールであるＬＥＤモジュール
16 短絡保護回路
21 端子
22 発光素子であるＬＥＤ
25 短絡回路
R1 電流検出部としての検出抵抗
R3 電流検出部および温度検出部としての検出抵抗 11 Lighting equipment
12 Lighting device
13 LED module which is a light emitting module
16 Short circuit protection circuit
21 terminals
22 LEDs as light emitting elements
25 Short circuit
R1 Sense resistor as current detector
R3 Sense resistor as current detector and temperature detector

Claims (3)

出力が短絡したときに出力電流を少なくとも低減させる短絡保護回路を備えた点灯装置の出力側に接続される対をなす端子と；
これら端子間に接続され、点灯装置により点灯される発光素子と；
この発光素子に流れる電流を検出する電流検出部と；
この電流検出部により検出された電流が所定値を超えると端子間を短絡させる短絡回路と；
を具備していることを特徴とする発光モジュール。 A pair of terminals connected to the output side of the lighting device having a short-circuit protection circuit that at least reduces the output current when the output is short-circuited;
A light emitting element connected between these terminals and lit by a lighting device;
A current detector for detecting a current flowing through the light emitting element;
A short circuit that short-circuits between the terminals when the current detected by the current detection unit exceeds a predetermined value;
A light emitting module comprising: 温度を検出する温度検出部を具備し、
短絡回路は、電流検出部により検出された電流が所定値を超えるとともに温度検出部により検出した温度が所定値を超えると端子間を短絡させる
ことを特徴とする請求項１記載の発光モジュール。 A temperature detection unit for detecting the temperature;
2. The light emitting module according to claim 1, wherein the short circuit shorts between the terminals when the current detected by the current detection unit exceeds a predetermined value and the temperature detected by the temperature detection unit exceeds a predetermined value. 出力が短絡したときに保護動作する短絡保護回路を備えた点灯装置と；
この点灯装置の出力側に対をなす端子が接続される請求項１または２記載の発光モジュールと；
を具備していることを特徴とする照明装置。 A lighting device provided with a short-circuit protection circuit that performs a protective operation when the output is short-circuited;
The light emitting module according to claim 1 or 2, wherein a pair of terminals are connected to the output side of the lighting device;
An illumination device comprising:
JP2014213803A 2014-10-20 2014-10-20 Light emitting module and lighting device Expired - Fee Related JP6350821B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2014213803A JP6350821B2 (en) 2014-10-20 2014-10-20 Light emitting module and lighting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2014213803A JP6350821B2 (en) 2014-10-20 2014-10-20 Light emitting module and lighting device

Publications (2)

Publication Number Publication Date
JP2016081810A true JP2016081810A (en) 2016-05-16
JP6350821B2 JP6350821B2 (en) 2018-07-04

Family

ID=55958909

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2014213803A Expired - Fee Related JP6350821B2 (en) 2014-10-20 2014-10-20 Light emitting module and lighting device

Country Status (1)

Country Link
JP (1) JP6350821B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108322963A (en) * 2018-03-20 2018-07-24 欧普照明股份有限公司 A kind of short-circuit detection protection circuit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008084614A (en) * 2006-09-26 2008-04-10 Matsushita Electric Works Ltd Lighting device
JP2011216316A (en) * 2010-03-31 2011-10-27 Toshiba Lighting & Technology Corp Led lighting device, and led luminaire
US20120229047A1 (en) * 2011-03-09 2012-09-13 Chunghwa Picture Tubes, Ltd. Backlight module, over-temperature protection circuit and over-temperature protection method thereof
JP2014146634A (en) * 2013-01-28 2014-08-14 Rohm Co Ltd Led driving device and led lighting device
JP2014154525A (en) * 2013-02-14 2014-08-25 Iwasaki Electric Co Ltd Led lighting device, led bulb, and led module board
JP2014235966A (en) * 2013-06-05 2014-12-15 岩崎電気株式会社 Led illuminating device, led unit, and outdoor illuminating fixture

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008084614A (en) * 2006-09-26 2008-04-10 Matsushita Electric Works Ltd Lighting device
JP2011216316A (en) * 2010-03-31 2011-10-27 Toshiba Lighting & Technology Corp Led lighting device, and led luminaire
US20120229047A1 (en) * 2011-03-09 2012-09-13 Chunghwa Picture Tubes, Ltd. Backlight module, over-temperature protection circuit and over-temperature protection method thereof
JP2014146634A (en) * 2013-01-28 2014-08-14 Rohm Co Ltd Led driving device and led lighting device
JP2014154525A (en) * 2013-02-14 2014-08-25 Iwasaki Electric Co Ltd Led lighting device, led bulb, and led module board
JP2014235966A (en) * 2013-06-05 2014-12-15 岩崎電気株式会社 Led illuminating device, led unit, and outdoor illuminating fixture

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108322963A (en) * 2018-03-20 2018-07-24 欧普照明股份有限公司 A kind of short-circuit detection protection circuit
CN108322963B (en) * 2018-03-20 2024-03-05 欧普照明股份有限公司 Short circuit detection protection circuit

Also Published As

Publication number Publication date
JP6350821B2 (en) 2018-07-04

Similar Documents

Publication Publication Date Title
US8917033B2 (en) Open circuit protecting circuit, open circuit protecting method and illuminating apparatus
JP4975083B2 (en) Light source lighting device and lighting device
US9351366B1 (en) Isolation dimmer circuit structure
JP2011034547A (en) Constant current device and led device using the same
US8896319B2 (en) Light emitting device control circuit and short detection circuit thereof
US8749176B2 (en) Lamp driving device
JP2017056854A (en) Display lamp device
JP6339470B2 (en) LED lighting device and LED lighting device
JP2008300209A (en) Lighting system
JP6421618B2 (en) LED module and LED lighting device
JP6350821B2 (en) Light emitting module and lighting device
US8072162B2 (en) Bi-direction constant current device
KR20130056085A (en) Short protection circuit of led lighting part
US9307610B2 (en) Low power bypass circuit for LED open circuit and reverse polarity protection
JP6754241B2 (en) LED light emitting device
EP3086377A1 (en) Led driver circuit and method for controlling led driver circuit
JP2009093216A (en) Power supply unit and lighting apparatus
JP2013201019A (en) Lighting circuit and lighting device
JP2013229233A (en) Emergency lighting device
JP2019192478A (en) Lighting fixture for vehicle
KR20110134607A (en) Power supply circuit for led string
JP6564257B2 (en) Power supply circuit
JP2017103156A (en) Protective device for power supply unit and circuit device
KR20160110799A (en) Circuit and method for detecting short circuit in LED lamp
TW201526708A (en) Device for protecting a low voltage LED direct driver

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20170316

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20171215

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20171227

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20180226

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20180509

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20180522

R151 Written notification of patent or utility model registration

Ref document number: 6350821

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151

LAPS Cancellation because of no payment of annual fees