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JP2014235967A - Led lighting device and led illuminating fixture - Google Patents

Led lighting device and led illuminating fixture Download PDF

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JP2014235967A
JP2014235967A JP2013118660A JP2013118660A JP2014235967A JP 2014235967 A JP2014235967 A JP 2014235967A JP 2013118660 A JP2013118660 A JP 2013118660A JP 2013118660 A JP2013118660 A JP 2013118660A JP 2014235967 A JP2014235967 A JP 2014235967A
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led
voltage
lighting device
led lighting
potential side
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JP6205869B2 (en
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良明 山口
Yoshiaki Yamaguchi
良明 山口
信義 田島
Nobuyoshi Tajima
信義 田島
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Iwasaki Denki KK
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Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting device capable of making illuminance substantially constant to change in environment temperature.SOLUTION: An LED lighting device 200 comprises: a DC power supply circuit 220 supplying a DC current to an LED 301; a current detection circuit 230 converting an LED current flowing in the LED 301 into a first voltage V1 with a first conversion rate; a voltage detection circuit 240 converting an LED voltage applied to the LED 301 into a second voltage V2 with a second conversion rate; and a control circuit 250 controlling an output of the DC power supply circuit 220 so that a sum of the first voltage V1 and the second voltage V2 becomes constant at a predetermined value Vref.

Description

本発明はLED点灯装置及びそれを用いたLED照明器具に関する。   The present invention relates to an LED lighting device and an LED lighting apparatus using the LED lighting device.

特許文献1はLEDに対して定電流制御及び定電力制御を行うLED駆動装置を開示する。同文献のLED駆動装置(60)は、駆動部(61)と、LEDユニット(3)に直列接続されてLEDの駆動電流を検出する抵抗(43)とを備え、駆動部(61)はLEDの駆動電流が一定となるように定電流制御を行う。また、同文献のLED駆動装置(4)はさらに、LEDユニット(3)に並列接続されてLEDの駆動電圧を検出する抵抗(41、42)を備え、駆動部(5)はLEDの駆動電流と駆動電圧の積からなる消費電力が一定となるように定電力制御を行う。   Patent Document 1 discloses an LED driving device that performs constant current control and constant power control on an LED. The LED drive device (60) of the same document includes a drive unit (61) and a resistor (43) that is connected in series to the LED unit (3) and detects the drive current of the LED, and the drive unit (61) is an LED. The constant current control is performed so that the drive current is constant. Further, the LED drive device (4) of the same document further includes resistors (41, 42) that are connected in parallel to the LED unit (3) and detect the drive voltage of the LED, and the drive unit (5) is a drive current of the LED. The constant power control is performed so that the power consumption consisting of the product of the driving voltage and the driving voltage is constant.

特開2006−210836号公報JP 2006-210836 A

しかし、詳細を後述するように、LEDを定電流制御又は定電力制御したのではLEDが配置される環境の温度変化に対する照度の変化を抑制できない。これは、定電流制御においては、環境温度が低下すると、LED電圧の上昇に起因してLED電力が上昇し、そのLED電力の上昇に伴い照度が上昇してしまうことによる。またさらに、環境温度低下時においてLED電力の上昇率よりも照度の上昇率が大きいため、定電力制御によってLED電力を一定としても環境温度低下時には照度が上昇してしまう。このようにLEDに対して定電流制御又は定電力制御を行ったとしても、低温時には、照度の上昇分だけ無駄な電力が消費されてしまうことになる。従って、環境温度低下時の照度上昇を抑制することが望まれる。   However, as will be described in detail later, if the LED is subjected to constant current control or constant power control, a change in illuminance with respect to a temperature change in the environment in which the LED is disposed cannot be suppressed. This is because in constant current control, when the environmental temperature decreases, the LED power increases due to an increase in the LED voltage, and the illuminance increases as the LED power increases. Furthermore, since the increase rate of the illuminance is larger than the increase rate of the LED power when the environmental temperature decreases, the illuminance increases when the environmental temperature decreases even if the LED power is constant by constant power control. Thus, even if constant current control or constant power control is performed on the LED, useless power is consumed by an increase in illuminance at low temperatures. Therefore, it is desired to suppress an increase in illuminance when the environmental temperature decreases.

そこで、本発明は、環境温度の変化に対して照度を略一定にすることができるLED点灯装置及びLED照明器具を提供することを課題とする。   Then, this invention makes it a subject to provide the LED lighting device and LED lighting fixture which can make illumination intensity substantially constant with respect to the change of environmental temperature.

本発明のLED点灯装置は、LEDに直流電流を供給する直流電源回路と、LEDに流れるLED電流を第1の変換率で第1の電圧に変換する電流検出回路と、LEDに印加されるLED電圧を第2の変換率で第2の電圧に変換する電圧検出回路と、第1の電圧と第2の電圧の和が所定値で一定となるように直流電源回路の出力を制御する制御回路とを備える。   An LED lighting device according to the present invention includes a DC power supply circuit that supplies a direct current to the LED, a current detection circuit that converts the LED current flowing through the LED to a first voltage at a first conversion rate, and an LED that is applied to the LED. A voltage detection circuit for converting the voltage to the second voltage at a second conversion rate, and a control circuit for controlling the output of the DC power supply circuit so that the sum of the first voltage and the second voltage is constant at a predetermined value With.

本発明のLED点灯装置によると、第1の電圧と第2の電圧の和が所定値で一定となるように直流電源回路の出力が制御されるので、LED電圧の増加に対してLED電流及びLED電力を減少させることができる。これにより、LED電圧の上昇に伴う照度の上昇を抑制し、照度を略一定に保つことが可能となる。   According to the LED lighting device of the present invention, the output of the DC power supply circuit is controlled so that the sum of the first voltage and the second voltage is constant at a predetermined value. LED power can be reduced. Thereby, an increase in illuminance accompanying an increase in LED voltage can be suppressed, and the illuminance can be kept substantially constant.

ここで、LEDの環境温度の低下に対してLED電流とLED電圧の積が減少するように第1の変換率及び第2の変換率が決定される。例えば、LEDの環境温度の低下に対して、LED電流減少の変化量がLED電圧増加の変化量よりも大きくなるように第1の変換率及び第2の変換率が決定される。これにより、環境温度の低下に対してLED電力を減少させることができ、照度の過剰な増加を抑制することができる。従って、環境温度の低下に伴う照度の過剰な上昇に起因する無駄な消費電力を節約することができる。   Here, the first conversion rate and the second conversion rate are determined so that the product of the LED current and the LED voltage decreases with respect to the decrease in the environmental temperature of the LED. For example, the first conversion rate and the second conversion rate are determined so that the change amount of the LED current decrease is larger than the change amount of the LED voltage increase with respect to the decrease in the environmental temperature of the LED. Thereby, LED electric power can be reduced with respect to the fall of environmental temperature, and the excessive increase in illumination intensity can be suppressed. Therefore, useless power consumption due to an excessive increase in illuminance accompanying a decrease in environmental temperature can be saved.

上記のLED点灯装置は、さらに高電位側出力端子及び低電位側出力端子を有し、直流電源回路は高電位側出力ノード及び低電位側出力ノードを有し、高電位側出力ノードが高電位側出力端子に接続される。電流検出回路は、低電位側出力ノードと低電位側出力端子の間に接続された電流検出抵抗からなり、電圧検出回路は、高電位側出力端子と低電位側出力端子の間に接続された高電位側の第1の抵抗及び低電位側の第2の抵抗の直列回路からなり、第1の電圧が電流検出抵抗に発生する電圧であり、第2の電圧が第2の抵抗に発生する電圧となるように構成した。これにより、簡素な構成で上述の効果を得ることができる。   The LED lighting device further has a high potential side output terminal and a low potential side output terminal, the DC power supply circuit has a high potential side output node and a low potential side output node, and the high potential side output node is a high potential. Connected to the side output terminal. The current detection circuit includes a current detection resistor connected between the low potential side output node and the low potential side output terminal, and the voltage detection circuit is connected between the high potential side output terminal and the low potential side output terminal. It consists of a series circuit of a first resistor on the high potential side and a second resistor on the low potential side. The first voltage is a voltage generated in the current detection resistor, and the second voltage is generated in the second resistor. It comprised so that it might become a voltage. Thereby, the above-described effects can be obtained with a simple configuration.

本発明のLED照明器具は、上記のLED点灯装置と、LEDが実装されたLEDモジュールと、LED点灯装置及びLEDモジュールを内包するケースとを備える。これにより、あらゆる環境温度範囲においても照度が一定であり、消費電力の無駄がないLED照明器具を提供することができる。   The LED lighting fixture of this invention is equipped with said LED lighting device, the LED module in which LED was mounted, and the case which encloses an LED lighting device and an LED module. Thereby, the illuminance is constant in any environmental temperature range, and it is possible to provide an LED lighting apparatus that does not waste power consumption.

本発明の実施形態によるLED照明器具を示す図である。It is a figure which shows the LED lighting fixture by embodiment of this invention. 本発明の実施形態によるLED点灯装置を示す図である。It is a figure which shows the LED lighting device by embodiment of this invention. LED照明装置における環境温度−ケース温度特性を示す図である。It is a figure which shows the environmental temperature-case temperature characteristic in a LED lighting apparatus. 図2のLED点灯装置による環境温度−LED電流及びLED電圧特性を示す図である。It is a figure which shows the environmental temperature-LED electric current and LED voltage characteristic by the LED lighting device of FIG. 図2のLED点灯装置の環境温度−LED電力特性を示す図である。It is a figure which shows the environmental temperature-LED electric power characteristic of the LED lighting device of FIG. 図2のLED点灯装置のLED電圧−LED電流及びLED電力特性を示す図である。It is a figure which shows the LED voltage-LED electric current and LED electric power characteristic of the LED lighting device of FIG. 図2のLED点灯装置の環境温度−照度特性を示す図である。It is a figure which shows the environmental temperature-illuminance characteristic of the LED lighting device of FIG. 比較例のLED点灯装置を示す図である。It is a figure which shows the LED lighting device of a comparative example. 図8のLED点灯装置による環境温度−LED電流及びLED電圧特性を示す図である。It is a figure which shows the environmental temperature-LED electric current and LED voltage characteristic by the LED lighting device of FIG. 図8のLED点灯装置の環境温度−LED電力特性を示す図である。It is a figure which shows the environmental temperature-LED electric power characteristic of the LED lighting device of FIG. 図8のLED点灯装置のLED電圧−LED電流及びLED電力特性を示す図である。It is a figure which shows the LED voltage-LED electric current and LED electric power characteristic of the LED lighting device of FIG. 図8のLED点灯装置の環境温度−照度特性を示す図である。It is a figure which shows the environmental temperature-illuminance characteristic of the LED lighting device of FIG. 本発明の変形例によるLED点灯装置を説明する図である。It is a figure explaining the LED lighting device by the modification of this invention.

図1に、本発明の実施形態によるLED照明器具を示す。LED照明器具1はケース100と、ケース100の内部に固定されたLED点灯装置200及びLEDモジュール300とを備え、LED点灯装置200とLEDモジュール300は配線W1及びW2で接続される。LEDモジュール300は複数のLED301を備える。LEDモジュール300はケース100に内包されるが、LEDモジュール300の照射面、即ち、LED301の前面付近には透明のカバー部が配置され、LED301による発光が取り出されるものとする。LED点灯装置200は交流電源AC(例えば、商用電源)からの交流入力を直流出力に変換して、直流出力をLEDモジュール300に供給する。なお、本実施形態では、LED照明器具1が屋外用の防犯灯器具であるものとして説明を行うが、LED照明器具1の用途はこれに限られない。   FIG. 1 shows an LED lighting apparatus according to an embodiment of the present invention. The LED lighting apparatus 1 includes a case 100, an LED lighting device 200 and an LED module 300 fixed inside the case 100, and the LED lighting device 200 and the LED module 300 are connected by wirings W1 and W2. The LED module 300 includes a plurality of LEDs 301. The LED module 300 is included in the case 100, and a transparent cover portion is disposed on the irradiation surface of the LED module 300, that is, in the vicinity of the front surface of the LED 301, and light emitted by the LED 301 is taken out. The LED lighting device 200 converts an AC input from an AC power supply AC (for example, a commercial power supply) into a DC output, and supplies the DC output to the LED module 300. In addition, although this embodiment demonstrates as what the LED lighting fixture 1 is a crime prevention light fixture for the outdoors, the use of the LED lighting fixture 1 is not restricted to this.

図2に、LED点灯装置200の回路構成を示す。LED点灯装置200は、入力端子T1及びT2と高電位側出力端子T3及び低電位側出力端子T4の間に、入力回路210、直流電源回路220、電流検出回路230、電圧検出回路240及び制御回路250を備える。高電位側出力端子T3及び低電位側出力端子T4にはそれぞれ配線W1及びW2が接続される。なお、本明細書における説明において、各回路素子が上記のどの回路に属するかは便宜的なものであり、本発明を拘束するものではない。   FIG. 2 shows a circuit configuration of the LED lighting device 200. The LED lighting device 200 includes an input circuit 210, a DC power supply circuit 220, a current detection circuit 230, a voltage detection circuit 240, and a control circuit between the input terminals T1 and T2, the high potential side output terminal T3, and the low potential side output terminal T4. 250. Wirings W1 and W2 are connected to the high potential side output terminal T3 and the low potential side output terminal T4, respectively. In the description in this specification, it is convenient for each circuit element to belong to which circuit, and the present invention is not bound thereto.

入力回路210は、電流ヒューズ211、コンデンサ212、ダイオードブリッジ213、コンデンサ214、及び必要に応じてノイズフィルタを備える。入力回路210には交流電源ACからの交流電圧が入力され、ダイオードブリッジ213による全波整流出力が出力される。   The input circuit 210 includes a current fuse 211, a capacitor 212, a diode bridge 213, a capacitor 214, and a noise filter as necessary. An AC voltage from the AC power supply AC is input to the input circuit 210, and a full-wave rectified output by the diode bridge 213 is output.

直流電源回路220は、本実施形態では絶縁型フライバックコンバータからなり、力率改善機能を持つ所謂ワンコンバータ方式のフライバック降圧回路を構成する。直流電源回路220は、トランス221、スイッチング素子222、ダイオード223及び平滑コンデンサ224を備える。平滑コンデンサ224の正電極端子は直流電源回路220の高電位側出力ノードN1となり、負電極端子は低電位側出力ノードN2となる。スイッチング素子222のオン期間にトランス221の一次巻線によってエネルギーが蓄積され、スイッチング素子222のオフ期間にそのエネルギーが二次巻線側からダイオード223を介して平滑コンデンサ224に充電される。降圧比は一次巻線に対する二次巻線の巻数比によって決まり、出力電流はスイッチング素子222のオンデューティ(オン期間幅)によって決まる。   In the present embodiment, the DC power supply circuit 220 is composed of an insulating flyback converter, and constitutes a so-called one-converter flyback voltage step-down circuit having a power factor correction function. The DC power supply circuit 220 includes a transformer 221, a switching element 222, a diode 223, and a smoothing capacitor 224. The positive electrode terminal of the smoothing capacitor 224 becomes the high potential side output node N1 of the DC power supply circuit 220, and the negative electrode terminal becomes the low potential side output node N2. Energy is accumulated by the primary winding of the transformer 221 during the ON period of the switching element 222, and the energy is charged to the smoothing capacitor 224 from the secondary winding side via the diode 223 during the OFF period of the switching element 222. The step-down ratio is determined by the turn ratio of the secondary winding to the primary winding, and the output current is determined by the on-duty (on period width) of the switching element 222.

電流検出回路230は低抵抗素子からなる電流検出抵抗(以下、「電流検出抵抗230」ともいう)からなり、低電位側出力ノードN2と低電位側出力端子T4の間に接続される。LED301に流れるLED電流ILEDは、電流検出抵抗230の抵抗値R230で決まる変換率で電圧V1(=ILED×R230)に変換される。 The current detection circuit 230 includes a current detection resistor (hereinafter, also referred to as “current detection resistor 230”) made of a low resistance element, and is connected between the low potential side output node N2 and the low potential side output terminal T4. The LED current I LED flowing through the LED 301 is converted into a voltage V1 (= I LED × R 230 ) at a conversion rate determined by the resistance value R 230 of the current detection resistor 230.

電圧検出回路240は分圧回路からなり、高電位側出力端子T3と低電位側出力端子T4の間に接続された高電位側の分圧抵抗241及び低電位側の分圧抵抗242からなる。なお、分圧抵抗241と分圧抵抗242の接続点を分圧ノードN3というものとする。LEDモジュール300に印加されるLED電圧VLEDは、分圧抵抗241の抵抗値R241と分圧抵抗242の抵抗値R242の比で決まる変換率で電圧V2(=VLED×R242/(R241+R242))に変換される。なお、図2においては、高電位側の分圧抵抗241を1つの抵抗素子で示しているが、分圧抵抗241は直列接続された複数の抵抗素子からなるものであってもよい。 The voltage detection circuit 240 includes a voltage dividing circuit, and includes a high potential side voltage dividing resistor 241 and a low potential side voltage dividing resistor 242 connected between the high potential side output terminal T3 and the low potential side output terminal T4. A connection point between the voltage dividing resistor 241 and the voltage dividing resistor 242 is referred to as a voltage dividing node N3. The LED voltage V LED applied to the LED module 300 is a voltage V2 (= V LED × R 242 / () at a conversion rate determined by the ratio of the resistance value R 241 of the voltage dividing resistor 241 and the resistance value R 242 of the voltage dividing resistor 242. R 241 + R 242 )). In FIG. 2, the voltage dividing resistor 241 on the high potential side is shown as one resistor element, but the voltage dividing resistor 241 may be composed of a plurality of resistor elements connected in series.

制御回路250はオペアンプ251、基準電圧源252、フォトカプラ253及びPWM制御回路254を含む。オペアンプ251の負入力端子(−)には、低電位側出力ノードN2に対する分圧ノードN3の電圧が入力され、オペアンプ251の正入力端子(+)には、低電位側出力ノードN2を基準とする基準電圧源252からの基準電圧Vrefが入力される。オペアンプ251には入力端子と出力端子間に帰還抵抗又はコンデンサ(不図示)が接続され、負入力端子電圧と正入力端子電圧の誤差が出力端子において出力される。オペアンプ251の出力はフォトカプラ253の入力フォトダイオードに入力される。フォトカプラ253では、入力フォトダイオードに流れる電流に応じて出力フォトトランジスタの出力状態が決定され、その出力がPWM制御回路254に入力される。   The control circuit 250 includes an operational amplifier 251, a reference voltage source 252, a photocoupler 253, and a PWM control circuit 254. The voltage of the voltage dividing node N3 with respect to the low potential side output node N2 is input to the negative input terminal (−) of the operational amplifier 251, and the positive input terminal (+) of the operational amplifier 251 is based on the low potential side output node N2. The reference voltage Vref from the reference voltage source 252 is input. A feedback resistor or a capacitor (not shown) is connected to the operational amplifier 251 between the input terminal and the output terminal, and an error between the negative input terminal voltage and the positive input terminal voltage is output at the output terminal. The output of the operational amplifier 251 is input to the input photodiode of the photocoupler 253. In the photocoupler 253, the output state of the output phototransistor is determined according to the current flowing through the input photodiode, and the output is input to the PWM control circuit 254.

PWM制御回路254はフォトカプラ253の出力状態に基づくオン幅でスイッチング素子222をPWM制御する。これにより、制御回路250によって、低電位側出力ノードN2に対する分圧ノードN3の電圧(即ち、上記の電圧V1と電圧V2の和)が基準電圧Vrefで一定となるように直流電源回路220の出力がフィードバック制御される。   The PWM control circuit 254 performs PWM control of the switching element 222 with an ON width based on the output state of the photocoupler 253. As a result, the control circuit 250 causes the output of the DC power supply circuit 220 so that the voltage of the voltage dividing node N3 with respect to the low potential side output node N2 (that is, the sum of the voltage V1 and the voltage V2) is constant at the reference voltage Vref. Is feedback controlled.

LEDモジュール300は入力端子T5及びT6を有し、入力端子T5−T6間には直列接続された複数のLED301からなるLEDアレイが実装される。LEDアレイのアノード端は、入力端子T5及び配線W1を介してLED点灯装置200の高電位側出力端子T3に接続され、LEDアレイのカソード端は、入力端子T6及び配線W2を介して低電位側出力端子T4に接続される。なお、図においては6個のLED301が実装される例を示しているが、LED301の接続数は5個以下であってもよいし7個以上であってもよい。   The LED module 300 has input terminals T5 and T6, and an LED array including a plurality of LEDs 301 connected in series is mounted between the input terminals T5 and T6. The anode end of the LED array is connected to the high potential side output terminal T3 of the LED lighting device 200 via the input terminal T5 and the wiring W1, and the cathode end of the LED array is connected to the low potential side via the input terminal T6 and the wiring W2. Connected to the output terminal T4. In addition, although the figure shows an example in which six LEDs 301 are mounted, the number of connections of the LEDs 301 may be 5 or less, or may be 7 or more.

図3に、LED照明器具1が設置された場所の環境温度(気温)と、LED点灯中のケース100(LEDモジュール300が配置される付近)の内面温度との関係を示す。図示するように、LED点灯中においては、LED点灯装置200及びLEDモジュール300からの発熱により、ケース温度が環境温度よりも約70℃高くなるが、環境温度とケース温度は実質的に線形の関係となる。従って、以降の説明においては、温度に関する説明は全て環境温度を指標として行うものとする。   In FIG. 3, the relationship between the environmental temperature (air temperature) of the place where the LED lighting fixture 1 was installed, and the inner surface temperature of case 100 (LED module 300 vicinity) during LED lighting is shown. As shown in the figure, during LED lighting, the case temperature becomes approximately 70 ° C. higher than the environmental temperature due to heat generation from the LED lighting device 200 and the LED module 300, but the environmental temperature and the case temperature are substantially linearly related. It becomes. Therefore, in the following description, all the descriptions regarding the temperature are performed using the environmental temperature as an index.

環境温度の範囲について、LED照明器具1が比較的温暖な地域に設置された場合を想定すると、夏の夜間には環境温度が30℃程度(横軸右端)になることが予想される。一方、LED照明器具1が寒冷地に設置された場合を想定すると、冬の夜間には環境温度が−20℃程度(横軸左端)になることが予想される。なお、以降の説明においては、環境温度30℃の動作及び特性を設計上の基準として、環境温度−20℃時の動作及び特性に着目する。   Assuming that the LED lighting device 1 is installed in a relatively warm area with respect to the environmental temperature range, the environmental temperature is expected to be about 30 ° C. (the right end of the horizontal axis) during summer night. On the other hand, assuming that the LED lighting apparatus 1 is installed in a cold region, the environmental temperature is expected to be about −20 ° C. (the left end of the horizontal axis) at night in winter. In the following description, the operation and characteristics at an environmental temperature of −20 ° C. will be noted with the operation and characteristics at an environmental temperature of 30 ° C. as the design criteria.

ここで、LED点灯装置200の動作及び特性を説明する前に、図8に示す比較例のLED照明器具2及びLED点灯装置400の動作及び特性を説明する。LED照明器具1(LED点灯装置200)とLED照明器具2(LED点灯装置400)の共通する構成要素には同一の符号を付し、その説明を省略する。LED点灯装置400は、電圧検出回路240を備えない点でLED点灯装置200と異なる。また、図3に示した環境温度とケース温度の関係は、LED照明器具1及び2について同様であるものとする。   Here, before describing the operation and characteristics of the LED lighting device 200, the operations and characteristics of the LED lighting device 2 and the LED lighting device 400 of the comparative example shown in FIG. 8 will be described. The same code | symbol is attached | subjected to the same component of LED lighting fixture 1 (LED lighting device 200) and LED lighting fixture 2 (LED lighting device 400), and the description is abbreviate | omitted. The LED lighting device 400 is different from the LED lighting device 200 in that the voltage detection circuit 240 is not provided. The relationship between the environmental temperature and the case temperature shown in FIG. 3 is the same for the LED lighting devices 1 and 2.

LED点灯装置400の制御回路250において、オペアンプ251の負入力端子(−)には、電流検出抵抗230に発生する電圧のみが入力される。即ち、制御回路250においては、上記の電圧V1が基準電圧Vrefで一定となるように直流電源回路220の出力がフィードバック制御される。これにより、LED電流が定電流制御される。   In the control circuit 250 of the LED lighting device 400, only the voltage generated in the current detection resistor 230 is input to the negative input terminal (−) of the operational amplifier 251. That is, in the control circuit 250, the output of the DC power supply circuit 220 is feedback controlled so that the voltage V1 is constant at the reference voltage Vref. Thereby, the LED current is subjected to constant current control.

図9に、LED点灯装置400による環境温度−LED電流及びLED電圧特性を示す。同図では、横軸が環境温度、左軸がLED電流、右軸がLED電圧であり、LED電流が破線、LED電圧が実線で示される。LED点灯装置400においてはLED電流500mAで定電流制御が行われているので、LED電流は環境温度にかかわらず500mAで一定である。一方、LED電圧は環境温度に対して単調減少する。即ち、環境温度が低下すると、LED電圧は上昇する。   FIG. 9 shows the environmental temperature-LED current and LED voltage characteristics of the LED lighting device 400. In the figure, the horizontal axis is the environmental temperature, the left axis is the LED current, the right axis is the LED voltage, the LED current is indicated by a broken line, and the LED voltage is indicated by a solid line. In the LED lighting device 400, constant current control is performed at an LED current of 500 mA, so the LED current is constant at 500 mA regardless of the environmental temperature. On the other hand, the LED voltage monotonously decreases with respect to the environmental temperature. That is, when the environmental temperature decreases, the LED voltage increases.

図10に、LED点灯装置400の環境温度−LED電力特性を示す。同図では、横軸が環境温度、縦軸がLED電力である。なお、LED電力はLED電流とLED電圧の積であるから、LED電力は図9のLED電圧と同じ形状の線で表され、環境温度に対して単調減少する。即ち、環境温度が低下すると、LED電力は上昇する。   FIG. 10 shows the environmental temperature-LED power characteristics of the LED lighting device 400. In the figure, the horizontal axis represents the environmental temperature, and the vertical axis represents the LED power. Since the LED power is the product of the LED current and the LED voltage, the LED power is represented by a line having the same shape as the LED voltage in FIG. 9 and monotonously decreases with respect to the environmental temperature. That is, when the environmental temperature decreases, the LED power increases.

図9及び図10を基に、LED点灯装置400のLED電圧−LED電流及びLED電力特性を示すと図11に示すようになる。同図では、横軸がLED電圧、左軸がLED電流、右軸がLED電力であり、LED電流が破線、LED電力が実線で示される。図9〜図11から分かるように、環境温度が低下してLED電圧が上昇すると、それに比例してLED電力が上昇する。   FIG. 11 shows the LED voltage-LED current and LED power characteristics of the LED lighting device 400 based on FIG. 9 and FIG. In the figure, the horizontal axis indicates the LED voltage, the left axis indicates the LED current, the right axis indicates the LED power, the LED current is indicated by a broken line, and the LED power is indicated by a solid line. As can be seen from FIGS. 9 to 11, when the environmental temperature decreases and the LED voltage increases, the LED power increases proportionally.

図12に、LED点灯装置400の環境温度−照度特性を示す。同図では横軸が環境温度であり、縦軸は環境温度30℃時の照度(又は光束)を100(%)とした場合の照度比である。図12から分かるように、照度は環境温度に対して単調減少する。即ち、環境温度が低下すると、照度は上昇する。   FIG. 12 shows the environmental temperature-illuminance characteristics of the LED lighting device 400. In the figure, the horizontal axis is the environmental temperature, and the vertical axis is the illuminance ratio when the illuminance (or luminous flux) at the environmental temperature of 30 ° C. is 100 (%). As can be seen from FIG. 12, the illuminance monotonously decreases with respect to the environmental temperature. That is, when the environmental temperature decreases, the illuminance increases.

図9〜図12から、LED点灯装置400について次のことがいえる。環境温度30℃でLED電圧、LED電力及び照度が所定の設定値となるように設計されたLED照明器具2の環境温度が−20℃となると、LED電圧、LED電力及び照度が各設定値に対して上昇する。本例では、環境温度30℃におけるLED電圧及びLED電力の設定値がそれぞれ100V及び50Wである場合に、環境温度−20℃では、LED電圧及びLED電力が約3%上昇して103.3V、51.7Wとなり、照度が約116%に上昇する。なお、上記の具体的数値は例示にすぎないが、上記の傾向、即ち、定電流制御の場合に温度低下に対してLED電圧及び電力が上昇する傾向及び環境温度低下に対するLED電力の上昇率よりもLED照度の上昇率が上回る傾向はLEDの種類、電流値、放熱形態、器具形状等にかかわらず同様である。   From FIG. 9 to FIG. 12, the following can be said for the LED lighting device 400. When the environmental temperature of the LED lighting device 2 designed so that the LED voltage, the LED power, and the illuminance become predetermined set values at the environmental temperature of 30 ° C., the LED voltage, the LED power, and the illuminance become the respective set values. It rises against. In this example, when the setting values of the LED voltage and the LED power at the environmental temperature of 30 ° C. are 100 V and 50 W, respectively, at the environmental temperature of −20 ° C., the LED voltage and the LED power increase by about 3% to 103.3 V, 51.7W, and the illuminance increases to about 116%. Although the above specific numerical values are merely examples, the above tendency, that is, the tendency of the LED voltage and power to increase with respect to temperature decrease in the case of constant current control, and the increase rate of LED power with respect to environmental temperature decrease. The tendency that the increase rate of the LED illuminance exceeds is the same regardless of the type of LED, current value, heat radiation form, appliance shape, and the like.

このように、LEDを定電流制御により点灯したのでは、環境温度の低下に伴い、消費電力及び照度が上昇して過剰なものとなってしまう。また、環境温度の低下に伴う照度の上昇率(本例では16%)はLED電力の上昇率(本例では3%)を上回ることから、特許文献1のようにLEDを定電力制御しても、環境温度の低下に伴って照度が上昇してしまうことが分かる。   As described above, when the LED is lit by constant current control, the power consumption and the illuminance increase as the environmental temperature decreases, which becomes excessive. In addition, the rate of increase in illuminance accompanying the decrease in ambient temperature (16% in this example) exceeds the rate of increase in LED power (3% in this example). It can also be seen that the illuminance increases as the environmental temperature decreases.

一方、本実施形態のLED点灯装置200は、環境温度の低下に対してLED電力を減少させることにより、照度の上昇を抑制するように構成される。   On the other hand, the LED lighting device 200 of the present embodiment is configured to suppress an increase in illuminance by reducing the LED power with respect to a decrease in environmental temperature.

図4に、LED点灯装置200による環境温度−LED電流及びLED電圧特性を示す。同図では、上述した図9と同様に、横軸が環境温度、左軸がLED電流、右軸がLED電圧であり、LED電流が破線、LED電圧が実線で示される。上述したように、LED点灯装置200では、電流検出抵抗230に発生する電圧V1と分圧抵抗242に発生する電圧V2の和が基準電圧源252の基準電圧Vrefで一定となるように制御される。従って、環境温度が低下してLED電圧が増加に向かうと、電圧V1に変換されるLED電流が減少するように制御が行われ、LED電流の減少に伴い、電圧V2に変換されるLED電圧の増大が抑制される。   FIG. 4 shows the environmental temperature-LED current and LED voltage characteristics of the LED lighting device 200. In this figure, as in FIG. 9 described above, the horizontal axis is the environmental temperature, the left axis is the LED current, the right axis is the LED voltage, the LED current is indicated by a broken line, and the LED voltage is indicated by a solid line. As described above, in the LED lighting device 200, the sum of the voltage V1 generated in the current detection resistor 230 and the voltage V2 generated in the voltage dividing resistor 242 is controlled to be constant at the reference voltage Vref of the reference voltage source 252. . Therefore, when the ambient temperature decreases and the LED voltage increases, control is performed so that the LED current converted to the voltage V1 decreases, and the LED voltage converted to the voltage V2 decreases as the LED current decreases. Increase is suppressed.

電圧V1の減少量に対する電圧V2の増加量の比は、電流検出抵抗230の抵抗値及び電圧検出回路240における分圧比の設定によって決定される。例えば、本実施形態では、電流検出抵抗230が0.47Ω、電圧検出回路240における分圧比は約1/440(分圧抵抗241:300kΩ、分圧抵抗242:680Ω)である。これにより、LED電流減少の変化量に対するLED電圧増加の変化量の比は約2:1に設定される。従って、環境温度30℃におけるLED電流(500mA)及びLED電圧(100V)に対して、環境温度−20℃ではLED電流の減少量が4%(20mA)となるとともにLED電圧の増加量が2%(2V)となる。なお、上記各抵抗値及び上記変化量の比は一例であり、LED点灯装置の出力設定値、LEDモジュールの構成及び特性等を考慮して他の抵抗値及び変化量の比が適用されてもよい。   The ratio of the increase amount of the voltage V2 to the decrease amount of the voltage V1 is determined by the setting of the resistance value of the current detection resistor 230 and the voltage division ratio in the voltage detection circuit 240. For example, in the present embodiment, the current detection resistor 230 is 0.47Ω, and the voltage dividing ratio in the voltage detection circuit 240 is about 1/440 (the voltage dividing resistor 241: 300 kΩ, the voltage dividing resistor 242: 680Ω). Thereby, the ratio of the change amount of the LED voltage increase to the change amount of the LED current decrease is set to about 2: 1. Therefore, with respect to the LED current (500 mA) and the LED voltage (100 V) at the environmental temperature of 30 ° C., the decrease in the LED current is 4% (20 mA) and the increase in the LED voltage is 2% at the environmental temperature of −20 ° C. (2V). Note that the ratios of the resistance values and the amount of change are examples, and other resistance values and the ratio of the amount of change may be applied in consideration of the output setting value of the LED lighting device, the configuration and characteristics of the LED module, and the like. Good.

図5に、LED点灯装置200の環境温度−LED電力特性を示す。同図では、上述した図10と同様に、横軸が環境温度、縦軸がLED電力である。LED電力はLED電流とLED電圧の積であり、環境温度の低下に伴うLED電流の減少率の絶対値がLED電圧の上昇率の絶対値を上回るので、LED電力は環境温度の低下に伴い減少する。本実施形態では、環境温度30℃におけるLED電力(50W)を1とすると、環境温度−20℃ではLED電力は約0.98(=0.96×1.02)となり、50Wから約2%減少して約49Wとなる。   FIG. 5 shows the environmental temperature-LED power characteristic of the LED lighting device 200. In this figure, as in FIG. 10 described above, the horizontal axis represents the environmental temperature, and the vertical axis represents the LED power. LED power is the product of LED current and LED voltage. Since the absolute value of the LED current decrease rate with the decrease in the environmental temperature exceeds the absolute value of the LED voltage increase rate, the LED power decreases with the decrease in the environmental temperature. To do. In this embodiment, assuming that the LED power (50 W) at the environmental temperature of 30 ° C. is 1, the LED power is about 0.98 (= 0.96 × 1.02) at the environmental temperature of −20 ° C., from about 50 W to about 2%. It decreases to about 49W.

図4及び図5を基に、LED点灯装置200のLED電圧−LED電流及びLED電力特性を示すと、図6のようになる。同図では、上述した図11と同様に、横軸がLED電圧、左軸がLED電流、右軸がLED電力であり、LED電流が破線、LED電力が実線で示される。図4〜図6から分かるように、環境温度の低下によりLED電圧が上昇すると、LED電流及びLED電力とも減少する。   FIG. 6 shows the LED voltage-LED current and LED power characteristics of the LED lighting device 200 based on FIG. 4 and FIG. In the same figure, as in FIG. 11 described above, the horizontal axis indicates the LED voltage, the left axis indicates the LED current, the right axis indicates the LED power, the LED current is indicated by a broken line, and the LED power is indicated by a solid line. As can be seen from FIGS. 4 to 6, when the LED voltage increases due to a decrease in the environmental temperature, both the LED current and the LED power decrease.

図7に、LED点灯装置200の環境温度−照度特性を示す。同図では、上述した図12と同様に、横軸が環境温度であり、縦軸は環境温度30℃時の照度(又は光束)を100(%)とした場合の照度比である。図7から分かるように、環境温度の低下に対して照度は僅かに(約2%)上昇するものの略一定となる。即ち、LED点灯装置200においては、環境温度が30℃から−20℃に低下すると、LED電流が4%減少し、LED電圧が2%上昇し、LED電力が約2%減少し、その結果として照度の上昇が約2%に抑えられる。   FIG. 7 shows the environmental temperature-illuminance characteristics of the LED lighting device 200. In this figure, as in FIG. 12 described above, the horizontal axis is the environmental temperature, and the vertical axis is the illuminance ratio when the illuminance (or light flux) at the environmental temperature of 30 ° C. is 100 (%). As can be seen from FIG. 7, the illuminance slightly increases (about 2%) as the environmental temperature decreases, but is substantially constant. That is, in the LED lighting device 200, when the environmental temperature decreases from 30 ° C. to −20 ° C., the LED current decreases by 4%, the LED voltage increases by 2%, and the LED power decreases by about 2%. The increase in illuminance is suppressed to about 2%.

このように、環境温度30℃でLED電圧、LED電力及び照度が所定の設定値となるように設計されたLED照明器具1の環境温度が−20℃となると、LED電圧は設定値から増加するものの、LED電流及びLED電力は設定値に対して減少する。その結果、環境温度低下時の照度の上昇が減殺され、環境温度30℃時に対する環境温度−20℃時の照度の上昇は約2%まで抑制される。即ち、LED点灯装置200では、環境温度の低下に対してLED電力が所定の割合で減少するように構成されているので、環境温度の低下に対する照度の過剰な上昇を抑制することができる。言い換えると、広範な使用温度において略一定の照度を得ることができ、あらゆる環境で余分な電力消費が抑制及び節約される。   Thus, when the environmental temperature of the LED lighting apparatus 1 designed so that the LED voltage, the LED power, and the illuminance have predetermined setting values at the environmental temperature of 30 ° C., the LED voltage increases from the setting value. However, the LED current and LED power decrease with respect to the set values. As a result, the increase in illuminance when the environmental temperature decreases is reduced, and the increase in illuminance at the environmental temperature −20 ° C. with respect to the environmental temperature 30 ° C. is suppressed to about 2%. That is, in the LED lighting device 200, the LED power is configured to decrease at a predetermined rate with respect to the decrease in the environmental temperature, so that an excessive increase in illuminance with respect to the decrease in the environmental temperature can be suppressed. In other words, a substantially constant illuminance can be obtained over a wide range of operating temperatures, and excess power consumption is suppressed and saved in any environment.

以上のように、本実施形態のLED点灯装置200は、LED301に直流電流を供給する直流電源回路220と、LED電流を電圧V1に変換する電流検出回路230と、LED電圧を電圧V2に変換する電圧検出回路240と、直流電源回路220の出力を制御する制御回路250を備える。制御回路250において、電圧V1と電圧V2の和が所定値Vrefで一定となるように直流電源回路220の出力が制御されるので、LED電圧の増加に対してLED電流及びLED電力を減少させることができる。これにより、LED電圧の上昇に伴う照度の上昇を抑制し、照度を略一定に保つことが可能となる。具体的には、環境温度の低下に対してLED電力が減少するように電流検出抵抗230の抵抗値及び電圧検出回路240における分圧比が決定される。例えば、環境温度の低下に対して、LED電流減少の変化量がLED電圧増加の変化量よりも大きくなるように上記抵抗値及び分圧比が決定される。これにより、環境温度の低下に対してLED電力を減少させることができ、照度の過剰な増加を抑制することができる。従って、環境温度の低下に伴う照度の過剰な上昇に起因する無駄な消費電力を節約することができる。   As described above, the LED lighting device 200 according to this embodiment includes the DC power supply circuit 220 that supplies a DC current to the LED 301, the current detection circuit 230 that converts the LED current to the voltage V1, and the LED voltage that converts the LED voltage to the voltage V2. A voltage detection circuit 240 and a control circuit 250 that controls the output of the DC power supply circuit 220 are provided. In the control circuit 250, the output of the DC power supply circuit 220 is controlled so that the sum of the voltage V1 and the voltage V2 becomes constant at the predetermined value Vref, so that the LED current and the LED power are decreased with respect to the increase of the LED voltage. Can do. Thereby, an increase in illuminance accompanying an increase in LED voltage can be suppressed, and the illuminance can be kept substantially constant. Specifically, the resistance value of the current detection resistor 230 and the voltage division ratio in the voltage detection circuit 240 are determined so that the LED power decreases with a decrease in the environmental temperature. For example, the resistance value and the voltage division ratio are determined so that the change amount of the LED current decrease is larger than the change amount of the LED voltage increase with respect to the decrease in the environmental temperature. Thereby, LED electric power can be reduced with respect to the fall of environmental temperature, and the excessive increase in illumination intensity can be suppressed. Therefore, useless power consumption due to an excessive increase in illuminance accompanying a decrease in environmental temperature can be saved.

<変形例>
なお、上記において本発明の最も好適な実施形態を示したが、本発明は上記構成に限られず、種々の変形が可能である。
<Modification>
Although the most preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described configuration, and various modifications can be made.

(1)電圧検出回路の変形
上記実施形態では、環境温度の低下に対する照度の上昇が抑制されるものの、それでも照度の僅かな上昇(約2%の上昇)が見られる。また、電流検出抵抗230の抵抗値及び電圧検出回路240における分圧比の設定によっては、環境温度低下に対する(即ち、LED電圧の上昇に対する)LED電力の減少が過大となり、それにより環境温度低下時に照度が僅かに低下する可能性がある。そこで、本変形例では、このような環境温度低下時の照度の僅かな上昇又は低下をさらに微調整又は補償する構成が設けられる。
(1) Modification of Voltage Detection Circuit In the above embodiment, although an increase in illuminance with respect to a decrease in environmental temperature is suppressed, there is still a slight increase in illuminance (an increase of about 2%). Further, depending on the setting of the resistance value of the current detection resistor 230 and the voltage division ratio in the voltage detection circuit 240, the decrease in the LED power with respect to the environmental temperature decrease (that is, with respect to the increase in the LED voltage) becomes excessive. May decrease slightly. Therefore, in the present modification, a configuration for further finely adjusting or compensating for such a slight increase or decrease in illuminance when the environmental temperature decreases is provided.

具体的には、本変形例では、電圧検出回路240の分圧抵抗に感温抵抗素子が接続される。例えば、環境温度低下時の照度の僅かな上昇を補償するために、図13に示すように、高電位側の分圧抵抗241が固定抵抗素子241aと正の温度係数を有する抵抗素子(PTCサーミスタ)241bの直列回路からなる構成としてもよい。PCTサーミスタ241bは温度低下に伴い抵抗値が減少する。従って、低温下において上記電圧V2がより増加するので、制御回路250のフィードバック制御により直流電源回路220の出力はさらに低減される。これにより、環境温度の低下に対するLED電力の減少量をより大きくして、環境温度の低下に対する照度の上昇をより抑制することができる。あるいは、低電位側の分圧抵抗242が固定抵抗素子と負の温度係数を有する抵抗素子(NTCサーミスタ)の直列回路からなる構成としてもよい。NCTサーミスタは低温下において抵抗値が増加するので、高電位側の分圧抵抗241にPCTサーミスタを使用する場合と同様の効果を得ることができる。このように、感温抵抗素子を電圧検出回路240に接続することにより、電圧V1と電圧V2の変化量の比をより厳密に決定することができ、環境温度に対する照度の変化をさらに抑制することが可能となる。   Specifically, in this modification, a temperature-sensitive resistance element is connected to the voltage dividing resistor of the voltage detection circuit 240. For example, in order to compensate for a slight increase in illuminance when the environmental temperature decreases, as shown in FIG. 13, the high-voltage side voltage dividing resistor 241 has a resistance element (PTC thermistor) having a positive temperature coefficient with the fixed resistance element 241a. ) It may be configured by a series circuit of 241b. The resistance value of the PCT thermistor 241b decreases as the temperature decreases. Accordingly, since the voltage V2 further increases at low temperatures, the output of the DC power supply circuit 220 is further reduced by the feedback control of the control circuit 250. Thereby, the reduction amount of LED electric power with respect to the fall of environmental temperature can be enlarged more, and the raise of the illumination intensity with respect to the fall of environmental temperature can be suppressed more. Alternatively, the voltage dividing resistor 242 on the low potential side may be configured by a series circuit of a fixed resistance element and a resistance element (NTC thermistor) having a negative temperature coefficient. Since the resistance value of the NCT thermistor increases at a low temperature, the same effect as when the PCT thermistor is used for the voltage dividing resistor 241 on the high potential side can be obtained. Thus, by connecting the temperature sensitive resistance element to the voltage detection circuit 240, the ratio of the amount of change between the voltage V1 and the voltage V2 can be determined more strictly, and the change in illuminance with respect to the environmental temperature is further suppressed. Is possible.

また、図2の回路において環境温度低下時のLED電力の減少が過大で照度が僅かに低下する場合には、その補償においては、上記と逆の態様で感温抵抗素子が接続されるようにすればよい。即ち、この場合、高電位側の分圧抵抗241が固定抵抗素子とNTCサーミスタの直列回路からなる構成、又は低電位側の分圧抵抗242が固定抵抗素子とPTCサーミスタの直列回路からなる構成が採用される。もちろん、PTCサーミスタ又はNTCサーミスタが分圧抵抗241又は242の全体又は一部に並列接続される構成としてもよい。   Further, in the circuit of FIG. 2, when the decrease in the LED power at the time of the environmental temperature drop is excessive and the illuminance is slightly reduced, the compensation is made so that the temperature-sensitive resistance element is connected in the opposite manner to the above. do it. That is, in this case, the high potential side voltage dividing resistor 241 is configured by a series circuit of a fixed resistance element and an NTC thermistor, or the low potential side voltage dividing resistor 242 is configured by a series circuit of a fixed resistance element and a PTC thermistor. Adopted. Of course, a PTC thermistor or NTC thermistor may be connected in parallel to the whole or a part of the voltage dividing resistor 241 or 242.

(2)直流電源回路のコンバータ方式の変形
上記実施形態では、直流電源回路220が絶縁型フライバック回路からなる構成を示したが、直流電力を出力することができれば他の方式のコンバータ回路からなるものであってもよい。例えば、絶縁型フライバック回路の前段に力率改善回路(昇圧チョッパ回路)を設け、フライバック回路には降圧機能のみを持たせる構成としてもよいし、絶縁型フライバック回路の代わりに非絶縁型の降圧チョッパ回路を用いる構成としてもよい。また、上記実施形態では直流電源回路に交流電圧が入力される構成を示したが、バッテリ等の直流電圧が入力される構成にも本発明は適用可能である。この場合、入力回路210の特に整流回路213は不要となり、直流電源回路220はDC/DCコンバータとなる。
(2) Modification of converter system of DC power supply circuit In the above embodiment, the DC power supply circuit 220 is constituted by an insulation type flyback circuit. However, if DC power can be output, it is constituted by a converter circuit of another system. It may be a thing. For example, a power factor correction circuit (boost chopper circuit) may be provided in front of the isolated flyback circuit, and the flyback circuit may have only a step-down function, or a non-insulated type instead of the isolated flyback circuit. The step-down chopper circuit may be used. Moreover, although the configuration in which an AC voltage is input to the DC power supply circuit is shown in the above embodiment, the present invention can also be applied to a configuration in which a DC voltage such as a battery is input. In this case, the rectifier circuit 213 of the input circuit 210 is not necessary, and the DC power supply circuit 220 is a DC / DC converter.

(3)LED照明器具の用途の変更
上記実施形態では、広い温度範囲で使用され得るLED照明器具1として屋外防犯灯を例示したが、LED照明器具1の用途は防犯灯に限られず、街路灯、道路灯等にも適用できる。また、LED照明器具1の用途は屋外用照明に限られない。例えば、屋内用照明においても、設置場所によって環境温度が大きく異なり得る場合に本発明の適用が有用なものとなる。例えば、常温付近で使用されるだけでなく冷凍倉庫内、冷凍用ショーケース内等に設置され得るLED照明器具に本発明の適用が有用なものとなる。
(3) Change of use of LED lighting fixture In the above-described embodiment, an outdoor security light is exemplified as the LED lighting fixture 1 that can be used in a wide temperature range. However, the use of the LED lighting fixture 1 is not limited to a security light, and a street light. It can also be applied to road lights. Moreover, the use of the LED lighting apparatus 1 is not limited to outdoor lighting. For example, even in indoor lighting, the application of the present invention is useful when the environmental temperature can vary greatly depending on the installation location. For example, the application of the present invention is useful for LED lighting fixtures that can be used not only near room temperature but also installed in a freezing warehouse, a freezing showcase, and the like.

1 LED照明器具
100 ケース
200 LED点灯装置
220 直流電源回路
230 電流検出回路(電流検出抵抗)
240 電圧検出回路
241、242 分圧抵抗
250 制御回路
300 LEDモジュール
301 LED
DESCRIPTION OF SYMBOLS 1 LED lighting fixture 100 Case 200 LED lighting device 220 DC power supply circuit 230 Current detection circuit (current detection resistance)
240 Voltage detection circuit 241, 242 Voltage dividing resistor 250 Control circuit 300 LED module 301 LED

Claims (5)

LED点灯装置であって、
LEDに直流電流を供給する直流電源回路と、
前記LEDに流れるLED電流を第1の変換率で第1の電圧に変換する電流検出回路と、
前記LEDに印加されるLED電圧を第2の変換率で第2の電圧に変換する電圧検出回路と、
前記第1の電圧と前記第2の電圧の和が所定値で一定となるように前記直流電源回路の出力を制御する制御回路と
を備えたLED点灯装置。
An LED lighting device,
A DC power supply circuit for supplying a direct current to the LED;
A current detection circuit for converting the LED current flowing through the LED into a first voltage at a first conversion rate;
A voltage detection circuit that converts the LED voltage applied to the LED to a second voltage at a second conversion rate;
An LED lighting device comprising: a control circuit that controls an output of the DC power supply circuit so that a sum of the first voltage and the second voltage is constant at a predetermined value.
請求項1に記載のLED点灯装置において、前記LEDの環境温度の低下に対して前記LED電流と前記LED電圧の積が減少するように前記第1の変換率及び前記第2の変換率が決定されたLED点灯装置。   2. The LED lighting device according to claim 1, wherein the first conversion rate and the second conversion rate are determined so that a product of the LED current and the LED voltage decreases with respect to a decrease in environmental temperature of the LED. LED lighting device. 請求項2に記載のLED点灯装置において、前記LEDの環境温度の低下に対して、前記LED電流減少の変化量が前記LED電圧増加の変化量よりも大きくなるように前記第1の変換率及び前記第2の変換率が決定されたLED点灯装置。   3. The LED lighting device according to claim 2, wherein the first conversion rate and the change rate of the LED current decrease are larger than the change amount of the LED voltage increase with respect to a decrease in the environmental temperature of the LED. The LED lighting device in which the second conversion rate is determined. 請求項1から3のいずれか一項に記載のLED点灯装置であって、さらに高電位側出力端子及び低電位側出力端子を有し、
前記直流電源回路が高電位側出力ノード及び低電位側出力ノードを有し、該高電位側出力ノードが前記高電位側出力端子に接続され、
前記電流検出回路が、前記低電位側出力ノードと前記低電位側出力端子の間に接続された電流検出抵抗からなり、
前記電圧検出回路が、前記高電位側出力端子と前記低電位側出力端子の間に接続された高電位側の第1の抵抗及び低電位側の第2の抵抗の直列回路からなり、
前記第1の電圧が前記電流検出抵抗に発生する電圧であり、前記第2の電圧が前記第2の抵抗に発生する電圧である、LED点灯装置。
The LED lighting device according to any one of claims 1 to 3, further comprising a high potential side output terminal and a low potential side output terminal,
The DC power supply circuit has a high potential side output node and a low potential side output node, and the high potential side output node is connected to the high potential side output terminal,
The current detection circuit comprises a current detection resistor connected between the low potential side output node and the low potential side output terminal;
The voltage detection circuit comprises a series circuit of a first resistor on the high potential side and a second resistor on the low potential side connected between the high potential side output terminal and the low potential side output terminal;
The LED lighting device, wherein the first voltage is a voltage generated in the current detection resistor, and the second voltage is a voltage generated in the second resistor.
請求項1から4のいずれか一項に記載のLED点灯装置と、
前記LEDが実装されたLEDモジュールと、
前記LED点灯装置及び前記LEDモジュールを内包するケースと
を備えたLED照明器具。
LED lighting device according to any one of claims 1 to 4,
An LED module on which the LED is mounted;
An LED lighting apparatus comprising the LED lighting device and a case containing the LED module.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109561551A (en) * 2018-11-15 2019-04-02 欧普照明股份有限公司 A kind of system and method identifying product information
WO2020017492A1 (en) * 2018-07-19 2020-01-23 株式会社小糸製作所 Lighting circuit and vehicular light fitting

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009231147A (en) * 2008-03-24 2009-10-08 Toshiba Lighting & Technology Corp Power supply device and luminaire
JP2011181515A (en) * 2006-01-24 2011-09-15 Samsung Electro-Mechanics Co Ltd Led driving device with temperature compensation function
JP2011249052A (en) * 2010-05-24 2011-12-08 Panasonic Electric Works Co Ltd Luminaire and guide light

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011181515A (en) * 2006-01-24 2011-09-15 Samsung Electro-Mechanics Co Ltd Led driving device with temperature compensation function
JP2009231147A (en) * 2008-03-24 2009-10-08 Toshiba Lighting & Technology Corp Power supply device and luminaire
JP2011249052A (en) * 2010-05-24 2011-12-08 Panasonic Electric Works Co Ltd Luminaire and guide light

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020017492A1 (en) * 2018-07-19 2020-01-23 株式会社小糸製作所 Lighting circuit and vehicular light fitting
CN112385316A (en) * 2018-07-19 2021-02-19 株式会社小糸制作所 Lighting circuit and vehicle lamp
US11197356B2 (en) 2018-07-19 2021-12-07 Koito Manufaciuring Co., Ltd. Lighting circuit and vehicle lamp
CN112385316B (en) * 2018-07-19 2023-06-02 株式会社小糸制作所 Lighting circuit and vehicle lamp
CN109561551A (en) * 2018-11-15 2019-04-02 欧普照明股份有限公司 A kind of system and method identifying product information
WO2020098759A1 (en) * 2018-11-15 2020-05-22 欧普照明股份有限公司 System and method for identifying product information
US11971435B2 (en) 2018-11-15 2024-04-30 Opple Lighting Co., Ltd. System and method for identifying product information

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