JP2006172820A - Led lighting control device - Google Patents

Led lighting control device Download PDF

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JP2006172820A
JP2006172820A JP2004361495A JP2004361495A JP2006172820A JP 2006172820 A JP2006172820 A JP 2006172820A JP 2004361495 A JP2004361495 A JP 2004361495A JP 2004361495 A JP2004361495 A JP 2004361495A JP 2006172820 A JP2006172820 A JP 2006172820A
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dimming
voltage
leds
led
lighting control
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JP4416636B2 (en
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Masakazu Yoshida
正和 吉田
Manabu Fukui
学 福井
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Seiwa Electric Mfg Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To achieve lighting control in which all the LEDs are operated without any problem even if the control for dimming light control brightness to 15% of the maximum brightness is carried out. <P>SOLUTION: In a lighting control device in which a plurality of serially-connected LEDs are lighted by using an AC voltage from an AC power source, and by installing a zero-cross detecting part which detects a zero-cross point of an AC voltage waveform and a dimming control part which controls the dimming of an LED group, by obtaining a wave height point of the AC voltage waveform from the AC power source, and by carrying out the pulse width modulation of the voltage (PMW control synchronized with power source frequency) which is supplied to the LED group because its wave height point Pp is taken as the reference, the voltage supplied to the LED group is prevented from being the voltage Vf or less in which the LED group of serial-connection is operable even if the light control brightness is reduced to 15% of the maximum brightness. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、例えばLED式信号灯器など、複数のLEDを光源とする発光・表示装置に適用されるLED点灯制御装置に関する。   The present invention relates to an LED lighting control device applied to a light emitting / display device using a plurality of LEDs as a light source, such as an LED signal lamp.

道路等に設置される3色信号灯器としては、従来、白熱電球(光源)と、この白熱電球の背面側に配置される反射板と、白熱電球の前面側に配置される前面カバーとからなり、その前面カバーに赤・青・黄の信号色を着色した構造のものが使用されている。   Conventionally, a three-color signal lamp installed on a road or the like is composed of an incandescent bulb (light source), a reflector arranged on the back side of the incandescent bulb, and a front cover arranged on the front side of the incandescent bulb. The front cover has a structure in which red, blue and yellow signal colors are colored.

また、最近では、消費電力の低減化や保守・管理に要する手間の削減等をはかることを目的として、LED(発光ダイオード)式信号灯器が実用化されてきている(例えば、特許文献1参照)。   In recent years, LED (light emitting diode) type signal lamps have been put into practical use for the purpose of reducing power consumption and maintenance / management efforts (see, for example, Patent Document 1). .

LED式信号灯器は、多数のLED(発光色:赤、青または黄)がLED基板に実装されてなるLEDユニットを光源とし、そのLEDユニットを灯器ケース内に収容し、LED群の前面側を透明の前面レンズカバーで覆った構造となっている。また、LEDユニットを光源に用いた信号灯器としては、3色信号灯器のほか、例えば道路の分岐点・曲線部などに設置し運転者に注意を喚起するのに使用されるLED式点滅灯なども実用化されている。   The LED signal lamp uses a LED unit in which a large number of LEDs (light emission color: red, blue, or yellow) are mounted on an LED substrate as a light source. The LED unit is housed in a lamp case and the front side of the LED group. Is covered with a transparent front lens cover. Moreover, as a signal lamp using an LED unit as a light source, in addition to a three-color signal lamp, for example, an LED flashing lamp that is installed at a branching point or a curved part of a road and used to call a driver's attention Has also been put to practical use.

LED式信号灯器やLED式点滅灯等においては、昼間輝度(最大輝度)に対して輝度を落とした調光制御が行われる場合がある。LED群に適用される調光制御としては、交流電源からの交流電圧を用いてLED群の点灯を行う場合、例えば図6に示すように、調光レベルに応じて点弧(位相角)φをMまたはNの方向にずらすことにより、LED群に供給する電圧を制御するという位相制御が適用されている(例えば、特許文献2参照)。
特開2000−67386号公報 特開2004−273267号公報
In LED signal lamps, LED flashing lights, and the like, dimming control may be performed in which the luminance is reduced with respect to daytime luminance (maximum luminance). As dimming control applied to the LED group, when the LED group is turned on using an AC voltage from an AC power source, for example, as shown in FIG. Phase control of controlling the voltage supplied to the LED group by shifting in the direction of M or N is applied (see, for example, Patent Document 2).
JP 2000-67386 A JP 2004-273267 A

ところで、LEDを位相制御により調光する場合、以下のような問題がある。   By the way, when dimming LED by phase control, there exist the following problems.

まず、LEDは、交流電源などから供給される電圧が動作開始電圧よりも低くなると、電流が流れなくなって点灯(動作)が不可となるという特性があり、このため動作開始電圧以上で使用する必要がある。   First, the LED has a characteristic that when the voltage supplied from an AC power supply or the like becomes lower than the operation start voltage, the current stops flowing and the lighting (operation) becomes impossible. Therefore, it is necessary to use the LED above the operation start voltage. There is.

一方、LED式信号灯器やLED式点滅灯等には多数のLEDが直列接続され、その直列接続の複数列のLED群が並列接続されている。例えば、点滅灯の黄信号灯器では、並列接続された複数列のLED群の1列に32個のLED(例えば動作開始電圧=2.0V)が直列接続されており、1列の全てのLEDを点灯するのに必要な電圧Vfは64V(Vf=2.0V×32個)となる。なお、交通信号灯器などの青信号灯器では、1列に24個のLED(例えば動作保証電圧=3.0V)が直列接続されており、1列の全てのLEDを点灯するのに必要な電圧Vfは72V(Vf=3.0V×24個)となる。   On the other hand, a large number of LEDs are connected in series to an LED signal lamp, an LED flashing lamp, and the like, and a plurality of LED groups connected in series are connected in parallel. For example, in a flashing yellow signal lamp, 32 LEDs (for example, operation start voltage = 2.0 V) are connected in series to one row of a plurality of LED groups connected in parallel, and all LEDs in one row are connected. The voltage Vf required to light up is 64V (Vf = 2.0V × 32). In addition, in a green signal lamp such as a traffic signal lamp, 24 LEDs (for example, operation guarantee voltage = 3.0 V) are connected in series in one row, and the voltage required to light all the LEDs in one row. Vf is 72V (Vf = 3.0V × 24).

そして、点滅灯等では、夜間輝度を昼間輝度(最大輝度)の15%に調光することが行われており、上記した一般的な位相制御による調光方式では、図7に示すように、直列接続されたLED群に印加する電圧の大部分が、点灯に必要なVf(絶対値)を下回る場合があり、全てのLEDが点灯しなくなるという問題がある。。   Then, in the flashing lamp or the like, the nighttime luminance is adjusted to 15% of the daytime luminance (maximum luminance), and in the dimming method based on the general phase control described above, as shown in FIG. There is a case where most of the voltage applied to the LED group connected in series is lower than Vf (absolute value) necessary for lighting, and there is a problem that all the LEDs do not light up. .

本発明は、そのような問題を解消するためになされたもので、直列接続されたLED群を交流電源にて点灯するにあたり、調光輝度を最大輝度の15%まで調光する制御を行っても、全てのLEDが問題なく動作する調光制御を実現することが可能なLED点灯制御装置の提供を目的とする。   The present invention has been made in order to solve such a problem. In order to light up a group of LEDs connected in series with an AC power supply, the dimming brightness is controlled to 15% of the maximum brightness. Another object is to provide an LED lighting control device capable of realizing dimming control in which all LEDs operate without problems.

本発明の点灯制御装置は、直列接続された複数のLEDを交流電源からの交流電圧を用いて点灯する点灯制御装置であって、交流電圧波形のゼロクロス点を検出するゼロクロス検出部と、前記複数のLEDの調光を制御する調光制御部とを備え、前記調光制御部は、前記ゼロクロス検出部にて検出されたゼロクロス点に基づいて交流電圧波形の波高点を求め、その波高点を基準として前記複数のLEDに供給する電圧のパルス幅を変調するように構成されていることによって特徴づけられる。   The lighting control device of the present invention is a lighting control device that lights a plurality of LEDs connected in series using an AC voltage from an AC power supply, and detects a zero-cross point of an AC voltage waveform, and the plurality of LEDs A dimming control unit that controls dimming of the LED, and the dimming control unit obtains a crest point of the AC voltage waveform based on the zero cross point detected by the zero cross detection unit, and determines the crest point. It is characterized by being configured to modulate the pulse width of the voltage supplied to the plurality of LEDs as a reference.

なお、波高点とは、交流電圧波形の半サイクルにおいて電圧(絶対値)が最大値(波高値)となるポイント(位相角)Pp(図4参照)のことである。   The crest point is a point (phase angle) Pp (see FIG. 4) at which the voltage (absolute value) becomes the maximum value (crest value) in a half cycle of the AC voltage waveform.

本発明の点灯制御装置によれば、交流電源からの交流電圧波形の波高点を求め、その波高点を基準として複数のLEDに供給する電圧のパルス幅変調(電源周波数に同期したPWM制御)を行っているので、例えば図5に示すように、電圧のパルス幅PMを細く絞ってもLED群に供給する電圧が、点灯に必要なVfを下回ることがなく、全てのLEDが問題なく動作(点灯)するようになる。   According to the lighting control device of the present invention, the peak point of the AC voltage waveform from the AC power source is obtained, and the pulse width modulation (PWM control synchronized with the power source frequency) of the voltage supplied to the plurality of LEDs with the peak point as a reference. As shown in FIG. 5, for example, even if the pulse width PM of the voltage is narrowed down, the voltage supplied to the LED group does not fall below Vf required for lighting, and all LEDs operate without any problem ( Light up).

本発明の点灯制御装置において、複数のLEDが設置される場所の周囲の明るさ(照度)を検出する照度センサを設け、この照度センサの検出出力に基づいて調光レベルを決定し、その調光レベルに応じて前記複数のLEDに供給する電圧のパルス幅を変調するように構成してもよい。このような構成を採用すると、昼間輝度(最大輝度)から夜間輝度(昼間輝度の15%)までの調光範囲において、周囲の明るさに応じた輝度調光を、例えば5段階の調光レベルで自動的に行うことが可能になる。   In the lighting control device of the present invention, an illuminance sensor that detects the brightness (illuminance) around a place where a plurality of LEDs are installed is provided, and the dimming level is determined based on the detection output of the illuminance sensor. You may comprise so that the pulse width of the voltage supplied to these LED may be modulated according to a light level. When such a configuration is adopted, in the dimming range from daytime luminance (maximum luminance) to nighttime luminance (15% of daytime luminance), luminance dimming according to the surrounding brightness is performed, for example, in five levels of dimming levels. Can be done automatically.

本発明の点灯制御装置によれば、交流電源からの交流電圧波形の波高点を求め、その波高点を基準として複数のLEDに供給する電圧のパルス幅を変調する制御(PWM制御)を実行するので、調光輝度を最大輝度の15%まで調光する制御を行っても、全てのLEDが問題なく動作する。また、基本的には、交流電圧波形の位相制御により輝度調光を行うという方式を採用しているので、調光用トランスを用いることなく輝度の調整を行うことができる。   According to the lighting control device of the present invention, a peak point of an AC voltage waveform from an AC power source is obtained, and control (PWM control) is performed to modulate the pulse width of the voltage supplied to a plurality of LEDs with the peak point as a reference. Therefore, even if the dimming brightness is controlled to 15% of the maximum brightness, all the LEDs operate without any problem. In addition, basically, since a method of performing luminance dimming by phase control of the AC voltage waveform is adopted, it is possible to adjust luminance without using a dimming transformer.

以下、本発明の実施形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

−LED式灯器−
まず、本発明を適用するLED式灯器について図1を参照しながら説明する。
-LED lamp-
First, an LED type lamp to which the present invention is applied will be described with reference to FIG.

図1(A)及び(B)に示すLED式灯器10は、道路の分岐点・曲線部などに設置し運転者に注意を喚起するのに使用されるLED式点滅灯であって、2つの発光部(黄色)11,11を備えている。これら2つの発光部11,11はLED式灯器10の上下方向に配列されている。また、LED式灯器10には各発光部11,11の前方側の上方領域を覆うフード(庇)16,16が設けられている。   An LED-type lamp 10 shown in FIGS. 1A and 1B is an LED-type flashing lamp that is installed at a branching point / curve portion of a road and used to call a driver's attention. Two light emitting portions (yellow) 11 and 11 are provided. These two light emitting units 11 and 11 are arranged in the vertical direction of the LED lamp 10. In addition, the LED lamp 10 is provided with hoods 16, 16 that cover the upper area on the front side of the light emitting units 11, 11.

各発光部11,11は、それぞれ、多数のLED(発光色:黄色)13・・13がLED基板14に実装されてなるLEDユニット12,12(図2参照)を光源としている。その各LEDユニット12,12がそれぞれ灯器ケース10a,10a内に収容されている。また、各色のLEDユニット12のLED13・・13の前面側はそれぞれ前面レンズカバー15で覆われている。なお、各LEDユニット12は発光色が黄色であるLED13・・13が図2に示すようなドット配列で実装されている。   Each of the light emitting units 11 and 11 uses LED units 12 and 12 (see FIG. 2) in which a large number of LEDs (light emitting color: yellow) 13 and 13 are mounted on the LED substrate 14 as light sources. The LED units 12 and 12 are accommodated in lamp cases 10a and 10a, respectively. In addition, the front side of the LEDs 13... 13 of the LED units 12 of the respective colors is covered with a front lens cover 15. Each LED unit 12 has LEDs 13... 13 whose emission color is yellow mounted in a dot arrangement as shown in FIG.

そして、発光部11のLEDユニット12を構成する多数のLED13・・13は、図3に示すように、所定個数(例えば32個)のLED13・・13が直列接続され、さらにそれら直列接続されたLED13群が並列に接続されており、これらLED13・・13の点灯制御を行う点灯制御装置1がLED基板14の裏面側に配置されている(図1参照)。   Then, as shown in FIG. 3, a large number of LEDs 13... 13 constituting the LED unit 12 of the light emitting unit 11 are connected in series with a predetermined number (for example, 32) of LEDs 13. The LED 13 group is connected in parallel, and the lighting control device 1 that controls the lighting of the LEDs 13... 13 is disposed on the back side of the LED substrate 14 (see FIG. 1).

−点灯制御装置−
次に、点灯制御装置1について図3〜図5を参照しながら説明する。
-Lighting control device-
Next, the lighting control device 1 will be described with reference to FIGS.

この例の点灯制御装置1は、調光回路2及び点滅回路3などを備えており、調光回路2にAC100Vの交流電源5が接続される。また、調光回路2には周囲の明るさ(照度)を検出する照度センサ(例えばCdSセル)4が接続される。   The lighting control device 1 of this example includes a dimming circuit 2, a blinking circuit 3, and the like, and an AC power supply 5 of AC 100V is connected to the dimming circuit 2. The dimming circuit 2 is connected to an illuminance sensor (for example, a CdS cell) 4 that detects ambient brightness (illuminance).

点滅回路3は、各LEDユニット12,12を交互にオン/オフ(例えば60回/min)するための点滅信号を調光回路2(調光制御部22)に供給する。   The flashing circuit 3 supplies a flashing signal for alternately turning on / off the LED units 12 and 12 (for example, 60 times / min) to the dimming circuit 2 (the dimming control unit 22).

調光回路2は、ゼロクロス検出部21及び調光制御部22を備えている。   The dimming circuit 2 includes a zero cross detection unit 21 and a dimming control unit 22.

ゼロクロス検出部21は、交流電源5からの交流電圧波形のゼロクロス点を検出し、その検出信号を調光制御部22に出力する。   The zero cross detection unit 21 detects the zero cross point of the AC voltage waveform from the AC power supply 5 and outputs the detection signal to the dimming control unit 22.

調光制御部22は、MPU(Micro Processor Unit)、遅延回路及びメモリなどによって構成されており、以下に説明する調光レベル設定、及び、電源周波数に同期したPWM制御などの処理を実行する。   The dimming control unit 22 is configured by an MPU (Micro Processor Unit), a delay circuit, a memory, and the like, and executes processing such as dimming level setting and PWM control synchronized with the power supply frequency described below.

<調光レベル設定>
調光制御部22は照度センサ4からの照度検出値を用いて調光レベルを決定する。具体的には、照度センサ4による照度検出値と調光レベルとの関係を示すテーブルが調光制御部22のメモリに予め記憶されており、照度センサ4からの照度検出値をテーブルで参照して変換することによって調光レベルを決定する。この例では、昼間輝度(最大輝度)から夜間輝度(昼間輝度の15%)を調光範囲としており、その範囲内に例えば5段階の調光レベルを設定している。
<Dimming level setting>
The dimming control unit 22 determines the dimming level using the detected illuminance value from the illuminance sensor 4. Specifically, a table showing the relationship between the illuminance detection value by the illuminance sensor 4 and the dimming level is stored in the memory of the dimming control unit 22 in advance, and the illuminance detection value from the illuminance sensor 4 is referred to by the table. The dimming level is determined by conversion. In this example, the dimming range is from daytime luminance (maximum luminance) to nighttime luminance (15% of daytime luminance), and, for example, five levels of dimming levels are set within the range.

<電源周波数に同期したPWM制御>
調光制御部22は下記の(1)〜(3)の動作によって電源周波数に同期したPWM制御を行う。
<PWM control synchronized with power supply frequency>
The dimming control unit 22 performs PWM control synchronized with the power supply frequency by the following operations (1) to (3).

(1)図4に示すように、交流電源5からの交流電圧波形のゼロクロス点Cpをゼロクロス検出部21にて検出し、その検出されたゼロクロス点Cpに基づいて交流電源5からの交流電圧波形の波高点Ppを求める。ここで、交流電源5が60Hzである場合、周期Tは既知:T=16.7msec(50Hzの場合はT=20msec)であるので、ゼロクロス点Cpを検出し、そのゼロクロス点CpからT/4だけずれた位置(位相角)を算出することにより、波高点Ppを求めることができる。   (1) As shown in FIG. 4, the zero cross point Cp of the AC voltage waveform from the AC power supply 5 is detected by the zero cross detection unit 21, and the AC voltage waveform from the AC power supply 5 is based on the detected zero cross point Cp. Is obtained. Here, when the AC power supply 5 is 60 Hz, the period T is known: T = 16.7 msec (T = 20 msec in the case of 50 Hz), so the zero cross point Cp is detected, and from the zero cross point Cp to T / 4 The peak point Pp can be obtained by calculating a position (phase angle) shifted by a certain amount.

(2)求めた波高点Ppを基準(中心)として上記した調光レベルに応じた電圧のパルス幅つまり図4に示すオン時間[tw1+tw2]を決定する。なお、tw1とtw2とは同じ値であってもよいし、いずれか一方を他方に対して大きな値としてもよい。   (2) The pulse width of the voltage corresponding to the dimming level described above, that is, the on-time [tw1 + tw2] shown in FIG. 4 is determined using the obtained peak point Pp as a reference (center). Note that tw1 and tw2 may be the same value, or one of them may be a larger value than the other.

(3)求めたオン時間[tw1+tw2]に基づいて、ゼロクロス点Cpに対するオン遅延値tdon、及び、オフ遅延値tdoffを決定し、それらオン遅延値tdon及びオフ遅延値tdoffに基づいてLED13・・13に供給する電圧のパルス幅PWを設定する。このように、LED13・・13に供給する電圧のパルス幅PWは、波高点Ppを基準として求めたオン遅延値tdon及びオフ遅延値tdoffによって設定されるので、それらオン遅延値tdon及びオフ遅延値tdoffを図4の矢印の方向に変更することにより、上記した調光レベルに応じたパルス幅PWの電圧をLED13・・13に供給することができ、照度センサ4の照度検出値に基づく調光レベルに応じた調光が可能となる。   (3) On-delay value tdon and off-delay value tdoff for the zero-cross point Cp are determined based on the obtained on-time [tw1 + tw2], and the LEDs 13... 13 based on the on-delay value tdon and the off-delay value tdoff The pulse width PW of the voltage supplied to is set. Thus, the pulse width PW of the voltage supplied to the LEDs 13,... 13 is set by the on-delay value tdon and the off-delay value tdoff obtained with reference to the crest point Pp, so that the on-delay value tdon and the off-delay value By changing tdoff in the direction of the arrow in FIG. 4, the voltage with the pulse width PW according to the dimming level can be supplied to the LEDs 13... 13 and dimming based on the detected illuminance value of the illuminance sensor 4. Dimming according to the level becomes possible.

ここで、点灯制御装置1は、図示はしないが、全波整流回路を備えており、以上の交流電圧波形の位相制御(PWM制御)の後に全波整流を行ってLED13・・13に電圧を供給する。   Here, although not illustrated, the lighting control device 1 includes a full-wave rectification circuit, and performs full-wave rectification after the above-described phase control (PWM control) of the AC voltage waveform to supply a voltage to the LEDs 13. Supply.

なお、調光制御部22は、上記した調光制御を実行すると同時に、点滅回路3からの点滅信号に応じて各LEDユニット12,12を交互にオン/オフする制御を実行する。   The dimming control unit 22 executes the dimming control described above, and at the same time, executes a control for alternately turning on / off the LED units 12 and 12 according to the blinking signal from the blinking circuit 3.

以上のように、この例の点灯制御装置1によれば、昼間輝度(最大輝度)から夜間輝度(昼間輝度の15%)までの範囲の調光が可能である。しかも、交流電源5からの交流電圧波形の波高点Ppを求め、その波高点Ppを基準としてLED13・・13に供給する電圧のパルス幅変調(電源周波数に同期したPWM制御)を行っているので、調光輝度を15%まで落とした場合であっても、LEDユニット12内の全てのLED13が問題なく動作する。その理由を以下に説明する。   As described above, according to the lighting control device 1 of this example, dimming in a range from daytime luminance (maximum luminance) to nighttime luminance (15% of daytime luminance) is possible. Moreover, the peak point Pp of the AC voltage waveform from the AC power source 5 is obtained, and pulse width modulation (PWM control synchronized with the power source frequency) of the voltage supplied to the LEDs 13. Even if the dimming brightness is reduced to 15%, all the LEDs 13 in the LED unit 12 operate without any problem. The reason will be described below.

まず、上述したように、LEDは交流電源などから供給される電圧が動作開始電圧よりも低くなると、電流が流れなくなって点灯が不可となるという特性がある。黄色のLEDの動作開始電圧は2.0V程度である。   First, as described above, when the voltage supplied from an AC power supply or the like is lower than the operation start voltage, the LED has a characteristic that current does not flow and lighting cannot be performed. The operation start voltage of the yellow LED is about 2.0V.

この例においては、LEDユニット12を構成する多数のLED13・・13が、1列に32個が直列接続されており、1列の全てのLED13・・13を点灯するのに必要な電圧Vfは64V(Vf=2.0V×32個)となるが、上記したように交流電圧波形の波高点Ppを基準としてLED13・・13に供給する電圧のパルス幅PWを変調するので、図5に示すように、15%調光に対応するパルス幅PMの変調を行っても、LED13・・13に供給する電圧が電圧Vfを下回ることがなくなり、全てのLED13・・13の動作するようになる。従って、昼間輝度(最大輝度)から夜間輝度(昼間輝度の15%)までの範囲の調光を安定かつ確実に実現することができる。   In this example, a large number of LEDs 13... 13 constituting the LED unit 12 are connected in series in 32 rows, and the voltage Vf required to light all the LEDs 13. Although it is 64 V (Vf = 2.0 V × 32), as described above, the pulse width PW of the voltage supplied to the LEDs 13... 13 is modulated using the peak point Pp of the AC voltage waveform as a reference. Thus, even if the pulse width PM corresponding to 15% dimming is modulated, the voltage supplied to the LEDs 13... 13 does not fall below the voltage Vf, and all the LEDs 13. Accordingly, it is possible to stably and reliably realize dimming in a range from daytime luminance (maximum luminance) to nighttime luminance (15% of daytime luminance).

なお、以上の実施形態では、本発明をLED式点滅灯に適用した例を示したが、本発明はこれに限られることなく、LED式信号灯器やLED式注意灯あるいはその他のLED発光・表示装置などにも適用可能であり、それらの機器・装置に適用した場合でも、上記と同様な作用効果を達成することできる。   In the above embodiment, an example in which the present invention is applied to an LED flashing light has been described. However, the present invention is not limited to this, and an LED signal lamp, an LED caution light, or other LED light emission / display The present invention can be applied to devices and the like, and even when applied to such devices and apparatuses, the same operational effects as described above can be achieved.

本発明は、複数のLEDが直列接続されたLED群を交流電源からの交流電圧を用いて点灯するにあたり、昼間輝度(最大輝度)から夜間輝度(昼間輝度の15%)までの範囲の調光を問題なく実現するのに有効に利用することができる。   The present invention provides dimming within a range from daytime luminance (maximum luminance) to nighttime luminance (15% of daytime luminance) when lighting an LED group in which a plurality of LEDs are connected in series using an AC voltage from an AC power supply. Can be used effectively to realize the problem without problems.

本発明の点灯制御装置を適用するLED式灯器(LED式点滅灯)の一例を示す正面図(A)及び側面図(B)を併記して示す図である。It is a figure which writes and shows together the front view (A) and side view (B) which show an example of the LED type lamp (LED type flashing light) to which the lighting control apparatus of this invention is applied. 図1のLED式灯器に用いるLEDユニットの正面図である。It is a front view of the LED unit used for the LED type lamp of FIG. 本発明の点灯制御装置の一例の構成を示すブロック図である。It is a block diagram which shows the structure of an example of the lighting control apparatus of this invention. 図3の点灯制御装置で実行する調光制御の説明図である。It is explanatory drawing of the light control performed with the lighting control apparatus of FIG. 図3の点灯制御装置の作用説明図である。It is action explanatory drawing of the lighting control apparatus of FIG. 一般的な位相制御による調光方式の説明図である。It is explanatory drawing of the light control system by general phase control. 図7の調光方式の問題点を示す図である。It is a figure which shows the problem of the light control system of FIG.

符号の説明Explanation of symbols

1 点灯制御装置
2 調光回路
21 ゼロクロス検出部
22 調光制御部
3 点滅回路
4 照度センサ
5 交流電源
10 LED式灯器(点滅灯)
11 発光部
12 LEDユニット
13 LED

DESCRIPTION OF SYMBOLS 1 Lighting control apparatus 2 Dimming circuit 21 Zero cross detection part 22 Dimming control part 3 Flashing circuit 4 Illuminance sensor 5 AC power supply 10 LED type lamp (flashing light)
11 Light emitting unit 12 LED unit 13 LED

Claims (2)

直列接続された複数のLEDを交流電源からの交流電圧を用いて点灯する点灯制御装置であって、交流電圧波形のゼロクロス点を検出するゼロクロス検出部と、前記複数のLEDの調光を制御する調光制御部とを備え、前記調光制御部は、前記ゼロクロス検出部にて検出されたゼロクロス点に基づいて交流電圧波形の波高点を求め、その波高点を基準として前記複数のLEDに供給する電圧のパルス幅を変調するように構成されていることを特徴とするLED点灯制御装置。   A lighting control device that lights a plurality of LEDs connected in series using an AC voltage from an AC power source, and controls a zero-cross detection unit that detects a zero-cross point of an AC voltage waveform, and controls dimming of the plurality of LEDs A dimming control unit, and the dimming control unit obtains a crest point of the AC voltage waveform based on the zero cross point detected by the zero cross detection unit, and supplies the crest point to the plurality of LEDs based on the crest point. An LED lighting control device configured to modulate a pulse width of a voltage to be applied. 前記複数のLEDが設置される場所の周囲の明るさを検出する照度センサを備え、前記調光制御部は、前記照度センサの検出出力に基づいて調光レベルを決定し、その調光レベルに応じて前記複数のLEDに供給する電圧のパルス幅を変調することを特徴とする請求項1記載のLED点灯制御装置。

An illuminance sensor that detects brightness around a place where the plurality of LEDs are installed is provided, and the dimming control unit determines a dimming level based on a detection output of the illuminance sensor, and sets the dimming level to the dimming level. The LED lighting control device according to claim 1, wherein the pulse width of the voltage supplied to the plurality of LEDs is modulated accordingly.

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