WO2012063815A1 - Led点灯装置およびled照明装置 - Google Patents
Led点灯装置およびled照明装置 Download PDFInfo
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- WO2012063815A1 WO2012063815A1 PCT/JP2011/075713 JP2011075713W WO2012063815A1 WO 2012063815 A1 WO2012063815 A1 WO 2012063815A1 JP 2011075713 W JP2011075713 W JP 2011075713W WO 2012063815 A1 WO2012063815 A1 WO 2012063815A1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/375—Switched mode power supply [SMPS] using buck topology
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
- H05B45/24—Controlling the colour of the light using electrical feedback from LEDs or from LED modules
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Definitions
- Embodiments of the present invention relate to an LED lighting device capable of toning and dimming, and an LED lighting device including the same.
- the pulse width control method has a problem that a flicker phenomenon is likely to occur at the time of photographing with a camera, or noise is likely to occur when a current value is large. Therefore, it is not preferable to adopt the pulse width control method over the entire dimming region.
- flicker phenomenon and noise do not occur, but in the case of an LED, it has been found that the color temperature of the LED greatly decreases in a deep dimming region where the dimming degree is small. For this reason, when performing continuous light control while adjusting the color, there is a problem that the color temperature of the toned color is greatly shifted from the design value when reaching the deep light adjustment region, and the desired color temperature is not obtained.
- the amplitude control method when the current value becomes small and deep dimming is performed, the brightness tends to vary depending on the LED. On the other hand, there is no such problem in the case of the pulse width control method. Therefore, a continuous current is supplied to the LED in a region where the current value is large and the dimming is shallow, and in the dimming region where the current value is small and the dimming is deep, a PWM current which is a rectangular wave whose pulse width is controlled is supplied. Any of the problems can be overcome.
- the LED lighting device that enables dimming and toning is configured by switching between a continuous current and a PWM current with reference to a predetermined threshold current as a current supplied to the LED,
- toning control is performed in a dimming region where the dimming level is deeper than the threshold value, flickering in brightness is easily perceived by humans.
- flickering in brightness is difficult for humans to perceive.
- the inventor performs the toning control in the dimming region where the dimming level is deeper than the threshold as described above, the flickering of the brightness is easily perceived by a person for the deep dimming degree. And found that the resolution of the PWM frequency is too low.
- FIG. 5 is a graph conceptually illustrating continuous light control and current waveform at the same time in amplitude control and pulse width control.
- FIG. It is a graph which similarly shows the color temperature shift of light emission of LED in amplitude control and pulse width control. It is a graph which shows the correlation of the light control and the color control of the LED lighting device concerning 2nd Embodiment.
- a plurality of types of LEDs having different color temperatures; an LED lighting circuit that lights each of the plurality of types of LEDs; and a current ratio that simultaneously turns on the plurality of types of LEDs and supplies them to the plurality of types of LEDs
- Dimming control for controlling the LED lighting circuit to change the current while maintaining the current substantially constant, and the LED lighting circuit to change the current ratio while maintaining the sum of the currents supplied to the plurality of types of LEDs substantially constant
- the dimming degree of the plurality of types of LEDs is the first predetermined value and the dimming degree is 20% or less.
- the second LED 2 has a light color of light output, for example, which is relatively reddish, in other words, has a relatively low color temperature and is an L color in the range of correlated color temperatures 2580 to 2870K.
- the one of 2800K is used.
- the color temperature may be obtained by a single type of LED as in the case of the first LED 1 or may be obtained by additive mixing of light emitted from a plurality of types of LEDs having different emission colors.
- the number of the first and second LEDs 1 and 2 is not particularly limited, one or any of a plurality of arbitrary LEDs are used by being appropriately connected in series or in series-parallel to the lighting circuit 3 described later. be able to. And the number of 1st LED1 and 2nd LED2 may be equal, and does not need to be equal.
- the LED lighting circuit 3 can perform the dimming operation by the amplitude control and the dimming operation by the pulse width control by sharing the dimming region, as shown as an example by the lighting circuit element 3a of FIG. It is configured as follows.
- current feedback is performed in the case of amplitude control
- voltage control is performed in the case of pulse width control.
- a current detecting resistor R1 is inserted in series in the circuit portion where the increased current flowing in the series circuit and the decreased current of the inductor L1, the output capacitor C1 and the closed circuit of the diode D1 flow together, The terminal voltage is detected for current feedback. Further, the terminal voltage of the output capacitor C1 is detected for voltage feedback.
- Each of the detection signals is control-inputted to a control means 4 (to be described later) via a switching circuit shown in FIG.
- the current detection signal obtained from both ends of the resistor R1 is input to one input terminal of the first comparator CP1.
- the output detection signal obtained from the output capacitor C1 is input to one input terminal of the second comparator CP2.
- the output terminal of the first reference value generation circuit E1 is connected to the other input terminal of the first comparator CP1.
- the output terminal of the second reference value generating circuit E2 is connected to the other input terminal of the second comparator CP2.
- the dimming signal DS is input to the input ends of the first and second reference value generation circuits E1 and E2.
- the first reference value generation circuit E1 generates a reference voltage for other dimming regions other than the deep dimming region where the dimming signal DS is 20% or less.
- the second reference value generation circuit E2 generates a reference voltage in the deep dimming region where the dimming signal has a dimming degree of 20% or less. Then, the output signals of the first and second reference value generation circuits E1 and E2 are input to the control means 4 to be described later via the OR circuit OR, and amplitude control and pulse width control corresponding to the dimming degree are performed. Contributes to feedback control.
- the control means 4 is a means for controlling the LED lighting circuit 3, but can control at least the lighting of the first and second LEDs 1 and 2. Further, the LED lighting circuit 3 is controlled by switching between amplitude control and pulse width control in accordance with the dimming degree of the first and second LEDs 1 and 2 during dimming. Amplitude control functions at the time of light control in other regions other than the deep light control region of 20% or less of the total light control region. Further, the pulse width control functions at the time of light control in a light control region of 20% or less that is a deep light control region.
- the output current of the LED lighting circuit 3 is changed according to the dimming degree.
- the control means 4 operates correspondingly, and the increase current of the step-down chopper is changed according to the dimming signal. Therefore, the output current of the LED lighting circuit 3 changes according to the dimming degree. As a result, the first and second LEDs 1 and 2 are dimmed according to the dimming degree.
- reference numerals IF1 to IF4 provided in the lighting circuit 3 are interposed between the control means 4 and an interface circuit provided to ensure control by the control means 4 described later. And the voltage feedback interfaces IF2 and IF4 as well as the current feedback interfaces IF1 and IF3 of the first and second lighting circuit elements.
- Reference sign DSG1 is a drive signal generating circuit for driving the switching element of the first lighting circuit element 3a
- reference sign DSG2 is a drive signal generating circuit for driving the switching element of the second lighting circuit element 3b.
- the feedback switching circuit shown in FIG. 2 is not shown.
- the lighting circuit 3 includes load current detection means and load voltage detection means, which are not shown. These means are provided in each circuit block of the first lighting circuit element 3a and the second lighting circuit element 3b.
- the detection output of the load current detection means is sent to the control means 4 described later via the interface circuit IF1 of the first lighting circuit element 3a and the interface circuit IF3 of the second lighting circuit element 3b.
- the detection output of the load voltage detection means is a control input to the control means 4 to be described later via the interface circuit IF2 of the first lighting circuit element 3a and the interface circuit IF4 of the second lighting circuit element 3b. Is done.
- the dimming range of the plurality of types of LEDs 1 and 2 has a dimming region that covers the entire light, that is, the dimming degree of 100% to the dimming lower limit, for example, 1%.
- the horizontal axis represents the dimming degree (%)
- the vertical axis represents the brightness (%)
- the dimming characteristic indicating the relationship between the dimming degree and the brightness is a straight line.
- the lower limit of dimming is 1%, but the dimming degree is drawn as 0% because of the limit shown.
- the amplitude control operation and the pulse width control operation of each lighting circuit element are described according to the dimming degree.
- LED1 is amplitude controlled
- the second LED2 is controlled by pulse width control. That is, in the case where the desired color mixture is performed by the first LED 1 and the second LED 2 and the toning control is performed, the current supplied to each LED from each lighting circuit element when reproducing the desired color temperature is in the all-light state.
- the pulse width control is performed as described above in order to suppress the color temperature shift. This embodiment also includes such aspects.
- the lighting circuit 3 is controlled so that the dimming control and the toning control can be selectively performed on the plurality of types of LEDs 1 and 2 as desired.
- the dimming control the current is changed, that is, the dimming control is performed while maintaining the current ratio supplied from the lighting circuit 3 to the plurality of types of LEDs 1 and 2 substantially constant.
- the current ratio is changed, that is, the dimming control is performed in the opposite directions while maintaining the sum of the currents supplied from the lighting circuit 3 to the plurality of types of LEDs 1 and 2 substantially constant.
- the current supplied from the lighting circuit 3 to the plurality of types of LEDs 1 and 2 is a continuous current when the dimming degree exceeds the first predetermined value as a threshold value. If it is less than that, it will be PWM current.
- the continuous current is a direct current that is amplitude-controlled and continuous.
- the PWM current is a rectangular-wave direct current with pulse width control.
- the first predetermined value may be set in consideration of an appropriate safety factor in the dimming degree that causes inconveniences such as a shift in emission color in the case of dimming by continuous current due to deep dimming. it can.
- the dimming degree is preferably set within a range of 15 to 25%.
- the PWM frequency of the PWM current under the control of the above (2) by the first predetermined value can be generally employed, for example, about 500 Hz to 1 kHz, preferably about 800 Hz.
- the dimming characteristic lines D1 to D11 will be described with reference to FIG.
- the dimming characteristic line D6 indicates that 100% of the point in the upper right corner of the graph indicates 100% dimming state of the entire LED lighting device, and the first and second LEDs 1 and 2 are respectively 50% contribution.
- the intersection of 20% is a dimming state of 20% as a whole, and the first and second LEDs 1 and 2 contribute 10%.
- the intersection of 16% is 16% dimming as a whole, and the first and second LEDs 1 and 2 contribute 8%.
- the intersection of 8% is 8% dimming as a whole, and the first and second LEDs 1 and 2 contribute 4%.
- the toning characteristic line C6 is a toning characteristic line that connects a point with a dimming degree of 50% on the horizontal axis and a point with a dimming degree of 50% on the vertical axis. This intersection indicates that the entire LED lighting device in which only the first LED 1 is lit is in a toning state with a dimming degree of 50%.
- the light color at this time is a light color in which bluishness is emphasized in the case of the LED 1 having the above-described emission color.
- the LED lighting device as a whole in the dimming control and the toning control, the LED lighting device as a whole is continuously in the state where the dimming degree exceeds 20% (10% for the first or second LED).
- the current is supplied to turn on the LEDs 1 and 2, but when any one of the LEDs 1 or 2 has a dimming degree of 10% or less, at least the continuous current supplied to the LED is switched to the PWM current.
- the entire LEDs 1 and 2 can be switched to the PWM current.
- the PWM frequency is changed from 800 Hz.
- the first and second LEDs 1 and 2 are turned on by switching to 300 Hz. That is, the toning characteristic line C3 connecting the 8% dimming points on the horizontal axis and the vertical axis in the figure intersects the dimming characteristic lines D1 to D11, so that the toning is switched at each intersection. If the PWM frequency is lowered at the time of toning switching, the resolution of the pulse width control is increased, so that flickering of brightness is easily perceived.
- the first and second LEDs 1 and 2 are also supplied.
- the PWM frequency of the PWM current is switched to a low value.
- the PWM frequency is lowered only in the toning changing process of transition from one intersection to the next adjacent intersection. Then, after reaching the target level, the PWM frequency returns to a relatively high PWM frequency again. If the PWM frequency is low, a strobe effect occurs, which is not preferable. However, by returning to the original PWM frequency after reaching the target level, the generation of the strobe effect can be suppressed.
- the PWM frequency When switching the PWM frequency, it can be configured not to change the duty of the pulse width control. If the duty of the pulse width control changes when switching the PWM frequency, the dimming degree changes during the toning control, giving a sense of discomfort to the user of the LED lighting device. According to this aspect, since the light control degree does not change during the color control, the user of the LED lighting device does not feel uncomfortable.
- the duty of the pulse width control can be changed.
- the PWM frequency is switched, if the light emission of the LED changes, the duty ratio of the pulse width control can be changed to compensate for the change.
- the change in the light emission of the LED is reduced, so that the change in the light emission of the LED is reduced.
- the change in light emission includes brightness and / or light color.
- the PWM frequency of the PWM current is set. By making it low, it is possible to provide an LED lighting device in which flickering of brightness is suppressed even when toning control is performed in a region where the degree of dimming is deeper.
- the LED lighting device includes the LED lighting device main body and the LED lighting device of the above-described embodiment disposed in the LED lighting device main body.
- the LED illumination device is allowed to be various devices including the first and second LEDs.
- the LED lighting device main body refers to the remaining part excluding the LED lighting device from the LED lighting device.
- the LED lighting circuit of the LED lighting device may be disposed at a position separated from the LED lighting device main body.
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Abstract
Description
Claims (7)
- 色温度の異なる複数種のLEDと;
複数種のLEDをそれぞれ点灯するLED点灯回路と;
複数種のLEDを同時に点灯して複数種のLEDに供給する電流比率を略一定に維持しながら電流を変化させるようにLED点灯回路を制御する調光制御および複数種のLEDに供給する電流の和を略一定に維持しながら電流比率を変化させるようにLED点灯回路を制御する調色制御を選択的に行うことができるとともに、調光制御および調色制御のいずれにおいても複数種のLEDの調光度が第1の所定値である調光度20%以下の領域においてはLEDにPWM電流を供給し、それ以上のときはLEDに連続電流を供給する制御手段と;
を具備していることを特徴とするLED点灯装置。
- 前記制御手段は、複数種のLED調光度がともに第1の所定値より低い第2の所定値以下のとき調色制御を行う際にPWM電流のPWM周波数を低くするように点灯回路を制御することを特徴とする請求項1記載のLED点灯装置。
- 制御手段は、複数種のLEDの調光度が第2の所定値以下で調色制御を行う際に、その変化過程においてのみPWM周波数を低くすることを特徴とする請求項2記載のLED点灯装置。
- 制御手段は、調色制御の変化過程において低くしたPWM周波数を調色制御が目標レベルに到達後、遅延時間を経て元のPWM周波数に戻すことを特徴とする請求項2記載のLED点灯装置。
- 制御手段は、PWM周波数を切り換える際にパルス幅制御のデューティ比を変化させないことを特徴とする請求項2のいずれか一記載のLED点灯装置。
- 制御手段は、PWM周波数を切り換えることによりLEDの発光が変化する場合には、その変化を補償するようにパルス幅制御のデューティ比を変化させることを特徴とする請求項2のいずれか一記載のLED点灯装置。
- 照明装置本体と;
照明装置本体に配設された請求項1ないし6のいずれか一記載のLED点灯装置と;
を具備していることを特徴とする照明装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11840084.5A EP2640165A1 (en) | 2010-11-12 | 2011-11-08 | Led ignition apparatus and led lighting apparatus |
JP2012542928A JP5618220B2 (ja) | 2010-11-12 | 2011-11-08 | Led点灯装置およびled照明装置 |
US13/884,941 US20130293134A1 (en) | 2010-11-12 | 2011-11-08 | Led lighting device and led luminaire |
CN201180054126.1A CN103222341B (zh) | 2010-11-12 | 2011-11-08 | Led点灯装置以及led照明装置 |
Applications Claiming Priority (4)
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JP2010-254325 | 2010-11-12 | ||
JP2010254325 | 2010-11-12 | ||
JP2011090531 | 2011-04-14 | ||
JP2011-090531 | 2011-04-14 |
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WO2012063815A1 true WO2012063815A1 (ja) | 2012-05-18 |
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PCT/JP2011/075713 WO2012063815A1 (ja) | 2010-11-12 | 2011-11-08 | Led点灯装置およびled照明装置 |
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US (1) | US20130293134A1 (ja) |
EP (1) | EP2640165A1 (ja) |
JP (3) | JP5618220B2 (ja) |
CN (2) | CN103222341B (ja) |
WO (1) | WO2012063815A1 (ja) |
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- 2011-11-08 EP EP11840084.5A patent/EP2640165A1/en not_active Withdrawn
- 2011-11-08 US US13/884,941 patent/US20130293134A1/en not_active Abandoned
- 2011-11-08 CN CN201410645531.6A patent/CN104363682B/zh not_active Expired - Fee Related
- 2011-11-08 JP JP2012542928A patent/JP5618220B2/ja not_active Expired - Fee Related
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2014022196A (ja) * | 2012-07-18 | 2014-02-03 | Nec Lighting Ltd | Led点灯装置 |
JP2014123448A (ja) * | 2012-12-20 | 2014-07-03 | Minebea Co Ltd | Led駆動装置及び照明器具 |
WO2014115009A1 (en) * | 2013-01-22 | 2014-07-31 | Koninklijke Philips N.V. | Light source and illumination system for aquaculture application. |
WO2014187004A1 (zh) * | 2013-05-20 | 2014-11-27 | 深圳市华星光电技术有限公司 | 一种led背光驱动电路、背光模组和液晶显示装置 |
CN104685971A (zh) * | 2013-05-20 | 2015-06-03 | 深圳市华星光电技术有限公司 | 一种led背光驱动电路、背光模组和液晶显示装置 |
US9237609B2 (en) | 2013-05-20 | 2016-01-12 | Shenzhen China Star Optoelectronics Technology Co., Ltd | LED backlight driving circuit, backlight module, and LCD device |
US9655194B2 (en) | 2014-06-25 | 2017-05-16 | Panasonic Intellectual Property Management Co., Ltd. | Lighting control device, lighting device, and lighting fixture |
JP2016157515A (ja) * | 2015-02-23 | 2016-09-01 | 株式会社アグリライト研究所 | Led点灯回路、ledランプ及びled点灯装置並びにこれらに用いる通電制御回路 |
JP2018163852A (ja) * | 2017-03-27 | 2018-10-18 | 株式会社共進電機製作所 | 点灯装置 |
CN112020170A (zh) * | 2019-05-28 | 2020-12-01 | 聚众联合科技股份有限公司 | 光源调整系统 |
JP2020194768A (ja) * | 2019-05-28 | 2020-12-03 | グニテック コーポレーション | 光源調整システム |
Also Published As
Publication number | Publication date |
---|---|
CN104363682A (zh) | 2015-02-18 |
US20130293134A1 (en) | 2013-11-07 |
CN103222341B (zh) | 2014-12-10 |
JP5936086B2 (ja) | 2016-06-15 |
JP5618220B2 (ja) | 2014-11-05 |
JP2014222668A (ja) | 2014-11-27 |
CN104363682B (zh) | 2017-04-12 |
JPWO2012063815A1 (ja) | 2014-05-12 |
JP2015043326A (ja) | 2015-03-05 |
JP5783479B2 (ja) | 2015-09-24 |
CN103222341A (zh) | 2013-07-24 |
EP2640165A1 (en) | 2013-09-18 |
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