WO2020237427A1 - Circuit de bande de lumière souple à del avec lequel la luminosité et la température de couleur sont ajustées simultanément et bande de lumière douce - Google Patents

Circuit de bande de lumière souple à del avec lequel la luminosité et la température de couleur sont ajustées simultanément et bande de lumière douce Download PDF

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Publication number
WO2020237427A1
WO2020237427A1 PCT/CN2019/088339 CN2019088339W WO2020237427A1 WO 2020237427 A1 WO2020237427 A1 WO 2020237427A1 CN 2019088339 W CN2019088339 W CN 2019088339W WO 2020237427 A1 WO2020237427 A1 WO 2020237427A1
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WO
WIPO (PCT)
Prior art keywords
led
color temperature
led light
brightness
circuit
Prior art date
Application number
PCT/CN2019/088339
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English (en)
Chinese (zh)
Inventor
薛丹琳
Original Assignee
深圳迪亚士照明科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 深圳迪亚士照明科技有限公司 filed Critical 深圳迪亚士照明科技有限公司
Priority to PCT/CN2019/088339 priority Critical patent/WO2020237427A1/fr
Publication of WO2020237427A1 publication Critical patent/WO2020237427A1/fr

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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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant

Definitions

  • the invention relates to the field of LED lighting, in particular to a circuit for adjusting the brightness and color temperature of an LED flexible light bar, and to a flexible light bar adopting this circuit.
  • the traditional adjustable brightness and color temperature LED flexible light bar adopts two different color temperature LED circuits to adjust separately.
  • the circuit structure requires three power input lines.
  • Such a circuit needs to be equipped with a dedicated dimming and color temperature controller, and Dimming and color temperature have to be adjusted separately, which is not convenient for installation or modification, and adjustment is not convenient.
  • the number of LEDs in the two LED circuits with different color temperatures is set to be different to form an unbalanced structure.
  • the external dimmable LED driving power supply 11 when the external dimmable LED driving power supply 11 is in a high-brightness output state, its output voltage is high, The current is large, the driving current of the first color temperature LED circuit 12 and the second color temperature LED circuit 13 are equivalent, and the mixed color temperature is higher; when the external dimmable LED driving power supply 11 is in a low-brightness output state, the output voltage is lower and the first The driving current drop of the color temperature LED circuit 12 is much larger than the driving current drop of the second color temperature LED circuit 13.
  • the proportion of low color temperature in the mixed light emitted by the LED light bar increases, so that the overall color temperature of the mixed light is reduced, thereby achieving The purpose of dimming while adjusting the color temperature.
  • the original dimmable function circuit can be connected to realize the function of dimming and color temperature.
  • such a circuit also has some defects: 1. It adopts a voltage regulation method, but the voltage regulation LED dimming power supply has been eliminated in the market, which makes it difficult for the user to find a power supply for the flexible light bar. 2.
  • the color temperature change is directly related to the voltage. When the cascade length of the flexible light bar is long, the color difference will occur due to the inconsistent voltage before and after the flexible light bar, that is, the color difference.
  • the purpose of the present invention is to provide a circuit for adjusting the brightness and color temperature of the flexible LED light bar to solve the above-mentioned defects in the prior art.
  • a circuit for synchronously adjusting brightness and color temperature of an LED flexible light bar which can be adapted to an external constant voltage PWM output dimming power supply (21), the LED flexible light bar circuit includes:
  • the first LED light string (23) is composed of a first current-limiting resistor (2) and a number of first LEDs (1) in series. One end of the first LED light string is connected to the positive bus bar, and the other end is connected to the The negative bus is connected;
  • the second LED light string (24) is composed of a second current-limiting resistor (4) and a number of second LEDs (3) in series, the second LED light string (24) and the first LED light string (23) Connected in parallel, the second LED (3) and the first LED (1) have the same number and different color temperature values;
  • the delay circuit (25) includes a capacitor (6), a charging resistor (7) and a discharging resistor (8).
  • the capacitor and the discharging resistor are connected in parallel and then connected across the control terminal of the switch tube and the negative bus In between, the charging resistor is connected across the control end of the switch tube and the positive bus.
  • the driving current I WW of the above-mentioned first LED light string changes with the power supply voltage V DD
  • the driving current I CW of the second LED light string is generated by the switching tube and the delay circuit as compared with the driving current I WW A delay time t A.
  • the positive bus and the negative bus are connected to an external constant voltage PWM output dimming power supply, and by controlling the duty cycle of the PWM waveform of the power supply voltage V DD , not only the brightness of the LED light-emitting assembly can be adjusted
  • the duty ratio of the PWM waveform changes, the duration of the high level of the drive current I CW t CW.ON and the duration of the high level of the drive current I WW t ON are The ratio t CW.ON /t ON is changed, so that the overall color temperature of the mixed light emitted by the LED light-emitting assembly is changed, so as to achieve the purpose of adjusting the brightness and color temperature step by step.
  • the number of LEDs in the two LED light strings is the same, and the brightness and color temperature are adjusted synchronously by adjusting the duty cycle of the PWM waveform.
  • the power supply voltage VDD remains constant, and the length of the flexible light bar will not produce color difference.
  • the above can be cascaded to any length within the allowable range of the dimming power supply without causing color difference.
  • the voltage control type switch tube is a MOS tube.
  • the present invention also provides a flexible LED light bar with synchronous adjustment of brightness and color temperature.
  • the flexible LED light bar includes: a strip substrate; and the above-mentioned LED flexible light bar circuit; the positive bus and the negative bus are respectively along the The length direction of the substrate is arranged on the back surface of the substrate, and a plurality of the LED light-emitting components are arranged on the front surface of the substrate along the length direction of the substrate.
  • the voltage control type switch tube is a MOS tube.
  • the surface of the substrate is provided with a mark between the adjacent LED light-emitting components.
  • the positive bus bar and the negative bus bar are strip-shaped metal foils. After the light bar is cut along the mark, the positive bus bar and the The negative bus bar constitutes a contact electrode at the cut portion and is used to connect with an external constant voltage PWM output dimming power supply.
  • the present invention has at least the following beneficial effects:
  • Figure 1 is a circuit diagram of an LED flexible light bar with adjustable light and color temperature in the prior art
  • Figure 2 is a circuit diagram of the LED flexible light bar of the present invention.
  • Figure 3 shows the waveform of the working voltage V DD of the corresponding flexible light bar, the waveform of the driving current I WW of the first LED string and the waveform of the second LED light when the external constant voltage PWM output dimming power supply is output with different dimming rates.
  • this circuit for adjusting the brightness and color temperature of the flexible LED light bar includes: a positive bus bar 26, a negative bus bar 27, and a number of LED light-emitting components 22.
  • Each LED light-emitting component 22 includes: a first LED light string 23, a second LED light string 24, a voltage-controlled semiconductor switch tube 5, and a delay circuit 25.
  • the first LED light string 23 is composed of a first current-limiting resistor 2 and a plurality of first LEDs 1 connected in series, in a strip shape. One end of the first LED light string 23 is connected to the positive bus 26 and the other end is connected to the negative bus 27.
  • the second LED light string 24 is composed of a second current-limiting resistor 4 and a number of second LEDs 3 in series, in a strip shape.
  • the second LED light string 24 is connected in parallel with the first LED light string 23.
  • the number is the same as the number of the first LED1, and the color temperature value of the second LED3 is different from the color temperature value of the first LED1.
  • the color temperature value of the first LED1 is smaller than the color temperature value of the second LED3, but the present invention can also be designed in reverse.
  • the voltage controlled semiconductor switch tube 5 is connected to the second LED light string 24, and the voltage controlled semiconductor switch tube 5 is preferably a MOS tube.
  • the delay circuit 25 includes a capacitor 6, a charging resistor 7 and a discharging resistor 8.
  • the capacitor 6 and the discharging resistor 8 are connected in parallel between the control terminal of the switch tube 5 and the negative bus 27, and the charging resistor 7 is connected across the Between the control end of the switch tube 5 and the positive bus 26.
  • the output voltage of the external constant voltage PWM output dimming power supply 21 is a PWM waveform with a period t PWM , and the dimming rate is similar to the duty cycle t D of the waveform.
  • the duty cycle t D of the output PWM voltage is 100%
  • the flexible light bar working voltage V DD is a continuous output
  • the first LED string 23 The driving current I WW of the second LED light string 24 and the driving current I CW of the second LED string 24 are also continuous maximum states, and the two color temperatures maintain a fixed ratio, the soft light bar presents the highest brightness and the color temperature is the first LED light
  • the period t PWM can be any value between 0.0025 milliseconds and 10 milliseconds.
  • the minimum value of the driving current I WW of the first LED light string 23 is 0, and the maximum value I WW.max is determined by the light bar operating voltage V DD , the sum of the forward voltages of all the first LED1 and the first limit.
  • the resistance value of the second current limiting resistor 4 is a constant determined by the voltage drop between the drain and source of the MOS tube (the switch tube 5).
  • the driving current I WW of the first LED light string 23 should follow the change of the power supply voltage V DD , and its waveform is shown in Fig. As shown in 3, the duration of I WW.max in any cycle t PWM is t ON .
  • the gate voltage u GS cannot change suddenly, u GS ⁇ the starting voltage U T of the MOS tube, and the MOS tube is in the cut-off state, and the driving current I CW of the second LED string 24 remains at 0; it is necessary to wait for the power supply to pass through the charging resistor 7
  • the light-emitting brightness of the second LED light string 24 and the light-emitting brightness of the first LED light string 23 are reversed to obtain the opposite color temperature change effect.
  • the delay time t A can be any value between 0.001 milliseconds and 5 milliseconds.
  • the present invention uses two LED light strings with different color temperatures to be connected in parallel to form an LED light-emitting assembly, and the two LED light strings with different color temperatures have the same number of LEDs.
  • one LED light string directly emits light through a current limiting resistor, and the other LED light string is controlled by a MOS tube to emit light.
  • the ratio of the luminous time of the low color temperature LED string and the high color temperature LED string of two LED strings with different color temperatures under different dimming rates is changed to achieve simultaneous dimming ,
  • the color temperature also changes, achieving the purpose of synchronous adjustment of brightness and color temperature.
  • the constant voltage PWM output dimming power supply that is commonly used in the market can realize the synchronization adjustment effect of brightness and color temperature, and can be connected to any length within the allowable range of the dimming power supply. Will not cause color difference.
  • the voltage-controlled semiconductor switch tube Since the voltage-controlled semiconductor switch tube is used, when the capacitor 6 is charged, the charging current will not be shunted by the switch tube and will not cause deviation of the delay time t A , so the color temperature adjustment consistency is good, and the product qualification rate is high.
  • All the parts of the invention can find ready-made miniature packaging sizes, can be conveniently arranged on the flexible PCB, and have practical value.
  • the flexible light bar includes a strip substrate, the positive bus bar and the negative bus bar are respectively arranged on the back of the substrate along the length direction of the substrate,
  • the LED light-emitting assembly is arranged on the front surface of the substrate along the length direction of the substrate.
  • a mark may be provided between the adjacent LED light-emitting components on the surface of the substrate. In this way, people can easily find the head and tail of the LED light-emitting assembly, and can quickly cut.
  • the positive bus bar and the negative bus bar are made of strip-shaped metal foil. After the light bar is cut along the mark, the positive bus bar and the negative bus bar form a contact electrode at the cutting position, and the cut end After being plugged into the power output socket of the external constant voltage PWM output dimming power supply, the contact electrode contacts with the electrode in the power output socket to realize electrical connection. In this way, the flexible light bar can be used after being cut, and there is no need to install a plug.

Abstract

L'invention concerne un circuit de bande de lumière souple à DEL avec lequel la luminosité et la température de couleur sont ajustées simultanément et une bande de lumière douce. Le circuit comprend : un bus d'électrode positive (26), un bus d'électrode négative (27), et plusieurs composants électroluminescents à DEL (22). Chaque composant électroluminescent à DEL comprend : une première guirlande lumineuse à DEL (23) et une seconde guirlande lumineuse à DEL (24) connectées en parallèle, un transistor de commutation à semi-conducteur commandé en tension (5) connecté dans la seconde guirlande lumineuse à DEL, et un circuit à retard (25) connecté à une extrémité de commande du transistor de commutation. Les DEL dans les guirlandes lumineuses à DEL sont identiques en nombre mais différentes dans la température de couleur. La bande de lumière souple comprend un substrat de type bande et le circuit de bande de lumière souple. Le bus d'électrode positive et le bus d'électrode négative sont respectivement disposés sur le côté arrière du substrat dans la direction longitudinale du substrat. Les plusieurs composants électroluminescents à DEL sont disposés sur le côté avant du substrat dans la direction longitudinale du substrat. Une alimentation électrique pour le présent circuit est facile à adapter, aucune aberration chromatique n'est produite avec une augmentation de la longueur de la bande lumineuse, et la cohérence des ajustements de température de couleur est importante.
PCT/CN2019/088339 2019-05-24 2019-05-24 Circuit de bande de lumière souple à del avec lequel la luminosité et la température de couleur sont ajustées simultanément et bande de lumière douce WO2020237427A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2019/088339 WO2020237427A1 (fr) 2019-05-24 2019-05-24 Circuit de bande de lumière souple à del avec lequel la luminosité et la température de couleur sont ajustées simultanément et bande de lumière douce

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2019/088339 WO2020237427A1 (fr) 2019-05-24 2019-05-24 Circuit de bande de lumière souple à del avec lequel la luminosité et la température de couleur sont ajustées simultanément et bande de lumière douce

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WO2020237427A1 true WO2020237427A1 (fr) 2020-12-03

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3197202U (ja) * 2015-01-15 2015-04-30 蔡 孝昌Ｈｓｉａｏ Ｃｈａｎｇ Ｔｓａｉ Ｌｅｄ照明装置の制御回路
CN204786255U (zh) * 2015-07-28 2015-11-18 王稀猛 一种智能照明控制系统
CN106332369A (zh) * 2016-10-10 2017-01-11 深圳迪亚士照明科技有限公司 Led灯条调光调色温电路
CN206018532U (zh) * 2016-08-04 2017-03-15 深圳市泓亚智慧科技股份有限公司 一种可裁切防短路的柔性基板以及使用该基板的灯带
US9756696B1 (en) * 2016-10-17 2017-09-05 Cree, Inc. Configurable LED lighting apparatus
CN107835539A (zh) * 2017-10-09 2018-03-23 中山市光兴照明科技有限公司 一种新型led灯带
CN207399569U (zh) * 2017-11-07 2018-05-22 厦门市义圆源科技有限公司 一种led调光调色电路

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3197202U (ja) * 2015-01-15 2015-04-30 蔡 孝昌Ｈｓｉａｏ Ｃｈａｎｇ Ｔｓａｉ Ｌｅｄ照明装置の制御回路
CN204786255U (zh) * 2015-07-28 2015-11-18 王稀猛 一种智能照明控制系统
CN206018532U (zh) * 2016-08-04 2017-03-15 深圳市泓亚智慧科技股份有限公司 一种可裁切防短路的柔性基板以及使用该基板的灯带
CN106332369A (zh) * 2016-10-10 2017-01-11 深圳迪亚士照明科技有限公司 Led灯条调光调色温电路
US9756696B1 (en) * 2016-10-17 2017-09-05 Cree, Inc. Configurable LED lighting apparatus
CN107835539A (zh) * 2017-10-09 2018-03-23 中山市光兴照明科技有限公司 一种新型led灯带
CN207399569U (zh) * 2017-11-07 2018-05-22 厦门市义圆源科技有限公司 一种led调光调色电路

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