CN210124031U

CN210124031U - LED lighting system capable of adaptively adjusting light according to ambient illumination

Info

Publication number: CN210124031U
Application number: CN201920683912.1U
Authority: CN
Inventors: 毛梦晴; 金赟妍; 郑子晨; 许成龙; 郑盛梅
Original assignee: Quzhou College of Technology
Current assignee: Quzhou College of Technology
Priority date: 2019-05-14
Filing date: 2019-05-14
Publication date: 2020-03-03
Anticipated expiration: 2029-05-14

Abstract

The utility model provides a LED lighting system that self-adaptation was thrown light on according to ambient light intensity, including the illuminance sensor, couple the voltage conversion circuit of illuminance sensor, couple the LED drive circuit of voltage conversion circuit to and couple the LED light source of LED drive circuit; the LED light source comprises an illumination sensor, a voltage conversion circuit, an LED drive circuit and an LED light source, wherein the illumination sensor outputs a photocurrent in a proportional relation with the illumination intensity received by a receiving surface of the illumination sensor, the voltage conversion circuit converts the photocurrent output by the illumination sensor into a voltage changing along with the illumination intensity, and the LED drive circuit adjusts the output current of the LED drive circuit based on the voltage so as to control the brightness of the LED light source. The utility model discloses a LED lighting system can realize the illumination of the constant illumination intensity of environment automatically, promotes the comfort level of environment better in the energy saving, and has low-cost advantage.

Description

LED lighting system capable of adaptively adjusting light according to ambient illumination

Technical Field

The utility model relates to a lighting apparatus field, concretely relates to LED lighting system of self-adaptation light modulation.

Background

With the increasing exhaustion of non-renewable resources and the attention of people on energy conservation and emission reduction, LED lamps with high lighting effect, long service life and no mercury pollution are more and more generally applied. To further save energy, people are beginning to research intelligent control on LED lamps. The existing intelligent lighting control system mainly utilizes a microprocessor unit to receive instructions of a user or receive information transmitted by various sensors (such as a light intensity sensor, an infrared sensor, a motion sensor and the like), and then realizes the control of performances such as brightness, color temperature and the like of an LED lamp through complex programming, control software and the like. The user needs to use the related remote controller or install corresponding software in the own mobile phone or computer to control the LED. The limitation is that additional complex hardware and software are required to be installed to control the lamp, which increases the cost, so that an LED lighting system with low cost and adaptive light modulation according to the ambient illumination is required.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem provide a low cost, can realize the illumination of the constant illuminance of environment automatically, promote the LED lighting system of the comfort level of environment better in the energy saving.

In order to solve the above problem, the utility model adopts the following technical scheme:

an LED illumination system capable of adaptively adjusting light according to ambient illumination comprises an illumination sensor, a voltage conversion circuit coupled with the illumination sensor, an LED driving circuit coupled with the voltage conversion circuit, and an LED light source coupled with the LED driving circuit; the LED light source comprises an illumination sensor, a voltage conversion circuit, an LED drive circuit and an LED light source, wherein the illumination sensor outputs a photocurrent in a proportional relation with the illumination intensity received by a receiving surface of the illumination sensor, the voltage conversion circuit converts the photocurrent output by the illumination sensor into a voltage changing along with the illumination intensity, and the LED drive circuit adjusts the output current of the LED drive circuit based on the voltage so as to control the brightness of the LED light source.

Optionally, the illuminance sensor includes a photo-electric tube, a photomultiplier tube, a PIN tube, or an avalanche photodiode.

Optionally, the LED driving circuit includes an LED driving chip LT1937, a voltage source V1, capacitors C1, C2, an inductor L1, resistors R1-R3, and a schottky diode D1, the voltage conversion circuit includes a resistor R4, and the LED light source includes light emitting diodes D2-D4; the Vin pin and the SHDN pin of the LED driving chip LT1937 are coupled to the anode of the voltage source V1, the capacitor C2 and one end of the inductor L1, the SW pin is coupled to the other end of the inductor L1 and one end of the schottky diode D1, and the FB pin is coupled between the series resistors R2 and R3; the resistor R4 is coupled in parallel to the output end of the illuminance sensor, and has a first end coupled to the other end of the resistor R3 and a second end grounded; the light emitting diodes D2-D4 are sequentially coupled in series in the same direction, the anode of the diode D2 is coupled to the other end of the schottky diode D1 and one end of the capacitor C1, and the cathode of the diode D4 is coupled to the other end of the resistor R2 and one end of the resistor R1; the negative electrode of the voltage source V1, the other ends of the capacitors C1 and C2 and the resistor R1 and the GND pin of the LED driving chip LT1937 are grounded.

Optionally, the LED driving circuit includes an LED driving chip LT3491, a voltage source V1, a capacitor C1, a capacitor C3, an inductor L1, and a resistor R1, the voltage conversion circuit includes a resistor R2, and the LED light source includes light emitting diodes D1-D4; the Vin pin of the LED driving chip LT3491 is coupled to the positive electrode of the voltage source V1 and one end of the capacitor C1 and the inductor L1, the SW pin is coupled to the other end of the inductor L1, and the Cap pin is coupled to one end of the resistor R1 and one end of the capacitor C3; the resistor R2 is coupled in parallel to the output end of the illuminance sensor, and has a first end coupled to the CTRL pin of the LED driver chip LT3491 and a second end grounded; the light emitting diodes D1-D4 are sequentially coupled in series in the same direction, and the anode of the diode D1 is coupled with the LED pin of the LED driving chip LT3491 and the other end of the resistor R1; the negative electrode of the voltage source V1, the other ends of the capacitors C1 and C3, the negative electrode of the diode D4 and the GND pin of the LED driving chip LT3491 are grounded.

Optionally, the LED driving circuit includes an LED driving chip LT3486, a voltage source V1, capacitors C1-C4, an inductor L1, a schottky diode D7, and resistors R1-R3, the voltage conversion circuit includes a resistor R4, and the LED light source includes light emitting diodes D1-D6; the pin Vin, the pin SHDN and the pin PWM1 of the LED driving chip LT3486 are coupled to the anode of the voltage source V1 and one end of the capacitor C1 and one end of the inductor L1, the pin SW1 is coupled to the other end of the inductor L1 and one end of the schottky diode D7, and the pin REF is coupled to one end of the capacitor C4; the resistor R4 is coupled in parallel to the output end of the illuminance sensor, and has a first end coupled to the CTRL1 pin of the LED driver chip LT3486 and a second end grounded; the light emitting diodes D1-D6 are sequentially coupled in series in the same direction, the anode of the diode D2 is coupled with the other end of the Schottky diode D7, the OVP1 pin of the LED driving chip LT3486 and one end of the capacitor C2, and the cathode of the diode D6 is coupled with the FB1 pin of the LED driving chip LT3486 and one end of the resistor R3; the negative electrode of the voltage source V1, the other ends of the capacitors C1, C2 and C4 and the resistor R3 and the GND pin of the LED driving chip LT3486 are grounded; the pin Vc1 of the LED driving chip LT3486 is grounded through a resistor R1 and a capacitor C3, and the pin Rt of the LED driving chip LT3486 is grounded through a resistor R2.

Further, the resistor in the voltage conversion circuit is an adjustable resistor.

The utility model has the advantages as follows:

the utility model discloses a LED lighting system can realize the permanent illuminance requirement of lighting environment according to the light output intensity of current illumination intensity regulation LED lamps and lanterns automatically, promotes the comfort level of environment better in the energy saving. And simultaneously, the utility model discloses a characteristics are that utilize light intensity sensor's photocurrent directly as the control signal of LED driver, control the light output of LED light source, save hardware such as microprocessor and complicated programming, make the system more simple, the cost is also lower. In addition, the system can also integrate a manual setting function, and a user can set the target illumination of the environment so as to meet the requirements of different users, different time periods or different indoor scenes, so that the system is more humanized.

Drawings

Fig. 1 is a schematic diagram of the unit composition and signal conversion of the LED lighting system according to the embodiment of the present invention.

Fig. 2 is a response characteristic curve of the illuminance sensor according to the embodiment of the present invention.

Fig. 3 is a schematic circuit diagram of an LED lighting system according to a first embodiment of the present invention.

Fig. 4 is a schematic circuit diagram of an LED lighting system according to a second embodiment of the present invention.

Fig. 5 is a schematic circuit diagram of an LED lighting system according to a third embodiment of the present invention.

Fig. 6 is a simulation relationship curve between the output current of the LED driving circuit and the photocurrent of the illuminance sensor in the system according to the embodiment of the present invention.

Fig. 7 is a simulation diagram illustrating the influence of the resistance of the voltage conversion circuit on the lighting system in the system according to the embodiment of the present invention.

Detailed Description

For further understanding of the present invention, preferred embodiments of the present invention will be described below with reference to examples, but it should be understood that these descriptions are only for the purpose of further illustrating the features and advantages of the present invention, and are not intended to limit the claims of the present invention.

The utility model provides a LED lighting system according to environment illuminance self-adaptation light, as shown in FIG. 1, it includes illuminance sensor, couples illuminance sensor's voltage conversion circuit, couples voltage conversion circuit's LED drive circuit to and couple LED drive circuit's LED light source.

The illuminance sensor is a device for detecting the intensity of light, and as shown in fig. 2, it is a response characteristic curve of a typical illuminance sensor, the magnitude of the output photocurrent is proportional to the intensity of light received by its receiving surface, and its function in the circuit is equivalent to a current source whose current varies with the intensity of light, and its current magnitude is determined by the intensity of light from the outside. Therefore, in the circuit schematic diagram of the subsequent embodiment, a current source I1 is used instead of the light intensity sensor.

As an alternative embodiment, the illuminance sensor is one of a photo-electric tube, a photomultiplier tube, a PIN tube, or an avalanche photodiode.

The voltage conversion circuit functions to convert a current that varies with the intensity of illumination into a voltage that varies with the intensity of illumination. Since most of the LED driving circuits can receive the dimming signal as a PWM signal or a voltage signal, the photocurrent needs to be converted into the voltage signal. The utility model discloses in, voltage conversion circuit accessible resistance realizes.

The LED driving circuit can convert the mains voltage into the voltage and current suitable for the LED, and can adjust the brightness of the LED. The utility model provides a LED drive circuit can be according to impressed voltage's size regulation output current's size to the regulation of LED's light output intensity is realized.

The LED light source is the core part of the whole lighting system and is the key factor for realizing low-energy operation of the system. The LED lamp with high photoelectric conversion efficiency and stable and reliable quality is selected in the embodiment, and the series/parallel connection mode of the LED lamp beads in the LED lamp is reasonably designed, so that the requirements on voltage, current and power can be matched with the output of LED drive.

The solution of the present invention will be further explained with reference to the following specific examples.

Example 1

As shown in fig. 3, in the present embodiment, the LED driving circuit includes an LED driving chip LT1937, a voltage source V1, capacitors C1, C2, an inductor L1, resistors R1 to R3, and a schottky diode D1, the voltage converting circuit includes a resistor R4, and the LED light source includes light emitting diodes D2 to D4. The LT1937 is a constant current LED driving chip capable of regulating output current by DC voltage, and the output current can be changed by connecting a variable voltage to the FB pin.

The Vin pin and the SHDN pin of the LED driving chip LT1937 are coupled to the anode of the voltage source V1, the capacitor C2 and one end of the inductor L1, the SW pin is coupled to the other end of the inductor L1 and one end of the schottky diode D1, and the FB pin is coupled between the series resistors R2 and R3; the resistor R4 is coupled in parallel to the output end of the illuminance sensor, and has a first end coupled to the other end of the resistor R3 and a second end grounded; the light emitting diodes D2-D4 are sequentially coupled in series in the same direction, the anode of the diode D2 is coupled to the other end of the schottky diode D1 and one end of the capacitor C1, and the cathode of the diode D4 is coupled to the other end of the resistor R2 and one end of the resistor R1; the negative electrode of the voltage source V1, the other ends of the capacitors C1 and C2 and the resistor R1 and the GND pin of the LED driving chip LT1937 are grounded.

Example 2

As shown in fig. 4, in the present embodiment, the LED driving circuit includes an LED driving chip LT3491, a voltage source V1, capacitors C1, C3, an inductor L1, and a resistor R1, the voltage conversion circuit includes a resistor R2, and the LED light source includes light emitting diodes D1-D4.

The Vin pin of the LED driving chip LT3491 is coupled to the positive electrode of the voltage source V1 and one end of the capacitor C1 and the inductor L1, the SW pin is coupled to the other end of the inductor L1, and the Cap pin is coupled to one end of the resistor R1 and one end of the capacitor C3; the resistor R2 is coupled in parallel to the output end of the illuminance sensor, and has a first end coupled to the CTRL pin of the LED driver chip LT3491 and a second end grounded; the light emitting diodes D1-D4 are sequentially coupled in series in the same direction, and the anode of the diode D1 is coupled with the LED pin of the LED driving chip LT3491 and the other end of the resistor R1; the negative electrode of the voltage source V1, the other ends of the capacitors C1 and C3, the negative electrode of the diode D4 and the GND pin of the LED driving chip LT3491 are grounded.

Example 3

As shown in fig. 5, in the embodiment, the LED driving circuit includes an LED driving chip LT3486, a voltage source V1, capacitors C1-C4, an inductor L1, a schottky diode D7, and resistors R1-R3, the voltage converting circuit includes a resistor R4, and the LED light source includes light emitting diodes D1-D6.

The pin Vin, the pin SHDN and the pin PWM1 of the LED driving chip LT3486 are coupled to the anode of the voltage source V1 and one end of the capacitor C1 and one end of the inductor L1, the pin SW1 is coupled to the other end of the inductor L1 and one end of the schottky diode D7, and the pin REF is coupled to one end of the capacitor C4; the resistor R4 is coupled in parallel to the output end of the illuminance sensor, and has a first end coupled to the CTRL1 pin of the LED driver chip LT3486 and a second end grounded; the light emitting diodes D1-D6 are sequentially coupled in series in the same direction, the anode of the diode D2 is coupled with the other end of the Schottky diode D7, the OVP1 pin of the LED driving chip LT3486 and one end of the capacitor C2, and the cathode of the diode D6 is coupled with the FB1 pin of the LED driving chip LT3486 and one end of the resistor R3; the negative electrode of the voltage source V1, the other ends of the capacitors C1, C2 and C4 and the resistor R3 and the GND pin of the LED driving chip LT3486 are grounded; the pin Vc1 of the LED driving chip LT3486 is grounded through a resistor R1 and a capacitor C3, and the pin Rt of the LED driving chip LT3486 is grounded through a resistor R2.

In the above embodiments, LT1937, LT3491 and LT3486 are constant current LED driving chips capable of adjusting output current by using DC voltage, and the output current can be changed by connecting a variable voltage to the CTRL pin. The light intensity sensor (i.e. the current source I1) and the resistor R form a loop to be connected to the CTRL pin, when the external light intensity changes, the current of I1 changes, the voltage on the CTRL pin changes accordingly, which causes the current of the LED to change, thereby realizing the function of adaptively changing the output light intensity of the LED along with the change of the external light intensity.

Fig. 6 shows a relationship curve between the output current of the LED driving circuit and the photocurrent of the illuminance sensor in the above embodiment, which is obtained by software simulation. The graph simulates that in the process of changing the intensity of the external light from the maximum intensity to 0 in the evening, the current of the illuminance sensor is reduced along with the reduction of the intensity of the external light and is changed from 24mA to 0. At this time, the output current of the LED driving circuit automatically increases as the current of the illuminance sensor decreases, and the current changes from 0 to 19mA, that is, the light emitted by the LED becomes brighter and brighter to compensate for the darker and darker ambient light, thereby automatically realizing constant illumination of the environment.

As a further preferred implementation, in the above embodiment, the resistor of the voltage conversion circuit, that is, the resistor coupled in parallel to the output end of the illuminance sensor, is an adjustable resistor, so that a user can flexibly set the target illuminance value by adjusting the value of the resistor in the voltage conversion circuit according to different use requirements or use occasions.

Fig. 7 shows the effect of the magnitude of the resistance in the voltage conversion circuit on the lighting system, which is obtained by software simulation. In embodiment 1, when the resistor R4 in the voltage conversion circuit is 2 ohms, the current output by the LED driving circuit changes from 0 to 19mA as the external light intensity decreases, i.e., as the light current of the illuminance sensor decreases, as shown by the dotted line in fig. 7; when the resistor R4 in the voltage conversion circuit is 1 ohm, the current output by the LED driving circuit changes from 0 to 32mA as the external light intensity decreases, i.e., as the light current of the illuminance sensor decreases, as shown by the solid line in fig. 7.

Fig. 7 shows that, under the same external illuminance, when the resistance in the voltage conversion circuit is decreased, the output current of the LED driving circuit is larger than the original current, i.e., the LED is brighter than the original current, i.e., the overall ambient illuminance is higher than the original ambient illuminance, so that the user can flexibly set the target illuminance value by adjusting the value of the resistance in the voltage conversion circuit according to different use requirements or use occasions, thereby making the system more humanized.

The above description of the embodiments is only intended to help understand the method of the present invention and its core ideas. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. An LED illumination system capable of adaptively adjusting light according to ambient illumination is characterized by comprising an illumination sensor, a voltage conversion circuit coupled with the illumination sensor, an LED driving circuit coupled with the voltage conversion circuit, and an LED light source coupled with the LED driving circuit; the LED light source comprises an illumination sensor, a voltage conversion circuit, an LED drive circuit and an LED light source, wherein the illumination sensor outputs a photocurrent in a proportional relation with the illumination intensity received by a receiving surface of the illumination sensor, the voltage conversion circuit converts the photocurrent output by the illumination sensor into a voltage changing along with the illumination intensity, and the LED drive circuit adjusts the output current of the LED drive circuit based on the voltage so as to control the brightness of the LED light source.

2. The LED illumination system of claim 1, wherein the illuminance sensor optionally comprises a photo-transistor, a photomultiplier tube, a PIN-tube, or an avalanche photodiode.

3. The LED lighting system adapted to illuminate according to ambient illuminance according to claim 2, wherein the LED driving circuit comprises an LED driving chip LT1937, a voltage source V1, capacitors C1, C2, an inductor L1, resistors R1-R3, and a Schottky diode D1, the voltage conversion circuit comprises a resistor R4, the LED light source comprises light emitting diodes D2-D4; the Vin pin and the SHDN pin of the LED driving chip LT1937 are coupled to the anode of the voltage source V1, the capacitor C2 and one end of the inductor L1, the SW pin is coupled to the other end of the inductor L1 and one end of the schottky diode D1, and the FB pin is coupled between the series resistors R2 and R3; the resistor R4 is coupled in parallel to the output end of the illuminance sensor, and has a first end coupled to the other end of the resistor R3 and a second end grounded; the light emitting diodes D2-D4 are sequentially coupled in series in the same direction, the anode of the diode D2 is coupled to the other end of the schottky diode D1 and one end of the capacitor C1, and the cathode of the diode D4 is coupled to the other end of the resistor R2 and one end of the resistor R1; the negative electrode of the voltage source V1, the other ends of the capacitors C1 and C2 and the resistor R1 and the GND pin of the LED driving chip LT1937 are grounded.

4. The LED lighting system adapted to adjust the light according to the ambient illuminance according to claim 2, wherein the LED driving circuit comprises an LED driving chip LT3491, a voltage source V1, a capacitor C1, C3, an inductor L1, a resistor R1, the voltage conversion circuit comprises a resistor R2, the LED light source comprises light emitting diodes D1-D4; the Vin pin of the LED driving chip LT3491 is coupled to the positive electrode of the voltage source V1 and one end of the capacitor C1 and the inductor L1, the SW pin is coupled to the other end of the inductor L1, and the Cap pin is coupled to one end of the resistor R1 and one end of the capacitor C3; the resistor R2 is coupled in parallel to the output end of the illuminance sensor, and has a first end coupled to the CTRL pin of the LED driver chip LT3491 and a second end grounded; the light emitting diodes D1-D4 are sequentially coupled in series in the same direction, and the anode of the diode D1 is coupled with the LED pin of the LED driving chip LT3491 and the other end of the resistor R1; the negative electrode of the voltage source V1, the other ends of the capacitors C1 and C3, the negative electrode of the diode D4 and the GND pin of the LED driving chip LT3491 are grounded.

5. The LED lighting system adapted to adjust the light according to the ambient illuminance according to claim 2, wherein the LED driving circuit comprises an LED driving chip LT3486, a voltage source V1, capacitors C1-C4, an inductor L1, a Schottky diode D7 and resistors R1-R3, the voltage conversion circuit comprises a resistor R4, and the LED light source comprises light emitting diodes D1-D6; the pin Vin, the pin SHDN and the pin PWM1 of the LED driving chip LT3486 are coupled to the anode of the voltage source V1 and one end of the capacitor C1 and one end of the inductor L1, the pin SW1 is coupled to the other end of the inductor L1 and one end of the schottky diode D7, and the pin REF is coupled to one end of the capacitor C4; the resistor R4 is coupled in parallel to the output end of the illuminance sensor, and has a first end coupled to the CTRL1 pin of the LED driver chip LT3486 and a second end grounded; the light emitting diodes D1-D6 are sequentially coupled in series in the same direction, the anode of the diode D2 is coupled with the other end of the Schottky diode D7, the OVP1 pin of the LED driving chip LT3486 and one end of the capacitor C2, and the cathode of the diode D6 is coupled with the FB1 pin of the LED driving chip LT3486 and one end of the resistor R3; the negative electrode of the voltage source V1, the other ends of the capacitors C1, C2 and C4 and the resistor R3 and the GND pin of the LED driving chip LT3486 are grounded; the pin Vc1 of the LED driving chip LT3486 is grounded through a resistor R1 and a capacitor C3, and the pin Rt of the LED driving chip LT3486 is grounded through a resistor R2.

6. An LED lighting system adaptive to light modulation according to ambient illuminance according to any one of claims 3 to 5, wherein the resistor in the voltage conversion circuit is an adjustable resistor.