CN109041325B

CN109041325B - LED lighting system, LED color temperature and brightness adjusting method and readable storage medium

Info

Publication number: CN109041325B
Application number: CN201810606998.8A
Authority: CN
Inventors: 王安; 李胜
Original assignee: Shanghai Yaming Lighting Co Ltd
Current assignee: Shanghai Yaming Lighting Co Ltd
Priority date: 2018-06-13
Filing date: 2018-06-13
Publication date: 2024-05-10
Anticipated expiration: 2038-06-13
Also published as: CN109041325A

Abstract

The invention provides an LED lighting system, an LED color temperature and brightness adjusting method and a readable storage medium, wherein a common middle color temperature is arranged on a main line in the LED lighting system, a method for mixing colors (or color temperatures) of common centroids of color point coordinates of different extreme colors (or color temperatures) in an LED lamp is provided instead of a conventional simple color mixing method among a plurality of extreme color point coordinates, and a logic device is added in a control circuit to realize complete separation of different color temperature adjustment and different brightness adjustment, so that the utilization rate of LED lamp beads is improved, the number of the lamp beads is saved, the degradation cost is reduced, the power is constant, and the color temperature conversion is smooth. The color temperature adjustment and the brightness adjustment are mutually independent, so that the brightness control is simpler and more convenient, and the device can be used for carrying out man-machine interaction operation with the back-end dimming and color mixing application.

Description

LED lighting system, LED color temperature and brightness adjusting method and readable storage medium

Technical Field

The present invention relates to LED lighting and a method for adjusting the same, and more particularly, to an LED lighting system and a method for adjusting color temperature and brightness thereof.

Background

Compared with the traditional incandescent lamp, fluorescent lamp, high-pressure sodium lamp or metal halogen lamp, the LED lamp has the advantages of high light efficiency, long service life, more environment friendliness and the like, and is widely applied to various indoor and outdoor environments, on one hand, the LED lamp is developed at a high speed, the light efficiency is higher and higher, and the electricity saving rate is higher and higher; in another more important aspect, the LED lamp is easier to control, different color-mixing dimming modes are utilized, and the LED lamp is easy to integrate into intelligent illumination of the Internet of things by utilizing a certain communication mode, such as smart cities, smart home and the like.

The intelligent adjustment of the LED lamp is concentrated on the switch, the color or the color temperature, and the brightness, and the adjustment of the color of the LED is very similar to the adjustment of the color temperature, and the adjustment of the color of the LED is the accumulation of different proportions among different color point coordinates in a chromaticity diagram. In fact, in many applications, such as some street lamps, warm color light (low color temperature) is required to appear in winter and cold color light (high color temperature) is required to appear in summer, that is, adjustment is performed between the two color temperatures. The conventional method only needs to design two loops for two required extreme color temperatures, the gray values of the color point coordinates corresponding to the two color temperatures are adjusted according to different currents to realize a certain intermediate color temperature, in the practical process of the various traditional schemes, the power output of the practical lamp is only half of the power output of all LED lamp beads, namely the utilization rate of the lamp beads is only half, the different color ratios are wasted in plant illumination and landscape illumination, the cost is high, for example, a certain lamp needs to adjust the color temperature between 3000K and 5000K, and only half of energy is utilized at any moment.

In addition, if two loops are used for independent dimming, a certain lamp needs to be subjected to color temperature adjustment between 3000K and 5000K, so that the energy in the middle color point can be maximized, the utilization rate of the whole LED lamp beads is improved, but the fluctuation of the luminous flux of the lamp is too large due to the fact that the whole lamp is not constantly powered in the process of adjusting the color, the color temperature is not smooth in transformation, the brightness is inconsistent, and the comfort is poor.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention is to provide an LED lighting system, an LED color temperature and brightness adjustment method, and a storable medium, which are used for solving the problems of low utilization rate or non-constant power in color temperature adjustment of the existing LED lighting system, and simultaneously solving the problems of independent color temperature adjustment and brightness adjustment, saving lamp beads, and reducing degradation cost.

To achieve the above and other related objects, the present invention provides an LED lighting system comprising: the LED lamp comprises a power supply module, a first LED lamp group, a second LED lamp group, a third LED lamp group, a first switch circuit, a second switch circuit and a communication control module; wherein the first LED lamp group, the second LED lamp group and the third LED lamp group are of different colors; the power module includes: the control end, the positive electrode output end and the negative electrode output end, wherein the positive electrode output end is connected with one end of the first LED lamp group; the other end of the first LED lamp group is connected with one end of the second LED lamp group and one end of the third LED lamp group respectively; the first switch circuit comprises a first end connected with the other end of the second LED lamp group, a second end connected with the negative output end of the power supply module and a third end, and the third end is used for controlling the conduction between the first end and the second end; the second switch circuit comprises a fourth end connected with the other end of the third LED lamp group, a fifth end connected with the negative output end of the power supply module and a sixth end, and the sixth end is used for controlling the conduction between the fourth end and the fifth end; the communication control module includes: a first signal output terminal and a second signal output terminal; the first signal output end is connected with the control end of the power supply module and is used for outputting a brightness adjusting signal to adjust the power supply output of the power supply module; the second signal output end is coupled to the third end and the sixth end and is used for outputting a color temperature adjusting signal; under the condition that the color temperature adjusting signal is not output by the second signal output end, the first switch circuit and the second switch circuit are conducted so that the second LED lamp group and the third LED lamp group are communicated with the negative electrode output end of the power supply module; and under the condition that the second signal output end outputs the color temperature adjusting signal, the first switch circuit or the second switch circuit is conducted so as to enable the second LED lamp group or the third LED lamp group to be communicated with the negative electrode output end of the power supply module.

In an embodiment of the present invention, a logic device is further connected between the third end of the first switch circuit or the sixth end of the second switch circuit and the second signal output end; the logic device is used for outputting an opposite signal to the third end or the sixth end according to the color temperature adjusting signal so as to conduct the first switch circuit or the second switch circuit.

In one embodiment of the present invention, the logic device is an inverter.

In an embodiment of the invention, the first switching circuit includes: the first resistor comprises a first field effect transistor, a first triode, a first resistor and a second resistor; the drain electrode of the first field effect transistor is electrically connected with the other end of the second LED lamp set; the source electrode of the first field effect transistor is electrically connected with the negative output end of the power supply module; the grid electrode of the first field effect transistor is respectively and electrically connected with one end of the first resistor and the collector electrode of the first triode; the other end of the first resistor is connected with a power supply anode; the emitter of the first triode is connected with the negative electrode of a power supply; the base electrode of the first triode is electrically connected with one end of the second resistor; the other end of the second resistor is electrically connected with the second signal output end.

In an embodiment of the invention, the second switching circuit includes: the second FET, the second triode, the third resistor and the fourth resistor; the drain electrode of the second field effect transistor is electrically connected with the other end of the third LED lamp set; the source electrode of the second field effect transistor is electrically connected with the negative electrode output end of the power supply module; the grid electrode of the second field effect transistor is respectively and electrically connected with one end of the third resistor and the collector electrode of the second triode; the other end of the third resistor is connected with a power supply anode; the emitter of the second triode is connected with the negative electrode of a power supply; the base electrode of the second triode is electrically connected with one end of the fourth resistor; and the other end of one end of the fourth resistor is electrically connected with the second signal output end.

In an embodiment of the invention, the power module includes: an AC/DC power supply, and a DC/DC power supply; the AC/DC power supply is used for accessing alternating current and outputting direct current; the DC/DC power supply is used for accessing direct current and outputting the direct current; the positive output end of the AC/DC power supply is electrically connected with the positive input end of the DC/DC power supply; the negative output end of the AC/DC power supply is electrically connected with the negative input end of the DC/DC power supply; the positive electrode output end and the negative electrode output end of the AC/DC power supply are electrically connected with the power interface of the communication control module; or the positive electrode output end of the DC/DC power supply and the negative electrode of the output end are electrically connected with the power interface of the communication control module.

In an embodiment of the invention, the first switching circuit includes: the first resistor comprises a first field effect transistor, a first triode, a first resistor and a second resistor; the drain electrode of the first field effect transistor is electrically connected with the other end of the second LED lamp set; the source electrode of the first field effect transistor is electrically connected with the negative electrode of the output end of the power supply module; the grid electrode of the first field effect transistor is respectively and electrically connected with one end of the first resistor and the collector electrode of the first triode; the other end of the first resistor is connected with a power supply anode; the emitter of the first triode is connected with the negative electrode of a power supply; the base electrode of the first triode is electrically connected with one end of the second resistor; the other end of the second resistor is electrically connected with a second signal output end of the communication control module; the second switching circuit includes: the second FET, the second triode, the third resistor, the fourth resistor and the inverter; the drain electrode of the second field effect transistor is electrically connected with the other end of the third LED lamp set; the source electrode of the second field effect transistor is electrically connected with the negative electrode of the output end of the power supply module; the grid electrode of the second field effect transistor is respectively and electrically connected with one end of the third resistor and the collector electrode of the second triode; the other end of the third resistor is connected with a power supply anode; the emitter of the second triode is connected with the negative electrode of a power supply; the base electrode of the second triode is electrically connected with one end of the fourth resistor; the other end of the fourth resistor is electrically connected with the second signal output end of the communication control module; the power supply anode can be the AC/DC power supply anode or the DC/DC power supply anode; the power supply negative electrode may be the AC/DC power supply negative electrode or the DC/DC power supply negative electrode.

In an embodiment of the invention, the positive output end of the power module and the other end of the second LED lamp set are also connected with a first capacitor; and the positive output end of the power supply module and the other end of the third LED lamp group are also connected with a second capacitor.

In an embodiment of the invention, the first LED lamp set, the second LED lamp set, and the third LED lamp set are respectively formed by connecting a plurality of lamp beads in series.

In an embodiment of the invention, the colors of the first LED lamp set, the second LED lamp set and the third LED lamp set are yellow, red and green, respectively.

In an embodiment of the invention, the brightness adjustment signal and the color temperature adjustment signal are PWM signals.

To achieve the above and other related objects, the present invention provides a method for adjusting color temperature of an LED, which is applied to the LED lighting system, and the method includes: receiving a color temperature adjusting instruction; sending a PWM color temperature adjusting signal; and controlling the change of the on or off state of the first switch circuit or the second switch circuit through the PWM color temperature adjusting signal so as to control the on time of the second LED lamp group or the third LED lamp group and realize light mixing.

In an embodiment of the invention, the first LED lamp set, the second LED lamp set, and the third LED lamp set respectively require the least number of LED lamp beads, and are calculated by using a color temperature mixing algorithm from the color temperature corresponding to CIE point coordinate position, the original color temperature corresponding to CIE coordinate position, and the color temperature corresponding to CIE point coordinate position.

To achieve the above and other related objects, the present invention provides a method for adjusting LED brightness, which is applied to the LED lighting system, and the method includes: receiving a brightness adjusting instruction; sending a PWM brightness adjustment signal; and adjusting the output current of the AC/DC power supply through the PWM dimming signal so as to obtain different brightness.

To achieve the above and other related objects, the present invention provides a computer-readable storage medium having stored thereon a computer program, wherein the program when executed by a processor implements the LED color temperature adjustment method or implements the LED brightness adjustment method.

As described above, according to the LED lighting system, the LED color temperature and brightness adjustment method and the readable storage medium of the present invention, by setting the common intermediate color temperature in the main line of the LED lighting system, the method of color (or color temperature) mixing the common centroid of the color point coordinates of different extreme colors (or color temperatures) in the LED lamp is performed, instead of the conventional simple color mixing method between the plurality of extreme color point coordinates, and meanwhile, the logic device is added in the control line, so as to realize complete separation of different color temperature adjustment and different brightness adjustment. The following beneficial effects are achieved:

The LED lamp bead utilization rate is improved, the number of lamp beads is saved, the degradation cost is reduced, meanwhile, the power is constant, and the color temperature conversion is smooth. The color temperature adjustment and the brightness adjustment are mutually independent, so that the brightness control is simpler and more convenient, and the device can be used for carrying out man-machine interaction operation with the back-end dimming and color mixing application.

Drawings

FIG. 1 is a schematic block diagram of an LED lighting system according to an embodiment of the present invention;

FIG. 2 is a schematic circuit diagram of an LED lighting system according to an embodiment of the present invention;

fig. 3 is a flow chart of a method for adjusting color temperature of an LED according to an embodiment of the present invention;

fig. 4 is a flowchart of a method for adjusting LED brightness according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of simulated point cloud distribution in an embodiment of the present invention.

Description of element reference numerals

100 LED illumination system

101. Power supply module

102. First LED lamp group

103. Second LED lamp group

104. Third LED lamp group

105. First switch circuit

106. Second switching circuit

107. Communication control module

201 AC/DC power supply

202 DC/DC power supply

203. Communication control module

LED1 first LED lamp group

LED2 second LED lamp group

LED3 third LED lamp group

Q1 first field effect transistor

Q2 second field effect transistor

Q3 first triode

Q4 second triode

C1 First capacitor

C2 Second capacitor

R1 first resistor

R2 second resistor

R3 third resistor

R4 fourth resistor

F-phase inverter

S301 to S303 method steps

S401-S403 method steps

Detailed Description

Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.

It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.

As shown in fig. 1, a schematic block diagram of an LED lighting system according to an embodiment of the present invention is shown, and the present invention provides an LED lighting system 100, including: a power supply module 101, a first LED lamp group 102, a second LED lamp group 103, a third LED lamp group 104, a first switch circuit 105, a second switch circuit 106, and a communication control module 107; wherein the first LED lamp set 102, the second LED lamp set 103, and the third LED lamp set 104 are different colors; the power module 101 includes: the control end, the positive electrode output end and the negative electrode output end, wherein the positive electrode output end is connected with one end of the first LED lamp group 102; the other end of the first LED lamp set 102 is connected with one end of the second LED lamp set 103 and one end of the third LED lamp set 104 respectively; the first switch circuit 105 includes a first end connected to the other end of the second LED lamp set 103, a second end connected to the negative output end of the power module 101, and a third end, where the third end is used to control the conduction between the first end and the second end; the second switch circuit 106 includes a fourth end connected to the other end of the third LED lamp set 104, a fifth end connected to the negative output end of the power module 101, and a sixth end, where the sixth end is used to control the conduction between the fourth end and the fifth end; the communication control module 107 includes: a first signal output terminal and a second signal output terminal; the first signal output end is connected with the control end of the power module 101 and is used for outputting a brightness adjusting signal to adjust the power output of the power module 101; the second signal output end is coupled to the third end and the sixth end and is used for outputting a color temperature adjusting signal; wherein, when the second signal output end does not output the color temperature adjusting signal, the first switch circuit 105 and the second switch circuit 106 are turned on, so that the second LED lamp set 103 and the third LED lamp set 104 are communicated with the negative output end of the power module 101; when the second signal output end outputs the color temperature adjusting signal, the first switch circuit 105 or the second switch circuit 106 is turned on, so that the second LED lamp set 103 or the third LED lamp set 104 is communicated with the negative output end of the power module 101.

The power module 101 is externally connected with commercial power, and is generally 100-240V ac.

The communication control module 107 includes a microprocessor, a communicator, and a memory; the microprocessor is used for sending PWM signals and running programs to realize the adjustment of the color temperature and the brightness of the LEDs; the communicator is in communication connection with external equipment; the memory stores a program.

The external equipment comprises terminal equipment such as a smart phone, a tablet personal computer, a desktop computer and the like.

The microprocessor is a central processing unit composed of one or a few large-scale integrated circuits. These circuits perform the functions of control means and arithmetic logic means. The microprocessor can complete the operations of fetching instructions, executing instructions, exchanging information with the external memory and the logic component, and the like, and is an operation control part of the microcomputer. It can be combined with memory and peripheral circuit chip into microcomputer.

The communicator is configured to enable a communication connection between the database access apparatus and other devices (e.g., clients, read-write libraries, and read-only libraries) that may be in any suitable combination of one or more wired and/or wireless networks. For example, the communication means may include any one or more of the internet of things, the internet, an intranet, a Wide Area Network (WAN), a Local Area Network (LAN), a wireless network, a Digital Subscriber Line (DSL) network, a frame relay network, an Asynchronous Transfer Mode (ATM) network, a Virtual Private Network (VPN), and/or any other suitable communication network.

The memory may comprise Random Access Memory (RAM) or may further comprise non-volatile memory (non-volatilememory), such as at least one disk memory.

In an embodiment of the present invention, a logic device is further connected between the third end of the first switch circuit 105 or the sixth end of the second switch circuit 106 and the second signal output end; the logic device is configured to output an opposite signal to the third end or the sixth end according to the color temperature adjustment signal, so that the first switch circuit 105 or the second switch circuit 106 is turned on.

The logic device includes any device capable of outputting an opposite signal to turn on the first switching circuit 105 or the second switching circuit 106.

As shown in fig. 2, a schematic circuit diagram of an LED lighting system according to an embodiment of the present invention is shown, and in an embodiment of the present invention, the logic device is an inverter F.

The inverter F is a circuit capable of inverting the phase of an input signal by 180 degrees, and such a circuit is applied to an analog circuit such as audio amplification, a clock oscillator, and the like. In electronic circuit design, inverters are often used, and a CMOS inverter circuit is composed of two enhancement type MOS field effect transistors. A typical TTL NAND gate consists of an input stage, an intermediate stage and an output stage.

In an embodiment of the present invention, the first switch circuit 105 includes: the first transistor Q1, the first triode Q3, the first resistor R1 and the second resistor R2; the drain electrode of the first field effect tube Q1 is electrically connected with the other end of the second LED lamp group LED 2; the source electrode of the first field effect transistor Q1 is electrically connected with the negative output end of the power module 101; the grid electrode of the first field effect transistor Q1 is respectively and electrically connected with one end of the first resistor R1 and the collector electrode of the first triode Q3; the other end of the first resistor R1 is connected with a power supply anode; the emitter of the first triode Q3 is connected with the negative electrode of a power supply; the base electrode of the first triode Q3 is electrically connected with one end of the second resistor R2; the other end of the second resistor R2 is electrically connected with the second signal output end.

In an embodiment of the present invention, the second switching circuit 106 includes: the second FET Q2, the second triode Q4, the third resistor R3 and the fourth resistor R4; the drain electrode of the second field effect transistor Q2 is electrically connected with the other end of the third LED lamp group LED 3; the source electrode of the second field effect transistor Q2 is electrically connected with the negative output end of the power module 101; the grid electrode of the second field effect transistor Q2 is respectively and electrically connected with one end of the third resistor R3 and the collector electrode of the second triode Q4; the other end of the third resistor R3 is connected with a power supply anode; the emitter of the second triode Q4 is connected with the negative electrode of a power supply; the base electrode of the second triode Q4 is electrically connected with one end of the fourth resistor R4; and the other end of one end of the fourth resistor R4 is electrically connected with the second signal output end.

In the embodiment of the present invention, the types of the field effect transistors and the triode in the first switch circuit 105 and the second switch circuit 106 are the same, and under the condition that the color temperature adjusting signal is output from the second signal output end, the first switch circuit 105 or the second switch circuit 106 is turned on by means of an inverter, that is, one switch circuit is selected to realize the output of the opposite signal, so that the second LED lamp set 103 or the third LED lamp set 104 is communicated with the negative output end of the power module 101.

Based on the above object, the present invention further includes another embodiment, including: an emitter of the first triode Q3 in the first switch circuit 105 is electrically connected with a gate of the first field effect tube Q1; the collector electrode of the first triode Q3 is connected with the negative electrode of a power supply; the collector of the second triode Q4 in the second switch 106 is electrically connected to the gate of the second field effect transistor Q2; and the emitter of the second triode Q4 is connected with a power supply cathode.

In the other embodiment, the connection mode of the emitter and the collector of the triode in one path of switching circuit and the emitter and the collector of the triode in the other path of switching circuit is opposite, so as to realize the function of replacing the inverter.

In one mode, two switching circuits select the same type of triode, and the emitter and the collector of one triode are connected in a switching mode; or the two switch circuits select the transistors of opposite types, and the emitter is electrically connected with the grid electrode of the field effect transistor; the collector electrode is connected with a power negative electrode.

In an embodiment of the present invention, the power module 101 includes: an AC/DC power supply 201, and a DC/DC power supply 202; the AC/DC power supply 201 is configured to access an alternating current and output a direct current; the DC/DC power supply 202 is configured to access direct current and output direct current; the positive output end of the AC/DC power supply 201 is electrically connected with the positive input end of the DC/DC power supply 202; the negative output end of the AC/DC power supply 201 is electrically connected with the negative input end of the DC/DC power supply 202; the positive electrode output end and the negative electrode output end of the AC/DC power supply 201 are electrically connected with the power interface of the communication control module 203; or the positive output end of the DC/DC power supply 202 and the negative output end of the DC/DC power supply are electrically connected with the power interface of the communication control module 203.

The voltage range of the output end of the AC/DC power supply 201 is preferably 30-42V, and the current is preferably 1A.

The output voltage range of the DC/DC power supply 202 is preferably 3.3V or 5V or 10V.

In an embodiment of the present invention, the first switch circuit 105 includes: the first transistor Q1, the first triode Q3, the first resistor R1 and the second resistor R2; the drain electrode of the first field effect tube Q1 is electrically connected with the other end of the second LED lamp group LED 2; the source electrode of the first field effect transistor Q1 is electrically connected with the negative output end of the power module 101; the grid electrode of the first field effect transistor Q1 is respectively and electrically connected with one end of the first resistor R1 and the collector electrode of the first triode Q3; the other end of the first resistor R1 is connected with a power supply anode; the emitter of the first triode Q3 is connected with the negative electrode of a power supply; the base electrode of the first triode Q3 is electrically connected with one end of the second resistor R2; the other end of the second resistor R2 is electrically connected with the second signal output end; the second switching circuit 106 includes: the second FET Q2, the second triode Q4, the third resistor R3 and the fourth resistor R4; the drain electrode of the second field effect transistor Q2 is electrically connected with the other end of the third LED lamp group LED 3; the source electrode of the second field effect transistor Q2 is electrically connected with the negative output end of the power module 101; the grid electrode of the second field effect transistor Q2 is respectively and electrically connected with one end of the third resistor R3 and the collector electrode of the second triode Q4; the other end of the third resistor R3 is connected with a power supply anode; the emitter of the second triode Q4 is connected with the negative electrode of a power supply; the base electrode of the second triode Q4 is electrically connected with one end of the fourth resistor R4; the other end of one end of the fourth resistor R4 is electrically connected with the second signal output end; the power supply positive electrode can be the positive electrode of the AC/DC power supply 201 or the positive electrode of the DC/DC power supply 202; the negative power supply may be the negative of the AC/DC power supply 201 or the negative of the DC/DC power supply 202.

The power supply anode can also be a power supply unit anode which is independently arranged in the LED lighting system, and the power supply cathode can also be a power supply unit cathode which is independently arranged in the LED lighting system.

In an embodiment of the invention, a first capacitor C1 is further connected to the positive output end of the power module 101 and the other end of the second LED lamp set LED 2; the positive output end of the power module 101 and the other end of the third LED lamp set LED3 are also connected with a second capacitor C2.

The first capacitor C1 and the second capacitor C2 mainly play roles in filtering and surge impact prevention in a circuit.

In an embodiment of the invention, the first LED lamp set 102, the second LED lamp set 103, and the third LED lamp set 104 are respectively formed by connecting a plurality of lamp beads in series.

The lamp beads are light-emitting diodes.

In an embodiment of the present invention, the colors of the first LED lamp set 102, the second LED lamp set 103, and the third LED lamp set 104 are yellow, red, and green, respectively.

The lamp sets are different in color to achieve a variety of variations in color adjustment.

The PWM signal is a pulse width modulation signal, and is a pulse waveform signal with a variable duty ratio.

As shown in fig. 3, a flow chart of a method for adjusting color temperature of an LED according to an embodiment of the present invention is shown, and the method is applied to the LED lighting system, and includes:

step S301: and receiving a color temperature adjusting instruction.

Step S302: and sending a PWM color temperature adjusting signal.

Step S303: and controlling the change of the on or off state of the first switch circuit 105 or the second switch circuit 106 through the PWM color temperature adjusting signal so as to control the on time of the second LED lamp group 103 or the third LED lamp group 104, thereby realizing light mixing.

The instruction for receiving and adjusting the color temperature can be sent by external equipment, such as a mobile phone terminal or a computer terminal.

The ratio of the currents flowing through the first regulating circuit 105 to the second regulating circuit 106 is regulated through the change of the duty ratio in the PWM color mixing signal so as to obtain different mixed color temperatures; the current ratio is determined by the ratio of the point coordinate position corresponding to the color temperature to be mixed to the distance between the original color temperature coordinate position of the second LED lamp set 103 and the original color temperature coordinate position of the third LED lamp set 104.

In an embodiment of the present invention, the first LED lamp set 102, the second LED lamp set 103, and the third LED lamp set 104 respectively require the minimum number of LED lamp beads, and are calculated by using a color temperature mixing algorithm from the color temperature corresponding to CIE point coordinate position, the original color temperature corresponding to CIE coordinate position of the first LED lamp set 102, the original color temperature corresponding to CIE coordinate position of the second LED lamp set 103, the original color temperature corresponding to CIE coordinate position of the third LED lamp set 104, and the color temperature corresponding to CIE point coordinate position of each LED lamp set to more point coordinate positions on the reverse extension line of the original color temperature corresponding to the CIE coordinate position.

The color temperature mixing algorithm is based on the existing color temperature mixing basic principle:

-LED1: color point 1 (x 1, y 1), luminous flux Φ1

LED2: color point 2 (x 2, y 2), luminous flux Φ2

–X,Y and Z

·X1＝x1*(Φ1/y1)；Y1＝Φ1；Z1＝(Φ1/y1)*(1-x1-y1)

·X2＝x2*(Φ2/y2)；Y2＝Φ2；Z2＝(Φ2/y2)*(1-x2-y2)

Color mixing:

·Xmix＝X1+X2；Ymix＝Y1+Y2and Zmix＝Z1+Z2

final coordinates and CCT:

·xmix＝Xmix/(Xmix+Ymix+Zmix)

·ymix＝Ymix/(Xmix+Ymix+Zmix)

·Φmix＝Y1+Y2

·n＝(x-0.3320)/(0.1858-y)

·CCT＝437*n^3+3601*n^2+6831*n+5517

in the formula, n represents an intermediate coefficient of color coordinate conversion into color temperature.

The CCT is an acronym english correlated color temperature, and when the color of light emitted by a light source is close to the color radiated by a black body at a certain temperature, the temperature of the black body is called the correlated color temperature of the light source, and the unit is K.

As shown in fig. 4, a flow chart of a method for adjusting LED brightness according to an embodiment of the present invention is shown, and is applied to the LED lighting system, where the method includes:

Step S401: and receiving a brightness adjusting instruction.

Step S402: a PWM brightness adjustment signal is sent.

Step S403: and adjusting the output current of the AC/DC power supply through the PWM dimming signal so as to obtain different brightness.

The brightness of the LED is mainly determined by the current on the main circuit, namely, the independent duty ratio of the PWM dimming signal.

Fig. 5 shows a schematic diagram of simulated point cloud distribution according to an embodiment of the invention, which is applied to the LED lighting system. The method comprises the steps of randomly distributing proper color point coordinates by utilizing a central value, a long axis, a short axis and the like of a given color temperature distribution ellipse through a Monte Carlo algorithm, obtaining color point coordinate distribution of color temperature after mixing under a certain duty ratio after mixing a main line intermediate value and two auxiliary line color temperature values, obtaining point cloud distribution through simulation, and calculating a color temperature area conforming to actual requirements.

The computer-readable storage medium, as will be appreciated by one of ordinary skill in the art: all or part of the steps for implementing the method embodiments described above may be performed by computer program related hardware. The aforementioned computer program may be stored in a computer readable storage medium. The program, when executed, performs steps including the method embodiments described above; and the aforementioned storage medium includes: various media that can store program code, such as ROM, RAM, magnetic or optical disks.

In summary, the present invention effectively overcomes the disadvantages of the prior art and has high industrial utility value.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. An LED lighting system, comprising:

the LED lamp comprises a power supply module, a first LED lamp group, a second LED lamp group, a third LED lamp group, a first switch circuit, a second switch circuit and a communication control module; wherein the first LED lamp group, the second LED lamp group and the third LED lamp group are of different colors;

The power module includes: the control end, the positive electrode output end and the negative electrode output end, wherein the positive electrode output end is connected with one end of the first LED lamp group;

the other end of the first LED lamp group is connected with one end of the second LED lamp group and one end of the third LED lamp group respectively;

the first switch circuit comprises a first end connected with the other end of the second LED lamp group, a second end connected with the negative output end of the power supply module and a third end, and the third end is used for controlling the conduction between the first end and the second end;

the second switch circuit comprises a fourth end connected with the other end of the third LED lamp group, a fifth end connected with the negative output end of the power supply module and a sixth end, and the sixth end is used for controlling the conduction between the fourth end and the fifth end;

the communication control module includes: a first signal output terminal and a second signal output terminal; the first signal output end is connected with the control end of the power supply module and is used for outputting a brightness adjusting signal to adjust the power supply output of the power supply module;

the second signal output end is coupled to the third end and the sixth end and is used for outputting a color temperature adjusting signal;

Under the condition that the color temperature adjusting signal is not output by the second signal output end, the first switch circuit and the second switch circuit are conducted so that the second LED lamp group and the third LED lamp group are communicated with the negative electrode output end of the power supply module; and under the condition that the second signal output end outputs the color temperature adjusting signal, the first switch circuit or the second switch circuit is conducted so as to enable the second LED lamp group or the third LED lamp group to be communicated with the negative electrode output end of the power supply module.

2. The LED lighting system of claim 1, wherein a logic device is further connected between the third terminal of the first switching circuit or the sixth terminal of the second switching circuit and the second signal output terminal; the logic device is used for outputting an opposite signal to the third end or the sixth end according to the color temperature adjusting signal so as to conduct the first switch circuit or the second switch circuit.

3. The LED lighting system of claim 2, wherein the logic device is an inverter.

4. The LED lighting system of claim 1, wherein the first switching circuit comprises: the first resistor comprises a first field effect transistor, a first triode, a first resistor and a second resistor;

The drain electrode of the first field effect transistor is electrically connected with the other end of the second LED lamp set; the source electrode of the first field effect transistor is electrically connected with the negative output end of the power supply module; the grid electrode of the first field effect transistor is respectively and electrically connected with one end of the first resistor and the collector electrode of the first triode;

the other end of the first resistor is connected with a power supply anode;

the emitter of the first triode is connected with the negative electrode of a power supply;

the base electrode of the first triode is electrically connected with one end of the second resistor; the other end of the second resistor is electrically connected with the second signal output end.

5. The LED lighting system of claim 1, wherein the second switching circuit comprises: the second FET, the second triode, the third resistor and the fourth resistor;

The drain electrode of the second field effect transistor is electrically connected with the other end of the third LED lamp set; the source electrode of the second field effect transistor is electrically connected with the negative electrode output end of the power supply module; the grid electrode of the second field effect transistor is respectively and electrically connected with one end of the third resistor and the collector electrode of the second triode;

the other end of the third resistor is connected with a power supply anode;

the emitter of the second triode is connected with the negative electrode of a power supply;

The base electrode of the second triode is electrically connected with one end of the fourth resistor; and the other end of one end of the fourth resistor is electrically connected with the second signal output end.

6. The LED lighting system of claim 1, wherein the power module comprises: an AC/DC power supply, and a DC/DC power supply;

the AC/DC power supply is used for accessing alternating current and outputting direct current;

The DC/DC power supply is used for accessing direct current and outputting the direct current;

the positive output end of the AC/DC power supply is electrically connected with the positive input end of the DC/DC power supply; the negative output end of the AC/DC power supply is electrically connected with the negative input end of the DC/DC power supply;

The positive electrode output end and the negative electrode output end of the AC/DC power supply are electrically connected with the power interface of the communication control module; or the positive electrode output end of the DC/DC power supply and the negative electrode of the output end are electrically connected with the power interface of the communication control module.

7. The LED lighting system of claim 6, wherein the first switching circuit comprises: the first resistor comprises a first field effect transistor, a first triode, a first resistor and a second resistor; the drain electrode of the first field effect transistor is electrically connected with the other end of the second LED lamp set; the source electrode of the first field effect transistor is electrically connected with the negative electrode of the output end of the power supply module; the grid electrode of the first field effect transistor is respectively and electrically connected with one end of the first resistor and the collector electrode of the first triode; the other end of the first resistor is connected with a power supply anode; the emitter of the first triode is connected with the negative electrode of a power supply; the base electrode of the first triode is electrically connected with one end of the second resistor; the other end of the second resistor is electrically connected with a second signal output end of the communication control module;

The second switching circuit includes: the second FET, the second triode, the third resistor, the fourth resistor and the inverter; the drain electrode of the second field effect transistor is electrically connected with the other end of the third LED lamp set; the source electrode of the second field effect transistor is electrically connected with the negative electrode of the output end of the power supply module; the grid electrode of the second field effect transistor is respectively and electrically connected with one end of the third resistor and the collector electrode of the second triode; the other end of the third resistor is connected with a power supply anode; the emitter of the second triode is connected with the negative electrode of a power supply; the base electrode of the second triode is electrically connected with one end of the fourth resistor; the other end of the fourth resistor is electrically connected with the second signal output end of the communication control module;

The power supply anode can be the AC/DC power supply anode or the DC/DC power supply anode; the power supply negative electrode may be the AC/DC power supply negative electrode or the DC/DC power supply negative electrode.

8. The LED lighting system of claim 1, wherein the positive output terminal of the power module and the other end of the second LED lamp set are further connected to a first capacitor; and the positive output end of the power supply module and the other end of the third LED lamp group are also connected with a second capacitor.

9. The LED lighting system of claim 1, wherein the first LED light set, the second LED light set, and the third LED light set are each comprised of a plurality of light beads in series.

10. The LED lighting system of claim 1, wherein the first LED light set, the second LED light set, and the third LED light set are each yellow, red, and green in color.

11. The LED lighting system of claim 1, wherein the brightness adjustment signal and the color temperature adjustment signal are PWM signals.

12. A method for adjusting the color temperature of an LED, applied to the LED lighting system according to any one of claims 1 to 10, comprising:

receiving a color temperature adjusting instruction;

Sending a PWM color temperature adjusting signal;

And controlling the change of the on or off state of the first switch circuit or the second switch circuit through the PWM color temperature adjusting signal so as to control the on time of the second LED lamp group or the third LED lamp group and realize light mixing.

13. The method of claim 12, wherein the first LED lamp set, the second LED lamp set, and the third LED lamp set each require a minimum number of LED lamp beads, and the color temperature mixing algorithm is used to calculate the minimum number of LED lamp beads from the desired mixed color temperature to the CIE point coordinate position, the first LED lamp set original color temperature to the CIE coordinate position, the second LED lamp set original color temperature to the CIE coordinate position, the third LED lamp set original color temperature to the CIE point coordinate position, and the desired mixed color temperature to more point coordinate positions on the reverse extension line of the CIE coordinate position to the CIE coordinate position.

14. A method for adjusting the brightness of an LED, applied to the LED lighting system according to any one of claims 1 to 10, comprising:

Receiving a brightness adjusting instruction;

Sending a PWM brightness adjustment signal;

And adjusting the output current of the AC/DC power supply through the PWM brightness adjusting signal so as to obtain different brightness.

15. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the LED color temperature adjustment method of any one of claims 12 to 13, or implements the LED brightness adjustment method of claim 14.