CN106793325B

CN106793325B - Lighting device, LED drive circuit, and LED lighting drive method

Info

Publication number: CN106793325B
Application number: CN201710004791.9A
Authority: CN
Inventors: 王刚; 史良丽
Original assignee: Shanghai Bright Power Semiconductor Co Ltd
Current assignee: Shanghai Bright Power Semiconductor Co Ltd
Priority date: 2017-01-04
Filing date: 2017-01-04
Publication date: 2020-03-20
Anticipated expiration: 2037-01-04
Also published as: CN106793325A

Abstract

The invention provides a lighting device, an LED driving circuit and a driving method of LED lighting, wherein the lighting device comprises a first controller, a second controller and a third controller, wherein the first controller is electrically connected with a first LED load and used for controlling the working current input to the first LED load; the second controller is connected with the first LED load in parallel after being connected with the second LED load in series, the second controller detects the voltage at two ends of the detection unit connected with the second controller and compares the voltage with a built-in first threshold value, when the voltage at two ends of the detection unit is larger than the first threshold value, the second controller works in a high-resistance state, and the second LED load does not work; when the voltage at the two ends of the detection unit is smaller than the first threshold value, the second controller is used for controlling the working current input to the second LED load by the first controller. The invention can be matched with a preceding stage dimming circuit at will, can automatically adjust the color temperature switching point and the adjustment degree of the color temperature, and has good dimming and toning compatibility.

Description

Lighting device, LED drive circuit, and LED lighting drive method

Technical Field

The invention belongs to the technical field of LED illumination, relates to a control device, and particularly relates to an illumination device, an LED driving circuit and an LED illumination driving method.

Background

In the field of LED lighting, dimming and color temperature adjustment have been the focus of attention. So-called dimming, i.e. adjusting the brightness of a light source; the term "color temperature" is generally used to refer to the adjustment of the color of a light source, and refers to the temperature of a black body at which the color of light emitted from the light source coincides with the hue of light emitted from the black body at a certain temperature. The difference between the color temperature and the brightness is often different, for example, under the irradiation of a high color temperature light source, the brightness is not high, so that people have a cool and shady atmosphere; under the irradiation of a low color temperature light source, the brightness is too high, and a stuffy feeling is brought to people. Therefore, the brightness and the color temperature of the light source are accurately adjusted, and the market competitiveness of the LED illumination product is favorably improved.

The existing mainstream dimming and color mixing technology in the current market has high requirement on output parameters and can not be adjusted at will according to self requirements so as to realize different dimming and color mixing effects. Moreover, the effect is not ideal.

Therefore, how to provide a lighting device, an LED driving circuit, and a driving method for LED lighting to solve the problems of the prior art, such as high requirement for output parameters and incapability of arbitrarily adjusting light color according to the requirement of the mainstream dimming and color adjusting technology, has become a technical problem to be solved in the art.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a lighting device, an LED driving circuit, and a driving method for LED lighting, which are used to solve the problems that the mainstream dimming and color-adjusting technology in the prior art has high requirements on output parameters and cannot adjust light color freely according to its own needs.

To achieve the above and other related objects, an aspect of the present invention provides a lighting device including a first LED load, a second LED load, a first controller, a second controller; the first controller is electrically connected with the first LED load and used for controlling the working current input to the first LED load; the second controller is connected with the second LED load in series and then connected with the first LED load in parallel, wherein the second controller detects the voltage at two ends of the detection unit connected with the second controller and compares the voltage with a built-in first threshold value, and when the voltage at two ends of the detection unit is greater than the first threshold value, the second controller works in a high-resistance state, and the second LED load does not work; when the voltage across the detection unit is smaller than the first threshold, the second controller is used for controlling the working current input to the second LED load by the first controller.

In an embodiment of the invention, the second controller compares the output voltage of the first controller with a second threshold value built in the second controller, when the output voltage of the first controller is greater than or equal to the second threshold value, the second controller does not operate, and the color temperature of the lighting device is the color temperature of the first LED load; when the output voltage of the first controller is larger than or equal to a second threshold value and when the voltage at two ends of the detection unit is smaller than the first threshold value, the second controller is used for controlling the first controller to input the working current of the second LED load, and the color temperature of the lighting equipment is the color temperature of the first LED load and the color temperature of the second LED load.

In an embodiment of the present invention, the lighting device further includes a dimmer; the dimmer is electrically connected with alternating current or direct current and is used for controlling the working current input to the first LED load by the first controller by adjusting a dimming angle; wherein the smaller the dimming angle is, the smaller the operating current input to the first LED load is.

In an embodiment of the invention, when the dimmer is adjusted from the maximum dimming angle to the first predetermined angle, the operating current output by the first controller to the first LED load is decreased, and the second controller gradually decreases according to the voltage across the detection unit until the voltage is smaller than the first threshold, and adjusts the color temperature of the lighting device to be a mixed color temperature of the first LED load and the color temperature of the second LED load; wherein a color temperature of the first LED load is different from a color temperature of the second LED load.

In an embodiment of the invention, when the dimming angle of the dimmer is smaller than a second predetermined angle and when the second controller detects that the output voltage of the first controller is greater than or equal to a second threshold, the first LED load does not operate, the second controller is configured to control the working current input to the second LED load by the first controller, and the color temperature of the lighting device is the color temperature of the second LED load.

In an embodiment of the invention, the first controller is an LED linear constant current driver.

In an embodiment of the invention, the lighting device further includes a first resistor, one end of the first resistor is connected to the negative output terminal of the first controller, and the other end of the first resistor is connected to one end of the first LED load, and the magnitude of the first predetermined angle is adjusted by setting a resistance value of the first resistor, where the larger the resistance value of the first resistor is, the smaller the first predetermined angle is.

In an embodiment of the invention, when the operating voltage of the first LED load and the operating voltage of the second LED load are greater than or equal to a voltage difference threshold, a second resistor may be disposed between the second LED load and the second controller; one end of the second resistor is connected with the input end of the second controller, and the other end of the second resistor is connected with one end of the second LED load; the pressure difference threshold is set according to practical application.

In an embodiment of the present invention, the detecting unit is a third resistor; one end of the third resistor is connected with the second controller, the other end of the third resistor is connected with the other end of the first resistor, one end of the second LED load is connected with the input end of the second controller, and the other end of the second LED load is connected with the positive output end of the first controller.

In an embodiment of the invention, the second controller detects the output voltage of the first controller through the second LED load or the second LED load and the second resistor.

In an embodiment of the invention, the second controller further includes a ground terminal, and the ground terminal is connected to one end of the first resistor.

Another aspect of the present invention provides a lighting device comprising a plurality of LED loads, a plurality of controllers, wherein the plurality of LED loads comprises a first LED load, a second LED load, …, an mth LED load; the plurality of controllers includes a first controller, a second controller, …, an Mth controller, M is a positive integer greater than 2; the first controller is electrically connected with the first LED load and used for controlling the working current input to the first LED load; the second controller … and the Mth controller are respectively and correspondingly electrically connected with the second LED load … and the Mth LED load one by one and are used for respectively controlling the working current input to the second LED load … and the Mth LED load by the first controller; when the voltage at the two ends of the detection unit is greater than the first threshold value, each controller except the first controller works in a high-impedance state, and an LED load electrically connected with the controller does not work; when the voltage across the detection unit is smaller than the first threshold, the controllers respectively control the first controller to input the working current to the second LED load, … and the Mth LED load, wherein the second controller, … and the Mth controller are electrically connected with the second controller, … and the Mth controller one by one.

In another aspect, the present invention provides an LED driving circuit, the LED driving circuit being electrically connected to a plurality of LED loads, the plurality of LED loads including a first LED load, a second LED load, …, an mth LED load, M being a positive integer greater than 2; the LED driving circuit comprises a plurality of controllers, a first controller, a second controller, … and an Mth controller; the first controller is electrically connected with the first LED load and used for controlling the working current input to the first LED load; the second controller … and the Mth controller are respectively and correspondingly electrically connected with the second LED load … and the Mth LED load one by one and are used for respectively controlling the working current input to the second LED load … and the Mth LED load by the first controller; when the voltage at the two ends of the detection unit is greater than the first threshold value, each controller except the first controller works in a high-impedance state, and an LED load electrically connected with the controller does not work; when the voltage across the detection unit is smaller than the first threshold, the second controller, …, the mth controller respectively control the first controller to input the working current to the second LED load, …, the mth LED load, which are electrically connected with the second controller, …, the mth controller one by one.

In a final aspect of the present invention, a driving method for LED lighting is provided, which includes the following steps: 1) the first controller is used for controlling the working current input to the first LED load; 2) the second controller detects the voltage at two ends of the detection unit connected with the second controller and compares the voltage with a built-in first threshold value, when the voltage at two ends of the detection unit is larger than the first threshold value or when the output voltage of the first controller is smaller than a second threshold value, the second controller works in a high-impedance state, and the second LED load does not work; when the voltage on the detection unit is smaller than the first threshold value and the output voltage of the first controller is larger than or equal to a second threshold value, the second controller is used for controlling the working current input to the second LED load by the first controller.

In an embodiment of the present invention, the step 1) further includes: controlling the working current input to the first LED load by the first controller by adjusting a dimming angle; wherein the smaller the dimming angle is, the smaller the operating current input to the first LED load is.

In an embodiment of the invention, when the dimmer is adjusted from the maximum dimming angle to the first predetermined angle, the operating current output by the first controller to the first LED load is reduced, and the second controller gradually reduces according to the voltage across the detection unit until the voltage is smaller than the first threshold, and adjusts the color temperature of the lighting device to be a mixed color temperature of the first LED load and the color temperature of the second LED load; wherein a color temperature of the first LED load is different from a color temperature of the second LED load.

In an embodiment of the invention, when the dimming angle of the dimmer is smaller than a second predetermined angle and the second controller detects that the output voltage of the first controller is greater than or equal to a second threshold, the first LED load does not operate, the second controller is configured to control the working current input to the second LED load by the first controller, and the color temperature of the lighting device is the color temperature of the second LED load.

As described above, the lighting device, the LED driving circuit, and the driving method of LED lighting according to the present invention have the following advantageous effects:

the lighting equipment, the LED driving circuit and the LED lighting driving method select linear electronic elements to realize the color mixing function, can be matched with the preceding stage dimming circuit at will, can automatically adjust the color temperature switching point and the adjustment degree of the color temperature, and have good light and color mixing compatibility.

Drawings

Fig. 1 is a schematic structural diagram of an illumination device according to an embodiment of the invention.

Fig. 2 is a circuit diagram of an embodiment of the lighting apparatus of the present invention.

Fig. 3 is a schematic structural diagram of an illumination device according to another embodiment of the present invention.

Fig. 4 is a flowchart illustrating a driving method of LED lighting according to an embodiment of the invention.

Description of the element reference numerals

1 Lighting device

11 first LED load

12 second LED load

13 first controller

14 second controller

15 light modulator

16 detection unit

2 Lighting device

211 first LED load

212 second LED load

213 third LED load

22 controller

221 first controller

222 second controller

223 third controller

241 detection unit

242 detection unit

23 light modulator

S1-S2 steps

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

Example one

The present embodiment provides a lighting device, including a first LED load, a second LED load, a first controller, and a second controller;

the first controller is electrically connected with the first LED load and used for controlling the working current input to the first LED load;

the second controller is connected with the second LED load in series and then connected with the first LED load in parallel, wherein the second controller detects the voltage at two ends of the detection unit connected with the second controller and compares the voltage with a built-in first threshold value, and when the voltage at two ends of the detection unit is greater than the first threshold value, the second controller works in a high-resistance state, and the second LED load does not work; when the voltage across the detection unit is smaller than the first threshold, the second controller is used for controlling the working current input to the second LED load by the first controller.

The control device of the lighting apparatus provided in the present embodiment will be described in detail with reference to the drawings. The control device described in this embodiment is applied to lighting equipment, and according to the self demand, adjusts output parameter at will to adjust the colour temperature of lighting equipment. Referring to fig. 1 and fig. 2, schematic structural diagrams of an embodiment of an illumination apparatus and a circuit diagram of an embodiment of the illumination apparatus are shown. As shown in fig. 1, the lighting apparatus 1 includes a first LED load 11, a second LED load 12, a first controller 13, a second controller 14, a dimmer 15, and a detection unit 16. Wherein the color temperature of the first LED load 11 in the lighting device 1 is a, for example, the color temperature a is a cold color system or a warm color system.

The first controller 13 includes a positive output end and a negative output end, the positive output end of the first controller 13 is connected to one end of the first LED load 11 (as shown in fig. 1, one end of the first LED load 11 is a positive electrode of the LED lamp), and the negative output end of the first controller 13 is connected to the other end of the first LED load 11 (as shown in fig. 1, the other end of the first LED load 11 is a negative electrode of the LED lamp). In this embodiment, the first controller 13 is a silicon controlled rectifier dimming circuit (LED linear constant current driver) with any configuration.

Specifically, the first controller 13 is further connected to a first resistor R1 functioning as a voltage divider, i.e. connected to the negative output terminal of the first controller 13, for dividing the operating current inputted to the first LED load 11.

The second controller 14 is connected in series with the second LED load 12 and then connected in parallel with the first LED load 11, wherein the second controller 14 detects the voltage across the detection unit 16 connected thereto and compares the voltage with a first threshold value built in the second controller, and when the voltage across the detection unit 16 is greater than the first threshold value, the second controller 14 operates in a high impedance state, and the second LED load 12 does not operate; when the voltage across the detection unit 16 is smaller than the first threshold, the second controller 14 is configured to control the operating current input to the second LED load 12 by the first controller 13.

The second controller 14 compares the output voltage of the first controller 13 with a second threshold value built in the second controller, and when the output voltage of the first controller 13 is greater than or equal to the second threshold value and the voltage across the detection unit 16 is greater than the first threshold value, the second controller 14 does not operate, and the color temperature of the lighting device is the color temperature of the first LED load 11; when the output voltage of the first controller 13 is greater than or equal to the second threshold and the voltage across the detection unit 16 is smaller than the first threshold, the second controller 14 controls the first controller 13 to input the working current to the second LED load 12, and the color temperature of the lighting device is the color temperature of the first LED load 11 plus the color temperature of the second LED load 12.

A dimmer 15 electrically connected to the first controller 13 for controlling the operating current input to the first LED load 11 by the first controller by adjusting a dimming angle; wherein the smaller the dimming angle is, the smaller the operating current input to the first LED load is. The dimmer 15 controls the operating current input to the first LED load 12 by the scr dimming circuit through adjusting the dimming angle.

When the dimmer 15 is adjusted from the maximum dimming angle to a first predetermined angle, the working current output by the first controller to the first LED load is reduced, and the second controller controls the working current supplied to the second LED load to be gradually reduced according to the voltage at the two ends of the detection unit, so as to adjust the color temperature of the lighting device to be the color temperature of the first LED load 11 plus the color temperature of the second LED load 12; wherein the color temperature of the first LED load 11 is different from the color temperature of the second LED load 12. When the dimming angle of the dimmer 15 is smaller than a second predetermined angle and when the second controller detects that the output voltage of the first controller is greater than a second threshold, the first LED load 11 does not operate, the second controller 14 controls the operating current input to the second LED load 12 by the first controller 13, and the color temperature of the lighting device is the color temperature of the second LED load. The second predetermined angle is determined according to a voltage difference value between the second load and the first load, and the larger the voltage difference is, the larger the second predetermined angle is. When the dimming angle of the dimmer is smaller than a second predetermined angle and when the second controller detects that the output voltage of the first controller is smaller than a second threshold, neither the first LED load 11 nor the second LED load 12 is operated. In the present embodiment, the switching of the color temperature between the first LED load color temperature and the second LED load color temperature is due to the first threshold value. The switching of the color temperature between the first LED load color temperature and the second LED load color temperature and the no color temperature output is due to the second threshold.

The second controller detects the output voltage of the first controller through the second LED load or the second LED load and the second resistor.

In the present embodiment, the detection unit connected to the second controller 14 is provided as a third resistor R3.

When the voltage difference between the second LED load 12 and the first LED load 11 is greater than or equal to a voltage difference threshold (the voltage difference threshold is set according to practical applications), a second resistor R2 for sharing voltage is disposed between the second LED load 12 and the input end of the second controller 14. When the LED2 is too small compared with the LED1, for example, the operating voltage of the LED1 is 80V, and the operating voltage of the LED2 is about 70V in an ideal state, however, due to different requirements of users on the color temperature mixing time and depth, the voltage of the LED2 may be set to 30V, and the voltage needs to be shared by the second resistor R2. When the voltage difference between the second LED load 12 and the first LED load 11 is small, a short circuit is set between the second LED load 12 and the input of the second controller 14.

As shown in fig. 2, one end of the first resistor R1 is connected to the negative output end of the first controller 13, the other end of the first resistor R1 is connected to one end of the first LED load 11 (as shown in fig. 2, one end of the first LED load 11 is the negative electrode of the LED lamp), and the other end of the first LED load 11 is connected to the positive output end of the first controller 13; one end of the third resistor R3 is connected to the output end (CS end) of the second controller 14, and the other end of the third resistor R3 is connected to one end of the first LED load 11 (as shown in fig. 2, one end of the first LED load 11 is the negative electrode of the LED lamp). The ground GND of the second controller 14 is connected to the other end of the first resistor R1. One end of the second resistor R2 is connected to the input end Drain of the second controller 14, and the other end of the second resistor R2 is connected to one end of the second LED load 12 (as shown in fig. 2, one end of the second LED load 12 is a cathode of the LED lamp).

Example two

Fig. 3 is a schematic view of another embodiment of an illumination apparatus 2 according to the present embodiment. The lighting device 2 includes a plurality of LED loads 21 (including a first LED load 211, a second LED load 212, …, a third LED load 21M, M being equal to or greater than 3), and a plurality of controllers 22. The plurality of controllers 22 include a first controller 221, a second controller 222, and an mth controller 22M. The first controller 221, the second controllers 222, …, and the mth controller 22M are electrically connected to the first LED load 211, the second LED loads 212, …, and the mth LED load 21M, respectively, one by one. As shown in fig. 3, M is equal to 3 in this embodiment. Wherein, the first controller 221 electrically connected to the first LED load 211 is used for controlling the working current input to the first LED load 211; the first controller 221, the second controller 222, and the third controller 223 are respectively used for controlling the working current input to the plurality of LED loads by the first controller. Wherein, each controller except the first controller 221, namely the second controller 222 and the third controller 223, is compared with a built-in first threshold value by detecting the voltage on the detection unit connected with the controller (namely, the detection unit 241 connected with the second controller 222 and the detection unit 242 connected with the third controller 223), and when the voltage on the detection unit 242 and the detection unit 241 is greater than the first threshold value, the second controller 222 and the third controller 223 work in a high impedance state, and the LED load electrically connected with the controller does not work; when the voltages across the

detection units

242 and 241 are smaller than the first threshold, the second controller 222 and the third controller 223 are used to control the operating current input by the first controller 221 to the second LED load and the third LED load electrically connected to the second controller 222 and the third controller 223, respectively.

The dimmer 23 electrically connected with the first controller 221 is used for controlling the working current input to the first LED load by the first controller by adjusting the dimming angle; wherein the smaller the dimming angle is, the smaller the operating current input to the first LED load is. The dimmer 23 is a dimmer that controls the operating voltage input to the first LED load by the scr dimming circuit by adjusting a dimming angle.

When the dimmer 23 is adjusted from the maximum dimming angle to a first predetermined angle, the working current voltage output by the first controller to the first LED load is reduced accordingly, and the second controller and/or the third controller controls the working current supplied to the second LED load and/or the third LED load to be gradually reduced according to the voltage at the two ends of the detection unit until the working current is smaller than a first threshold value, so as to adjust the color temperature of the lighting device to be the color temperature of the first LED load plus the color temperature of the second LED load and/or the third LED load; wherein the color temperature of the first LED load is different from the color temperature of the second LED load and/or the third LED load. When the dimming angle of the dimmer is smaller than a second preset angle and when the second controller and/or the third controller detect that the output voltage of the first controller is larger than or equal to a second threshold value, the first LED load does not work, the second controller and/or the third controller are used for controlling the working current input to the second LED load and/or the third LED load by the first controller, and the color temperature of the lighting equipment is the color temperature of the second LED load and/or the third LED load. The second predetermined angle is determined according to the voltage difference value of the second LED load and/or the third LED load and the first load, and the larger the voltage difference is, the larger the second predetermined angle is. When the dimming angle of the dimmer is smaller than a second preset angle and when the second controller and/or the third controller detect that the output voltage of the first controller is smaller than a second threshold value, the first LED load, the second LED load and the third LED load do not work.

The present embodiment also provides an LED driving circuit applied to a lighting apparatus including a plurality of LED loads (a first LED load, a second LED load, …, an mth LED load, M is equal to or greater than 3). The LED driving circuit includes a plurality of controllers (a first controller, a second controller, …, an mth controller). The first controller is electrically connected with the first LED load and used for controlling the working current input to the first LED load; the plurality of controllers are respectively and electrically connected with the plurality of LED loads except the first LED load one by one and are used for respectively controlling the working current input to the plurality of LED loads by the first controller; when the voltage across the detection unit is greater than the first threshold value, each controller (a second controller, … and an Mth controller) except the first controller works in a high-impedance state, and an LED load electrically connected with the controller does not work; when the voltage at two ends of the detection unit is smaller than the first threshold value, the controller is used for controlling the working current input to the LED load electrically connected with the controller by the first controller.

EXAMPLE III

Fig. 4 is a schematic flow chart of an LED lighting driving method according to an embodiment. As shown in fig. 4, the driving method of the LED lighting includes the following steps:

s1, the first controller controls an operating current input to the first LED load. In the embodiment, the working current input to the first LED load by the first controller is controlled by adjusting the dimming angle of a dimmer connected with the first controller; wherein the smaller the dimming angle is, the smaller the operating current input to the first LED load is. When the dimmer is adjusted to a first preset angle from a maximum dimming angle, the working current output to the first LED load by the first controller is reduced, the working current supplied to the second LED load is controlled by the second controller according to the voltage at the two ends of the detection unit to be gradually reduced until the working current is smaller than a first threshold value, and the color temperature of the lighting equipment is adjusted to be the color temperature of the first LED load and the color temperature of the second LED load; wherein a color temperature of the first LED load is different from a color temperature of the second LED load.

In this embodiment, when the dimming angle of the dimmer is smaller than a second predetermined angle and when the second controller detects that the output voltage of the first controller is greater than or equal to a second threshold, the first LED load does not operate, the second controller is configured to control the operating current input by the first controller to the second LED load, and the color temperature of the lighting device is the color temperature of the second LED load.

When the dimming angle of the dimmer is smaller than a second preset angle and the second controller detects that the output voltage of the first controller is smaller than a second threshold value, the first LED load and the second LED load do not work.

S2, the second controller detects the voltage at two ends of the detection unit connected with the second controller and compares the voltage with a built-in first threshold value, when the voltage at two ends of the detection unit is smaller than the first threshold value or when the output voltage of the first controller is larger than or equal to a second threshold value, the second controller works in a high-impedance state, and the second LED load does not work; when the voltage across the detection unit is smaller than the first threshold value and the output voltage of the first controller is larger than or equal to a second threshold value, the second controller is used for controlling the working current input to the second LED load by the first controller.

In summary, the lighting device, the LED driving circuit, and the LED lighting driving method of the present invention select a linear electronic component to implement a color-mixing function, and can be optionally matched with a preceding-stage dimming circuit, so as to automatically adjust a color temperature switching point and an adjustment degree of color temperature, thereby having good compatibility of light-mixing and color-mixing. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A lighting device comprising a first LED load, a second LED load, a first controller, a second controller, and a dimmer;

the first controller is electrically connected with the first LED load and used for controlling the working current input to the first LED load; the second controller is connected with the second LED load in series and then connected with the first LED load in parallel, wherein the second controller detects the voltage at two ends of the detection unit connected with the second controller and compares the voltage with a built-in first threshold value, and when the voltage at two ends of the detection unit is greater than the first threshold value, the second controller works in a high-resistance state, and the second LED load does not work; when the voltage at two ends of the detection unit is smaller than the first threshold value, the second controller is used for controlling the working current input to the second LED load by the first controller;

the dimmer is electrically connected with alternating current or direct current and is used for controlling the working current input to the first LED load by the first controller by adjusting a dimming angle; wherein the smaller the dimming angle is, the smaller the working current input to the first LED load is; when the dimming angle of the dimmer is smaller than a second preset angle and when the second controller detects that the output voltage of the first controller is larger than or equal to a second threshold value, the first LED load does not work, the second controller is used for controlling the working current input to the second LED load by the first controller, and the color temperature of the lighting equipment is the color temperature of the second LED load.

2. The lighting apparatus according to claim 1,

the second controller compares the output voltage of the first controller with a second threshold value built in the second controller, when the output voltage of the first controller is greater than or equal to the second threshold value and the voltage at two ends of the detection unit is greater than the first threshold value, the second controller does not work, and the color temperature of the lighting equipment is the color temperature of the first LED load; when the output voltage of the first controller is larger than or equal to a second threshold value and when the voltage at two ends of the detection unit is smaller than the first threshold value, the second controller is used for controlling the first controller to input the working current of the second LED load, and the color temperature of the lighting equipment is the color temperature of the first LED load and the color temperature of the second LED load.

3. The illumination device of claim 1, wherein: when the dimmer is adjusted to a first preset angle from a maximum dimming angle, the working current output to the first LED load by the first controller is reduced, the second controller gradually reduces according to the voltage at the two ends of the detection unit until the voltage is smaller than a first threshold value, and the color temperature of the lighting equipment is adjusted to be the mixed color temperature of the first LED load and the color temperature of the second LED load; wherein a color temperature of the first LED load is different from a color temperature of the second LED load.

4. The illumination device of claim 1, wherein: the first controller is an LED linear constant current driver.

5. The lighting device as claimed in claim 3, further comprising a first resistor, one end of the first resistor is connected to the negative output terminal of the first controller, the other end of the first resistor is connected to one end of the first LED load, the first predetermined angle is adjusted by setting a resistance value of the first resistor, and the larger the resistance value of the first resistor is, the smaller the first predetermined angle is.

6. A lighting device as recited in claim 3, wherein: when the working voltage of the first LED load and the working voltage of the second LED load are greater than or equal to a voltage difference threshold, a second resistor may be disposed between the second LED load and the second controller; one end of the second resistor is connected with the input end of the second controller, and the other end of the second resistor is connected with one end of the second LED load; the pressure difference threshold is set according to practical application.

7. The illumination device of claim 5, wherein: the detection unit is a third resistor; one end of the third resistor is connected with the second controller, the other end of the third resistor is connected with the other end of the first resistor, one end of the second LED load is connected with the input end of the second controller, and the other end of the second LED load is connected with the positive output end of the first controller.

8. The illumination device of claim 6, wherein: the second controller detects the output voltage of the first controller through the second LED load or the second LED load and the second resistor.

9. The illumination device of claim 5, wherein: the second controller further comprises a grounding end, and the grounding end is connected with one end of the first resistor.

10. A lighting device comprising a plurality of LED loads, a plurality of controllers, wherein the plurality of LED loads comprises a first LED load, a second LED load, …, an mth LED load; the plurality of controllers includes a first controller, a second controller, …, an Mth controller, M is a positive integer greater than 2; a dimmer connected to the first controller;

the second controller … and the Mth controller are respectively and correspondingly electrically connected with the second LED load … and the Mth LED load one by one and are used for respectively controlling the working current input to the second LED load … and the Mth LED load by the first controller;

when the voltage at the two ends of the detection unit is greater than the first threshold value, each controller except the first controller works in a high-impedance state, and an LED load electrically connected with the controller does not work; when the voltage at two ends of the detection unit is smaller than the first threshold, the second controller, …, the Mth controller respectively control the first controller to input the working current to the second LED load, …, the Mth LED load which are electrically connected with the second controller, …, the Mth controller one by one;

the dimmer is electrically connected with alternating current or direct current and is used for controlling the working current input to the first LED load by the first controller by adjusting a dimming angle; wherein the smaller the dimming angle is, the smaller the working current input to the first LED load is; when the dimming angle of the dimmer is less than the second predetermined angle, and when the second controller … and the mth controller respectively detect that the output voltage of the first controller is greater than or equal to the second threshold, the first LED load does not work, the second controller … and the mth controller are respectively used for controlling the first controller to input the working current of the second LED load, … and the mth LED load, and the color temperature of the lighting device is the mixed color temperature of the second LED load, … and the mth LED load.

11. An LED driving circuit is characterized in that the LED driving circuit is electrically connected with a plurality of LED loads, the plurality of LED loads comprise a first LED load, a second LED load, … and an Mth LED load, M is a positive integer greater than 2; the LED driving circuit comprises a plurality of controllers, a first controller, a second controller, … and an Mth controller; a dimmer connected to the first controller;

the dimmer is electrically connected with alternating current or direct current and is used for controlling the working current input to the first LED load by the first controller by adjusting a dimming angle; wherein the smaller the dimming angle is, the smaller the working current input to the first LED load is; when the dimming angle of the dimmer is less than the second predetermined angle, and when the second controller … and the mth controller respectively detect that the output voltage of the first controller is greater than or equal to the second threshold, the first LED load does not operate, the second controller … and the mth controller are respectively used for controlling the first controller to input the operating current of the second LED load, … and the mth LED load, and the color temperatures of the plurality of LED loads are the mixed color temperatures of the second LED load, … and the mth LED load.

12. The driving method of the LED illumination is characterized by being applied to illumination equipment comprising a first LED load, a second LED load, a first controller, a second controller and a dimmer; the driving method of the LED illumination comprises the following steps:

1) the first controller is used for controlling the working current input to the first LED load;

2) the second controller detects the voltage at two ends of the detection unit connected with the second controller and compares the voltage with a built-in first threshold value, when the voltage at two ends of the detection unit is larger than the first threshold value or when the output voltage of the first controller is smaller than a second threshold value, the second controller works in a high-impedance state, and the second LED load does not work; when the voltage at two ends of the detection unit is smaller than the first threshold value and the output voltage of the first controller is larger than or equal to a second threshold value, the second controller is used for controlling the working current input to the second LED load by the first controller; controlling the working current input to the first LED load by the first controller by adjusting a dimming angle; wherein the smaller the dimming angle is, the smaller the working current input to the first LED load is; when the dimming angle of the dimmer is smaller than a second preset angle and when the second controller detects that the output voltage of the first controller is larger than or equal to a second threshold value, the first LED load does not work, the second controller is used for controlling the working current input to the second LED load by the first controller, and the color temperature of the lighting equipment is the color temperature of the second LED load.

13. The driving method of LED lighting according to claim 12, wherein: the step 1) further comprises the following steps:

controlling the working current input to the first LED load by the first controller by adjusting a dimming angle; wherein the smaller the dimming angle is, the smaller the operating current input to the first LED load is.

14. The driving method of LED lighting according to claim 13, wherein: when the dimmer is adjusted to a first preset angle from a maximum dimming angle, the working current output to the first LED load by the first controller is reduced, the second controller gradually reduces according to the voltage at the two ends of the detection unit until the voltage is smaller than a first threshold value, and the color temperature of the lighting equipment is adjusted to be the mixed color temperature of the first LED load and the color temperature of the second LED load; wherein a color temperature of the first LED load is different from a color temperature of the second LED load.