CN210274622U - LED lamp and LED lamp circuit thereof - Google Patents
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- CN210274622U CN210274622U CN201920865589.XU CN201920865589U CN210274622U CN 210274622 U CN210274622 U CN 210274622U CN 201920865589 U CN201920865589 U CN 201920865589U CN 210274622 U CN210274622 U CN 210274622U
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Abstract
The application discloses LED lamps and lanterns and LED lamp circuit thereof, this LED lamp circuit includes: a rectifier; the white light emitting circuit is connected with the output end of the rectifier and comprises a high-voltage DC-DC constant-current LED driver and a white light LED lamp bead string which are sequentially connected, and the high-voltage DC-DC constant-current LED driver is used for driving the white light LED lamp bead string at a constant current; the high-voltage DC-DC converter is connected with the output end of the rectifier and used for converting the high-voltage direct current to output low-voltage direct current; the color light emitting circuit is connected with the output end of the high-voltage DC-DC converter and comprises a linear constant-current LED driver and a color light LED lamp bead string which are connected in series; and the control circuit is connected with the output end of the high-voltage DC-DC converter and is used for outputting corresponding dimming signals to the high-voltage DC-DC constant-current LED driver and the linear constant-current LED driver. The method and the device can effectively reduce system power consumption and reduce heat generation.
Description
Technical Field
The application relates to the technical field of LED driving, in particular to an LED lamp and an LED lamp circuit thereof.
Background
The LED (light Emitting diode) lamp is an electroluminescent semiconductor material chip, is solidified on a bracket by silver glue or white glue, then is connected with the chip and a circuit board by silver wires or gold wires, is sealed by epoxy resin at the periphery to play a role in protecting an internal core wire, and is finally provided with a shell. At present, the LED lamp is widely applied to daily work and life of people due to the excellent performances of energy conservation and long service life.
The LED lamp bead is a light-emitting element in the LED lamp. Different kinds of LED lamp beads can send different wavelengths, namely, different colors of light. In the prior art, in most of LED color light dimming schemes, after a high-voltage DC-DC converter is used to obtain low-voltage direct current, a low-voltage working linear constant-current LED driver is used to drive all LED lamp bead strings including a white LED lamp bead string to be turned on. In fact, in the using process of a user, the luminous power of the white light LED lamp bead string is often required to be larger and is obviously higher than that of other colored LED lamp bead strings. A linear constant-current LED driver is adopted to drive the white-light LED lamp bead string, so that the system loss is increased, and the heating is serious.
In view of the above, it is an important need for those skilled in the art to provide a solution to the above technical problems.
SUMMERY OF THE UTILITY MODEL
The application aims to provide an LED lamp and an LED lamp circuit thereof, so that system power consumption is effectively reduced, and heat generation is reduced.
In order to solve the above technical problem, in a first aspect, the present application discloses an LED lamp circuit, including:
a rectifier for rectifying an input alternating current to output a high voltage direct current;
the white light emitting circuit is connected with the output end of the rectifier and comprises a high-voltage DC-DC constant-current LED driver and a white light LED lamp bead string which are sequentially connected, and the high-voltage DC-DC constant-current LED driver is used for driving the white light LED lamp bead string in a constant-current mode;
the high-voltage DC-DC converter is connected with the output end of the rectifier and is used for converting the high-voltage direct current to output low-voltage direct current;
the color light emitting circuit is connected with the output end of the high-voltage DC-DC converter and comprises a linear constant-current LED driver and a color light LED lamp bead string which are connected in series; the linear constant-current LED driver is used for driving the color light LED lamp bead string in a constant current mode;
and the control circuit is connected with the output end of the high-voltage DC-DC converter and is used for outputting corresponding dimming signals to the high-voltage DC-DC constant-current LED driver and the linear constant-current LED driver.
Optionally, the color light LED lamp bead string includes a red light LED lamp bead string, a green light LED lamp bead string and a blue light LED lamp bead string connected in parallel.
Optionally, the linear constant current LED driver includes:
the first single-path linear constant-current LED driver is connected with the red LED lamp bead string in series;
the second single-path linear constant-current LED driver is connected with the green LED lamp bead string in series;
and the third single-path linear constant-current LED driver is connected with the blue LED lamp bead in series.
Optionally, the color light emitting circuit further comprises:
the first current limiting resistor is connected with the red LED lamp bead string and the first single-path linear constant-current LED driver in series;
the second current limiting resistor is connected with the green LED lamp bead string and the second single-path linear constant current LED driver in series;
and the third current limiting resistor is connected with the blue LED lamp bead string and the third one-way linear constant-current LED driver in series.
Optionally, the linear constant-current LED driver is a three-way linear constant-current LED driver; and three driving ends of the three linear constant-current LED drivers are respectively connected with the red LED lamp bead string, the green LED lamp bead string and the blue LED lamp bead string.
Optionally, a connection interface between the three-way linear constant-current LED driver and the control circuit includes any one or any combination of the following:
an I2C interface, an SPI interface and an IO interface.
Optionally, the control circuit includes a power conversion circuit and a control unit connected in sequence;
the power supply conversion circuit is used for carrying out voltage reduction and voltage stabilization conversion on the low-voltage direct current and outputting working voltage for supplying power to the control unit;
the control unit is integrated with a wireless module for receiving wireless instructions, and the control unit is used for outputting the dimming signals corresponding to the wireless instructions.
Further, the application also discloses an LED lamp comprising any one of the LED lamp circuits described above.
The application provides an LED lamp circuit includes: a rectifier for rectifying an input alternating current to output a high voltage direct current; the white light emitting circuit is connected with the output end of the rectifier and comprises a high-voltage DC-DC constant-current LED driver and a white light LED lamp bead string which are sequentially connected, and the high-voltage DC-DC constant-current LED driver is used for driving the white light LED lamp bead string in a constant-current mode; the high-voltage DC-DC converter is connected with the output end of the rectifier and is used for converting the high-voltage direct current to output low-voltage direct current; the color light emitting circuit is connected with the output end of the high-voltage DC-DC converter and comprises a linear constant-current LED driver and a color light LED lamp bead string which are connected in series; the linear constant-current LED driver is used for driving the color light LED lamp bead string in a constant current mode; and the control circuit is connected with the output end of the high-voltage DC-DC converter and is used for outputting corresponding dimming signals to the high-voltage DC-DC constant-current LED driver and the linear constant-current LED driver.
Therefore, the high-voltage DC-DC constant-current LED driver working at high voltage is used for driving the white-light LED lamp bead string with high luminous power demand, and the linear constant-current LED driver working at low voltage is used for driving the color-light LED lamp bead string with low luminous power demand, so that the power consumption of the system can be effectively reduced, the heating is reduced, and the economic benefit of the product is improved. The LED lamp provided by the application also has the beneficial effects.
Drawings
In order to more clearly illustrate the technical solutions in the prior art and the embodiments of the present application, the drawings that are needed to be used in the description of the prior art and the embodiments of the present application will be briefly described below. Of course, the following description of the drawings related to the embodiments of the present application is only a part of the embodiments of the present application, and it will be obvious to those skilled in the art that other drawings can be obtained from the provided drawings without any creative effort, and the obtained other drawings also belong to the protection scope of the present application.
Fig. 1 is a schematic structural diagram of an LED lamp circuit disclosed in an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a specific LED lamp circuit disclosed in an embodiment of the present application;
fig. 3 is a schematic structural diagram of another specific LED lamp circuit disclosed in the embodiment of the present application.
Detailed Description
The core of the application lies in providing an LED lamp and an LED lamp circuit thereof, so as to effectively reduce system power consumption and reduce heat generation.
In order to more clearly and completely describe the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
At present, in order to perform color light dimming on an LED lamp, in the prior art, after a high-voltage DC-DC converter is used to obtain low-voltage direct current, a linear constant-current LED driver working at low voltage is used to drive all LED lamp bead strings including a white LED lamp bead string to be turned on. In fact, in the using process of a user, the luminous power of the white light LED lamp bead string is often required to be larger and is obviously higher than that of other colored LED lamp bead strings. A linear constant-current LED driver is adopted to drive the white-light LED lamp bead string, so that the system loss is increased, and the heating is serious. In view of this, the present application provides an LED lamp circuit, which can effectively solve the above problems.
Referring to fig. 1, an embodiment of the present application discloses an LED lamp circuit, which mainly includes:
a rectifier 1 for rectifying an input ac power to output a high voltage dc power;
the white light emitting circuit is connected with the output end of the rectifier 1 and comprises a high-voltage DC-DC constant-current LED driver 2 and a white light LED lamp bead string 3 which are sequentially connected, and the high-voltage DC-DC constant-current LED driver 2 is used for driving the white light LED lamp bead string 3 at a constant current;
a high voltage DC-DC converter 4 connected to an output terminal of the rectifier 1, for converting the high voltage direct current to output a low voltage direct current;
the color light emitting circuit is connected with the output end of the high-voltage DC-DC converter 4 and comprises a linear constant-current LED driver 5 and a color light LED lamp bead string 6 which are connected in series; the linear constant-current LED driver 5 is used for constant-current driving of the color LED lamp bead string 6;
and the control circuit 7 is connected with the output end of the high-voltage DC-DC converter 4 and is used for outputting corresponding dimming signals to the high-voltage DC-DC constant-current LED driver 2 and the linear constant-current LED driver 5.
It should be pointed out that, in this embodiment of the application, to white light LED lamp pearl cluster 3 and color light LED lamp pearl cluster 6, different drivers have been adopted respectively: because the requirement on the luminous power of the color light LED lamp bead string 6 is low, a linear constant current LED driver 5 which works with low-voltage direct current is adopted, and the high-voltage DC-DC converter 4 supplies power; and because the requirement of the luminous power of the white light LED lamp bead string 3 is large, the high-voltage DC-DC constant-current LED driver 2 which works by high-voltage direct current is adopted.
Specifically, the linear constant current LED driver 5 is used for constant current driving of the color light LED lamp bead string 6, does not include an inductor therein, does not perform voltage conversion, and is based on switching operation to realize linear constant current driving. It is easy to understand that there is a certain conversion efficiency in the DC-DC conversion process of the high-voltage DC-DC converter 4 and the constant current driving process of the linear constant current LED driver 5.
As the name suggests, the high-voltage DC-DC constant-current LED driver 2 for driving the white-light LED lamp bead string 3 is internally provided with an inductance device, not only carries out DC-DC conversion, but also realizes constant-current driving. It is easy to understand that, the high-voltage DC-DC constant-current LED driver 2 directly works with high-voltage direct current, and is powered by the rectifier 1, and compared with the low-voltage driving scheme of the high-voltage DC-DC converter 4 and the linear constant-current LED driver 5, the high-voltage DC-DC constant-current LED driver 2 has higher conversion efficiency.
Therefore, the white light LED lamp bead string 3 with high luminous power demand is driven by the high-voltage DC-DC constant current LED driver 2, and the color light LED lamp bead string 6 with low luminous power demand is driven by the linear constant current LED driver, so that the system power consumption can be effectively reduced, the heating is reduced, and the economic benefit of the product is improved.
The control circuit 7 can respectively send corresponding dimming signals to the high-voltage DC-DC constant-current LED driver 2 and the linear constant-current LED driver 5 to light the white-light LED lamp bead string 3 and/or the color-light LED lamp bead string 6.
As a specific embodiment, the control circuit 7 may include a power conversion circuit and a control unit connected in sequence;
the power supply conversion circuit is used for carrying out voltage reduction and voltage stabilization conversion on the low-voltage direct current and outputting working voltage for supplying power to the control unit; the control unit is integrated with a wireless module for receiving wireless instructions and is used for outputting dimming signals corresponding to the wireless instructions.
The LED lamp circuit provided by this embodiment includes: a rectifier 1 for rectifying an input ac power to output a high voltage dc power; the white light emitting circuit is connected with the output end of the rectifier 1 and comprises a high-voltage DC-DC constant-current LED driver 2 and a white light LED lamp bead string 3 which are sequentially connected, and the high-voltage DC-DC constant-current LED driver 2 is used for driving the white light LED lamp bead string 3 at a constant current; a high voltage DC-DC converter 4 connected to an output terminal of the rectifier 1, for converting the high voltage direct current to output a low voltage direct current; the color light emitting circuit is connected with the output end of the high-voltage DC-DC converter 4 and comprises a linear constant-current LED driver 5 and a color light LED lamp bead string 6 which are connected in series; the linear constant-current LED driver 5 is used for constant-current driving of the color LED lamp bead string 6; and the control circuit 7 is connected with the output end of the high-voltage DC-DC converter 4 and is used for outputting corresponding dimming signals to the high-voltage DC-DC constant-current LED driver 2 and the linear constant-current LED driver 5.
Therefore, the embodiment of the application utilizes the high-voltage DC-DC constant-current LED driver 2 working at high voltage to drive the white-light LED lamp bead string 3 with high luminous power demand, and utilizes the linear constant-current LED driver 5 working at low voltage to drive the color-light LED lamp bead string 6 with low luminous power demand, so that the power consumption of the system can be effectively reduced, the heating is reduced, and the economic benefit of the product is improved.
On the basis of the above content, as a specific implementation manner, in the LED lamp circuit provided in the embodiment of the present application, the color LED lamp bead string 6 includes a red LED lamp bead string, a green LED lamp bead string, and a blue LED lamp bead string that are connected in parallel.
The red, green and blue are three primary colors of color light, and the red, green and blue LED lamp bead strings can be matched with the white LED lamp bead string 3 to adjust the color temperature of the white light and can be randomly mixed to obtain other color lights. When color matching is needed, the control circuit 7 can light the LED lamp bead strings with the relevant colors so as to obtain the light color needed by the user; when the brightness needs to be adjusted, the control circuit 7 can increase or decrease the magnitude of the dimming signal of the corresponding LED lamp bead string to adjust the light flux; when the color temperature of the white light needs to be adjusted, the control circuit 7 can adjust the size ratio of the dimming signal corresponding to the white light LED lamp bead string 3 and the dimming signal corresponding to the other color light LED lamp bead strings 6. Common color temperatures include cold color temperature and warm color temperature, and the lower the color temperature, the warmer the hue, and the redder in color; the higher the color temperature, the cooler the hue, and the bluer in color.
Referring to fig. 2, the embodiment of the application discloses a specific structure of an LED lamp circuit.
As a specific implementation manner, an LED lamp circuit provided in an embodiment of the present application includes: a rectifier 1 for rectifying an input ac power to output a high voltage dc power; the white light emitting circuit is connected with the output end of the rectifier 1 and comprises a high-voltage DC-DC constant-current LED driver 2 and a white light LED lamp bead string 3 which are sequentially connected, and the high-voltage DC-DC constant-current LED driver 2 is used for driving the white light LED lamp bead string 3 at a constant current; a high voltage DC-DC converter 4 connected to an output terminal of the rectifier 1, for converting the high voltage direct current to output a low voltage direct current; the color light emitting circuit is connected with the output end of the high-voltage DC-DC converter 4 and comprises a linear constant-current LED driver 5 and a color light LED lamp bead string 6 which are connected in series; the linear constant-current LED driver 5 is used for constant-current driving of the color LED lamp bead string 6; and the control circuit 7 is connected with the output end of the high-voltage DC-DC converter 4 and is used for outputting corresponding dimming signals to the high-voltage DC-DC constant-current LED driver 2 and the linear constant-current LED driver 5.
On the basis of the above, further, the linear constant current LED driver 5 includes:
the first single-path linear constant-current LED driver is connected with the red LED lamp bead string in series;
the second single-path linear constant-current LED driver is connected with the green light LED lamp bead string in series;
and the third single-path linear constant-current LED driver is connected with the blue LED lamp bead in series.
It should be noted that, in this embodiment, for each color LED lamp bead string 6, including a red LED lamp bead string, a green LED lamp bead string, and a blue LED lamp bead string, the embodiments of the present application all use one single-path linear constant-current LED driver to drive. Generally, for a single-path linear constant-current LED driver, the dimming signal applied by the control circuit 7 may be specifically a PWM wave signal.
On the basis of the above, further, the color light emitting circuit further includes:
the first current limiting resistor R1 is connected with the red LED lamp bead string and the first single-path linear constant-current LED driver in series;
the second current limiting resistor R2 is connected with the green LED lamp bead string and the second single-path linear constant current LED driver in series;
and the third current limiting resistor R3 is connected with the blue LED lamp bead string and the third one-way linear constant-current LED driver in series.
Specifically, in this embodiment, a current-limiting resistor is further connected in series to each of the color light LED lamp bead strings 6, so that the current-limiting resistor is used to share the voltage across the color light LED lamp bead strings 6, and heat generation in the linear constant-current LED driver 5 is reduced.
It should be further noted that the connection sequence of the current-limiting resistor, the corresponding color light LED lamp bead string 6, and the single-path linear constant-current LED driver in the series circuit may be selected and set by a person skilled in the art, which is not limited in the present application.
Referring to fig. 3, the embodiment of the present application discloses a specific structure of another LED lamp circuit.
As another specific implementation manner, an LED lamp circuit provided in an embodiment of the present application includes: a rectifier 1 for rectifying an input ac power to output a high voltage dc power; the white light emitting circuit is connected with the output end of the rectifier 1 and comprises a high-voltage DC-DC constant-current LED driver 2 and a white light LED lamp bead string 3 which are sequentially connected, and the high-voltage DC-DC constant-current LED driver 2 is used for driving the white light LED lamp bead string 3 at a constant current; a high voltage DC-DC converter 4 connected to an output terminal of the rectifier 1, for converting the high voltage direct current to output a low voltage direct current; the color light emitting circuit is connected with the output end of the high-voltage DC-DC converter 4 and comprises a linear constant-current LED driver 5 and a color light LED lamp bead string 6 which are connected in series; the linear constant-current LED driver 5 is used for constant-current driving of the color LED lamp bead string 6; and the control circuit 7 is connected with the output end of the high-voltage DC-DC converter 4 and is used for outputting corresponding dimming signals to the high-voltage DC-DC constant-current LED driver 2 and the linear constant-current LED driver 5.
The linear constant-current LED driver 5 is a three-way linear constant-current LED driver; three driving ends of the three-path linear constant-current LED driver are respectively connected with the red light LED lamp bead string, the green light LED lamp bead string and the blue light LED lamp bead string.
It should be noted that, in this embodiment, three outputs of the three linear constant-current LED drivers are specifically used to respectively drive the red LED bead string, the green LED bead string, and the blue LED bead string. On this basis, the connection interface of the three-way linear constant-current LED driver and the control circuit 7 includes any one or any combination of the following:
an I2C interface, an SPI interface and an IO interface.
For the three-way linear constant-current LED driver, the dimming signal correspondingly adopted by the control circuit 7 may specifically be a PWM wave signal transmitted based on an IO interface, and may also specifically be a corresponding type of communication command signal transmitted based on an I2C interface or an SPI interface.
Further, the application also discloses an LED lamp comprising any one of the LED lamp circuits described above.
Therefore, the LED lamp disclosed by the application utilizes the high-voltage DC-DC constant current LED driver 2 working at high voltage to drive the white light LED lamp bead string 3 with high luminous power demand, and utilizes the linear constant current LED driver 5 working at low voltage to drive the color light LED lamp bead string 6 with low luminous power demand, so that the power consumption of a system can be effectively reduced, the heating is reduced, and the economic benefit of the product is improved.
For the specific content of the LED lamp, reference may be made to the foregoing detailed description of the LED lamp circuit, which is not repeated herein.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the equipment disclosed by the embodiment, the description is relatively simple because the equipment corresponds to the method disclosed by the embodiment, and the relevant parts can be referred to the method part for description.
It is further noted that, throughout this document, relational terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The technical solutions provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall into the protection scope of the present application.
Claims (8)
1. An LED lamp circuit, comprising:
a rectifier for rectifying an input alternating current to output a high voltage direct current;
the white light emitting circuit is connected with the output end of the rectifier and comprises a high-voltage DC-DC constant-current LED driver and a white light LED lamp bead string which are sequentially connected, and the high-voltage DC-DC constant-current LED driver is used for driving the white light LED lamp bead string in a constant-current mode;
the high-voltage DC-DC converter is connected with the output end of the rectifier and is used for converting the high-voltage direct current to output low-voltage direct current;
the color light emitting circuit is connected with the output end of the high-voltage DC-DC converter and comprises a linear constant-current LED driver and a color light LED lamp bead string which are connected in series; the linear constant-current LED driver is used for driving the color light LED lamp bead string in a constant current mode;
and the control circuit is connected with the output end of the high-voltage DC-DC converter and is used for outputting corresponding dimming signals to the high-voltage DC-DC constant-current LED driver and the linear constant-current LED driver.
2. The LED lamp circuit of claim 1, wherein the string of color LED beads comprises a string of red LED beads, a string of green LED beads, and a string of blue LED beads connected in parallel.
3. The LED lamp circuit of claim 2, wherein the linear constant current LED driver comprises:
the first single-path linear constant-current LED driver is connected with the red LED lamp bead string in series;
the second single-path linear constant-current LED driver is connected with the green LED lamp bead string in series;
and the third single-path linear constant-current LED driver is connected with the blue LED lamp bead in series.
4. The LED lamp circuit of claim 3, wherein the color light emitting circuit further comprises:
the first current limiting resistor is connected with the red LED lamp bead string and the first single-path linear constant-current LED driver in series;
the second current limiting resistor is connected with the green LED lamp bead string and the second single-path linear constant current LED driver in series;
and the third current limiting resistor is connected with the blue LED lamp bead string and the third one-way linear constant-current LED driver in series.
5. The LED lamp circuit according to claim 2, wherein the linear constant current LED driver is a three-way linear constant current LED driver; and three driving ends of the three linear constant-current LED drivers are respectively connected with the red LED lamp bead string, the green LED lamp bead string and the blue LED lamp bead string.
6. The LED lamp circuit according to claim 5, wherein the connection interface of the three-way linear constant-current LED driver and the control circuit comprises any one or any combination of the following:
an I2C interface, an SPI interface and an IO interface.
7. The LED lamp circuit according to any one of claims 1 to 6, wherein the control circuit comprises a power conversion circuit and a control unit which are connected in sequence;
the power supply conversion circuit is used for carrying out voltage reduction and voltage stabilization conversion on the low-voltage direct current and outputting working voltage for supplying power to the control unit;
the control unit is integrated with a wireless module for receiving wireless instructions, and the control unit is used for outputting the dimming signals corresponding to the wireless instructions.
8. An LED lamp comprising an LED lamp circuit according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920865589.XU CN210274622U (en) | 2019-06-10 | 2019-06-10 | LED lamp and LED lamp circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920865589.XU CN210274622U (en) | 2019-06-10 | 2019-06-10 | LED lamp and LED lamp circuit thereof |
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| CN210274622U true CN210274622U (en) | 2020-04-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111556618A (en) * | 2020-05-28 | 2020-08-18 | 青岛亿联客信息技术有限公司 | Multichannel light modulation lamp and multichannel lighting equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111556618A (en) * | 2020-05-28 | 2020-08-18 | 青岛亿联客信息技术有限公司 | Multichannel light modulation lamp and multichannel lighting equipment |
| CN111556618B (en) * | 2020-05-28 | 2023-10-31 | 青岛亿联客信息技术有限公司 | Multichannel dimming lamp and multichannel lighting equipment |
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