A light-emitting device and lamp integrating multi-level CCT and DTW

Abstract

The present application proposes a light-emitting device integrating multi-level CCT and DTW, including a driving circuit, the driving circuit including: a CCT branch, the CCT branch including: a first high color temperature LED string group; a CCT color temperature switching circuit, the CCT color temperature switching circuit including a multi-level switch, configured to adjust the input current of the first high color temperature LED string group; a DTW branch, the DTW branch including: a low color temperature LED string group, the voltage drop of the low color temperature LED string group is less than the voltage drop of the first high color temperature LED string group; a control module, configured to realize that when the input voltage of the driving circuit gradually increases, the light-emitting state of the low color temperature LED string group changes from high brightness to dimming or no brightness; the multi-level switch also selectively connects the CCT branch with the control module, thereby controlling the conduction or disconnection of the CCT branch and the DTW branch. The present application realizes CCT and DTW multi-level dimming and color adjustment through a simple circuit design, which is suitable for circuit integration design.

Description

Technical Field

[0001] The present application relates to the field of lighting, and in particular to a light-emitting device and a lamp integrating multi-level CCT and DTW. Background Art

[0002] Currently, many home lighting products have multi-level dimming and color adjustment functions, which are usually achieved by using a multi-light source mixed color driving circuit working mode. The circuit is complex and the development cycle is long. This complex design is not suitable for Drive on Board (DOB light engine).

[0003] In view of this, the present application manufactures a light-emitting device and lamp that integrates multi-level CCT (correlated colour temperature) and DTW (Dim To Warm), and realizes the multi-level dimming and colour adjustment function of the lighting product through a simple circuit structure. Summary of the invention

[0004] In order to solve the technical problem that the circuit design of existing lighting products to achieve multi-level dimming and color adjustment functions is relatively complex, the present application provides a light-emitting device and a lamp integrating multi-level CCT and DTW to solve the above technical problem.

[0005] According to a first aspect of the present application, a light emitting device integrating multi-level CCT and DTW is proposed, including a driving circuit, wherein the driving circuit includes:

[0006] A CCT branch, wherein the CCT branch comprises:

[0007] a first high color temperature LED string group configured to generate light of a corresponding CCT color temperature;

[0008] A CCT color temperature switching circuit, wherein the CCT color temperature switching circuit comprises a multi-position switch, wherein the multi-position switch is configured to adjust an input current of the first high color temperature LED string group, thereby adjusting the first high color temperature LED string group to generate light corresponding to different CCT color temperatures;

[0009] The DTW branch includes:

[0010] A low color temperature LED string group is arranged in parallel with the first high color temperature LED string group, configured to generate warm light, and a voltage drop of the low color temperature LED string group is smaller than a voltage drop of the first high color temperature LED string group;

[0011] A control module configured to realize that when the input voltage of the driving circuit gradually increases, the light emitting state of the low color temperature LED string group changes from high brightness to dim brightness or no brightness;

[0012] The multi-position switch also selectively connects the CCT branch with the control module, thereby controlling the on or off of the CCT branch and the DTW branch.

[0013] Through the above technical solution, the multi-position switch is used to adjust the first high color temperature LED string group where the branch

[0014] The input current of the circuit, at this time, only the CCT branch of the driving circuit is turned on, and the first high color temperature LED string group produces corresponding different CCT color temperatures; the multi-position switch is switched to the state of connecting the CCT branch and the control module. When the input voltage value of the driving circuit is small, since the voltage drop of the low color temperature LED string group is smaller than the voltage drop of the first high color temperature LED string group, that is, the starting voltage is small, the branch where the low color temperature LED string group is located is started first, and the low color temperature LED string group is lit to produce warm light, and the first high color temperature LED string group is not started and lit; as the input voltage of the driving circuit continues to increase, when the starting voltage of the first high color temperature LED string group is reached, the branch where the first high color temperature LED string group is located is started, and the first high color temperature LED string group is lit to produce light with a higher color temperature (cold light). At the same time, the control module controls the luminous state of the low color temperature LED string group from high brightness to slightly bright or not bright, that is, the main current of the driving circuit is input to the low color temperature LED string group from the beginning, and gradually most of the current is distributed to the first high color temperature LED In this process, the LED light emitting state changes from warm light to warm light and from cold light to cold light, thus mixing the colors to obtain the DTW functional color temperature.

[0015] Preferably, the CCT color temperature switching circuit further includes at least two first adjustment resistors connected in parallel to the first high color temperature LED string group branch, and the multi-position switch is configured to select the first adjustment resistors of different positions connected to the first high color temperature LED string group, so as to generate light corresponding to different CCT color temperatures. According to the above technical solution, the branch current of the branch where the first high color temperature LED string group is located changes by selecting the first adjustment resistors of different positions connected to the multi-position switch, and the first high color temperature LED string group can generate light of specific different CCT color temperatures.

[0016] Preferably, the CCT color temperature switching circuit further comprises a first transistor connected in series to the first high color temperature LED string group branch, and the at least two first adjustment resistors are coupled in parallel to the emitter of the first transistor. Through the above technical solution, by adding the first transistor, a constant current effect can be achieved, so that the current flowing through the first high color temperature LED string group is more stable.

[0017] Preferably, there are at least two first high color temperature LED string groups, and the multi-position switch is configured to select the first adjustment resistors of the same position connected to branches where different first high color temperature LED string groups are located, so as to mix colors to obtain light corresponding to different CCT color temperatures.

[0018] Through the above technical scheme, the CCT color temperature obtained by mixing colors of at least two groups of first high color temperature LED strings is more accurate, and the same-position first adjustment resistors of the branches where different first high color temperature LED strings are located are selected to be connected through the multi-position switch, the branch currents of the branches where different first high color temperature LED strings are located change, and the color temperatures of the cooler colored lights generated by the different first high color temperature LED strings change, and cooler colored lights with different CCT color temperatures can be obtained after color mixing.

[0019] Preferably, the CCT branch further includes a second high color temperature LED string group, which is arranged in parallel with the first high color temperature LED string group and is configured to generate light of a corresponding CCT color temperature, and the voltage drop of the low color temperature LED string group is smaller than the voltage drop of the second high color temperature LED string group, and the multi-position switch selectively connects the control module and the second high color temperature LED string group, thereby controlling the conduction or shutoff of the CCT branch and the DTW branch.

[0020] Through the above technical solution, by adding a second high color temperature LED string group, the DTW branch and the CCT branch do not have a common LED string group. When the DTW branch is working, there is no need to first adjust the CCT color temperature obtained after the CCT branch mixes the colors. You can directly select the second high color temperature LED string group with the required CCT color temperature, and then mix the colors with the low color temperature LED string group.

[0021] Preferably, the multi-position switch selectively connects the control module with a group of the first high color temperature LED strings, thereby controlling the on or off of the CCT branch and the DTW branch.

[0022] Through the above technical solution, when the DTW branch is working, the DTW branch and the CCT branch share a group of first high color temperature LED strings, and the CCT color temperature obtained after the CCT branch is mixed is adjusted by the multi-position switch, and then mixed with the low color temperature LED string group to achieve DTW dimming and color adjustment. Preferably, the branches where the different first high color temperature LED strings are located are all connected in series with second adjustment resistors, and the other ends of the different second adjustment resistors are connected in common, and the multi-position switch selects and connects the control module and the end of the different second adjustment resistors to control the conduction or disconnection of the CCT branch and the DTW branch.

[0023] Through the above technical solution, when the DTW branch is working, the DTW branch and the CCT branch share all the first high color temperature LED string groups, and the CCT color temperature obtained after the CCT branch color mixing is adjusted by the multi-position switch, and then mixed with the low color temperature LED string group to achieve DTW dimming and color adjustment.

[0024] Preferably, the low color temperature LED string group is designed so that the number of low color temperature LEDs connected in series therein is smaller than the number of high color temperature LEDs connected in series in the first high color temperature LED string group and / or the second high color temperature LED string group, so that the voltage drop of the low color temperature LED string group is smaller than the voltage drop of the first high color temperature LED string group and / or the second high color temperature LED string group.

[0025] Through the above technical solution, by different numbers of LEDs connected in series, the voltage drop of the low color temperature LED string group is achieved to be smaller than the voltage drop of the first high color temperature LED string group and / or the second high color temperature LED string group, so that in the process of gradually increasing the input voltage of the driving circuit, the low color temperature LED string group starts and lights up first, and the first high color temperature LED string group and / or the second high color temperature LED string group starts and lights up later.

[0026] Preferably, it also includes a voltage regulating device configured to regulate the input voltage of the driving circuit.

[0027] Preferably, the control module is a constant current controller.

[0028] Through the above technical solution, when the input voltage value of the driving circuit is small, the constant current controller is turned on and the low color temperature LED string group works normally. When the input voltage of the driving circuit gradually increases, the impedance of the branch where the low color temperature LED string group is located gradually increases. After reaching the threshold, the constant current controller is automatically disconnected, and the low color temperature LED string group becomes dark.

[0029] Preferably, the control module is a first current limiting resistor.

[0030] Through the above technical solution, when the input voltage value of the driving circuit is small, only the low color temperature LED

[0031] When the LED string group starts, the main current all flows to the low color temperature LED string group, and the low color temperature LED string group works normally; when the input voltage of the driving circuit gradually increases, the first high color temperature LED string group or the second high color temperature LED string group starts to start and light up, and the first current limiting resistor reduces the branch current flowing through the low color temperature LED string group, and most of the current flows to the first high color temperature LED string group or the second high color temperature LED string group, and the low color temperature LED string group becomes slightly bright.

[0032] Preferably, the multi-position switch is a double-dip switch.

[0033] Through the above technical solution, the first adjustment resistance gear is switched by the mechanical dial switch. Preferably, the multi-gear switch is a wireless control switch, and the wireless control switch includes: an antenna configured to cooperate with the RF circuit to realize the reception and transmission of electromagnetic waves;

[0034] The RF circuit is configured to receive the dimming and color adjustment gear information of the current light emitting device,

[0035] Sending a gear switching signal for the light emitting device to an electronic switch;

[0036] The electronic switch is configured to execute the dimming and color adjustment gear switching action of the light emitting device. Through the above technical solution, the dimming and color adjustment of the light emitting device is controlled by wireless control.

[0037] Gear position, operation is simpler and more convenient.

[0038] Preferably, it also includes a power supply circuit, and the power supply circuit includes:

[0039] a rectifier bridge configured to provide a rectified AC signal;

[0040] The ripple elimination circuit is connected to the rectifier bridge and the driving circuit and is configured to receive the rectifier

[0041] The AC signal after the flow and the ripple is eliminated;

[0042] The control circuit is connected to the driving circuit to form a loop, and is configured to achieve stable current distribution to the branch where the first high color temperature LED string group or the second high color temperature LED string group and / or the low color temperature LED string group are located when the CCT branch and / or the DTW branch is turned on.

[0043] Through the above technical solution, the rectifier bridge rectifies the AC signal and eliminates the ripple in the rectified AC signal, so that the response speed of the LED string group is accelerated, the LED flickering will not occur, and the service life of the LED is increased.

[0044] According to a second aspect of the present application, a lamp is provided, comprising the light emitting device as described above.

[0045] Preferably, the lamp comprises:

[0046] A face ring, wherein one end of the face ring is closed and the other end is recessed to form a first accommodation space;

[0047] An elastic mounting structure, the elastic mounting structure is fixed to one end of the face ring in a closed arrangement and is used for mounting the face ring;

[0048] A first light source, the driving circuit and the power supply circuit are integrated in the first light source, and the first light source and the voltage regulating device are built in the first accommodation space;

[0049] A light guide is arranged at one end of the face ring recessed and is used to close the first accommodating space.

[0050] Through the above technical solution, the face ring is suspended by the elastic mounting structure, the driving circuit and the control circuit are integrated in the first light source, and the light emitted by the first light source is scattered by the light guide.

[0051] Preferably, the lamp includes a lamp panel, a lampshade, a second light source and a driver, one end of the lamp panel is used to be fixed on the ceiling, and the other end covers the lampshade to form a second storage space, the driving circuit and the power supply circuit are integrated in the second light source, the second light source and the driver are electrically connected, and the second light source, the driver and the voltage regulating device are built into the second storage space.

[0052] Through the above technical solution, the lamp panel is suspended on the ceiling, the driving circuit and the control circuit are integrated in the second light source, and the operation of the second light source is controlled by driving, and the light of the second light source is scattered through the lampshade.

[0053] The present application proposes a light-emitting device and lamp that integrates multi-level CCT and DTW. The light-emitting device switches between CCT working mode and DTW working mode through a multi-level switch. When the multi-level switch chooses to connect to the multi-level first adjustment resistor, only the CCT branch is turned on, and the light-emitting device enters the CCT working mode. The first adjustment resistor adjusts the input current of the branch where the first high color temperature LED string group is located. The first high color temperature LED string group generates colder colored light with different CCT color temperatures alone or by mixing colors. When the multi-level switch chooses to connect the CCT branch and the control module, the light-emitting device enters the DTW working mode. When the input voltage value of the driving circuit is small, the voltage drop of the low color temperature LED string group is smaller than the voltage drop of the first high color temperature LED string group and the second high color temperature LED string group, that is, the starting voltage

[0054] The branch where the LED string group with a smaller color temperature is located is started first, and the LED string group with a low color temperature is lit to produce warm light.

[0055] The first high color temperature LED string group or the second high color temperature LED string group is not started and lit; then the input voltage of the driving circuit is continuously increased by using the voltage regulating device, and when the starting voltage of the first high color temperature LED string group and / or the second high color temperature LED string group is reached, the branch where the first high color temperature LED string group or the second high color temperature LED string group is located is started, and the first high color temperature LED string group or the second high color temperature LED string group is lit to produce a relatively cold light. At the same time, the control module controls the light-emitting state of the low color temperature LED string group from high brightness to slightly bright or not bright, that is, the main current of the driving circuit is input to the low color temperature LED string group from the beginning, and most of the current is gradually distributed to the first high color temperature LED string group or the second high color temperature LED string group. In this process, the LED light-emitting state changes from warm light-warm light and relatively cold light mixed color-relatively cold light, so as to obtain the DTW functional color temperature through color mixing. The present application can realize multi-level CCT color temperature switching and realize the DTW color temperature switching working mode, and the circuit structure is simple, which is suitable for the development trend of integrated circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated into and constitute a part of this specification. The accompanying drawings illustrate the embodiments and are used together with the description to explain the principles of the present application. It will be easy to recognize other embodiments and many expected advantages of the embodiments because they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale with each other. The same reference numerals refer to corresponding similar parts.

[0057] FIG1 is a structural block diagram of a light emitting device according to an embodiment of the present application;

[0058] FIG2 is a functional block diagram of a circuit portion of a light emitting device according to an embodiment of the present application;

[0059] FIG3 is a schematic diagram of the circuit structure of the circuit part of the light emitting device according to the first specific embodiment of the present application;

[0060] FIG4 is a schematic diagram showing a circuit structure of a driving circuit according to the first specific embodiment of the present application;

[0061] FIG5 is a circuit block diagram of a wireless control switch according to an embodiment of the present application;

[0062] FIG6 is a schematic diagram of a circuit structure of a driving circuit according to a second specific embodiment of the present application;

[0063] FIG7 is a schematic diagram of a circuit structure of a driving circuit according to a third specific embodiment of the present application;

[0064] FIG8 is a schematic diagram of a circuit structure of a driving circuit according to a fourth specific embodiment of the present application;

[0065] Fig. 9 The light emitting device according to the embodiment of the present application realizes multi-level CCT under the control of MCU

[0066] And the circuit structure diagram of DTW color temperature switching;

[0067] FIG10 is a schematic diagram of an MCU and its peripheral circuits according to an embodiment of the present application;

[0068] FIG11 is a diagram showing a dimming and color adjustment curve of a light emitting device in a DTW mode according to a fourth specific embodiment of the present application;

[0069] FIG12 is a light mixing curve diagram of a light emitting device according to a fourth specific embodiment of the present application;

[0070] FIG13 is a schematic structural diagram of a lamp according to a specific embodiment of the present application;

[0071] FIG14 is a schematic structural diagram of a lamp according to a specific embodiment of the present application for highlighting the first light source;

[0072] FIG15 is a schematic structural diagram of a lamp according to another specific embodiment of the present application;

[0073] FIG. 16 is a diagram showing a structure of a lamp according to another specific embodiment of the present application in order to highlight the second light source.

[0074] Schematic diagram.

[0075] The meaning of the numbers in the figure: 10, light-emitting device; 11, power supply; 12, power supply circuit; 121,

[0076] Rectifier bridge; 122, ripple elimination circuit; 123, control circuit; 1231, constant current control chip; 13, drive circuit; 131, CCT branch; 1311, first high color temperature LED string group; 1312, CCT color temperature switching circuit; 13121, multi-position switch; 13122, first adjustment resistor; 13123, first transistor; 13124, voltage-stabilizing resistor; 13125, second transistor; 13126, second adjustment resistor; 13127, third adjustment resistor; 1313, second high color temperature LED string group; 132, DTW branch; 1321, low color temperature LED String group; 1322, control module; 13221, constant current controller; 13222, second current limiting resistor; 13223, first current limiting resistor; 14, voltage regulating device; 21, face ring; 211, first accommodating space; 22, elastic mounting structure; 23, first light source; 24, light guide; 31, lamp panel; 311, second accommodating space; 32, lampshade; 33, second light source; 34, drive; 100, antenna; 200, RF circuit; 300, electronic switch. DETAILED DESCRIPTION

[0077] In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and

[0078] It is shown by way of illustrative specific embodiments in which the present application can be practiced. In this regard, reference is made to the drawings described.

[0079] Directional terms are used to refer to the orientation of the device, such as "top", "bottom", "left", "right", "up", "down", etc. Because the components of the embodiments can be positioned in several different orientations, the directional terms are used for illustrative purposes and are by no means limiting. It should be understood that other embodiments may be utilized or logical changes may be made without departing from the scope of the present application. Therefore, the following detailed description should not be taken in a limiting sense, and the scope of the present application is defined by the appended claims. According to the first aspect of the present application, a multi-speed CCT and DTW integrated device is proposed.

[0080] Light emitting equipment.

[0081] FIG. 1 shows a structural block diagram of a light emitting device according to an embodiment of the present application. As shown in FIG. 1 ,

[0082] The light emitting device 10 includes a power supply 11, a power supply circuit 12, a driving circuit 13 and a voltage regulating device 14. The power supply 11 provides an AC signal to the power supply circuit 12. The power supply circuit 12 processes the AC signal and provides a stable input signal (input voltage Vin, input current Iin) to the driving circuit 13. The driving circuit 13 forms a loop through the power supply circuit 12. The voltage regulating device 14 regulates the input voltage of the driving circuit 13. The driving circuit 13 is used to realize multi-level CCT color temperature switching and realize the DTW color temperature switching working mode, so as to obtain a variety of CCT color temperatures and DTW functional color temperatures. In this embodiment, the voltage regulating device 14 specifically adopts a dimmer. In other embodiments, other devices may also be used.

[0083] The input voltage of the driving circuit 13 is adjusted by the setting or circuit.

[0084] FIG2 shows a functional block diagram of a circuit portion of a light emitting device according to an embodiment of the present application. As shown in FIG2 , the power supply circuit 12 includes a rectifier bridge 121, a ripple elimination circuit 122, and a control circuit 123. The rectifier bridge 121 rectifies the AC signal output by the power supply 11, the ripple elimination circuit 122 receives the rectified AC signal and eliminates the ripple, and then supplies it to the drive circuit 13. The control circuit 123 connects the rectifier bridge 121, the ripple elimination circuit 122, and the drive circuit 13 to form a loop, and when the drive circuit 13 is working, the control circuit 123 can realize the stable distribution of current to each branch in the drive circuit 13.

[0085] FIG3 shows a schematic diagram of the circuit structure of the circuit part of the light emitting device according to the first specific embodiment of the present application. As shown in FIG3, the control circuit 123 is composed of a constant current control chip 1231 and its peripheral circuits. In this embodiment, the specific model of the constant current control chip 1231 is OB5656.

[0086] In other implementations, other chips such as SY59101 may be used instead. The driving circuit 13 includes a CCT branch 131 and a DTW branch 132. The CCT branch 131 is used to implement multi-level CCT color temperature switching; the DTW branch 132 is used to implement DTW color temperature switching, and at the same time, is used to implement the switching of the driving circuit 13 from the CCT working mode to the DTW working mode.

[0087] It should be noted that the control circuit 123 used in this embodiment is a constant current, constant voltage linear control circuit. In other implementations, the control circuit 123 can be designed into a corresponding isolation switch circuit, non-isolation switch circuit, DC-DC control circuit, etc. according to project design requirements.

[0088] FIG4 shows a schematic diagram of a circuit structure for highlighting a driving circuit according to the first specific embodiment of the present application. As shown in FIG4 , the CCT branch 131 includes a first high color temperature LED string group 1311 and a CCT color temperature switching circuit 1312. The first high color temperature LED string group 1311 is used to generate a colder color light with a corresponding CCT color temperature; the CCT color temperature switching circuit 1312 includes a multi-position switch 13121 and a multi-position first adjustment resistor 13122, the multi-position first adjustment resistor 13122 is connected in parallel to the branch where the first high color temperature LED string group 1311 is located, and the multi-position switch 13121 is used to select the first adjustment resistor 13122 of different positions connected to the first high color temperature LED string group 1311, so as to adjust the first high color temperature LED string group 1311 to generate a colder color light corresponding to different CCT color temperatures, thereby realizing multi-position CCT color temperature switching.

[0089] In the present embodiment, two groups of the first high color temperature LED string groups 1311 are provided, and there is a color temperature difference between the two groups of the first high color temperature LED string groups 1311, and a colder color light corresponding to the CCT color temperature is generated by mixing the colors of the two groups of the first high color temperature LED string groups 1311. In other embodiments, the first high color temperature LED string groups 1311 can be provided as one group, and the colder color light corresponding to the CCT color temperature is directly generated without color mixing, and the color temperature of the obtained colder color light has a large error with the target color temperature required for the actual project; the first high color temperature LED string groups 1311 can also be provided as more than 2 groups, and the colder color light corresponding to the CCT color temperature is generated by mixing the colors of more groups of the first high color temperature LED string groups 1311, and the color temperature of the obtained colder color light has a smaller error with the target color temperature required for the actual project.

[0090] In this embodiment, the first adjustment circuit of the branch where the two first high color temperature LED string groups 1311 are located

[0091] The resistors 13122 are each provided with 5 levels. When the 5 levels of the first adjustment resistors 13122 are connected respectively, the CCT color temperatures obtained after the two groups of first high color temperature LED strings 1311 are mixed are 2700K, 3000K, 3500K, 4000K, and 5000K respectively. In other implementations, the number of levels of CCT color temperature switching can be set to other levels according to project requirements.

[0092] In this embodiment, the multi-position switch 13121 adopts a 6-position mechanical double-dip switch, and 5 of the positions of the multi-position switch 13121 are used to respectively select the 5-position first adjustment resistor 13122 of the branch where the two groups of first high color temperature LED string groups 1311 are located. In other implementations, the multi-position switch 13121 can also be a wireless control switch, that is, the dimming and color adjustment position of the light-emitting device 10 is adjusted by wireless control. The specific implementation is as follows:

[0093] FIG5 shows a circuit block diagram of a wireless control switch according to an embodiment of the present application. As shown in FIG5 , the wireless control switch includes an antenna 100, an RF circuit 200 and an electronic switch 300. The antenna 100 cooperates with the RF circuit 200 to realize the reception and transmission of electromagnetic waves; the RF circuit 200 is used to receive the dimming and color adjustment gear information of the current light-emitting device 10, and then send a gear switching signal for the light-emitting device 10 to the electronic switch; the electronic switch 300 is used to execute the dimming and color adjustment gear switching action of the light-emitting device 10. In this embodiment, the RF circuit 200 can also send a gear switching signal to the electronic switch 300 in combination with the control of the MCU. The electronic switch 300 includes but is not limited to a rotary code switch and a touch screen switch.

[0094] In this embodiment, the CCT color temperature switching circuit 1312 further includes a first transistor 13123 connected in series to the branch where the first high color temperature LED string group 1311 is located, and a 5-level first adjustment resistor 13122 is coupled in parallel to the emitter of the first transistor 13123. By adding the first transistor 13123, a constant current effect can be achieved, so that the current flowing through the first high color temperature LED string group 1311 is more stable.

[0095] In this embodiment, the bases of the two first transistors 13123 are connected to a voltage-stabilizing resistor 13124.

[0096] The voltage-stabilizing resistor 13124 provides a reference voltage to the two first transistors 13123 .

[0097] Continuing to refer to FIG. 4 , the DTW branch 132 includes a low color temperature LED string group 1321 and a control module 1322. The low color temperature LED string group 1321 is connected in parallel with two groups of first high color temperature LED string groups 1311 to generate warm light with a lower color temperature, and the voltage drop of the low color temperature LED string group 1321 is smaller than the voltage drop of the first high color temperature LED string group 1311. The control module 1322 is selectively connected to one of the first high color temperature LED string groups 1311 through the 6th gear of the multi-gear switch 13121. When the input voltage of the driving circuit is gradually increased by adjusting the voltage regulating device 14, the control module 1322 can make the light emitting state of the low color temperature LED string group 1321 tend to be dim from high brightness. Overall, one of the first high color temperature LED string groups 1311 and the control module 1322 is selected to be connected through the multi-position switch 13121. When the first high color temperature LED string group 1311 and the control module 1322 are disconnected, the DTW branch 132 does not work, and only the CCT branch 131 works, and the drive circuit 13 is in a multi-position CCT color temperature switching mode; when the first high color temperature LED string group 1311 and the control module 1322 are connected, the CCT branch 131 and the DTW branch 132 work alternately, and the drive circuit 13 switches to the DTW color temperature switching mode.

[0098] In this embodiment, the control module 1322 is a constant current controller 13221, a multi-position switch 13121

[0099] Select one of the first high color temperature LED string groups 1311 and the output end of the constant current controller 13221 to be connected. When the input voltage value of the driving circuit is small, the impedance of the DTW branch 132 is low, the constant current controller 13221 is turned on, and the low color temperature LED string group 1321 works normally; when the input voltage of the driving circuit is gradually increased by adjusting the voltage regulating device 14, the impedance of the DTW branch 132 gradually increases, and the constant current controller 13221 automatically disconnects after reaching the threshold, and the low color temperature LED string group 1321 becomes dark.

[0100] In this embodiment, the specific model of the constant current controller 13221 is PT4515. In other implementations, other models such as BP5111 or IML8686 may also be used.

[0101] In this embodiment, the output end of the constant current controller 13221 is connected in series with a second current limiting resistor 13222.

[0102] The second current limiting resistor 13222 can make the control of the constant current controller 13221 more precise.

[0103] In this embodiment, the low color temperature LED string group 1321 is designed to have low color temperature LEDs.

[0104] The number of LEDs connected in series is less than the number of high color temperature LEDs in the first high color temperature LED string group 1311, so that the voltage drop of the low color temperature LED string group 1321 is less than the voltage drop of the first high color temperature LED string group 1311. Those skilled in the art should understand that in other implementations, without departing from the implementation principle of the present application, other methods to achieve that the voltage drop of the low color temperature LED string group 1321 is less than the voltage drop of the first high color temperature LED string group 1311 should also fall within the protection scope of the present application.

[0105] In summary, the implementation principle of the first specific embodiment of the present application is:

[0106] 1. Multi-level CCT color temperature switching working mode

[0107] Use the multi-position switch 13121 to select and connect two groups of first high color temperature LED string groups 1311 respectively.

[0108] In the first adjustment resistor 13122 with 5 different gears, only the CCT branch 131 is turned on, and the DTW circuit 132 is not turned on. The input current of the branch where the two groups of first high color temperature LED string groups 1311 are located changes accordingly, so that the two groups of first high color temperature LED string groups 1311 produce different color temperatures and mix colors into different CCT color temperatures, thereby realizing multi-gear CCT color temperature switching.

[0109] 2. DTW dimming and color adjustment switching mode

[0110] When the multi-position switch 13121 is switched to connect one of the first high color temperature LED string groups 1311

[0111] When the control module 1322 is connected, only one of the branches where the first high color temperature LED string group 1311 is located and the DTW branch 132 are turned on, that is, the DTW branch 132 shares one of the first high color temperature LED string groups 1311 of the CCT branch 131. At the beginning, when the input voltage value of the driving circuit 13 is small, since the voltage drop of the low color temperature LED string group 1321 is smaller than the voltage drop of the first high color temperature LED string group 1311, that is, the starting voltage is small, the branch where the low color temperature LED string group 1321 is located is started first, the low color temperature LED string group 1321 is lit to produce warm light, and the first high color temperature LED string group 1311 is not lit. As the voltage regulating device 14 adjusts the input voltage of the driving circuit to increase continuously, when the starting voltage of the first high color temperature LED string group 1311 is reached, the branch where the first high color temperature LED string group 1311 is located starts to start, and the first high color temperature LED string group 1311 is turned on to produce light with a higher color temperature (cold light), and is mixed with the warm light produced by the low color temperature LED string group 1321. At the same time, the impedance of the DTW branch 132 gradually increases, and finally the constant current controller 13221 is turned off, and the low color temperature LED string group 1321 becomes dark, that is, the main current of the driving circuit 13 is input to the low color temperature LED string group 1321 from the beginning, and the current is gradually tilted and distributed to the branch where the first high color temperature LED string group 1311 is located. In this process, the LED light emitting state changes from warm light-warm light and cold light mixed-cold light, so as to obtain the DTW functional color temperature by mixing colors.

[0112] FIG6 shows a schematic diagram of the circuit structure of a driving circuit according to a second specific embodiment of the present application. Figure 6 As shown, the difference from the first specific embodiment is that the CCT branch 131 in this embodiment further includes a second high color temperature LED string group 1313, which is used to generate a cooler color light with a corresponding CCT color temperature. The second high color temperature LED string group 1313 and the two first high color temperature LED string groups 1311

[0113] The low color temperature LED string group 1321 is connected in parallel, and the low color temperature LED string group 1321 has a low color temperature.

[0114] The number of LEDs connected in series is also smaller than the number of high color temperature LEDs connected in series in the second high color temperature LED string group 1313, so that the voltage drop of the low color temperature LED string group 1321 is smaller than the voltage drop of the second high color temperature LED string group 1313. The sixth gear of the multi-gear switch 13121 selects the connection between the second high color temperature LED string group 1313 and the second current limiting resistor 13222 at the output end of the constant current controller 13221.

[0115] The implementation principle of the second specific embodiment of the present application is:

[0116] By adding the second highest color temperature LED string group 1313, the DTW branch 132 and the CCT branch 131 do not have a common LED string group. In the DTW dimming and color adjustment working mode, the second highest color temperature LED string group 1313 with the required CCT color temperature is directly selected according to the project design requirements, and then DTW dimming and color adjustment can be performed with the low color temperature LED string group 1321.

[0117] FIG. 7 shows a schematic diagram of a circuit structure of a driving circuit according to a third specific embodiment of the present application. Figure 7 As shown, the difference from the first specific embodiment is that the branches where the two groups of first high color temperature LED string groups 1311 are located are respectively connected in series with the second transistors 13125 arranged in parallel with the first transistor 13123, and the emitters of the two second transistors 13125 are respectively coupled in series with the second regulating resistors 13126, and the other ends of the two second regulating resistors 13126 are connected in common. The 6th gear of the multi-gear switch 13121 selects and connects one end commonly connected to the two second regulating resistors 13126 and the second current limiting resistor 13222 at the output end of the constant current controller 13221.

[0118] The implementation principle of the third specific embodiment of the present application is:

[0119] By adding two second transistors 13125 and two second adjustment resistors 13126, the second adjustment

[0120] The resistor 13126 can also change the input current of the branch where the first high color temperature LED string group 1311 is located, thereby changing the light of the corresponding CCT color temperature generated by the two groups of first high color temperature LED string groups 1311 after mixing colors. When the multi-position switch 13121 connects the two second adjustment resistors 13126 and the control module 1322, the DTW branch 132 is equivalent to the two groups of first high color temperature LED string groups 1311 that share the CCT branch 131. Compared with the first specific embodiment, the common point of this embodiment is that the second transistor 13125

[0121] The second current limiting resistor 13126 has the same function as the first transistor 13123 and the first adjusting resistor 13122, which is to obtain the CCT color temperature; the difference is that the first adjusting resistor 13122 of the first specific embodiment is set with multiple gears to obtain multiple gears of CCT color temperature, and the DTW branch 132 only shares one group of the first high color temperature LED string groups 1311 of the CCT branch 131, while the second current limiting resistor 13126 of this embodiment has only one gear, can only obtain a fixed color temperature, and the DTW branch 132 shares two groups of the first high color temperature LED string groups 1311 of the CCT branch 131.

[0122] FIG8 shows a schematic diagram of the circuit structure of a driving circuit according to a fourth specific embodiment of the present application. Figure 8 As shown, the difference from the first specific embodiment is that the control module 1322 is a first current limiting resistor 13223, and the first current limiting resistor 13223 is connected in series with the low color temperature LED string group 1321. The two groups of first high color temperature LED string groups 1311 are also additionally connected in series with a third adjustment resistor 13127 arranged in parallel with the first adjustment resistor 13122, and the multi-position switch 13121 selects and connects the 5-position first adjustment resistor 13122 and the 1-position third adjustment resistor 13127 of the two groups of first high color temperature LED string groups 1311 with the first current limiting resistor 13223.

[0123] The implementation principle of the fourth specific embodiment of the present application is:

[0124] In the DTW dimming and color adjustment working mode, when the input voltage of the driving circuit 13 is low, the current flowing through the low color temperature LED string group 1321 is large, and the low color temperature LED string group 1321 can be lit; as the input voltage of the driving circuit 13 continues to increase, the existence of the first current limiting resistor 13223 makes the current flowing through the DTW branch 132 become very small, and most of the current is distributed to the two groups of first high color temperature LED string groups 1311. At this time, the low color temperature LED string group 1321 gradually changes from high brightness to slightly bright, and the color temperature it produces becomes smaller and smaller, thereby mixing with the CCT color temperature generated by the CCT branch to form a different DTW functional color temperature.

[0125] In the above four specific embodiments, the LEDs used in the two first high color temperature LED string groups 1311 emit white light in the color temperature range of 2580K-2870K and white light in the color temperature range of 4710K-5260K respectively, the LEDs used in the second high color temperature LED string group 1313 emit white light in the color temperature range of 2900K-3500K, and the LEDs used in the low color temperature LED string group 1321 emit white light in the color temperature range of 1600-2000K.

[0126] The above four specific embodiments provide solutions for realizing multi-level CCT color temperature switching and DTW color temperature switching without MCU.

[0127] Provides a method to achieve multi-level CCT color temperature switching and DTW color temperature control with MCU

[0128] Switching scheme.

[0129] FIG9 shows a schematic diagram of the circuit structure of the light-emitting device according to the embodiment of the present application to realize multi-level CCT and DTW color temperature switching under the control of MCU, and FIG10 is a schematic diagram of the MCU and its peripheral circuit according to the embodiment of the present application. As shown in FIG9 and FIG10, in the solution controlled by MCU, the driving circuit 13 includes three LED strings A, B, and C and switches G1, G2, and G3 that respectively control the on-off state of the three strings. Among the three LED strings, LED string A and LED string B have high color temperature, and there is a certain color temperature difference between LED string A and LED string B, and LED string C has low color temperature. In this way, by controlling the states of switches G1, G2, and G3 through MCU, and then controlling transistors Q3, Q4, and Q5 through switches G1, G2, and G3, the on-off states of the three LED string groups can be controlled, so that LED string group A and LED string group B are selected to be turned on for color mixing to obtain CCT color temperature, or LED string group A and / or LED string group B and LED string group C are selected to be turned on to obtain DTW functional color temperature.

[0130] The following are test results of the electrical performance parameters and functional status of the light emitting device of the embodiment of the present application for achieving CCT and DTW color temperature switching.

[0131] Table 1 shows the CCT and DTW of the light emitting device according to the fourth specific embodiment of the present application.

[0132] The electrical performance parameters of color temperature switching and the test data of the lighting state are shown in Table 1 below:

[0133] In the 5-level CCT color temperature switching working mode, an input voltage of 120V is input to the driving circuit 13, and the light generated by the two groups of first high color temperature LED strings 1311 (LED A, LED B) is mixed, and the obtained 5-level CCT color temperatures correspond to 2700K, 3000K, 3500K, 4000K, and 5000K respectively.

[0134] In the DTW color temperature switching working mode, it can be seen from Table 1 that when the input voltage Vin is low, LED D (low color temperature LED string group 1321) is on, and LED C (one of the first high color temperature LED string groups 1311) is off. As the input voltage Vin increases, LED C is on, and LED D becomes off.

[0135]

[0136] Table 1

[0137] FIG11 shows a dimming and color adjustment curve of the light-emitting device in the DTW mode according to the fourth specific embodiment of the present application. As shown in FIG11 , the ordinate of the curve is the color temperature of the second highest color temperature LED string group 1313 and the low color temperature LED string group 1321 to achieve DTW, and the abscissa is the total brightness of the two LEDs of the second highest color temperature LED string group 1313 and the low color temperature LED string group 1321. Curve ① is the DTW dimming and color adjustment curve when the second highest color temperature LED string group 1313 uses LEDs with a color temperature of 2700K in series, and the low color temperature LED string group 1321 uses LEDs with a color temperature of 1800K in series. Curve ② is the DTW dimming and color adjustment curve when the second highest color temperature LED string group 1313 uses LEDs with a color temperature of 3000K in series, and the low color temperature LED string group 1321 uses LEDs with a color temperature of 1800K in series. In Curve

[0138] In ①, when the input voltage of the driving circuit 13 is the lowest, only the low color temperature LED string group 1321 emits 1800K dark warm light. As the input voltage increases, the low color temperature LED string group 1321 and the second high color temperature LED string group 1313 mix colors and gradually turn into bright color and cold light. Finally, only the second high color temperature LED string group 1313 emits 2700K bright color and cold light. Similarly, in curve ②, the dark warm light of 1800K gradually turns into 3000 bright color and cold light.

[0139] Table 2 shows the current accuracy test data of the light emitting device in the CCT mode according to the fourth specific embodiment of the present application, as shown in Table 2 below:

[0140] The two first high color temperature LED string groups 1311 respectively select LED A with a color temperature of 5000K and LED B with a color temperature of 2700K, and the two first high color temperature LED string groups 1311 are tested for three cases where the number of LEDs in series is (12, 12), (11, 12), and (12, 11). From Table 2, in the 5-level CCT color temperature switching mode, the maximum deviation of the current is 0.6%, the color tolerance SDCM affects ±0.4 steps, and the 5-level CCT color tolerance SDCM is (4-5-5-5-4) respectively.

[0141]

[0142] Table 2

[0143] FIG12 shows a light mixing curve diagram of a light emitting device according to a fourth specific embodiment of the present application. As shown in FIG12 , the color temperature ranges of the LEDs used in the two first high color temperature LED string groups 1311 are 6500K-8000K and 2700K-3500K, respectively, and the color temperature ranges of the LEDs used in the low color temperature LED string group 1321 are 6500K-8000K and 2700K-3500K, respectively.

[0144] The color temperature range is 1500K-1700K. The two groups of first high color temperature LED string group 1311 are mixed to obtain CCT color temperature, and then mixed with low color temperature LED string group 1321 to obtain DTW functional color temperature.

[0145] It can be seen that the color coordinates of the DTW functional color temperature can be close to the blackbody radiation curve.

[0146] In summary, the light emitting device 10 integrating multi-level CCT and DTW of the present application can realize multi-level CCT color temperature switching and achieve color tolerance SDCM<3; by utilizing the principle of voltage drop difference between the CCT branch 131 and the DTW branch 132, the DTW color temperature switching working mode can be realized.

[0147] The circuit structure of this application is simple, the development cycle is short, it is suitable for DOB light sources, and the color temperature control

[0148] Accurate, can be close to the black body radiation curve for dimming and color adjustment.

[0149] According to the second aspect of the present application, a lamp is also provided. The lamp comprises one or more

[0150] A light emitting device as described above.

[0151] FIG13 shows a schematic diagram of the structure of a lamp according to a specific embodiment of the present application, and FIG14 shows a schematic diagram of the structure of a lamp according to a specific embodiment of the present application in order to highlight the first light source. As shown in FIG13 and FIG14, the lamp belongs to the type of downlight, and the lamp includes a face ring 21, an elastic mounting structure 22, a first light source 23 and a light guide 24. One end of the face ring 21 is closed, and the other end is recessed to form a first accommodating space 211. One end of the elastic mounting structure 22 is fixed to one end of the face ring 21 that is closed, and the other end is used to fix the face ring 21 to the ceiling. The elastic mounting structure 22 can be installed in the form of a corrugated tube combined with other connecting parts, or can be installed in the form of soft steel bars, which will not be further described here.

[0152] The power supply circuit 12 and the driving circuit 13 in the light emitting device 10 are integrated in the first light source 23. In this embodiment, the first light source 23 is a DOB light source. In other embodiments, other packaging forms may also be used. The first light source 23 and the voltage regulating device 14 (not shown in the figure) in the light emitting device 10

[0153] The light guide 24 is arranged at one end of the face ring 21, and the light guide 24 and the face ring 21 cover each other to close the first accommodation space 211. The first light source 23

[0154] The emitted light is scattered by the light guide 24 .

[0155] FIG15 shows a schematic diagram of the structure of a lamp according to another specific embodiment of the present application, and FIG16 shows a schematic diagram of the structure of a lamp according to another specific embodiment of the present application in order to highlight the second light source. As shown in FIG15 and FIG16, the lamp belongs to the type of ceiling lamp, and the lamp includes a lamp panel 31, a lampshade 32, a second light source 33 and a driver 34. One end of the lamp panel 31 is used to be fixed on the ceiling, and the fixing method can be suspended and fixed by other connecting parts or directly fixed on the ceiling. The other end of the lamp panel 31 and the lampshade 32 cover each other to form a second accommodating space 311. The power supply circuit 12 and the drive circuit 13 in the light-emitting device 10 are integrated in the second light source 33. In this embodiment, the second light source 33 is also

[0156] The second light source 33 is a DOB light source. In other embodiments, other packaging forms may also be used.

[0157] The second light source 33, the driver 34 and the voltage regulator 14 (not shown in the figure) in the plurality of devices 10 are installed in the second accommodation space 311. The driver 34 controls the voltage of the second light source 33.

[0158] In the use state, the light emitted by the second light source 33 is scattered by the lampshade 32 .

[0159] The present application proposes a light-emitting device and a lamp integrating multi-level CCT and DTW. The light-emitting device 10 switches between the CCT working mode and the DTW working mode through the multi-level switch 13121. When the multi-level switch 13121 selects to connect the multi-level first adjustment resistor 13122, only the CCT branch 131 is turned on, and the light-emitting device 10 enters the CCT working mode. The first adjustment resistor 13122 adjusts the input current of the branch where the first high color temperature LED string group 1311 is located. The first high color temperature LED string group 1311 generates cold colored light with different CCT color temperatures alone or by mixing colors.

[0160] When the multi-position switch 13121 selects to connect the CCT branch 131 and the control module 1322,

[0161] The optical device 10 enters the DTW working mode. When the input voltage value of the driving circuit 13 is small, since the voltage drop of the low color temperature LED string group 1321 is smaller than the voltage drop of the first high color temperature LED string group 1311 and the second high color temperature LED string group 1313, that is, the starting voltage is small, the branch where the low color temperature LED string group 1321 is located is started first, and the low color temperature LED string group 1321 is lit to produce warm light, and the first high color temperature LED string group 1311 or the second high color temperature LED string group 1313 is not started and lit; then the voltage regulating device 14 is used to continuously

[0162] The input voltage of the driving circuit 13 is increased. When the starting voltage of the first high color temperature LED string group 1311 and / or the second high color temperature LED string group 1313 is reached, the branch where the first high color temperature LED string group 1311 or the second high color temperature LED string group 1313 is located is started.

[0163] The warm LED string group 1313 is turned on to produce a cooler color light. At the same time, the control module 1322 controls the light state of the low color temperature LED string group 1321 to change from high brightness to slightly bright or not bright, that is, the main current of the driving circuit 13 is input to the low color temperature LED string group 1321 from the beginning, and then most of the current is gradually distributed to the first high color temperature LED string group 1311 or the second high color temperature LED string group 1313. In this process, the LED light state changes from warm light-mixed warm light and cool light-cool light, so that the color mixing obtains DTW.

[0164] Functional color temperature.

[0165] The light emitting device 10 of the present application, which integrates multi-level CCT and DTW, can realize multi-level CCT color temperature switching and achieve color tolerance SDCM < 3; the DTW color temperature switching working mode can be realized by utilizing the principle that there is a voltage drop difference between the CCT branch 131 and the DTW branch 132. The circuit structure of the present application is simple, the development cycle is short, it is suitable for DOB light sources, and the color temperature control is accurate, and it can be dimmed and adjusted close to the black body radiation curve.

[0166] Obviously, those skilled in the art can make various modifications and changes to the embodiments of the present application without departing from the spirit and scope of the present application. In this way, if these modifications and changes are within the scope of the claims of the present application and their equivalents, the present application is also intended to cover these modifications and changes. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are recorded in mutually different dependent claims does not indicate that the combination of these measures cannot be used to profit. Any figure mark in the claims should not be considered to limit the scope.

Claims

1. A light-emitting device integrating multi-level CCT and DTW, characterized in that: The invention comprises a driving circuit (13), wherein the driving circuit (13) comprises: A CCT branch (131), wherein the CCT branch (131) comprises: A first high color temperature LED string group (1311) configured to generate light of a corresponding CCT color temperature; A CCT color temperature switching circuit (1312), the CCT color temperature switching circuit (1312) comprising a multi-position switch (13121), the multi-position switch (13121) being configured to adjust an input current of the first high color temperature LED string group (1311), thereby adjusting the first high color temperature LED string group (1311) to generate light corresponding to different CCT color temperatures; The DTW branch (132) includes: A low color temperature LED string group (1321) is arranged in parallel with the first high color temperature LED string group (1311), configured to generate warm light, and a voltage drop of the low color temperature LED string group (1321) is smaller than a voltage drop of the first high color temperature LED string group (1311); A control module (1322) configured to realize that when the input voltage of the driving circuit (13) gradually increases, the light emitting state of the low color temperature LED string group (1321) changes from high brightness to dim brightness or no brightness; The multi-position switch (13121) also selectively connects the CCT branch (131) and the control module (1322), thereby controlling the on or off of the CCT branch (131) and the DTW branch (132).

2. The light emitting device according to claim 1, characterized in that The CCT color temperature switching circuit (1312) further comprises at least two first adjustment resistors (13122) connected in parallel to the first high color temperature LED string group (1311) branch, and the multi-position switch (13121) is configured to select different first adjustment resistors (13122) connected to the first high color temperature LED string group (1311), thereby generating light corresponding to different CCT color temperatures.

3. The light emitting device according to claim 2, characterized in that The CCT color temperature switching circuit (1312) further includes a first transistor (13123) connected in series to the first high color temperature LED string group (1311) branch, and the at least two first adjustment resistors (13122) are coupled in parallel to the first The emitter of transistor (13123).

4. The light emitting device according to claim 3, characterized in that There are at least two of the first high color temperature LED string groups (1311), and the multi-position switch (13121) is configured to select the first adjustment resistor (13122) of the same position connected to the branch where different first high color temperature LED string groups (1311) are located, so as to mix colors to obtain light corresponding to different CCT color temperatures.

5. The light emitting device according to claim 1, characterized in that The CCT branch (131) further comprises a second high color temperature LED string group (1313) which is arranged in parallel with the first high color temperature LED string group (1311) and is configured to generate light of a corresponding CCT color temperature, and the voltage drop of the low color temperature LED string group (1321) is smaller than the voltage drop of the second high color temperature LED string group (1313), and the multi-position switch (13121) selectively connects the control module (1322) and the second high color temperature LED string group (1313), thereby controlling the conduction or disconnection of the CCT branch (131) and the DTW branch (132).

6. The light emitting device according to claim 1 or 4, characterized in that: The multi-position switch (13121) selectively connects the control module (1322) and a group of the first high color temperature LED strings (1311), thereby controlling the on or off of the CCT branch (131) and the DTW branch (132).

7. The light emitting device according to claim 4, characterized in that The branches where different first high color temperature LED string groups (1311) are located are all connected in series with second regulating resistors (13126), and the other ends of different second regulating resistors (13126) are connected in common, and the multi-position switch (13121) selectively connects the control module (1322) and the ends of different second regulating resistors (13126) connected in common, thereby controlling the conduction or disconnection of the CCT branch (131) and the DTW branch (132).

8. The light emitting device according to claim 1 or 5, characterized in that: The low color temperature LED string group (1321) is designed so that the number of low color temperature LEDs connected in series therein is smaller than the number of high color temperature LEDs connected in series in the first high color temperature LED string group (1311) and / or the second high color temperature LED string group (1313), so that the voltage drop of the low color temperature LED string group (1321) is smaller than the voltage drop of the first high color temperature LED string group (1311) and / or the second high color temperature LED string group (1313).

9. The light emitting device according to claim 1, characterized in that It also includes a voltage regulating device (14) configured to regulate the input voltage of the drive circuit (13).

10. The light emitting device according to claim 1, characterized in that The control module (1322) is a constant current controller (13221).

11. The light emitting device according to claim 1, characterized in that The control module (1322) is a first current limiting resistor (13223).

12. The light emitting device according to claim 1, characterized in that The multi-position switch (13121) is a double-dip switch.

13. The light emitting device according to claim 1, characterized in that The multi-position switch (13121) is a wireless control switch, and the wireless control switch comprises: An antenna (100) is configured to cooperate with an RF circuit (200) to achieve reception and transmission of electromagnetic waves; The RF circuit (200) is configured to receive the dimming and color adjustment gear information of the current light-emitting device (10), and send a gear switching signal for the light-emitting device (10) to the electronic switch (300); The electronic switch (300) is configured to execute a dimming and color adjustment gear switching action of the light emitting device (10).

14. The light emitting device according to claim 5, characterized in that It also includes a power supply circuit (12), wherein the power supply circuit (12) includes: A rectifier bridge (121) configured to provide a rectified AC signal; A ripple elimination circuit (122), connected to the rectifier bridge (121) and the drive circuit (13), configured to receive the rectified AC signal and eliminate ripples; The control circuit (123) is connected to the driving circuit (13) to form a loop, and is configured to achieve stable current distribution to the branch where the first high color temperature LED string group (1311) or the second high color temperature LED string group (1313) and / or the low color temperature LED string group (1321) are located when the CCT branch (131) and / or the DTW branch (132) are turned on.

15. A lamp, characterized in that: Comprising a light emitting device as claimed in any one of claims 1-14.

16. The lamp according to claim 15, characterized in that The lamp comprises: A face ring (21), wherein one end of the face ring (21) is closed and the other end is recessed to form a first accommodation space (211); An elastic mounting structure (22), the elastic mounting structure (22) being fixed to one end of the face ring (21) which is closed and used for mounting the face ring (21); A first light source (23), wherein the driving circuit (13) and the power supply circuit (12) in the light-emitting device are integrated in the first light source (23), and the first light source (23) and the voltage regulating device (14) in the light-emitting device are built in the first accommodating space (211); A light guide (24), the light guide (24) being arranged at one concave end of the face ring (21) and being used to close the first accommodating space (211).

17. The lamp according to claim 15, characterized in that The lamp comprises a lamp panel (31), a lampshade (32), a second light source (33) and a driver (34); one end of the lamp panel (31) is used for fixing on a suspended ceiling, and the other end of the lamp panel and the lampshade (32) cover each other to form a second storage space (311); the driver circuit (13) and the power supply circuit (12) in the light-emitting device are integrated in the second light source (33); the second light source (33) and the driver (34) are electrically connected; the second light source (33), the driver (34) and the voltage regulating device (14) in the light-emitting device are built in the second storage space (311).

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