Lighting circuit and lighting device

Abstract

The utility model discloses a lighting circuit and lighting equipment, the lighting circuit comprises N constant current modules and light-emitting modules, any light-emitting module comprises at least two light-emitting units, the at least two light-emitting units are connected in parallel, one end of a target constant current module is connected with a power supply and one end of a target light-emitting unit, and the other end of the target constant current module is connected with the power supply. The other end of the target light-emitting unit is connected with the grounding end; the target constant current module is any one constant current module in the N constant current modules, and the target light-emitting unit is a light-emitting unit in the light-emitting module corresponding to the target constant current module; and the target light emitting unit is used for generating stable working current to generate light based on the target constant current module. Therefore, under the condition that part or all of the light-emitting units in the light-emitting module work, the working current provided by the constant-current module is shunted, so that the difference between the intensity of light emitted by a single light-emitting unit in the light-emitting module and the intensity of light emitted by part or all of the light-emitting units in the light-emitting module is effectively reduced.

Description

Technical Field

[0001] This application relates to the technical field of lighting devices, and more specifically, to a lighting circuit and a lighting device. Background Art

[0002] The lighting circuit includes multiple light-emitting units for emitting light. The light-emitting units can be composed of multiple LED lights. The multiple light-emitting units are respectively in independent circuits. When all circuits are in the conducting state, the light brightness presented by the lighting circuit is significantly stronger than the light brightness when the multiple light-emitting units work independently. Therefore, when switching from only one light-emitting unit working in the multiple light-emitting units to multiple light-emitting units working simultaneously, the light brightness presented by the lighting circuit becomes stronger, affecting the user experience. Summary of the Utility Model

[0003] In view of the above problems, this application proposes a lighting circuit and a lighting device, which can effectively reduce the change in the light brightness intensity of the lighting device to improve the user experience.

[0004] In a first aspect, an embodiment of this application provides a lighting circuit, which includes: N constant current modules and N light-emitting modules corresponding to the N constant current modules one by one. Any one of the N light-emitting modules includes at least two light-emitting units, and the at least two light-emitting units are in parallel. N is a positive integer greater than or equal to 1. Wherein: one end of the target constant current module is connected to the power supply, the other end of the target constant current module is connected to one end of the target light-emitting unit, and the other end of the target light-emitting unit is connected to the ground terminal; the target constant current module is any one of the N constant current modules, and the target light-emitting unit is a light-emitting unit in the light-emitting module corresponding to the target constant current module; the target constant current module is used to generate a stable working current; the target light-emitting unit is used to generate light based on the working current.

[0005] In a second aspect, an embodiment of this application further provides a lighting device, which includes the above lighting circuit.

[0006] The technical solution provided by this application, the lighting circuit includes: N constant current modules and N light emitting modules corresponding to the N constant current modules one by one. Any one of the N light emitting modules includes at least two light emitting units, and at least two light emitting units are connected in parallel. N is a positive integer greater than or equal to 1. Among them: one end of the target constant current module is connected to the power supply, the other end of the target constant current module is connected to one end of the target light emitting unit, and the other end of the target light emitting unit is connected to the ground terminal; the target constant current module is any one of the N constant current modules, and the target light emitting unit is the light emitting unit in the light emitting module corresponding to the target constant current module; the target constant current module is used to generate a stable working current; the target light emitting unit is used to generate light based on the working current. Thus, through multiple constant current modules, it is ensured that each light emitting module can obtain a relatively stable working current. And because the connection relationship of the light emitting units in the light emitting module is in parallel, when some or all of the light emitting units in the light emitting module work, they will shunt the working current, thereby effectively reducing the difference between the intensity of the light emitted by a single light emitting unit in the light emitting module and the intensity of the light emitted by some or all of the light emitting units in the light emitting module, thereby reducing the uneven brightness intensity of the lighting circuit and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, rather than all embodiments. Based on the embodiments of the present application, all other embodiments and drawings obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0008] Figure 1 FIG. shows a schematic structural diagram of a lighting circuit involved in an embodiment of the present application.

[0009] Figure 2 FIG. shows a schematic structural diagram of another lighting circuit involved in an embodiment of the present application.

[0010] Figure 3 FIG. shows a schematic structural diagram of yet another lighting circuit involved in an embodiment of the present application.

[0011] Figure 4 FIG. shows a schematic structural diagram of still another lighting circuit involved in an embodiment of the present application.

[0012] Figure 5 FIG. shows a schematic structural diagram of yet another lighting circuit involved in an embodiment of the present application.

[0013] Figure 6 FIG. shows a schematic structural diagram of a lighting device provided by an embodiment of the present application. Detailed implementation manners

[0014] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application.

[0015] The lighting circuit includes a plurality of light-emitting units for emitting light. The light-emitting units can be composed of a plurality of LED lights. The plurality of light-emitting units are respectively in independent circuits. When all the circuits are in the conducting state, the light brightness presented by the lighting circuit is significantly stronger than the light brightness when the plurality of light-emitting units work alone. Therefore, when switching from only one light-emitting unit working among the plurality of light-emitting units to the plurality of light-emitting units working simultaneously, the light brightness presented by the lighting circuit becomes stronger, affecting the user experience.

[0016] Exemplarily, please refer to Figure 1 , Figure 1 which shows a schematic structural diagram of a lighting circuit involved in the embodiments of this application. As Figure 1 shown, the lighting circuit includes a plurality of light-emitting units, and each light-emitting unit among the plurality of light-emitting units can be composed of a plurality of LED lights. Since the connection relationship between the plurality of light-emitting units is in parallel. Therefore, when all the light-emitting units are conducting, the light brightness emitted by the lighting circuit is stronger than the light brightness emitted when one or some of the plurality of light-emitting units are conducting, resulting in an uneven brightness intensity of the lighting circuit, thus affecting the user experience.

[0017] To improve the above problems, this application provides a lighting circuit and a lighting device. The lighting circuit includes: N constant current modules and N light-emitting modules corresponding to the N constant current modules one by one. Any one of the N light-emitting modules includes at least two light-emitting units, and at least two light-emitting units are in parallel. N is a positive integer greater than or equal to 1. Wherein: one end of the target constant current module is connected to the power supply, the other end of the target constant current module is connected to one end of the target light-emitting unit, and the other end of the target light-emitting unit is connected to the ground terminal; the target constant current module is any one of the N constant current modules, and the target light-emitting unit is a light-emitting unit in the light-emitting module corresponding to the target constant current module; the target constant current module is used to generate a stable working current; the target light-emitting unit is used to generate light based on the working current.

[0018] Thus, through multiple constant current modules, it is ensured that each light-emitting module can obtain a relatively stable working current. Moreover, since the connection relationship of the light-emitting units in the light-emitting module is parallel, when some or all of the light-emitting units in the light-emitting module are working, they will shunt the working current, thereby effectively reducing the difference between the intensity of the light emitted by a single light-emitting unit in the light-emitting module and the intensity of the light emitted by some or all of the light-emitting units in the light-emitting module, thus reducing the unevenness of the brightness intensity of the lighting circuit and improving the user experience.

[0019] Please refer to Figure 2 , Figure 2 which shows a schematic structural diagram of another lighting circuit involved in the embodiments of the present application. As Figure 2 shown, the lighting circuit 100 includes N constant current modules 110 and N light-emitting modules 120 corresponding to the N constant current modules 110 one by one. Any one of the N light-emitting modules 120 includes at least two light-emitting units 121, and the at least two light-emitting units 121 are in parallel. N is a positive integer greater than or equal to 1. Among them:

[0020] One end of the target constant current module is connected to the power supply VCC, the other end of the target constant current module is connected to one end of the target light-emitting unit, and the other end of the target light-emitting unit is connected to the ground terminal; the target constant current module is any one of the N constant current modules 110, and the target light-emitting unit is the light-emitting unit 121 in the light-emitting module 120 corresponding to the target constant current module.

[0021] The target constant current module is used to generate a stable working current; the target light-emitting unit is used to generate light based on the working current.

[0022] In some embodiments, some of the light-emitting units 121 in the light-emitting module 120 corresponding to the target constant current module are connected to the ground terminal W, and some other light-emitting units 121 in the light-emitting module 120 corresponding to the target constant current module are connected to the ground terminal C.

[0023] In a specific embodiment, the light-emitting module 120 corresponding to the target constant current module includes two light-emitting units 121 (the first light-emitting unit and the second light-emitting unit respectively). One end of the first light-emitting unit is connected to the ground terminal W, and one end of the second light-emitting unit is connected to the ground terminal C.

[0024] Any one of the N constant current modules 110 provides a stable working current for its corresponding light-emitting module 120 to ensure the stability of the operation of all the light-emitting modules 120, so as to avoid the corresponding fluctuation of the working current corresponding to the light-emitting module 120 when there is a fluctuation in the initial current input by the power supply VCC, and thus avoid the unstable operation of the light-emitting module 120. For example, it is possible that some of the light-emitting modules 120 flicker.

[0025] The N constant current modules 110 can also ensure that each light emitting module 120 obtains an equal working current, so as to avoid the situation that when multiple light emitting modules 120 work simultaneously, the intensity of the light emitted by the multiple light emitting modules 120 is uneven because some of the light emitting modules 120 obtain a smaller working current.

[0026] By adding the constant current modules 110, not only can the working stability of the light emitting modules 120 be improved and the intensity uniformity of the light emitted by the multiple light emitting modules 120 be improved, but also the intensity uniformity of the light emitted by the light emitting units 121 in a single light emitting module 120 can be effectively improved. Specifically:

[0027] The different light emitting units 121 included in the light emitting module 120 corresponding to the target constant current module are in series with the target constant current module. And these different light emitting units 121 are in parallel with each other, so that the brightness of the light emitted when these different light emitting units 121 are all in the conducting state is close to the brightness of the light emitted when only one of these different light emitting units 121 is in the conducting state.

[0028] More specifically, when only one of the different light emitting units 121 included in the light emitting module 120 corresponding to the target constant current module is in the conducting state, the working current generated by the target constant current module only flows to the ground terminal through the loop where the currently conducting light emitting unit 121 is located. And when some or all of the light emitting units 121 included in the light emitting module 120 corresponding to the target constant current module are in the conducting state, the working current generated by the target constant current module will flow to the ground terminal through multiple loops corresponding to the conducting light emitting units 121. Thus, the situation that the difference in the brightness of the light emitted when one of the different light emitting units 121 included in the light emitting module 120 corresponding to the target constant current module is in the conducting state and the brightness of the light emitted when some or all of the different light emitting units 121 included in the light emitting module 120 corresponding to the target constant current module are in the working state is relatively large can be avoided.

[0029] Exemplarily, the lighting circuit 100 includes a constant current module 110, a corresponding light emitting module 120 for the constant current module 110. The light emitting module 120 includes two light emitting units 121. The operating current generated by the constant current module 110 is a preset value. When one of the two light emitting units 121 is in the on state and the other of the two light emitting units 121 is in the off state, the loop where the power supply, the constant current module 110, the on-state light emitting unit 121 and the ground terminal are located is conducting, and the current of this loop is the preset value. When both of the two light emitting units 121 are in the on state, the loop where the power supply, the constant current module 110, one on-state light emitting unit 121 and the ground terminal are located is conducting, and the loop where the power supply, the constant current module 110, the other on-state light emitting unit 121 and the ground terminal are located is conducting, and the sum of the currents between the two light emitting units 121 is the preset value. So that the brightness difference between the light emitted when only one of the two light emitting units 121 is on and the light emitted when both of the two light emitting units 121 are on is small.

[0030] Further, in some embodiments, please refer to Figure 3 , Figure 3 which shows a schematic structural diagram of another lighting circuit involved in the embodiments of the present application. As Figure 3 shown, the target constant current module may include a constant current diode D. The positive electrode of the constant current diode D is connected to the power supply VCC, and the negative electrode of the constant current diode D is connected to the target light emitting unit.

[0031] The constant current diode D provides a stable operating current for the light emitting module 120 connected to the constant current diode D to ensure that the brightness is consistent when all light emitting modules 120 are working, so as to avoid the corresponding fluctuation of the operating current corresponding to the light emitting module 120 in the case of fluctuations in the initial current input by the power supply VCC, resulting in the unstable operation of the light emitting module 120.

[0032] And the constant current diode D can also ensure that the current flows from the power supply to the ground terminal. To avoid the situation that in the case of a sudden interruption of the current in the lighting circuit 100, a very high reverse voltage may be generated in the lighting circuit 100, resulting in damage to the power supply VCC. To play a protective role for the lighting circuit 100 through the constant current diode D.

[0033] And multiple constant current diodes D can also ensure that each light emitting module 120 obtains an equal operating current, so as to avoid the situation that when multiple light emitting modules 120 work simultaneously, due to the smaller operating current obtained by some light emitting modules 120, the intensity of the light emitted by multiple light emitting modules 120 is uneven.

[0034] In some other embodiments, the target constant current module may include a PNP transistor and a first resistor. The base of the PNP transistor is connected to the power supply VCC through the first resistor. The emitter of the PNP transistor is connected to the light emitting module 120, and the collector of the PNP transistor is connected to the emitter of the PNP transistor. By selecting an appropriate resistance value of the first resistor, the current value flowing into the light emitting module 120 is controlled to provide a stable operating current for the light emitting module 120.

[0035] In some other embodiments, the target constant current module may include an operational amplifier or a current mirror, etc. Each light emitting module 120 obtains a stable operating current through the operational amplifier or the current mirror.

[0036] So far, the constant current module 110 provides a stable operating current for its corresponding light emitting module 120 to ensure that each light emitting module 120 is in a relatively stable operating state during operation, and different light emitting modules 120 can obtain working currents that are relatively close to reduce the brightness difference between different light emitting modules 120. The light emitting units 121 connected in parallel in a single light emitting module 120 further shunt the operating current to reduce the brightness of the lamp tube generated when different light emitting units 121 in a single light emitting module 120 work simultaneously or partially. Specifically:

[0037] Please continue to refer to Figure 3 , in some embodiments, the target light emitting unit includes at least one lamp bead, and the lamp beads in the at least one lamp bead are connected in series in sequence. Optionally, the number of lamp beads included in different light emitting units 121 in the target light emitting unit is the same. Optionally, the number of lamp beads included in different light emitting units 121 in the target light emitting unit is different.

[0038] When the number of lamp beads included in different light emitting units 121 is the same, the current obtained by each loop where the light emitting unit 121 is located is equal, which can make the light brightness presented by each light emitting unit 121 relatively the same, so that the light brightness of the lighting circuit 100 is relatively balanced.

[0039] When the number of lamp beads included in different light emitting units 121 in the target light emitting unit is the same, the lamp bead positions of different light emitting units 121 in the target light emitting unit are correspondingly arranged. By correspondingly arranging the lamp beads included in different light emitting units 121 in the target light emitting unit, the lamp beads arranged correspondingly can jointly present the light of the required color.

[0040] For example, please refer to Figure 4 , Figure 4 shows a schematic structural diagram of still another lighting circuit involved in the embodiments of the present application. As Figure 4As shown, the light-emitting module 120 corresponding to the target constant-current module includes a first light-emitting unit A and a second light-emitting unit B. The first light-emitting unit A includes a first lamp bead a1 and a second lamp bead a2, and the second light-emitting unit B includes a third lamp bead b1 and a fourth lamp bead b2. In order to make the light-emitting module 120 emit a first kind of light (the first kind of light is composed of a combination of two kinds of lights with a first color temperature and a second color temperature), the first lamp bead a1 and the second lamp bead a2 can work according to the corresponding parameters of the light with the first color temperature, and the third lamp bead b1 and the fourth lamp bead b2 can work according to the corresponding parameters of the light with the second color temperature. Since the first lamp bead a1 and the third lamp bead b1 are arranged in corresponding positions, the first kind of light is presented by the combination of the first lamp bead a1 and the third lamp bead b1; since the second lamp bead a2 and the fourth lamp bead b2 are arranged in corresponding positions, the first kind of light is presented by the combination of the second lamp bead a2 and the fourth lamp bead b2, so that the entire light-emitting module 120 presents the first kind of light.

[0041] In a specific embodiment, the number of the light-emitting units 121 in the target light-emitting unit is two. One of the two light-emitting units 121 is connected to the ground terminal W, and the other of the two light-emitting units 121 is connected to the ground terminal C. The two light-emitting units 121 respectively present lights with corresponding color temperatures. For example, one of the two light-emitting units 121 presents the light with the first color temperature, and the other of the two light-emitting units 121 presents the light with the second color temperature. The final light presented by the combined action of the first color temperature and the second color temperature is presented by the two light-emitting units 121 together.

[0042] Further, in some embodiments, please refer to Figure 5 , Figure 5 shows a schematic structural diagram of another lighting circuit involved in the embodiments of the present application. As Figure 5 shown, the lighting circuit 100 further includes a control module 130. The control module 130 is connected between the power supply VCC and the target constant-current module (that is, one end of the control module 130 is connected to the power supply VCC, and the other end of the control module 130 is respectively connected to N light-emitting modules).

[0043] The control module 130 is used to determine the working parameters of the target light-emitting unit; the control module 130 is further used to control the target light-emitting unit to work according to the working parameters to present light.

[0044] In some embodiments, the control module 130 may be a controller (Central Processing Unit, CPU). In some embodiments, the control module 130 may also be an LED driving chip (for example, a driving chip of model WS2812B, a driving chip of model TLC5940, a driving chip of model TM1812, or a driving chip of model PCA9685).

[0045] After determining the light to be presented by the lighting circuit 100, the control module 130 determines whether the light to be presented is presented by a single color temperature or requires the combined action of lights of multiple color temperatures. After determining the required color temperature parameters, the control module 130 sends control information including the color temperature parameters to the corresponding light-emitting unit 121, that is, sends control information including the color temperature parameters to each lamp bead. Each lamp bead then determines the color temperature parameter corresponding to its own serial number information in the control information according to its own serial number information, and then operates according to the corresponding color temperature parameter, so that under the action of multiple lamp beads, the lighting circuit 100 presents the required light.

[0046] Different light-emitting units 121 in the same light-emitting module 120 can work simultaneously; some of the different light-emitting units 121 in the same light-emitting module 120 can work, while some other light-emitting units do not work. When the control module 130 determines that a certain light-emitting unit 121 does not work, it can send control information indicating non-operation to the light-emitting unit 121.

[0047] It should be noted that during the operation of the lamp beads, it is possible that the lamp beads are damaged due to excessive current in the light-emitting unit 121. Based on the above situation, in some embodiments, please continue to refer to Figure 3 , the target light-emitting unit includes a current-limiting resistor R, and the current-limiting resistor R is connected in series with at least one lamp bead.

[0048] It can be understood that the present application does not limit the specific setting position of the current-limiting resistor R.

[0049] Optionally, the resistance values of different light-emitting units 121 in any light-emitting module 120 are equal. The equal resistance values of different light-emitting units 121 in any light-emitting module 120 can make the current obtained by each loop where the light-emitting unit 121 is located equal, and can make the light brightness presented by each light-emitting unit 121 relatively the same, so that the light brightness of the lighting circuit 100 is relatively balanced. Optionally, the resistance values of different light-emitting units 121 in any light-emitting module 120 are not equal.

[0050] Please refer to Figure 6 , Figure 6The figure shows a schematic structural diagram of a lighting device provided by an embodiment of the present application. As Figure 6 shown, the lighting device 200 includes the above-mentioned lighting circuit 100.

[0051] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process of the above-mentioned lighting circuit 100 can refer to the corresponding process in the foregoing circuit embodiment, and will not be elaborated herein.

[0052] In some embodiments, the lighting device 200 may further include a mobile terminal. The mobile terminal is connected to the lighting circuit 100. The user can input the required light color or light parameters (for example, brightness parameters and / or color temperature parameters) through the mobile terminal. According to the light color or light parameters input by the user, the application program of the mobile terminal presents the lighting effect corresponding to the light color or light parameters input by the user. When the user determines that the lighting effect needs to be presented on the lighting circuit 100, the mobile terminal sends instruction information including the light color or light parameters input by the user to the lighting circuit 100.

[0053] The lighting circuit 100 then determines the working parameters of the target light-emitting unit according to the instruction information including the light color or light parameters input by the user, and further controls each lamp bead to present the light of the corresponding parameters.

[0054] That is to say, the application program of the mobile terminal at least includes an information input area and an effect presentation area. The user inputs the required light color or light parameters through the information input area; the mobile terminal presents the lighting effect of the lighting circuit 100 in the effect presentation area according to the required light color or light parameters.

[0055] Through the cooperation between the mobile terminal and the lighting circuit 100, the user can preview the lighting effect of the lighting circuit 100 in advance on the mobile terminal, which can effectively improve the user experience. In addition, the lighting circuit 100 can also send the fault information including the faulty light-emitting unit to the mobile terminal to present the specific position information of the faulty light-emitting unit in the effect presentation area, so that the user can accurately determine the faulty light-emitting unit in the lighting circuit 100 according to the specific position information.

[0056] Specifically, the control module in the lighting circuit sends online confirmation information to one lamp bead in each light-emitting unit 121 according to a preset working cycle. The lamp bead generates a reply signal after receiving the online confirmation information, and the lamp bead sends the interaction information including its corresponding coding information and reply information to the control module. When the control module does not receive the interaction information of a certain lamp bead within a preset time period, it is confirmed that the light-emitting unit 121 where the lamp bead is located is faulty, and then the fault information of the faulty light-emitting unit is sent to the mobile terminal.

[0057] The present application provides an illumination circuit and an illumination device. The illumination circuit includes: N constant current modules and N light emitting modules corresponding to the N constant current modules one by one. Any one of the N light emitting modules includes at least two light emitting units, and the at least two light emitting units are connected in parallel. N is a positive integer greater than or equal to 1. Wherein: one end of the target constant current module is connected to the power supply, the other end of the target constant current module is connected to one end of the target light emitting unit, and the other end of the target light emitting unit is connected to the ground terminal; the target constant current module is any one of the N constant current modules, and the target light emitting unit is a light emitting unit in the light emitting module corresponding to the target constant current module; the target constant current module is used to generate a stable working current; the target light emitting unit is used to generate light based on the working current.

[0058] Thus, by means of multiple constant current modules, it is ensured that each light emitting module can obtain a relatively stable working current. And since the connection relationship of the light emitting units in the light emitting module is in parallel, when some or all of the light emitting units in the light emitting module are working, they will shunt the working current, thereby effectively reducing the difference between the intensity of the light emitted by a single light emitting unit in the light emitting module and the intensity of the light emitted by some or all of the light emitting units in the light emitting module, thus reducing the unevenness of the brightness intensity of the illumination circuit to improve the user experience.

[0059] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An illumination circuit, characterized in that It includes N constant-current modules and N light-emitting modules corresponding to the N constant-current modules one by one. Any one of the N light-emitting modules includes at least two light-emitting units, and the at least two light-emitting units are connected in parallel. N is a positive integer greater than or equal to 1, where: One end of the target constant-current module is connected to the power supply, the other end of the target constant-current module is connected to one end of the target light-emitting unit, and the other end of the target light-emitting unit is connected to the ground terminal; the target constant-current module is any one of the N constant-current modules, and the target light-emitting unit is a light-emitting unit in the light-emitting module corresponding to the target constant-current module; The target constant-current module is used to generate a stable working current; The target light-emitting unit is used to generate light based on the working current.

2. The lighting circuit according to claim 1, wherein It further includes a control module, and the control module is connected between the power supply and the target constant-current module; The control module is used to determine the working parameters of the target light-emitting unit; The control module is further used to control the target light-emitting unit to work according to the working parameters to present the light.

3. The lighting circuit according to claim 1, characterized in that, The target constant-current module includes a constant-current diode, the positive electrode of the constant-current diode is connected to the power supply, and the negative electrode of the constant-current diode is connected to the target light-emitting unit.

4. The lighting circuit according to claim 1, characterized in that, The target light-emitting unit includes at least one lamp bead, and the lamp beads in the at least one lamp bead are connected in series in sequence.

5. The lighting circuit according to claim 4, characterized in that, The different light-emitting units in the target light-emitting unit include the same number of lamp beads.

6. The lighting circuit according to claim 5, wherein The lamp bead positions of the different light-emitting units in the target light-emitting unit are correspondingly arranged.

7. The lighting circuit according to claim 5, characterized in that, The number of the light-emitting units in the target light-emitting unit is two. One of the two light-emitting units is connected to the ground terminal W, and the other of the two light-emitting units is connected to the ground terminal C. The two light-emitting units respectively present lights of corresponding color temperatures.

8. The lighting circuit according to claim 4, wherein, The target light-emitting unit includes a current-limiting resistor, and the current-limiting resistor is connected in series with the at least one lamp bead.

9. The lighting circuit according to claim 1, wherein The resistance values of the different light-emitting units in any one of the light-emitting modules are equal.

10. A lighting device, characterized in that, It includes the lighting circuit according to any one of claims 1-9.

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