Lighting circuit and lighting device

Abstract

The utility model discloses a lighting circuit and lighting equipment. The lighting circuit comprises N lighting branches, a dial control branch and a constant current branch. When N is larger than 1, the color temperatures of different lighting branches in the N lighting branches are different, each lighting branch comprises at least one LED lamp, and when the at least one LED lamp comprises a plurality of LED lamps, the LED lamps are sequentially connected in series. The constant current branch provides a constant current. The dial control branch receives a dial signal and establishes connection between M lighting branches in the N lighting branches and the constant current branch based on the dial signal, so that the constant current flows through the M lighting branches, and when the constant current flows through the M lighting branches, the M lighting branches are lightened to provide corresponding color temperatures. Through the mode, the cost can be reduced while the light source with the adjustable color temperature is provided, so that the light source is suitable for low-cost application scenes.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of electronic circuits, and in particular to a lighting circuit and a lighting device. Background Art

[0002] The color temperature adjustment function of lighting equipment allows users to adjust the color temperature of the light source according to personal preferences or specific needs. Color temperature refers to the color characteristics of the light emitted by a light source, usually expressed in Kelvin (K). Lower color temperatures (approximately 2700K to 3000K) give a warm feeling and are suitable for creating a comfortable atmosphere, while higher color temperatures (approximately 5000K to 6500K) give a fresh and bright feeling and are suitable for work environments that require high concentration.

[0003] Currently, color temperature adjustment in lighting equipment typically requires a controller combined with a switching transistor. Specifically, the controller outputs a PWM signal to control the on-time of the switching transistor, thereby adjusting the on-time ratio of LED lights with different color temperatures. However, this method is not suitable for low-cost applications. Utility Model Content

[0004] The embodiments of the present application provide a lighting circuit and a lighting device, which can reduce costs while providing a light source with adjustable color temperature, so as to be suitable for low-cost application scenarios.

[0005] In a first aspect, an embodiment of the present application provides a lighting circuit, comprising:

[0006] N lighting branches, where N is an integer greater than or equal to 1, and when N is greater than 1, the color temperatures of the N lighting branches are different;

[0007] A dial control branch and a constant current branch, wherein the dial control branch is connected between the lighting branch and the constant current branch;

[0008] The constant current branch is configured to provide a constant current;

[0009] The dial control branch is configured to receive a dial signal and establish a connection between M lighting branches among the N lighting branches and the constant current branch based on the dial signal, so that the constant current flows through the M lighting branches, wherein when the constant current flows through the M lighting branches, the M lighting branches are illuminated to provide a corresponding color temperature, where M is an integer greater than or equal to 1 and less than or equal to N.

[0010] In one or more embodiments, the lighting circuit further comprises:

[0011] a signal processing branch connected between the AC power supply and the lighting branch, the signal processing branch being configured to rectify and filter the AC power supply to output a DC power supply to the lighting branch;

[0012] At least one fill light branch is connected between the signal processing branch and the constant current branch, and the fill light branch is configured to output light of a preset color to configure the color of the light output by the lighting circuit.

[0013] In one or more embodiments, the signal processing branch includes a rectifier bridge and a first capacitor;

[0014] The first end of the rectifier bridge is connected to the live wire of the AC power supply, the second end of the rectifier bridge is connected to the neutral wire of the AC power supply, the fourth end of the rectifier bridge is respectively connected to the first end of the first capacitor and the lighting branch, and the third end of the rectifier bridge and the second end of the first capacitor are both grounded.

[0015] In one or more embodiments, the signal processing branch further includes a first resistor;

[0016] The first resistor is connected in parallel with the first capacitor.

[0017] In one or more embodiments, the N lighting branches include a first lighting branch and a second lighting branch, and the DIP control branch includes a DIP switch module, a second resistor, and a third resistor;

[0018] The first end of the first lighting branch is connected to the first end of the second lighting branch, the second end of the first lighting branch is respectively connected to the first end of the second resistor, the eighth pin, the first pin and the third pin of the dip switch module, the second end of the second resistor is respectively connected to the first end of the third resistor, the seventh pin of the dip switch module, the second pin of the dip switch module and the constant current branch, and the second end of the third resistor is respectively connected to the second end of the second lighting branch and the fifth pin, the sixth pin and the fourth pin of the dip switch module.

[0019] In one or more embodiments, the constant current branch includes a second capacitor and at least one constant current unit, and the constant current unit includes a constant current drive control chip and a sampling resistor;

[0020] The first end of the second capacitor is respectively connected to the positive pin of the constant current drive control chip and the dial control branch, the second end of the second capacitor and the negative pin of the constant current drive control chip are both grounded, and the current sampling pin of the constant current drive control chip is grounded through the sampling resistor.

[0021] In one or more embodiments, the fill light branch includes a fourth resistor and a lamp bead;

[0022] The first end of the fourth resistor is connected to the signal processing branch, the second end of the fourth resistor is connected to the anode of the lamp bead, and the cathode of the lamp bead is connected to the constant current branch;

[0023] The lamp bead is one of an R lamp bead, a G lamp bead and a B lamp bead, and when at least one fill light branch includes multiple fill light branches, the types of lamp beads in different fill light branches are different.

[0024] In one or more embodiments, the lighting circuit further comprises a fuse;

[0025] The first end of the fuse is connected to the live wire of the AC power supply, and the second end of the fuse is connected to the signal processing branch.

[0026] In one or more embodiments, the lighting circuit further comprises a varistor;

[0027] The varistor is connected between the second end of the fuse and the neutral line of the AC power supply.

[0028] In a second aspect, an embodiment of the present application provides a lighting device, comprising the lighting circuit as described above.

[0029] The beneficial effects of the present application are as follows: the lighting circuit of the embodiment of the present application includes N lighting branches, a dial control branch and a constant current branch. The constant current branch provides a constant current. The dial control branch receives a dial signal and establishes a connection between M lighting branches in the N lighting branches and the constant current branch based on the dial signal, so that a constant current flows through the M lighting branches, wherein when the constant current flows through the M lighting branches, the M lighting branches are illuminated to provide a corresponding color temperature. Since the color temperatures of different lighting branches in the N lighting branches are different when N is greater than 1, by adjusting the dial signal, the size of M and / or the illuminated lighting branch can be changed, thereby achieving the purpose of adjusting the overall color temperature of the M lighting branches, thereby providing a light source with adjustable color temperature. Moreover, compared with the related art, there is no need to use a controller and a switch tube, thereby reducing costs and being suitable for low-cost application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] One or more embodiments are exemplarily described by the figures in the accompanying drawings, which are not intended to limit the embodiments. Elements with the same reference numerals in the drawings represent similar elements.

[0031] Figure 1 This is a schematic diagram of the composition block diagram of the lighting circuit provided in the embodiment of the present application Figure 1 ;

[0032] Figure 2 This is a schematic diagram of the composition block diagram of the lighting circuit provided in the embodiment of the present application Figure 2 ;

[0033] Figure 3 is with Figure 2 The circuit structure diagram corresponding to the composition block diagram shown;

[0034] Figure 4 Schematic diagram of the internal structure of the DIP switch module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0036] It should be noted that, when an element is referred to as being “connected to” another element, it may be directly connected to the other element, or one or more intervening elements may exist therebetween.

[0037] In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as there is no structural conflict between them.

[0038] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a block diagram of a lighting circuit according to an embodiment of the present application. Figure 1 As shown, the lighting circuit 100 includes a signal processing branch 10 , N lighting branches, a dial control branch 20 and a constant current branch 30 .

[0039] The N lighting branches include a first lighting branch a1, a second lighting branch a2, ..., and a Kth lighting branch aN, where N is an integer greater than or equal to 1. When N is greater than 1, different lighting branches in the N lighting branches have different color temperatures. That is, the color temperatures of any two lighting branches among the first lighting branch a1, the second lighting branch a2, ..., and the Nth lighting branch aN are different, for example, the color temperatures of the first lighting branch a1 and the second lighting branch a2 are different. The lighting branch includes at least one LED lamp. If the at least one LED lamp includes multiple LED lamps, the LED lamps are connected in series. That is, the first lighting branch a1 includes LED lamps a1_b1, a1_b2, ..., and a1_bL, which are sequentially connected in series; the second lighting branch a2 includes LED lamps a2_b1, a2_b2, ..., and a2_bL, which are sequentially connected in series; ...; and the Nth lighting branch aN includes LED lamps aN_b1, aN_b2, ..., and aN_bL, which are sequentially connected in series, where L is an integer greater than or equal to 1. Furthermore, in this embodiment, the number of LED lamps in each lighting branch is the same. In other embodiments, different lighting branches may also have different numbers of LED lamps, and this embodiment of the present application does not impose any specific limitation on this.

[0040] The signal processing branch 10 is connected between the AC power supply 200 and the lighting branch. Specifically, the first end of the signal processing branch 10 is connected to the live wire of the AC power supply 200. The first end of the first lighting branch a1, the first end of the second lighting branch a2, ..., and the first end of the Nth lighting branch aN are then connected to the second end of the signal processing branch 10. The dial control branch 20 is connected between the lighting branch and the constant current branch 30. Specifically, the first end of the dial control branch 20 is connected to the first end of the constant current branch 30. The N ports of the dial control branch 20, excluding the first end, are respectively connected to the second end of the first lighting branch a1, the second end of the second lighting branch a2, ..., and the second end of the Nth lighting branch aN. In some embodiments, the AC power supply 200 is a mains electricity source.

[0041] Specifically, the signal processing branch 10 is configured to rectify and filter the AC power 200 to output DC power to the lighting branches (including the first lighting branch a1, the second lighting branch a2, ..., the Nth lighting branch aN). The constant current branch 30 is configured to provide a constant current. The dial control branch 20 is configured to receive a dial signal and, based on the dial signal, establish a connection between M of the N lighting branches and the constant current branch 30, so that a constant current flows through the M lighting branches. When the constant current flows through the M lighting branches, the M lighting branches are illuminated to provide a corresponding color temperature, where M is an integer greater than or equal to 1 and less than or equal to N.

[0042] Taking N=3 as an example, the color temperatures of any two of the first, second, and third lighting branches a1, a2, and a3 are different, assuming they are 3000K (Kelvin), 4000K, and 5000K, respectively. By adjusting the dial signal, the value of M can be changed to adjust the color temperature. For example, when M is set to 1, the color temperature of the lighting circuit 100 is determined by one lighting branch; when M is set to 2, the color temperature of the lighting circuit 100 is determined by the combination of the color temperatures of the two lighting branches. Furthermore, while keeping M constant, the color temperature can also be changed by changing the illuminated lighting branch. For example, when M is 2, the combined color temperature of the first and second lighting branches a1 and a2 (i.e., the color temperature of the lighting circuit 100) is different from the combined color temperature of the first and third lighting branches a1 and a3 (i.e., the color temperature of the lighting circuit 100). Of course, M and the illuminated lighting branches may also be changed simultaneously to adjust the color temperature of the lighting circuit 100 .

[0043] In summary, since different lighting branches have different color temperatures, adjusting the DIP signal can change the size of M and / or the illuminated lighting branch, thereby adjusting the overall color temperature of the M lighting branches (that is, the color temperature of the lighting circuit 100), thereby providing a light source with adjustable color temperature. Furthermore, compared to related technologies, this solution eliminates the need for a controller and switching transistor, thus reducing costs and making it suitable for low-cost applications.

[0044] Furthermore, the color temperature adjustment solutions used in related technologies typically lack a memory function. This means that every time the light is turned on again after a long interval, the color temperature is always restored to its initial state, failing to maintain the desired color temperature. However, in the embodiments of this application, by simply configuring the dial signal and not changing it, the previously set color temperature is maintained even when the light is turned off and on again, meeting user needs.

[0045] In one embodiment, if Figure 2 As shown, the lighting circuit further includes at least one fill light branch. The at least one fill light branch includes a first fill light branch c1, a second fill light branch c2, ..., and a Jth fill light branch cJ, where J is an integer greater than or equal to 1.

[0046] Among them, the fill light branch is connected between the signal processing branch 10 and the constant current branch 30, that is, the first end of the first fill light branch c1, the first end of the second fill light branch c2, ..., the first end of the J-th fill light branch cJ are connected and then connected to the second end of the signal processing branch 10, and the second end of the first fill light branch c1, the second end of the second fill light branch c2, ..., the second end of the J-th fill light branch cJ are connected and then connected to the second end of the constant current branch 30.

[0047] Specifically, the fill light branch is configured to output light of a preset color to configure the color of the light output by the lighting circuit 100. That is, the first fill light branch c1, the second fill light branch c2, ..., and the Jth fill light branch cJ are used to adjust the color of the light output by the lighting circuit 100.

[0048] Please refer to Figure 3 , Figure 3 The embodiments of this application provide Figure 2 A circuit structure corresponding to the block diagram shown in FIG. Figure 3 In the example, N=2 and J=1 are taken.

[0049] like Figure 3 As shown, the signal processing branch 10 includes a rectifier bridge U1 and a first capacitor C1.

[0050] Among them, the first end of the rectifier bridge U1 is connected to the live wire of the AC power supply 200, the second end of the rectifier bridge U1 is connected to the neutral wire of the AC power supply 200, the fourth end of the rectifier bridge U1 is respectively connected to the first end of the first capacitor C1 and the lighting branch (including the first end of the first lighting branch a1 and the first end of the second lighting branch a2), and the third end of the rectifier bridge U1 and the second end of the first capacitor C1 are both grounded GND.

[0051] Specifically, the rectifier bridge U1 is used for rectification, and the first capacitor C1 is used for filtering.

[0052] In this embodiment, the signal processing branch 10 further includes a first resistor R1 .

[0053] The first resistor R1 is connected in parallel with the first capacitor C1, and is used to provide an energy dissipation circuit for the first capacitor C1.

[0054] In this embodiment, the at least one lighting branch includes a first lighting branch a1 and a second lighting branch a2 , and the DIP control branch 20 includes a DIP switch module U2 , a second resistor R2 , and a third resistor R3 .

[0055] Among them, the first end of the first lighting branch a1 is respectively connected to the first end of the second lighting branch a2 and the signal processing branch 10, the second end of the first lighting branch a1 is respectively connected to the first end of the second resistor R2, the eighth pin, the first pin and the third pin of the dip switch module U2, the second end of the second resistor R2 is respectively connected to the first end of the third resistor R3, the seventh pin of the dip switch module U2, the second pin of the dip switch module U2 and the constant current branch 30, and the second end of the third resistor R3 is respectively connected to the second end of the second lighting branch a2 and the fifth pin, the sixth pin and the fourth pin of the dip switch module U2.

[0056] Please refer to Figure 4 , Figure 4The internal structure of the DIP switch module U2 is shown as an example. Numbers 1-8 represent the first to eighth pins of the DIP switch module U2, respectively. The DIP switch module U2 includes a first DIP unit U21 and a second DIP unit U22. The first DIP unit U21 and the second DIP unit U22 are movable units. By moving the first DIP unit U21 and the second DIP unit U22, a connection between corresponding pins can be established. For example, by moving the first DIP unit U21, the first pin and the second pin can be short-circuited. Thus, a connection can be established between the corresponding lighting branch and the constant current branch 30, so that the corresponding lighting branch is illuminated by the constant current flowing therethrough to provide a corresponding color temperature. For example, a connection can be established between the first lighting branch a1 and the constant current branch 30, so that the first lighting branch a1 is illuminated by the constant current flowing therethrough to provide a corresponding color temperature.

[0057] Please refer back to Figure 3 The constant current branch 30 includes a second capacitor C2 and at least one constant current unit. The constant current unit includes a constant current drive control chip U3 and a sampling resistor RA. The at least one constant current unit includes a first constant current unit d1, a second constant current unit d2, ..., and an Hth constant current unit dH, where H is an integer greater than or equal to 1.

[0058] Among them, the first end of the second capacitor C2 is respectively connected to the positive pin of the constant current drive control chip U3 and the dial control branch 20, the second end of the second capacitor C2 and the negative pin of the constant current drive control chip U3 are both grounded GND, and the current sampling pin of the constant current drive control chip U3 is grounded GND through the sampling resistor RA.

[0059] Specifically, the second capacitor C2 is used for filtering. The sampling resistor RA is used to determine the current output by the constant current drive control chip U3. By connecting the first constant current unit d1, the second constant current unit d2, ..., and the Hth constant current unit dH in parallel, the current output by the first constant current unit d1, the current output by the second constant current unit d2, ..., and the current output by the Hth constant current unit dH can be added together. Thus, by adjusting the value of H according to the required constant current, it can meet different application scenarios, which is highly practical.

[0060] In this embodiment, the first fill light branch c1 includes a fourth resistor R4 and a lamp bead LD1. It is understood that other fill light branches (such as the second fill light branch c2) can be configured with reference to the first fill light branch c1.

[0061] The first end of the fourth resistor R4 is connected to the signal processing branch 10 , the second end of the fourth resistor R4 is connected to the anode of the lamp bead LD1 , and the cathode of the lamp bead LD1 is connected to the constant current branch 30 .

[0062] The lamp beads are selected from R, G, and B lamp beads, where R, G, and B represent red, green, and blue LED lamp beads, respectively. Furthermore, when at least one fill light branch includes multiple fill light branches, the types of lamp beads in different fill light branches are different. For example, when the lighting circuit 100 includes two fill light branches (respectively, a first fill light branch c1 and a second fill light branch c2), the type of lamp beads in the first fill light branch c1 is different from the type of lamp beads in the second fill light branch c2. For example, in some specific embodiments, the lamp beads in the first fill light branch c1 are R lamp beads, and the lamp beads in the second fill light branch c2 are G lamp beads.

[0063] Specifically, the lamp bead LD1 is configured to be in a constant-on state. In different application scenarios, the type of the lamp bead LD1 only needs to be set in advance according to the user's needs to obtain the required color of the lighting circuit 100.

[0064] In this embodiment, the lighting circuit 100 further includes a fuse F1.

[0065] The first end of the fuse F1 is connected to the live wire of the AC power source 200, and the second end of the fuse F1 is connected to the signal processing branch 10. When the current in the lighting circuit 100 exceeds the rated value of the fuse F1, the fuse F1 will heat up and eventually melt, thereby cutting off the current flow and preventing other components in the lighting circuit 100 from being damaged or causing dangerous situations such as fire.

[0066] In this embodiment, the lighting circuit 100 further includes a varistor RV1 .

[0067] The varistor RV1 is connected between the second terminal of the fuse F1 and the neutral line of the AC power source 200. When an overvoltage occurs in the lighting circuit 100, the varistor RV1 can clamp the voltage to a relatively fixed value, thereby protecting other sensitive components in the lighting circuit 100 from damage.

[0068] The embodiments of the present application also provide a lighting device, which includes the lighting circuit 100 in any embodiment of the present application.

[0069] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

[0070] The above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them. Based on the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, and the steps may be implemented in any order. A person skilled in the art should understand that the technical solutions described in the above embodiments may be modified, or some of the technical features may be replaced by equivalents. However, such modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A lighting circuit, characterized in that: include: N lighting branches, where N is an integer greater than or equal to 1, and when N is greater than 1, the color temperatures of the N lighting branches are different; A dial control branch and a constant current branch, wherein the dial control branch is connected between the lighting branch and the constant current branch; The constant current branch is configured to provide a constant current; The dial control branch is configured to receive a dial signal and establish a connection between M lighting branches among the N lighting branches and the constant current branch based on the dial signal, so that the constant current flows through the M lighting branches, wherein when the constant current flows through the M lighting branches, the M lighting branches are illuminated to provide a corresponding color temperature, where M is an integer greater than or equal to 1 and less than or equal to N.

2. The lighting circuit according to claim 1, characterized in that The lighting circuit further includes: a signal processing branch connected between the AC power supply and the lighting branch, the signal processing branch being configured to rectify and filter the AC power supply to output a DC power supply to the lighting branch; At least one fill light branch is connected between the signal processing branch and the constant current branch, and the fill light branch is configured to output light of a preset color to configure the color of the light output by the lighting circuit.

3. The lighting circuit according to claim 2, characterized in that: The signal processing branch includes a rectifier bridge and a first capacitor; The first end of the rectifier bridge is connected to the live wire of the AC power supply, the second end of the rectifier bridge is connected to the neutral wire of the AC power supply, the fourth end of the rectifier bridge is respectively connected to the first end of the first capacitor and the lighting branch, and the third end of the rectifier bridge and the second end of the first capacitor are both grounded.

4. The lighting circuit according to claim 3, characterized in that: The signal processing branch further includes a first resistor; The first resistor is connected in parallel with the first capacitor.

5. The lighting circuit according to claim 1 or 2, characterized in that: The N lighting branches include a first lighting branch and a second lighting branch, and the DIP control branch includes a DIP switch module, a second resistor and a third resistor; The first end of the first lighting branch is connected to the first end of the second lighting branch, the second end of the first lighting branch is respectively connected to the first end of the second resistor, the eighth pin, the first pin and the third pin of the dip switch module, the second end of the second resistor is respectively connected to the first end of the third resistor, the seventh pin of the dip switch module, the second pin of the dip switch module and the constant current branch, and the second end of the third resistor is respectively connected to the second end of the second lighting branch and the fifth pin, the sixth pin and the fourth pin of the dip switch module.

6. The lighting circuit according to claim 1 or 2, characterized in that: The constant current branch includes a second capacitor and at least one constant current unit, and the constant current unit includes a constant current drive control chip and a sampling resistor; The first end of the second capacitor is respectively connected to the positive pin of the constant current drive control chip and the dial control branch, the second end of the second capacitor and the negative pin of the constant current drive control chip are both grounded, and the current sampling pin of the constant current drive control chip is grounded through the sampling resistor.

7. The lighting circuit according to claim 2, characterized in that: The fill light branch includes a fourth resistor and a lamp bead; The first end of the fourth resistor is connected to the signal processing branch, the second end of the fourth resistor is connected to the anode of the lamp bead, and the cathode of the lamp bead is connected to the constant current branch; The lamp bead is one of an R lamp bead, a G lamp bead and a B lamp bead, and when at least one fill light branch includes multiple fill light branches, the types of lamp beads in different fill light branches are different.

8. The lighting circuit according to claim 2, characterized in that: The lighting circuit further includes a fuse; The first end of the fuse is connected to the live wire of the AC power supply, and the second end of the fuse is connected to the signal processing branch.

9. The lighting circuit according to claim 8, characterized in that: The lighting circuit further includes a varistor; The varistor is connected between the second end of the fuse and the neutral line of the AC power supply.

10. A lighting device, characterized in that: The lighting circuit comprises the lighting circuit according to any one of claims 1 to 9.

Images