LED color modulation circuit

Abstract

The LED color adjusting circuit comprises a direct-current power source, a switch element, a first LED lamp bead string and a second LED lamp bead string, the first LED lamp bead string and the second LED lamp bead string are different in color temperature and are connected in parallel, the direct-current power source is provided with a positive electrode and a negative electrode, the positive electrode is electrically connected with the first LED lamp bead string and the second LED lamp bead string correspondingly through a first circuit and a second circuit, and the negative electrode is electrically connected with the first LED lamp bead string and the second LED lamp bead string correspondingly through a third circuit and a fourth circuit. The first circuit comprises a first branch circuit and a second branch circuit, the impedance of the first branch circuit is smaller than that of the second branch circuit, the second circuit comprises a third branch circuit and a fourth branch circuit, the impedance of the third branch circuit is smaller than that of the fourth branch circuit, and the switch element is provided with a plurality of adjusting gears. Different adjusting gears enable different branch combinations to realize conduction. Different gears are switched through the switch element, the color temperature mixing state of the two LED lamp bead strings can be simply changed, the circuit reliability is high, and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of lighting technology, and in particular to an LED color adjustment circuit. Background Art

[0002] Lighting fixtures based on luminous LEDs have been widely used in people's daily lives, and lighting fixtures with different functions are constantly being developed to meet consumers' needs such as remote control, LED color adjustment, and brightness adjustment.

[0003] Existing LED color adjustment solutions often use IC chips to control multiple LEDs for light mixing and color adjustment. However, this light mixing and color adjustment method has relatively low reliability over long-term use and high circuit costs. Utility Model Content

[0004] Based on this, it is necessary to provide an LED color adjustment circuit to address the above technical problems.

[0005] The LED color adjustment circuit of the present application includes a DC power supply, a switching element, and a first LED lamp string and a second LED lamp string with different color temperatures and connected in parallel. The DC power supply has a positive pole and a negative pole. The positive pole is electrically connected to the first LED lamp string and the second LED lamp string respectively through a first circuit and a second circuit. The first circuit includes a first branch and a second branch, wherein the impedance of the first branch is less than the impedance of the second branch. The second circuit includes a third branch and a fourth branch, wherein the impedance of the third branch is less than the impedance of the fourth branch. The switching element has multiple adjustment gears, and different adjustment gears enable different branch combinations to be turned on.

[0006] Optionally, the adjustment gear includes the following three adjustment types:

[0007] Only the first branch or the second branch is turned on;

[0008] Only the third branch or the fourth branch is turned on;

[0009] The first branch or the second branch is turned on, and the third branch or the fourth branch is turned on.

[0010] Optionally, the adjustment gear includes a first gear, a second gear, a third gear and a fourth gear:

[0011] When the switch element is switched to the first gear position, only the first branch is turned on;

[0012] When the switch element is switched to the second gear position, the first branch and the fourth branch are simultaneously turned on;

[0013] When the switch element is switched to the third gear, the second branch and the third branch are simultaneously turned on;

[0014] When the switch element is switched to the fourth gear, only the third branch is turned on.

[0015] Optionally, the switch element has an input terminal connected to the positive electrode of the DC power supply, and a first output terminal and a second output terminal;

[0016] When the switch element is switched to the first gear of the adjustment gear, the first power output end and the second power output end are connected to the first branch at the same time;

[0017] When the switch element is switched to the second gear of the adjustment gear, the first power output end is connected to the first branch, and the second power output end is connected to the fourth branch;

[0018] When the switch element is switched to the third gear of the adjustment gear, the first power output end is connected to the second branch, and the second power output end is connected to the third branch;

[0019] When the switch element is switched to the fourth gear of the adjustment gear, the first power output end and the second power output end are connected to the third branch at the same time.

[0020] Optionally, the switch element has a first power output tooth and a second power output tooth, the first power output tooth serves as the first power output end, and the second power output tooth serves as the second power output end;

[0021] The LED color adjustment circuit includes a plurality of power feed teeth for being electrically connected to the switch element and arranged equidistantly in the following order, including:

[0022] A1 power input gear, electrically connected to the first branch;

[0023] A2 power input gear, electrically connected to the first branch;

[0024] A3 power input gear, electrically connected to the third branch;

[0025] A4 power input gear, electrically connected to the third branch;

[0026] B1 power input gear, electrically connected to the first branch;

[0027] B2 power input gear, electrically connected to the fourth branch;

[0028] B3 power input gear, electrically connected to the second branch;

[0029] B4 power input gear, electrically connected to the third branch;

[0030] The spans of the first power output tooth and the second power output tooth are equal to the spans of the A1 power input tooth and the B1 power input tooth.

[0031] Optionally, the second branch includes a first diode and a first resistor connected in series.

[0032] Optionally, the fourth branch includes a second diode and a second resistor connected in series.

[0033] Optionally, a fifth branch that blocks current flow is provided between the switch element and the second LED lamp string, and the impedance of the fifth branch is different from that of the fourth branch;

[0034] The switch element includes a fifth gear position. When the switch element is switched to the fifth gear position, the first branch and the fifth branch are simultaneously turned on.

[0035] Optionally, the switch element has an input terminal connected to the positive electrode of the DC power supply, and a first output terminal and a second output terminal;

[0036] When the switch element is switched to the fifth gear, the first power output end is connected to the fifth branch, and the second power output end is connected to the first branch.

[0037] Optionally, the switch element has a first power output tooth and a second power output tooth, the first power output tooth serves as the first power output end, and the second power output tooth serves as the second power output end;

[0038] The LED color adjustment circuit includes a plurality of power feed teeth for being electrically connected to the switch element and arranged equidistantly in the following order, including:

[0039] A1 power input gear, electrically connected to the first branch;

[0040] A2 power input gear, electrically connected to the first branch;

[0041] A5 power input gear, electrically connected to the fifth branch;

[0042] A3 power input gear, electrically connected to the third branch;

[0043] A4 power input gear, electrically connected to the third branch;

[0044] B1 power input gear, electrically connected to the first branch;

[0045] B2 power input gear, electrically connected to the fourth branch;

[0046] B5 power input gear, electrically connected to the first branch;

[0047] B3 power input gear, electrically connected to the second branch;

[0048] B4 power input gear, electrically connected to the third branch;

[0049] The spans of the first power output tooth and the second power output tooth are equal to the spans of the A1 power input tooth and the B1 power input tooth.

[0050] Optionally, the fifth branch includes a third resistor.

[0051] Optionally, the color temperature of the first LED lamp bead string is warm, and the color temperature of the second LED lamp bead string is cool.

[0052] The LED color adjustment circuit of this application has at least the following technical effects:

[0053] This application can easily change the color temperature mixing state of two LED lamp strings by switching the switch element to different gears. The switching circuit of the switch element is highly reliable. The LED color adjustment circuit provided by this application does not use complex integrated circuits, reducing circuit production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 This is a schematic diagram of the module structure of the LED color adjustment circuit in one embodiment of the present application;

[0055] Figure 2 for Figure 1 Schematic diagram of the structure of the DC power supply;

[0056] Figure 3 This is a schematic diagram of the module structure of the LED color adjustment circuit in one embodiment of the present application;

[0057] Figure 4 This is a circuit schematic diagram of an LED color adjustment circuit in one embodiment of the present application;

[0058] The reference numerals in the figures are described as follows:

[0059] 100, DC power supply; 200, switching element; 201, first power output terminal; 202, second power output terminal; 203, power input terminal; 211, first power output tooth; 212, second power output tooth; 311, first branch; 312, second branch; 321, third branch; 322, fourth branch; 323, fifth branch; 410, first LED lamp bead string; 420, second LED lamp bead string. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0061] It should be noted that when a component is referred to as being "connected" to another component, it may be directly connected to the other component or there may be an intermediate component. When a component is referred to as being "disposed on" another component, it may be directly disposed on the other component or there may be an intermediate component.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0063] In this application, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly indicate the number or order of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0064] In this application, the terms "comprises" and "comprising" and any variations thereof are intended to cover non-exclusive inclusions, for example, a system, product or apparatus comprising a list of elements is not necessarily limited to those elements expressly listed but may include other elements not expressly listed or inherent to such products or apparatuses.

[0065] In this application, the terms "corresponding," "corresponding," "matching," and "adapting," such as "B corresponding to A," "B corresponding to A," "A corresponds to B," or "B corresponds to A," indicate that B corresponds to A in shape, position, or function, and that B can be determined based on A. Determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information.

[0066] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood broadly. For example, they can mean fixed connection, detachable connection, or integration; they can mean mechanical connection, electrical connection, or mutual communication; they can mean direct connection or indirect connection through an intermediate medium, and they can enable internal communication between two elements or interaction between two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0067] See also Figure 1 and Figure 2 One embodiment of the present application provides an LED color adjustment circuit, comprising a DC power supply 100, a switching element 200, and a first LED string 410 and a second LED string 420 having different color temperatures and connected in parallel. The DC power supply 100 has a positive electrode V+ and a negative electrode V-. The positive electrode V+ supplies power to both the first and second LED strings 410 and 420 via the switching element 200. The first LED string 410 has a warm color temperature, and its positive electrode is designated as LED W+. The second LED string 420 has a cool color temperature, and its positive electrode is designated as LED C+.

[0068] A first branch 311 and a second branch 312 are provided between the switch element 200 and the first LED lamp string 410. The impedance of the second branch 312 is greater than that of the first branch 311. The first and second branches 311 and 312 together form a first circuit. A third branch 321 and a fourth branch 322 are provided between the switch element 200 and the second LED lamp string 420. The impedance of the fourth branch 322 is greater than that of the third branch 321. The third and fourth branches 321 and 322 together form a second circuit. The positive electrode of the DC power supply is electrically connected to the first and second LED lamp strings respectively through the first and second circuits.

[0069] Different adjustment gears enable different branch combinations to be turned on. The adjustment gears can be divided into three adjustment types: (1) only the first branch or the second branch is turned on; (3) only the third branch or the fourth branch is turned on; (3) the first branch or the second branch is turned on, and the third branch or the fourth branch is turned on.

[0070] Furthermore, the switch element 200 has multiple adjustment positions, including a first position, a second position, a third position, and a fourth position. When the switch element 200 is switched to the first position, only the first branch 311 is conductive. When switched to the second position, both the first branch 311 and the fourth branch 322 are conductive. When switched to the third position, both the second branch 312 and the third branch 321 are conductive. When switched to the fourth position, only the third branch 321 is conductive.

[0071] In this embodiment, the cathodes of the first LED lamp string 410 and the second LED lamp string 420 can be directly electrically connected to the cathode V- of the DC power supply 100. The DC power supply 100 can be as follows: Figure 2 The switching power supply shown. The DC power supply 100 can be any circuit component that can provide a DC current. The first branch 311 has a greater blocking effect on current or voltage than the first branch 311, so turning on the first branch 311 can increase the brightness of the first LED lamp string 410 compared to turning on the second branch 312. The third branch 321 and the fourth branch 322 are the same. In this embodiment, the color temperature mixing state of the two LED lamp strings can be easily changed by adjusting the switch element 200 to different adjustment gears. The adjustment of the switch element 200 is a simple circuit adjustment with high circuit reliability; and the LED color adjustment circuit does not use complex integrated circuits, which reduces production costs.

[0072] Furthermore, this embodiment provides an implementation method in which only the first branch 311 is conductive in the first gear position, and only the third branch 321 is conductive in the fourth gear position. The switching element 200 has an input terminal 203 connected to the positive electrode V+ of the DC power supply 100, as well as a first output terminal 201 and a second output terminal 202. When the switching element 200 is switched to the first gear position, the first output terminal 201 and the second output terminal 202 are simultaneously connected to the first branch 311. When the switching element 200 is switched to the second gear position, the first output terminal 201 is connected to the first branch 311, and the second output terminal 202 is connected to the fourth branch 322. When the switching element 200 is switched to the third gear position, the first output terminal 201 is connected to the second branch 312, and the second output terminal 202 is connected to the third branch 321. When the switching element 200 is switched to the fourth gear position, the first output terminal 201 and the second output terminal 202 are simultaneously connected to the third branch 321.

[0073] See also Figures 3 and 4 Furthermore, a fifth branch 323 that blocks current flow is provided between the switch element 200 and the second LED lamp string 420. The fifth branch 323 has a different impedance than the fourth branch 322. The fifth branch 323 includes a third resistor, which includes resistors R7, R9, R9, and R10 connected in parallel. Based on this, the switch element 200 includes a fifth position, and when the switch element 200 is switched to the fifth position, the first branch 311 and the fifth branch 323 are simultaneously conductive. Accordingly, when the switch element 200 is switched to the fifth position, the first output terminal 201 is connected to the fifth branch 323, and the second output terminal 202 is connected to the first branch.

[0074] The second branch 312 includes a first diode D1 and a first resistor connected in series. The first resistor is formed, for example, by resistors R1, R2, and R3 connected in parallel. The fourth branch 322 includes a second diode D2 and a second resistor connected in series. The second resistor is formed, for example, by resistors R4, R5, and R6 connected in parallel. In other embodiments, the second branch 312 and the fourth branch 322 each consist solely of multiple diodes connected in series.

[0075] See also Figure 4 In one embodiment, the switch element 200 has a first power output tooth 211 and a second power output tooth 212. The first power output tooth 211 serves as the first power output terminal 201, and the second power output tooth 212 serves as the second power output terminal 202. The LED color adjustment circuit includes a plurality of power input teeth electrically connected to the switch element 200 and arranged equidistantly in the following order, including:

[0076] A1 is an electric input gear, electrically connected to the first branch.

[0077] A2 is an electric input gear, electrically connected to the first branch.

[0078] A5 is an electrical input gear, electrically connected to the fifth branch.

[0079] A3 is an electric input gear, electrically connected to the third branch.

[0080] A4 is the power input gear, electrically connected to the third branch.

[0081] B1 is an electric input gear, electrically connected to the first branch.

[0082] B2 is the power input gear, electrically connected to the fourth branch.

[0083] B5 is an electric input gear, electrically connected to the first branch.

[0084] B3 is an electric input gear, electrically connected to the second branch.

[0085] B4 is the power input gear, electrically connected to the third branch.

[0086] The span of the first output tooth 211 and the second output tooth 212 is equal to the span of the input teeth A1 and B1. After the switch element 200 moves, it electrically connects the two input teeth in the corresponding position. During use, the first output tooth 211 and the second output tooth 212 are moved synchronously to respectively connect the input teeth A1 and B1 (i.e., the first gear); the input teeth A2 and B2 (i.e., the second gear); the input teeth A5 and B5 (i.e., the fifth gear); the input teeth A3 and B3 (i.e., the third gear); and the input teeth A4 and B4 (i.e., the fourth gear).

[0087] In some embodiments, the A5 power-input tooth and the B5 power-input tooth are omitted, that is, the fifth gear is omitted. After the A3 power-input tooth and the B3 power-input tooth are omitted, the remaining power-input teeth are arranged in sequence.

[0088] The technical features of the above-described embodiments may be combined in any manner. To simplify the description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as no contradiction exists between these combinations of technical features, they should be considered to be within the scope of this specification. When technical features of different embodiments are embodied in the same drawing, it can be deemed that the drawing also discloses examples of combinations of the various embodiments involved.

[0089] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the spirit of the present application, and such modifications and improvements are all within the scope of protection of the present application.

Claims

1. LED color adjustment circuit, characterized in that, The invention comprises a DC power supply, a switching element, and a first LED lamp string and a second LED lamp string having different color temperatures and connected in parallel. The DC power supply has a positive electrode and a negative electrode. The positive electrode is electrically connected to the first LED lamp string and the second LED lamp string respectively through a first circuit and a second circuit. The first circuit comprises a first branch and a second branch, wherein the impedance of the first branch is smaller than the impedance of the second branch. The second circuit comprises a third branch and a fourth branch, wherein the impedance of the third branch is smaller than the impedance of the fourth branch. The switching element has multiple adjustment gears, and different adjustment gears enable different branch combinations to be turned on.

2. The LED color adjustment circuit according to claim 1, wherein: The adjustment gear includes the following three adjustment types: Only the first branch or the second branch is turned on; Only the third branch or the fourth branch is turned on; The first branch or the second branch is turned on, and the third branch or the fourth branch is turned on.

3. The LED color adjustment circuit according to claim 1, wherein: The adjustment gears include the first gear, the second gear, the third gear and the fourth gear: When the switch element is switched to the first gear position, only the first branch is turned on; When the switch element is switched to the second gear position, the first branch and the fourth branch are simultaneously turned on; When the switch element is switched to the third gear, the second branch and the third branch are simultaneously turned on; When the switch element is switched to the fourth gear, only the third branch is turned on.

4. The LED color adjustment circuit according to claim 1, wherein: The switch element has an input terminal connected to the positive electrode of the DC power supply, and a first output terminal and a second output terminal; When the switch element is switched to the first gear of the adjustment gear, the first power output end and the second power output end are connected to the first branch at the same time; When the switch element is switched to the second gear of the adjustment gear, the first power output end is connected to the first branch, and the second power output end is connected to the fourth branch; When the switch element is switched to the third gear of the adjustment gear, the first power output end is connected to the second branch, and the second power output end is connected to the third branch; When the switch element is switched to the fourth gear of the adjustment gear, the first power output end and the second power output end are connected to the third branch at the same time.

5. The LED color adjustment circuit according to claim 4, wherein: The switch element has a first power output tooth and a second power output tooth, the first power output tooth serves as the first power output end, and the second power output tooth serves as the second power output end; The LED color adjustment circuit includes a plurality of power feed teeth for being electrically connected to the switch element and arranged equidistantly in the following order, including: A1 power input gear, electrically connected to the first branch; A2 power input gear, electrically connected to the first branch; A3 power input gear, electrically connected to the third branch; A4 power input gear, electrically connected to the third branch; B1 power input gear, electrically connected to the first branch; B2 power input gear, electrically connected to the fourth branch; B3 power input gear, electrically connected to the second branch; B4 power input gear, electrically connected to the third branch; The spans of the first power output tooth and the second power output tooth are equal to the spans of the A1 power input tooth and the B1 power input tooth.

6. The LED color adjustment circuit according to claim 1, wherein: The second branch includes a first diode and a first resistor connected in series.

7. The LED color adjustment circuit according to claim 1, wherein: The fourth branch includes a second diode and a second resistor connected in series.

8. The LED color adjustment circuit according to claim 1, wherein: A fifth branch is provided between the switch element and the second LED lamp string to block the passage of current, and the impedance of the fifth branch is different from that of the fourth branch; The switch element includes a fifth gear position. When the switch element is switched to the fifth gear position, the first branch and the fifth branch are simultaneously turned on.

9. The LED color adjustment circuit according to claim 8, wherein: The switch element has an input terminal connected to the positive electrode of the DC power supply, and a first output terminal and a second output terminal; When the switch element is switched to the fifth gear, the first power output end is connected to the fifth branch, and the second power output end is connected to the first branch.

10. The LED color adjustment circuit according to claim 9, wherein: The switch element has a first power output tooth and a second power output tooth, the first power output tooth serves as the first power output end, and the second power output tooth serves as the second power output end; The LED color adjustment circuit includes a plurality of power feed teeth for being electrically connected to the switch element and arranged equidistantly in the following order, including: A1 power input gear, electrically connected to the first branch; A2 power input gear, electrically connected to the first branch; A5 power input gear, electrically connected to the fifth branch; A3 power input gear, electrically connected to the third branch; A4 power input gear, electrically connected to the third branch; B1 power input gear, electrically connected to the first branch; B2 power input gear, electrically connected to the fourth branch; B5 power input gear, electrically connected to the first branch; B3 power input gear, electrically connected to the second branch; B4 power input gear, electrically connected to the third branch; The spans of the first power output tooth and the second power output tooth are equal to the spans of the A1 power input tooth and the B1 power input tooth.

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