Two-wire direct current power supply lamp color mixing circuit

Abstract

The invention relates to the technical field of lamp color mixing circuits, in particular to a lamp color mixing circuit with two-wire direct current power supply. Through the current control circuit provided by the invention, when the polarities of the electrode A and the electrode B are changed, current can be controlled to flow into the first light emitting circuit and the second light emitting circuit so as to emit light rays with different colors; furthermore, the voltage value of the positive electrode and the negative electrode when the first light-emitting circuit emits light is limited to be larger than the voltage value of the positive electrode and the negative electrode when the second light-emitting circuit emits light through the current limiting circuit. The purpose of independent light emitting of the second light emitting circuit or mixed light emitting of the first light emitting circuit and the second light emitting circuit is achieved, three dimming curves of independent light emitting of the first light emitting circuit, independent light emitting of the second light emitting circuit and mixed light emitting are formed, and the applicability of the product is improved. The problem that only one dimming curve exists in an existing color modulation circuit of the lamp is solved.

Description

Technical Field

[0001] The invention relates to the technical field of lamp color adjustment circuits, and in particular to a lamp color adjustment circuit with two-wire direct current power supply. Background Art

[0002] Existing lamp color adjustment circuits such as Figure 1 As shown, since there are only two lines of positive and negative DC power, the DC power passes through the fuse F1 and the LED string D1-D28 back to the negative pole to form a loop. When the input voltage changes from 36V to 48V, the dimming is performed from 0% to 100%. At this time, there is only one dimming curve. The dimming curve is as follows Figure 2 As shown, if you want to achieve multiple dimming curves, you need to add input lines. For example, the two positive poles are connected to LEDs of different light colors respectively. By changing the voltage of the two positive poles, the effect of mixed colors can be achieved, but this will increase the cost of wires and power supplies and the difficulty of connection. Summary of the invention

[0003] In view of the deficiencies of the prior art, the present invention provides a two-wire DC powered lamp color adjustment circuit, which solves the problem that the existing lamp color adjustment circuit often has only one dimming curve.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A two-wire DC powered lamp color adjustment circuit includes an electrode A and an electrode B with interchangeable positive and negative poles, and a plurality of first light-emitting circuits connected to the positive and negative poles of a power supply for emitting light of one color, and a plurality of second light-emitting circuits for emitting light of another color, and further includes:

[0006] A current control circuit, wherein the current control circuit is used to introduce current into the first light-emitting circuit when the electrode A is a positive electrode and the electrode B is a negative electrode, and to introduce current into the first light-emitting circuit and the second light-emitting circuit simultaneously when the electrode A is a negative electrode and the electrode B is a positive electrode;

[0007] A current limiting module is used to connect to the first light-emitting circuit, and control the voltage value of the positive and negative poles of the first light-emitting circuit to be greater than the voltage value of the positive and negative poles of the second light-emitting circuit when the first light-emitting circuit emits light, and control the light mixing ratio of the first light-emitting circuit and the second light-emitting circuit.

[0008] Preferably, the current control circuit includes a rectifier diode D04 and a rectifier diode D02 connected in series between electrode A and electrode B, the cathodes of rectifier diode D04 and rectifier diode D02 are connected to electrode A and electrode B respectively, rectifier diode D01 and rectifier diode D03 are also connected in series between electrode A and electrode B, the anodes of rectifier diode D01 and rectifier diode D03 are connected to electrode A and electrode B respectively, the current input end of the first light-emitting circuit and the second light-emitting circuit are connected to the cathode output end between rectifier diode D01 and rectifier diode D03, the current output end of the first light-emitting circuit is connected between rectifier diode D04 and rectifier diode D02, and the current output end of the second light-emitting circuit is connected to electrode A.

[0009] Preferably, a filter capacitor C1 is connected between the electrode A and the electrode B.

[0010] Preferably, the current limiting module includes a plurality of first current limiting resistors connected in series between the cathode of the rectifier diode D04 and the electrode A, and a plurality of second current limiting resistors connected in series to the first light-emitting circuit.

[0011] Preferably, the first current limiting resistor is a variable resistor.

[0012] Preferably, a plurality of constant current diodes are connected in series and in parallel to the second light-emitting circuit.

[0013] Preferably, the calculation formula for the light mixing ratio of the first light-emitting circuit and the second light-emitting circuit is:

[0014]

[0015] in,

[0016]

[0017] In the above formula, W represents the light mixing ratio of the first light-emitting circuit and the second light-emitting circuit, V max Represents the maximum voltage between electrode A and electrode B, V LED It represents the unidirectional conduction voltage of a single LED in the first light-emitting circuit, N LED Indicates the number of LEDs on each first lighting circuit, R j represents the sum of the resistance values ​​of several second current-limiting resistors connected in series on the jth first light-emitting circuit. There are n first light-emitting circuits in total. R i represents the i-th first current limiting resistor connected in series between the cathode of the rectifier diode D04 and the electrode A. The first current limiting resistor is a resistor R i1 To resistor R i2 , Indicates the kth second current limiting resistor connected in series on the jth first light-emitting circuit, and the second current limiting resistor is a slave resistor. To resistor

[0018] Compared with the prior art, the present invention provides a two-wire DC power supply lamp color adjustment circuit, which has the following beneficial effects:

[0019] 1. By setting up a current control circuit, when changing the polarity of electrode A and electrode B, the current can be controlled to flow into the first light-emitting circuit and the second light-emitting circuit, so that the circuit can be controlled to emit light of different colors, and further through the action of the current limiting circuit, the voltage value of the positive and negative poles of the first light-emitting circuit is limited to be greater than the voltage value of the positive and negative poles of the second light-emitting circuit when the first light-emitting circuit emits light, so that when electrode A is connected to the negative pole, by controlling the voltage value between electrode A and electrode B, the purpose of the second light-emitting circuit emitting light alone or the first light-emitting circuit and the second light-emitting circuit emitting light in combination can be achieved, thereby forming three dimming curves to expand the applicability of this product.

[0020] 2. By setting a constant current diode, when the voltage value between electrode A and electrode B reaches a certain value, the maximum current passing through the second light-emitting circuit can be limited, so that the brightness of the light emitted by the second light-emitting circuit no longer changes. As the voltage between electrode A and electrode B increases, the current in the first light-emitting circuit increases linearly, and the mixing ratio of color 1 and color 2 can be more conveniently controlled according to needs.

[0021] 3. The rectifier diodes can be used to limit the conduction voltages of the first light-emitting circuit and the second light-emitting circuit respectively, so that when electrode A is connected to the negative electrode, there is almost no current in the first light-emitting circuit at the initial stage of the second light-emitting circuit, so as to ensure the purity of the light emitted by the first light-emitting circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 A color adjustment circuit for a lamp in the prior art;

[0024] Figure 2 It is a dimming curve of the prior art;

[0025] Figure 3 The lamp color adjustment circuit of the present invention;

[0026] Figure 4 It is the dimming curve of the present invention.

[0027] In the figure: 1. first light-emitting circuit; 2. second light-emitting circuit; 3. current control circuit; 4. current limiting module. DETAILED DESCRIPTION

[0028] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0029] In order to solve the problem that the existing lamp color adjustment circuit often has only one dimming curve, the present invention provides a lamp color adjustment circuit with two-wire DC power supply, so that one lamp color adjustment circuit can realize multiple dimming curves, such as Figure 3 and Figure 4 As shown, it includes electrodes A and B with interchangeable positive and negative poles, and a plurality of first light-emitting circuits 1 connected to the positive and negative poles of a power source for emitting light of one color, and a plurality of second light-emitting circuits 2 for emitting light of another color. The first light-emitting circuit 1 and the second light-emitting circuit 2 are both formed by a plurality of light-emitting diodes to form a loop, such as Figure 3 As shown in the figure, there are 2 first light-emitting circuits 1 and 3 second light-emitting circuits 2, wherein one first light-emitting circuit 1 is composed of light-emitting diodes D49, D50, D51, D52, D53, D54, D55, D56, D57, D58, D59, D60, D61 and D62, another first light-emitting circuit 1 is composed of light-emitting diodes D63, D64, D65, D66, D67, D68, D69, D70, D71, D72, D73, D74, D75 and D76, one second light-emitting circuit 2 is composed of light-emitting diodes D1-D16, another is composed of light-emitting diodes D17-D32, and the last is composed of light-emitting diodes D33-D48. The color adjustment circuit of the lamp is also It includes: a current control circuit 3 and a current limiting module 4. The current control circuit 3 is used to introduce current into the first light-emitting circuit 1 when the electrode A is the positive electrode and the electrode B is the negative electrode. At this time, the first light-emitting circuit 1 emits light of color 1. When the electrode A is the negative electrode and the electrode B is the positive electrode, the current is introduced into the first light-emitting circuit 1 and the second light-emitting circuit 2 at the same time. At this time, the first light-emitting circuit 1 and the second light-emitting circuit 2 respectively emit light of color 1 and light of color 2, so the current limiting module 4 is required for further control; the current limiting module 4 is used to connect to the first light-emitting circuit 1, and control the voltage value of the positive and negative electrodes of the first light-emitting circuit 1 to be greater than the voltage value of the positive and negative electrodes when the second light-emitting circuit 2 emits light, and control the light mixing ratio of the first light-emitting circuit 1 and the second light-emitting circuit 2, such as Figure 4As shown, taking the first light-emitting circuit 1 emitting white light and the second light-emitting circuit 2 emitting red light as an example, when the voltage between electrode A and electrode B gradually increases, color 2 is emitted first, that is, the constant current diode red light illumination curve, and as the current increases, color 1 begins to light up, that is, the mixed light / white illumination curve, and is mixed with color 2 to emit a mixed color, and the mixed color dimming curve is the constant current diode red mixed white illumination, and the mixed light / white illumination curve at this time is the white light illumination curve when mixed light needs to be emitted, so that the mixing ratio of color 1 and color 2 can be achieved by changing the resistance value of the circuit in the current limiting module 4, so as to achieve the purpose of emitting different mixed light, thereby realizing three dimming curves through one dimming circuit.

[0030] To further describe the control circuit of the current control circuit 3, the current control circuit 3 includes a rectifier diode D04 and a rectifier diode D02 connected in series between electrode A and electrode B, the cathodes of the rectifier diode D04 and the rectifier diode D02 are connected to electrode A and electrode B respectively, a rectifier diode D01 and a rectifier diode D03 are also connected in series between electrode A and electrode B, the anodes of the rectifier diode D01 and the rectifier diode D03 are connected to electrode A and electrode B respectively, the current input end of the first light-emitting circuit 1 and the second light-emitting circuit 2 are connected to the cathode output end between the rectifier diode D01 and the rectifier diode D03, the current output end of the first light-emitting circuit 1 is connected between the rectifier diode D04 and the rectifier diode D02, and the current output end of the second light-emitting circuit 2 is connected to electrode A, so that the light emission of the first light-emitting circuit 1 and the second light-emitting circuit 2 can be controlled by changing the positive and negative poles of electrode A and electrode B.

[0031] In order to achieve filtering between electrode A and electrode B and ensure the stability of the voltage between electrode A and electrode B, a filter capacitor C1 is also connected between electrode A and electrode B to filter interference.

[0032] The current limiting module 4 is used to control the resistance of the first light-emitting circuit 1, thereby controlling the current passing through the first light-emitting circuit 1, thereby controlling the light-emitting brightness of the first light-emitting circuit 1, so as to adjust the brightness ratio when the color 1 and the color 2 are mixed. The current limiting module 4 includes a plurality of first current limiting resistors connected in series between the cathode of the rectifier diode D04 and the electrode A, such as Figure 3 The resistors R13 and R14 in the embodiment, and a plurality of second current limiting resistors connected in series on the first light-emitting circuit 1, such as Figure 3 The number of resistors R1 to R12, the first current limiting resistor and the second current limiting resistor is determined according to their own resistance values ​​to ensure stable operation of the LED.

[0033] In order to enable the user to adjust the brightness of the mixture of color 1 and color 2 according to his / her needs, the first current-limiting resistor is a variable resistor, so that the mixed color can be further changed.

[0034] In order to facilitate the mixing of color 1 and color 2 and keep the brightness of color 2 unchanged, so that the mixed color can be adjusted more conveniently by adjusting the first current limiting resistor, a plurality of constant current diodes are connected in series on the second light-emitting circuit 2 in parallel, and the maximum current passing through the second light-emitting circuit 2 is limited by the constant current diodes. As a result, as the voltage between the two ends of electrode A and electrode B increases, when it reaches a certain value, such as 36V, the current passing through the second light-emitting circuit 2 no longer changes, and as the voltage continues to increase, the light mixing ratio of color 1 and color 2 can be controlled according to demand. For the adjustment of the mixing ratio of color 1 and color 2, it can be quickly adjusted according to the following calculation formula for the light mixing ratio of the first light-emitting circuit 1 and the second light-emitting circuit 2, which is:

[0035]

[0036] in,

[0037]

[0038] In the above formula, W represents the light mixing ratio of the first light emitting circuit 1 and the second light emitting circuit 2, V max Represents the maximum voltage between electrode A and electrode B, V LED It represents the unidirectional conduction voltage of a single LED on the first light-emitting circuit 1, N LED represents the number of LEDs on each first light-emitting circuit 1, such as Figure 3 As shown, there are 2 lines, R j represents the sum of the resistance values ​​of several second current-limiting resistors connected in series on the jth first light-emitting circuit 1. There are n first light-emitting circuits 1 in total. R i represents the i-th first current limiting resistor connected in series between the cathode of the rectifier diode D04 and the electrode A. The first current limiting resistor is a resistor R i1 To resistor R i2 ,like Figure 3 The resistors R13 and R14 in Indicates the kth second current limiting resistor connected in series on the jth first light-emitting circuit, and the second current limiting resistor is a slave resistor. To resistor like Figure 3 The resistors R1 to R6 in the circuit.

[0039] Below Figure 3 and Figure 4The parameters in are further explained: when electrode A is positive and electrode B is negative, the current passes through the rectifier diode D01 to the resistor R1 to the resistor R12, and then flows through the light-emitting diodes D49 to D76 to emit light of color 1, and then passes through the rectifier diode D02 and the fuse F1 to return to the electrode B point to form a loop. The input voltage is adjusted from 36V to 48V to obtain the first dimming curve, that is, the dimming curve of color 1. At this time, no current flows through the second light-emitting circuit 2, so no light of color 2 is emitted;

[0040] When electrode B is positive and electrode A is negative, the current flows through fuse F1, rectifier diode D03, constant current diodes D05, D06 and D07, and then returns to electrode A through the second light-emitting circuit 2 composed of light-emitting diodes D1 to D48 to form a loop. The input voltage is adjusted from 29-36V to obtain dimming curve 2 of color 2. Due to the use of constant current diodes, when the voltage reaches 36V, the current in the second light-emitting circuit 2 will not change and remain at a certain level. As the voltage continues to increase, it gradually rises from 36 to 48V, and the other The current flows from electrode B through fuse F1, rectifier diode D03, and resistors R1 to R12 to limit the current, then flows through the first light-emitting circuit 1 composed of D49 to D76, flows through rectifier diode D04, and is limited again by resistors R13 and R14, and finally returns to electrode A to form a loop. Because color 2 is still maintaining a certain level of luminescence at this time, the curve in the 36V-48V stage is: a small amount of color 1 is mixed with color 2, so dimming curve 3 is obtained, and the brightness ratio of color 1 can be controlled by two adjustable resistors R13 and R14.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A two-wire DC power supply lamp color adjustment circuit, comprising an electrode A and an electrode B with interchangeable positive and negative poles, and a plurality of first light-emitting circuits (1) connected to the positive and negative poles of a power supply for emitting light of one color, and a plurality of second light-emitting circuits (2) for emitting light of another color, characterized in that: Also includes: A current control circuit (3), the current control circuit (3) being used to introduce current into the first light-emitting circuit (1) when the electrode A is a positive electrode and the electrode B is a negative electrode, and to introduce current into both the first light-emitting circuit (1) and the second light-emitting circuit (2) when the electrode A is a negative electrode and the electrode B is a positive electrode; A current limiting module (4) is used to connect to the first light-emitting circuit (1), and control the voltage value of the positive and negative electrodes of the first light-emitting circuit (1) to be greater than the voltage value of the positive and negative electrodes of the second light-emitting circuit (2) when the first light-emitting circuit (1) emits light, and control the light mixing ratio of the first light-emitting circuit (1) and the second light-emitting circuit (2).

2. The lamp color adjustment circuit according to claim 1, characterized in that: The current control circuit (3) comprises a rectifier diode D04 and a rectifier diode D02 connected in series between electrode A and electrode B, wherein the cathodes of the rectifier diode D04 and the rectifier diode D02 are connected to electrode A and electrode B respectively, and a rectifier diode D01 and a rectifier diode D03 are also connected in series between electrode A and electrode B, wherein the anodes of the rectifier diode D01 and the rectifier diode D03 are connected to electrode A and electrode B respectively, the current input ends of the first light-emitting circuit (1) and the second light-emitting circuit (2) are connected to the cathode output end between the rectifier diode D01 and the rectifier diode D03, the current output end of the first light-emitting circuit (1) is connected between the rectifier diode D04 and the rectifier diode D02, and the current output end of the second light-emitting circuit (2) is connected to electrode A.

3. The lamp color adjustment circuit according to claim 2, characterized in that: A filter capacitor C1 is also connected between the electrode A and the electrode B.

4. The lamp color adjustment circuit according to claim 2, characterized in that: The current limiting module (4) comprises a plurality of first current limiting resistors connected in series between the cathode of the rectifier diode D04 and the electrode A, and a plurality of second current limiting resistors connected in series to the first light-emitting circuit (1).

5. The lamp color adjustment circuit according to claim 4, characterized in that: The first current limiting resistor is a variable resistor.

6. The lamp color adjustment circuit according to claim 1, characterized in that: The second light-emitting circuit (2) is connected in series with a plurality of constant-current diodes arranged in parallel.

7. The lamp color adjustment circuit according to claim 4, characterized in that: The calculation formula for the light mixing ratio of the first light-emitting circuit (1) and the second light-emitting circuit (2) is: in, In the above formula, W represents the light mixing ratio of the first light-emitting circuit and the second light-emitting circuit, V max Represents the maximum voltage between electrode A and electrode B, V LED It represents the unidirectional conduction voltage of a single LED in the first light-emitting circuit, N LED Indicates the number of LEDs on each first lighting circuit, R j represents the sum of the resistance values ​​of several second current-limiting resistors connected in series on the jth first light-emitting circuit. There are n first light-emitting circuits in total. R i represents the i-th first current limiting resistor connected in series between the cathode of the rectifier diode D04 and the electrode A. The first current limiting resistor is a resistor R i1 To resistor R i2 , Indicates the kth second current limiting resistor connected in series on the jth first light-emitting circuit, and the second current limiting resistor is a slave resistor. To resistor

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