Two-wire direct current power supply lamp color mixing circuit

Abstract

The utility model 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 utility model, 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] This utility model relates to the field of lighting color-tuning circuit technology, specifically a lighting color-tuning circuit powered by two-wire DC power supply. Background Technology

[0002] Existing lighting color-changing circuits, such as Figure 1 As shown, since there are only two lines, positive and negative, for DC power, the DC power flows through fuse F1, through LEDs D1-D28, and back to the negative terminal to form a circuit. When the input voltage changes from 36V to 48V, dimming is performed from 0% to 100%. At this time, there is only one dimming curve, as shown in the diagram. Figure 2 As shown, if you want to achieve multiple dimming curves, you need to add input lines. For example, connect two positive terminals to LEDs of different colors. By changing the voltage of the two positive terminals, you can achieve the effect of mixing colors. However, this will increase the cost of wires and power supplies and make the connection more difficult. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a two-wire DC power supply circuit for lamp color adjustment, which solves the problem that existing lamp color adjustment circuits often only have one dimming curve.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A two-wire DC-powered lamp color-tuning circuit includes electrodes A and B with interchangeable positive and negative terminals, several first light-emitting circuits connected to the power supply for emitting light of one color, and several second light-emitting circuits for emitting light of another color, further comprising:

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

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

[0008] As preferred, the current control circuit comprises rectifier diode D04 and rectifier diode D02 connected in series between electrode A and electrode B, the negative poles 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 positive poles of rectifier diode D01 and rectifier diode D03 are connected to electrode A and electrode B respectively, the current input ends of the first light emitting circuit and the second light emitting circuit are connected to the negative pole 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] As preferred, a filter capacitor C1 is also connected between electrode A and electrode B.

[0010] As preferred, the current limiting module comprises a plurality of first current limiting resistors connected in series between the negative pole of rectifier diode D04 and electrode A, and a plurality of second current limiting resistors connected in series on the first light emitting circuit.

[0011] As preferred, the first current limiting resistors are variable resistors.

[0012] As preferred, a plurality of constant current diodes are connected in parallel on the second light emitting circuit.

[0013] As preferred, the calculation formula of the light mixing ratio of the first light emitting circuit and the second light emitting circuit is:

[0014]

[0015] wherein,

[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 represents the unidirectional conduction voltage of a single LED on the first light emitting circuit, N LED represents the number of LEDs on each first light emitting circuit, R j represents the sum of the resistance values of a plurality of 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 ith first current limiting resistor connected in series between the negative pole of rectifier diode D04 and electrode A, the first current limiting resistor is from resistor R i1 to resistor R i2 , represents the kth second current-limiting resistor in series on the jth first light-emitting circuit, and the second current-limiting resistor is from resistor to resistor

[0018] Compared with the prior art, the lamp color adjusting circuit of two-wire direct current power supply has the following beneficial effects:

[0019] 1. By means of the current control circuit, when the polarity of the electrode A and the electrode B is changed, the current flowing into the first light-emitting circuit and the second light-emitting circuit can be controlled, so that different colors of light can be emitted by the circuit, and further, by means of the current-limiting circuit, the voltage value of the positive and negative electrodes when the first light-emitting circuit emits light is greater than the voltage value of the positive and negative electrodes when the second light-emitting circuit emits light, so that when the electrode A is connected to the negative electrode, the voltage value between the electrode A and the electrode B is controlled to realize 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 mixture, thereby forming three kinds of light adjusting curves to expand the applicability of the product.

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

[0021] 3. By means of the rectifier diode, the turn-on voltage of the first light-emitting circuit and the second light-emitting circuit can be limited respectively, so that when the 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 light emission 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 DRAWINGS

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

[0023] Figure 1 It is a lamp color adjusting circuit of the prior art;

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

[0025] Figure 3 It is a lamp color adjusting circuit of the present application;

[0026] Figure 4 It is a light adjusting curve of the present application.

[0027] Fig. 1, first light-emitting circuit; 2, second light-emitting circuit; 3, current control circuit; 4, current limiting module. DETAILED DESCRIPTION

[0028] The embodiments of the present application will be described in detail with the accompanying drawings and examples, so that the realization process of how to apply technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented.

[0029] In order to solve the problem that the existing lamp color adjusting circuit often only has one dimming curve, the utility model provides a two-wire direct current power supply lamp color adjusting circuit, which can realize multiple dimming curves for one lamp color adjusting circuit, such as Figure 3 As shown, it includes positive and negative interchangeable electrodes A and B, and a plurality of first light-emitting circuits 1 connected to the positive and negative electrodes of the power supply 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 in a loop, such as Figure 3 As shown, there are 2 first light-emitting circuits 1 and 3 second light-emitting circuits 2. One of the first light-emitting circuits 1 is composed of light-emitting diodes D49, D50, D51, D52, D53, D54, D55, D56, D57, D58, D59, D60, D61 and D62, the other 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 of the second light-emitting circuits 2 is composed of light-emitting diodes D1-D16, the other is composed of light-emitting diodes D17-D32, and the last one is composed of light-emitting diodes D33-D48. The lamp color adjusting circuit further comprises 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 positive and the electrode B is negative, at which time the first light-emitting circuit 1 emits light of color 1. When the electrode A is negative and the electrode B is positive, the current is introduced into the first light-emitting circuit 1 and the second light-emitting circuit 2 at the same time, at which time the first light-emitting circuit 1 and the second light-emitting circuit 2 emit light of color 1 and color 2 respectively, so the current limiting module 4 is needed 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 when the first light-emitting circuit 1 emits light 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 example of the first light emitting circuit 1 emitting white light and the second light emitting circuit 2 emitting red light, when the voltage between the electrode A and the electrode B gradually increases, the color 2 emits first, i.e. the constant current diode red light intensity curve, and with the increase of the current, the color 1 starts to light up, i.e. the mixed light / white intensity curve, so as to mix with the color 2 to emit the mixed color, and the mixed color dimming curve is the constant current diode red mixed white intensity, and the mixed light / white intensity curve at this time is the white light intensity curve when the mixed light needs to be emitted, so that by changing the resistance value of the circuit in the current limiting module 4, the mixing ratio of the color 1 and the color 2 can be realized, so as to realize the purpose of emitting different mixed light, and thus three kinds of dimming curves are realized through one dimming circuit.

[0030] In order to further describe the control circuit of the current control circuit 3, the current control circuit 3 includes the rectifier diode D04 and the rectifier diode D02 connected in series between the electrode A and the electrode B, the negative electrodes of the rectifier diode D04 and the rectifier diode D02 are connected with the electrode A and the electrode B respectively, and the electrode A and the electrode B are further connected in series with the rectifier diode D01 and the rectifier diode D03, the positive electrodes of the rectifier diode D01 and the rectifier diode D03 are connected with the electrode A and the electrode B respectively, the current input ends of the first light emitting circuit 1 and the second light emitting circuit 2 are connected with the negative electrode 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 with the 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 electrodes of the electrode A and the electrode B.

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

[0032] The current limiting module 4 is used to control the resistance of the first light emitting circuit 1, so as to control the current through the first light emitting circuit 1, and thus control the light emission 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, and the current limiting module 4 includes a plurality of first current limiting resistors connected in series between the negative electrode of the rectifier diode D04 and the electrode A, such as the resistance R13 and the resistance R14 in Figure 3 , and a plurality of second current limiting resistors connected in series on the first light emitting circuit 1, such as the resistance R1 to the resistance R12 in Figure 3 , and the number of the first current limiting resistors and the second current limiting resistors is determined according to their own resistance values, so as to ensure the stable operation of the LED.

[0033] In order to enable the user to adjust the brightness when the color 1 and the color 2 are mixed according to the own needs, the first current limiting resistor is a variable resistor, so as to further change the mixed color.

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

[0035]

[0036] wherein,

[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, LED represents the unidirectional conduction voltage of a single LED on the first light-emitting circuit 1, LED represents the number of LEDs on each first light-emitting circuit 1, which is 2 as shown in Figure 3 R j represents the sum of the resistance values of a number of second current-limiting resistors connected in series on the jth first light-emitting circuit 1, and there are n first light-emitting circuits 1, i represents the ith first current-limiting resistor connected in series between the negative electrode of the rectifier diode D04 and electrode A, and the first current-limiting resistor is from resistor R i1 to resistor R i2 such as resistor R13 and resistor R14 in Figure 3 , represents the kth second current-limiting resistor connected in series on the jth first light-emitting circuit, and the second current-limiting resistor is from resistor to resistor such as resistor R1 to R6 in Figure 3 .

[0039] The following is an example of Figure 3 and Figure 4The parameters in the above-mentioned formula are further explained as follows: when the electrode A is the positive electrode and the electrode B is the negative electrode, the current passes through the rectifier diode D01 to the resistor R1 to the resistor R12, then flows through the light emitting diodes D49 to D76 to make them emit light of color 1, then passes through the rectifier diode D02 and the fuse F1 to return to the electrode B point to form a loop, and the first light adjusting curve, i.e. the light adjusting curve of color 1, is obtained by adjusting the input voltage from 36V to 48V; at this time, the second light emitting circuit 2 has no current flowing therethrough, and thus does not emit light of color 2;

[0040] When the electrode B is the positive electrode and the electrode A is the negative electrode, the current passes through the fuse F1 and the rectifier diode D03, flows through the constant current diodes D05, D06 and D07, then passes through the second light emitting circuit 2 composed of the light emitting diodes D1 to D48 to return to the electrode A to form a loop, and the light adjusting curve 2 of color 2 is obtained by adjusting the input voltage from 29V to 36V; since the constant current diodes are used, when the voltage reaches 36V, the current in the second light emitting circuit 2 will not change any more and is kept at a certain level; with the voltage continuing to increase, the current from the electrode B passes through the fuse F1, the rectifier diode D03, the resistors R1 to R12, the first light emitting circuit 1 composed of D49 to D76, the rectifier diode D04, the resistors R13 and R14 again, and finally returns to the electrode A to form a loop; since color 2 is kept at a certain level at this time, the curve in the stage of 36V to 48V is that a small amount of color 1 is mixed with color 2, and thus the light adjusting curve 3 is obtained; the mixed brightness proportion of color 1 can be controlled by the two adjustable resistors R13 and R14.

[0041] It is to be understood that the terminology used herein such as first and second, and the like, is only used to distinguish one entity or action from another entity or action, and does not necessarily require or imply any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0042] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A two-wire direct current powered lamp color modulation circuit comprising electrodes A and B which are reversible in polarity, and a plurality of first light emitting circuits (1) connected to the positive and negative poles of the power supply for emitting light of one color, and a plurality of second light emitting circuits (2) connected to the positive and negative poles of the power supply for emitting light of another color, characterized in that, Also comprising: a current control circuit (3) for leading current to the first light emitting circuit (1) when the electrode A is positive and the electrode B is negative, and leading current to the first light emitting circuit (1) and the second light emitting circuit (2) at the same time when the electrode A is negative and the electrode B is positive; a current limiting module (4) for accessing the first light emitting circuit (1) and controlling the voltage value of the positive and negative electrodes when the first light emitting circuit (1) emits light to be greater than the voltage value of the positive and negative electrodes when the second light emitting circuit (2) emits light, and controlling the light mixing ratio of the first light emitting circuit (1) and the second light emitting circuit (2).

2. The lamp color adjustment circuit of claim 1, wherein, The current control circuit (3) comprises rectifier diodes D04 and D02 connected in series between the electrode A and the electrode B, the negative electrodes of the rectifier diodes D04 and D02 are connected to the electrode A and the electrode B respectively, and the electrode A and the electrode B are also connected in series with rectifier diodes D01 and D03, the positive electrodes of the rectifier diodes D01 and D03 are connected to the electrode A and the 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 negative electrode output end between the rectifier diodes D01 and D03, the current output end of the first light emitting circuit (1) is connected between the rectifier diodes D04 and D02, and the current output end of the second light emitting circuit (2) is connected to the electrode A.

3. The lamp color adjustment circuit of claim 2, wherein, The electrode A and the electrode B are also connected with a filter capacitor C1.

4. The lamp color adjustment circuit of claim 2, wherein, The current limiting module (4) comprises a plurality of first current limiting resistors connected in series between the negative electrode of the rectifier diode D04 and the electrode A, and a plurality of second current limiting resistors connected in series on the first light emitting circuit (1).

5. The lamp color adjustment circuit of claim 4, wherein, The first current limiting resistor is a variable resistor.

6. The lamp color adjustment circuit of claim 1, wherein, A plurality of constant current diodes are connected in parallel on the second light emitting circuit (2).

7. The lamp color adjustment circuit of claim 4, wherein, The calculation formula of the light mixing ratio of the first light emitting circuit (1) and the second light emitting circuit (2) is: wherein, 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 the electrode A and the electrode B, V LED represents the unidirectional conduction voltage of a single LED on the first light emitting circuit, N LED represents the number of LEDs on each first light emitting circuit, R j represents the sum of resistance values of a plurality of second current limiting resistors connected in series on the jth first light emitting circuit, and there are n first light emitting circuits, R i represents the ith first current limiting resistor connected in series between the negative electrode of the rectifier diode D04 and the electrode A, and the first current limiting resistor is from resistance R i1 to resistance R i2 , represents the kth second current limiting resistor connected in series on the jth first light emitting circuit, and the second current limiting resistor is from resistance to resistance .

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