A two-wire color temperature LED light strip control circuit

Abstract

The utility model discloses a two-wire color temperature LED light strip control circuit, comprising a power module, a main control module, a first and a second driving module and a first, a second, a third and a fourth control module; the first driving module and the second driving module have a first output end and a second output end; the first control module is connected between the first output end of the first driving module, the positive pole of a cold light lamp group and the negative pole of a warm light lamp group; the second control module is connected between the second output end of the first driving module, the positive pole of the cold light lamp group and the negative pole of the warm light lamp group; the third control module is connected between the first output end of the second driving module, the negative pole of the cold light lamp group and the positive pole of the warm light lamp group; the fourth control module is connected between the second output end of the second driving module, the negative pole of the cold light lamp group and the positive pole of the warm light lamp group; through the above structure, only one signal line and one power line are needed to realize color temperature control, which simplifies the wiring of the light strip and has very good practicality.

Description

Technical Field

[0001] The utility model relates to the field of LED lamps, in particular to a two-wire color temperature LED light belt control circuit. Background Art

[0002] Light strips are a type of lamp widely used in lighting and decoration, and are popular for their low energy consumption and long life. Existing light strips, especially two-color light strips, are usually three-wire structures, namely a substrate and a group of white light LED lamp beads, a group of warm light LED lamp beads, a power line and two signal lines located on the substrate. The power line is used to provide working voltage for the white light LED lamp beads and the warm light LED lamp beads, and the two signal lines respectively control the brightness of the group of white light LED lamp beads and the group of warm light LED lamp beads, thereby achieving color temperature adjustment. However, in this light strip, there are three wiring harnesses on the substrate, which makes the width of the substrate larger, and also increases the wiring cost, which is not conducive to the miniaturization of the light strip. Therefore, a two-wire color temperature LED light strip control circuit is urgently needed to solve the above problems. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a two-wire color temperature LED light strip control circuit.

[0004] The technical solution adopted by an embodiment of the utility model to solve its technical problem is: a two-wire color temperature LED light strip control circuit, including a power module and a main control module connected to the power module, a first drive module, a second drive module, a first control module, a second control module, a third control module and a fourth control module;

[0005] The first driving module and the second driving module are connected to the output end of the main control module, and the first driving module and the second driving module have a first output end and a second output end;

[0006] The first control module is connected between the first output end of the first driving module, the positive electrode of the cold light lamp group and the negative electrode of the warm light lamp group;

[0007] The second control module is connected between the second output end of the first driving module, the positive electrode of the cold light lamp group and the negative electrode of the warm light lamp group;

[0008] The third control module is connected between the first output end of the second driving module, the negative electrode of the cold light lamp group and the positive electrode of the warm light lamp group;

[0009] The fourth control module is connected between the second output end of the second driving module, the negative electrode of the cold light lamp group and the positive electrode of the warm light lamp group;

[0010] The main control module can output two complementary PWM signals to control the forward output or reverse output of the first driving module and the second driving module to control the on and off of the cold light lamp group and the warm light lamp group.

[0011] As one of the preferred embodiments of the utility model, the first driving module includes a driving chip U1, a resistor R2, a resistor R18, a capacitor C6, a capacitor C9 and a diode D2. The IN pin of the driving chip U1 is connected to one end of the resistor R18 and is connected to the main control module via the resistor R2. One end of the capacitor C6, the anode of the diode D2 and the SD pin and VCC pin of the driving chip U1 are connected to the power supply module. The cathode of the diode D2 is respectively connected to the VB pin of the driving chip U1 and one end of the capacitor C9. The other end of the capacitor C9 is connected to the VS pin of the driving chip U1. The other end of the resistor R18, the COM pin of the driving chip U1 and one end of the capacitor C6 are grounded. The HO pin of the driving chip U1 is connected to the first control module, and the LO pin of the driving chip U1 is connected to the second control module.

[0012] As one of the preferred embodiments of the utility model, the first control module includes a resistor R4, a resistor R7, a diode D3 and a MOS tube Q2, one end of the resistor R4 is respectively connected to the first output end of the first driving module and the cathode of the diode D3, the other end of the resistor R4 is respectively connected to one end of the resistor R7, the anode of the diode D3 and the gate of the MOS tube Q2, the other end of the resistor R7 is respectively connected to the source of the MOS tube Q2, the positive electrode of the cold light lamp group and the negative electrode of the warm light lamp group, and the drain of the MOS tube Q2 is connected to the V+ terminal.

[0013] As one of the preferred embodiments of the present utility model, a two-wire color temperature LED light strip control circuit also includes a dimming signal module connected to the power module and the main control module respectively.

[0014] As one of the preferred embodiments of the present utility model, the dimming signal module is configured as an RF module.

[0015] As one of the preferred embodiments of the present utility model, a two-wire color temperature LED light strip control circuit further includes a key module connected to the main control module.

[0016] As one of the preferred embodiments of the present utility model, a two-wire color temperature LED light strip control circuit further includes a status indication module connected to the main control module.

[0017] The beneficial effects of the utility model: a two-wire color temperature LED light strip control circuit, including a power module and a main control module connected to the power module, a first drive module, a second drive module, a first control module, a second control module, a third control module and a fourth control module; the first drive module and the second drive module are connected to the output end of the main control module, and the first drive module and the second drive module have a first output end and a second output end; the first control module is connected between the first output end of the first drive module, the positive pole of the cold light lamp group and the negative pole of the warm light lamp group; the second control module is connected to the second output end of the first drive module, The third control module is connected between the first output end of the second driving module, the negative pole of the cold light lamp group and the positive pole of the warm light lamp group; the fourth control module is connected between the second output end of the second driving module, the negative pole of the cold light lamp group and the positive pole of the warm light lamp group; the main control module can output two complementary PWM signals to control the forward output or reverse output of the first driving module and the second driving module to control the on and off of the cold light lamp group and the warm light lamp group; through the above structure, only one signal line and one power line are needed to achieve color temperature control, which simplifies the wiring of the light strip and has very good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a principle block diagram of a two-wire color temperature LED light strip control circuit;

[0020] Figure 2 This is the circuit schematic diagram of the power module;

[0021] Figure 3 This is a schematic diagram of the first part of a two-wire color temperature LED light strip control circuit;

[0022] Figure 4 It is a circuit schematic diagram of the second part of a two-wire color temperature LED light strip control circuit;

[0023] Figure 5 This is the circuit schematic diagram of the dimming signal module. DETAILED DESCRIPTION

[0024] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0025] In the description of the present utility model, the meaning of "more than" is more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0026] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0028] Reference Figures 1 to 5 , a two-wire color temperature LED light strip control circuit, including a power module 10 and a main control module 20 connected to the power module 10, a first driving module 31, a second driving module 32, a first control module 41, a second control module 42, a third control module 43 and a fourth control module 44;

[0029] The first driving module 31 and the second driving module 32 are connected to the output end of the main control module 20, and the first driving module 31 and the second driving module 32 have a first output end and a second output end;

[0030] The first control module 41 is connected between the first output terminal of the first driving module 31 , the positive electrode of the cold light lamp group 50 , and the negative electrode of the warm light lamp group 60 ;

[0031] The second control module 42 is connected between the second output terminal of the first driving module 31 , the positive electrode of the cold light lamp group 50 , and the negative electrode of the warm light lamp group 60 ;

[0032] The third control module 43 is connected between the first output terminal of the second driving module 32 , the negative electrode of the cold light lamp group 50 , and the positive electrode of the warm light lamp group 60 ;

[0033] The fourth control module 44 is connected between the second output terminal of the second driving module 32 , the negative electrode of the cold light lamp group 50 , and the positive electrode of the warm light lamp group 60 ;

[0034] The main control module 20 can output two complementary PWM signals to control the first driving module 31 and the second driving module 32 to output forward or reverse, so as to control the on and off of the cold light lamp group 50 and the warm light lamp group 60 .

[0035] In the present invention, the main control module 20 mainly includes an MCU chip U2 (model CMS8S6990N) and its peripheral circuits. The first drive module 31 and the second drive module 32 can perform forward output and reverse output, thereby controlling the on and off of the four control modules to control the cold light group 50 and the warm light group 60;

[0036] ① The main control module 20 receives the dimming signal from the dimming signal module 70, obtains the brightness value and the color temperature value, and then outputs two complementary PWM pulse signals to the first driving module 31 and the second driving module 32;

[0037] ② For 2-wire color temperature light strips, only warm white is lit when the power is supplied in the forward direction, and only cool white is lit when the power is supplied in the reverse direction. By adjusting the time ratio of the forward power supply and the reverse power supply in the PWM mode, the color temperature adjustment from warm white to cool white can be achieved;

[0038] ③Specifically, the control principle is as follows:

[0039] 1. When PWM1 is at a high level, the HO pin of the driver chip U1 outputs a high level, the LO pin of the driver chip U1 outputs a low level, the MOS tube Q2 is turned on, the MOS tube Q4 is turned off, and the CW end outputs a high level;

[0040] 1. When PWM2 is at a high level, the HO pin of the driver chip U2 outputs a high level, the LO pin of the driver chip U2 outputs a low level, the MOS tube Q1 is turned on, the MOS tube Q3 is turned off, and the WW end outputs a high level. Since the CW end is also at a high level, it is equivalent to no output, and the light strip does not light up;

[0041] 2. When PWM2 is at a low level, the HO pin of the driver chip U2 outputs a low level, the LO pin of the driver chip U2 outputs a high level, the MOS tube Q1 is turned off and on, the MOS tube Q3 is turned on, and the WW terminal outputs a low level. Since the CW terminal is at a high level, only the cold light group 50 is on at this time;

[0042] 2. When PWM1 is at a low level, the HO pin of the driver chip U1 outputs a low level, the LO pin of the driver chip U1 outputs a high level, the MOS tube Q2 is turned off and turned on, the MOS tube Q4 is turned on, and the CW terminal outputs a low level;

[0043] 1. When PWM2 is at a high level, the HO pin of the driver chip U2 outputs a high level, the LO pin of the driver chip U2 outputs a low level, the MOS tube Q1 is turned on, the MOS tube Q3 is turned off, and the WW terminal outputs a high level. Since the CW terminal is at a low level, only the warm light group 60 is on at this time;

[0044] 2. When PWM2 is at a low level, the HO pin of the driver chip U2 outputs a low level, the LO pin of the driver chip U2 outputs a high level, Q1 is turned off and on, Q3 is turned on, and the WW terminal outputs a low level. Since the CW terminal is also at a low level, it is equivalent to no output, and the light strip does not light up;

[0045] 3. The CW terminal and the WW terminal can realize V+ output or V- output in a circuit. When the positive terminal of the cold light lamp group 50 is connected to CW and the negative terminal is connected to WW, and the positive terminal of the warm light lamp group 60 is connected to WW and the negative terminal is connected to CW, two-wire color temperature dimming control can be realized.

[0046] The utility model has the advantages that: through the above structure, only one signal line and one power line are needed to realize color temperature control, which simplifies the wiring of the light strip and has very good practicality.

[0047] As a preferred embodiment of the first driving module 31, the first driving module 31 includes a driving chip U1, a resistor R2, a resistor R18, a capacitor C6, a capacitor C9 and a diode D2. The IN pin of the driving chip U1 is connected to one end of the resistor R18 and is connected to the main control module 20 via the resistor R2. One end of the capacitor C6, the anode of the diode D2 and the SD pin and VCC pin of the driving chip U1 are connected to the power module 10. The cathode of the diode D2 is respectively connected to the VB pin of the driving chip U1 and one end of the capacitor C9. The other end of the capacitor C9 is connected to the VS pin of the driving chip U1. The other end of the resistor R18, the COM pin of the driving chip U1 and one end of the capacitor C6 are grounded. The HO pin of the driving chip U1 is connected to the first control module 41, and the LO pin of the driving chip U1 is connected to the second control module 42. It should be noted that the circuit of the second driving module 32 is consistent with that of the first driving module 31 and will not be repeated here.

[0048] As a preferred embodiment of the first control module 41, the first control module 41 includes a resistor R4, a resistor R7, a diode D3 and a MOS tube Q2, one end of the resistor R4 is respectively connected to the first output end of the first driving module 31 and the cathode of the diode D3, the other end of the resistor R4 is respectively connected to one end of the resistor R7, the anode of the diode D3 and the gate of the MOS tube Q2, the other end of the resistor R7 is respectively connected to the source of the MOS tube Q2, the positive electrode of the cold light lamp group 50 and the negative electrode of the warm light lamp group 60, and the drain of the MOS tube Q2 is connected to the V+ terminal; it should be noted that the circuits of the second control module 42, the third control module 43 and the fourth control module 44 are consistent with the first control module 41, and will not be repeated here.

[0049] In one embodiment, a two-wire color temperature LED light strip control circuit further includes a dimming signal module 70 connected to the power module 10 and the main control module 20 respectively.

[0050] As a preferred embodiment of the dimming signal module 70, the dimming signal module 70 is configured as an RF module.

[0051] In one embodiment, a two-wire color temperature LED light strip control circuit further includes a key module 80 connected to the main control module 20 .

[0052] In one embodiment, a two-wire color temperature LED light strip control circuit further includes a state indicating module 90 connected to the main control module 20, and used to indicate the state of the control circuit.

[0053] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. A two-wire color temperature LED light strip control circuit, characterized in that: It comprises a power module (10), a main control module (20) connected to the power module (10), a first drive module (31), a second drive module (32), a first control module (41), a second control module (42), a third control module (43) and a fourth control module (44); The first driving module (31) and the second driving module (32) are connected to the output end of the main control module (20), and the first driving module (31) and the second driving module (32) have a first output end and a second output end; The first control module (41) is connected between the first output end of the first driving module (31), the positive electrode of the cold light lamp group (50), and the negative electrode of the warm light lamp group (60); The second control module (42) is connected between the second output end of the first driving module (31), the positive electrode of the cold light lamp group (50), and the negative electrode of the warm light lamp group (60); The third control module (43) is connected between the first output end of the second driving module (32), the negative electrode of the cold light lamp group (50), and the positive electrode of the warm light lamp group (60); The fourth control module (44) is connected between the second output end of the second driving module (32), the negative electrode of the cold light lamp group (50), and the positive electrode of the warm light lamp group (60); The main control module (20) can output two complementary PWM signals to control the forward output or reverse output of the first drive module (31) and the second drive module (32), so as to control the on and off of the cold light lamp group (50) and the warm light lamp group (60).

2. A two-wire color temperature LED light strip control circuit according to claim 1, characterized in that: The first driving module (31) comprises a driving chip U1, a resistor R2, a resistor R18, a capacitor C6, a capacitor C9 and a diode D2; an IN pin of the driving chip U1 is connected to one end of the resistor R18 and is connected to the main control module (20) via the resistor R2; one end of the capacitor C6, an anode of the diode D2 and an SD pin and a VCC pin of the driving chip U1 are connected to the power module (10); a cathode of the diode D2 is respectively connected to the VB pin of the driving chip U1 and one end of the capacitor C9; the other end of the capacitor C9 is connected to the VS pin of the driving chip U1; the other end of the resistor R18, the COM pin of the driving chip U1 and one end of the capacitor C6 are grounded; the HO pin of the driving chip U1 is connected to the first control module (41); and the LO pin of the driving chip U1 is connected to the second control module (42).

3. A two-wire color temperature LED light strip control circuit according to claim 1, characterized in that: The first control module (41) comprises a resistor R4, a resistor R7, a diode D3 and a MOS tube Q2; one end of the resistor R4 is respectively connected to the first output end of the first drive module (31) and the cathode of the diode D3; the other end of the resistor R4 is respectively connected to one end of the resistor R7, the anode of the diode D3 and the gate of the MOS tube Q2; the other end of the resistor R7 is respectively connected to the source of the MOS tube Q2, the positive electrode of the cold light lamp group (50) and the negative electrode of the warm light lamp group (60); and the drain of the MOS tube Q2 is connected to the V+ terminal.

4. The two-wire color temperature LED light strip control circuit according to claim 1, characterized in that: It also includes a dimming signal module (70) connected to the power module (10) and the main control module (20) respectively.

5. A two-wire color temperature LED light strip control circuit according to claim 4, characterized in that: The dimming signal module (70) is configured as an RF module.

6. A two-wire color temperature LED light strip control circuit according to claim 1, characterized in that: It also includes a key module (80) connected to the main control module (20).

7. The two-wire color temperature LED light strip control circuit according to claim 1, characterized in that: It also includes a status indication module (90) connected to the main control module (20).

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