Light-emitting diode (LED) light mixing and changing split control device

Abstract

The utility model relates to the technical field of photoelectric illumination, and discloses an LED light mixing and changing split control device. The power supply comprises a rectification filtering module, a power factor correction and boost module, a pulse generation module and a shunt control module. According to the utility model, power supply power can be adjusted, and power supply efficiency and voltage can be improved; ripples can be effectively removed, the total current is kept unchanged, and real-time voltage can be fed back in time so as to adjust the voltage in real time, so that the voltage of the LED lamp group is kept stable; corresponding pulse signals can be output according to the voltage frequency change of the output end of the power factor correction and boost module, so that the signals of the LED current control end of the shunt control module are controlled to change correspondingly, the color temperature is adjusted, the pulse generation module is added, the electromagnetic interference of the circuit is reduced, and the stability is improved. The LED current control ends of the shunt control module are mutually independent, so that when any one LED lamp group is abnormal, other LED lamp groups are not influenced, and the reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optoelectronic lighting, in particular to an LED mixed-light variable-light split control device. Background Art

[0002] A light-emitting diode (LED) is a semiconductor component, mostly used as an indicator light, a light-emitting diode board, etc. With the emergence of white LEDs, LEDs are also used for lighting. As a new generation of green light source, compared with traditional light sources such as incandescent lamps, fluorescent lamps, and high-intensity discharge lamps, LEDs have many advantages such as energy saving, environmental protection, short response time, long lifespan, small size, and good seismic resistance, so they are favored by people and become a research hotspot in the field of semiconductor lighting in various countries.

[0003] However, the existing multi-channel LED lights adopt a series connection method. Once an LED light in one channel fails, the other group of LED lights cannot work properly, or in the case of multiple channels of LED lights, only one channel of LED lights can work properly at a time and cannot be lit simultaneously. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides an LED mixed-light variable-light split control device, which can enable multiple channels of LED lights to work simultaneously without affecting each other.

[0005] The LED mixed-light variable-light split control device according to an embodiment of the utility model is applied to at least two groups of LED lamp groups and includes:

[0006] A rectifying and filtering module, the input end of which is used for electrically connecting with an AC power supply;

[0007] A power factor correction and boost module, the input end of which is electrically connected with the output end of the rectifying and filtering module. The power factor correction and boost module can adjust the power factor and voltage of the rectifying and filtering module, and the output end of the power factor correction and boost module is electrically connected with the positive extreme ends of at least two groups of the LED lamp groups;

[0008] A constant current and sampling module, the first connection end of the constant current and sampling module is electrically connected with the output end of the power factor correction and boost module, and the sampled end of the constant current and sampling module is electrically connected with the feedback end of the power factor correction and boost module;

[0009] A pulse generating module, the input end of the pulse generating module is electrically connected with the output end of the power factor correction and boost module, and the output end of the pulse generating module outputs corresponding pulse signals according to the voltage change of the power factor correction and boost module;

[0010] A shunt control module, the input end of the shunt control module is electrically connected to the output end of the power factor correction and boost module, the control end of the shunt control module is electrically connected to the output end of the pulse generation module, the ground end of the shunt control module is electrically connected to the second connection end of the constant current and sampling module, the shunt control module has at least two LED current control ends, and each of the LED current control ends is respectively electrically connected to the negative electrode end of the corresponding LED lamp group. The shunt control module can adjust the color temperature of the corresponding LED lamp group according to the change of the pulse signal.

[0011] According to some embodiments of the present invention, the rectification and filtering module includes:

[0012] A filtering unit, the input end of the filtering unit is electrically connected to the AC power supply;

[0013] A rectifier bridge unit, the input end of the rectifier bridge unit is electrically connected to the output end of the filtering unit.

[0014] According to some embodiments of the present invention, the rectification and filtering module further includes a fuse FU, and the fuse FU is electrically connected between the filtering unit and the AC power supply.

[0015] According to some embodiments of the present invention, the power factor correction and boost module includes:

[0016] A switching transistor Q1, the drain of the switching transistor Q1 is electrically connected to the output end of the rectification and filtering module through an inductor L3, the drain of the switching transistor Q1 is also electrically connected to the pulse generation module and the input end of the shunt control module through a diode D1 respectively, and the source of the switching transistor Q1 is grounded through a resistor R4;

[0017] A chip U1, the current sampling end of the chip U1 is electrically connected to the source of the switching transistor Q1, the gate driving end of the chip U1 is electrically connected to the gate of the switching transistor Q1, and the high-voltage start and power supply end of the chip U1 is electrically connected to the output end of the rectification and filtering module through a resistor R6;

[0018] An energy storage capacitor CD3, the positive electrode of the energy storage capacitor CD3 is electrically connected to the negative electrode end of the diode D1, the negative electrode of the energy storage capacitor CD3 is grounded, and a resistor R9 is also connected in parallel across the two ends of the energy storage capacitor CD3;

[0019] A feedback unit, the sampling end of the feedback unit is electrically connected to the sampled end of the constant current and sampling module, and the output end of the feedback unit is electrically connected to the feedback end of the chip U1.

[0020] According to some embodiments of the present utility model, the feedback unit includes:

[0021] A voltage stabilizing diode DW1, the positive terminal of the voltage stabilizing diode DW1 is electrically connected to the feedback terminal of the chip U1 through a resistor R10, and the negative terminal of the voltage stabilizing diode DW1 is grounded through a capacitor;

[0022] A diode D3, the negative terminal of the diode D3 is electrically connected to the negative terminal of the voltage stabilizing diode DW1, and the positive terminal of the diode D3 serves as the sampling terminal of the feedback unit.

[0023] According to some embodiments of the present utility model, the constant current and sampling module includes:

[0024] A switching transistor Q2, the drain of the switching transistor Q2 is sequentially electrically connected to the output terminal of the power factor correction and boost module through a resistor R12 and a resistor R11, and the source of the switching transistor Q2 is grounded;

[0025] A voltage stabilizing diode DW2, the positive terminal of the voltage stabilizing diode DW2 is grounded together with the source of the switching transistor Q2, and the negative terminal of the voltage stabilizing diode DW2 is connected to the connection node between the resistor R12 and the resistor R11;

[0026] A switching transistor Q3, the gate of the switching transistor Q3 is electrically connected to the drain of the switching transistor Q2, the source of the switching transistor Q3 is electrically connected to the gate of the switching transistor Q2 through a resistor R13, the source of the switching transistor Q3 is also grounded through a resistor R14, the drain of the switching transistor Q3 is electrically connected to the ground terminal of the shunt control module, the drain of the switching transistor Q3 is also grounded through a resistor R15, a temperature resistor NTC, and a resistor R16 in sequence, and the source of the switching transistor Q3 is also electrically connected to the node between the resistor R15 and the temperature resistor NTC;

[0027] A sampling unit, the input terminal of the sampling unit is electrically connected to the drain of the switching transistor Q3, and the sampled terminal of the sampling unit is electrically connected to the feedback terminal of the power factor correction and boost module.

[0028] According to some embodiments of the present utility model, the sampling unit includes a resistor R17 and a resistor R18, one end of the resistor R17 is electrically connected to the drain of the switching transistor Q3, the other end of the resistor R17 is grounded through the resistor R18, and the node between the resistor R17 and the resistor R18 serves as the sampled terminal of the constant current and sampling module.

[0029] According to some embodiments of the present utility model, the pulse generation module includes:

[0030] A triode BG, the base of the triode BG is electrically connected to the output terminal of the power factor correction and boost module in sequence through a resistor R21, a capacitor C9, and a resistor R19. The collector of the triode BG is electrically connected to the control terminal of the shunt control module. The collector of the triode BG is electrically connected to the output terminal of the power factor correction and boost module through a resistor R22. The collector of the triode BG is also electrically connected to the ground terminal of the shunt control module through a resistor R23;

[0031] A diode D4, the negative terminal of the diode D4 is electrically connected to the node between the resistor R21 and the capacitor C9, and the positive terminal of the diode D4 is electrically connected to the emitter of the triode BG;

[0032] A resistor R20, one end of the resistor R20 is electrically connected to the node between the capacitor C9 and the resistor R19, and the other end of the resistor R20 is electrically connected to the positive terminal of the diode D4.

[0033] According to some embodiments of the present invention, the shunt control module includes:

[0034] A chip U2, the power supply terminal of the chip U2 is electrically connected to the output terminal of the power factor correction and boost module through a resistor R25. The clock terminal of the chip U2 is electrically connected to the output terminal of the pulse generation module through a resistor R24. The chip U2 has at least two output terminals;

[0035] A shunt unit, having at least two output terminals. Each output terminal of the shunt unit is electrically connected to the corresponding output terminal of the chip U2 and serves as one of the LED current control terminals. The ground terminal of the shunt unit is electrically connected to the ground terminal of the chip U2.

[0036] According to some embodiments of the present invention, the shunt unit includes at least two shunt resistors. One end of each shunt resistor is electrically connected to the corresponding output terminal of the chip U2, and the other end of each shunt resistor is electrically connected to the ground terminal of the chip U2.

[0037] The embodiments of the present utility model at least have the following beneficial effects: The rectification and filtering module can convert the AC power supply into DC power and can effectively suppress electromagnetic interference; the power factor correction and boost module can adjust the power of the power supply to improve the efficiency of the power supply and boost the voltage; the constant current and sampling module can effectively remove the ripple, keep the total current of all LED lamp groups unchanged, and can timely feedback the real-time voltage of the LED lamp groups to the power factor correction and boost module so that the power factor correction and boost module can adjust the voltage in real time to keep the voltage of the working LED lamp groups stable; the pulse generation module can output corresponding pulse signals according to the change of the voltage frequency at the output end of the power factor correction and boost module, and then control the signals of at least two LED current control ends of the shunt control module to change accordingly to adjust the color temperature of the corresponding LED lamp groups. At the same time, adding the pulse generation module can further reduce the electromagnetic interference of the circuit and further improve the stability of the circuit. In addition, since the LED current control ends of the shunt control module are independent of each other, even if any group of LED lamp groups has an abnormality, it will not affect other LED lamp groups, effectively improving the reliability.

[0038] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0040] Figure 1 is a schematic circuit diagram of the LED mixed light and variable light split control device according to the embodiment of the present utility model;

[0041] Figure 2 is Figure 1 a schematic circuit structure diagram of the rectification and filtering module and the power factor correction and boost module of the shown LED mixed light and variable light split control device;

[0042] Figure 3 is Figure 1 a schematic circuit structure diagram of the constant current and sampling module, the pulse generation module and the shunt control module of the shown LED mixed light and variable light split control device.

[0043] Reference Signs:

[0044]

[0045] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] The concept, specific structure and technical effects of the present utility model will be clearly and completely described below in conjunction with the embodiments and the drawings, so as to fully understand the purpose, solution and effects of the present utility model. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0047] It should be noted that, unless otherwise specified, when a certain feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. In addition, the descriptions such as up, down, left, right, top, bottom, etc. used in the present utility model are only relative to the mutual positional relationship of the various components of the present utility model in the drawings.

[0048] It should be noted that, unless otherwise specified, when a certain feature is referred to as "electrically connected" or "electrically connected" to another feature, the two features can be directly connected through pins, or connected through cables, or connected by means of wireless transmission. The specific electrical connection method belongs to the general methods of those skilled in the art, and those skilled in the art can achieve the connection according to needs.

[0049] In addition, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present application. The terms used in the description of the present specification are only for describing specific embodiments, rather than for limiting the present utility model. The term "and / or" used herein includes any combination of one or more of the related listed items.

[0050] It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various elements, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from each other. For example, without departing from the scope of the present disclosure, the first element may also be referred to as the second element, and similarly, the second element may also be referred to as the first element.

[0051] Refer to Figure 1, the LED mixed light variable light split control device according to the embodiment of the present invention is applied to at least two groups of LED lamp groups, and includes a rectifier filter module 100, a power factor correction and boost module 200, a pulse generation module 400, and a shunt control module 500; the input end of the rectifier filter module 100 is used to be electrically connected to an AC power supply; the input end of the power factor correction and boost module 200 is electrically connected to the output end of the rectifier filter module 100, and the power factor correction and boost module 200 can adjust the power factor and voltage of the rectifier filter module 100, and the output end of the power factor correction and boost module 200 is electrically connected to the positive extreme ends of at least two groups of the LED lamp groups; the first connection end of the constant current and sampling module 300 is electrically connected to the output end of the power factor correction and boost module 200, and the sampled end of the constant current and sampling module 300 is electrically connected to the feedback end of the power factor correction and boost module 200; the input end of the pulse generation module 400 is electrically connected to the output end of the power factor correction and boost module 200, and the output end of the pulse generation module 400 outputs a corresponding pulse signal according to the voltage change of the power factor correction and boost module 200; the input end of the shunt control module 500 is electrically connected to the output end of the power factor correction and boost module 200, the control end of the shunt control module 500 is electrically connected to the output end of the pulse generation module 400, the grounding end of the shunt control module 500 is electrically connected to the second connection end of the constant current and sampling module 300, the shunt control module 500 has at least two LED current control ends, and each LED current control end is respectively electrically connected to the negative extreme end of the corresponding LED lamp group, and the shunt control module 500 can adjust the color temperature of the corresponding LED lamp group according to the change of the pulse signal.

[0052] Working principle:

[0053] The rectification and filtering module 100 can convert the AC power supply into DC power and can effectively suppress electromagnetic interference; the power factor correction and boost module 200 can adjust the power of the power supply to improve the efficiency of the power supply and boost the voltage; the constant current and sampling module 300 can effectively remove the ripple, and can keep the total current of all LED lamp groups unchanged, and can timely feedback the real-time voltage of the LED lamp groups to the power factor correction and boost module 200, so that the power factor correction and boost module 200 can adjust the voltage in real time to keep the voltage of the working LED lamp groups stable; the pulse generation module 400 can output corresponding pulse signals according to the voltage frequency change at the output end of the power factor correction and boost module 200, and then control the signals of at least two LED current control ends of the shunt control module 500 to change correspondingly, so as to adjust the color temperature of the corresponding LED lamp groups. At the same time, adding the pulse generation module 400 can further reduce the electromagnetic interference of the circuit and further improve the stability of the circuit. In addition, since the LED current control ends of the shunt control module 500 are independent of each other, even if any group of LED lamp groups has an abnormality, it will not affect other LED lamp groups, effectively improving the reliability.

[0054] Referring to Figure 2 , in some embodiments of the present invention, the rectification and filtering module 100 includes:

[0055] A filtering unit 110, the input end of the filtering unit 110 is electrically connected to the AC power supply;

[0056] A rectifier bridge unit 120, the input end of the rectifier bridge unit 120 is electrically connected to the output end of the filtering unit 110.

[0057] Among them, in some embodiments of the present invention, the filtering unit 110 adopts an EMC circuit, which can improve the anti-interference ability against electromagnetic harassment, helps to ensure that the remaining modules can remain stable in various electromagnetic environments, and can effectively improve the stability and reliability of the circuit. The rectifier bridge unit 120 adopts a conventional rectifier bridge structure, which can convert alternating current into direct current and provide a stable DC voltage for the subsequent circuit.

[0058] Referring to Figure 2 , in some embodiments of the present invention, the rectification and filtering module 100 further includes a fuse FU, and the fuse FU is electrically connected between the filtering unit 110 and the AC power supply.

[0059] Adding the fuse FU can achieve the following functions including but not limited to:

[0060] Overload protection: When the current in the circuit exceeds the rated current of the fuse FU, the metal wire or metal sheet inside the fuse FU will melt due to overheating, thus cutting off the circuit;

[0061] Short-circuit protection: When a short circuit occurs in the circuit, a very large current will be generated. The fuse FU can respond quickly and melt to prevent the circuit and equipment from being damaged due to overcurrent;

[0062] Isolate the power supply: When repairing or replacing some components in the circuit, the fuse FU can act as an isolation device to ensure that no current will pass through in the off state, ensuring safety;

[0063] Prevent fire: By cutting off the overload or short-circuit current in time, the fuse FU can prevent fires caused by electrical faults.

[0064] Refer to Figure 2 , in some embodiments of the present invention, the power factor correction and boost module 200 includes:

[0065] Switching transistor Q1, the drain of the switching transistor Q1 is electrically connected to the output terminal of the rectification and filtering module 100 through an inductor L3. The drain of the switching transistor Q1 is also electrically connected to the input terminals of the pulse generation module 400 and the shunt control module 500 through a diode D1 respectively. The source of the switching transistor Q1 is grounded through a resistor R4;

[0066] Chip U1, the current sampling terminal of the chip U1 is electrically connected to the source of the switching transistor Q1, the gate driving terminal of the chip U1 is electrically connected to the gate of the switching transistor Q1, and the high-voltage start-up and power supply terminal of the chip U1 is electrically connected to the output terminal of the rectification and filtering module 100 through a resistor R6;

[0067] Energy storage capacitor CD3, the positive electrode of the energy storage capacitor CD3 is electrically connected to the negative terminal of the diode D1, the negative electrode of the energy storage capacitor CD3 is grounded, and a resistor R9 is also connected in parallel across the two ends of the energy storage capacitor CD3;

[0068] Feedback unit 210, the sampling terminal of the feedback unit 210 is electrically connected to the sampled terminal of the constant current and sampling module 300, and the output terminal of the feedback unit 210 is electrically connected to the feedback terminal of the chip U1.

[0069] Refer to Figure 2 , in some embodiments of the present invention, the feedback unit 210 includes:

[0070] Zener diode DW1, the positive terminal of the zener diode DW1 is electrically connected to the feedback terminal of the chip U1 through a resistor R10, and the negative terminal of the zener diode DW1 is grounded through a capacitor;

[0071] Diode D3, the negative terminal of the diode D3 is electrically connected to the negative terminal of the voltage stabilizing diode DW1, and the positive terminal of the diode D3 serves as the sampling terminal of the feedback unit 210.

[0072] In addition, the power factor correction and boost module 200 further includes relevant circuit structures as Figure 2 described in, to ensure that the power factor correction and boost module 200 can work stably. Among them, the chip U1 is a power factor correction chip, which can improve the power factor of the power supply and improve energy efficiency. By controlling the on-off of the switching transistor Q1, the inductor L3 can be charged and discharged, and at the same time, the voltage can be increased and the energy storage capacitor CD3 can be charged to achieve power factor correction and boost, and the voltage can be output in a constant voltage manner, improving the reliability; in addition, by using the feedback unit 210, the voltage change of the LED lamp group can be detected in real time, so that the output voltage can be adjusted in real time to ensure that the voltage of the LED lamp group remains stable, further improving the reliability. Among them, the specific model selection of the chip U1 can be selected according to the actual circuit parameters and requirements, which belongs to the conventional technical means in the art and will not be elaborated in detail here.

[0073] Referring to Figure 3 , in some embodiments of the present invention, the constant current and sampling module 300 includes:

[0074] Switching transistor Q2, the drain of the switching transistor Q2 is electrically connected to the output terminal of the power factor correction and boost module 200 through the resistor R12 and the resistor R11 in sequence, and the source of the switching transistor Q2 is grounded;

[0075] Voltage stabilizing diode DW2, the positive terminal of the voltage stabilizing diode DW2 is grounded together with the source of the switching transistor Q2, and the negative terminal of the voltage stabilizing diode DW2 is connected to the connection node between the resistor R12 and the resistor R11;

[0076] Switching transistor Q3, the gate of the switching transistor Q3 is electrically connected to the drain of the switching transistor Q2, the source of the switching transistor Q3 is electrically connected to the gate of the switching transistor Q2 through the resistor R13, the source of the switching transistor Q3 is also grounded through the resistor R14, the drain of the switching transistor Q3 is electrically connected to the ground terminal of the shunt control module 500, the drain of the switching transistor Q3 is also grounded through the resistor R15, the temperature resistor NTC and the resistor R16 in sequence, and the source of the switching transistor Q3 is also electrically connected to the node between the resistor R15 and the temperature resistor NTC;

[0077] A sampling unit 310, an input end of the sampling unit 310 is electrically connected to a drain of the switching transistor Q3, and a sampled end of the sampling unit 310 is electrically connected to a feedback end of the power factor correction and boost module 200.

[0078] Referring Figure 3 , in some embodiments of the present invention, the sampling unit 310 includes a resistor R17 and a resistor R18. One end of the resistor R17 is electrically connected to the drain of the switching transistor Q3, the other end of the resistor R17 is grounded through the resistor R18, and a node between the resistor R17 and the resistor R18 serves as the sampled end of the constant current and sampling module 300.

[0079] Among them, by cooperatively controlling the on-off states of the switching transistors Q2 and Q3 and the real-time change of the temperature resistor NTC, the output current of the power factor correction and boost module 200 can be adjusted in real time according to the voltage change of the LED lamp group, so as to ensure that the total current remains unchanged. The sampling unit 310 can collect the voltage change of the LED lamp group in real time and then feed it back to the feedback unit 210 in real time, so as to ensure that the power factor correction and boost module 200 can stably output, and further reduce the voltage change amplitude to reduce the influence of the ripple voltage.

[0080] Referring Figure 3 , in some embodiments of the present invention, the pulse generation module 400 includes:

[0081] A triode BG, a base of the triode BG is sequentially electrically connected to an output end of the power factor correction and boost module 200 through a resistor R21, a capacitor C9 and a resistor R19. A collector of the triode BG is electrically connected to a control end of the shunt control module 500. The collector of the triode BG is electrically connected to the output end of the power factor correction and boost module 200 through a resistor R22. The collector of the triode BG is also electrically connected to a ground end of the shunt control module 500 through a resistor R23;

[0082] A diode D4, a negative end of the diode D4 is electrically connected to a node between the resistor R21 and the capacitor C9, and a positive end of the diode D4 is electrically connected to an emitter of the triode BG;

[0083] A resistor R20, one end of the resistor R20 is electrically connected to a node between the capacitor C9 and the resistor R19, and the other end of the resistor R20 is electrically connected to the positive end of the diode D4.

[0084] By using the triode BG, it is possible to control the change of the control terminal signal of the shunt control module 500 according to the change of the real-time power factor correction and the output voltage of the boost module 200, so as to adjust the change of the output signals of at least two LED current control terminals, thereby realizing the adjustment of the color temperature of the LED lamp group. In addition, the pulse generation module 400 uses relevant circuit structures such as the pulse triode BG and the diode D4, which can not only control the shunt control module 500, but also improve the electromagnetic anti-interference ability of the circuit, further improving the reliability.

[0085] Referring to Figure 3 , in some embodiments of the present invention, the shunt control module 500 includes:

[0086] A chip U2, the power supply terminal of the chip U2 is electrically connected to the output terminal of the power factor correction and boost module 200 through a resistor R25, the clock terminal of the chip U2 is electrically connected to the output terminal of the pulse generation module 400 through a resistor R24, and the chip U2 has at least two output terminals;

[0087] A shunt unit 510, having at least two output terminals, each output terminal of the shunt unit 510 is electrically connected to the corresponding output terminal of the chip U2 and serves as one of the LED current control terminals, and the ground terminal of the shunt unit 510 is electrically connected to the ground terminal of the chip U2.

[0088] Among them, the chip U2 is a conventional dimming chip, which can synchronously adjust the signals of at least two output terminals of the chip U2 to adjust the color temperature change of the corresponding LED lamp group. Those skilled in the art can select a suitable model according to actual needs, and the specific selection method will not be described here; at the same time, the shunt unit 510 can control the total current of at least two LED lamp groups to remain unchanged, shunt according to a ratio, and ensure that the LED lamp groups do not affect each other and can work independently.

[0089] Referring to Figure 3 , in some embodiments of the present invention, the shunt unit 510 includes at least two shunt resistors, one end of each shunt resistor is electrically connected to the corresponding output terminal of the chip U2, and the other end of each shunt resistor is electrically connected to the ground terminal of the chip U2. Specifically, by using shunt resistors with different resistance values, it is possible to divide the total current output by the power factor correction and boost module 200 into currents with different ratios and input them into the corresponding LED lamp groups.

[0090] Specifically, it can be seen Figure 3 , in this embodiment, the chip U2 has two output terminals, and at the same time, the shunt unit 510 includes two shunt resistors, namely the resistor R26 and the resistor R27, and the specific connection method is asFigure 3 As shown, it can be seen that the two LED lamp groups are in a parallel connection mode. The voltages of the two LED lamp groups are the same, and the total current remains unchanged. Each shunt resistor is also synchronously connected to the sampling unit 310 to facilitate real-time sampling of the voltage of the LED lamp group.

[0091] According to the embodiments of the present invention, by setting it in this way, at least the following effects can be achieved. The rectification and filtering module 100 can convert the AC power supply into DC power and effectively suppress electromagnetic interference. The power factor correction and boost module 200 can adjust the power of the power supply to improve the efficiency of the power supply and boost the voltage. The constant current and sampling module 300 can effectively remove ripples, keep the total current of all LED lamp groups unchanged, and timely feedback the real-time voltage of the LED lamp group to the power factor correction and boost module 200, so that the power factor correction and boost module 200 can adjust the voltage in real time to keep the voltage of the working LED lamp group stable. The pulse generation module 400 can output corresponding pulse signals according to the change of the voltage frequency at the output end of the power factor correction and boost module 200, and then control the signals of at least two LED current control ends of the shunt control module 500 to change accordingly, so as to adjust the color temperature of the corresponding LED lamp group. At the same time, adding the pulse generation module 400 can further reduce the electromagnetic interference of the circuit and further improve the stability of the circuit. In addition, since the LED current control ends of the shunt control module 500 are independent of each other, even if any one group of LED lamp groups has an abnormality, it will not affect other LED lamp groups, effectively improving the reliability.

[0092] The above is only the preferred embodiment of the present invention. The present invention is not limited to the above implementation manners. As long as it achieves the technical effects of the present invention by the same means, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure. All should belong to the protection scope of the present invention. Within the protection scope of the present invention, its technical solutions and / or implementation manners can have various different modifications and changes.

Claims

1. A LED light mixing and light changing split control device, applied to at least two groups of LED lamps, characterized in that: include: A rectifier and filter module (100), the input end of which is used to be electrically connected to an AC power source; A power factor correction and boost module (200), the input end of which is electrically connected to the output end of the rectification and filtering module (100), the power factor correction and boost module (200) being capable of adjusting the power factor and voltage of the rectification and filtering module (100), and the output end of the power factor correction and boost module (200) being electrically connected to the positive terminals of at least two groups of the LED lamp groups; A constant current and sampling module (300), wherein a first connection end of the constant current and sampling module (300) is electrically connected to an output end of the power factor correction and boost module (200), and a sampled end of the constant current and sampling module (300) is electrically connected to a feedback end of the power factor correction and boost module (200); A pulse generating module (400), wherein the input end of the pulse generating module (400) is electrically connected to the output end of the power factor correction and boosting module (200), and the output end of the pulse generating module (400) outputs a corresponding pulse signal according to a voltage change of the power factor correction and boosting module (200); A shunt control module (500), wherein the input end of the shunt control module (500) is electrically connected to the output end of the power factor correction and boost module (200), the control end of the shunt control module (500) is electrically connected to the output end of the pulse generation module (400), the ground end of the shunt control module (500) is electrically connected to the second connection end of the constant current and sampling module (300), the shunt control module (500) has at least two LED current control ends, each of the LED current control ends is electrically connected to the negative end of the corresponding LED lamp group, and the shunt control module (500) can adjust the color temperature of the corresponding LED lamp group according to the change of the pulse signal.

2. The LED light mixing and light changing split control device according to claim 1, characterized in that: The rectification and filtering module (100) comprises: A filter unit (110), wherein an input end of the filter unit (110) is electrically connected to the AC power source; A rectifier bridge unit (120), wherein an input end of the rectifier bridge unit (120) is electrically connected to an output end of the filter unit (110).

3. The LED light mixing and light changing split control device according to claim 2, characterized in that: The rectification and filtering module (100) further comprises a fuse FU, wherein the fuse FU is electrically connected between the filtering unit (110) and the AC power source.

4. The LED light mixing and light changing split control device according to any one of claims 1 to 3, characterized in that: The power factor correction and boost module (200) comprises: A switch tube Q1, wherein the drain of the switch tube Q1 is electrically connected to the output end of the rectifier filter module (100) through an inductor L3, the drain of the switch tube Q1 is also electrically connected to the input ends of the pulse generation module (400) and the shunt control module (500) through a diode D1, and the source of the switch tube Q1 is grounded through a resistor R4; A chip U1, wherein a current sampling terminal of the chip U1 is electrically connected to a source of the switch tube Q1, a gate driving terminal of the chip U1 is electrically connected to a gate of the switch tube Q1, and a high-voltage startup and power supply terminal of the chip U1 is electrically connected to an output terminal of the rectifier and filter module (100) via a resistor R6; An energy storage capacitor CD3, wherein the positive electrode of the energy storage capacitor CD3 is electrically connected to the negative terminal of the diode D1, the negative electrode of the energy storage capacitor CD3 is grounded, and both ends of the energy storage capacitor CD3 are also connected in parallel with a resistor R9; A feedback unit (210), wherein a sampling end of the feedback unit (210) is electrically connected to a sampled end of the constant current and sampling module (300), and an output end of the feedback unit (210) is electrically connected to a feedback end of the chip U1.

5. The LED light mixing and light changing split control device according to claim 4, characterized in that: The feedback unit (210) comprises: A voltage zener diode DW1, wherein the positive terminal of the voltage zener diode DW1 is electrically connected to the feedback terminal of the chip U1 through a resistor R10, and the negative terminal of the voltage zener diode DW1 is grounded through a capacitor; A diode D3, wherein the cathode terminal of the diode D3 is electrically connected to the cathode terminal of the voltage stabilizing diode DW1, and the anode terminal of the diode D3 serves as a sampling terminal of the feedback unit (210).

6. The LED light mixing and light changing split control device according to any one of claims 1 to 3, characterized in that: The constant current and sampling module (300) comprises: A switch tube Q2, wherein the drain of the switch tube Q2 is electrically connected to the output end of the power factor correction and boost module (200) through a resistor R12 and a resistor R11 in sequence, and the source of the switch tube Q2 is grounded; A voltage zener diode DW2, wherein the positive terminal of the voltage zener diode DW2 and the source of the switch tube Q2 are grounded together, and the negative terminal of the voltage zener diode DW2 is connected to a connection node between the resistor R12 and the resistor R11; A switch tube Q3, wherein the gate of the switch tube Q3 is electrically connected to the drain of the switch tube Q2, the source of the switch tube Q3 is electrically connected to the gate of the switch tube Q2 via a resistor R13, the source of the switch tube Q3 is also grounded via a resistor R14, the drain of the switch tube Q3 is electrically connected to the ground end of the shunt control module (500), the drain of the switch tube Q3 is also grounded via a resistor R15, a temperature resistor NTC and a resistor R16 in sequence, and the source of the switch tube Q3 is also electrically connected to a node between the resistor R15 and the temperature resistor NTC; A sampling unit (310), wherein an input end of the sampling unit (310) is electrically connected to the drain of the switch tube Q3, and a sampled end of the sampling unit (310) is electrically connected to a feedback end of the power factor correction and boost module (200).

7. The LED light mixing and light changing split control device according to claim 6, characterized in that: The sampling unit (310) comprises a resistor R17 and a resistor R18, one end of the resistor R17 is electrically connected to the drain of the switch tube Q3, the other end of the resistor R17 is grounded through the resistor R18, and the node between the resistor R17 and the resistor R18 serves as the sampled end of the constant current and sampling module (300).

8. The LED light mixing and light changing split control device according to any one of claims 1 to 3, characterized in that: The pulse generation module (400) comprises: A transistor BG, the base of the transistor BG being electrically connected to the output end of the power factor correction and boost module (200) through a resistor R21, a capacitor C9 and a resistor R19 in sequence, the collector of the transistor BG being electrically connected to the control end of the shunt control module (500), the collector of the transistor BG being electrically connected to the output end of the power factor correction and boost module (200) through a resistor R22, and the collector of the transistor BG being electrically connected to the ground end of the shunt control module (500) through a resistor R23; A diode D4, wherein a cathode terminal of the diode D4 is electrically connected to a node between the resistor R21 and the capacitor C9, and an anode terminal of the diode D4 is electrically connected to an emitter of the transistor BG; The resistor R20 has one end electrically connected to a node between the capacitor C9 and the resistor R19 , and the other end electrically connected to a positive terminal of the diode D4 .

9. The LED light mixing and light changing split control device according to any one of claims 1 to 3, characterized in that: The flow diversion control module (500) comprises: A chip U2, wherein the power supply end of the chip U2 is electrically connected to the output end of the power factor correction and boost module (200) via a resistor R25, the clock end of the chip U2 is electrically connected to the output end of the pulse generation module (400) via a resistor R24, and the chip U2 has at least two output ends; The shunt unit (510) has at least two output ends, each output end of the shunt unit (510) is electrically connected to the output end corresponding to the chip U2 and serves as one of the LED current control ends, and the ground end of the shunt unit (510) is electrically connected to the ground end of the chip U2.

10. The LED light mixing and light changing split control device according to claim 9, characterized in that: The shunt unit (510) includes at least two shunt resistors, one end of each shunt resistor is electrically connected to the output end corresponding to the chip U2, and the other end of each shunt resistor is electrically connected to the ground end of the chip U2.

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