AC power carrier two-wire system LED dimming and color adjusting driving circuit and driving method

Abstract

The application relates to the field of circuit control, and provides an alternating-current power carrier two-wire system LED dimming and color adjusting driving circuit and a driving method. The circuit comprises an alternating-current dimmer and an LED circuit, and the alternating-current dimmer outputs a dimming signal to control the LED circuit. The alternating-current dimmer comprises a zero-crossing synchronization acquisition loop and a power supply loop. The input end of the zero-crossing synchronization acquisition loop is connected with an AC power supply, and the output end of the power supply loop is connected with the LED circuit. The zero-crossing synchronization acquisition loop is used for outputting a low level when the input AC voltage is far away from zero, and outputting a high level when the input AC voltage is close to zero. The power supply loop comprises a main switch loop and a discharge loop. The main switch loop is used for cutting off energy transmission when the AC voltage is close to zero, and the discharge loop is used for rapidly discharging the capacitor on the circuit. The application solves the defects of high cost and light flicker in the related art, and the scheme can realize light full-process non-flicker through zero-crossing point detection and active rapid discharge.

Description

Technical Field

[0001] This invention relates to the field of circuit control technology, and in particular to a two-wire AC power carrier LED dimming and color-tuning driving circuit and driving method. Background Technology

[0002] Existing LED dimming technologies mainly include three solutions: silicon controlled rectifier (SCR) phase-cut dimming, four-wire 0-10V / DALI digital dimming, and traditional two-wire power line carrier dimming. While SCR phase-cut dimming has the largest market share, it only supports single-channel brightness adjustment and cannot achieve warm / cool color temperature or RGB multi-color mixing. Furthermore, the driver input capacitor and the distributed line current are prone to LC resonance, resulting in severe flicker when grid harmonics or voltage fluctuations exceed ±10%. Four-wire 0-10V / DALI digital dimming supports multi-color dimming, but requires independent signal wiring, making it incompatible with existing two-core lighting circuits in older buildings, leading to high renovation costs and long construction periods. Traditional two-wire power line carrier dimming only superimposes a small carrier signal onto a sine wave to transmit brightness commands, but the load capacitance causes waveform tailing distortion, and terminal decoding is prone to failure under harmonic interference. Additionally, an extra PLC module needs to be installed at the LED end, resulting in high costs and a lack of market competitiveness.

[0003] None of the above-mentioned existing technologies can simultaneously meet the following requirements: First, no rewiring is required, and the transformation can be completed using only the existing two-core circuit; second, it supports warm and cool color temperature / RGBW multi-color mixing adjustment to meet diverse lighting needs; third, it can still work stably without flicker in the environment of power grid fluctuations and harmonic interference to ensure lighting quality. Summary of the Invention

[0004] This invention provides a two-wire AC power carrier LED dimming and color-tuning driving circuit and driving method to solve the defects of high cost and light flicker in related technologies. The solution of this application can achieve flicker-free lighting throughout the entire process through zero-crossing detection and active fast discharge.

[0005] This invention provides a two-wire AC power line carrier LED dimming and color-tuning driving circuit, including an AC dimmer and an LED circuit, wherein the AC dimmer is used to output a dimming signal to control the LED circuit; The AC dimmer includes a zero-crossing synchronization acquisition circuit and a power supply circuit, wherein the input terminal of the zero-crossing synchronization acquisition circuit is connected to the AC power supply, and the output terminal of the power supply circuit is connected to the LED circuit. The zero-crossing synchronous acquisition circuit is used to output a low level when the input AC voltage is far from zero and to output a high level when the input AC voltage is close to zero. The power supply circuit includes a main switch circuit and a discharge circuit. The main switch circuit is used to cut off energy transmission when the AC voltage is close to zero, and the discharge circuit is used to quickly discharge the capacitors on the line.

[0006] According to the AC power carrier two-wire LED dimming and color-tuning driving circuit provided by the present invention, the main switching circuit includes a rectifier bridge, a first switching transistor, and a second switching transistor. The main switching circuit is connected to the AC power supply through the first switching transistor and to the zero-crossing synchronous acquisition circuit through the second switching transistor. When the primary side of the rectifier bridge is disconnected, the secondary side output is low, which turns off the first switching transistor and the second switching transistor. The discharge circuit includes a third switching transistor and a fourth switching transistor. The discharge circuit is connected to the main switching circuit through the third switching transistor and to the zero-crossing synchronous acquisition circuit through the fourth switching transistor. After the primary side of the rectifier bridge is energized, the secondary side output is high, which turns on the third switching transistor and the fourth switching transistor.

[0007] According to the AC power carrier two-wire LED dimming and color-tuning driving circuit provided by the present invention, the zero-crossing synchronous acquisition circuit includes a first rectifier module, a first voltage divider module, a first voltage regulator module, and a first optocoupler. The zero-crossing synchronous acquisition circuit is used to charge the capacitor through the first voltage regulator module when the input AC voltage is far from zero, and at the same time output a low level through the first photoelectric synchronous device. When the input AC voltage approaches zero, the first voltage regulator module turns on, and the zero-crossing synchronous acquisition circuit outputs a high level through the first optocoupler.

[0008] According to the AC power carrier two-wire LED dimming and color-tuning driving circuit provided by the present invention, the first voltage regulator module is a Zener diode.

[0009] The AC power carrier two-wire LED dimming and color-tuning driving circuit provided by the present invention further includes a first microcontroller; The first microcontroller is positioned between the zero-crossing synchronization acquisition circuit and the power supply circuit; The first microcontroller is used to cut off the power transmission of the power circuit when it receives a high level output from the zero-crossing synchronization acquisition circuit, and to restore the power transmission of the power circuit when it receives a low level output from the zero-crossing synchronization acquisition circuit.

[0010] According to the AC power carrier two-wire LED dimming and color-tuning driving circuit provided by the present invention, the first microcontroller is electrically connected to the first optocoupler and is used to receive the high level or low level output by the first optocoupler.

[0011] According to the AC power carrier two-wire LED dimming and color-tuning driving circuit provided by the present invention, the LED circuit includes a second rectifier module, a second voltage divider module, a second voltage regulator module, and a second optocoupler. The second rectifier module is used to rectify the input AC voltage into a swivel wave; The second optocoupler is used to output a low level when the input AC voltage is far from zero and to output a high level when the input AC voltage is close to zero.

[0012] According to the AC power carrier two-wire LED dimming and color-tuning driving circuit provided by the present invention, the LED circuit further includes a second microcontroller, which is used to receive the low level or high level output by the second optocoupler; After receiving the high level output from the second optocoupler, the second microcontroller synchronously acquires the carrier signal output from the AC dimmer.

[0013] This invention also provides a two-wire AC power line carrier LED dimming and color tuning driving method, applied to an AC dimmer, comprising: S1. After rectifying and dividing the input AC voltage, the zero-crossing window signal is obtained through the threshold comparison of the P-MOS transistor, which serves as the time reference for synchronization with the LED circuit. S2. During the zero-crossing window, the main switch circuit is turned off to cut off the power output, and the discharge circuit is turned on to quickly discharge the load line capacitor to generate a rectangular carrier signal on the power line, while the carrier signal is sent through the first optocoupler. S3. After the zero-crossing window ends, close the discharge circuit and restore the main switch circuit to conduction.

[0014] This invention also provides a two-wire AC power line carrier LED dimming and color tuning driving method, applied to LED circuits, comprising: S1. After rectifying and dividing the input AC voltage, the zero-crossing window signal is obtained by comparing the threshold of the P-MOS transistor, which serves as the time reference for synchronization with the AC dimmer. S2. During the zero-crossing window, the voltage signal is acquired, the carrier signal generated by the AC dimmer is detected, and the dimming and color adjustment command is decoded. S3. Output a PWM signal according to the decoded dimming and color adjustment command to drive a multi-channel constant current chopper circuit to adjust the power of the corresponding LED color channel to achieve dimming and color adjustment.

[0015] The AC power carrier two-wire LED dimming and color-tuning drive circuit provided by this invention accurately identifies the window moment when the AC voltage approaches zero through a zero-crossing synchronous acquisition circuit. During this window, the main switch circuit cuts off energy transmission, and the discharge circuit rapidly discharges the line capacitor, thereby generating a dimming control signal on the power line that can be recognized by the LED circuit. Dimming command transmission can be achieved without a separate signal line, perfectly compatible with the original two-core lighting circuit, and significantly reducing the wiring and construction costs of old house renovations. At the same time, since the dimming signal is generated during the window period when the main switch cuts off energy transmission, mutual interference with power transmission is avoided, improving the reliability and anti-interference capability of communication, and ensuring that the LED circuit can stably receive dimming commands and achieve precise dimming control. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the dimming and color-tuning driving circuit provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the zero-crossing synchronous acquisition loop provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the power supply circuit provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the first microcontroller provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure for detecting LED dimming carrier signals provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the second microcontroller in the LED circuit provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the four-channel chopper constant current drive circuit provided in an embodiment of the present invention; Figure 8 This is one of the flowcharts of the dimming and color-tuning driving method provided in the embodiments of the present invention; Figure 9 This is the second flowchart of the dimming and color-adjusting driving method provided in the embodiments of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0019] Figure 1 This is a schematic diagram of the dimming and color-tuning driving circuit provided in an embodiment of the present invention.

[0020] like Figure 1 As shown, this embodiment provides an AC power line carrier two-wire LED dimming and color-tuning driving circuit, including an AC dimmer and an LED circuit. The AC dimmer is used to output a dimming signal to control the LED circuit. The AC dimmer includes a zero-crossing synchronization acquisition circuit and a power supply circuit, wherein the input terminal of the zero-crossing synchronization acquisition circuit is connected to the AC power supply, and the output terminal of the power supply circuit is connected to the LED circuit. The zero-crossing synchronous acquisition circuit is used to output a low level when the input AC voltage is far from zero and to output a high level when the input AC voltage is close to zero. The power supply circuit includes a main switch circuit and a discharge circuit. The main switch circuit is used to cut off energy transmission when the AC voltage is close to zero, and the discharge circuit is used to quickly discharge the capacitors on the line.

[0021] Figure 2 This is a schematic diagram of the zero-crossing synchronous acquisition circuit provided in an embodiment of the present invention.

[0022] In practical applications, such as Figure 2 As shown, the zero-crossing synchronous acquisition circuit includes a first rectifier module, a first voltage divider module, a first voltage regulator module, and a first optocoupler; wherein the first rectifier module can be... Figure 2 In BD3, the input AC voltage is rectified into a waveform by the first rectifier module. The first voltage divider module can be R7, R8, R9, and R10. The first voltage regulator module can be the first Zener diode, i.e. Figure 2 In Q9, the first optocoupler can be Figure 2 M3 in the middle.

[0023] The zero-crossing synchronous acquisition circuit is used to charge the capacitor through the first voltage regulator module when the input AC voltage is far from zero, and at the same time output a low level through the first photoelectric synchronous device. When the input AC voltage approaches zero, the first voltage regulator module turns on, and the zero-crossing synchronous acquisition circuit outputs a high level through the first optocoupler.

[0024] Specifically, when the AC voltage is far from zero, the voltage across R10 is higher than about 38V, which charges C13 through Q9. At the same time, Q9_DS is cut off, and M3 outputs a low level. When the AC voltage approaches zero, the voltage across R10 is lower than about 16.2V, Q9 conducts, and C13, Q9, M3, and R12 form a discharge circuit, and M3 outputs a high level.

[0025] Figure 3 This is a schematic diagram of the power supply circuit provided in an embodiment of the present invention.

[0026] like Figure 3 As shown, the power supply circuit includes a main switching circuit and a discharge circuit. The main switching circuit includes a rectifier bridge, a first switching transistor, and a second switching transistor. The main switching circuit is connected to the AC power supply through the first switching transistor and to the zero-crossing synchronization acquisition circuit through the second switching transistor. When the primary side of the rectifier bridge is disconnected, the secondary side output is low, which turns off the first switching transistor and the second switching transistor. The discharge circuit includes a third switching transistor and a fourth switching transistor. The discharge circuit is connected to the main switching circuit through the third switching transistor and to the zero-crossing synchronous acquisition circuit through the fourth switching transistor. After the primary side of the rectifier bridge is energized, the secondary side output is high, which turns on the third switching transistor and the fourth switching transistor.

[0027] During implementation, such as Figure 3 As shown, the main switching circuit consists of M1, Q1, and Q2, where M1 is the rectifier bridge, Q1 is the first switching transistor, and Q2 is the second switching transistor. When the primary side of M1 is open, the secondary side output of M1 is low, which cuts off Q1 and Q2 via drive resistors R27 and R28. The discharge circuit consists of M2, Q6, Q7, R16, and R17, where Q6 is the third switching transistor and Q7 is the fourth switching transistor. When the primary side of M2 is energized, the secondary side outputs a high level, which turns on Q6 and Q7 via R140 and R144, discharging the capacitor on the load line via R16 and R17.

[0028] Figure 4 This is a schematic diagram of the structure of the first microcontroller provided in an embodiment of the present invention.

[0029] In practical applications, the AC dimmer also includes a first microcontroller, which is located between the zero-crossing synchronization acquisition circuit and the power supply circuit. The first microcontroller is electrically connected to the first optocoupler and is used to receive the high or low level output by the first optocoupler. The first microcontroller is used to cut off the power transmission of the power circuit when it receives a high level output from the zero-crossing synchronization acquisition circuit, and to restore the power transmission of the power circuit when it receives a low level output from the zero-crossing synchronization acquisition circuit.

[0030] Specifically, the first microcontroller is used to encode the dimming and color adjustment instructions into binary carrier signals. During operation, when the first microcontroller's pin 24, i.e. the input pin, detects a high level, the second pin immediately outputs 0, causing Q13 to be cut off and disconnecting the primary side of M1; at the same time, the third pin outputs 1, causing Q16 to be turned on and lighting up the LED on the primary side of M1. That is, the binary carrier signal is sent within the zero-crossing window by using the on / off state of the optocoupler M1.

[0031] Figure 5 This is a schematic diagram of the structure for detecting LED dimming carrier signals provided in an embodiment of the present invention.

[0032] In practical applications, such as Figure 5 As shown, the LED circuit includes a second rectifier module, a second voltage divider module, a second voltage regulator module, and a second optocoupler. In practice, the second rectifier module can be... Figure 5 In the BD2 module, the second voltage divider module may include R46, R47, R48 and R49, the second voltage regulator module may be a Zener diode Q7, and the second optocoupler may be M4; The second rectifier module is used to rectify the input AC voltage into a swivel wave; The second optocoupler is used to output a low level when the input AC voltage is far from zero and to output a high level when the input AC voltage is close to zero.

[0033] Figure 6 This is a schematic diagram of the structure of the second microcontroller in the LED circuit provided in an embodiment of the present invention.

[0034] like Figure 6 As shown, the LED circuit also includes a second microcontroller, namely U2, which is used to receive the low level or high level output by the second optocoupler; After receiving the high level output from the second optocoupler, the second microcontroller synchronously acquires the carrier signal output from the AC dimmer.

[0035] Specifically, when the AC voltage is far from zero, the voltage across R49 is higher than approximately 38V, charging C21 through Zener diode Q7. Simultaneously, Q7_DS is cut off, and M4 output is open, so the fifth pin of the second microcontroller detects a low level. When the AC voltage is close to zero, the voltage across R49 is lower than approximately 16.2V, Q7 conducts, and C21, Q7, M1, and R21 form a discharge circuit. M4 outputs a high level, and the fifth pin of the second microcontroller detects a high level. The second microcontroller samples the signal through the fifth pin, decodes it, and outputs the corresponding color-modulated PWM output.

[0036] Figure 7 This is a schematic diagram of the structure of the four-channel chopper constant current drive circuit provided in an embodiment of the present invention.

[0037] In practical applications, such as Figure 7 As shown, R9, Q3, R17, Q1, and R18 form the LED color 1 chopper constant current circuit; R39, Q8, R37, Q6, and R36 form the LED color 2 chopper constant current circuit; R40, Q9, R42, Q10, and R41 form the LED color 3 chopper constant current circuit; and R45, Q12, R44, Q11, and R43 form the LED color 4 chopper constant current circuit.

[0038] In summary, the AC power line carrier two-wire LED dimming and color-tuning drive circuit provided in this application accurately identifies the window moment when the AC voltage approaches zero through a zero-crossing synchronous acquisition circuit. During this window, the main switch circuit cuts off energy transmission, and the discharge circuit rapidly discharges the line capacitor, thereby generating a dimming control signal on the power line that can be recognized by the LED circuit. Dimming commands can be transmitted without a separate signal line, perfectly compatible with existing two-core lighting circuits, and significantly reducing the wiring and construction costs of old house renovations. At the same time, since the dimming signal is generated during the window period when the main switch cuts off energy transmission, mutual interference with power transmission is avoided, improving the reliability and anti-interference capability of communication, and ensuring that the LED circuit can stably receive dimming commands and achieve precise dimming control.

[0039] In the exemplary embodiment, a comparative test between the solution of this application and the prior art solution is also provided. The test grid parameters used in the comparative test are as follows: the input is a standard AC 220V voltage, superimposed with 15% third harmonic voltage distortion (THDV, total harmonic distortion), and the voltage fluctuates dynamically by ±5% within 5 seconds; the load is 100 25W capacitive LEDs driven in parallel, with a total power of 2500W.

[0040] The experimental results are shown in Table 1 below: Table 1 Comparison of Experimental Results

[0041] As can be seen, the solution provided in this application is low-cost, perfectly compatible with existing two-core lighting circuits, significantly reduces the wiring and construction costs of old house renovations, supports multi-color lighting, is flicker-free throughout, and has strong long-distance transmission stability.

[0042] The following describes the AC power carrier two-wire LED dimming and color-tuning driving method provided by the present invention. The AC power carrier two-wire LED dimming and color-tuning driving method described below can be referred to in correspondence with the AC power carrier two-wire LED dimming and color-tuning driving circuit described above.

[0043] Figure 8 This is one of the flowcharts of the dimming and color-adjusting driving method provided in the embodiments of the present invention.

[0044] Figure 9 This is the second flowchart of the dimming and color-adjusting driving method provided in the embodiments of the present invention.

[0045] in, Figure 8 The method shown is a driving method applied to AC dimmers. Figure 9 The method shown is a driving method applied to LED circuits.

[0046] like Figure 8 As shown, the driving method applied to AC dimmers includes: S1. After rectifying and dividing the input AC voltage, the zero-crossing window signal is obtained through the threshold comparison of the P-MOS transistor, which serves as the time reference for synchronization with the LED circuit. S2. During the zero-crossing window, the main switch circuit is turned off to cut off the power output, and the discharge circuit is turned on to quickly discharge the load line capacitor to generate a rectangular carrier signal on the power line, while the carrier signal is sent through the first optocoupler. S3. After the zero-crossing window ends, close the discharge circuit and restore the main switch circuit to conduction.

[0047] like Figure 9 As shown, the driving methods applied to LED circuits include: S1. After rectifying and dividing the input AC voltage, the zero-crossing window signal is obtained by comparing the threshold of the P-MOS transistor, which serves as the time reference for synchronization with the AC dimmer. S2. During the zero-crossing window, the voltage signal is acquired, the carrier signal generated by the AC dimmer is detected, and the dimming and color adjustment command is decoded. S3. Output a PWM signal according to the decoded dimming and color adjustment command to drive a multi-channel constant current chopper circuit to adjust the power of the corresponding LED color channel to achieve dimming and color adjustment.

[0048] above Figure 8 and Figure 9The driving methods shown are all schematics of a single loop. In actual applications, the above driving methods are executed cyclically.

[0049] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A two-wire AC power line carrier LED dimming and color-tuning drive circuit, characterized in that, It includes an AC dimmer and an LED circuit, wherein the AC dimmer is used to output a dimming signal to control the LED circuit; The AC dimmer includes a zero-crossing synchronization acquisition circuit and a power supply circuit, wherein the input terminal of the zero-crossing synchronization acquisition circuit is connected to the AC power supply, and the output terminal of the power supply circuit is connected to the LED circuit. The zero-crossing synchronous acquisition circuit is used to output a low level when the input AC voltage is far from zero and to output a high level when the input AC voltage is close to zero. The power supply circuit includes a main switch circuit and a discharge circuit. The main switch circuit is used to cut off energy transmission when the AC voltage is close to zero, and the discharge circuit is used to quickly discharge the capacitors on the line.

2. The AC power carrier two-wire LED dimming and color-tuning drive circuit according to claim 1, characterized in that, The main switching circuit includes a rectifier bridge, a first switching transistor, and a second switching transistor. The main switching circuit is connected to the AC power supply through the first switching transistor and to the zero-crossing synchronous acquisition circuit through the second switching transistor. When the primary side of the rectifier bridge is disconnected, the secondary side output is low, which turns off the first switching transistor and the second switching transistor. The discharge circuit includes a third switching transistor and a fourth switching transistor. The discharge circuit is connected to the main switching circuit through the third switching transistor and to the zero-crossing synchronous acquisition circuit through the fourth switching transistor. After the primary side of the rectifier bridge is energized, the secondary side output is high, which turns on the third switching transistor and the fourth switching transistor.

3. The AC power line carrier two-wire LED dimming and color-tuning drive circuit according to claim 1, characterized in that, The zero-crossing synchronous acquisition circuit includes a first rectifier module, a first voltage divider module, a first voltage regulator module, and a first optocoupler; The zero-crossing synchronous acquisition circuit is used to charge the capacitor through the first voltage regulator module when the input AC voltage is far from zero, and at the same time output a low level through the first photoelectric synchronous device. When the input AC voltage approaches zero, the first voltage regulator module turns on, and the zero-crossing synchronous acquisition circuit outputs a high level through the first optocoupler.

4. The AC power carrier two-wire LED dimming and color-tuning drive circuit according to claim 3, characterized in that, The first voltage regulator module is a Zener diode.

5. The AC power carrier two-wire LED dimming and color-tuning drive circuit according to claim 3, characterized in that, It also includes the first microcontroller; The first microcontroller is positioned between the zero-crossing synchronization acquisition circuit and the power supply circuit; The first microcontroller is used to cut off the power transmission of the power circuit when it receives a high level output from the zero-crossing synchronization acquisition circuit, and to restore the power transmission of the power circuit when it receives a low level output from the zero-crossing synchronization acquisition circuit.

6. The AC power carrier two-wire LED dimming and color-tuning drive circuit according to claim 5, characterized in that, The first microcontroller is electrically connected to the first optocoupler and is used to receive the high or low level output by the first optocoupler.

7. The AC power carrier two-wire LED dimming and color-tuning drive circuit according to claim 1, characterized in that, The LED circuit includes a second rectifier module, a second voltage divider module, a second voltage regulator module, and a second optocoupler; The second rectifier module is used to rectify the input AC voltage into a swivel wave; The second optocoupler is used to output a low level when the input AC voltage is far from zero and to output a high level when the input AC voltage is close to zero.

8. The AC power carrier two-wire LED dimming and color-tuning drive circuit according to claim 7, characterized in that, The LED circuit also includes a second microcontroller, which is used to receive the low or high level output by the second optocoupler; After receiving the high level output from the second optocoupler, the second microcontroller synchronously acquires the carrier signal output from the AC dimmer.

9. A two-wire AC power line carrier LED dimming and color-tuning driving method, applied to the AC dimmer in the two-wire AC power line carrier LED dimming and color-tuning driving circuit according to any one of claims 1-8, characterized in that, include: S1. After rectifying and dividing the input AC voltage, the zero-crossing window signal is obtained through the threshold comparison of the P-MOS transistor, which serves as a time reference for synchronization with the LED circuit. S2. During the zero-crossing window, the main switch circuit is turned off to cut off the power output, and the discharge circuit is turned on to quickly discharge the load line capacitor to generate a rectangular carrier signal on the power line, while the carrier signal is sent through the first optocoupler. S3. After the zero-crossing window ends, close the discharge circuit and restore the main switch circuit to conduction.

10. A two-wire AC power line carrier LED dimming and color-tuning driving method, applied to the LED circuit in the two-wire AC power line carrier LED dimming and color-tuning driving circuit according to any one of claims 1-8, characterized in that, include: S1. After rectifying and dividing the input AC voltage, the zero-crossing window signal is obtained by comparing the threshold of the P-MOS transistor, which serves as the time reference for synchronization with the AC dimmer. S2. During the zero-crossing window, the voltage signal is acquired, the carrier signal generated by the AC dimmer is detected, and the dimming and color adjustment command is decoded. S3. Output a PWM signal according to the decoded dimming and color adjustment command to drive a multi-channel constant current chopper circuit to adjust the power of the corresponding LED color channel to achieve dimming and color adjustment.

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