A lighting control circuit compatible with dimming and timing

Abstract

The present application relates to the technical field of lighting circuit, especially to a lighting control circuit compatible with dimming and timing, comprising: a second pin of a micro control chip is used for inputting a first adjustment signal; a third pin of the micro control chip is connected with a gate of a first MOS tube, and the micro control chip controls the first MOS tube to be turned on or turned off according to the current input first adjustment signal, so as to control the working time of a dimming driving device; a fourth pin of the micro control chip is connected with a terminal for inputting a second adjustment signal; a fifth pin of the micro control chip is connected with a gate of a second MOS tube, and the micro control chip controls the second MOS tube to be turned on or turned off according to the current input second adjustment signal, so as to control the output voltage of the dimming driving device. Advantageous effects: by changing the adjustment signal input to the micro control chip, the timing adjustment and the brightness adjustment of the lamp are simultaneously realized; by controlling the terminal, the linkage group control function of multiple dimming driving devices is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of lighting circuits, in particular to a lighting control circuit compatible with dimming and timing. Background Art

[0002] The most basic function of a dimming driving device is to provide constant current driving, and it is a device that changes the brightness of a lamp by changing the output current or output voltage of a lighting power supply (including changing the output port voltage of the dimming driving device). In the prior art, a dimming driver generally adjusts the brightness of a lamp by arranging a resistor or a dimming controller (such as pulse width modulation PWM or digital addressable lighting interface DALI) at a dimming output port. However, in some special lighting application scenarios, such as aquaculture and energy-saving lighting, it is necessary to realize timing and dimming for lamps at the same time, and the dimming driving devices in the prior art cannot simultaneously control the working time and brightness of lamps; in addition, the linkage function cannot be realized either. Summary of the Invention

[0003] Aiming at the above-mentioned problems existing in the prior art, a lighting control circuit compatible with dimming and timing is provided.

[0004] The specific technical solution is as follows:

[0005] The present invention provides a lighting control circuit compatible with dimming and timing, comprising a dimming driving device, wherein the dimming driving device comprises a first driving port, a second driving port and a third driving port, and the lighting control circuit comprises:

[0006] a first control branch connected between the first driving port and a ground terminal, and configured to selectively form a plurality of different first adjustment signals;

[0007] a second control branch connected between the first driving port and the ground terminal, and configured to selectively form a plurality of different second adjustment signals;

[0008] a micro control chip, wherein the micro control chip comprises a plurality of pins:

[0009] a first pin of the micro control chip is connected to the first driving port and configured to supply power to the micro control chip;

[0010] a second pin of the micro control chip is connected to the first control branch and configured to input the first adjustment signal to the micro control chip;

[0011] The third pin of the microcontroller chip is connected to the gate of a first MOS transistor, the drain of the first MOS transistor is connected to the second driving port, and the source of the first MOS transistor is connected to the third driving port. The microcontroller chip controls the first MOS transistor to be turned on or off according to the currently input first adjustment signal, so as to control the working time of the dimming drive device.

[0012] The fourth pin of the microcontroller chip is connected to the second control branch and is used to input the second adjustment signal to the microcontroller chip;

[0013] The fifth pin of the microcontroller chip is connected to the gate of a second MOS transistor, the drain of the second MOS transistor is connected to the second driving port, and the source of the second MOS transistor is connected to the third driving port. The microcontroller chip controls the second MOS transistor to turn on or off according to the currently input second adjustment signal, so as to control the output voltage of the dimming drive device.

[0014] Preferably, the lighting control circuit further includes a control terminal, the output of which is connected to the sixth, seventh and eighth pins of the microcontroller chip, respectively, for inputting a third control signal to the microcontroller chip, and the microcontroller chip controlling the first MOSFET and / or the second MOSFET to turn on or off according to the third control signal.

[0015] Preferably, the ninth pin of the microcontroller chip is connected to the second drive port and is used to detect the output voltage of the second drive port.

[0016] Preferably, the lighting control circuit further includes a first voltage divider unit, the first voltage divider unit comprising:

[0017] A first resistor and a second resistor are connected in series between the first drive port and the ground terminal;

[0018] A first fulcrum is provided between the first resistor and the second resistor, and the first pin of the microcontroller chip is connected to the first drive port through the first fulcrum.

[0019] Preferably, the lighting control circuit further includes a second voltage divider unit, the second voltage divider unit comprising:

[0020] A third resistor and a fourth resistor are connected in series between the power input terminal of the dimming drive device and the second drive port;

[0021] A second fulcrum is provided between the third resistor and the fourth resistor, and the drain of the first MOS transistor is connected to the second drive port through the second fulcrum and the fourth resistor.

[0022] Preferably, the first control branch includes:

[0023] A first selector switch is provided, one end of which is connected to the first drive port via a fifth resistor, and the other end of which can be selectively connected to a sixth resistor, a seventh resistor, and an eighth resistor, wherein the resistance values ​​of the sixth resistor, the seventh resistor, and the eighth resistor are different from each other.

[0024] Preferably, the second control branch includes:

[0025] A second selector switch is provided, one end of which is connected to the first drive port via a ninth resistor, and the other end of which can be selectively connected to a tenth resistor, an eleventh resistor, and a twelfth resistor, wherein the resistance values ​​of the tenth resistor, the eleventh resistor, and the twelfth resistor are different from each other.

[0026] Preferably, the lighting control circuit further includes a first capacitor connected between the first pin of the microcontroller chip and the ground terminal.

[0027] Preferably, the lighting control circuit further includes a second capacitor connected between the second drive port and the ground terminal.

[0028] Preferably, the microcontroller chip further includes a clock controller, which is disposed within the microcontroller chip and used for timing.

[0029] The technical solution of the present invention has the following advantages or beneficial effects: it provides a lighting control circuit that is compatible with dimming and timing. By changing the adjustment signal input to the microcontroller chip, the output signal of the microcontroller chip is adjusted, thereby controlling the start and stop time of the dimming drive device to achieve timed lighting; at the same time, the output voltage of the microcontroller chip controls the dimming drive device to adjust the brightness of the lamp; in addition, the control terminal can send external control signals to the microcontroller chips of multiple dimming drive devices simultaneously to achieve linkage group control function. Attached Figure Description

[0030] Embodiments of the invention will be described more fully with reference to the accompanying drawings. However, the drawings are for illustration and explanation only and do not constitute a limitation on the scope of the invention.

[0031] Figure 1 This is a structural diagram of the lighting control circuit in an embodiment of the present invention. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0035] This invention includes a lighting control circuit compatible with dimming and timing, comprising a dimming drive device 1, which includes a first drive port 11, a second drive port 12, and a third drive port 13, as shown below. Figure 1 As shown, the lighting control circuit includes:

[0036] A first control branch is connected between the first drive port 11 and the ground terminal GND, and is used to selectively generate a variety of different first adjustment signals;

[0037] A second control branch is connected between the first drive port 11 and the ground terminal GND, and is used to selectively generate a variety of different second adjustment signals;

[0038] A microcontroller chip (MCU) includes a plurality of pins:

[0039] The first pin S1 of the microcontroller chip is connected to the first drive port 11 and is used to power the microcontroller chip.

[0040] The second pin S2 of the microcontroller chip is connected to the first control branch and is used to input the first adjustment signal to the microcontroller chip;

[0041] The third pin S3 of the microcontroller chip is connected to the gate of a first MOSFET Q1, the drain of the first MOSFET Q1 is connected to the second drive port 12, and the source of the first MOSFET is connected to the third drive port 13. The microcontroller chip controls the first MOSFET Q1 to be turned on or off according to the currently input first adjustment signal, so as to control the working time of the dimming drive device 1.

[0042] The fourth pin S4 of the microcontroller chip is connected to the second control branch and is used to input the second adjustment signal to the microcontroller chip;

[0043] The fifth pin S5 of the microcontroller chip is connected to the gate of a second MOSFET Q2. The drain of the second MOSFET Q2 is connected to the second drive port 12, and the source of the second MOSFET is connected to the third drive port 13. The microcontroller chip controls the second MOSFET Q2 to be turned on or off according to the currently input second adjustment signal, so as to control the output voltage of the dimming drive device 1.

[0044] Specifically, in this embodiment, the first control branch can optionally generate multiple different voltage signals, namely the first adjustment signal. The microcontroller chip MCU adjusts the output signal on the third pin S3 according to the first adjustment signal currently input to the S2 pin, and uses the output signal of the S3 pin to control the conduction or cutoff of the first MOS transistor Q1 to control the working time of the dimming drive device 1. At the same time, the microcontroller chip MCU adjusts the output signal on the fifth pin S5 according to the second adjustment signal currently input to the S4 pin to control the output voltage of the dimming drive device 1, thereby realizing the adjustment of the brightness of the lamp.

[0045] Through the above technical solution, the lighting control circuit in this embodiment can be used for plant lighting. For example, a certain plant needs to be irradiated with light intensity A for 8 hours (h) each day during its cultivation, and then irradiated with light intensity B for 2 hours. In this embodiment, the first adjustment signal and the second adjustment signal input to the MCU can be changed through the first control branch or the second control branch. The MCU controls the working time according to different first adjustment signals. For example, if the first adjustment signal is a 5V voltage signal, and the control program sets the control time corresponding to the 5V voltage signal to 8 hours, then after the dimming drive device continuously outputs 5V voltage to the drive port to reach the control time of 8 hours, the MCU sends a high duty cycle output signal to Q1 or Q2. Q1 or Q2 is turned on, and the second drive port 12 and the third drive port 13 are short-circuited. At this time, there is no voltage input to the lamp power supply, the lamp is turned off, and timed lighting is achieved.

[0046] Specifically, in this embodiment, the dimming driver 1 is preferably a dimming driver connected to a lamp. The port voltage of the first drive port 11 can be either the Aux or program port voltage, but this port voltage must be greater than the power supply voltage of the microcontroller chip (MCU). The port voltage of the first drive port 11 is preferably 12V, and the port voltage of the second drive port 12 is preferably 10V. The second drive port 12 and the third drive port 13 are also connected to the positive and negative terminals of the dimming port of the dimming driver 1, respectively.

[0047] Specifically, the first pin S1 of the microcontroller chip MCU is a power supply pin, used to introduce the port voltage output from the first drive port 11 into the microcontroller chip MCU to power the microcontroller chip MCU; the second pin S2 of the microcontroller chip MCU is a first input pin, and S4 is a second input pin. According to the different voltage signals input to S2 and S4, the output signals with different duty cycles of S3 and S5 are controlled to control the conduction or cutoff of Q1 and Q2, thereby realizing the simultaneous adjustment of the working time and brightness of the lamp.

[0048] Specifically, when the voltage on the second drive port 12 is less than or equal to the first voltage threshold of the dimming drive device 1, a high level is sent to the first MOSFET Q1 through the S3 pin or to the second MOSFET Q2 through the S5 pin, putting it in the conducting state. At this time, the drive ports 12 and 13 of the dimming drive device 1 are equivalent to a short circuit, thereby putting the lamp at minimum brightness or the dimming driver at minimum current output. When the voltage on the second drive port 12 is lower than a second voltage threshold or the control time corresponding to different voltage signals input to the microcontroller chip MCU is reached, the source and drain of the second MOSFET Q2 are turned on, the drive ports 12 and 13 are short-circuited, and the lamp power is turned off. When the voltage on the second drive port 12 is higher than a third voltage threshold, the drive ports 12 and 13 of the dimming drive device 1 are driven normally, and the lamp is lit. The second voltage threshold is preferably 0.6V, and the third voltage threshold is preferably 0.8V.

[0049] In a preferred embodiment, the microcontroller chip (MCU) has a built-in clock controller for timing. Within the MCU, a pre-set control program determines when the lamp's operating time at the current control voltage reaches the control time. The MCU then generates a high duty cycle output signal to MOSFET Q1 or Q2, causing the output voltage at the second drive port 12 to fall below the first voltage threshold of the dimming drive device 1. At this point, the dimming drive device 1 cannot drive the lamp power supply, thus turning off the lamp power and achieving timed lighting. For example, if the control time is 24 hours, when the dimming drive device's operating time reaches 24 hours, the MCU control program generates a high duty cycle output signal to Q1 or Q2, preventing the dimming drive device 1 from driving the lamp power supply, and turning off the lamp power supply. In another embodiment, the control program can also output a short-duration switching output signal, such as a 1-minute on / 1-minute off switch. When the control time reaches 1 minute, the lamp power supply's on / off state switches. If the dimming drive device 1 has the function of dimming to the lowest level or turning off, when the control time corresponding to the input voltage is reached, the control program generates an output signal and sends it to the gate of the first MOS transistor Q1. At this time, the first MOS transistor Q1 is turned on, and the second drive port 12 and the third output port 13 are in a short circuit state. At this time, there is no voltage input to the lamp power supply, so the lamp is turned off, realizing timed lighting.

[0050] In a preferred embodiment, such as Figure 1 As shown, the lighting control circuit also includes a control terminal 2. The output terminals of the control terminal 2 are respectively connected to the sixth pin S6, the seventh pin S7 and the eighth pin S8 of the microcontroller chip, and are used to input a third control signal to the microcontroller chip MCU. The microcontroller chip MCU controls the first MOSFET Q1 and / or the second MOSFET Q2 to turn on or off according to the third control signal.

[0051] Specifically, in this embodiment, the microcontroller chip (MCU) further includes a sixth pin (S6), a seventh pin (S7), and an eighth pin (S8). Pins S6, S7, and S8 are all connected to an external control terminal. The MCU can also adjust the output signal on the third pin (S3) and the output voltage on the fifth pin (S5) according to the control commands (daisy chain) sent to it by the control terminal, thereby realizing the timing and brightness adjustment functions of the lamps. It should be noted that the control terminal 2 can be a computer, a mobile phone, a tablet computer, or other devices capable of sending control commands. When multiple dimming drive devices 1 need to provide timed lighting at the same time, the same control command can be sent from the control terminal 2 to the S6, S7, and S8 pins of multiple different microcontroller chips (MCUs), thereby achieving coordinated control of multiple dimming drive devices 1 to simultaneously adjust the brightness and timing of multiple lamps.

[0052] In a preferred embodiment, such as Figure 1 As shown, pin S9 of the microcontroller chip MCU is connected to the second drive port 12 and is used to detect the output voltage of the second drive port 12.

[0053] Specifically, after the microcontroller chip (MCU) is powered on, if the MCU outputs a signal with the maximum duty cycle through its third pin S3, or if the voltage on the second drive port 12 of the dimming driver 1 is detected to be less than or equal to the first voltage threshold of the dimming driver 1 through its ninth pin S9, a high-level signal is sent to the first MOSFET Q1 through the S3 pin or to the second MOSFET Q2 through the S5 pin, putting them in a conducting state. At this time, the drive port of the dimming driver 1 is equivalent to or close to a short circuit, thereby putting the lamp at its minimum brightness or the dimming driver at its minimum current output state. If this dimming driver has the function of dimming to the minimum level until it is turned off, the lamp is in an off state. The first voltage threshold is preferably 1V, but it can also be set to a lower voltage.

[0054] Furthermore, after the microcontroller chip MCU is powered on, if the output of the MCU's S3 pin is not the output signal with the maximum duty cycle, when the S9 pin detects that the voltage on the second drive port 12 of the dimming drive device 1 is greater than or equal to the first voltage threshold of the dimming drive device 1, a low level is sent to the second MOS transistor Q2 through the fifth pin S5 to turn it off. At this time, the second drive port 12 and the third drive port 13 of the dimming drive device 1 allow the output current to be in a linearly changing output state.

[0055] In a preferred embodiment, such as Figure 1 As shown, the lighting control circuit also includes a first voltage divider unit, which includes:

[0056] A first resistor R1 and a second resistor R2 are connected in series between the first drive port 11 and the ground terminal GND.

[0057] A first fulcrum F1 is set between the first resistor R1 and the second resistor R2, and the first pin of the microcontroller chip MCU is connected to the first drive port 11 through the first fulcrum F1.

[0058] Specifically, in this embodiment, the first voltage divider unit is a voltage divider circuit composed of a first resistor R1 and a second resistor R2 connected in series. By setting the first voltage divider unit, the voltage input to the first pin S1 of the MCU is divided, so as to avoid the input voltage of the S1 pin being too large and causing damage to the S1 pin.

[0059] In a preferred embodiment, such as Figure 1 As shown, the lighting control circuit also includes a second voltage divider unit, which includes:

[0060] A third resistor R3 and a fourth resistor R4 are connected in series between the power input terminal VCC and the second drive port 12 of the dimming drive device 1.

[0061] A second fulcrum F2 is set between the third resistor R3 and the fourth resistor R4. The drain of the first MOSFET Q1 is connected to the second drive port 12 through the second fulcrum F2 and the fourth resistor R4.

[0062] Specifically, the second voltage divider unit is composed of a third resistor R3 and a fourth resistor R4 connected in series. R3 and R4 serve as voltage dividers to prevent the MCU from directly outputting excessive current to the gate of the first MOSFET Q1, which could damage the first MOSFET Q1 and thus provide current limiting protection.

[0063] In a preferred embodiment, such as Figure 1 As shown, the first control branch includes:

[0064] A first selector switch SW1 is provided. One end of the first selector switch SW1 is connected to the first drive port 11 through a fifth resistor R5. The other end of the first selector switch SW1 can be selectively connected to a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8, and the resistance values ​​of the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 are different from each other.

[0065] Specifically, in this embodiment, a selection switch is preferably used. The first selection switch SW1 includes multiple nodes. When SW1 is connected to different nodes, resistors of different resistance values ​​are connected, forming different voltage divider circuits, thereby generating different voltage signals. For example, when SW1 is connected to R6, the S2 pin of the MCU receives the voltage signal generated by the voltage divider between R5 and R6; when SW1 is connected to R7, the S2 pin of the MCU receives the voltage signal generated by the voltage divider between R5 and R7; when SW1 is connected to R8, the S2 pin of the MCU receives the voltage signal generated by the voltage divider between R5 and R8. Since the resistance values ​​of R6, R7, and R8 are different, the voltage signals generated are also different. The MCU outputs a corresponding duty cycle according to the different voltage signals to control the conduction time of the first MOSFET Q1, thereby controlling the working time of the dimming drive device.

[0066] It should be noted that the selection switch is only a preferred embodiment of the present invention. DIP switches or sliding rheostats can also be used. The voltage signal generated by the second control branch can be adjusted by the sliding rheostat to achieve stepless dimming of the lamp power supply from 0 to 100. Alternatively, other devices that can change the resistance value can be used to change the resistance value connected in series with the fifth resistor R5, thereby forming different voltage division signals, i.e., different first adjustment signals. The voltage can also be obtained by analog or digital signal processing and input to the MCU.

[0067] In a preferred embodiment, such as Figure 1 As shown, the second control branch includes:

[0068] A second selector switch SW2 is provided. One end of the second selector switch SW2 is connected to the first drive port 11 through a ninth resistor R9. The other end of the second selector switch SW2 can be selectively connected to a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12, and the resistance values ​​of the tenth resistor R10, the eleventh resistor R11, and the twelfth resistor R12 are different from each other.

[0069] Specifically, in this embodiment, a selection switch is preferably used. The second selection switch SW2 includes multiple nodes. When SW2 is connected to different nodes, resistors of different resistance values ​​are connected to form different voltage divider circuits, thereby generating different voltage signals. For example, when SW2 is connected to R10, the voltage signal input to the S4 pin of the MCU is generated by the voltage divider of R9 and R10; when SW2 is connected to R11, the voltage signal input to the S2 pin of the MCU is generated by the voltage divider of R9 and R11; when SW2 is connected to R12, the voltage signal input to the S2 pin of the MCU is generated by the voltage divider of R9 and R12. Since the resistance values ​​of R10, R11, and R12 are different, the voltage signals generated are also different. The MCU outputs a corresponding duty cycle according to the different voltage signals to control the conduction time of the second MOSFET Q2, thereby controlling the brightness of the dimming drive device.

[0070] It should be noted that the use of a selection switch in the second control branch is only a preferred embodiment of the present invention. DIP switches or sliding rheostats can also be used. The voltage signal generated by the second control branch can be adjusted by the sliding rheostat to achieve stepless dimming of the lamp power supply from 0 to 100. Alternatively, other devices that can change the resistance value can be used to change the resistance value connected in series with the ninth resistor R9, thereby forming different voltage division signals, i.e., different second adjustment signals. The voltage can also be obtained by analog or digital signal processing and input to the MCU.

[0071] In a preferred embodiment, such as Figure 1 As shown, the lighting control circuit also includes a first capacitor C1, connected between the first pin S1 of the microcontroller chip MCU and the ground terminal GND. By setting the first capacitor C1, the voltage output to the first pin S1 of the microcontroller chip MCU is rectified and filtered to ensure the stability of the input signal.

[0072] In a preferred embodiment, such as Figure 1 As shown, the lighting control circuit also includes a second capacitor C2, connected between the second drive port 12 and the ground terminal GND. The output signal of the microcontroller chip MCU is a pulse width modulation signal (PWM). By setting the second capacitor C2, the PWM signal is rectified to obtain a stable DC voltage output signal, which is then output to the second drive port 12 and the third drive port 13 to ensure the stability of the port voltages on the second drive port 12 and the third drive port 13.

[0073] The beneficial effects of this invention are as follows: It provides a lighting control circuit that is compatible with dimming and timing. By changing the adjustment signal input to the microcontroller chip, the output signal of the microcontroller chip is adjusted, thereby controlling the start and stop time of the dimming drive device to achieve timed lighting. At the same time, the output voltage of the microcontroller chip controls the dimming drive device to adjust the brightness of the lamp. In addition, the control terminal can send external control signals to the microcontroller chips of multiple dimming drive devices at the same time to realize the linkage group control function.

[0074] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A lighting control circuit compatible with dimming and timing, comprising a dimming drive device, said dimming drive device including a first drive port, a second drive port and a third drive port, characterized in that, The lighting control circuit includes: A first control branch is connected between the first drive port and the ground terminal, and is used to selectively generate a variety of different first adjustment signals; A second control branch is connected between the first drive port and the ground terminal, and is used to selectively generate a variety of different second adjustment signals; A microcontroller chip, the microcontroller chip including a plurality of pins: The first pin of the microcontroller chip is connected to the first drive port and is used to power the microcontroller chip. The second pin of the microcontroller chip is connected to the first control branch and is used to input the first adjustment signal into the microcontroller chip; The third pin of the microcontroller chip is connected to the gate of a first MOS transistor, the drain of the first MOS transistor is connected to the second driving port, and the source of the first MOS transistor is connected to the third driving port. The microcontroller chip controls the first MOS transistor to be turned on or off according to the currently input first adjustment signal, so as to control the working time of the dimming drive device. The fourth pin of the microcontroller chip is connected to the second control branch and is used to input the second adjustment signal to the microcontroller chip; The fifth pin of the microcontroller chip is connected to the gate of a second MOSFET, the drain of the second MOSFET is connected to the second driving port, and the source of the second MOSFET is connected to the third driving port. The microcontroller chip controls the second MOSFET to turn on or off according to the currently input second adjustment signal, thereby controlling the output voltage of the dimming drive device. The lighting control circuit also includes a control terminal, the output of which is connected to the sixth, seventh, and eighth pins of the microcontroller chips of the multiple dimming drive devices, respectively, for inputting a third control signal to the microcontroller chips of each dimming drive device. The microcontroller chips control the first MOSFET and / or the second MOSFET to turn on or off according to the third control signal.

2. The lighting control circuit according to claim 1, characterized in that, The ninth pin of the microcontroller chip is connected to the second drive port and is used to detect the output voltage of the second drive port.

3. The lighting control circuit according to claim 1, characterized in that, The lighting control circuit further includes a first voltage divider unit, the first voltage divider unit comprising: A first resistor and a second resistor are connected in series between the first drive port and the ground terminal; A first fulcrum is provided between the first resistor and the second resistor, and the first pin of the microcontroller chip is connected to the first drive port through the first fulcrum.

4. The lighting control circuit according to claim 1, characterized in that, The lighting control circuit further includes a second voltage divider unit, the second voltage divider unit comprising: A third resistor and a fourth resistor are connected in series between the power input terminal of the dimming drive device and the second drive port; A second fulcrum is provided between the third resistor and the fourth resistor, and the drain of the first MOS transistor is connected to the second drive port through the second fulcrum and the fourth resistor.

5. The lighting control circuit according to claim 1, characterized in that, The first control branch includes: A first selector switch is provided, one end of which is connected to the first drive port via a fifth resistor, and the other end of which can be selectively connected to a sixth resistor, a seventh resistor, and an eighth resistor, wherein the resistance values ​​of the sixth resistor, the seventh resistor, and the eighth resistor are different from each other.

6. The lighting control circuit according to claim 1, characterized in that, The second control branch includes: A second selector switch is provided, one end of which is connected to the first drive port via a ninth resistor, and the other end of which can be selectively connected to a tenth resistor, an eleventh resistor, and a twelfth resistor, wherein the resistance values ​​of the tenth resistor, the eleventh resistor, and the twelfth resistor are different from each other.

7. The lighting control circuit according to claim 1, characterized in that, The lighting control circuit also includes a first capacitor connected between the first pin of the microcontroller chip and the ground terminal.

8. The lighting control circuit according to claim 1, characterized in that, The lighting control circuit also includes a second capacitor connected between the second drive port and the ground terminal.

9. The lighting control circuit according to claim 1, characterized in that, The microcontroller chip also includes a clock controller, which is located within the microcontroller chip and used for timing.

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