Plant light supplementing system

Abstract

A plant light supplement system disclosed by the present invention comprises a power supply circuit, a constant current driving circuit, a main lamp panel, an external light bar, a knob switch control circuit and a decoding control circuit, the power supply circuit is used for converting alternating current into direct current and providing basic power for the system, and the constant current driving circuit is used for driving the external light bar to perform light supplement according to an instruction of the decoding control circuit. According to the technical scheme, current is stably output to the main lamp panel and the externally-hung lamp strip, the main lamp panel is used for providing supplementary light with the adjustable spectrum to the main lamp panel, the externally-hung lamp strip is used for providing supplementary light with the adjustable spectrum to the externally-hung lamp strip, and the knob switch control circuit is used for adjusting the total power and output of a specific channel in a multi-gear mode. According to the plant light supplementing lamp, accurate regulation and control of spectrum and power are achieved, flexible light bar expansibility and reliable electrical isolation are achieved, modular design is convenient to maintain, functionality and practicability of the plant light supplementing lamp are improved, and the plant light supplementing lamp has certain use value and popularization value.

Description

Technical Field

[0001] The present invention relates to the technical field of plant light supplementation, and in particular to a plant light supplementation system. Background Art

[0002] In modern agriculture, plant supplementary lighting plays an important role in promoting crop growth, improving yield and quality. However, existing plant supplementary lighting systems generally have the following problems or shortcomings:

[0003] 1. Inflexible spectrum adjustment: Traditional plant fill lights can usually only provide a fixed spectrum of light, and cannot be accurately adjusted according to the different growth stages and needs of crops. This limits its application effect on different crops and cannot meet the needs of modern agriculture for refined management;

[0004] 2. Insufficient power control: Most existing fill light systems lack precise power regulation functions, making it difficult to achieve subtle adjustments to light intensity, thus affecting the optimal growth environment for crops;

[0005] 3. Poor scalability of light strips: Many fill-in lights are designed as fixed structures, and users cannot freely increase or decrease the number of light strips according to the actual planting area and crop type, making it difficult to optimize the lighting coverage and intensity;

[0006] 4. Lack of or insufficient electrical isolation: Some fill light systems lack effective electrical isolation measures and are easily affected by external electromagnetic interference, resulting in unstable signal transmission and even damage to circuit components.

[0007] In summary, a plant supplementary lighting system is needed to solve the deficiencies in the prior art. Summary of the invention

[0008] In view of the deficiencies in the prior art, the present invention provides a plant lighting system to solve the above problems.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a plant light supplement system, comprising a power supply circuit, a constant current drive circuit, a main light board, an external light bar, a knob switch control circuit and a decoding control circuit, wherein the power supply circuit is used to convert alternating current into direct current to provide basic power for the system, the constant current drive circuit is used to stably output current to the main light board and the external light bar according to the instructions of the decoding control circuit, the main light board is used to provide adjustable spectrum light to the main light board, the external light bar is used to provide adjustable spectrum light to the external light bar, the knob switch control circuit is used to adjust the total power and the output of a specific channel in multiple gears, and the decoding control circuit is used to convert the control instruction into a PWM signal and coordinate the work of each module;

[0010] The output end of the power supply circuit is connected to the constant current drive circuit, the knob switch control circuit and the decoding control circuit. The output end of the constant current drive circuit is connected to the main light board and the external light bar. The external light bar is connected to the main light board. The output end of the knob switch control circuit is connected to the decoding control circuit. The output end of the decoding control circuit is connected to the constant current drive circuit. The decoding control circuit realizes precise regulation of the spectrum and power, has flexible light bar scalability and reliable electrical isolation, and the modular design is easy to maintain, which improves the functionality and practicality of the plant fill light.

[0011] Furthermore, the decoding control circuit includes a signal input module, a main control module, a power management module, a dimming output module and a digital isolation module, wherein the signal input module is used to receive an external dimming signal, the main control module is used to decode the external dimming signal and generate a dimming control instruction, the power management module is used to provide a multi-level regulated power supply for the main control module and the peripheral circuit, the dimming output module is used to output multiple PWM signals according to the dimming control instruction to drive the corresponding light board, and the digital isolation module is used to achieve electrical isolation;

[0012] The output end of the signal input module is connected to the main control module, the output end of the main control module is connected to the digital isolation module, the output end of the digital isolation module is connected to the dimming output module, the output end of the dimming output module is connected to the constant current drive circuit, and the power management module is connected to the main control module.

[0013] Furthermore, the signal input module includes a chip U1, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a diode D3, a diode D4, a diode D5 and a capacitor C6. The resistor R8, the resistor R9 and the resistor R12 are all connected to the chip U1, the diode D3 and the diode D4 are all connected to the diode D5, and the capacitor C6 is used for filtering and stabilizing the power supply voltage to ensure the normal operation of the chip U1.

[0014] Furthermore, the main control module includes a chip N2, a resistor R5, a resistor R6, a resistor R7, a resistor RD1, a capacitor C7 and a light-emitting diode LD1, the resistor R5, the resistor R6 and the resistor R7 are all connected to the chip N2, one end of the light-emitting diode LD1 is connected to the resistor RD1, the other end of the light-emitting diode LD1 is connected to the chip N2, and the capacitor C7 is used for filtering.

[0015] Furthermore, the dimming output module includes a chip N1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C3, a capacitor C4, a capacitor C5, a diode D1 and a diode D2, all of which are connected to the chip N1. The resistor R1, the resistor R2, the resistor R3 and the resistor R4 are a resistor divider network for converting an external analog signal into a level suitable for processing by the chip N1. The diode D1 is connected in series with the resistor R2, and the diode D2 is connected in series with the resistor R3. The capacitor C3 and the capacitor C5 are used for filtering and reducing high-frequency noise in the input signal. The capacitor C4 is used for filtering and stabilizing the power supply voltage to ensure the normal operation of the chip N1.

[0016] Furthermore, the power management module includes a power supply unit and a power regulation unit, and the power supply unit and the power regulation unit are connected.

[0017] Further, the power supply unit includes a chip U3, a capacitor C9, a capacitor C10, a capacitor C11 and a resistor R16, the capacitor C9 and the capacitor C10 are connected in parallel between pin 1 and pin 2 of the chip U3, the capacitor C11 is connected in parallel between pin 2 and pin 3 of the chip U3, and the resistor R16 is connected to pin 3 of the chip U3;

[0018] The power regulating unit includes an operational amplifier U2B, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a capacitor C8, a capacitor C12, a capacitor CC1, a diode D6, a diode D7 and a thermistor PTC1, one end of the thermistor PTC1 is connected to the diode D6, the other end of the thermistor PTC1 is connected to the diode D7, the capacitor C8 and the resistor R13 are connected to pin 5 of the operational amplifier U2B, the resistor R14 is connected in parallel with the capacitor CC1, and the resistor R15 and the resistor R17 are connected to pin 6 of the operational amplifier U2B.

[0019] Furthermore, the digital isolation module includes a chip UU1, a capacitor C1 and a capacitor C2, and the capacitor C1 and the capacitor C2 are used for filtering and stabilizing the power supply voltage to ensure that the chip UU1 works normally.

[0020] Furthermore, the external light bar is connected in parallel with the main light board via a plug-in interface, the external light bar includes a cold and warm light module and a UV light module, and the main light board includes a cold and warm light module and a blue light module.

[0021] Furthermore, it also includes a control screen circuit, which is used for advanced spectral recipe setting and system parameter monitoring, and the control screen circuit is communicatively connected with the knob switch control circuit.

[0022] Substantial technical effects of the present invention:

[0023] 1. In the present invention, by integrating multiple LED light sources and combining the knob switch control module and the control screen, the output spectrum can be flexibly adjusted to meet the lighting requirements of different crops at different growth stages;

[0024] 2. In the present invention, by adopting a DC-DC 4-way constant current driving circuit, the current of each group of LED light strips can be independently adjusted to ensure that each group of light strips can obtain stable and accurate current driving, thereby achieving detailed control of light intensity;

[0025] 3. In the present invention, the design of the main light panel and the external light strips allows the user to freely increase or decrease the number of light strips according to actual planting needs, thereby improving the flexibility and adaptability of the system. In addition, the digital isolation chip ensures the security and stability of signal transmission, effectively preventing the influence of external electromagnetic interference on the control system, and has certain use value and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 This is a system principle block diagram of Example 1.

[0028] Figure 2 This is a schematic diagram of the circuit structure of the signal input module of Example 1.

[0029] Figure 3 This is a schematic diagram of the circuit structure of the main control module of Example 1.

[0030] Figure 4 This is a schematic diagram of the circuit structure of the dimming output module of Example 1.

[0031] Figure 5 Schematic diagram of the circuit structure of the power supply unit of Example 1.

[0032] Figure 6 This is a schematic diagram of the circuit structure of the power regulation unit of Example 1.

[0033] Figure 7 Schematic diagram of the circuit structure of the digital isolation module of Example 1.

[0034] Figure 8 Schematic diagram of the circuit structure of the knob switch control circuit K1 of Example 2.

[0035] Fig. 9 Schematic diagram of the circuit structure of the knob switch control circuit K2 of Example 2.

[0036] Fig.10 Schematic diagram of the circuit structure of the knob switch control circuit K3 of Example 2.

[0037] Fig.11 This is a schematic diagram of the cold and warm light DC-DC circuit structure of Example 2.

[0038] Fig.12 This is a schematic diagram of the UV light DC-DC circuit structure of Example 2.

[0039] Fig.13 This is a schematic diagram of the blue light DC-DC circuit structure of Example 2. DETAILED DESCRIPTION

[0040] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

[0041] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0042] Embodiment 1:

[0043] like Figure 1 As shown, a plant light supplement system includes a power supply circuit, a constant current drive circuit, a main light board, an external light bar, a knob switch control circuit and a decoding control circuit. The power supply circuit is used to convert alternating current into direct current to provide basic power for the system. The constant current drive circuit is used to stably output current to the main light board and the external light bar according to the instructions of the decoding control circuit. The main light board is used to provide adjustable spectrum light to the main light board, and the external light bar is used to provide adjustable spectrum light to the external light bar. The knob switch control circuit is used to adjust the total power and the output of a specific channel in multiple gears. The decoding control circuit is used to convert the control instruction into a PWM signal and coordinate the work of each module.

[0044] The output end of the power supply circuit is connected to the constant current drive circuit, the knob switch control circuit and the decoding control circuit. The output end of the constant current drive circuit is connected to the main light board and the external light strip. The external light strip is connected to the main light board. The output end of the knob switch control circuit is connected to the decoding control circuit. The output end of the decoding control circuit is connected to the constant current drive circuit.

[0045] As an implementation method, the decoding control circuit includes a signal input module, a main control module, a power management module, a dimming output module and a digital isolation module, the signal input module is used to receive an external dimming signal, the main control module is used to decode the external dimming signal and generate a dimming control instruction, the power management module is used to provide a multi-level regulated power supply for the main control module and the peripheral circuit, the dimming output module is used to output multiple PWM signals according to the dimming control instruction to drive the corresponding light board, and the digital isolation module is used to achieve electrical isolation;

[0046] The output end of the signal input module is connected to the main control module, the output end of the main control module is connected to the digital isolation module, the output end of the digital isolation module is connected to the dimming output module, the output end of the dimming output module is connected to the constant current drive circuit, and the power management module is connected to the main control module;

[0047] When the system is connected to an external control panel, the spectrum information is input through the control panel circuit, the external signal is decoded by the main control module, and the signal is sent to the dimming output module through the digital isolation module. The dimming output module collects the number of light strips and outputs the dimming signal to the DC-DC driver;

[0048] When the system is not connected to an external control panel, the signal path is controlled through the knob switch, the spectral information is input to the control panel circuit, the main control module decodes the external signal, and sends the signal to the dimming output module through the digital isolation module. The dimming output module collects the number of light strips and outputs the dimming signal to the DC-DC driver.

[0049] As an implementation method, Figure 2 As shown, the signal input module includes a chip U1, resistors R8, R9, R10, R11, R12, diodes D3, D4, D5, capacitor C6, an external signal interface RJ1 and an external signal interface RJ2. Resistors R8, R9 and R12 are all connected to the chip U1, diodes D3 and D4 are all connected to diode D5, capacitor C6 is used for filtering and stabilizing the power supply voltage to ensure the normal operation of chip U1, and external signal interfaces RJ1 and RJ2 support differential signals (485A, 485B) or single-ended signal input, which are transmitted to the MCU through a digital isolation chip;

[0050] After resistors R8 and R9 are connected in series, one end is connected to the +5V power supply, and the other end is connected to pin 6 and pin 7 of the digital isolation chip U1 respectively. Resistors R10 and R11 are connected between the 485A and 485B signal lines and the ground respectively. One end of resistor R12 is connected to pin 5 of the digital isolation chip U1, and the other end is connected to the anodes of diodes D3 and D4 and the cathode of diode D5, which plays a current limiting role to prevent excessive current from damaging the circuit;

[0051] Diode D3 and diode D4 are transient voltage suppression diodes, which are connected in parallel to the 485A and 485B signal lines respectively to protect the circuit from overvoltage shocks. Their cathodes are connected to the 485A and 485B signal lines respectively, and their anodes are commonly connected to the cathode of D5; the anode of diode D5 is grounded, and the cathode is connected to the anodes of D3 and diode D4 to form a common grounding path, further enhancing the overvoltage protection capability of the circuit;

[0052] As an implementation method, Figure 3 As shown, the main control module includes a chip N2, resistors R5, R6, R7, RD1, a capacitor C7 and a light emitting diode LD1. The resistors R5, R6 and R7 are all connected to the chip N2, one end of the light emitting diode LD1 is connected to the resistor RD1, and the other end of the light emitting diode LD1 is connected to the chip N2. The capacitor C7 is used for filtering.

[0053] As an implementation method, Figure 4 As shown, the dimming output module includes a chip N1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C3, a capacitor C4, a capacitor C5, a diode D1 and a diode D2, all of which are connected to the chip N1. The resistors R1, R2, R3 and R4 are a resistor voltage divider network, which is used to convert an external analog signal into a level suitable for processing by the chip N1. The diode D1 is connected in series with the resistor R2, and the diode D2 is connected in series with the resistor R3. The capacitors C3 and C5 are used for filtering and reducing high-frequency noise in the input signal. The capacitor C4 is used for filtering and stabilizing the power supply voltage to ensure the normal operation of the chip N1.

[0054] Diode D1 and diode D2 (5.1V voltage regulator diode) are connected in series with the A1 and A2 signal lines respectively to play an overvoltage protection role to prevent the input voltage from being too high to damage the circuit;

[0055] Capacitor C3 and capacitor C5 (0.1 μF capacitor) are connected between the node of resistor R2 and resistor R4 and SGND respectively, and are used for filtering to reduce high-frequency noise in the input signal;

[0056] Light bar quantity collection part: Through A1 and A2 signal input, after resistor voltage division and voltage regulator diode protection, it is connected to the ICEDAT1 pin of the N1 chip. Capacitors C3 and C5 are used for filtering.

[0057] Dimming output part: Chip N1 outputs dimming signals through multiple PWM pins. These signals are connected to external lamps through Header 8H to achieve brightness adjustment.

[0058] As an implementation mode, the power management module includes a power supply unit and a power regulation unit, and the power supply unit and the power regulation unit are connected.

[0059] As an implementation method, Figure 5 As shown, the power supply unit includes a chip U3, capacitors C9, C10, C11 and a resistor R16, capacitors C9 and C10 are connected in parallel between pin 1 and pin 2 of the chip U3, capacitor C11 is connected in parallel between pin 2 and pin 3 of the chip U3, and resistor R16 is connected to pin 3 of the chip U3;

[0060] like Figure 6 As shown, the power regulation unit includes an operational amplifier U2B, resistors R13, R14, R15, R16, R17, capacitors C8, C12, CC1, diodes D6, D7 and thermistor PTC1, one end of the thermistor PTC1 is connected to diode D6, the other end of the thermistor PTC1 is connected to diode D7, capacitor C8 and resistor R13 are connected to pin 5 of the operational amplifier U2B, resistor R14 is connected in parallel with capacitor CC1, and resistors R15 and R17 are connected to pin 6 of the operational amplifier U2B. Resistors R15 and R17 provide a stable reference voltage for the in-phase input terminal of the operational amplifier U2B. This configuration enables the operational amplifier to perform precise signal regulation based on the input signal (voltage provided by R13) and the feedback signal (voltage division provided by R15 and R17), thereby achieving effective control of the power or other parameters in the circuit.

[0061] As an implementation method, Figure 7 As shown, the digital isolation module includes a chip UU1, a capacitor C1 and a capacitor C2. The capacitor C1 and the capacitor C2 are used for filtering and stabilizing the power supply voltage to ensure that the chip UU1 works normally.

[0062] As an implementation method, the external light bar is connected in parallel with the main light board through a plug-in interface, the external light bar includes a cold and warm light module and a UV light module, and the main light board includes a cold and warm light module and a blue light module.

[0063] As an implementation mode, it also includes a control screen circuit, which is used for advanced spectral recipe setting and system parameter monitoring, and the control screen circuit is communicatively connected with the knob switch control circuit.

[0064] Embodiment 2:

[0065] This embodiment is basically the same as Embodiment 1, except that the present application provides a power supply circuit (AC-DC power supply) connected to a constant current drive circuit (DC-DC 4-way constant current drive circuit), the power supply circuit converts AC alternating current into direct current and provides it to the constant current drive circuit, and the constant current drive circuit converts direct current into 4-way constant current and provides it to the main light panel and the external light strip.

[0066] The knob switch control circuit is connected to the decoding control circuit. The knob switch control circuit K1 (refer to the attached Figure 8 ) Control the total power, K1 has 5 adjustable levels, level 1 OFF, level 2 25%, level 3 50%, level 4 75%, level 5 100%, DC-DC1 output, DC-DC3 output, DC-DC3 output, DC-DC4 output multiplied by the percentage of K1 = actual output power;

[0067] K2 (see attached Fig. 9 ) Control DC-DC4 power, K2 has 5 adjustable levels, 1st level OFF, 2nd level 25%, 3rd level 50%, 4th level 75%, 5th level 100%, priority is higher than K3 spectrum formula, for example: K3 formula is DC-DC1 output 80%, DC-DC2 output 70%, DC-DC3 output 60%;

[0068] DC-DC4 outputs 60%, when K1 100%, K2 50%, the output is DC-DC1 output 80%, DC-DC2 output 70%, DC-DC3 output 60%, DC-DC4 output 50%;

[0069] K3 (see attached Fig.10 ) is the output spectrum formula. K3 has 5 adjustable levels. 5 spectrum formulas can be set. The formula can be customized and edited. Configure the output values ​​of DC-DC1 output, DC-DC2 output, DC-DC3 output, and DC-DC4 output to output different formulas.

[0070] For example:

[0071] Spectral formula 1: CW DC-DC1 output 100%; R DC-DC2 output 60%, B DC-DC3 output 0%, UV DC-DC4 output 10%;

[0072] Spectral formula 2CW DC-DC1 output 100%; R DC-DC2 output 100%, B DC-DC3 output 0%, UV DC-DC4 output 40%;

[0073] Spectral formula 3: CW DC-DC1 output 80%; R DC-DC2 output 100%, B DC-DC3 output 0%, UV DC-DC4 output 60%;

[0074] Spectral formula 4: CW DC-DC1 output 60%; R DC-DC2 output 100%, B DC-DC3 output 0%, UV DC-DC4 output 100%;

[0075] Spectral formula 5: CW DC-DC1 outputs 40%; R DC-DC2 outputs 100%, B DC-DC3 outputs 0%, UV DC-DC4 outputs 100% and is sent to the decoding control module circuit;

[0076] The decoding control module circuit is connected to the DC-DC 4-way constant current drive circuit. The decoding control module circuit converts the dimming signal of the knob switch control circuit into a PWM signal to the DC-DC 4-way constant current drive circuit to control the drive output of each DC-DC to achieve spectrum change control.

[0077] The decoding control module circuit is connected to the main light board and the external light bar. Figure 4 A1 in the figure is the main power lamp board detection signal, the lamp board voltage is 54V, each lamp strip has a 10MΩ resistor, multiple lamp strips are multiple 10MΩ resistors in parallel, the lamp board pull-up resistor is 1MΩ or multiple parallel connected with the detection resistor R1 (10KΩ) to divide the voltage, the voltage signal is received by the control module for detection, the calculation formula for the number of lamp strips is: lamp board voltage / (lamp board resistance+sampling resistor)*sampling resistor=1 lamp strip voltage, sampling voltage÷1 lamp strip voltage=number of main lamp strips;

[0078] Attached Figure 4 A2 in the figure is the external light bar detection signal, the light board voltage is 54V, each light bar has a 10MΩ resistor, multiple light bars are multiple 10MΩ resistors in parallel, the light board pull-up resistor is 1MΩ or multiple paralleled with the detection resistor R1 (4.7KΩ) to divide the voltage, the voltage signal is received by the control module for detection, the light bar quantity detection calculation formula: light board voltage / (light board resistance+sampling resistor)*sampling resistor=1 light bar voltage, sampling voltage÷1 light bar voltage=number of external light bars, light bar plug-in protection output power calculation: the main power light board can plug in up to 10 light bars, and the external light bar can plug in up to 20 light bars, the actual output power of the whole lamp = the actual output power of the external light bar + the actual output power of the main power light board, the actual output power of the external light bar = (formula power)÷(20 light bars)*(number of external bars), the actual output power of the main power light board = (formula power)÷(10 light bars)*(number of main light bars);

[0079] The control panel circuit is connected to the knob switch control circuit; when the control panel circuit is connected, the knob switch control circuit function fails, and the spectrum formula set by the control panel circuit is executed. The control panel circuit is connected to the knob switch control circuit through the RS485 signal, and the knob switch control circuit sends the signal to the decoding control module circuit. The decoding control module circuit converts the signal into PWM and sends it to the CDC-DC 4-way constant current drive circuit to control the 4-way DC-DC constant current drive power output.

[0080] It should be noted that the preferred embodiments of the present invention are given in the specification and drawings of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments are not intended to be additional limitations on the content of the present invention. The purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all considered to be within the scope of the present invention; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the present invention.

Claims

1. A plant supplementary lighting system, comprising a power supply circuit, a constant current drive circuit, a main light board, an external light bar, a knob switch control circuit and a decoding control circuit, wherein the power supply circuit is used to convert alternating current into direct current, the constant current drive circuit is used to output a stable current to the main light board and the external light bar according to the instructions of the decoding control circuit, and the knob switch control circuit is used to adjust the total power and the output of a specific channel in multiple gears, characterized in that: The main light board is used to provide fill light with adjustable spectrum to the main light board, the external light strip is used to provide fill light with adjustable spectrum to the external light strip, the decoding control circuit is used to convert control instructions into PWM signals and coordinate the operation of each module, the output end of the power supply circuit is connected to the constant current drive circuit, the knob switch control circuit and the decoding control circuit, the output end of the constant current drive circuit is connected to the main light board and the external light strip, the external light strip is connected to the main light board, the output end of the knob switch control circuit is connected to the decoding control circuit, and the output end of the decoding control circuit is connected to the constant current drive circuit.

2. A plant light supplement system according to claim 1, characterized in that: The decoding control circuit includes a signal input module, a main control module, a power management module, a dimming output module and a digital isolation module. The signal input module is used to receive an external dimming signal. The main control module is used to decode the external dimming signal and generate a dimming control instruction. The power management module is used to provide a multi-level regulated power supply for the main control module and the peripheral circuit. The dimming output module is used to output multiple PWM signals according to the dimming control instruction to drive the corresponding light board. The digital isolation module is used to achieve electrical isolation. The output end of the signal input module is connected to the main control module, the output end of the main control module is connected to the digital isolation module, the output end of the digital isolation module is connected to the dimming output module, the output end of the dimming output module is connected to the constant current drive circuit, and the power management module is connected to the main control module.

3. A plant light supplement system according to claim 2, characterized in that: The signal input module includes a chip U1, resistors R8, R9, R10, R11, R12, diodes D3, D4, D5 and capacitor C6. The resistors R8, R9 and R12 are all connected to the chip U1, the diodes D3 and D4 are all connected to the diode D5, and the capacitor C6 is used for filtering and stabilizing the power supply voltage to ensure the normal operation of the chip U1.

4. A plant light supplement system according to claim 3, characterized in that: The main control module includes a chip N2, a resistor R5, a resistor R6, a resistor R7, a resistor RD1, a capacitor C7 and a light-emitting diode LD1. The resistor R5, the resistor R6 and the resistor R7 are all connected to the chip N2, one end of the light-emitting diode LD1 is connected to the resistor RD1, and the other end of the light-emitting diode LD1 is connected to the chip N2. The capacitor C7 is used for filtering.

5. A plant light supplement system according to claim 4, characterized in that: The dimming output module includes a chip N1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C3, a capacitor C4, a capacitor C5, a diode D1 and a diode D2, all of which are connected to the chip N1. The resistor R1, the resistor R2, the resistor R3 and the resistor R4 are a resistor divider network, which is used to convert an external analog signal into a level suitable for processing by the chip N1. The diode D1 is connected in series with the resistor R2, and the diode D2 is connected in series with the resistor R3. The capacitor C3 and the capacitor C5 are used to filter and reduce high-frequency noise in the input signal. The capacitor C4 is used to filter and stabilize the power supply voltage to ensure the normal operation of the chip N1.

6. A plant light supplement system according to claim 5, characterized in that: The power management module includes a power supply unit and a power regulation unit, and the power supply unit and the power regulation unit are connected.

7. A plant light supplement system according to claim 6, characterized in that: The power supply unit includes a chip U3, a capacitor C9, a capacitor C10, a capacitor C11 and a resistor R16, the capacitor C9 and the capacitor C10 are connected in parallel between pin 1 and pin 2 of the chip U3, the capacitor C11 is connected in parallel between pin 2 and pin 3 of the chip U3, and the resistor R16 is connected to pin 3 of the chip U3; The power regulating unit includes an operational amplifier U2B, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a capacitor C8, a capacitor C12, a capacitor CC1, a diode D6, a diode D7 and a thermistor PTC1, one end of the thermistor PTC1 is connected to the diode D6, the other end of the thermistor PTC1 is connected to the diode D7, the capacitor C8 and the resistor R13 are connected to pin 5 of the operational amplifier U2B, the resistor R14 is connected in parallel with the capacitor CC1, and the resistor R15 and the resistor R17 are connected to pin 6 of the operational amplifier U2B.

8. A plant light supplement system according to claim 7, characterized in that: The digital isolation module includes a chip UU1, a capacitor C1 and a capacitor C2. The capacitor C1 and the capacitor C2 are used for filtering and stabilizing the power supply voltage to ensure that the chip UU1 works normally.

9. A plant light supplement system according to claim 1, characterized in that: The external light bar is connected in parallel with the main light board through a plug-in interface, the external light bar includes a cold and warm light module and a UV light module, and the main light board includes a cold and warm light module and a blue light module.

10. A plant light supplement system according to claim 1, characterized in that: It also includes a control screen circuit, which is used for advanced spectral recipe setting and system parameter monitoring, and the control screen circuit is communicatively connected with the knob switch control circuit.

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