Multi-channel constant temperature control aging car intelligent main control circuit

Abstract

The utility model discloses a kind of multi-channel constant temperature control aging car intelligent main control circuit, comprising: power supply circuit, single-chip microcontroller main control circuit, button interface circuit, 8-way temperature acquisition circuit, temperature acquisition channel switching circuit, AD conversion circuit, communication switching circuit, extension IO control interface circuit, temperature control interface circuit, AC control interface circuit, liquid crystal display circuit, three-color lamp interface circuit, 485 communication circuit and input detection extension IO circuit.The utility model can carry out multi-channel temperature measurement temperature control, realize the real-time temperature control function of most 8 aging positions, can realize host computer control and flexible control aging car AC power supply system and communication switching function, simultaneously through the various sensors of connection to realize smoke detection function or alarm control function, and realize for example three-color working state indicator light control function, aging position lock and warehouse door switch detection function, multi-layer communication cut layer function, product aging input and output impact switching function etc..

Description

Technical Field

[0001] This utility model relates to the field of electronic technology, and in particular to an intelligent main control circuit for a multi-channel constant temperature control aging vehicle. Background Technology

[0002] Current aging vehicle main control circuits are generally limited to controlling the start and stop of the aging vehicle, lacking constant temperature control functionality. If a constant temperature function is required, an additional temperature control device needs to be installed. Furthermore, a single temperature control device can typically only collect the temperature at a single point, failing to comprehensively detect the temperature conditions in all areas inside the aging vehicle, and cannot achieve compartment-by-compartment constant temperature control, i.e., multi-channel temperature control. Therefore, the main functions of current main control circuits are primarily basic instruction parsing, communication switching, and single-point temperature control, lacking special functions such as smoke and fire detection and control, expansion of other sensor interfaces, and product input / output aging impact I / O.

[0003] Therefore, there is an urgent need for a multi-channel constant temperature control intelligent main control circuit for aging vehicles. Utility Model Content

[0004] In view of the above problems, this utility model is proposed to provide a multi-channel constant temperature control aging car intelligent main control circuit that overcomes or at least partially solves the above problems.

[0005] This utility model provides a multi-channel constant temperature control aging cart intelligent main control circuit. The multi-channel constant temperature control aging cart intelligent main control circuit includes: a power supply circuit, a microcontroller main control circuit, a button interface circuit, an 8-channel temperature acquisition circuit, a temperature acquisition channel switching circuit, an AD conversion circuit, a communication switching circuit, an extended IO control interface circuit, a temperature control interface circuit, an AC control interface circuit, an LCD display circuit, a tri-color LED interface circuit, a 485 communication circuit, and an input detection extended IO circuit. The microcontroller main control circuit, button interface circuit, 8-channel temperature acquisition circuit, temperature acquisition channel switching circuit, AD conversion circuit, and communication switching circuit... The extended IO control interface circuit, temperature control interface circuit, AC control interface circuit, LCD display circuit, tri-color lamp interface circuit, 485 communication circuit, and input detection extended IO circuit are all electrically connected to the power supply circuit. The button interface circuit, temperature acquisition channel switching circuit, AD conversion circuit, communication switching circuit, extended IO control interface circuit, temperature control interface circuit, AC control interface circuit, LCD display circuit, tri-color lamp interface circuit, 485 communication circuit, and input detection extended IO circuit are all electrically connected to the microcontroller main control circuit. The 8-channel temperature acquisition circuit is electrically connected to the temperature acquisition channel switching circuit.

[0006] Optionally, the power supply circuit includes diode D2, TVS diode D3, diode D5, capacitors C1, C3, C4, C5, C6, C7, C8, and C9, a power conversion module U2, a step-down chip U5, a Zener diode U37, a resistor R12, an inductor L1, and a light-emitting diode LED1; the product model of the power conversion module U2 is B0505S-1WR3; the product model of the step-down chip U5 is XL2596S-5.0E1; the positive terminal of diode D2 is connected to two 12V power supply terminals through a wire-to-board connector, and the negative terminal of diode D2 and TVS diode D3 are connected to the 12V output terminal; pin 1 of the power conversion module U2 is connected to capacitors C1 and C3 respectively, and the pins of the power conversion module U2 are... 2. Connect the VCC power supply terminal. Pin 3 of the power conversion module U2 is connected to one end of capacitor C4, one end of capacitor C5, and GND1 respectively. Pin 4 of the power conversion module U2, the other end of capacitor C4, and the other end of capacitor C5 are connected to the 5V output terminal respectively. Pin 1 of the step-down chip U5, capacitors C7 and C8 are connected to the 12V output terminal respectively. Pin 4 of the step-down chip U5, capacitors C6 and C9, Zener diode U37, and inductor L1 are connected to the VCC power supply terminal respectively. Pin 2 of the step-down chip U5 is connected to diode D5 and inductor L1 respectively. Pins 3, 5, and 6 of the step-down chip U5 are grounded. Resistor R12 is connected to the VCC power supply terminal and the positive terminal of LED1 respectively. The negative terminal of LED1 is grounded.

[0007] Optionally, the microcontroller main control circuit includes a microcontroller U9, capacitor C18, and capacitor C19. The product model of the microcontroller U9 is STC8A8K64D4-45I-LQFP48. Pins 2-9 of the microcontroller U9 are connected to the input detection extended IO control interface circuit; pins 10, 14, and 16 of the microcontroller U9 are connected to the communication switching circuit; pins 19 and 20 of the microcontroller U9 are connected to the 485 communication circuit; and pins 21-26 of the microcontroller U9 are connected to... The button interface circuit; pins 27-29 of the microcontroller U9 are connected to the temperature control interface circuit and the AC control interface circuit; pins 31-33 of the microcontroller U9 are connected to the temperature acquisition channel switching circuit; pins 34-38 of the microcontroller U9 are connected to the AD conversion circuit; pins 39-41 of the microcontroller U9 are connected to the tri-color lamp control circuit; one end of capacitor C18 and capacitor C19 are respectively connected to the VCC power supply terminal, and the other end of capacitor C18 and capacitor C19 are grounded.

[0008] Optionally, the 8-channel temperature acquisition circuit includes 8 sets of identical and parallel temperature sensor units. Each temperature sensor unit includes a temperature sensor interface U19, resistors R28 and R36, and a reference voltage regulator IC chip U22. The product model of the temperature sensor interface U19 is KF7.62-2P. Pin 2 of the temperature sensor interface U19 and pin 1 of the reference voltage regulator IC chip U22 are respectively connected to resistor R36. Pin 1 of the temperature sensor interface U19 and pin 3 of the reference voltage regulator IC chip U22 are grounded. One end of the resistor R28 is connected to pin 2 of the reference voltage regulator IC chip U22, and the other end of the resistor R28 is connected to the VCC power supply terminal.

[0009] Optionally, the temperature acquisition channel switching circuit includes an operational amplifier U7 and an analog switch IC chip U10. The product model of the operational amplifier U7 is LM258DR, and the product model of the analog switch IC chip U10 is CD4051BM / TR. Pins 9-11 of the analog switch IC chip U10 are connected to the microcontroller main control circuit. Pins 1, 2, 4-5, and 12-15 of the analog switch IC chip U10 are connected to the 8-channel temperature acquisition circuit. Pin 3 of the analog switch IC chip U10 is connected to resistor R13 and then through resistor R14 to the operational amplifier U7. Pin 2 of the operational amplifier U7 is connected to the feedback resistor R9. Pin 1 of the operational amplifier U7 is connected to resistor R10. Pin 16 of the analog switch IC chip U10 is connected to the VCC power supply terminal. Pin 8 of the analog switch IC chip U10 is connected to the GND terminal. Pin 8 of the operational amplifier U7 is connected to the VCC power supply terminal, and pin 4 of the operational amplifier U7 is connected to the GND terminal.

[0010] Optionally, the AD conversion circuit includes an analog-to-digital converter chip U6, a voltage reference chip U8, a crystal oscillator X1, resistors R11 and R15, and a filter capacitor C15. The product model of the analog-to-digital converter chip U6 is TM7707, and the product model of the voltage reference chip U8 is LM285D-2-5. Pins 5, 12, 13, and 14 of the analog-to-digital converter chip U6 are connected to the microcontroller main control circuit. Pin 9 of the analog-to-digital converter chip U6 is connected to pin 8 of the voltage reference chip U8. Pins 2 and 3 of the analog-to-digital converter chip U6 are connected to the crystal oscillator X1 and resistor R11, respectively. Pins 15 and 16 of the analog-to-digital converter chip U6 are connected to the VCC terminal and the GND terminal, respectively. Pin 8 of the voltage reference chip U8 is connected to the VCC terminal through resistor R15, and pin 4 of the voltage reference chip U8 and the filter capacitor C15 are connected to the GND terminal, respectively.

[0011] Optionally, the communication switching circuit includes eight relays K2-K9, an eight-layer communication interface, a Darlington transistor driver IC chip U13, a serial-to-parallel converter IC chip U16, a serial-to-parallel converter IC chip U17, and a Darlington transistor driver IC chip U18. The product models of Darlington transistor driver IC chips U13 and U18 are ULN2803A, and the product models of serial-to-parallel converter IC chips U16 and U17 are 74HC595D. The extended IO control interface circuit includes an extended IO interface AC3, the product model of which is PZ254V-12-10P. The eight relays K2-K9 are respectively connected to the Darlington transistor driver IC... Chip U13 is electrically connected. The eight relays K2-K9 are double-pole double-throw relays. The common terminal of the eight relays K2-K9 is connected to the 485 communication circuit. The normally open contacts of the eight relays K2-K9 are respectively connected to the communication interface of layer 8. The serial-to-parallel IC chip U16 and serial-to-parallel IC chip U17 are electrically connected to the microcontroller main control circuit. Specifically, the serial-to-parallel IC chip U16 is electrically connected to the Darlington transistor driver IC chip U18, the serial-to-parallel IC chip U17 is electrically connected to the extended I / O interface AC3, and the Darlington transistor driver IC chip U18 is electrically connected to the extended I / O interface AC3. The temperature control interface circuit includes a Darlington transistor driver IC chip U11, a serial-to-parallel converter IC chip U12, and an AC control interface AC1. The AC control interface circuit includes a serial-to-parallel converter IC chip U14, a Darlington transistor driver IC chip U15, and an AC control interface AC2. The product models of Darlington transistor driver IC chips U11 and U15 are ULN2803A, the product models of serial-to-parallel converter IC chips U12 and U14 are 74HC595D, and the product models of AC control interfaces AC1 and AC control interfaces AC2 are PZ254V-12-10P. The serial-to-parallel converter IC chips U12 and U14 are electrically connected to the microcontroller's main control circuit, and the Darlington transistor driver IC chip U11 is electrically connected to both the serial-to-parallel converter IC chip U12 and the AC control interface AC1. Chip U15 is electrically connected to the serial-to-parallel IC chip U14 and the AC control interface AC2.

[0012] Optionally, the liquid crystal display circuit includes an LCD display screen, a resistor R20, a transistor Q4, and a potentiometer R23; pin 1 of the LCD display screen is connected to the collector of the transistor Q4, and the base of the transistor Q4 is connected to the microcontroller main control circuit through the resistor R20; pins 3-7 and 9 of the LCD display screen are connected to the microcontroller main control circuit; pin 10 of the LCD display screen is connected to potentiometer R23; pins 8 and 12 of the LCD display screen are respectively connected to the GND terminal, and pins 2 and 11 of the LCD display screen are respectively connected to the VCC power supply terminal.

[0013] Optionally, the tri-color lamp interface circuit includes a tri-color lamp interface H1 and three sets of parallel relay switch units. The product model of the tri-color lamp interface H1 is VH3.96-4P ZZ. The three sets of relay switch units are respectively connected to pins 1-3 of the tri-color lamp interface H1 and the microcontroller main control circuit.

[0014] Optionally, the 485 communication circuit includes an optocoupler U1, an optocoupler U4, a communication IC chip U3, and a 485 signal communication interface. The product model of the communication IC chip U3 is SN65LBC184DR. The communication IC chip U3 is electrically connected to the optocoupler U1, the optocoupler U4, and the 485 signal communication interface. The optocoupler U1 and the optocoupler U4 are electrically connected to the single-chip main control circuit.

[0015] The technical solution provided in this embodiment of the utility model has at least the following technical effects or advantages: The multi-channel constant temperature control aging cart intelligent main control circuit described in this embodiment of the utility model can perform multi-channel temperature measurement and control through the single-chip microcomputer main control circuit, and can realize the real-time temperature control function of up to 8 aging compartments. The temperature data can be displayed on the screen through the LCD display circuit, and uploaded to the upper computer software PC terminal for display and storage of aging data reports through the 485 communication circuit. The single-chip microcomputer main control circuit can realize upper computer control and flexible control of the AC power supply system and communication switching function of the aging cart. At the same time, it can realize smoke detection function or alarm control function through various connected sensors, realize the three-color working status indicator control function based on the three-color light interface circuit, and realize aging compartment lock and door opening and closing detection function, multi-layer communication layer cutting function, product aging input and output impact switching function, etc. Through multi-channel switching, the multi-functional control of the aging cart main control is realized.

[0016] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the principle structure of the intelligent main control circuit of the multi-channel constant temperature control aging car described in this utility model; Figure 2 This is a reference circuit diagram for the power supply circuit; Figure 3 This is a reference circuit diagram for the microcontroller's main control circuit. Figure 4 This is a reference circuit diagram for the button interface circuit; Figure 5 This is a reference circuit diagram for an 8-channel temperature acquisition circuit; Figure 6 This is a reference circuit diagram for the temperature acquisition channel switching circuit; Figure 7 This is a reference circuit diagram for an AD conversion circuit; Figure 8a A schematic diagram of the first reference circuit for the communication switching circuit and the extended IO control interface circuit; Figure 8b This is a schematic diagram of a second reference circuit for the communication switching circuit and the extended IO control interface circuit. Figure 9 This is a reference circuit diagram for the temperature control interface circuit and the AC control interface circuit; Figure 10 This is a reference circuit diagram for a liquid crystal display circuit. Figure 11 This is a reference circuit diagram for the tri-color LED interface circuit; Figure 12 This is a reference circuit diagram for the 485 communication circuit. Figure 13 A reference circuit diagram for an extended I / O circuit for input detection.

[0019] Explanation of reference numerals in the attached figures: 1. Power supply circuit; 2. Microcontroller main control circuit; 3. Button interface circuit; 4. 8-channel temperature acquisition circuit; 5. Temperature acquisition channel switching circuit; 6. AD conversion circuit; 7. Communication switching circuit; 8. Extended IO control interface circuit; 9. Temperature control interface circuit; 10. AC control interface circuit; 11. LCD display circuit; 12. Three-color LED interface circuit; 13. 485 communication circuit; 14. Input detection extended IO circuit. Detailed Implementation

[0020] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings.

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The accompanying drawings show preferred embodiments of the present invention. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0022] Unless otherwise specified, all raw materials, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0023] Figure 1 This is a schematic diagram of the principle structure of a multi-channel constant temperature control aging cart intelligent main control circuit provided by an embodiment of this utility model. (See attached diagram.) Figure 1As shown, the intelligent main control circuit of the multi-channel constant temperature control aging car includes a power supply circuit 1, a microcontroller main control circuit 2, a button interface circuit 3, an 8-channel temperature acquisition circuit 4, a temperature acquisition channel switching circuit 5, an AD conversion circuit 6, a communication switching circuit 7, an extended IO control interface circuit 8, a temperature control interface circuit 9, an AC control interface circuit 10, a liquid crystal display circuit 11, a tri-color LED interface circuit 12, a 485 communication circuit 13, and an input detection extended IO circuit 14. The microcontroller main control circuit 2, button interface circuit 3, 8-channel temperature acquisition circuit 4, temperature acquisition channel switching circuit 5, AD conversion circuit 6, communication switching circuit 7, extended IO control interface circuit 8, temperature control interface circuit 9, AC control interface circuit 10, liquid crystal display circuit 11, tri-color LED interface circuit 12, 485 communication circuit 13, and input detection extended IO circuit 14 are also included. Temperature control interface circuit 9, AC control interface circuit 10, LCD display circuit 11, tri-color lamp interface circuit 12, 485 communication circuit 13, and input detection extended IO circuit 14 are all electrically connected to the power supply circuit 1. Key interface circuit 3, temperature acquisition channel switching circuit 5, AD conversion circuit 6, communication switching circuit 7, extended IO control interface circuit 8, temperature control interface circuit 9, AC control interface circuit 10, LCD display circuit 11, tri-color lamp interface circuit 12, 485 communication circuit 13, and input detection extended IO circuit 14 are all electrically connected to the microcontroller main control circuit 2. The 8-channel temperature acquisition circuit 4 is electrically connected to the temperature acquisition channel switching circuit 5.

[0024] The 8-channel temperature acquisition circuit 4 collects the temperature inside the aging vehicle. The microcontroller main control circuit 2 controls the temperature acquisition channel switching circuit 5 to switch and poll the temperature acquisition signal to the AD conversion circuit 6 for conversion into digital quantity. The microcontroller main control circuit 2 communicates with the AD conversion circuit 6 through pin control to obtain data. The button circuit is connected to the microcontroller main control circuit 2, allowing users to control the system independently. The communication switching circuit 7 is connected to the microcontroller main control circuit 2 to control the switching of communication between the host computer and the corresponding layer of the aging vehicle. The LCD display circuit 11 controls the display interface and user single-machine control interface through the microcontroller main control circuit 2. The 485 communication circuit 13 is connected to the microcontroller main control circuit 2, allowing the microcontroller main control circuit 2 to interact with the PC host computer software. The host computer software records aging data and temperature data, and generates data reports. The input detection extended IO control interface circuit 8 mainly provides an external sensor interface, which can be connected to digital sensors. Sensors, such as smoke sensors and other special sensors like the independent start button of the aging cart, are connected to the microcontroller main control circuit 2. The microcontroller detects and identifies the sensor input signals. The temperature control interface circuit 9 is used by the microcontroller to control and drive the output temperature control signal. It can be connected to external AC contactors and relay isolation devices to control the heating and heat dissipation devices. Combined with the collected temperature data, it forms a closed-loop temperature control. The temperature control interface circuit 9 has multi-channel output control and can realize multi-channel real-time temperature control function. The AC control interface circuit 10 is controlled by the microcontroller main control circuit 2. The AC control interface circuit 10 outputs drive signals to drive the external aging cart AC contactors and relays. The isolated drive control AC voltage is connected to the aging cart to provide AC mains voltage to the product. The extended IO control interface circuit 8 is controlled by the microcontroller main control circuit 2 and is used to control and drive the aging cart's input and output impact test IO and other IO control drives. The three-color light control interface is controlled by the microcontroller main control circuit 2 to indicate the aging cart status and is connected to the microcontroller main control circuit 2.

[0025] See Figure 2 As shown, see reference Figure 2 As shown, Figure 2The following is a reference circuit diagram of power supply circuit 1, which includes diode D2, TVS diode D3, diode D5, capacitors C1, C3, C4, C5, C6, C7, C8, and C9, power conversion module U2, step-down chip U5, Zener diode U37, resistor R12, inductor L1, and light-emitting diode LED1. The product model of power conversion module U2 is B0505S-1WR3; the product model of step-down chip U5 is XL2596S-5.0E1; the positive terminal of diode D2 is connected to two 12V power supply terminals via a wire-to-board connector (product model B2P-VH(LF)(SN)); the negative terminal of diode D2 and TVS diode D3 are connected to the 12V output terminals; pin 1 of power conversion module U2 is connected to capacitors C1 and C2, and the negative terminal of diode D2 and TVS diode D3 are connected to the 12V output terminals. C3, pin 2 of the power conversion module U2 is connected to the VCC power supply terminal; pin 3 of the power conversion module U2 is connected to one end of capacitor C4, one end of capacitor C5, and GND1 respectively; pin 4 of the power conversion module U2, the other end of capacitor C4, and the other end of capacitor C5 are connected to the 5V output terminal respectively; pin 1 of the step-down chip U5, and capacitors C7 and C8 are connected to the 12V output terminal respectively; pin 4 of the step-down chip U5, capacitors C6 and C9, Zener diode U37, and inductor L1 are connected to the VCC power supply terminal respectively; pin 2 of the step-down chip U5 is connected to diode D5 and inductor L1 respectively; pins 3, 5, and 6 of the step-down chip U5 are grounded; resistor R12 is connected to the VCC power supply terminal and the positive terminal of LED1 respectively; the negative terminal of LED1 is grounded.

[0026] The 12V power supply terminal in power circuit 1 is protected against reverse connection via D2, and then provides +12V power to the circuit. D3 is connected in parallel between the +12V power supply and the negative terminal. TVS diode D3 is a 16V TVS diode to prevent damage to the circuit from excessive external input voltage. Since the circuit requires two isolated 5V power supplies, one supplying power to the 485 communication circuit 13 and the other supplying power to the remaining circuits, the +12V voltage is input from pin 1 of U5. C7 and C8 are connected in parallel at the input terminal for filtering, stabilizing the input voltage. Pins 3 and 6 of U5 are the negative power supply pins, connected to the negative terminal. Pin 5 of U5... Pin 1 is the enable pin of the power IC. Connecting it to the negative terminal of the voltage ensures that the power IC is always in working condition. Pin 2 of U5 is the output pin, which outputs a PWM waveform. After passing through D5 for freewheeling and then through L1 and C6 for filtering, a stable 5V voltage can be output. Pin 4 of U5 is connected to the 5V output feedback to detect the output voltage. A Zener diode U37 is connected in parallel at the 5V output terminal to prevent 5V voltage overshoot. R12 and LED1 are connected to indicate that the 5V power supply is normal. Then, pins 1 and 2 of the power conversion module U2 are connected. Pins 3 and 4 of U2 output a 5V power supply isolated from another set to power the 485 communication circuit 13.

[0027] See Figure 3 As shown, Figure 3This is a reference circuit diagram of the microcontroller main control circuit 2. The microcontroller main control circuit 2 includes a microcontroller U9, capacitor C18, and capacitor C19. The product model of the microcontroller U9 is STC8A8K64D4-45I-LQFP48. Pins 2-9 of the microcontroller U9 are connected to the input detection extended IO control interface circuit 8, used to detect external sensor circuits such as smoke sensor signal input. Pins 10, 14, and 16 of the microcontroller U9 are connected to the communication switching circuit 7, used to control the switching between the PC and the 485 communication circuit 13. Pins 19 and 20 of the microcontroller U9 are connected to the 485 communication circuit 13, used for data interaction communication and control signal execution by the PC host computer software. Pins 21-26 of the microcontroller U9 are connected to the button interface circuit 3, used to detect external button input, enabling user human-computer interaction and offline operating system operation. Pins 27-29 connect to the temperature control interface circuit 9 and the AC control interface circuit 10. Through a shift register control IC, the microcontroller can control multiple outputs with fewer pins. Temperature data calculations from the microcontroller's internal parameters are used to control output heating, achieving temperature control. It can also control the switching of external AC mains power. Pins 31-33 of the microcontroller U9 connect to the temperature acquisition channel switching circuit 5, controlling it to switch the 8 temperature acquisition circuits 4 to connect to the AD conversion circuit 6 for temperature data acquisition. Pins 34-38 of the microcontroller U9 connect to the AD conversion circuit 6 for data interaction to obtain temperature acquisition data. Pins 39-41 of the microcontroller U9 connect to the tri-color light control circuit, controlling the tri-color lights to indicate the aging vehicle status. One end of capacitors C18 and C19 is connected to the VCC power supply, and the other end is grounded.

[0028] See Figure 4 As shown, Figure 4 The diagram below is a reference circuit diagram of the button interface circuit 3. The button interface circuit 3 includes a button interface. Pins 3-8 of the button interface are connected to the microcontroller main control circuit 2. Pin 9 of the button interface is grounded. Pin 10 of the button interface is connected to the VCC power supply. The button interface circuit 3 is externally connected to the button circuit input. The microcontroller main control circuit 2 can detect the button input through the interface to realize offline human-machine interaction processing.

[0029] See Figure 5 As shown, Figure 5The diagram below shows a reference circuit diagram of an 8-channel temperature acquisition circuit 4. This circuit includes 8 sets of identical, parallel-connected temperature sensor units. Each temperature sensor unit includes a temperature sensor interface U19, resistors R28 and R36, and a reference voltage regulator IC chip U22. The product model of the temperature sensor interface U19 is KF7.62-2P. Pin 2 of the temperature sensor interface U19 and pin 1 of the reference voltage regulator IC chip U22 are connected to resistor R36, respectively. Pin 1 of the temperature sensor interface U19 and pin 3 of the reference voltage regulator IC chip U22 are grounded. One end of resistor R28 is connected to pin 2 of the reference voltage regulator IC chip U22, and the other end of resistor R28 is connected to the VCC power supply. Since the remaining 7 sets of temperature sensor units have the same structure as the aforementioned temperature sensor units, they will not be described further here.

[0030] The 8-channel temperature acquisition circuit 4 connects to an external temperature sensor (such as PT100) through temperature sensor interfaces U19, U23, U25, U27, U29, U31, U33, and U35. Resistors R28-R35 are current-limiting power supplies, which are respectively connected to reference voltage regulator IC chips U22, U24, U26, U28, U30, U32, U34, and U36, providing a reference 2.5V sensor power supply voltage. Connecting resistors R36-R43 to the temperature sensor interface forms a voltage divider circuit with the temperature sensor. The connection point connects to the temperature acquisition channel switching circuit 5. The microcontroller can control the temperature acquisition switching circuit to poll and switch the scan access to the AD conversion circuit 6.

[0031] See Figure 6 As shown, Figure 6This is a reference circuit diagram of the temperature acquisition channel switching circuit 5. The temperature acquisition channel switching circuit 5 includes an operational amplifier U7 and an analog switch IC chip U10. The operational amplifier U7 is model LM258DR, and the analog switch IC chip U10 is model CD4051BM / TR. Pins 9-11 of the analog switch IC chip U10 are connected to the microcontroller main control circuit 2, controlling the switching of the 8-channel temperature acquisition circuit 4 to select one channel to output a temperature acquisition signal from pin 3 of the analog switch IC chip U10. Pins 1, 2, 4-5, and 12-15 of the analog switch IC chip U10 are connected to the 8-channel temperature acquisition circuit 4, inputting to the analog switch IC chip U10 for microcontroller-controlled switching. Pin 3 of the analog switch IC chip U10 is connected to a power supply. The signal is amplified by resistor R13 and then resistor R14. Pin 2 of the operational amplifier U7 is the inverting input and is connected to feedback resistor R9, which, together with resistor R8, forms a non-inverting amplifier circuit. Pin 1 of the operational amplifier U7 is connected to resistor R10 and outputs the amplified signal to the AD conversion circuit 6 for analog-to-digital conversion. Pin 16 of the analog switch IC chip U10 is connected to the VCC power supply (positive terminal), pin 8 of the analog switch IC chip U10 is connected to the GND terminal (negative terminal), pin 8 of the operational amplifier U7 is connected to the VCC power supply (positive terminal), and pin 4 of the operational amplifier U7 is connected to the GND terminal (negative terminal), providing operating power for the operational amplifier U7 and the analog switch IC chip U10.

[0032] See Figure 7 As shown, Figure 7The diagram below shows a reference circuit for the AD conversion circuit 6. The AD conversion circuit 6 includes an analog-to-digital converter chip U6, a voltage reference chip U8, a crystal oscillator X1, resistors R11 and R15, and a filter capacitor C15. The product model of the analog-to-digital converter chip U6 is TM7707, and the product model of the voltage reference chip U8 is LM285D-2-5. The temperature analog signal selected by the temperature acquisition switching circuit is input from pin 7 of the analog-to-digital converter chip U6. Pins 5, 12, 13, and 14 of the analog-to-digital converter chip U6 are connected to the microcontroller main control circuit 2. The microcontroller controls and reads data from the AD conversion IC through timing control. Pin 9 of the analog-to-digital converter chip U6 is connected to the voltage reference chip. Pin 8 of the voltage reference chip U8 and pin 9 of the analog-to-digital converter chip U6 are reference voltage pins, which can stabilize the output of a 2.5V reference voltage from pin 8 of the voltage reference chip U8; pins 2-3 of the analog-to-digital converter chip U6 are connected to crystal oscillator X1 and resistor R11 respectively to form a crystal oscillator clock circuit, providing the chip clock signal for the analog-to-digital converter chip U6; pins 15 and 16 of the analog-to-digital converter chip U6 are connected to the VCC terminal and the GND terminal respectively, providing the operating power for the analog-to-digital converter chip U6; pin 8 of the voltage reference chip U8 is connected to the VCC terminal through the current-limiting resistor R15, and pin 4 of the voltage reference chip U8 and the filter capacitor C15 are connected to the GND terminal respectively.

[0033] See Figure 8a and Figure 8b As shown, Figure 8a This is a schematic diagram of the first reference circuit for the communication switching circuit 7 and the extended IO control interface circuit 8. Figure 8bThis is a second reference circuit diagram of the communication switching circuit 7 and the extended IO control interface circuit 8. The communication switching circuit 7 includes eight relays K2-K9, an eight-layer communication interface, a Darlington transistor driver IC chip U13, a serial-to-parallel IC chip U16, a serial-to-parallel IC chip U17, and a Darlington transistor driver IC chip U18. The product model of the Darlington transistor driver IC chip U13 and the Darlington transistor driver IC chip U18 is ULN2803A. The serial-to-parallel IC chip U16 and the serial-to-parallel IC chip U17... The product model of chip U17 is 74HC595D; the extended IO control interface circuit 8 includes an extended IO interface AC3, the product model of which is PZ254V-12-10P; the eight relays K2-K9 are electrically connected to the Darlington transistor driver IC chip U13, and the eight relays K2-K9 are double-pole double-throw relays. The common terminal of the eight relays K2-K9 is connected to the 485 communication circuit 13, and the normally open contacts of the eight relays K2-K9 are connected to the communication interfaces of layers 1-8 respectively; the serial-to-parallel IC chip U16 and the serial-to-parallel IC chip U17 are electrically connected to the microcontroller main control circuit 2, wherein the serial-to-parallel IC chip U16 is electrically connected to the Darlington transistor driver IC chip U18, and the serial-to-parallel IC chip U17 is electrically connected to the extended IO interface AC3. Chip U18 is electrically connected to the extended IO interface AC3.

[0034] In the communication switching circuit 7 and the extended IO control interface circuit 8, U16 and U17 are both 16-bit serial-to-parallel IC chips, which can realize the control of 16 outputs by 3 IOs of the microcontroller. Pins 12 and 11 of U16 and U17 are connected to the microcontroller main control circuit 2 to control the clock and latch of the shift register. Pin 14 of U16 is connected to the microcontroller main control circuit for serial data input. Pin 9 of U16 is a data overflow pin cascaded to pin 14 of U17 to input to another 8 shift registers. Pins 1-7 of U16 output to U13. Pins 1-7 of U13 output to control relays K2-K9. K2-K9 realize the drive control communication switching. Pins 1-7 of U17 are connected to pins 1-8 of U18 to drive the output to the extended IO interface AC3, thereby driving relays and other devices.

[0035] See Figure 9 As shown, Figure 9The diagram below shows a reference circuit for the temperature control interface circuit 9 and the AC control interface circuit 10. The temperature control interface circuit 9 includes a Darlington transistor driver IC chip U11, a serial-to-parallel converter IC chip U12, and an AC control interface AC1. The AC control interface circuit 10 includes a serial-to-parallel converter IC chip U14, a Darlington transistor driver IC chip U15, and an AC control interface AC2. The product models of the Darlington transistor driver IC chips U11 and U15 are ULN2803A, the product models of the serial-to-parallel converter IC chips U12 and U14 are 74HC595D, and the product models of the AC control interfaces AC1 and AC2 are PZ254V-12-10P. The serial-to-parallel converter IC chips U12 and U14 are both electrically connected to the microcontroller main control circuit 2, and the Darlington transistor driver IC chip U11 is connected to the serial-to-parallel converter IC chip U14. Chip U12 and AC control interface AC1 are electrically connected. The Darlington transistor driver IC chip U15 is electrically connected to the serial-to-parallel IC chip U14 and AC control interface AC2, respectively. The temperature control interface circuit 9 is also based on a shift register to achieve serial-to-parallel conversion. The Darlington transistor driver IC chips U11 and U15 are used to increase the output current. The temperature control interface circuit 9, composed of Darlington transistor driver IC chip U11, serial-to-parallel IC chip U12, and AC control interface AC1, can be linked with temperature detection to control the temperature and achieve constant temperature function. The Darlington transistor driver IC chip U15, serial-to-parallel IC chip U14, and AC control interface AC2, constitute AC control interface circuit 10. The microcontroller main control circuit 2 can control this circuit to drive the AC control relay and AC contactor of the aging cart and control the AC power supply inside the aging cart.

[0036] See Figure 10 As shown, Figure 10This is a reference circuit diagram of a liquid crystal display circuit 11, which includes an LCD screen, a resistor R20, a transistor Q4, and a potentiometer R23. Pin 1 of the LCD screen is connected to the collector of the transistor Q4, and the base of the transistor Q4 is connected to the microcontroller main control circuit 2 through the resistor R20. Pin 1 of the LCD screen is the backlight pin, which drives the backlight through the transistor Q4 and is controlled by the microcontroller main control circuit 2. Pins 3-7 and 9 of the LCD screen are connected to the microcontroller main control circuit 2 to control the display temperature and the interactive interface. Pin 10 of the LCD screen is connected to potentiometer R23 to adjust the screen contrast. Pins 8 and 12 of the LCD screen are connected to the negative power supply GND terminal, and pins 2 and 11 of the LCD screen are connected to the positive power supply VCC terminal.

[0037] See Figure 11 As shown, Figure 11 This is a reference circuit diagram of the tri-color lamp interface circuit 12, which includes a tri-color lamp interface H1 and three sets of parallel relay switch units. The product model of the tri-color lamp interface H1 is VH3.96-4P. ZZ, the three sets of relay switch units are respectively connected to pins 1-3 of the tri-color lamp interface H1 and the microcontroller main control circuit 2. The tri-color lamp interface circuit 12 is used to control the tri-color lamp, which is a status indicator light with three colors: red, yellow and green, used to indicate the working status of the aging vehicle. The relays K10-K12 of the three sets of relay switch units directly drive 12V to the working voltage of the tri-color lamp to control the tri-color lamp. The three relays K10-K12 are driven by three transistors Q5-Q7. The base of the transistors is connected to R44-R46 to control the microcontroller main control circuit 2. The normally open terminals of the three relays K10-K12 are respectively connected to pins 1-3 of the tri-color lamp interface H1, and the common terminal of the three relays K10-K12 is connected to the 12V power supply.

[0038] See Figure 12 As shown, Figure 12This is a reference circuit diagram of a 485 communication circuit 13. The 485 communication circuit 13 includes an optocoupler U1, an optocoupler U4, a communication IC chip U3, and a 485 signal communication interface. The product models of optocouplers U1 and U4 are 6N137S1(TA), and the product model of the communication IC chip U3 is SN65LBC184DR. The communication IC chip U3 is electrically connected to the optocouplers U1 and U4, and the 485 signal communication interface, respectively. The optocouplers U1 and U4 are electrically connected to the single-chip main control circuit. When the chip-connected main control circuit needs to send data to the host computer, it inputs the data via serial communication from pin 3 of U4. Optocoupler U4 transmits the data to pin 6, controlling the base of transistor Q1. Data transmission is achieved by controlling the on / off state of transistor Q1. Transistor Q1 inverts data, changing data 1 to data 0. Resistor R7 is the base resistor of transistor Q1, and resistor R6 is the emitter resistor. Data is output to pins 2 and 3 of U3 via the emitter of transistor Q1. U3 is a TTL (Time to Transform) connector. Live (the data packet lifecycle defined in the IP protocol) is a communication IC chip that converts signals to RS-485 signals. After data is converted into differential signals, it can be transmitted further and more stably. It is output from pins 7 and 6 of the communication IC chip U3. Through resistors R48 and R47 (pull-down and pull-up resistors), the load-carrying capacity of the differential line can be enhanced. Then, through resistors R3 and R4, it outputs to pins 2 and 3 of the communication interface, allowing direct remote connection to a RS-485 communication box on a PC, thus transmitting data to the PC. This is achieved through diode D1 and diode... D4 is a TVS diode for differential signal lines, which protects the communication IC chip U3 from being burned out by external surges. When the PC host computer software sends data, it is input to pins 7 and 6 of the communication IC chip U3 through the communication interface. The data is internally converted into a TTL signal and output from pin 1 of the communication IC chip U3. The TTL signal is then sent to pin 3 of the optocoupler U1 for serial data input. The data can then be output from pin 6 of the optocoupler U1 and connected to the microcontroller main control circuit 2. The data can then enter the microcontroller main control circuit 2 and be received by the microcontroller.

[0039] See Figure 13 As shown, Figure 13The following is a reference circuit diagram of the input detection extended I / O circuit 14. The input detection extended I / O circuit 14 includes an input interface and a pull-up resistor RN1. The product model of the input interface is ZX-XH2.54-10PZZ. Pins 1-2 of the input interface are connected to the negative power supply terminal GND. The input interface and the pull-up resistor RN1 are respectively connected to the microcontroller main control circuit 2. The pull-up resistor RN1 is connected to the VCC power supply terminal. The input interface can connect to smoke sensors and other special sensors. Pins 3-10 of the input interface are the input I / O. Pins 1-2 of the input interface are connected to the negative power supply to provide a reference negative terminal for the connected sensor. RN1 is a pull-up resistor for the input signal to improve the stability of the input signal. It is then connected to the microcontroller main control circuit 2. The microcontroller main control circuit 2 detects external sensor signals such as smoke and other sensors. Through internal judgment, it can realize protection functions such as switching the AC power supply of the aging car and stopping aging.

[0040] Compared with the prior art, the intelligent main control circuit of the multi-channel constant temperature control aging cart described in this embodiment of the utility model can perform multi-channel temperature measurement and control through the single-chip microcomputer main control circuit 2, and can realize the real-time temperature control function of up to 8 aging compartments. The temperature data can be displayed on the screen through the LCD display circuit 11, and uploaded to the host computer software PC through the 485 communication circuit 13 for display and storage of aging data reports. The single-chip microcomputer main control circuit 2 can realize host computer control and flexible control of the AC power supply system and communication switching function of the aging cart. At the same time, it can realize smoke detection function or alarm control function through various connected sensors, realize the three-color working status indicator control function based on the three-color light interface circuit 9, and realize aging compartment lock and door opening and closing detection function, multi-layer communication layer cutting function, product aging input and output impact switching function, etc. Through multi-channel switching, the multi-functional control of the aging cart main control is realized.

[0041] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0042] Similarly, it should be understood that, in order to simplify this disclosure and aid in understanding one or more of the various aspects of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof in the description of exemplary embodiments of the invention above. Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and it should be noted that the above embodiments are illustrative of the invention and not restrictive, and that alternative embodiments can be devised by those skilled in the art without departing from its scope.

Claims

1. A multi-channel constant temperature control aging car intelligent main control circuit, characterized in that, The intelligent main control circuit of the multi-channel constant temperature control aging cart includes: a power supply circuit, a microcontroller main control circuit, a button interface circuit, an 8-channel temperature acquisition circuit, a temperature acquisition channel switching circuit, an AD conversion circuit, a communication switching circuit, an extended IO control interface circuit, a temperature control interface circuit, an AC control interface circuit, an LCD display circuit, a tri-color LED interface circuit, a 485 communication circuit, and an input detection extended IO circuit. The microcontroller main control circuit, button interface circuit, 8-channel temperature acquisition circuit, temperature acquisition channel switching circuit, AD conversion circuit, communication switching circuit, extended IO control interface circuit, temperature... The control interface circuit, AC control interface circuit, LCD display circuit, tri-color lamp interface circuit, 485 communication circuit, and input detection extended IO circuit are all electrically connected to the power supply circuit. The button interface circuit, temperature acquisition channel switching circuit, AD conversion circuit, communication switching circuit, extended IO control interface circuit, temperature control interface circuit, AC control interface circuit, LCD display circuit, tri-color lamp interface circuit, 485 communication circuit, and input detection extended IO circuit are all electrically connected to the microcontroller main control circuit. The 8-channel temperature acquisition circuit is electrically connected to the temperature acquisition channel switching circuit.

2. The intelligent main control circuit for the multi-channel constant temperature control aging cart according to claim 1, characterized in that: The power supply circuit includes diode D2, TVS diode D3, diode D5, capacitors C1, C3, C4, C5, C6, C7, C8, and C9, a power conversion module U2, a step-down chip U5, a Zener diode U37, a resistor R12, an inductor L1, and an LED1. The product model of the power conversion module U2 is B0505S-1WR3; the product model of the step-down chip U5 is XL2596S-5.0E1. The anode of diode D2 is connected to two 12V power supply terminals via a wire-to-board connector, and the cathode of diode D2 and TVS diode D3 are connected to the 12V output terminals. Pin 1 of the power conversion module U2 is connected to capacitors C1 and C3, and pin 2 of the power conversion module U2 is connected to... Connecting to the VCC power supply terminal, pin 3 of the power conversion module U2 is connected to one end of capacitor C4, one end of capacitor C5, and GND1 respectively. Pin 4 of the power conversion module U2, the other end of capacitor C4, and the other end of capacitor C5 are connected to the 5V output terminal respectively. Pin 1 of the step-down chip U5, capacitors C7 and C8 are connected to the 12V output terminal respectively. Pin 4 of the step-down chip U5, capacitors C6 and C9, Zener diode U37, and inductor L1 are connected to the VCC power supply terminal respectively. Pin 2 of the step-down chip U5 is connected to diode D5 and inductor L1 respectively. Pins 3, 5, and 6 of the step-down chip U5 are grounded. Resistor R12 is connected to the VCC power supply terminal and the positive terminal of LED1 respectively. The negative terminal of LED1 is grounded.

3. The intelligent main control circuit for the multi-channel constant temperature control aging cart according to claim 2, characterized in that: The microcontroller main control circuit includes microcontroller U9, capacitor C18, and capacitor C19. The product model of microcontroller U9 is STC8A8K64D4-45I-LQFP48. Pins 2-9 of microcontroller U9 are connected to the input detection extended IO control interface circuit; pins 10, 14, and 16 of microcontroller U9 are connected to the communication switching circuit; pins 19 and 20 of microcontroller U9 are connected to the 485 communication circuit; and pins 21-26 of microcontroller U9 are connected to... The circuit includes a button interface; pins 27-29 of the microcontroller U9 are connected to the temperature control interface circuit and the AC control interface circuit; pins 31-33 of the microcontroller U9 are connected to the temperature acquisition channel switching circuit; pins 34-38 of the microcontroller U9 are connected to the AD conversion circuit; pins 39-41 of the microcontroller U9 are connected to the tri-color lamp control circuit; one end of capacitor C18 and capacitor C19 are connected to the VCC power supply terminal, and the other end of capacitor C18 and capacitor C19 are grounded.

4. The intelligent main control circuit for the multi-channel constant temperature control aging cart according to claim 3, characterized in that: The 8-channel temperature acquisition circuit includes 8 sets of identical and parallel temperature sensor units. Each temperature sensor unit includes a temperature sensor interface U19, resistors R28 and R36, and a reference voltage regulator IC chip U22. The product model of the temperature sensor interface U19 is KF7.62-2P. Pin 2 of the temperature sensor interface U19 and pin 1 of the reference voltage regulator IC chip U22 are respectively connected to resistor R36. Pin 1 of the temperature sensor interface U19 and pin 3 of the reference voltage regulator IC chip U22 are grounded. One end of the resistor R28 is connected to pin 2 of the reference voltage regulator IC chip U22, and the other end of the resistor R28 is connected to the VCC power supply terminal.

5. The intelligent main control circuit for the multi-channel constant temperature control aging cart according to claim 4, characterized in that: The temperature acquisition channel switching circuit includes an operational amplifier U7 and an analog switch IC chip U10. The product model of the operational amplifier U7 is LM258DR, and the product model of the analog switch IC chip U10 is CD4051BM / TR. Pins 9-11 of the analog switch IC chip U10 are connected to the microcontroller main control circuit. Pins 1, 2, 4-5, and 12-15 of the analog switch IC chip U10 are connected to the 8-channel temperature acquisition circuit. Pin 3 of the analog switch IC chip U10 is connected to resistor R13 and then through resistor R14 to the operational amplifier U7. Pin 2 of the operational amplifier U7 is connected to the feedback resistor R9. Pin 1 of the operational amplifier U7 is connected to resistor R10. Pin 16 of the analog switch IC chip U10 is connected to the VCC power supply terminal. Pin 8 of the analog switch IC chip U10 is connected to the GND terminal. Pin 8 of the operational amplifier U7 is connected to the VCC power supply terminal, and pin 4 of the operational amplifier U7 is connected to the GND terminal.

6. The intelligent main control circuit for the multi-channel constant temperature control aging cart according to claim 5, characterized in that: The AD conversion circuit includes an analog-to-digital converter chip U6, a voltage reference chip U8, a crystal oscillator X1, resistors R11 and R15, and a filter capacitor C15. The product model of the analog-to-digital converter chip U6 is TM7707, and the product model of the voltage reference chip U8 is LM285D-2-5. Pins 5, 12, 13, and 14 of the analog-to-digital converter chip U6 are connected to the microcontroller main control circuit. Pin 9 of the analog-to-digital converter chip U6 is connected to pin 8 of the voltage reference chip U8. Pins 2 and 3 of the analog-to-digital converter chip U6 are connected to the crystal oscillator X1 and resistor R11, respectively. Pins 15 and 16 of the analog-to-digital converter chip U6 are connected to the VCC terminal and the GND terminal, respectively. Pin 8 of the voltage reference chip U8 is connected to the VCC terminal through resistor R15, and pin 4 of the voltage reference chip U8 and the filter capacitor C15 are connected to the GND terminal.

7. The intelligent main control circuit for the multi-channel constant temperature control aging cart according to claim 5, characterized in that: The communication switching circuit includes eight relays K2-K9, an eight-layer communication interface, a Darlington transistor driver IC chip U13, a serial-to-parallel converter IC chip U16, a serial-to-parallel converter IC chip U17, and a Darlington transistor driver IC chip U18. The product models of Darlington transistor driver IC chips U13 and U18 are ULN2803A, and the product models of serial-to-parallel converter IC chips U16 and U17 are 74HC595D. The extended IO control interface circuit includes an extended IO interface AC3, the product model of which is PZ254V-12-10P. The eight relays K2-K9 are respectively connected to the Darlington transistor driver IC... Chip U13 is electrically connected. The eight relays K2-K9 are double-pole double-throw relays. The common terminal of the eight relays K2-K9 is connected to the 485 communication circuit. The normally open contacts of the eight relays K2-K9 are respectively connected to the communication interface of layer 8. The serial-to-parallel IC chip U16 and serial-to-parallel IC chip U17 are electrically connected to the microcontroller main control circuit. Specifically, the serial-to-parallel IC chip U16 is electrically connected to the Darlington transistor driver IC chip U18, the serial-to-parallel IC chip U17 is electrically connected to the extended I / O interface AC3, and the Darlington transistor driver IC chip U18 is electrically connected to the extended I / O interface AC3. The temperature control interface circuit includes a Darlington transistor driver IC chip U11, a serial-to-parallel converter IC chip U12, and an AC control interface AC1. The AC control interface circuit includes a serial-to-parallel converter IC chip U14, a Darlington transistor driver IC chip U15, and an AC control interface AC2. The product models of Darlington transistor driver IC chips U11 and U15 are ULN2803A, the product models of serial-to-parallel converter IC chips U12 and U14 are 74HC595D, and the product models of AC control interfaces AC1 and AC control interfaces AC2 are PZ254V-12-10P. The serial-to-parallel converter IC chips U12 and U14 are electrically connected to the microcontroller's main control circuit, and the Darlington transistor driver IC chip U11 is electrically connected to both the serial-to-parallel converter IC chip U12 and the AC control interface AC1. Chip U15 is electrically connected to the serial-to-parallel IC chip U14 and the AC control interface AC2.

8. The intelligent main control circuit for the multi-channel constant temperature control aging cart according to claim 7, characterized in that: The liquid crystal display circuit includes an LCD screen, a resistor R20, a transistor Q4, and a potentiometer R23. Pin 1 of the LCD screen is connected to the collector of the transistor Q4, and the base of the transistor Q4 is connected to the microcontroller main control circuit through the resistor R20. Pins 3-7 and 9 of the LCD screen are connected to the microcontroller main control circuit. Pin 10 of the LCD screen is connected to potentiometer R23. Pins 8 and 12 of the LCD screen are connected to the GND terminal, and pins 2 and 11 of the LCD screen are connected to the VCC power supply terminal.

9. The intelligent main control circuit for the multi-channel constant temperature control aging cart according to claim 8, characterized in that: The tri-color lamp interface circuit includes a tri-color lamp interface H1 and three sets of parallel relay switch units. The product model of the tri-color lamp interface H1 is VH3.96-4P ZZ. The three sets of relay switch units are respectively connected to pins 1-3 of the tri-color lamp interface H1 and the microcontroller main control circuit.

10. The intelligent main control circuit for the multi-channel constant temperature control aging cart according to claim 9, characterized in that: The 485 communication circuit includes an optocoupler U1, an optocoupler U4, a communication IC chip U3, and a 485 signal communication interface. The product model of the communication IC chip U3 is SN65LBC184DR. The communication IC chip U3 is electrically connected to the optocoupler U1, the optocoupler U4, and the 485 signal communication interface. The optocoupler U1 and the optocoupler U4 are electrically connected to the single-chip main control circuit.

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