Multipath temperature-sensing real-time monitoring system

Abstract

The invention relates to the technical field of temperature monitoring, in particular to a multipath temperature-sensing real-time monitoring system, which comprises a power supply module, a first multiplexing chip U1, a second multiplexing chip U2, a main control chip U3, a voltage division module and a pin header J4, the voltage dividing module comprises a plurality of voltage dividing resistors; each of the first multiplexing chip U1 and the second multiplexing chip U2 is provided with a plurality of detection channels; the pin header J4 is provided with a plurality of connecting interfaces; and each divider resistor is connected with each detection channel and each connection interface. According to the invention, the power supply module, the first multiplexing chip U1, the second multiplexing chip U2, the main control chip U3, the voltage division module and the pin header J4 are arranged, so that the first multiplexing chip U1 and the second multiplexing chip U2 can be accurately commanded, seamless and accurate switching is realized in a multi-path temperature measurement circuit, and the temperature measurement efficiency and the data comprehensiveness are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of temperature monitoring, in particular to a multi-channel temperature sensing real-time monitoring system. BACKGROUND

[0002] NTC (Negative Temperature Coefficient) thermistors, with their high sensitivity, excellent stability and fast response speed, play an important role in battery temperature measurement. Its working principle cleverly uses the thermosensitive effect, that is, the resistance value will decrease with the rise of temperature, so as to accurately determine the temperature by measuring the resistance value. However, the existing technical solutions are not perfect. They often cannot simulate the complex conditions of NTC in actual use, are difficult to realize long-term continuous monitoring of multiple NTC states, and are unable to test multiple NTCs in harsh conditions to verify the durability and service life of the product. SUMMARY

[0003] The purpose of the present application is to provide a multi-channel temperature sensing real-time monitoring system to solve the above problems in the prior art.

[0004] The purpose of the present application is achieved by the following technical solution: a multi-channel temperature sensing real-time monitoring system, comprising a power module, a first multiplexing chip U1, a second multiplexing chip U2, a master control chip U3, a voltage dividing module and a pin header J4.

[0005] The power module is used to power the first multiplexing chip U1, the second multiplexing chip U2, the master control chip U3 and the voltage dividing module.

[0006] The voltage dividing module comprises a plurality of voltage dividing resistors; the first multiplexing chip U1 and the second multiplexing chip U2 are each provided with a plurality of detection channels; the pin header J4 is provided with a plurality of connection interfaces; each voltage dividing resistor is connected with each detection channel and each connection interface respectively.

[0007] The master control chip U3 is electrically connected with the first multiplexing chip U1 and the second multiplexing chip U2 respectively; the master control chip U3 sends signals to the first multiplexing chip U1 and the second multiplexing chip U2 to control the on-off of each detection channel.

[0008] The present application further provides that the power module comprises a connector J1; the connector J1 is provided with a first positive input port, a first negative input port and a 5V input port; the first positive input port and the first negative input port are used to power the first multiplexing chip U1 and the second multiplexing chip U2; the 5V input port is used to power the voltage dividing module and the master control chip U3.

[0009] One end of the voltage division resistor is connected with the 5V input port; the other end of the voltage division resistor is connected with the detection channel and the connection interface respectively.

[0010] The application further provides that a diode D3 is arranged between the connector J1 and the first positive input port; and a diode D4 is arranged between the connector J1 and the first negative input port.

[0011] The application further provides that the first multiplexing chip U1 and the second multiplexing chip U2 are both provided with a signal transmission port; the signal transmission port is connected with the master control chip U3; and the signal transmission port is provided with an RC parallel component.

[0012] The application further provides that the multipath temperature sensing real-time monitoring system further comprises a NAND gate module; the master control chip U3 is provided with a signal control port; the first multiplexing chip U1 is provided with a first signal receiving port; and the second multiplexing chip U2 is provided with a second signal receiving port.

[0013] The NAND gate module comprises a resistor R43, a MOS tube Q4 and a resistor R44; the gate of the MOS tube Q4 is connected with the signal control port; the gate of the MOS tube Q4 is connected with the source of the MOS tube Q4 through the resistor R44; the source of the MOS tube Q4 is grounded; the drain of the MOS tube Q4 is connected with the 5V input port through the resistor R43; the second signal receiving port is arranged between the drain of the MOS tube Q4 and the resistor R43; and the first signal receiving port is connected with the signal control port.

[0014] The application further provides that the multipath temperature sensing real-time monitoring system further comprises a first output control module; the first output control module comprises a relay RE1, a diode D1, a triode Q2, a resistor R37 and a resistor R38.

[0015] The master control chip U3 is connected with the base of the triode Q2 through the resistor R37; the base of the triode Q2 is connected with the emitter of the triode Q2 through the resistor R38; the emitter of the triode Q2 is grounded; the collector of the triode Q2 is connected with the 5V input port through the control end of the relay RE1; the control end of the relay RE1 is connected with the diode D1 in parallel; and the switching end of the relay RE1 is connected with the connector J1.

[0016] The application further provides that the multipath temperature sensing real-time monitoring system further comprises a second output control module; the second output control module comprises a relay RE2, a diode D2, a triode Q3, a resistor R39 and a resistor R40.

[0017] The main control chip U3 is connected with the base of the transistor Q3 through the resistance R39; the base of the transistor Q3 is connected with the emitter of the transistor Q3 through the resistance R40; the emitter of the transistor Q3 is grounded; the collector of the transistor Q3 is connected with the 5V input port through the control end of the relay RE2; the control end of the relay RE2 is connected with the diode D2 in parallel; the switch end of the relay RE2 is connected with the connector J1.

[0018] The application further provides that the multi-path temperature sensing real-time monitoring system further comprises a resistance R35, a transistor Q1, a resistance R36, a capacitor C6, a buzzer B1 and a capacitor C5; the main control chip U3 is connected with the base of the transistor Q1 through the resistance R35; the emitter of the transistor Q1 is connected with the 5V input port; the collector of the transistor Q1 is connected with the emitter of the transistor Q1 through the resistance R36, the capacitor C6 and the capacitor C5 in sequence; the buzzer B1 is connected with the capacitor C6 in parallel.

[0019] The application further provides that the multi-path temperature sensing real-time monitoring system further comprises a row pin J5; the 5V input port is connected with the row pin J5; the row pin J5 is connected with the main control chip U3; the main control chip U3 is grounded through the capacitor C14.

[0020] The application further provides that the multi-path temperature sensing real-time monitoring system further comprises a first light-emitting LED1, a second light-emitting LED2, a resistance R41 and a resistance R42; the positive pole of the first light-emitting LED1 and the positive pole of the second light-emitting LED2 are respectively connected with the 5V input port; the negative pole of the first light-emitting LED1 and the negative pole of the second light-emitting LED2 are respectively connected with the main control chip U3.

[0021] The application has the beneficial effects that by arranging the power module, the first multiplexing chip U1, the second multiplexing chip U2, the main control chip U3, the voltage division module and the row pin J4, the first multiplexing chip U1 and the second multiplexing chip U2 can be accurately commanded, the seamless and accurate switching in the multi-path temperature measuring circuit is realized, and thus the temperature measuring efficiency and the comprehensiveness of data are improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the circuit principle diagram of the power module of the application;

[0023] Figure 2 is the circuit principle diagram of the first multiplexing chip U1 of the application;

[0024] Figure 3 is the circuit principle diagram of the second multiplexing chip U2 of the application;

[0025] Figure 4 is the circuit principle diagram of the NAND gate module of the application;

[0026] Figure 5 is the circuit schematic diagram of the first output control module of the application;

[0027] Figure 6 is the circuit schematic diagram of the second output control module of the application;

[0028] Figure 7 is the circuit schematic diagram of the buzzer B1 of the application;

[0029] Figure 8 is the circuit schematic diagram of the pin J4 of the application;

[0030] Figure 9 is the circuit schematic diagram of the voltage division module of the application;

[0031] Figure 10 is the circuit schematic diagram of the pin J5 of the application;

[0032] Figure 11 is the circuit schematic diagram of the master control chip U3 of the application;

[0033] Wherein: 1, connection interface; 2, voltage division resistor; 3, detection channel; 41, first positive input port; 42, first negative input port; 43, 5V input port; 5, signal transmission port; 6, signal control port; 71, first signal receiving port; 72, second signal receiving port. DETAILED DESCRIPTION

[0034] The application will be further described in conjunction with the following examples.

[0035] It can be known that the multi-channel temperature sensing real-time monitoring system described in the embodiment comprises a power module, a first multiplexing chip U1, a second multiplexing chip U2, a master control chip U3, a voltage division module, and a pin J4. Figures 1 to 11 The power module is used to supply power to the first multiplexing chip U1, the second multiplexing chip U2, the master control chip U3, and the voltage division module.

[0036] The voltage division module comprises a plurality of voltage division resistors 2; the first multiplexing chip U1 and the second multiplexing chip U2 are each provided with a plurality of detection channels 3; the pin J4 is provided with a plurality of connection interfaces 1; each voltage division resistor 2 is connected with each detection channel 3 and each connection interface 1, respectively.

[0037] The master control chip U3 is electrically connected with the first multiplexing chip U1 and the second multiplexing chip U2, respectively; the master control chip U3 sends signals to the first multiplexing chip U1 and the second multiplexing chip U2 so as to control the on-off of each detection channel 3.

[0038] ​

[0039] Specifically, the multi-channel temperature sensing real-time monitoring system described in the embodiment can accurately command the first multiplexing chip U1 and the second multiplexing chip U2 to realize seamless and accurate switching in the multi-channel temperature measuring circuit, thereby improving the temperature measuring efficiency and the comprehensiveness of data.

[0040] The multi-channel temperature sensing real-time monitoring system described in the embodiment, the power module comprises a connector J1; the connector J1 is provided with a first positive input port 41, a first negative input port 42 and a 5V input port 43; the first positive input port 41 and the first negative input port 42 are used to power the first multiplexing chip U1 and the second multiplexing chip U2; the 5V input port 43 is used to power the voltage dividing module and the master control chip U3; one end of the voltage dividing resistor 2 is connected with the 5V input port 43; the other end of the voltage dividing resistor 2 is connected with the detection channel 3 and the connection interface 1 respectively.

[0041] Specifically, the power supply of the device uses external DC+-15V and DC+5V power supply, the first positive input port 41 is DC+15V power supply, the first negative input port 42 is DC-15V power supply, the first positive input port 41 and the first negative input port 42 power the first multiplexing chip U1 and the second multiplexing chip U2, and the 5V input port 43 powers the master control chip U3 and the rest of the circuit modules.

[0042] The multi-channel temperature sensing real-time monitoring system described in the embodiment, the connector J1 and the first positive input port 41 are provided with a diode D3; the connector J1 and the first negative input port 42 are provided with a diode D4. The functions of the diode D3 and the diode D4 are as follows:

[0043] Anti-reverse connection protection: by using the one-way conductivity of the diode D3 and the diode D4, when the power plug is reversed, the diode D3 and the diode D4 are in the reverse blocking state and cannot form a current loop, thereby protecting the subsequent circuit from being damaged.

[0044] Anti-interference isolation: connecting the diode D3 and the diode D4 in series in front of the power supply can reduce the influence of the subsequent power supply on the previous stage and avoid interference on the previous stage circuit when the subsequent current is unstable.

[0045] Prevent reverse voltage damage: in the case of sudden power failure, a reverse voltage will be generated on the inductor, and the diode D3 and the diode D4 can form a current path with the reverse voltage, avoiding damage to the power supply caused by reverse overvoltage.

[0046] The first multiplexing chip U1 and the second multiplexing chip U2 are provided with signal transmission ports 5; the signal transmission ports 5 are connected with the main control chip U3; the signal transmission ports 5 are provided with RC parallel components.

[0047] The model of the first multiplexing chip U1 and the second multiplexing chip U2 is MAX306CWI; the first multiplexing chip U1 and the second multiplexing chip U2 transmit the data of each detection channel 3 to the main control chip U3 through the signal transmission ports 5; the RC parallel components mainly play the roles of affecting the passing of specific frequency signals, filtering and serving as protection circuits.

[0048] The multipath temperature sensing real-time monitoring system further comprises a NAND gate module; the main control chip U3 is provided with a signal control port 6; the first multiplexing chip U1 is provided with a first signal receiving port 71; the second multiplexing chip U2 is provided with a second signal receiving port 72.

[0049] The NAND gate module comprises a resistor R43, a MOS tube Q4 and a resistor R44; the gate of the MOS tube Q4 is connected with the signal control port 6; the gate of the MOS tube Q4 is connected with the source of the MOS tube Q4 through the resistor R44; the source of the MOS tube Q4 is grounded; the drain of the MOS tube Q4 is connected with a 5V input port 43 through the resistor R43; the second signal receiving port 72 is arranged between the drain of the MOS tube Q4 and the resistor R43; the first signal receiving port 71 is connected with the signal control port 6.

[0050] Specifically, when the signal control port 6 is high, the MOS tube Q4 is turned on so as to make the second signal receiving port 72 input low; on the contrary, when the signal control port 6 is low, the MOS tube Q4 is turned off so as to make the second signal receiving port 72 input high; by setting the NAND gate module, the first multiplexing chip U1 and the second multiplexing chip U2 can be used alternately, wherein the resistor R44 and the resistor R43 play the roles of current limiting, oscillation suppression and voltage division.

[0051] The multi-channel temperature sensing real-time monitoring system further comprises a first output control module; the first output control module comprises a relay RE1, a diode D1, a triode Q2, a resistor R37 and a resistor R38; the main control chip U3 is connected with the base of the triode Q2 through the resistor R37; the base of the triode Q2 is connected with the emitter of the triode Q2 through the resistor R38; the emitter of the triode Q2 is grounded; the collector of the triode Q2 is connected with the 5V input port 43 through the control end of the relay RE1; the control end of the relay RE1 is connected with the diode D1 in parallel; and the switching end of the relay RE1 is connected with the connector J1. The multi-channel temperature sensing real-time monitoring system further comprises a second output control module; the second output control module comprises a relay RE2, a diode D2, a triode Q3, a resistor R39 and a resistor R40; the main control chip U3 is connected with the base of the triode Q3 through the resistor R39; the base of the triode Q3 is connected with the emitter of the triode Q3 through the resistor R40; the emitter of the triode Q3 is grounded; the collector of the triode Q3 is connected with the 5V input port 43 through the control end of the relay RE2; the control end of the relay RE2 is connected with the diode D2 in parallel; and the switching end of the relay RE2 is connected with the connector J1.

[0052] Specifically, the first output control module and the second output control module can control the start and stop of an external larger current or voltage device; the diode D1 and the diode D2 play a protection role, preventing reverse voltage from damaging other elements when the relay RE1 and the relay RE2 are powered off; the resistor R37 and the resistor R39 play a role of limiting current: protecting the triode Q2 and the triode Q3 from being damaged by excessive current, while reducing electromagnetic interference.

[0053] The resistor R38 and the resistor R40 play a role of:

[0054] providing a bias voltage: ensuring that the triode Q2 and the triode Q3 work in an amplification state;

[0055] stabilizing the bias point: by forming a negative feedback, reducing the influence of temperature changes on the characteristics of the triode Q2 and the triode Q3, and maintaining the stability of the collector current;

[0056] preventing self-oscillation: in high-frequency or high-speed switching circuits, increasing circuit damping, reducing high-frequency gain, suppressing oscillation, and improving circuit stability;

[0057] improving switching performance: accelerating the consumption of base charge, making the triode Q2 and the triode Q3 switch from the on state to the off state faster, and improving switching speed and efficiency;

[0058] Prevent false turn-on: Avoid the high dV / dt transient causing potentially dangerous parasitic turn-on effect when the base is open.

[0059] By controlling the high and low level of relay1 and relay2 of the input main control chip U3, the conduction of NPN transistor Q2 and NPN transistor Q3 is controlled, so as to control the opening and closing of relay RE1 and relay RE2, and control the start and stop of the larger current or voltage equipment outside

[0060] The multi-channel temperature sensing real-time monitoring system further comprises a resistor R35, a transistor Q1, a resistor R36, a capacitor C6, a buzzer B1 and a capacitor C5; the main control chip U3 is connected with the base of the transistor Q1 through the resistor R35; the emitter of the transistor Q1 is connected with a 5V input port 43; the collector of the transistor Q1 is connected with the emitter of the transistor Q1 through the resistor R36, the capacitor C6 and the capacitor C5 in sequence; and the buzzer B1 is connected with the capacitor C6 in parallel.

[0061] The main control chip U3 gives a low-level signal to the PNP transistor Q1, and the transistor Q1 is turned on to make the buzzer B1 ring. The resistor R35 plays a role in limiting current, protecting the transistor Q1 from damage by excessive current, and reducing electromagnetic interference. The resistor R36 saturates the transistor Q1, and the resistor R36 also enables the transistor Q1 to enter a saturated state. In the amplification state, as the base current of the transistor Q1 increases, the collector current of the transistor Q1 also increases, resulting in an increase in the voltage across the resistor R36, which in turn reduces the voltage at the collector of the transistor Q1, eventually making the base voltage of the transistor Q1 less than the base voltage of the transistor Q1, so that the transistor Q1 enters a saturated state. The capacitor C6 plays a role in coupling and filtering, and the capacitor C5 plays a role in bypassing the capacitor.

[0062] The multi-channel temperature sensing real-time monitoring system further comprises a row pin J5; the 5V input port 43 is connected with the row pin J5; the row pin J5 is connected with the main control chip U3; and the main control chip U3 is grounded through the capacitor C14; wherein the row pin J5 is connected with different NTC thermistors respectively.

[0063] Specifically, the model of the main control chip U3 is N76E003, which has multiple advantages, including high performance, rich peripheral interfaces, wide working range and high anti-interference capability, and is very suitable for application in various occasions requiring high precision and stability. The J5 row pin is connected with the upper computer, the communication protocol of the upper computer is RS232, the NTC temperature data is sent in real time, the signal control port 6 controls the output of the NAND gate, and the capacitor C14 plays a role in filtering.

[0064] The multi-channel temperature sensing real-time monitoring system described in this embodiment further comprises a first light-emitting LED 1, a second light-emitting LED 2, a resistor R41 and a resistor R42; the positive electrode of the first light-emitting LED 1 and the positive electrode of the second light-emitting LED 2 are respectively connected with a 5V input port 43; the negative electrode of the first light-emitting LED 1 and the negative electrode of the second light-emitting LED 2 are respectively connected with a master control chip U3.

[0065] Specifically, the positive electrode of the light-emitting diode is connected with 5V, and the negative electrode is connected with a resistor. High and low levels are output through the master control chip U3 to control the brightness and extinction of the first light-emitting LED 1 and the first light-emitting LED 2. The state of the test is displayed through this circuit. The resistor R41 and the resistor R42 mainly play the role of current limiting and voltage dividing.

[0066] The core of the innovative technical solution proposed in this embodiment is to use N76E003 chip to build a high-performance and high-integration NTC thermistor temperature measurement device. This chip not only supports wide working voltage and high temperature working environment, but also has excellent anti-interference ability, ensuring the stable operation of the device. The analog-to-digital conversion function is ingeniously integrated inside the control chip, greatly improving the integration and compactness of the system. The controller function of this device is comprehensive, covering switching output, analog quantity acquisition and analog quantity output and other functions. Specifically, the switching output interface can easily connect external devices to realize signal transmission and control; the analog quantity acquisition interface supports up to 32 NTC thermistors to be connected, realizing synchronous monitoring of multiple temperatures; and the analog quantity output interface displays the temperature data of the 32 NTCs in real time through the upper computer, providing users with an intuitive and instant monitoring interface.

[0067] The core of the technical solution is to utilize the close relationship between the resistance value of the thermistor and the temperature. The resistance value of the NTC thermistor decreases with the increase of temperature, and this characteristic is ingeniously used to convert the change of resistance value into the change of temperature, so as to realize accurate temperature measurement. In terms of circuit composition, this device adopts the classic combination of thermistor, ADC acquisition and digital conversion, ensuring the accuracy and stability of temperature measurement.

[0068] In terms of data processing, the scheme adopts an efficient table lookup method. By pre-constructing a lookup table corresponding to the temperature and NTC resistance value, and arranging the data in the table in size order, the system can quickly locate the corresponding temperature value in the table through binary search algorithm after obtaining the NTC resistance value. The lookup efficiency of this method is high, and for a data table of length n, at most log2n lookups are needed to get the result, which significantly improves the temperature measurement speed. At the same time, in order to improve the temperature measurement accuracy, the temperature resolution of the table is carefully designed to meet the needs of the actual application scenario, and linear interpolation can be used to process the values between two adjacent temperature values in the table.

[0069] In terms of configuration, the scheme adopts a ratio configuration, which not only improves the measurement accuracy and stability, but also simplifies the circuit design and reduces the cost. Compared with the prior art, the device is small in size, easy to install, high in function integration, and the measurement accuracy and stability have reached a high level. Using the device, not only the economy can be improved, but also the accuracy and stability of NTC temperature measurement can be met, and the manufacturing cost of the test equipment is reduced, providing a comprehensive and reliable temperature measurement solution for users.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited to the scope of protection of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A multi-channel temperature sensing real-time monitoring system, characterized by: It includes a power module, a first multiplexing chip U1, a second multiplexing chip U2, a main control chip U3, a voltage divider module and a pin header J4; The power supply module is used to supply power to the first multiplexing chip U1, the second multiplexing chip U2, the main control chip U3 and the voltage dividing module; The voltage divider module includes a plurality of voltage divider resistors (2); the first multiplexing chip U1 and the second multiplexing chip U2 are both provided with a plurality of detection channels (3); the pin header J4 is provided with a plurality of connection interfaces (1); each voltage divider resistor (2) is respectively connected to each detection channel (3) and each connection interface (1); The main control chip U3 is electrically connected to the first multiplexing chip U1 and the second multiplexing chip U2 respectively; the main control chip U3 sends signals to the first multiplexing chip U1 and the second multiplexing chip U2 to control the on and off of each detection channel (3).

2. A multi-channel temperature sensing real-time monitoring system according to claim 1, characterized in that: The power supply module comprises a connector J1; the connector J1 is provided with a first positive input port (41), a first negative input port (42) and a 5V input port (43); the first positive input port (41) and the first negative input port (42) are used to supply power to the first multiplexing chip U1 and the second multiplexing chip U2; the 5V input port (43) is used to supply power to the voltage divider module and the main control chip U3; One end of the voltage-dividing resistor (2) is connected to the 5V input port (43); the other end of the voltage-dividing resistor (2) is connected to the detection channel (3) and the connection interface (1), respectively.

3. The multi-channel temperature sensing real-time monitoring system according to claim 2, characterized in that: A diode D3 is provided between the connector J1 and the first positive input port (41); and a diode D4 is provided between the connector J1 and the first negative input port (42).

4. The multi-channel temperature sensing real-time monitoring system according to claim 2, characterized in that: The first multiplexing chip U1 and the second multiplexing chip U2 are both provided with a signal transmission port (5); the signal transmission port (5) is connected to the main control chip U3; the signal transmission port (5) is provided with an RC parallel component.

5. The multi-channel temperature sensing real-time monitoring system according to claim 2, characterized in that: The multi-channel temperature sensing real-time monitoring system further includes a NAND gate module; the main control chip U3 is provided with a signal control port (6); the first multiplexing chip U1 is provided with a first signal receiving port (71); the second multiplexing chip U2 is provided with a second signal receiving port (72); The NAND gate module comprises a resistor R43, a MOS transistor Q4, and a resistor R44; the gate of the MOS transistor Q4 is connected to a signal control port (6); the gate of the MOS transistor Q4 is connected to a source of the MOS transistor Q4 via the resistor R44; the source of the MOS transistor Q4 is grounded; the drain of the MOS transistor Q4 is connected to a 5V input port (43) via the resistor R43; the second signal receiving port (72) is provided between the drain of the MOS transistor Q4 and the resistor R43; and the first signal receiving port (71) is connected to the signal control port (6).

6. The multi-channel temperature sensing real-time monitoring system according to claim 2, characterized in that: The multi-channel temperature sensing real-time monitoring system also includes a first output control module; the first output control module includes a relay RE1, a diode D1, a transistor Q2, a resistor R37 and a resistor R38; The main control chip U3 is connected to the base of the transistor Q2 via a resistor R37; the base of the transistor Q2 is connected to the emitter of the transistor Q2 via a resistor R38; the emitter of the transistor Q2 is grounded; the collector of the transistor Q2 is connected to a 5V input port (43) via a control end of a relay RE1; the control end of the relay RE1 is connected in parallel with a diode D1; and the switch end of the relay RE1 is connected to a connector J1.

7. The multi-channel temperature sensing real-time monitoring system according to claim 2, characterized in that: The multi-channel temperature sensing real-time monitoring system also includes a second output control module; the second output control module includes a relay RE2, a diode D2, a transistor Q3, a resistor R39 and a resistor R40; The main control chip U3 is connected to the base of the transistor Q3 via a resistor R39; the base of the transistor Q3 is connected to the emitter of the transistor Q3 via a resistor R40; the emitter of the transistor Q3 is grounded; the collector of the transistor Q3 is connected to a 5V input port (43) via a control end of a relay RE2; the control end of the relay RE2 is connected in parallel with a diode D2; and the switch end of the relay RE2 is connected to a connector J1.

8. The multi-channel temperature sensing real-time monitoring system according to claim 2, characterized in that: The multi-channel temperature sensing real-time monitoring system also includes a resistor R35, a transistor Q1, a resistor R36, a capacitor C6, a buzzer B1 and a capacitor C5; the main control chip U3 is connected to the base of the transistor Q1 through the resistor R35; the emitter of the transistor Q1 is connected to the 5V input port (43); the collector of the transistor Q1 is connected to the emitter of the transistor Q1 after passing through the resistor R36, the capacitor C6 and the capacitor C5 in sequence; the buzzer B1 is connected in parallel with the capacitor C6.

9. The multi-channel temperature sensing real-time monitoring system according to claim 2, characterized in that: The multi-channel temperature sensing real-time monitoring system further comprises a pin header J5; the 5V input port (43) is connected to the pin header J5; the pin header J5 is connected to the main control chip U3; the main control chip U3 is grounded via a capacitor C14.

10. The multi-channel temperature sensing real-time monitoring system according to claim 2, characterized in that: The multi-channel temperature sensing real-time monitoring system also includes a first light-emitting LED 1, a second light-emitting LED 2, a resistor R41, and a resistor R42; the positive electrode of the first light-emitting LED 1 and the positive electrode of the second light-emitting LED 2 are respectively connected to the 5V input port (43); the negative electrode of the first light-emitting LED 1 and the negative electrode of the second light-emitting LED 2 are respectively connected to the main control chip U3.

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