Temperature control system based on online monitoring sensor

Abstract

The utility model discloses a temperature control system based on an on-line monitoring sensor, which relates to the technical field of temperature control and comprises a power supply module used for supplying power; the temperature detection module is used for temperature detection and is matched with the temperature interval detection module to carry out high-temperature judgment and low-temperature judgment; the resistance value selection module is used for changing the resistance value input into the power regulation module and regulating the frequency of the pulse signal output by the power regulation module when the temperature is about to be high or low; the isolation driving module is used for isolating and transmitting the signal output by the power adjusting module to the heating module; and the heating module is used for normally heating, reducing the heating temperature when the temperature is about to be high, and increasing the heating temperature when the temperature is low. According to the temperature control system based on the on-line monitoring sensor, high-temperature detection and low-temperature detection can be carried out, the heating rate and the heating temperature can be automatically reduced when the temperature is about to be high, and the heating rate and the heating temperature of the heating module can be automatically improved when the temperature is low.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature control, in particular to a temperature control system based on an online monitoring sensor. Background Art

[0002] An online monitoring sensor is a device used to detect and measure specific physical quantities in real time. In a temperature control system, an online monitoring sensor generally uses a temperature sensor, which cooperates with a comparator and a resistor to realize temperature detection, low temperature detection and over-temperature detection. When the temperature is lower than the set low temperature threshold, the heating device is automatically controlled to perform heating treatment. When the temperature is higher than the set over-temperature threshold, the heating work is automatically stopped. However, due to the fixed heating power, the temperature cannot be quickly increased when the temperature is low, and the heating rate cannot be reduced when the temperature is close to the over-temperature threshold. The temperature control efficiency is low, so it needs to be improved. Utility Model Content

[0003] The embodiment of the utility model provides a temperature control system based on an online monitoring sensor to solve the problems raised in the above background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A temperature control system based on an online monitoring sensor, comprising: a power supply module, a temperature detection module, a temperature range detection module, a resistance selection module, a power adjustment module, an isolation drive module and a heating module;

[0006] The power module is used to connect to the mains and perform voltage reduction, rectification and filtering on the mains;

[0007] A temperature detection module, connected to the power module, for performing temperature detection and outputting a temperature signal;

[0008] A temperature interval detection module, connected to the temperature detection module, used to set a high temperature threshold and a low temperature threshold, used to perform voltage drop processing on the high temperature threshold and output a first temperature threshold, output a first control signal when the temperature signal is greater than the first temperature threshold, and output a second control signal when the low temperature threshold is greater than the temperature signal;

[0009] a resistance value selection module, connected to the temperature range detection module and the power regulation module, for providing a first resistance value for the power regulation module, for receiving a first control signal and providing a second resistance value for the power regulation module, for receiving a second control signal and providing a third resistance value for the power regulation module;

[0010] a power regulating module, connected to the power supply module, for receiving a first resistance value and outputting a first pulse signal, for receiving a second resistance value and outputting a second pulse signal, and for receiving a third resistance value and outputting a third pulse signal;

[0011] An isolation driving module, connected to the power regulating module, and used for isolating and transmitting the first pulse signal, the second pulse signal and the third pulse signal to the heating module;

[0012] The heating module is connected to the power supply module and the isolation driving module, and is used to receive the first pulse signal transmitted by the isolation driving module and perform normal heating work, to receive the second pulse signal transmitted by the isolation driving module and reduce the heating temperature and heating rate, and to receive the third pulse signal transmitted by the isolation driving module and increase the heating temperature and heating rate.

[0013] As a further solution of the utility model: the power supply module includes a mains interface, a first transformer, a first rectifier and a first capacitor; the heating module includes a first fuse, a heater and a first thyristor;

[0014] Preferably, the first end of the AC power interface is connected to the first end of the primary side of the first transformer and is connected to the first end of the heater through the first fuse, the second end of the AC power interface is connected to the second end of the primary side of the first transformer and one end of the first thyristor, the other end of the first thyristor is connected to the second end of the heater, the control end of the first thyristor is connected to the drive control module, the first end and the second end of the secondary side of the first transformer are respectively connected to the first end and the second end of the first rectifier, and the third end of the first rectifier is connected to the fourth end of the first rectifier and the ground through the first capacitor.

[0015] As a further solution of the utility model: the temperature detection module includes a first thermistor and an eleventh resistor;

[0016] Preferably, the first end of the first thermistor is connected to the third end of the first rectifier, and the second end of the first thermistor is connected to the temperature interval detection module and grounded through an eleventh resistor.

[0017] As a further solution of the utility model: the power regulation module includes a first oscillator, a second capacitor, a third capacitor, a fifth resistor, a first diode, a fourth resistor and a third resistor;

[0018] Preferably, the fourth end and the eighth end of the first oscillator are both connected to the third end of the first rectifier and connected to the seventh end of the first oscillator and the first end of the fourth resistor through the third resistor, the second end of the fourth resistor is connected to the cathode of the first diode, the anode of the first diode is connected to the resistance selection module and connected to one end of the third capacitor, the second end and the sixth end of the first oscillator through the fifth resistor, the fifth end of the first oscillator is grounded through the second capacitor, the first end of the first oscillator and the other end of the third capacitor are both grounded, and the third end of the first oscillator is connected to the isolation drive module.

[0019] As a further solution of the utility model: the resistance selection module includes a second thyristor, a third thyristor, a fourth thyristor, a sixth resistor, an eighth resistor, a ninth resistor, a seventh resistor, a second diode, a third diode, a first switch tube and a tenth resistor;

[0020] Preferably, the anode of the second thyristor is connected to the anode of the third thyristor, the anode of the fourth thyristor and the seventh end of the first oscillator, the cathode of the second thyristor is connected to the anode of the first diode, one end of the eighth resistor and one end of the ninth resistor through the sixth resistor, the other end of the eighth resistor and the other end of the ninth resistor are respectively connected to the cathode of the third thyristor and the cathode of the fourth thyristor, the control end of the second thyristor is connected to the anode of the second diode, the control end of the third thyristor is connected to the anode of the third diode, the cathode of the third diode and the cathode of the second diode are both connected to the base of the first switching tube through the seventh resistor, the emitter of the first switching tube is grounded, and the collector of the first switching tube is connected to the control end of the third thyristor and connected to the third end of the first rectifier through the tenth resistor.

[0021] As a further solution of the utility model: the temperature range detection module includes a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a fourth diode, a first comparator and a second comparator;

[0022] Preferably, the in-phase end of the first comparator is connected to the inverting end of the second comparator and the second end of the first thermistor, the inverting end of the first comparator is connected to the cathode of the fourth diode, the anode of the fourth diode is connected to one end of the twelfth resistor and grounded through the thirteenth resistor, the in-phase end of the second comparator is connected to one end of the fourteenth resistor and grounded through the fifteenth resistor, the other end of the fourteenth resistor and the other end of the twelfth resistor are both connected to the third end of the first rectifier, and the output end of the first comparator and the output end of the second comparator are respectively connected to the control end of the third thyristor and the control end of the second thyristor.

[0023] As a further solution of the utility model: the isolation driving module includes a second resistor, a first optical coupler and a first resistor;

[0024] Preferably, the IN1 end of the first optocoupler is connected to the third end of the first oscillator through the second resistor, the OUT1 end of the first optocoupler is grounded, the IN2 end of the first optocoupler is connected to the second end of the heater through the first resistor, and the OUT2 end of the first optocoupler is connected to the control end of the first thyristor.

[0025] Compared with the prior art, the beneficial effects of the utility model are as follows: the temperature control system based on the online monitoring sensor of the utility model performs temperature detection by the temperature detection module, and performs high temperature detection and low temperature detection by the temperature range detection module. When the temperature is not about to reach high temperature or low temperature, the resistance selection module cooperates with the power regulation module and the isolation drive module to control the heating module to perform normal heating work. When the temperature is about to reach high temperature, the resistance selection module changes the resistance value of the input power regulation module, thereby reducing the heating rate of the heating module. At low temperature, the resistance selection module cooperates with the power regulation module and the isolation drive module to control the heating module to increase the heating rate of the heating module, thereby improving the temperature control efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0027] Figure 1 The present invention provides a schematic block diagram of a temperature control system based on an online monitoring sensor.

[0028] Figure 2 A circuit diagram of a temperature control system based on an online monitoring sensor provided in an example of the utility model.

[0029] Figure 3 This is a connection circuit diagram of the temperature range detection module provided by the example of the utility model. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In one embodiment, see Figure 1, a temperature control system based on an online monitoring sensor, comprising: a power supply module 1, a temperature detection module 2, a temperature range detection module 3, a resistance selection module 4, a power adjustment module 5, an isolation drive module 6 and a heating module 7;

[0032] Specifically, the power supply module 1 is used to access the mains power and perform voltage reduction, rectification and filtering on the mains power;

[0033] A temperature detection module 2, connected to the power module 1, for performing temperature detection and outputting a temperature signal;

[0034] A temperature interval detection module 3, connected to the temperature detection module 2, for setting a high temperature threshold and a low temperature threshold, for performing a voltage drop process on the high temperature threshold and outputting a first temperature threshold, outputting a first control signal when the temperature signal is greater than the first temperature threshold, and outputting a second control signal when the low temperature threshold is greater than the temperature signal;

[0035] a resistance value selection module 4, connected to the temperature range detection module 3 and the power regulation module 5, for providing a first resistance R1 value for the power regulation module 5, for receiving a first control signal and providing a second resistance R2 value for the power regulation module 5, and for receiving a second control signal and providing a third resistance R3 value for the power regulation module 5;

[0036] A power regulating module 5, connected to the power supply module 1, for receiving the value of the first resistor R1 and outputting a first pulse signal, for receiving the value of the second resistor R2 and outputting a second pulse signal, and for receiving the value of the third resistor R3 and outputting a third pulse signal;

[0037] an isolation driving module 6, connected to the power regulating module 5, and configured to isolate and transmit the first pulse signal, the second pulse signal and the third pulse signal to the heating module 7;

[0038] The heating module 7 is connected to the power supply module 1 and the isolation driving module 6, and is used to receive the first pulse signal transmitted by the isolation driving module 6 and perform normal heating work, to receive the second pulse signal transmitted by the isolation driving module 6 and reduce the heating temperature and heating rate, and to receive the third pulse signal transmitted by the isolation driving module 6 and increase the heating temperature and heating rate.

[0039] In a specific embodiment, the power supply module 1 can adopt a power supply circuit composed of a mains interface, a transformer, a rectifier and a capacitor, can be connected to the mains, and perform voltage reduction, rectification and filtering on the mains; the temperature detection module 2 can adopt a temperature detection circuit composed of a thermistor and a resistor, perform temperature detection and output the temperature signal in the form of an electrical signal; the temperature interval detection module 3 can adopt a temperature interval detection circuit composed of a resistor, a diode and a comparator, can set a high temperature threshold and a low temperature threshold, and perform a voltage drop process on the high temperature threshold to obtain a first temperature threshold, perform an upcoming high temperature judgment, and perform a low temperature judgment by the low temperature threshold; the resistor The value selection module 4 can adopt a resistance selection circuit composed of thyristors, resistors, diodes, etc., which can adjust the resistance value of the input power regulation module 5, and then adjust the frequency of the signal output by the power regulation module 5; the above-mentioned power regulation module 5 can adopt a power regulation circuit composed of an oscillator, a capacitor, a diode and a resistor to provide a pulse signal; the above-mentioned isolation drive module 6 can adopt an isolation drive circuit composed of a photocoupler and a resistor to isolate the transmission signal; the above-mentioned heating module 7 can adopt a heating circuit composed of a heater, a thyristor and a fuse to perform heating work, and adjust the heating temperature and heating rate according to the frequency of the signal transmitted by the isolated transmission signal.

[0040] In another embodiment, see Figure 1 , Figure 2 and Figure 3 The power module 1 includes a mains interface, a first transformer B1, a first rectifier T1 and a first capacitor C1; the heating module 7 includes a first fuse FU1, a heater and a first thyristor SCR1;

[0041] Specifically, the first end of the AC power interface is connected to the first end of the primary side of the first transformer B1 and is connected to the first end of the heater through the first fuse FU1, the second end of the AC power interface is connected to the second end of the primary side of the first transformer B1 and one end of the first thyristor SCR1, the other end of the first thyristor SCR1 is connected to the second end of the heater, the control end of the first thyristor SCR1 is connected to the drive control module, the first end and the second end of the secondary side of the first transformer B1 are respectively connected to the first end and the second end of the first rectifier T1, and the third end of the first rectifier T1 is connected to the fourth end of the first rectifier T1 and the ground through the first capacitor C1.

[0042] In a specific embodiment, the heater may be an electric heater; the first thyristor SCR1 may be a bidirectional thyristor.

[0043] Further, the temperature detection module 2 includes a first thermistor NTC and an eleventh resistor R11;

[0044] Specifically, a first end of the first thermistor NTC is connected to the third end of the first rectifier T1 , and a second end of the first thermistor NTC is connected to the temperature interval detection module 3 and grounded through the eleventh resistor R11 .

[0045] In a specific embodiment, the first thermistor NTC can be a thermistor with a negative temperature coefficient.

[0046] Further, the power regulation module 5 includes a first oscillator IC1, a second capacitor C2, a third capacitor C3, a fifth resistor R5, a first diode D1, a fourth resistor R4 and a third resistor R3;

[0047] Specifically, the fourth end and the eighth end of the first oscillator IC1 are connected to the third end of the first rectifier T1 and connected to the seventh end of the first oscillator IC1 and the first end of the fourth resistor R4 through the third resistor R3, the second end of the fourth resistor R4 is connected to the cathode of the first diode D1, the anode of the first diode D1 is connected to the resistance selection module 4 and connected to one end of the third capacitor C3, the second end and the sixth end of the first oscillator IC1 through the fifth resistor R5, the fifth end of the first oscillator IC1 is grounded through the second capacitor C2, the first end of the first oscillator IC1 and the other end of the third capacitor C3 are both grounded, and the third end of the first oscillator IC1 is connected to the isolation drive module 6.

[0048] In a specific embodiment, the first oscillator IC1 may be a NE555 chip.

[0049] Further, the resistance value selection module 4 includes a second thyristor SCR2, a third thyristor SCR3, a fourth thyristor SCR4, a sixth resistor R6, an eighth resistor R8, a ninth resistor R9, a seventh resistor R7, a second diode D2, a third diode D3, a first switch tube VT1 and a tenth resistor R10;

[0050] Specifically, the anode of the second thyristor SCR2 is connected to the anode of the third thyristor SCR3, the anode of the fourth thyristor SCR4 and the seventh end of the first oscillator IC1, the cathode of the second thyristor SCR2 is connected to the anode of the first diode D1, one end of the eighth resistor R8 and one end of the ninth resistor R9 through the sixth resistor R6, the other end of the eighth resistor R8 and the other end of the ninth resistor R9 are respectively connected to the cathode of the third thyristor SCR3 and the cathode of the fourth thyristor SCR4, the control end of the second thyristor SCR2 is connected to the anode of the second diode D2, the control end of the third thyristor SCR3 is connected to the anode of the third diode D3, the cathode of the third diode D3 and the cathode of the second diode D2 are both connected to the base of the first switching tube VT1 through the seventh resistor R7, the emitter of the first switching tube VT1 is grounded, the collector of the first switching tube VT1 is connected to the control end of the third thyristor SCR3 and is connected to the third end of the first rectifier T1 through the tenth resistor R10.

[0051] In a specific embodiment, the second thyristor SCR2, the third thyristor SCR3 and the fourth thyristor SCR4 can all be unidirectional thyristors, wherein the resistance of the eighth resistor R8 is greater than the resistance of the ninth resistor R9, and the resistance of the ninth resistor R9 is greater than the resistance of the sixth resistor R6.

[0052] Further, the temperature interval detection module 3 includes a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a fourth diode D4, a first comparator A1 and a second comparator A2;

[0053] Specifically, the in-phase end of the first comparator A1 is connected to the inverting end of the second comparator A2 and the second end of the first thermistor NTC, the inverting end of the first comparator A1 is connected to the cathode of the fourth diode D4, the anode of the fourth diode D4 is connected to one end of the twelfth resistor R12 and grounded through the thirteenth resistor R13, the in-phase end of the second comparator A2 is connected to one end of the fourteenth resistor R14 and grounded through the fifteenth resistor R15, the other end of the fourteenth resistor R14 and the other end of the twelfth resistor R12 are both connected to the third end of the first rectifier T1, and the output end of the first comparator A1 and the output end of the second comparator A2 are respectively connected to the control end of the third thyristor SCR3 and the control end of the second thyristor SCR2.

[0054] In a specific embodiment, the twelfth resistor R12 and the thirteenth resistor R13 provide a high temperature threshold, and then the fourth diode D4 performs voltage drop processing; the fourteenth resistor R14 and the fifteenth resistor R15 provide a low temperature threshold; the first comparator A1 and the second comparator A2 can both use LM358 comparators.

[0055] Further, the isolation driving module 6 includes a second resistor R2, a first optical coupler IC2 and a first resistor R1;

[0056] Specifically, the IN1 end of the first optocoupler IC2 is connected to the third end of the first oscillator IC1 through the second resistor R2, the OUT1 end of the first optocoupler IC2 is grounded, the IN2 end of the first optocoupler IC2 is connected to the second end of the heater through the first resistor R1, and the OUT2 end of the first optocoupler IC2 is connected to the control end of the first thyristor SCR1.

[0057] In a specific embodiment, the first optical coupler IC2 can be a TLP3502 optical coupler.

[0058] In a temperature control system based on an online monitoring sensor in this embodiment, the mains is connected to the mains by a mains interface, the first transformer B1 performs a voltage reduction process, the first rectifier T1 and the first capacitor C1 perform a rectification and filtering process, the first thermistor NTC performs temperature detection, and cooperates with the eleventh resistor R11 to output a temperature signal. When the temperature does not exceed the first temperature threshold provided by the twelfth resistor R12, the thirteenth resistor R13 and the fourth diode D4, and is not lower than the low temperature threshold set by the fourteenth resistor R14 and the fifteenth resistor R15, the tenth resistor R10 triggers the third thyristor SCR3 to turn on, and the ninth resistor R9 is connected and cooperates with the third resistor R3, the fourth resistor R4, the first diode D1, the fifth resistor R5, the third capacitor C3, and the first oscillator. IC1 and the second capacitor C2 perform oscillation and output a first pulse signal, which is isolated and transmitted by the first optocoupler IC2 and drives the first thyristor SCR1 to turn on, thereby controlling the heating operation of the heater. When the temperature signal is greater than the first temperature threshold, the temperature is about to exceed the set high temperature range, and the first comparator A1 outputs a high level and controls the third thyristor SCR3 to turn on. At this time, the eighth resistor R8 is connected to reduce the frequency of the first pulse signal output by the first oscillator IC1, that is, output the second pulse signal, and then reduce the heating temperature and heating rate of the heater. When the temperature signal is lower than the low temperature threshold, the frequency of the first pulse signal output by the first oscillator IC1 is increased, that is, the third pulse signal is output, and then the heating temperature and heating rate of the heater are increased.

[0059] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0060] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A temperature control system based on an online monitoring sensor, characterized in that: The temperature control system based on the online monitoring sensor includes: a power supply module, a temperature detection module, a temperature range detection module, a resistance selection module, a power adjustment module, an isolation drive module and a heating module; The power supply module is used to access the mains power and perform voltage reduction, rectification and filtering on the mains power; The temperature detection module is connected to the power supply module and is used to perform temperature detection and output a temperature signal; The temperature interval detection module is connected to the temperature detection module, and is used to set a high temperature threshold and a low temperature threshold, and is used to perform a voltage drop process on the high temperature threshold and output a first temperature threshold, and output a first control signal when the temperature signal is greater than the first temperature threshold, and output a second control signal when the low temperature threshold is greater than the temperature signal; The resistance value selection module is connected to the temperature range detection module and the power regulation module, and is used to provide a first resistance value for the power regulation module, to receive a first control signal and provide a second resistance value for the power regulation module, and to receive a second control signal and provide a third resistance value for the power regulation module; The power regulating module is connected to the power supply module, and is used to receive a first resistance value and output a first pulse signal, to receive a second resistance value and output a second pulse signal, and to receive a third resistance value and output a third pulse signal; The isolation driving module is connected to the power regulating module and is used to isolate and transmit the first pulse signal, the second pulse signal and the third pulse signal to the heating module; The heating module is connected to the power supply module and the isolation driving module, and is used to receive the first pulse signal transmitted by the isolation driving module and perform normal heating work, to receive the second pulse signal transmitted by the isolation driving module and reduce the heating temperature and heating rate, and to receive the third pulse signal transmitted by the isolation driving module and increase the heating temperature and heating rate.

2. A temperature control system based on an online monitoring sensor according to claim 1, characterized in that: The power supply module includes a mains interface, a first transformer, a first rectifier and a first capacitor; the heating module includes a first fuse, a heater and a first thyristor; The first end of the AC power interface is connected to the first end of the primary side of the first transformer and is connected to the first end of the heater through the first fuse, the second end of the AC power interface is connected to the second end of the primary side of the first transformer and one end of the first thyristor, the other end of the first thyristor is connected to the second end of the heater, the control end of the first thyristor is connected to the drive control module, the first end and the second end of the secondary side of the first transformer are respectively connected to the first end and the second end of the first rectifier, and the third end of the first rectifier is connected to the fourth end of the first rectifier and the ground through the first capacitor.

3. A temperature control system based on an online monitoring sensor according to claim 2, characterized in that: The temperature detection module includes a first thermistor and an eleventh resistor; The first end of the first thermistor is connected to the third end of the first rectifier, and the second end of the first thermistor is connected to the temperature interval detection module and grounded through an eleventh resistor.

4. A temperature control system based on an online monitoring sensor according to claim 3, characterized in that: The power regulation module includes a first oscillator, a second capacitor, a third capacitor, a fifth resistor, a first diode, a fourth resistor and a third resistor; The fourth end and the eighth end of the first oscillator are connected to the third end of the first rectifier and connected to the seventh end of the first oscillator and the first end of the fourth resistor through the third resistor, the second end of the fourth resistor is connected to the cathode of the first diode, the anode of the first diode is connected to the resistance selection module and connected to one end of the third capacitor, the second end and the sixth end of the first oscillator through the fifth resistor, the fifth end of the first oscillator is grounded through the second capacitor, the first end of the first oscillator and the other end of the third capacitor are both grounded, and the third end of the first oscillator is connected to the isolation drive module.

5. A temperature control system based on an online monitoring sensor according to claim 4, characterized in that: The resistance value selection module includes a second thyristor, a third thyristor, a fourth thyristor, a sixth resistor, an eighth resistor, a ninth resistor, a seventh resistor, a second diode, a third diode, a first switch tube and a tenth resistor; The anode of the second thyristor is connected to the anode of the third thyristor, the anode of the fourth thyristor and the seventh end of the first oscillator, the cathode of the second thyristor is connected to the anode of the first diode, one end of the eighth resistor and one end of the ninth resistor through the sixth resistor, the other end of the eighth resistor and the other end of the ninth resistor are respectively connected to the cathode of the third thyristor and the cathode of the fourth thyristor, the control end of the second thyristor is connected to the anode of the second diode, the control end of the third thyristor is connected to the anode of the third diode, the cathode of the third diode and the cathode of the second diode are both connected to the base of the first switching tube through the seventh resistor, the emitter of the first switching tube is grounded, and the collector of the first switching tube is connected to the control end of the third thyristor and connected to the third end of the first rectifier through the tenth resistor.

6. A temperature control system based on an online monitoring sensor according to claim 5, characterized in that: The temperature interval detection module includes a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a fourth diode, a first comparator and a second comparator; The non-inverting end of the first comparator is connected to the inverting end of the second comparator and the second end of the first thermistor, the inverting end of the first comparator is connected to the cathode of the fourth diode, the anode of the fourth diode is connected to one end of the twelfth resistor and grounded through the thirteenth resistor, the non-inverting end of the second comparator is connected to one end of the fourteenth resistor and grounded through the fifteenth resistor, the other end of the fourteenth resistor and the other end of the twelfth resistor are both connected to the third end of the first rectifier, and the output end of the first comparator and the output end of the second comparator are respectively connected to the control end of the third thyristor and the control end of the second thyristor.

7. A temperature control system based on an online monitoring sensor according to claim 4, characterized in that: The isolation driving module includes a second resistor, a first optical coupler and a first resistor; The IN1 end of the first optocoupler is connected to the third end of the first oscillator through the second resistor, the OUT1 end of the first optocoupler is grounded, the IN2 end of the first optocoupler is connected to the second end of the heater through the first resistor, and the OUT2 end of the first optocoupler is connected to the control end of the first thyristor.

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