Temperature control circuit system applied to cesium furnace heating

Abstract

The invention discloses a temperature control circuit system applied to cesium furnace heating, and belongs to the technical field of cesium metal production. Comprising a 220V alternating current power supply, a short circuit protection unit, a direct current voltage stabilization unit, a main control chip, a temperature heating unit, a temperature control unit, a temperature detection unit and an LCD display unit. The short circuit protection unit is electrically connected with the 220V alternating current power supply and the direct current voltage stabilization unit, the temperature heating unit is electrically connected with the main control chip and the cesium furnace, the temperature control unit is electrically connected with the main control chip and the temperature detection unit, and the temperature detection unit is electrically connected with the temperature control unit and the cesium furnace. Heating and cooling of the cesium furnace can be controlled, the constant-temperature state can be maintained, it is guaranteed that metal cesium cannot be condensed into a solid state after being gasified in the cesium furnace, solid cesium is prevented from blocking the interior of a pipeline, and therefore smooth conveying of gaseous cesium by the cesium furnace is guaranteed. The system also rapidly protects the circuit system through the short-circuit protection unit.

Description

Technical Field

[0001] The invention relates to the technical field of cesium metal production, and in particular to a temperature control circuit system used for heating a cesium furnace. Background Art

[0002] Currently, in the process of heating metal cesium production, due to the melting point of cesium is only 28.5 ° C, this characteristic causes cesium to solidify very easily during the condensation process, which in turn causes solid cesium to block the cesium furnace pipeline, affecting the transmission efficiency of cesium. To address this problem, the current treatment strategy mainly relies on direct heating of the cesium furnace. However, this method has difficulty in temperature control, resulting in energy waste. In addition, during the heating process of the cesium furnace, local high temperature may produce a large short-circuit flow, and there is a lack of corresponding safety protection measures, which poses a danger to operators. Summary of the invention

[0003] The purpose of the present invention is to provide a temperature control circuit system for cesium furnace heating, aiming to solve at least one of the technical problems existing in the above-mentioned prior art. To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows:

[0004] A temperature control circuit system for heating a cesium furnace, comprising a 220V AC power supply, a main control chip, a temperature heating unit, a temperature control unit, a temperature detection unit and an LCD display unit; the temperature heating unit is electrically connected to the main control chip and the cesium furnace, the temperature control unit is electrically connected to the main control chip and the temperature detection unit, the temperature detection unit is electrically connected to the temperature control unit and the cesium furnace, and the LCD display unit is electrically connected to the main control chip;

[0005] Among them, the 220V AC power supply is used to power the system, the temperature detection unit is used to detect the real-time temperature of the cesium furnace and transmit the temperature detection signal to the temperature control unit, the temperature control unit is used to send a voltage signal that changes with the temperature to the main control chip according to the received temperature detection signal, the main control chip is used to process the received voltage signal, and convert it into a heating signal and send it to the temperature heating unit, and the temperature heating unit is used to adjust the temperature of the cesium furnace according to the received heating signal.

[0006] As a further solution of the present invention: it also includes a DC voltage stabilizing unit and a short-circuit protection unit, the DC voltage stabilizing unit is electrically connected to the main control chip and the short-circuit protection unit respectively, the short-circuit protection unit is electrically connected to the 220V AC power supply and the DC voltage stabilizing unit respectively, and the DC voltage stabilizing unit is used to convert the AC power of the 220V AC power supply into regulated DC power.

[0007] As a further solution of the present invention: the DC voltage stabilization unit includes a rectifier bridge, an inductor and a DC voltage module, the inductor is connected in series with the rectifier bridge, the DC voltage module includes a No. 1 electrolyte capacitor, a No. 2 electrolyte capacitor, a No. 1 diode and a 7805 chip, the No. 1 electrolyte capacitor, the No. 2 electrolyte capacitor and the No. 1 diode are connected in parallel and connected to the 7805 chip, and the 7805 chip is connected in series with the inductor.

[0008] As a further solution of the present invention: the DC voltage stabilizing unit also includes a No. 2 diode, a No. 3 electrolyte capacitor, a No. 1 filter capacitor and a No. 4 electrolyte capacitor connected in parallel to the DC voltage module.

[0009] As a further solution of the present invention: the short-circuit protection unit includes a diode No. 3, a resistor No. 10, a resistor No. 11, a fuse and a diode No. 4; the anode of the diode No. 3 is connected to the output end of the fuse, the input end of the fuse is connected to the live wire end of the 220V AC power supply, the cathode of the diode No. 3 is connected to the first end of the resistor No. 10, the second end of the resistor No. 10 is connected to the DC voltage stabilizing unit, the first end of the resistor No. 11 is connected to the DC voltage stabilizing unit, the second end of the resistor No. 11 is connected to the anode of the diode No. 4, and the cathode of the diode No. 4 is connected to the neutral wire end of the 220V AC power supply.

[0010] As a further solution of the present invention: the temperature detection unit includes a PT100 thermocouple, the first negative pole of the PT100 thermocouple is connected to the A port of the first wiring terminal, and the other end of the A port of the first wiring terminal is connected to AGND; the second negative pole of the PT100 thermocouple is connected to the B port of the first wiring terminal, and the other end of the B port of the first wiring terminal is connected to the first end of the first resistor, the second end of the first resistor is connected to the negative pole of the chip input end of the first amplifier signal device, and the second end of the first resistor is connected in parallel with the output end of the chip of the first amplifier signal device. Resistor No. 12 and port B of terminal No. 1 also lead out resistor No. 3. Resistor No. 3 is connected to the negative pole of the chip input terminal of amplifier No. 2. The positive pole of the chip input terminal of amplifier No. 2 is connected to filter capacitor No. 2. The other end of filter capacitor No. 2 is connected to AGND. The chip output terminal of amplifier No. 2 is connected to AGND. The positive pole No. 1 of PT100 thermocouple is connected to port C of terminal No. 1. The other end of port C of terminal No. 1 is connected to resistor No. 2. The other end of resistor No. 2 is connected to the positive pole of the chip input terminal of amplifier No. 1.

[0011] As a further solution of the present invention: the temperature control unit includes a high-precision temperature control chip, the TEMP pin of the high-precision temperature control chip is connected to the chip output end of the No. 1 amplifier signal, the VIN pin of the high-precision temperature control chip is connected to a 5V power supply, the GND pin of the high-precision temperature control chip is connected to AGND, a No. 3 filter capacitor and a No. 4 filter capacitor are connected in parallel between the VIN pin and the GND pin, the VOUT pin of the high-precision temperature control chip is electrically connected to the main control chip, the VOUT pin of the high-precision temperature control chip is connected in parallel to a No. 5 filter capacitor, and the other end of the No. 5 filter capacitor is connected to AGND.

[0012] As a further solution of the present invention: the temperature heating unit includes an operational amplifier chip No. 1, a resistor No. 4 is connected in series between the operational amplifier chip No. 1 and the main control chip, the resistor No. 4 is connected to the positive pole of the signal input terminal of the operational amplifier chip No. 1, the negative pole of the signal input terminal of the operational amplifier chip No. 1 is connected to AGND, the V+ interface of the operational amplifier chip No. 1 is connected to a 5V power supply, and a filter capacitor No. 6 is connected in parallel, the other end of the filter capacitor No. 6 is connected to AGND, the signal output port of the operational amplifier chip No. 1 is connected to the resistor No. 5, the other end of the resistor No. 5 is connected to the positive pole of the signal input terminal of the operational amplifier chip No. 2, the negative pole of the signal input terminal of the operational amplifier chip No. 2 is connected to AGND, an adjustable resistor is connected in parallel between the negative pole of the signal input terminal and the signal output terminal of the operational amplifier chip No. 2, the adjustable resistor is connected to a bidirectional thyristor, and the bidirectional thyristor is connected to the D port and the E port of the No. 2 terminal.

[0013] As a further solution of the present invention: the LCD display unit includes a No. 8 resistor, a No. 9 resistor, a light emitting diode and a main touch screen, the main touch screen is connected to the main control chip, the first end of the No. 8 resistor and the first end of the No. 9 resistor are both connected to the main touch screen, the tail end of the No. 8 resistor and the tail end of the No. 9 resistor are commonly connected to the cathode of the light emitting diode, and the anode of the light emitting diode is connected to a 5V power supply.

[0014] Beneficial effects of the present invention:

[0015] (1) The temperature control circuit system of the present invention can not only control the heating and cooling of the cesium furnace, but also maintain the cesium furnace at a constant temperature, ensuring that the metallic cesium will not condense into a solid state after being gasified inside the cesium furnace, thus preventing solid cesium from clogging the inside of the pipeline, thereby ensuring the smooth transportation of gaseous cesium by the cesium furnace;

[0016] (2) The temperature control circuit system involved in the present invention is specially designed for cesium furnace heating applications. It uses PT100 thermocouples for temperature measurement, ensuring the accuracy of temperature detection, and the measurement error is controlled within ±3 degrees Celsius. The system effectively avoids the defect of the traditional temperature feedback range being too large, and exhibits high measurement accuracy and good stability;

[0017] (3) The temperature control circuit system involved in the present invention has the ability to detect abnormally large current when overheating occurs locally or at a single point in the cesium furnace, and can quickly implement protection measures for the circuit system through a short-circuit protection mechanism. Therefore, the system can accurately protect the product from overheating locally or at a single point, and its protection error is also less than ±3 degrees Celsius;

[0018] (4) The temperature control circuit system involved in the present invention integrates multiple safety protection functions such as short circuit protection, anti-interference, protection against thyristor short circuit, protection against main control chip failure or trigger pin damage, etc., thereby providing comprehensive safety protection for the cesium furnace heating process;

[0019] (5) The temperature control circuit system involved in the present invention adopts a modular design scheme, which can easily replace the temperature control circuit board, making installation, debugging and maintenance more convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the structure of a temperature control circuit system used for heating a cesium furnace according to the present invention;

[0022] Figure 2 is a circuit schematic diagram of a temperature control circuit system in an embodiment of the present invention;

[0023] Figure 3 It is a circuit schematic diagram of a DC voltage stabilizing unit and a short-circuit protection unit in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1 As shown, the present invention provides a temperature control circuit system for cesium furnace heating, which at least includes a 220V AC power supply, a short circuit protection unit, a DC voltage stabilizing unit, a main control chip, a temperature heating unit, a temperature control unit, a temperature detection unit and an LCD display unit.

[0026] Wherein, the above-mentioned 220V AC power supply is used to power the entire system, and the above-mentioned short-circuit protection unit is electrically connected to the 220V AC power supply and the DC voltage stabilizing unit, respectively. During operation, if an abnormally large current appears in the circuit system, the system can quickly protect the circuit system through the short-circuit protection unit. The above-mentioned DC voltage stabilizing unit is electrically connected to the main control chip and the short-circuit protection unit, respectively, and the DC voltage stabilizing unit is used to convert the AC power of the 220V AC power supply into stabilized DC power. The above-mentioned temperature detection unit is electrically connected to the temperature control unit and the cesium furnace, respectively, and the temperature detection unit is used to detect the real-time temperature of the cesium furnace and transmit the temperature detection signal to the temperature control unit. The above-mentioned temperature control unit is electrically connected to the main control chip and the temperature detection unit, respectively, and the temperature control unit is used to send a voltage signal that changes with temperature to the main control chip according to the received temperature detection signal, and the voltage signal output by the temperature control unit changes linearly with temperature. The main control chip is used to process the received voltage signal and convert it into a heating signal and send it to the temperature heating unit. The temperature heating unit is electrically connected to the main control chip and the cesium furnace respectively. The temperature heating unit is used to adjust the temperature of the cesium furnace according to the received heating signal. The LCD display unit is electrically connected to the main control chip and is used to display the system working status and the temperature change in the cesium furnace.

[0027] The present invention can not only control the heating and cooling of the cesium furnace, but also maintain the cesium furnace at a constant temperature, ensuring that the metal cesium will not condense into a solid state after being gasified inside the cesium furnace, and preventing solid cesium from blocking the inside of the pipeline, thereby ensuring the smooth transportation of gaseous cesium by the cesium furnace. In addition, during the working process, if an abnormally large current appears in the circuit system, the system can quickly perform circuit-breaking protection on the circuit system through a short-circuit protection unit.

[0028] The following is a detailed description of the important unit modules in this system:

[0029] See also Figure 3As shown, in a specific embodiment, the DC voltage stabilizing unit includes an RS207 rectifier bridge, an inductor and a 5V DC voltage module. The function of the RS207 rectifier bridge is to convert the AC power of the 220V AC power supply into DC power; the No. 1 inductor L1 is connected in series with the RS207 rectifier bridge, and its function is to conduct DC power and suppress AC power; the 5V DC voltage module includes a No. 1 electrolyte capacitor C1, a No. 2 electrolyte capacitor C2 and a No. 1 diode TVS1 connected in parallel, and is connected to the 7805 chip to output a stable 5V DC voltage. Furthermore, the No. 2 diode TVS2, the No. 3 electrolyte capacitor C3, the No. 1 filter capacitor C4 and the No. 4 electrolyte capacitor C5 are connected in parallel to the 5V DC power supply converted from the 220V AC power. The specific connection method is: the cathode of diode No. 2 TVS2, the anode of electrolyte capacitor No. 3 C3 and the anode of electrolyte capacitor No. 4 C5 are all connected to the anode of the 5V DC power supply, while the anode of diode No. 2 TVS2, the anode of electrolyte capacitor No. 3 C3 and the anode of electrolyte capacitor No. 4 C5 are connected to the anode of the 5V DC power supply.

[0030] See also Figure 3 As shown, in a specific embodiment, the short-circuit protection unit includes a diode No. 3 D1, a resistor No. 10 R10, a resistor No. 11 R11 and a diode No. 4 D2. The anode of the diode No. 3 D1 is connected to the output end of the fuse F1, and the output end of the fuse F1 is connected to the live wire end of the 220V AC power supply. The cathode of the diode No. 3 D1 is connected to the first end of the resistor No. 10 R10, and the second end of the resistor No. 10 R10 is connected to the DC voltage stabilizing unit. The first end of the resistor No. 11 R11 is connected to the DC voltage stabilizing unit, the second end of the resistor No. 11 R11 is connected to the anode of the diode No. 4 D2, and the cathode of the diode No. 4 D2 is connected to the neutral wire end of the 220V AC power supply.

[0031] See also Figure 3 As shown in the figure, the system is designed with connection points corresponding to the live and neutral terminals of the 220V AC power supply, namely the live terminal L and the neutral terminal N. The live terminal L and the neutral terminal N can be connected to the 220V AC power supply through a power cord equipped with a power plug. The circuit system has a built-in short-circuit protection unit to improve the safety of the heating element cesium furnace. The short-circuit protector uses a fuse F1, and its input end is connected to the live terminal L. The short-circuit protector can quickly melt when an abnormally large current appears in the circuit system, thereby cutting off the power circuit, preventing the occurrence of high temperature, fire or explosion accidents, and ensuring the safety of the product.

[0032] See also Figure 2As shown, in a specific embodiment, the temperature detection unit 4 includes a voltage-type temperature sensor PT100 thermocouple U1, a No. 1 negative pole J1 of the PT100 thermocouple U1 is connected to the A port of the No. 1 wiring terminal P1, and the other end of the A port is connected to AGND; a No. 2 negative pole J2 of the PT100 thermocouple U1 is connected to the B port of the No. 1 wiring terminal P1, and the other end of the B port of the No. 1 wiring terminal P1 is connected to the No. 1 end of the No. 1 resistor R1, and the No. 2 end of the No. 1 resistor R1 is connected to the negative pole of the input end of the chip U2 of the No. 1 amplifier signal LMP7704, and a No. 12 resistor R12 is also connected in parallel between the No. 2 end of the No. 1 resistor R1 and the output end of the No. 1 amplifier signal LMP7704 chip U2. Port B of terminal P1 No. 1 also leads out resistor R3 No. 3, resistor R3 is connected to the negative input terminal of signal amplifier LMP7704 chip U3 No. 2, the positive input terminal of signal amplifier LMP7704 chip U3 No. 2 is connected to filter capacitor C6 No. 2, the other end of filter capacitor C6 No. 2 is connected to AGND, and output terminal Q of signal amplifier LMP7704 chip U3 No. 2 is connected to AGND; positive pole J3 No. 1 of PT100 thermocouple U1 is connected to port C of terminal P1 No. 1, the other end of port C of terminal P1 No. 1 is connected to resistor R2 No. 2, the other end of resistor R2 is connected to the positive input terminal of signal amplifier LMP7704 chip U2 No. 1.

[0033] The output voltage calculation formula of chip U2 of signal amplifier LMP7704 No. 1 in the signal processing circuit is: [(voltage reference value-voltage sensor value)*(R12+R7)] / R7+voltage sensor value. Among them, the voltage reference value refers to the voltage value provided by the DC voltage regulator unit, the voltage sensor value represents the voltage value output by the PT100 thermocouple, and R7 and R12 represent the resistance values ​​of resistor No. 7 and resistor No. 12 respectively. According to this formula, when the temperature of the cesium furnace rises and the output voltage (voltage sensor value) of the PT100 thermocouple increases, the output voltage of chip U2 of signal amplifier LMP7704 No. 1 will decrease accordingly; conversely, when the temperature of the cesium furnace decreases and the output voltage (voltage sensor value) of the PT100 thermocouple decreases, the output voltage of chip U2 of signal amplifier LMP7704 No. 1 will increase.

[0034] See also Figure 2As shown, in a specific embodiment, the temperature control unit includes a high-precision temperature control chip U4, and the TEMP pin of the high-precision temperature control chip U4 is connected to the output terminal T of the first amplifier LMP7704 chip U2, so that the TEMP pin receives the temperature signal transmitted from the temperature detection unit. The VIN pin of the high-precision temperature control chip U4 is connected to a 5V power supply. The GND pin of the high-precision temperature control chip U4 is connected to AGND, and the third filter capacitor C7 and the fourth filter capacitor C8 are connected in parallel between the VIN pin and the GND pin. The VOUT pin of the high-precision temperature control chip U4 is electrically connected to the main control chip, and the VOUT pin of the high-precision temperature control chip U4 transmits a voltage value to the main control chip, and the output voltage value changes linearly with the temperature. The VOUT pin is connected in parallel to the fifth filter capacitor C9, and the other end of the fifth filter capacitor C9 is connected to AGND.

[0035] See also Figure 2 As shown, in a specific embodiment, the temperature heating unit includes a temperature heating unit receiving a temperature heating signal DAC transmitted from the main control chip 3, the temperature heating signal DAC is connected in series with a No. 4 resistor R4, the other end of the No. 4 resistor R4 is connected to the positive electrode of the signal input terminal of the No. 1 operational amplifier chip U5, and the negative electrode of the signal input terminal of the No. 1 operational amplifier chip U5 is connected to AGND. The V+ interface of the No. 1 operational amplifier chip U5 is connected to a 5V power supply, and a No. 6 filter capacitor C10 is connected in parallel, and the other end of the No. 6 filter capacitor C10 is connected to AGND. The signal output port of the No. 1 operational amplifier chip U5 is connected to the No. 5 resistor R5, and the other end of the No. 5 resistor R5 is connected to the positive electrode of the signal input terminal of the No. 2 operational amplifier chip U6, and the negative electrode of the signal input terminal of the No. 2 operational amplifier chip U6 is connected to AGND. An adjustable resistor R7 is connected in parallel between the negative pole of the signal input terminal and the signal output terminal of the No. 2 operational amplifier chip U6. The other end of the adjustable resistor R7 is connected to the bidirectional thyristor U7. The bidirectional thyristor U7 is then connected to the D port and E port of the No. 2 terminal P2. The E port of the No. 2 terminal P2 is connected to AGND.

[0036] See also Figure 2 As shown, in a specific embodiment, the interface unit circuit of the LCD display unit is composed of a series of electronic components connected in series, specifically including resistor No. 8 R8, resistor No. 9 R9, light emitting diode LED1 and main touch screen. The head end of resistor No. 8 R8 is connected to the main touch screen, and the head end of resistor No. 9 R9 is also connected to the main touch screen. The tail end of resistor No. 8 R8 and the tail end of resistor No. 9 R9 are connected to the cathode of light emitting diode LED1, and the anode of light emitting diode LED1 is connected to a 5V power supply. The interface unit circuit of the main touch screen also has two signal lines, which are connected to the main control chip at the same time.

[0037] The above is a detailed description of the preferred embodiments of the present invention, which cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A temperature control circuit system for cesium furnace heating, characterized in that: It includes a 220V AC power supply, a main control chip, a temperature heating unit, a temperature control unit, a temperature detection unit and an LCD display unit; the temperature heating unit is electrically connected to the main control chip and the cesium furnace respectively, the temperature control unit is electrically connected to the main control chip and the temperature detection unit respectively, the temperature detection unit is electrically connected to the temperature control unit and the cesium furnace respectively, and the LCD display unit is electrically connected to the main control chip; Among them, the 220V AC power supply is used to power the system, the temperature detection unit is used to detect the real-time temperature of the cesium furnace and transmit the temperature detection signal to the temperature control unit, the temperature control unit is used to send a voltage signal that changes with the temperature to the main control chip according to the received temperature detection signal, the main control chip is used to process the received voltage signal, and convert it into a heating signal and send it to the temperature heating unit, and the temperature heating unit is used to adjust the temperature of the cesium furnace according to the received heating signal.

2. A temperature control circuit system for cesium furnace heating according to claim 1, characterized in that: It also includes a DC voltage stabilizing unit and a short-circuit protection unit, wherein the DC voltage stabilizing unit is electrically connected to the main control chip and the short-circuit protection unit respectively, and the short-circuit protection unit is electrically connected to the 220V AC power supply and the DC voltage stabilizing unit respectively, and the DC voltage stabilizing unit is used to convert the AC power of the 220V AC power supply into regulated DC power.

3. A temperature control circuit system for cesium furnace heating according to claim 2, characterized in that: The DC voltage stabilizing unit includes a rectifier bridge, an inductor and a DC voltage module. The inductor is connected in series with the rectifier bridge. The DC voltage module includes a No. 1 electrolyte capacitor, a No. 2 electrolyte capacitor, a No. 1 diode and a 7805 chip. The No. 1 electrolyte capacitor, the No. 2 electrolyte capacitor and the No. 1 diode are connected in parallel and connected to the 7805 chip, and the 7805 chip is connected in series with the inductor.

4. A temperature control circuit system for cesium furnace heating according to claim 3, characterized in that: The DC voltage stabilizing unit also includes a No. 2 diode, a No. 3 electrolyte capacitor, a No. 1 filter capacitor and a No. 4 electrolyte capacitor connected in parallel to the DC voltage module.

5. The temperature control circuit system for cesium furnace heating according to claim 3, characterized in that: The short-circuit protection unit includes diode No. 3, resistor No. 10, resistor No. 11, fuse and diode No. 4; the anode of diode No. 3 is connected to the output end of the fuse, the input end of the fuse is connected to the live wire end of the 220V AC power supply, the cathode of diode No. 3 is connected to the first end of resistor No. 10, the second end of resistor No. 10 is connected to the DC voltage stabilizing unit, the first end of resistor No. 11 is connected to the DC voltage stabilizing unit, the second end of resistor No. 11 is connected to the anode of diode No. 4, and the cathode of diode No. 4 is connected to the neutral wire end of the 220V AC power supply.

6. A temperature control circuit system for cesium furnace heating according to claim 1, characterized in that: The temperature detection unit includes a PT100 thermocouple, wherein the first negative pole of the PT100 thermocouple is connected to the A port of the first wiring terminal, and the other end of the A port of the first wiring terminal is connected to AGND; the second negative pole of the PT100 thermocouple is connected to the B port of the first wiring terminal, and the other end of the B port of the first wiring terminal is connected to the first end of the first resistor, and the second end of the first resistor is connected to the negative pole of the chip input end of the first amplifier signal device, and a No. 12 resistor is also connected in parallel between the second end of the first resistor and the output end of the chip of the first amplifier signal device. Port B of terminal No. 1 also leads out resistor No. 3, which is connected to the negative pole of the chip input terminal of amplifier No. 2, the positive pole of the chip input terminal of amplifier No. 2 is connected to filter capacitor No. 2, the other end of filter capacitor No. 2 is connected to AGND, and the chip output terminal of amplifier No. 2 is connected to AGND; the positive pole No. 1 of the PT100 thermocouple is connected to port C of terminal No. 1, the other end of port C of terminal No. 1 is connected to resistor No. 2, and the other end of resistor No. 2 is connected to the positive pole of the chip input terminal of amplifier No.

1.

7. A temperature control circuit system for cesium furnace heating according to claim 6, characterized in that: The temperature control unit includes a high-precision temperature control chip, a TEMP pin of the high-precision temperature control chip is connected to the chip output end of the No. 1 amplifier signal, a VIN pin of the high-precision temperature control chip is connected to a 5V power supply, a GND pin of the high-precision temperature control chip is connected to AGND, a No. 3 filter capacitor and a No. 4 filter capacitor are connected in parallel between the VIN pin and the GND pin, a VOUT pin of the high-precision temperature control chip is electrically connected to the main control chip, a No. 5 filter capacitor is connected in parallel to the VOUT pin of the high-precision temperature control chip, and the other end of the No. 5 filter capacitor is connected to AGND.

8. A temperature control circuit system for cesium furnace heating according to claim 7, characterized in that: The temperature heating unit includes an operational amplifier chip No. 1, a resistor No. 4 is connected in series between the operational amplifier chip No. 1 and the main control chip, the resistor No. 4 is connected to the positive pole of the signal input terminal of the operational amplifier chip No. 1, the negative pole of the signal input terminal of the operational amplifier chip No. 1 is connected to AGND, the V+ interface of the operational amplifier chip No. 1 is connected to a 5V power supply, and a filter capacitor No. 6 is connected in parallel, the other end of the filter capacitor No. 6 is connected to AGND, the signal output port of the operational amplifier chip No. 1 is connected to the resistor No. 5, the other end of the resistor No. 5 is connected to the positive pole of the signal input terminal of the operational amplifier chip No. 2, the negative pole of the signal input terminal of the operational amplifier chip No. 2 is connected to AGND, an adjustable resistor is connected in parallel between the negative pole of the signal input terminal and the signal output terminal of the operational amplifier chip No. 2, the adjustable resistor is connected to a bidirectional thyristor, and the bidirectional thyristor is connected to the D port and the E port of the No. 2 terminal.

9. The temperature control circuit system for cesium furnace heating according to claim 1, characterized in that: The LCD display unit includes a No. 8 resistor, a No. 9 resistor, a light emitting diode and a main touch screen. The main touch screen is connected to the main control chip. The first end of the No. 8 resistor and the first end of the No. 9 resistor are both connected to the main touch screen. The tail end of the No. 8 resistor and the tail end of the No. 9 resistor are commonly connected to the cathode of the light emitting diode, and the anode of the light emitting diode is connected to a 5V power supply.

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