Novel high and low temperature automatic control circuit

Abstract

The utility model discloses a novel high and low temperature automatic control circuit, relates to the technical field of intelligent detection and control, and aims to solve the problems of poor temperature control precision, complex logic circuit and more faults in the temperature control process of a cooling chamber of a diesel engine of an existing internal combustion locomotive. According to the key points of the technical scheme, the device comprises a power supply processing module, a high-temperature test numerical value unit, a low-temperature test numerical value unit, a high-temperature temperature value setting unit, a low-temperature temperature value setting unit, a single-chip microcomputer processing unit, a fan starting control unit, a fan closing control unit, a high-temperature numerical value display unit and a low-temperature numerical value display unit, a high-voltage 110V DC is converted into a low-voltage DC power supply which is used for working of a single-chip microcomputer and other circuits; and the low-temperature test numerical value unit is used for processing a temperature sensor signal for testing low temperature into a standard electric signal to be processed by the single chip microcomputer. The effects of simplifying the circuit and reducing the failure rate are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to intelligent detection and control technical field especially is related to a novel high and low temperature automatic control circuit. BACKGROUND

[0002] The temperature control of the cooling chamber of the diesel engine of the diesel locomotive is directly related to the working state and the use safety of the diesel engine, and the excessively high or low ambient temperature is not conducive to the normal work of the diesel engine. In the traditional control mode, the ambient temperature is collected by a temperature sensor, and the temperature display and the temperature control are realized through the processing and control of a logic circuit. The temperature control of the cooling chamber of the diesel engine of the diesel locomotive is a key link for ensuring the efficient and stable operation of the diesel engine. A large amount of heat is generated during the work of the diesel engine. If the cooling is insufficient, the components will be overheated, the performance will be reduced, and even the components will be damaged. If the cooling is excessive, the thermal efficiency will be reduced, and the energy consumption will be increased.

[0003] The prior art scheme has the following defects: in the temperature control process of the cooling chamber of the diesel engine of the diesel locomotive, the temperature control precision is poor, the logic circuit is complex, and the faults are more. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a novel high and low temperature automatic control circuit.

[0005] In order to realize the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A novel high and low temperature automatic control circuit, including power processing module, high temperature test numerical unit, low temperature test numerical unit, set high temperature temperature value unit, set low temperature temperature value unit, singlechip processing unit, control fan opening unit, control fan closing unit, high temperature numerical display unit and low temperature numerical display unit, the power processing module, high voltage 110V DC is converted into low voltage DC power supply, and singlechip and other circuit work use are provided for;

[0007] The high temperature test numerical unit processes the temperature sensor signal of the test high temperature into a standard electric signal for the singlechip processing.

[0008] The low temperature test numerical unit processes the temperature sensor signal of the test low temperature into a standard electric signal for the singlechip processing.

[0009] The set high temperature temperature value unit sets the high temperature detection comparison value in advance.

[0010] The set low temperature temperature value unit sets the low temperature detection comparison value in advance.

[0011] The singlechip processing unit collects data, analyzes data and controls a relay and a nixie tube.

[0012] The control fan opening unit opens the fan through a relay to dissipate heat and reduce temperature;

[0013] The control fan closing unit closes the fan through a relay to stop dissipating heat and reducing temperature;

[0014] The high-temperature value display unit displays the temperature detected by a high-temperature sensor;

[0015] The low-temperature value display unit displays the temperature detected by a low-temperature sensor.

[0016] In the temperature control process of the diesel engine cooling chamber of the diesel locomotive, the cooling system is divided into high-temperature and low-temperature circulating water systems due to the cooling liquid circulation requirement of the cooling series. In the process of collecting temperature data, the high-temperature and low-temperature systems must be detected independently through the high-temperature and low-temperature parts.

[0017] The single-chip microcomputer embedded programming method is introduced to simplify the logic circuit. The single-chip microcomputer analyzes and processes the input signals of the temperature sensor, controls the on-off of the relay, realizes high-temperature heating and low-temperature heat dissipation, and displays the real-time test temperature through the single-chip microcomputer control digital tube.

[0018] Further, the power supply processing module includes a polarity protection diode D1, a DC-DC voltage reduction module PS1, a filter module C5, and a three-terminal voltage stabilizing tube U3.

[0019] The 2-pin of the DC-DC voltage reduction module PS1 is electrically connected with one end of the polarity protection diode D1, the 3-pin of the DC-DC voltage reduction module PS1 is grounded, the 4-pin of the DC-DC voltage reduction module PS1, one end of the filter module C5, and the 1-pin of the three-terminal voltage stabilizing tube U3 are electrically connected, the other end of the filter module C5 is grounded, and the 2-pin of the three-terminal voltage stabilizing tube U3 is grounded.

[0020] Through the above technical solution, D1 is a polarity protection diode, which prevents the positive and negative ports of the power supply from being connected in reverse; PS1 is a DC-DC voltage reduction module, which converts high voltage into low voltage for use by the circuit board; C5 is a filter module, which mainly filters low frequency; and U3 is a three-terminal voltage stabilizing tube, which stably outputs voltage for use by the circuit board.

[0021] Further, the high-temperature test value unit includes a temperature sensor TR1, an input resistor R2, an up-pull bias resistor R5, an adjustable potentiometer RV2, a zero-adjusting voltage dividing resistor R8, a zero-adjusting voltage dividing resistor R9, a gain control resistor R11, a temperature sensor dedicated processing integrated circuit U2, a power supply filter capacitor C4, and an output resistor R13.

[0022] The 1st pin of the temperature sensor special processing integrated circuit U2 and the 2nd pin of the adjustable potentiometer RV2 are electrically connected, the 2nd pin of the temperature sensor special processing integrated circuit U2 and one end of the gain control resistor R11 are electrically connected, the 3rd pin of the temperature sensor special processing integrated circuit U2 and the other end of the gain control resistor R11 are electrically connected, the 4th pin of the temperature sensor special processing integrated circuit U2, one end of the pull-up bias resistor R5 and one end of the input resistor R2 are electrically connected, the other end of the input resistor R2 and one end of the temperature sensor TR1 are electrically connected, the other end of the temperature sensor TR1 is grounded, the 5th pin and the 6th pin of the temperature sensor special processing integrated circuit U2 are grounded, the 7th pin of the temperature sensor special processing integrated circuit U2 and one end of the output resistor R13 are electrically connected, the 8th pin of the temperature sensor special processing integrated circuit U2 and one end of the power filter capacitor C4 are electrically connected, the other end of the power filter capacitor C4 is grounded, the 3rd pin of the adjustable potentiometer RV2 and one end of the zero-adjusting voltage dividing resistor R8 are electrically connected, the 1st pin of the adjustable potentiometer RV2 and one end of the zero-adjusting voltage dividing resistor R9 are electrically connected, the other end of the zero-adjusting voltage dividing resistor R9 is grounded.

[0023] By adopting the technical scheme, TR1 is a temperature sensor for detecting the ambient temperature, and RV2 is an adjustable potentiometer for adjusting the zero position.

[0024] Further, the low-temperature test value unit comprises a temperature sensor TR2, an input resistor R3, a pull-up bias resistor R4, an adjustable potentiometer RV1, a zero-adjusting voltage dividing resistor R6, a zero-adjusting voltage dividing resistor R7, a gain control resistor R10, a temperature sensor special processing integrated circuit U1 and an output resistor R12.

[0025] The 1st pin of the temperature sensor special processing integrated circuit U1 and the 2nd pin of the adjustable potentiometer RV1 are electrically connected, the 2nd pin of the temperature sensor special processing integrated circuit U1 and one end of the gain control resistor R10 are electrically connected, the 3rd pin of the temperature sensor special processing integrated circuit U1 and the other end of the gain control resistor R10 are electrically connected, the 4th pin of the temperature sensor special processing integrated circuit U1, one end of the pull-up bias resistor R4 and one end of the input resistor R3 are electrically connected, the other end of the input resistor R3 and one end of the temperature sensor TR2 are electrically connected, the other end of the temperature sensor TR2 is grounded, the 5th pin and the 6th pin of the temperature sensor special processing integrated circuit U1 are grounded, the 7th pin of the temperature sensor special processing integrated circuit U1 and one end of the output resistor R12 are electrically connected, the 3rd pin of the adjustable potentiometer RV1 and one end of the zero-adjusting voltage dividing resistor R6 are electrically connected, the 1st pin of the adjustable potentiometer RV1 and one end of the zero-adjusting voltage dividing resistor R7 are electrically connected, the other end of the zero-adjusting voltage dividing resistor R7 is grounded.

[0026] Through adoption of the above technical scheme, TR2 is a temperature sensor, detecting ambient temperature, and RV1 is an adjustable potentiometer, adjusting zero position.

[0027] Further, the single-chip processing unit comprises a crystal oscillator Y1, a crystal oscillator compensation capacitor C8, a crystal oscillator compensation capacitor C9, a single-chip circuit IC1, an adjustable potentiometer RV4 and an adjustable potentiometer RV3.

[0028] The 6th pin of the single-chip circuit IC1, one end of the crystal oscillator Y1 and one end of the crystal oscillator compensation capacitor C8 are electrically connected, the other end of the crystal oscillator compensation capacitor C8 is grounded, the 7th pin of the single-chip circuit IC1, the other end of the crystal oscillator Y1 and one end of the crystal oscillator compensation capacitor C9 are electrically connected, the other end of the crystal oscillator compensation capacitor C9 is grounded, the 14th pin of the single-chip circuit IC1 is grounded, the 18th pin of the single-chip circuit IC1 and the 2nd pin of the adjustable potentiometer RV3 are electrically connected, the 3rd pin of the adjustable potentiometer RV3 is grounded, the 19th pin of the single-chip circuit IC1 and the 2nd pin of the adjustable potentiometer RV4 are electrically connected, and the 3rd pin of the adjustable potentiometer RV4 is grounded.

[0029] Through adoption of the above technical scheme, Y1 is a crystal oscillator, providing an external oscillation frequency for the single-chip, RV4 is an adjustable potentiometer for adjusting low-temperature reference voltage, and RV3 is an adjustable potentiometer for adjusting high-temperature reference voltage.

[0030] Further, the digital tube input resistors R24, R25, R26, R27, R28, R29, R30, R31, the digital tube U5, the power drive transistors Q2, Q4, Q6, the base-stage resistors R33, R35 and R37.

[0031] The 11-pin of the nixie tube U5 is electrically connected with one end of the nixie tube input resistor R24, the 7-pin of the nixie tube U5 is electrically connected with one end of the nixie tube input resistor R25, the 4-pin of the nixie tube U5 is electrically connected with one end of the nixie tube input resistor R26, the 2-pin of the nixie tube U5 is electrically connected with one end of the nixie tube input resistor R27, the 1-pin of the nixie tube U5 is electrically connected with one end of the nixie tube input resistor R28, the 10-pin of the nixie tube U5 is electrically connected with one end of the nixie tube input resistor R29, the 5-pin of the nixie tube U5 is electrically connected with one end of the nixie tube input resistor R30, the 3-pin of the nixie tube U5 is electrically connected with one end of the nixie tube input resistor R31, the 12-pin of the nixie tube U5 is electrically connected with the 3-pin of the power drive transistor Q2, the 1-pin of the power drive transistor Q2 is electrically connected with one end of the base resistor R33, the 9-pin of the nixie tube U5 is electrically connected with the 3-pin of the power drive transistor Q4, the 1-pin of the power drive transistor Q4 is electrically connected with one end of the base resistor R35, the 8-pin of the nixie tube U5 is electrically connected with the 3-pin of the power drive transistor Q6, the 1-pin of the power drive transistor Q6 is electrically connected with one end of the base resistor R37, the other end of the base resistor R33 is electrically connected with the 22-pin of the single-chip microcomputer circuit IC1, the other end of the base resistor R35 is electrically connected with the 23-pin of the single-chip microcomputer circuit IC1, and the other end of the base resistor R37 is electrically connected with the 24-pin of the single-chip microcomputer circuit IC1.

[0032] By adopting the above technical scheme, U5 is a nixie tube, which is used for displaying the set temperature and the real-time display temperature.

[0033] Further, the low-temperature value display unit comprises a nixie tube input resistor R15, a nixie tube input resistor R16, a nixie tube input resistor R17, a nixie tube input resistor R18, a nixie tube input resistor R19, a nixie tube input resistor R20, a nixie tube input resistor R21, a nixie tube input resistor R22, a nixie tube U6, a power drive transistor Q1, a power drive transistor Q3, a power drive transistor Q5, a base resistor R32, a base resistor R34 and a base resistor R36.

[0034] The 11-pin of the nixie tube U6 is electrically connected with one end of the nixie tube input resistor R15, the 7-pin of the nixie tube U6 is electrically connected with one end of the nixie tube input resistor R16, the 4-pin of the nixie tube U6 is electrically connected with one end of the nixie tube input resistor R17, the 2-pin of the nixie tube U6 is electrically connected with one end of the nixie tube input resistor R18, the 1-pin of the nixie tube U6 is electrically connected with one end of the nixie tube input resistor R19, the 10-pin of the nixie tube U6 is electrically connected with one end of the nixie tube input resistor R20, the 5-pin of the nixie tube U6 is electrically connected with one end of the nixie tube input resistor R21, the 3-pin of the nixie tube U6 is electrically connected with one end of the nixie tube input resistor R22, the 12-pin of the nixie tube U6 is electrically connected with the 3-pin of the power drive triode Q1, the 1-pin of the power drive triode Q1 is electrically connected with one end of the base resistor R32, the 9-pin of the nixie tube U6 is electrically connected with the 3-pin of the power drive triode Q3, the 1-pin of the power drive triode Q3 is electrically connected with one end of the base resistor R34, the 8-pin of the nixie tube U6 is electrically connected with the 3-pin of the power drive triode Q5, the 1-pin of the power drive triode Q5 is electrically connected with one end of the base resistor R36, the other end of the base resistor R32 is electrically connected with the 25-pin of the single-chip microcomputer circuit IC1, the other end of the base resistor R34 is electrically connected with the 9-pin of the single-chip microcomputer circuit IC1, and the other end of the base resistor R36 is electrically connected with the 10-pin of the single-chip microcomputer circuit IC1.

[0035] By adopting the technical scheme, the U6 is a nixie tube, which is used for displaying the set temperature and the real-time display temperature.

[0036] Further, the control fan opening unit comprises a low-voltage control circuit current drive triode Q10, a base resistor R39 of the Q10 triode, a triode bias resistor R44, a base resistor R46 of the Q7 triode, a high-voltage control circuit current drive triode Q7, and a high-temperature part fan control relay K1.

[0037] The 11th pin and the 21st pin of the high-temperature part fan control relay K1 are electrically connected, the 12th pin and the 22nd pin of the high-temperature part fan control relay K1 are electrically connected, the 14th pin and the 24th pin of the high-temperature part fan control relay K1 are electrically connected, the A2 pin of the high-temperature part fan control relay K1 is electrically connected with the 2nd pin of the high-voltage control circuit current driving transistor Q7, the 3rd pin of the high-voltage control circuit current driving transistor Q7 is grounded, the 1st pin of the high-voltage control circuit current driving transistor Q7 and one end of the base resistor R46 of the Q7 transistor are electrically connected, the other end of the base resistor R46 of the Q7 transistor, one end of the transistor bias resistor R44 and the 3rd pin of the low-voltage control circuit current driving transistor Q10 are electrically connected, the other end of the transistor bias resistor R44 is grounded, and the 1st pin of the low-voltage control circuit current driving transistor Q10 and one end of the base resistor R39 of the Q10 transistor are electrically connected.

[0038] By adopting the technical scheme, the fan is opened to dissipate heat under the high-temperature state.

[0039] Further, the control fan closing unit comprises the base resistor R40 of the Q9 transistor, the low-voltage control circuit current driving transistor Q9, the transistor bias resistor R43, the base resistor R45 of the Q8 transistor, the high-voltage control circuit current driving transistor Q8 and the low-temperature part fan control relay K2.

[0040] The 11th pin and the 21st pin of the low-temperature part fan control relay K2 are electrically connected, the 12th pin and the 22nd pin of the low-temperature part fan control relay K2 are electrically connected, the 14th pin and the 24th pin of the low-temperature part fan control relay K2 are electrically connected, the A2 pin of the low-temperature part fan control relay K2 is electrically connected with the 2nd pin of the high-voltage control circuit current driving transistor Q8, the 3rd pin of the high-voltage control circuit current driving transistor Q8 is grounded, the 1st pin of the high-voltage control circuit current driving transistor Q8 and one end of the base resistor R45 of the Q8 transistor are electrically connected, the other end of the base resistor R45 of the Q8 transistor, the 3rd pin of the low-voltage control circuit current driving transistor Q9 and one end of the transistor bias resistor R43 are electrically connected, the other end of the transistor bias resistor R43 is grounded, and the 1st pin of the low-voltage control circuit current driving transistor Q9 and one end of the base resistor R40 of the Q9 transistor are electrically connected.

[0041] By adopting the technical scheme, the fan is closed under the low-temperature state.

[0042] In summary, the beneficial technical effects of the utility model are as follows:

[0043] 1. The high-temperature and low-temperature parts are detected respectively, the temperature control precision is improved, and the high-temperature part temperature is prevented from being too high or the low-temperature part temperature is prevented from being too low.

[0044] 2. Through the data acquisition, analysis and output control of the single-chip microcomputer, the circuit is simplified, and the failure rate of the circuit is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is the functional diagram of the utility model;

[0046] Figure 2 is the power processing module circuit diagram of the utility model;

[0047] Figure 3 is the high-temperature test numerical unit circuit diagram of the utility model;

[0048] Figure 4 is the low-temperature test numerical unit circuit diagram of the utility model;

[0049] Figure 5 is the single-chip microcomputer processing circuit diagram of the utility model;

[0050] Figure 6 is the high-temperature numerical display unit circuit diagram of the utility model;

[0051] Figure 7 is the low-temperature numerical display unit circuit diagram of the utility model;

[0052] Figure 8 is the control fan opening unit circuit diagram of the utility model;

[0053] Figure 9 is the control fan closing unit circuit diagram of the utility model. DETAILED DESCRIPTION

[0054] The utility model will be further explained in detail in combination with the drawings.

[0055] REFERENCE Figures 1-9 A novel high-low temperature automatic control circuit, power processing module, high-temperature test numerical unit, low-temperature test numerical unit, set high-temperature temperature value unit, set low-temperature temperature value unit, single-chip microcomputer processing unit, control fan opening unit, control fan closing unit, high-temperature numerical display unit and low-temperature numerical display unit, power processing module, high voltage 110V DC is converted into low-voltage DC power supply, and the single-chip microcomputer and other circuit work are used;

[0056] High-temperature test numerical unit, the temperature sensor signal of testing high temperature is processed into a standard electric signal, and the single-chip microcomputer is processed;

[0057] Low-temperature test numerical unit, the temperature sensor signal of testing low temperature is processed into a standard electric signal, and the single-chip microcomputer is processed;

[0058] High temperature temperature value setting unit, set high temperature detection comparison value in advance;

[0059] Low temperature temperature value setting unit, set low temperature detection comparison value in advance;

[0060] Single chip microcomputer processing unit, data acquisition, data analysis and control relay, nixie tube;

[0061] Control fan open unit, through the relay control fan open, heat dissipation cooling;

[0062] Control fan closing unit, through the relay control fan closing, stop heat dissipation cooling;

[0063] High temperature value display unit, high temperature sensor detection temperature display;

[0064] Low temperature value display unit, low temperature sensor detection temperature display.

[0065] As shown in Figures 1-9 The power supply processing module includes polarity protection diode D1, DC-DC voltage reduction module PS1, filter module C5 and three terminal voltage stabilizing tube U3, the 2 pin of DC-DC voltage reduction module PS1 is electrically connected with one end of polarity protection diode D1, the 3 pin of DC-DC voltage reduction module PS1 is grounded, the 4 pin of DC-DC voltage reduction module PS1, one end of filter module C5 and the 1 pin of three terminal voltage stabilizing tube U3 are electrically connected, the other end of filter module C5 is grounded, the 2 pin of three terminal voltage stabilizing tube U3 is grounded;

[0066] The high-temperature test numerical unit comprises a temperature sensor TR1, an input resistor R2, a pull-up bias resistor R5, an adjustable potentiometer RV2, a zero-adjusting voltage dividing resistor R8, a zero-adjusting voltage dividing resistor R9, a gain control resistor R11, a temperature sensor special processing integrated circuit U2, a power filter capacitor C4 and an output resistor R13. The 1st pin of the temperature sensor special processing integrated circuit U2 is electrically connected with the 2nd pin of the adjustable potentiometer RV2, the 2nd pin of the temperature sensor special processing integrated circuit U2 is electrically connected with one end of the gain control resistor R11, the 3rd pin of the temperature sensor special processing integrated circuit U2 is electrically connected with the other end of the gain control resistor R11, the 4th pin of the temperature sensor special processing integrated circuit U2 is electrically connected with one end of the pull-up bias resistor R5 and one end of the input resistor R2, the other end of the input resistor R2 is electrically connected with one end of the temperature sensor TR1, the other end of the temperature sensor TR1 is grounded, the 5th pin and the 6th pin of the temperature sensor special processing integrated circuit U2 are grounded, the 7th pin of the temperature sensor special processing integrated circuit U2 is electrically connected with one end of the output resistor R13, the 8th pin of the temperature sensor special processing integrated circuit U2 is electrically connected with one end of the power filter capacitor C4, the other end of the power filter capacitor C4 is grounded, the 3rd pin of the adjustable potentiometer RV2 is electrically connected with one end of the zero-adjusting voltage dividing resistor R8, and the 1st pin of the adjustable potentiometer RV2 is electrically connected with one end of the zero-adjusting voltage dividing resistor R9, and the other end of the zero-adjusting voltage dividing resistor R9 is grounded.

[0067] The low-temperature test numerical unit comprises a temperature sensor TR2, an input resistor R3, a pull-up bias resistor R4, an adjustable potentiometer RV1, a zero-adjusting voltage dividing resistor R6, a zero-adjusting voltage dividing resistor R7, a gain control resistor R10, a temperature sensor special processing integrated circuit U1 and an output resistor R12. The 1st pin of the temperature sensor special processing integrated circuit U1 is electrically connected with the 2nd pin of the adjustable potentiometer RV1, the 2nd pin of the temperature sensor special processing integrated circuit U1 is electrically connected with one end of the gain control resistor R10, the 3rd pin of the temperature sensor special processing integrated circuit U1 is electrically connected with the other end of the gain control resistor R10, the 4th pin of the temperature sensor special processing integrated circuit U1 is electrically connected with one end of the pull-up bias resistor R4 and one end of the input resistor R3, the other end of the input resistor R3 is electrically connected with one end of the temperature sensor TR2, the other end of the temperature sensor TR2 is grounded, the 5th pin and the 6th pin of the temperature sensor special processing integrated circuit U1 are grounded, the 7th pin of the temperature sensor special processing integrated circuit U1 is electrically connected with one end of the output resistor R12, the 3rd pin of the adjustable potentiometer RV1 is electrically connected with one end of the zero-adjusting voltage dividing resistor R6, the 1st pin of the adjustable potentiometer RV1 is electrically connected with one end of the zero-adjusting voltage dividing resistor R7, and the other end of the zero-adjusting voltage dividing resistor R7 is grounded.

[0068] As Figures 1-9As shown, the single-chip microcomputer processing unit includes: a crystal oscillator Y1, a crystal oscillator compensation capacitor C8, a crystal oscillator compensation capacitor C9, a single-chip microcomputer circuit IC1, an adjustable potentiometer RV4, and an adjustable potentiometer RV3. The 6-pin of the single-chip microcomputer circuit IC1, one end of the crystal oscillator Y1, and one end of the crystal oscillator compensation capacitor C8 are electrically connected. The other end of the crystal oscillator compensation capacitor C8 is grounded. The 7-pin of the single-chip microcomputer circuit IC1, the other end of the crystal oscillator Y1, and one end of the crystal oscillator compensation capacitor C9 are electrically connected. The other end of the crystal oscillator compensation capacitor C9 is grounded. The 14-pin of the single-chip microcomputer circuit IC1 is grounded. The 18-pin of the single-chip microcomputer circuit IC1 and the 2-pin of the adjustable potentiometer RV3 are electrically connected. The 3-pin of the adjustable potentiometer RV3 is grounded. The 19-pin of the single-chip microcomputer circuit IC1 and the 2-pin of the adjustable potentiometer RV4 are electrically connected. The 3-pin of the adjustable potentiometer RV4 is grounded.

[0069] The high-temperature numerical display unit includes: a digital tube input resistor R24, a digital tube input resistor R25, a digital tube input resistor R26, a digital tube input resistor R27, a digital tube input resistor R28, a digital tube input resistor R29, a digital tube input resistor R30, a digital tube input resistor R31, a digital tube U5, a power drive transistor Q2, a power drive transistor Q4, a power drive transistor Q6, a base resistor R33, a base resistor R35, and a base resistor R37. The 11-pin of the digital tube U5 and one end of the digital tube input resistor R24 are electrically connected. The 7-pin of the digital tube U5 and one end of the digital tube input resistor R25 are electrically connected. The 4-pin of the digital tube U5 and one end of the digital tube input resistor R26 are electrically connected. The 2-pin of the digital tube U5 and one end of the digital tube input resistor R27 are electrically connected. The 1-pin of the digital tube U5 and one end of the digital tube input resistor R28 are electrically connected. The 10-pin of the digital tube U5 and one end of the digital tube input resistor R29 are electrically connected. The 5-pin of the digital tube U5 and one end of the digital tube input resistor R30 are electrically connected. The 3-pin of the digital tube U5 and one end of the digital tube input resistor R31 are electrically connected. The 12-pin of the digital tube U5 and the 3-pin of the power drive transistor Q2 are electrically connected. The 1-pin of the power drive transistor Q2 and one end of the base resistor R33 are electrically connected. The 9-pin of the digital tube U5 and the 3-pin of the power drive transistor Q4 are electrically connected. The 1-pin of the power drive transistor Q4 and one end of the base resistor R35 are electrically connected. The 8-pin of the digital tube U5 and the 3-pin of the power drive transistor Q6 are electrically connected. The 1-pin of the power drive transistor Q6 and one end of the base resistor R37 are electrically connected. The other end of the base resistor R33 is electrically connected to the 22-pin of the single-chip microcomputer circuit IC1. The other end of the base resistor R35 is electrically connected to the 23-pin of the single-chip microcomputer circuit IC1. The other end of the base resistor R37 is electrically connected to the 24-pin of the single-chip microcomputer circuit IC1.

[0070] The low temperature numerical display unit includes the digital tube input resistance R15, the digital tube input resistance R16, the digital tube input resistance R17, the digital tube input resistance R18, the digital tube input resistance R19, the digital tube input resistance R20, the digital tube input resistance R21, the digital tube input resistance R22, the digital tube U6, the power drive triode Q1, the power drive triode Q3, the power drive triode Q5, the base level resistance R32, the base level resistance R34 and the base level resistance R36, the 11 pin of the digital tube U6 is electrically connected with one end of the digital tube input resistance R15, the 7 pin of the digital tube U6 and one end of the digital tube input resistance R16 are electrically connected, the 4 pin of the digital tube U6 and one end of the digital tube input resistance R17 are electrically connected, the 2 pin of the digital tube U6 and one end of the digital tube input resistance R18 are electrically connected, the 1 pin of the digital tube U6 and one end of the digital tube input resistance R19 are electrically connected, the 10 pin of the digital tube U6 and one end of the digital tube input resistance R20 are electrically connected, the 5 pin of the digital tube U6 and one end of the digital tube input resistance R21 are electrically connected, the 3 pin of the digital tube U6 and one end of the digital tube input resistance R22 are electrically connected, the 12 pin of the digital tube U6 and the 3 pin of the power drive triode Q1 are electrically connected, the 1 pin of the power drive triode Q1 and one end of the base level resistance R32 are electrically connected, the 9 pin of the digital tube U6 and the 3 pin of the power drive triode Q3 are electrically connected, the 1 pin of the power drive triode Q3 and one end of the base level resistance R34 are electrically connected, the 8 pin of the digital tube U6 and the 3 pin of the power drive triode Q5 are electrically connected, the 1 pin of the power drive triode Q5 and one end of the base level resistance R36 are electrically connected, the other end of the base level resistance R32 is electrically connected with the 25 pin of the single-chip microcomputer circuit IC1, the other end of the base level resistance R34 is electrically connected with the 9 pin of the single-chip microcomputer circuit IC1, the other end of the base level resistance R36 is electrically connected with the 10 pin of the single-chip microcomputer circuit IC1;

[0071] The control fan opening unit comprises: a low-voltage control circuit current driving transistor Q10, a base resistor R39 of the Q10 transistor, a transistor bias resistor R44, a base resistor R46 of the Q7 transistor, a high-voltage control circuit current driving transistor Q7, and a high-temperature part fan control relay K1. The 11th and 21st pins of the high-temperature part fan control relay K1 are electrically connected. The 12th and 22nd pins of the high-temperature part fan control relay K1 are electrically connected. The 14th and 24th pins of the high-temperature part fan control relay K1 are electrically connected. The A2 pin of the high-temperature part fan control relay K1 is electrically connected with the 2nd pin of the high-voltage control circuit current driving transistor Q7. The 3rd pin of the high-voltage control circuit current driving transistor Q7 is grounded. The 1st pin of the high-voltage control circuit current driving transistor Q7 is electrically connected with one end of the base resistor R46 of the Q7 transistor. The other end of the base resistor R46 of the Q7 transistor, one end of the transistor bias resistor R44, and the 3rd pin of the low-voltage control circuit current driving transistor Q10 are electrically connected. The other end of the transistor bias resistor R44 is grounded. The 1st pin of the low-voltage control circuit current driving transistor Q10 is electrically connected with one end of the base resistor R39 of the Q10 transistor.

[0072] The control fan closing unit comprises: a base resistor R40 of the Q9 transistor, a low-voltage control circuit current driving transistor Q9, a transistor bias resistor R43, a base resistor R45 of the Q8 transistor, a high-voltage control circuit current driving transistor Q8, and a low-temperature part fan control relay K2. The 11th and 21st pins of the low-temperature part fan control relay K2 are electrically connected. The 12th and 22nd pins of the low-temperature part fan control relay K2 are electrically connected. The 14th and 24th pins of the low-temperature part fan control relay K2 are electrically connected. The A2 pin of the low-temperature part fan control relay K2 is electrically connected with the 2nd pin of the high-voltage control circuit current driving transistor Q8. The 3rd pin of the high-voltage control circuit current driving transistor Q8 is grounded. The 1st pin of the high-voltage control circuit current driving transistor Q8 is electrically connected with one end of the base resistor R45 of the Q8 transistor. The other end of the base resistor R45 of the Q8 transistor, the 3rd pin of the low-voltage control circuit current driving transistor Q9, and one end of the transistor bias resistor R43 are electrically connected. The other end of the transistor bias resistor R43 is grounded. The 1st pin of the low-voltage control circuit current driving transistor Q9 is electrically connected with one end of the base resistor R40 of the Q9 transistor.

[0073] The implementation principle of the embodiment is: a power processing module converts high-voltage 110V DC into low-voltage DC power for use by a single-chip microcomputer and other circuits; a high-temperature test value unit processes a temperature sensor signal of a tested high temperature into a standard electrical signal for processing by the single-chip microcomputer; a low-temperature test value unit processes a temperature sensor signal of a tested low temperature into a standard electrical signal for processing by the single-chip microcomputer; a set high-temperature value unit sets a high-temperature detection comparison value in advance; a set low-temperature value unit sets a low-temperature detection comparison value in advance; a single-chip microcomputer processing unit collects data, analyzes data, and controls a relay and a digital tube; a control fan opening unit opens a fan through the relay to dissipate heat and reduce temperature; a control fan closing unit closes the fan through the relay to stop dissipating heat and reducing temperature; a high-temperature value display unit displays a temperature detected by a high-temperature sensor; and a low-temperature value display unit displays a temperature detected by a low-temperature sensor. The single-chip microcomputer embedded programming is introduced, the logic circuit is simplified, the single-chip microcomputer is used to analyze and process the temperature sensor input signal, the on-off of the relay is controlled, the high-temperature heating and the low-temperature heat dissipation are realized, the digital tube is controlled by the single-chip microcomputer to display the real-time test temperature, the single-chip microcomputer is used to collect, analyze, and control, the circuit is simplified, and the failure rate is reduced.

[0074] The embodiments of the specific implementation are the preferred embodiments of the utility model, and do not limit the protection scope of the utility model, so that: equivalent changes made according to the structure, shape, principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A novel high and low temperature automatic control circuit, comprising a power processing module, a high temperature test value unit, a low temperature test value unit, a high temperature setting unit, a low temperature setting unit, a microcontroller processing unit, a fan control unit, a fan control unit, a fan control unit, a high temperature value display unit, and a low temperature value display unit, characterized in that: The power processing module converts high voltage 110V DC into low voltage DC power for single-chip microcomputer and other circuit working; The high temperature test value unit processes the temperature sensor signal of the test high temperature into standard electric signal for single-chip microcomputer processing; The low temperature test value unit processes the temperature sensor signal of the test low temperature into standard electric signal for single-chip microcomputer processing; The set high temperature value unit sets the high temperature detection comparison value in advance; The set low temperature value unit sets the low temperature detection comparison value in advance; The single-chip microcomputer processing unit collects data, analyzes data and controls relay and nixie tube; The control fan opening unit opens the fan through the relay to dissipate heat; The control fan closing unit closes the fan through the relay to stop heat dissipation; The high temperature value display unit displays the temperature detected by the high temperature sensor; The low temperature value display unit displays the temperature detected by the low temperature sensor.

2. The novel high-low temperature automatic control circuit according to claim 1, characterized in that: The power processing module comprises polarity protection diode D1, DC-DC voltage reduction module PS1, filter module C5 and three-terminal voltage stabilizing tube U3; The 2-pin of the DC-DC voltage reduction module PS1 is electrically connected with one end of the polarity protection diode D1, the 3-pin of the DC-DC voltage reduction module PS1 is grounded, the 4-pin of the DC-DC voltage reduction module PS1, one end of the filter module C5 and the 1-pin of the three-terminal voltage stabilizing tube U3 are electrically connected, the other end of the filter module C5 is grounded, and the 2-pin of the three-terminal voltage stabilizing tube U3 is grounded.

3. The novel high-low temperature automatic control circuit according to claim 1, characterized in that: The high temperature test value unit comprises temperature sensor TR1, input resistance R2, pull-up bias resistance R5, adjustable potentiometer RV2, zero-adjusting voltage dividing resistance R8, zero-adjusting voltage dividing resistance R9, gain control resistance R11, temperature sensor dedicated processing integrated circuit U2, power filter capacitor C4 and output resistance R13; The 1-pin of the temperature sensor dedicated processing integrated circuit U2 and the 2-pin of the adjustable potentiometer RV2 are electrically connected, the 2-pin of the temperature sensor dedicated processing integrated circuit U2 and one end of the gain control resistance R11 are electrically connected, the 3-pin of the temperature sensor dedicated processing integrated circuit U2 and the other end of the gain control resistance R11 are electrically connected, the 4-pin of the temperature sensor dedicated processing integrated circuit U2, one end of the pull-up bias resistance R5 and one end of the input resistance R2 are electrically connected, the other end of the input resistance R2 and one end of the temperature sensor TR1 are electrically connected, the other end of the temperature sensor TR1 is grounded, the 5-pin and 6-pin of the temperature sensor dedicated processing integrated circuit U2 are grounded, the 7-pin of the temperature sensor dedicated processing integrated circuit U2 and one end of the output resistance R13 are electrically connected, the 8-pin of the temperature sensor dedicated processing integrated circuit U2 and one end of the power filter capacitor C4 are electrically connected, the other end of the power filter capacitor C4 is grounded, the 3-pin of the adjustable potentiometer RV2 and one end of the zero-adjusting voltage dividing resistance R8 are electrically connected, the 1-pin of the adjustable potentiometer RV2 and one end of the zero-adjusting voltage dividing resistance R9 are electrically connected, and the other end of the zero-adjusting voltage dividing resistance R9 is grounded.

4. The novel high-low temperature automatic control circuit according to claim 1, characterized in that: The low temperature test numerical unit includes temperature sensor TR2, input resistance R3, pull-up bias resistance R4, adjustable potentiometer RV1, zero setting voltage dividing resistance R6, zero setting voltage dividing resistance R7, gain control resistance R10, temperature sensor special processing integrated circuit U1 and output resistance R12; The 1st pin of the temperature sensor special processing integrated circuit U1 is electrically connected with the 2nd pin of the adjustable potentiometer RV1, the 2nd pin of the temperature sensor special processing integrated circuit U1 is electrically connected with one end of the gain control resistance R10, the 3rd pin of the temperature sensor special processing integrated circuit U1 is electrically connected with the other end of the gain control resistance R10, the 4th pin of the temperature sensor special processing integrated circuit U1, one end of the pull-up bias resistance R4 and one end of the input resistance R3 are electrically connected, the other end of the input resistance R3 is electrically connected with one end of the temperature sensor TR2, the other end of the temperature sensor TR2 is grounded, the 5th pin and the 6th pin of the temperature sensor special processing integrated circuit U1 are grounded, the 7th pin of the temperature sensor special processing integrated circuit U1 is electrically connected with one end of the output resistance R12, the 3rd pin of the adjustable potentiometer RV1 is electrically connected with one end of the zero setting voltage dividing resistance R6, the 1st pin of the adjustable potentiometer RV1 is electrically connected with one end of the zero setting voltage dividing resistance R7, the other end of the zero setting voltage dividing resistance R7 is grounded.

5. The novel high-low temperature automatic control circuit according to claim 1, characterized in that: The single-chip microcomputer processing unit includes crystal oscillator Y1, crystal oscillator compensation capacitor C8, crystal oscillator compensation capacitor C9, single-chip microcomputer circuit IC1, adjustable potentiometer RV4 and adjustable potentiometer RV3; The 6th pin of the single-chip microcomputer circuit IC1, one end of the crystal oscillator Y1 and one end of the crystal oscillator compensation capacitor C8 are electrically connected, the other end of the crystal oscillator compensation capacitor C8 is grounded, the 7th pin of the single-chip microcomputer circuit IC1, the other end of the crystal oscillator Y1 and one end of the crystal oscillator compensation capacitor C9 are electrically connected, the other end of the crystal oscillator compensation capacitor C9 is grounded, the 14th pin of the single-chip microcomputer circuit IC1 is grounded, the 18th pin of the single-chip microcomputer circuit IC1 is electrically connected with the 2nd pin of the adjustable potentiometer RV3, the 3rd pin of the adjustable potentiometer RV3 is grounded, the 19th pin of the single-chip microcomputer circuit IC1 is electrically connected with the 2nd pin of the adjustable potentiometer RV4, the 3rd pin of the adjustable potentiometer RV4 is grounded.

6. The novel high-low temperature automatic control circuit according to claim 5, characterized in that: The high temperature numerical display unit includes digital tube input resistance R24, digital tube input resistance R25, digital tube input resistance R26, digital tube input resistance R27, digital tube input resistance R28, digital tube input resistance R29, digital tube input resistance R30, digital tube input resistance R31, digital tube U5, power drive triode Q2, power drive triode Q4, power drive triode Q6, base stage resistance R33, base stage resistance R35 and base stage resistance R37; The 11 feet of the nixie tube U5 and one end of the nixie tube input resistance R24 are electrically connected, the 7 feet of the nixie tube U5 and one end of the nixie tube input resistance R25 are electrically connected, the 4 feet of the nixie tube U5 and one end of the nixie tube input resistance R26 are electrically connected, the 2 feet of the nixie tube U5 and one end of the nixie tube input resistance R27 are electrically connected, the 1 feet of the nixie tube U5 and one end of the nixie tube input resistance R28 are electrically connected, the 10 feet of the nixie tube U5 and one end of the nixie tube input resistance R29 are electrically connected, the 5 feet of the nixie tube U5 and one end of the nixie tube input resistance R30 are electrically connected, the 3 feet of the nixie tube U5 and one end of the nixie tube input resistance R31 are electrically connected, the 12 feet of the nixie tube U5 and the 3 feet of the power drive transistor Q2 are electrically connected, the 1 feet of the power drive transistor Q2 and one end of the base resistance R33 are electrically connected, the 9 feet of the nixie tube U5 and the 3 feet of the power drive transistor Q4 are electrically connected, the 1 feet of the power drive transistor Q4 and one end of the base resistance R35 are electrically connected, the 8 feet of the nixie tube U5 and the 3 feet of the power drive transistor Q6 are electrically connected, the 1 feet of the power drive transistor Q6 and one end of the base resistance R37 are electrically connected, the other end of the base resistance R33 is electrically connected with the 22 feet of the single-chip microcomputer circuit IC1, the other end of the base resistance R35 is electrically connected with the 23 feet of the single-chip microcomputer circuit IC1, the other end of the base resistance R37 is electrically connected with the 24 feet of the single-chip microcomputer circuit IC1.

7. The novel high-low temperature automatic control circuit according to claim 5, characterized in that: The low-temperature numerical value display unit includes nixie tube input resistance R15, nixie tube input resistance R16, nixie tube input resistance R17, nixie tube input resistance R18, nixie tube input resistance R19, nixie tube input resistance R20, nixie tube input resistance R21, nixie tube input resistance R22, nixie tube U6, power drive transistor Q1, power drive transistor Q3, power drive transistor Q5, base resistance R32, base resistance R34 and base resistance R36; The 11 feet of the numeral tube U6 are electrically connected with one end of the numeral tube input resistance R15, the 7 feet of the numeral tube U6 are electrically connected with one end of the numeral tube input resistance R16, the 4 feet of the numeral tube U6 are electrically connected with one end of the numeral tube input resistance R17, the 2 feet of the numeral tube U6 are electrically connected with one end of the numeral tube input resistance R18, the 1 feet of the numeral tube U6 are electrically connected with one end of the numeral tube input resistance R19, the 10 feet of the numeral tube U6 are electrically connected with one end of the numeral tube input resistance R20, the 5 feet of the numeral tube U6 are electrically connected with one end of the numeral tube input resistance R21, the 3 feet of the numeral tube U6 are electrically connected with one end of the numeral tube input resistance R22, the 12 feet of the numeral tube U6 are electrically connected with the 3 feet of the power drive triode Q1, the 1 feet of the power drive triode Q1 are electrically connected with one end of the base level resistance R32, the 9 feet of the numeral tube U6 are electrically connected with the 3 feet of the power drive triode Q3, the 1 feet of the power drive triode Q3 are electrically connected with one end of the base level resistance R34, the 8 feet of the numeral tube U6 are electrically connected with the 3 feet of the power drive triode Q5, the 1 feet of the power drive triode Q5 are electrically connected with one end of the base level resistance R36, the other end of the base level resistance R32 is electrically connected with the 25 feet of the single-chip computer circuit IC1, the other end of the base level resistance R34 is electrically connected with the 9 feet of the single-chip computer circuit IC1, and the other end of the base level resistance R36 is electrically connected with the 10 feet of the single-chip computer circuit IC1.

8. The novel high-low temperature automatic control circuit according to claim 1, characterized in that: The control fan opening unit comprises the low-voltage control circuit current drive triode Q10, the base level resistance R39 of the triode Q10, the triode bias resistance R44, the base level resistance R46 of the triode Q7, the high-voltage control circuit current drive triode Q7 and the high-temperature part fan control relay K1. The 11 feet and the 21 feet of the high-temperature part fan control relay K1 are electrically connected, the 12 feet and the 22 feet of the high-temperature part fan control relay K1 are electrically connected, the 14 feet and the 24 feet of the high-temperature part fan control relay K1 are electrically connected, the A2 feet of the high-temperature part fan control relay K1 are electrically connected with the 2 feet of the high-voltage control circuit current drive triode Q7, the 3 feet of the high-voltage control circuit current drive triode Q7 are grounded, the 1 feet of the high-voltage control circuit current drive triode Q7 are electrically connected with one end of the base level resistance R46 of the triode Q7, the other end of the base level resistance R46 of the triode Q7, one end of the triode bias resistance R44 and the 3 feet of the low-voltage control circuit current drive triode Q10 are electrically connected, the other end of the triode bias resistance R44 is grounded, and the 1 feet of the low-voltage control circuit current drive triode Q10 are electrically connected with one end of the base level resistance R39 of the triode Q10.

9. The novel high-low temperature automatic control circuit according to claim 1, characterized in that: The control fan closing unit comprises the base level resistance R40 of the triode Q9, the low-voltage control circuit current drive triode Q9, the triode bias resistance R43, the base level resistance R45 of the triode Q8, the high-voltage control circuit current drive triode Q8 and the low-temperature part fan control relay K2. The 11th pin and the 21st pin of the low-temperature part fan control relay K2 are electrically connected, the 12th pin and the 22nd pin of the low-temperature part fan control relay K2 are electrically connected, the 14th pin and the 24th pin of the low-temperature part fan control relay K2 are electrically connected, the A2 pin of the low-temperature part fan control relay K2 is electrically connected with the 2nd pin of the high-voltage control circuit current driving triode Q8, the 3rd pin of the high-voltage control circuit current driving triode Q8 is grounded, the 1st pin of the high-voltage control circuit current driving triode Q8 is electrically connected with one end of the base stage resistance R45 of the Q8 triode, the other end of the base stage resistance R45 of the Q8 triode, the 3rd pin of the low-voltage control circuit current driving triode Q9 and one end of the triode bias resistance R43 are electrically connected, the other end of the triode bias resistance R43 is grounded, the 1st pin of the low-voltage control circuit current driving triode Q9 is electrically connected with one end of the base stage resistance R40 of the Q9 triode.

Images