CN207937074U - A kind of Intellectual Thermal Transmitter - Google Patents

Abstract

The utility model discloses an intelligent temperature transmitter, which comprises an STM32F051C8T6 basic system, a three-wire PT100 amplifying circuit, two sets of relay control circuits, a power supply interface, a 24V to 5V circuit, a 5V to 3.3V circuit, a 3.3V reference circuit, and a download interface , Dot matrix LCD screen LED and button group. The utility model greatly reduces the workload of daily maintenance and calibration, is simple to operate, can conveniently adjust the sensitivity of the sensor, increases the reliability of the transmitter, and achieves the purposes of facilitating processing, ensuring precision and reducing processing costs.

Description

An Intelligent Temperature Transmitter

technical field

The utility model belongs to the field of transmitters, in particular to temperature transmitters.

Background technique

A device that converts physical measurement signals or ordinary electrical signals into standard electrical signal output or can be output in a communication protocol. A temperature transmitter is an instrument that converts temperature variables into a transmittable standardized output signal, and is mainly used for the measurement and control of temperature parameters in industrial processes. The current transmitter is to convert the AC current of the main circuit under test into a constant current loop standard signal, which is continuously sent to the receiving device.

The temperature and current transmitter converts the signal of the temperature sensor into a current signal and connects it to the secondary instrument to display the corresponding temperature. The function of the temperature and current transmitter is to convert the resistance signal into a current signal, input it into the instrument, and display the temperature.

Most of the integrated temperature transmitters on the market today are of a single type, that is, only one type of sensor can be connected, thermal resistance or thermocouple, and the transmitter or corresponding display instrument must be replaced if the sensor is connected, so it is A serious waste of resources.

Utility model content

The utility model provides an intelligent temperature transmitter, which greatly reduces the workload of daily maintenance and calibration, is simple to operate, can conveniently adjust the sensitivity of the sensor, and increases the reliability of the transmitter.

In order to achieve the above object, the utility model adopts the following technical solutions:

An intelligent temperature transmitter, including STM32F051C8T6 basic system (1), three-wire PT100 amplifier circuit (2), two sets of relay control circuits (3), power interface (4), 24V to 5V circuit (5), 5V to 3.3V circuit (6), 3.3V reference circuit (7), download interface (8), dot matrix LCD screen LED and button group, the three-wire PT100 amplifier circuit (2), relay control circuit (3), 3.3V The reference circuit (7), dot-matrix LCD screen LEDs and button groups are respectively connected to the corresponding pins of the STM32F051C8T6 basic system (1), the power interface (4) provides 24V voltage for the relay RE24DC of the relay control circuit (3), and the power interface (4 ) through the 24V to 5V circuit (5) to provide 5V voltage for the load of the relay control circuit (3) and the three-wire PT100 amplifier circuit (2), and the power interface (4) through the 24V to 5V circuit (5) and the 5V to 3.3V circuit (6) Provide 3.3V voltage for STM32F051C8T6 basic system (1), 3.3V reference circuit (7) provide 3.3V DC voltage for STM32F051C8T6 basic system (1), three-wire PT100 amplifier circuit (2) amplifies the collected temperature signal After that, it is sent to the STM32F051C8T6 basic system (1), the relay control circuit (3) controls the on-off of the power interface (4), and the download interface (8) provides the download function for the data processed by the STM32F051C8T6 basic system (1). The retrieved data is displayed on the dot-matrix LCD screen LED.

Further, the STM32F051C8T6 basic system (1) is composed of STM32F051C8T6 single-chip microcomputer U2, and pin 1 of STM32F051C8T6 single-chip microcomputer U2 is connected with one end of the first capacitor C1 and 3.3V voltage, the other end of the first capacitor C1 is grounded, and 5 pins of the STM32F051C8T6 single-chip microcomputer U2 The pin is connected to one end of the second crystal oscillator Y2 and one end of the fifth capacitor C5, the other end of the fifth capacitor C5 is connected to one end of the sixth capacitor C6 and grounded, and the other end of the sixth capacitor C6 is connected to the other end of the second crystal oscillator Y2 Connect with pin 6 of STM32F051C8T6 single-chip microcomputer U2, pin 7 of STM32F051C8T6 single-chip microcomputer U2 is connected with one end of the second resistor R2 and one end of the fourth capacitor C4, the other end of the second resistor R2 is connected to 3.3V voltage, and the other end of the fourth capacitor C4 Ground, the 9 pins of STM32F051C8T6 MCU U2 are connected to the 3.3V reference circuit (7), the 11 pins of STM32F051C8T6 MCU U2 are connected to the three-wire PT100 amplifier circuit (2), the 18-22, 25, 39-43, 45 of STM32F051C8T6 MCU U2 , 46 pins are respectively connected to the corresponding pins of the dot matrix LCD screen LED, the 23rd pin of the STM32F051C8T6 single-chip microcomputer U2 is connected to one end of the twelfth capacitor C12 and grounded, and the other end of the twelfth capacitor C12 is connected to the 24th pin of the STM32F051C8T6 single-chip microcomputer U2 and grounded. Connect the 3.3V voltage, the 26-31 pins of STM32F051C8T6 single-chip microcomputer U2 are respectively connected with the corresponding pins of the button group, the 32 and 33 pins of STM32F051C8T6 single-chip microcomputer U2 are respectively connected with two sets of relay control circuits (3), the 34 and 37 pins of STM32F051C8T6 single-chip microcomputer U2 are respectively It is connected to the corresponding pin of the download interface (8), the first resistor R1 is connected in series between pin 44 of STM32F051C8T6 microcontroller U2 and the ground, and pin 47 of STM32F051C8T6 microcontroller U2 is connected in parallel with one end of the thirteenth capacitor C13, and the thirteenth capacitor C13 The other end is connected to pin 48 of STM32F051C8T6 microcontroller U2 and connected to 3.3V voltage.

Further, the three-wire PT100 amplifying circuit (2) is composed of first to fourth operational amplifiers U1-U4 and platinum thermal resistance S1, the non-inverting input terminal of the first operational amplifier U1 is connected to one end of the twentieth resistor R20 and the first One end of the twenty-fourth resistor R24 is connected, the other end of the twentieth resistor R20 is connected to one end of the nineteenth resistor R19 and pins 1 and 3 of the voltage regulator T1, and the other end of the nineteenth resistor R19 is connected to +5V voltage, Pin 2 of the voltage regulator T1 is grounded, the other end of the twenty-fourth resistor R24 and one end of the twenty-eighth resistor R28, the anode of the third diode E3, one end of the thirtieth resistor R30 and the thirty-first resistor One end of R31 is connected, the other end of the twenty-eighth resistor R28 is connected to the output end of the first op-amp U1 and one end of the twenty-fifth resistor R25, the other end of the twenty-fifth resistor R25 is connected to the opposite end of the first op-amp U1 The phase input end is connected to one end of the twenty-first resistor R21, the other end of the twenty-first resistor R21 is grounded, the cathode of the third diode E3 is connected to pin 1 of the platinum thermal resistance S1, and the other end of the thirty-first resistor R30 is connected to the ground. One end is connected to pins 2 and 3 of the platinum thermal resistance S1 and grounded, the other end of the thirty-first resistor R31 is connected to one end of the eighth capacitor C8, one end of the thirty-third resistor R33, one end of the thirty-fourth resistor R34 and The inverting input terminal of the third operational amplifier U3 is connected, the other end of the eighth capacitor C8, the other end of the thirty-third resistor R33, the other end of the thirty-fourth resistor R34 and the output terminal of the third operational amplifier U3 are connected, The non-inverting input end of the second operational amplifier U2 is connected to one end of the twenty-second resistor R22 and one end of the twenty-sixth resistor R26, and the other end of the twenty-second resistor R22 is connected to pins 1 and 3 of the voltage stabilizing source T1, The other end of the twenty-sixth resistor R26 is connected to one end of the twenty-ninth resistor R29, pin 1 of the platinum thermal resistor S1 and one end of the thirty-second resistor R32, and the other end of the twenty-ninth resistor R29 is connected to the second terminal. put the output end of U2 and one end of the twenty-seventh resistor R27, the other end of the twenty-seventh resistor R27 is connected with the inverting input end of the second operational amplifier U2 and one end of the twenty-third resistor R23, the twenty-third The other end of the resistor R23 is grounded, the other end of the thirty-second resistor R32 is connected to one end of the thirty-fifth resistor R35, one end of the thirty-sixth resistor R36 and the non-inverting input end of the third operational amplifier U3, the thirty-fifth The other end of the resistor R35 is connected to the other end of the thirty-sixth resistor R36 and grounded, the output terminal of the third operational amplifier U3 is also connected to the non-inverting input terminal of the fourth operational amplifier U4, and the inverting input terminal of the fourth operational amplifier U4 It is connected with the output end of the fourth operational amplifier U4 and one end of the thirty-seventh resistor R37, the pin 4 of the fourth operational amplifier U4 is connected with one end of the ninth capacitor C9 and connected to +5V voltage, and the other end of the ninth capacitor C9 is grounded A tenth capacitor C10 is connected in series between the other end of the thirty-seventh resistor R37 and the ground.

Further, the other end of the thirty-seventh resistor R37 of the three-wire PT100 amplifying circuit (2) is also connected to the LC filter circuit (21), and the LC filter circuit (21) is composed of the thirty-eighth resistor R38 and the eleventh capacitor Composed of C11, one end of the thirty-eighth resistor R38 is connected to the other end of the thirty-seventh resistor R37, the other end of the thirty-eighth resistor R38 is connected to one end of the eleventh capacitor C11 and pin 11 of the STM32F051C8T6 single-chip microcomputer U2, the first The other end of the eleventh capacitor C11 is grounded.

Further, the two groups of relay control circuits (3) are all composed of relay RE24DC, the 2 pins of relay RE24DC are connected with the positive pole of the fifth diode D5 and connected to +24V voltage, the negative pole of the fifth diode D5 is connected with the positive pole of relay RE24DC Pin 1 of the fifth transistor Q5 is connected to the collector, the base of the fifth transistor Q5 is connected to one end of the twenty-sixth resistor R26, and the other end of the twenty-sixth resistor R26 is connected to the fourth transistor The collector of Q4 is connected to one end of the twenty-eighth resistor R28, the other end of the twenty-eighth resistor R28 is connected to the collector of the fifth triode Q5 and grounded, and the base of the fourth triode Q4 is connected to the second One end of the seventeenth resistor R27 is connected to one end of the twenty-ninth resistor R29, the other end of the twenty-seventh resistor R27 is connected to the emitter of the fourth triode Q4 and connected to +5V voltage, the twenty-ninth resistor R29 The other end is connected to pin 32/33 of STM32F051C8T6 MCU U2.

Further, the power interface (4) is composed of a first capacitor C1, a second capacitor C2, a first diode D1 and a first connector J1, one end of the first capacitor C1 is connected to one end of the second capacitor C2 and Connect to the power supply, the other end of the first capacitor C1 is connected to the positive pole of the first diode D1 and connected to +24V voltage, the negative pole of the first diode D1 is connected to the pin 3 of the first connector J1, and the other end of the second capacitor C2 One end is grounded with pin 1 of the first connector J1, and pin 2 of the first connector J1 outputs current.

Further, the 24V to 5V circuit (5) is composed of a fifth step-down switch-type integrated voltage regulator circuit U5, pin 1 of the fifth step-down switch-type integrated voltage regulator circuit U5 is connected to +24V voltage, and the fifth step-down switch The 3rd and 5th pins of the type integrated voltage stabilizing circuit U5 are grounded, the third capacitor C3 and the first capacitor E1 are connected in parallel between the 1st pin and the 3rd, 5th pins of the fifth step-down switch type integrated voltage stabilizing circuit U5, and the fifth step-down switch Pin 2 of the type integrated voltage stabilizing circuit U5 is connected to the anode of the second diode D2 and one end of the first inductor L1, and the cathode of the second diode D2 is connected to the cathode of the second capacitor E2 and one end of the fourth capacitor C4 and grounded, the other end of the first inductance L1 is connected to pin 4 of the fifth step-down switching integrated voltage regulator circuit U5, the positive pole of the second capacitor E2 and the other end of the fourth capacitor C4 to output +5V voltage;

Further, the 5V to 3.3V circuit (6) is composed of a first step-down switch-type integrated voltage regulator circuit U1, pin 3 of the first step-down switch-type integrated voltage regulator circuit U1 and one end of the seventeenth capacitor C17 and The positive pole of the fourth capacitor E4 is connected and connected to +5V voltage, the other end of the seventeenth capacitor C17 is connected to the negative pole of the fourth capacitor E4 and grounded, and pin 1 of the first step-down switching integrated voltage regulator circuit U1 is grounded, and the first Pin 2 of the step-down switching integrated voltage stabilizing circuit U1 is connected to pin 4 of the first step-down switching integrated voltage stabilizing circuit U1, the positive pole of the first capacitor E1 and one end of the eighth capacitor C8 to output a voltage of 3.3V. The negative pole of the capacitor E1 is connected to the other end of the eighth capacitor C8 and grounded;

Further, the 3.3V reference circuit (7) is composed of a first inductor L1, one end of the first inductor L1, one end of the fourteenth capacitor C14, one end of the seventh capacitor C7, the positive pole of the second capacitor E2 and the ninth One end of the resistor R9 is connected, the other end of the ninth resistor R9 is connected to +3.3V voltage, the other end of the fourteenth capacitor C14 is connected to the negative pole of the third capacitor E3, the other end of the fifteenth capacitor C15, and the other end of the seventh capacitor C7 One end, the negative pole of the second capacitor E2 is connected to one end of the tenth resistor R10, the other end of the tenth resistor R10 is grounded, the other end of the first inductor L1 is connected to the positive pole of the third capacitor E3, and one end of the fifteenth capacitor C15 is connected and Connect to pin 9 of STM32F051C8T6 microcontroller U2.

Further, the download interface (8) is composed of the eighth connector J8, pin 1 of the eighth connector J8 is connected to one end of the third resistor R3 and grounded, and pin 2 of the eighth connector J8 is connected to the third resistor R3 The other end of the STM32F051C8T6 single-chip microcomputer U2 is connected to the 37-pin, the 3rd pin of the eighth connector J8 is connected to the 34-pin of the STM32F051C8T6 single-chip microcomputer U2 and one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the eighth connector J8 4 pins are connected and connected to +3.3V voltage.

Further, the 12-24 pins of the dot-matrix LCD screen LED are respectively connected to the corresponding pins of the STM32F051C8T6 single-chip microcomputer U2, the 1, 7, and 11 pins of the dot-matrix LCD screen LED are grounded, and the 6 and 10 pins of the dot-matrix LCD screen LED are connected to the ground. +3.3V voltage, there is a sixteenth capacitor C16 between pins 4 and 5, pins 2 and 3, and pin 1 and the ground of the dot-matrix LCD screen LED.

Further, the button group is composed of the first to sixth buttons K1-K6, one end of the first to sixth buttons K1-K6 is connected and grounded, and the other ends of the first to sixth buttons K1-K6 are connected to the tenth One end of nine resistors R19 is connected to the corresponding pin of STM32F051C8T6 microcontroller U2, and the other ends of all nineteenth resistors R19 are connected and connected to +3.3V voltage.

The utility model greatly reduces the workload of daily maintenance and calibration, is simple to operate, can conveniently adjust the sensitivity of the sensor, increases the reliability of the transmitter, and achieves the purposes of facilitating processing, ensuring precision and reducing processing costs.

Description of drawings

Fig. 1 is the module schematic diagram of the present utility model;

Figure 2 is a circuit diagram of the STM32F051C8T6 basic system;

Figure 3 is a three-wire PT100 amplification circuit diagram;

Fig. 4 is a relay control circuit diagram;

Fig. 5 is a power interface circuit diagram;

Figure 6 is a 24V to 5V circuit diagram;

Figure 7 is a 5V to 3.3V circuit diagram;

Fig. 8 is a 3.3V reference circuit diagram;

Fig. 9 is a download interface circuit diagram;

Fig. 10 is a dot-matrix liquid crystal screen LED circuit diagram;

Fig. 11 is a circuit diagram of the button group.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figure 1-11, this embodiment proposes an intelligent temperature transmitter, including STM32F051C8T6 basic system 1, three-wire PT100 amplifier circuit 2, two sets of relay control circuits 3, power interface 4, 24V to 5V circuit 5, 5V to 3.3V circuit 6, 3.3V reference circuit 7, download interface 8, dot matrix LCD screen LED and button group, the three-wire PT100 amplifier circuit 2, relay control circuit 3, 3.3V reference circuit 7, dot matrix LCD screen The LED and button group are respectively connected to the corresponding pins of STM32F051C8T6 basic system 1. The power interface 4 provides 24V voltage for the relay RE24DC of the relay control circuit 3. The power interface 4 is the load of the relay control circuit 3 and the three-wire PT100 through the 24V to 5V circuit 5. Amplifying circuit 2 provides 5V voltage, power interface 4 provides 3.3V voltage for STM32F051C8T6 basic system 1 through 24V to 5V circuit 5 and 5V to 3.3V circuit 6, and 3.3V reference circuit 7 provides 3.3V DC voltage for STM32F051C8T6 basic system 1, The three-wire PT100 amplifier circuit (2) amplifies the collected temperature signal and sends it to the STM32F051C8T6 basic system 1, the relay control circuit 3 controls the power supply interface 4 on and off, and the download interface 8 provides a download function for the data processed by the STM32F051C8T6 basic system 1, At the same time, the data is retrieved through the key group and displayed on the LED on the dot matrix LCD screen.

Further, the STM32F051C8T6 basic system 1 is composed of STM32F051C8T6 single-chip microcomputer U2, pin 1 of STM32F051C8T6 single-chip microcomputer U2 is connected with one end of the first capacitor C1 and 3.3V voltage, the other end of the first capacitor C1 is grounded, and 5 pins of STM32F051C8T6 single-chip microcomputer U2 are connected with One end of the second crystal oscillator Y2 is connected to one end of the fifth capacitor C5, the other end of the fifth capacitor C5 is connected to one end of the sixth capacitor C6 and grounded, and the other end of the sixth capacitor C6 is connected to the other end of the second crystal oscillator Y2 and STM32F051C8T6 The pin 6 of the single-chip microcomputer U2 is connected, the pin 7 of the STM32F051C8T6 single-chip microcomputer U2 is connected with one end of the second resistor R2 and one end of the fourth capacitor C4, the other end of the second resistor R2 is connected to 3.3V voltage, and the other end of the fourth capacitor C4 is grounded. Pin 9 of STM32F051C8T6 MCU U2 is connected to 3.3V reference circuit 7, pin 11 of STM32F051C8T6 MCU U2 is connected to 3-wire PT100 amplifier circuit 2, pins 18-22, 25, 39-43, 45, and 46 of STM32F051C8T6 MCU U2 are respectively connected to point The corresponding pins of the array LCD screen LEDs are connected, the 23 pins of STM32F051C8T6 MCU U2 are connected to one end of the twelfth capacitor C12 and grounded, the other end of the twelfth capacitor C12 is connected to the 24 pins of STM32F051C8T6 MCU U2 and connected to 3.3V voltage, STM32F051C8T6 The 26-31 pins of the single-chip microcomputer U2 are respectively connected with the corresponding pins of the button group, the 32 and 33 pins of the STM32F051C8T6 single-chip microcomputer U2 are respectively connected with two sets of relay control circuits 3, and the 34 and 37 pins of the STM32F051C8T6 single-chip microcomputer U2 are respectively connected with the corresponding pins of the download interface 8 , The first resistor R1 is connected in series between pin 44 of STM32F051C8T6 microcontroller U2 and the ground, pin 47 of STM32F051C8T6 microcontroller U2 is connected in parallel with one end of the thirteenth capacitor C13, and the other end of the thirteenth capacitor C13 is connected to pin 48 of STM32F051C8T6 microcontroller U2 Connected and connected to 3.3V voltage.

Further, the three-wire PT100 amplifying circuit 2 is composed of first to fourth operational amplifiers U1-U4 and platinum thermal resistance S1, the non-inverting input terminal of the first operational amplifier U1 is connected to one end of the twentieth resistor R20 and the twentieth One end of the four resistors R24 is connected, the other end of the twentieth resistor R20 is connected to one end of the nineteenth resistor R19 and pins 1 and 3 of the voltage stabilizer T1, and the other end of the nineteenth resistor R19 is connected to +5V voltage for voltage stabilization The pin 2 of the source T1 is grounded, the other end of the twenty-fourth resistor R24 and one end of the twenty-eighth resistor R28, the anode of the third diode E3, one end of the thirtieth resistor R30, and one end of the thirty-first resistor R31 One end is connected, the other end of the twenty-eighth resistor R28 is connected to the output end of the first operational amplifier U1 and one end of the twenty-fifth resistor R25, and the other end of the twenty-fifth resistor R25 is connected to the inverting input of the first operational amplifier U1 One end of the twenty-first resistor R21 is connected, the other end of the twenty-first resistor R21 is grounded, the negative pole of the third diode E3 is connected to pin 1 of the platinum thermal resistance S1, and the other end of the thirtieth resistor R30 is connected to Pins 2 and 3 of the platinum thermal resistance S1 are connected and grounded, the other end of the thirty-first resistor R31 is connected to one end of the eighth capacitor C8, one end of the thirty-third resistor R33, one end of the thirty-fourth resistor R34 and the third The inverting input terminal of the operational amplifier U3 is connected, the other end of the eighth capacitor C8, the other end of the thirty-third resistor R33, the other end of the thirty-fourth resistor R34 and the output terminal of the third operational amplifier U3 are connected, and the second The non-inverting input terminal of the operational amplifier U2 is connected to one end of the twenty-second resistor R22 and one end of the twenty-sixth resistor R26, and the other end of the twenty-second resistor R22 is connected to pins 1 and 3 of the voltage regulator source T1, and the second The other end of the sixteenth resistor R26 is connected to one end of the twenty-ninth resistor R29, pin 1 of the platinum thermal resistor S1 and one end of the thirty-second resistor R32, and the other end of the twenty-ninth resistor R29 is connected to the second operational amplifier U2 The output terminal of the twenty-seventh resistor R27, the other end of the twenty-seventh resistor R27 is connected to the inverting input terminal of the second operational amplifier U2 and one end of the twenty-third resistor R23, and the twenty-third resistor R23 The other end of the thirty-second resistor R32 is connected to one end of the thirty-fifth resistor R35, one end of the thirty-sixth resistor R36, and the non-inverting input end of the third operational amplifier U3, and the thirty-fifth resistor R35 The other end of the third operational amplifier U3 is connected to the other end of the thirty-sixth resistor R36 and grounded, the output terminal of the third operational amplifier U3 is also connected to the non-inverting input terminal of the fourth operational amplifier U4, and the inverting input terminal of the fourth operational amplifier U4 is connected to the inverting input terminal of the fourth operational amplifier U4. The output terminals of the four operational amplifiers U4 are connected to one end of the thirty-seventh resistor R37, the pin 4 of the fourth operational amplifier U4 is connected to one end of the ninth capacitor C9 and connected to +5V voltage, the other end of the ninth capacitor C9 is grounded, A tenth capacitor C10 is connected in series between the other end of the thirty-seventh resistor R37 and the ground.

Further, the other end of the thirty-seventh resistor R37 of the three-wire PT100 amplifying circuit 2 is also connected to the LC filter circuit 21, and the LC filter circuit 21 is composed of the thirty-eighth resistor R38 and the eleventh capacitor C11. One end of the eighth resistor R38 is connected to the other end of the thirty-seventh resistor R37, the other end of the thirty-eighth resistor R38 is connected to one end of the eleventh capacitor C11 and pin 11 of the STM32F051C8T6 microcontroller U2, and the other end of the eleventh capacitor C11 One end is grounded.

Further, the two groups of relay control circuits 3 are composed of relay RE24DC, the pin 2 of the relay RE24DC is connected to the positive pole of the fifth diode D5 and connected to +24V voltage, the negative pole of the fifth diode D5 is connected to 1 pin of the relay RE24DC. pin and the collector of the fifth transistor Q5, the base of the fifth transistor Q5 is connected to one end of the twenty-sixth resistor R26, and the other end of the twenty-sixth resistor R26 is connected to the fourth transistor Q4 The collector is connected to one end of the twenty-eighth resistor R28, the other end of the twenty-eighth resistor R28 is connected to the collector of the fifth transistor Q5 and grounded, and the base of the fourth transistor Q4 is connected to the twenty-seventh transistor Q4. One end of the resistor R27 is connected to one end of the twenty-ninth resistor R29, the other end of the twenty-seventh resistor R27 is connected to the emitter of the fourth triode Q4 and connected to +5V voltage, the other end of the twenty-ninth resistor R29 32/33 pins with STM32F051C8T6 microcontroller U2.

Further, the power interface 4 is composed of a first capacitor C1, a second capacitor C2, a first diode D1 and a first connector J1, one end of the first capacitor C1 is connected to one end of the second capacitor C2 and connected to the power supply , the other end of the first capacitor C1 is connected to the positive pole of the first diode D1 and connected to +24V voltage, the negative pole of the first diode D1 is connected to the pin 3 of the first connector J1, and the other end of the second capacitor C2 is connected to the Pin 1 of the first connector J1 is grounded, and pin 2 of the first connector J1 outputs current.

Further, the 24V to 5V circuit 5 is composed of a fifth step-down switch-type integrated voltage regulator circuit U5, pin 1 of the fifth step-down switch-type integrated voltage regulator circuit U5 is connected to +24V voltage, and the fifth step-down switch-type integrated voltage regulator circuit U5 is connected to +24V voltage. The pins 3 and 5 of the voltage stabilizing circuit U5 are grounded, the third capacitor C3 and the first capacitor E1 are connected in parallel between pins 1 and 3 and pin 5 of the fifth step-down switch type integrated voltage stabilizing circuit U5, and the fifth step-down switch type integrated Pin 2 of the voltage stabilizing circuit U5 is connected to the anode of the second diode D2 and one end of the first inductor L1, the cathode of the second diode D2 is connected to the cathode of the second capacitor E2 and one end of the fourth capacitor C4 and grounded , the other end of the first inductor L1 is connected to the pin 4 of the fifth step-down switching integrated voltage regulator circuit U5, the positive pole of the second capacitor E2 and the other end of the fourth capacitor C4 to output +5V voltage;

Further, the 5V to 3.3V circuit 6 is composed of a first step-down switch-type integrated voltage regulator circuit U1, pin 3 of the first step-down switch-type integrated voltage regulator circuit U1 and one end of the seventeenth capacitor C17 and the fourth The positive pole of capacitor E4 is connected and connected to +5V voltage, the other end of the seventeenth capacitor C17 and the negative pole of the fourth capacitor E4 are connected and grounded, and pin 1 of the first step-down switching integrated voltage regulator circuit U1 is grounded, and the first step-down Pin 2 of the switch-type integrated voltage regulator circuit U1 is connected to pin 4 of the first step-down switch-type integrated voltage regulator circuit U1, the positive pole of the first capacitor E1, and one end of the eighth capacitor C8 to output a 3.3V voltage. The first capacitor E1 and the other end of the eighth capacitor C8 are connected and grounded;

Further, the 3.3V reference circuit 7 is composed of a first inductor L1, one end of the first inductor L1, one end of the fourteenth capacitor C14, one end of the seventh capacitor C7, the positive pole of the second capacitor E2 and the ninth resistor R9 One end of the ninth resistor R9 is connected to +3.3V voltage, the other end of the fourteenth capacitor C14 is connected to the negative pole of the third capacitor E3, the other end of the fifteenth capacitor C15, the other end of the seventh capacitor C7, The negative pole of the second capacitor E2 is connected to one end of the tenth resistor R10, the other end of the tenth resistor R10 is grounded, the other end of the first inductor L1 is connected to the positive pole of the third capacitor E3 and one end of the fifteenth capacitor C15 and connected to STM32F051C8T6 Pin 9 of MCU U2.

Further, the download interface 8 is composed of the eighth connector J8, the pin 1 of the eighth connector J8 is connected to one end of the third resistor R3 and grounded, the second pin of the eighth connector J8 is connected to the other end of the third resistor R3 One end is connected to pin 37 of STM32F051C8T6 microcontroller U2, pin 3 of the eighth connector J8 is connected to pin 34 of STM32F051C8T6 microcontroller U2 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to pin 4 of the eighth connector J8 Connect and connect +3.3V voltage.

Further, the 12-24 pins of the dot-matrix LCD screen LED are respectively connected to the corresponding pins of the STM32F051C8T6 single-chip microcomputer U2, the 1, 7, and 11 pins of the dot-matrix LCD screen LED are grounded, and the 6 and 10 pins of the dot-matrix LCD screen LED are connected to the ground. +3.3V voltage, there is a sixteenth capacitor C16 between pins 4 and 5, pins 2 and 3, and pin 1 and the ground of the dot-matrix LCD screen LED.

Further, the button group is composed of the first to sixth buttons K1-K6, one end of the first to sixth buttons K1-K6 is connected and grounded, and the other ends of the first to sixth buttons K1-K6 are connected to the tenth One end of nine resistors R19 is connected to the corresponding pin of STM32F051C8T6 microcontroller U2, and the other ends of all nineteenth resistors R19 are connected and connected to +3.3V voltage.

The utility model greatly reduces the workload of daily maintenance and calibration, is simple to operate, can conveniently adjust the sensitivity of the sensor, increases the reliability of the transmitter, and achieves the purposes of facilitating processing, ensuring precision and reducing processing costs.

For the limitation of the protection scope of the present utility model, those skilled in the art should understand that on the basis of the technical solution of the present utility model, various modifications or deformations that those skilled in the art can make without creative labor are still within the scope of the present utility model. within the scope of protection.

Claims (10)

1. a kind of Intellectual Thermal Transmitter, it is characterised in that：It includes STM32F051C8T6 fundamental systems (1), three-wire system PT100 amplifying circuits (2), two group relay control circuits (3), power interface (4), 24V turn 5V circuits (5), 5V turns 3.3V electricity Road (6), 3.3V reference circuits (7), download interface (8), lattice lcd screen LED and key group, the three-wire system PT100 amplifications electricity Road (2), control relay circuit (3), 3.3V reference circuits (7), lattice lcd screen LED and key group respectively with The correspondence foot of STM32F051C8T6 fundamental systems (1) is connected, and power interface (4) is the relay of control relay circuit (3) RE24DC provides 24V voltages, and power interface (4) turns the load and three that 5V circuits (5) are control relay circuit (3) by 24V Line PT100 amplifying circuits (2) provide 5V voltages, and power interface (4) turns 5V circuits (5) by 24V and 5V turns 3.3V circuits (6) 3.3V voltages are provided for STM32F051C8T6 fundamental systems (1), 3.3V reference circuits (7) are STM32F051C8T6 fundamental systems (1) DC voltage of 3.3V is provided, three-wire system PT100 amplifying circuits (2) are sent to after amplifying the temperature signal of acquisition STM32F051C8T6 fundamental systems (1), control relay circuit (3) control the break-make of power interface (4), and download interface (8) is Data provide download function after STM32F051C8T6 fundamental systems (1) processing, while by key group called data in dot matrix Liquid crystal display LED is shown.

2. Intellectual Thermal Transmitter according to claim 1, it is characterised in that：The STM32F051C8T6 fundamental systems (1) be made of STM32F051C8T6 microcontrollers U2, one end of 1 foot of STM32F051C8T6 microcontrollers U2 and the first capacitance C1 and 3.3V voltages are connected, the other end of the first capacitance C1 ground connection, 5 feet of STM32F051C8T6 microcontrollers U2 and the second crystal oscillator Y2's One end and one end of the 5th capacitance C5 are connected, and the other end of the 5th capacitance C5 is connected and is grounded with one end of the 6th capacitance C6, the The other end of six capacitance C6 is connected with 6 feet of the other end of the second crystal oscillator Y2 and STM32F051C8T6 microcontrollers U2, 7 feet of STM32F051C8T6 microcontrollers U2 are connected with one end of one end of second resistance R2 and the 4th capacitance C4, second resistance R2 Another termination 3.3V voltages, the other end ground connection of the 4th capacitance C4,9 feet of STM32F051C8T6 microcontrollers U2 and 3.3V bases Quasi- circuit (7) is connected, and 11 feet of STM32F051C8T6 microcontrollers U2 are connected with three-wire system PT100 amplifying circuits (2), The 18-22 of STM32F051C8T6 microcontrollers U2,25, the foot of 39-43,45,46 are connected with the corresponding foot of lattice lcd screen LED respectively, 23 feet of STM32F051C8T6 microcontrollers U2 are connected and are grounded with one end of the 12nd capacitance C12, and the 12nd capacitance C12's is another One end is connected with 24 feet of STM32F051C8T6 microcontrollers U2 and meets 3.3V voltages, the 26- of STM32F051C8T6 microcontrollers U2 31 feet are connected with the corresponding foot of key group respectively, 32,33 feet of STM32F051C8T6 microcontrollers U2 respectively with two group relay controls 34,37 feet of circuit (3) processed, STM32F051C8T6 microcontrollers U2 are connected with the corresponding foot of download interface (8) respectively, 47 feet of first resistor R1, STM32F051C8T6 microcontroller U2 are concatenated between 44 feet and ground of STM32F051C8T6 microcontrollers U2 With one end of the 13rd capacitance C13 and be connected, the other end of the 13rd capacitance C13 and the 48 of STM32F051C8T6 microcontrollers U2 Foot is connected and connects 3.3V voltages.

3. Intellectual Thermal Transmitter according to claim 1, it is characterised in that：The three-wire system PT100 amplifying circuits (2) It is made of first to fourth amplifier U1-U4 and platinum resistance thermometer sensor, S1, the in-phase input end of the first amplifier U1 and the 20th resistance R20's One end and one end of the 24th resistance R24 are connected, the other end of the 20th resistance R20 and one end of the 19th resistance R19 and 1,3 feet of source of stable pressure T1 are connected, another termination+5V voltages of the 19th resistance R19, the 2 feet ground connection of source of stable pressure T1, and the 24th One end of the other end of resistance R24 and the 28th resistance R28, the anode of third diode E3, the 30th resistance R30 one end And the 31st resistance R31 one end be connected, the output end and second of the other end of the 28th resistance R28 and the first amplifier U1 The inverting input of one end of 15 resistance R25, the other end of the 25th resistance R25 and the first amplifier U1 and the 21st electricity The one end for hindering R21 is connected, the other end ground connection of the 21st resistance R21, the cathode of third diode E3 and the 1 of platinum resistance thermometer sensor, S1 Foot is connected, and the other end of the 30th resistance R30 is connected and is grounded with 2,3 feet of platinum resistance thermometer sensor, S1, and the 31st resistance R31's is another The one end, one end of the 33rd resistance R33, one end of the 34th resistance R34 and third amplifier of one end and the 8th capacitance C8 The inverting input of U3 is connected, the other end of the 8th capacitance C8, the other end of the 33rd resistance R33, the 34th resistance R34 The other end and third amplifier U3 output end be connected, the in-phase input end of the second amplifier U2 and the one of the 22nd resistance R22 End and one end of the 26th resistance R26 are connected, and the other end of the 22nd resistance R22 is connected with 1,3 feet of source of stable pressure T1, the 1 foot and the 32nd resistance R32 of the other end of 26 resistance R26 and one end of the 29th resistance R29, platinum resistance thermometer sensor, S1 One end be connected, the one of the output end and the 27th resistance R27 of the other end of the 29th resistance R29 and the second amplifier U2 End, the other end of the 27th resistance R27 and the inverting input of the second amplifier U2 and one end phase of the 23rd resistance R23 Even, the other end ground connection of the 23rd resistance R23, the other end of the 32nd resistance R32 and the one of the 35th resistance R35 The in-phase input end at end, one end of the 36th resistance R36 and third amplifier U3 is connected, the other end of the 35th resistance R35 It is connected and is grounded with the other end of the 36th resistance R36, the output end of third amplifier U3 is also same mutually defeated with four high guaily unit U4 Enter end to be connected, one end phase of the inverting input of four high guaily unit U4 and the output end of four high guaily unit U4 and the 37th resistance R37 Even, 4 feet of four high guaily unit U4 are connected with one end of the 9th capacitance C9 and connect+5V voltages, and the other end of the 9th capacitance C9 is grounded, the The tenth capacitance C10 is concatenated between the other end and ground of 37 resistance R37.

4. Intellectual Thermal Transmitter according to claim 3, it is characterised in that：The three-wire system PT100 amplifying circuits (2) The other end of the 37th resistance R37 be also connected with LC filter circuits (21), LC filter circuits (21) are by the 38th resistance R38 With the 11st capacitance C11 compositions, one end of the 38th resistance R38 is connected with the other end of the 37th resistance R37, and the 30th The other end of eight resistance R38 is connected with 11 feet of one end of the 11st capacitance C11 and STM32F051C8T6 microcontrollers U2, and the tenth The other end of one capacitance C11 is grounded.

5. Intellectual Thermal Transmitter according to claim 1, it is characterised in that：The two group relays control circuit (3) It being made of relay RE24DC, 2 feet of relay RE24DC are connected with the anode of the 5th diode D5 and connect+24V voltages, the The cathode of five diode D5 is connected with the collector of 1 foot of relay RE24DC and the 5th triode Q5, the 5th triode Q5's Base stage is connected with one end of the 26th resistance R26, the collector of the other end and the 4th triode Q4 of the 26th resistance R26 And the 28th resistance R28 one end be connected, the other end of the 28th resistance R28 is connected with the collector of the 5th triode Q5 And be grounded, the base stage of the 4th triode Q4 is connected with one end of one end of the 27th resistance R27 and the 29th resistance R29, The other end of 27th resistance R27 is connected with the emitter of the 4th triode Q4 and meets+5V voltages, the 29th resistance R29 The other end and STM32F051C8T6 microcontrollers U2 32/33 foot.

6. Intellectual Thermal Transmitter according to claim 1, it is characterised in that：The power interface (4) is by the first capacitance C1, the second capacitance C2, the first diode D1 and the first connector J1 compositions, one end of the first capacitance C1 and the one of the second capacitance C2 End is connected and connects power supply, and the other end of the first capacitance C1 is connected with the anode of the first diode D1 and connects+24V voltages, and the one or two 3 feet of the cathode of pole pipe D1 and the first connector J1,1 foot of the other end of the second capacitance C2 and the first connector J1 are simultaneously grounded, The 2 foot output currents of first connector J1.

7. Intellectual Thermal Transmitter according to claim 1, it is characterised in that：The 24V turns 5V circuits (5) by the 5th drop 1 foot of the type that compresses switch integrated stable voltage circuit U5 compositions, the 5th step-down switching type integrated stable voltage circuit U5 connects+24V voltages, the 5th drop 3,5 feet of the type that compresses switch integrated stable voltage circuit U5 are grounded, 1 foot and 3,5 feet of the 5th step-down switching type integrated stable voltage circuit U5 it Between parallel connection third capacitance C3 and the first capacitance E1,2 feet and the second diode D2 of the 5th step-down switching type integrated stable voltage circuit U5 Anode be connected with one end of the first inductance L1, the cathode and the 4th capacitance C4 of the cathode of the second diode D2 and the second capacitance E2 One end be connected and be grounded, 4 feet of the other end of the first inductance L1 and the 5th step-down switching type integrated stable voltage circuit U5, second electricity The other end of the anode and the 4th capacitance C4 that hold E2 is connected and exports+5V voltages；

The 5V turns 3.3V circuits (6) and is made of the first step-down switching type integrated stable voltage circuit U1, and the first step-down switching type is integrated 3 feet of regulator circuit U1 are connected with the anode of one end of the 17th capacitance C17 and the 4th capacitance E4 and connect+5V voltages, and the 17th The cathode of the other end of capacitance C17 and the 4th capacitance E4 are connected and are grounded, 1 foot of the first step-down switching type integrated stable voltage circuit U1 Ground connection, 4 feet of 2 feet of the first step-down switching type integrated stable voltage circuit U1 and the first step-down switching type integrated stable voltage circuit U1, the The anode of one capacitance E1 and one end of the 8th capacitance C8 are connected and export 3.3V voltages, the cathode and the 8th capacitance of the first capacitance E1 The other end of C8 is connected and is grounded；

The 3.3V reference circuits (7) are made of the first inductance L1, one end of the first inductance L1 and the one of the 14th capacitance C14 End, one end of the 7th capacitance C7, the anode of the second capacitance E2 and the 9th resistance R9 one end be connected, the other end of the 9th resistance R9 Connect+3.3V voltages, the other end of the 14th capacitance C14 and the cathode of third capacitance E3, the other end of the 15th capacitance C15, the One end of the other end of seven capacitance C7, the cathode of the second capacitance E2 and the tenth resistance R10 is connected, the other end of the tenth resistance R10 Ground connection, the other end of the first inductance L1 are connected and connect with one end of the 15th capacitance C15 with the anode of third capacitance E3 9 feet of STM32F051C8T6 microcontrollers U2.

8. Intellectual Thermal Transmitter according to claim 1, it is characterised in that：The download interface (8) is patched by the 8th Part J8 composition, 1 foot of the 8th connector J8 are connected and are grounded with one end of 3rd resistor R3,2 feet of the 8th connector J8 and the The other end of three resistance R3 and 37 feet of STM32F051C8T6 microcontrollers U2 are connected, 3 feet of the 8th connector J8 with 34 feet of STM32F051C8T6 microcontrollers U2 and one end of the 4th resistance R4 are connected, and the other end of the 4th resistance R4 connects with the 8th 4 feet of plug-in unit J8 are connected and connect+3.3V voltages.

9. Intellectual Thermal Transmitter according to claim 1, it is characterised in that：The 12-24 feet of the lattice lcd screen LED It is connected respectively with the corresponding foot of STM32F051C8T6 microcontrollers U2,1,7, the 11 feet ground connection of lattice lcd screen LED, lattice lcd 6,10 feet of screen LED connect+3.3V voltages, have the tenth between 4,5 feet of lattice lcd screen LED, between 2,3 feet and 1 foot and ground Six capacitance C16.

10. Intellectual Thermal Transmitter according to claim 1, it is characterised in that：The key group is pressed by first to the 6th Key K1-K6 compositions, one end of the first to the 6th button K1-K6 are connected and are grounded, and the other end of the first to the 6th button K1-K6 is equal It is connected with the corresponding foot of one end of the 19th resistance R19 and STM32F051C8T6 microcontrollers U2, all 19th resistance R19's The other end is connected and connects+3.3V voltages.