Circuit for adjusting and displaying PN junction characteristic temperature parameters

Abstract

The utility model provides a circuit for regulating and displaying PN junction characteristic temperature parameters, which comprises an external power supply, a step-down module, a single chip microcomputer module, a nixie tube display module and an encoder module, the encoder module is an EC11 rotary encoder, the external power supply supplies power to the step-down module and the nixie tube display module, and the single chip microcomputer module is connected with the encoder module. The output end of the voltage reduction module is electrically connected with the input end of the single-chip microcomputer module and the input end of the encoder module, the output end of the encoder module is electrically connected with the input end of the single-chip microcomputer module, and the output end of the single-chip microcomputer module is electrically connected with the input end of the nixie tube display module. The rotary encoder can generate continuous input signals, is higher in precision compared with a potentiometer, is especially convenient for scenes needing continuous input, is better in effect, is excellent in performance, and is reliable in quality. The TM1640 is a special chip for LED drive control, is excellent in performance and reliable in quality, adopts two-wire system hardware SPI communication, adopts 8-segment * 16-bit common-cathode nixie tube output as a display mode, and is accurate and stable in display.

Description

Technical Field

[0001] The utility model relates to the field of physics teaching instruments, in particular to a circuit for adjusting and displaying temperature parameters of PN junction characteristics. Background Art

[0002] Among the many physical teaching instruments and other products on the market, due to the rapid development of digital circuits and the popularity of digital integrated circuits, there are many parameters involved in adjustment and display, but most of them use a combination of potentiometers and ordinary digital tubes to achieve the conversion between different orders of magnitude of parameters. However, this method makes the hardware circuit complex, the adjustable parameter precision is low, and the display result is not accurate enough. Therefore, the development of a circuit system for adjusting and displaying PN junction characteristic temperature parameters is an urgent problem to be solved. Summary of the invention

[0003] In view of this, the utility model aims to propose a circuit for adjusting and displaying the temperature parameters of PN junction characteristics. By optimizing and improving the volume and data accuracy, the convenience, aesthetics and accuracy of the instrument are improved, and the use scenarios of the instrument are broadened.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A circuit for adjusting and displaying PN junction characteristic temperature parameters, comprising an external power supply, a step-down module, a single-chip microcomputer module, a digital tube display module and an encoder module, wherein the external power supply supplies power to the step-down module and the digital tube display module, the output end of the step-down module is electrically connected to the input end of the single-chip microcomputer module and the encoder module, the output end of the encoder module is electrically connected to the input end of the single-chip microcomputer module, and the output end of the single-chip microcomputer module is electrically connected to the input end of the digital tube display module;

[0006] The encoder module is an EC11 rotary encoder, and the digital tube display module includes an LED drive control dedicated circuit, a level conversion chip and two 4-bit digital tubes. The output end of the level conversion chip is electrically connected to the input end of the LED drive control dedicated circuit, and the output end of the LED drive control dedicated circuit is electrically connected to the two 4-bit digital tubes.

[0007] Furthermore, the single-chip microcomputer module includes a 32 single-chip microcomputer, a crystal oscillator circuit, a 3.3V filter circuit, a program download circuit and a reset circuit. The output ends of the crystal oscillator circuit, the 3.3V filter circuit, the program download circuit and the reset circuit are respectively electrically connected to the input ends of the 32 single-chip microcomputer, and the output end of the 3.3V filter circuit is also electrically connected to the input ends of the program download circuit and the reset circuit. The target temperature value is set by the received encoder signal, and the LED drive control dedicated circuit of the digital tube display module is controlled by the hardware SPI to display the target temperature and real-time temperature.

[0008] Furthermore, the A1 interface and A2 interface of the level conversion chip in the digital tube display module are electrically connected to the PA15 interface and PC12 interface of the 32 single-chip microcomputer in the single-chip microcomputer module. The PA15 interface and PC12 interface are the data line and clock line interfaces between the 32 single-chip microcomputer and the digital tube display module. The level conversion chip converts the 3.3V signal of the single-chip microcomputer into a 5V signal adapted to the LED drive control dedicated circuit, thereby realizing the data output of the single-chip microcomputer to the digital tube display module.

[0009] Furthermore, the key interface of the encoder module is electrically connected to the PA8 interface of the 32 single-chip microcomputer in the single-chip microcomputer module, and the encoder A and B interfaces of the encoder module are electrically connected to the PC6 interface and PC7 interface of the 32 single-chip microcomputer in the single-chip microcomputer module. The key function of the encoder module is realized through the external interrupt function of the PA8 interface of the 32 single-chip microcomputer, and the encoder A and B interfaces of the encoder module are connected to the PC6 and PC7 of the 32 single-chip microcomputers, and the pulse counting is realized by configuring the encoder mode of the timer.

[0010] Furthermore, the step-down module is a DC5V to DC3.3V module, which provides a DC3.3V power supply, and the chip of the step-down module is SPX3819M5-L-3-3.

[0011] Furthermore, the single-chip microcomputer module is powered by DC3.3V provided by the step-down module, and the DC3.3V of the step-down module is connected to the 3.3V filter circuit of the single-chip microcomputer module.

[0012] Furthermore, the chip of the LED drive control dedicated circuit is TM1640, using two-wire hardware SPI communication, and a 0-ohm resistor is connected between TM1640 and the 4-digit digital tube.

[0013] Furthermore, the external power supply is a DC5V power supply.

[0014] Furthermore, the display mode of the digital tube display module is 8 segments×16 bits, and common cathode digital tube output.

[0015] Furthermore, the level conversion chip is RS0104YQ.

[0016] Compared with the prior art, the circuit for adjusting and displaying PN junction characteristic temperature parameters described in the present invention has the following advantages:

[0017] The rotary encoder can generate continuous input signals, which is more accurate than the potentiometer. It is especially convenient and effective for scenarios that require continuous input, with excellent performance and reliable quality.

[0018] TM1640 is a dedicated chip for LED drive control. It uses two-wire hardware SPI communication, the display mode is 8 segments × 16 bits, and the common cathode digital tube output is accurate and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0020] Figure 1 It is a circuit diagram of the single chip microcomputer module in the utility model;

[0021] Figure 2 It is a circuit diagram of the encoder module in the utility model;

[0022] Figure 3 It is a circuit diagram of the step-down module in the utility model;

[0023] Figure 4 It is a circuit diagram of the digital tube display module in the utility model;

[0024] Figure 5 It is a principle block diagram of the utility model;

[0025] Figure 6 It is the principle block diagram of the single chip microcomputer module in the utility model;

[0026] Figure 7 It is a principle block diagram of the digital tube display module in the utility model. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0028] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0030] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0031] like Figure 5 As shown, a circuit for adjusting and displaying PN junction characteristic temperature parameters includes an external DC5V power supply, a single-chip microcomputer module, a step-down module, a digital tube display module and an encoder module. The external power supply supplies power to the step-down module and the digital tube display module. The output end of the step-down module is electrically connected to the input end of the single-chip microcomputer module and the encoder module. The output end of the encoder module is electrically connected to the input end of the single-chip microcomputer module. The output end of the single-chip microcomputer module is electrically connected to the input end of the digital tube display module.

[0032] like Figure 2 As shown, the encoder module is an EC11 rotary encoder, which is a small high-precision rotary encoder with a push button function. It uses an independent digital signal to rotate the shaft to toggle the two switches in the encoder to send pulses so that the two switches are periodically opened and closed, thereby realizing two sets of periodic signal outputs with phase differences, generating a signal difference for the MCU to capture to realize the function, and the MCU recognizes the difference between the two sets of signals through programming to identify different signal inputs.

[0033] like Figure 4 As shown, the digital tube display module includes a dedicated LED drive control circuit, a level conversion chip and two 4-bit digital tubes, the output end of the level conversion chip is electrically connected to the input end of the dedicated LED drive control circuit, and the output end of the dedicated LED drive control circuit is electrically connected to the two 4-bit digital tubes. The level conversion chip is RS0104YQ, the dedicated LED drive control circuit is a TM1640 chip, which performs hardware SPI communication with the single-chip microcomputer, and the data and clock pins are connected correspondingly. A 0-ohm resistor is connected between the TM1640 chip and the digital tube to effectively limit the loop current and suppress noise.

[0034] like Figure 6 As shown, the single-chip microcomputer module includes a 32 single-chip microcomputer, a crystal oscillator circuit, a 3.3V filter circuit, a program download circuit and a reset circuit. The output ends of the crystal oscillator circuit, the 3.3V filter circuit, the program download circuit and the reset circuit are electrically connected to the input ends of the 32 single-chip microcomputer respectively, and the output end of the 3.3V filter circuit is also electrically connected to the input ends of the program download circuit and the reset circuit. The target temperature value is set by the received encoder signal, and the LED drive control dedicated circuit of the digital tube display module is controlled by the hardware SPI to display the target temperature and the real-time temperature.

[0035] like Figure 1 As shown, the 32 single-chip microcomputer is an STM32F103 single-chip microcomputer, which determines the corresponding action and value by receiving the signal of the encoder, and displays the data by controlling the driving control dedicated circuit of the digital tube through the hardware SPI.

[0036] like Figure 4 As shown, the A1 interface and A2 interface of the level conversion chip in the digital tube display module are electrically connected to the PA15 interface and PC12 interface of the 32 single-chip microcomputer in the single-chip microcomputer module. The PA15 interface and PC12 interface are the data line and clock line interfaces between the 32 single-chip microcomputer and the digital tube display module. The level conversion chip converts the 3.3V signal of the single-chip microcomputer into a 5V signal adapted to the LED drive control dedicated circuit, thereby realizing the data output of the single-chip microcomputer to the digital tube display module.

[0037] like Figure 2 As shown, the key interface of the encoder module is electrically connected to the PA8 interface of the 32 single-chip microcomputer in the single-chip microcomputer module, and the encoder A and B interfaces of the encoder module are electrically connected to the PC6 interface and PC7 interface of the 32 single-chip microcomputer in the single-chip microcomputer module. The key function of the encoder module is realized through the external interrupt function of the single-chip microcomputer PA8 interface, the encoder A and B interfaces of the encoder module are connected to the 32 single-chip microcomputer PC6 and PC7, and the pulse counting is realized by configuring the encoder mode of the timer.

[0038] like Figure 3As shown, the step-down module adopts an external DC5V power supply and supplies power to the output end of the RS0104YQ level conversion chip and the TM1640 digital tube driver chip. The step-down module DC5V to DC3.3V step-down chip provides a DC3.3V voltage for the input end of the RS0104YQ voltage conversion chip and the EC11 encoder. The chip of the step-down module is SPX3819M5-L-3-3.

[0039] The single-chip microcomputer module is powered by the DC3.3V provided by the buck module, and the DC3.3V of the buck module is connected to the 3.3V filter circuit of the single-chip microcomputer module. TM1640 is a dedicated chip for LED drive control, using two-wire hardware SPI communication, the display mode is 8 segments × 16 bits, common cathode digital tube output, and internally integrates RC oscillator, power-on reset circuit, automatic blanking circuit, MCU digital interface, data latch, LED high-voltage drive and other circuits, and the display is accurate and stable.

[0040] The working process of this example is: the temperature control box microcontroller measures the temperature of the PN junction heating device in real time through the temperature sensor and displays it on the digital tube; the microcontroller reads the signal difference generated by the EC11 rotary encoder to identify different target temperatures, and uses the heating sheet to make the PN junction heating device reach the target temperature, and the target temperature is displayed on the digital tube.

[0041] The two timer pins of the single-chip microcomputer are connected to the A and B pins of the EC11 rotary encoder, and a common pin is connected to the D pin of the EC11 rotary encoder. The EC11 rotary encoder rotates to realize two sets of periodic signal outputs with phase difference. The MCU captures the generated digital signal difference and displays different temperature data on the digital tube through programming to realize the temperature adjustment function. The data and clock signal pins of the single-chip microcomputer are connected to the input pins A1 and A2 of the RS0104YQ level conversion chip. The single-chip microcomputer uses the level conversion chip to convert the signal level from DC3.3V to the TM1640 adaptation level DC5V. The output pins B1 and B2 of the RS0104YQ level conversion chip are connected to the data and clock input pins of TM1640; the 8 segment selection pins of TM1640 are connected to the segment selection pins of LED1 and LED2 after connecting to 0Ω resistors, and the 4 bit selection pins of LED1 and LED2 are connected to the 8 bit selection pins of TM1640 to realize the data display function.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A circuit for adjusting and displaying PN junction characteristic temperature parameters, characterized in that: It includes an external power supply, a step-down module, a single-chip computer module, a digital tube display module and an encoder module, wherein the external power supply supplies power to the step-down module and the digital tube display module, the output end of the step-down module is electrically connected to the input end of the single-chip computer module and the encoder module, the output end of the encoder module is electrically connected to the input end of the single-chip computer module, and the output end of the single-chip computer module is electrically connected to the input end of the digital tube display module; The encoder module is an EC11 rotary encoder, and the digital tube display module includes an LED drive control dedicated circuit, a level conversion chip and two 4-bit digital tubes. The output end of the level conversion chip is electrically connected to the input end of the LED drive control dedicated circuit, and the output end of the LED drive control dedicated circuit is electrically connected to the two 4-bit digital tubes.

2. A circuit for adjusting and displaying PN junction characteristic temperature parameters according to claim 1, characterized in that: The single-chip microcomputer module includes a 32 single-chip microcomputer, a crystal oscillator circuit, a 3.3V filter circuit, a program download circuit and a reset circuit. The output ends of the crystal oscillator circuit, the 3.3V filter circuit, the program download circuit and the reset circuit are electrically connected to the input ends of the 32 single-chip microcomputer respectively, and the output end of the 3.3V filter circuit is also electrically connected to the input ends of the program download circuit and the reset circuit.

3. A circuit for adjusting and displaying PN junction characteristic temperature parameters according to claim 2, characterized in that: The A1 interface and the A2 interface of the level conversion chip in the digital tube display module are electrically connected to the PA15 interface and the PC12 interface of the 32 single-chip microcomputer in the single-chip microcomputer module.

4. A circuit for adjusting and displaying PN junction characteristic temperature parameters according to claim 3, characterized in that: The key interface of the encoder module is electrically connected to the PA8 interface of the 32 single-chip microcomputer in the single-chip microcomputer module, and the encoder A and B interfaces of the encoder module are electrically connected to the PC6 and PC7 interfaces of the 32 single-chip microcomputer in the single-chip microcomputer module.

5. A circuit for adjusting and displaying PN junction characteristic temperature parameters according to claim 1, characterized in that: The step-down module is a DC5V to DC3.3V module, which provides a DC3.3V power supply. The chip of the step-down module is SPX3819M5-L-3-3.

6. A circuit for adjusting and displaying PN junction characteristic temperature parameters according to claim 1, characterized in that: The single-chip microcomputer module is powered by the DC3.3V provided by the step-down module, and the DC3.3V of the step-down module is connected to the 3.3V filter circuit of the single-chip microcomputer module.

7. A circuit for adjusting and displaying PN junction characteristic temperature parameters according to claim 1, characterized in that: The chip of the LED drive control dedicated circuit is TM1640, which uses two-wire hardware SPI communication, and a 0-ohm resistor is connected between TM1640 and the 4-digit digital tube.

8. A circuit for adjusting and displaying PN junction characteristic temperature parameters according to claim 1, characterized in that: The external power supply is a DC5V power supply.

9. A circuit for adjusting and displaying PN junction characteristic temperature parameters according to claim 1, characterized in that: The display mode of the digital tube display module is 8 segments×16 bits, and common cathode digital tube output.

10. A circuit for adjusting and displaying PN junction characteristic temperature parameters according to claim 1, characterized in that: The level conversion chip is RS0104YQ.

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