Impulse sensor bias voltage adjustment circuit

Abstract

The utility model relates to a kind of impulse sensor bias voltage regulating circuit, comprising: digital potentiometer;Signal acquisition circuit, for collecting the sensing signal output by impulse sensor;Amplification circuit, for generating bias voltage under the cooperation of digital potentiometer, and the sensing signal is amplified, and amplified signal is obtained;Single-chip microcomputer, for configuring the resistance of digital potentiometer to adjust the bias voltage, and bias voltage is based on the internal processing of amplified signal.The utility model can ensure that electronic device works at constant static operating point by the cooperation of digital potentiometer and amplification circuit, avoid instability caused by temperature change, power fluctuation or component parameter drift;Bias voltage can eliminate zero error and DC offset at the same time, reduce the baseline deviation of output signal;In addition, different bias voltage can be set according to crop type, that is, the data of different crops can be classified and arranged, which is beneficial to subsequent data analysis.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuits, specifically to an impulse sensor bias voltage adjustment circuit. Background Technology

[0002] Crop yield measurement systems can obtain spatial distribution information of crop yield, which mainly consists of geographical location, area, and crop yield. Among these, crop flow sensors, used to obtain crop yield, are the core element of the system. Currently, crop flow sensors mainly include photoelectric, volumetric, mass-based, and impulse types. Crop yield measurement systems using impulse-type crop flow sensors (hereinafter referred to as impulse sensors) are called impulse yield monitoring systems. Compared to others, impulse sensors have advantages such as low cost, easy installation, easy maintenance, reliable operation, and low requirements for the working environment; however, the influence of factors such as harvester vibration (mechanical vibration factor), terrain (slope angle), temperature drift of the impulse sensor (inherent sensor characteristic), and crop type makes it difficult to improve the yield measurement accuracy and stability (maintaining high accuracy each time, without sudden fluctuations) and robustness of the impulse yield measurement system. Utility Model Content

[0003] This invention provides an impulse sensor bias voltage adjustment circuit to solve at least one of the above-mentioned technical problems.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A bias voltage adjustment circuit for an impulse sensor, comprising: Digital potentiometer; A signal acquisition circuit is connected to an impulse sensor and is used to acquire the sensing signal output by the impulse sensor. An amplifier circuit, connected to the signal acquisition circuit and the digital potentiometer, is used to generate a bias voltage with the cooperation of the digital potentiometer and to amplify the sensing signal to obtain an amplified signal. A microcontroller is connected to the amplifier circuit and the digital potentiometer, used to configure the resistance value of the digital potentiometer to adjust the bias voltage, and to perform internal processing on the amplified signal based on the bias voltage.

[0005] Based on the above technical solution, the present invention can be further improved as follows.

[0006] Furthermore, the microcontroller is connected to the amplifier circuit via an ADC interface.

[0007] Furthermore, the microcontroller is connected to the digital potentiometer via an SPI interface.

[0008] Furthermore, the digital potentiometer includes: The digital potentiometer chip based on SPI communication has its CS# pin connected to the microcontroller to receive the chip select signal, its SCK pin connected to the microcontroller to receive the serial clock, its SI pin connected to the microcontroller to receive the serial data, its VSS pin and PA0 pin grounded, its VDD pin connected to +5V voltage, and its PW0 pin connected to the amplifier circuit. The first resistor has one end connected to the PB0 pin of the digital potentiometer chip and the other end connected to a +5V voltage. The first capacitor has one end connected to the other end of the first resistor, and the other end grounded.

[0009] Furthermore, the digital potentiometer chip is model MCP41010.

[0010] Furthermore, the microcontroller is connected to the digital potentiometer via an I2C interface.

[0011] Furthermore, the digital potentiometer includes: The digital potentiometer chip based on I2C communication has its SCL pin connected to the microcontroller to receive the serial clock, its SDA pin connected to the microcontroller to receive the serial data, its B pin, AD0 pin and GND pin grounded, its W pin connected to the amplifier circuit, and its VDD pin connected to +5V voltage. The first resistor has one end connected to pin A of the digital potentiometer chip and the other end connected to a +5V voltage. The first capacitor has one end connected to the VDD pin of the digital potentiometer chip and the other end grounded.

[0012] Furthermore, the digital potentiometer chip is model MCP4017T.

[0013] Furthermore, the amplification circuit includes: The four-channel operational amplifier chip has its 1IN+ pin connected to the impulse sensor to receive the first sensing signal, its 1IN- pin connected to the impulse sensor to receive the second sensing signal, its 1OUT pin connected to its 1IN- pin, its 2OUT pin connected to its 2IN- pin, its VDD+ pin connected to the supply voltage, its VDD- pin grounded, its 3IN+ pin connected to its 2OUT pin, its 4IN- pin connected to the first reference signal, and its 4OUT pin connected to its 4IN- pin. The second resistor has one end connected to the 1OUT pin of the four-channel operational amplifier chip, and the other end outputs the first amplified signal and is connected to the microcontroller. The third resistor has one end connected to the other end of the second resistor, and the other end grounded. The second capacitor is connected in parallel with the third resistor; The third capacitor has one end connected to the 1IN+ pin of the four-channel operational amplifier chip and the other end grounded. The fourth resistor is connected at one end to the 1OUT pin of the four operational amplifier chip; The fifth resistor has one end connected to the other end of the fourth resistor, and the other end connected to the 2IN+ pin of the four-channel operational amplifier chip. The fourth capacitor has one end connected to the other end of the fifth resistor, and the other end grounded. The fifth capacitor has one end connected to the other end of the fourth resistor and the other end connected to the 2IN pin of the four-channel operational amplifier chip. The sixth resistor has one end connected to the other end of the fifth capacitor, and the other end outputs the second amplified signal and is connected to the microcontroller. The seventh resistor has one end connected to the other end of the sixth resistor, and the other end grounded. The sixth capacitor is connected in parallel with the seventh resistor; The seventh capacitor has one end connected to the 4IN+ pin of the four-channel operational amplifier chip, and the other end grounded. The eighth resistor has one end connected to the 4IN+ pin of the four-channel operational amplifier chip and the other end connected to the first reference signal. The ninth resistor is connected at one end to the digital potentiometer and at the other end to the 3IN pin of the four-channel operational amplifier chip. The tenth resistor has one end connected to the other end of the ninth resistor; The eleventh resistor has one end connected to the other end of the tenth resistor and the other end connected to the 3OUT pin of the four-channel operational amplifier chip. The twelfth resistor has one end connected to the other end of the eleventh resistor, and the other end outputs the bias voltage and is connected to the microcontroller. The thirteenth resistor has one end connected to the other end of the twelfth resistor, and the other end grounded. The eighth capacitor is connected in parallel with the thirteenth resistor.

[0014] Furthermore, the model number of the four operational amplifier chip is TLC2274IPWR.

[0015] The beneficial effects of this utility model are as follows: The impulse sensor bias voltage adjustment circuit of this utility model outputs a bias voltage through the cooperation of a digital potentiometer and an amplifier circuit, and adjusts this bias voltage via a microcontroller. This ensures that the electronic components operate at a constant static operating point, avoiding instability caused by temperature changes, power fluctuations, or component parameter drift, thereby improving the linearity and reliability of the circuit. Simultaneously, the bias voltage can eliminate zero-point error and DC offset, reduce the baseline deviation of the output signal, and improve measurement accuracy and the accuracy of the control system. Furthermore, different bias voltages can be set according to the type of crop, allowing for the classification and organization of data from different crops, facilitating subsequent data analysis and improving the model building and subsequent data analysis and organization performance of the impulse crop yield measurement system. Attached Figure Description

[0016] Figure 1 This is a structural block diagram of an impulse sensor bias voltage adjustment circuit according to the present invention. Figure 2 This is a schematic diagram of a bias voltage adjustment circuit for an impulse sensor according to this utility model; Figure 3 This is another schematic diagram of the bias voltage adjustment circuit for an impulse sensor according to this utility model. Detailed Implementation

[0017] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0018] like Figure 1 As shown, an impulse sensor bias voltage adjustment circuit includes: Digital potentiometer; A signal acquisition circuit is connected to an impulse sensor and is used to acquire the sensing signal output by the impulse sensor. An amplifier circuit, connected to the signal acquisition circuit and the digital potentiometer, is used to generate a bias voltage with the cooperation of the digital potentiometer and to amplify the sensing signal to obtain an amplified signal. A microcontroller is connected to the amplifier circuit and the digital potentiometer, used to configure the resistance value of the digital potentiometer to adjust the bias voltage, and to perform internal processing on the amplified signal based on the bias voltage.

[0019] This invention discloses a bias voltage adjustment circuit for an impulse sensor. Through the cooperation of a digital potentiometer and an amplifier circuit, a bias voltage is output, which is then adjusted by a microcontroller. This ensures that the electronic components operate at a constant static operating point, avoiding instability caused by temperature changes, power fluctuations, or component parameter drift, thereby improving the circuit's linearity and reliability. Simultaneously, the bias voltage eliminates zero-point error and DC offset, reducing baseline deviation of the output signal and improving measurement accuracy and the accuracy of the control system. Furthermore, different bias voltages can be set according to the type of crop, allowing for the classification and organization of data from different crops, facilitating subsequent data analysis and improving the model building and subsequent data analysis and processing performance of the impulse-based crop yield measurement system.

[0020] In some embodiments, the microcontroller is connected to the amplifier circuit via an ADC interface.

[0021] In some embodiments, the microcontroller is connected to the digital potentiometer via an SPI interface.

[0022] like Figure 2 As shown, the digital potentiometer includes: The digital potentiometer chip U1 based on SPI communication, model MCP41010, has its CS# pin connected to the microcontroller to receive the chip select signal SPI_CS, its SCK pin connected to the microcontroller to receive the serial clock SPI_SCK, its SI pin connected to the microcontroller to receive the serial data SPI_MOSI, its VSS and PA0 pins grounded, its VDD pin connected to +5V voltage, and its PW0 pin connected to the amplifier circuit. The first resistor R1 is connected at one end to the PB0 pin of the digital potentiometer chip U1, and at the other end to a +5V voltage. The first capacitor C1 has one end connected to the other end of the first resistor R1, and the other end grounded.

[0023] In other embodiments, the microcontroller is connected to the digital potentiometer via an I2C interface.

[0024] like Figure 3 As shown, the digital potentiometer includes: The digital potentiometer chip U1 based on I2C communication, model MCP4017T, has its SCL pin connected to the microcontroller to receive the serial clock I2C_SCL, its SDA pin connected to the microcontroller to receive the serial data I2C_SDA, its B pin, AD0 pin and GND pin grounded, its W pin connected to the amplifier circuit, and its VDD pin connected to +5V voltage. The first resistor R1 is connected at one end to pin A of the digital potentiometer chip U1, and at the other end to a +5V voltage. The first capacitor C1 has one end connected to the VDD pin of the digital potentiometer chip U1, and the other end grounded.

[0025] In some embodiments, such as Figure 2 or Figure 3 As shown, the amplifier circuit includes: The four-channel operational amplifier chip U2, model TLC2274IPWR, has its 1IN+ pin connected to the impulse sensor to receive the first sensing signal ADOUT1, its 1IN- pin connected to the impulse sensor to receive the second sensing signal ADOUT2, its 1OUT pin connected to its 1IN- pin, its 2OUT pin connected to its 2IN- pin, its VDD+ pin connected to the supply voltage VDD+, its VDD- pin grounded, its 3IN+ pin connected to its 2OUT pin, its 4IN- pin connected to the first reference signal REF0, and its 4OUT pin connected to its 4IN- pin. The second resistor R2 is connected at one end to the 1OUT pin of the four-channel operational amplifier chip U2, and at the other end outputs the first amplified signal INMCUAD1 and is connected to the microcontroller. The third resistor R3 has one end connected to the other end of the second resistor R2, and the other end grounded. The second capacitor C2 is connected in parallel with the third resistor R3; The third capacitor C3 has one end connected to the 1IN+ pin of the four-channel operational amplifier chip U2, and the other end grounded. The fourth resistor R4 is connected at one end to the 1OUT pin of the four-channel operational amplifier chip U2; The fifth resistor R5 is connected at one end to the other end of the fourth resistor R4, and at the other end to the 2IN+ pin of the four-channel operational amplifier chip U2. The fourth capacitor C4 has one end connected to the other end of the fifth resistor R5, and the other end grounded. The fifth capacitor C5 is connected at one end to the other end of the fourth resistor R4, and at the other end to the 2IN- pin of the four-channel operational amplifier chip U2; The sixth resistor R6 is connected at one end to the other end of the fifth capacitor C5, and at the other end it outputs the second amplified signal INMCUAD2 and is connected to the microcontroller. The seventh resistor R7 has one end connected to the other end of the sixth resistor R6, and the other end grounded. The sixth capacitor C6 is connected in parallel with the seventh resistor R7; The seventh capacitor C7 is connected at one end to the 4IN+ pin of the four-channel operational amplifier chip U2, and at the other end to ground; The eighth resistor R8 is connected at one end to the 4IN+ pin of the four-channel operational amplifier chip U2, and at the other end to the first reference signal REF1; The ninth resistor R9 is connected at one end to the digital potentiometer and at the other end to the 3IN- pin of the four-channel operational amplifier chip U2; The tenth resistor R10 is connected at one end to the other end of the ninth resistor R9; The eleventh resistor R11 is connected at one end to the other end of the tenth resistor R10, and at the other end to the 3OUT pin of the four-channel operational amplifier chip U2. The twelfth resistor R12 is connected at one end to the other end of the eleventh resistor R11, and the other end outputs the bias voltage INMCUAD3 and is connected to the microcontroller. The thirteenth resistor R13 has one end connected to the other end of the twelfth resistor R12, and the other end grounded. The eighth capacitor C8 is connected in parallel to the thirteenth resistor R13.

[0026] In this invention, the signal acquisition circuit acquires the sensing signal output by the impulse sensor, that is, the tiny signal of crops hitting the impact plate; the amplification circuit amplifies the tiny impact force signal acquired by the signal acquisition circuit, enabling the microcontroller to better process the acquired signal; the digital potentiometer can be configured with its internal register via SPI or I2C communication to change its resistance value; the microcontroller configures the resistance value of the digital potentiometer via SPI or I2C communication, and the digital potentiometer, combined with the amplification circuit, can change the bias voltage.

[0027] In this invention, by adding a bias voltage to the circuit, the electronic components can be ensured to operate at a constant static operating point, avoiding instability caused by temperature changes, power fluctuations, or component parameter drift. This improves the linearity and reliability of the circuit, eliminates the influence of zero-point error and DC offset, and makes the measurement data more accurate, which is beneficial for data analysis. Furthermore, the bias voltage can be adjusted according to the type of crop, allowing data to be categorized according to the magnitude of the bias voltage (i.e., categorized by the corresponding crop). This makes the data easier to organize and facilitates future data analysis. It eliminates the need to record what crops were harvested at specific times each day; only the bias voltage needs to be observed, making the process convenient and quick.

[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An impulse sensor bias voltage adjustment circuit, characterized by, The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor.

2. The impulse sensor bias voltage adjustment circuit of claim 1, wherein, The application relates to a pulse sensor.

3. The impulse sensor bias voltage adjustment circuit of claim 1, wherein, The application relates to a pulse sensor.

4. The impulse sensor bias voltage adjustment circuit of claim 3, wherein, The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor.

5. The impulse sensor bias voltage adjustment circuit of claim 4, wherein, The application relates to a pulse sensor.

6. The impulse sensor bias voltage adjustment circuit of claim 1, wherein, The application relates to a pulse sensor.

7. The impulse sensor bias voltage adjustment circuit of claim 6, wherein, The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor.

8. The impulse sensor bias voltage adjustment circuit of claim 7, wherein, The application relates to a pulse sensor.

9. The impulse sensor bias voltage adjustment circuit of claim 1, wherein, The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. The application relates to a pulse sensor. 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The application relates to a The fifth resistor has one end connected to the other end of the fourth resistor and the other end connected to the 2IN+ pin of the four-way operational amplifier chip; The fourth capacitor has one end connected to the other end of the fifth resistor and the other end grounded; The fifth capacitor has one end connected to the other end of the fourth resistor and the other end connected to the 2IN- pin of the four-way operational amplifier chip; The sixth resistor has one end connected to the other end of the fifth capacitor and the other end outputting a second amplified signal and connected to the single-chip microcomputer; The seventh resistor has one end connected to the other end of the sixth resistor and the other end grounded; The sixth capacitor is connected in parallel to the seventh resistor; The seventh capacitor has one end connected to the 4IN+ pin of the four-way operational amplifier chip and the other end grounded; The eighth resistor has one end connected to the 4IN+ pin of the four-way operational amplifier chip and the other end connected to the first reference signal; The ninth resistor has one end connected to the digital potentiometer and the other end connected to the 3IN- pin of the four-way operational amplifier chip; The tenth resistor has one end connected to the other end of the ninth resistor; The eleventh resistor has one end connected to the other end of the tenth resistor and the other end connected to the 3OUT pin of the four-way operational amplifier chip; The twelfth resistor has one end connected to the other end of the eleventh resistor and the other end outputting the bias voltage and connected to the single-chip microcomputer; The thirteenth resistor has one end connected to the other end of the twelfth resistor and the other end grounded; The eighth capacitor is connected in parallel to the thirteenth resistor.

10. The impulse sensor bias voltage adjustment circuit of claim 9, wherein, The four-way operational amplifier chip is of the model TLC2274IPWR.

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