An automatic measurement system for moisture content in meat

Abstract

The present application discloses an automatic measurement system for the moisture content of meat, which belongs to the field of measurement technology. The automatic measurement system includes a power module, a digital module, an analog module and a lithium battery charging module. The power module provides power for the digital module and the analog module. The analog module is used to detect the moisture content of meat and convert the collected moisture content of meat into different electrical signals. The digital module is connected to the analog module to process and convert the analog electrical signals collected by the analog module. The lithium battery charging module is used to charge the lithium battery power supply in the measurement system. The measurement system automatically collects the attenuated electrical signals in raw meat and converts them into stable DC signals through buffering, rectification and filtering. The system has the advantages of strong anti-interference ability, few usage restrictions and high measurement accuracy.

Description

Technical Field

[0001] The invention relates to an automatic measuring system for the water content of meat, belonging to the technical field of measurement. Background Art

[0002] In recent years, with the improvement of living standards of urban and rural people, people have higher and higher requirements for the quality of fresh meat. The moisture content directly affects the processing, storage, trade and consumption of fresh meat of livestock and poultry. If the moisture content of meat is too high, bacteria and mold will multiply more, which will easily cause the deterioration of meat. Dehydration and shrinkage will not only make the meat lose weight, but also cause direct economic losses to industrial and commercial business owners, but also affect the color, flavor and tissue state of the meat, and cause fat oxidation. At present, the meat moisture detection methods used in the meat industry are mainly: 1. Infrared drying equipment to detect the moisture content of meat; 2. Use conductivity to detect the moisture content of meat; The first method to detect the moisture content of meat requires a specific place and specific personnel to carry out, and it takes a long time and consumes more energy. The second detection method has limited detection accuracy. Therefore, the technicians in this field provide an automatic measurement system for the moisture content of meat to solve the problems raised in the above background technology.

[0003] For example, on July 7, 2020, a publication number CN111380921A was disclosed, a meat moisture detector and detection method based on bioelectrical impedance, including a test electrode, an analog front end, an MCU, a display module and a power module; the test electrode includes an excitation electrode and a detection electrode, and the excitation electrode and the detection electrode are respectively arranged at both ends of the meat to be tested; the analog front end is used to accept the control of the MCU to pass an excitation current into the excitation electrode, and receive and process the detection voltage at the detection electrode to obtain the amplitude and phase of the detection voltage for sending to the MCU; the MCU is used to control the analog front end, and calculate the impedance of the meat to be tested according to the amplitude and phase of the received detection voltage to obtain the moisture content of the meat to be tested for sending to the display module; the display module is used to realize the display of corresponding data, and the power module is used to provide power. The present invention is easy to carry and easy to use. Although the above invention can realize the rapid measurement of meat moisture, it still has the following disadvantages:

[0004] The above invention relies on the voltage value between the two probes to obtain the water content of the meat. When the resistance between the two is larger, the voltage value is larger, and vice versa. There are many factors that affect the resistance between the two probes, such as the size of the meat, the pH value of the meat, the temperature of the meat, and the humidity of the cutting board on which the meat is placed. Therefore, the measurement result of the above invention will be affected by many factors, and the measurement accuracy is not very high. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an automatic measurement system for the moisture content of meat in view of the above shortcomings. According to the AC impedance method, a circuit for rapid and high-precision detection of the moisture content of meat is designed in the measurement system, which can quickly detect the moisture content of raw meat within 5 seconds with an accuracy of + / -5%.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] An automatic measurement system for the moisture content of meat, comprising a power module, a digital module, an analog module and a lithium battery charging module, wherein the power module provides power for the digital module and the analog module, the analog module is used to detect the moisture content of meat and convert the collected moisture content of meat into different electrical signals, the power management module comprises a 3V power supply circuit and a 2.5V power supply circuit, the analog module comprises a Wen's oscillation circuit, a transmitting and precision rectifying circuit, and a filtering circuit, wherein the Wen's oscillation circuit is connected to the transmitting and precision rectifying circuit, and the transmitting and precision rectifying circuit is connected to the filtering circuit;

[0008] The digital module is connected to the filter circuit in the analog module to process and transform the analog electrical signal collected by the analog module. The lithium battery charging module is used to charge the lithium battery power supply in the detector.

[0009] Further, the 3V power supply circuit includes a chip U6, the model of the chip U6 is BL9309, the 4th pin of the chip U6 is connected to one end of the capacitor C17 and the VBAT power supply, the other end of the capacitor C17 is connected to the ground line, the 6th pin of the chip U6 is connected to one end of the resistor R25 and one end of the resistor R27, the other end of the resistor R25 is connected to the VCC3V power line, the other end of the resistor R27 is connected to the ground line, the 3rd pin of the chip U6 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to one end of the capacitor C19, one end of the capacitor C20 and the VCC3V power line, the other end of the capacitor C19 and the other end of the capacitor C20 are connected to the ground line, pin 2 of chip U6 is connected to one end of resistor R33 and the ground line, the other end of resistor R33 is connected to pin 3 of transistor Q1 and pin 1 of chip U6, pin 2 of transistor Q1 is connected to VBAT power supply and one end of resistor R31, the other end of resistor R31 is connected to pin 1 of transistor Q1, pin 2 of transistor Q2 and one end of diode D7, pin 1 of transistor Q2 is connected to pin 22 of chip U1 and one end of resistor R32, the other end of resistor R32 is connected to the ground line and pin 3 of transistor Q2, the other end of diode D7 is connected to one end of diode D8, and the other end of diode D8 is connected to pin 23 of chip U1.

[0010] Further, the 2.5V power supply circuit includes a chip U5, the model of the chip U5 is LM27762DSSR, the 1st, 4th and 13th pins of the chip U5 are connected to the ground wire, the 2nd pin of the chip U5 is connected to one end of the resistor R23 and one end of the resistor R24, the other end of the resistor R23 is connected to the VCC2.5V power supply, the other end of the resistor R24 ​​is connected to the ground wire, the 3rd pin of the chip U5 is connected to the VCC3V power supply and one end of the capacitor C23, the other end of the capacitor C23 is connected to the ground wire, the 5th pin of the chip U5 is connected to one end of the capacitor C25, the other end of the capacitor C25 is connected to the ground wire, and the Pin 6 of chip U5 is connected to one end of capacitor C26, and the other end of capacitor C26 is connected to ground. Pin 7 of chip U5 is connected to one end of resistor R26 and one end of resistor R28. The other end of resistor R26 is connected to negative VCC2.5V power supply, and the other end of resistor R28 is connected to ground. Pin 8 of chip U5 is connected to pin 19 of chip U1. Pin 9 of chip U5 is connected to one end of capacitor C24, and the other end of capacitor C24 is connected to pin 10 of chip U5. Pin 11 of chip U5 is connected to one end of capacitor C22, and the other end of capacitor C22 is connected to ground. Pin 12 of chip U5 is connected to pin 19 of chip U1.

[0011] Further, the Wen oscillation circuit includes a chip U2, the model of chip U2 is TLV9062, pin 1 of chip U2 is connected to one end of resistor R4, one end of resistor R7, one end of diode D4 and one end of diode D5, the other end of resistor R7, the other end of diode D4 and the other end of diode D5 are connected to one end of resistor R14, the other end of resistor R14 is connected to one end of resistor R15 and pin 2 of chip U2, the other end of resistor R15 is grounded, the other end of resistor R4 is connected to one end of capacitor C6, the other end of capacitor C6 is connected to one end of resistor R8, one end of capacitor C7 and pin 3 of chip U2, the other end of resistor R8 and the other end of capacitor C7 are connected to ground, pin 4 of chip U2 is connected to negative VCC2.5V power supply, pin 5 of chip U2 is connected to one end of resistor R9, the other end of resistor R9 is connected to ground, and pin 8 of chip U2 is connected to VCC2.5V power supply.

[0012] Further, the transmitting and precision rectification circuit includes a chip U3, the model of chip U3 is RS8752XM, pin 1 of chip U3 is connected to one end of diode D3 and one end of diode D1, the other end of diode D3 is connected to pin 2 of resistor R5, one end of resistor R10 and pin 2 of chip U3, the other end of diode D1 is connected to pin 1 of resistor R5, the other end of resistor R10 is connected to pin 6 and pin 7 of chip U2, pin 3 and pin 5 of chip U3 are connected to ground, pin 4 of chip U3 is connected to a negative VCC2.5V power supply, pin 6 of chip U3 is connected to one end of resistor R13, pin 2 of resistor R6 and one end of diode D6, the other end of resistor R13 is connected to pin 1 of chip U2, pin 1 of resistor R6 is connected to one end of diode D2, the other end of diode D2 and the other end of diode D6 are connected to pin 7 of chip U3, and pin 8 of chip U3 is connected to VCC2.5V power supply.

[0013] Further, the filtering circuit includes a chip U4, the model of chip U4 is TLV9062, pin 1 of chip U4 is connected to one end of resistor R11 and one end of resistor R17, the other end of resistor R11 is connected to one end of capacitor C12 and one end of resistor R12, the other end of capacitor C12 is connected to ground, the other end of resistor R12 is connected to pin 12 of chip U1 and one end of capacitor C13, the other end of capacitor C13 is connected to ground, the other end of resistor R17 is connected to pin 2 of chip U4 and one end of resistor R16, the other end of resistor R16 is connected to pin 6 and pin 7 of chip U4, pin 3 of chip U4 is connected to one end of resistor R21 and one end of resistor R19, the other end of resistor R21 is connected to ground, the other end of resistor R19 is connected to pin 1 of resistor R6, pin 4 of chip U4 is connected to negative VCC2.5V power supply, and pin 8 of chip U4 is connected to VCC2.5V power supply.

[0014] Further, the digital module part includes a chip U1, the model of chip U1 is STM32G030C8T64, the 5th pin of chip U1 is connected to one end of resistor R18, the 2nd pin of chip U9, the 1st pin of chip U9 and one end of capacitor C14, the other end of resistor R18 is connected to VCC3V power supply, the other end of capacitor C14 and the 3rd pin of chip U9 are connected to ground, the 6th pin of chip U1 is connected to VCC3V power supply, the 7th pin of chip U1 is connected to ground, the 10th pin of chip U1 is connected to capacitor C5 and one end of resistor R1, the other end of capacitor C5 is connected to VCC3V power supply, the other end of resistor R1 is connected to ground, the 11th pin of chip U1 is connected to VCC3V power supply, the other end of resistor R1 is connected to ground, Connect one end of resistor R2 and one end of resistor R3, the other end of resistor R2 is connected to VCC3V power supply, the other end of resistor R3 is connected to ground, pin 21 of chip U1 is connected to pin 2 of chip U8, pin 22 of chip U1 is connected to pin 12 of chip U8, pin 24 of chip U1 is connected to one end of diode LED2, the other end of diode LED2 is connected to one end of resistor R22, the other end of resistor R22 is connected to VCC3V power supply, pin 29 of chip U1 is connected to pin 10 of chip U8, pin 32 of chip U1 is connected to pin 9 of chip U8, pin 36 of chip U1 is connected to one end of resistor R20, and the other end of resistor R20 is connected to ground.

[0015] Further, the lithium battery charging module includes a chip U7, pin 1 of the chip U7 is connected to one end of the diode LED1, the other end of the diode LED1 is connected to one end of the resistor R29, the other end of the resistor R29 is connected to the VCC power supply, pin 2 of the chip U7 is grounded, pin 3 of the chip U7 is connected to one end of the capacitor C29 and the VBAT power supply, the other end of the capacitor C29 is connected to the ground wire, pin 4 of the chip U7 is connected to one end of the capacitor C28 and the VCC power supply, the other end of the capacitor C28 is connected to the ground wire, and pin 5 of the chip U7 is connected to one end of the resistor R30, and the other end of the resistor R30 is connected to the ground wire.

[0016] The present invention adopts the above technical solution, and has the following technical effects compared with the prior art:

[0017] The measurement system of the invention adopts the test circuit and principle of the AC impedance method. A needle-shaped electrode is inserted into the raw meat, which automatically collects the electrical signal attenuated by the raw meat and converts it into a stable DC signal through buffering, rectification and filtering. After processing and conversion by the digital module, the moisture content in the raw meat can be accurately obtained. The operation is simple, and the current restrictions on the region and personnel requirements for the moisture content of raw meat are eliminated. There are also no strict restrictions on the temperature and pH value of the raw meat, thereby improving the accuracy of detecting the moisture content of raw meat. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale and orientation.

[0019] Figure 1 This is a schematic diagram of the power module circuit in the present invention;

[0020] Figure 2 This is a schematic diagram of the Venn oscillator circuit in the analog module of the present invention;

[0021] Figure 3 It is the principle diagram of the transmitting and precise rectifying circuit in the analog module of the present invention;

[0022] Figure 4 It is the principle diagram of the filter circuit in the analog module of the present invention;

[0023] Figure 5 This is a schematic diagram of the digital module circuit in the present invention;

[0024] Figure 6 This is a circuit schematic diagram of the lithium battery charging module of the present invention. DETAILED DESCRIPTION

[0025] A meat moisture automatic measurement system comprises a power module, a digital module, an analog module and a lithium battery charging module. The power module provides power for the digital module and the analog module. The analog module is used to detect meat moisture and convert the collected meat moisture into different electrical signals. The digital module is connected to the analog module to process and convert the analog electrical signals collected by the analog module. The lithium battery charging module is used to charge the lithium battery power supply in the measurement system.

[0026] like Figure 1 As shown, the power management module includes a 3V power circuit and a 2.5V power circuit.

[0027] The 3V power supply circuit includes a chip U6, the model of the chip U6 is BL9309, the 4th pin of the chip U6 is connected to one end of the capacitor C17 and the VBAT power supply, the other end of the capacitor C17 is connected to the ground line, the 6th pin of the chip U6 is connected to one end of the resistor R25 and one end of the resistor R27, the other end of the resistor R25 is connected to the VCC3V power line, the other end of the resistor R27 is connected to the ground line, the 3rd pin of the chip U6 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to one end of the capacitor C19, one end of the capacitor C20 and the VCC3V power line, the other end of the capacitor C19 and the other end of the capacitor C20 are connected to the ground line, Pin 2 of chip U6 is connected to one end of resistor R33 and the ground wire, the other end of resistor R33 is connected to pin 3 of transistor Q1 and pin 1 of chip U6, pin 2 of transistor Q1 is connected to VBAT power supply and one end of resistor R31, the other end of resistor R31 is connected to pin 1 of transistor Q1, pin 2 of transistor Q2 and one end of diode D7, pin 1 of transistor Q2 is connected to pin 22 of chip U1 and one end of resistor R32, the other end of resistor R32 is connected to the ground wire and pin 3 of transistor Q2, the other end of diode D7 is connected to one end of diode D8, and the other end of diode D8 is connected to pin 23 of chip U1.

[0028] Because it is powered by a battery, a high-efficiency, low-quiescent-current voltage regulator circuit must be used. The designed chip U6 adopts the BL9309 solution from Shanghai Belling. The BL9309 is a high-efficiency, step-down DC switching regulator that can provide an output current of up to 2A and has a wide range of input and output voltages, making the BL9309 an ideal choice for low-voltage power conversion. It can run at a fixed frequency of 1.3MHz, allowing the use of small external components such as ceramic input and output capacitors, and small inductors, while still providing low output ripple. This low-noise output and the excellent efficiency achieved by the internal synchronous rectifier make the BL9309 an ideal green replacement for high-power linear regulators. The internal soft-start control circuit can reduce the inrush current, and the short-circuit and thermal overload protection can improve the design reliability. The quiescent current is only 50uA, which has the outstanding advantages of high efficiency and low power consumption, ensuring the stable output of the power supply.

[0029] The 2.5V power supply circuit includes a chip U5, the model of which is LM27762DSSR. Pins 1, 4 and 13 of the chip U5 are connected to the ground wire, pin 2 of the chip U5 is connected to one end of a resistor R23 and one end of a resistor R24, the other end of the resistor R23 is connected to the VCC2.5V power supply, the other end of the resistor R24 ​​is connected to the ground wire, pin 3 of the chip U5 is connected to the VCC3V power supply and one end of a capacitor C23, the other end of the capacitor C23 is connected to the ground wire, pin 5 of the chip U5 is connected to one end of a capacitor C25, the other end of the capacitor C25 is connected to the ground wire, and the Pin 6 is connected to one end of capacitor C26, and the other end of capacitor C26 is connected to the ground wire. Pin 7 of chip U5 is connected to one end of resistor R26 and one end of resistor R28. The other end of resistor R26 is connected to the negative VCC2.5V power supply, and the other end of resistor R28 is connected to the ground wire. Pin 8 of chip U5 is connected to pin 19 of chip U1. Pin 9 of chip U5 is connected to one end of capacitor C24, and the other end of capacitor C24 is connected to pin 10 of chip U5. Pin 11 of chip U5 is connected to one end of capacitor C22, and the other end of capacitor C22 is connected to the ground wire. Pin 12 of chip U5 is connected to pin 19 of chip U1.

[0030] To generate 2.5V positive and negative power supplies, chip U5R uses the imported Texas Instruments model LM27762DSS chip to generate + / -2.5V voltage from 3V to power the analog circuit. The chip U5's buck converter can not only drive a variety of loads of different sizes, but also ensures efficiency of more than 90%, thus helping to extend the battery life of the system.

[0031] The analog module includes a Wien oscillator circuit, a transmitting and precision rectifying circuit, and a filtering circuit. The Wien oscillator circuit is connected to the transmitting and precision rectifying circuit, and the transmitting and precision rectifying circuit is connected to the filtering circuit.

[0032] like Figure 2 As shown, the Wen oscillation circuit includes a chip U2, the model of the chip U2 is TLV9062, the pin 1 of the chip U2 is connected to one end of a resistor R4, one end of a resistor R7, one end of a diode D4 and one end of a diode D5, the other end of the resistor R7, the other end of the diode D4 and the other end of the diode D5 are connected to one end of a resistor R14, the other end of the resistor R14 is connected to one end of a resistor R15 and pin 2 of the chip U2, the other end of the resistor R15 is grounded, the other end of the resistor R4 is connected to one end of a capacitor C6, the other end of the capacitor C6 is connected to one end of a resistor R8, one end of a capacitor C7 and pin 3 of the chip U2, the other end of the resistor R8 and the other end of the capacitor C7 are connected to the ground wire, the pin 4 of the chip U2 is connected to the negative VCC2.5V power supply, the pin 5 of the chip U2 is connected to one end of a resistor R9, the other end of the resistor R9 is connected to the ground wire, and the pin 8 of the chip U2 is connected to the VCC2.5V power supply.

[0033] The Wien oscillation circuit generates a 165KHz sine wave through an external signal line input and inputs it into the raw meat through a needle-shaped transmitting electrode. The needle-shaped receiving electrode receives the electrical signal attenuated by the raw meat and buffers, rectifies, and filters it into direct current. Nonlinear devices diode D4 and diode D5 are introduced into the negative feedback arm of the Wien bridge oscillation circuit to stabilize the amplitude of the sine wave. Resistor R4, resistor R8, capacitor C6 and capacitor C7 together constitute a frequency selection circuit, which is used for positive feedback of the circuit to form a stable frequency oscillation.

[0034] like Figure 3 As shown, the transmitting and precision rectification circuit includes a chip U3, the model of chip U3 is RS8752XM, pin 1 of chip U3 is connected to one end of diode D3 and one end of diode D1, the other end of diode D3 is connected to pin 2 of resistor R5, one end of resistor R10 and pin 2 of chip U3, the other end of diode D1 is connected to pin 1 of resistor R5, the other end of resistor R10 is connected to pin 6 and pin 7 of chip U2, pin 3 and pin 5 of chip U3 are connected to ground, pin 4 of chip U3 is connected to negative VCC2.5V power supply, pin 6 of chip U3 is connected to one end of resistor R13, pin 2 of resistor R6 and one end of diode D6, the other end of resistor R13 is connected to pin 1 of chip U2, pin 1 of resistor R6 is connected to one end of diode D2, the other end of diode D2 and the other end of diode D6 are connected to pin 7 of chip U3, and pin 8 of chip U3 is connected to VCC2.5V power supply.

[0035] like Figure 4 As shown, the filtering circuit includes a chip U4, the model of the chip U4 is TLV9062, the pin 1 of the chip U4 is connected to one end of the resistor R11 and one end of the resistor R17, the other end of the resistor R11 is connected to one end of the capacitor C12 and one end of the resistor R12, the other end of the capacitor C12 is connected to the ground line, the other end of the resistor R12 is connected to the pin 12 of the chip U1 and one end of the capacitor C13, the other end of the capacitor C13 is connected to the ground line, the other end of the resistor R17 is connected to the pin 2 of the chip U4 and one end of the resistor R16, the other end of the resistor R16 is connected to the pin 6 and pin 7 of the chip U4, the pin 3 of the chip U4 is connected to one end of the resistor R21 and one end of the resistor R19, the other end of the resistor R21 is connected to the ground line, the other end of the resistor R19 is connected to the pin 1 of the resistor R6, the pin 4 of the chip U4 is connected to the negative VCC2.5V power supply, and the pin 8 of the chip U4 is connected to the VCC2.5V power supply.

[0036] After precise rectification and subtraction, the input sine wave and the output sine wave enter the low-pass filter and become a stable DC, which is then collected by chip U1. The DC voltage is negatively correlated with the moisture content of the meat and is a monotonic relationship. After being sorted and processed by the filter circuit, the output of the Wen's oscillator circuit starts oscillating quickly and has a stable waveform. Although it is a bipolar signal, the average value is positive. After low-pass filtering, it becomes a stable positive voltage signal.

[0037] like Figure 5 As shown, the digital module part includes a chip U1, the model of the chip U1 is STM32G030C8T64, the 5th pin of the chip U1 is connected to one end of the resistor R18, the 2nd pin of the chip U9, the 1st pin of the chip U9 and one end of the capacitor C14, the other end of the resistor R18 is connected to the VCC3V power supply, the other end of the capacitor C14 and the 3rd pin of the chip U9 are connected to the ground wire, the 6th pin of the chip U1 is connected to the VCC3V power supply, the 7th pin of the chip U1 is connected to the ground wire, the 10th pin of the chip U1 is connected to the capacitor C5 and one end of the resistor R1, the other end of the capacitor C5 is connected to the VCC3V power supply, the other end of the resistor R1 is connected to the ground wire, the 11th pin of the chip U1 is connected to the VCC3V power supply, the other end of the resistor R1 is connected to the ground wire, and the 12th pin of the chip U1 is connected to the VCC3V power supply. Connect one end of resistor R2 and one end of resistor R3, the other end of resistor R2 is connected to VCC3V power supply, the other end of resistor R3 is connected to ground, pin 21 of chip U1 is connected to pin 2 of chip U8, pin 22 of chip U1 is connected to pin 12 of chip U8, pin 24 of chip U1 is connected to one end of diode LED2, the other end of diode LED2 is connected to one end of resistor R22, the other end of resistor R22 is connected to VCC3V power supply, pin 29 of chip U1 is connected to pin 10 of chip U8, pin 32 of chip U1 is connected to pin 9 of chip U8, pin 36 of chip U1 is connected to one end of resistor R20, and the other end of resistor R20 is connected to ground.

[0038] Chip U1 is a high-performance, low-cost, low-power chip. Compared with traditional single-chip microcomputers, it has fast speed, modular program, simple interface and stable working performance, and can better match the measurement system circuit.

[0039] like Figure 6 As shown, the lithium battery charging module includes a chip U7, pin 1 of the chip U7 is connected to one end of the diode LED1, the other end of the diode LED1 is connected to one end of the resistor R29, the other end of the resistor R29 is connected to the VCC power supply, pin 2 of the chip U7 is grounded, pin 3 of the chip U7 is connected to one end of the capacitor C29 and the VBAT power supply, the other end of the capacitor C29 is connected to the ground wire, pin 4 of the chip U7 is connected to one end of the capacitor C28 and the VCC power supply, the other end of the capacitor C28 is connected to the ground wire, and pin 5 of the chip U7 is connected to one end of the resistor R30, and the other end of the resistor R30 is connected to the ground wire.

[0040] The description of the present invention is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the invention to the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the invention and to enable those of ordinary skill in the art to understand the invention and design various embodiments with various modifications suitable for specific uses.

Claims

1. An automatic measurement system for the moisture content of meat, characterized in that: It includes a power module, a digital module, an analog module and a lithium battery charging module. The power module provides power for the digital module and the analog module. The analog module is used to detect the moisture content of meat and convert the collected moisture content of meat into different electrical signals. The power module includes a 3V power supply circuit and a 2.5V power supply circuit. The analog module includes a Wen's oscillation circuit, a transmitting and precision rectification circuit, and a filtering circuit. The Wen's oscillation circuit is connected to the transmitting and precision rectification circuit, and the transmitting and precision rectification circuit is connected to the filtering circuit. The digital module is connected to the filter circuit in the analog module to process and transform the analog electrical signal collected by the analog module. The lithium battery charging module is used to charge the lithium battery power supply in the detector. The Wen oscillator circuit includes a chip U2, the model of the chip U2 is TLV9062, the pin 1 of the chip U2 is connected to one end of a resistor R4, one end of a resistor R7, one end of a diode D4 and one end of a diode D5, the other end of the resistor R7, the other end of the diode D4 and the other end of the diode D5 are connected to one end of a resistor R14, the other end of the resistor R14 is connected to one end of a resistor R15 and the pin 2 of the chip U2, the other end of the resistor R15 is grounded, the other end of the resistor R4 is connected to one end of a capacitor C6, the other end of the capacitor C6 is connected to one end of a resistor R8, one end of a capacitor C7 and the pin 3 of the chip U2, the other end of the resistor R8 and the other end of the capacitor C7 are connected to the ground wire, the pin 4 of the chip U2 is connected to the negative VCC2.5V power supply, the pin 5 of the chip U2 is connected to one end of a resistor R9, the other end of the resistor R9 is connected to the ground wire, and the pin 8 of the chip U2 is connected to the VCC2.5V power supply; The transmitting and precision rectifying circuit includes a chip U3, the model of the chip U3 is RS8752XM, the pin 1 of the chip U3 is connected to one end of the diode D3 and one end of the diode D1, the other end of the diode D3 is connected to the 2nd pin of the resistor R5, one end of the resistor R10 and the 2nd pin of the chip U3, the other end of the diode D1 is connected to the 1st pin of the resistor R5, the other end of the resistor R10 is connected to the 6th pin and the 7th pin of the chip U2, the 3rd pin and the 5th pin of the chip U3 are connected to the ground line, the 4th pin of the chip U3 is connected to the negative VCC2.5V power supply, the 6th pin of the chip U3 is connected to one end of the resistor R13, the 2nd pin of the resistor R6 and one end of the diode D6, the other end of the resistor R13 is connected to the 1st pin of the chip U2, the 1st pin of the resistor R6 is connected to one end of the diode D2, the other end of the diode D2 and the other end of the diode D6 are connected to the 7th pin of the chip U3, and the 8th pin of the chip U3 is connected to the VCC2.5V power supply; The filtering circuit includes a chip U4, the model of which is TLV9062. Pin 1 of chip U4 is connected to one end of resistor R11 and one end of resistor R17, the other end of resistor R11 is connected to one end of capacitor C12 and one end of resistor R12, the other end of capacitor C12 is connected to the ground wire, the other end of resistor R12 is connected to pin 12 of chip U1 and one end of capacitor C13, the other end of capacitor C13 is connected to the ground wire, the other end of resistor R17 is connected to pin 2 of chip U4 and one end of resistor R16, the other end of resistor R16 is connected to pin 6 and pin 7 of chip U4, pin 3 of chip U4 is connected to one end of resistor R21 and one end of resistor R19, the other end of resistor R21 is connected to the ground wire, the other end of resistor R19 is connected to pin 1 of resistor R6, pin 4 of chip U4 is connected to the negative VCC2.5V power supply, and pin 8 of chip U4 is connected to the VCC2.5V power supply.

2. The automatic measurement system for moisture content of meat according to claim 1, characterized in that: The 3V power supply circuit includes a chip U6, the model of the chip U6 is BL9309, the 4th pin of the chip U6 is connected to one end of the capacitor C17 and the VBAT power supply, the other end of the capacitor C17 is connected to the ground line, the 6th pin of the chip U6 is connected to one end of the resistor R25 and one end of the resistor R27, the other end of the resistor R25 is connected to the VCC3V power line, the other end of the resistor R27 is connected to the ground line, the 3rd pin of the chip U6 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to one end of the capacitor C19, one end of the capacitor C20 and the VCC3V power line, the other end of the capacitor C19 and the other end of the capacitor C20 are connected to the ground line, Pin 2 of chip U6 is connected to one end of resistor R33 and the ground wire, the other end of resistor R33 is connected to pin 3 of transistor Q1 and pin 1 of chip U6, pin 2 of transistor Q1 is connected to VBAT power supply and one end of resistor R31, the other end of resistor R31 is connected to pin 1 of transistor Q1, pin 2 of transistor Q2 and one end of diode D7, pin 1 of transistor Q2 is connected to pin 22 of chip U1 and one end of resistor R32, the other end of resistor R32 is connected to the ground wire and pin 3 of transistor Q2, the other end of diode D7 is connected to one end of diode D8, and the other end of diode D8 is connected to pin 23 of chip U1.

3. The automatic measurement system for moisture content of meat according to claim 1, characterized in that: The 2.5V power supply circuit includes a chip U5, the model of which is LM27762DSSR. Pins 1, 4 and 13 of the chip U5 are connected to the ground wire, pin 2 of the chip U5 is connected to one end of a resistor R23 and one end of a resistor R24, the other end of the resistor R23 is connected to the VCC2.5V power supply, the other end of the resistor R24 ​​is connected to the ground wire, pin 3 of the chip U5 is connected to the VCC3V power supply and one end of a capacitor C23, the other end of the capacitor C23 is connected to the ground wire, pin 5 of the chip U5 is connected to one end of a capacitor C25, the other end of the capacitor C25 is connected to the ground wire, and the Pin 6 is connected to one end of capacitor C26, and the other end of capacitor C26 is connected to the ground wire. Pin 7 of chip U5 is connected to one end of resistor R26 and one end of resistor R28. The other end of resistor R26 is connected to the negative VCC2.5V power supply, and the other end of resistor R28 is connected to the ground wire. Pin 8 of chip U5 is connected to pin 19 of chip U1. Pin 9 of chip U5 is connected to one end of capacitor C24, and the other end of capacitor C24 is connected to pin 10 of chip U5. Pin 11 of chip U5 is connected to one end of capacitor C22, and the other end of capacitor C22 is connected to the ground wire. Pin 12 of chip U5 is connected to pin 19 of chip U1.

4. The automatic measurement system for moisture content of meat according to claim 1, characterized in that: The digital module part includes a chip U1, the model of the chip U1 is STM32G030C8T64, the 5th pin of the chip U1 is connected to one end of the resistor R18, the 2nd pin of the chip U9, the 1st pin of the chip U9 and one end of the capacitor C14, the other end of the resistor R18 is connected to the VCC3V power supply, the other end of the capacitor C14 and the 3rd pin of the chip U9 are connected to the ground wire, the 6th pin of the chip U1 is connected to the VCC3V power supply, the 7th pin of the chip U1 is connected to the ground wire, the 10th pin of the chip U1 is connected to the capacitor C5 and one end of the resistor R1, the other end of the capacitor C5 is connected to the VCC3V power supply, the other end of the resistor R1 is connected to the ground wire, and the 11th pin of the chip U1 is connected One end of resistor R2 and one end of resistor R3, the other end of resistor R2 is connected to VCC3V power supply, the other end of resistor R3 is connected to ground, pin 21 of chip U1 is connected to pin 2 of chip U8, pin 22 of chip U1 is connected to pin 12 of chip U8, pin 24 of chip U1 is connected to one end of diode LED2, the other end of diode LED2 is connected to one end of resistor R22, the other end of resistor R22 is connected to VCC3V power supply, pin 29 of chip U1 is connected to pin 10 of chip U8, pin 32 of chip U1 is connected to pin 9 of chip U8, pin 36 of chip U1 is connected to one end of resistor R20, and the other end of resistor R20 is connected to ground.

5. The automatic measurement system for moisture content of meat according to claim 1, characterized in that: The lithium battery charging module includes a chip U7, wherein pin 1 of the chip U7 is connected to one end of a diode LED1, the other end of the diode LED1 is connected to one end of a resistor R29, the other end of the resistor R29 is connected to a VCC power supply, pin 2 of the chip U7 is grounded, pin 3 of the chip U7 is connected to one end of a capacitor C29 and a VBAT power supply, the other end of the capacitor C29 is connected to a ground wire, pin 4 of the chip U7 is connected to one end of a capacitor C28 and a VCC power supply, the other end of the capacitor C28 is connected to a ground wire, and pin 5 of the chip U7 is connected to one end of a resistor R30, the other end of the resistor R30 is connected to a ground wire.

Images