Analog quantity acquisition circuit board

Abstract

The embodiment of the utility model discloses an analog quantity acquisition circuit board. The analog quantity acquisition circuit board comprises a main control module, an analog quantity acquisition module, a communication module and a storage module; the analog quantity acquisition module is connected with the main control module, the analog quantity acquisition module is used for transmitting an acquired analog quantity signal to the main control module, and the analog quantity signal comprises at least one of resistance, current and voltage; the main control module is connected with the storage module and the communication module, the main control module is used for converting the analog quantity signal into a digital signal and transmitting the digital signal to the storage module and the communication module, the storage module is used for storing the digital signal, and the communication module is used for communication between the main control module and an external analog quantity acquisition circuit board. According to the utility model, the analog quantity acquisition efficiency can be improved, large-scale analog quantity acquisition can be carried out, and a large amount of acquired analog quantity data can be recorded and stored.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of circuit board assembly manufacturing, and in particular to an analog quantity acquisition circuit board. Background Art

[0002] The existing analog quantity acquisition circuit board has the problems of low acquisition efficiency, small number of analog quantity acquisition, not particularly large range of analog quantity acquisition, and small content of acquired data storage. Utility Model Content

[0003] The utility model provides an analog quantity acquisition circuit board, which can improve the efficiency of analog quantity acquisition, carry out analog quantity acquisition in a wide range, and record and store a large amount of collected analog quantity data.

[0004] According to one aspect of the utility model, an analog quantity acquisition circuit board is provided, and the analog quantity acquisition circuit board includes: a main control module, an analog quantity acquisition module, a communication module and a storage module;

[0005] The analog quantity acquisition module is connected to the main control module, and the analog quantity acquisition module is used to transmit the collected analog quantity signal to the main control module, and the analog quantity signal includes at least one of resistance, current and voltage;

[0006] The main control module is connected to the storage module and the communication module, and is used to convert the analog signal into a digital signal and transmit it to the storage module and the communication module.

[0007] The storage module is used to store the digital signal, and the communication module is used for the main control module to communicate with an external analog quantity acquisition circuit board.

[0008] Optionally, the analog quantity acquisition circuit board further includes a power supply module and a switch module;

[0009] The switch module is connected to the main control module, the power supply module is connected to the main control module, and the power supply module is used to provide power to the main control module.

[0010] Optionally, the analog quantity acquisition circuit board further includes a first voltage conversion module, a second voltage conversion module, a third voltage conversion module and a fourth voltage conversion module; the first voltage conversion module is connected to the power supply module, and the first voltage conversion module is used to convert the voltage output by the power supply module into a first preset voltage;

[0011] The second voltage conversion module is connected to the first voltage conversion module, and the second voltage conversion module is used to convert the first preset voltage into a second preset voltage;

[0012] The third voltage conversion module is connected to the first voltage conversion module, and the third voltage conversion module is used to convert the first preset voltage into a third preset voltage;

[0013] The fourth voltage conversion module is connected to the third voltage conversion module, and the fourth voltage conversion module is used to convert the third preset voltage into a fourth preset voltage.

[0014] Optionally, the first preset voltage is greater than the third preset voltage, the third preset voltage is greater than the fourth preset voltage, and the fourth preset voltage is greater than the second preset voltage.

[0015] Optionally, the analog quantity acquisition module includes: an analog multiplexer, a third capacitor, a first amplifier, an eighth resistor, a twelfth resistor, a fourteenth resistor, a third resistor, a sixteenth resistor, a thirteenth resistor, a fifteenth resistor, a second amplifier, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, an analog-to-digital converter, a nineteenth resistor, a first crystal oscillator, an eighteenth capacitor, a voltage regulator, a zeroth capacitor, an inductor, and a thirty-third capacitor;

[0016] The eighth end of the analog multiplexer is connected to the first end of the third capacitor and the third end of the first amplifier, the second end of the third capacitor is grounded, the sixth end of the first amplifier is connected to the first end of the eighth resistor, the second end of the eighth resistor is connected to the third end of the second amplifier and the first end of the twelfth resistor, the second end of the twelfth resistor is connected to the first power supply end, the first end of the second amplifier is connected to the fourteenth resistor, the third resistor, the sixteenth resistor and the eighth end of the second amplifier, the second end of the second amplifier is connected to the first end of the thirteenth resistor and the first end of the fifteenth resistor, the second end of the thirteenth resistor is grounded, and the second end of the fifteenth resistor is connected to the The sixth end, the first end of the fifteenth capacitor, the first end of the sixteenth capacitor and the first end of the analog-to-digital converter are connected, the second end of the analog-to-digital converter is connected to the first power supply end, the nineteenth resistor is connected between the fourth end of the analog-to-digital converter and the third end of the first crystal oscillator, the first end of the eighteenth capacitor is connected to the third end of the analog-to-digital converter, the second end of the eighteenth capacitor is grounded, the fourth end of the analog-to-digital converter is connected to the first end of the inductor and the first end of the thirty-third capacitor, the second end of the inductor is connected to the first end of the regulator, the second end of the regulator is connected to the second end of the thirty-third capacitor and the second end of the zeroth capacitor and then grounded, and the first end of the zeroth capacitor is connected to the third end of the regulator.

[0017] Optionally, the storage module includes: a twenty-ninth resistor, a twenty-first resistor, a fourth transistor, a fifth diode, a thirty-first resistor, a one hundred and seventh resistor, an eighty-fifth capacitor, a thirty-second resistor and an SD card holder;

[0018] The first end of the 29th resistor is connected to the power supply end, the second end of the 29th resistor is connected to the first end of the 21st resistor and the base of the fourth transistor, the collector of the fourth transistor is connected to the second end of the 21st resistor and the first end of the 107th resistor, the second end of the 107th resistor is connected to the tenth end of the SD card socket, the emitter of the fourth transistor is connected to the anode of the fifth diode, the first end of the 85th capacitor and the fourth end of the SD card socket, the second end of the 85th capacitor is connected to the third end of the SD card socket, the cathode of the fifth diode is connected to the first end of the 31st resistor, the second end of the 31st resistor is grounded, the first end of the SD card socket is connected to the first end of the 32nd resistor, and the 32nd resistor is connected to the sixth power supply end.

[0019] Optionally, the first voltage conversion module includes: a first capacitor, a first power chip, a third diode, a second inductor, a seventh capacitor and a first fuse;

[0020] The second voltage conversion module includes: a sixth capacitor, a second power chip, an eleventh capacitor and a second fuse;

[0021] The first end of the first capacitor is connected to the power supply module and the first end of the first power chip, the second end of the first capacitor is grounded, the third end and the fifth end of the first power chip are connected and then grounded, the second end of the first power chip is connected to the cathode of the third diode and the first end of the second inductor, the second end of the second inductor is connected to the fourth end of the first power chip, the first end of the first fuse and the first end of the seventh capacitor, the second end of the seventh capacitor is connected to the anode of the third diode and then grounded, and the second end of the first fuse is connected to the second voltage conversion module;

[0022] The first end of the sixth capacitor is connected to the second end of the first fuse and the first end of the second power chip, the second end of the sixth capacitor is connected to the third end of the second power chip and the second end of the eleventh capacitor and then grounded, and the first end of the eleventh capacitor is connected to the second end of the second power chip and the second fuse.

[0023] Optionally, the third voltage conversion module includes: a fifth capacitor, a third power chip, a one hundred and second diode, an eleventh inductor and a one hundred and second capacitor;

[0024] The first end of the fifth capacitor is connected to the first voltage conversion module and the first end of the third power supply chip, the second end of the fifth capacitor is connected to the third end, the fifth end, the anode of the first one hundred and second diode, and the first end of the first one hundred and second capacitor of the third power supply chip and then grounded, the first end of the eleventh inductor is connected to the second end of the third power supply chip and the cathode of the first one hundred and second diode, and the second end of the eleventh inductor is connected to the fourth end of the third power supply chip, the second end of the first one hundred and second capacitor, and the fourth voltage conversion module.

[0025] Optionally, the fourth voltage conversion module includes: a seventh capacitor, a fourth power chip, an eighth capacitor, a fiftieth capacitor and a ninth resistor;

[0026] The first end of the seventh capacitor is connected to the first one hundred and second capacitor and the third end of the fourth power chip, the second end of the seventh capacitor is connected to the first end of the ninth resistor and then grounded, the second end of the ninth resistor is grounded, the fourth end of the fourth power chip is connected to the second end, the first end of the eighth capacitor and the first end of the fiftieth capacitor, the first end of the fourth power chip is connected to the second end of the eighth capacitor and the second end of the fiftieth capacitor.

[0027] Optionally, the main control module includes an LPC1786 microcontroller.

[0028] The technical solution of the embodiment of the utility model is to collect analog signals through the analog quantity acquisition module, and the main control module converts the analog signals into digital signals and transmits them to the storage module and the communication module. The storage module stores the digital signals, and the communication module is used for the main control module to communicate with the external analog quantity acquisition circuit board. By increasing the voltage range to increase the analog quantity acquisition range, the efficiency of analog quantity acquisition can be improved, a large range of analog quantity acquisition can be performed, and a large amount of collected analog quantity data can be recorded and stored. In summary, the utility model solves the problems of low acquisition efficiency, small number of analog quantity acquisition, not particularly large range of analog quantity acquisition, and small amount of content stored in the existing analog quantity acquisition circuit board. It should be understood that the content described in this section is not intended to identify the key or important features of the embodiment of the utility model, nor is it used to limit the scope of the utility model. Other features of the utility model will become easy to understand through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 It is a structural schematic diagram of an analog quantity acquisition circuit board provided according to an embodiment of the utility model;

[0031] Figure 2 It is a structural schematic diagram of another analog quantity acquisition circuit board provided according to an embodiment of the utility model;

[0032] Figure 3 It is a work flow chart of an analog quantity acquisition circuit board provided according to an embodiment of the utility model;

[0033] Figure 4 It is a circuit principle diagram of an analog quantity acquisition module provided according to an embodiment of the utility model;

[0034] Figure 5 It is a circuit schematic diagram of a storage module provided according to an embodiment of the utility model;

[0035] Figure 6 It is a circuit schematic diagram of a voltage conversion module provided according to an embodiment of the utility model;

[0036] Figure 7 The present invention is a wiring diagram of an analog quantity acquisition circuit board provided in accordance with an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] Figure 1 This is a schematic diagram of the structure of an analog quantity acquisition circuit board provided according to an embodiment of the utility model, referring to Figure 1 The embodiment of the utility model provides an analog quantity acquisition circuit board, which includes: a main control module 10, an analog quantity acquisition module 20, a communication module 30 and a storage module 40; the analog quantity acquisition module 20 is connected to the main control module 10, and the analog quantity acquisition module 20 is used to transmit the collected analog quantity signal to the main control module 10, and the analog quantity signal includes at least one of resistance, current and voltage; the main control module 10 is connected to the storage module 40 and the communication module 30, and the main control module 10 is used to convert the analog quantity signal into a digital signal and transmit it to the storage module 40 and the communication module 30, the storage module 40 is used to store the digital signal, and the communication module 30 is used for the main control module 10 to communicate with the external analog quantity acquisition circuit board.

[0040] Optionally, the main control module 10 includes an LPC1786 microcontroller.

[0041] Specifically, analog data acquisition is an indispensable link between the analog domain and the digital domain, and its existence plays a very important role. The focus of the hardware part of the analog acquisition circuit board is the main control module 10. The data acquisition and communication control adopt a modular design. The data acquisition and communication control are implemented by the LPC1786 microcontroller. The main control module 10 of the hardware part is based on the LPC1786 microcontroller.

[0042] The analog quantity acquisition circuit board can collect multiple analog quantities of three-wire resistance, current, and voltage. The main control module 10 uses the LPC1786 microcontroller. The LPC1768 is an ARM Cortex-M3 microcontroller with embedded high-speed Flash memory launched by NXP. It has the advantages of high performance, small size, low power consumption, and multiple peripherals that can be selected on the chip. It has a wide range of applications. The LPC1768 includes peripherals such as pulse width modulator, orthogonal encoder interface, and 4 general 32-bit timers. The pulse width modulator can output PWM signals and can be used for various industrial controls. The analog quantity acquisition module 20 is composed of the DG508A chip and the ADS1252U chip. The analog quantity acquisition module 20 has a wide dynamic range, low power consumption, and characteristics specific to energy measurement. It is very suitable for energy metering, power metering, and circuit breaker applications. The communication module 30 uses the ADM2483 integrated current isolation device. The ADM2483 differential bus transceiver is an integrated current isolation device suitable for bidirectional data communication of multi-point bus transmission lines. It is designed for balanced transmission lines and complies with ANSI TIA / EIA RS-485-A and ISO 8482:1987(E) standards. The device uses ADI's iCoupler technology to integrate a 3-channel isolator, a three-state differential line driver, and a differential input receiver in a single package. The storage module 40 can be an SD card slot to facilitate the sorting and transfer of the collected analog data.

[0043] The ADC interface of the microcontroller is an analog-to-digital conversion interface. The ADC interface is used to convert external analog signals into digital signals. The microcontroller is a digital device, and the analog signal needs to be converted into a digital signal before it can be processed by the microcontroller. At present, many microcontrollers on the market have built-in ADC conversion interfaces. If there is no ADC conversion interface, an ADC digital-to-analog conversion chip can be used for external expansion.

[0044] The ADC interface converts analog signals into digital signals. Digital signals are represented by 0 and 1. The ADC interface has a reference voltage. Assuming the reference voltage is 5V, the ADC is 12 bits (how many bits are used to store the digital quantity after the analog quantity is converted). The 12-bit ADC interface can store digital quantities in the range of (binary) 000000000000-111111111111, which is converted to decimal numbers in the range of 0-2 12 That is, 0-4095. In other words, the reference voltage is divided into 2 12 That is, 4096 copies, and the minimum resolution is VREF / 4096. That is to say, the binary 000000000000 represents the input analog value 0V, and 111111111111 represents the maximum value VREF.

[0045] The main control module 10 uses the LPC1786 microcontroller as the main chip. The working power supply of the microcontroller is 3.3V, and the reference voltage is 2.048V, so the input range of the analog quantity is 0-2.048V. If the voltage range to be collected is greater than the reference voltage value, a resistor divider can be used to reduce the voltage or an op amp can be used to reduce it. The ADC interface of the microcontroller is 12 bits. That is to say, when the input voltage is 0, the digital quantity result after the microcontroller conversion is 000000000000 (binary), and when the input voltage is 2.048V, the digital quantity result after the microcontroller conversion is 111111111111 (binary), which is 4095 in decimal. In other words, the value of the input voltage V = 2.048 × the digital quantity collected by ADC ÷ 4095. If you want to collect an analog voltage in the range of 0-10V for display, you can first reduce the 0-10V voltage by 5 times, you can use resistor voltage division, or you can use op amp reduction, and then connect it to the ADC interface of the microcontroller. The final conversion formula is: V = result * 2.048 / 4095 * 5; where result is the digital value collected by the microcontroller.

[0046] The technical solution of the embodiment of the utility model is to collect analog signals through the analog quantity acquisition module, and the main control module converts the analog signals into digital signals and transmits them to the storage module and the communication module. The storage module stores the digital signals, and the communication module is used for the main control module to communicate with the external analog quantity acquisition circuit board. By increasing the voltage range to increase the analog quantity acquisition range, the efficiency of analog quantity acquisition can be improved, a large range of analog quantity acquisition can be performed, and a large amount of collected analog quantity data can be recorded and stored. In summary, the utility model solves the problems of low acquisition efficiency, small number of analog quantity acquisition, not particularly large range of analog quantity acquisition, and small content of collected data storage in the existing analog quantity acquisition circuit board.

[0047] Figure 2 This is a schematic diagram of the structure of another analog quantity acquisition circuit board provided according to an embodiment of the utility model, referring to Figure 2 Optionally, the analog quantity acquisition circuit board also includes a power supply module 50 and a switch module 60; the switch module 60 is connected to the main control module 10, and the power supply module 50 is connected to the main control module 10, and the power supply module 50 is used to provide power to the main control module 10.

[0048] Specifically, the power supply module 50 provides a 24V power supply voltage, which can be converted into a voltage of +12V to -12V through a voltage conversion circuit, and connected to the analog quantity acquisition module 20 through a sub-board, thereby realizing analog quantity acquisition within the range of +12V to -12V. The analog quantity acquisition range is increased by increasing the voltage range.

[0049] The switch module 60 may be an eight-bit single-pole single-throw DIP switch, which can simulate up to 256 addresses by setting binary conversion.

[0050] Continue to refer Figure 2 Optionally, the analog quantity acquisition circuit board also includes a first voltage conversion module 70, a second voltage conversion module 80, a third voltage conversion module 90 and a fourth voltage conversion module 100; the first voltage conversion module 70 is connected to the power supply module 50, and the first voltage conversion module 70 is used to convert the voltage output by the power supply module 50 into a first preset voltage; the second voltage conversion module 80 is connected to the first voltage conversion module 70, and the second voltage conversion module 80 is used to convert the first preset voltage into a second preset voltage; the third voltage conversion module 90 is connected to the first voltage conversion module 70, and the third voltage conversion module 90 is used to convert the first preset voltage into a third preset voltage; the fourth voltage conversion module 100 is connected to the third voltage conversion module 90, and the fourth voltage conversion module 100 is used to convert the third preset voltage into a fourth preset voltage.

[0051] Optionally, the first preset voltage is greater than the third preset voltage, the third preset voltage is greater than the fourth preset voltage, and the fourth preset voltage is greater than the second preset voltage.

[0052] Specifically, the first preset voltage may be 12V, the second preset voltage may be -12V, the third preset voltage may be 5V, and the fourth preset voltage may be 3.3V.

[0053] The first voltage conversion module 70 may be a LM2596S-12 chip, the second voltage conversion module 80 may be a K7805-500R3 chip, the third voltage conversion module 90 may be a LM2576SX-5 chip, and the fourth voltage conversion module 100 may be a low voltage drop linear regulator AMS1117-3.3.

[0054] The power supply of the analog quantity acquisition circuit board is 24V, and the voltage conversion between 12V and 5V is performed through the LM2596S-12 chip and the LM2576SX-5 chip. The voltage conversion from +12V to -12V is then performed through the K7805-500R3 chip. As for the voltage conversion of 3.3V, the low voltage drop linear regulator AMS1117-3.3 (which can adapt to a wider range of power supply voltages) is used. AMS1117 is a low dropout voltage regulator. Its voltage regulator adjustment tube is composed of a PNP-driven NPN tube. The dropout voltage is defined as: VDROP = VBE + VSAT. AMS1117 has two versions available, fixed and adjustable. The output voltage can be: 1.2V, 1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V, and 5.0V. The on-chip overheat cutoff circuit provides overload and overheat protection to prevent the ambient temperature from causing excessive junction temperature. To ensure the stability of the AMS1117, for the adjustable voltage version, the output needs to be connected to a tantalum capacitor of at least 22uF. For the fixed voltage version, a smaller capacitor can be used, which can be determined according to the actual application. Generally, the stability of the regulator decreases as the output current increases.

[0055] Figure 3 This is a workflow diagram of an analog quantity acquisition circuit board provided according to an embodiment of the utility model, referring to Figure 3 , Figure 3 The entire working process of the analog quantity acquisition circuit board is shown exemplarily.

[0056] Figure 4 This is a circuit diagram of an analog quantity acquisition module provided according to an embodiment of the utility model, referring to Figure 4Optionally, the analog quantity acquisition module includes: an analog multiplexer U3, a third capacitor C3, a first amplifier U6, an eighth resistor R8, a twelfth resistor R12, a fourteenth resistor R14, a third resistor R3, a sixteenth resistor R16, a thirteenth resistor R13, a fifteenth resistor R15, a second amplifier U8, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, an analog-to-digital converter U9, a nineteenth resistor R19, a first crystal oscillator X1, an eighteenth capacitor C18, a voltage regulator U1, a zero capacitor E0, an inductor L1 and a third three capacitors E3; the eighth terminal 8 of the analog multiplexer U3 is connected to the first terminal of the third capacitor C3 and the third terminal 3 of the first amplifier U6, the second terminal of the third capacitor C3 is grounded, the sixth terminal 6 of the first amplifier U6 is connected to the first terminal of the eighth resistor R8, the second terminal of the eighth resistor R8 is connected to the third terminal 3 of the second amplifier U8 and the first terminal of the twelfth resistor R12, the second terminal of the twelfth resistor R12 is connected to the first power supply terminal +VR2.5V, the first terminal 1 of the second amplifier U8 is connected to the fourteenth resistor R14, the third resistor R3, the sixteenth resistor R14 R16 is connected to the eighth end 8 of the second amplifier U8, the second end 2 of the second amplifier U8 is connected to the first end of the thirteenth resistor R13 and the first end of the fifteenth resistor R15, the second end of the thirteenth resistor R13 is grounded, the second end of the fifteenth resistor R15 is connected to the sixth end 6 of the second amplifier U8, the first end of the fifteenth capacitor C15, the first end of the sixteenth capacitor C16 and the first end 1 of the analog-to-digital converter U9, the second end 2 of the analog-to-digital converter U9 is connected to the first power supply end +VR2.5V, and the nineteenth resistor R19 is connected to the analog-to-digital converter Between the fourth end 4 of the analog-to-digital converter U9 and the third end 3 of the first crystal oscillator X1, the first end of the eighteenth capacitor C18 is connected to the third end 3 of the analog-to-digital converter U9, the second end of the eighteenth capacitor C18 is grounded, the fourth end 4 of the analog-to-digital converter U9 is connected to the first end of the inductor L1 and the first end of the third capacitor E3, the second end of the inductor L1 is connected to the first end 1 of the voltage regulator U1, the second end 2 of the voltage regulator U1 is connected to the second end of the third capacitor E3 and the second end of the zeroth capacitor E0 and then grounded, and the first end of the zeroth capacitor E0 is connected to the third end 3 of the voltage regulator U1.

[0057] Specifically, the analog multiplexer can be a DG508A chip, and the analog-to-digital converter can be an ADS1252U chip. The analog quantity is collected based on the analog-to-digital conversion acquisition part composed of the DG508A chip and the ADS1252U chip. The ADS1252U chip is a dual-channel, simultaneous sampling, 24-bit analog-to-digital converter (ADC) with wide dynamic range, low power consumption and energy measurement-specific characteristics, which is very suitable for energy metering, power metering and circuit breaker applications. The ADC input can be directly connected to a resistor divider network or a power transformer to measure voltage or to an AO4441 current transformer, shunt or Rogowski coil to measure current. Each ADC channel can be independently configured according to the sensor input. The low-noise, programmable gain amplifier provides a gain of 1 to 128 to amplify low-level signals. In addition, the device integrates inter-channel phase calibration and offset and gain calibration registers to help eliminate signal chain errors. The low-drift 1.2V reference is integrated into the device to reduce the area of ​​the printed circuit board. Optional cyclic redundancy check (CRC) on data input, data output, and register map to maintain communication integrity. The complete analog front end (AFE) is available in a 20-pin TSSOP package or a leadless 20-pin WQFN package and is specified over the –40°C to +125°C temperature range. Features: 2 simultaneous sampling differential inputs; programmable data rate up to 64kSPS; programmable gain up to 128.

[0058] The DG508A chip is a single 8-channel / differential 4-channel CMOS analog multiplexer. The ADG508A can switch 1 of the 8 inputs to a common output, depending on the state of three binary addresses and an enable input. The ADG509A switches one of the four differential inputs to a common differential output, depending on the state of two binary addresses and an enable input. Both devices have TTL and 5V CMOS logic compatible digital inputs. The ADG508A and ADG509A are based on an enhanced LC2MOS process that improves the signal capability of VSS to VDD and can operate over a wide power supply voltage range. The device can operate in a single or dual power supply range of 10.8V to 16.5V. These multiplexers also feature high switching speeds and low RON.

[0059] Figure 5 is a circuit schematic diagram of a storage module provided according to an embodiment of the utility model, referring to Figure 5Optionally, the storage module includes: a twenty-ninth resistor R29, a twenty-first resistor R21, a fourth transistor Q4, a fifth diode D5, a thirty-first resistor R31, a one-hundred-and-seventh resistor R107, an eighty-fifth capacitor C85, a thirty-second resistor R32 and an SD card holder SD1; a first end of the twenty-ninth resistor R29 is connected to the power supply end, a second end of the twenty-ninth resistor R29 is connected to a first end of the twenty-first resistor R21 and a base of the fourth transistor Q4, a collector of the fourth transistor Q4 is connected to a second end of the twenty-first resistor R21 and a first end of the one-hundred-and-seventh resistor R107, The second end of the one-hundred-and-seventh resistor R107 is connected to the tenth end of the SD card socket SD1, the emitter of the fourth transistor Q4 is connected to the anode of the fifth diode D5, the first end of the eighty-fifth capacitor C85 and the fourth end 4 of the SD card socket SD1, the second end of the eighty-fifth capacitor C85 is connected to the third end 3 of the SD card socket SD1, the cathode of the fifth diode D5 is connected to the first end of the thirty-first resistor R31, the second end of the thirty-first resistor R31 is grounded, the first end 1 of the SD card socket SD1 is connected to the first end of the thirty-second resistor R32, and the thirty-second resistor R32 is connected to the sixth power supply end +3.3V.

[0060] Figure 6 is a circuit diagram of a voltage conversion module provided according to an embodiment of the utility model, referring to Figure 6 Optionally, the first voltage conversion module includes: a first capacitor E1, a first power chip U12, a third diode D3, a second inductor L2, a seventh capacitor C7 and a first fuse F1; the second voltage conversion module includes: a sixth capacitor E6, a second power chip U13, an eleventh capacitor E11 and a second fuse F2; the first end of the first capacitor E1 is connected to the power supply module and the first end 1 of the first power chip U12, the second end of the first capacitor E1 is grounded, the third end 3 and the fifth end 5 of the first power chip U12 are connected and then grounded, the second end of the first power chip U12 is connected to the cathode of the third diode D3 and the first end of the second inductor L2, and the second end The second end of the inductor L2 is connected to the fourth end 4 of the first power chip U12, the first end of the first fuse F1 and the first end of the seventh capacitor C7, the second end of the seventh capacitor C7 is connected to the anode of the third diode D3 and then grounded, and the second end of the first fuse F1 is connected to the second voltage conversion module; the first end of the sixth capacitor E6 is connected to the second end of the first fuse F1 and the first end 1 of the second power chip U13, the second end of the sixth capacitor E6 is connected to the third end 3 of the second power chip U13 and the second end of the eleventh capacitor E11 and then grounded, and the first end of the eleventh capacitor E11 is connected to the second end 2 of the second power chip U13 and the second fuse F2.

[0061] Continue to refer Figure 6Optionally, the third voltage conversion module includes: a fifth capacitor E5, a third power chip U101, a one-hundred-and-second diode D102, an eleventh inductor L11 and a one-hundred-and-second capacitor C102; the first end of the fifth capacitor E5 is connected to the first voltage conversion module and the first end 1 of the third power chip U101, the second end of the fifth capacitor E5 is connected to the third end 3 of the third power chip U101, the fifth end 5, the anode of the one-hundred-and-second diode D102, and the first end of the one-hundred-and-second capacitor C102 and then grounded, the first end of the eleventh inductor L11 is connected to the second end 2 of the third power chip U101 and the cathode of the one-hundred-and-second diode D102, and the second end of the eleventh inductor L11 is connected to the fourth end 4 of the third power chip U101, the second end of the one-hundred-and-second capacitor C102 and the fourth voltage conversion module.

[0062] Continue to refer Figure 6 Optionally, the fourth voltage conversion module includes: a seventh capacitor E7, a fourth power chip U25, an eighth capacitor E8, a fiftieth capacitor C50 and a ninth resistor R9; the first end of the seventh capacitor E7 is connected to the one hundred and second capacitor C102 and the third end 3 of the fourth power chip U25, the second end of the seventh capacitor E7 is connected to the first end of the ninth resistor R9 and then grounded, the second end of the ninth resistor R9 is grounded, the fourth end 4 of the fourth power chip U25 is connected to the second end, the first end of the eighth capacitor E8 and the first end of the fiftieth capacitor C50, and the first end 1 of the fourth power chip U25 is connected to the second end of the eighth capacitor E8 and the second end of the fiftieth capacitor C50.

[0063] Figure 7 This is a wiring diagram of an analog quantity acquisition circuit board provided according to an embodiment of the utility model, with reference to Figure 7 , the analog quantity acquisition circuit board communication is connected to 1-RS485+ and 1-RS485-, and the new version of the analog quantity acquisition circuit board power supply is connected to 24V DC power supply.

[0064] It should be noted that electrical nodes with the same labels in the drawings are electrically connected, such as +12V, +3.3V, +5V, GND, AGND, +VR2.5, +5.8V, YX-OP15, etc. Electrical nodes with the same characters in the drawings are electrically connected to each other, which is done to make the drawings clear.

[0065] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. An analog quantity acquisition circuit board, characterized in that: include: Main control module, analog quantity acquisition module, communication module and storage module; The analog quantity acquisition module is connected to the main control module, and the analog quantity acquisition module is used to transmit the collected analog quantity signal to the main control module, and the analog quantity signal includes at least one of resistance, current and voltage; The main control module is connected to the storage module and the communication module, and is used to convert the analog signal into a digital signal and transmit it to the storage module and the communication module. The storage module is used to store the digital signal, and the communication module is used for the main control module to communicate with an external analog quantity acquisition circuit board.

2. The analog quantity acquisition circuit board according to claim 1, characterized in that: It also includes a power supply module and a switch module; The switch module is connected to the main control module, the power supply module is connected to the main control module, and the power supply module is used to provide power to the main control module.

3. The analog quantity acquisition circuit board according to claim 2, characterized in that: It also includes a first voltage conversion module, a second voltage conversion module, a third voltage conversion module and a fourth voltage conversion module; the first voltage conversion module is connected to the power supply module, and the first voltage conversion module is used to convert the voltage output by the power supply module into a first preset voltage; The second voltage conversion module is connected to the first voltage conversion module, and the second voltage conversion module is used to convert the first preset voltage into a second preset voltage; The third voltage conversion module is connected to the first voltage conversion module, and the third voltage conversion module is used to convert the first preset voltage into a third preset voltage; The fourth voltage conversion module is connected to the third voltage conversion module, and the fourth voltage conversion module is used to convert the third preset voltage into a fourth preset voltage.

4. The analog quantity acquisition circuit board according to claim 3, characterized in that: The first preset voltage is greater than the third preset voltage, the third preset voltage is greater than the fourth preset voltage, and the fourth preset voltage is greater than the second preset voltage.

5. The analog quantity acquisition circuit board according to claim 1, characterized in that: The analog quantity acquisition module includes: an analog multiplexer, a third capacitor, a first amplifier, an eighth resistor, a twelfth resistor, a fourteenth resistor, a third resistor, a sixteenth resistor, a thirteenth resistor, a fifteenth resistor, a second amplifier, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, an analog-to-digital converter, a nineteenth resistor, a first crystal oscillator, an eighteenth capacitor, a voltage regulator, a zeroth capacitor, an inductor, and a thirty-third capacitor; The eighth end of the analog multiplexer is connected to the first end of the third capacitor and the third end of the first amplifier, the second end of the third capacitor is grounded, the sixth end of the first amplifier is connected to the first end of the eighth resistor, the second end of the eighth resistor is connected to the third end of the second amplifier and the first end of the twelfth resistor, the second end of the twelfth resistor is connected to the first power supply end, the first end of the second amplifier is connected to the fourteenth resistor, the third resistor, the sixteenth resistor and the eighth end of the second amplifier, the second end of the second amplifier is connected to the first end of the thirteenth resistor and the first end of the fifteenth resistor, the second end of the thirteenth resistor is grounded, and the second end of the fifteenth resistor is connected to the The sixth end, the first end of the fifteenth capacitor, the first end of the sixteenth capacitor and the first end of the analog-to-digital converter are connected, the second end of the analog-to-digital converter is connected to the first power supply end, the nineteenth resistor is connected between the fourth end of the analog-to-digital converter and the third end of the first crystal oscillator, the first end of the eighteenth capacitor is connected to the third end of the analog-to-digital converter, the second end of the eighteenth capacitor is grounded, the fourth end of the analog-to-digital converter is connected to the first end of the inductor and the first end of the thirty-third capacitor, the second end of the inductor is connected to the first end of the regulator, the second end of the regulator is connected to the second end of the thirty-third capacitor and the second end of the zeroth capacitor and then grounded, and the first end of the zeroth capacitor is connected to the third end of the regulator.

6. The analog quantity acquisition circuit board according to claim 1, characterized in that: The storage module includes: a twenty-ninth resistor, a twenty-first resistor, a fourth transistor, a fifth diode, a thirty-first resistor, a one hundred and seventh resistor, an eighty-fifth capacitor, a thirty-second resistor and an SD card holder; The first end of the 29th resistor is connected to the power supply end, the second end of the 29th resistor is connected to the first end of the 21st resistor and the base of the fourth transistor, the collector of the fourth transistor is connected to the second end of the 21st resistor and the first end of the 107th resistor, the second end of the 107th resistor is connected to the tenth end of the SD card socket, the emitter of the fourth transistor is connected to the anode of the fifth diode, the first end of the 85th capacitor and the fourth end of the SD card socket, the second end of the 85th capacitor is connected to the third end of the SD card socket, the cathode of the fifth diode is connected to the first end of the 31st resistor, the second end of the 31st resistor is grounded, the first end of the SD card socket is connected to the first end of the 32nd resistor, and the 32nd resistor is connected to the sixth power supply end.

7. The analog quantity acquisition circuit board according to claim 3, characterized in that: The first voltage conversion module includes: a first capacitor, a first power chip, a third diode, a second inductor, a seventh capacitor and a first fuse; The second voltage conversion module includes: a sixth capacitor, a second power chip, an eleventh capacitor and a second fuse; The first end of the first capacitor is connected to the power supply module and the first end of the first power chip, the second end of the first capacitor is grounded, the third end and the fifth end of the first power chip are connected and then grounded, the second end of the first power chip is connected to the cathode of the third diode and the first end of the second inductor, the second end of the second inductor is connected to the fourth end of the first power chip, the first end of the first fuse and the first end of the seventh capacitor, the second end of the seventh capacitor is connected to the anode of the third diode and then grounded, and the second end of the first fuse is connected to the second voltage conversion module; The first end of the sixth capacitor is connected to the second end of the first fuse and the first end of the second power chip, the second end of the sixth capacitor is connected to the third end of the second power chip and the second end of the eleventh capacitor and then grounded, and the first end of the eleventh capacitor is connected to the second end of the second power chip and the second fuse.

8. The analog quantity acquisition circuit board according to claim 3, characterized in that: The third voltage conversion module includes: a fifth capacitor, a third power chip, a one hundred and second diode, an eleventh inductor and a one hundred and second capacitor; The first end of the fifth capacitor is connected to the first voltage conversion module and the first end of the third power supply chip, the second end of the fifth capacitor is connected to the third end, the fifth end, the anode of the first one hundred and second diode, and the first end of the first one hundred and second capacitor of the third power supply chip and then grounded, the first end of the eleventh inductor is connected to the second end of the third power supply chip and the cathode of the first one hundred and second diode, and the second end of the eleventh inductor is connected to the fourth end of the third power supply chip, the second end of the first one hundred and second capacitor, and the fourth voltage conversion module.

9. The analog quantity acquisition circuit board according to claim 8, characterized in that: The fourth voltage conversion module includes: a seventh capacitor, a fourth power chip, an eighth capacitor, a fiftieth capacitor and a ninth resistor; The first end of the seventh capacitor is connected to the first one hundred and second capacitor and the third end of the fourth power chip, the second end of the seventh capacitor is connected to the first end of the ninth resistor and then grounded, the second end of the ninth resistor is grounded, the fourth end of the fourth power chip is connected to the second end, the first end of the eighth capacitor and the first end of the fiftieth capacitor, the first end of the fourth power chip is connected to the second end of the eighth capacitor and the second end of the fiftieth capacitor.

10. The analog quantity acquisition circuit board according to claim 1, characterized in that: The main control module includes an LPC1786 microcontroller.

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