General data acquisition circuit and acquisition card

Abstract

The utility model discloses a general data acquisition circuit and an acquisition card, the general data acquisition circuit comprises a sensor signal acquisition module, a power supply module and a master control module, the acquisition module comprises at least one analog-to-digital converter, the analog signal input end of the analog-to-digital converter is used for being connected with the output end of a sensor, and the analog signal input end of the analog-to-digital converter is used for being connected with the output end of the sensor; the output end of the analog-to-digital converter is connected with the main control module; the power supply module comprises a digital power supply unit and an analog power supply unit, the output end of the digital power supply unit is connected with a digital power supply pin of the analog-to-digital converter, and the output end of the analog power supply unit is connected with an analog power supply pin of the analog-to-digital converter. A digital-to-analog converter in the acquisition module can be a programmable analog-to-digital converter which is high in precision, low in noise, wide in input voltage range and low in noise. The power supply module provides a low-noise voltage-stabilized power supply for the analog-to-digital converter so as to reduce power supply noise and fluctuation, ensure high precision and low noise of sampling signals and optimize signal quality.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of power electronics, and particularly relates to a universal data acquisition circuit and an acquisition card. BACKGROUND

[0002] A superconducting signal acquisition system is widely applied to fields such as superconducting material research, quantum computing and particle physics. In the superconducting signal acquisition system, a plurality of types of collectors need to be arranged for collecting a plurality of parameters or states, for example, a temperature sensor, a current collector, a magnetic field collector and the like. The signals used for research are usually weak and susceptible to noise interference, and different sensor signals have different output characteristics. For example, a thermocouple signal output by a temperature sensor can be designed into a signal conditioning circuit based on a precision amplifier; a Hall effect signal output by a magnetic field sensor can be designed into a differential amplification circuit and a corresponding gain adjustment module; and an analog signal output by a current sensor can be designed into a current conversion circuit based on an operational amplifier.

[0003] Therefore, how to improve the signal acquisition quality in the case of diversified sampling requirements and weak and susceptible sensor signals becomes a technical problem to be solved. CONTENT OF THE INVENTION

[0004] Therefore, the application provides a universal data acquisition circuit and an acquisition card to solve the technical problem of how to improve the signal acquisition quality in the case of diversified sampling requirements and weak and susceptible sensor signals in the related art.

[0005] The application provides a universal data acquisition circuit, which comprises a sensor signal acquisition module, a power supply module and a main control module. The acquisition module comprises at least one analog-to-digital converter. An analog signal input end of the analog-to-digital converter is connected with an output end of a sensor. An output end of the analog-to-digital converter is connected with the main control module. The power supply module comprises a digital power supply unit and an analog power supply unit. An output end of the digital power supply unit is connected with a digital power supply pin of the analog-to-digital converter. An output end of the analog power supply unit is connected with an analog power supply pin of the analog-to-digital converter.

[0006] In an embodiment, the analog-to-digital converter further comprises a serial communication interface connected with a serial communication interface of the main control unit, and used for receiving a working mode configuration instruction output by the main control unit.

[0007] In an embodiment, the serial communication interface comprises an SPI interface or an IIC interface.

[0008] In an embodiment, the analog-to-digital converter comprises an ADS analog-to-digital conversion chip.

[0009] In an embodiment, the digital power supply unit comprises a first voltage stabilizing power supply chip, an input end of the first voltage stabilizing power supply chip is connected with a first power supply filter circuit, and an output end of the first voltage stabilizing power supply chip is connected with a second power supply filter circuit.

[0010] In an embodiment, the analog power supply unit comprises a second voltage stabilizing power supply chip, an input end of the second voltage stabilizing power supply chip is connected with a third power supply filter circuit, and an output end of the second voltage stabilizing power supply chip is connected with a fourth power supply filter circuit.

[0011] In an embodiment, the power supply module further comprises a power supply, the power supply comprises a dual-channel bipolar power supply chip, and the dual-channel bipolar power supply chip has a bipolar output end connected with a bipolar power supply end of the analog-to-digital converter.

[0012] In an embodiment, the power supply module further comprises a DC / DC conversion circuit, an input end of the DC / DC conversion circuit is connected with an input power supply, and output ends of the DC / DC conversion circuit are respectively connected with input ends of the digital power supply unit and the analog power supply unit through a fifth power supply filter circuit.

[0013] In an embodiment, the power supply module further comprises a signal filter circuit between the acquisition module and the main control module.

[0014] According to a second aspect, the embodiments of the present application provide a universal data acquisition card, which comprises the universal data acquisition circuit described in any one of the first aspect, at least one sensor input end for connecting at least one sensor.

[0015] The present application has at least the following beneficial effects:

[0016] The universal data acquisition circuit provided by the application comprises a sensor signal acquisition module, a power module and a main control module, wherein the acquisition module comprises at least one analog-to-digital converter, the analog signal input end of the analog-to-digital converter is used to be connected with the output end of the sensor, and the output end of the analog-to-digital converter is connected with the main control module; the power module comprises a digital power unit and an analog power unit, wherein the output end of the digital power unit is connected with the digital power pin of the analog-to-digital converter, and the output end of the analog power unit is connected with the analog power pin of the analog-to-digital converter. The digital-to-analog converter in the acquisition module can adopt a high-precision and low-noise analog-to-digital converter. The analog-to-digital converter can adopt a high-resolution, wide-input-voltage-range and low-noise programmable analog-to-digital converter to adapt to the measurement requirements of high-precision and multiple types of sensor signals. The power module adopts a separate digital power unit and an analog power unit, which are connected with the digital power pin and the analog power pin of the analog-to-digital converter respectively, so as to provide a low-noise stabilized power supply for the analog-to-digital converter, to reduce the power supply noise and fluctuation, ensure the high precision and low noise of the sampling signal, optimize the signal quality and prevent the influence of the power supply noise on the sampling result. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed to be used in the description of the specific embodiments or prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0018] Figure 1 is a modular schematic diagram of the universal data acquisition circuit provided by the embodiment of the present application;

[0019] Figure 2 is a circuit principle schematic diagram of the acquisition module in the universal data acquisition circuit provided by the embodiment of the present application;

[0020] Figure 3 is a circuit principle schematic diagram of the digital power unit in the universal data acquisition circuit provided by the embodiment of the present application;

[0021] Figure 4 is a circuit principle schematic diagram of the analog power unit in the universal data acquisition circuit provided by the embodiment of the present application;

[0022] Figure 5 is a circuit principle schematic diagram of the power supply in the universal data acquisition circuit provided by the embodiment of the present application;

[0023] Figure 6A circuit principle schematic diagram of a DC / DC conversion circuit in a general data acquisition circuit is provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts should fall into the scope of the present application.

[0025] According to an embodiment of the present application, a general data acquisition circuit is provided, as shown in Figures 1 to 6 The circuit includes a sensor signal acquisition module 10, a power supply module 20 and a master control module 30. The acquisition module 10 includes at least one analog-to-digital converter 11. An analog signal input end of the analog-to-digital converter 11 is used to be connected with an output end of a sensor. An output end of the analog-to-digital converter 11 is connected with the master control module 30. The power supply module 20 includes a digital power supply unit 21 and an analog power supply unit 22. An output end of the digital power supply unit 21 is connected with a digital power supply pin of the analog-to-digital converter 11. An output end of the analog power supply unit 22 is connected with an analog power supply pin of the analog-to-digital converter 11.

[0026] In this embodiment, the general data acquisition circuit is suitable for scenarios of collecting various parameters or states, such as temperature sensor collecting temperature signal, current collector collecting current, magnetic field collector collecting magnetic field strength, etc. Different types of sensors have different output characteristics. In the fields of superconducting material research, quantum computing, particle physics, etc., the above-mentioned signals for research are usually weak and susceptible to noise interference, and different sensor signals have different output characteristics. For example, for the thermocouple signal output by the temperature sensor, a signal conditioning circuit based on a precision amplifier can be designed; for the Hall effect signal output by the magnetic field sensor, a differential amplification circuit and a corresponding gain adjustment module can be designed; for the analog signal output by the current sensor, a current conversion circuit based on an operational amplifier can be designed. Therefore, in this embodiment, the digital-to-analog converter in the acquisition module 10 can adopt a high-precision, low-noise analog-to-digital converter 11. The analog-to-digital converter 11 can adopt a high-resolution, wide-input-voltage-range, low-noise programmable analog-to-digital converter 11 to meet the measurement requirements of high-precision, multi-type sensor signals. The power supply module 20 adopts a separate digital power supply unit 21 and an analog power supply unit 22, which are connected with the digital power supply pin and the analog power supply pin of the analog-to-digital converter 11 respectively, to provide low-noise stabilized power supply for the analog-to-digital converter 11, so as to reduce power supply noise and fluctuation, ensure high precision and low noise of the sampling signal, optimize signal quality, and prevent the influence of power supply noise on the sampling result.

[0027] In one embodiment, the analog-to-digital converter 11 can adopt an ADS analog-to-digital conversion chip U1, which can convert analog signals to digital signals with high precision, is suitable for precision measurement scenarios, has a differential input range of ±20V and an absolute input range of ±15.5V, can be connected with various sensors, and integrates a low-noise programmable gain amplifier with a gain range of 0.125 to 128 and an input impedance of 1GΩ, which can reduce sensor load error and can be directly connected with strain gauge bridge, resistance temperature detector and thermocouple sensor, etc. The ADS analog-to-digital conversion chip U1 can adopt SPI interface or IIC interface to communicate with microcontroller or other digital devices, facilitating data transmission and control. Moreover, on the premise of ensuring precision, the system power consumption is optimized, which is suitable for portable devices and low-power consumption occasions. For example, ADS125H01 / ADS125H02 / ADS1258, etc. can be used as the ADS analog-to-digital conversion chip U1 in this embodiment, which can be taken as an example for illustration as shown in the following circuit diagram of ADS125H01 chip and its corresponding circuit diagram. Figure 2

[0028] ​In the embodiment, when the sensors are multiple, the analog-to-digital converter 11 can be multiple or one. Exemplarily, multiple single-channel analog-to-digital converters 11 or one multi-channel analog-to-digital converter 11 can be used. The output characteristics of different sensors can be adapted by the master control module 30 setting the parameters of the analog-to-digital converter 11.

[0029] In an embodiment, since the low-noise programmable gain amplifier is integrated in the analog-to-digital converter 11, the master control module 30 can communicate with the analog-to-digital converter 11 through the serial communication interface 111. The master control module 30 configures the working mode of the analog-to-digital converter 11 through the serial communication interface 111, including the sampling frequency, the gain adjustment, the reference voltage setting, etc. The master control module 30 adjusts the configuration parameters of the ADC to ensure that the system adapts to different signal sources and application requirements. Exemplarily, the serial communication interface 111 can include an SPI interface or an IIC interface.

[0030] In an embodiment, as shown in Figure 3 The digital power supply unit 21 includes a first voltage stabilizing power supply chip U2, the input end of the first voltage stabilizing power supply chip U2 is connected with a first power supply filter circuit 211, and the output end of the first voltage stabilizing power supply chip U2 is connected with a second power supply filter circuit 212. Exemplarily, the first voltage stabilizing power supply chip U2 can provide a 3.3V digital power supply voltage for the analog-to-digital converter 11. In the embodiment, the first power supply filter circuit 211 and the second power supply filter circuit 212 can be a capacitor filter circuit. The first power supply filter circuit 211 is connected between the input end of the first voltage stabilizing power supply chip U2 and the ground, used to filter out the low-frequency and / or high-frequency noise in the input power supply signal of the first voltage stabilizing power supply chip U2, prevent noise input, and the second power supply filter circuit 212 is arranged between the output end of the first voltage stabilizing power supply chip U2 and the ground, which can filter out the high-frequency noise of the output, improve the stability of the output voltage, and prevent the influence of noise on the subsequent circuit. Exemplarily, the first voltage stabilizing power supply chip U2 can be a forward low-voltage drop linear voltage stabilizing chip, for example, a PMOS type, NMOS type, PNP type or NPN type forward low-voltage drop linear voltage stabilizing chip.

[0031] In an embodiment, as shown in Figure 4As shown, the analog power supply unit 22 includes a second voltage stabilizing power supply chip U3, the input end of which is connected with a third power supply filter circuit 221, and the output end of which is connected with a fourth power supply filter circuit 222. The second voltage stabilizing power supply chip U3 can provide the analog power supply voltage of AVDD for the analog-to-digital converter 11. The second voltage stabilizing power supply chip U3 can also be a CMOS low-voltage drop linear stabilizing chip. The third power supply filter circuit 221 is connected between the input end of the second voltage stabilizing power supply chip U3 and the ground, for filtering out the low-frequency and / or high-frequency noise in the input power supply signal of the second voltage stabilizing chip U3, preventing noise input. The fourth power supply filter circuit 222 arranged between the output end of the second voltage stabilizing power supply chip U3 and the ground can filter out the high-frequency noise of the output, improve the stability of the output voltage, and prevent the influence of noise on the subsequent circuit. The noise is filtered for the analog circuit to optimize the signal quality and prevent the influence of power supply noise on the ADC conversion result.

[0032] In an embodiment, as shown in Figure 5 The power supply module 20 further includes a power supply power supply 23, which includes a dual-channel bipolar power supply chip U4 with a bipolar output end connected with the bipolar power supply end of the analog-to-digital converter 11. The power supply power supply 23 can provide the power supply voltage of +14V and -14V for the analog-to-digital converter 11.

[0033] In an embodiment, as shown in Figure 5 The power supply module 20 further includes a DC / DC conversion circuit 24, the input end of which is connected with the input power supply, and the output end of which is connected with the input end of the digital power supply unit 21 and the analog power supply unit 22 through a fifth power supply filter circuit 241. In this embodiment, the DC / DC conversion circuit 24 can be a step-down conversion circuit. The addition of the fifth power supply filter circuit 241 at the output end can filter out the switching waveform noise in the step-down conversion circuit, and can also filter out the external noise caused by the output power supply. The power supply module 20 reduces the power supply noise and fluctuation through the precise voltage stabilizing power supply and the high-efficiency filter circuit, to ensure the high precision and low noise of the sampling signal. The design of the power supply module 20 also includes the noise filter for the analog circuit to optimize the signal quality and prevent the influence of power supply noise on the ADC conversion result.

[0034] In an embodiment, the master module 30 can adopt an FPGA chip, and a signal filtering circuit is further included between the acquisition module 10 and the master module 30. The master module 30 can utilize its powerful computing capability to implement a hardware filtering function, remove unnecessary noise and interference, and improve the quality and signal-to-noise ratio of the signal. The result of the hardware filtering process will be optimized in real time after ADC sampling. Signal compensation and calibration: through a designed software and hardware compensation mechanism, the master chip can dynamically adjust the gain and compensate for the deviation according to the real-time collected data, and correct the measurement deviation caused by the sensor, temperature or hardware error. In this embodiment, according to the pin function of the analog-to-digital conversion chip and the FPGA chip, a reasonable signal path, a noise suppression circuit, a gain adjustment module and a data transmission interface are designed. According to the characteristics of different sensors, the signal conditioning circuit is customized to ensure that the signal is adapted to the ADC module. A low-noise filter is designed in the power supply part to minimize the impact of the power supply on the signal.

[0035] The application also provides a universal data acquisition card, which comprises the universal data acquisition circuit described in the above embodiments, and at least one sensor input end provided on the circuit and used for connecting at least one sensor.

[0036] In the above embodiments of the application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0037] The above is only the preferred embodiment of the application, and it should be pointed out that for those skilled in the art, without departing from the principle of the application, a number of improvements and refinements can be made, which should also be regarded as the protection scope of the application.

Claims

1. A universal data acquisition circuit, characterized by, The application relates to a universal data acquisition circuit, which comprises a sensor signal acquisition module, a power supply module and a main control module, wherein the acquisition module comprises at least one analog-to-digital converter, the analog signal input end of the analog-to-digital converter is used for being connected with the output end of a sensor, and the output end of the analog-to-digital converter is connected with the main control module. The power supply module comprises a digital power supply unit and an analog power supply unit, wherein the output end of the digital power supply unit is connected with the digital power supply pin of the analog-to-digital converter, and the output end of the analog power supply unit is connected with the analog power supply pin of the analog-to-digital converter. The analog-to-digital converter further comprises a serial communication interface which is connected with the serial communication interface of the main control module and is used for receiving the working mode configuration instruction output by the main control module.

2. The universal data acquisition circuit of claim 1, wherein, The serial communication interface comprises an SPI interface or an IIC interface.

3. The universal data acquisition circuit of claim 2, wherein, The analog-to-digital converter comprises an ADS analog-to-digital conversion chip.

4. The universal data acquisition circuit of any one of claims 1 to 3, wherein, The digital power supply unit comprises a first voltage stabilizing power supply chip, the input end of the first voltage stabilizing power supply chip is connected with a first power supply filter circuit, and the output end of the first voltage stabilizing power supply chip is connected with a second power supply filter circuit.

5. The universal data acquisition circuit of claim 1, wherein, The analog power supply unit comprises a second voltage stabilizing power supply chip, the input end of the second voltage stabilizing power supply chip is connected with a third power supply filter circuit, and the output end of the second voltage stabilizing power supply chip is connected with a fourth power supply filter circuit.

6. The universal data acquisition circuit of claim 1, wherein, The power supply module further comprises a power supply, the power supply comprises a double-path bipolar power supply chip, has a bipolar output end, and the bipolar output end is connected with the bipolar power supply end of the analog-to-digital converter.

7. The universal data acquisition circuit of claim 1, wherein, The power supply module further comprises a DC / DC conversion circuit, the input end of the DC / DC conversion circuit is connected with an input power supply, the output end of the DC / DC conversion circuit is connected with the input ends of the digital power supply unit and the analog power supply unit through a fifth power supply filter circuit.

8. A universal data acquisition circuit as claimed in any one of claims 5 to 7, characterized in that, The acquisition module and the main control module further comprise a signal filter circuit.

9. The universal data acquisition circuit of claim 1, wherein, The application relates to a universal data acquisition circuit, which comprises a sensor signal acquisition module, a power supply module and a main control module, wherein the acquisition module comprises at least one analog-to-digital converter, the analog signal input end of the analog-to-digital converter is used for being connected with the output end of a sensor, and the output end of the analog-to-digital converter is connected with the main control module.

10. A universal data acquisition card, characterized by The power supply module comprises a digital power supply unit and an analog power supply unit, wherein the output end of the digital power supply unit is connected with the digital power supply pin of the analog-to-digital converter, and the output end of the analog power supply unit is connected with the analog power supply pin of the analog-to-digital converter. The serial communication interface comprises an SPI interface or an IIC interface. The analog-to-digital converter comprises an ADS analog-to-digital conversion chip. The digital power supply unit comprises a first voltage stabilizing power supply chip, the input end of the first voltage stabilizing power supply chip is connected with a first power supply filter circuit, and the output end of the first voltage stabilizing power supply chip is connected with a second power supply filter circuit. The analog power supply unit comprises a second voltage stabilizing power supply chip, the input end of the second voltage stabilizing power supply chip is connected with a third power supply filter circuit, and the output end of the second voltage stabilizing power supply chip is connected with a fourth power supply filter circuit. The power supply module further comprises a power supply, the power supply comprises a double-path bipolar power supply chip, has a bipolar output end, and the bipolar output end is connected with the bipolar power supply end of the analog-to-digital converter. The power supply module further comprises a DC / DC conversion circuit, the input end of the DC / DC conversion circuit is connected with an input power supply, the output end of the DC / DC conversion circuit is connected with the input ends of the digital power supply unit and the analog power supply unit through a fifth power supply filter circuit. The acquisition module and the main control module further comprise a signal filter circuit. The application relates to a universal data acquisition circuit, which comprises a sensor signal acquisition module, a power supply module and a main control module, wherein the acquisition module comprises at least one analog-to-digital converter, the analog signal input end of the analog-to-digital converter is used for being connected with the output end of a sensor, and the output end of the analog-to-digital converter is connected with the main control module. The power supply module comprises a digital power supply unit and an analog power supply unit, wherein the output end of the digital power supply unit is connected with the digital power supply pin of the analog-to-digital converter, and the output end of the analog power supply unit is connected with the analog power supply pin of the analog-to-digital converter. The serial communication interface comprises an SPI interface or an IIC interface. The analog-to-digital converter comprises an ADS analog-to-digital conversion chip. The digital power supply unit comprises a first voltage stabilizing power supply chip, the input end of the first voltage stabilizing power supply chip is connected with a first power supply filter circuit, and the output end of the first voltage stabilizing power supply chip is connected with a second power supply filter circuit. The analog power supply unit comprises a second voltage stabilizing power supply chip, the input end of the second voltage stabilizing power supply chip is connected with a third power supply filter circuit, and the output end of the second voltage stabilizing power supply chip is connected with a fourth power supply filter circuit. The power supply module further comprises a power supply, the power supply comprises a double-path bipolar power supply chip, has a bipolar output end, and the bipolar output end is connected with the bipolar power supply end of the analog-to-digital converter. The power supply module further comprises a DC / DC conversion circuit, the input end of the DC / DC conversion circuit is connected with an input power supply, the output end of the DC / DC conversion circuit is connected with the input ends of the digital power supply unit and the analog power supply unit through a fifth power supply filter circuit. The acquisition module and the main control module further comprise a signal filter circuit. The application relates to a universal data acquisition circuit, which comprises a sensor signal acquisition module, a power supply module and a main control module, wherein the acquisition module comprises at least one analog-to-digital converter, the analog signal input end of the analog-to-digital converter is used for being connected with the output end of a sensor, and the output end of the analog-to-digital converter is connected with the main control module. The power supply module comprises a digital power supply unit and an analog power supply unit, wherein the output end of the digital power supply unit is connected with the digital power supply pin of the analog-to-digital converter, and the output end of the analog power supply unit is connected with the analog power supply pin of the analog-to-digital converter. The serial communication interface comprises an SPI interface or an IIC interface. The analog-to-digital converter comprises an ADS analog-to-digital conversion chip. The digital power supply unit comprises a first voltage stabilizing power supply chip, the input end of the first voltage stabilizing power supply chip is connected with a first power supply filter circuit, and the output end of the first voltage stabilizing power supply chip is connected with a second power supply filter circuit. The analog power supply unit comprises a second voltage stabilizing power supply chip, the input end of the second voltage stabilizing power supply chip is connected with a third power supply filter circuit, and the output end of the second voltage stabilizing power supply chip is connected with a fourth power supply filter circuit. The power supply module further comprises a power supply, the power supply comprises a double-path bipolar power supply chip, has a bipolar output end, and the bipolar output end is connected with the bipolar power supply end of the analog-to-digital converter. The power supply module further comprises a DC / DC conversion circuit, the input end of the DC / DC conversion circuit is connected with an input power supply, the output end of the DC / DC conversion circuit is connected with the input ends of the digital power supply unit and the analog power supply unit through a fifth power supply filter circuit. The acquisition module and the main control module further comprise a signal filter circuit. The application relates to a universal data acquisition circuit, which comprises a sensor signal acquisition module, a power supply module and a main control module, wherein the acquisition module comprises at least one analog-to-digital converter, the analog signal input end of the analog-to-digital converter is used for being connected with the output end of a sensor, and the output end of the analog-to-digital converter is connected with the main control module. The power supply module comprises a digital power supply unit and an analog power supply unit, wherein the output end of the digital power supply unit is connected with the digital power supply pin of the analog-to-digital converter, and the output end of the analog power supply unit is connected with the analog power supply pin of the analog-to-digital converter. The serial communication interface comprises an SPI interface or an IIC interface. The analog-to-digital converter comprises an ADS analog-to-digital conversion chip. The digital power supply unit comprises a first voltage stabilizing power supply chip, the input end of the first voltage stabilizing power supply chip is connected with a first power supply filter circuit, and the output end of the first voltage stabilizing power supply chip is connected with a second power supply filter circuit. The analog power supply unit comprises a second voltage stabilizing power supply chip, the input end of the second voltage

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