CN115524532A - Signal acquisition circuit and signal acquisition method - Google Patents
Signal acquisition circuit and signal acquisition method Download PDFInfo
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- CN115524532A CN115524532A CN202211304473.1A CN202211304473A CN115524532A CN 115524532 A CN115524532 A CN 115524532A CN 202211304473 A CN202211304473 A CN 202211304473A CN 115524532 A CN115524532 A CN 115524532A
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Abstract
The embodiment of the invention relates to the field of semi-physical simulation tests and discloses a signal acquisition circuit and a signal acquisition method. The signal acquisition circuit in the invention carries out signal conditioning, analog-to-digital conversion and isolation on multi-path alternating voltage, direct voltage and direct current signals through the analog quantity IO circuit, then transmits the signals to the control circuit based on the FPGA for processing and sending the signals to the upper computer, realizes high-precision and multi-path acquisition of large voltage and large current in a high-integration mode, and has the advantages of small volume, low cost, flexible and variable interface of the whole circuit board and convenience for system installation and test.
Description
Technical Field
The embodiment of the invention relates to the field of semi-physical simulation tests, in particular to a signal acquisition circuit and a signal acquisition method.
Background
The signal acquisition is used as an important component in the simulation test system, determines whether the simulation test system can receive and process on-site multi-channel high-precision signals, and plays an important role in the simulation test system. The traditional voltage and current signal acquisition technology adopts two modes of a sensor, a transmitter or an industrial personal computer acquisition board card. The sensor and transmitter modules can only collect one path of voltage or current signals, if a plurality of paths of voltage and current signals need to be collected, a plurality of sensor or transmitter modules need to be configured, the size is large, the cost is high, the precision of the collected signals is not high, and the highest precision is 0.2%. According to the technical method for collecting the board card by the industrial personal computer provided by manufacturers such as NI and Hua, the collected voltage and current signal range is lower, generally within +/-10V and maximally +/-60V, and most interfaces are fixed buses such as PCI and CPCI, so that the size is large and the configuration cost is high.
Therefore, the inventors found that at least the following problems exist in the related art: the technical method of the sensor and the transmitter can only be used in the occasions with less signal quantity and low precision required by the system, but is not suitable for the occasions with more signal channels and high acquisition precision; the technical method for collecting the board card by the industrial personal computer is large in size and high in configuration cost, and is not suitable for occasions of large-voltage and large-current collection and flexible and changeable signal input interfaces.
Disclosure of Invention
The invention aims to provide a signal acquisition circuit which is used for a simulation test system, realizes high-precision and multi-channel acquisition of large voltage and large current, has high integration level of the whole circuit board, and is small in size, low in cost, flexible and variable in interface and convenient for installation and test of the system.
To solve the above technical problem, an embodiment of the present invention provides a signal acquisition circuit, including: the analog IO circuit and the control circuit based on the FPGA; the analog quantity IO circuit is connected with the FPGA-based control circuit; the analog quantity IO circuit is used for receiving analog quantity signal input of N paths of alternating voltage, direct voltage and direct current, carrying out operational amplification conditioning on an input voltage signal, carrying out isolation sampling amplification conditioning on an input current signal, carrying out analog quantity-to-digital quantity conversion on a conditioned signal, and inputting the converted digital signal to the FPGA-based control circuit after isolation; the FPGA-based control circuit is used for processing the received digital signals and sending the processed signals to an upper computer.
The embodiment of the invention also provides a signal acquisition method, which comprises the following steps: receiving analog quantity signal input of alternating voltage, direct voltage and direct current of N paths; conditioning an input signal; the method comprises the steps of carrying out operational amplification conditioning on an input voltage signal, and carrying out isolation sampling amplification conditioning on an input current signal; converting the conditioned signal from an analog quantity to a digital quantity; the converted digital signals are isolated and then input into a control circuit based on an FPGA for processing; and sending the processed signal to an upper computer.
In the signal acquisition circuit in the embodiment of the invention, after the analog quantity IO circuit is used for carrying out signal conditioning, analog-to-digital conversion and isolation on the multi-path alternating voltage, direct voltage and direct current signals, the signals are transmitted to the control circuit based on the FPGA for processing and are sent to the upper computer, the high-precision and multi-channel acquisition of large voltage and large current is realized in a high-integration-degree mode, the whole circuit board has small volume, low cost and flexible and variable interface, and the system is convenient to install and test.
In addition, the analog IO circuit includes: k voltage analog quantity IO modules and M current analog quantity IO modules; the voltage analog IO module is respectively used for receiving analog quantity signal input of p paths of alternating current voltage or direct current voltage, carrying out operational amplification conditioning on the input voltage signal, carrying out analog quantity-to-digital quantity conversion on the signal after the operational amplification conditioning, and inputting the digital signal after the conversion into the FPGA-based control circuit after the digital signal is isolated; the current analog quantity IO module is respectively used for receiving analog quantity signal input of q paths of direct current, carrying out isolation sampling, amplification and conditioning on the input current signal, carrying out analog quantity-to-digital quantity conversion on the signal subjected to isolation sampling, amplification and conditioning, and inputting the digital signal subjected to conversion into the FPGA-based control circuit after isolation; wherein K × p + M × q = N. The analog quantity IO circuit integrates a plurality of voltage analog quantity IO modules and current analog quantity IO modules, and realizes multi-channel and large-scale acquisition of multiple paths of voltage and current signals simultaneously by carrying out operational amplification conditioning on voltage signals and carrying out isolated sampling amplification conditioning on current signals; the conditioned analog signals are converted from analog quantity to digital quantity, so that the digital signals are conveniently transmitted to a control circuit based on an FPGA for processing.
In addition, the voltage input reference ground of each voltage analog quantity IO module is isolated from the digital ground and the current input reference ground of the signal acquisition circuit; in each current analog quantity IO module, the reference grounds of all current inputs are isolated from each other and from the voltage input reference ground. The analog signals are prevented from being influenced, and the safety of the signal acquisition circuit and the reliability and stability of the operation of a circuit system are ensured.
In addition, the FPGA-based control circuit includes: the SOC integrated chip is used for processing the output signal of the analog IO circuit and comprises an ARM processor and an FPGA; DDR2 and NOR Flash connected with the SOC integrated chip, wherein the DDR2 and the NOR Flash are used for expanding the memory; and the Ethernet port is connected with the SOC integrated chip and is used for signal data transmission between the FPGA-based control circuit and the upper computer. The FPGA has the characteristics of multiple ports and programmable setting, can realize acquisition of multi-channel digital quantity signals, ensures high-precision digital signal processing, ensures small volume and low cost of a multi-channel signal acquisition circuit board, has flexible and variable interfaces and is convenient for installation and test of a system.
In addition, the signal acquisition circuit further comprises: the power supply and K + M isolated power supplies; the power supply is correspondingly connected with the voltage analog quantity IO module and the current analog quantity IO module in the analog quantity IO circuit through the isolation power supplies; the power supply is used for supplying power for the analog IO circuit and the FPGA-based control circuit through the isolation power supply. The isolation power supply ensures that each module connected with the isolation power supply in the signal acquisition circuit works independently and is not interfered.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings which correspond to and are not to be construed as limiting the embodiments, in which elements having the same reference numeral designations represent like elements throughout, and in which the drawings are not to be construed as limiting in scale unless otherwise specified.
FIG. 1 is a circuit diagram of a signal acquisition circuit according to an embodiment of the present invention;
FIG. 2 is a diagram of another signal acquisition circuit according to an embodiment of the present invention;
fig. 3 is a control circuit diagram based on an FPGA according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation manner of the present invention, and the embodiments may be mutually incorporated and referred to without contradiction.
The invention relates to a signal acquisition circuit, which can be applied to the field of semi-physical simulation tests. In this embodiment, a signal acquisition circuit includes: the analog IO circuit and the control circuit based on the FPGA; the analog quantity IO circuit is connected with the FPGA-based control circuit; the analog quantity IO circuit is used for receiving analog quantity signal input of N paths of alternating voltage, direct voltage and direct current, carrying out operational amplification conditioning on an input voltage signal, carrying out isolation sampling amplification conditioning on an input current signal, carrying out analog quantity-to-digital quantity conversion on a conditioned signal, and inputting the converted digital signal to the FPGA-based control circuit after isolation; the control circuit based on the FPGA is used for processing the received digital signals and sending the processed signals to an upper computer. The analog quantity IO circuit carries out signal conditioning, analog-to-digital conversion and isolation on a plurality of paths of alternating voltage, direct voltage and direct current signals, transmits the signals to the control circuit based on the FPGA for processing and sending the signals to the upper computer, realizes high-precision and multi-channel acquisition of large voltage and large current in a high-integration-level mode, and is small in size, low in cost, flexible and variable in interface and convenient for installation and test of a system. The following describes implementation details of the signal acquisition circuit of the present embodiment in detail, and the following description is only provided for facilitating understanding of the implementation details and is not necessary for implementing the present embodiment.
As shown in fig. 1, a signal acquisition circuit includes: the analog IO circuit and the FPGA-based control circuit are connected; the analog quantity IO circuit is connected with the FPGA-based control circuit; the analog quantity IO circuit is used for receiving analog quantity signal input of N paths of alternating voltage, direct voltage and direct current, carrying out operational amplification conditioning on an input voltage signal, carrying out isolation sampling amplification conditioning on an input current signal, carrying out analog quantity-to-digital quantity conversion on a conditioned signal, and inputting the converted digital signal to the FPGA-based control circuit after isolation; the control circuit based on the FPGA is used for processing the received digital signals and sending the processed signals to an upper computer.
In one example, an analog IO circuit includes: k voltage analog quantity IO modules and M current analog quantity IO modules; the voltage analog IO module is respectively used for receiving analog quantity signal input of p paths of alternating current voltage or direct current voltage, carrying out operational amplification conditioning on the input voltage signal, carrying out analog quantity-to-digital quantity conversion on the signal after the operational amplification conditioning, and inputting the digital signal after the conversion into the FPGA-based control circuit after the digital signal is isolated; the current analog quantity IO module is respectively used for receiving analog quantity signal input of q paths of direct current, carrying out isolation sampling, amplification and conditioning on the input current signal, carrying out analog quantity-to-digital quantity conversion on the signal subjected to isolation sampling, amplification and conditioning, and inputting the digital signal subjected to conversion into the FPGA-based control circuit after isolation; wherein K × p + M × q = N. The analog quantity IO circuit integrates a plurality of voltage analog quantity IO modules and current analog quantity IO modules, and realizes multi-channel and large-scale acquisition of multi-channel voltage and current signals simultaneously by carrying out operational amplification conditioning on voltage signals and carrying out isolated sampling amplification conditioning on current signals; the conditioned analog signals are converted from analog quantity to digital quantity, so that the digital signals are conveniently transmitted to a control circuit based on an FPGA for processing.
In one example, the voltage input reference ground of each voltage analog quantity IO module is isolated from the digital ground and the current input reference ground of the signal acquisition circuit, namely the voltage input reference ground of each voltage analog quantity IO module is isolated from the digital ground and the other reference ground of the signal acquisition circuit; in each current analog quantity IO module, the reference grounds of the current inputs of all paths are isolated from each other and from the voltage input reference ground, namely other reference grounds. The analog signal can be prevented from being influenced, and the safety of the signal acquisition circuit and the reliability and stability of the operation of a circuit system are ensured.
In one example, a voltage analog IO module includes: the operational amplifier conditioning circuit is used for performing operational amplifier conditioning on p paths of input alternating-current voltage or direct-current voltage signals; the analog-to-digital conversion circuit is connected with the operational amplifier conditioning circuit and is used for converting the signals after the operational amplifier conditioning from analog quantity to digital quantity; and the digital isolator is connected with the analog-to-digital conversion circuit and used for inputting the converted digital signals to the FPGA-based control circuit.
In one example, the operational amplifier conditioning circuit comprises a precision resistor, a following circuit and a reverse amplifying circuit; the precision resistor is connected with the following circuit, and the following circuit is connected with the reverse amplification circuit; the precision resistor is used for dividing the voltage signal input by each path of the operational amplifier conditioning circuit and outputting the divided voltage signal to the follower circuit; the follower circuit is used for outputting the voltage signal after voltage division to the reverse amplification circuit, and is used for impedance matching and eliminating the influence between circuits connected with the follower circuit; the reverse amplification circuit is used for converting the input voltage signal into a voltage signal with a preset range value.
In one example, a current analog quantity IO module includes: the isolation sampling amplifying circuit is used for carrying out isolation sampling amplification conditioning on an input current signal of q paths of direct current; the analog-to-digital conversion circuit is connected with the isolated sampling amplification circuit and is used for converting the signals subjected to isolated sampling amplification into digital quantity; and the digital isolator is connected with the analog-to-digital conversion circuit and used for inputting the converted digital signals to the FPGA-based control circuit.
In one example, the isolation sampling amplification circuit comprises a sampling resistor and an isolation amplification circuit; the sampling resistor is connected with the isolation amplifying circuit; the sampling resistor is used for converting input mutually isolated current signals into voltage signals with preset threshold values; the isolation amplifying circuit is used for amplifying the voltage signal with the preset threshold value by a preset multiple.
In one example, an FPGA-based control circuit includes: the SOC integrated chip is used for processing an output signal of the analog IO circuit and comprises an ARM processor and an FPGA; DDR2 and NOR Flash connected with the SOC integrated chip are used for expanding the memory; and the Ethernet port connected with the SOC integrated chip is used for transmitting signal data between the FPGA-based control circuit and the upper computer.
In one example, the signal acquisition circuit further comprises: the power supply and K + M isolated power supplies; the power supply is correspondingly connected with a voltage analog quantity IO module and a current analog quantity IO module in the analog quantity IO circuit through each isolation power supply; and the power supply is used for supplying power to the analog IO circuit and the FPGA-based control circuit through the isolation power supply. The isolation power supply ensures that each module connected with the isolation power supply in the signal acquisition circuit works independently and is not interfered.
Specifically, as shown in fig. 2, the analog IO circuit may include 3 voltage analog IO modules and 1 current analog IO module; the voltage analog IO module is respectively used for receiving the input of analog quantity signals of 15 paths of 0-50V direct current voltage, 15 paths of 0-350V direct current voltage and 15 paths of 0-200V alternating current voltage, carrying out operational amplification conditioning on the input voltage signals, carrying out analog quantity-to-digital quantity conversion on the signals subjected to the operational amplification conditioning, and inputting the digital signals subjected to the conversion into the control circuit based on the FPGA after the digital signals are isolated; the current analog quantity IO module is used for collecting analog quantity signals of 5 paths of 0-5A direct currents, isolating, sampling, amplifying and conditioning the collected current signals, converting the signals subjected to the isolation, sampling, amplifying and conditioning from analog quantity to digital quantity, and inputting the converted digital signals to the FPGA-based control circuit after isolation.
The 15-path 0-50V voltage input reference ground in the signal acquisition circuit is isolated from the digital ground and other reference grounds of the module; the 15-way 0-350V voltage input reference ground is isolated from the digital ground and other reference grounds of the module; the 15-way 0-200V voltage input reference ground is isolated from the digital ground and other reference grounds of the module; the 5 paths of current input conditioning circuits are isolated from each other and from other reference grounds; the circuit is digitally a digital circuit (FPGA, etc.) reference ground, isolated from other reference grounds.
The range and accuracy of signal acquisition may be: the direct current voltage is 0-50V, the step of the collection point is 1V, and the precision of the collection point is not lower than 0.5%; DC voltage of 0-350V, stepping the acquisition point by 10V, and the accuracy of the acquisition point is not lower than 0.5%; the alternating voltage is 0-200V, the step of the collection point is 10V, and the precision of the collection point is not lower than 0.5%; 0-5A DC current collection accuracy can reach 0.1% F.S.
The voltage signal conditioning circuit used in each voltage analog quantity IO module may be an operational amplifier conditioning circuit, and specifically, the voltage signal input in each path is divided by a precision resistor, then output to the reverse amplification circuit by the follower circuit, conditioned and converted into a voltage signal of 0 to 5V, and then output to the analog-to-digital converter for analog-to-digital conversion. The current signal conditioning circuit used in each current analog IO module can be an isolation sampling amplifying circuit, and the current sampling resistor adopts a high-precision resistor with the precision of +/-0.1%; the isolation amplifying circuit can be specifically an isolation operational amplifier AMC3301, the typical gain error of the isolation operational amplifier is 0.2% at most, the input of +/-250 mV is supported, the fixed gain is 8.2, the input offset voltage is 150uV at most, and the index requirement can be met. The current signals which are input into each voltage analog IO module and are isolated from each other are converted into small voltage signals through a high-precision sampling resistor, amplified by 8.2 times through an isolation operational amplifier AMC3301 and then output to an analog-to-digital converter for conversion from analog quantity to digital quantity.
The analog-to-digital converter can be realized by an analog-to-digital converter AD7606, wherein AD7606 is an 8-channel analog-to-digital converter, the resolution 16bit and the 5V single power supply power, and the low power consumption is 100mW.
As shown in fig. 3, the FPGA-based control circuit processes the voltage and current signals conditioned, analog-to-digital converted, and isolated by the analog IO circuit, and sends the processed signals to the upper computer through the ethernet port output circuit. The minimum system of the FPGA-based control circuit may specifically include: SOC (Zynq-7000), DDR2, nor Flash; this type of SOC includes 1\2 ARM Cortex-A9 processors (Programming System, PS, programmable System), and Kintex7 series of FPGAs (Programmable Logic, PL); the PS side has rich interfaces, and CAN extend UART (Universal Asynchronous Receiver/Transmitter), GPIO (General Purpose Input/Output), GMAC (Gigabit Media Access Control), CAN (Controller Area Network), SDIO (Secure Digital Input and Output), USB (Universal Serial Bus), and other peripherals, where PL and PS are interconnected by an AXI (Advanced eXtensible Interface) Bus, supporting high-speed data transmission; in order to run embedded linux, the Nor Flash capacity is not lower than 32 Mbytes, and the external DDR memory capacity is not lower than 64MB. The debugging serial port connected with the SOC chip can adopt RS232. The FPGA has the characteristics of multiple ports and programmable setting, can realize acquisition of multi-channel digital quantity signals, ensures high-precision digital signal processing, ensures small volume and low cost of a multi-channel signal acquisition circuit board, has flexible and changeable interfaces, and is convenient for installation and test of a system.
The power supply of the signal acquisition circuit can be 28V direct current input, and the voltage of direct current 5V, direct current 1.2V, direct current 2.5V and the like is output through the isolation power supply module to supply power to devices such as an operational amplifier, an analog-to-digital converter, an FPGA chip and the like in the signal acquisition circuit.
In the signal acquisition circuit of the embodiment, after the analog quantity IO circuit is used for carrying out signal conditioning, analog-to-digital conversion and isolation on the multi-path alternating voltage, the direct current voltage and the direct current signal, the multi-path alternating voltage, the direct current voltage and the direct current signal are transmitted to the control circuit based on the FPGA for processing and sending to the upper computer, high-precision and multi-channel acquisition of large voltage and large current is realized in a high-integration-level mode, and the whole circuit board is small in size, low in cost, flexible and variable in interface and convenient for installation and test of the system.
It should be noted that each circuit and module according to the present embodiment may be a single physical unit, may be a part of a single physical unit, or may be implemented by a combination of a plurality of physical units in an actual application. In addition, in order to highlight the innovative part of the present invention, elements that are not so closely related to solving the technical problems proposed by the present invention are not introduced in the present embodiment, but this does not indicate that other elements are not present in the present embodiment.
Another embodiment of the present invention relates to a signal acquisition method, including: receiving analog quantity signal input of alternating voltage, direct voltage and direct current of N paths; conditioning an input signal; the method comprises the steps of carrying out operational amplification conditioning on an input voltage signal, and carrying out isolation sampling amplification conditioning on an input current signal; converting the conditioned signal from an analog quantity to a digital quantity; the converted digital signals are isolated and then input into a control circuit based on an FPGA for processing; and sending the processed signal to an upper computer through an Ethernet port output circuit.
In the embodiment, after signal conditioning, analog-to-digital conversion and isolation are carried out on a plurality of paths of alternating voltage, direct voltage and direct current signals, the signals are transmitted to the control circuit based on the FPGA for processing and are sent to the upper computer, high-precision and multi-channel collection of large voltage and large current is realized in a high-integration mode, the whole circuit board is small in size, low in cost and flexible and variable in interface, and installation and test of the system are facilitated.
The steps of the above method are divided for clarity of description, and may be combined into one step or split some steps, and be decomposed into multiple steps, as long as the same logical relationship is included, all of which are within the protection scope of the present patent; it is within the scope of the patent to add insubstantial modifications to the methods or processes or to introduce design implications that do not alter the core design of the methods or processes.
It should be understood that this embodiment is a method example corresponding to the circuit embodiment described above, and that this embodiment can be implemented in cooperation with the circuit embodiment described above. The related technical details mentioned in the above circuit implementation are still valid in this implementation, and are not described herein again to reduce repetition. Accordingly, the related art details mentioned in the present embodiment can also be applied to the above circuit embodiment.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of practicing the invention, and that various changes in form and detail may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. A signal acquisition circuit is characterized by comprising an analog input/output (IO) circuit and a control circuit based on a Field Programmable Gate Array (FPGA); the analog quantity IO circuit is connected with the FPGA-based control circuit;
the analog quantity IO circuit is used for receiving analog quantity signal input of N paths of alternating voltage, direct voltage and direct current, carrying out operational amplification conditioning on an input voltage signal, carrying out isolation sampling amplification conditioning on an input current signal, carrying out analog quantity-to-digital quantity conversion on a conditioned signal, and inputting the converted digital signal to the FPGA-based control circuit after isolation;
the FPGA-based control circuit is used for processing the received digital signals and sending the processed signals to an upper computer.
2. The signal acquisition circuit of claim 1, wherein the analog IO circuit comprises: k voltage analog quantity IO modules and M current analog quantity IO modules;
the voltage analog IO module is respectively used for receiving analog quantity signal input of p paths of alternating current voltage or direct current voltage, carrying out operational amplification conditioning on the input voltage signal, carrying out analog quantity-to-digital quantity conversion on the signal after the operational amplification conditioning, and inputting the digital signal after the conversion into the FPGA-based control circuit after the digital signal is isolated;
the current analog quantity IO module is respectively used for receiving analog quantity signal input of q paths of direct current, carrying out isolation sampling, amplification and conditioning on the input current signal, carrying out analog quantity-to-digital quantity conversion on the signal subjected to isolation sampling, amplification and conditioning, and inputting the digital signal subjected to conversion into the FPGA-based control circuit after isolation; wherein K × p + M × q = N.
3. The signal acquisition circuit of claim 2 wherein the voltage input reference ground of each of the voltage analog IO modules is isolated from the digital ground and current input reference ground of the signal acquisition circuit;
in each current analog quantity IO module, the reference grounds of the current inputs of all paths are isolated from each other and from the voltage input reference ground.
4. The signal acquisition circuit of claim 2, wherein the voltage analog IO module comprises:
the operational amplifier conditioning circuit is used for performing operational amplifier conditioning on the input p paths of alternating voltage or direct voltage signals;
the analog-to-digital conversion circuit is connected with the operational amplifier conditioning circuit and is used for converting the signals after the operational amplifier conditioning from analog quantity to digital quantity;
and the digital isolator is connected with the analog-to-digital conversion circuit and used for inputting the converted digital signals into the FPGA-based control circuit.
5. The signal acquisition circuit of claim 4 wherein the operational amplifier conditioning circuit comprises a precision resistor, a follower circuit and a reverse amplifier circuit; the precision resistor is connected with the following circuit, and the following circuit is connected with the reverse amplification circuit;
the precision resistor is used for dividing the voltage signal input by each path of the operational amplifier conditioning circuit and outputting the divided voltage signal to the follower circuit;
the follower circuit is used for outputting the voltage signal after voltage division to the reverse amplification circuit, and is used for impedance matching and eliminating the influence between circuits connected with the follower circuit;
the reverse amplification circuit is used for converting the input voltage signal into a voltage signal with a preset range value.
6. The signal acquisition circuit of claim 3 wherein the current analog IO module comprises:
the isolation sampling amplifying circuit is used for carrying out isolation sampling amplification conditioning on an input q-path direct current signal;
the analog-to-digital conversion circuit is connected with the isolated sampling amplification circuit and is used for converting the signals subjected to isolated sampling amplification into digital quantity;
and the digital isolator is connected with the analog-to-digital conversion circuit and used for inputting the converted digital signals into the FPGA-based control circuit.
7. The circuit of claim 6, wherein the isolated sampling amplification circuit comprises a sampling resistor and an isolated amplification circuit; the sampling resistor is connected with the isolation amplifying circuit;
the sampling resistor is used for converting input current signals which are isolated from each other into voltage signals of a preset threshold value;
the isolation amplifying circuit is used for amplifying the voltage signal with the preset threshold value by a preset multiple.
8. The signal acquisition circuit of claim 1 wherein the FPGA-based control circuit comprises:
the SOC integrated chip is used for processing the output signal of the analog IO circuit and comprises an ARM processor and an FPGA;
DDR2 and NOR Flash connected with the SOC integrated chip, wherein the DDR2 and the NOR Flash are used for expanding the memory;
and the Ethernet port is connected with the SOC integrated chip and is used for signal data transmission between the FPGA-based control circuit and the upper computer.
9. The signal acquisition circuit of any one of claims 2-8 wherein the signal acquisition circuit further comprises: the power supply and K + M isolated power supplies;
the power supply is correspondingly connected with the voltage analog quantity IO module and the current analog quantity IO module in the analog quantity IO circuit through each isolation power supply;
the power supply is used for supplying power for the analog IO circuit and the FPGA-based control circuit through the isolation power supply.
10. A signal acquisition method for use in a signal acquisition circuit as claimed in any one of claims 1 to 9, the steps of the signal acquisition method comprising:
receiving analog quantity signal input of alternating voltage, direct voltage and direct current of N paths;
conditioning an input signal; the method comprises the following steps that input voltage signals are subjected to operational amplification conditioning, and input current signals are subjected to isolation sampling amplification conditioning;
converting the conditioned signal from an analog quantity to a digital quantity;
the converted digital signals are isolated and then input into a control circuit based on an FPGA for processing;
and sending the processed signal to an upper computer.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116009447A (en) * | 2022-12-30 | 2023-04-25 | 中国科学院空间应用工程与技术中心 | Acquisition control circuit board for space standing on-line cabinet |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116009447A (en) * | 2022-12-30 | 2023-04-25 | 中国科学院空间应用工程与技术中心 | Acquisition control circuit board for space standing on-line cabinet |
| CN116009447B (en) * | 2022-12-30 | 2023-08-04 | 中国科学院空间应用工程与技术中心 | Acquisition control circuit board for space standing on-line cabinet |
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