Digital quantity signal acquisition device

Abstract

The utility model provides a digital quantity signal acquisition device, which comprises a filtering protection circuit, an overvoltage, undervoltage and overcurrent protection circuit, a plurality of same signal acquisition circuits and a processing circuit, the filtering protection circuit is used for filtering and protecting an input voltage signal; the overvoltage, undervoltage and overcurrent protection circuit is connected with the filtering protection circuit and is used for performing overvoltage, undervoltage and overcurrent processing on the filtered and protected voltage signal; the signal acquisition circuit is connected with the overvoltage and overcurrent protection circuit and is used for carrying out voltage division and isolation processing on the voltage signal after overvoltage and overcurrent processing and then carrying out acquisition; and the processing circuit is connected with each signal acquisition circuit and is used for comparing the acquisition signals acquired by each signal acquisition circuit and outputting digital quantity signals when the acquisition signals are consistent. The digital quantity signal acquisition device can effectively improve the acquisition precision and anti-interference capability of digital quantity signals, and meets the requirements of different application scenes.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a digital signal acquisition device. Background Art

[0002] Digital signal control is widely used in the automation field of industry and intelligent industry. Therefore, the accuracy of digital signal acquisition is related to the overall reliability of the operation of the automation control system.

[0003] However, the digital signal acquisition devices in the prior art have insufficient precision control and anti-interference capabilities and cannot meet the needs of practical applications. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a digital signal acquisition device that can effectively improve the acquisition accuracy and anti-interference ability of digital signals and meet the needs of different application scenarios.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the present invention provides a digital signal acquisition device, including a filtering protection circuit, an overvoltage, undervoltage and overcurrent protection circuit, multiple identical signal acquisition circuits and processing circuits; the filtering protection circuit is used to filter and protect the input voltage signal; the overvoltage, undervoltage and overcurrent protection circuit is connected to the filtering protection circuit, and is used to perform overvoltage, undervoltage and overcurrent processing on the filtered and protected voltage signal; the signal acquisition circuit is connected to the overvoltage and overcurrent protection circuit, and is used to divide and isolate the voltage signal after overvoltage and overcurrent processing for collection; the processing circuit is connected to each signal acquisition circuit, and is used to compare the acquisition signals obtained by each signal acquisition circuit, and output a digital signal when the acquisition signals are consistent.

[0006] In one embodiment of the present invention, the filtering protection circuit includes a fuse, a TVS tube, a diode and an RC filtering module connected in sequence.

[0007] In one embodiment of the present invention, the overvoltage, undervoltage and overcurrent protection circuit uses an overvoltage and overcurrent protection chip.

[0008] In one embodiment of the present invention, the signal acquisition circuit includes a voltage divider circuit, an isolation circuit and an acquisition circuit; the voltage divider circuit is used to divide the voltage signal after the overvoltage and overcurrent processing to obtain a voltage divider signal; the isolation circuit is used to isolate the voltage divider signal to obtain an isolated voltage; and the acquisition circuit is used to acquire the isolated voltage.

[0009] In one embodiment of the present invention, the voltage divider circuit includes two resistors connected in series to the voltage signal, and a voltage signal at a connection point of the two resistors in series serves as the voltage divider signal.

[0010] In an embodiment of the present invention, the isolation circuit uses an optocoupler isolator.

[0011] In one embodiment of the present invention, the processing circuit is a single chip microcomputer or a DSP.

[0012] In an embodiment of the present invention, the processing circuit is further configured to output an alarm message when the collected signals are inconsistent.

[0013] In one embodiment of the present invention, an indication circuit is further included, which is connected to the processing circuit and is used to output alarm information according to the comparison result.

[0014] In one embodiment of the present invention, the indication circuit includes an LED light and a host computer, the LED light is used to display the alarm information, and the host computer is used to monitor the alarm information.

[0015] As described above, the digital signal acquisition device of the present invention has the following beneficial effects:

[0016] (1) The accuracy of digital acquisition is effectively improved by performing multi-channel redundant acquisition of the same signal, and the anti-interference ability of digital acquisition is improved through overvoltage and overcurrent protection;

[0017] (2) It can quickly and efficiently detect input faults and promptly issue alarms and indications, thus realizing input self-diagnosis function;

[0018] (3) Applicable to a variety of application scenarios and highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shown is a schematic diagram of the framework of a digital signal acquisition device according to an embodiment of the present invention;

[0020] Figure 2 Shown is a schematic diagram of an application of an overvoltage and overcurrent protection chip of the present invention in one embodiment;

[0021] Figure 3 Shown is a schematic structural diagram of a signal acquisition circuit according to an embodiment of the present invention;

[0022] Figure 4 Shown is a schematic diagram of the framework of the digital signal acquisition device of the present invention in another embodiment. DETAILED DESCRIPTION

[0023] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0024] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology, and are not used to limit the conditions for implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose of the present invention. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should also be considered as the scope of implementation of the present invention without substantially changing the technical content.

[0025] The digital signal acquisition device of the utility model can effectively improve the acquisition accuracy and anti-interference ability of digital signals through redundant digital signal acquisition channels and overcurrent and overvoltage protection, meeting the needs of different application scenarios.

[0026] like Figure 1 As shown, in one embodiment, the digital signal acquisition device of the present invention includes a filtering protection circuit 1, an overvoltage, undervoltage and overcurrent protection circuit 2, multiple identical signal acquisition circuits 3 and a processing circuit 4.

[0027] The filtering and protection circuit 1 is used to filter and protect the input voltage signal. In one embodiment, the filtering and protection circuit includes a fuse, a TVS tube, a diode and an RC filter module connected in sequence. The input end of the fuse is connected to the positive input end of the voltage signal; the input end of the TVS tube is connected to the output end of the fuse, and the output end is connected to the negative input end of the voltage signal; the input end of the diode is connected to the output end of the fuse; the input end of the filtering module is connected to the output end of the diode and the output end of the TVS tube. Among them, the fuse is used to prevent circuit damage caused by excessive load current. The TVS tube has surge protection capability, thereby realizing surge protection function. The diode is used to realize anti-reverse insertion function. The RC filter module is used to filter out noise.

[0028] The overvoltage, undervoltage and overcurrent protection circuit 2 is connected to the filter protection circuit 1 and is used to process overvoltage, undervoltage and overcurrent of the filtered and protected voltage signal. In one embodiment, the overvoltage, undervoltage and overcurrent protection circuit uses an overvoltage and overcurrent protection chip to protect the acquisition channel and prevent the module from being damaged by high voltage and high current caused by erroneous operation on site. It can also filter out abnormal undervoltage signals to prevent erroneous operation caused by erroneous acquisition signals. Figure 2 As shown, for the overvoltage and undervoltage protection chip shown, appropriate resistors are used to set the overvoltage, undervoltage, and current limit thresholds within reasonable ranges. Undervoltage, overvoltage, and overcurrent protection are implemented by configuring R100 / R102 / 105 / 106 / 108. When the collected signal exceeds the voltage or current range, the MOS transistor shuts down, preventing the signal from being transmitted backward, thereby improving the overall system's anti-interference capability.

[0029] The signal acquisition circuit 3 is connected to the overvoltage and overcurrent protection circuit 2, and is used to divide and isolate the voltage signal after the overvoltage and overcurrent processing and then collect it. Specifically, the signal acquisition circuit 3 divides the collected voltage signal through a resistor, and the obtained divided voltage signal is collected after isolation processing. In one embodiment, the signal acquisition circuit includes a voltage divider circuit, an isolation circuit and an acquisition circuit; the voltage divider circuit is used to divide the voltage signal after the overvoltage and overcurrent processing and obtain a divided voltage signal; the isolation circuit is used to isolate the divided voltage signal and obtain an isolated voltage; and the acquisition circuit is used to collect the isolated voltage. The voltage divider circuit includes two resistors connected in series to the voltage signal, and the voltage signal at the connection point of the two resistors in series is used as the divided voltage signal. The isolation circuit uses an optocoupler isolator. The processing circuit uses a single-chip microcomputer or a DSP.

[0030] In the present invention, multi-channel acquisition of digital signals is achieved by setting up a multi-channel redundant signal acquisition circuit. By comparing the collected signals to see if they are consistent, input faults can be quickly and efficiently discovered and timely alarms and indications can be given, thus realizing the self-diagnosis function of the input and improving the acquisition accuracy. Figure 3 As shown, two signal acquisition circuits are used to collect the same voltage signal. The ratios of R1 to R3, and R4 to R6, are identical, so the input voltages of the two optocouplers are theoretically identical. IN1 and IN1' represent the results of redundant acquisition of one signal, which are then passed to the subsequent processing circuit 4.

[0031] The processing circuit 4 is connected to each signal acquisition circuit 3 and is used to compare the acquisition signals obtained by each signal acquisition circuit and output a digital signal when the acquisition signals are consistent, and output an alarm message when the acquisition signals are inconsistent.

[0032] like Figure 4 As shown, in this embodiment, the digital signal acquisition device of the present invention further includes an indicator circuit 5. The indicator circuit 5 is connected to the processing circuit 4 and is configured to output an alarm message based on the comparison result. Preferably, the indicator circuit includes an LED light and a host computer. The LED light is configured to display the alarm message, and the host computer is configured to monitor the alarm message, thereby enabling faster and more efficient detection and timely processing of input anomalies. The processing circuit states and alarm states corresponding to different acquisition signals are shown in Table 1.

[0033] Table 1. Processing circuit status and alarm status corresponding to different acquisition signals

[0034] IN1 IN1' Processing circuit status Alarm status H H Consistent, no signal LED off, no alarm L L Consistent, with signal LED is on, no alarm H L Inconsistency, alarm LED flashes, alarm L H Inconsistency, alarm LED flashes, alarm

[0035] It should be noted that while the digital signal acquisition device of this utility model can theoretically replicate an unlimited number of collected signals, this is actually limited by the number of I / O ports on the microcontroller / DSP. In practical applications, the number of controlled channels can be appropriately set based on the number of microcontrollers / DSPs and control devices used. If necessary, channel expansion circuits can be added to enable acquisition of more channels.

[0036] In summary, the digital signal acquisition device of the present invention effectively improves the accuracy of digital acquisition by performing multi-channel redundant acquisition of the same signal, and enhances its anti-interference capability through overvoltage and overcurrent protection. It can quickly and efficiently detect input faults and promptly issue alarms and indications, thus implementing input self-diagnosis. It is suitable for a variety of application scenarios and is highly practical. Therefore, the present invention effectively overcomes the various shortcomings of the existing technology and possesses high industrial value.

[0037] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A digital signal acquisition device, characterized in that: Including filtering protection circuit, overvoltage, undervoltage and overcurrent protection circuit, multi-channel identical signal acquisition circuit and processing circuit; The filtering and protection circuit is used to filter and protect the input voltage signal; The overvoltage, undervoltage and overcurrent protection circuit is connected to the filtering protection circuit and is used to perform overvoltage, undervoltage and overcurrent processing on the filtered and protected voltage signal; The signal acquisition circuit is connected to the overvoltage, undervoltage and overcurrent protection circuit, and is used to divide and isolate the voltage signal after the overvoltage and overcurrent processing and then collect it; The processing circuit is connected to each signal acquisition circuit, and is used to compare the acquisition signals obtained by each signal acquisition circuit, and output a digital signal when the acquisition signals are consistent.

2. The digital signal acquisition device according to claim 1, characterized in that: The filtering protection circuit includes a fuse, a TVS tube, a diode and an RC filtering module which are connected in sequence.

3. The digital signal acquisition device according to claim 1, wherein: The overvoltage, undervoltage and overcurrent protection circuit adopts an overvoltage and overcurrent protection chip.

4. The digital signal acquisition device according to claim 1, wherein: The signal acquisition circuit includes a voltage divider circuit, an isolation circuit and an acquisition circuit; the voltage divider circuit is used to divide the voltage signal after the overvoltage and overcurrent processing to obtain a divided voltage signal; the isolation circuit is used to isolate the divided voltage signal to obtain an isolated voltage; The acquisition circuit is used to acquire the isolation voltage.

5. The digital signal acquisition device according to claim 4, characterized in that: The voltage divider circuit includes two resistors connected in series to the voltage signal, and a voltage signal at a connection point of the two resistors in series serves as the voltage divider signal.

6. The digital signal acquisition device according to claim 4, characterized in that: The isolation circuit adopts an optocoupler isolator.

7. The digital signal acquisition device according to claim 1, characterized in that: The processing circuit adopts a single chip microcomputer or a DSP.

8. The digital signal acquisition device according to claim 1, wherein: The processing circuit is further configured to output an alarm message when the collected signals are inconsistent.

9. The digital signal acquisition device according to claim 1, characterized in that: It also includes an indication circuit connected to the processing circuit, which is used to output alarm information according to the comparison result of the processing circuit.

10. The digital signal acquisition device according to claim 9, characterized in that: The indicating circuit includes an LED lamp and a host computer, the LED lamp is used to display the alarm information, and the host computer is used to monitor the alarm information.

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