Multi-channel isolation type current and voltage signal processing board card

Abstract

The utility model discloses a multichannel isolation type current and voltage signal processing board card comprising a board card main body, and the board card main body is provided with a plurality of signal input channels, a signal isolation module, a signal processing module, a microprocessor and a signal output interface. Each signal input channel comprises a current input port and a voltage input port, an isolation unit of the signal isolation module comprises a current isolation circuit and a voltage isolation circuit, and isolation input of multichannel signals is achieved. The signal processing module carries out amplification, analog-to-digital conversion and filtering processing on the isolated signals, the microprocessor carries out operation processing on the signals, and the signal output interface outputs the processed signals. According to the utility model, inter-channel signal interference and external electromagnetic interference are effectively prevented, the signal acquisition precision and the anti-interference capability of the board card are improved, and the connection requirements of various devices are met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of electronic circuit, concretely relates to a multi -channel isolated type current voltage signal processing board card. BACKGROUND

[0002] In the field of industrial automation control, power monitoring, instruments and meters, etc., it is often necessary to collect, process and transmit current and voltage signals. The traditional signal processing board card has the problems of poor signal isolation effect, weak anti-interference ability, etc., which can easily lead to signal distortion and inaccurate data collection, affecting the normal operation of the system. In addition, the existing signal processing board card often has a limited number of channels, which is difficult to meet the demand of processing multiple current and voltage signals at the same time, and lacks effective protection measures in the signal processing process. When overcurrent, overvoltage and other abnormal conditions occur, the board card is easily damaged, reducing the reliability and stability of the equipment. UTILITY MODEL CONTENTS

[0003] In order to solve the above problems, the utility model provides a multi -channel isolated type current voltage signal processing board card to solve the problems of poor signal isolation effect, weak anti-interference ability, limited number of channels and lack of effective protection measures in the prior art.

[0004] The technical scheme of the utility model is as follows: a multi -channel isolated type current voltage signal processing board card, comprising a board card main body, a plurality of signal input channels, a signal isolation module, a signal processing module, a microprocessor and a signal output interface are arranged on the board card main body.

[0005] Each signal input channel comprises a current input port and a voltage input port, the current input port is used for receiving external current signal, and the voltage input port is used for receiving external voltage signal.

[0006] The signal isolation module comprises a plurality of isolation units, each isolation unit corresponds to a signal input channel, and the isolation unit comprises a current isolation circuit and a voltage isolation circuit. The current isolation circuit is connected with the corresponding current input port and is used for isolating and processing the current signal, and the current isolation circuit comprises a current transformer, one side of the current transformer is connected with the current input port, and the other side outputs the isolated current signal; the voltage isolation circuit is connected with the corresponding voltage input port and is used for isolating and processing the voltage signal, and the voltage isolation circuit comprises a voltage transformer, one side of the voltage transformer is connected with the voltage input port, and the other side outputs the isolated voltage signal.

[0007] The signal processing module includes multiple signal processing units, each corresponding to a signal input channel. Each signal processing unit is connected to a corresponding isolation unit for processing isolated current and voltage signals. Each signal processing unit includes a signal amplification circuit, an analog-to-digital converter circuit, and a filtering circuit. The input of the signal amplification circuit is connected to the output of the isolation unit for amplifying the isolated signal. The input of the analog-to-digital converter circuit is connected to the output of the signal amplification circuit for converting the analog signal into a digital signal. The input of the filtering circuit is connected to the output of the analog-to-digital converter circuit for filtering the digital signal.

[0008] The microprocessor is connected to the signal processing module and is used to receive the processed digital signal and perform calculations, analysis and processing on the digital signal.

[0009] The signal output interface is connected to the microprocessor and is used to output the processed signal to an external device. Furthermore, the main body of the board also includes a power module, which includes an isolated power supply. This isolated power supply provides isolated power to the signal isolation module, the signal processing module, and the microprocessor, preventing power interference from affecting signal processing.

[0010] Furthermore, the signal amplification circuit employs a programmable gain amplifier, the gain of which can be adjusted by a microprocessor to accommodate input signals of different amplitudes.

[0011] Furthermore, the filtering circuit employs a digital filter, and the filtering parameters of the digital filter can be set by a microprocessor to achieve different filtering effects.

[0012] Furthermore, the signal output interface includes a USB interface, an RS-485 interface, and an Ethernet interface to meet the connection needs of different external devices.

[0013] The beneficial effects of this invention are as follows: By setting multiple signal input channels and corresponding isolation units, this invention achieves isolated input of multi-channel current and voltage signals, effectively preventing signal interference between channels and the influence of external electromagnetic interference on the signal; the signal processing module amplifies, converts analog to digital, and filters the isolated signal, improving the signal acquisition accuracy and stability; the microprocessor performs calculations and processing on the signal, realizing intelligent signal processing; and the multiple signal output interfaces facilitate connection and communication with external devices. Simultaneously, the isolated power supply further enhances the board's anti-interference capability, ensuring stable operation of the board. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a structural block diagram of Example 1.

[0016] Figure 2 This is a block diagram of the signal processing unit.

[0017] Figure 3 This is a structural block diagram of Example 2. Detailed Implementation

[0018] The technical solution of this utility model will be clearly and completely described below through specific embodiments.

[0019] Example 1

[0020] refer to Figure 1 and Figure 2 This utility model relates to a multi-channel isolated current and voltage signal processing board, which includes a board body 1. The board body 1 is provided with multiple signal input channels 2, a signal isolation module, a signal processing module, a microprocessor 5, and a signal output interface 6.

[0021] Each of the signal input channels 2 includes a current input port 21 and a voltage input port 22; the current input port 21 is used to receive external current signals, and the voltage input port 22 is used to receive external voltage signals.

[0022] The signal isolation module includes multiple isolation units 31, each isolation unit 31 corresponding to a signal input channel 2; the isolation unit 31 includes a current isolation circuit 311 and a voltage isolation circuit 312.

[0023] A current isolation circuit 311 is connected to the corresponding current input port 21 to isolate the current signal. The current isolation circuit 311 includes a current transformer (such as a LEM LA55-P). The primary side of the current transformer is connected to the current input port 21, and the secondary side outputs the isolated current signal. Preferably, a varistor (such as an MOV) and a resettable fuse are connected in parallel on the secondary side to prevent abnormal overvoltage from damaging subsequent circuits. The secondary side signal is converted into a voltage signal by a differential circuit (such as an operational amplifier) ​​and output to the signal processing module.

[0024] The voltage isolation circuit 312 is connected to the corresponding voltage input port 22 and is used to isolate the voltage signal. The voltage isolation circuit 312 includes a voltage transformer (such as VITROHM PT-100). The primary side of the voltage transformer is connected to the voltage input port 22, and the secondary side outputs the isolated voltage signal. The secondary side uses a resistor divider network (such as R1 and R2) to reduce the high voltage to a range suitable for signal processing, and a small capacitance capacitor (such as 10μF) is connected in parallel to filter out high-frequency noise.

[0025] The signal processing module includes multiple signal processing units 41, each signal processing unit 41 corresponding to a signal input channel 2. The signal processing unit 41 is connected to the corresponding isolation unit 31 and is used to process the isolated current signal and voltage signal.

[0026] The signal processing unit 41 in this embodiment includes a signal amplification circuit 411, an analog-to-digital conversion circuit 412, and a filtering circuit 413.

[0027] The input terminal of the signal amplification circuit 411 is connected to the output terminal of the isolation unit 31 to amplify the isolated signal; the input terminal of the analog-to-digital converter circuit 412 is connected to the output terminal of the signal amplification circuit 411 to convert the analog signal into a digital signal; and the input terminal of the filter circuit 413 is connected to the output terminal of the analog-to-digital converter circuit 412 to filter the digital signal.

[0028] In this embodiment, the signal amplification circuit 411 uses a programmable gain amplifier (such as Microchip's MCP6G0X series). The gain of the programmable gain amplifier U1 is adjusted by the microprocessor 5 to adapt to input signals of different amplitudes.

[0029] The filtering circuit 413 in this embodiment uses a digital filter (such as an FIR digital filter). The filtering parameters of the digital filter are set by the microprocessor 5 to achieve different filtering effects.

[0030] The microprocessor 5 (STM32H750VBH6) is connected to the signal processing module; the signal output interface 6 is connected to the microprocessor 5.

[0031] The signal output interface 6 in this embodiment includes a USB interface 61, an RS-485 interface 62, and an Ethernet interface 63.

[0032] External current and voltage signals enter the corresponding signal input channels 2 through current input port 21 and voltage input port 22, respectively. After isolation processing by current transformers and voltage transformers, isolated current and voltage signals are obtained. The isolated signals enter the signal processing unit 41, where they are first amplified by a programmable gain amplifier. The amplified analog signal is then converted into a digital signal by an analog-to-digital converter circuit 412, and then filtered by a digital filter to obtain a clean digital signal. The microprocessor 5 receives the processed digital signal, performs calculations, analysis, and processing, and finally outputs the processed signal to an external device through the signal output interface 6.

[0033] Example 2

[0034] like Figure 3 As shown, in this embodiment, based on Embodiment 1, a power module is further provided on the main body 1 of the board; the power module includes an isolation power supply 71; the isolation power supply 71 is used to provide isolated power to the signal isolation module, the signal processing module, and the microprocessor 5. The isolation power supply 71 provides isolated power to each module, ensuring the stable operation of the board. A DC-DC isolation module can be used to provide an independent power supply to each isolation unit, ensuring no interference between the power supplies of each channel.

[0035] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Those skilled in the art can make various modifications or equivalent substitutions to the present utility model within its substance and protection scope, and such modifications or equivalent substitutions should also be considered to fall within the protection scope of the present utility model's technical solution.

Claims

1. A multi-channel isolated current-voltage signal processing board card comprising a board card main body (1), characterized in that: The board card body (1) is provided with a plurality of signal input channels (2), a signal isolation module, a signal processing module, a microprocessor (5) and a signal output interface (6); Each of the signal input channels (2) comprises a current input port (21) and a voltage input port (22); The signal isolation module comprises a plurality of isolation units (31), each isolation unit (31) corresponding to a signal input channel (2); the isolation unit (31) comprises a current isolation circuit (311) and a voltage isolation circuit (312); the current isolation circuit (311) is connected with the corresponding current input port (21); the voltage isolation circuit (312) is connected with the corresponding voltage input port (22); The signal processing module comprises a plurality of signal processing units (41), each signal processing unit (41) corresponding to a signal input channel (2), and the signal processing unit (41) is connected with the corresponding isolation unit (31); The microprocessor (5) is connected with the signal processing module; and the signal output interface (6) is connected with the microprocessor (5).

2. The multi-channel isolated current-voltage signal processing board card of claim 1, wherein: The board card body (1) is further provided with a power module; the power module comprises an isolation power supply (71); the isolation power supply (71) is used for providing an isolation power supply for the signal isolation module, the signal processing module and the microprocessor (5).

3. The multi-channel isolated current-voltage signal processing board card of claim 1, wherein: The current isolation circuit (311) comprises a current transformer, and the primary side of the current transformer is connected with the current input port (21), and the secondary side outputs an isolated current signal.

4. The multi-channel isolated current-voltage signal processing board card of claim 1, wherein: The voltage isolation circuit (312) comprises a voltage transformer, and the primary side of the voltage transformer is connected with the voltage input port (22), and the secondary side outputs an isolated voltage signal.

5. The multi-channel isolated current-voltage signal processing board card of claim 1, wherein: The signal processing unit (41) comprises a signal amplification circuit (411), an analog-digital conversion circuit (412) and a filter circuit (413); the input end of the signal amplification circuit (411) is connected with the output end of the isolation unit (31); the input end of the analog-digital conversion circuit (412) is connected with the output end of the signal amplification circuit (411); and the input end of the filter circuit (413) is connected with the output end of the analog-digital conversion circuit (412).

6. The multi-channel isolated current-voltage signal processing board card of claim 5, wherein: The signal amplification circuit (411) adopts a programmable gain amplifier.

7. The multi-channel isolated current-voltage signal processing board card of claim 5, wherein: The filter circuit (413) adopts a digital filter.

8. The multi-channel isolated current-voltage signal processing board card of claim 1, wherein: The signal output interface (6) comprises a USB interface (61), an RS-485 interface (62) and an Ethernet interface (63).

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