CN211086439U - Signal sampling board - Google Patents
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- CN211086439U CN211086439U CN201921900419.7U CN201921900419U CN211086439U CN 211086439 U CN211086439 U CN 211086439U CN 201921900419 U CN201921900419 U CN 201921900419U CN 211086439 U CN211086439 U CN 211086439U
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Abstract
The utility model provides a signal sampling board, include: the BNC interface and the voltage-current switching module; the BNC interface is used for receiving a sampling signal; this BNC interface is connected to this voltage current switching module for when this sampling signal is voltage signal with the mode switch of this signal sampling board to voltage sampling mode, when this sampling signal is current signal with the mode switch of this signal sampling board to current sampling mode, wherein, through setting up voltage current switching module and BNC interface, can directly gather the direct current voltage or the current signal of equipment transmission such as access field voltage divider, can not increase the hardware cost, coaxial cable interference killing feature is strong, fasten advantages such as target in place, the flexibility is good, compatibility is strong.
Description
Technical Field
The utility model relates to an electric power field especially relates to a signal sampling board.
Background
The data acquisition and processing are important components of the control protection of the power system, and the control protection equipment needs a signal sampling board to convert an external analog signal into a digital quantity for the control protection equipment to perform the control protection.
However, the conventional sampling board is generally a two-wire interface, and for devices such as a voltage divider that use a BNC (bayonet nutconnector) interface coaxial cable to transmit signals, the devices cannot be directly connected, and a BNC interface conversion device needs to be used or a BNC connector needs to be cut off, so that the coaxial cable is separated into two groups of wires, which increases hardware cost or loses the advantages of strong anti-interference capability, in-place fastening and the like of the coaxial cable.
In addition, the existing sampling plate has single function, is only suitable for voltage signals or current signals, and has poor compatibility.
SUMMERY OF THE UTILITY MODEL
To the problem among the prior art, the utility model provides a signal sampling board can solve the problem that exists among the prior art at least partially.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a signal sampling plate comprising: the BNC interface and the voltage-current switching module;
the BNC interface is used for receiving a sampling signal;
the voltage-current switching module is connected with the BNC interface and is used for switching the working mode of the signal sampling plate to a voltage sampling mode when the sampling signal is a voltage signal and switching the working mode of the signal sampling plate to a current sampling mode when the sampling signal is a current signal.
Further, the signal sampling board further includes: a signal conditioning module;
the signal conditioning module is connected to the output end of the voltage-current switching module and is used for conditioning the sampling signal.
Further, the signal conditioning module comprises: the circuit comprises an isolation amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor and an operational amplifier;
the positive phase input end of the isolation amplifier is connected with the output end of the voltage-current switching module, the negative phase input end, the input public end and the output public end are all grounded, and the input power end and the output power end are connected with a power supply; the positive phase output end is connected with one end of the first resistor, and the negative phase output end is connected with one end of the second resistor;
one end of the first capacitor is connected with the input common end, and the other end of the first capacitor is connected with a power supply; one end of the second capacitor is connected with the output common end, and the other end of the second capacitor is connected with a power supply;
the other end of the first resistor is connected with one end of a third resistor, one end of a fourth resistor and one end of a third capacitor; the other end of the second resistor is connected with the other end of the third capacitor, one end of the fifth resistor and one end of the sixth resistor; the other end of the sixth resistor is grounded, the other end of the third resistor is connected with one end of the fourth capacitor and the output end of the operational amplifier, the other end of the fourth resistor is connected with the other end of the fourth capacitor and the inverting input end of the operational amplifier, the other end of the fifth resistor is connected with one end of the fifth capacitor and the non-inverting input end of the operational amplifier, and the other end of the fifth capacitor is grounded; the output end of the operational amplifier is connected with one end of a seventh resistor, the other end of the seventh resistor is used as the output end of the signal conditioning module, positive and negative power supply ends of the operational amplifier are both connected with a power supply, one end of the sixth capacitor is connected with the positive power supply end of the operational amplifier, and the other end of the sixth capacitor is grounded; one end of the seventh capacitor is connected with the other end of the sixth capacitor, and the other end of the seventh capacitor is connected with a power supply.
Further, the voltage-current switching module includes: the circuit comprises a diode, a first inductor, a second inductor, a third inductor, a variable resistor, an eighth capacitor and a mode selector switch;
the diode is connected in parallel to the BNC interface; one end of the first inductor is connected with one end of the diode, and the other end of the first inductor is connected with one end of the second inductor, one end of the third inductor and one end of the eighth resistor; one end of the variable resistor is connected with the other end of the diode, the other end of the variable resistor is grounded, and the other end of the second inductor, the other end of the third inductor and one end of the eighth capacitor are grounded; the other end of the eighth resistor is connected with the other end of the eighth capacitor and is connected with the positive phase input end of the isolation amplifier; the mode switch is connected in parallel to two sides of the first inductor.
Further, the signal sampling board further includes: an analog-to-digital conversion module;
the analog-to-digital conversion module is connected with the output end of the signal conditioning module and is used for converting the conditioned sampling signal into a digital signal.
Further, the signal sampling board further includes: a data processing module;
the data processing module is connected with the output end of the analog-to-digital conversion module and is used for filtering and extracting harmonic waves of the digital signal.
Further, the data processing module is an FPGA.
Further, the signal sampling board further includes: a communication output module;
the communication output module is connected with the output end of the data processing module and is used for outputting the processed digital signals to external equipment.
Further, the communication output module is a serial backplane.
Furthermore, the BNC interface, the voltage-current switching module, and the signal conditioning module are all plural.
The utility model provides a signal sampling board, include: the BNC interface and the voltage-current switching module; the BNC interface is used for receiving a sampling signal; the voltage and current switching module is connected with the BNC interface and is used for switching the working mode of the signal sampling plate to a voltage sampling mode when the sampling signal is a voltage signal and switching the working mode of the signal sampling plate to a current sampling mode when the sampling signal is a current signal, wherein the voltage and current switching module and the BNC interface are arranged to directly collect and access direct current voltage or current signals transmitted by equipment such as a field voltage divider.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. In the drawings:
fig. 1 is a block diagram of a signal sampling board according to an embodiment of the present invention;
fig. 2 is a block diagram of a signal sampling plate according to another embodiment of the present invention;
fig. 3 shows a circuit diagram of the voltage-current switching module 20 and the signal conditioning module 30 in fig. 1 or fig. 2;
fig. 4 shows a working principle diagram of the signal sampling plate of the present invention.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The detailed features and advantages of the present invention are described in detail in the following embodiments, which are sufficient for anyone skilled in the art to understand the technical content of the present invention and to implement the present invention, and the related objects and advantages of the present invention can be easily understood by anyone skilled in the art according to the disclosure of the present specification, the claims and the drawings. The following examples further illustrate the aspects of the present invention in detail, but do not limit the scope of the present invention in any way.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The existing sampling plate is generally a two-wire interface, and equipment such as a voltage divider and the like which uses a BNC interface coaxial cable to transmit signals cannot be directly connected, a BNC interface conversion device needs to be used or a BNC connector needs to be cut off, and the coaxial cable is stripped into two groups of wires, so that the hardware cost is increased or the advantages of the coaxial cable, such as strong anti-interference capability, in-place fastening and the like, are lost. In addition, the existing sampling plate has single function, is only suitable for voltage signals or current signals, and has poor compatibility.
For the above-mentioned technical problem who exists among the at least partial solution prior art, the embodiment of the utility model provides a signal sampling board through setting up voltage electric current switching module and BNC interface, can directly gather direct voltage or the current signal that inserts equipment transmissions such as on-the-spot voltage divider, can not increase the hardware cost, has kept advantages such as coaxial cable interference killing feature is strong, the fastening targets in place, and the flexibility is good, and is compatible strong.
Fig. 1 is a block diagram of a signal sampling board according to an embodiment of the present invention. As shown in fig. 1, the signal sampling plate may include: BNC interface 10, voltage-current switching module 20, signal conditioning module 30, analog-to-digital conversion module 40, data processing module 50, and communication output module 60.
Wherein, the BNC interface 10 is used as an input terminal of the signal sampling board, and is used for receiving a sampling signal of a voltage divider and the like. In particular, the sampling signal may be a voltage signal or a current signal.
The voltage-current switching module 20 is connected to the BNC interface 10 for switching the operation mode of the signal sampling board.
Specifically, the voltage-current switching module 20 is configured to switch the operating mode of the signal sampling board to a voltage sampling mode when the sampling signal is a voltage signal, switch the operating mode of the signal sampling board to a current sampling mode when the sampling signal is a current signal, and transmit the sampling signal to the signal conditioning module 30.
The signal conditioning module 30 is connected to the output end of the voltage-current switching module 20, and is configured to condition the sampling signal.
The analog-to-digital conversion module 40 is connected to the output end of the signal conditioning module 30, and is configured to convert the conditioned sampling signal into a digital signal.
The data processing module 50 is connected to the output end of the analog-to-digital conversion module 40, and is used for performing processing such as filtering and harmonic extraction on the digital signal.
The communication output module 60 is connected to the output end of the data processing module 50, and is used for outputting the processed digital signal to an external device.
Wherein, through setting up voltage and current switching module and BNC interface, can directly gather the direct current voltage signal that equipment transmission such as access on-the-spot voltage divider, and the sampling board disposes voltage and current switching module, can insert direct current signal through simple setting, simple structure, the flexibility is good, strong adaptability can not increase the hardware cost, has kept advantages such as coaxial cable interference killing feature is strong, the fastening targets in place, and the compatibility is strong.
Fig. 2 is a block diagram of a signal sampling plate according to another embodiment of the present invention; as shown in fig. 2, there are 9 sets of acquisition sections of the sampling plate (i.e., BNC interface 10, voltage-to-current switching module 20, and signal conditioning module 30), wherein each set of acquisition sections includes BNC interface 10, voltage-to-current switching module 20, and signal conditioning module 30; the BNC interface 10 is connected with the voltage-current switching module 20, the voltage-current switching module 20 is connected with the signal conditioning module 30, and the signal conditioning module 30 is connected with the analog-to-digital conversion module 40, and is sent to the control system for use through the communication output module 60 after passing through the data processing module 50.
According to the conversion of the voltage and current switching module, a 5V voltage signal or a 4-20 mA current signal can be directly acquired.
In an optional embodiment, the data processing module may adopt an FPGA chip for implementing functions of data acquisition, filtering, harmonic extraction, communication output, and the like.
The FPGA chip is adopted to realize data processing, so that the cost can be effectively reduced, and the efficiency is improved.
In an alternative embodiment, the communication output module is a serial backplane.
The serial backboard is used as communication output, so that the instruction of the output signal can be effectively improved, and the flexibility and the compatibility of use can be effectively improved.
It is worth to be noted that, the BNC interface is used for receiving a direct current signal sent back by the field device, if the collected signal is a direct current voltage signal, the voltage and current switching module selects the resistor to be used, the voltage collection mode is started, the voltage signal is conditioned by the signal conditioning module and then input to the analog-to-digital conversion module to be converted into a digital signal, the digital signal is sent to the data processing module, the data processing module completes the filtering of data and selects whether FFT conversion is needed or not according to needs, and the processed data is sent to the control and protection system for use through the communication output module.
Compared with the prior art, the utility model discloses following beneficial effect has:
this signal sampling board directly has the BNC interface, need not BNC conversion equipment, the output signal of equipment such as access voltage divider that can be convenient, its cost is lower, the volume is littleer, convenient to use, easy standardized extension, efficiency are higher.
In an alternative embodiment, referring to fig. 3, the signal conditioning module 30 may include: the circuit comprises an isolation amplifier D1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7 and an operational amplifier D2;
the positive phase input end of the isolation amplifier D1 is connected to the output end of the voltage-current switching module 20, the negative phase input end, the input common end and the output common end are all grounded, and the input power end and the output power end are connected to a power supply; the non-inverting output end is connected with one end of the first resistor R1, and the inverting output end is connected with one end of the second resistor R2;
one end of the first capacitor C1 is connected with the input common end, and the other end is connected with a power supply; one end of the second capacitor C2 is connected with the output common end, and the other end is connected with a power supply;
the other end of the first resistor R1 is connected with one end of a third resistor R3, one end of a fourth resistor R4 and one end of a third capacitor C3; the other end of the second resistor R2 is connected with the other end of the third capacitor C3, one end of a fifth resistor R5 and one end of a sixth resistor R6; the other end of the sixth resistor R6 is grounded, the other end of the third resistor R3 is connected to one end of the fourth capacitor C4 and the output end of the operational amplifier D2, the other end of the fourth resistor R4 is connected to the other end of the fourth capacitor C4 and the inverting input end of the operational amplifier D2, the other end of the fifth resistor R5 is connected to one end of the fifth capacitor C5 and the non-inverting input end of the operational amplifier D2, and the other end of the fifth capacitor C5 is grounded; the output end of the operational amplifier D2 is connected to one end of a seventh resistor R7, the other end of the seventh resistor R7 serves as the output end of the signal conditioning module, positive and negative power supply ends of the operational amplifier D2 are both connected to a power supply, one end of the sixth capacitor C6 is connected to the positive power supply end of the operational amplifier D2, and the other end of the sixth capacitor C6 is grounded; one end of the seventh capacitor C7 is connected to the other end of the sixth capacitor C6, and the other end is connected to a power supply.
The first capacitor C1, the second capacitor C2, the sixth capacitor C6 and the seventh capacitor C7 can play a role in filtering, noise of the whole circuit is reduced, and working reliability of the circuit and accuracy of output signals are improved.
In addition, the isolation operational amplifier D1 can isolate the front and rear sides of D1 to prevent crosstalk and improve the reliability of the circuit, and the cost of the isolation operational amplifier is low, so that the cost of the whole circuit can be effectively reduced.
In an alternative embodiment, with continued reference to fig. 3, the voltage-to-current switching module 20 includes a diode T1, a first inductor L1, a second inductor L2, a third inductor L3, a variable resistor RS, an eighth resistor R8, an eighth capacitor C8, and a mode switch K1;
the diode T1 is connected in parallel to the BNC interface 10, one end of the first inductor L1 is connected to one end of the diode T1, the other end of the first inductor L is connected to one end of the second inductor L2, one end of the third inductor L3 and one end of the eighth resistor R8, one end of the variable resistor RS is connected to the other end of the diode T1, the other end of the second inductor L2 is grounded, the other end of the third inductor L3 and one end of the eighth capacitor C8 are grounded, the other end of the eighth resistor R8 is connected to the other end of the eighth capacitor C8 and is connected to the non-inverting input terminal of the isolation amplifier D1, and the mode switch K1 is connected in parallel to both sides of the first inductor L1.
It should be noted that the mode switch K1 may also be replaced by a short-circuit point, when a current or voltage mode needs to be switched, the first inductor L1 may be short-circuited by closing the mode switch K1 or short-circuiting the short-circuit point replacing the mode switch K1, so as to implement a current sampling mode, and the first inductor L1 may be connected to a circuit to function by disconnecting the mode switch K1 or disconnecting the short-circuit point replacing the mode switch K1, so as to implement a voltage sampling mode.
In addition, the diode T1 is provided to protect against breakdown, thereby improving the safety of the voltage-current switching module 20.
Fig. 4 shows a working principle diagram of the signal sampling plate of the present invention. As shown in fig. 4, the sampling notebook collects the conditioning input signal through the collecting part (i.e., the BNC interface, the voltage/current switching module, and the signal conditioning module), outputs the conditioning input signal to the analog-to-digital conversion module to convert the conditioning input signal into an AD data signal, performs digital filtering and harmonic extraction through the FPGA (i.e., the data processing module), and transmits the AD data signal to the control protection system through the high-speed backplane communication.
In addition, signals issued by the control protection system can also be transmitted to the FPGA through high-speed backplane communication, converted into conversion control signals through an AD conversion control unit integrated in the FPGA, and sent to the analog-to-digital conversion module.
To sum up, the utility model provides a signal sampling board directly has the BNC interface, need not BNC conversion equipment, the output signal of equipment such as access divider that can be convenient, its cost is lower, the volume is littleer, convenient to use, easily standardized extension, efficiency are higher.
The present invention has been explained by using specific embodiments, and the explanation of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been disclosed with reference to the above preferred embodiment, it is not intended to limit the present invention, and any person skilled in the art can make modifications or changes equivalent to the above disclosed technical content without departing from the scope of the present invention, but all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. A signal sampling plate, comprising: the BNC interface and the voltage-current switching module;
the BNC interface is used for receiving a sampling signal;
the voltage and current switching module is connected with the BNC interface and is used for switching the working mode of the signal sampling plate to a voltage sampling mode when the sampling signal is a voltage signal and switching the working mode of the signal sampling plate to a current sampling mode when the sampling signal is a current signal.
2. The signal sampling plate of claim 1, further comprising: a signal conditioning module;
the signal conditioning module is connected to the output end of the voltage-current switching module and is used for conditioning the sampling signal.
3. The signal sampling board of claim 2, wherein the signal conditioning module comprises: the circuit comprises an isolation amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor and an operational amplifier;
the positive phase input end of the isolation amplifier is connected with the output end of the voltage-current switching module, the negative phase input end, the input public end and the output public end are all grounded, and the input power end and the output power end are connected with a power supply; the positive phase output end is connected with one end of the first resistor, and the negative phase output end is connected with one end of the second resistor;
one end of the first capacitor is connected with the input common end, and the other end of the first capacitor is connected with a power supply; one end of the second capacitor is connected with the output common end, and the other end of the second capacitor is connected with a power supply;
the other end of the first resistor is connected with one end of a third resistor, one end of a fourth resistor and one end of a third capacitor; the other end of the second resistor is connected with the other end of the third capacitor, one end of the fifth resistor and one end of the sixth resistor; the other end of the sixth resistor is grounded, the other end of the third resistor is connected with one end of the fourth capacitor and the output end of the operational amplifier, the other end of the fourth resistor is connected with the other end of the fourth capacitor and the inverting input end of the operational amplifier, the other end of the fifth resistor is connected with one end of the fifth capacitor and the non-inverting input end of the operational amplifier, and the other end of the fifth capacitor is grounded; the output end of the operational amplifier is connected with one end of a seventh resistor, the other end of the seventh resistor is used as the output end of the signal conditioning module, positive and negative power supply ends of the operational amplifier are both connected with a power supply, one end of the sixth capacitor is connected with a positive power supply end of the operational amplifier, and the other end of the sixth capacitor is grounded; one end of the seventh capacitor is connected with the other end of the sixth capacitor, and the other end of the seventh capacitor is connected with a power supply.
4. The signal sampling board of claim 3, wherein the voltage-to-current switching module comprises: the circuit comprises a diode, a first inductor, a second inductor, a third inductor, a variable resistor, an eighth capacitor and a mode selector switch;
the diode is connected in parallel to the BNC interface; one end of the first inductor is connected with one end of the diode, and the other end of the first inductor is connected with one end of the second inductor, one end of the third inductor and one end of the eighth resistor; one end of the variable resistor is connected with the other end of the diode, the other end of the variable resistor is grounded, and the other end of the second inductor, the other end of the third inductor and one end of the eighth capacitor are grounded; the other end of the eighth resistor is connected with the other end of the eighth capacitor and is connected with a positive phase input end of the isolation amplifier; the mode switching switch is connected in parallel to two sides of the first inductor.
5. The signal sampling plate of claim 2, further comprising: an analog-to-digital conversion module;
the analog-to-digital conversion module is connected with the output end of the signal conditioning module and is used for converting the conditioned sampling signal into a digital signal.
6. The signal sampling plate of claim 5, further comprising: a data processing module;
and the data processing module is connected with the output end of the analog-to-digital conversion module and is used for filtering and extracting harmonic waves of the digital signals.
7. The signal sampling board of claim 6, wherein the data processing module is an FPGA.
8. The signal sampling plate of claim 6, further comprising: a communication output module;
the communication output module is connected with the output end of the data processing module and used for outputting the processed digital signals to external equipment.
9. The signal sampling board of claim 8, wherein the communication output module is a serial backplane.
10. The signal sampling board of claim 2, wherein the BNC interface, the voltage-to-current switching module, and the signal conditioning module are all plural.
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| CN201921900419.7U CN211086439U (en) | 2019-11-06 | 2019-11-06 | Signal sampling board |
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| CN201921900419.7U CN211086439U (en) | 2019-11-06 | 2019-11-06 | Signal sampling board |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114002478A (en) * | 2021-11-01 | 2022-02-01 | 深圳市泛海三江电子股份有限公司 | Multi-mode switching method and system for detecting alternating voltage/current signal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114002478A (en) * | 2021-11-01 | 2022-02-01 | 深圳市泛海三江电子股份有限公司 | Multi-mode switching method and system for detecting alternating voltage/current signal |
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