CN111650426B - Heavy current direct current ammeter based on twin-core technique - Google Patents
Heavy current direct current ammeter based on twin-core technique Download PDFInfo
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- CN111650426B CN111650426B CN202010524041.6A CN202010524041A CN111650426B CN 111650426 B CN111650426 B CN 111650426B CN 202010524041 A CN202010524041 A CN 202010524041A CN 111650426 B CN111650426 B CN 111650426B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
Abstract
The invention relates to the technical field of direct current meters, in particular to a high-current direct current meter based on a double-core technology, which comprises a shell, a connecting seat, a base plate, a metering chip, a functional chip, a communication module, a first storage module, a second storage module, a current measuring unit, a voltage measuring unit, a data interface, two wiring boards, a radiating fin and a sampling resistor, wherein the data interface is installed on the shell, the sampling resistor is connected between the two wiring boards, the wiring boards are installed on the connecting seat, the current measuring unit measures the partial pressure at two ends of the sampling resistor, the voltage measuring unit is connected with the wiring boards, the current measuring unit, the voltage measuring unit and the first storage module are all connected with the metering chip, and the communication module, the second storage module and the data interface are all connected with. The substantial effects of the invention are as follows: the dual cores are adopted to respectively provide application function support and a metering function, so that the accuracy of the direct current meter is improved while rich services are provided.
Description
Technical Field
The invention relates to the technical field of direct current ammeters, in particular to a high-current direct current ammeter based on a dual-core technology.
Background
A dc ammeter is a meter used to measure the current intensity in a dc circuit. Since the conventional ammeter employs a magnetoelectric system measuring mechanism, the current allowed to pass is small, about several microamperes to several hundred microamperes. In practical application, a shunt resistor needs to be additionally connected, so that the maximum measurement current and the accuracy of the direct current ammeter are mutually restricted. If the maximum measurement current is increased, the measurement accuracy in a low current state is sacrificed, and even the low current cannot be measured. The problem of narrow range can be solved through the current direct measurement technology, but under the wide range state, the accuracy that the electric current was gathered just can be guaranteed to the ampere meter need carry out the timing of refining. In order to facilitate the acquisition of the electric quantity data, the ammeter needs to have a communication function. Along with the popularization of intelligent electric equipment, the ammeter also develops towards the intelligent direction, so that the data required to be processed by the ammeter is increased, and the responsiveness and the reliability of an electric quantity acquisition task are reduced. Therefore, it is necessary to develop an electric energy meter with reliable metering and function expansion capability.
Chinese patent CN205749639U, published 2016, 11, 30, a wide-range ammeter, which comprises a current detection transformer electrically connected to the ground of a high-voltage electrical device, a rectifier module and a meter display module sequentially connected to the current detection transformer, a protection module connected to the meter display module, and an overcurrent alarm module and an operation status indication module connected to the rectifier module. Although the technical scheme realizes non-internal resistance measurement and has small influence on the characteristics of the original circuit, the measurement range is still small, and the technical problem that the current DC ammeter has small measurement range or low precision can not be solved. .
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the technical problem that the accuracy of the existing DC current meter is low is solved. The invention provides a heavy-current direct-current ammeter based on a double-core technology.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a high-current direct-current ammeter based on a double-core technology comprises a shell, a connecting seat, a base plate, a metering chip, a functional chip, a communication module, a first storage module, a second storage module, a current measuring unit, a voltage measuring unit, a data interface, two wiring boards, radiating fins and a sampling resistor, wherein the base plate is installed in the shell, the connecting seat is connected with the shell, the metering chip, the functional chip and a memory are all installed on the base plate, the data interface is installed on the shell, the sampling resistor is connected between the two wiring boards, the wiring boards are installed on the connecting seat, the current measuring unit measures the partial pressure at the two ends of the sampling resistor, one end of the voltage measuring unit is connected with the wiring boards, the other end of the voltage measuring unit is grounded, and the current measuring unit, the voltage measuring unit and the first storage module are all, the communication module, the second storage module and the data interface are all connected with the functional chip. The current measuring unit is connected with the sampling resistor through a sampling pin. The function chip can complete the function tasks of data reporting, data query, manual field debugging, data setting and the like, rich services are provided, metering and use of the ammeter are facilitated, the metering chip executes the metering tasks only according to a preset program, the metering results are stored in the memory periodically and sent to the function chip, the metering chip can accurately and timely process the data collected by the current measuring unit and the voltage measuring unit, correction processing is carried out, more accurate metering results are obtained, and therefore the accuracy of the DC ammeter is improved.
Preferably, the liquid crystal display device further comprises a liquid crystal screen, a dot matrix liquid crystal driver and keys, wherein the liquid crystal screen and the keys are mounted on the shell, the liquid crystal screen is connected with the dot matrix liquid crystal driver, the dot matrix liquid crystal driver and the keys are connected with the functional chip, the functional chip displays data and menus through the liquid crystal screen, the keys perform menu page turning and selection, and the keys are used for page turning and selection through two key buttons or are used for page turning and selection through key length buttons. The cooperation of the liquid crystal screen and the keys can facilitate the on-site checking of the state and the metering result of the ammeter, the arrangement and installation of the ammeter or the troubleshooting of the ammeter are facilitated, and the working reliability of the power meter is improved.
Preferably, the first storage module includes a FRAM memory and a first FLASH memory, the first FLASH memory is configured to store measurement data obtained by the metering chip, the measurement data includes periodically acquired voltage data, current data, power data obtained through calculation, total active power obtained through integration operation, forward active power obtained through integration operation, and reverse active power obtained through integration operation, the metering chip completes the acquisition and calculation of the measurement data at a period t1, and temporarily stores the measurement data in the chip, outputs the temporarily stored measurement data in the chip to the FRAM memory at a period t2, transfers the measurement data in the FRAM memory to the first FLASH memory at a period t3, and sends the measurement data generated in the period stored in the first FLASH memory to the function chip at a period t 4. The FRAM memory has the advantage of high read-write speed, but is not suitable for storing a large amount of metering data, the data storage cost can be reduced by using the first FLASH memory, and the read-write speed can be improved by combining the FRAM memory.
Preferably, the second storage module comprises an EEROM memory and a second FLASH memory, and the functional chip uses the EEROM memory to cache data and uses the second FLASH memory to store data and programs.
Preferably, the system also comprises a Bluetooth communication module and a third FLASH memory, wherein the Bluetooth communication module is connected with the functional chip, the third FLASH memory is connected with the Bluetooth communication module, and the functional chip realizes Bluetooth communication connection through the Bluetooth communication module and provides data modification, inquiry and transmission services.
Preferably, the communication module is a 485 communication module, the 485 communication module is connected with a functional chip, and the functional chip is in real-time communication with external equipment through the 485 communication module or the Bluetooth communication module. The 485 communication module has the advantage of high communication speed, the 485 external communication speed can reach 921600bps at the fastest speed, and the program upgrading task of the functional chip can be completed through the 485 communication module. The metering chip can also complete the task of program upgrading through the transparent transmission communication of the functional chip.
Preferably, the device further comprises a guide rail groove, wherein the guide rail groove is arranged at the bottom of the shell and is used for being clamped with the guide rail. The installation of the ammeter can be conveniently carried out by the installation of the guide rail.
Preferably, still include two flip and apron, casing upper portion is equipped with the projection that is used for rotatory joint flip, flip is connected with the casing joint, the apron is connected with the connecting seat, the apron covers wiring board and fin. The flip cover and the cover plate can avoid protecting the electronic components.
The substantial effects of the invention are as follows: the double-core is adopted to respectively provide application function support and a metering function, wherein the functional chip can finish functional tasks such as data reporting, data query, manual field debugging and data setting, abundant services are provided, metering and use of the ammeter are facilitated, and the metering task is executed by the metering chip only according to a preset program, so that the metering chip can accurately and timely process data collected by the current measuring unit and the voltage measuring unit, more accurate metering results are obtained, and the accuracy of the DC ammeter is improved.
Drawings
Fig. 1 is a schematic diagram of connection of components of an ammeter according to an embodiment.
FIG. 2 is a diagram illustrating an ammeter according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a wiring board structure according to an embodiment.
Fig. 4 is a schematic structural diagram of a housing according to an embodiment.
FIG. 5 is a schematic diagram of a sampling pin location according to an embodiment.
FIG. 6 is a schematic diagram of a second embodiment of a cover plate.
Wherein: 1. the device comprises a liquid crystal screen, 2, a flip cover, 3, a shell, 4, a cover plate, 5, a wiring board, 6, a radiating fin, 7, a sampling resistor, 8, a connecting seat, 9, a guide rail, 10, an external clock input port, 11, a checking wiring port, 12, a data interface, 13, a sampling pin, 14, a sealing plate, 15, a pull rod, 16, a loop bar, 101, an FRAM memory, 102, a first FLASH memory, 103, a metering chip, 201, a third FLASH memory, 202, a Bluetooth communication module, 301, an EEROM memory, 302, a second FLASH memory, 303, a function chip, 304, a magnetic field detection unit, 305, a dot matrix liquid crystal driver, 306, a liquid crystal backlight, 307, a key, 308 and a 485 communication module.
Detailed Description
The following provides a more detailed description of the present invention, with reference to the accompanying drawings.
The first embodiment is as follows:
a large-current direct current ammeter based on a double-core technology is disclosed, as shown in figure 1, the embodiment comprises a shell 3, a connecting seat 8, a substrate, a metering chip 103, a function chip 303, a communication module, a first storage module, a second storage module, a current measuring unit, a voltage measuring unit, a magnetic field detecting unit 304, a data interface 12, two wiring boards 5, a radiating fin 6 and a sampling resistor 7, wherein the substrate is installed in the shell 3, the connecting seat 8 is connected with the shell 3, the metering chip 103, the function chip 303, the magnetic field detecting unit 304 and a memory are all installed on the substrate, as shown in figure 2, the data interface 12, a liquid crystal screen 1, an external clock input port 10, a checking wiring port 11 and a key 307 are all installed on the shell 3, the liquid crystal screen 1 is connected with a dot matrix liquid crystal driver 305, a liquid crystal backlight 306 is installed on the back of the, The dot matrix liquid crystal driver 305, the magnetic field detection unit 304, the control end of the liquid crystal backlight 306 and the keys 307 are all connected with the functional chip 303, the functional chip 303 displays data and menus through the liquid crystal screen 1, the keys 307 perform menu page turning and selection, the keys 307 perform page turning and selection through two key buttons, or perform page turning and selection through long and short keys of the keys 307, the upper portion of the shell 3 is provided with a convex column for rotatably clamping the flip cover 2, the flip cover 2 is connected with the shell 3 in a clamping mode, the cover plate 4 is connected with the connecting base 8, and the cover plate 4 covers the wiring board 5 and the radiating fins 6.
As shown in fig. 3, the sampling resistor 7 is connected between two wiring boards 5, the wiring boards 5 are installed on the connection base 8, the current measuring unit measures the divided voltage at two ends of the sampling resistor 7, one end of the voltage measuring unit is connected with the wiring board 5, the other end of the voltage measuring unit is grounded, the current measuring unit, the voltage measuring unit, the first storage module and the checking wiring port 11 are all connected with the metering chip 103, the communication module, the second storage module and the data interface 12 are all connected with the function chip 303, as shown in fig. 5, the current measuring unit is connected with the sampling resistor 7 through the sampling pin 13. The guide rail groove is arranged at the bottom of the shell 3 and is used for being clamped with the guide rail 9. The installation of suitable guide rail 9 can make things convenient for the installation of ampere meter to dispose.
The bluetooth communication module 202 is connected with the function chip 303, the third FLASH memory 201 is connected with the bluetooth communication module 202, and the function chip 303 realizes bluetooth communication connection through the bluetooth communication module 202 and provides data modification, query and transmission services. As shown in fig. 4, the communication module is a 485 communication module 308, the 485 communication module 308 is connected to the functional chip 303, and the functional chip 303 communicates with an external device in real time through the 485 communication module 308 or the bluetooth communication module 202. The 485 communication module 308 has the advantage of high communication speed, the 485 external communication speed can reach 921600bps at the fastest speed, and the 485 communication module 308 can complete the program upgrading task of the functional chip 303. The metering chip 103 can also complete the task of program upgrading through the transparent communication of the functional chip 303.
The first storage module comprises an FRAM memory 101 and a first FLASH memory 102, the first FLASH memory 102 is used for storing measurement data obtained by the metering chip 103, the measurement data comprises periodically acquired voltage data, periodically acquired current data, power data obtained through calculation, total active electric quantity obtained through integration operation, forward active functional quantity obtained through integration operation and reverse active functional quantity obtained through integration operation, the metering chip 103 finishes acquisition and calculation of the measurement data in a period t1, the measurement data is temporarily stored in a chip, the temporarily stored measurement data in the chip is output to the FRAM memory 101 in a period t2, the measurement data in the FRAM memory 101 is transferred to the first FLASH memory 102 in a period t3, and the measurement data generated in the period and stored in the first FLASH memory 102 is sent to the function chip 303 in a period t 4. The FRAM memory 101 has an advantage of high read/write speed, but is not suitable for storing a large amount of metering data, the data storage cost can be reduced by using the first FLASH memory 102, and the read/write speed can be improved by combining the FRAM memory 101. The second storage module comprises an EEROM 301 and a second FLASH memory 302, and the functional chip 303 uses the EEROM 301 to cache data and uses the second FLASH memory 302 to store data and programs.
As shown in fig. 6, another embodiment of the present invention further includes a sealing plate 14, a pull rod 15, a sleeve rod 16 and a spring, the sleeve rod 16 is fixed outside the cover plate 4, the sleeve rod 16 is a tube with an open end, one end of the pull rod 15 is sleeved in the sleeve rod 16, the other end of the pull rod 15 is connected with the sealing plate 14, the spring is placed in the sleeve rod 16, the pull rod 15 and the sleeve rod 16 are both magnetic conductors, two ends of the spring are respectively and fixedly connected with the pull rod 15 and the sleeve rod 16, one end of the spring is grounded through a lead, the other end of the spring is connected with an I/O pin of the functional chip 303 through a lead, the cover plate 4 is provided with a plurality of heat dissipation slots, and the sealing plate 14 is. Pull rod 15 and loop bar 16 can avoid causing electromagnetic interference to the ampere meter, when function chip 303 obtains the measurement data and shows that the measurement electric current exceeds a definite value, make the spring circular telegram through the pin, drive shrouding 14 and remove, make shrouding 14 notch and radiating groove align, increase the radiating rate of fin 6, the heat that simultaneously great electric current brought can faster heated air, arouse near the air inflation of fin 6 and discharge through the radiating groove, form the convection current and accelerate radiating simultaneously can make the air current blow away the dust, avoid the dust deposit on fin 6, be fit for using when measuring great electric current, when measuring lower electric current, the radiating groove is sealed, reduce the dust deposit. The notch of cover plate 14 has a slope that opens outward, and the I/O pins of functional chip 303 alternately output 0 and 1, i.e., alternately output high and low levels. Can cause the spring to contract and resume in turn, drive shrouding 14 motion, the outside open slope can drive gas flow, discharges the heated air in the apron 4 with higher speed, improves the radiating effect.
The substantial effect of the embodiment is as follows: the double-core is adopted to provide application function support and metering functions respectively, wherein the functional chip 303 can complete the functional tasks of data reporting, inquiring, manual field debugging, setting and the like, rich services are provided, metering and use of the ammeter are facilitated, the metering chip 103 only executes the metering task according to a preset program, the metering chip 103 can accurately and timely process data collected by the current measuring unit and the voltage measuring unit, a more accurate metering result is obtained, and the accuracy of the DC ammeter is improved.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (7)
1. A heavy current DC ammeter based on a dual-core technology is characterized in that,
comprises a shell, a connecting seat, a base plate, a metering chip, a functional chip, a communication module, a first storage module, a second storage module, a current measuring unit, a voltage measuring unit, a data interface, two wiring boards, a radiating fin and a sampling resistor, the substrate is arranged in the shell, the connecting seat is connected with the shell, the metering chip, the functional chip and the memory are all arranged on the substrate, the data interface is arranged on the shell, the sampling resistor is connected between the two wiring boards, the wiring board is arranged on the connecting seat, the current measuring unit measures the partial voltage at the two ends of the sampling resistor, one end of the voltage measuring unit is connected with the wiring board, the other end of the voltage measuring unit is grounded, the current measuring unit, the voltage measuring unit and the first storage module are all connected with the metering chip, and the communication module, the second storage module and the data interface are all connected with the functional chip;
the connecting device is characterized by also comprising two flip covers and a cover plate, wherein a convex column for rotationally clamping the flip covers is arranged at the upper part of the shell, the flip covers are connected with the shell in a clamping manner, the cover plate is connected with the connecting seat, and the cover plate covers the wiring board and the radiating fins; the sealing plate is fixed on the outer side of the cover plate, the sleeve rod is a pipe with one open end, one end of the pull rod is sleeved in the sleeve rod, the other end of the pull rod is connected with the sealing plate, the spring is placed in the sleeve rod, the pull rod and the sleeve rod are both magnetic conductors, two ends of the spring are respectively fixedly connected with the pull rod and the sleeve rod, one end of the spring is grounded through a lead, the other end of the spring is connected with an I/O pin of the functional chip through the lead, the cover plate is provided with a plurality of heat dissipation grooves, and the sealing plate is provided with notches matched with the heat dissipation grooves; the notch of the sealing plate is provided with a slope which is opened outwards, and the I/O pins of the functional chip alternately output high and low levels.
2. A high current DC ammeter based on dual core technology as claimed in claim 1,
the liquid crystal display and the keys are mounted on the shell, the liquid crystal display is connected with the dot matrix liquid crystal driver, the dot matrix liquid crystal driver and the keys are connected with the functional chip, the functional chip displays data and a menu through the liquid crystal display, the keys perform menu page turning and selection, and the keys are used for page turning and selection through two key buttons or page turning and selection through key length pressing.
3. A high current DC ammeter based on the two-core technology as claimed in claim 1 or 2,
the first storage module comprises an FRAM memory and a first FLASH memory, the first FLASH memory is used for storing measurement data obtained by a metering chip, the measurement data comprises periodically acquired voltage data, current data, power data obtained through calculation, total active electric quantity obtained through integration operation, forward active functional quantity obtained through integration operation and reverse active functional quantity obtained through integration operation, the metering chip finishes the acquisition and calculation of the measurement data in a period t1, the measurement data are temporarily stored in a chip, the temporarily stored measurement data in the chip are output to the FRAM memory in a period t2, the measurement data in the FRAM memory are transferred to the first FLASH memory in a period t3, and the measurement data generated in the period and stored in the first FLASH memory are sent to the functional chip in a period t 4.
4. A high current DC ammeter based on dual core technology as claimed in claim 2,
the second storage module comprises an EEROM and a second FLASH memory, and the functional chip uses the EEROM to cache data and uses the second FLASH memory to store data and programs.
5. A high current DC ammeter based on the two-core technology as claimed in claim 1 or 2,
the Bluetooth communication module is connected with the functional chip, the third FLASH memory is connected with the Bluetooth communication module, the functional chip realizes Bluetooth communication connection through the Bluetooth communication module, and data modification, inquiry and transmission services are provided.
6. A high current DC ammeter based on dual core technology as claimed in claim 5,
the communication module is a 485 communication module, the 485 communication module is connected with the functional chip, and the functional chip is in real-time communication with external equipment through the 485 communication module or the Bluetooth communication module.
7. A high current DC ammeter based on the two-core technology as claimed in claim 1 or 2,
the guide rail groove is formed in the bottom of the shell and used for being connected with the guide rail in a clamping mode.
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Inventor after: Jiang Yunbo Inventor after: Sun Gang Inventor after: Huang Rongguo Inventor after: Guo Haojie Inventor after: Lu Chunguang Inventor after: Xiao Tao Inventor after: Liu Wei Inventor after: Li Yilong Inventor after: Song Lei Inventor after: Jiang Qun Inventor after: Wang Chaoliang Inventor before: Jiang Yunbo Inventor before: Guo Haojie |
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Effective date of registration: 20210531 Address after: 311100 No.8 Shuangyang Road, Renhe street, Yuhang District, Hangzhou City, Zhejiang Province Applicant after: ZHEJIANG REALLIN ELECTRON Co.,Ltd. Applicant after: Marketing service center of State Grid Zhejiang Electric Power Co., Ltd Address before: 311107 No.8 Shuangyang Road, Jiulong village, Renhe street, Yuhang District, Hangzhou City, Zhejiang Province Applicant before: ZHEJIANG REALLIN ELECTRON Co.,Ltd. |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |