CN114415096A - Clamp meter switching system and method - Google Patents

Abstract

The invention provides a clamp meter switching system, which belongs to the technical field of clamp meters and comprises a clamp meter and equipment; the clamp meter comprises: the first connecting module is connected with the storage module; a storage module configured to store at least one clamp meter type and a corresponding calibration coefficient; the apparatus comprises: a second connection module connected to the first connection module; a main control module; the main control module is connected with the second connecting module and is used for controlling the system to operate and calibrating the sampling signal; and the sampling module is connected with the main control module and the second connecting module and is used for sampling signals. The system avoids the technical problems of more calibration points, complex operation and time consumption when the clamp meter of the conventional equipment is replaced. And the operation is convenient, the work can be changed at will according to actual work requirements, the work progress is not influenced, and the work efficiency is improved.

Description

A clamp meter switching system and method

technical field

The invention relates to the technical field of clamp meters, in particular to a clamp meter switching system and method.

Background technique

When the current clamp meter of the device is damaged and needs to be replaced, the only way to do this is to connect a new clamp meter to the device, and then recalibrate the whole.

When the clamp meter is replaced, the device needs to be recalibrated, and the calibration requires a stable power environment and a high-precision standard meter. There are many calibration points, and the operation is complicated and time-consuming. Existing clamp meters and equipment, each phase is bound and cannot be interchanged. When damaged in field use, it cannot continue to work.

SUMMARY OF THE INVENTION

Based on this, the present invention provides a clamp meter switching system and method, which solves the problem of complicated and time-consuming calibration operations when replacing the clamp meter with existing equipment, or the need for verification when it is uncertain whether the equipment and the clamp meter match.

The embodiment of the present invention provides a clamp meter switching system, the system includes a clamp meter and equipment;

The clamp meter includes:

a first connection module, the first connection module is connected to the storage module;

a storage module, the storage module is configured to store at least one clamp meter type and a corresponding calibration coefficient;

The device includes:

a second connection module, the second connection module is connected to the first connection module;

a main control module, the main control module is connected to the second connection module for controlling the operation of the system and calibrating the sampling signal;

The sampling module is connected to the main control module and the second connection module, and is used for sampling signals.

Further, the storage module includes:

A first resistor, a second resistor, and a single-chip microcomputer with a storage function, one end of the first resistor and the second resistor is connected to the first connection module, and the other end of the first resistor and the second resistor is connected to the storage function. single chip microcomputer.

Further, the device further includes a power supply module, which is connected to the main control module and the sampling module, and supplies power to the main control module and the sampling module.

Further, the main control module includes:

The main control chip is used to control the operation of other modules and calibrate the sampling signal;

a power supply module, connected with the main control chip and the power supply module, and used for converting the voltage provided by the power supply module into the working voltage of the main control chip;

a data channel module, connected with the sampling module and the main control chip, for the main control chip to communicate with the sampling module, and for the main control chip to read the sampling data of the sampling module;

The external interface module is connected with the main control chip and the second connection module, and is used for the main control chip to drive the second connection module to communicate with the external communication port, and to read the information of the storage module.

Further, the sampling module includes:

A relay control module, connected with the main control chip, controls the voltage sampling module and the current sampling module to switch gears;

a voltage sampling module, connected to the second connection module, for sampling the voltage signal and transmitting the voltage signal to the analog-to-digital conversion module;

a current sampling module, connected to the second connection module, for sampling the current signal and transmitting the current signal to the analog-to-digital conversion module;

The analog-to-digital conversion module compares the voltage signal and the current signal with the reference voltage, and converts the input analog signal into a digital signal and transmits it to the main control chip.

Further, the first connection module includes a first connection end, a second connection end, a third connection end and a fourth connection end; the second connection module includes a fifth connection end, a sixth connection end, and a seventh connection end terminal and the eighth connection terminal;

The first connection end, the second connection end, the third connection end and the fourth connection end are all connected to the single-chip microcomputer with a memory function; one end of the first resistor is connected to the second connection One end of the second resistor is connected between the fourth connection end and the single-chip microcomputer with a storage function; one end of the second resistor is connected between the third connection end and the between the single-chip microcomputers with a storage function, and the other end is connected between the fourth connection terminal and the single-chip microcomputer with a storage function;

The fifth connection end is connected to the power supply; the sixth connection end is connected to the main control module and the second connection end; the seventh connection end is connected to the main control module and the third connection end; The eighth connection end is grounded and connected to the fourth connection end.

Further, the first connection module and the second connection module are pluggable.

Further, the device further includes a display module, the display module is connected to the main control module, and is used for displaying the information of the main control module.

The embodiment of the present invention also provides a clamp meter switching method, the method includes:

Sampling voltage signal and current signal; and read clamp meter type;

If the clamp meter type is read, read the calibration coefficient corresponding to the clamp meter type; if the clamp meter type is not read or the calibration coefficient corresponding to the clamp meter type is not read, continue to read the clamp meter type;

The voltage signal and the current signal are calibrated according to the read calibration coefficient.

The present invention provides a clamp meter switching system and method. By arranging a storage module in the clamp meter, at least one type of clamp meter and a corresponding calibration coefficient are stored; The connection module and the second connection module connect the clamp meter with the device, the main control module reads the clamp meter type and the corresponding calibration coefficient from the storage module, then the sampling module collects signals, and transmits the collected signals to the main control module, Then, the main control module calibrates the sampling signal through the calibration coefficient, and then completes the calibration of the equipment, avoiding the technical problems of complicated operation and time-consuming when the clamp meter of the current equipment is replaced with many calibration points. And it is easy to operate and can be replaced at will according to the actual needs of the work, without affecting the progress of the work, and improving the work efficiency.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic diagram of a clamp meter switching system provided by a first embodiment of the invention;

2 is a schematic diagram of a practical application of a clamp meter switching system provided by the first embodiment of the present invention;

FIG. 3 is a schematic diagram of a clamp meter switching system according to the first embodiment of the present invention;

4 is a schematic diagram of a clamp meter switching system according to the first embodiment of the present invention;

FIG. 5 is a schematic flowchart of a method for switching a clamp meter according to a second embodiment of the present invention.

Detailed ways

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of this application; the terms used herein in the specification of the application are for the purpose of describing specific embodiments only It is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the description and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the description and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific order.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor a separate or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the following description, suffixes such as 'module', 'component' or 'unit' used to represent elements are used only to facilitate the description of the present application, and have no specific meaning per se.

1 is a schematic diagram of a clamp meter switching system provided by an embodiment of the present invention. As shown in the figure, the system includes a clamp meter 1 and a device 2; the clamp meter 1 includes: a first connection module 11, which is The first connection module 11 is connected to the storage module 12; the storage module 12 is configured to store at least one clamp meter type and corresponding calibration coefficients; the device 2 includes: a second connection module 21, the The second connection module 21 is connected to the first connection module 11; the main control module 22; the main control module 22 is connected to the second connection module 21 for controlling the operation of the system and calibrating the sampling signal; the sampling module 23 , which is connected to the main control module 22 and the second connection module 21 for sampling signals.

The storage module 12 of the clamp meter 1 stores at least one type of clamp meter and the calibration coefficient after the accuracy test of each type of clamp meter. Before leaving the factory, calibrate the small current measurement of the clamp meter socket to ensure the measurement accuracy of the device 2. The main control module 22 of the device 2 reads the clamp meter type and the corresponding calibration coefficient of the storage module 12 in the clamp meter 1 in each reading cycle, and the sampling module 23 of the device 2 collects signals and transmits the collected signals to the main control module. 22. The main control module 22 performs data calibration according to the read calibration coefficient, thereby realizing the calibration of the device 2. The type of the clamp meter 1 and the calibration coefficient corresponding to the type can be selected according to actual needs, and can be switched at will, avoiding the problems of many calibration points, complicated and time-consuming operation when switching the clamp meter in the prior art. And the operation is convenient, does not affect the work progress, and improves the work efficiency.

2 is a schematic diagram of a practical application of a clamp meter switching system provided by an embodiment of the present invention. The storage module 12 includes a first resistor R1, a second resistor R2, and a single-chip microcomputer with a storage function. One end of the resistor R1 and the second resistor R2 is connected to the first connection module 11 , and the other end of the first resistor R1 and the second resistor R2 is connected to the single-chip microcomputer with a memory function.

In this embodiment, AT24C512C chip is selected for the single-chip microcomputer with storage function. AT24C512 is a 512k-bit (64K×8-bit) serial large-capacity electrically erasable programmable memory EEPROM recently produced by ATMEL. Its main features are: it has the following three working voltages: 5.0V; 2.7V; 1.8V; it can be organized into 64k*8 storage units internally; it conforms to the bidirectional data transfer I2C protocol; it has hardware write protection and software data protection functions; Page (128 bytes) write or byte-by-byte read and write mode. The AT24C512 has eight pins. A0, A1: address selection input. In the serial bus structure, if you need to connect 4 AT24C512 chips, you can use A0 and A1 to distinguish each chip; SCL: serial clock input, usually the data on SDA is written into the memory on its rising edge, and on the falling edge. Read data from memory and send it to SDA; SDA: bidirectional serial data input and output port, used for data exchange between memory and microcontroller; WP: write protection input, when this pin is connected to ground, write operation is allowed; and When VCC is connected, all write memory operations are prohibited, if not connected, this pin will be pulled down to ground inside the chip.

Further, the first connection module 11 includes a first connection end A, a second connection end B, a third connection end C and a fourth connection end D; the second connection module 21 includes a fifth connection end E, a third connection end C and a fourth connection end D; Six connection ends F, seventh connection end G and eighth connection end H;

The first connection end A, the second connection end B, the third connection end C and the fourth connection end D are all connected to the single-chip microcomputer with a memory function; one end of the first resistor R1 is connected to the second connection end Between B and the single-chip microcomputer with storage function, the other end is connected between the fourth connection terminal D and the single-chip microcomputer with storage function; one end of the second resistor R2 is connected to the third connection terminal C The other end is connected between the fourth connection terminal D and the single-chip microcomputer with a storage function.

That is, the first connection end A is connected to the GND, NC, and A1 pins of the AT24C512 chip, the second connection end B is connected to the SDA pin of the AT24C512 chip, the third connection end C is connected to the SCL pin of the AT24C512 chip, and the fourth connection Terminal D is connected to the WP, VCC, A0 pins of the AT24C512 chip, one end of the first resistor R1 is connected between the second connection terminal B and the SDA pin of the AT24C512 chip, and the other end is connected to the fourth connection terminal D and AT24C512 Between the WP and VCC pins of the chip; one end of the second resistor R2 is connected between the third connection end and the SCL pin of the AT24C512 chip, and the other end is connected between the fourth connection end D and the AT24C512 chip. Between the WP and VCC pins; since the data pin of the AT24C512C chip is in an open-drain state and has no power supply, the first resistor R1 and the second resistor R2 are externally connected to the pull-up resistors to provide voltage for the AT24C512C chip.

The fifth connection end E is connected to the power supply VCC; the sixth connection end F is connected to the main control module 22 and the second connection end B; the seventh connection end G is connected to the main control module 22 and the second connection end B. the third connection end C; the eighth connection end H is grounded and connected to the fourth connection end D.

Further, the first connection module 11 and the second connection module 12 are pluggable. It makes it faster and more convenient to transport and use.

3 is a schematic diagram of a clamp meter switching system provided by an embodiment of the present invention. The device 2 further includes a power supply module 24, which is connected to the main control module 22 and the sampling module 23 and is the main control module. Module 22 and the sampling module 23 supply power.

4 is a schematic diagram of a clamp meter switching system provided by an embodiment of the present invention. The main control module 22 includes: a main control chip 221, which is used to control the operation of other modules and calibrate the sampling signal; the power supply module 222, which is connected with The main control chip 221 and the power supply module 24 are connected to convert the voltage provided by the power supply module 24 into the working voltage of the main control chip 221; the data channel module 223 is connected to the sampling module 23 and the main control chip 221 , for the main control chip 221 to communicate with the sampling module 23, for the main control chip 221 to read the sampling data of the sampling module 23; the external interface module 224, with the main control chip 221, the second The connection module 21 is connected for the main control chip 221 to drive the second connection module 21 to communicate with the external communication port, and to read the information of the storage module 12 .

The sampling module 23 includes: a relay control module 231, which is connected to the main control chip 221 and controls the voltage sampling module 232 and the current sampling module 233 to switch gears; since the signal sampling is not completely linear, in order to ensure the sampling of the equipment Accuracy, multiple gears are set. The upshift operation is performed when the measured value is greater than 120% of the current gear, and the downshift is performed when the measured value is less than 110% of the previous gear. The voltage sampling module 232 is connected to the second connection module 21 for sampling the voltage signal and transmits the voltage signal to the analog-to-digital conversion module 234; the current sampling module 233 is connected to the second connection module 21 for sampling The current signal, transmits the current signal to the analog-to-digital conversion module 234; the analog-to-digital conversion module 234 compares the reference voltage with the voltage signal and the current signal, and converts the input analog signal into a digital signal and transmits it to the main control chip 221 .

The device 2 further includes a display module 24 (not shown in the figure), and the display module 24 is connected to the main control module 22 for displaying information of the main control module 22 .

Figure 5 is a schematic flowchart of a clamp meter switching method. As shown in the figure, the method includes:

S1: Sampling voltage signal and current signal; and read clamp meter type;

S2: If the clamp meter type is read, read the calibration coefficient corresponding to the clamp meter type; if the clamp meter type is not read or the calibration coefficient corresponding to the clamp meter type is not read, continue to read the clamp meter type ;

If the clamp meter type is not read, return to S1 to continue reading the clamp meter type;

If the clamp meter type is read, the calibration coefficient corresponding to the clamp meter type is read; if the calibration coefficient is not read, then return to S1 to continue reading the clamp meter type;

S3: calibrate the voltage signal and the current signal according to the read calibration coefficient.

For other details of the technical solutions implemented in the clamp-meter switching method provided by the foregoing embodiments, reference may be made to the description in the clamp-meter switching system in the foregoing embodiments, which will not be repeated here.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage In the medium, when the computer program is executed, it may include the processes of the above-mentioned method embodiments. Wherein, any reference to memory, storage, database or other medium used in the various embodiments provided in this application may include non-volatile and/or volatile memory. Nonvolatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous chain Road (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. Module completion, that is, dividing the internal structure of the device into different functional units or modules to complete all or part of the functions described above.

The above-mentioned embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it is still possible to implement the foregoing implementations. The technical solutions described in the examples are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the within the protection scope of the present invention.

Claims (9)

1. A clamp meter switching system, wherein the system comprises a clamp meter and equipment; The clamp meter includes: a first connection module, the first connection module is connected to the storage module; a storage module, the storage module is configured to store at least one clamp meter type and a corresponding calibration coefficient; The device includes: a second connection module, the second connection module is connected to the first connection module; a main control module, the main control module is connected to the second connection module for controlling the operation of the system and calibrating the sampling signal; The sampling module is connected to the main control module and the second connection module, and is used for sampling signals. 2. A clamp meter switching system according to claim 1, wherein the storage module comprises: A first resistor, a second resistor, and a single-chip microcomputer with a storage function, one end of the first resistor and the second resistor is connected to the first connection module, and the other end of the first resistor and the second resistor is connected to the storage function. single chip microcomputer. 3 . A clamp meter switching system according to claim 1 , wherein the device further comprises a power supply module, which is connected to the main control module and the sampling module, and is the main control module and the sampling module. 4 . The sampling module is powered. 4. A clamp meter switching system according to claim 3, wherein the main control module comprises: The main control chip is used to control the operation of other modules and calibrate the sampling signal; a power supply module, connected with the main control chip and the power supply module, and used for converting the voltage provided by the power supply module into the working voltage of the main control chip; a data channel module, connected with the sampling module and the main control chip, for the main control chip to communicate with the sampling module, and for the main control chip to read the sampling data of the sampling module; The external interface module is connected with the main control chip and the second connection module, and is used for the main control chip to drive the second connection module to communicate with the external communication port, and to read the information of the storage module. 5. A clamp meter switching system according to claim 4, wherein the sampling module comprises: A relay control module, connected with the main control chip, controls the voltage sampling module and the current sampling module to switch gears; a voltage sampling module, connected to the second connection module, for sampling the voltage signal and transmitting the voltage signal to the analog-to-digital conversion module; a current sampling module, connected to the second connection module, for sampling the current signal and transmitting the current signal to the analog-to-digital conversion module; The analog-to-digital conversion module compares the voltage signal and the current signal with the reference voltage, and converts the input analog signal into a digital signal and transmits it to the main control chip. 6. A clamp meter switching system according to claim 5, wherein the first connection module comprises a first connection end, a second connection end, a third connection end and a fourth connection end; the first connection end The second connection module includes a fifth connection end, a sixth connection end, a seventh connection end and an eighth connection end; The first connection end, the second connection end, the third connection end and the fourth connection end are all connected to the single-chip microcomputer with a memory function; one end of the first resistor is connected to the second connection One end of the second resistor is connected between the fourth connection end and the single-chip microcomputer with a storage function; one end of the second resistor is connected between the third connection end and the between the single-chip microcomputers with a storage function, and the other end is connected between the fourth connection terminal and the single-chip microcomputer with a storage function; The fifth connection end is connected to the power supply; the sixth connection end is connected to the main control module and the second connection end; the seventh connection end is connected to the main control module and the third connection end; The eighth connection end is grounded and connected to the fourth connection end. 7 . The clamp meter switching system according to claim 6 , wherein the first connection module and the second connection module are pluggable. 8 . 8 . The clamp meter switching system according to claim 1 , wherein the device further comprises a display module, and the display module is connected to the main control module for displaying the Main control module information. 9. A method for switching a clamp meter, wherein the method comprises: Sampling voltage signal and current signal; and read clamp meter type; If the clamp meter type is read, read the calibration coefficient corresponding to the clamp meter type; if the clamp meter type is not read or the calibration coefficient corresponding to the clamp meter type is not read, continue to read the clamp meter type; The voltage signal and the current signal are calibrated according to the read calibration coefficient.

Images