High anti-interference power measuring instrument
By using fiber optic transmission and electrical isolation technology, combined with a high-isolation power supply unit and an insulating protective cover, the problem of weak anti-interference capability of traditional power measurement instruments has been solved, and high-precision power measurement and analysis have been achieved.
Patent Information
- Application Number
- CN202421828594.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-07-31
AI Technical Summary
Traditional power measurement instruments have weak anti-interference capabilities during signal transmission and are easily affected by electromagnetic interference, leading to inaccurate measurements and damage to control circuits.
Fiber optic transmission technology is used to transmit signals between the voltage and current acquisition channels and the module processing unit, and slots are cut into the circuit board to achieve electrical isolation. Combined with a high-isolation power supply unit and an openable insulating protective cover, the anti-interference capability is enhanced.
It achieves high-precision signal transmission and accurate measurement under high voltage and strong electromagnetic interference environments, improves the instrument's anti-interference capability, and ensures reliable circuit operation.
Smart Images
Figure CN223565778U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electric power measuring instrument technical field, especially a kind of high anti-interference power measuring instrument. BACKGROUND
[0002] With the progress and development of semiconductor technology, SiC, GaN and other devices are widely used in electric power, new energy vehicles and other fields due to their characteristics of high voltage resistance, high frequency and high power, and advantages of fast switching speed and high efficiency, especially in photovoltaic inverters, motor frequency converters and other products, which can significantly reduce product power consumption, improve energy conversion efficiency and reduce product size. However, high current and voltage change rate will be generated during the fast switching process of SiC, GaN devices, which will generate strong electromagnetic interference through the parasitic capacitance and inductance in the circuit. When the power measuring instrument measures such signals, if appropriate electrical isolation and shielding measures are not taken during signal transmission, interference signals will be introduced into the measurement and control part, affecting the normal operation of the control circuit, causing the touch screen of the instrument to malfunction, and even causing damage to the measurement and control circuit, endangering the safety of surrounding equipment and operators. Therefore, it is necessary to improve the anti-interference ability of the power measuring instrument from the aspects of signal transmission, power supply and electromagnetic shielding, to realize accurate and high-precision power measurement and analysis.
[0003] Traditional power measuring instruments generally include voltage acquisition channels and current acquisition channels, and do not add isolation when transmitting the collected voltage or current signals to the processing unit, or use chip-level magnetic isolators to realize data transmission, which plays a protective and interference-removing role in the circuit. The disadvantage of magnetic isolation is that transient common-mode pulses may appear at both ends of the isolator. When the common-mode pulse has a large enough change rate, it will cause logic error of the isolator, unable to accurately transmit signals, and weak in anti-interference ability. SUMMARY
[0004] In view of the deficiencies of the prior art, the utility model provides a high anti-interference power measuring instrument, aiming at solving the problem of weak anti-interference ability of traditional electric power measuring instruments.
[0005] To improve the anti-interference ability of the instrument during transmission, the utility model adopts the following improved technical solutions:
[0006] The application discloses a high anti-interference power measuring instrument, which comprises at least one power measuring module and a central processing unit; the power measuring module comprises a voltage collection channel, a first optical fiber transmission unit, a module processing unit, a first high-isolation power supply unit, a current collection channel, a second optical fiber transmission unit and a second high-isolation power supply unit; the first optical fiber transmission unit is connected with the voltage collection channel and the module processing unit respectively; the second optical fiber transmission unit is connected with the current collection channel and the module processing unit respectively; and the module processing unit is connected with the central processing unit.
[0007] The first optical fiber transmission unit between the voltage collection channel and the module processing unit adopts optical fiber transmission. The optical fiber is an electromagnetic insulator, is not sensitive to electromagnetic interference, has high anti-interference capacity, fast response speed, small size, light weight, reliable operation and simple operation, and can realize high-precision transmission of signals in a high-voltage strong electromagnetic interference environment.
[0008] As a technical scheme, the first optical fiber transmission unit comprises optical fiber and two groups of optical fiber interfaces; one group of the optical fiber interfaces is connected with the voltage collection channel, and the other group of the optical fiber interfaces is connected with the module processing unit; the two groups of the optical fiber interfaces are connected through the optical fiber, and digital signals between the voltage collection channel and the module processing unit are transmitted; the second optical fiber transmission unit comprises optical fiber and two groups of optical fiber interfaces; one group of the optical fiber interfaces is connected with the current collection channel, and the other group of the optical fiber interfaces is connected with the module processing unit; the two groups of the optical fiber interfaces are connected through the optical fiber, and digital signals between the current collection channel and the module processing unit are transmitted. Compared with analog signals, the digital signals also avoid the influence of transmission distance and electromagnetic interference, and improve the anti-interference capacity of the power measuring instrument.
[0009] As a technical scheme, in the above technical scheme, the high anti-interference power measuring instrument further comprises a display unit for human-computer interaction; the display unit is electrically connected with the central processing unit, and the display unit is a touchable liquid crystal screen; in order to prevent the display unit from being interfered with during measurement, a transparent and openable insulating protective cover is installed on the touchable liquid crystal screen. During measurement, the insulating protective cover is in a closed state, and the liquid crystal screen is not touchable, and at this moment, the operation and control of the instrument can be realized through an externally connected mouse and keyboard.
[0010] As a technical scheme, the voltage acquisition channel comprises a voltage signal acquisition component, a first ADC conversion component and a first logic control component; the first ADC conversion component is connected with the voltage signal acquisition component, converts analog signals collected by the voltage signal acquisition component into digital signals, and outputs the digital signals to the first optical fiber transmission unit; the first logic control component is connected with the voltage signal acquisition component; the current acquisition channel comprises a current signal acquisition component, a second ADC conversion component and a second logic control component; the second ADC conversion component is connected with the current signal acquisition component, converts analog signals collected by the current signal acquisition component into digital signals, and outputs the digital signals to the second optical fiber transmission unit; and the second logic control component is connected with the current signal acquisition component.
[0011] Further, the voltage acquisition channel and the current acquisition channel are located on the same circuit board, and a groove is formed between the voltage acquisition channel and the current acquisition channel to realize electrical isolation between the channels.
[0012] Further, the first high-isolation power supply unit and the second high-isolation power supply unit are both magnetic core transformers.
[0013] As a technical scheme, the high-anti-interference power measuring instrument further comprises a shell, and the display unit is located on the shell.
[0014] As a technical scheme, the high-anti-interference power measuring instrument further comprises a USB interface, the USB interface is located on the shell, and a user can connect an external mouse and a keyboard to the USB interface to realize operation control of the instrument.
[0015] Compared with the prior art, the high-anti-interference power measuring instrument has the following beneficial effects:
[0016] The optical fiber transmission unit between the voltage or current acquisition channel and the module processing unit has high voltage isolation level, stronger anti-interference capability, and can realize high-isolation, high-speed and high-precision transmission of signals in a high-voltage and strong electromagnetic interference environment; the high-isolation power supply unit adopts a magnetic core transformer to provide high-isolation and anti-interference power supply for the voltage acquisition channel or the current acquisition channel, so that the circuit can work reliably; the touchable liquid crystal screen is provided with a transparent and openable insulation protective cover, and has strong shielding performance, so as to shield external interference signals in the instrument measurement process, and improve the anti-interference performance of the power measuring instrument as a whole.
[0017] The high-anti-interference power measuring instrument has simple overall structure, and comprehensively improves the anti-interference capability of the electric power measuring instrument from aspects of signal transmission, power supply and electromagnetic shielding, and thus realizes accurate and high-precision power measurement and analysis. BRIEF DESCRIPTION OF DRAWINGS
[0018] ATTACHMENT Figure 1The whole structure schematic diagram of the embodiment of the utility model is shown in the figure.
[0019] In the figure: 1, power measurement module; 2, central processing unit; 3, voltage acquisition channel; 4, first optical fiber transmission unit; 5, module processing unit; 6, first high-isolation power supply unit; 7, current acquisition channel; 8, second optical fiber transmission unit; 9, second high-isolation power supply unit; 10, display unit; 11, voltage signal acquisition assembly; 12, first ADC conversion assembly; 13, first logic control assembly; 14, current signal acquisition assembly; 15, second ADC conversion assembly; 16, second logic control assembly. DETAILED DESCRIPTION
[0020] The specific embodiments of the utility model are described below in combination with the drawings, but those skilled in the art should understand that the following embodiments are only for illustration, and are not intended to limit the scope of the utility model. Those skilled in the art should understand that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the scope and spirit of the utility model. The protection scope of the utility model is defined by the appended claims and their equivalents.
[0021] The embodiment of the utility model discloses a kind of high anti-interference power measurement instruments, and its whole structure schematic diagram is as Figure 1As shown, it comprises a shell, which is provided with a display unit (10) for human-computer interaction and a USB interface for external mouse and keyboard; wherein the display unit (10) is a touchable liquid crystal screen, which is provided with a transparent, openable and closeable insulation protective cover. During the measurement, the insulation protective cover is in a closed state, and the liquid crystal screen is not touchable, at which time the operation and control of the instrument can be realized through the external mouse and keyboard. The instrument has at least one power measurement module (1) and a central processing unit (2) inside. The power measurement module (1) comprises a voltage acquisition channel (3), a first optical fiber transmission unit (4), a module processing unit (5), a first high-isolation power supply unit (6), a current acquisition channel (7), a second optical fiber transmission unit (8) and a second high-isolation power supply unit (9). The voltage acquisition channel (3) comprises a voltage signal acquisition component (11), a first ADC conversion component (12) and a first logic control component (13). After the voltage signal acquisition component (11) acquires the measured voltage signal, the first ADC conversion component (12) converts the acquired voltage signal (analog signal) into a digital signal, which is transmitted to the module processing unit (5) for analysis and processing through the first optical fiber transmission unit (4); the first logic control component (13) is responsible for receiving signals from the module processing unit (5) to realize range switching and zero setting. The current acquisition channel (7) comprises a current signal acquisition component (14), a second ADC conversion component (15) and a second logic control component (16). After the current signal acquisition component (14) acquires the measured current signal, the second ADC conversion component (15) converts the acquired current signal (analog signal) into a digital signal, which is transmitted to the module processing unit (5) for analysis and processing through the second optical fiber transmission unit (8), and the second logic control component (16) is responsible for receiving signals from the module processing unit (5) to realize range switching and zero setting. Finally, the central processing unit (2) analyzes and processes the data from each module processing unit, and presents the measurement results on the display unit (10).
[0022] Preferably, the voltage acquisition channel (3) and the current acquisition channel (7) are located on the same circuit board, and a groove is dug between the voltage acquisition channel (3) and the current acquisition channel (7) to realize electrical isolation between the channels.
[0023] Preferably, the first high-isolation power supply unit (6) and the second high-isolation power supply unit (9) are both magnetic core transformers, which provide high-isolation and anti-interference power supply for the voltage and current acquisition channels, respectively, so that the circuit can work reliably and the anti-interference ability of the power measurement instrument is improved.
Claims
1. A high interference immunity power measuring instrument, characterized in that: It includes at least one power measurement module (1) and a central processing unit (2); the power measurement module (1) includes a voltage acquisition channel (3), a first fiber optic transmitter (4), a module processing unit (5), a first high-isolation power supply unit (6), a current acquisition channel (7), a second fiber optic transmitter (8), and a second high-isolation power supply unit (9); the first fiber optic transmitter (4) is connected to the voltage acquisition channel (3) and the module processing unit (5) respectively; the second fiber optic transmitter (8) is connected to the current acquisition channel (7) and the module processing unit (5) respectively; the module processing unit (5) is connected to the central processing unit (2). Unit (2) is connected; the first optical fiber transmitter unit (4) includes an optical fiber and two sets of optical fiber interfaces, one set of optical fiber interfaces is connected to the voltage acquisition channel (3), and the other set of optical fiber interfaces is connected to the module processing unit (5), and the two sets of optical fiber interfaces are connected through the optical fiber; the second optical fiber transmitter unit (8) includes an optical fiber and two sets of optical fiber interfaces, one set of optical fiber interfaces is connected to the current acquisition channel (7), and the other set of optical fiber interfaces is connected to the module processing unit (5), and the two sets of optical fiber interfaces are connected through the optical fiber; the first high isolation power supply unit (6) and the second high isolation power supply unit (9) are both magnetic core transformers.
2. The high interference immunity power measuring instrument according to claim 1, characterized in that: It also includes a display unit (10) for human-computer interaction; the display unit (10) is electrically connected to the central processing unit (2), and the display unit (10) is a touch-sensitive liquid crystal screen; the touch-sensitive liquid crystal screen has a transparent, openable and closable insulating protective cover.
3. The high interference immunity power measuring instrument according to claim 2, characterized in that: The voltage acquisition channel (3) includes a voltage signal acquisition component (11), a first ADC conversion component (12), and a first logic control component (13). The first ADC conversion component (12) is connected to the voltage signal acquisition component (11) and converts the analog signal acquired by the voltage signal acquisition component (11) into a digital signal, which is then output to the first fiber optic transmitter unit (4). The first logic control component (13) is connected to the voltage signal acquisition component (11). The current acquisition channel (7) includes a current signal acquisition component (14), a second ADC conversion component (15), and a second logic control component (16). The second ADC conversion component (15) is connected to the current signal acquisition component (14) and converts the analog signal acquired by the current signal acquisition component (14) into a digital signal, which is then output to the second fiber optic transmitter unit (8). The second logic control component (16) is connected to the current signal acquisition component (14).
4. The high interference immunity power measuring instrument according to claim 3, characterized in that: The voltage acquisition channel (3) and the current acquisition channel (7) have a slot for electrical isolation.
5. The high interference immunity power measuring instrument according to claim 2, characterized in that: It also includes a housing, on which the display unit (10) is located.
6. The high interference immunity power measuring instrument according to claim 5, characterized in that: It also includes a USB interface, which is located on the housing. An external mouse and keyboard are connected to the USB interface to control the instrument.