Wide-current-change-range current sampling circuit structure and device
A technology of current sampling and circuit structure, which is applied in the direction of measuring current/voltage, measuring device, and only measuring current, etc. It can solve the problems of narrow current sampling range and inability to work, achieve satisfactory measurement accuracy, reduce internal errors, and expand current measurement range effect
Pending Publication Date: 2020-07-28
HANGZHOU MINGTE TECH
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Problems solved by technology
[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a current sampling circuit structure and device, which is used to solve the problem that the current domestic electric energy meter has a narrow sampling range and cannot work in a wide current range, and realizes This ensures that the same electric energy meter can work under a large current signal, and the measurement accuracy of the sampling current under a small current signal meets the requirements of the current measurement accuracy of the electric energy meter in the IEC or ANSI standard
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Embodiment 1
[0036] see figure 1 , the present invention provides a current sampling circuit structure, including an electromagnetic transformer 11 and a secondary side active circuit 12 .
[0037] see figure 2 , figure 2 A specific structure of a current sampling circuit is provided for the present invention. The type of the current transformer 11 is not limited, and may be a common current transformer, including an iron core, a primary winding and two secondary windings wound on the iron core. The primary winding 112 of the current transformer is connected to the external circuit under test, and the external circuit under test inputs the primary side current signal in the primary side winding 112; the two secondary side windings are respectively the secondary detection winding 113 and the secondary measurement winding 114. Realize circuit connection through the secondary-side active circuit 12. The detection winding 113 performs small current sampling on the input current in the pr...
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The invention provides a wide-current-change-range current sampling circuit structure and a device. The structure comprises a current transformer and a secondary side active circuit; the secondary side active circuit comprises a protection module, a signal amplification module, an adjustment detection module and a filtering module; and the structure can be used in an electric energy meter samplingcircuit for inputting current in a wide change range. With the structure and the device of the invention adopted, the problem that the calibration current range of an existing electric energy meter is small is solved, the application range of the electric energy meter is greatly expanded, and the measurement precision of the electric energy meter sampling circuit is effectively improved.
Description
technical field [0001] The invention belongs to the technical field of power supply circuits, and relates to a sampling circuit structure, in particular to a current sampling circuit structure and device. Background technique [0002] In recent years, the global demand for smart energy meters has been increasing, and the number of energy meters exported to Europe, Southeast Asia and other regions in my country has also increased year by year. At present, the calibration current of three-phase electric energy meters commonly used in China is 1 (10) A for small current specifications, and 20 (200) A for high current specifications, and the current measurement accuracy of electric energy meters with different calibration specifications is different, that is, the large calibration current The measurement accuracy of the electric energy meter cannot meet the requirements of the small calibration current electric energy meter. Therefore, the large calibrated current electric ener...
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IPC IPC(8): G01R19/00G01R35/04
CPCG01R19/0092G01R35/04
Inventor 王政张方勇陈江涛郑亮亮朱子凡应焯萍沈清影
Owner HANGZHOU MINGTE TECH