Resonant current sensor for PCB current measurement

Abstract

The invention discloses a resonant current sensor used for PCB current measurement. The sensor comprises two resonant current sensitive units, two permanent magnets, a ceramic vacuum packaging shell and a PCB. The resonant current sensitive unit and the two permanent magnets are packaged in the ceramic vacuum shell. The permanent magnets are arranged between the two resonant current sensitive units. Each resonant current sensitive unit comprises a high-Q-value resonator and a magnetostriction unit. The magnetostriction unit is arranged on the lower side of the high-Q-value resonator, and the permanent magnets are arranged in a way that magnetic lines of force are emitted by the N poles of the permanent magnets and return to the S pole of the other permanent magnet through the magnetostriction unit to form a closed magnetic loop. According to the invention, an XOR frequency mixing differential output mode is adopted, and the sensor has the characteristics of high sensitivity, effectiveinhibition of temperature drift and strong anti-interference capability.

Description

technical field [0001] The invention belongs to sensor technology, in particular to a resonant current sensor used for PCB current measurement. Background technique [0002] In power electronic systems, current sensing technology is the most widely used sensing and measurement technology. Printed circuit board (PCB), as one of the most basic and active industries in the electronics industry, has developed rapidly, and with the increasing development of semiconductor design and manufacturing technology, printed circuit boards are also moving towards ultra-thin, high-density, multi-layer Number, high performance and other directions of development. However, while achieving rapid development, the PCB industry is also facing a huge challenge, which is the quality of PCB. Due to many uncertain factors between the current trace, the integrated circuit and various components on the circuit board, PCB faults will occur. If the faults are not eliminated in time, hidden dangers will...

AI Technical Summary

Problems solved by technology

These types of current sensors also have some application limitations, such as the low accuracy of the Hall current sensor, the high measurement accuracy of the fluxgate current sensor but the high price, and the thermal drift of the giant magnetoresistive current sensor has a great impact on the accuracy of the sensor.

The output of these current sensors is a weak analog signal, and complex circuits and methods such as low-noise signal amplifiers, filters, A / D converters, and digital signal processors are required to process the sensing signals, which limits its scope of use.

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