Скачать или смотреть How to measure DC current (high-precision current detection sensor)

Dc current detection methods are generally divided into direct type and indirect type, direct type is generally through the series resistance to detect voltage method; Indirect measurement is generally achieved by detecting the magnetic field generated by the current. Since the magnetic field is generated around the current, we can indirectly measure the size of the measured current by measuring the size of the magnetic field. Direct measurement mainly refers to the shunt; Indirect measurement mainly includes Hall current sensor and DC current transformer, the following will mainly introduce the principle and application of these DC current detection methods.

How to measure DC current
shunt
The shunt is a direct measurement method based on the principle of voltage at both ends of a resistor. It has the advantages of high precision, simple structure and low cost. However, the shunt has high requirements for measuring resistance and signal amplification circuit, and the problems of temperature drift and loss of large current limit its application.

Application scenario: Applicable when the voltage is low and the current is relatively small.

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