A kind of AC and DC current sensor

Abstract

The invention relates to an alternating current / direct current sensor. The alternating current / direct current sensor comprises a high-permeability transformer unit, an excitation signal generation unit, a direct current signal detection unit, a restoring circuit unit, an alternating current signal processing unit and a power amplification unit. The high-permeability transformer unit comprises a first magnetic core, a second magnetic core, a first magnet exciting coil, a second magnet exciting coil, a third magnetic core, a primary coil, a secondary coil and an auxiliary coil, wherein the first magnetic core and the second magnetic core are independent of each other; the first magnet exciting coil and the second magnet exciting coil are wound around the first magnetic core and the second magnetic core respectively; the third magnetic core, the first magnetic core and the second magnetic core are overlapped so as to form an integrated magnetic core; the primary coil, the secondary coil and the auxiliary coil are wound around the integrated magnetic core. The performance of the alternating current / direct current sensor is improved remarkably. The alternating current / direct current sensor has the advantages of being low in power dissipation, high in magnetic disturbance resistance capacity, simple in structure, light, high in response speed, high in flexibility, good in interchangeability, convenient to install, calibrate, adjust and maintain, and the like.

Description

technical field [0001] The invention relates to an AC and DC current sensor. Background technique [0002] Accurate detection and control of DC current in DC transmission system, frequency conversion speed control device, UPS power supply, inverter welding machine, electrolytic plating, CNC machine tool, microcomputer monitoring system, accelerator operation, power grid monitoring system and in various fields that require isolation and detection of current , is the fundamental guarantee for the safe and reliable operation of the equipment and the first problem to be solved. [0003] At present, the means for measuring current include: current measuring methods and equipment such as current comparators, AC transformers, DC transformers, shunts, etc. The above equipment with different specifications can be found in the market. However, the equipment based on the above-mentioned current measurement method often shows many deficiencies in high-precision and wide-range current m...

AI Technical Summary

Problems solved by technology

However, magnetic amplifiers are limited in their miniaturization and high-precision measurement applications due to their complex and bulky structures.

The common magnetic modulators include single magnetic core and double magnetic core. The traditional magnetic modulation current detection requires that the two magnetic cores must have the same structural size and completely consistent magnetic characteristics, and the open-loop characteristic curve of the magnetic modulator is easy. A false balance point appears, which reduces the reliability of the operation of the magnetic modulator, thus limiting the application and promotion of the magnetic modulator

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