Open-type current transducer and control method thereof

Abstract

The invention discloses an open-type current transducer and a control method thereof. The open-type current transducer comprises a closed-loop control module and an exciting module; the exciting module comprises an exciting vibrator, an exciting unit connected with the exciting vibrator, and a direct current magnetic bias detection unit which is connected with the exciting unit; a fluxgate technology is adopted for the exciting module, and direct current magnetic bias signals are output through a magnetic modulation technology; the exciting vibrator outputs alternating voltage signals with a preset frequency to the exciting unit to excite the exciting unit to generate a target exciting magnetic field, the target exciting magnetic field is used for detecting a direct current bias magnetic field generated by to-be-tested current in a to-be-tested circuit, and outputting the direct current magnetic bias signals corresponding to the direct current bias magnetic field through the direct current magnetic bias detection unit, and the closed-loop control module is connected with the direct current magnetic bias detection unit. According to the open-type current transducer and the control method thereof, alternating current and direct current are precisely detected, and the current detection precision of the open-type current transducer is improved.

Description

technical field [0001] The invention relates to the technical field of current detection, in particular to an open-type current sensor and a control method thereof. Background technique [0002] A current sensor is a sensor that can sense the current to be measured, convert large current or micro current into small current and voltage signals that are easy to measure, and isolate and output analog or digital signals. [0003] According to the requirements of different application scenarios, current sensors include closed current sensors and open current sensors. The closed current sensor has high measurement accuracy, but it is inconvenient to install; the open current sensor can be operated with electricity and is easy to install, but the accuracy is not high. At present, the open current sensors on the market mainly include Hall current sensors and Rogowski coils. Hall sensors can measure DC and AC currents, but due to relatively large zero drift and temperature drift, h...

AI Technical Summary

Problems solved by technology

Hall sensors can measure DC and AC currents, but due to the relatively large zero drift and temperature drift, high-precision measurement cannot be achieved

The Rogowski coil is easy to install and has a wide measurement range, but it can only measure AC. It is not sensitive enough to low-frequency current signals and has high requirements for post-processing circuits.

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