Easily-installed current sensor made of magnetoelectric composite material

Abstract

The invention provides an easy-to-install current sensor adopting a magnetoelectric composite material, and belongs to the technical field of electronic detection equipment manufacturing. The current sensor comprises a bottom plate, one end of the top of the bottom plate is provided with a fixing frame, the fixing frame is slidably connected with a semi-magnetic ring A, the top of the bottom plate is provided with a semi-magnetic ring B opposite to the semi-magnetic ring A, and the semi-magnetic ring B is driven by a sliding block to be opened and closed with the semi-magnetic ring A. Multiple opening and closing operations can be carried out, complete closing of the magnetism gathering ring is not affected, and the measurement precision is guaranteed; No coil is arranged inside, so that measurement distortion caused by temperature rise can be eliminated; a distance-adjustable supporting mechanism is arranged at the bottom of the bottom plate, so that the applicability of the current sensor is improved; in addition, the current sensor belongs to a passive device, does not need additional bias voltage, and is wide in application range.

Description

technical field [0001] The invention relates to the technical field of electronic detection equipment manufacturing, and more specifically relates to an easy-to-install current sensor using a magnetoelectric composite material. Background technique [0002] Traditional current sensors mainly include shunts, current transformers, Hall current sensors and other devices. [0003] The shunt is a resistance element specially used for current measurement. It can measure DC and MHz-level alternating current; however, the shunt needs to be connected in series to the circuit when it is used, which belongs to contact measurement. On the one hand, the sensor is very difficult to install. Convenience affects the efficiency of use. On the other hand, since the shunt needs to be connected to the circuit for measurement, part of the power will be wasted in the form of heat due to the heating of the resistor, and it is difficult to guarantee personal safety. [0004] The current transforme...

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Problems solved by technology

[0003] The shunt is a resistance element specially used for current measurement. It can measure DC and MHz-level alternating current; however, the shunt needs to be connected in series to the circuit when it is used, which belongs to contact measurement. On the one hand, the sensor is very difficult to install. Convenience affects the efficiency of use. On the other hand, since the shunt needs to be connected to the circuit for measurement, part of the power will be consumed in the form of heat due to the heating of the resistor, and it is difficult to guarantee personal safety.

[0004] The current transformer is generally composed of a closed soft magnetic core and a surrounding winding coil, which can convert the primary current with a large value into a secondary current with a small value through the coil turns ratio and transmit it to the secondary equipment for measurement; but The current transformer can only measure alternating current, and it will be saturated under a lower magnetic field, and the measurement range is small; in addition, due to the existence of the coil, long-term work will cause measurement distortion due to the heating of the coil

Most transformers adopt a closed structure. When installing, one end of the wire to be tested needs to be passed through the center hole of the sensor in advance. This cannot be measured for wires that have been connected to other devices at both ends. The sensor is also inconvenient

[0005] The Hall-type current sensor is to put the Hall element into the open soft magnetic core to achieve the purpose of current detection. The Hall element detects the magnetic flux proportional to the primary current in the magnetic circuit and outputs the Hall voltage signal. After being amplified by the amplifier circuit, it is sent to the instrument display or computer acquisition; however, the Hall element is an active device, and a bias voltage must be added to ensure its normal operation during use, which greatly limits its scope of application.

[0006] Most sensors have two installation holes, and the distance between the two installation holes remains unchanged, which also puts forward higher position requirements for the holes on the base; there are also sensors with a split structure on the market, but It is difficult for this type of sensor to ensure the complete closure of the magnetic gathering ring after repeated opening and closing

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