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A device used to monitor the flow of electric current in a circuit is a current sensor, sometimes referred to as a current transducer or current probe. It enables the monitoring, management, and protection of electrical systems by generating an electrical output proportionate to the current flowing through it.
Power systems, renewable energy systems, industrial equipment, automotive systems, and electronic gadgets are just a few of the applications of current sensors. Through the provision of precise and dependable current measurements, they play a significant part in guaranteeing the secure and effective operation of these systems.
There are numerous modern sensor varieties, each with unique features and operating philosophies. Here are a few often employed types:
Hall effect sensors: Hall effect sensors make use of the phenomenon known as the Hall effect, which occurs when a conductor is exposed to a magnetic field that is perpendicular to the direction of current flow. These sensors detect the strength of the magnetic field produced by the current.
Alternating current (AC) is measured using current transformers (CTs), which are often utilized. They are made up of a magnetic core and two windings: a primary winding and a secondary winding.
The secondary winding produces an output current proportional to the primary current but scaled down for measurement while the primary winding is linked in series with the current-carrying wire.
Rogowski Coils: Rogowski coils are pliable current sensors that have an air-core coil wrapped around the conductor that carries the current. They are mostly employed for detecting AC currents and lack a magnetic core. The advantages of Rogowski coils include flexibility, a wide dynamic range, and simple installation.
Low-value resistors called shunt resistors are connected in series with the current route. Ohm’s Law (V = I * R) states that the voltage drop across a shunt resistor is inversely proportional to the current that passes through it. The current value can be calculated using this voltage, which can be monitored.
Hall Effect Sensors with a Closed Loop: For precise and linear current measurements, closed-loop Hall effect sensors combine the Hall effect with a feedback mechanism. They have low offset, low-temperature drift, and great precision.
The kind of current (AC or DC), its magnitude, the needed precision, the required response time, and the electrical properties of the system being monitored or controlled are all important considerations.
Engineers and technicians can monitor electrical currents, spot overcurrent situations, calculate power consumption, and ensure the proper operation and safety of electrical systems by employing current sensors.
The Europe Current Sensor Market accounted for $XX Billion in 2022 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2024 to 2030.
A new current sensor for high-power EV traction inverters is announced by LEM. High-power integrated traction inverters must, like all automotive components, combine excellent performance with being as tiny and light as possible in order to convert DC into AC and gather energy for the automobile.
In the cutthroat EV industry, distance and charging speed are essential factors. Compared to a traditional C-core sensor, the new HSTDR current sensor from LEM is significantly smaller and lighter, measuring only 29 mm by 21 mm by 12 mm and weighing only 27g.
As a result, integrating it into inverter boxes with limited space is made significantly easier. The sensor makes it possible for traction inverters to operate as efficiently as possible by combining high accuracy, affordability, and the capacity to function in difficult settings.
