High-Performance Electronic Hall Effect Current Sensor Company
Vicorv, a company specializing in high-performance electronic Hall effect current sensors, offers a variety of sensors for monitoring AC or DC current across industrial, automotive, and household applications. Below, Vicorv introduces several methods of current sensing:
DC Sensing Electronic Hall Effect Current Sensors:DC sensing relies on Ohm's Law. By arranging parallel resistors with the system load, a voltage proportional to the system load current is produced across the parallel resistors. The voltage across the branches can be measured using a differential amplifier, such as a current shunt amplifier, operational amplifier, or differential amplifier. This method is typically used for load currents <100A.
Indirect Current Sensing with Electronic Hall Effect Sensors:Indirect current sensing depends on Ampère's Law and Faraday's Law. By placing a loop around the current-carrying conductor, a voltage proportional to the current is induced in the loop. This method is suitable for load currents between 100A and 1000A.
Low-Side Current Sensing:This involves low input common-mode voltage. Low-side current sensing connects an sensing resistor between the load and ground. It is preferable because the common-mode voltage is close to ground, considering the use of a single power supply and rail-to-rail input/output operational amplifiers. The load is powered by a single supply, and the resistor is grounded. However, the downside of low-side sensing is its interference with the system load's ground potential and its inability to detect load short circuits.
High-Side Current Sensing:High-side current sensing connects an sensing resistor between the power supply and the load. It is advantageous because it directly monitors the current supplied by the power source, taking into account the identification of load short circuits. The amplifier's input common-mode voltage range must accommodate the load supply voltage. The output is then measured through the current sensing device, with the load grounded.
Current Transformers (CT):Current transformers (CT) are used to measure current and are widely recognized sensors in today's high-current solid-state energy meters. They can measure extremely high currents with minimal power consumption. CTs are also very useful in measuring or monitoring high-current, high-voltage, and high-power circuits. They are used in various power systems, including power supplies, motor control, and lighting control.