Abstract
This paper presents a current sensing principle appropriate for use in power electronics’ converters. This current measurement principle has been developed for metal oxide semiconductor field effect transistor (MOS-FET) and is based on voltage measurement. In practice, shunt resistors and Hall effect sensors are usually used for these purposes, but the presented principle has many advantages. There is no need for additional circuit elements within high current paths, causing parasitic inductances and increased production complexity. The temperature dependence of MOS-FETs conductive resistance is considered in order to achieve the appropriate measurement accuracy. The “MOS-FET sensor” is also accompanied by a signal acquisition electronics circuit with an appropriate frequency bandwidth. The obtained analogue signal is therefore interposed to an A-D converter for further data acquisition. In order to achieve sufficient accuracy, a temperature compensation and appropriate approximation is used (). The MOS-FET sensor is calibrated according to a reference sensor based on the Hall-effect principle. The program algorithm is executed on 32-bit ARM M4 MCU, STM32F407.
Highlights
There has been significant interest in any kind of power electronics’ converters for using current sensors for current control purposes [1,2,3]
The shunt measurement principle reduces the costs of power electronic converters, whilst those sensors based on the magnetic principle are relatively expensive
This paper proposes an algorithm for using the metal oxide semiconductor field effect transistor (MOS-FET) resistance RDS−ON for current measurement purposes in a power converter circuit
Summary
There has been significant interest in any kind of power electronics’ converters for using current sensors for current control purposes [1,2,3]. The more frequently-used current measurement principles in power electronics’ converter applications are based on the magnetic principle and/or voltage measurement on a shunt resistor. Both of them must be equipped with appropriate analogue signal acquisition electronic circuits. High currents, flowing through shunt resistors, causes additional power losses. The shunt measurement principle reduces the costs of power electronic converters, whilst those sensors based on the magnetic principle are relatively expensive. Based on the shunt resistor principle, MOS-FETs (basic elements in power converters) can be used as current sensors
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