Circuit for sensing motor load current

摘要

A current sensing circuit comprises a resistor RShunt suitable for coupling to a load supply arrangement such that the voltage across the resistor is proportional to the current delivered to the said load. The voltage signal across the resistor is processed via circuitry for adjusting the voltage signal relative to a reference signal such that the resulting voltage signal may be used as a feedback signal to control the commutation of a converter device. The current sensing resistor Rshunt may be located in the converter device with one end connected to a junction between a high-side switching device and a low-side switching device of a half bridge arrangement and the other end being connected to the load. Analog or digital circuitry arrangements may be employed for processing the voltage signal.