Balanced core fluxgate DC current transducers for high precision measurement up to 10 MHz

Abstract:
For several decades, zero-flux current transducers have been used to extend the measuring range of power analysers. Common devices usually have a bandwidth in the three-digit kHz range. When using wide bandgap semiconductor modules, switching frequencies between 20 kHz and 100 kHz are widely used to generate sinusoidal current signals without heavy and expensive filter elements. Harmonics of the switching frequencies can be detected up to the megahertz range and provide active and reactive power components. This paper presents a zero-flux current transducer that can provide linear transmission behaviour up to 10 MHz.