HOKA: a new isolated current measuring principle and its features

Abstract

The new current measuring principle HOKA is presented. Probes based on this principle can measure DC currents of several hundred amps, as well as di/dt's of several kA/ps. A measurement setup to generate these dVdt's as well as a current probe based on the HOKA principle were built. With the setup the current probe was tested and compared with other state of the art current probes.

Current Sensor Integration Issues with Wide-Bandgap Power Converters

“…Ultimately, the selection of a sensing arrangement should be based on the specific requirements of the application. Historically, hybrid configurations have been underutilized in a variety of power electronics applications, in which two single-scheme current-measurement methods are combined to compensate for their limited bandwidth [ 14 , 38 , 48 , 49 , 88 , 89 , 90 , 91 , 92 ]. Using hybrid (or dual-scheme) configurations can increase the accuracy, speed, and BW of a sensing system, which is especially beneficial in high-frequency applications as a single measurement method may not provide enough BW [ 14 ].…”

“… Bandwidth enhancement in dual-scheme current sensors ( a ) and Hoka principle of current sensing ( b ) [ 88 , 89 , 90 , 91 ]. …”

Hybrid torque sensing concept for high frequency and dynamic torque ripple measurements for brushless dc motors

“…A possible real time implementation is given by the HOKA principle [12]. In the HOKA principle, the signals of one sensor for the low-frequency and another sensor for the highfrequency part of its measurement signal are combined by low-pass and high-pass filters.…”

IGBT gate-drive with PCB Rogowski coil for improved short circuit detection and current turn-off capability

“…For determining the achievable accuracy for measured currents not flowing in the middle of the Rogowski coil, first the mutual inductance between each turn of the Rogowski coil and the loop, where the measured current is flowing, is calculated for each turn for the considered location of the measured current as described in [7]. The total mutual inductance is obtained by adding up the values for the individual turns.…”