A Passive $\frac{dv}{dt}$ Filter for Integrated Induction Motor Drive Fed from 3-Phase 2-Level GaN Based Inverter

In recent times, the Si-IGBT switches are being replaced by the WBG devices (SiC, GaN) in the next gen EV drive train as the WBG devices exhibit inherent advantages like higher switching frequency, better efficeincy as compared to Si-IGBTs. On the other hand, between SiC MOSFETs and GaN, the GaN exhibits superior performance when compared with SiC in terms of efficiency. Moreover, GaN is found to be smaller size as compared to SiC. Because of these advantages, GaN is being used widely in next gen EV drive drain as the switchingdevice of inverter. However, this GaN devices exhibit higher <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\frac{d v}{d t}$</tex> at the inverter terminal (approximately 40 V/ns) and because of that uneven distribution of voltage occurs in the motor windings. As a result, the life span of motor winding is degraded. To overcome this problem, passive <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\frac{dv}{dt}$</tex> filter is used. On the other hand, the loading effect of motor impedance is not considered while designing the passive <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\frac{dv}{dt}$</tex> filter. As a result, the accuracy in the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\frac{dv}{dt}$</tex> at the motor terminal is missed. In this paper, a novel passive LC based <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\frac{dv}{dt}$</tex> filter designing algorithm is proposed considering the loading effect of motor impedance. The <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\frac{dv}{dt}$</tex> at the motor terminal is maintained at 0.5 V/ns. The propose-passive <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\frac{dv}{dt}$</tex> filter is applied on a 120 V, 2.2 kW induction motor. The simulation and experimental results illustrate the accuracy in designing LC based <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\frac{dv}{dt}$</tex> filter.