According to one or more embodiments of the technical solutions described herein, an example method includes determining an input voltage (Vinv) of an inverter in a power circuit. The method further includes measuring an input current (Ii) of the inverter. The method further includes estimating a power supply current from a power supply of the power circuit based on the input voltage and the input current using a state observer and a plant model of the power circuit, the power supply current estimated at a non-steady state. The method further includes performing an active power management of a motor that receives electric power via the inverter.