Steering Solutions IP Holding Corporation

Aparna Saha

Prerit Pramod

Infane O Lowe

Nithin Kolli

Zhe Zhang

Krishna Mpk Namburi

Improvements to a power input circuit of an electric motor drive system are provided. The power input circuit is provided between a power source (e.g., battery), and a load (e.g., an inverter and a motor in the electric motor drive system). The power input circuit can comprise controllable switches for reverse polarity protection and isolation of the inverter under supply short circuit condition. In addition, an improvement to a power input circuit can comprise connection of a power supply (e.g., voltage regulator) to the external power source input side of a reverse polarity protection circuit in the power input circuit to mitigate against microcontroller restart from post-failure shutdown condition. Connection of a low-power diode in series with the voltage regulator also provides for reverse polarity protection.

Power input circuit for isolation under supply short circuit condition

Mitigation of microcontroller restart from post-failure shutdown condition

Systems and methods for compensating for a current measurement offset error in a permanent magnet synchronous motor (PMSM) drive are disclosed. The systems and methods include reading an output voltage command signal, extracting a signature of a current measurement offset error from the output voltage command signal, and compensating, based on the signature, for the current measurement offset error in a closed-loop using a feedback path.

Closed-loop compensation of current measurement offset errors in alternating current motor drives

According to one or more embodiments of the technical solutions described herein, an example method includes determining an input voltage (V) of an inverter in a power circuit. The method further includes measuring an input current (I) 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.

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Saginaw, MI, United States of America

Aparna Saha