Abstract: A mobile battery manager for charging or discharging a stored battery system may include a converter, a resistive load, and a controller configured to charge or discharge the stored battery system to a desired state of charge determined at the mobile battery manager.

Abstract: A battery manager for a battery is disclosed. The battery manager comprises a battery charger configured to provide a first output voltage in a first voltage range, a buck-boost direct current to direct current (DC to DC) converter switchably coupled to the battery charger, and a bypass line switchably coupled between the battery charger and the battery for bypassing the buck-boost DC to DC converter. The battery manager further comprises a controller configured to electrically route the first output voltage of the battery charger to the battery via the bypass line when a voltage requirement of the battery is within the first voltage range. The controller is further configured to electrically route the first output voltage of the battery charger to the battery via the buck-boost DC to DC converter when the voltage requirement of the battery is outside the first voltage range.

Abstract: A health signature of each switching device in a control system is estimated using system parameters such as a DC-link voltage, three-phase voltages, three-phase currents, and temperature. The switching devices can be implemented as transistors, and a health signature for each transistor may be an on-state resistance or an on-state voltage of the transistors. For example, the on-state resistance for a metal-oxide-semiconductor field-effect transistor (MOSFET) functions as a health signature. Alternatively, the on-state voltage is used as a health signature for an insulated-gate bipolar transistor (IGBT). Additionally, a junction temperature is estimated for each transistor. Using the estimated health signatures and the junction temperatures, the remaining useful life of each transistor is estimated.

Abstract: A health signature of each switching device in a control system is estimated using system parameters such as a DC-link voltage, three-phase voltages, three-phase currents, and temperature. The switching devices can be implemented as transistors, and a health signature for each transistor may be an on-state resistance or an on-state voltage of the transistors. For example, the on-state resistance for a metal-oxide-semiconductor field-effect transistor (MOSFET) functions as a health signature. Alternatively, the on-state voltage is used as a health signature for an insulated-gate bipolar transistor (IGBT). Additionally, a junction temperature is estimated for each transistor. Using the estimated health signatures and the junction temperatures, the remaining useful life of each transistor is estimated.

Abstract: A method for determining a capacitance value of a capacitor is provided. The method includes receiving a current signal flowing through the capacitor and receiving a voltage signal applied across the capacitor. The received voltage signal and the received current signal are filtered with a low pass filter. The filtered voltage signal and the filtered current signal are then discretized. The discretized voltage signal and the discretized current signal are transformed into a frequency domain. The capacitance value of the capacitor is determined from the transformed voltage signal and the transformed current signal.