Patent ID: 8127874
Filing Date: 2012-03-06
Classification: B60K,B60L,B60W,H02J,Y02T

Abstract:
1. A power supply device constructed to input and output electric power, the power supply device comprising: an accumulator designed to be chargeable and dischargeable; a temperature sensor constructed to measure temperature of the accumulator; a charge-discharge current meter constructed to measure a charge-discharge current to be charged into or discharged from the accumulator; a state-of-charge calculator configured to compute a state of charge as an indication of an amount of electric power dischargeable from the accumulator, based on the measured charge-discharge current; an input limit setter configured to set a basic input limit, as a maximum allowable electric power to be charged into the accumulator, according to the computed state of charge and the measured temperature, correct the set basic input limit based on the measured charge-discharge current, and set the corrected basic input limit to an effective input limit; an output limit setter configured to set an effective output limit, as a maximum allowable electric power to be discharged from the accumulator, according to the computed state of charge and the measured temperature; and a square current calculator configured to compute a time average of square values of the measured charge-discharge current.