Patent ID: 8593084
Filing Date: 2013-11-26
Classification: B60L,B62D,H02P,Y02T

Abstract:
1. An auxiliary power supply device comprising: an auxiliary power source connected in series to a battery for supplying electric power to a motor; a power detecting section that detects power consumption of the battery; a charging circuit that charges the auxiliary power source by using the battery; a discharge circuit that selectively constitutes a first state where the motor is supplied with electric power from only the battery and a second state where the motor is supplied with electric power from both the battery and the auxiliary power source by turning on and off a switching element; and a control circuit that performs an electric power feedback control of turning on and off the switching element by a pulse width modulation control with a duty based on a difference between the power consumption detected by the power detecting section and a first threshold value, wherein when the power consumption is greater than the first threshold value, the control circuit performs the electric power feedback control with the duty based on the difference so that the power consumption returns to the first threshold value.