Patent ID: 8880912
Filing Date: 2014-11-04
Classification: H02J,Y02B,Y04S

Abstract:
1. A power supply device, comprising: a main power supply unit that generates predetermined power from power supplied from an external source, and supplies the generated predetermined power to an electric load; a current detecting unit that detects a load current value of a load current that flows to the electric load; a current indicating unit that compares the load current value with a predetermined upper limit current value, and outputs a current value indication signal that indicates a difference current value that corresponds to a surplus of the load current value relative to the upper limit current value; an electric storage unit that stores the power supplied from the external source; an auxiliary power supply unit that generates constant-current power from the power stored in the electric storage unit, and supplies the generated constant-current power to the electric load, the constant-current power adopting the difference current value indicated by the current value indication signal as a set current value; and a control unit that determines the upper limit current value to be output to the current indicating unit on the basis of at least a condition of the electric load, and controls the upper limit current value such that power supplied from the auxiliary power supply unit to the electric load is converged gradually in a predetermined convergence time when the power supply from the auxiliary power supply unit to the electric load is stopped or reduced.