Patent ID: 8922060
Filing Date: 2014-12-30
Classification: H02J,Y02E

Abstract:
1. Power supply apparatus comprising: a main power device and an auxiliary power unit each adapted to be connected to a DC supply line to be connected to a load device and configured to supply DC power to said load device through the DC supply line; load current measuring means configured to measure a current flowing through the DC supply line and output a measurement indicative of a magnitude of the measured current; judging means configured to, upon obtaining the measurement from said load current measuring means, judge whether or not the obtained measurement exceeds an optimal current magnitude; and controlling means, wherein said main power device is configured to generate the DC power supplied to the load device by use of power supplied from a secondary cell connected thereto, the optimal current magnitude being defined as a magnitude of a current supplied to the DC supply line from said main power device which operates so as to maximize a proportion of power supplied from said main power device to the DC supply line to the sum of power supplied from the secondary cell to said main power device and loss caused by an internal resistance of the secondary cell, said controlling means being configured to, upon acknowledging that said judging means determines that the measurement exceeds the optimal current magnitude, send an instruction to said main power device such that a magnitude of the current supplied from said main power device to the DC power line is identical to the optimal current magnitude, and said main power device including adjusting means configured to adjust the current supplied from said main power device to the DC supply line on the basis of the instruction received from said controlling means.