Patent ID: 7923861
Filing Date: 2011-04-12
Classification: B60L,B60W,Y02T

Abstract:
1. A method of controlling a hybrid DC power supply system including a first DC power supply device for generating a first output voltage and delivering a first source current (Ibse) flowing from the first DC power supply device or receiving a first sink current (Insk) flowing into the first DC power supply device; a second DC power supply device connected to a load, for delivering a second source current which increases as a second output voltage generated thereby decreases and which decreases as the second output voltage increases; and a voltage increasing/reducing DC/DC converter connected between the first DC power supply device and a junction between the load and the second DC power supply device, for controlling the second output voltage by increasing or reducing duty ratios for driving switching devices thereof, the method of controlling the hybrid DC power supply system including a first operation mode that limits the first source current and a second operation mode that limits the first sink current, the first operation mode comprising the steps of: controlling the hybrid DC power supply system such that a load sink current demanded by the load is the sum of a current converted from the first source current by the DC/DC converter and the second source current; and controlling the second output voltage of the second DC power supply device such that a value of a current flowing from an output point of the first DC power supply device through the DC/DC converter to the junction is less than or equal to a predetermined threshold value such that: