| 摘要 |
PROBLEM TO BE SOLVED: To reduce charging power loss, and to supply electric power to a load stably and effectively from an input source the output voltage of which fluctuates sharply without decreasing the lifetime of a storage battery. SOLUTION: This power supply which charges the storage battery using the input source, the output voltage of which fluctuates sharply, is provided with a power directly feeding circuit that is turned on in a low resistance state until a voltage of the storage battery reaches a preset upper limit value, supplies the output electric power of the input source to the storage battery, and is turned off when the voltage of the storage battery reaches the upper limit value; a voltage-boost/step-down converter composed of a voltage-boost portion that is operated when the voltage of the storage battery reaches the upper limit value and that boosts the voltage from the input source and a step-down portion that lowers the output voltage of the voltage-boost portion to hold the voltage of the storage battery to the upper limit value; and a control device that turns on and off the power direct feeding circuit and controls the operation of the voltage-boost/step-down converter. COPYRIGHT: (C)2005,JPO&NCIPI
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