| 摘要 |
PROBLEM TO BE SOLVED: To simultaneously perform preferable charge of a secondary cell and power supply to a load using only a simple circuit constitution and required minimum power supply capability. SOLUTION: This charger consists of a power supply device 1, and a charging portion 2 constituted of a charger 20, a current detecting resistor 21, and a voltage detector 22 to charge the secondary cell 3 and supply output voltage Vo to the load 4. The voltage detector 22 detects the load 4 and a voltage Vo of the secondary cell 3, and outputs a first voltage detecting signal V1 and a second voltage detecting signal V2 to the charger 20. The first voltage detecting signal V1 indicates a compared result between the output voltage Vo and a first prescribed voltage Vo1, and a second voltage detecting signal V2 indicates a compared result between the output voltage Vo and a second prescribed voltage Vo2. In this constitution, the first prescribed voltage Vo1 is set at a cell voltage at the time of full charge of the secondary cell 3, the second voltage detecting signal Vo2 is set to be lower than the first prescribed voltage Vo1 and higher than a driving lower limit voltage of the load 4. COPYRIGHT: (C)2006,JPO&NCIPI
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