To provide a storage battery charging system capable of improving battery life while achieving space saving and cost reduction.
A storage battery charging system includes: a vibration power generating element 10 that outputs a first AC power; a power receiving unit 20 that outputs a second AC power as a wireless power supply; a first switch SW10 for selecting either of outputs of the vibration power generating element 10 and the power receiving unit 20; a rectifier circuit 30 that converts the first AC power or the second AC power supplied through the first switch SW10 into DC power; a storage battery 50 that stores DC power; and an authentication circuit 60 that authenticates whether the wireless power supply can be performed, and switches the first switch SW10 such that power is supplied from the power receiving unit 20 when the wireless power supply can be performed and such that power is supplied from the vibration power generating element 10 when the wireless power supply cannot be performed.
MIYANAGA KOICHI
Keishin Terayama
Hiroyuki Miyoshi
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