| 摘要 |
A bicycle electric power device includes a dynamo, an electrical device, a power source and a switch. The electrical device is electrically connected to the dynamo. The power source is electrically connected to the dynamo in parallel with the electrical device and configured to chargeably connect to the dynamo. The switch is connected in series with the power source and configured to controllably connect the power source to the dynamo with the dynamo producing no power of its own such that with the switch closed the dynamo is charged by the power source and with the switch opened the dynamo provides boosted voltage to the bicycle electrical device.
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