| 摘要 |
A power system the size of which does not become very large although the system uses secondary batteries, and in which the supply of DC power is not stopped at the time of charging the battery after the secondary battery is completely discharged, and an amplification system for audio using the power system. When no signal is inputted to an amplifier (1) for audio for a fixed period of time or longer, a control circuit (4) gives a connection switching signal (b) to a connection switching circuit (7) under a fixed condition, but, whenever the signal (b) is given to the circuit (7), one of the secondary batteries (6A and 6B) is switched to the power source of the amplifier (1) from a state where the battery is charged by means of a charging circuit (8), and the other battery is switched to a state where the battery is charged by means of the circuit (8) from a state where the battery supplies electric power to the amplifier (1).
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