To provide a power supply circuit and a power supply apparatus which ensure a longer time period of use of a power-operated working machine when power from a battery is supplied as ac power to the power-operated working machine.
The power supply circuit includes a plurality of connection sections which are connected respectively to a plurality of batteries, a booster which raises a voltage output from at least any one of the plurality of batteries, a converting unit which converts the voltage raised by the booster into an ac voltage, an output unit which outputs the ac voltage converted by the converting unit to a power-operated working machine, and one or more of backflow preventing unit which prevent the backflow of current caused by a difference between output voltages between the batteries connected respectively to the connection sections.
TAKANO NOBUHIRO
NAKAYAMA EIJI
FUNABASHI KAZUHIKO
Johei Nakamura
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