US 11,901,764 B2
Power supply circuit and electronic device
Kinya Matsuda, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION
Filed by Seiko Epson Corporation, Tokyo (JP)
Filed on Feb. 25, 2022, as Appl. No. 17/680,603.
Claims priority of application No. 2021-029709 (JP), filed on Feb. 26, 2021.
Prior Publication US 2022/0278547 A1, Sep. 1, 2022
Int. Cl. H02J 9/06 (2006.01); H02J 7/00 (2006.01)
CPC H02J 9/061 (2013.01) [H02J 7/007 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A power supply circuit comprising:
a charge system circuit that charges a battery based on power received by a power receiving unit from an external power transmission device; and
a discharge system circuit that supplies power to a power supply target device based on a battery voltage from the battery, wherein
the discharge system circuit includes:
a power feeder circuit configured to perform a power supply operation to feed the power to the power supply target device based on the battery voltage, and the power supply operation includes a power-on state, in which the power supply operation is performed, and a power-off state, in which the power supply operation is stopped;
a discharge system control circuit configured to control the power feeder circuit;
a regulator configured to supply a regulated power supply voltage based on the battery voltage to the discharge system control circuit; and
a power-off setting circuit configured to:
set the power feeder circuit to the power-off state when the regulated power supply voltage is turned on by supplying the battery voltage from the battery to the regulator; and
release the power-off state after the power receiving unit starts receiving the power from the external power transmission device.