Power supply control device, switching power supply, and electronic apparatus
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United States of America Patent
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Sep 6, 2022
Grant Date -
Sep 24, 2020
app pub date -
Mar 20, 2020
filing date -
Mar 22, 2019
priority date (Note) -
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Abstract
A power supply control device includes a charge circuit, a detection circuit, and a charge control circuit. The charge circuit charges a capacitor coupled to a power supply voltage node based on a full-wave rectified voltage. The charge control circuit enables a charge mode of the charge circuit when the detection circuit detects that a power supply voltage is less than a first threshold voltage. The charge control circuit disables the charge mode when the detection circuit detects that the power supply voltage reached a second threshold voltage. The charge control circuit sets a charge capacity of the charge circuit in a second charge mode period according to a length of a first charge mode period.
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