Power supply circuit, mobile terminals using the same, and control method of the same

Patent metadata

Field	Value
Publication number	US-8971077-B2
Application number	US-201313760732-A
Country	US
Kind code	B2
Filing date	Feb 6, 2013
Priority date	Mar 26, 2012
Publication date	Mar 3, 2015
Grant date	Mar 3, 2015

Abstract

A power supply circuit includes: a first switch and a second switch that are connected in series between an input voltage terminal and a reference power supply; a controller that controls the first and second switches to be turned on and off by turns; a comparator that has an inverting input terminal connected to a voltage supply and that has a non-inverting input terminal connected to a first terminal of a capacitor; a third switch that is provided between an output terminal and the non-inverting input terminal of the comparator; a fourth switch that is provided between a connection node of the first and second switches, and a second terminal of the capacitor; and a latch circuit that detects change of output of the output terminal of the comparator and controls the second switch to be turned off.

First claim

What is claimed is:

1. A power supply circuit comprising:
a first switch and a second switch that are connected in series between an input voltage terminal and a reference power supply;
a controller that controls the first and second switches to be turned on and off by turns;
a comparator that has an inverting input terminal connected to a voltage supply and that has a non-inverting input terminal connected to a first terminal of a capacitor;
a third switch that is provided…

Assignees

• Fujitsu Ltd

Inventors

• Nakamoto Hiroyuki

Classifications

• G05F1/468 Primary

  Physics · mapped topic

• H02M1/0058

  Electricity · mapped topic

• H02M1/0032

  Electricity · mapped topic

• Y02B70/10

  Cross-Sectional Technologies · mapped topic

• H02M3/158

  Electricity · mapped topic