发明名称 |
Power supply circuit, mobile terminals using the same, and control method of the same |
摘要 |
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. |
申请公布号 |
US8971077(B2) |
申请公布日期 |
2015.03.03 |
申请号 |
US201313760732 |
申请日期 |
2013.02.06 |
申请人 |
Fujitsu Limited |
发明人 |
Nakamoto Hiroyuki |
分类号 |
H02M3/156;G05F1/46 |
主分类号 |
H02M3/156 |
代理机构 |
Arent Fox LLP |
代理人 |
Arent Fox LLP |
主权项 |
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 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. |
地址 |
Kawasaki JP |