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公开(公告)号：US20170353105A1
公开(公告)日：2017-12-07
申请号：US15610318
申请日：2017-05-31
发明人： Eric Magne SOLIE , Mehul SHAH , Bin LI , Paul K. SFERRAZZA
IPC分类号： H02M3/07
摘要： A method to soft start a charge pump circuit according to embodiments includes enabling switching for a plurality of power transistors, selecting a first switching control signal from a plurality of switching control signals for the selected plurality of power transistors, slowly ramping up a plurality of bootstrap supply voltages associated with the selected plurality of power transistors, driving a gate-to-source voltage of each power transistor of the selected plurality of power transistors at a first predefined level, and determining if the plurality of bootstrap supply voltages are less than a second predefined level. If the plurality of bootstrap supply voltages are less than the second predefined level, the method further includes toggling and thereby selecting a second switching control signal from the plurality of switching control signals for a second selected plurality of power transistors.
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公开(公告)号：US20180109134A1
公开(公告)日：2018-04-19
申请号：US15649233
申请日：2017-07-13
发明人： John CARPENTER , Mehul SHAH
CPC分类号： H02J9/061 , G06F1/263 , G06F1/28 , H02J7/345 , H02J2009/068
摘要： The present embodiments relate generally to methods and apparatuses for providing supplemental output voltage support in a battery charger. According to certain aspects, to provide supplemental power in a system with a weak battery and high current load, embodiments provide a trigger value to alert the system and a pre-trigger to allow saving current. Some embodiments use current information to predict the need for supplemental mode. These and other embodiments provide prepared biasing for faster response times, and are more precise than monitoring voltage alone. These and other embodiments further preferably provide support for providing supplemental system power while protecting attached external devices.
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