MULTIPLE POWER CHARGERS FOR MOBILE TERMINALS

摘要

Multiple power chargers for mobile terminals are disclosed. In particularly contemplated aspects, a mobile terminal may include two charging circuits arranged serially, such that only one charging circuit charges a battery of the mobile terminal at a time. The serial arrangement allows consolidation of fuel gauge circuitry within one of the charging circuits. In a particularly contemplated aspect, a second charger is tied to a first charger at a system power node. The system power node is further tied to a top port of the second charger. A bottom port of the second charger is tied to a top port of the first charger. A bottom port of the first charger is tied to the battery of the mobile terminal. The fuel gauge circuitry may sense battery current using a known ON resistance of a field effect transistor (FET) of the first charger.

主权项

1. A charging system comprising:
a first charger comprising:
a first power output tied to a system power node;a first top port;a first bottom port; anda fuel gauge circuit tied to the first top port; and a second charger comprising:
a second power output tied to the system power node;a second top port tied to the system power node; anda second bottom port tied to the first top port of the first charger.