Patent ID: 7656623
Filing Date: 2010-02-02
Classification: G06F,H02J

Abstract:
1. A power manager unit for managing power delivered to a battery powered device, comprising: a main bus; an inrush current limiter, wherein the inrush current limiter limits current from a power line connected to the inrush current limiter; a voltage converter unit connected to the main bus and to the output of the inrush current limiter, and having a soft start capability such that an output voltage/current limit is slowly increased until reaching a set limit, preventing a voltage spike on the main bus when a power line is connected to the inrush current limiter, wherein the voltage converter unit is further configured to provide a constant charging current to a battery when connected to the battery; a voltage sensor unit coupled to the main bus and arranged to sense a voltage on the main bus; and a switchover circuit arranged to, upon connection of a power line to the inrush current limiter-causing the voltage sensor unit to sense a voltage on the main bus above a predefined threshold, connect the voltage converter unit to the battery powered device, and upon detection that the battery is in a fully charged state, disconnect the battery from the voltage converter unit such that no current flows to or from the battery.