Patent ID: 7405539
Filing Date: 2008-07-29
Classification: H02J

Abstract:
1. A battery charger for charging a battery, comprising: a charging regulation circuit having an input terminal, a control terminal, and an output terminal, wherein the input terminal is for being coupled to a power supplier, the output terminal is coupled to a node N a first current sensing unit having a first and a second input terminals and a first and a second output terminals, wherein the first input terminal is coupled to the node N an operational amplifier having a positive input terminal coupled to the node N a comparator for comparing a second reference signal with the voltage of the node N a first switch unit for electrically coupling the second output terminal of the first current sensing unit to the node N a second switch unit for electrically coupling the output terminal of the operational amplifier to the node N a third switch unit for electrically coupling the comparator to the second reference signal when the enabling signal is active, or for electrically coupling the comparator to the node N a reference voltage generator having an input terminal coupled to the node N wherein the voltage at the node N