Patent ID: 7839119
Filing Date: 2010-11-23
Classification: H02J

Abstract:
1. A charging device for a portable phone battery for charging a rechargeable battery housed in a portable phone comprising: a first charging section to charge said rechargeable battery housed in the portable phone; and a second charging section to charge a lithium-ion battery built in said first charging section; wherein said first charging section comprises: an input terminal connected to said second charging section; said lithium-ion battery connected to said input terminal via a protecting circuit; a boosting-type DC/DC (Direct Current/Direct Current) converter to boost a voltage output from said lithium-ion battery; a current limiting circuit to control a direct current fed from said boosting-type DC/DC converter and to prevent flowing of currents exceeding currents required for an activation of a current protecting circuit in the portable phone; an output connector connected to said current limiting circuit and to have an electrode to supply a direct current voltage and direct current fed from said boosting-type DC/DC converter to a charging circuit of the portable phone; and a control circuit to switch on-off said boosting-type DC/DC converter and said current limiting circuit; wherein said second charging section comprises an AC (Alternating Current) adaptor connector to be used for charging said portable phone and connected to an AC adaptor to convert an alternating current into a direct current having a predetermined voltage and current; a charging circuit to charge said lithium-ion battery by using a direct current voltage and direct current fed from said AC adaptor as inputs at constant current and voltage methods; a current backflow preventing circuit connected to an input side of said charging circuit; an output terminal connected to said first charging section used to charge said lithium-ion battery by using said charging circuit; and an output connector to output a direct current voltage and direct current fed from said AC adaptor; and wherein said second charging section and said first charging section are freely detachable and attachable from or to each other and are disconnected from each other.