Patent ID: 9190908
Filing Date: 2015-11-17
Classification: H02J,H02M

Abstract:
1. A protection cover allowing a handheld device to reversely discharge, the handheld device comprising a charging connector and a rechargeable battery electrically connected to each other, the protection cover comprising: a counterpart charging connector, which is electrically connectable to the charging connector of the handheld device; a protection cover battery, which is a rechargeable/dischargeable battery; a first connector; a bidirectional DC-DC converter, which comprises a DC-DC buck-boost circuit module; a charging/discharging controller, which comprises an overload protection circuit module, the charging/discharging controller being electrically connected to the bidirectional DC-DC converter, the first connector and the bidirectional DC-DC converter being electrically connected to a positive terminal of the protection cover battery, the charging/discharging controller being electrically connected through the counterpart charging connector to a negative terminal of the protection cover battery; a second connector, which is electrically connected to the bidirectional DC-DC converter; and a charging/discharging selection switch, which is electrically connected to the charging/discharging controller, whereby through selection made through the charging/discharging selection switch, the charging/discharging controller controls either one of the protection cover battery and the rechargeable battery to perform external discharging to a handheld device through the bidirectional DC-DC converter, the charging/discharging controller alternatively controlling the protection cover battery to perform internal charging to the rechargeable battery via the bidirectional DC-DC converter.