Patent ID: 7868593
Filing Date: 2011-01-11
Classification: H02J

Abstract:
1. A charging circuit of a portable device, comprising: a switch circuit having an input connected to a storage battery of the portable device for triggering the storage battery to supply power to an electronic device; a reference voltage circuit; a regulating circuit; a filter circuit filtering voltage signals from the storage battery; a collecting circuit; a comparator circuit; a rectangular wave generator; an integral circuit; and a driving circuit, an output of the switch circuit connected to outputs of the comparator circuit, the filter circuit, and the integral circuit respectively via the reference voltage circuit, the regulating circuit, and the rectangular wave generator, an output of the filter circuit configured for connecting to the electronic device and connected to an input of the comparator circuit via the collecting circuit, outputs of the comparator circuit and the integral circuit connected to inputs of the driving circuit, an output of the driving circuit connected to the regulating circuit, the reference voltage circuit and the collecting circuit respectively outputting a reference voltage signal and a collecting voltage signal to the comparator circuit, The rectangular wave generator outputting a rectangular wave to the integral circuit, the integral circuit outputting a triangle wave signal to the driving circuit, the driving circuit outputting a pulse width modulation (PWM) signal to drive the regulating circuit to charge the electronic device.