Patent ID: 8836286

Claim:
A storage battery charge circuit for charging a storage battery, the storage battery charging circuit comprising: a control signal output circuit comprising: a voltage input port for being connected to a power source to receive a logic high level voltage; and a converting circuit connected to the voltage input port to convert the received logic high level voltage into a control signal comprising a logic high level voltage and a logic low level voltage alternately, a mark space ratio of the control signal being greater than one or less than one, the converting circuit further to output the control signal through a signal output port; and a charge circuit connected to the signal output port to charge and discharge the storage battery alternately according to the control signal; wherein when the mark space ratio of the control signal is greater than one, a duration of the logic high level voltage of the control signal is greater than a duration of the logic low level voltage of the control signal, while charging the storage battery, when receiving the logic high level voltage of the control signal, the charge circuit charges the storage battery, and when receiving the logic low level voltage of the control signal, the charge circuit charges the storage battery reversely to cause the storage battery to be discharged.