Patent ID: 6362611
Filing Date: 2002-03-26
Classification: G04C,H02J,Y02B

Abstract:
An electronic portable appliance, comprising:power feed means for supplying electric power; power storing means for storing electric power of the power feed means; a drive circuit connected to be driven by one of electric power of the power feed means and electric power stored on the power storing means; switch means provided on a charging path to charge power of the power feed means to the power storing means; and a control circuit provided to compare voltages on a charging path at forward and rear points of the switch means; wherein the control circuit turns on the switch means to charge electric power of the power feed means to the power storing means when detecting higher is a voltage on the charging path at the forward point of the switch means, and turns off the switch means to prevent storage power from reversely flowing from the power storing means to the power feed means when detecting lower is a voltage on the charging path at the forward point of the switch means.