Abstract: Disclosed is an apparatus and method for determining incomplete opening/closing of a sub-body of a mobile terminal due to overload when a user automatically opens/closes the sub-body, by means of an open sensor and a close sensor, and for controlling operation of the sub-body during overload condition.

Abstract: A power control apparatus in a foldable portable radio terminal which includes a main body, a sub-body, a key-pad including a power key on the main body, an external function key which can be key-input by a user even if the sub-body is shut on the main body is disclosed. The power control apparatus includes a first switch, a second switch, and a control unit for controlling the first and second switch according to powered-on/off state of the terminal. One end of each of the first and second switch is connected in common at a first node connected to the external function key and the other end of the first switch is connected to a first input end of the control unit, and the other end of the second switch and the power key are connected in common via a second node connected to a second input end of the control unit.

Abstract: Disclosed is a circuit and method for preventing erroneous opening and closing caused particularly, by use of a DC motor in an automatically/manually foldable portable radio terminal having a main body and a sub-body rotatable with respect to the main body. In the circuit, a motor provides rotating force to automatically raise or lower the sub-body, a motor driver drives the motor according to a motor driving direction control signal, an inverse electromotive force eliminator eliminates inverse electromotive force by opening or shorting both terminals of the motor according to an automatic mode or a manual mode, and a motor power controller controls supplying a driving power voltage to the motor. In the method of operating a folder, it is determined whether an automatic folder operation key has been pressed. Upon receipt of the automatic folder operation key input, a rectifier is turned on to open both terminals of a motor. At the end of the opening of the motor terminals, the motor is driven.