BATTERY EXCHANGE DEVICE OF PORTABLE TERMINAL, CAPABLE OF MINIMIZING POWER NOISE AND VOLTAGE INSTABILITY BY PERMITTING TIME OVERLAPPING BETWEEN MAIN BATTERY AND SUPPLEMENTARY BATTERY WHILE DETACHING THE BATTERIES

摘要

PURPOSE: A battery exchange device of a portable terminal is provided to permit a time overlapping between a main battery and a supplementary battery while detaching the batteries, and to comprise plural contact switches for sensing the detachment of the batteries, thereby minimizing power noise and voltage instability while supplying a sufficient time for a terminal entering a standby mode. CONSTITUTION: A combinational logic circuit receives input signals generated from contact switches of batteries and a portable terminal, and processes the received input signals. A flip-flop circuit receives the signals generated from the combinational logic circuit, and controls power according to the received signals. A timer circuit controls a time delay of the combinational logic circuit and the flip-flop circuit.