Patent ID: 6907537

Claim:
A frequency division type protection device for a portable information processing system to provide a necessary voltage for the portable information processing system to function normally using a frequency division means when an abnormal voltage activity occurs to the portable information processing system, thus protecting the information inside the portable information processing system, the frequency division type protection device being comprised of: a control unit, which is installed inside the portable information processing system to control the work status of the portable information processing system; a piezoelectric unit, which is connected with the control unit to produce a voltage for the portable information processing system to function normally; a frequency division unit, which is connected with the control unit to detect the voltage of the portable information processing system and to produce a frequency division voltage for the control unit to function correctly when an abnormal voltage activity is detected; a display unit, which is connected with the piezoelectric unit to display the current status of the portable information processing system; a test circuit, which has a first input coupling to a test voltage and a second input coupling to a reference voltage to compare the test voltage and the reference voltage, and produces a switch voltage when there is an abnormal voltage activity; a frequency division circuit, which is connected with a voltage input to divide the frequency of a normal voltage when producing the switch voltage and, afterwards, to produce a frequency division voltage; and a switch circuit, which has a first input connecting to the voltage input and the frequency division circuit and a second input connecting to the test circuit to receive and transmit the normal voltage to the control unit, and transmits the frequency division circuit to the control unit after receiving the switch voltage.