Patent ID: 7809515

Claim:
A protection device that detects electricity and being configured in an interior of a power socket of a power extension cord, comprising a control unit, which is a monitoring kernel of an entire power source, and includes a microprocessor, a clock pulse wave generator being electrically connected with the microprocessor to generate a continuous clock pulse wave signal into the microprocessor for counting time of use, a first memory being electrically connected with the microprocessor to store programs and data that have been edited, and a second memory being electrically connected with the microprocessor to store the time of use, a number of protection shut-downs, a current setting value, a voltage setting value, and a power setting value; a set of input ends for sampling, which is electrically connected with the control unit to transmit a sampled value of voltage and current into the microprocessor; a display unit, which is electrically connected with the microprocessor to display the voltage, current, and power; and a warning-simulation unit which is electrically connected with the control unit; wherein the microprocessor processes the sampled voltage and current taken from the input end for sampling voltage and the input end for sampling current to determine the power, time of use, and a number of outages for comparing with both the voltage and current setting values stored in the second memory, and to output a signal to drive the warning-simulation unit to generate sound, provided that one or more of the sampled values exceed one or more of the corresponding setting values.