Patent ID: 8059377
Filing Date: 2011-11-15
Classification: G01K,H01L,H02J

Abstract:
1. A protection device for detecting a temperature, a voltage, or a current in a predetermined monitoring place in an electronic apparatus supplied with electric power from an external power source to protect the electronic apparatus from an excessive temperature, an overvoltage, or an overcurrent, the protection device comprising: a detection element arranged in the monitoring place for detecting the temperature, the voltage, or the current of the electronic apparatus to output an electric signal; an oscillating circuit for generating a clock signal having a predetermined cycle and a predetermined ON time; and a detection circuit for detecting the electric signal generated in the detection element, the detection circuit including a first switching circuit and the detection element, where the first switching circuit is connected to the detection element and switches the detection element between an active state and an inactive state, wherein during the ON time of the clock signal, the first switching circuit is in an ON state to switch the detection element to the active state, whereas during an OFF time of the clock signal, the first switching circuit is in an OFF state to switch the detection element to the inactive state, and supply of the electric power to the electronic apparatus is shut off according to an output signal output from the detection circuit.