Excitation-demagnetization device with safety protection

The present invention relates to an excitation and deexcitation equipment with safety protection, and is characterized by that it utilizes a transistor of an excitation circuit to amplify the signal sent out by microprocessor and produce a continuously-supplied current to make the TRIAC be in conducting state, and utilizes a memory to store the trigger angle and deexcitatino time set by a set-up unit, after the power is cut off, it still can store the previously-set value, and also uses a loop detecting circuit to make detection, so that when the electromagnetic chuck power is failed or the selection switch is not switched to excitation position and a feedback signal free state is produced, the microprocessor can promptly send out a signal to control a relay to make working machine stop so as to obtain the effect of safety protection.