Patent ID: 8717722

Claim:
A protection circuit for protecting a processing unit, the processing unit comprising a primary module, a secondary module, and an initialization pin; the processing unit being initialized when a power source starts to provide a first supply voltage to the secondary module and the initialization pin is activated, and generating a control signal when initialization has been completed; the protection circuit comprising: a control unit for generating a pulse voltage in response to the control signal; a switch unit being turned on when the pulse voltage is at a first voltage level and being cut off when the pulse voltage is at a second voltage level; a storage unit for receiving a second supply voltage from the power source and storing energy when the switch unit is turned on, and releasing energy to generate a third supply voltage when the switch unit is cut off; and a delay unit for delaying the pulse voltage for a predetermined time period, the third supply voltage being provided to the primary module, wherein the secondary module detects an initialization time period of the processing unit, compares the initialization time period with a threshold time period, and reactivates the initialization pin when the initialization time period is shorter than the threshold time period.