Strong current pulse protection circuit and method

The invention discloses a strong current pulse protection circuit which comprises an electromagnetic pulse source, a transient open circuit and a protected circuit. The input ends and the output ends of the transient circuit break circuit and the protected circuit are respectively connected with the positive electrode and the negative electrode of the electromagnetic pulse source; the transient circuit break circuit comprises a current monitoring module which outputs a first reference voltage to a control module when a current input by an electromagnetic pulse source is greater than a preset threshold current; the voltage monitoring module outputs a second reference voltage to the control module when the voltage input by the electromagnetic pulse source is greater than a preset threshold voltage; and the control module is used for disconnecting the electromagnetic pulse source from the protected circuit when receiving the first reference voltage or the second reference voltage, and driving the protected circuit by the reference voltage. According to the invention, under the strong electromagnetic pulse effect of the electromagnetic pulse source, the current passing through the protected circuit does not exceed the threshold current, the input voltage of the protected circuit does not exceed the threshold voltage, and the performance of each component can still be kept stable.