Power interface circuit with high-level surge protection and high EMI performance

Abstract

The invention relates to a power interface circuit with high-level surge protection and high EMI performance. The input end of the circuit is connected with a power supply, the output end of the circuit is connected with a load, and the circuit comprises a protection circuit module, a first filter circuit module and a second filter circuit module which are electrically connected in sequence; the protection circuit module comprises a first piezoresistor, a second piezoresistor, a third piezoresistor and a gas discharge tube; the first filter circuit module comprises more than one first-stage filter circuit, and each first-stage filter circuit comprises a first-stage differential mode filter capacitor, a first-stage first common mode filter capacitor, a first-stage second common mode filtercapacitor and a common mode filter inductor; and the second filter circuit module comprises a second-stage filter circuit, and the second-stage filter circuit comprises a first differential mode filter inductor, a second differential mode filter inductor, a second-stage differential mode filter capacitor, a second-stage first common mode filter capacitor and a second-stage second common mode filter capacitor. Three functions of electromagnetic safety, surge protection and electromagnetic interference resistance are taken into consideration, and in the aspect of surge protection design, common-mode protection and differential-mode protection are achieved.

Description

technical field [0001] The invention relates to the technical field of circuit design, in particular to a power interface circuit with high-level surge protection and high EMI performance. Background technique [0002] The AC power interface is connected to the power grid through the power cord to provide electrical energy for the electrical equipment. Electrical products will produce various interferences during work, such as the interference generated by power conversion circuits, high-frequency transformers, digital circuits, etc. These interferences form conduction interference to the power grid and radiation interference to space through the power interface. [0003] When a high-power inductive load is switched on or off on the power grid or the power grid is struck by lightning, transient pulse interference and surge interference will be generated at the power interface. If the power interface is not designed for protection filtering, these interferences will easily af...

AI Technical Summary

Problems solved by technology

[0003] When a high-power inductive load is switched on or off on the power grid or the power grid is struck by lightning, transient pulse interference and surge interference will be generated at the power interface. If the power interface is not designed for protection filtering, these interferences will easily affect the normal operation of the equipment Interference can even damage the equipment. Therefore, the AC power interface needs to be designed for electromagnetic compatibility to ensure the stable operation of the equipment. The traditional AC power interface is difficult to meet the requirements of the increasingly harsh electromagnetic environment adaptability

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