1 results about "Power line noise" patented technology

The application discloses a portable full-shielding mobile phone safety box, and belongs to the technical field of electronic product safety protection and wireless electromagnetic regulation and control. The product adopts a three-layer composite sealing shell, a closed metal shielding layer in the three-layer composite sealing shell constitutes a Faraday cage shielding cavity, and is matched with a theftproof locking mechanism and a line electromagnetic isolation type charging assembly. The box body is closed and can block radio frequency signals in and out of the box body in full frequency bands. Night use can completely eliminate privacy leakage, remote wake-up, positioning tracking and health hazards caused by mobile phone signal interaction, can resist NFC theft and external equipment monitoring and detection, and is suitable for secret and special emergency environment stealth protection. The charging circuit is integrated with at least two levels of electromagnetic isolation structures, completely blocks power line noise and radio frequency coupling interference brought by an external power line, realizes pure direct current safe charging in a full-shielding closed environment, and starts the built-in active gain antenna after the box body is opened, amplifies mobile phone communication signals, and improves weak network use experience. The overall structure is simple and easy to mass produce and popularize.