A filter protection circuit of a camera and the camera

By designing TF common-mode filtering, electrostatic discharge protection, and spread spectrum IC circuits in the camera, the electromagnetic compatibility problem of the MIPI CSI-2 camera was solved, EMI radiation and electrostatic interference were reduced, and the stability and security of data transmission were improved.

CN224401611UActive Publication Date: 2026-06-23SHENZHEN TOP FLIGHT TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHENZHEN TOP FLIGHT TECH CO LTD
Filing Date
2025-06-26
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

In existing technologies, the MIPI CSI-2 camera has electromagnetic compatibility issues under high frequency and long cabling conditions, including excessive high-order harmonic radiation, antenna effects, and electrostatic interference, which leads to unstable data transmission. Furthermore, existing solutions are costly and space-constrained, making them impractical.

Method used

Design a camera filtering and protection circuit, including a TF common-mode filter circuit, an ESD protection circuit, and a spread spectrum IC circuit, which are used to reduce common-mode noise, electrostatic interference, and clock radiation, respectively. The TF common-mode filter is located near the image acquisition sensor, the ESD filter is located near the connection port, and the spread spectrum IC is located between the image processing chip and the sensor to achieve signal filtering and spread spectrum.

Benefits of technology

It effectively reduces EMI radiation and electrostatic interference from MIPI CSI-2 cameras, making it suitable for small-sized camera products with high data bandwidth and high clock frequency, thus improving the stability and security of data transmission.

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Abstract

The utility model relates to filter protection circuit and camera of camera head, including image acquisition sensor, connecting port and image processing chip, still including TF common mode filter circuit, electrostatic protection circuit and spread spectrum IC circuit, TF common mode filter circuit is connected with image acquisition sensor, electrostatic protection circuit and TF common mode filter circuit and connecting port are connected, and the CSI the CLK port of image processing chip, the MCLK port of connecting port all are connected with spread spectrum IC circuit, application circuit of this application can reduce the common mode noise of data to the greatest extent, reduce EMI radiation, can reduce electrostatic interference data transmission, can also make the synchronous clock of protocol also have spread spectrum, thereby reducing clock radiation, this application can solve the EMI radiation emission and electrostatic protection problem of MIPI CSI -2 camera head very well, especially applicable to small, data bandwidth is high, clock frequency is high and the camera product of transmission MIPI CSI -2 protocol.
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