Integrated Protection Circuit for Ethernet Power Sourcing Equipment
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Solution Overview
Problem
Ethernet power sourcing equipment (PSE) is vulnerable to surges, such as thunderstroke surges, and lacks effective protection against both common mode and differential mode surges, which can damage the equipment, especially when used in outdoor environments.
Innovation Solution
A protection circuit is introduced, configured between the power supply chip and the transmission circuit, incorporating a bridge rectifier and protection components like transient voltage suppressors, which provide both common mode and differential mode surge protection, and additional diodes and resistors to enhance surge dissipation and charge release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection circuit is added to provide surge protection, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple protection functions (common mode surge protection and differential mode surge protection) into a single integrated protection circuit module that couples between the power supply chip and transmission circuit, reducing overall system complexity while maintaining comprehensive protection capability
Solution Approach 2:
The protection circuit is designed to provide both common mode and differential mode surge protection simultaneously through a unified structure, making the circuit multi-functional and eliminating the need for separate protection circuits for each mode
2Reliability
If multiple protection components are used to ensure comprehensive surge protection, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the functions of multiple protection components into an integrated protection circuit module, reducing the total number of discrete components that need to be manufactured and assembled, thereby lowering manufacturing cost while maintaining comprehensive surge protection
3Reliability
If a comprehensive protection circuit with multiple components is implemented, then reliability is improved, but the circuit occupies more space
Solution Approach 1:
The patent combines multiple protection functions and components into a single integrated protection circuit module, significantly reducing the space required on the circuit board while ensuring both common mode and differential mode surge protection are implemented
Solution Approach 2:
The protection circuit module is designed as a compact integrated unit that can be nested within the existing PSE architecture, minimizing the additional space required while providing comprehensive surge protection functionality
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The protection circuit effectively prevents damage from surges by directing surges to ground and providing an additional discharge path, ensuring the power supply chip and connected devices are safeguarded, while reducing component count and cost, and allowing for integration into a single component for space efficiency.
Implementation Method 1
a first bridge rectifier... each of which is coupled to the first input pin and the first output pin, the second input pin, the second output pin, and the first ground pin
Implementation Method 2
a first protection component coupled between the first output pin and the second output pin
Data Source
AI summary
A protection circuit for Ethernet and a power sourcing equipment having the same are provided. The protection circuit is coupled between a power supply chip and a transmission circuit. The transmission circuit is coupled between an Ethernet chip and an Ethernet connector. The protection circuit includes a bridge rectifier and a protection element to provide the common mode surge protection and the differential mode surge protection at the same time for the power supply chip.