Adaptive Filter Circuit for PoE Detection Under Ground Noise
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Solution Overview
Problem
In Power over Ethernet (PoE) systems, noise from the power supply can leak through twisted pairs, causing detection failures and preventing powered devices from being powered on when the power sourcing equipment is poorly grounded.
Innovation Solution
A filtering-based power supply apparatus is introduced, featuring a power supply control circuit and an adaptive filter circuit that filters noise in the detection signal, ensuring accurate detection and power supply to connected devices by using a filter circuit within the power sourcing equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the PSE is poorly grounded to simplify installation and reduce cost, then ease of installation is improved, but noise from the power supply leaks through the twisted pair causing detection failures
Solution Approach 1:
An adaptive filter circuit is introduced as an intermediary component between the power supply control circuit and the twisted pair. This filter acts as a mediator that blocks noise from the power supply while allowing detection signals to pass through, enabling reliable detection even when the PSE is poorly grounded.
Solution Approach 2:
The noise component is extracted and removed from the detection signal using the adaptive filter circuit. The filter separates the harmful noise from the useful detection signal, allowing the PSE to detect PDs accurately despite power supply noise when poorly grounded.
2Reliability
If the adaptive filter circuit is added to filter noise during detection, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The filter uses an adaptive structure where the control switch dynamically changes its state based on the detection phase. During detection, the switch connects the adaptive filter to the detection signal path; during power supply, the switch disconnects it. This dynamic operation allows the complex filter to be integrated without permanently increasing system complexity.
Solution Approach 2:
The adaptive filter is activated periodically only during the detection phase rather than continuously. The control switch enables the filter during detection and disables it during normal power supply operation, reducing the overall impact on system complexity while maintaining detection reliability when needed.
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 solution effectively eliminates noise interference, allowing for reliable detection and power delivery to powered devices even when the power sourcing equipment is poorly grounded, preventing detection failures and ensuring normal operation.
Implementation Method 1
an adaptive filter circuit, the input terminal of which is connected to the output terminal of the detection module, and the output terminal of which is connected to the output terminal of the power supply channel, is configured to filter noise in the detection signal in the detection process
Data Source
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AI summary
This application discloses a filtering detection apparatus used in a power sourcing equipment PSE. The filtering detection apparatus includes a power supply control circuit and an adaptive filter circuit. The power supply control circuit includes a power supply channel and a detection module. The power supply channel includes a control switch, configured to control on and off of the power supply channel. The detection module is configured to send a detection signal to the power supply channel, so as to detect whether a peer device connected to the power supply channel is a valid powered device. The control switch is turned off in a detection process of the power supply channel. The adaptive filter circuit is configured to filter noise in the detection signal in the detection process of the power supply channel. This resolves a problem that noise from a power supply in the PSE affects accuracy of a detection result, which causes a valid powered device to fail to be powered on normally.