PoE Power Sourcing Equipment Sleep Mode Circuit
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Solution Overview
Problem
Power sourcing equipment (PSE) in Power over Ethernet (PoE) systems face challenges in meeting energy draw requirements during inactive states, as existing technologies exceed regulatory limits for no-load condition electric power consumption.
Innovation Solution
Incorporating a sleep control circuitry and an effective resistance threshold detector to determine if a load with a resistance less than a predetermined threshold is connected, allowing for minimal power supply only when a valid powered device is detected, thereby reducing power consumption to comply with ecodesign requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous detection and powering functionality is maintained in PSE, then reliable PD detection and power supply is ensured, but power consumption exceeds regulatory limits during inactive states
Solution Approach 1:
The patent implements periodic detection cycles where the PSE alternates between active detection states and low-power sleep states. A timer controls the periodic activation of the detection circuitry, allowing the system to maintain reliability over time while minimizing average power consumption during inactive periods.
Solution Approach 2:
The patent employs a pre-detection output voltage applied via an impedance before full detection activates. This preliminary voltage level allows the system to screen for potential PD connections with minimal power consumption, only triggering full detection functionality when a valid signature is suspected, thus reducing overall power usage while maintaining detection reliability.
2Measurement precision
If full detection routine with multiple voltage levels is executed continuously, then accurate signature resistance determination is achieved, but power consumption increases beyond ecodesign requirements
Solution Approach 1:
The patent applies a pre-detection output voltage that is lower than the full detection voltage levels required for complete signature resistance measurement. This partial action allows the system to screen for potential PD connections with reduced power consumption, only activating full multi-voltage-level detection when necessary to confirm valid signatures.
Solution Approach 2:
The pre-detection voltage serves as a preliminary screening step before committing to the more power-intensive full detection routine. This preliminary action filters out invalid connections early, ensuring that accurate measurements are only performed when a potential valid PD is present.
3Use of energy by stationary object
If PSE enters sleep mode to reduce power consumption, then ecodesign requirements are met, but detection response time increases
Solution Approach 1:
The patent implements periodic detection cycles with timer-controlled intervals between sleep modes. This ensures that while the system spends most time in low-power state, it periodically wakes to perform detection, maintaining a balance between average power consumption and detection response time.
Solution Approach 2:
The pre-detection voltage is applied continuously or at longer intervals than full detection, providing a low-power screening mechanism that can quickly identify potential PD connections without requiring full detection resources, thus reducing both power consumption and effective detection delay.
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 reduces average power consumption of PSE to below 0.5 Watts in sleep mode, meeting regulatory standards for no-load condition electric power consumption, while ensuring power delivery to valid devices as per IEEE standards.
Implementation Method 1
an effective resistance threshold detector responsive to the sleep control circuitry and arranged to determine if a load exhibiting an effective resistance less than a predetermined threshold value is connected to the output port
Implementation Method 2
The effective resistance threshold detector comprises comparison circuitry, but is not arranged to identify if the load resistance is within the required range according to either of the above mentioned standard
Implementation Method 3
The sleep control circuitry has a timer functionality arranged to periodically run the effective resistance threshold detector
Data Source
AI summary
A power sourcing equipment (PSE) exhibiting a low power sleep mode, the PSE constituted of: a sleep control circuitry comprising a first timer; an effective resistance threshold detector responsive to the sleep control circuitry and arranged to detect whether the effective resistance across the output port of the PSE is less than a predetermined threshold; and a detection and powering circuitry responsive to the sleep control circuitry, wherein the sleep control circuitry is arranged to load the first timer with a first predetermined time period, and at the expiration of the first predetermined time period: activate the effective resistance threshold detector for a second predetermined time period; and in the event the effective resistance threshold detector detects that the effective resistance across the output port of the PSE is less than the predetermined threshold, enable the detection and powering circuitry.