PoE PSE Controller Architecture for Low Standby Power

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Solution Overview

Problem

Current Power over Ethernet (PoE) systems face challenges in meeting the increased power demands of next-generation applications while maintaining power efficiency and adhering to regulatory standards for low standby power consumption, such as DOE level VI and COC tier II requirements.

Innovation Solution

A novel circuit architecture and methodology for a Power Source Equipment (PSE) controller that includes a micro-controller, detection and classification circuitry, and power control and monitor circuitry, which can be individually turned off to minimize standby power consumption, and the micro-controller can be put into deep sleep when no powered device is detected, using an electronically controlled switch like a MOSFET to manage power delivery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the PSE controller continuously monitors and maintains power delivery circuitry active, then power availability and response time to connected devices is improved, but standby power consumption increases

Engineering Contradiction:

Improvepower availabilityVSAvoidstandby power consumption

Core Design Contradiction:

PowerVSUse of energy by moving object

Solution Approach 1:

The system performs preliminary detection of connected devices during standby mode using minimal power, and only activates full power delivery circuitry when a device is detected. This allows the system to be ready to serve devices quickly while consuming minimal power during idle periods.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The PSE controller dynamically adjusts its operational state between active monitoring and deep sleep modes based on device detection. The system transitions from a low-power standby state to a full-power operational state only when needed, optimizing the balance between power availability and power consumption.

Inventive Principle:

Principle #15Dynamics

2Reliability

If the micro-controller remains fully active to detect and manage powered devices, then device detection accuracy and power management responsiveness is improved, but power consumption increases

Engineering Contradiction:

Improvedevice detection accuracyVSAvoidmicro-controller power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The power management system is segmented into different functional blocks with independent power control. The micro-controller can be placed in deep sleep mode while separate detection circuitry continues to monitor for connected devices, allowing reliable detection without maintaining full micro-controller activity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A detection circuit acts as an intermediary between the powered devices and the micro-controller. This intermediary circuit continuously monitors for device connections and only wakes the micro-controller when a device is detected, enabling reliable detection while minimizing micro-controller power consumption.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Power

If all circuitry blocks are kept active to support next-generation power demands, then power delivery capability is improved, but standby power consumption exceeds regulatory limits

Engineering Contradiction:

Improvepower delivery capabilityVSAvoidstandby power loss

Core Design Contradiction:

PowerVSLoss of energy

Solution Approach 1:

The power delivery system is divided into separable circuitry blocks (detection circuitry, power control circuitry, monitor circuitry) that can be independently powered down. This segmentation allows the system to maintain high power delivery capability when needed while minimizing standby power loss by disabling unnecessary blocks.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the system have different power states optimized for their specific functions. The detection circuitry operates in a low-power mode during standby, while the main power delivery circuitry remains in a deeper sleep state, allowing each component to operate with the appropriate quality for its function while minimizing overall power loss.

Inventive Principle:

Principle #3Local quality

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

This solution effectively reduces standby power levels, enabling compliance with stringent efficiency standards and supporting higher power requirements for demanding applications like dual-radio wireless access points and RFID readers, while ensuring efficient power management and detection of connected devices.

Implementation Method 1

using an electronically controlled switch like a MOSFET to manage power delivery

Methodology Applied

Scientific EffectMOSFET switching:

Data Source

PatentUS11005670B2Low standby power circuit architecture for power saving within power source equipment

Publication Date: 2021.05.11 PHIHONG TECH CO LTD

AI summary

A power source equipment (PSE) controller exhibiting low standby levels for power over Ethernet (PoE) includes a micro-controller, a detection and classification circuitry coupled to the micro-controller to detect if a powered device (PD) is connected and determine power needed to operate the connected PD, a power control and monitor circuitry coupled to the micro-controller to power the connected PD and to monitor the power consumption of the PD. The detection and classification circuitry, the power control and monitor circuitry can be individually turned off by the micro-controller to minimize standby power, the micro-controller can be put into deep sleep if no PD is detected or can be come out of deep sleep if a PD is detected.