PoE Powered Device Dedicated Power Paths
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Solution Overview
Problem
In automotive systems using Power Over Ethernet (PoE), the start-up sequence for automotive electronics and components is time-consuming due to the need for handshaking protocols and power-up sequences, especially when transitioning from a low-power hibernation or unpowered state, and there is a need for efficient power management to reduce boot-up delays and improve system responsiveness.
Innovation Solution
Implementing a dedicated power path for low-power standby circuitry, such as memory and processors, and using boost converters to provide the required voltage levels, along with techniques like hot-swapping, programmable voltage converters, and efficient regulators to manage power distribution and reduce in-rush currents, while also simplifying handshaking protocols and enabling security features to ensure proper power delivery and component compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handshaking protocols and power-up sequences are implemented in PoE systems, then power delivery safety and device compatibility are ensured, but start-up time increases
Solution Approach 1:
The patent implements a preliminary power path establishment mechanism where a low-power power path is created before full power delivery. This allows critical circuitry to be powered up in advance during the handshaking phase, so that when full power is delivered, the device can transition to operational mode immediately without waiting for sequential power-up of all components.
Solution Approach 2:
The patent divides the power delivery system into separate power paths: a low-power power path for critical circuitry (memory, processors) and a high-power power path for main loads. This segmentation allows different parts of the system to power up at different rates and times, with critical components ready before full power is applied, thereby reducing overall start-up time while maintaining safety protocols.
2Adaptability or versatility
If all circuitry is powered up from unpowered state, then complete system functionality is achieved, but boot-up time increases
Solution Approach 1:
The patent powers up critical circuitry (memory, processors) in advance during the handshaking phase through the low-power power path. This preliminary action ensures that these components are ready and can immediately access or process data when full power is delivered, eliminating the need to wait for sequential power-up of all components.
Solution Approach 2:
The patent dynamically adjusts power distribution by switching between low-power and high-power paths based on system state. During handshaking, critical circuitry operates on the low-power path; after handshaking completes, the system transitions to high-power operation. This dynamic power management optimizes both boot-up speed and overall 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
This approach significantly reduces boot-up time, improves power efficiency, and enhances system responsiveness by maintaining information in low-power states and providing secure, efficient power management within automotive PoE systems, allowing for faster start-up and reduced power consumption during standby modes.
Implementation Method 1
using boost converters to provide the required voltage levels
Implementation Method 2
DC power from the switch is transmitted over two sets of twisted pair wires in the standard CAT-5 cabling
Data Source
AI summary
In a method performed by a Power Over Ethernet (PoE) system, Power Sourcing Equipment (PSE) provides data and voltage over Ethernet wires to a Powered Device (PD). The PD converts the PSE voltage to a regulated voltage by at least one DC-DC converter in the PD. A first load in the PD, such as a processor, operates in a standby mode during a standby period and draws a low current from the converter via a low current path. During this standby period, a high current load in the PD is disconnected and does not draw current. When the first load comes out of the standby mode and into an active mode, the converter supplies a relatively high current to the second load and the first load. In this way, the first load, if a processor, can be already booted up at the time the second load becomes active.