EtherCAT Controller Wakeup Circuits for Low-Power Node Management
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Solution Overview
Problem
EtherCAT networks lack support for low power modes, remote power management, cable diagnostics, and clock daisy-chaining, leading to inefficiencies and inability to effectively manage node power states and signal quality.
Innovation Solution
Incorporating a communications circuit and a wakeup circuit in EtherCAT devices to enable data transmission, a controller circuit for managing sleep modes, a processor for operating in sleep and normal modes, a clock circuit for clock generation and propagation, and a degradation calculation circuit for signal quality assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If EtherCAT nodes operate continuously to maintain network responsiveness, then network reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements dynamic power management by enabling EtherCAT nodes to switch between active and low-power states based on operational requirements. The system dynamically adjusts node operational states, allowing nodes to enter low-power mode when not actively processing data while maintaining the ability to be quickly awakened and resume normal operations, thus resolving the contradiction between continuous operation for reliability and energy conservation.
Solution Approach 2:
The patent employs preliminary action through wake-up mechanisms that prepare nodes for active operation before actual data processing begins. Nodes can be pre-configured with wake-up triggers and parameters, allowing them to transition from low-power states to active states in response to specific events or timing signals, ensuring network responsiveness is maintained while minimizing energy consumption during idle periods.
2Loss of energy
If nodes are placed in low power mode to reduce energy consumption, then energy efficiency is improved, but the ability to respond to network events deteriorates
Solution Approach 1:
The patent implements feedback mechanisms through wake-up packet protocols that allow nodes in low-power mode to receive and respond to network events. The system uses feedback loops where the master node can send wake-up packets to slave nodes, and nodes provide feedback about their operational status, ensuring that even though nodes are in low-power mode, the network maintains event responsiveness through structured communication protocols.
Solution Approach 2:
The patent introduces intermediary wake-up mechanisms that mediate between the low-power state of nodes and the need for network responsiveness. Wake-up packets and intermediate buffering mechanisms serve as intermediaries, allowing events to be communicated to and processed by nodes in low-power mode without requiring continuous active operation, thus maintaining response capability while preserving energy efficiency.
3Ease of operation
If remote power management is implemented to wake nodes remotely, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by implementing multi-functional wake-up packet protocols that serve multiple purposes within the EtherCAT network. The same communication infrastructure and packet structures used for normal data transmission are also utilized for wake-up and power management functions, allowing remote power management to be achieved without adding separate dedicated hardware or protocol layers, thus minimizing the increase in device complexity while maintaining ease of operation.
Data Source
AI summary
An EtherCAT device includes a communications circuit and a wakeup circuit. The wakeup circuit is configured to determine a condition in which to send data to an EtherCAT master node. The wakeup circuit, based on such a condition, is configured to generate a wakeup packet. The communications circuit may be configured to receive an EtherCAT frame originating from the EtherCAT master node. The communications circuit may be configured to populate the EtherCAT frame with the data to be sent to the EtherCAT master node. The communications circuit may be configured to send the EtherCAT frame to the EtherCAT master device.