PoDL Interconnection Circuit for Safe Power Limiting During Data Transmission
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Solution Overview
Problem
Existing techniques for power limiting in Power over Data Line (PoDL) networks, such as Single Pair Ethernet (SPE), face challenges including inability to check power levels during data transmission, power losses due to protection circuits, and limitations in achieving high safety levels, particularly in scenarios where data and power are transmitted over the same wires.
Innovation Solution
An electronic interconnection element with switching elements, a microprocessor-controlled unit, and voltage measurement capabilities, allowing redundant measurement and comparison of current and voltage to safely limit power, achieving functionally safe power limiting and intrinsic safety standards by using identical switching elements like FETs, MOSFETs, or IGBTs, and incorporating passive components for safety-oriented design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protection circuits are used for power limiting in PoDL networks, then power safety is improved, but power losses occur due to the protection circuit
Solution Approach 1:
The patent implements continuous monitoring of power parameters (voltage and current) with feedback control to dynamically adjust switching elements. This allows the system to maintain safety limits while minimizing unnecessary power dissipation by only activating protection when power thresholds are approached or exceeded.
Solution Approach 2:
The patent replaces traditional passive protection circuits with active electronic control using switching elements (MOSFETs, IGBTs) controlled by a microprocessor. This substitution enables more efficient power management by using electronic switching rather than dissipative protection mechanisms, reducing power losses while maintaining safety.
2Reliability
If power levels are checked during data transmission in PoDL networks, then safety monitoring is improved, but data transmission interruptions occur
Solution Approach 1:
The patent enables continuous simultaneous operation of data transmission and power monitoring by using separate monitoring circuits that do not interrupt the data path. The switching elements and measurement units operate in parallel with the data transmission, allowing uninterrupted communication while maintaining constant safety oversight.
Solution Approach 2:
The patent introduces intermediary monitoring circuits and control logic that act as mediators between the power transmission and safety requirements. These intermediaries continuously monitor power levels without interfering with data transmission, and only intervene by controlling switching elements when safety thresholds are violated.
3Measurement precision
If redundant measurement and comparison of current and voltage is implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent uses the same switching elements for both power control and measurement purposes, and the microprocessor performs multiple functions including monitoring, comparison, and control decisions. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity while maintaining redundant measurement capabilities.
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 enables functionally safe power limiting and intrinsic safety in PoDL networks, allowing continuous data transmission and reducing power losses, while ensuring safe disconnection and monitoring of power levels, adhering to IEC 61508 and IEEE 802.3cg standards.
Implementation Method 1
at least one voltage measurement unit is provided, by means of which the voltage drop over each switching element can be recorded as a measured value and supplied to the microprocessor
Implementation Method 2
using identical switching elements like FETs, MOSFETs, or IGBTs
Implementation Method 3
allowing redundant measurement and comparison of current and voltage to safely limit power
Data Source
AI summary
Techniques are disclosed relating to limiting power in Power over Data Line (PoDL) networks. In an embodiment, an apparatus includes a voltage terminal including a first pole and a second pole, a first line for connecting the first pole to a first terminal of a physical layer of a microelectronic component, and a second line for connecting the second pole to a second terminal of the physical layer. The apparatus may further include a switching element in each of the first and second line, where each switching element is connected to and controllable by a control unit and the control unit includes a microprocessor. The apparatus may further include a voltage measurement unit configured to measure a voltage drop over each switching element and supply the voltage drop to the microprocessor.