Rail Brake Angle Sensing With Galvanic Isolation for HV Strength
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Solution Overview
Problem
Existing rotational angle detection systems for rail vehicle brake drives face challenges in achieving high voltage/insulation strength (HV/ISO strength) without requiring costly modifications to standard sensors and components, leading to increased development costs, reduced durability, and larger installation space.
Innovation Solution
A rotational angle detection system with a sensor unit operatively connected to a rotary brake drive, featuring a main electronic path and a safety electronic path, where both paths are galvanically isolated, allowing standard sensors to be used while meeting HV/ISO strength requirements through redundant signal processing units and galvanic isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If standard sensors and components are modified to increase insulation strength for 110V systems, then HV/ISO strength requirements are met, but development costs, unit prices, and device complexity increase
Solution Approach 1:
The system separates the sensor unit from the evaluation unit, with each having distinct electrical potentials. The sensor unit operates at one potential level while the evaluation unit operates at another, allowing standard sensors to be used without modification while meeting HV/ISO requirements through architectural separation.
Solution Approach 2:
The patent introduces an intermediary evaluation unit that acts as a bridge between the sensor unit and the control system. This evaluation unit handles the potential difference and galvanic isolation requirements, allowing standard sensors to connect without requiring custom insulation modifications.
2Strength
If internal insulation distances are increased or non-conductive materials are added to achieve higher voltage resistance, then HV/ISO strength is improved, but installation space and device complexity increase
Solution Approach 1:
The evaluation unit serves as an intermediary that handles the voltage isolation requirements through electronic means rather than physical insulation barriers. This approach achieves the required 1000 VAC/1500 VDC resistance without increasing mechanical dimensions or requiring additional non-conductive materials in the sensor housing.
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 system achieves high reliability and cost-effectiveness by using standard sensors with galvanic isolation, reducing installation space and maintaining durability, while compensating for potential failures through redundant signal processing paths.
Implementation Method 1
the at least one signal transmitter is configured to galvanically isolate the at least one sensor unit from the section of the main electronic path which is remote from the sensor unit
Data Source
AI summary
A rotational angle detection system detects a rotational angle of a rotary brake drive for a rail vehicle and includes at least one sensor unit for detecting a rotational angle operatively connected to the rotary brake drive, and at least one main electronics path for transmitting control signals and/or sensor signals, wherein the at least one main electronics path can be operatively connected to the at least one sensor unit, wherein the at least one main electronics path includes at least one signal transmitter subdividing the main electronics path into a main electronics path section close to the sensor unit, viewed from the signal transmitter, and a main electronics path section remote from the sensor unit, viewed from the signal transmitter, and the at least one signal transmitter designed to electrically isolate the at least one sensor unit from the main electronics path section remote from the sensor unit.