Railway Electric Line State Monitoring With Opto-Isolated Current Sensing
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Solution Overview
Problem
Existing railway braking systems face inaccuracies in pressure calibration, aging-related variations, oxidation of contacts, and limited operational cycles in pressure switch devices, leading to potential overheating and irreparable damage, which semiconductor circuits aim to address but are hindered by voltage drop issues and compatibility with relay systems.
Innovation Solution
A monitoring device for the open or closed state of an electric line in railway vehicles, utilizing a current generator, opto-isolator, and current detection module to manage voltage drops and ensure reliable operation, replacing traditional relays with electronic pressure switches that maintain high Mean Time Between Failures and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If semiconductor circuits are used to replace pressure switch devices, then reliability and stability are improved, but voltage drop increases causing compatibility issues with relay systems
Solution Approach 1:
The patent introduces a monitoring device as an intermediary component that detects the open/closed state of electric lines in the braking system. This monitoring device bridges the gap between semiconductor pressure switches and traditional relay systems, enabling the use of reliable semiconductor circuits while maintaining compatibility with existing relay-based control architectures through voltage level adaptation and state signaling.
Solution Approach 2:
The patent replaces mechanical pressure switch devices with semiconductor-based electronic pressure switches. This substitution eliminates mechanical wear and oxidation issues inherent in traditional pressure switches, significantly improving reliability and stability while reducing maintenance requirements in the railway braking system.
2Adaptability or versatility
If traditional pressure switch devices are used, then compatibility with relay systems is maintained, but oxidation of contacts and limited operational cycles reduce reliability
Solution Approach 1:
The patent replaces mechanical pressure switch devices with semiconductor-based electronic pressure switches. This substitution eliminates mechanical wear and oxidation issues inherent in traditional pressure switches, significantly improving reliability and stability while reducing maintenance requirements in the railway braking system.
Solution Approach 2:
The monitoring device serves as an intermediary that enables communication between the electronic pressure switches and traditional relay systems, allowing the new semiconductor-based switches to be integrated into existing relay-controlled braking systems without requiring complete system redesign.
3Duration of action of stationary object
If electronic pressure switches are implemented, then maintenance cycles can be extended, but voltage drop affects operation with traditional relays
Solution Approach 1:
The monitoring device acts as an intermediary component that detects voltage levels and electrical line states, compensating for voltage drops introduced by electronic pressure switches. This enables the system to maintain proper operation with traditional relay components while benefiting from the extended maintenance cycles provided by solid-state electronic switches.
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 significantly increases the reliability and availability of railway braking systems by minimizing voltage drops and heat dissipation, allowing for longer maintenance cycles and improved safety by accurately monitoring brake cylinder pressures without mechanical contact issues.
Implementation Method 1
a current generator (301) arranged to supply in said electric line a reference current (Igen) having a predetermined non-zero value when there is a voltage greater than a predetermined minimum voltage (Vmin) at the ends of said current generator (301)
Implementation Method 2
at least one opto-isolator means (306) including a lighting device (305) and a respective photosensitive semi-conductor element (307)
Implementation Method 3
at least one opto-isolator means (306) including a lighting device (305) and a respective photosensitive semi-conductor element (307)
Data Source
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AI summary
A monitoring device (308) of the open or closed state of an electric line is disclosed. The device (308) includes a first connection terminal (T1) and a second terminal (T2) connected to the electric line, a current generator (301) that provides a non-zero reference current (Igen) when there is a voltage greater than a predetermined minimum voltage Vmin at its ends and provides a zero current when there is a voltage less than the predetermined minimum voltage Vmin at its ends, at least one opto-isolator means (308, 605, 613) including a lighting device (305, 603, 612) and a respective photosensitive semi-conductor element (307, 604, 611), and a current detection and power supply module (304) that detects current flowing therein, supplies a supply current to the lighting device (305, 603, 612) when the detected current is equal to or greater than the reference current (Igen), and supplies a zero supply current to the lighting device (305, 603, 612) when the detected current is less than the reference current (Igen). The photosensitive semiconductor element (307, 604, 611) assumes a first state which indicates that the electric line is open when the lighting device (305, 603, 612) is off and assumes a second state when the lighting device (305, 603, 612) is on. An electric line is also described.