Rail Contact Receiving Circuit Temperature-Stable Voltage Adjustment
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Solution Overview
Problem
Existing rail contact systems face challenges in maintaining a temperature-stable output voltage, which is crucial for accurate axle counting, due to temperature-dependent variations in the receiving voltage caused by the magnetic properties of the surroundings, leading to potential safety issues and incorrect signal evaluation.
Innovation Solution
The method involves superposing a transformer-tapped adjustment voltage proportional to the electric current in the transmitting coil with the receiving voltage, ensuring the injected current is in phase opposition, thus eliminating additional temperature dependence and allowing for a temperature-stable electrical adjustment without mechanical adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrical adjustment is carried out by injecting a current in phase opposition obtained from a digital signal, then the output voltage can be kept within a desired voltage interval, but the output voltage becomes strongly temperature-dependent
Solution Approach 1:
The patent applies feedback by taking a portion of the transmitting coil current and feeding it back through the transformer circuit to the receiving circuit. This feedback mechanism ensures that the adjustment voltage automatically compensates for temperature-induced variations in the receiving voltage, maintaining temperature stability without requiring external temperature compensation
Solution Approach 2:
The system uses its own transmitting coil current as the reference for generating the adjustment voltage. By deriving the adjustment voltage from the transmitting coil current itself rather than from an external digital signal, the system achieves self-compensation for temperature effects, as the transmitting coil current inherently reflects the temperature conditions
2Ease of operation
If the receiving voltage is adjusted electrically to compensate for magnetic property variations, then the adjustment is safer and more convenient without track work, but the mechanical construction becomes less robust
Solution Approach 1:
The patent replaces mechanical adjustment mechanisms (such as adjustable transformers or movable components) with an electrical adjustment system. The transformer circuit provides electrical means to adjust the output voltage by tapping adjustment voltages proportional to the transmitting coil current, eliminating the need for mechanical adjustments and associated construction complexity
3Reliability
If the receiving voltage varies due to magnetic properties of surroundings, then the output voltage falls outside predetermined value ranges, but mechanical adjustment increases construction complexity
Solution Approach 1:
The patent changes the parameter used for adjustment from external reference signals to the transmitting coil current itself. By making the adjustment voltage proportional to the transmitting coil current through the transformer circuit, the system dynamically adapts to varying magnetic conditions without requiring complex mechanical adjustment mechanisms, maintaining output voltage within predetermined ranges
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 ensures a stable output voltage, enhancing the adjustability and reliability of axle counters, reducing safety risks by maintaining accurate signal evaluation across varying temperature conditions without structural adaptations to the transformer circuit.
Implementation Method 1
the adjustment voltage is tapped by means of a transformer circuit from a transmitting circuit of the rail contact as a voltage proportional to an electric current flowing in a transmitting coil of the rail contact
Implementation Method 2
two transmitting heads with transmitting coils mounted on a rail and lying spatially one behind the other, which heads are supplied with audio-frequency alternating currents, and two receiving coils of receiving heads arranged on the respectively opposite rail side and coupled inductively to the transmitting coils. The voltages induced in the receiving coils are supplied to an evaluation unit
Data Source
AI summary
A method is proposed for setting an output voltage of a receiving circuit (5) of a receiving head (4) of a rail contact and a rail contact system for executing the method, at least one receiving voltage tapped from the receiving head (4) of the rail contact being superposed by at least one adjustment voltage to produce the output voltage. The adjustment voltage is tapped by a transformer circuit (20) from a transmitting circuit (2) of the rail contact as a voltage proportional to an electric current flowing in a transmitting coil (7) of the rail contact.