Pliable Heating Device Sensor Conductor Fault Detection
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Solution Overview
Problem
Pliable heating devices face challenges in reliably detecting fault states and differentiating among various functional states due to influences such as aging, improper use, and component tolerances, which can lead to unreliable signal evaluations and incorrect interpretations.
Innovation Solution
The integration of a sensor conductor connected via a resistor device with ohmic, capacitive, and/or inductive sensor resistors, and an ohmic current-limiting resistor, along with an integrated circuit-based control unit and oscillator, allows for more sensitive and reliable detection of signal changes caused by the intermediate insulation, enabling precise adaptation and evaluation of functional states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple oscillator circuit is used for fault detection, then the device complexity is reduced, but the measurement precision and reliability of fault state detection deteriorates due to unreliable signal evaluations
Solution Approach 1:
The patent introduces an intermediate insulation layer with specific electrical properties (resistance value in the range of 10 kΩ to 10 MΩ) between the heating conductor and sensor conductor. This intermediate insulation acts as a mediator that provides reliable signal differentiation for fault detection while maintaining device simplicity. The specific resistance range ensures that the oscillator circuit can reliably detect functional states without requiring complex control electronics.
2Reliability
If the intermediate insulation has high resistance value, then the reliability of detecting fault states improves, but the sensitivity to detect signal changes deteriorates
Solution Approach 1:
The patent specifies a particular resistance value range for the intermediate insulation (10 kΩ to 10 MΩ) that optimizes both reliability and sensitivity. This parameter optimization ensures that the oscillator circuit can reliably detect fault states while maintaining sufficient sensitivity to signal changes. The resistance value is carefully selected to balance the competing requirements of reliability and sensitivity in the fault detection system.
3Reliability
If component tolerances and aging effects are considered, then the reliability of the heating device improves through better fault detection, but the device complexity increases due to more sophisticated evaluation requirements
Solution Approach 1:
The intermediate insulation layer serves as a passive mediator that provides inherent signal differentiation capabilities, eliminating the need for complex active evaluation circuits. By utilizing the natural electrical properties of the intermediate insulation (resistance value in the specified range), the system achieves reliable fault detection that accounts for component tolerances and aging effects without requiring sophisticated evaluation device complexity.
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 configuration enhances the sensitivity and differentiability of fault state detection, allowing for precise differentiation of functional states and improved reliability in evaluating the heating device's operational status, enabling better adaptation and control of the heating apparatus.
Implementation Method 1
the intermediate insulation between the sensor conductor and the heating conductor, which insulation forms an essential sensor element and advantageously has a negative thermal response of its resistance value (NTC behavior), the temperature dependence is preferably exponential
Implementation Method 2
there is a dampable oscillator, which is contained in the control device and is connected to the sensor conductor and whose output signal can be varied as a function of various functional states of the heating apparatus
Implementation Method 3
a heating conductor, a sensor conductor, an interposed electrically insulating intermediate layer
Data Source
AI summary
A pliable heating device having a flexible electrical heating apparatus, which is operated by a control device and which has at least one flexible heating element that is connected to a flexible support and that has a heating conductor, which is situated in a heating circuit, and a flexible sensor conductor, which is separated from the heating conductor by an intermediate insulation, having a dampable oscillator, which is contained in the control device and is connected to the sensor conductor and whose output signal can be varied as a function of various functional states of the heating apparatus, which functional states are detected by the sensor conductor, and having an evaluation device by which fault states can be detected from the output signal. In order to reliably detect function states, in particular fault states, the sensor conductor is connected at one end to the heating conductor via a resistor device which is connected in series to it and is of at least an ohmic, a capacitive, and/or an inductive sensor resistor, and is connected at the other end to the oscillator via an ohmic current-limiting resistor.