DC Deicing Control System Arc Suppression via Periodic Waveform
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Solution Overview
Problem
Aircraft deicing systems using direct current (DC) face challenges with arc formation due to the nature of DC voltage, which can lead to inefficiencies and potential damage in deicing processes.
Innovation Solution
A DC deicing control system incorporating a periodic deicing waveform generator that produces a switched DC voltage with periods of zero voltage and non-zero voltage, utilizing a polyphase, phase shifting, or phase shaped waveform to reduce arc formation by ensuring uniform loading and rapid arc extinguishing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct current (DC) voltage is used for deicing, then continuous heating is provided to effectively remove ice, but arc formation occurs leading to inefficiencies and potential damage
Solution Approach 1:
The patent applies periodic action by switching the DC voltage to create pulsed heating cycles. The control system periodically applies voltage to the deicing mat, creating intervals of heating followed by intervals of zero voltage. This periodic switching prevents continuous arc formation while maintaining effective ice removal through thermal accumulation during the heating phases.
Solution Approach 2:
The patent converts the harmful arc formation into a beneficial control mechanism. By intentionally introducing zero-voltage intervals, the system prevents arcs from forming in the first place, while the thermal energy accumulated during voltage application phases continues to effectively remove ice. The potential harm of DC arcing is transformed into a controlled heating process.
2Object-generated harmful factors
If switched DC voltage with periodic zero voltage periods is applied, then arc formation is reduced, but control complexity increases
Solution Approach 1:
The control system employs self-service by using the deicing mat's own thermal properties to manage the heating process. The mat's thermal mass naturally accumulates heat during voltage application and releases it during zero-voltage intervals, eliminating the need for complex external temperature regulation mechanisms. The system self-regulates through the inherent thermal characteristics of the deicing elements.
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 effectively reduces arc formation and enhances the efficiency of the deicing process by ensuring consistent and controlled electrical current delivery to deicing mats, improving the de-bonding and removal of ice from aircraft surfaces.
Implementation Method 1
The periods of zero voltage define arc extinguishing events reducing arc formation in the DC deicing control system
Implementation Method 2
a deicing system will employ heaters that cause any built up ice to de-bond and be removed by aerodynamic forces during flight
Data Source
AI summary
A direct current (DC) deicing control system including a direct current (DC) power source, and a periodic deicing waveform generator electrically connected to the DC power source. The periodic deicing waveform generator outputs a switched DC voltage having a periodic electrical current waveform including periods of zero voltage and periods of non-zero voltage. The periods of zero voltage define arc extinguishing events reducing arc formation in the DC deicing control system.