Air Cleaner Shut-Down Circuit for Collector Cell Arcing
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Solution Overview
Problem
Air cleaners with high voltage collector cells are prone to arcing or shorting due to dirt and moisture accumulation, leading to potential damage and safety hazards, and existing shutdown methods may not accurately detect and address the issue, causing repeated power consumption and risk.
Innovation Solution
An air cleaner with a shut-down circuit that monitors electrical current to the collector cell, removes power if the current exceeds a threshold for a predetermined time, and generates an indication, while also restoring power after a cycle to potentially burn off obstructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electrical power is ramped back up at a fixed time after shutting down, then the device can resume operation, but the cause of arcing or shorting may not have been removed leading to repeated arcing
Solution Approach 1:
The patent implements a feedback mechanism where the control circuit continuously monitors electrical current and detects arcing conditions. The system only restores power after confirming the arcing condition has cleared, creating a closed-loop control system that prevents repeated arcing while maintaining operational continuity.
Solution Approach 2:
The patent applies preliminary action by implementing a predetermined wait period before power restoration. This delay allows time for the cause of arcing (such as moisture or debris) to be removed or evaporate, preventing immediate re-arc when power is restored.
2Productivity
If the collector cell operates continuously without monitoring, then productivity is maintained, but repeated arcing can consume excessive electrical power and create safety hazards
Solution Approach 1:
The control circuit continuously monitors electrical current drawn by the collector cell and compares it against threshold values. When arcing is detected (current exceeds threshold), the system immediately shuts down power, creating real-time feedback control that prevents harmful arcing while maintaining continuous safe operation.
Solution Approach 2:
The control circuit acts as an intermediary between the power supply and collector cell. It mediates power delivery by inserting itself in the circuit to monitor and control current flow, enabling safe operation while blocking harmful arcing conditions.
3Measurement precision
If the electrical current threshold is set low for sensitive detection, then arcing can be detected early, but normal operation may be interrupted by false positives
Solution Approach 1:
The patent employs dynamic threshold adjustment where the current threshold for arcing detection is not fixed but adapts based on operating conditions. The control circuit evaluates current patterns over time and adjusts sensitivity to distinguish between normal current variations and actual arcing conditions, reducing false positives while maintaining detection accuracy.
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
Effectively prevents repeated arcing or shorting, reduces electrical power consumption, and enhances safety by ensuring the collector cell is properly shut down and potentially clears obstructions, thus minimizing damage and risk.
Implementation Method 1
A collector cell can include an ionizer and/or an electrostatic precipitator
Implementation Method 2
A collector cell can include an ionizer and/or an electrostatic precipitator
Implementation Method 3
The shut-down circuit is configured to monitor an electrical current supplied to the collector cell
Implementation Method 4
The air cleaner comprises a high voltage power supply configured to provide a high voltage to a collector cell
Data Source
AI summary
An air cleaner is provided according to an embodiment of the invention. The air cleaner includes a high voltage power supply configured to provide a high voltage to a collector cell and a shut-down circuit coupled to the high voltage power supply. The shut-down circuit is configured to monitor an electrical current supplied to the collector cell, remove electrical power to the collector cell if the electrical current exceeds a predetermined cell current threshold for a predetermined time period, and generate an indication if the electrical power is removed from the collector cell.