Electrostatic Air Cleaner Leakage Current Control
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Solution Overview
Problem
Electrostatic air cleaning devices with parallel-plate filter structures face issues with increasing leakage current due to particle deposits and high relative humidity, leading to reduced filtration efficiency and power utilization, especially when the leakage current exceeds the capacity of the high voltage supply.
Innovation Solution
An electrostatic air cleaning device with a particle charging section, parallel electrode plates, a current sensor, a relative humidity sensor, and a device controller that adjusts the electric potential and airflow based on measured currents to manage leakage currents, diagnosing the cause as either high humidity or particle buildup, and providing output signals for necessary cleaning or replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric field between neighboring plates is reduced to limit leakage current, then the leakage current is controlled within supply capacity, but the particle filtration efficiency and clean air delivery rate are reduced
Solution Approach 1:
The patent implements dynamic control of the electric field between precipitation plates based on real-time leakage current measurements. The controller adjusts the voltage applied to precipitation plates according to measured leakage current levels, enabling the system to adapt to varying particle deposit conditions and maintain optimal filtration efficiency while preventing excessive leakage current that could damage the power supply.
Solution Approach 2:
The patent employs a feedback mechanism where leakage current is continuously measured by a current sensor and fed back to the controller. The controller uses this feedback information to adjust the electric field strength between precipitation plates, creating a closed-loop control system that balances leakage current limitation with maintained filtration performance.
2Reliability
If the electric field between neighboring plates is reduced to limit leakage current, then the leakage current is controlled within supply capacity, but the power utilization factor is reduced
Solution Approach 1:
The system dynamically adjusts the electric field strength based on actual leakage current conditions rather than operating at a fixed reduced level. This allows the system to maintain high power utilization during normal operation when leakage is low, and only reduce the field when necessary to prevent damage, thereby optimizing energy use while ensuring reliability.
Solution Approach 2:
Through continuous monitoring of leakage current and adaptive adjustment of the electric field, the feedback control system ensures that power is utilized efficiently at all times. The system maintains optimal electric field strength for particle precipitation unless leakage current thresholds are exceeded, maximizing power utilization factor while protecting the power supply.
3Productivity
If a high voltage potential is applied between corona and collecting electrodes, then particle charging and precipitation is achieved, but leakage current increases with particle deposits and humidity
Solution Approach 1:
The patent uses feedback control to monitor leakage current and adjust the electric field strength between precipitation plates accordingly. When leakage current increases due to particle deposits or humidity, the controller reduces the voltage to maintain safe operation. This feedback mechanism allows the system to achieve high particle capture efficiency during normal operation while automatically responding to conditions that generate harmful leakage currents.
Solution Approach 2:
The system dynamically changes the voltage parameter applied to precipitation plates based on measured leakage current levels. By adjusting this critical parameter in response to operating conditions, the system maintains optimal particle precipitation efficiency while preventing excessive leakage current that would occur at constantly high voltage levels, especially under humid or heavily loaded conditions.
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 limits leakage currents, maintains efficient air filtration, and prevents power source damage by controlling voltage and airflow, while diagnosing the cause of high leakage currents and indicating when filter cleaning or replacement is required, thus ensuring continuous optimal operation.
Implementation Method 1
corona discharge devices apply a high voltage potential between discharging (corona) electrodes and collecting (or accelerating) electrodes to create a high intensity electric field and generate a corona discharge
Implementation Method 2
Particle charging is therein accomplished by high-voltage air ionization, usually by involving thin corona wires. Discharged ions from the corona wires adsorb on airborne particles during their passage through the charging section, thereby charging the particles.
Implementation Method 3
The charged particles can subsequently be precipitated by means of an electrostatic field that is set up between neighboring plates in the downstream parallel-plate section.
Implementation Method 4
corona discharge devices apply a high voltage potential between discharging (corona) electrodes and collecting (or accelerating) electrodes to create a high intensity electric field
Data Source
AI summary
An electrostatic air cleaning device comprises a particle charging section, a particle precipitation section, a current sensor for measuring an electric current flowing through electrode plates of the precipitation section and a relative humidity sensor. The voltage applied to the electrode plates and the air flow through the device are controlled in dependence on the measured current flowing through the electrode plates. In this way, control is provided to prevent excessive electric leakage currents inside the precipitation section, that may lead to a hazard, and to optimize the energy efficiency of the cleaning device in relation to its cleaning performance. The relative humidity information also enables diagnosis of the cause of the high leakage current and the status of the precipitation section concerning the amount of precipitated particles therein.