Electronic control system for electrostatic precipitators connected in series
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Solution Overview
Problem
Existing building ventilation systems rely on pocket filters rather than electrostatic precipitators, necessitating an electronic control system capable of managing multiple electrostatic precipitators of varying sizes, while ensuring easy assembly, maintenance, and replacement of defective parts.
Innovation Solution
An electronic control system comprising a master device and node devices, where each node device is connected in series, with unique position numbering and galvanic isolation for voltage transmission, allowing for centralized control of ionization and collector stages of electrostatic precipitators, and adaptation of ionization current and high voltage based on air volume flow and precipitator size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pocket filters are replaced by electrostatic precipitators in building ventilation systems, then particle filtration performance is improved, but device complexity increases due to the need for electronic control systems managing multiple precipitators
Solution Approach 1:
The control system is segmented into a hierarchical structure with master devices at the top level and node devices at the lower level, each managing specific subsets of electrostatic precipitators. This segmentation distributes control functions across multiple independent units, reducing the complexity burden on any single component while maintaining overall system capability to manage large numbers of precipitators.
Solution Approach 2:
Node devices serve as intermediary components between master devices and individual electrostatic precipitators. Each node device manages a specific subset of precipitators and communicates with master devices, acting as a mediator that simplifies the control architecture by breaking down direct master-to-precipitator connections into manageable intermediate steps.
2Measurement precision
If multiple electrostatic precipitators are controlled by a centralized system, then control precision is improved, but ease of maintenance deteriorates due to difficulty in locating and replacing defective parts
Solution Approach 1:
The control system is divided into independent node devices, each responsible for specific subsets of electrostatic precipitators. This segmentation enables localized maintenance where defective node devices or precipitators can be identified and replaced without affecting the entire system, significantly improving ease of repair while maintaining centralized control precision through the master device architecture.
Solution Approach 2:
Node devices are designed with self-identifying characteristics including unique position numbers and coding detection capabilities. When a node device or precipitator fails, the system can automatically identify the defective component's location and status, enabling rapid maintenance response without requiring complex diagnostic procedures across the entire system.
3Device complexity
If node devices are connected in series chains, then device complexity is reduced, but reliability decreases due to potential failure points in the chain connections
Solution Approach 1:
Node devices are pre-configured with unique position numbers and identification codes during manufacturing. This preliminary configuration enables automatic self-identification and positioning within the series chain when deployed, eliminating the need for complex manual configuration and reducing potential failure points related to installation errors while maintaining the simplified series connection structure.
4Reliability
If galvanic isolating elements are used for voltage transmission, then safety is improved, but ease of operation deteriorates due to additional isolation requirements
Solution Approach 1:
The galvanic isolating element is integrated into the node device assembly as a unified component rather than a separate external element. This merging of the isolating function into the existing node device structure eliminates additional operational steps or complex isolation procedures, maintaining safety while preserving operational simplicity through design integration.
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
Enables efficient control and maintenance of multiple electrostatic precipitators, facilitating their integration into building ventilation systems by allowing for automatic configuration, precise parameterization, and localized failure detection and resolution.
Implementation Method 1
Each of the node devices has a galvanic isolating element for transmitting the supply voltage from the node device to the connected electrostatic precipitator
Implementation Method 2
Electrostatic precipitators can filter out particles contained in a gas or air stream
Data Source
AI summary
The invention concerns an electrostatic precipitator comprising an ionisation stage, a collector stage and a power supply. The power supply comprises a first high-voltage power supply unit for applying a first DC high voltage to the ionization stage and a second high-voltage power supply unit for applying a second DC high voltage to the collector stage. The first high-voltage power supply unit is configured to operate the ionization stage current-controlled. A current sensor required for this is advantageously arranged in the return line carrying low voltage, for which purpose the first high-voltage power supply unit and the second high-voltage power supply unit are galvanically isolated from the mains connection and from each other.