Corona Discharge Anomaly Detection via Secondary Current Monitoring
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Solution Overview
Problem
Conventional particulate measurement systems require expensive apparatus to detect voltage anomalies in corona cables and ion generation sections due to high voltage applications, leading to increased production costs and complexity in determining electrical connection anomalies.
Innovation Solution
A particulate measurement apparatus with an isolation transformer, signal line, particulate computation section, corona discharge control section, and anomaly determination section, which determines electrical connection anomalies without direct voltage detection by monitoring secondary-side current behaviors and controlling ion generation power based on primary coil voltage states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct voltage detection is used to determine electrical connection anomalies in corona cables and ion generation sections, then measurement precision is improved, but device complexity and production cost increase due to requiring expensive high-voltage detection apparatus
Solution Approach 1:
The patent introduces an intermediary approach by detecting anomalies through secondary-side current behaviors and power control states rather than directly measuring high voltage. The anomaly determination section monitors current flow and power supply conditions as indirect indicators of electrical connection status, avoiding the need for expensive high-voltage detection equipment while maintaining effective anomaly detection capability
Solution Approach 2:
The patent replaces the electrical measurement approach (direct voltage detection) with a control-based detection approach. By monitoring how the power supply system responds and adjusts during operation, and analyzing secondary-side current behaviors, the system infers electrical connection status without direct electrical contact with high-voltage components, thereby reducing device complexity and cost
2Reliability
If expensive high-voltage detection apparatus is used to detect voltage anomalies, then reliability of anomaly determination is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs inexpensive detection components (current sensors, power supply control circuits) instead of expensive high-voltage detection apparatus. These cheaper components are used to infer electrical connection status through indirect measurement of current behaviors and power control states, achieving reliable anomaly determination without high manufacturing costs
Solution Approach 2:
The system uses its own operational parameters (power supply control states, secondary-side current behaviors) to self-diagnose electrical connection anomalies. The particulate measurement apparatus monitors its own operating conditions and detects abnormalities through deviations in expected behavior patterns, eliminating the need for separate expensive detection equipment
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 accurate detection of electrical connection anomalies in corona cables and ion generation sections without the need for expensive high-voltage detection equipment, reducing production costs and improving determination accuracy by analyzing secondary-side current behaviors and power control states.
Implementation Method 1
an isolation transformer 720a for corona discharge having a primary coil 721a and a secondary coil 722a
Implementation Method 2
a primary coil 721a and a secondary coil 722a and performs voltage conversion
Implementation Method 3
an ion generation section, an electrification chamber, and a trapping section. The ion generation section generates ions by means of corona discharge
Implementation Method 4
the electrification chamber is a chamber into which the target gas is introduced and which electrifies, by using the ions, the particulates contained in the target gas to thereby produce electrified particulates
Data Source
AI summary
A particulate measurement apparatus comprises a control section, which provisionally determines in an anomaly determination process that a corona core wire is in a short anomaly state when a linear voltage is equal to or lower than a particular voltage value and increments a sensor anomaly counter CNS or a chassis anomaly counter. The control section determines that the corona core wire is in a short anomaly state when the count value of one of the anomaly counters is equal to or greater than a determination threshold.