Power Control Circuit Fault Detection via Voltage Monitoring
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Solution Overview
Problem
Existing power control circuits, such as dimmers, lack the ability to automatically detect and report various types of faulty load connections, which can lead to malfunction and fire hazards, especially in large installations like hotels or office buildings, and current arcing fault detection systems are limited in their error detection capabilities.
Innovation Solution
A power control circuit with a monitoring component that detects voltage conditions, including high-frequency components and patterns, to identify faulty connections, and a communication component that reports status information, including identification information, to a remote system for further processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If phase angle control is used to control power supply to the load, then power control capability is improved, but the ability to detect faulty load connections is lost
Solution Approach 1:
The patent combines the power control function and fault detection function into a single integrated system. The control component continues to perform phase angle control while the monitoring component simultaneously monitors voltage conditions to detect faults. This merging allows both power control capability and fault detection capability to coexist without compromising either function.
Solution Approach 2:
The power control circuit is designed with multi-functionality, serving both as a power control device and a fault detection device. The monitoring component monitors voltage across the switching circuit to detect various fault conditions including open circuits, short circuits, and arcing faults, while the control component maintains power control. This universal design enables the system to perform multiple functions simultaneously.
2Object-affected harmful factors
If arcing fault detection systems are used, then fire hazard detection is improved, but the ability to detect various types of faulty connections is limited
Solution Approach 1:
The monitoring component dynamically adjusts its detection parameters and thresholds based on the monitored voltage conditions. It can detect different types of faults (open circuits, short circuits, arcing faults) by analyzing various characteristics of the voltage signal including high-frequency components and voltage patterns. This dynamic adaptation enables the system to detect multiple types of faults with a single monitoring component.
Solution Approach 2:
The system changes detection parameters such as voltage thresholds and frequency analysis parameters to detect different types of faults. The monitoring component analyzes voltage across the switching circuit using different parameter sets depending on the operating conditions, enabling it to detect open circuits, short circuits, and arcing faults with high accuracy.
3Reliability
If monitoring of voltage across switching circuit is implemented, then fault detection capability is improved, but device complexity increases
Solution Approach 1:
The monitoring component utilizes the voltage across the switching circuit that already exists during normal operation for both power control and fault detection purposes. The system serves itself by using the same voltage signal for control and monitoring without requiring additional external power sources or separate measurement circuits, thereby reducing overall system complexity.
Solution Approach 2:
The monitoring component is designed to perform multiple monitoring functions using a single circuit. It simultaneously detects open circuits, short circuits, and arcing faults by analyzing different characteristics of the voltage signal. This multi-functional design reduces the need for multiple separate monitoring circuits, thereby minimizing the increase in device complexity.
4Loss of information
If communication component is added for remote reporting, then system monitoring capability is improved, but device complexity and cost increase
Solution Approach 1:
The communication component acts as an intermediary that bridges the local power control circuit and the remote monitoring system. It transmits fault information and status data from the power control circuit to external monitoring systems, enabling remote detection and response to faults without requiring complex local intervention systems.
Solution Approach 2:
The communication component provides feedback about the operational status and detected faults to external systems. This feedback mechanism enables remote monitoring and can trigger automated responses or alerts, improving overall system monitoring capability while keeping the local device complexity manageable through standardized communication protocols.
Data Source
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Figure 2
Figure 4~5a
AI summary
A power control circuit 1 for controlling power supply to an electrical load 2, the circuit (1) comprises terminals 11, 12 for being connected into one of said power lines, a switching circuit 14 comprising one or more semiconductor switches and connected with its terminals between the two terminals 11, 12 for switching over between a high-ohmic state and a low-ohmic state , a control component 15 for controlling switching of the switching circuit 14 according to a target value, a monitoring component 16 for monitoring a voltage across the switching circuit 14 or a voltage derived therefrom and generating a notice information when a predetermined condition of the monitored voltage is met, and a communication component 17 capable of holding an identification information for said power control circuit 1 and of communicating at least said identification information away from said power control circuit 1 upon occurrence of said notice information.