PV Panel Diagnostic IC for Individual Fault Localization
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Solution Overview
Problem
Identifying malfunctioning photovoltaic panels within a cluster is difficult in typical PV monitoring systems, as they can only detect a group of malfunctioning panels but not the specific panels within the cluster.
Innovation Solution
A photovoltaic panel diagnostic device with a voltage and current sensing circuit, logic driver circuit, and integrated circuit (IC) that outputs specific signals indicating normal operation, unstable, or short circuit conditions, allowing quick identification of individual malfunctioning panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If typical PV monitoring solutions are used to monitor a cluster of PV panels, then the system can detect that malfunctioning panels exist in the group, but it cannot identify the specific individual panels that are malfunctioning
Solution Approach 1:
The patent divides the monitoring function into individual panel-level diagnostic circuits. Each PV panel is equipped with its own integrated circuit that independently monitors its voltage and current, enabling precise identification of malfunctioning panels without requiring a complex centralized monitoring system.
2Measurement precision
If a diagnostic device is equipped with voltage and current sensing circuits to identify malfunctioning panels, then panel identification precision improves, but the device complexity increases
Solution Approach 1:
The patent combines multiple sensing functions (voltage sensing, current sensing, logic processing, and indicator control) into a single integrated circuit. This integration reduces overall system complexity while maintaining high measurement precision for detecting unstable and short circuit conditions.
Solution Approach 2:
The integrated circuit performs multiple functions simultaneously: it senses voltage, senses current, processes logic to determine panel status, and controls indicators. This multi-functionality within a single device reduces the need for separate components and simplifies the overall system.
3Ease of operation
If each PV panel is equipped with an integrated diagnostic circuit, then the ease of identifying malfunctioning panels improves, but the manufacturing cost and device complexity increase
Solution Approach 1:
Each PV panel's diagnostic circuit is self-powered, drawing power directly from the panel itself. This eliminates the need for external power sources or complex wiring infrastructure, reducing manufacturing costs and installation complexity while enabling easy identification of malfunctioning panels through visual indicators.
Data Source
AI summary
Technologies for photovoltaic panel diagnostics include a device having a voltage sensing circuit to output a voltage detect signal when a voltage input exceeds a reference voltage and a current sensing circuit to output a current detect signal when voltage-current input exceeds a reference voltage. The voltage and voltage-current inputs may be connected to a photovoltaic solar panel. The device includes a logic driver circuit to output an unstable detect signal, a short circuit detect signal, or a normal operation signal based on the voltage detect signal and the current detect signal. Output from the logic detect circuit may be received by a resettable memory circuit, and output from the memory circuit is provided to an indicator such as a light-emitting diode or buzzer. The device may be a small application-specific integrated circuit attached to the solar panel. Other embodiments are described and claimed.