MPPT Solar Module Bypass Circuit for Reverse-Current Testing

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Solution Overview

Problem

Existing solar photovoltaic (PV) module testing methods, such as electro-luminescence (EL) and flash current-voltage (I-V) testing, are hindered by the presence of multi-modal Maximum-Power-Point-Tracking (MPPT) power optimizer devices, which can interfere with reverse current flow and cause damage or distorted test results.

Innovation Solution

A modular add-on electronic circuit structure with a bypass Field-Effect Transistor (FET) switch and comparator is integrated with MPPT ICs to enable low-resistance reverse current flow and disable the MPPT chip during testing, allowing for reliable EL testing and undistorted flash I-V testing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If MPPT power optimizer devices are integrated into solar PV modules to maximize power generation, then power generation efficiency is improved, but reverse current flow during testing causes damage to the MPPT ICs and distorts test results

Engineering Contradiction:

Improvepower generation efficiencyVSAvoidtesting reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The bypass circuit is pre-configured and automatically activated when reverse current conditions are detected during testing, before damage can occur to the MPPT ICs. The circuit includes protection elements that are ready to engage immediately upon detection of reverse current flow conditions

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

A bypass circuit acts as an intermediary pathway that redirects reverse current away from the MPPT ICs during testing. The bypass circuit includes switches and protection elements that create an alternative current path, allowing test current to flow through the solar cells without damaging the power optimizer electronics

Inventive Principle:

Principle #24Intermediary (Mediator)

2Use of energy by moving object

If MPPT power optimizer devices are integrated into solar PV modules to enable maximum power point tracking, then energy yield is improved, but the complexity of the module increases

Engineering Contradiction:

Improveenergy yieldVSAvoidmodule complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The module is segmented into functional zones: solar cells for power generation, MPPT ICs for power optimization, and bypass circuits for protection. This segmentation allows each component to perform its specific function independently, managing complexity through functional separation

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bypass circuit serves multiple functions: it protects MPPT ICs from reverse current damage, enables accurate electrical testing, and maintains module operation during testing. This multi-functionality reduces the need for separate protection circuits for each testing scenario

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 protects the MPPT ICs from reverse current damage and ensures accurate, reliable testing results by bypassing the MPPT chip during reverse current conditions, enabling comprehensive electrical and electro-optical testing of solar PV modules.

Implementation Method 1

A bypass Field-Effect Transistor (FET) switch and comparator are integrated with MPPT ICs to enable low-resistance reverse current flow

Methodology Applied

Scientific EffectField-Effect Transistor switching:

Implementation Method 2

Solar cells and modules are made of semiconductor photovoltaic electricity-generating devices that convert light (e.g., photons from direct sunlight and diffuse daylight) into electrical energy

Methodology Applied

Scientific EffectPhotovoltaic effect: Photovoltaic Effect

Implementation Method 3

A bypass Field-Effect Transistor (FET) switch and comparator are integrated with MPPT ICs

Methodology Applied

Scientific EffectComparator detection:

Data Source

PatentUS11901738B2Distributed multi-modal power maximizing integrated circuit for solar photovoltaic modules

Publication Date: 2024.02.13 SIGMAGEN INC

AI summary

Disclosed herein is add-on electronic circuit structures and methods for providing protection against reverse-electrical-current failures and for enabling comprehensive electrical (current-voltage sweep) and electro-optical (electroluminescence or EL using reserve current flow) testing of solar photovoltaic cells and modules having at least one multi-modal maximum-power-point tracking (MPPT) power optimizer integrated circuit chip to increase electrical energy generation yield of the modules. Such multi-modal MPPT power optimizer chips are used for distributed solar electric power generation enhancement in solar photovoltaic cells, modules, and systems under realistic operating conditions with non-ideal manufacturing and environmental variations (e.g., variable and/or non-uniform sunlight or daylight, mismatched cells, etc.).