Micro Inverter Single-Transformer Layout for Multi-PV Inputs
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Solution Overview
Problem
Conventional micro inverters require multiple transformers or integrated transformers with multiple windings due to the number of lines, leading to increased volume and circuit cost.
Innovation Solution
The micro inverter design places both first and second switching circuits on the primary side of a single transformer, eliminating the need for multiple transformers or integrated transformers with multiple windings, and incorporates a common-mode capacitor on the primary side for filtering high-frequency currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple transformers or integrated transformers with multiple windings are used to accommodate multiple lines, then the micro inverter can handle multiple photovoltaic groups, but the volume and circuit cost increase
Solution Approach 1:
The patent merges multiple switching circuits (first switching circuit for PV group 1, second switching circuit for PV group 2) onto a single transformer primary side, eliminating the need for separate transformers for each line. This consolidation reduces the overall inverter volume while maintaining the capability to handle multiple photovoltaic groups simultaneously.
Solution Approach 2:
The single transformer is designed to serve multiple functions by accommodating multiple switching circuits on its primary side. The transformer can simultaneously process power from multiple photovoltaic groups through different switching circuits, making it a universal component that replaces what would traditionally require multiple specialized transformers.
2Adaptability or versatility
If multiple transformers or integrated transformers with multiple windings are used to accommodate multiple lines, then the micro inverter can handle multiple photovoltaic groups, but the circuit cost increases
Solution Approach 1:
The patent combines multiple transformer requirements into a single transformer unit. Instead of procuring and installing multiple separate transformers or a complex integrated transformer with multiple windings, the design uses one transformer with multiple switching circuits connected to its primary side, simplifying the overall circuit configuration and reducing component costs.
Solution Approach 2:
The single transformer is designed as a universal component that can handle multiple photovoltaic groups through different switching circuits. This multi-functional approach eliminates the need for specialized windings for each line, reducing circuit complexity and associated costs while maintaining versatility.
3Reliability
If switching devices are disposed on both primary and secondary sides of the transformer, then the switching devices can operate normally, but the number of transformers or windings must increase with the number of lines
Solution Approach 1:
The patent consolidates multiple switching circuits onto the primary side of a single transformer, eliminating the need for corresponding secondary side switching devices for each line. This merging approach maintains switching device reliability while significantly reducing the number of transformers and windings required.
Solution Approach 2:
The patent extracts the secondary side switching devices from the traditional configuration, retaining only the primary side switching circuits. This extraction simplifies the overall system by removing unnecessary components while maintaining the essential switching functionality needed for reliable operation.
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
This configuration reduces the number of transformers and windings, lowering the cost and volume of the micro inverter while maintaining efficient energy conversion and filtering capabilities.
Implementation Method 1
the micro inverter design places both first and second switching circuits on the primary side of a single transformer, eliminating the need for multiple transformers or integrated transformers with multiple windings, and incorporates a common-mode capacitor on the primary side for filtering high-frequency currents
Data Source
AI summary
A micro inverter and a modulation method thereof are provided in the present disclosure. The micro inverter includes a filter, a transformer, and a switching circuit. The switching circuit includes one or more first switching circuit and one second switching circuit. Each of the first switching circuits has an input terminal serving as an output terminal of a direct-current power supply, and is configured to convert a direct current into an alternating current and output the alternating current to the second switching circuit. An output terminal of the second switching circuit is connected to a primary side of the transformer. A secondary side of the transformer is connected to an input terminal of the filter.