Single-Stage Multi-Input Inverter with Parallel-Timesharing Switch
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Solution Overview
Problem
Traditional new energy source distributed power supply systems employ two-stage power conversion, resulting in low power-density, low conversion efficiency, and high costs, limiting their applicability and stability.
Innovation Solution
A single-stage multi-input buck type low-frequency inverter with an external parallel-timesharing select switch is introduced, featuring a multi-input single-output high-frequency inverter circuit connected to a common low-frequency isolation voltage-transformation filter circuit, allowing multiple input sources to supply power in a time-sharing manner and performing single-stage power conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a two-stage power conversion system is used, then the system can handle multiple new energy sources, but the power-density is low, conversion efficiency is low, and cost is high
Solution Approach 1:
The patent combines the DC-DC conversion and DC-AC inversion functions into a single integrated circuit stage. The multi-input inverter directly converts DC from multiple sources into AC output without requiring separate conversion stages, thereby improving conversion efficiency and power density while maintaining adaptability to multiple energy sources
2Adaptability or versatility
If a two-stage power conversion system is used, then the system can handle multiple new energy sources, but the device complexity and cost are high
Solution Approach 1:
The patent merges multiple conversion stages into a single integrated inverter circuit that accepts multiple DC inputs and produces AC output. This consolidation reduces the number of components, simplifies circuit topology, and lowers system cost while preserving the ability to handle multiple energy sources
Solution Approach 2:
The inverter circuit is designed with universal input terminals that can accept DC from various sources (photovoltaic, wind, fuel cell, etc.). The circuit topology and control strategy are configured to universally handle different input characteristics and convert them to standardized AC output, reducing the need for source-specific circuitry
3Reliability
If electrical isolation elements are added to improve safety and reliability, then the output voltage can be matched to input voltage, but the device complexity increases
Solution Approach 1:
The patent integrates the electrical isolation function into the core inverter circuit topology rather than adding it as a separate stage. The isolation transformer or isolated DC-DC converter is embedded within the single-stage conversion architecture, providing galvanic isolation while maintaining circuit simplicity and avoiding the complexity of multi-stage designs
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 enhances system stability and flexibility, achieves high conversion efficiency, reduces costs, and broadens application prospects by providing a stable AC output with low-frequency isolation and simple circuit topology.
Implementation Method 1
a low-frequency isolation is performed between an output and an input of the inverter
Data Source
AI summary
A circuit structure of a voltage type single-stage multi-input low-frequency link inverter with an external parallel-timesharing select switch is formed by connecting a plurality of input filters connected to ground and a common output low-frequency isolation voltage-transformation filter circuit through a multi-input single-output high-frequency inverter circuit. Each input end of the multi-input single-output high-frequency inverter circuit is connected to an output end of each of the input filters in a manner of one-to-one correspondence. An output end of the multi-output single-input high-frequency inverter circuit and the output low-frequency isolation voltage-transformation filter circuit are connected. The multi-input single-output high-frequency inverter circuit includes an external multi-path parallel-timesharing select four-quadrant power switch circuit and a bidirectional power flow single-input single-output high-frequency inverter circuit successively connected in cascade.