Single-Stage Multi-Input Inverter with Time-Sharing Switches
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Solution Overview
Problem
Traditional distributed power generation systems using new energy sources face limitations such as two-stage power conversion, low power-density, low conversion efficiency, and high cost, which restrict their widespread usage.
Innovation Solution
A single-stage multi-input buck type high-frequency inverter with an internal parallel-timesharing select switch is introduced, allowing various new energy sources to supply power simultaneously or in a time-sharing manner, featuring a simple circuit topology, high conversion efficiency, and flexible output voltage configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional distributed power generation systems use multiple single-input DC converters connected in parallel or series, then various new energy sources can supply power simultaneously, but the system suffers from two-stage power conversion, low power-density, low conversion efficiency, and high cost
Solution Approach 1:
The patent merges multiple single-input DC converters into a single multi-input DC converter that accepts multiple DC power sources (photovoltaic, fuel cell, wind power) simultaneously through a unified circuit topology. This consolidation eliminates the need for separate converters for each energy source, reducing the number of conversion stages from two to one, and improving overall conversion efficiency while maintaining the ability to handle various new energy sources
2Adaptability or versatility
If traditional distributed power generation systems use multiple single-input DC converters, then various new energy sources can be connected, but the circuit structure becomes complex and power-density decreases
Solution Approach 1:
The patent designs a universal multi-input DC converter with a standardized circuit topology that can accommodate multiple types of DC power sources (photovoltaic, fuel cell, wind power) through a single unified structure. This multi-functional design eliminates the need for separate specialized converters for each energy source type, significantly simplifying the circuit structure while maintaining versatility in handling various new energy sources
3Ease of manufacture
If two-stage power conversion is used in traditional systems, then power conversion can be performed for each energy source, but conversion efficiency decreases and cost increases
Solution Approach 1:
The patent implements a single-stage power conversion system that performs DC-AC conversion in one continuous process, eliminating the intermediate DC-DC conversion stage found in traditional two-stage systems. This continuous single-stage conversion reduces energy losses by avoiding repeated conversion operations, thereby improving conversion efficiency while maintaining the capability to convert power from multiple energy sources
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 solution enhances the stability and flexibility of the power generation system, reduces costs, and enables efficient energy utilization from multiple new energy sources, offering a broad application prospect.
Implementation Method 1
high-frequency electrical isolation inverter... high-frequency transformer... working frequency of a high-frequency transformer or a high-frequency energy storage transformer is higher than 20 kHz
Implementation Method 2
high-frequency transformer or a high-frequency energy storage transformer
Data Source
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AI summary
The present disclosure relates to a single-stage multi-input buck type high-frequency link's inverter with an internal parallel-timesharing select switch, having a circuit structure as follows. The inverter circuit is formed by connecting a plurality of input filters connected to a common output high-frequency isolation voltage-transformation cycloconverter 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 one-to-one connection. An output end of the multi-input single-output high-frequency inverter circuit is connected to an input end of a high-frequency transformer of the output high-frequency isolation voltage-transformation cycloconverter filter circuit. The inverter has following advantages: a plurality of input sources are connected to common ground and supply electric power in a time-sharing manner; the high-frequency isolation is performed between the output and the input; the output high-frequency voltage-transformation filter circuit is shared; the circuit topology is simple; the single-stage power conversion is performed; the conversion efficiency is high; the output voltage ripple is small; and the application prospect is broad, which establishes a key technology for realizing a small-to-medium capability distributed power supply system jointly supplied by a plurality of new energy sources.