Single-Stage Multi-Input Inverter for High-Frequency Isolation
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Solution Overview
Problem
Traditional new energy distributed power supply systems with two-stage power conversion suffer from low power density, low conversion efficiency, high cost, and limited practicality due to their complex circuit structure and instability in power supply from various new energy sources like photovoltaic cells, fuel cells, and wind generators.
Innovation Solution
A single-stage multi-input forward DC-DC chopper type high-frequency link's inverter with series simultaneous power supply is introduced, featuring a multi-input single-output combined isolated bidirectional DC-DC chopper and a multi-path series simultaneous select switch, allowing various new energy sources to supply power in a time-sharing or simultaneous manner, with high-frequency isolation and a simple circuit topology for efficient power conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional two-stage power conversion system is used, then electrical isolation and voltage matching are achieved, but circuit structure becomes complex and power density decreases
Solution Approach 1:
The patent combines the DC-DC conversion function and DC-AC inversion function into a single integrated circuit stage. The multi-input full-bridge DC-AC inverter directly converts DC voltage to AC voltage while providing electrical isolation through the high-frequency transformer, eliminating the need for separate DC-DC converter stage. This merging of functions reduces circuit complexity while maintaining electrical isolation and voltage matching capabilities.
Solution Approach 2:
The inverter circuit is designed to perform multiple functions simultaneously: it provides electrical isolation through the transformer, performs voltage transformation to match output voltage requirements, conducts power conversion from DC to AC, and enables multi-input power synthesis. This multi-functionality reduces the overall system complexity by eliminating dedicated components for each function.
2Reliability
If traditional two-stage power conversion system is used, then voltage matching is achieved, but conversion efficiency decreases
Solution Approach 1:
By merging the DC-DC conversion and DC-AC inversion into a single stage, the patent eliminates the intermediate DC-DC conversion stage that introduces additional energy losses. The high-frequency transformer directly performs voltage transformation during the inversion process, reducing the number of conversion stages and associated energy losses while maintaining voltage matching capability.
3Adaptability or versatility
If multiple single-input DC-DC converters are used for each new energy source, then independent power conversion is achieved, but system cost increases
Solution Approach 1:
The patent employs a universal multi-input full-bridge DC-AC inverter that can accept power from multiple new energy sources simultaneously. Each input channel can independently convert its DC voltage, and the inverter synthesizes these inputs into a unified AC output. This approach maintains independent power conversion capability for each source while using a single shared inverter circuit, significantly reducing system cost compared to having separate inverters for each source.
4Adaptability or versatility
If traditional distributed power supply system is used, then cooperative power supply of multiple sources is achieved, but power density decreases
Solution Approach 1:
The patent merges multiple input power channels and their conversion functions into a single integrated inverter circuit. The multi-input full-bridge topology allows simultaneous processing of multiple DC inputs and direct synthesis of AC output in one circuit stage, eliminating the need for separate converter stages for each input source. This integration significantly increases power density while maintaining cooperative power supply capability.
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 enables high-quality output AC power with high conversion efficiency, medium to large output capacity, and broad application prospects, improving the stability and flexibility of the power supply system while reducing costs.
Implementation Method 1
high-frequency transformer or the high-frequency energy storage transformer is over 20 kHz
Implementation Method 2
converting unstable and inferior DC power into stable and high-quality alternating current (AC) power by using power semiconductor devices
Data Source
AI summary
A single-stage multi-input forward DC-DC chopper type high-frequency link's inverter with series simultaneous power supply includes a multi-input single-output combined isolated bidirectional forward DC-DC chopper, a plurality of input filters connected to non-common ground and a common output filter circuit. The plurality of input filters and the output filter circuit are connected by the multi-input single-output combined isolated bidirectional forward DC-DC chopper. Each input end of the multi-input single-output combined isolated bidirectional forward DC-DC chopper is connected to output ends of each input filter in a one-to-one correspondence. The output ends of the multi-input single-output combined isolated bidirectional forward DC-DC chopper are connected to the output filter circuit. The inverter has multiple input sources connected to non-common ground, the power is supplied in a time-sharing or simultaneous manner, a high-frequency electrical isolation is performed between the output and the input.