Cascaded H-Bridge AC-DC Circuit With Lumped Power Buffering
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Solution Overview
Problem
Traditional AC-DC systems based on cascaded H-Bridge circuit topology face issues with large electrolytic capacitors that increase system volume and reduce power density, while distributed power decoupling circuits complicate design and reduce reliability.
Innovation Solution
A lumped power supply circuit that integrates a cascaded H-bridge circuit, high-frequency filter module, and lumped power buffer module, replacing distributed capacitors with a single lumped power buffer module to absorb power frequency pulsations, improving reliability and power density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distributed power decoupling circuits are used to absorb power frequency pulsations, then the power supply function is achieved, but the design complexity increases and reliability decreases
Solution Approach 1:
The patent combines multiple distributed power decoupling circuits into a single lumped power buffer module. This merging approach reduces the number of separate components and interconnections, thereby simplifying the overall design and improving system reliability while maintaining the power frequency pulsation absorption function.
2Reliability
If multiple large electrolytic capacitors are used to absorb power frequency pulsations, then the power supply stability is improved, but the system volume increases and power density decreases
Solution Approach 1:
The patent merges multiple large electrolytic capacitors into a single lumped power buffer module with equivalent or superior capacitance. This consolidation achieves the same power supply stability and power frequency pulsation absorption while significantly reducing the overall system volume and increasing power density.
Solution Approach 2:
The patent changes the capacitance parameter configuration by using a single large-capacitance lumped power buffer module instead of multiple smaller distributed capacitors. This parameter change enables achieving the required energy storage and pulsation absorption in a more compact form factor.
3Reliability
If distributed capacitors are used in the cascaded H-bridge circuit, then the power frequency pulsation absorption is achieved, but the power density is reduced
Solution Approach 1:
The patent combines multiple distributed capacitors into a single lumped power buffer module placed at the output of the cascaded H-bridge circuit. This merging maintains the power frequency pulsation absorption capability while reducing the total component count and improving power density.
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 lumped power supply circuit reduces system volume and enhances reliability by eliminating the need for multiple large capacitors and simplifying the design, thereby increasing power density.
Implementation Method 1
high-frequency filter module (5), and a lumped power buffer module (3)... The output signal of each H-bridge sub-circuit may be filtered by a high-frequency filter module (5), in order to generate N second voltage signals
Implementation Method 2
The lumped power buffer module (3) may receive the at least one third voltage signal, and filter out some of the power frequency fluctuations in the at least one third voltage signal
Data Source
AI summary
A lumped power supply circuit for converting an AC signal into a DC signal, the lumped power supply circuit including: a cascaded H-bridge circuit having N H-bridge sub-circuits connected in series between two input terminals of the AC signal, and being configured to convert the AC signal into N first voltage signals, where N is a positive integer greater than or equal to 2; a high-frequency filtering module configured to filter the N first voltage signals, and to generate N second voltage signals; a DC conversion module to receive the N second voltage signals, and to convert the N second voltage signals into at least one third voltage signal; and a lumped power buffer module having an output terminal coupled to a load, and being configured to receive the at least one third voltage signal, and to filter out part of power frequency fluctuations in the third voltage signal.