Scalable Single-Stage Differential Power Converter Design
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Solution Overview
Problem
Existing multi-stage high-frequency link (HFL) converters for power conversion from renewable sources face challenges such as high complexity, reliability issues due to bulky electrolytic capacitors, and difficulty in scalability, control complexity, and efficiency, particularly in achieving desirable efficiency and reducing device count and circuit complexity.
Innovation Solution
A scalable single-stage differential power converter using integrated magnetics and advanced control architectures to mitigate DC components and higher-order harmonics, allowing for reduced device count and increased efficiency, with the ability to operate in various voltage and current-source topologies, and adaptable for single-phase to multi-phase applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multi-stage HFL converter architecture is used, then power conversion capability is achieved, but device complexity and circuit complexity increase
Solution Approach 1:
The patent combines the DC/DC conversion stage and DC/AC conversion stage into a single integrated converter stage, eliminating the need for separate multi-stage conversion. This merging of functions reduces the number of devices and circuit components while improving system reliability by reducing failure points associated with multiple stages and intermediate capacitors.
Solution Approach 2:
The single-stage converter is designed to perform multiple functions simultaneously: it provides both voltage boosting (DC/DC conversion) and AC waveform generation (DC/AC conversion) through a unified circuit architecture. This multi-functionality eliminates the need for separate dedicated stages for each conversion type, reducing overall device complexity.
2Volume of stationary object
If bulky electrolytic capacitors are used for DC-link, then energy storage is achieved, but converter size and reliability deteriorate
Solution Approach 1:
The patent extracts and eliminates the bulky electrolytic DC-link capacitor from the converter architecture by using an alternative energy storage approach with inductors and smaller capacitors distributed throughout the circuit. This removal of the problematic capacitor simultaneously reduces converter size and eliminates the reliability issues associated with electrolytic capacitor degradation.
3Device complexity
If separate DC/DC and DC/AC conversion stages are used, then power conversion is achieved, but device count increases
Solution Approach 1:
The patent merges the DC/DC conversion circuitry and DC/AC conversion circuitry into a single integrated converter stage, where the same power switches, inductors, and capacitors serve both conversion functions. This consolidation dramatically reduces the device count compared to having separate dedicated stages for each conversion type.
4Quantity of substance
If single-stage converter architecture is used, then device count is reduced, but achieving desirable efficiency becomes more difficult
Solution Approach 1:
The patent optimizes the electrical parameters (inductance values, capacitance values, switching frequencies, duty cycles) of the single-stage converter components to minimize power losses. By carefully selecting and adjusting these parameters, the converter achieves high efficiency despite the reduced device count and simplified architecture.
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 solution reduces complexity and cost, enhances reliability and power density, and achieves high efficiency by eliminating the need for separate DC/DC conversion stages, while maintaining compactness and scalability for different power conversion requirements.
Implementation Method 1
integrated magnetics and advanced control architectures to mitigate DC components and higher-order harmonics
Data Source
AI summary
An embodiment of the invention is a scalable single stage differential power converter. The inverter can be implemented in signal, split and multi-phases. A multiphase converter can be achieved with only three modules. Integrated magnetics used in preferred embodiments of the invention mitigate the DC component of the steady-state dynamics and can be extended to AC ripple mitigation. Control architectures in preferred embodiments can mitigate higher order harmonics in steady state dynamics. Embodiments of the invention also provide scalability for voltage and current source topologies.