Three-Phase Cycloconverter Controller for Single-Phase Resonant Power Conversion
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Solution Overview
Problem
There is a need for an efficient method and apparatus to convert DC voltage to AC voltage using a resonant converter, which effectively addresses the limitations of existing power conversion technologies in terms of noise, component stress, and efficiency.
Innovation Solution
A cycloconverter controller determines a DC value based on a reference waveform, enabling a three-phase cycloconverter to selectively couple an alternating current to an AC line, generating a single-phase AC output in a resonant converter system that includes a bridge controller and a cycloconverter controller, utilizing a series resonant circuit and a transformer to achieve efficient power conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a resonant converter is used for power conversion, then efficiency is improved and component stress is reduced, but the converter may be limited in adapting to different power levels and phase requirements
Solution Approach 1:
The resonant converter is designed with a universal control system that can operate in multiple modes (single-phase and three-phase) and adapt to different power levels. The controller dynamically adjusts switching patterns and frequency based on load requirements, enabling the same hardware to serve multiple functions and applications without requiring separate dedicated converters for each scenario.
2Adaptability or versatility
If conventional power converters are used, then adaptability to different applications is achieved, but noise and component stress increase
Solution Approach 1:
The converter utilizes resonant oscillation at carefully selected frequencies to achieve soft switching conditions. By operating at or near the resonant frequency of the LC circuit, the converter minimizes voltage and current spikes, reduces electromagnetic interference (noise), and decreases stress on semiconductor switches and other components. This resonant approach allows flexible application adaptation while maintaining low noise and component stress.
3Loss of energy
If a three-phase resonant converter is used, then efficient power conversion is achieved, but the ability to provide single-phase output is limited
Solution Approach 1:
The converter employs dynamic switching control that can reconfigure the three-phase bridge circuitry to provide either single-phase or three-phase output based on real-time demand. The control system dynamically adjusts the switching patterns of the semiconductor devices, enabling the same three-phase resonant converter hardware to efficiently deliver power in different phase configurations without requiring separate dedicated converters for each output type.
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 enables efficient conversion of DC to AC power with reduced noise and component stress, resulting in smaller, more efficient, and cost-effective power conversion devices that can operate across a wide range of power levels with minimal changes in switching frequency.
Implementation Method 1
resonant converter system that includes a bridge controller and a cycloconverter controller, utilizing a series resonant circuit and a transformer
Implementation Method 2
utilizing a series resonant circuit and a transformer to achieve efficient power conversion
Data Source
AI summary
A method and apparatus for providing AC power. In one embodiment, the apparatus comprises a cycloconverter controller for determining a DC value based on a reference waveform and a three-phase cycloconverter, coupled to the cycloconverter controller, for selectively coupling, based on the DC value, an alternating current to an AC line to generate a single-phase AC output.