Resonant Switched Capacitor Conversion for Balanced Split-Phase Power
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Solution Overview
Problem
Existing electric power systems, particularly split-phase and three-phase systems, face challenges in efficiently generating and distributing power to electrical loads, leading to imbalances and increased electromagnetic interference (EMI).
Innovation Solution
The development of a resonant switched capacitor circuit (RSCC) that reduces switching losses and EMI, while also enabling the efficient generation of voltage lines and neutral lines for both split-phase and three-phase electrical power systems. This system includes DC-to-AC and DC-to-DC converters that can power electrical loads and reduce the need for autotransformers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional switching circuits are used in split-phase and three-phase power systems, then power conversion can be achieved, but switching losses and electromagnetic interference (EMI) increase
Solution Approach 1:
The patent applies resonant switching techniques where the switching circuit operates at or near the resonant frequency of the LC tank circuit. This causes the current and voltage to be in phase during switching transitions, minimizing switching losses and reducing electromagnetic interference while maintaining effective power conversion
Solution Approach 2:
The patent changes the operating parameters of the switching circuit by tuning the resonant frequency of the LC tank circuit to match the switching frequency. This parameter adjustment enables the circuit to operate in a resonant state, reducing switching losses and improving overall efficiency
2Power
If conventional power distribution systems are used, then power can be delivered to loads, but imbalance between load groups increases
Solution Approach 1:
The patent incorporates control circuits that monitor the power distribution to different load groups and adjust the switching signals accordingly. This feedback mechanism detects imbalances and compensates for them by modifying the resonant switching patterns, maintaining stable and balanced power delivery across all loads
Solution Approach 2:
The patent uses dynamic control of the resonant switching circuits to adapt to changing load conditions. The switching frequency and duty cycle are dynamically adjusted based on real-time load requirements, enabling the system to maintain balance even as load conditions change
3Power
If autotransformers are used to generate voltage lines, then voltage conversion is achieved, but device complexity increases
Solution Approach 1:
The patent extracts the voltage conversion function from the traditional autotransformer and implements it through resonant switching circuits. By removing the bulky magnetic components and replacing them with solid-state switching and LC resonance, the system achieves voltage conversion with reduced complexity and improved efficiency
Solution Approach 2:
The patent replaces the mechanical/magnetic autotransformer system with an electronic resonant switching system. The LC tank circuit and solid-state switches substitute for the traditional electromagnetic transformer, eliminating moving parts and magnetic core losses while achieving the same voltage conversion function
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 proposed solution effectively reduces power imbalances between load groups in split-phase and three-phase systems, minimizes EMI, and enhances the efficiency of power conversion, thereby improving the overall performance and reliability of electrical power distribution.
Implementation Method 1
resonant switched capacitor circuit that may reduce switching losses and may reduce electromagnetic interference (EMI)
Data Source
AI summary
An apparatus includes a DC-to-AC converter comprising a first output terminal and a second output terminal. The apparatus also includes a DC-to-DC converter comprising a third output. The DC-to-AC converter is configured to receive a DC input voltage from a DC power source, and to produce a first alternating output voltage at the first output terminal, and a second alternating output voltage at the second output terminal. The DC-to-DC converter is configured receive a DC input voltage from the DC power source, and to step down the DC input voltage at the third output.