Solid-State Autotransformer for Split-Phase Current Balancing
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Solution Overview
Problem
Existing systems struggle to efficiently balance current draw between the legs of a split-phase power sink using a neutral line, particularly when dealing with unbalanced loads.
Innovation Solution
A circuit is designed to electrically couple a single-phase power source to a split-phase power sink, utilizing switches and a filter to manage current flow between lines and a neutral line, with control signals to balance the current draw, and includes an inductive element to smooth switching currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a neutral line is used to balance current draw in a split-phase power system, then current balance between legs is improved, but system complexity increases due to additional circuit components and control mechanisms
Solution Approach 1:
The patent introduces a neutral line as an intermediary component that carries the difference current between unbalanced legs. This mediator element enables current balance by providing a return path for unbalanced current, resolving the contradiction between achieving current balance and maintaining simple system architecture.
Solution Approach 2:
The circuit is segmented into multiple switches (first switch, second switch) that independently control current flow on each leg. This segmentation allows precise control of current distribution to balance the load between legs while maintaining overall system functionality through modular control elements.
2Productivity
If switches operate at high frequency to balance current, then current balancing speed is improved, but energy loss increases due to switching losses and electromagnetic interference
Solution Approach 1:
The switches operate in periodic cycles, alternating between conducting and non-conducting states at high frequency. This periodic action enables rapid current balancing by continuously adjusting the current distribution, while the duty cycle of each switch can be optimized to minimize switching losses and reduce electromagnetic interference.
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 system effectively balances the current draw between the legs of a split-phase power sink, maintaining the neutral line at a stable voltage, thereby stabilizing the power supply to unbalanced loads.
Implementation Method 1
An inductive element can smooth currents switched by the first and second switch
Data Source
AI summary
Solid-state autotransformers are provided. A system can include a first switch coupled to a first line in which an alternating current signal is conveyed. The system can include a second switch coupled to a second line in which the alternating current signal is conveyed. The second switch can be coupled to the first switch. The first switch can, responsive to a magnitude of a first voltage from the first line to a terminal exceeding a magnitude of a second voltage from the second line to the terminal, pass current from the first line to the terminal. The second switch can, responsive to the magnitude of the second voltage exceeding the magnitude of the first voltage, pass current from the second line to the terminal.