Multiwinding Transformer Coupling for Low-Loss DC Power Distribution
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Solution Overview
Problem
The existing power converter systems face efficiency challenges due to complex power control requirements, as the transmission power between windings is affected by phase differences and half-cycle voltage time integrals of rectangular pulse waves, leading to increased power loss and inefficiency.
Innovation Solution
A power conversion device utilizing a multiwinding transformer with intentionally varied magnetic coupling between secondary-side windings, where the strongest magnetic coupling is maintained between the primary-side winding and one secondary-side winding, and a weaker coupling with another, allowing for efficient DC power distribution to loads with different power consumption levels without complex control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If equal magnetic coupling is provided between all secondary-side windings and the primary-side winding, then uniform power transmission is achieved, but efficiency is reduced due to increased power loss when serving loads with different power consumption levels
Solution Approach 1:
The patent applies local quality by providing different magnetic coupling strengths between the primary-side winding and each secondary-side winding. Specifically, the first secondary-side winding is designed with stronger magnetic coupling to serve high-power loads, while the second secondary-side winding has weaker magnetic coupling for low-power loads. This differentiated design allows each winding to be optimized for its specific load requirements, reducing overall power loss without requiring complex control mechanisms.
2Loss of energy
If soft switching is expanded to improve efficiency, then power conversion efficiency increases, but transmission power control becomes complicated due to dependencies on phase difference and half-cycle voltage time integral
Solution Approach 1:
The patent extracts the control complexity related to soft-switching parameters (phase difference and half-cycle voltage time integral) by designing fixed magnetic coupling characteristics into the transformer windings. This allows the system to maintain efficiency benefits while simplifying control, as the magnetic coupling structure itself provides the necessary power transmission characteristics without requiring complex real-time adjustments.
3Adaptability or versatility
If a multiwinding transformer serves multiple loads with different power ratings, then versatility is improved, but power transmission efficiency deteriorates due to mismatched magnetic coupling
Solution Approach 1:
The patent resolves this contradiction by applying local quality through differentiated magnetic coupling designs. The first secondary-side winding is configured with stronger magnetic coupling and higher turns ratio to efficiently serve high-power loads, while the second secondary-side winding uses weaker magnetic coupling and lower turns ratio for low-power loads. This allows the multiwinding transformer to maintain high efficiency across different load types without requiring complex active control.
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
This configuration minimizes power loss and enhances efficiency by optimizing power transmission to loads with varying power ratings, reducing the cross current between secondary-side bridge circuits and lowering overall power conversion device losses.
Implementation Method 1
The plurality of secondary-side windings include a first secondary-side winding strongest in magnetic coupling to the primary-side winding and a second secondary-side winding weaker in magnetic coupling to the primary-side winding than the first secondary-side winding
Data Source
AI summary
A multiwinding transformer includes a primary-side winding and a plurality of secondary-side windings. A primary-side bridge circuit to carry out DC/AC power conversion is connected between a primary-side DC terminal connected to a DC power supply and the primary-side winding. A plurality of secondary-side bridge circuits to carry out DC/AC power conversion are connected between the plurality of secondary-side windings and a plurality of secondary-side DC terminals, respectively. The plurality of secondary-side windings include a first secondary-side winding strongest in magnetic coupling to the primary-side winding and a second secondary-side winding weaker in magnetic coupling to the primary-side winding than the first secondary-side winding.