Parallel Inverter Inductor with Common Core
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Solution Overview
Problem
Existing inductor devices for feeding electric current from a DC source into an AC grid via multiple inverters are complex to manufacture and inefficient in minimizing transverse currents due to differences in inverter switching responses.
Innovation Solution
An inductor device with a common magnetic core and parallel inductor windings that are wound around a one-part coil form, providing electrical connection and magnetic decoupling to minimize transverse currents between inverters, using a compact design with shared inductor windings on a common magnetic core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate inductors are provided for each inverter output, then electrical decoupling is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
Multiple separate inductors are merged into a single common magnetic core structure with multiple windings. The patent combines several individual inductors (one for each inverter output) into one integrated inductor device sharing a common magnetic core, thereby reducing component count and manufacturing complexity while maintaining the necessary electrical decoupling function through the magnetic core's inherent properties
2Ease of manufacture
If conventional inductor designs are used, then manufacturing is straightforward, but transverse currents are not effectively minimized
Solution Approach 1:
The magnetic core is designed with specific local characteristics including different winding arrangements and connection topologies for different phases. Each phase connection is optimized locally to provide appropriate impedance to transverse currents while maintaining ease of manufacture through standardized core geometries and winding patterns
3Reliability
If larger inductor dimensions are used, then transverse current suppression is improved, but device size and cost increase
Solution Approach 1:
By merging multiple inductors into a common magnetic core structure, the total volume required for transverse current suppression is reduced. The shared magnetic path and coupled windings provide enhanced suppression efficiency per unit volume compared to separate inductors, allowing smaller overall device dimensions while maintaining or improving transverse current suppression performance
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 effectively reduces transverse currents by magnetic coupling of inductors, allowing for smaller inductor dimensions and improved electrical decoupling, enhancing the efficiency and simplicity of the inductor device.
Implementation Method 1
The inductor windings are arranged on a common magnetic core... effectively reduces transverse currents by magnetic coupling of inductors
Data Source
AI summary
An inductor device has a plurality of inductor windings arranged on a common magnetic core and electrically connected, parallel to one another, to a common connection at one end of the inductor windings. The inductor windings are implemented by a one-part coil form arranged on the common magnetic core and comprising the common connection of the inductor windings. The inductor windings are wound around their common connection and the common magnetic core.