Dual-Core Gate Driver Transformer for Magnetic Field Immunity
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Solution Overview
Problem
In high power applications such as wind turbines, strong magnetic fields generated by large currents and switching frequencies interfere with the control signals in gatedriver circuits, leading to signal distortion and potential errors in power electronic switch control.
Innovation Solution
A gatedriver circuit with a transformer featuring separate first and second cores of magnetically conductive material, where the windings of the electrical conductors around the first core have the same winding direction and around the second core have opposite winding direction, allowing mutual magnetic interaction to counteract magnetic field influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional transformer is used for galvanic separation in gatedriver circuits, then the control signal transfer is achieved, but the signal is distorted by strong magnetic fields generated by high power applications
Solution Approach 1:
The transformer is divided into two separate cores instead of using a single core. Each core has its own windings, and the cores are positioned to allow mutual magnetic interaction. This segmentation allows the magnetic field interference to be counteracted by the opposing winding configurations, thereby improving reliability in high magnetic field environments.
Solution Approach 2:
The windings around the first core have the same winding direction, while the windings around the second core have opposite winding direction. This asymmetric winding configuration creates opposing magnetic field responses that counteract external magnetic field interference, resolving the contradiction between signal transfer reliability and magnetic field susceptibility.
2Reliability
If galvanic separation is implemented using a transformer, then electrical isolation is achieved, but magnetic field interference distorts the control signals
Solution Approach 1:
By segmenting the transformer into two separate cores with independent windings, the system maintains galvanic separation while enabling the cores to interact magnetically. This segmentation allows the opposing winding directions to counteract magnetic field effects, preventing control signal distortion while preserving electrical isolation.
Solution Approach 2:
The invention converts the harmful magnetic field interference into a beneficial effect by using opposing windings that generate counteracting magnetic fields. The same magnetic coupling that causes interference is harnessed to create a nullifying effect, thereby protecting the control signals while maintaining galvanic separation.
3Device complexity
If a single core transformer is used, then the device complexity is low, but magnetic field interference causes signal transfer errors
Solution Approach 1:
The transformer is segmented into two cores with specific winding configurations. While this increases structural complexity compared to a single core, it enables the system to operate reliably in high magnetic field environments by allowing the cores to counteract external magnetic field effects through their opposing winding arrangements.
Solution Approach 2:
The asymmetric winding configuration (same direction for first core, opposite direction for second core) creates a balanced magnetic response that counteracts external interference. This asymmetric design, while more complex than symmetric single-core transformers, provides the necessary reliability for high power applications with strong magnetic fields.
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 provides a galvanic separation that is highly immune to strong magnetic fields, ensuring accurate control signal transfer and preventing errors in power electronic switch control, even in environments with significant magnetic interference.
Implementation Method 1
a first electrical conductor forming the electric input, wherein the first electrical conductor has at least one winding arranged around a part of the first core and at least one winding arranged around a part of the second core, a second electrical conductor forming the electric output, wherein the second electrical conductor has at least one winding arranged around a part of the first core and at least one winding arranged around a part of the second core
Implementation Method 2
separate first and second cores of magnetically conductive material, wherein each of the first and second cores are shaped to form respective closed loops
Data Source
AI summary
An electric power converter includes an electric gatedriver circuit that includes a transformer. The transformer includes separate first and second cores of magnetically conductive material that are shaped to form respective closed loops. The transformer also includes a first electrical conductor with at least one winding arranged around a part of the first core in a first winding direction and at least one winding arranged around a part of the second core in a second winding direction opposite the first winding direction. The transformer further includes a second electrical conductor with at least one winding arranged around a part of the first core in the first winding direction and at least one winding arranged around a part of the second core in the second winding direction so as to counteract electric influence induced by a common magnetic field through the closed loops of the first and second cores.