Lateral Coil Transformer Layout for Isolated Multi-Voltage Transfer
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Solution Overview
Problem
Multi-voltage domain devices, such as HV gate driver circuits, face inefficiencies in signal transmission between electrically-isolated voltage domains due to poor magnetic coupling in vertical transformers, leading to high driving losses and increased manufacturing costs.
Innovation Solution
The implementation of a lateral transformer with coils having center axes that extend in a lateral direction, allowing for improved magnetic coupling and energy transfer between coils, which reduces stray fields and enhances transformer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If vertical transformers are used for signal transmission between isolated voltage domains, then electrical isolation between voltage domains is achieved, but magnetic coupling is poor leading to high driving losses
Solution Approach 1:
The patent transitions from vertical transformer geometry to lateral transformer geometry, changing the spatial dimension of magnetic coupling. The coils are arranged laterally with their centers aligned in the lateral direction, enabling magnetic coupling through the isolation region without requiring vertical penetration, thus reducing driving losses while maintaining electrical isolation.
Solution Approach 2:
The isolation region serves as an intermediary medium that enables magnetic coupling between coils in different voltage domains while maintaining electrical isolation. The lateral coil arrangement allows magnetic flux to pass through this intermediary region efficiently, solving the contradiction between isolation and coupling.
2Reliability
If vertical transformers are used, then electrical isolation between voltage domains is maintained, but manufacturing costs increase
Solution Approach 1:
By changing from vertical to lateral coil arrangement, the patent simplifies the manufacturing process. The lateral configuration can be implemented using standard planar fabrication techniques without requiring complex vertical stacking or through-silicon via processes, thereby reducing manufacturing costs while maintaining electrical isolation through the isolation region.
3Reliability
If lateral coils with aligned center axes are used, then magnetic coupling is improved, but stray fields increase
Solution Approach 1:
The patent optimizes the local magnetic field distribution by aligning the center axes of the coils laterally. This configuration concentrates the magnetic flux density in the region between the coils, improving magnetic coupling locally while the insulator layer confines and directs the flux, reducing stray fields in surrounding areas.
Solution Approach 2:
The insulator layer positioned between the laterally arranged coils acts as an intermediary that guides and confines the magnetic flux. This intermediary structure improves magnetic coupling between the coils while containing the magnetic field lines, thereby reducing stray fields compared to vertical configurations.
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 approach enables precise setting of output voltage with improved accuracy and reliability, allowing for multiple secondary voltages to be provided simultaneously, while maintaining galvanic isolation between voltage domains without the need for changes in manufacturing processes.
Implementation Method 1
the first coil and the second coil are magnetically coupled to each other in the lateral direction based on an alignment of the first center axis with the second center axis
Data Source
AI summary
A multi-voltage domain device includes a circuit substrate comprising a first region comprising first circuitry, a second region comprising second circuitry, and an isolation region that electrically isolates the first region and the second region in a lateral direction; an insulator layer arranged on the circuit substrate; a first coil arranged in the insulator layer and electrically coupled to the first circuitry; a second coil arranged in the insulator layer, electrically coupled to the first circuitry, and laterally separated from the first coil in the lateral direction by an insulator material of the insulator layer. The first coil and the second coil have respective center axes around which respective windings are wound, that extend parallel to the lateral direction, and are aligned with each other. The first coil and the second coil are magnetically coupled to each other in the lateral direction.