Embedded Planar Transformer Current Sensor for PCB Space Constraints
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing current sensors for printed circuit boards require a large PCB area and are susceptible to external magnetic interference, which affects their performance.
Innovation Solution
Integrate a planar transformer with conductive windings and ferromagnetic elements into a support substrate, allowing the current sensor to be embedded within the substrate, reducing the need for a separate component and minimizing signal disturbance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated current sensor component is mounted on the printed circuit board, then the current sensing function is achieved, but the printed circuit board area required increases
Solution Approach 1:
The patent combines the current sensor with the printed circuit board substrate itself, integrating the sensing functionality directly into the board structure. The sensor is formed as part of the substrate using conductive traces and ferromagnetic elements, eliminating the need for a separate mounted component and thereby reducing the overall board area required.
2Reliability
If the conductive track passes through the printed circuit board, then the current can be monitored, but the sensor becomes exposed to external magnetic radiations
Solution Approach 1:
The patent introduces ferromagnetic elements as intermediary components between the conductive track and the external environment. These ferromagnetic elements concentrate and guide the magnetic field generated by the current-carrying track, directing it toward the sensing elements while shielding the sensor from external magnetic radiations and other harmful factors.
3Reliability
If the current sensor is integrated into the support substrate proximate to the electronic chip, then signal disturbance is reduced, but the integration complexity increases
Solution Approach 1:
The patent segments the integrated sensor into distinct functional components that can be manufactured separately and then assembled: conductive traces for current carrying, ferromagnetic elements for field concentration, and sensing elements for signal detection. This modular segmentation reduces integration complexity while maintaining the benefits of close proximity to the electronic chip for improved signal integrity.
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 integration reduces costs and signal interference by locating the current sensor proximate to the electronic chip, enhancing signal integrity and reducing electromagnetic interactions.
Implementation Method 1
a planar transformer configured to: sense a magnetic field generated by an electric current to be monitored, and output a voltage induced by this magnetic field
Implementation Method 2
the electric current sensor comprises at least one ferromagnetic element in the support substrate. Said at least one ferromagnetic element allows for confining and concentrating the magnetic field B
Data Source
AI summary
An electronic device includes a support substrate and an electronic chip assembled to the support substrate. The support substrate includes an electric current sensor using a planar transformer. The planar transformer is configured to: sense a magnetic field generated by an electric current to be monitored, and output a voltage induced by this magnetic field in the planar transformer to the electronic chip.