Wireless Charging Coil with Integrated Die for Compact Power Reception
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Solution Overview
Problem
Existing wireless charging technologies face inefficiencies in energy transfer due to the design limitations of induction coils, particularly in forming long, narrow, and low-pitch coils, which hinder the placement of device dies and passive devices within the coil region without compromising power reception efficiency.
Innovation Solution
A wireless charging package is developed with a coil design that incorporates a high aspect ratio and small pitch, allowing for the integration of AC-DC converter chips and Bluetooth circuit chips, along with encapsulating materials and redistribution lines, to enhance energy reception efficiency while minimizing the package area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the coil pitch is reduced to integrate device dies within the coil region, then the package area is minimized, but the power reception efficiency deteriorates
Solution Approach 1:
The patent embeds device dies and passive devices within the region enclosed by the high aspect ratio coil, creating a nested configuration where components are placed inside the coil's enclosed space. This nesting approach minimizes the overall package area while maintaining the coil's electromagnetic functionality for wireless power reception.
Solution Approach 2:
The patent employs coils with high aspect ratios (length significantly greater than width) and small pitch dimensions. By changing the geometric parameters of the coil—specifically increasing the aspect ratio and reducing the pitch—the design achieves compact integration of device dies within the coil region while attempting to maintain acceptable power reception efficiency.
2Area of stationary object
If device dies are placed within the coil region, then the package area is reduced, but the energy transfer efficiency deteriorates
Solution Approach 1:
Device dies are positioned within the region enclosed by the high aspect ratio coil, creating a nested arrangement that reduces the overall package footprint. The nesting places active and passive components inside the coil's electromagnetic field region, achieving compact integration while relying on the extended coil geometry to maintain energy transfer efficiency.
Solution Approach 2:
The patent uses high aspect ratio coils that extend primarily in one dimension (length) rather than occupying a large two-dimensional area. This dimensional approach allows device dies to be placed within the coil's enclosed region without significantly increasing the package's planar footprint, while the extended length provides sufficient electromagnetic coupling area for energy transfer.
3Area of stationary object
If the coil aspect ratio is increased to minimize package area, then the package size is reduced, but the manufacturing complexity increases
Solution Approach 1:
The patent specifies coils with high aspect ratios where the length is significantly greater than the width, creating an elongated coil geometry. This parameter change in the coil's dimensional proportions reduces the package's planar area while the resulting compact design may present manufacturing challenges that require specialized fabrication processes.
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 improves energy reception efficiency by reducing the coil pitch and integrating device dies and passive devices within the coil region, maintaining acceptable power transfer efficiency and minimizing package size.
Implementation Method 1
Wireless charging is sometimes known as inductive charging, which uses an electromagnetic field to transfer energy between an energy transmitter and an energy receiver. The Energy is sent through inductive coupling to an electrical device
Implementation Method 2
The second induction coil converts the energy back into electric current, which is then used to charge a battery or directly drive electrical devices
Data Source
AI summary
A package includes a device die, and an encapsulating material encapsulating the device die therein. The encapsulating material has a top surface coplanar with a top surface of the device die. A coil extends from the top surface to a bottom surface of the encapsulating material, and the device die is in the region encircled by the coil. At least one dielectric layer is formed over the encapsulating material and the coil. A plurality of redistribution lines is in the at least one dielectric layer. The coil is electrically coupled to the device die through the plurality of redistribution lines.