Earbud Charging Case Coil Layout for Parallel Wireless Charging
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Solution Overview
Problem
Conventional wireless charging systems face inefficiencies in charging small devices due to limited space, reduced charging performance, and the need for additional components like voltage boosters when the case battery is depleted, which increases charging time.
Innovation Solution
The implementation of an electronic apparatus with dual cavities and wireless charging coils that are switchable between reception and transmission modes, allowing for parallel charging of both the enclosure battery and device batteries, along with magnetic conductors and EMI shields to enhance charging efficiency and reduce circuitry components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a single wireless charging coil is used in the enclosure, then the device size is reduced, but the charging performance and efficiency deteriorate when multiple devices need to be charged simultaneously
Solution Approach 1:
The single wireless charging coil is segmented into multiple independent coils (first wireless charging coil and second wireless charging coil) positioned at different locations within the enclosure. Each coil can independently charge a device placed on it, enabling simultaneous charging of multiple devices without increasing the overall enclosure size significantly.
Solution Approach 2:
The patent transitions from a single-point charging solution to a multi-point spatial distribution of charging coils within the enclosure. By adding the dimensional aspect of spatial distribution, the system can serve multiple devices simultaneously while maintaining a compact form factor.
2Reliability
If the enclosure battery is depleted, then the wireless charging function is lost, but adding a voltage booster increases charging time and device complexity
Solution Approach 1:
The patent merges the wireless charging coil with the enclosure battery system, making the coil directly powered by the battery without requiring separate voltage booster circuitry. This integration allows the wireless charging function to remain available as long as the battery has charge, eliminating the need for additional complex components.
Solution Approach 2:
The patent extracts and removes the voltage booster component from the charging system, relying instead on the battery's native voltage output to power the wireless charging coil directly. This simplification reduces device complexity while maintaining charging functionality.
3Volume of moving object
If wireless charging coils are placed close together to save space, then the enclosure size is reduced, but electromagnetic interference between coils increases
Solution Approach 1:
The patent introduces magnetic conductors as intermediary elements positioned between the wireless charging coils and the devices being charged. These magnetic conductors focus and direct the magnetic flux from each coil, confining the electromagnetic field to the intended charging area and preventing interference with adjacent coils while maintaining compact spacing.
4Productivity
If traditional wireless charging is used without magnetic conductors, then the device complexity is reduced, but the coupling coefficient and charging efficiency are insufficient for small devices
Solution Approach 1:
Magnetic conductors are introduced as intermediary components that enhance the magnetic coupling between the wireless charging coils and the devices. These conductors focus the magnetic flux and improve the coupling coefficient, significantly boosting charging efficiency for small devices while adding minimal complexity to the overall system.
Solution Approach 2:
The patent changes the magnetic field distribution parameters by introducing magnetic conductors with specific permeability properties. This alters the magnetic flux density and coupling characteristics, optimizing the charging efficiency for small devices without requiring a complete redesign of the charging system.
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 configuration improves charging efficiency, reduces charging time, and increases coupling coefficients, enabling effective wireless charging of multiple batteries within the same system, even when the enclosure battery is at reduced charge.
Implementation Method 1
a first earbud wireless charging coil operably coupleable with the first enclosure wireless charging coil for wireless charging of the first earbud battery
Implementation Method 2
a first magnetic conductor positioned between the first earbud battery and the first earbud wireless charging coil
Implementation Method 3
a first electromagnetic interference ("EMI") shield within the enclosure and at least partially extending about the first enclosure wireless charging coil
Data Source
AI summary
Electronic apparatuses according to embodiments of the present technology may include an enclosure having a lid. The enclosure may define a first cavity and a second cavity, and may include an enclosure battery. The apparatuses may include a first enclosure wireless charging coil extending about the first cavity. The apparatuses may include a second enclosure wireless charging coil extending about the second cavity. The apparatuses may include a first earbud having a first earbud battery and a first earbud wireless charging coil operably coupleable with the first enclosure wireless charging coil for wireless charging of the first earbud battery. The apparatuses may include a second earbud having a second earbud battery and a second earbud wireless charging coil operably coupleable with the second enclosure wireless charging coil for wireless charging of the second earbud battery.