Battery Pack Wireless Charging NFC Antenna Isolation
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Solution Overview
Problem
Existing battery packs with near field communication and wireless charging functions face electrical interference between high-voltage regions for wireless charging and low-voltage regions for near field communication, which can damage the near field communication circuit and affect the reliability of both functions.
Innovation Solution
A battery pack design that electrically isolates the high-voltage region for wireless charging and the low-voltage region for near field communication using a shared antenna, with a controller and switch to selectively connect the antenna to either the battery charger or the near field communication circuit based on the energy level detected, preventing interference and protecting the near field communication circuit from high-voltage signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a shared antenna is used for both wireless charging and near field communication, then device complexity is reduced, but electrical interference occurs between high-voltage and low-voltage regions
Solution Approach 1:
The patent segments the antenna system into two independent antenna elements: a first antenna for wireless charging and a second antenna for near field communication. This segmentation physically separates the high-voltage wireless charging path from the low-voltage NFC path, eliminating electrical interference while maintaining both functions. The segmentation is implemented through separate antenna structures, independent connection paths, and isolated circuit board regions.
Solution Approach 2:
The patent introduces an insulating structure as an intermediary element between the first and second antennas. This insulating structure includes a first insulating layer between the antenna elements and a second insulating layer between the antenna elements and the circuit board. The intermediary insulating layers prevent electrical coupling and interference between the high-voltage wireless charging antenna and the low-voltage NFC antenna, allowing both to coexist without mutual interference.
2Ease of manufacture
If wireless charging and near field communication circuits are integrated on the same circuit board, then manufacturing is simplified, but the near field communication circuit may be damaged by high-voltage signals
Solution Approach 1:
The patent segments the circuit board into distinct functional regions: a first circuit board region for wireless charging components and a second circuit board region for near field communication components. The second antenna is positioned in the second region and electrically connected only to NFC circuitry, while the first antenna and its high-voltage charging circuitry are isolated in the first region. This spatial segmentation on the circuit board prevents high-voltage signals from reaching the NFC circuit, protecting it from damage while maintaining manufacturing efficiency through single-board integration.
Solution Approach 2:
The patent employs insulating layers as intermediary protective elements between the high-voltage wireless charging antenna and the low-voltage NFC circuit board region. The first insulating layer is positioned between the two antennas, and the second insulating layer is positioned between the antennas and the circuit board. These intermediary insulating structures create electrical isolation barriers that prevent high-voltage breakdown and protect the NFC circuit from voltage damage, while still allowing both circuits to be mounted on the same circuit board for ease of manufacture.
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
Enables reliable simultaneous operation of wireless charging and near field communication functions without electrical interference, ensuring the near field communication circuit is not damaged by high-voltage wireless charging signals, thus improving the overall performance and reliability of both functions.
Implementation Method 1
a sensor configured to sense an energy level induced in the antenna
Data Source
AI summary
A battery pack includes an antenna attached to a battery cell, a sensor configured to sense an energy level induced in the antenna, a controller configured to determine, according to a sensed signal of the sensor, whether the energy level is a first energy level for wireless charging or is a second energy level for near field communication, and a switch connecting the antenna to a battery charger or a near field communication circuit according to a control signal of the controller.