Active Stylus Wireless Charging Power Control and Orientation
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Solution Overview
Problem
Active styluses with built-in batteries face unnecessary power consumption when charging wirelessly from electronic devices, and their orientation is limited when fixed for charging due to conventional magnet configurations.
Innovation Solution
The active stylus and electronic device system includes a power receiver and transmitter with integrated circuitry that stops signal transmission upon detecting power supply initiation, and a unique magnetic configuration allowing the stylus to be fixed in various orientations, reducing power consumption and enhancing orientation flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the active stylus is placed in the vicinity of the electronic device for wireless charging, then the battery can be charged wirelessly, but the active stylus receives uplink signals and establishes pairing with the electronic device causing unnecessary power consumption
Solution Approach 1:
The integrated circuit detects the power supply state before processing uplink signals. When power supply is detected, the IC proactively stops receiving uplink signals and transmitting downlink signals, preventing unnecessary power consumption while maintaining wireless charging capability
Solution Approach 2:
The integrated circuit continuously monitors the power supply state and provides feedback control by adjusting signal transmission/reception based on whether power is being supplied to the power receiver, optimizing power consumption during wireless charging
2Adaptability or versatility
If magnets are disposed with magnetization direction parallel to the pen axis direction, then the stylus can be fixed to the electronic device, but the orientation of the stylus is limited to one direction
Solution Approach 1:
The patent employs magnets with different magnetization directions (one parallel to pen axis, one perpendicular to pen axis) to create asymmetric magnetic attraction patterns that enable multi-orientation fixing while maintaining strong attachment force
Solution Approach 2:
By adding a magnet with perpendicular magnetization direction, the system transitions from single-dimension (one orientation) fixing to multi-dimension fixing, allowing the stylus to be attached in multiple orientations while maintaining strong magnetic attraction
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 effectively suppresses power consumption during wireless charging and provides a high degree of freedom in stylus orientation, optimizing the wireless power supply system's efficiency and usability.
Implementation Method 1
a power receiver which, in operation, receives power wirelessly supplied from the electronic device
Implementation Method 2
With the magnets of the electronic device and the magnets of the stylus attracted to each other, the stylus receiving wireless power supply is fixed to the electronic device
Data Source
AI summary
Disclosed herein is an active stylus that transmits and receives signals to and from an electronic device, the active stylus including a receiver which, in operation, receives an uplink signal transmitted from the electronic device, a transmitter which, in operation, transmits a downlink signal to the electronic device, a power receiver which, in operation, receives power wirelessly supplied from the electronic device, and an integrated circuit. When the power is not being supplied to the power receiver, the integrated circuit causes the transmitter to transmit the downlink signal in response to the receiver receiving the uplink signal. The integrated circuit stops transmission of the downlink signal by the transmitter in response to detecting that supply of the power supply to the power receiver has started.