USB Interface Electromagnetic Touch Pen Charging Mechanism
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Solution Overview
Problem
Conventional digital input pens require a specific charger, making it inconvenient to charge rechargeable batteries, as users must carry the charger, which is not practical.
Innovation Solution
An electromagnetic touch input pen with a USB interface that allows rechargeable batteries to be charged via a USB plug connected to a USB socket, eliminating the need for a specific charger, using a charger circuit and indicator light to manage the charging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a specific charger is used to charge the digital input pen, then the rechargeable batteries can be charged, but the user has to carry the charger with him/her
Solution Approach 1:
The USB plug is designed to interface with standard USB sockets found in various information processing devices (computers, tablets, smartphones, etc.), allowing the digital input pen to be charged universally without requiring a dedicated charger. The USB plug includes VBUS and GND contacts that connect to the charger circuit, enabling the pen to draw charging current from any USB-powered device.
2Ease of operation
If a USB plug is added to the digital input pen, then the charging portability is improved, but the device complexity increases
Solution Approach 1:
The USB plug is integrated into the digital input pen structure, combining the charging function with the existing pen body. The USB plug's VBUS and GND contacts are directly connected to the charger circuit within the pen, merging the charging interface and power management into a single unified structure rather than adding a separate charging mechanism.
3Device complexity
If the USB plug contacts are connected directly to the charger circuit, then the charging process is simplified, but the risk of electrical damage increases
Solution Approach 1:
The charger circuit is designed with protective mechanisms that prepare for potential electrical hazards before they occur. The circuit includes over-current protection, over-voltage protection, and short-circuit protection features that activate automatically when abnormal conditions are detected, preventing damage to the rechargeable batteries and other electronic components before harmful effects can manifest.
Solution Approach 2:
The charging system incorporates feedback mechanisms where the charger circuit continuously monitors the charging status, battery voltage, and current flow. Based on this real-time feedback, the charger circuit automatically adjusts charging parameters or terminates charging when appropriate, preventing electrical damage while maintaining efficient charging operation.
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 convenient charging of the pen by accessing DC power through a USB connection, simplifying the charging process and eliminating the need to carry a separate charger.
Implementation Method 1
The VBUS contact and the GND contact of the USB plug are coupled to the charger circuit, and when the USB plug is connected with a corresponding USB socket of the information processing device, the charger circuit can then access a typically 5V DC power source via the VBUS contact and the GND contact
Implementation Method 2
the battery module further includes a charger circuit, which is capable of utilizing an external DC power source to provide a charging process
Data Source
AI summary
An electromagnetic touch input pen having a USB interface, used to provide touch input to an information processing device, the pen including: an electromagnetic touch input pen, having a battery module; and a USB plug, coupled with the battery module, wherein the battery module can access a charging power with the USB plug inserted into a USB socket of the information processing device.