Mobile Printer Power Layout for Wireless Charging Stability
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Solution Overview
Problem
Existing mobile printers face challenges in efficiently and portably supplying power due to limitations in wireless power transmission, affecting their size, weight, and operational stability.
Innovation Solution
A mobile printer design incorporating a power receiving module with a power receiving coil for non-contact power supply, a power receiving circuit for voltage conversion, and a USB-Type-C connector for power delivery, along with a battery module for charge storage, optimized for efficient power management and reduced interference between signal paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless power supply is used to reduce device complexity and improve portability, then ease of operation and compactness are improved, but power receiving efficiency and stability deteriorate due to interference from paper dust and static electricity
Solution Approach 1:
The housing is divided into two separate surfaces: a first surface serving as a power supply surface for wireless charging, and a second surface serving as a signal transmission surface. This segmentation isolates the power receiving components from signal wiring, preventing electromagnetic interference while maintaining portability and wireless power supply functionality.
Solution Approach 2:
The housing structure acts as an intermediary barrier between the power receiving module and the signal wiring. By positioning the power receiving coil near the first surface and signal wiring near the second surface, the housing walls serve as shielding intermediaries that block interference from paper dust and static electricity generated during printing operations.
2Adaptability or versatility
If multiple power supply methods are integrated to improve adaptability, then versatility is improved, but device complexity increases
Solution Approach 1:
The power supply unit is designed to accept multiple power input methods: wireless power transmission through the power receiving coil and wired power through the USB-Type-C receptacle connector. This multi-functional power supply system allows the printer to adapt to different charging scenarios without requiring separate power management systems for each method.
Solution Approach 2:
Multiple power supply interfaces (wireless power receiving coil and USB-Type-C connector) are merged into a single integrated power supply unit that can process both wireless and wired power inputs. This consolidation reduces overall device complexity by using a unified power management architecture rather than separate systems for each power source.
3Loss of energy
If signal wiring is placed closer to power receiving components to reduce loss, then energy efficiency is improved, but signal interference from power transmission increases
Solution Approach 1:
The internal housing space is segmented into distinct zones: the power supply zone containing the power receiving coil near the first surface, and the signal transmission zone containing the signal wiring near the second surface. This spatial segmentation minimizes electromagnetic interference between power and signal paths while keeping connection distances manageable to reduce signal loss.
Solution Approach 2:
Instead of placing signal wiring close to power receiving components in the same plane, the design utilizes the third dimension by positioning components on opposite surfaces of the housing. This vertical separation reduces electromagnetic coupling and interference while maintaining acceptable signal transmission efficiency through controlled impedance routing.
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
Enhances power receiving efficiency, reduces the impact of paper dust and static electricity, and improves operational stability by minimizing signal interference and maintaining portability while ensuring sufficient strength and power supply.
Implementation Method 1
a power receiving coil that receives a power transmission signal based on a power supply voltage signal from an outside as a power reception signal in a non-contact manner
Data Source
AI summary
Disclosed is a mobile printer in which a shortest distance between a power receiving circuit that outputs a first base drive voltage signal and a first surface is shorter than a shortest distance between the power receiving circuit and a second surface, a shortest distance between a USB-Type-C receptacle connector and the first surface is shorter than a shortest distance between the USB-Type-C receptacle connector and the second surface, a shortest distance between a power supply terminal and the first surface is shorter than a shortest distance between the power supply terminal and the second surface, and a shortest distance between first signal wiring which electrically couples the control unit and the transport unit and the first surface is longer than a shortest distance between the first signal wiring and the second surface.