Power Source Apparatus with Dynamic Voltage and Fold-Back Protection
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Solution Overview
Problem
Conventional power source apparatuses face challenges in providing overcurrent protection while allowing for variable power supply voltage adjustments and ensuring safety against half-short-circuit conditions, which can lead to smoke generation or ignition during charging of mobile terminal devices.
Innovation Solution
A power source apparatus with an instruction information acquisition section for communicating with the mobile terminal device to set the power supply voltage, a power source section that adjusts current output based on voltage, and protection sections to prevent overheating and ignition by stopping operation if voltage falls below a preset value, ensuring safe operation and efficient charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant current characteristic is used for determination of current output prior to determination of power supply voltage, then overcurrent protection is provided, but it is difficult to realize change of power supply voltage and communication-based voltage setting compatibly
Solution Approach 1:
The patent applies dynamics by making the power supply voltage adjustable and adaptable based on communication with the mobile terminal device. The system transitions from a static constant current characteristic to a dynamic voltage-setting mechanism where the power supply voltage can be varied according to the device's requirements, resolving the contradiction between protection and adaptability
Solution Approach 2:
The patent changes the parameter of power supply voltage from a fixed value to a variable parameter that can be adjusted through communication protocols. This allows the system to adapt the voltage level based on the mobile terminal device's needs while maintaining overcurrent protection through the fold-back drooping characteristic
2Object-affected harmful factors
If the constant current characteristic portion is decreased or eliminated in the fold-back type drooping characteristic, then protection under half short-circuit state is improved, but overcurrent protection capability is reduced
Solution Approach 1:
The patent applies local quality by creating different protection characteristics for different operating conditions. The system maintains a constant current portion for normal overcurrent protection while adding a fold-back drooping characteristic specifically for half short-circuit conditions. This localized approach allows each protection mechanism to optimize for its specific purpose without compromising the other
Solution Approach 2:
The patent segments the protection characteristic into distinct portions: a constant current portion for general overcurrent protection and a fold-back drooping portion for half short-circuit protection. This segmentation allows each portion to be optimized independently, with the constant current portion maintaining reliability and the fold-back portion addressing the specific harmful effects of half short-circuit conditions
3Duration of action of moving object
If battery capacity is increased to extend operating time, then device usage duration is improved, but charging period increases
Solution Approach 1:
The patent changes the parameter of power supply voltage to enable higher voltage charging options. By allowing variable voltage setting through communication with the mobile terminal device, the system can deliver higher power levels that reduce charging time for larger capacity batteries, addressing the trade-off between battery capacity and charging duration
Data Source
AI summary
A power source apparatus includes a power source section configured to output a current comprising a preset current value as a power supply current after reducing a voltage value of a power supply voltage in case the power supply current reaches a preset current value, a first protection section configured to stop operation of the power source section if the power supply voltage stays below a first voltage value until lapse of a first period subsequent to establishment of connection between a mobile terminal device and a power supply terminal, and a second protection section configured to cause the power source section to output a power supply voltage of a voltage value based on instruction information by a second time interval if the voltage value of the power supply voltage falls below a second voltage value after reaching a target voltage value.