Automatic Power Source Switching in Electronic Apparatus
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Solution Overview
Problem
Conventional charging systems for electronic devices, such as portable telephones, require user intervention to switch power sources, leading to reduced battery capacity, prolonged charging times, and potential interruptions in power supply during source switching, especially during communication or data processing.
Innovation Solution
A charging system with a switch control signal that automatically manages the power supply from the battery to the main circuit, switching to the charger when connected and back to the battery when disconnected, and incorporating a lock mechanism to ensure secure connection and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the user manually switches power supply from battery to charger, then the battery capacity is preserved during charging, but the charging time becomes long due to user forgetfulness and operational delays
Solution Approach 1:
The system automatically detects charger connection status and switches power supply sources without user intervention. The control unit monitors the charger connection state and autonomously transitions the power supply from battery to charger when connected, and back to battery when disconnected, eliminating the need for manual user operation.
Solution Approach 2:
The system continuously monitors the connection status between the charger and electronic device, using this feedback information to automatically control the power supply switching. When the charger is detected as connected, the system switches to charger power supply; when disconnected, it returns to battery power supply, creating a closed-loop automatic control system.
2Ease of operation
If the user manually switches power supply sources, then power supply control is achieved, but power supply interruptions occur during switching operations
Solution Approach 1:
The control unit anticipates the need for power supply switching by continuously monitoring charger connection status. When the charger is detected as connected, the system proactively switches to charger power supply before the battery is depleted, ensuring continuous power supply to the main circuit without interruptions.
Solution Approach 2:
The system ensures uninterrupted power supply to the main circuit by automatically and smoothly transitioning between power supply sources. The control unit manages the switching process to maintain continuous power delivery, preventing any interruption in the operation of the electronic device during power source changes.
3Productivity
If automatic power supply switching is implemented, then charging efficiency is improved, but device complexity increases
Solution Approach 1:
The control unit performs multiple functions: it monitors charger connection status, determines power supply source selection, controls the switching of power supply to the main circuit, and manages the charging process. By consolidating these functions into a single control unit, the system achieves automatic power supply switching without proportionally increasing device complexity.
Data Source
AI summary
An electronic apparatus 100 has a main circuit 4 operable by a power supply from a battery 1, and a switch 21 for changing ON/OFF of the power supply from the battery 1 to the main circuit 4. A switch control signal is produced to switch ON/OFF of the switch 21 responsive to whether or not the electronic apparatus 100 is connected to the charger 200. If the electronic apparatus 100 is removed from the charger 200, the switch 21 becomes ON. The power is supplied from the battery 1 to the main circuit 4. The electronic apparatus 100 is connected to the charger 200, the charge of the battery 1 and the power supply from the charger 200 to the main circuit 4 is started. The switch 21 is OFF by the switch control signal. The power supply from the battery 1 to the main circuit 4 is stopped.