Battery Charging Control System for Portable Terminals
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Solution Overview
Problem
Portable terminal batteries lose their maximum charged state over time due to natural discharge, leading to inefficient energy consumption and the need for frequent recharging, as existing charging systems only recognize complete charge at a certain capacity and disconnect power supply without maintaining the battery at a fully charged state.
Innovation Solution
A charging control system and method that adjusts the termination current and recharges the battery to a second charge capacity after a first charge capacity is reached, allowing for periodic recharging if the battery discharges to a certain ratio or undergoes natural discharge, thereby maintaining the battery in a fully charged state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the battery is charged to complete charge capacity and then power supply is disconnected, then the charging time is reduced and energy consumption is minimized, but the battery undergoes natural discharge and does not remain in a fully charged state
Solution Approach 1:
The system performs preliminary action by charging the battery beyond the traditional complete charge point to a second charge capacity (e.g., 99% or 100% of total capacity). This advance charging ensures that even after natural discharge occurs during storage, the battery remains in a fully charged state for extended periods, eliminating the need for immediate recharging.
Solution Approach 2:
The system implements continuity of useful action by maintaining the battery in a charged state through extended charging duration. Instead of disconnecting at the traditional complete charge point, the charging process continues to a second charge capacity, ensuring uninterrupted availability of full battery capacity over time.
2Reliability
If the battery is continuously charged to maintain full capacity, then the battery remains in a fully charged state, but energy consumption increases and charging efficiency decreases
Solution Approach 1:
The system applies dynamics by implementing a two-stage charging process with different charge capacities. The first stage charges to a first charge capacity (e.g., 95% of total capacity) using standard charging current, and the second stage charges to a second charge capacity (e.g., 99% or 100%) using reduced termination current. This dynamic adjustment optimizes energy consumption while ensuring full battery availability.
Solution Approach 2:
The system changes parameters by adjusting the termination current during the charging process. After reaching the first charge capacity, the system reduces the charging current to a lower termination current for the second charging phase. This parameter change allows the battery to reach maximum capacity with minimal additional energy consumption.
3Reliability
If the battery is charged to a higher second charge capacity beyond the first charge capacity, then the battery retains maximum charged state, but the charging process becomes more complex
Solution Approach 1:
The system uses feedback mechanisms to monitor battery charging status and automatically adjust the charging process. The controller detects when the battery reaches the first charge capacity and automatically transitions to the second charging phase with adjusted termination current. This feedback-based control simplifies the user interface while implementing complex two-stage charging logic.
Data Source
AI summary
A portable terminal includes a charging control system. The system supplies electric power to the battery. If the battery is charged completely, the system stops charging the battery temporarily, adjusts the termination current, and then charges the battery to the preset second charge capacity. The system can recharge the battery if the battery of the second charge capacity under goes a natural discharge for a certain time period by a certain rate of the second charge capacity, for example, 1%, or if the maximum voltage corresponding to the second charge capacity drops by 1% of the maximum voltage. Therefore, the system can retail the maximum charged state of the battery.