Charging Circuit Battery Removal Detection Control
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Solution Overview
Problem
Conventional charging circuits face system abnormalities when the consumption current of a system load exceeds the charge current, especially when the battery is removed, due to the inability to set the charging current greater than the maximum consumption current, leading to unstable power supply.
Innovation Solution
A charging circuit with a sequence controller that detects the removal of the battery during constant voltage charging and sends a suspension signal to the system load, using a comparator to determine if the battery is coupled, allowing for controlled charging operations and preventing system abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charging current is set greater than the maximum consumption current of the system load, then the power supply stability is improved, but the device complexity increases due to additional detection and control mechanisms
Solution Approach 1:
The sequence controller performs multiple functions: it controls the constant voltage charge controller, monitors battery connection status through the comparator, and manages charging suspension. By integrating these functions into a single controller, the patent avoids adding separate detection and control circuits, thus maintaining power supply stability without significantly increasing device complexity.
Solution Approach 2:
The patent implements a feedback mechanism where the comparator continuously monitors whether the battery is connected and provides this information to the sequence controller. The sequence controller then adjusts the charging operation accordingly by suspending or resuming charging. This feedback loop ensures power supply stability while using a simple and efficient control structure.
2Productivity
If the charging operation continues without detection during constant voltage charging, then the charging speed is improved, but system abnormalities occur when the battery is removed
Solution Approach 1:
The sequence controller periodically checks the battery connection status during constant voltage charging by receiving signals from the comparator. This periodic detection allows the charging operation to proceed at high speed while intermittently verifying system safety, thus preventing abnormalities when the battery is removed without significantly slowing down the charging process.
3Reliability
If additional detection circuits and control mechanisms are added to detect battery removal, then the system stability is improved, but the device complexity increases
Solution Approach 1:
The patent combines the battery removal detection function with the existing constant voltage charge controller and sequence controller. The comparator is integrated into the control circuitry, and its output is processed by the sequence controller that already manages charging operations. This merging approach improves system stability without adding independent detection circuits, thus minimizing the increase in device complexity.
4Device complexity
If the charging circuit lacks battery removal detection capability, then the device complexity is reduced, but system abnormalities occur when consumption current exceeds charge current
Solution Approach 1:
The patent implements preliminary detection of battery connection status using the comparator before charging operations that could lead to system abnormalities. The sequence controller proactively suspends charging when battery removal is detected, preventing the situation where consumption current exceeds charge current. This preliminary action ensures power supply reliability while maintaining relatively simple circuitry.
Data Source
AI summary
A charging circuit that prevents a system abnormality caused by removal of a battery. The charging circuit includes a constant voltage charge controller which detects charge voltage and performs a constant voltage charging operation. A constant current charge controller detects charge current and performs a constant current charging operation. A controller controls the constant voltage charge controller to perform the constant voltage charging operation during a period from when the charge voltage reaches a fully charged voltage to when the charge current decreases to a charge completion current. The controller suspends charging the battery when the constant voltage charging operation is being performed and detects whether or not the battery is coupled to the charging circuit based on the charge voltage during the charging suspension.