Dynamic Battery Voltage Detection Circuit for Over-Discharge Prevention
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Solution Overview
Problem
Existing battery detection methods in handheld devices often inaccurately determine over-discharge, leading to premature shutdowns and potential battery life reduction due to momentary voltage drops below predetermined levels.
Innovation Solution
A battery detection device comprising a voltage dividing circuit, filter circuit, and detection unit that compares output voltage with reference voltages specific to device states, switching between normal and abnormal detection modes to accurately assess battery capacity and maintain device functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the battery voltage is compared with a predetermined voltage to determine over-discharge, then the detection method is simple, but the detection accuracy is low leading to premature shutdowns
Solution Approach 1:
The patent applies dynamics by making the detection threshold dynamic rather than fixed. The reference voltage is adjusted based on the battery's charge state: when the battery is in a low-charge state, a higher reference voltage is used, and when the battery is in a high-charge state, a lower reference voltage is used. This dynamic adjustment allows accurate detection of abnormal voltage drops regardless of the battery's charge level, resolving the contradiction between simple detection and accurate measurement.
Solution Approach 2:
The patent changes the parameter of reference voltage based on the battery's charge state. By storing multiple reference voltages corresponding to different charge states and selecting the appropriate reference voltage for comparison, the system achieves accurate over-discharge detection across all charge levels while maintaining a relatively simple detection mechanism.
2Reliability
If the device shuts down when battery voltage falls below predetermined level, then data loss is prevented, but unnecessary shutdowns occur due to momentary voltage drops
Solution Approach 1:
The patent applies preliminary action by performing multiple preliminary voltage comparisons before triggering a shutdown. Instead of shutting down immediately when one voltage threshold is breached, the system performs sequential comparisons with different reference voltages corresponding to different charge states. Only after multiple comparisons confirm abnormal voltage drop does the system trigger shutdown, preventing premature shutdowns due to momentary voltage fluctuations while still protecting against actual over-discharge.
Solution Approach 2:
The patent uses feedback by continuously monitoring battery voltage and comparing it against dynamically selected reference voltages. The detection unit provides feedback about the voltage comparison results, and based on this feedback, the control unit determines whether to maintain operation or trigger shutdown. This feedback mechanism ensures reliable data protection while avoiding unnecessary shutdowns caused by transient voltage drops.
3Duration of action of stationary object
If over-discharge detection is performed to protect battery life, then battery longevity is extended, but false detection leads to reduced operational time
Solution Approach 1:
The patent applies dynamics by adjusting the detection criteria according to the battery's charge state. Different reference voltages are used for different charge levels, allowing the system to accurately detect true over-discharge conditions across the entire charge range. This prevents false detection that would prematurely end device operation, thereby extending usable operational time while still protecting battery life through accurate over-discharge prevention.
Data Source
AI summary
A state switching device for switching the states of a device by detecting a battery voltage of the device is provided. The device includes a voltage dividing circuit to provide an output voltage in proportion to the battery voltage, and a detection unit which includes a voltage detection module, a comparison module, a control module and a state detection module to obtain the device's state. The voltage detection module produces a digital detection voltage according to the output voltage at normal time intervals, the comparison module detects whether the digital detection voltage is lower than a reference voltage corresponding to the state. If yes, the voltage detection module obtains digital detection voltage at abnormal time intervals. The comparison module compares a predetermined number of digital detection voltages with the reference voltage to produce comparison results. The control module determines whether to maintain the device's state according to the comparison results.