Battery Protection Circuit Adjusts Reference Voltage to Stop Repetitive Switching
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Solution Overview
Problem
Conventional battery protection devices frequently deactivate and reactivate over-current protection due to load abnormalities, leading to repetitive activation and potential damage.
Innovation Solution
A battery protection device that adjusts a reference voltage or forms a discharge path based on a counting value of mode switches, preventing repetitive over-current protection activation by determining load abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional battery protection device compares voltage and activates over-current protection, then the battery set is protected from over-current damage, but the device may repetitively activate and deactivate protection due to load abnormalities
Solution Approach 1:
The patent applies dynamics by making the reference voltage adjustable based on the counting value. The control circuit dynamically changes the reference voltage from a first value to a second value when the counting value reaches a threshold, allowing the protection device to adapt its protection characteristics based on the frequency of mode switching, thereby preventing repetitive activation while maintaining protection reliability
Solution Approach 2:
The patent implements feedback through the control circuit that counts the number of times the protection device switches from normal mode to protection mode. This counting feedback mechanism allows the system to detect abnormal repetitive switching patterns and respond by adjusting the reference voltage or forming a discharge path, thus stabilizing the protection mode and preventing continuous oscillation between modes
2Reliability
If the battery protection device repeatedly switches between normal mode and protection mode, then it responds to over-current conditions, but it causes operational instability and potential damage due to repetitive activation
Solution Approach 1:
The patent applies preliminary action by establishing a counting mechanism that monitors mode switching frequency before problematic repetitive activation occurs. When the counting value reaches a predetermined threshold, the system proactively adjusts the reference voltage or forms a discharge path in advance, preventing the operational instability that would result from continued repetitive switching
Solution Approach 2:
The patent changes the reference voltage parameter from a fixed first value to an adjusted second value based on the counting value. This parameter change modifies the protection threshold dynamically, allowing the device to maintain reliable protection response while eliminating operational instability caused by repetitive mode switching under abnormal load conditions
Data Source
AI summary
A battery protection device adapted to be electrically connected to a load and a battery set and including a signal terminal, a discharge circuit and a control circuit is provided. The signal terminal is electrically connected to the load. The discharge circuit is electrically connected to the signal terminal. The control circuit detects a sensing voltage from the signal terminal, and counts a number of times that the battery protection device is switched to a protection mode from a normal mode, so as to obtain a counting value. The control circuit determines whether to enter the protection mode or the normal mode according to a reference voltage. In the protection mode, the control circuit adjusts the reference voltage or the control circuit controls the discharge circuit to form a discharge path passing through the signal terminal, the discharge circuit and a ground.