Battery Overvoltage Cut-Off Circuit With Threshold-Triggered Power
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Solution Overview
Problem
Existing overvoltage protection circuits in battery packs consume significant power continuously, leading to increased self-discharge even when the battery is not in use, as they must constantly monitor voltage to prevent overcharging.
Innovation Solution
An overvoltage protection circuit with a power circuit unit connected between the battery and the cut-off circuit, where the cut-off circuit only operates when the battery voltage exceeds a predetermined value, and a voltage comparator judges whether to supply power to the cut-off circuit based on voltage thresholds, reducing unnecessary power consumption by integrating voltage measurement and control units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cut-off circuit continuously monitors battery voltage to prevent overcharging, then overvoltage protection reliability is improved, but power consumption increases
Solution Approach 1:
The protection circuit dynamically adjusts its monitoring behavior based on charging state. During charging, the circuit actively monitors voltage to provide reliable protection. When charging is complete or disconnected, the circuit transitions to a low-power state, dynamically adapting its operation mode to balance reliability and power consumption.
Solution Approach 2:
Instead of continuous monitoring, the circuit employs periodic voltage sampling during the charging process. The monitoring is activated at appropriate intervals when charging occurs, and deactivated when charging is complete, converting continuous action into periodic action to reduce overall power consumption while maintaining protection effectiveness.
2Reliability
If the cut-off circuit operates continuously to ensure battery safety, then protection effectiveness is improved, but self-discharge rate increases
Solution Approach 1:
The monitoring function is extracted and activated only when needed during charging operations. When the battery is not being charged or has reached full charge, the monitoring circuit is deactivated or placed in standby mode, removing the continuous energy drain while preserving protection capability when required.
Solution Approach 2:
The circuit discards continuous operation mode in favor of event-driven operation. Power consumption is recovered by deactivating the monitoring circuit during non-charging periods, converting the system from a continuous energy consumer to an on-demand operation that preserves battery charge.
3Device complexity
If voltage measurement and control units are integrated, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The voltage measurement unit and control unit are merged into a single integrated circuit. This consolidation reduces the overall device complexity, component count, and PCB space requirements. The integrated design maintains sufficient measurement precision for battery protection applications through optimized internal circuitry and calibration.
Solution Approach 2:
The integrated unit performs multiple functions: voltage measurement, threshold comparison, and control signal generation. This multi-functional design eliminates the need for separate dedicated circuits for each function, reducing overall system complexity while providing accurate voltage monitoring and protection control within a single component.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces power consumption by only activating the cut-off circuit during charging and integrating voltage measurement and control units, minimizing self-discharge when the battery is not in use and optimizing space.
Implementation Method 1
a voltage comparator judges whether to supply power to the cut-off circuit based on voltage thresholds
Data Source
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AI summary
Disclosed are an overvoltage protection circuit, a control method therefor and a battery pack that can reduce normal power consumption. To this end, the overvoltage protection circuit according to an embodiment of the present invention includes: a voltage measurement unit for measuring the voltage of a battery; a power control unit that supplies power if the battery voltage value measured in the voltage measurement unit is equal to or greater than a first predetermined voltage value; and a cut-off circuit unit that receives power supplied from the power control unit and cuts off the charge of the battery if the voltage value of the battery is equal to or greater than a second predetermined voltage value that is higher than the first voltage value.