Battery Protection Circuit Power-On Reset Mechanism
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Solution Overview
Problem
Conventional battery protection circuits require a reset switch to return to a normal driving condition, limiting design flexibility as they remain in an OFF state after an abnormal condition is detected, necessitating battery disconnection and reconnection.
Innovation Solution
A battery protection circuit with a power-on-reset circuit and latch circuit that allows the protection switch to return to an ON state upon power supply restoration, enabling the detection stop switch to be turned back on, thus allowing the circuit to revert to a normal driving condition without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a reset switch is added to return the circuit to normal driving condition, then the circuit can be reset after abnormal condition, but the device complexity increases
Solution Approach 1:
The protection switch automatically resets itself when power is restored after an abnormal condition, eliminating the need for a separate reset switch. The system serves itself by using the power restoration event to trigger the reset sequence, thereby reducing device complexity while maintaining operational capability.
Solution Approach 2:
The control circuit is designed to automatically initiate the reset sequence upon detecting power restoration, before any manual intervention is needed. This preliminary automatic action eliminates the need for additional reset switches and simplifies the overall device structure.
2Reliability
If the protection switch remains in OFF state after abnormal condition detection, then battery protection is maintained, but the circuit cannot return to normal driving condition without manual intervention
Solution Approach 1:
The control circuit continuously monitors the power supply status and automatically triggers the reset sequence when power is restored. This feedback mechanism ensures that the protection switch returns to the ON state automatically, providing both reliable battery protection during abnormalities and automatic recovery when normal conditions resume.
Solution Approach 2:
The system automatically recovers from protective OFF state by detecting power restoration and initiating the reset sequence without requiring manual intervention. This self-service capability maintains battery protection reliability while enabling automatic return to normal operation.
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
Enables the protection switch to be returned to an active state by simply releasing and reconnecting the battery, enhancing design flexibility and eliminating the need for a reset switch.
Implementation Method 1
detection start upon start of power supply from the battery to the battery protection circuit
Implementation Method 2
a current detection resistor through which a current flows from a load in response to a current flowing in the load. The resistor generates a voltage in response to the current flowing in the load
Data Source
AI summary
A battery protection circuit includes an abnormal condition detection circuit having a resistor through which a current flows from a load in response to a current flowing in the load. The resistor generates a voltage in response to the current flowing in the load. The battery protection circuit further includes a control circuit having a detection stop switch configured to control the current flowing in the resistor from the load. The control circuit turns off the detection stop switch and a protection switch connected between the battery and the load when the abnormal condition detection circuit detects the abnormal condition according to the voltage generated by the resistor. The control circuit returns the detection stop switch to an ON state after returning the protection switch to an ON state in response to a start of supplying power from the battery to the battery protection circuit.