Battery Protection IC Power-Down Release Without Charger
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Solution Overview
Problem
Conventional secondary battery protection circuits require a charger to release the powered-down state, limiting usability due to the inability to do so without external connection.
Innovation Solution
A secondary battery protection integrated circuit that includes a discharge control transistor and a control circuit, which changes states based on potential level changes at an input terminal, allowing the discharge path to be blocked or unblocked, enabling the circuit to transition between normal and power save modes without a charger connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a charger is required to release the powered-down state, then power consumption is reduced during powered-down state, but usability deteriorates due to inability to release state without charger
Solution Approach 1:
The circuit enables self-release from powered-down state by detecting potential level changes at the input terminal. The control circuit monitors the input terminal potential and automatically turns on the discharge control transistor when a specific potential change is detected, eliminating the need for external charger intervention and allowing the circuit to serve itself for state release.
2Loss of energy
If the discharge path is blocked to reduce power consumption, then energy loss is reduced, but operational flexibility deteriorates
Solution Approach 1:
The discharge control transistor dynamically switches between on and off states based on input terminal potential level changes. The control circuit continuously monitors the input terminal and adjusts the discharge path blocking state in real-time, allowing the system to adapt between power-saving mode (transistor off) and operational mode (transistor on) according to detected potential changes, thereby maintaining operational flexibility while reducing power consumption.
Data Source
AI summary
A secondary battery protection integrated circuit includes a first power supply terminal, a second power supply terminal, an input terminal, an output terminal, and a control circuit. The control circuit turns a discharge control transistor off to change to a discharge-blocked state in which the output terminal and the first power supply terminal are coupled to each other, upon occurrence in a condition in which a potential level of the input terminal changes from a first level. The control circuit turns the discharge control transistor on in the discharge blocked state, upon occurrence of a condition in which the input terminal changes from a second level that is different from the first level.