Battery Protection Chip Gate Control Without Diode Threshold Limits
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Solution Overview
Problem
Conventional battery protection systems rely on diodes, which are limited by threshold voltage, restricting their operational effectiveness in preventing overcharging and over-discharging.
Innovation Solution
A battery protection device and chip that utilize a power transistor controlled by a buffer circuit and switch circuit, eliminating the need for diodes by generating a gate control signal to turn off the power transistor during overcharging or over-discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diodes are used to protect the battery, then the battery protection function is provided, but the threshold voltage of the diode limits the operational effectiveness
Solution Approach 1:
The patent extracts and removes the diode component from the battery protection circuit, replacing it with a transistor-based protection circuit. This eliminates the threshold voltage limitation inherent in diodes while maintaining the battery protection function through voltage comparison and transistor control mechanisms.
Solution Approach 2:
The patent changes the operating parameters of the protection circuit by using transistors with adjustable threshold voltages instead of fixed diode threshold voltages. This allows the protection circuit to adapt to different battery types and operating conditions, improving both reliability and operational effectiveness.
2Reliability
If diodes are used to control the power transistor, then the protection function is achieved, but the response speed is limited by diode characteristics
Solution Approach 1:
The patent removes diodes from the control path of the power transistor and replaces them with transistors that can switch much faster. The voltage comparison output directly controls the power transistor gate, eliminating the slow diode switching characteristic and achieving rapid response to overcharge and over-discharge conditions.
3Speed
If a transistor-based protection circuit is used without diodes, then the response speed and control precision are improved, but the circuit complexity increases
Solution Approach 1:
The patent merges the voltage comparison function and the power transistor control function into an integrated circuit structure. The voltage comparison module and power transistor are closely coupled, with the comparison output directly controlling the transistor gate, reducing the need for separate diode components and external wiring, thereby simplifying the overall circuit despite the enhanced functionality.
Data Source
AI summary
A chip configured to protect a battery includes a buffer circuit and a switch circuit. The buffer circuit is configured to generate a gate control signal according to a first logic control signal, a first voltage, a second voltage, and a third voltage. The switch circuit is configured to transmit the second or the third voltage to the buffer circuit. The switch circuit includes an invert circuit and a select circuit. The invert circuit is configured to invert a second logic control signal to a third logic control signal. The select circuit is configured to select the second or third voltage to transmit the same to the buffer circuit according to the second logic control signal and the third logic control signal. The gate control signal is configured to turn off a power transistor when an overcharging or an over-discharging occurs.