Battery Protection Chip Circuit for Compact Charge-Discharge Control
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Solution Overview
Problem
Existing battery charging circuits in rechargeable electronic devices require multiple components, leading to complex circuit designs, increased PCB area, and higher failure rates and production costs.
Innovation Solution
A simplified battery charge and discharge control system that integrates a power supply terminal, battery terminals, a charge and discharge circuit with a sampling resistor and battery protection chip, and a controllable switch circuit, eliminating the need for a charging management IC, thereby reducing circuit complexity and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a charging management IC, MCU, and battery protection chip are used to form a complete battery charging circuit, then the battery charging function is reliable, but the circuit design becomes complex and the PCB area increases
Solution Approach 1:
The patent combines the charging management IC and battery protection chip into a single integrated battery protection chip. This chip integrates multiple functions including charging management, overcharge protection, over-discharge protection, and short-circuit protection, thereby reducing the number of components while maintaining reliable battery charging functionality and simplifying the circuit design
Solution Approach 2:
The battery protection chip is designed to perform multiple functions simultaneously: it manages the charging process, provides overcharge protection, prevents over-discharge, and detects short-circuits. This multi-functional design eliminates the need for separate charging management IC and protection chip, reducing PCB area and circuit complexity while ensuring reliable operation
2Reliability
If a charging management IC, MCU, and battery protection chip are used to form a complete battery charging circuit, then the battery charging function is reliable, but the production cost increases
Solution Approach 1:
The patent combines the charging management IC and battery protection chip into a single integrated battery protection chip. This integration reduces the total number of components that need to be sourced, assembled, and tested, thereby lowering production costs while maintaining reliable battery charging functionality through the chip's comprehensive protection features
3Reliability
If a charging management IC, MCU, and battery protection chip are used to form a complete battery charging circuit, then the battery charging function is reliable, but the circuit board area increases
Solution Approach 1:
The patent integrates the charging management IC and battery protection chip into a single battery protection chip, significantly reducing the number of discrete components on the PCB. This integration directly reduces the PCB area required for the charging circuit while maintaining all necessary protection and management functions within the single chip
Data Source
AI summary
A battery charging/discharging control system and an electronic device, which relate to the technical field of battery charging/discharging. The control system includes: a positive power supply terminal, a negative power supply terminal, a positive battery terminal, a negative battery terminal, a charging/discharging circuit, and a controllable switching circuit. The charging/discharging circuit includes a first sample resistance circuit and a battery protection chip. One end of the first sample resistance circuit is connected to the negative power supply terminal, and there is a first node between the end of the first sample resistance circuit and the negative power supply terminal; and the other end of the first sample resistance circuit is connected to the negative battery terminal. The battery protection chip comprises an overcurrent detection pin, the overcurrent detection pin is connected to the first node.