External Battery MCU Integrates Protection to Reduce Circuit Complexity
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Solution Overview
Problem
Conventional external batteries rely on expensive protection circuit modules (PCMs) to prevent overcharging and over-discharging, increasing manufacturing costs and circuit complexity.
Innovation Solution
The use of a main controller unit (MCU) within the external battery to sense and control voltage and current, eliminating the need for a separate PCM by managing switches to prevent overcharging, over-discharging, and over-discharge currents, thereby simplifying the circuit and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate PCM circuit is used to protect the battery, then battery protection reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the battery protection function into the existing MCU by integrating voltage sensing, current sensing, and protection control capabilities. The MCU uses its existing ADC to sense battery voltage and measures current through the charging IC's output, eliminating the need for a separate PCM circuit while maintaining protection reliability.
Solution Approach 2:
The MCU is designed to perform multiple functions including system control, display management, and battery protection. By making the MCU universal and capable of handling protection tasks, the patent eliminates dedicated protection circuits while ensuring comprehensive battery safety through integrated voltage and current monitoring.
2Reliability
If a separate PCM circuit is used to protect the battery, then battery protection reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the battery protection function into the existing MCU by integrating voltage sensing, current sensing, and protection control capabilities. The MCU uses its existing ADC to sense battery voltage and measures current through the charging IC's output, eliminating the need for a separate PCM circuit while maintaining protection reliability.
Solution Approach 2:
The patent replaces the expensive PCM circuit with cost-effective sensing components. Current is measured through the existing charging IC output without requiring additional expensive protection circuitry, reducing manufacturing costs while maintaining adequate protection functionality.
3Measurement precision
If voltage sensing and display functions are duplicated by both MCU and PCM, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the voltage sensing function into the MCU's existing ADC capabilities. The MCU senses battery voltage through its ADC and uses this same sensing capability for both display updates and protection control, eliminating duplicate PCM sensing circuits while maintaining measurement precision.
Solution Approach 2:
The MCU is designed to perform multiple functions including system control, display management, and battery protection. By making the MCU universal and capable of handling protection tasks, the patent eliminates dedicated protection circuits while ensuring comprehensive battery safety through integrated voltage and current monitoring.
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 solution reduces the overall size and manufacturing costs of the external battery while effectively protecting the battery from overcharging and over-discharging, allowing for flexible firmware updates to accommodate different battery specifications.
Implementation Method 1
a DC-DC converter configured to convert an output voltage from the bare cell into a converted voltage of a magnitude that is different from that of the output voltage
Data Source
AI summary
An external battery includes an input end, an output end, a bare cell between the input end and the output end, a charging unit configured to deliver power from a charger to the bare cell via the input end, a first switch between the charging unit and the input end, a DC-DC converter configured to convert an output voltage from the bare cell into a converted voltage of a magnitude that is different from that of the output voltage, and configured to deliver the converted voltage to the output end, a second switch between the bare cell and the DC-DC converter, and a main controller unit (MCU) configured to sense at least one of overcharging, over-discharging, or an over-discharge current of the bare cell using the output voltage or an output current from the bare cell, and configured to control the first switch and the second switch.