Charging Current Control via Impedance Segmentation
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Solution Overview
Problem
Quick charging technology leads to increased impedance in charging circuits, causing abnormal heating and potential burnout due to excessive local impedance, necessitating a method to control charging current effectively without reducing charging speed or extending charging time.
Innovation Solution
A charging current control method that determines a target impedance by combining first and second impedance values and adjusts the output current of the power supply device accordingly, excluding the impedance of the mainboard to avoid unnecessary adjustments and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If quick charging technology is continuously used to charge electronic devices, then charging speed is improved, but abnormal heating and severe burnout occur due to excessive local impedance
Solution Approach 1:
The patent segments the charging circuit impedance into two distinct parts: mainboard impedance and charging path impedance. By separately measuring and controlling only the charging path impedance (excluding mainboard impedance), the system can maintain quick charging current while preventing overheating in the charging path components. This segmentation allows selective impedance management without sacrificing charging speed.
Solution Approach 2:
The patent dynamically changes the impedance control parameter from total charging circuit impedance to isolated charging path impedance. By continuously monitoring and adjusting the charging current based on real-time charging path impedance measurements, the system adapts the current level to prevent overheating while maintaining optimal charging speed when conditions permit.
2Object-affected harmful factors
If charging current is adjusted according to total charging path impedance, then abnormal heating is prevented, but charging speed decreases due to mainboard impedance inclusion
Solution Approach 1:
The patent extracts the mainboard impedance component from the total charging circuit impedance measurement. By using differential measurement techniques to isolate and exclude the mainboard's impedance contribution, the system focuses control only on the charging path impedance. This extraction enables aggressive quick charging current levels while still preventing overheating in the charging path, as the mainboard's impedance variations no longer trigger unnecessary current reductions.
3Reliability
If quick charging current is reduced to control impedance heating, then local device burnout is prevented, but charging time becomes too long
Solution Approach 1:
The patent implements a feedback control mechanism that continuously monitors charging path impedance and dynamically adjusts charging current accordingly. When charging path impedance is low, the system maintains high quick charging current to minimize charging time. When impedance increases indicating potential overheating risk, the system reduces current to prevent device burnout. This real-time feedback loop optimizes both charging speed and device reliability without unnecessary conservative current reductions.
Data Source
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AI summary
The present application provides a charging current control method (200) and an electronic device (500). The method comprises: in the process of charging a battery, the electronic device determines a target impedance, wherein the target impedance comprises a first impedance and a second impedance, the first impedance is an impedance between an output of a power supply device and an input of a mainboard, the second impedance is an impedance between an output of the mainboard and an input of the battery, and the target impedance is less than a total impedance between the output of the power supply device and the input of the battery; and the electronic device sends indication information to the power supply device, wherein the indication information indicates that the power supply device adjusts an output current of the power supply device.