Direct Battery Charging Control With Sleep-Wake Current Compensation
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Solution Overview
Problem
Existing charging management systems for batteries lack efficiency during direct charging, leading to increased heat dissipation and prolonged charging times due to continuous resource usage and monitoring requirements.
Innovation Solution
A charging management chip and method that enters a sleep mode during the constant current period of direct charging, reducing resource usage and power consumption by periodically releasing the sleep mode to compensate for charging current differences and maintain charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the processor continuously monitors and controls charging current during direct charging, then charging precision and reliability are maintained, but power consumption increases and charging efficiency decreases
Solution Approach 1:
The processor enters a sleep mode during the constant current period of direct charging and periodically wakes up to compensate for differences between actual charging current and target charging current. This periodic monitoring and compensation mechanism reduces power consumption while maintaining charging reliability, resolving the contradiction between continuous monitoring and energy efficiency.
2Temperature
If the processor remains active throughout the charging process, then charging monitoring and compensation are continuous, but heat dissipation increases
Solution Approach 1:
The processor periodically wakes up from sleep mode during the constant current period to perform compensation operations, rather than remaining continuously active. This periodic operation reduces heat generation while maintaining adequate monitoring reliability through timely interventions to correct charging current deviations.
3Productivity
If the processor enters sleep mode during constant current period, then power consumption and heat dissipation are reduced, but charging current compensation may be delayed
Solution Approach 1:
The processor implements a feedback mechanism where it periodically wakes up to detect the actual charging current, compares it with the target charging current, and compensates for any differences by adjusting the power source output. This feedback loop maintains charging current accuracy while allowing the processor to remain in low-power sleep mode between compensation cycles, thus improving overall charging efficiency.
Solution Approach 2:
The system uses the processor's own periodic wake-up cycles to self-correct charging current deviations. The processor autonomously monitors charging status, identifies when compensation is needed, and executes compensation operations without external intervention, maintaining accuracy while minimizing active processing time.
Data Source
AI summary
An electronic device includes a charging integrated circuit (IC) including a direct charging circuit that charges a battery; and an application processor that issues a request to an external power source to output a maximum voltage corresponding to a target current, performs a ramp-up operation on a charging current input to the charging IC on the basis of the maximum voltage, compensates for a difference between the charging current and the target current in response to the charging current entering a constant current period, and enters a sleep mode during the constant current period in response to that the charging current reaching the target current.