Battery Charging Controller with ESR Voltage Drop Compensation
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Solution Overview
Problem
Conventional battery charging methods result in increased charging time due to voltage drops caused by equivalence serial resistance (ESR) in the charging path, which cannot be effectively compensated, leading to longer charging times and reduced battery lifespan when high charging currents are used to shorten charging time.
Innovation Solution
A method and apparatus that monitor the output values of the charger and battery in real-time, re-setting the charging voltage to compensate for voltage drops caused by resistance components, thereby reducing charging time without increasing charging current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If high charging current is used to decrease charging time, then charging time is reduced, but battery lifespan is rapidly decreased
Solution Approach 1:
The patent dynamically adjusts charging parameters (voltage and current) based on real-time monitoring of charging conditions and battery state. The controller modifies the charging voltage to compensate for voltage drops caused by ESR, allowing efficient charging without excessive current that would harm battery lifespan.
2Productivity
If charging voltage is increased to compensate for ESR voltage drop, then charging efficiency is improved, but battery overcharging risk increases
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors the charging voltage, current, and battery state. Based on this feedback, the controller dynamically adjusts the charging voltage to compensate for ESR effects while preventing overcharging, ensuring both charging efficiency and battery safety.
3Device complexity
If conventional charging method is used without ESR compensation, then system complexity is low, but charging time increases due to voltage drop
Solution Approach 1:
The patent introduces a controller as an intermediary component that actively manages the charging process. This controller calculates ESR-based voltage drops and compensates by adjusting the charging voltage, thereby reducing charging time without significantly increasing overall system complexity.
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 approach effectively decreases battery charging time by compensating for voltage drops, ensuring efficient charging while maintaining battery health by avoiding high currents that shorten lifespan.
Implementation Method 1
a charger configured to charge the battery according to a set charging voltage (V_SET) and a charging current (I_SET)
Implementation Method 2
a voltage drop occurs due to an ESR inside or between the charger unit 12 and the battery unit 13, that is, an internal resistance of a connector, a field effect transistor (FET) transistor, a routing, or the like
Data Source
AI summary
An apparatus for charging a battery of an electronic device is provided. The apparatus includes a battery configured to supply power to the electronic device; a charger configured to charge the battery according to a set charging voltage (V_SET) and a charging current (I_SET); and a controller configured to set the V_SET and the I_SET, and receive an output value of the charger or the battery during charging to re-set the V_SET if the output value corresponds to a pre-set reference range.