Control Circuit for Battery Power Supply with Dynamic Mode Selection
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Solution Overview
Problem
Battery-powered circuits face challenges in managing power supply when the external power adapter's rated power is exceeded, leading to potential damage due to high load currents, as existing technologies fail to efficiently switch between battery charging and power delivery modes.
Innovation Solution
A control circuit with a boost mode controller and a buck mode controller for a switch-type converter, which selects operation based on detected input and battery currents to maintain input current below thresholds, ensuring the external power supply's protection and efficient power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the external power supply operates in high load current mode to meet power demands, then the power delivery capability is improved, but the external power adapter may be damaged due to exceeding rated power
Solution Approach 1:
The system dynamically switches between buck mode and boost mode controllers based on real-time detection of input current and battery charging/discharging current. This dynamic adaptation allows the power supply to meet varying power demands while preventing adapter damage by engaging boost mode when input current exceeds the first threshold, thereby protecting the external power adapter.
2Productivity
If the system switches between buck mode and boost mode based on current detection, then the power management efficiency is improved, but the control circuit complexity increases
Solution Approach 1:
The control circuit is segmented into two specialized controllers: a buck mode controller for normal charging operations and a boost mode controller for protecting against overcurrent conditions. This segmentation allows each controller to be optimized for its specific function, improving power management efficiency while keeping individual controller complexities manageable through clear functional division.
Solution Approach 2:
A select circuit acts as an intermediary that automatically chooses between the buck mode controller and boost mode controller based on detected current values. This intermediary component simplifies the overall control architecture by providing a clear decision-making mechanism that routes control signals to the appropriate controller, thereby managing complexity through structured intermediation.
3Reliability
If the input current is limited to protect the external power supply, then the adapter protection is improved, but the power delivery to the load may be insufficient
Solution Approach 1:
The system merges the functionality of the external power supply and battery by enabling the battery to discharge through the boost mode controller when the external power supply cannot meet the load demand. This combination ensures that power delivery to the load is maintained at sufficient levels while the external power adapter is protected from overcurrent damage by limiting its output current below the first threshold.
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
The solution effectively manages power supply by reducing input current in boost mode and charging the battery in buck mode, protecting the external power supply and ensuring stable power delivery, thereby preventing adapter damage and optimizing power usage.
Implementation Method 1
a switch type converter comprising a first terminal coupled to a power supply line from an external power supply to a load, and a second terminal coupled to a battery
Data Source
AI summary
A control circuit can include: (i) a boost mode controller configured to control a switch type converter to operate in a boost mode such that an input current is less than a first input current threshold, where the switch type converter comprises a first terminal coupled to a power supply line from an external power supply to a load, and a second terminal coupled to a battery; (ii) a buck mode controller configured to control the switch type converter to operate in a buck mode; and (iii) a select circuit configured to select either the boost mode controller or the buck mode controller to control the switch type converter based on a detected value of the input current of the external power supply and a detected value of a battery charging/discharging current.