Power Path Switching for Stable Charging Port Detection
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Solution Overview
Problem
Portable electronic devices face issues with system power management, including unstable power supply when connected to USB-compliant standard downstream ports or USB On-The-Go devices, and system power perturbations during battery charging, especially with increased power consumption due to enhanced hardware and larger screens.
Innovation Solution
A method and apparatus for system power management that includes a communication port for obtaining power from an external source, a power path switching unit to control electrical connections between the system and battery, and a charging port detection circuit to switch between constant current and constant voltage modes based on voltage thresholds, ensuring stable power delivery and meeting specific charging profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the system power consumption is increased due to enhanced hardware speed and enlarged screen size, then the device performance is improved, but the power supply stability deteriorates
Solution Approach 1:
The patent implements dynamic power path switching that adapts to changing power conditions. The system continuously monitors battery voltage and external power availability, then dynamically reconfigures the power paths to maintain stable operation. This includes switching between battery-only mode, external power mode, and combined mode, as well as adjusting charging parameters in real-time based on voltage thresholds and power availability.
Solution Approach 2:
The system changes operating parameters based on detected conditions. When external power is detected, the system transitions from constant current charging to constant voltage charging, adjusting the charging current and voltage parameters to match the external power source capabilities and battery state, thereby maintaining stability under varying power conditions.
2Ease of operation
If conventional power management methods are used to allow device operation with deeply discharged or absent battery, then the device usability is improved, but system power perturbation occurs
Solution Approach 1:
The system performs preliminary detection of external power sources through the communication port before attempting to operate the device. The charging port detection circuit proactively identifies the presence and characteristics of external power sources, allowing the system to pre-configure appropriate power paths and charging parameters, thereby avoiding power instability that would occur with sudden battery disconnection or absence.
Solution Approach 2:
The patent introduces a power path switching unit as an intermediary between the battery and the system. This switching unit acts as a mediator that can isolate the system from battery voltage fluctuations while maintaining power supply continuity. When external power is available, the switching unit redirects power flow through the external power path, preventing battery-related perturbations from affecting system operation.
3Ease of operation
If the device is powered merely by USB-compliant standard downstream port or USB On-The-Go device without battery, then the device portability is improved, but power deficiency and instability occur
Solution Approach 1:
The system performs self-detection and self-adjustment when powered by external USB sources. The charging port detection circuit automatically identifies USB power sources and their capabilities, then the system self-configures the power management parameters accordingly. The controller adjusts charging currents and voltage regulation settings based on the detected USB power source characteristics, enabling stable operation without requiring manual intervention or battery supplementation.
Data Source
AI summary
A method and an apparatus for performing charging port detection control are provided, where the method is applied to an electronic device, a communication port of the electronic device has a functionality of obtaining power from an external power source for the electronic device, and a power path switching unit of the electronic device is arranged to control electrical connection between a system within the electronic device and a battery of the electronic device. The method may include the steps of: performing charging port detection; and control operation(s) according to the charging port detection. For example, the method may include: controlling the power path switching unit to have different configuration according to the charging port detection in order to charge the battery with different charging profiles; and detecting the system voltage level during charging for switching from the constant current mode to the constant voltage mode.