USB Host-Mode Charging Port Bypass for Battery Self-Charge Prevention
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Solution Overview
Problem
Existing electronic devices with USB On-The-Go (USB HOST MODE) capabilities face challenges in efficiently managing power distribution between multiple charging ports, particularly when a USB HOST MODE peripheral device is connected, as the device's battery may inadvertently charge itself, leading to inefficiencies and potential damage.
Innovation Solution
A bypass circuit is implemented with a transistor and diodes to monitor voltage signals from multiple charging ports, ensuring that power is directed to the USB HOST MODE peripheral device while preventing the device's battery from charging, using a hardware and software combination to manage charging operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the device's battery is connected to multiple charging ports including USB HOST MODE port, then the battery can be charged from any port, but the battery may inadvertently charge itself when a USB HOST MODE peripheral device is connected, leading to power wastage and potential damage
Solution Approach 1:
A bypass circuit is introduced as an intermediary component between the charging ports and the battery. This bypass circuit includes transistors and diodes that act as controlled pathways, allowing the system to selectively route charging current either to the battery or to USB HOST MODE peripheral devices based on operational conditions, thereby preventing the battery from charging itself when it should be powering external devices
Solution Approach 2:
The charging system implements dynamic control through a controller that monitors the operational state and adjusts current distribution in real-time. The bypass circuit's transistors are dynamically switched based on whether the device is in battery charging mode or USB HOST MODE operation, enabling the system to adapt its power distribution architecture according to current needs and prevent energy wastage
2Adaptability or versatility
If the device supports USB HOST MODE to power external devices, then the device can act as a power source for peripherals, but the battery may be depleted while simultaneously trying to charge from a charging port
Solution Approach 1:
The bypass circuit serves as a mediator that isolates the battery from conflicting charging and discharging operations. When USB HOST MODE is active and the device is powering external peripherals, the bypass circuit prevents charging current from a connected charging port from being directed to the battery, thereby avoiding power management conflicts and maintaining system reliability
Solution Approach 2:
The controller implements feedback control by continuously monitoring the operational state of the device and the status of connected ports. Based on this feedback, the controller dynamically controls the bypass circuit to ensure that power is distributed appropriately - preventing the battery from charging when it should be supplying power to USB HOST MODE devices, thus maintaining power management stability
3Productivity
If a bypass circuit is implemented to prevent battery self-charging, then power distribution efficiency is improved, but the device complexity increases due to additional circuit components
Solution Approach 1:
The power management system is segmented into distinct functional pathways: a direct charging path from charging ports to the battery, and a controlled path through the bypass circuit for USB HOST MODE operations. This segmentation allows each pathway to be independently controlled and optimized, achieving efficient power distribution while keeping the added complexity localized to specific circuit segments rather than the entire system
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
Enables efficient power distribution to USB HOST MODE peripheral devices without charging the device's battery, maintaining a compact design and reducing power wastage, while allowing simultaneous charging from multiple ports.
Implementation Method 1
A bypass circuit is implemented with a transistor and diodes to monitor voltage signals from multiple charging ports
Implementation Method 2
A bypass circuit is implemented with a transistor and diodes to monitor voltage signals from multiple charging ports, ensuring that power is directed to the USB HOST MODE peripheral device while preventing the device's battery from charging
Data Source
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AI summary
An electronic device 201 may include a first charging port 202. A peripheral device 208 connected to the first charging port can be sensed. The first charging port can be electrically connected to a battery charger 218 of the electronic device by a first connection and configured to provide a charge to the battery charger through the first connection. The first charging port can be further electrically connected to a battery of the electronic device by a second connection and configured to receive a charge from the battery by the second connection. A charge (i.e., power) can be provided to the peripheral device from the battery through the second connection. A charge on the first connection can be directed away from the battery charger.