Portable Device Detachment Detection Circuit for Power Converters
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power converters lack a reliable method to detect the detachment of portable devices, which is essential for managing power supply and load conditions effectively.
Innovation Solution
A circuit and method that includes a PD attachment detection circuit and a PD detachment detection circuit, utilizing a load detection circuit to generate an enabling signal for confirming attachment and detachment by monitoring voltage changes and pattern currents, and controlling a BUS switch to verify detachment through voltage drop detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If USB data lines are used for communication between portable devices and chargers, then adaptive power supply level change is enabled, but reliable detection of device detachment is not achieved
Solution Approach 1:
The detection function is segmented into two independent circuits: a PD attachment detection circuit that monitors data terminal voltage for attachment detection, and a PD detachment detection circuit that monitors bus voltage drops for detachment detection. This segmentation allows each circuit to specialize in one detection task, improving overall reliability while maintaining USB communication capabilities for adaptive power supply.
Solution Approach 2:
The bus voltage serves as an intermediary indicator for device detachment. Instead of directly detecting device presence through data lines, the system monitors changes in bus voltage caused by load removal, providing indirect but reliable detachment detection that works alongside USB communication protocols.
2Ease of operation
If traditional twisted-pair-cable chargers are replaced with USB cable chargers, then data communication capability is improved, but detachment detection functionality is lost
Solution Approach 1:
The patent merges USB data line communication functionality with traditional charger detachment detection functionality. The PD attachment detection circuit utilizes the existing USB data terminal voltage changes, while the PD detachment detection circuit monitors bus voltage, combining both approaches to achieve reliable detachment detection in USB-powered chargers.
Solution Approach 2:
The detection circuits are designed to work with USB cable connectors that have multiple functions: power transmission, data communication, and device presence detection. By making the charger circuit universal to handle all these functions, the system maintains ease of operation with USB cables while restoring accurate detachment detection capability.
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 accurate detection of portable device attachment and detachment, ensuring efficient power management and load condition monitoring, thereby improving the functionality of power converters.
Implementation Method 1
The PD detachment detection circuit confirms detachment of the portable device from the power converter by detecting a voltage drop of the bus voltage of the power converter
Data Source
AI summary
A method and a circuit of detecting attachment and detachment between a portable device and a power converter are provided. The method and the circuit confirm attachment of the portable device to the power converter and generate an attachment signal. The method and the circuit further detect a bus voltage of the power converter for confirming detachment of the portable device from the power converter.