USB Adapter Resistor Pull-Up for Stable Charging
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Solution Overview
Problem
USB adapters for mobile devices often cause unstable operation and incorrect recognition of power supply, leading to malfunction when used without a computer, as they lack proper handling of D+ and D- terminals for data transmission.
Innovation Solution
A dedicated power supply apparatus with resistors connected between a regulator and signal lines to pull up the signal lines to a predetermined voltage, preventing incorrect recognition and ensuring stable operation, and a terminal with a detector and controller to determine the connection destination and adjust charging current accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If USB adapters use standard four-pin USB connectors with open D+ and D- terminals, then power supply function is achieved, but operation stability deteriorates due to incorrect device recognition
Solution Approach 1:
The patent introduces resistors as intermediary components connected between the regulator and the D+ and D- terminals. These resistors act as mediators that pull the signal lines to a predetermined voltage level, enabling the USB adapter to correctly identify itself to connected devices and prevent suspension states, thereby resolving the operation stability issue without requiring complex additional circuitry.
2Adaptability or versatility
If mobile devices are charged only via USB connections to computers, then device size is reduced and appearance is improved, but charging availability deteriorates when no computer is available
Solution Approach 1:
The patent creates a USB adapter that can function both as a power supply device and as a USB device itself. By incorporating resistors on the D+ and D- terminals, the adapter can correctly communicate with connected mobile devices, enabling the adapter to serve as a universal charging solution that works independently of computers while maintaining compatibility with USB charging standards.
3Measurement precision
If D+ and D- terminals are left open in USB adapters, then manufacturing is simplified, but device recognition accuracy deteriorates leading to suspension states
Solution Approach 1:
The patent applies preliminary action by pre-configuring resistors connected to the D+ and D- terminals before the USB adapter connects to a mobile device. This preliminary configuration ensures that the signal lines are already pulled to the correct voltage level, enabling accurate device recognition from the moment of connection and preventing suspension states without requiring complex post-connection configuration.
Data Source
AI summary
Disclosed is a physical processor. The processor is connected to an electronic device. The electronic device includes a rechargeable battery, a connector, and operation unit. The processor is configured to: determine whether an external device is a predetermined power supply apparatus; control communication with the external device so that the rechargeable battery is charged by a first current from the external device when the external device is the predetermined power supply apparatus; and control communication with the external device so that the rechargeable battery is charged by a second current from the external device when the external device is not the predetermined power supply apparatus. The second current is greater than the first current. The processor is further configured to control to playback content data stored in the electronic device based on a command from the operation unit by using power of the rechargeable battery.