USB-A to USB-C Cable Switching for PD Charging Compatibility
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Solution Overview
Problem
Data cables with a type-A interface do not support charging in the Power Delivery (PD) protocol, limiting compatibility with devices that require quick charging.
Innovation Solution
A data cable with both type-A and type-C interfaces, equipped with a circuit identification module that includes a switch circuit, filtering circuit, and voltage regulator circuit, allows the CC pin to be connected to either the type-C or VBUS pin, enabling both non-PD and PD protocol communication by controlling the switch circuit based on signal presence on the CC pin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a data cable uses a type-A interface with D+/D- signal cable for communication, then it maintains compatibility with non-PD protocol devices, but it cannot support charging in the PD protocol
Solution Approach 1:
The data cable is designed with both type-A and type-C interfaces, and the CC pin of the type-A interface can be connected to either the CC pin of the type-C interface or the VBUS pin through switch circuit control. This enables the cable to support both PD protocol charging (when connected to type-C devices) and non-PD protocol charging (when connected to type-A devices), achieving multi-functionality and universal compatibility across different device types
Solution Approach 2:
The cable incorporates a switch circuit that can dynamically change the connection state of the CC pin based on detection signals. When a PD protocol device is detected, the switch connects the CC pin to enable PD communication; when a non-PD device is detected, the switch redirects the CC pin to VBUS to maintain backward compatibility. This dynamic reconfiguration allows the cable to adapt its functionality based on the connected device
2Adaptability or versatility
If a type-A interface is modified to include a CC pin for PD protocol support, then PD protocol charging becomes possible, but the interface structure and signal routing become more complex
Solution Approach 1:
A circuit identification module is introduced as an intermediary component between the type-A interface and the charging circuitry. This module includes a switch circuit, filtering circuit, voltage regulator circuit, and comparator circuit that work together to detect the presence of devices, filter and regulate voltages, compare signals, and control the switch circuit to establish appropriate connections. This intermediary module manages the complexity of supporting multiple protocols while keeping the interface design relatively simple
Data Source
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AI summary
A data cable and a charging device belong to the field of communication technologies. The data cable includes a type-A interface (1) and a type-C interface (2), and the type-A interface (1) and the type-C interface (2) each include a VBUS pin, a CC pin, a D+ pin, a D- pin, and a GND pin. A circuit identification module (4) is disposed in the data cable, and the circuit identification module (4) includes a switch circuit (42), a filtering circuit (43), a voltage regulator circuit (41), and a comparator circuit (44). The switch circuit (42) is connected to a CC pin of the type-C interface (2), an output terminal of the voltage regulator circuit (41), a CC pin of the type-A interface (1), and an output terminal of the comparator circuit (44). Under the control of the comparator circuit (44), the switch circuit (42) connects the CC pin of the type-C interface (2) to the CC pin of the type-A interface (1) or the output terminal of the voltage regulator circuit (41).