Type-A Data Cable CC Switching for PD Charging Compatibility
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Solution Overview
Problem
Data cables with Type-A interfaces do not support Power Delivery (PD) protocol charging, limiting their compatibility with devices that require fast charging.
Innovation Solution
A data cable with a Type-A interface is equipped with a circuit identification module, including a pull-up resistor, switch circuit, and filter circuit, allowing the CC pin to be connected or disconnected based on control signals, enabling support for both non-PD and PD protocol charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a data cable uses a Type-A interface with D+/D- signal lines for communication, then it maintains wide compatibility with existing devices, but it cannot support PD protocol charging
Solution Approach 1:
The data cable is designed with both Type-A and Type-C interfaces, enabling it to support multiple communication protocols (D+/D- and CC) and charging standards (non-PD and PD protocols). The cable can adaptively switch between different communication modes based on the connected device, achieving universal compatibility across different charging standards while maintaining wide device compatibility
Solution Approach 2:
A switch circuit is introduced as an intermediary component to control the connection between the CC pin and either the VBUS pin or the CC pin of the Type-C interface. This switch circuit acts as a mediator that routes communication signals appropriately based on the detected charging protocol, enabling the cable to support both PD and non-PD protocols without requiring complex circuit redesign
2Adaptability or versatility
If a data cable with Type-A interface is modified to support PD protocol by adding CC pin connection, then it gains fast charging capability, but it may cause signal interference or communication conflicts
Solution Approach 1:
The cable incorporates a detection mechanism that identifies the communication protocol supported by the connected device and provides feedback to the control circuit. Based on this feedback, the control circuit automatically configures the switch circuit to establish the appropriate signal path, ensuring stable communication without interference. This feedback-based adaptive configuration prevents signal conflicts by ensuring only the relevant communication pins are active
Solution Approach 2:
The cable employs dynamic switching capability where the connection configuration is not fixed but can change based on operational requirements. The switch circuit dynamically reconfigures the signal paths between different pins according to the detected charging protocol, allowing the cable to transition between supporting D+/D- communication and CC-based PD communication as needed, thereby maintaining signal stability across different operating modes
Data Source
AI summary
A data cable and a charging device. The data cable includes a Type-A interface, a first interface, and a cable, where a VBUS pin, a D+ pin, a D− pin, and a GND pin in each of the Type-A interface and the first interface are connected in a one-to-one correspondence; and the data cable is provided with a circuit identification module, where the circuit identification module includes a pull-up resistor, a switch circuit, and a filter circuit, a first terminal of the switch circuit is connected to a CC pin of the first interface, a second terminal is connected to a first terminal of the pull-up resistor, a third terminal is connected to a CC pin of the Type-A interface, where under the control of the filter circuit, the first terminal of the switch circuit is connected to the second terminal or the third terminal.