Type-A Data Cable Circuit for PD Charging Compatibility
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Solution Overview
Problem
Conventional data lines with Type-A ports do not support Power Delivery (PD) protocol charging, limiting their compatibility with devices that require fast charging using the PD communication protocol.
Innovation Solution
A data line with a Type-A port is equipped with a circuit identification module, including a pull-up resistor, switch circuit, and detection circuit, allowing the CC pin to be connected or disconnected based on the presence of a signal, enabling support for both PD and non-PD protocol charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a Type-A port data line uses D+/D- signal line for communication, then it maintains compatibility with conventional Type-A ports, but it cannot support PD protocol charging
Solution Approach 1:
The Type-A port is designed to support multiple communication protocols by incorporating both D+/D- pins for non-PD protocols and CC pins for PD protocol, allowing the same port to function in different charging modes based on detection results
Solution Approach 2:
A detection circuit acts as an intermediary between the CC pin and the switch circuit, detecting signals on the CC pin and converting them into control signals that determine the switching state, thereby enabling protocol identification and mode selection
2Adaptability or versatility
If a Type-A port is modified to support PD protocol by adding CC pin connection, then it gains PD protocol capability, but it increases device complexity
Solution Approach 1:
The detection circuit continuously monitors the CC pin for communication signals and provides feedback to the switch circuit, which automatically adjusts the connection state based on the detected signal presence, enabling automatic protocol selection without user intervention
Solution Approach 2:
The system performs self-identification of the charging protocol by detecting signals on the CC pin and automatically configuring the appropriate communication path, eliminating the need for manual selection or external control
Data Source
AI summary
A data line and a charging device are provided. The data line includes a Type-A port, a first port, a cable, and a circuit identification module. VBUS pins, D+ pins, D− pins, and GND pins in the Type-A port and the first port are connected in one-to-one correspondence. The circuit identification module includes a pull-up resistor, a switch circuit, and a detection circuit. A first terminal of the switch circuit is connected to the CC pin of the first port, a second terminal is connected to the VBUS pin through the pull-up resistor, a third terminal is connected to the CC pin of the Type-A port, an input terminal of the detection circuit is connected to the CC pin of the Type-A port, and an output terminal is connected to a control terminal of the switch circuit.