Type-A Charging Cable CC Switching for PD Fast-Charge Compatibility
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Solution Overview
Problem
Conventional data lines with a Type-A interface do not support Power Delivery (PD) protocol charging, limiting the compatibility of charging devices that rely on the PD protocol.
Innovation Solution
A data line with a Type-A interface is enhanced by incorporating a circuit identification module, including a pull-up resistor, switch circuit, filter circuit, and comparator circuit, which allows the CC pin to connect or disconnect based on signal presence, enabling support for both non-PD and PD protocol charging by controlling the communication through the D+ and D- pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a data line uses a Type-A interface with conventional design, then it maintains wide compatibility and simple structure, but it cannot support PD protocol charging
Solution Approach 1:
The Type-A interface is designed to support multiple communication protocols (both PD protocol via CC pin and non-PD protocol via D+/D- pins) within a single interface structure, enabling the data line to function with both PD-compatible and traditional charging devices without requiring separate interface types
Solution Approach 2:
A switch circuit is introduced as an intermediary component that dynamically connects or disconnects the CC pin based on protocol detection, mediating between the PD protocol requirements and the conventional Type-A interface structure to enable conditional PD protocol support
2Adaptability or versatility
If a data line adds CC pin and circuit identification module to support PD protocol, then PD protocol charging is enabled, but the device complexity increases
Solution Approach 1:
The switch circuit dynamically changes its connection state based on the detected charging protocol type, connecting the CC pin to the D+ pin when PD protocol is detected and disconnecting it when non-PD protocol is used, allowing the circuit structure to adapt flexibly to different protocol requirements
Solution Approach 2:
The comparator circuit continuously monitors the voltage signal on the CC pin and provides feedback to control the switch circuit's state, creating a closed-loop control system that automatically adjusts the circuit configuration based on the detected protocol type
3Adaptability or versatility
If the CC pin is always connected to support PD protocol, then PD charging is enabled, but non-PD protocol communication may be interfered with
Solution Approach 1:
The circuit proactively prevents potential communication interference by disconnecting the CC pin from the D+ pin when non-PD protocol communication is detected, eliminating the risk of signal conflict before it can occur
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 PD protocol charging for devices with a Type-A interface, ensuring compatibility with devices that support fast charging, while maintaining support for non-PD protocol charging, thus expanding the range of compatible devices.
Implementation Method 1
the filter circuit filters a CC communication signal transmitted on the CC pin in the Type-A interface to obtain a stable analog signal
Implementation Method 2
the comparator circuit compares the analog signal to obtain a control signal
Implementation Method 3
a second end of the switch circuit is connected to a first end of the pull-up resistor
Data Source
Figure 1~2
Figure 3~4
AI summary
Disclosed are a data line and a charging device, which belong to the technical field of communications. The data line comprises a Type-A interface, a first interface, a cable and a circuit identification module, with a VBUS pin, a D+ pin, a D- pin and a GDN pin in the Type-A interface being correspondingly connected to those in the first interface; and the circuit identification module comprising a pull-up resistor, a switch circuit, a filter circuit and a comparator circuit, wherein a first end of the switch circuit is connected to a CC pin of the first interface, a second end thereof is connected to the VBUS pin of the first interface by means of the pull-up resistor, and a third end thereof is connected to a CC pin of the Type-A interface; a first end of the filter circuit is connected to the CC pin of the Type-A interface, and a second end thereof is connected to a first input end of the comparator circuit; a second input end of the comparator circuit is connected to the VBUS pin of the first interface, and an output end of the comparator circuit is connected to a control end of the switch circuit; and the comparator circuit controls the first end of the switch circuit to be connected to the second end or the third end thereof.