USB-C Switching Circuit for PD and Non-PD Power Negotiation
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Solution Overview
Problem
Existing power receiving devices fail to establish a successful power agreement with power supply devices that do not support the Power Delivery (PD) mode, leading to incomplete charging and data transmission due to the inability to perform the PD mode protocol.
Innovation Solution
A switching circuit with a determination module and a mode switching module that determines whether a power supply device supports the PD mode based on the CC pin signal of a USB Type-C connector, generating switching signals to either disconnect or maintain connection with the PD controller, allowing the power receiving device to switch between PD and non-PD modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power receiving device waits for the PD mode protocol signal from the power supply device, then the PD mode protocol can be performed correctly, but the power receiving device cannot complete the power agreement when the power supply device does not support PD mode
Solution Approach 1:
The determination module performs preliminary detection through the CC pin to identify whether the power supply device supports PD mode before the power agreement process begins. Based on this preliminary information, the system proactively selects the appropriate communication mode (PD mode or non-PD mode), avoiding the problem of waiting indefinitely for a PD protocol signal that will never arrive from non-PD devices.
Solution Approach 2:
The system dynamically switches between different communication modes (PD mode and non-PD mode) based on the detected capabilities of the power supply device. The mode switching module adjusts the communication protocol in real-time according to the power supply device's support status, enabling the power receiving device to adapt its behavior to match the connected power supply device's capabilities.
2Ease of operation
If the power receiving device uses a fixed PD mode protocol, then the protocol execution is straightforward, but the device cannot communicate with power supply devices that do not support PD mode
Solution Approach 1:
The power receiving device incorporates multiple communication mode capabilities (both PD mode and non-PD mode) within a single device. The determination module detects the power supply device's capabilities, and the mode switching module selects the appropriate protocol, enabling the power receiving device to universally communicate with various types of power supply devices regardless of their PD mode support status.
Solution Approach 2:
The system changes the communication protocol parameters based on the detected power supply device type. When a non-PD device is detected, the system switches from PD mode protocol parameters to non-PD mode protocol parameters, allowing successful communication and power agreement completion with devices that do not support the PD specification.
Data Source
AI summary
A switching circuit is disposed on a power receiving device and is electrically connected to a Universal Serial Bus Type-C (USB Type-C) connector of the power receiving device. The switching circuit includes a determination module, a PD controller, and a mode switching module. The determination module is configured to: determine whether a power supply device supports a power delivery (PD) mode according to a pin signal of a configuration channel (CC) pin of the USB Type-C connector; and generate a first switching signal based on the fact that the power supply device does not support the PD mode. The PD controller is electrically connected to the pin signal determination module. The mode switching module is selectively electrically connected to the PD controller and configured to be disconnected from the PD controller based on the first switching signal.