USB Power Delivery Signal Tuning via Dynamic Switching Circuit
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Solution Overview
Problem
Existing USB interfaces face challenges in accurately detecting and managing power delivery signals, particularly in USB Type-C cables, which require precise voltage levels and signal adjustments to ensure proper communication and power negotiation across varying ground references and load conditions.
Innovation Solution
A USB interface with a transmitter circuit using a digital-to-analog converter and a receiver circuit with an analog-to-digital converter, coupled with a switching circuit that configures different operating modes for power delivery, built-in self-tests, and port detection, allowing for flexible signal routing and adjustments to meet USB specifications, including the use of a Direct Digital Synthesizer for stable clock signals and precise waveform generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a USB interface uses a dedicated transmission channel for power delivery negotiation, then power delivery capability is improved, but the complexity of signal routing and mode switching increases
Solution Approach 1:
The patent implements dynamic mode switching capability that allows the USB interface to transition between normal communication mode and built-in self-test modes. A switching circuit dynamically reconfigures the signal path to connect different components (transmitter, receiver, port detection circuit) to appropriate nodes (CC1, CC2) based on the current operating mode, thereby managing routing complexity through controlled adaptability rather than fixed complex wiring
Solution Approach 2:
The USB interface is designed with multi-functional capability to perform both normal power delivery negotiation and built-in self-test functions through the same hardware infrastructure. The switching circuit enables a single transmission channel to serve dual purposes: standard operation mode for power negotiation and test modes for system evaluation, reducing the need for separate dedicated circuits
2Reliability
If the USB interface implements built-in self-test modes, then system reliability is improved, but the device complexity increases due to additional switching configurations
Solution Approach 1:
The patent incorporates built-in self-test modes that perform preliminary diagnostic actions before full operation or upon detection of anomalies. The switching circuit pre-configures test signal paths that allow the transmitter to output test signals and the receiver or port detection circuit to evaluate them, enabling proactive reliability verification without adding permanent complex test hardware
Solution Approach 2:
The USB interface implements self-diagnostic capability where the system tests itself using its own components. The switching circuit enables the transmitter to generate test signals that are routed back through the receiver or port detection circuit, allowing the system to self-evaluate its functional integrity without external test equipment, thereby improving reliability through autonomous monitoring
3Adaptability or versatility
If the USB interface accommodates unknown ground references and load conditions, then adaptability is improved, but measurement precision of power delivery signals deteriorates
Solution Approach 1:
The patent introduces a port detection circuit as an intermediary component that mediates between the transmission channel and the unknown external environment (varying ground references and load conditions). This intermediary circuit evaluates port conditions and provides adaptive configuration, allowing the main power delivery negotiation to proceed with improved precision by isolating it from direct exposure to variable external conditions
Data Source
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AI summary
A USB interface to provide power delivery negotiated through a dedicated transmission channel includes a transmitter circuit including a digital-to-analog converter having an output coupled with an input of a transmission filter, a receiver circuit including an analog-to-digital converter having an input coupled with an output of a receiving filter, and a switching circuit configured in an operating mode of the USB interface to connect an output of the transmission filter and an input of the receiving filter to a connection node of the dedicated transmission channel.