LED Driver Bus Interface Signal Transposition
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Solution Overview
Problem
Existing light-emitting diode (LED) systems require complex wiring and often have limited diagnosis options due to the need for individual connections between control units and LED driver circuits, and data rates via LIN bus can be inadequate for efficient communication.
Innovation Solution
A light-emitting diode driver system that utilizes both differential and single-ended bus protocols, allowing for bidirectional communication and signal transposition between interfaces, enabling efficient power supply to LEDs while simplifying wiring and improving diagnosis capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual connections are used between control unit and LED driver circuits, then control precision is improved, but wiring complexity increases
Solution Approach 1:
The patent introduces a bus system as an intermediary communication medium between the control unit and LED driver circuits. Instead of direct individual connections, all communication passes through the bus, which handles addressing and routing. This mediator approach maintains precise control capability while dramatically reducing wiring complexity from multiple individual lines to a shared bus structure.
Solution Approach 2:
The bus system serves multiple functions simultaneously: it carries control signals, status information, and power; it supports multiple LED driver circuits through addressing; and it provides diagnostic capabilities. This multi-functional approach replaces numerous dedicated individual connections with a single versatile communication medium.
2Device complexity
If LIN bus is used for actuation, then wiring complexity is reduced, but data transmission rate decreases
Solution Approach 1:
The patent changes the communication parameter from LIN bus protocol to a differential bus protocol with higher data rates. This parameter change enables faster data transmission while maintaining the simplified wiring architecture. The differential signaling provides both high-speed capability and noise immunity, resolving the trade-off between wiring simplicity and transmission speed.
3Speed
If differential bus protocol is used, then data transmission rate is improved, but electromagnetic interference immunity may be affected
Solution Approach 1:
The patent applies differential signaling, which converts the potential harm of electromagnetic interference into a benefit. By using balanced differential pairs, the system exploits the symmetry to reject common-mode noise and electromagnetic interference. The high data rate is achieved through the differential protocol's inherent noise immunity, turning what could be a vulnerability into a strength.
Data Source
AI summary
According to one exemplary embodiment, a light-emitting diode driver is provided, having: a differential first interface, a single-ended second interface, wherein the light-emitting diode driver is configured to use the first interface to communicate according to a bidirectional differential bus communication protocol as a slave, to use the second interface to communicate according to a single-ended bus protocol and to transpose signals between the first interface and the second interface, and to supply one or more light-emitting diodes with electric power on the basis of signals received via the first interface.