NFC LED Driver Wireless Dimming and Configuration
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Solution Overview
Problem
Existing LED drivers face limitations in configuring operating parameters without mains power and supporting continuous digital dimming due to the write endurance limits of non-volatile memory, which is not suitable for continuous data transfer in digital dimming interfaces.
Innovation Solution
Implementing a wireless communication interface using NFC for both configuration and digital dimming, leveraging volatile memory like SRAM for faster data transfer and eliminating the need for wired communication circuitry, thereby enabling configuration and dimming without mains input power and protecting against line voltage misapplication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-volatile memory (EEPROM) is used for data storage in the NFC interface, then configuration data can be stored without power, but the memory reaches its write endurance limit quickly (500k writes in 83 days) making it unsuitable for continuous digital dimming
Solution Approach 1:
The patent segments the memory function into two distinct components: non-volatile memory (EEPROM) for configuration data storage and volatile memory (SRAM) for continuous dimming data transfer. This segmentation allows each memory type to be optimized for its specific function, resolving the contradiction between data persistence and write endurance.
Solution Approach 2:
The patent introduces volatile memory (SRAM) as an intermediary buffer between the NFC interface and the controller. This intermediary allows continuous high-speed data transfer for dimming operations without directly writing to the non-volatile memory, thereby preserving the EEPROM's write endurance while maintaining configuration persistence.
2Productivity
If a wired digital dimming interface is implemented, then continuous data transfer for dimming control is achieved, but additional communication circuitry is required and protection against line voltage misapplication is needed
Solution Approach 1:
The patent replaces the mechanical/wired communication interface with a wireless NFC interface. This substitution eliminates the physical connection requirements, removing the need for wired communication circuitry and associated protection mechanisms while maintaining the capability for continuous data transfer at adequate speeds for dimming control.
Solution Approach 2:
The wireless NFC interface serves multiple functions: configuration data transfer, continuous dimming control, and firmware updates. This multi-functionality replaces what would traditionally require separate wired interfaces, reducing overall device complexity while maintaining productivity.
3Ease of operation
If LED drivers are configured before shipping without mains power, then ease of configuration is improved, but traditional wired interfaces require power for communication
Solution Approach 1:
The patent replaces the powered wired communication interface with a wireless NFC interface that can operate in passive mode. This substitution enables configuration operations without requiring the LED driver to be powered, as the NFC interface can be activated by the magnetic field from an external NFC reader, eliminating the power requirement barrier.
Solution Approach 2:
The NFC interface enables the LED driver to be configured autonomously without external power connection. The driver's internal NFC circuitry is activated by the external reader's magnetic field, allowing the device to service its own configuration needs without requiring mains power or additional power circuitry.
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
This solution provides a cost-effective, high-throughput, and memory-wear-out-resistant digital dimming interface that allows for real-time data transfer and firmware updates without the need for physical communication wires, enabling configuration and operation of LED drivers without mains power.
Implementation Method 1
a configuration device equipped with a Radio-frequency identification (RFID) transceiver IC and antenna
Implementation Method 2
volatile memory (e.g., SRAM) that is already built into many Tag ICs
Data Source
AI summary
A lighting device (e.g. LED driver) includes digital dimming, configuration and firmware updating via wireless communication circuitry and associated volatile memory (e.g., SRAM). A power stage converts AC mains input into a DC bus voltage, and further converts the DC bus voltage into output current for driving a load. A power distribution circuit generates a regulated DC voltage based on the DC bus voltage. A wireless interface circuit is linked to a wireless communications network (e.g., NFC), and configured to receive device configuration data during at least first operating conditions when the regulated DC voltage is unavailable, and further to receive dimming control data during second operating conditions when the regulated DC voltage is available. A controller generates gate driving signals for regulating the output current from the power stage, said gate driving signals generated based at least in part on the device configuration data and the dimming control data.