TLED Control Circuit Using AC-DC Converter for Universal Dimming
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Solution Overview
Problem
Conventional control methods for tubular light emitting diode (TLED) lamps are limited in simplicity, cost, performance, and controllability, especially for 'smart tube' retrofits, and power-line communications face propagation issues due to the power distribution system's inability to carry higher frequencies effectively.
Innovation Solution
A control circuit for TLED lamps that includes an input detection circuit to identify the type of control desired from input signals, a digital control circuit for digital lighting protocols, an analog control circuit for voltage-based control, and a microcontroller to enable or disable these circuits based on output signals, along with a voltage protection circuit that includes an AC to DC converter, allowing for compatibility with various control signals and voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power-line communications are used for control, then wireless convenience is achieved, but propagation is limited by the power distribution system's inability to carry higher frequencies
Solution Approach 1:
The patent introduces an AC-to-DC converter circuit as an intermediary component that processes control signals before they reach the LED driver. This converter acts as a mediator that adapts the AC power line signals into appropriate DC control voltages, enabling reliable communication without directly transmitting high-frequency signals through the power distribution system.
Solution Approach 2:
The patent replaces direct electronic signal transmission over AC power lines with an analog voltage-based control mechanism. Instead of using digital communication protocols that require high-frequency carrier signals, the system uses variable DC voltages (0-10V range) to control LED brightness, substituting the mechanical/electronic signal processing with a simpler voltage regulation approach.
2Adaptability or versatility
If multiple control circuits are integrated for versatility, then compatibility with various control signals is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal control interface that accepts multiple types of control signals (triac-based phase-cut dimming, 0-10V analog dimming, and digital protocols) through a single AC-to-DC converter circuit. The converter is designed to process different signal types using the same basic architecture, making the LED lamp compatible with various control systems without requiring separate dedicated circuits for each protocol.
Solution Approach 2:
The patent uses parameter changes in the control voltage (varying DC voltage levels from the AC-to-DC converter) to represent different control commands. By encoding control information in voltage magnitude rather than signal frequency or protocol-specific formats, the system can interpret multiple control types using a single parameter-based approach, reducing circuit complexity while maintaining versatility.
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 multiple dimming and color tuning capabilities, provides simple and affordable control options for existing systems, maintains high power factor and low total harmonic distortion, and operates universally across different voltage ranges, ensuring compatibility with both 2-wire and 3-wire electrical systems, while being secure from cybersecurity risks.
Implementation Method 1
The voltage protection circuit may include an AC to DC converter
Data Source
AI summary
According to one aspect, a control circuit for a tubular light emitting diode (TLED) lamp may include an input detection circuit that detects, from an input signal, a type of control desired based on a characteristic of the input signal and generate an output signal, a digital control circuit that controls operation according to a digital lighting protocol, and an analog control circuit that controls operation according to a voltage associated with the input signal. The digital control circuit may be enabled or disabled based on the output signal. The analog control circuit may be enabled or disabled based on the output signal.