LED Luminaire Dimming Driver Circuit for Flicker-Free Operation
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Solution Overview
Problem
Existing LED luminaire dimming solutions face challenges with flickering due to incompatibility between power-line dimmers and LED luminaires, and most installed LED luminaires lack analog dimming ports, making them non-dimmable, necessitating a general-purpose dimming driver that can convert constant voltage into output DC voltage in response to dimming signals.
Innovation Solution
An LED luminaire dimming driver comprising a primary power supply circuit, an LED luminaire driving circuit, and a supplied voltage control circuit, which includes a relay switch and an optocoupler circuit to convert constant voltage into output DC voltage and control it based on PWM signals, allowing operation of external LED luminaires regardless of their dimmable design, and enabling seamless switching between line voltage and output DC voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power-line dimmers are used to control LED luminaires, then dimming capability is achieved, but flickering occurs due to incompatibility
Solution Approach 1:
The patent introduces a dimming driver circuit as an intermediary device between the power-line dimmer and the LED luminaire. This driver includes a rectifier bridge to convert AC to pulsating DC, a capacitor to smooth the voltage, and a controller to regulate the LED current based on the dimming signal, thereby eliminating the direct incompatibility between power-line dimmers and LED drivers and preventing flickering.
Solution Approach 2:
The patent changes the electrical parameters of the power supply by converting AC line voltage through rectification and filtering to produce smooth DC voltage, and then regulating the LED forward current based on the dimming signal. This parameter transformation allows the LED luminaire to respond smoothly to dimming commands without flickering.
2Device complexity
If LED luminaires are designed without analog dimming ports to simplify structure, then device complexity is reduced, but they become non-dimmable
Solution Approach 1:
The patent designs the dimming driver to be universally compatible with both dimmable and non-dimmable LED luminaires. The driver automatically detects the luminaire type and adjusts its output accordingly, providing both constant voltage mode for non-dimmable luminaires and constant current dimming mode for dimmable luminaires, thus adding versatility without requiring separate circuits.
Solution Approach 2:
The patent implements a dynamic control system where the driver can switch between different operating modes (constant voltage or constant current dimming) based on the connected luminaire's characteristics. The controller dynamically adjusts the output parameters to match the luminaire requirements, enabling retroactive dimming capability without structural modifications to existing luminaires.
3Ease of operation
If ballasts are used in LED luminaires to maintain compatibility with existing fixtures, then ease of installation is improved, but energy consumption increases and maintenance costs rise
Solution Approach 1:
The patent extracts and eliminates the ballast component from the lighting system by designing LED luminaires with integrated power supply circuits that directly accept AC line voltage. The dimming driver incorporates rectification and regulation functions that previously required separate ballast components, thereby removing the energy-wasting ballast while maintaining compatibility with existing AC-powered fixtures.
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
The solution effectively converts constant voltage into output DC voltage to drive external LED luminaires, ensuring dimmable operation without flickering, and allows for the conversion of non-dimmable LED luminaires into dimmable ones, enhancing energy efficiency and reducing maintenance costs by eliminating the need for ballasts.
Implementation Method 1
The optocoupler circuit comprises an optocoupler comprising an infrared emitting diode and a phototransistor configured to receive optical signals emitting from the infrared emitting diode
Implementation Method 2
Solid-state lighting from semiconductor LEDs has received much attention in general lighting applications today
Data Source
AI summary
A light-emitting diode (LED) luminaire dimming driver comprises a power supply circuit, a dimming interface circuit, an optocoupler circuit, an LED luminaire driving circuit, and a supplied voltage control circuit. The LED luminaire driving circuit is configured to automatically convert a constant voltage from the power supply circuit into an output DC voltage to dim an external LED luminaire in response to a dimming signal no matter whether the external LED luminaire is originally dimmable or not. The LED luminaire driving circuit is further configured to receive a pulse-width modulation (PWM) signal and to control a magnitude of the output DC voltage in response to the PWM signal. The supplied voltage control circuit comprises a relay switch configured to sense the dimming signal, to control switching between a line voltage from AC mains and the output DC voltage to operate the external LED luminaire without operational ambiguity.