Insulated LED Driver for Noise-Resistant PWM Dimming
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Solution Overview
Problem
Typical dimmable LED lighting systems face issues such as signal distortion due to external noise, electromagnetic interference, and failure of the entire system when one LED lighting apparatus malfunctions, along with limitations in controlling illuminance and color temperature, and difficulty in enabling or disabling dimming functions without complex jumper settings.
Innovation Solution
The solution involves electrically insulating dimmable LED lighting apparatuses from dimmers using insulation type signal transceivers that receive and transmit PWM dimming signals while maintaining electrical isolation, allowing individual control of LED groups with different color temperatures and enabling operation at maximum dimming levels even with dimmer or connection failures, and integrating sensors for smart illumination control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If LED lighting apparatuses are connected to dimmers via cable lines for simultaneous dimming control, then dimming control functionality is achieved, but signal distortion occurs due to external noise and electromagnetic interference
Solution Approach 1:
The patent introduces an optical isolation component (optical coupler) as an intermediary between the dimming signal source and the LED lighting apparatus. This optical mediator converts electrical dimming signals to optical signals for transmission, then back to electrical signals, effectively isolating the electrical circuits and preventing noise and electromagnetic interference from causing signal distortion while maintaining dimming control functionality
Solution Approach 2:
The patent replaces the traditional electrical signal transmission system with an optical signal transmission system using optical couplers. By substituting electrical fields with optical fields for signal transmission, the system eliminates electromagnetic interference and noise issues inherent in electrical cable connections, thereby improving signal transmission quality while preserving dimming control
2Ease of operation
If multiple LED lighting apparatuses are electrically connected to one dimmer via cable lines, then simultaneous dimming control is achieved, but the entire system fails when one apparatus malfunctions
Solution Approach 1:
The patent segments the electrical circuits of multiple LED lighting apparatuses by introducing optical isolation components into each connection. This segmentation isolates each apparatus's electrical circuit from others, so that a malfunction in one apparatus does not propagate to other apparatuses or the dimmer, while each apparatus still receives dimming control signals independently for simultaneous control functionality
Solution Approach 2:
The optical coupler acts as an intermediary that breaks the electrical continuity between the dimmer and multiple LED lighting apparatuses. By using optical signals as the medium for dimming control transmission, the system achieves both simultaneous dimming control and fault isolation, as each apparatus communicates with the dimmer through its own isolated optical channel
3Adaptability or versatility
If LED lighting apparatus requires jumper setting changes to enable or disable dimming function, then dimming function control is achieved, but the setting process becomes complex and difficult for unskilled persons
Solution Approach 1:
The patent implements a self-service mechanism where the LED lighting apparatus automatically detects the presence or absence of a dimming signal and adjusts its operating mode accordingly. When a dimming signal is detected through the optical coupler, the apparatus automatically enters dimming control mode; when no dimming signal is present, it automatically operates in full brightness mode. This eliminates the need for manual jumper setting changes, making the system adaptable to different modes while being easy to operate
Solution Approach 2:
The patent employs feedback mechanisms where the LED lighting apparatus continuously monitors the dimming signal input through the optical coupler and automatically adjusts its operation based on the detected signal state. This feedback-based automatic mode switching provides adaptability for different operating conditions while maintaining ease of operation, as users simply need to connect or disconnect the dimming signal without any complex settings
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 approach ensures reliable operation of LED lighting systems by preventing interference, allowing individual dimming control, and enabling various color temperatures and maximum dimming levels, while simplifying the use of dimming functions and integrating smart control based on sensor data.
Implementation Method 1
insulation type signal transceivers that receive and transmit PWM dimming signals while maintaining electrical isolation
Implementation Method 2
a first LED group to an nth LED group receiving the drive voltage and sequentially operating under control of the drive controller
Data Source
AI summary
A dimmable LED lighting apparatus including a power input unit generating drive voltage through rectification of received AC power and outputting the generated drive voltage to the drive controller, an insulation type signal transceiver receiving a pulse width modulation (PWM) signal output from a PWM dimmer and outputting the PWM signal to the drive controller, while electrically insulating the PWM dimmer from the drive controller, a first LED group to an nth LED group, n being a positive integer of 2 or greater, receiving the drive voltage and sequentially operating under control of the drive controller, and a drive controller controlling sequential operation of the first LED group to the nth LED group according to a voltage level of the drive voltage, determining a dimming level based on the received PWM dimming signal, and controlling dimming of the first LED group to the nth LED group based on the determined dimming level.