Integrated LED Driver Circuit with Bi-directional PLC Dimming
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Solution Overview
Problem
Conventional LED driver systems have inefficiencies due to separated and isolated control interfaces, leading to increased size, cost, and reduced conversion efficiency, especially when implementing bi-directional light-dimming functions.
Innovation Solution
An integrated LED driver circuit with a bi-directional power line communication unit, power conversion module, and constant current/constant voltage control unit, which eliminates the need for external dimming control interfaces by directly generating and processing light-dimming signals within a modular design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If external light-dimming control conversion units are connected to LED driver circuits, then light-dimming control functions can be implemented, but the system size, cost, and wire requirements increase
Solution Approach 1:
The patent combines the light-dimming control conversion unit and LED driver circuit into a single integrated module. The control conversion unit's microcontroller, optical coupler, and signal generator are merged with the driver circuit's power conversion and constant current/voltage control functions, eliminating external connections and reducing system complexity while maintaining full light-dimming control capability
Solution Approach 2:
The integrated module performs multiple functions within a single device: it handles power conversion from AC voltage, generates light-dimming control signals through bi-directional PLC communication, and provides constant current/voltage control for the LED string. This multi-functionality eliminates the need for separate external control units and various types of converters
2Adaptability or versatility
If multiple converters and external control units are used, then comprehensive control functions are achieved, but conversion efficiency decreases and costs increase
Solution Approach 1:
By merging the control conversion unit and driver circuit into one integrated module, the patent eliminates multiple signal conversion stages. The microcontroller directly generates control signals that are processed within the same module, reducing energy losses associated with external signal transmission and multiple conversion interfaces
3Adaptability or versatility
If external light-dimming control conversion units are used, then light-dimming control is achieved, but manufacturing cost and installation complexity increase
Solution Approach 1:
The integration of control conversion and driver circuit functions into a single module simplifies manufacturing to one assembly process rather than multiple separate component installations. The module comes pre-assembled with all necessary connections internal, reducing installation complexity from multiple wire connections to a single plug-and-play unit
Solution Approach 2:
The patent extracts the light-dimming control functionality from separate external units and incorporates it directly into the driver circuit module. This extraction eliminates the need for external control units, additional circuit wires, and complex installation procedures while maintaining full light-dimming control capability
Data Source
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AI summary
An integrated light-emitting diode driver circuit (10) includes a bi-directional power line communication unit (102), a power conversion module (104), and a constant current/constant voltage control unit (106). The bi-directional PLC unit (102) receives an AC voltage (Vac), and converts a modulation signal (Spwm) on the AC voltage (Vac) to generate a light-dimming control signal (Sdim). The power conversion module (104) receives the AC voltage (Vac) and converts the AC voltage (Vac) to generate an output voltage (Vo). The CC/CV control unit (106) receives the light-dimming control signal (Sdim) to generate a dimming constant current (Idim) or a dimming constant voltage (Vdim). The integrated LED driver circuit (10) outputs the dimming constant current (Idim) or the dimming constant voltage (Vdim) and the output voltage (Vo) to drive a LED string (20).