LED Control Circuit Modulating Power Line Signals
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Solution Overview
Problem
Traditional LED lighting control methods require separate control pins or wires, wireless technologies, or master-slave modes, which limit flexibility and efficiency in controlling LED lights, especially when connected to variable power sources.
Innovation Solution
An LED lighting system with power analyzing and processing circuitry that identifies characteristics such as amplitude, frequency, and pulse width of the input power, compares them to preset criteria, and adjusts current control accordingly to control the LEDs, allowing for flexible and efficient lighting control without direct power source application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate control pins or wires are used to control LED lights, then control functionality is achieved, but device complexity and installation difficulty increase
Solution Approach 1:
The patent combines control functionality with the existing power supply wiring by detecting control information embedded in the power supply signal itself. This eliminates the need for separate control pins or wires, as the control data is transmitted through the same wires that deliver power to the LEDs, thereby reducing device complexity while maintaining control functionality.
Solution Approach 2:
The power supply wiring is made multi-functional by enabling it to serve both as a power delivery path and as a control signal transmission medium. The control information is modulated onto the power supply signal, allowing the same physical infrastructure to perform dual functions: supplying electrical power and conveying control commands for LED brightness and color adjustment.
2Device complexity
If master-slave mode is used where power source voltage directly controls LEDs, then control is simplified, but control flexibility and precision are reduced
Solution Approach 1:
The patent introduces a control information detection circuit as an intermediary between the power source and the LEDs. This circuit extracts control information from the power supply signal and uses it to regulate LED operation independently of the power source's voltage variations. This intermediary layer enables precise control flexibility while maintaining the simple master-slave structural relationship.
3Ease of manufacture
If power source voltage is directly applied to LEDs for control, then control implementation is simple, but control precision and independence from power variations are reduced
Solution Approach 1:
The patent implements a feedback mechanism where the control information detection circuit continuously monitors the power supply signal for embedded control data and adjusts LED operation accordingly. This feedback loop enables precise control independent of power source voltage fluctuations, as the system responds to explicit control commands rather than directly to voltage changes, maintaining both ease of implementation and control precision.
Data Source
AI summary
An LED control system is provided for connection to an LED lighting system via a power line to control the LED lighting system using commands formed by manipulation of frequency and amplitude of a signal transmitted over the power line. The signal may be for example a wave or a sequence of pulses. The signal may be provided in superposition with line power or the line power may be formed as the signal.