LED Sequencing via Parasitic Capacitance and Voltage Overshoot
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Solution Overview
Problem
Current sequencing methods for light-emitting diode lamp strings are complex and prone to errors due to the need for precise address sequence data programming, which can be difficult to achieve and result in incorrect lighting patterns if not arranged sequentially.
Innovation Solution
A sequencing method that involves sending an address pulse wave signal to light-emitting diode units, detecting voltage overshoot, and storing address sequence data when the receiving voltage is below a predetermined level, allowing for simplified sequencing by bypassing subsequent signals and adjusting the address pulse wave signal to ensure only the nearest unit to the switch unit receives the signal below the threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If address sequence data are burned into each light-emitting diode before assembly, then the light-emitting diodes can be driven to light diversely, but the sequencing method becomes very complicated and difficult
Solution Approach 1:
The patent extracts the sequencing function from the light-emitting diodes themselves and relocates it to a control device. Instead of embedding address sequence data in each LED during manufacturing, the control device generates address pulse wave signals that sequentially trigger each LED unit. This separates the sequencing logic from the individual components, simplifying the overall system while maintaining diverse lighting capabilities.
Solution Approach 2:
The patent introduces an intermediary mechanism (the control device generating address pulse wave signals) that mediates between the power source and the light-emitting diode units. This intermediary handles the sequencing logic externally, allowing the LED units themselves to remain simple components that only respond to voltage signals, thereby reducing complexity while enabling diverse lighting patterns.
2Adaptability or versatility
If light-emitting diodes are arranged sequentially based on address sequence data, then diverse lighting can be achieved, but incorrect arrangement results in incorrect lighting patterns
Solution Approach 1:
The patent employs feedback through voltage detection at each light-emitting diode unit. When an address pulse wave signal is applied, the control device detects the voltage response from each unit. Since each unit has different parasitic capacitive reactance and resistance-capacitance time constant, they produce distinct voltage responses that provide feedback to confirm correct identification and sequencing, ensuring accurate lighting patterns without requiring precise manual arrangement.
Solution Approach 2:
The patent utilizes parameter changes in the electrical characteristics of each light-emitting diode unit (specifically parasitic capacitive reactance and resistance-capacitance time constant) to enable automatic sequencing. By detecting voltage responses that vary based on these inherent electrical parameters, the system can automatically identify and sequence each unit correctly, eliminating the need for manual arrangement and ensuring reliable lighting patterns.
3Ease of operation
If address pulse wave signal voltage decreases, then a clamped voltage is sent to light-emitting diode units, but voltage overshoot causes receiving voltage to drop below predetermined level
Solution Approach 1:
The patent applies beforehand cushioning by introducing a clamped voltage in response to the address pulse wave signal voltage decrease. This clamped voltage acts as a compensatory measure that cushions against the voltage overshoot phenomenon, preventing the receiving voltage from dropping too far below the predetermined level and ensuring reliable detection despite the inherent voltage fluctuations in the system.
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 method simplifies the sequencing process by leveraging parasitic capacitive reactance and resistance-capacitance time constants to correctly identify and store address data, enabling accurate and efficient lighting patterns without the need for precise sequential arrangement of light-emitting diode units.
Implementation Method 1
The light-emitting diode unit detecting that the receiving voltage is less than a predetermined voltage due to an overshoot phenomenon stores the address pulse wave signal to have an address sequence data
Implementation Method 2
The light-emitting diode units have different parasitic capacitive reactance and resistance-capacitance time constant after being connected to each other in series
Data Source
AI summary
A sequencing method is applied to a light-emitting diode lamp string. The light-emitting diode lamp string includes a plurality of light-emitting diode units connected to each other in series. The light-emitting diode units have different parasitic capacitive reactance and resistance-capacitance time constant after being connected to each other in series. The sequencing method includes following steps. An address pulse wave signal is sent to the light-emitting diode units. A clamped voltage is sent to the light-emitting diode units when a voltage of the address pulse wave signal decreases. The light-emitting diode unit in a receiving status detects a receiving voltage of the light-emitting diode unit. The light-emitting diode unit detecting that the receiving voltage is less than a predetermined voltage due to an overshoot phenomenon stores the address pulse wave signal to have an address sequence data.