Carry-Signal LED Drive Unit for Parasitic Capacitance Management
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Solution Overview
Problem
Existing LED light strings face issues with signal processing speed due to increased parasitic capacitance, leading to incorrect signal interpretation and malfunction when the number of LEDs in series is high, resulting in incomplete light control and unnecessary reset failures.
Innovation Solution
A carry-signal controlled LED light system with a drive unit that includes a light control unit capable of entering eco and sleep modes, utilizing an oscillator and latch unit to manage power consumption and signal processing, ensuring complete signal control and reducing parasitic capacitance effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of LEDs in series is increased to extend lighting coverage, then the lighting coverage is improved, but the parasitic capacitance increases causing signal processing speed to decrease and signal interpretation errors to increase
Solution Approach 1:
The patent divides the LED string into multiple segments with individual control capabilities. Each segment can be controlled independently, allowing the system to manage large numbers of LEDs while maintaining fast signal response times within each segment. This segmentation reduces the effective parasitic capacitance impact on signal processing speed.
Solution Approach 2:
The patent implements periodic carrier wave modulation for signal transmission. By using periodic carrier waves with specific frequencies, the system can maintain signal integrity over long LED strings while enabling rapid signal processing through synchronized periodic updates, effectively managing the trade-off between coverage and speed.
2Loss of information
If the discharge time is extended to ensure complete light control signal, then the signal completeness is improved, but the time width between cycles must be increased reducing the number of LEDs that can be driven
Solution Approach 1:
The patent incorporates a discharge unit that performs preliminary discharge of parasitic capacitance before the next signal cycle begins. This preliminary action ensures that the capacitance is fully discharged in advance, allowing the system to use shorter time widths between cycles while still achieving complete signal control, thereby increasing the number of LEDs that can be driven.
Solution Approach 2:
The patent uses rapid discharge mechanisms to quickly eliminate parasitic capacitance effects, rushing through the discharge phase much faster than natural discharge would allow. This enables the system to maintain short cycle time widths while ensuring complete signal control, increasing productivity by allowing more LEDs to be driven.
3Speed
If the light control signal voltage rapidly reduces to avoid incomplete discharge, then the signal processing speed is improved, but the voltage reaches the reset voltage causing unnecessary reset failures and malfunction
Solution Approach 1:
The patent introduces a discharge unit as an intermediary component between the light control signal and the LED string. This discharge unit actively manages the voltage reduction process, controlling it to proceed at an optimal rate that prevents both incomplete discharge and premature reaching of the reset voltage threshold, thereby maintaining both speed and reliability.
Solution Approach 2:
The patent implements feedback control where the discharge unit monitors the voltage level and adjusts the discharge rate accordingly. When the voltage approaches the reset voltage threshold, the feedback mechanism reduces the discharge rate, preventing unnecessary reset failures while maintaining fast signal processing speeds during normal operation.
4Measurement precision
If the time width between cycles is increased to allow natural discharge to reach low-level voltage, then the signal identification accuracy is improved, but the speed of changing lights/colors slows down
Solution Approach 1:
The patent replaces the passive natural discharge mechanism with an active electronic discharge unit. This substitution allows the system to achieve the same signal identification accuracy that would require long time widths, but with much faster discharge times, thereby maintaining high productivity and fast color-changing speeds without sacrificing measurement precision.
Data Source
AI summary
A carry-signal controlled LED light with low power consumption includes at least one LED and a drive unit. The drive unit is coupled to the at least one LED, and receives a carry light signal to control the at least one LED. The drive unit includes a light control unit. The light control unit drives the at least one LED according to a light command content of the carry light signal. When a voltage of the carry light signal is less than a low-level voltage, the light control unit enters an eco mode, and the light control unit detects and identifies signals within a time interval. After the time interval, the light control unit enters a sleep mode.