Light-Emitting Diode Driving System For Transmitting Signal Based On Power Line

What is this patent about?

’608 is related to the field of LED lighting control, specifically addressing the problem of unstable light emission in LED light strings powered via power lines. Existing systems often suffer from flickering or inconsistent brightness due to limitations in the signal generation circuitry, particularly when using Zener diodes which have weak current driving capabilities. The invention aims to provide a more stable and reliable driving system for LED light strings.

The underlying idea behind ’608 is to use a switch unit that alternates between a main power supply and a secondary power supply to drive the LED light string. This switching is controlled by a control unit that outputs high and low-level signals. By rapidly switching between two different DC power sources, the LED light string receives a more consistent and robust power signal, preventing the light string from turning off completely during signal transitions.

The claims of ’608 focus on a light-emitting diode driving system that includes a switch unit, a control unit, a main power supply, and a secondary power supply. The switch unit has inputs for both power supplies and an output connected to the LED light string. The control unit dictates which power supply is active, and the switch unit is designed to remain on at all times. The system ensures that the LED light string receives a continuous stream of power from either the main or secondary supply, thereby maintaining stable light emission.

In practice, the control unit, likely implemented with a microcontroller, generates a square wave signal. This signal controls the switch unit, which consists of two switches: one connected to the main power supply and the other to the secondary power supply. As the control signal alternates between high and low, the switch unit rapidly toggles between the two power supplies, creating a light emission driving signal that resembles a square wave. This ensures the LED string is always powered, preventing flickering.

The key differentiation from prior art lies in maintaining a constant 'on' state for the switch unit. Unlike systems that might momentarily cut power to the LED string during signal transitions, this design ensures a continuous power supply. By using two power supplies and rapidly switching between them, the system avoids the instability caused by weak signal generation circuits like those using Zener diodes. This results in a more stable and visually appealing light emission effect for the LED light string.