Design and realisation of a wireless LED lighting control logic

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Supervisor:
Moldován István
Department of Telecommunications and Media Informatics

In our new, modern and accelerating world we are searching for quick, simple and green solutions in all fields of our life. This trend did not leave the area of lighting industry out. As a result we needed such a new light source that can be integrated in various ways into different lighting systems. It has low power consumption and high luminous flux. We can choose its color temperature in a simple and wide spread way. It is operating on its maximum power level from the time it is powered on and tolerates oft switching well. In addition it has long lifetime. These criteria are fulfilled by the LED technology.

The changes in market needs resulted in a new approach, that nowadays most of the products sold on the markets are not single light sources but lighting systems. They are such solutions that are tuned according to customer’s needs. Different control systems came into the front, such as DALI (Digital Addressable Lighting Interface) interface or wireless solutions that can already found on the market.

My task was to make a market research on wireless solutions already on the market. Compare them and choose the most appropriate one for my work. I had to design the implementation of the chosen solution into a self-chosen General Electric retrofit LED bulb. I had to build the designed solution and to test it in industrial environment. The transmitter module has to be similar to the products already on the market. In addition to the wireless switching functionality I have to prepare the bulb to include the dimming functionality.

I chose the NXP JenNet-IP solution from the existing wireless solutions on the market because of the company’s and my own preferences, and because the network communication is done using an IP based self-organizing structure. I used two retrofit type GU10 bulbs from GE’s portfolio because of their outstanding performance and because of the lamp control IC (SSL2103) from NXP that is the base of the driver circuit. The two bulbs are two sequential generations of one family. Taking the place required for my task into consideration, my task was implemented using a hybrid solution that was built from these two generations so that I was able to implement the radio module.

The connection of the radio module (JN5148-J01-M03) to the lamp driver was done in two steps. First the conversion of the control signal was done in such a way that the lamp driver IC could receive the instructions and then the complete solution was implemented by designing and building a power supply. I needed a space saving solution with as less number of components as possible, which resulted in a low loss, as the heat dissipation is not solved in this bulb. I used a linear voltage regulator (78L33) and an optocoupler for this purpose. I made thermal measurements during the tests to see how the properties change according to the new design. It was important to prevent the LED from overheating to ensure proper lifetime and operating temperature of the LEDs. I also examined the range of the wireless connection, as I designed and built an antenna layout that is completely different from the reference design.

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