Design of Hybrid Safety relay system for Philips Instant fit LED Tubes(TLED)

Design of Hybrid Safety relay system for Philips Instant fit LED Tubes(TLED)

Andapally, B.R.

Popovic, J. (mentor)
Tao, H. (mentor)

Electrical Engineering, Mathematics and Computer Science

Electrical Sustainable Energy

Electrical Power Processing

2015-07-02

Fluorescent lamp has been a very successful source of light. Installed base of TL(Tube Linear) is huge; more than 60 percent of artificial light is being generated today by fluorescent tube. However in the past few years LED lighting technology has been rapidly developed. LED (Light emitting diode) is a new technology that has become more energy efficient compared to fluorescent tube giving more light- Lumens/watt. As LED technology is rapidly increasing, LED TL retrofit (TLED) is emerging as an attractive business to Philips from past years. This master thesis project is based on LED replacement tube called TLED-instant fit retrofit tube. This TLED product developed is a fast and easy way of upgrading old fluorescent tubes to LED tubes -just plug and play type and no rewiring of fixture required. This new lamp, enables fastest and easiest way to upgrade HF (High Frequency) TL luminaires and instantly provides about 40% energy saving. Normal TL tube lamps are safe due to the fact that the gas inside the tube first has to be ignited (combination of starter and ballast or HF generated high voltage) before there is a conductive path between the two connections on the end of the tube. This safety is necessary when the tube is being installed into a fixture while the voltage is not disconnected from the mains. But in case of using this newly designed TLED based (retrofit) lamps there is a conductive path between the two ends (the electronics) of the tube and safety is not guaranteed. Electronics are not considered as a proper isolation for safety. Hence the solution for solving this issue of safety is to use two electro mechanical relay combination in series with each other and HF ballast. Even though the two relay solution is solving present safety problems for customer, because of the internal built in architecture of these relays there is energy loss associated with them due to relay bouncing and arcing effect. The use of these two electromechanical relay solutions for TLED presently is a very costly solution for solving the pin safety issue .Hence the main motivation for writing this thesis is to evaluate the possibility of designing a new hybrid safety relay system, consisting of one electromechanical relay and other high voltage semiconductor switch to reduce the cost associated with use of two electro mechanical relay system and also to eliminate bouncing and arching effect involved by using just one electromechanical relay instead of two. In this thesis, first a brief literature survey is made on different solid state relays and high voltage semiconductor switches to choose the optimum switch for this project. A Hybrid relay system with one electromechanical relay and semiconductor switch was designed in simulation and hardware prototype is built and analyzed for its intended functionality. Next, the designed hybrid relay system was integrated to present TLED relay board by analyzing the present TLED internal electronic architecture in simulation and later integrating hardware model to TLED. The implemented hybrid relay system was tested and analyzed for its functionality considering few design trades off.

TLED
HF ballast
electromechanical relays

http://resolver.tudelft.nl/uuid:83a38429-a9d2-4de1-9bab-18cf9e7a6eb9

2019-07-02

Student theses

master thesis

(c) 2015 Andapally, B.R.