Transformer-isolated LED lamp driver

Abstract

The invention of the light emitter diode has revolutionized lifestyle of human. It changes the size of electronic product which becomes small and thin. Besides, many people purse low carbon life and environment protection. For this reasons, many people attach light emitter diode development and production. It becomes the age of light emitter diode. Although light emitter diode is able to match their requirement and is developed to emit different color, the LED lamp driver develop is too low so the efficiency of LED lamp driver does not high and it is easy fault or light emitter diode is always broken. In additional, the brightness of many strings of LED does not constant. Therefore above problems affect light emitter diode promotion. To solve LED lamp driver problem, many different LED lamp driver circuit are developed. This project focuses on developing transformer isolated LED lamp driver. Generally, there are offer four main characteristic which is safety, reliable, efficiency and brightness stable. In safety, it can handle fault mode to avoid dangerous occur. In reliable, the LED lamp driver can work a long time and keep the performance. In efficiency, high efficiency can reduce heat from the power transfer loss and increase lifetime of LED driver and LED. In brightness stable, even though the LED short or open, the LED driver can offer constant current to each strings to keep LED brightness.