To energy saving LED has been a lot of promotion, but the LED power drive, good or bad will directly affect the life of the LED, and therefore how well an LED driver power supply is the most important designers of LED power . This article describes some of the LED driver power supply problem, engineers want to be able to provide a little help led driver.
A driver circuit direct impact on the LED life
We said LED driver to drive digital and analog drive two types of digital drive refers to the drive digital circuits, including digital dimming control, RGB full color changing. Analog drive refers to the analog circuitry drives, including AC constant current switching power supply, DC constant current control circuit. The driving circuit by the electronic components, including a semiconductor element, resistors, capacitors, inductors, etc., these elements have a life, failure of any one device will result in failure of the entire circuit, or part of the functions VALID. LED service life of 5-10 million hours count 50,000 hours of continuous light, nearly six years of life. The life of the switching power supply is difficult to achieve for six years, switching power supply available in the market, the warranty period is generally 2-3 years to achieve power in the 6-year warranty is a military level, the price is 4-6 times that of ordinary power general lighting plant is difficult to accept. Therefore, the failure of the G24 LED lamps are mostly the fault of the driver circuit.
2, the heat problem
LED cold light source, led driver the operating junction temperature can not exceed the limit, but also leave some margin in the design. The entire lighting design to be considered beautiful appearance, easy installation, with light, heat and so many aspects of the problem, to seek a balance of many factors, so that the overall lighting is the best LED lighting development time is not long, can learn from do not have much experience, and constantly improve the lot of the design. Some LED lighting manufacturers to use the power of outsourcing or outsourcing, the lighting designer on the power supply do not know much about the LED space for heat dissipation, heat to power less space led driver. Generally designed lamps, and then find the right power to bring some difficulty matching This gives the power of supporting. Often encounter less space inside the lamp or the internal temperature is high, and low cost control, and can not be assigned to the appropriate power. Some LED lamp factory power research and development capabilities, evaluate in the early design lighting, power supply design simultaneously, and will be able to solve the above problems. Consider the heat dissipation of LED heat dissipation and power to be integrated in the design, the overall control of the temperature rise of the lamp, so as to design better lighting.