Parsing multi-channel LED drive power supply technology and the key technologies

The LED as a new type of energy saving and no pollution source, due to its peculiar light lighting features, played a revolutionary role in modern lighting applications.

as LED lighting one of the most core components in the industrial chain, LED drive power supply drive control technology is low reliability and high cost of typical problems present always restricts the development of LED lighting. For multiple

LED drive power technology development and the reliability of the research is an important topic of the current industry. 1, LED drive current situation analysis of domestic and foreign general LED lighting is a remarkable characteristic, light source, usually by a large number of

more than LED chip, LED's own characteristics decided the LED is suitable for constant current driver, this has been the consensus of experts and scholars at home and abroad. LED drive mode single constant voltage output (mainly A built-in constant-current source light source) , the single constant current output, the constant voltage source configuration multi-track DC /

DC constant current output, etc. 1. 1 single output constant current drive the LED light source as a single set of load driven by single output power is the simplest way of LED driver control. Of the LED light source LED

there are a variety of connection. As shown in figure 1 is all the LED load series connection mode, single output power for constant current drive LED

light source characteristics. Due to the light source series, so there is no flow problem, but when LED series number is larger, the light source voltage will be increased, high light source voltage requirements higher cost of the insulation of the lamps and lanterns of the overall safety standards, the higher the radiator and insulation requirements of lamps and lanterns, thermal resistance is, the greater the heat dissipation effect of variation of

LED lights will affect service life. As improvements, are shown in figure 2 below LED lights for grid array structure, this structure can avoid light source voltage is too high, while the number of leds in parallel is larger, single lamp open, less effect on the whole LED lights, but this kind of single LED directly in parallel manner, the LED current balance is poor, which reduces the reliability of LED light source; One of the LED

short circuit at the same time, parallel with the LED will go out. As shown in figure 3.

the structure of parallel to each other again after LED series, in the absence of the LED failure, the flow characteristics of this structure is better than grid structure as shown in figure 2, but if some LED fault occurs, can cause serious among multiple series of LED

the current imbalance. The above analysis, single output constant current driver, applications have some limitations, especially of the LED light source in parallel connection mode of the service life and reliability of the light source will produce great influence.

1234 page from the rest in full