The high frequency of LED switching power supply is the direction of its development. High frequency makes the switching power supply miniaturized, and makes the switching power supply enter a wider application field, especially in the application of high-tech fields, which promotes the miniaturization and portability of high-tech products. In addition, the development and application of switching power supply are of great significance in saving energy, saving resources and protecting the environment. The electronic devices used in LED switching power supplies are mainly: LED diodes, IGBTs and MOSFETs. SCR has a small amount of application in switching power supply input rectifier circuit and soft start circuit. GTR is difficult to drive and the switching frequency is low, so it is gradually replaced by IGBT and MOSFET.
A diferença entre LED comutação alimentação e comum comutação alimentação alimentação
The biggest difference is that the LED power supply is a constant current source, and the general switching power supply is a constant voltage source.
O design dificuldade de LED comutação alimentação é volume e preço.
LED switching power supply: 1. The requirement must be constant current. 2. Low temperature, low heat and long life. 3. Small size. 4. Waterproof, anti-corrosion and anti-static. 5. High frequency pollution. The high-frequency pollution of ordinary switching power supplies is serious, and the waveform of the output DC is very complicated even if it is filtered with an indutance and a large capacitor. Pobre energia fornecimento, o poder fornecimento si pode não ser ruim, mas o LED vida e luz decaimento são grande reduzidos.
In fact, the LED switching power supply circuit is mostly composed of switching power supply circuit plus feedback circuit. After the feedback circuit samples the load, it adjusts the duty cycle or frequency of the switching circuit to achieve the purpose of controlling the output of the switching circuit.
Having said so much, since the LED switching power supply is so good, what are the conditions for producing it?
Três condições para LED comutação alimentação alimentação
1. Switch: Power electronic devices work in a switch state instead of a linear state
2. alta frequência: Alimentação eletrônica dispositivos trabalho em alta frequência em vez de de baixa frequência fechar para industrial frequência
3. DC: O comutação alimentação alimentação saídas DC em vez de CA
