LED switching power supply and ordinary switching power supply, what is the difference?
LED switching power supply high-frequency is the direction of its development, high-frequency makes switching power supply miniaturisation, and make switching power supply into a wider range of applications, especially in the field of high-tech applications, promote the miniaturisation of high-tech products, lightweight. In addition, the development and application of switching power supply has important significance in saving energy, saving resources and protecting the environment.LED switching power supply in the application of electronic devices are mainly: LED diodes, IGBT and MOSFET.SCR has a small number of applications in the switching power supply input rectifier circuit and soft-start circuit, GTR driving difficulties, low switching frequency, and gradually replaced by IGBT and MOSFET.
The difference between LED switching power supply and ordinary switching power supply
The biggest difference is that LED power supply is a constant current source, and general switching power supply is a constant voltage source.
The design difficulty of LED switching power supply is volume and price.
LED switching power supply: 1. Requirements must be constant current. 2. low temperature and low heat long life. 3. small volume. 4. waterproof anti-corrosion anti-static. 5. high frequency pollution. Ordinary switching power supply high-frequency pollution is serious, the output DC even with an inductor and large capacitor filter, the waveform is very complex. Poor power supply, power supply itself may not be bad, but the LED life and light decay are greatly reduced.
LED switching power supply circuit is actually more by the switching power supply circuit + feedback circuit in the form of such a composition, feedback circuit from the load after sampling the switching circuit for the duty cycle of the pulse adjustment or frequency adjustment, in order to achieve the purpose of controlling the output of the switching circuit.
LED switching power supply of the three conditions
1, switching: power electronics working in the switching state rather than linear state
2, high-frequency: power electronics working at high frequency rather than close to the low frequency of the industrial frequency
3, DC: switching power supply output is DC rather than AC
