Switch mode power supplies are an extraordinary array of high frequency alternative.
These are the switching regulators that offers higher efficiency than the liner regulators. In addition, they can step-up, step-down and invert the input voltage.
A switching regulator is a circuit that uses an inductor, a transformer, and a capacitor as energy-storage element to transfer energy from input to output in discrete packets. Feedback circuitry regulates the energy transfer to maintain a constant voltage within the load limits of the circuit. They use some form of pulse-width modulation to alter the on time relative to the off time to effect control. The device is used in this to give the constraints of frequency and the speed are power ‘fets’
The use of power ‘fets’ with fast turn-on and turn-off characteristics have made switches that operate comfortable at frequency above 100khz practical.
There are two topologies are used
1. Forward converters
2. Flyback circuits.
Forward converters are used in medium and high power applications. They can be recognized by their power transformer and output choke.
Flybacks are favored for low power applications because they employ a transformer that doubles as the input choke .
Using a transformer as the energy-storage element also allows output voltage to be electrically isolated from the input voltage.
Model no. ---pe-ps-5v-10a
1. Output voltage : 12 vdc
2. Output current : 3 amp.
3. Input voltage : 140-250 vac
4. Ripple voltage : 50-80 mvdc
5. Efficiency : 92%
6. Output load regulation : 0. 10 to 0. 30 %
7. Approvals : ce approved
SMPS’s are having wide range of applications some of them are as-
- Machine tool industries
- Security systems (close circuit cameras)
- Where the size and weight very less is required
- Audio and vedio application
- Support supplies with plc’s
- In fountains.