Design and Development of Flyback Power Supply Unit using InnoSwitch

DC-DC power supplies which supply a regulated DC output voltage to DC loads along with providing protection against short circuits and over-currents are called switch mode power supplies. Flyback topologyy is the widely used switch mode power supply topology in low power. This paper provides a step-by-step design of a flyback power supply unit for the required specifications. The aim of this flyback power supply unit is to power the logic circuits of Back-UPSs which are Schneider Electric’s line interactive type of UPS. An InnoSwich is used to switch the flyback converter instead of a MOSFET to have a better efficiency. InnoSwitch is a combination of an n-cannel power MOSFET, primary control and secondary feedback control. The designed flyback power supply unit is built, tested and the waveforms are captured for verification.