Rajasthan Powergen, the leading transformer manufacturing company in India is providing the details as how the power transformers are different from the other transformer so that the customers have a clear idea of the required transformer for their needs.
Power transformers – Are alternating current devices which cannot support transformer operation from a fixed direct current voltage source. They are able to support transformer operation in transient conditions that permits reversal of transformer’s magnetic flux levels.
Switch mode power transformers – Are used in electronic applications, typically within a switch mode power supply. They have several secondary windings. A switch mode power supply is usually operated from a D.C. source. It has the ability to control the amount of power delivered to the load circuit of the transformer by controlling the amount of “on time” and “off time” of the switches. Various features are low wastage, high output power, low temperature rise and wide range of working frequency.
Switch mode power transformer design differs based on the type of circuit used.
The three main circuit configurations of switch mode power supply are Buck, Boost, and Flyback. Buck circuit: Acts as an ideal transformer and is also known as inverter, D.C. converter, forward converter, or feed forward. The switch mode power transformer used in the Buck Circuit couples energy from the primary side to the secondary side. Buck circuit switch mode power transformer couples energy without storing it.
Fly back and boost circuit: It store energy during the “on time” or charging cycle and then discharge energy during the “off time” or discharging cycle. As the Fly back and boost circuit intentionally store energy, the Fly back circuit switch mode power transformers and boost circuit switch mode power transformers do not function as ideal transformers.
Switch mode power transformers are available in a wide variety of shapes and sizes:
- They are used for Buck, Flyback, and Boost circuit configuration switch mode power supplies.
- The different shapes of switch mode power transformer are almost similar to that of an ideal transformer.
- The different shapes include “core with bobbin” structures and toroids. The “core with bobbin” structures include E core, EI core, EE core, EP core, ER core, ETD core, ERL core, EFD core, RM core, PQ core, POT core, U core, etc.
- EI and EE core type switch mode power transformers are used widely. EI and EE core type switch mode power transformers features high working frequency, wide range of working voltages, high output power, and good thermal stability. These types of switch mode power transformers are used in LCD power supply, program controlled switchboard, large power UPS inversion power supply, PC power supply and power supplies of small electronic equipments.
The ER, ETD and ERL core type switch mode power transformers features high output power, low wastage, wide range of working frequency, low temperature rise and stable performance. They are used in TV power supply, PC power supply, program controlled switch board, DVD power supply.
RM, EP, PQ and EFD core type switch power transformers having low magnetic leakage, low wastage and low distribute capacitance. They are used in program controlled switchboard, facsimile machine.
