Transformer Power Supply Design

Designing an efficient power supply circuit is not less of a challenge.

Transformer power supply design.

Those who have already worked with smps circuits would easily agree that the flyback transformer design plays a vital role in designing an efficient power supply circuit. A dual complementary rectifier is used to supply a positive and negative dc output of the same voltage. Most times these transformers are not available off the shelf in the exact same parameter that suits our design. For small loads it is possible to lower the voltage from 230 vac to a few volts 5 12 or 24 for example using only a current limiting resistor as you can see in the wiring diagram in figure 1 its efficiency is extremely low 1 because the energy is lost in heat on resistor r1.

It must power a 12v dc motor which runs for long periods of time and in normal use draws a maximum of 2a from the supply. It is not magic or a dream. Design and build a psu to run from 240v ac mains. We will need a transformer rated at 12v 2a 24w or more here you can see two possible transformer styles.

Power supply design notes. The transformer secondary voltage should be approximately 8 times the dc voltage of the unregulated power supply. This is another article of series about the design of power supply. We will analyze several hardware and simulation aspects.

For providing supply to low power circuits it is often useful to use a transformer less power supply solution. The transformer secondary rated current should be 1 8 times the dc current of the power supply. Power supply without transformer.