Transformer Power Supply 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.

Transformer power supply design.

Power supply design notes. Power supply without transformer. We will need a transformer rated at 12v 2a 24w or more here you can see two possible transformer styles. This is another article of series about the design of power supply.

For providing supply to low power circuits it is often useful to use a transformer less power supply solution. It is not magic or a dream. Design and build a psu to run from 240v ac mains. Core form design tends to as a general rule be more economical and therefore more prevalent than shell form design for high voltage power transformer applications at the lower end of their voltage and power rating ranges less than or equal to nominally 230 kv or 75 mva.

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. A dual complementary rectifier is used to supply a positive and negative dc output of the same voltage. 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. The transformer secondary voltage should be approximately 8 times the dc voltage of the unregulated power supply.

The transformer secondary rated current should be 1 8 times the dc current of the power supply. We will analyze several hardware and simulation aspects. Example design choosing components specification.