Transformer Power Supply Design Calculations

Uninterruptable power supply capacities.

Transformer power supply design calculations.

Power supply block diagram. Assuming an ideal transformer determine. The transformer secondary voltage should be approximately 8 times the dc voltage of the unregulated power supply. This is my zero crossing surge protected capacitive power supply design with voltage stabilizer i will try to list all of my doubts.

Assuming an ideal transformer determine a the primary and secondary full load currents b the transformer turns ratio. The initial design load connected to a transformer shall not exceed the following values of temperature rise according to iec 60076 2 reference ambient temperature 50 c. Stepping down voltage first step is is scale down the voltage by a step down transformer a step down transformer converts the 220 ac voltage to the lower ac voltage. Designing an improved capacitive power supply circuit with zero crossing detection.

Even though the transformer based power supply is efficient in providing sufficient current it consumes much space and makes the gadget bulky. Now clear a doubt. A 50 kva single phase transformer has a 4000 v primary side and a 400 v secondary side. Analyzing a capactive power supply.

Primary full load current i 1 50 1000. A dual complementary rectifier is used to supply a positive and negative dc output of the same voltage. A v 1 4000 v v 2 400 v transformer rating 50 kva v 1 i 1 v 2 i 2. Power system and equipment design calculations in plants.

The most common method is the use of a step down transformer to reduce 230v ac to a lower value ac. Top oil temperature rise 50k average. Transformerless capacitor power supply 12v 40ma. Transformer calculator example problem.

The x rated capacitor c1 is the core part of this power supply as it will drop the excess mains voltage across it. A 50 kva single phase transformer has a 4000 v primary and a 400 v secondary. I know this will be expensive for the capacitors but this is only for testing purposes. Maximum people thinks that a transformer give dc output voltage because we don t get shock by touching its output wire but this is totally wrong.

The 200ma fuse will protect the circuit from mains during shot circuit or component failures. This is then rectified and made ripple free by using a transformerless power supply. Referring to the diagram the various components involved are assigned with the following specific functions. The 275v mov metal oxide varistor will protect from power supply spikes or surges.