Understanding the different UPS systems

This is one of the latest online UPS designs and most widely used after the simple Double Conversion UPS. It was introduced to reduce the drawbacks of the Double Conversion design and increase the electrical efficiency, which is extremely important on high power systems.

This design is very similar to the Double Conversion design, except from the fact that the Delta Transformer also contributes to the output of the UPS, assisting the ever-working inverter. The major differences do not take place at the output of the UPS but at the input. The Delta conversion UPS provides dynamic control and power factor correction at the input, resulting in a significant reduction of energy loss. It also increases compatibility with other power equipment (e.g. generators) and severely reduces the need of over-sizing wiring and generators.

We are not going to get into too much detail about Delta Conversion UPS units because they are only available in sizes above 4kVA and range up to 2000kVA, meaning that they are designed for powering anything between a small business to a small city and not for home consumers. Furthermore this design is one of the few UPS designs protected by patents, which limits its availability and increases its price far beyond the financial capabilities of typical home consumers.

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