Single Converters

Single-conversion UPS systems are those in which, during normal operation, the incoming line is used to provide power to the critical load either through a transformer or in conjunction with some series impedance. Single-conversion UPS systems have an important role in providing continuous electrical power supply to critical applications such as medical equipment and telecommunications equipment.

Single-conversion UPS systems are those in which, during normal operation, the incoming line is used to provide power to the critical load either through a transformer or in conjunction with some series impedance. Some forms of single-conversion UPS products are classified as “line interactive”. They may be connected into a customer circuit via switchboards or automatic transfer switches (ATS). When there is a problem with the line (e.g., loss of voltage), any single-converter utility-powered UPS has the capability to interrupt power going to its critical load by means of a thyristor controller action that disconnects it from the source.

A line-interactive UPS system automatically diverts the incoming AC line current to a different load or battery when an outage, low battery condition or a single-conversion disconnect occurs. The system automatically switches to battery power and charges the backup battery to take over when the critical load is lost.

Single-conversion UPS systems convert line power to AC power via a transformer. This results in decreased noise, interference and harmonic distortion compared to parallel or series conversion units. Single-conversion UPS products are also typically cheaper than ot