Recently, the applications in which AC power supplies are used have changed. Until now, because it was mainly used for testing home appliances and office equipment, a high-power capacity of several kW was required. However, with the progress of electrification of automobiles and aircraft power systems, and the increase in capacity of air conditioners and power conditioners, electric power of 20 kW or more is required. The trend to increase the capacity of AC power supplies is expected to continue through the near future.
To meet this trend, AC power supplies essential for compliance test or endurance test are required to support the demands for high capacity and multifunction. The performance of the large capacity AC power supplies required to test these applications should be the same performance as the small capacity AC power supplies.