Our people widly installed square wave UPS due to power break down problems. Many people have a problem of malfunctioning of fans dimmers which run on square wave UPS. I checked a fan running on square wave UPS by osciloscope and found that during swicthing on and off of transistor, fan produced high voltage spikes as "inductie kick back". I connected a 2.5uf capacitor with fan and found that high voltage spikes disapeared. Please see the below pictures. Now i want to ask that as a capacitor also creates a load on supply component, connecting a capacitor with fan in above mentioned condition put extra load on UPS? (2.5uf = 33VA almost)

