the transformer including :1)inverter transformer, 2)SMD power transformer, 3)drive transformer, 4)high frequency transformer 5)low frequency transformer The Hign freqency transformer Mainly used in:1)switching power supply 2)DC/AC-AC Converter 3)DC/AC-AC inverter 4)Ballast 5)TV, Monitor; DSL. 8)Audio Visual equipment 9)Office Automation