Patent ID: 8890645

Claim:
A composite isolating transformer, comprising: a main winding rack including two winding portions coaxially formed to hold respectively a primary coil and a secondary coil, two connecting portions at two opposite ends of the two winding portions, a separating portion located between the two winding portions and including two spacers spaced from each other to form a separating section between them to separate the two winding portions, and an installation channel running through the two winding portions to hold an iron core set which is magnetically coupled with magnetic paths generated by the primary coil and the secondary coil when electricity is provided; and a support rack which is mounted onto the main winding rack and includes a first support half member and a second support half member that correspond to each other and couple together to encase at least one of the winding portions; the first support half member and the second support half member including respectively a first cover and a second cover corresponding to each other to cover two lateral sides of the winding portion, respectively a first insulating portion and a second insulating portion corresponding to the separating portion and extending towards the separating section to couple together, and respectively a first isolating portion and a second isolating portion extended from the first insulating portion and the second insulating portion towards the winding portion to cover another two lateral sides of the winding portion; wherein each of the two connecting portions includes a first retaining portion at the opening of one end of the installation channel and two latch recesses located at two sides of the first retaining portion, the first support half member and the second support half member including respectively a first latch portion and a second latch portion wedged in the two latch recesses and respectively a first positioning portion and a second positioning portion connecting to the first latch portion and the second latch portion to butt the first retaining portion.