PURPOSE: To miniaturize the entire device and also to reduce power loss by leading out a terminal plate provided in each transformer and a center tap terminal plate to the same side of each transformer and also connecting them with a conductor when arranging at least two or more transformers equipped with rectifiers

CONSTITUTION: Four rooms 14a-14d are partitioned in the casing 12, made of Al, to store a transformer 10 equipped with rectifier, and in each room transformers 16a-16d are stored, respectively. Next, if stated only as to the transformer 16a since these transformers are all the same shape, a primary coil 20a is connected to AC currents not shown in the figure and both ends of a secondary coil 22a are provided with secondary electrode plate 14a, and this is arranged integrally at a terminal plate 30a through a rectifier 28a. Also, a center tap terminal plate 38a is led out integrally from the middle of the secondary coil 22a. This way, the transformers 16a and 16b are stored in the rooms 14a and 14b, and are arranged adjacently with a first connection part 36 and a second connection part 40a, and the transformers 16c and 16d are also arranged adjacently.