TRANSFORMER, AND INSULATED SWITCHING POWER SUPPLY USING THE SAME

摘要

PROBLEM TO BE SOLVED: To reduce variations in a secondary side voltage as much as possible even in a case that there is variations in excitation inductances of divided transformers.SOLUTION: A transformer 1 comprises a first transformer 2, a second transformer 3, and a voltage balance part 4. The first transformer 2 comprises a first primary winding 2a, and a first secondary winding 2b magnetically coupled with the first primary winding 2a. The second transformer 3 comprises a second primary winding 3a connected in series with the first primary winding 2a, and a second secondary winding 3b magnetically coupled with the second primary winding 3a. The voltage balance part 4 comprises a first tertiary winding 4a magnetically coupled with the first primary winding 2a, and a second tertiary winding 4b magnetically coupled with the second primary winding 3a. Both ends of the first and second tertiary windings 4a and 4b are connected with each other respectively via the same polarities.