JPS56111208A - Saturation type direct current transformer - Google Patents

Abstract

PURPOSE:To obtain a good output characteristic in a saturation type direct current transformer, by adding as a negative polarity the output of an auxiliary current transformer inserted in series to the tertiary winding to the output of the transformer. CONSTITUTION:Secondary windings 4A, 4B and tertiary short circuit windings 5A, 5B are applied to the iron cores 3A, 3B. And primary windings 2A, 2B are further applied. The windings 5A, 5B, a resistance R, a primary winding 11A of an auxiliary current transformer are connected in series. A resistance 12 is connected to a secondary circuit, and an alternating voltage is applied to the secondary windings 4A, 4B. If a little direct current exists in the primary windings 2A, 2B, a voltage -e0 takes place by means of the auxiliary current transformer. The secondary windings connect the terminals of positive polarity and are connected with the primary windings 7A of the auxiliary current transformer and the AC electric power source 6 in series. A single-phase full-wave rectifier 8 and a resistance 9 are connected to the secondary windings 7B and a voltage e2' is output. Because of this, e2'-e0 is obtained between the output terminals. With such an arrangement, because the commutation vibration of SCRI is suppressed, a proper output characteristic in direct proportion to the primary direct current Id is obtained.