| 摘要 |
<p>PURPOSE:To control the switching operation against the current through a main conductor by winding the auxiliary conductor in addition to the main conductor around a saturable iron core and by making a bias current flow through an auxiliary conductor according to the current through the main conductor. CONSTITUTION:In an auxiliary conductor 22, e.g., an enameled wire is sound N turns around a saturable reactor 20 and a variable bias power source 23 is connected to both the ends of the auxiliary conductor 22. In the variable reactor, the switching operation is determined by magnetic flux density of the sum of the magnetic flux Ni1 generated by the current i1 in a main conductor 21 and the magnetic flux Ni2 generated by the bias current i2 in the auxiliary conductor 22. Accordingly if the positive bias current i1 is increased, a magnetic switch can be made ON even if the current in the main conductor 21 is reduced. If the negative bias current i2 is given, the magnetic flux density is made low due to the generation of the reverse direction magnetic flux Ni1 even if the current in the main conductor 21 is increased and the magnetic switch is not made ON.</p> |
