SNUBBER CIRCUIT, SWITCHING POWER-SUPPLY, AND SATURABLE INDUCTOR USED FOR THEM

摘要

A snubber circuit is possessed of a saturable inductor made of an amorphous alloy and connected in series to a drive circuit for a switching element. A switching power source is a flyback type self-excitation or separate excitation switching power source having a saturable inductor connected in series between a switching element connected in series to a primary winding of a transformer and a drive circuit for actuating the switching element. The saturable inductor connected in series to the switching element serves the purpose of improving efficiency and curbing noise. The saturable inductor of this invention is adapted for use in the snubber circuit and the switching power source mentioned above and has an exciting current, Iex, of not more than 3 (A) and an amount of magnetic flux, Φ (Wb/m2), in the range of from 2 to 20% of the product of the operating period, T (sec), multiplied by the circuit voltage (V).