| 摘要 |
In prior art, the operation of the switching transistors Q1 and Q2 is within a range of class-AB to class-B and they are not good at efficiency since it is difficult to change the operating point thereof. There is disclosed an innovative switching power circuit which is self-oscillated by a tertiary winding N3 so that each of the pair of switching elements Q1 and Q2 may be conducted alternately and thereby a current flowing from the centertap is switched so as to selectively flow alternately to one side of the primary winding N1 or to other side thereof to generate an AC voltage on a secondary winding N2, said switching power circuit characterized by that an operating point of the switching elements Q1, Q2 is changed from that in starting by using a DC voltage generated by a switching operation of the switching elements Q1, Q2 as an inverse bias power source for the switching elements Q1, Q2.
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