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AssigneeYutaka Electric Mfg. Co., Ltd.
InventorsRihei Hiramatsu, Shigeo Watanabe, Yasuyuki Okumura, Jun Maruyama
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A self-excited inverter circuit primarily includes a main transformer two switching elements e.g. the first and second (FET) switching elements, wherein capacitors at both ends of said first FET are charged during a time T.sub.1 -T.sub.2 when said first FET is turned off, and the voltage V.sub.g1 across said first FET is clamped by a charge voltage V.sub.c1 and then, a voltage V.sub.gs is applied across the gate and the source of said second FET for electrical continuity to cause the voltage to be clamped. The clamped state is maintained from T.sub.1 to T.sub.2, the saturation reactor is saturated at time T.sub.3, and V.sub.gs, which has been negative, starts to change toward O, thereby causing the first FET to change to ON; V.sub.q falls towards VPi at TP3 and further towards zero point. Thus, the voltage V.sub.q2 changes to zero to cause V.sub.gs of the second FET to become zero and the second FET to be shut off. When said voltage V.sub.q2 is clamped to a fixed value, a high -V.sub.sc (L) can be obtained in the case of Vi(L), whereas a low -V.sub.sc can be obtained in the case of Vi(H); and the continuity angle, or duty cycle, (T.sub.1 -T.sub.2)/(T.sub.1 -T.sub.3) of the first FET is naturally controlled to be kept in a desirable direction.
A continuity angle controlled self-excited inverter circuit comprising a main transformer, two switching elements, namely first and second switching elements, and a saturation transformer as the main components, wherein the voltage or current necessary for operating said two switching elements is supplied by supplying a voltage to said saturation transformer from a winding of said main transformer through an impedance element;
A continuity angle controlled self-excited inverter circuit comprising a main transformer, two switching elements, namely first and second switching elements, and a saturation reactor as the main components, wherein the voltage or the current necessary to operate said two switching elements is supplied by supplying a voltage to said saturation reactor from a winding of said main transformer through an impedance element so that the two switching elements perform a commutating operation respectively when said saturation reactor is saturated;
Dependencies are inferred from the claim text.