Static inverter with controlled core saturation

Details Static inverter with controlled core saturation Static inverter with controlled core saturation

1975-11-03

1977-01-11

Beha, Jr., William H.

Oscillators

Solid state active element oscillator

Transistors

321 2, 321 12, H03K 3281

Patent

active

040029999

ABSTRACT:
A static inverter is disclosed for d.c. to a.c. conversion comprising a pair of switching semiconductor devices and a power transformer having primary, secondary and control windings associated with a double apertured linear magnetic core. Each aperture partitions the core cross section in a localized region into two branches. The primary and secondary power windings encircle the full core, which has a closed magnetic path, while the control windings are associated with only a branch. Means are provided to cause one branch to saturate before the other branch and before full core saturation. Saturation of one branch is used to reduce the regenerative feedback and increase the degenerative feedback to provide an advance turn off, allowing charge stored in the switching device to dissipate prior to the end of each conduction period. This mode of the feedback control avoids full core saturation and avoids overstressing the switching devices that full core saturation would produce. The arrangement permits one to develop high power outputs from relatively inexpensive power transistors.

REFERENCES:
patent: 3541428 (1970-11-01), Schwartz
patent: 3611330 (1971-10-01), Cacossa
patent: 3914680 (1975-10-01), Hesler et al.
(S01070020) IEEE Transactions on Magnetics, vol. Mag-5, No. 4, pp. 908-912, Dec. 1969.

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