Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1980-10-20
1982-06-08
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
331113A, 363 22, 363 56, H02M 7537
Patent
active
043342671
ABSTRACT:
A power transformer of an inverter power supply has a primary winding coupled to a source of DC voltage. First and second transistor switches are coupled to the primary winding in a push-pull arrangement. A drive winding of a saturable transformer is coupled to the base electrode of each of the two transistor switches to alternately apply forward drive to each switch. A control winding of the saturable transformer is supplied with a control current that reaches a magnitude that magnetically saturates the core of the saturable transformer to remove forward drive from the conducting transistor switch for developing an alternating polarity output voltage across a supply winding of the power transformer. A capacitor and an inductor form a resonant circuit upon attainment of core saturation. The voltage across the capacitor then commences a resonant oscillation, with the frequency of oscillation sufficiently low to supply a magnetizing current to the drive winding that maintains the core in saturation beyond the cessation of forward collector current in the conducting transistor switch and before forward collector current begins to flow in the other transistor switch.
REFERENCES:
patent: 3256495 (1966-06-01), Hunter
patent: 3350661 (1967-10-01), Bloom et al.
patent: 3361952 (1968-01-01), Bishop
patent: 3434036 (1969-03-01), Phillips
patent: 3448370 (1969-06-01), Harrigan
patent: 4047089 (1977-09-01), Suzuki et al.
"Semiconductor Power Circuits Handbook", Chapter 2, Motorola, Inc., 1968.
Beha Jr. William H.
Laks Joseph
Rasmussen Paul J.
RCA Corporation
Whitacre Eugene M.
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