Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1976-06-28
1977-12-13
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 49, 363 56, H02P 1322
Patent
active
040633071
ABSTRACT:
A D.C. to D.C. converter including a start circuit having a choke with a primary winding and a start winding. A portion of the input power is fed through a section of the start winding to the base of a switching transistor connected in series with the primary winding. The transistor is operated as a blocking oscillator by the start circuit and a voltage is induced across a secondary winding of the choke. The secondary voltage is rectified and fed to the control input of a pulse width modulator. In response to a predetermined level of the secondary voltage, the output of the pulse width modulator is coupled to the base of the transistor and the start circuit disabled. Current overload and transient voltage protection circuits are also included.
REFERENCES:
patent: 3419781 (1968-12-01), Jullien-Davin et al.
patent: 3523235 (1970-08-01), Schaefer
patent: 3562668 (1971-02-01), Bartlett et al.
patent: 3843919 (1974-10-01), Yamamura et al.
patent: 3849716 (1974-11-01), DeBerg et al.
patent: 3879647 (1975-04-01), Hamilton et al.
IEEE Transactions on Industry Applications, vol. IA-8, No. 6, "A Hybrid Integrated PWM," Nov./Dec. 1972.
Albrecht J. C.
Beha Jr. William H.
Serp W. K.
Teletype Corporation
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