Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1984-07-27
1987-12-15
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 98, 363 49, 323901, H02M 3335
Patent
active
047137401
ABSTRACT:
A switch-mode power supply has first and second switching transistors connected in series together and in parallel with the primary of a power transformer which alternately connect the primary winding of the power transformer across a DC potential. The bases of the switching transistors are each connected to a separate secondary winding of a control transformer the primary of which receives a control signal. Simultaneous conductance of the switching transistors is prevented. A control circuit providing the control signal is powered initially from charge derived from the power supply primary circuit and stored on a capacitor. A Schmitt trigger connects the capacitor to power the control circuit when the voltage across the capacitor rises to above a first predetermined level. Once the power supply begins to operate, semi-regulated power from the secondary circuit of the supply is connected via the Schmitt trigger to power the control circuit output. Current limiting is provided to reduce the duty cycle of the switching transistors when an overcurrent occurs. When the voltage applied to power the control circuit falls below a second predetermined level, the Schmitt trigger disconnects the control circuit from the capacitor to shut down the power supply. The control circuit restarts automatically, providing a "burp mode" of operation. Supply output voltage is monitored by a comparator which is connected to the control circuit through an opto-coupler operated in a digital mode to provide high primary-to-second circuit isolation without requiring special circuit compensation.
REFERENCES:
patent: 3304489 (1967-02-01), Brolin et al.
patent: 3361955 (1968-01-01), Typke
patent: 3377540 (1968-04-01), Meyer
patent: 3378758 (1968-04-01), Goodenow
patent: 3443195 (1969-05-01), Hoffman, Jr. et al.
patent: 3559040 (1971-01-01), Fickenscher
patent: 3579090 (1971-05-01), Madsen
patent: 3600666 (1971-08-01), Gliever
patent: 3641424 (1972-02-01), Kuykendall
patent: 3660750 (1972-05-01), Businelli
patent: 3702434 (1972-11-01), Ryan
patent: 3838329 (1974-09-01), Michelet et al.
patent: 3975672 (1976-08-01), Lachocki
patent: 3983418 (1976-09-01), Wallace
patent: 3986052 (1976-10-01), Hunter
patent: 4001663 (1977-01-01), Bray
patent: 4030024 (1977-06-01), Chambers et al.
patent: 4060758 (1977-11-01), Wright
patent: 4087850 (1978-05-01), Koizumi
patent: 4092708 (1978-05-01), Gerding et al.
patent: 4129791 (1978-12-01), Sato
patent: 4150424 (1979-04-01), Nuechterlein
patent: 4160945 (1979-07-01), Schorr
patent: 4164014 (1979-08-01), Crow et al.
patent: 4209826 (1980-06-01), Priegnitz
patent: 4228493 (1980-10-01), de Sartre et al.
patent: 4233557 (1980-11-01), Alberkrack
patent: 4246634 (1981-01-01), Purol
patent: 4288831 (1981-09-01), Dolickian
patent: 4308576 (1981-12-01), Clark, Jr.
patent: 4308577 (1981-12-01), Mentler
patent: 4322785 (1982-03-01), Walker
patent: 4323961 (1982-04-01), Josephson
patent: 4342076 (1982-07-01), Rosswurm
patent: 4342956 (1982-08-01), Archer
patent: 4352153 (1982-09-01), Voyer
patent: 4378585 (1983-03-01), Bete
patent: 4400767 (1983-08-01), Fenter
Jones Judson H.
SMS Advanced Power, Inc.
Wong Peter S.
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