Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1975-09-08
1977-10-25
Shoop, William M.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 79, 363 96, H02M 3315
Patent
active
040557910
ABSTRACT:
A switching type power supply is provided which includes a first and a second SCR with a diode connected in reverse across each of them. The first SCR-diode pair in response to a clock pulse charges a capacitor which when fully charged causes the first SCR current to return to zero, forward biases the first diode and commutates the first SCR off for at least the required minimum turn-off time of the SCR. After the capacitor reaches the peak charge value, the second SCR is selectively triggered to couple the desired portion of the stored energy to the power supply load via a transformer. After the currents in the secondary windings of the transformer reverse, and the capacitor achieves a peak charge of the opposite polarity, the current through the second SCR becomes zero, the second diode is forward biased, and the second SCR is commutated off. Thus, in steady-state operation, the first and the second SCR's will conduct alternately during the charging and discharging times of the capacitor, respectively, during each cycle. Also included in the power supply is an auxiliary feedback path, in addition to the constant voltage and current control feedback paths, to suppress the oscillation of the power supply when a load with a reactive impedance is utilized.
REFERENCES:
patent: 3303406 (1967-02-01), Bedford
patent: 3305794 (1967-02-01), Seelig
patent: 3316476 (1967-04-01), Olson et al.
patent: 3351779 (1967-11-01), Hehenkamp
patent: 3406327 (1968-10-01), Mapham et al.
patent: 3454863 (1969-07-01), Hintz et al.
patent: 3543130 (1970-11-01), Reijnders
patent: 3835364 (1974-09-01), Van Rooy
patent: 3881146 (1975-04-01), Wanlass
Bland Robert J.
Seipel Winfried
Fox Stephen P.
Hewlett--Packard Company
Jones Allston L.
Shoop William M.
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