Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1978-03-23
1980-06-17
Shoop, William M.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 86, 361 58, H02M 118
Patent
active
042087082
ABSTRACT:
The current supplied by an AC power source to a DC load is controlled so that full current is supplied to the load during steady state operation and partial current is supplied during transient conditions. A selectively energized series switch, including first and second parallel branches, is connected between the power source and the load. An impedance in series with one of the switches causes the partial current to be supplied by the power source to the load. The other parallel branch includes no such impedance and therefore feeds full current to the load. A voltage threshold detection circuit, having hysteresis characteristics, responds to the amplitude of the AC source to activate the switches so that no current can be passed through the switches in response to the source amplitude being less than the threshold level. The switches are actuated so that the partial current is supplied by the source to the load in response to the source amplitude being greater than the threshold for an interval equal approximately to the duration of the transient conditions. The switches are activated so that full current is supplied by the source to the load in response to the source amplitude being greater than the threshold level for an interval at least equal to the interval required to reach steady state operation. Monostable multivibrators respond to the voltage threshold detection circuit to enable currents from the source to be supplied to the load for between one and two cycles of the AC source after the source amplitude drops below the threshold level and to prevent the switches from closing until approximately one half cycle of the AC source has elapsed since the source amplitude has risen above the threshold level.
REFERENCES:
patent: 3473039 (1969-10-01), Fegley
patent: 3678368 (1972-07-01), Popp
patent: 3816810 (1974-06-01), Friedman et al.
patent: 3821630 (1974-06-01), Kornrumpf et al.
patent: 3868562 (1975-02-01), Marshall
patent: 3935511 (1976-01-01), Boulanger et al.
Abraham Jean-Jacques
Pinson Denis
Compagnie Internationale pour l'Informatique
Shoop William M.
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