Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1986-04-14
1987-12-15
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
H02J 900
Patent
active
047135549
ABSTRACT:
An extended range regulated power supply which provides a constant output despite extreme variations in line potential, which in the present embodiment may exceed 50%. The power supply maintains high efficiency by operating with a first unregulated supply voltage just above the minimum voltage required by the linear regulator to maintain the desired output voltage. Upon severe low line or drop-out conditions, a second unregulated voltage supply is connected to the input of the linear regulators to maintain constant output voltage. Both of the unregulated potentials are derived from a transformer wherein the second unregulated source will be at least the voltage necessary for the regulators to maintain the desired output voltage under the maximum line drop-out voltage. The standby unregulated potential is switched by a solid state (FET) switch which acts instantaneously to provide a continuity of output voltage and may be configured to selectively switch in a range of standby potentials as well as a proportional pulse configured to provide modulated switching action.
REFERENCES:
patent: 3098963 (1963-07-01), Michaelis
patent: 4488057 (1984-12-01), Clarke
Blum Richard K.
Powercube Corporation
Shoop Jr. William M.
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