Electricity: power supply or regulation systems – Including a transformer or an inductor
Reexamination Certificate
2000-05-09
2001-08-21
Nguyen, Matthew (Department: 2838)
Electricity: power supply or regulation systems
Including a transformer or an inductor
Reexamination Certificate
active
06278266
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to the reduction of electrical interference in the environment and in the operation of electronic equipment, and more specifically, to a generator power system that is uniquely configured and referenced to operate sensitive electronics and other impedance loads in a manner which inhibits the propagation of most electrical interference.
BACKGROUND OF THE INVENTION
Over the past several years, the use of symmetrical AC power has gained a foothold in some industries that are dependent on the field of power quality, the part of the electrical power industry that deals with the quality of power as it affects the performance of sensitive electronics. Conventional AC power, as it is presently being used, requires that at least one of the circuit wires be grounded as AC power is distributed to single-phase loads. In some cases, the frame or chassis of the load is used as a circuit conductor, similarly to how automobiles are typically wired, the chassis being not only used as a ground, but also a conductor through which current flows, to facilitate the operation of various electrical apparatuses in the vehicle. In similar situations, where a generator is used to power electronics, an analogous method of power distribution is used. One of the circuit wires is either grounded or is absent entirely in lieu of using the chassis or frame of the load as a circuit conductor. Consequently, reactive load currents flow through the frame or chassis. These currents often cause sensitive electronics to malfunction or to work improperly. One solution to the problem would be to install a symmetrical power transformer of the type described below and in the parent application (Ser. No. 08/848,123; “the parent application”) on the output of the generator, thus placing the grounding reference for the system at a point midway between the two “hot” conductors of the circuit and thusly balancing out or nulling reactive load currents.
The major drawback to this type of power system configuration is the additional weight and expense of adding a transformer to a generator's output. If for example, such a generator/transformer combination were to be connected to sensitive electronic equipment installed on an airplane, the weight and space requirements could pose difficult problems to overcome for aircraft designers.
SUMMARY OF THE INVENTION
A much more efficient and cost effective way of providing the same type of power is to utilize the output windings of the generator to configure an “isolation transformer” of the type described in
FIG. 4
below. This device then provides the benefits of symmetrical power in a generator environment without the extra weight and expense of a separate symmetrical power transformer.
An alternate configuration of the symmetrical power generator described herein is a similar generator with its output windings configured in a symmetrical power six-phase wye arrangement, as described in U.S. Pat. No. 5,969,510, to the inventor of the basic invention, and which is incorporated herein by reference.
The invention herein utilizes conventional generator designs and principles that are customarily used in the manufacture of generators with unbalanced outputs or generators who's output have been distributed in all unbalanced voltage manner by means of using a grounded circuit conductor. The primary distinction between prior art and this invention is the application of the symmetrical power output windings on the generator and the resulting symmetrical voltage output as it is fed through conventional means to sensitive electronics equipment and other sources of electrical noise that could cause malfunction in sensitive electronics.
REFERENCES:
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patent: 4675801 (1987-06-01), Terada
patent: 5140705 (1992-08-01), Kosuga
patent: 5386473 (1995-01-01), Harrison
patent: 5615091 (1997-03-01), Palatnik
patent: 5900764 (1999-05-01), Imam et al.
Morrison, “Grounding and Shielding Techniques in Instrumentation”; Dynamics Instrumentation Company; John Wiley and Sons, Inc.; New York, London, Sydney; pp. 81-85, 1967.
Larson & Taylor PLC
Nguyen Matthew
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