Method of and Apparatus for Electrical Conversion and Distribution

The first specifically high frequency filing is the Patent US462,418 - Method of and Apparatus for Electrical Conversion and Distribution - November 3, 1891. A document Tesla himself frequently cross referenced, knowing that it was a completely new type of high-frequency lighting system. In it, Tesla states with pride two distinct novelties, firstly the speed of switching obtained, secondly the novel method by which the make and break is made. Tesla had developed a capacitor charge circuit, whereby the voltage in the capacitor accumulated until it was sufficient to break down a dielectric air gap.

METHOD OF AND APPARATUS FOR ELECTRICAL CONVERSION AND DISTRIBUTION.

SPECIFICATION forming part of Letters Patent No. 462,418,- dated November 3, 1891.

Application filed February 4, 1891. Serial No. 380,182. (No model.)

To all whom it may concern:

Be it known that I, NIKOLA TEsLA,-a' subject of the Emperor of Austria, from Smiljan, Lika, border country of Austria-Hungary, residing at New York, in the county and State of New York, have invented certain new and useful Improvements in Methods of and Apparatus for Electrical Conversionand Distribution, of which the 'followingis a specification, reference being had to the drawings accompanying and forming a part of the same.

This invention is an improvementin methods of and apparatus for electrical conversion, designed for the better and more economical distribution and application of electrical energy for general useful purposes.

Method of and Apparatus for Electrical Conversion and Distribution

Myinvention is based on certain electrical phenomena which have been observed by eminent scientists and recognized as due to laws which have been in a measure demonstrated, but which,so far'as I am aware,have not hitherto been utilized on applied with any practically useful results. Stated briefly, these phenomena are as follows: First, if a condenser or conductor possessing capacity he charged from a suitable, generator and discharged through a, circuit, the discharge under certain conditions will be of an intermittent or oscillatory character; second, if two points in an electric circuit through which a current rapidly rising and falling in strength is made to flow be connected with the plates or armatures of a condenseiy'a variation in the currents strength in the entire circuit or in a portion of the same only may be produced; third, the amount or character of such variation in the currents strength is dependent upon the condenser capacity, the self-induction and resistance of the circuit or 1 its sections, and the period or time rate of change of the current. It may be observed, however, that these several factorsthe capacity, the self-induction, resistance, and period-are all relatedin a manner well understood by electricians; butto render such conversion as may be effected by condensers practically available and useful it is desirable, chiefly on accountof the increased output and efliciency and reduced cost of the apparatus, to produce current-impulses succeeding each other with very great rapidity, or, in other words, to render the duration of each impulse, alternation, or oscillation of the current extremely small. To the many difliculties in the way of efiecting this mechanically, as by means of rotating switches or'interrupters, is perhaps due the failure to realize practically, at least to any marked degree, the advantages of which such a system is capable. To obviate these difficulties, I have in my present invention taken advantage of the fact above referred to, and which has been long recognized, that if a condenser or a conductor possessing capacity be charged from asuitable source and be discharged through a circuit the discharge under certain conditions, dependent on the capacity of the eondeuser or conductor, the selfinduction and resistance of the discharging circuit, and the rate of supply and decay of the electrical energy, may be eifccted intermittently or in the form of oscillations of extremely small period.

Briefly stated in general terms, the plan which I pursue in carrying out my invention is as follows:

I employ a generator, preferably, of very high tension and capable of yielding either direct or alternatingcurrents. This generator I connect up with a condenser or conductor of some capacity and discharge the accumulated electrical energy disruptively through an air-space or otherwise into a working circuit containing translating devices and, when required, condensers. These discharges may be of the same direction or alternating and intermittent, succeeding each other more or less rapidly or oscillating to and fro with extreme rapidity. In the working circuit, by reason of the condenser action, the current impulses or discharges of high tension and small volume are converted into currents of lower tension and greater volume. The production and application of a current of such rapid oscillations or alternations (the number maybe many millions per second) secures, among others, the following exceptional advantages: First, the capacity of the condensore for a given output is much diminished; second, the elliciency of the condensers is increased and the tendency to become heated reduced, and, third, the range of conversion is enlarged. I have thus succeeded in producing a system or method of conversion ICO radically different from what has been done heretoforcfirst, with respect to the number of impulses,alternations. or oscillations of cu rrent per unit of time, and, second, with respect to the manner in which the impulses are obtained. To express this result, I define the working current as one of an excessively small period or of an excessivelylarge nu mberot impulses or alternations or oscillations per unit of time, by which I mean not a thousand or even twenty or thirty thousand per second, but. manytimes that number, and one which is made intermittent, alternating, or oscillating of itself without the employment of mechanical devices. i now proceed to an explanation somewhat more in detail of the nature of my invention, referring to the accompanying drawings.

The two figures are diagrams, each representing a generating-circuit, a working .circuit, means for producing an intermittent or oscillating discha ge, and condensers arranged or combined as contemplated by my invention. in Figu re 1, A represents a generator of high tension; E B, the conductors which lead out from the same. To these conductors are connected the conductors C of a working circuit containing translating devices, such as incandescentlamps or motors G. In one or both conductors B is a break D, thetwo ends be ing separated by an air-space or a film of insulation, through which a disruptive discharge takes place. F is a condenser, the plates of which are connected to the generating-oi rcuit. if this circuit possess itself sufficient capacity, the condenser F may be dispensed with.

In Fig. 2 the generating-circuit B B contains a condenser F and discharges through the air-gaps D into the working circuit C, to any two points of which is connected a condenser E. The condenser E is-used to modify the currentin any part of the working circuit, such as L.

It may conduceto a better understanding of the invention to consider more in detail the conditions existing'in such asystem as is illustrated in Fig. 1. Let it be assumed, therefore, that in the system there shown the rate of supply of the electrical energy, the capacity, self-ind uction, and the resistance of the circuits are so related that a. disruptive,

' intermittent, or oscillating discharge occurs at D. Assume that the first-named takes place. This will evidently occur when the rate of supply from the generator is'not adequate to the capacity of the generator, conductors B B, and condenser F. Each time the condenser F is charged to such an extent that the potential or accumulated charge overcomes the'dielectric strength of the insulating-space at D the condenser is discharged. It is thenrecharged from the generator A, and this process is repeated in more or less rapid succession. The discharges will follow each other the more rapidly the more nearly the rateof supply from the generator equals the rate at which the circuit including the generator is capable of taking up and getting rid of the energy. Since the resistance and selfinduction of the working circuit C and the rapidity of the successive discharges may be varied at will, the current strength in the working and generating circuit may bear to one another any desired relation.

To understand the action of the local condenser E in Fig. 2, let a single discharge be first considered. This discharge has two paths offered-one to the condenser E, the other through the part L of the working c rcuit C. The part L, however, byvirtue of its self-ind notion, ofiers a strong opposition to such a sudden discharge, while the condenser, on the other hand, olters no such opposition. The result is that practically no current passes at first through the branch I, but presumably opposite electricities rush to the condenser-coatings, this storing for the moment electrical ener'gyin the condenser. Time -is gained bythis means, and the condenser then discharges through the branch L, this process being repeated for each discharge occurring at D. The amount of electrical energy stored in the condenser at each; charge is dependent upon the capacity of the com denser and the potential of its plates. it is evident, therefore, that the quicker the discharges succeed each other the smaller for a given output need be the capacity of the .condenser and the greater is also the efiiciency of the condenser. This is confirmed by practical results.

The discharges occurring at I), as stated, may be of the same direction or may be alternating, and in the former case the devices contained in the working circuitmaybe traversed by currents of the same or alternatelyopposite direction. It may be observed, however, that each intermittent discharge occurring at D may consist of a number of oscillations in the working circuit or branch L. l A periodically-oscillating discharge will occur at D in Fig. 1 when the quantities concerned bear a certain relation expressed in wellknown formulae and ascertained by simple experiment. In this case it is demonstrated in theory and practice that the ratio .of the strength of the current in the working to that in the generating circuits is the greater the greater the self-induction, and the smaller the resistance of the working circuit the smaller the period of oscillation.

I do notlimit myself to the use of any specific forms of the apparatus described in connection with this invention norto the precise arrangement of the system with respect to its details herein shown. in the drawings return-Wires are shown in the circuit; but it will be understood that in any case the ground may be conveniently used in lieu of the re turn-wire.

' What I claim is- 1. The method of electrical conversion herein described, which consists in charging acou- IIO denser or conductor possessing capacity and maintaining a succession of intermittent or oscillating disruptive discharges of said conductor into a working circuit containing translating devices. 'jf

In a system of electrical conversion, the combination of a generator or source of electricity and a. line or generating circuit containing a condenser or possessing capacity, and a working circuit ope'ratively connected with the generating-circuit through one or the working circuit will be maintained, as set forth.

NIKOLA TESLA,

Witnesses:

ROBT. F. GAYLORD PARKER W. PAGE.

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Method of and Apparatus for Electrical Conversion and Distribution Method of and Apparatus for Electrical Conversion and Distribution Reviewed by Re-programming Life on 6:13 AM Rating: 5

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