Electricity: power supply or regulation systems – External or operator controlled – Using a transformer or inductor as the final control device
Patent
1987-06-29
1989-08-01
Wong, Peter S.
Electricity: power supply or regulation systems
External or operator controlled
Using a transformer or inductor as the final control device
323328, 323338, 323247, 323253, 363 75, H01F 2914
Patent
active
048536113
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an inductive component. Furthermore, it relates to a process for the operation and the use of the component.
Inductive components are generally known as chokes, as inductive resistors, as signal transmitters, etc. Furthermore, their use in the context of electrical and electronic circuits is known. Their counterparts, as components of such circuits, are resistor and capacitor.
The decisive parameter of an inductive component with respect to a user signal is the relative permeability .mu..sub.r of its core material which, together with the square root of the winding number n of the winding, is proportional to the inductivity L of the component. The inductivity L, in turn, is the value of practical importance which is of interest to a technician in the circuitry and switching field.
Various possibilities exist with regard to the resistor and capacitor components that allow to change the coordinated values of resistance or, respectively, capacity, in a switching circuit in a linear and controllable way by electrical means. Examples of the electrically controllable resistor are the electronic tube, in particular the pentode, or the field effect transistor. An example of the electrically changeable capacitor is the semiconductor diode in a backward voltage connection.
The known electrically controllable inductive components such as variometer, magnetic amplifier, regulating inductor, etc., cannot be compared with the field effect transistor or semiconductor diode recited in the examples. These components operate essentially by exploiting non-linear magnetization curves, where the alternating currents to be controlled during each wave period pass through a substantial part of the magnetization curve and these currents drive the magnetic core for a longer or shorter time into saturation. This process is associated with a dramatic change of the wave shape in each case. Therefore, the recited inductive components can be compared more closely with the present-day phase control circuits such as, for example, those using thyristors.
SUMMARY OF THE INVENTION
It is the object of the invention to provide, as a counterpart to the electrically controllable resistors and capacitors, an inductive component for universal use in any electrical/electronic circuits, whose coefficient of self-induction L is independent of the signal, is constant, and can nevertheless be varied in wide ranges.
The solution of this object is given by the characterizing portions of the independent claims. This means, in short: There is provided an inductive component with a constant relative permeability .mu..sub.r as a user signal, whose value is variable over a range of at least 1:100.
This latter characterization sounds like the solution of a universal desire, which is in fact the case. The novel inductive component combines for its inductivity for the first time the five properties, independent of the signal, linear or, respectively, constant, electrically controllable, galvanically separated, and with a wide range of variability. These properties substantially distinguish the present inductive component from all known inductive elements.
The inductive component, according to the solution given of the invention object and the applications indicated, open the path to a multitude of different novel circuits, for which there has certainly existed a substantial need for a long time, but which circuits could hardly be realized up until now. The novel inductive component and its use in accordance to the invention are therefore suitable to provide new possibilities and thus a substantial boost to the electrical/electronic circuit technique.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is further described by means of the 13 exemplified figures that follow, where various references to the state of the art are given and the respective differences are stated. They show:
FIG. 1--General schematic view of a controllable inductive component
FIG. 2--Dependence of the magnetic flux density
REFERENCES:
patent: 2586657 (1952-02-01), Holt, Jr.
patent: 2773134 (1956-12-01), Dunnet
patent: 2782269 (1957-02-01), Grant
patent: 2802186 (1957-08-01), Dewitz
Hasler AG
Kasper Horst M.
Wong Peter S.
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