US1587512A - High-frequency transformer - Google Patents

High-frequency transformer Download PDF

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Publication number
US1587512A
US1587512A US519325A US51932521A US1587512A US 1587512 A US1587512 A US 1587512A US 519325 A US519325 A US 519325A US 51932521 A US51932521 A US 51932521A US 1587512 A US1587512 A US 1587512A
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frequency
circuit
primary circuit
frequency transformer
transformer
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US519325A
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Dornig Walter
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B19/00—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source
    • H03B19/03—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source using non-linear inductance

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  • the invention relates to high frequency transformers such as used for wireless telegwell known, two separated iron cores or paths for the lines of force are necessary on which, when there are continuous current windings and secondary windings wound in the same direction, the primary currents are connected in the opposite direction. Consequently the ensuing secondary voltage of doubled frequency will not react on the primary circuit, only the difference between the two cores being effective.
  • the direction of winding of the primary and of secondary is the same, so also the voltage of the secondary frequency corresponding to the transformation ratio of the transformer obtains on the primary terminals and permits a current to flow through the primary circuit in accordance with the resistance. It is preferred, however, for different reasons, for example, in order to obtain as flat a resonance curve as possible and a low voltage or to avoid the cost of induction coils, to use in the individual resonance circuits as high capacities as possible without self induction coils, except possibly, only a small variometcr in order to bridge over the condenser unit.
  • choking coils are connected in the primary circuit which coils may be used also for tuning but they are of such size that the 1mpedanee of the primary circuit to the voltage of higher frequency amounts to a resistance which in relation to the working circuit is at least double.
  • the drawing shows by way of example an electrical diagram of the system according to the invention.
  • 1 is the oscillation producer
  • 2 and 4 are the tuning condensers
  • 5 is a self induction for protecting the secondary frequency
  • 6 is a frequency transformer
  • 7 and 8 are tuning elements for the secondary frequency
  • 9 the desired coupling with the antenna.
  • an alternating current generator a fre quency transformer, a primary circuit connected between the generator .and the transformer, a wave radiator, a secondary circuit connected between the transformer and the wave radiator, a choking coil in the primary circuit with a resistance for the secondary frequency at least twice that of the wave radiator, a capacity in the primary circuit for tuning the same to the fundamental frequency, and a capacity in the secondary circuit for tuning the same to any desired frequency in the wave radiator.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Coils Or Transformers For Communication (AREA)

Description

June 8 1926. 1,587,512
w. DORNIG HIGH FREQUENCY TR NSFORMER Filed Dec. 2, 1921 WALT ER D'ORN\G- By m5 A'H'ORNLY.
Patented June 8, 1926.
UNITED STATES PATENT OFFICE.
WALTER DORNIG, OF BERLIN-STEGLITZ, GERMANY.
HIGH-FREQUENCY TRANSFORMER.
Application filed December 2, 1921, Serial No. 519,325, and in Germany December 13, 1920.
The invention relates to high frequency transformers such as used for wireless telegwell known, two separated iron cores or paths for the lines of force are necessary on which, when there are continuous current windings and secondary windings wound in the same direction, the primary currents are connected in the opposite direction. Consequently the ensuing secondary voltage of doubled frequency will not react on the primary circuit, only the difference between the two cores being effective.
By the adoption of any other principle of frequency multiplication by transformers, with or without continuous current magnetization, the direction of winding of the primary and of secondary is the same, so also the voltage of the secondary frequency corresponding to the transformation ratio of the transformer obtains on the primary terminals and permits a current to flow through the primary circuit in accordance with the resistance. It is preferred, however, for different reasons, for example, in order to obtain as flat a resonance curve as possible and a low voltage or to avoid the cost of induction coils, to use in the individual resonance circuits as high capacities as possible without self induction coils, except possibly, only a small variometcr in order to bridge over the condenser unit. This causes very nearly a short circuit for the voltage of the secondary frequency under circumstances opposed to the resistance of the working circuit or, at least, a parallel connected circuit of few ohms. This is the cause of the bad efliciency of frequency multiplying systems. It has heretofore been proposed to provide in the primary circuit a so-called frequency trap to prevent a reaction of the secondary frequency on the primary circuit. This method is, however, objectionable since then whenever the secondary frequency is changed, the frequency trap must also be tuned to the new frequency. This is very disadvantageous, especially for a sender which has to send out waves of different frequency, as with each new wave the frequency trap then must be adjusted afresh.
According to the present invention choking coils are connected in the primary circuit which coils may be used also for tuning but they are of such size that the 1mpedanee of the primary circuit to the voltage of higher frequency amounts to a resistance which in relation to the working circuit is at least double.
By these means it is possible to design the choking coil so that it gives a highly protecting resistance for all secondary frequencies in question, and so that even if the secondary frequency is changed the primary circuit remains constant for all wave lengths.
The drawing shows by way of example an electrical diagram of the system according to the invention.
In the drawings, 1 is the oscillation producer, 2 and 4 are the tuning condensers, 5 is a self induction for protecting the secondary frequency, 6 is a frequency transformer, 7 and 8 are tuning elements for the secondary frequency, 9 the desired coupling with the antenna.
What I do claim as my invention and desire to secure by Letters Patent of the United States is 1 In an arrangement of the kind described, an alternating current generator, a fre quency transformer, a primary circuit connected between the generator .and the transformer, a wave radiator, a secondary circuit connected between the transformer and the wave radiator, a choking coil in the primary circuit with a resistance for the secondary frequency at least twice that of the wave radiator, a capacity in the primary circuit for tuning the same to the fundamental frequency, and a capacity in the secondary circuit for tuning the same to any desired frequency in the wave radiator.
In testimony whereof I afiix my signature.
WALTER DORNIG. [L- s]
US519325A 1920-12-13 1921-12-02 High-frequency transformer Expired - Lifetime US1587512A (en)

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DE1587512X 1920-12-13

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3044016A (en) * 1958-06-23 1962-07-10 Motorola Inc Remote control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3044016A (en) * 1958-06-23 1962-07-10 Motorola Inc Remote control system

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