US2117752A - Harmonic producer - Google Patents

Harmonic producer Download PDF

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Publication number
US2117752A
US2117752A US77989A US7798936A US2117752A US 2117752 A US2117752 A US 2117752A US 77989 A US77989 A US 77989A US 7798936 A US7798936 A US 7798936A US 2117752 A US2117752 A US 2117752A
Authority
US
United States
Prior art keywords
inductance
circuit
coil
output circuit
core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US77989A
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English (en)
Inventor
Lelshman R Wrathall
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US77989A priority Critical patent/US2117752A/en
Priority to FR821372D priority patent/FR821372A/fr
Priority to CH204388D priority patent/CH204388A/de
Priority to DEW3477D priority patent/DE886927C/de
Priority to GB12831/37A priority patent/GB477875A/en
Application granted granted Critical
Publication of US2117752A publication Critical patent/US2117752A/en
Priority to GB22220/38A priority patent/GB516844A/en
Priority to FR49760D priority patent/FR49760E/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/06—Arrangements for supplying the carrier waves ; Arrangements for supplying synchronisation signals
    • 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
    • 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
    • H03B19/16—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source using uncontrolled rectifying devices, e.g. rectifying diodes or Schottky diodes

Definitions

  • This invention relates to a generation of alternating current waves, and more particularly to a circuit arrangement for producing a group of harmonic frequencies having a uniformly large amplitude.
  • the object is attained by employing a particular circuit arrangement in combination with a magnetic-core 3o coil of the unpolarized type.
  • a fundamental frequency wave impressed on the coil connected in a resonant circuit produces a desired group of odd harmonic frequency waves.
  • An output circuit for the coil 35 includes a condenser connected in series with a load which may be a highly resistive impedance such as a bank of filters. The constants of the output circuit effects in the odd harmonics a uniformly large amplitude distributed over the 4 desired frequency range.
  • An additional feature of the invention is a use of a copper-oxide bridge rectifier connected across the output circuit to separate a desired group of even harmonic frequency waves having 45 a uniformly large amplitude distributed over the desired frequency range.
  • Fig. 1 is a diagrammatic circuit illustrating the preferred embodiment of the invention
  • Fig. 2 is a diagrammatic circuit delineating a 0 modification of Fig. l;
  • an alternating current source l0 generates a fundamental frequency wave, preferably 4 kilocycles, which is impressed on a primary circuit i l comprising in series an inductance Li, a condenser C1, and a non-linear inductance L.
  • the primary circuit II is resonant, or nearly so, to the fundamental frequency wave so that the latter is caused to follow a substantially sine wave form.
  • the inductance L embodying a non-linear magnetic core of a suitable structure such, for example, as the laminated or spiralled tape type produces a desired group of odd harmonics of the fundamental frequency in a well-known manner.
  • the inductance L is preferably formed with a comparatively small diameter so as to provide high magnetizing forces in response to relatively small magnetizing currents thereby enabling an operation within its saturation region.
  • the primary circuit II is designed to obviate reactance to the fundamental frequency and, in addition, to provide a high impedance to the desired range of odd harmonic frequencies.
  • the inductance of L1 is large as compared with that of L.
  • a secondary, or output circuit [4 comprises a highly resistive impedance load R and condenser C, both of which are connected in series with the inductance L.
  • I1 represents the sinusoidal current flowing at any instant from the alternating source 10 through the primary circuit ii; I: represents the current flowing at any instant in the inductance L; and Ia represents the current flowing at any instant through the output circuit I 4.
  • the B-H relationship of the coil is shown in Fig. 4.
  • the current I2 is seen in the broken curve of Fig. 3. As I: decreases below the negative saturation value (--)I-Is,
  • the inductance L possesses a relatively small impedance so that the I3 pulse is limited largely by the impedance of the load R.
  • the discharge current rises sharply to its maximum value and then drops sharply toward its minimum value and thereafter decreases in a substantially exponential manner until the charge on condenser C is entirely dissipated.
  • the current In is again substantially equal to the current I1 as seen in Fig. 3. The above action is then repeated in the opposite direction during which I1 attains values whereby the inductance L is caused to.
  • the sharp pulse of Is resulting from the discharge of the condenser 0 effects a uniformly large amplitude in the desired group of odd harmonies produced, as hereinbefore described, in the load R.
  • the form of the I3 curve is determined by the values of the impedance R and the condenser C of the output circuit, and also by the relatively small inductance of L during the discharge interval of the condenser C. These values may be preselected to provide a desired performance or constant, of the circuit.
  • the non-linear inductance L may also be considered as having two distinct values of inductance, one for each of the two stages of Is extending from M1 to 1r+pt1 in Fig. '7.
  • one of the inductances is relatively smaller than the other. Therefore, the smaller value of inductance must be so small that the fundamental potential impressed thereacross would be negligibly small to account for the absence of an appreciable steady-state fundamental current during this time.
  • the dincharge of condenser C must be sharply effected to account for the negligible portion of I: flowing during this interval.
  • the larger value Lo would seem to be associated with the initial permeability of the magnetic core of the inductance L while the value Ls would seem to be associated with the saturation permeability of the magnetic core.
  • Fig. 2 is a modification of the circuit shown in monics both of which may be used for cable car' rier and coaxial channel terminals.
  • the output circuit of Fig. 2 is connected to the primary winding of a transformer 34 having its secondary winding connected to a bank of filters 35 comprising six in number (by way of example) and arranged for parallel operation to pass only the desired group of odd harmonics.
  • a copper-oxide bridge rectifier 36 comprising one pair of the conjugate bridge terminals connected across the secondary circuit 30 and a second pair of output bridge terminals connected to the primary winding of a transformer 31.
  • the secondary winding of the latter is connected to a bank of filters 38 comprising six in number and arranged for parallel operation to pass only the desired groups of even harmonic frequencies.
  • the arms of the rectifying bridge are so poled that alternate pulses of I; are reversed thereby causing current to always flow in the same direction through the primary winding of the transformer 31.
  • only the even harmonics are provided with a uniformly large amplitude distributed over a desired frequency range.
  • a harmonic producing system comprising an induction coil having a saturable magnetic core, means for impressing sufficient alternating current energy of a base frequency on the coil to cause saturation of its core so as to produce odd harmonics of the base frequency in the coil, and an output circuit for the coil including means for making certain that the produced harmonics will have a uniformly large amplitude over a desired frequency range, the means in the output circuit comprising a capacity and resistance in series with the induction coil, said resistance being sufficiently high to render said output circuit non-oscillatory within the range of utilized harmonics.
  • a harmonic producing circuit comprising a the first-mentioned coil comprising a capacity and a load in series therewith, the values of the second-mentioned capacity, the effective resistance of the load, and the smallest inductance of the first-mentioned coil being so chosen as to make the output circuit substantially aperiodic whereby harmonics are produced within a desired frequency range of a uniformly large amplitude; and means associated with the output circuit for selecting certain of the harmonics within the desired frequency range.
  • an induction coil having a saturable magnetic core
  • an output circuit for the coil comprising a capacity in series with a highly resistive impedance; the values of the capacity, the impedance, and the smallest inductance of the induction coil being selected to confine the condenser discharge current principally to a single short sharp impulse in each half cycle of the fundamental wave to effect a uniformly large amplitude in the generated odd harmonics distributed over the desired frequency range; means connected across the output circuit for selecting certain of the odd harmonics in the desired frequency range, a copper-oxide rectifier bridge connected across the output circuit for rectifying a portion of the odd harmonic energy, and a circuit connected across the conjugate points of the bridge for taking off even harmonics of the fundamental frequency, said copper oxide rectifier comprising a part of the highly resistive impedance of the output circuit.
  • an alternating current generator an induction coil having a saturable magnetic core, a circuit coupling the generator across the coil and including an air-core induction coil and a capacity in series therewith, the circuit being tuned to the fundamental frequency of the generator for producing odd harmonics of the fundamental frequency in the magnetic-core coil, the inductance of the aircore coil being relatively large as compared with the inductance of the magnetic-core coil, a loar. circuit including a capacity connected across the magnetic-core coil; the value of the last-mentioned capacity, the effective resistance of th.
  • the load circuit and the smallest inductance of the magnetic-core coil being selected to confine the condenser discharge current principally to a single short sharp impulse in each half cycle of the fundamental wave to effect over the desired frequency range a uniformly large amplitude in the produced odd harmonics; means connected across the load circuit for selecting certain of the odd harmonics within the desired frequency range, a copper-oxide rectifier bridge connected across the output circuit for rectifying a portion of the odd harmonic energy, and a circuit con-' nected across the conjugate points of the bridge for taking off even harmonics of the fundamental frequency, said copper oxide rectifier comprising a part of the highly resistive impedance of the output circuit.
  • a saturable core inductance an exciting circuit producing substantially sinusoidal current flow through said inductance of sufficient amplitude to produce saturation in said core, and an output circuit including in series a winding on said core and a condenser and a highly resistive load, said output circuit containing sufficient resistance to render it substantially aperiodic whereby a broad range of harmonic frequency currents are produced in said load.
  • a harmonic frequency producing system comprising a saturable core inductance, a circuit for applying base frequency current thereto of sufiicient amplitude to saturate said core, an output circuit connected across a winding on said core and including a condenser and a highly resistive load in series, the time constant of said output circuit being proportioned to permit said condenser to become substantially fully charged during the portion of the cycle throughout which said inductance has its maximum value and to discharge through said load when said inductance has substantially its minimum value, the resistance of said output circuit being so high as to render the output circuit highly damped.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Inverter Devices (AREA)
  • Rectifiers (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Power Conversion In General (AREA)
US77989A 1936-05-05 1936-05-05 Harmonic producer Expired - Lifetime US2117752A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US77989A US2117752A (en) 1936-05-05 1936-05-05 Harmonic producer
FR821372D FR821372A (fr) 1936-05-05 1937-05-03 Appareils générateurs d'ondes électriques à fréquences harmoniques
CH204388D CH204388A (de) 1936-05-05 1937-05-04 Schaltungsanordnung zur Erzeugung harmonischer Frequenzen aus einer Grundfrequenz.
DEW3477D DE886927C (de) 1936-05-05 1937-05-05 Anordnung zur Erzeugung von harmonischen Frequenzen
GB12831/37A GB477875A (en) 1936-05-05 1937-05-05 Apparatus for producing harmonic frequency electrical waves from a base frequency
GB22220/38A GB516844A (en) 1936-05-05 1938-07-26 Apparatus for producing harmonic frequency electrical waves from a base frequency
FR49760D FR49760E (fr) 1936-05-05 1938-07-29 Appareils générateurs d'ondes électriques à fréquences harmoniques

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US77989A US2117752A (en) 1936-05-05 1936-05-05 Harmonic producer
GB22220/38A GB516844A (en) 1936-05-05 1938-07-26 Apparatus for producing harmonic frequency electrical waves from a base frequency

Publications (1)

Publication Number Publication Date
US2117752A true US2117752A (en) 1938-05-17

Family

ID=10175864

Family Applications (1)

Application Number Title Priority Date Filing Date
US77989A Expired - Lifetime US2117752A (en) 1936-05-05 1936-05-05 Harmonic producer

Country Status (5)

Country Link
US (1) US2117752A (de)
CH (1) CH204388A (de)
DE (1) DE886927C (de)
FR (2) FR821372A (de)
GB (2) GB477875A (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2420213A (en) * 1944-07-11 1947-05-06 Union Switch & Signal Co Apparatus for frequency multiplication of alternating electric currents
US2438888A (en) * 1943-12-06 1948-04-06 Bell Telephone Labor Inc Radio object detector training device
US2530614A (en) * 1943-10-21 1950-11-21 Hartford Nat Bank & Trust Co Transmitter and receiver for single-sideband signals
US2772594A (en) * 1952-03-28 1956-12-04 Maas Rowe Electromusic Corp Apparatus for producing chime tones
US2776373A (en) * 1953-12-14 1957-01-01 Bell Telephone Labor Inc Frequency conversion circuits
US2981921A (en) * 1958-11-03 1961-04-25 Arcoa Inc Connector for connecting a branch wire to a current conducting through wire
US3008081A (en) * 1956-07-28 1961-11-07 Philips Corp Frequency-transformation device comprising at least one non-linear element
US3133259A (en) * 1960-08-26 1964-05-12 Bell Telephone Labor Inc Harmonic selective filter
US3206535A (en) * 1960-05-07 1965-09-14 Nihon Gakki Seizo Kabushiki Ka Attenuating sound control system for electronic musical instruments
US4259156A (en) * 1977-02-07 1981-03-31 Kraftwerk Union Aktiengesellschaft Device for coupling pipelines in reactor pressure vessels, preferably the pipelines of the feedwater manifold
US4504897A (en) * 1983-11-15 1985-03-12 White Scientific Consultants Inc. Harmonic noise control in chopper type voltage regulators
US5013974A (en) * 1987-08-24 1991-05-07 Nilssen Ole K Electronic ballast with improved lamp current crest factor

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE460578A (de) * 1944-10-27
US2828420A (en) * 1956-06-18 1958-03-25 Joseph J Suozzi Magnetic tripler power factor correction
DE1062764B (de) * 1957-06-19 1959-08-06 Telefunken Gmbh Anordnung zur Erzeugung harmonischer Frequenzen mit Eisensaettigung

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2530614A (en) * 1943-10-21 1950-11-21 Hartford Nat Bank & Trust Co Transmitter and receiver for single-sideband signals
US2438888A (en) * 1943-12-06 1948-04-06 Bell Telephone Labor Inc Radio object detector training device
US2420213A (en) * 1944-07-11 1947-05-06 Union Switch & Signal Co Apparatus for frequency multiplication of alternating electric currents
US2772594A (en) * 1952-03-28 1956-12-04 Maas Rowe Electromusic Corp Apparatus for producing chime tones
US2776373A (en) * 1953-12-14 1957-01-01 Bell Telephone Labor Inc Frequency conversion circuits
US3008081A (en) * 1956-07-28 1961-11-07 Philips Corp Frequency-transformation device comprising at least one non-linear element
US2981921A (en) * 1958-11-03 1961-04-25 Arcoa Inc Connector for connecting a branch wire to a current conducting through wire
US3206535A (en) * 1960-05-07 1965-09-14 Nihon Gakki Seizo Kabushiki Ka Attenuating sound control system for electronic musical instruments
US3133259A (en) * 1960-08-26 1964-05-12 Bell Telephone Labor Inc Harmonic selective filter
US4259156A (en) * 1977-02-07 1981-03-31 Kraftwerk Union Aktiengesellschaft Device for coupling pipelines in reactor pressure vessels, preferably the pipelines of the feedwater manifold
US4504897A (en) * 1983-11-15 1985-03-12 White Scientific Consultants Inc. Harmonic noise control in chopper type voltage regulators
US5013974A (en) * 1987-08-24 1991-05-07 Nilssen Ole K Electronic ballast with improved lamp current crest factor

Also Published As

Publication number Publication date
GB477875A (en) 1938-01-07
GB516844A (en) 1940-01-12
CH204388A (de) 1939-04-30
FR821372A (fr) 1937-12-03
DE886927C (de) 1953-08-20
FR49760E (fr) 1939-07-13

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