GB199894A – Improvements in the generation of alternating currents by thermionic devices
– Google Patents
GB199894A – Improvements in the generation of alternating currents by thermionic devices
– Google Patents
Improvements in the generation of alternating currents by thermionic devices
Info
Publication number
GB199894A
GB199894A
GB1338222A
GB1338222A
GB199894A
GB 199894 A
GB199894 A
GB 199894A
GB 1338222 A
GB1338222 A
GB 1338222A
GB 1338222 A
GB1338222 A
GB 1338222A
GB 199894 A
GB199894 A
GB 199894A
Authority
GB
United Kingdom
Prior art keywords
grid
coil
harmonics
circuits
circuit
Prior art date
1922-05-12
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
Application number
GB1338222A
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.)
Individual
Original Assignee
Individual
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.)
1922-05-12
Filing date
1922-05-12
Publication date
1923-07-05
1922-05-12
Application filed by Individual
filed
Critical
Individual
1922-05-12
Priority to GB1338222A
priority
Critical
patent/GB199894A/en
1923-07-05
Publication of GB199894A
publication
Critical
patent/GB199894A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
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Classifications
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
H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
H03B5/10—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being vacuum tube
Abstract
199,894. Robinson, E. Y. May 12, 1922. Thermionic generators; coupling oscillating and radiating circuits.-The wave-form of the output current of a thermionic generator is given a predetermined form, usually sinusoidal, by modifying the wave-form of the input voltage so as to compensate for the distortion introduced by the curvature of the characteristic. The input voltage may be supplied by an independent source or by reactive coupling. Fig. 1 shows a sinusoidal output wave 3 produced by a distorted input wave 4 which varies the grid potential on either side of a working-point 2 situated near the middle of therising portion of the characteristic 1. When working with considerable negative potential on the grid, an input wave of the form 7 produces half-waves 6 of sine form separated by intervals of no current. The valve 9, Fig. 2, has its grid circuit 11 supplied by an independent source and is coupled to the tuned plate circuit 10 by a coil 12 connected for reverse retro-action. The barmonics produced in the plate circuit 10 owing to the bends of the characteristic are reduced to a minimum by the back coupling. In a modification the grid coupling coil 12 is replaced by a series of circuits tuned respectively to the various harmonics. A similar arrangement is shown in Fig. 4, in which the oscillations are generated by virtue of the back coupling between the plate oscillatory circuit 22 and the grid coil 23, and the harmonics are reduced by the reverse back coupling between the plate coil 27 and the grid circuits 25 tuned to various harmonics. The plurality of circuits 25 may be connected in the plate circuit, and the coil 27 in the grid circuit. The circuits 25 may be replaced by a single coil having large distributed capacity in order that it may resonate to the harmonics. The valve grid is given a normal negative potential by a leaky condenser 28, so that the valve only passes half waves of current. In the valve circuit shown in Fig. 5, the usual back coupling 29, 30 is provided for the generation of oscillations, and an auxiliary back coupling comprising amplifying valves with aperiodic circuits and interconnecting transformers is provided for the damping of harmonics. At each transformer the induced voltage is proportional to the rate of change of the primary current, so that harmonics are emphasised relatively to the fundamental oscillation. The number of transformers used should be odd, or the number of valves even, so that the voltages induced in the grid coil 35 may be in correct phase to produce a damping effect. This effect is much greater for the harmonics than for the fundamental.
GB1338222A
1922-05-12
1922-05-12
Improvements in the generation of alternating currents by thermionic devices
Expired
GB199894A
(en)
Priority Applications (1)
Application Number
Priority Date
Filing Date
Title
GB1338222A
GB199894A
(en)
1922-05-12
1922-05-12
Improvements in the generation of alternating currents by thermionic devices
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB1338222A
GB199894A
(en)
1922-05-12
1922-05-12
Improvements in the generation of alternating currents by thermionic devices
Publications (1)
Publication Number
Publication Date
GB199894A
true
GB199894A
(en)
1923-07-05
Family
ID=10021928
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1338222A
Expired
GB199894A
(en)
1922-05-12
1922-05-12
Improvements in the generation of alternating currents by thermionic devices
Country Status (1)
Country
Link
GB
(1)
GB199894A
(en)
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US2852681A
(en)
*
1947-07-09
1958-09-16
Moore And Hall
Setting of circuits for high frequency, high efficiency oscillators
US3188442A
(en)
*
1962-08-28
1965-06-08
Chemetron Corp
High frequency heating system
1922
1922-05-12
GB
GB1338222A
patent/GB199894A/en
not_active
Expired
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US2852681A
(en)
*
1947-07-09
1958-09-16
Moore And Hall
Setting of circuits for high frequency, high efficiency oscillators
US3188442A
(en)
*
1962-08-28
1965-06-08
Chemetron Corp
High frequency heating system
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