GB633311A - Improvements in or relating to high-frequency electric furnaces - Google Patents

Improvements in or relating to high-frequency electric furnaces

Info

Publication number
GB633311A
GB633311A GB5306/48A GB530648A GB633311A GB 633311 A GB633311 A GB 633311A GB 5306/48 A GB5306/48 A GB 5306/48A GB 530648 A GB530648 A GB 530648A GB 633311 A GB633311 A GB 633311A
Authority
GB
United Kingdom
Prior art keywords
coil
relating
feb
frequency electric
induction heating
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
Application number
GB5306/48A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Philips Electronics NV
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 Philips Gloeilampenfabrieken NV, Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB633311A publication Critical patent/GB633311A/en
Expired legal-status Critical Current

Links

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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/04—Sources of current

Abstract

633,311. Induction heating. PHILIPS ELECTRICAL, Ltd. Feb. 23, 1948, No. 5306. Convention date, Feb. 26, 1947. [Class 39 (iii)] In order to stabilize the frequency and avoid parasitic oscillations in a valve oscillator circuit employed in H.F. induction heating apparatus, the frequency determining coil 3 is provided with an auxiliary coil 9 to step up the impedance of the anode circuit in known manner. The frequency determining coil 3 is divided longitudinally by a metallic screen 11, as shown in Fig. 2, so as to substantially de-couple magnetically, the reaction coil 4 and the auxiliary coil 9 which are placed on opposite sides of the screen 11 as shown in Fig. 2.
GB5306/48A 1947-02-26 1948-02-23 Improvements in or relating to high-frequency electric furnaces Expired GB633311A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL2554087X 1947-02-26
NL633311X 1947-02-26
NL808731X 1947-02-26

Publications (1)

Publication Number Publication Date
GB633311A true GB633311A (en) 1949-12-12

Family

ID=27351304

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5306/48A Expired GB633311A (en) 1947-02-26 1948-02-23 Improvements in or relating to high-frequency electric furnaces

Country Status (2)

Country Link
US (1) US2554087A (en)
GB (1) GB633311A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL96194C (en) * 1952-12-17
US2977548A (en) * 1958-04-10 1961-03-28 Tno Oscillator circuit with parasitic oscillation prevention means
GB1042536A (en) * 1963-02-13 1966-09-14 Sakuji Yamaguchi Method of coupling high frequency electric circuit
US3733454A (en) * 1972-02-17 1973-05-15 Olin Corp Oscillator tube filament circuit for high frequency welding generator
NL8901806A (en) * 1989-07-13 1991-02-01 Philips Nv POWER GENERATOR FOR DELIVERING HIGH-FREQUENCY HIGH VOLTAGE.

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2234184A (en) * 1938-06-14 1941-03-11 Bristel Company Electronic control system
US2248787A (en) * 1938-11-09 1941-07-08 Lorenz C Ag High frequency apparatus
NL58996C (en) * 1939-09-14
US2381057A (en) * 1942-11-05 1945-08-07 Westinghouse Electric Corp Oscillator circuit for inductive heating
US2416172A (en) * 1943-04-27 1947-02-18 Westinghouse Electric Corp High-frequency induction heating system
US2429819A (en) * 1944-03-28 1947-10-28 Gen Electric High-frequency heating apparatus
US2420744A (en) * 1944-05-04 1947-05-20 Rca Corp High-frequency oscillator of the secondary electron-emission type
US2420857A (en) * 1944-12-09 1947-05-20 Gen Electric Electric discharge device oscillator with nonlinear grid leak resistor

Also Published As

Publication number Publication date
US2554087A (en) 1951-05-22

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