GB1413219A - Induction heating apparatus with protective circuit arrangement - Google Patents

Induction heating apparatus with protective circuit arrangement

Info

Publication number
GB1413219A
GB1413219A GB5256973A GB5256973A GB1413219A GB 1413219 A GB1413219 A GB 1413219A GB 5256973 A GB5256973 A GB 5256973A GB 5256973 A GB5256973 A GB 5256973A GB 1413219 A GB1413219 A GB 1413219A
Authority
GB
United Kingdom
Prior art keywords
circuit
inverter
thyristor
nov
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
GB5256973A
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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
Priority claimed from JP11499072A external-priority patent/JPS5443689B2/ja
Priority claimed from JP47115378A external-priority patent/JPS4972749A/ja
Priority claimed from JP11580972A external-priority patent/JPS5513231B2/ja
Priority claimed from JP11692372A external-priority patent/JPS5523026B2/ja
Priority claimed from JP48090404A external-priority patent/JPS5038025A/ja
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of GB1413219A publication Critical patent/GB1413219A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/443—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M5/45—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/505—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/515—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/523—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with LC-resonance circuit in the main circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/505—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/515—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/525—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with automatic control of output waveform or frequency
    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/683—Plates having their feeding circuit closed as the kettles, pans or the like are put on

Abstract

1413219 Inverting circuits for inductively heated devices MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 13 Nov 1973 [15 Nov 1972 16 Nov 1972 17 Nov 1972 20 Nov 1972 10 Aug 1973] 52569/73 Headings H2H and H2F An induction heating device such as a cooking apparatus comprises an inverter fed from an A.C. source by way of a full wave rectifier, the heating device being energized by the output from the inverter, the inverter including a gatecontrolled semi-conductor device and being provided with protective devices to prevent damage which would occur to heavy current surges at switch on and overload currents. An electric cooker comprises an induction heating coil 12 energized by an inverter having an inductor 11 and a capacitor 10 forming a circuit which is set into resonance by the firing of a thyristor 7 paralleled by an oppositely poled diode 8, the inverter being supplied from an A.C. source 1 with unfiltered unidirectional current by way of a full wave rectifier 2. A circuit 14 is provided for supplying firing pulses to the thyristor 7, heavy current surges when the thyristor is rendered conductive being prevented by making the circuit 14 responsive to a start up circuit 15. The circuit 15 comprises means for sensing the voltage zero at the beginning of a half wave of the full wave rectified voltage from the rectifier 2. Having sensed a voltage zero the circuit 15 completes a circuit whereupon the capacitor 10 in the inverter circuit is completely discharged and thereafter, when the voltage at the output of the rectifier 2 has again risen to a value sufficiently for the inverter to begin oscillation, enables the circuit 14 to produce gating signals for the thyristor 7 which then becomes conductive to cause operation of the inverter to energize the induction heating coil 12. The apparatus is provided with a circuit 16 for detecting abnormal load conditions which would occur if, for example, a non-magnetic material were used as the load on the heating coil 12. In this case the frequency of oscillation of the inverter would be outside the limits set for the inverter oscillation and the circuit 16 would function to cause continuous conduction of the thyristor 7 causing an overload current to flow which would trip a switch S in the supply from the A.C. source 1.
GB5256973A 1972-11-15 1973-11-13 Induction heating apparatus with protective circuit arrangement Expired GB1413219A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP11499072A JPS5443689B2 (en) 1972-11-15 1972-11-15
JP47115378A JPS4972749A (en) 1972-11-16 1972-11-16
JP11580972A JPS5513231B2 (en) 1972-11-17 1972-11-17
JP11692372A JPS5523026B2 (en) 1972-11-20 1972-11-20
JP48090404A JPS5038025A (en) 1973-08-10 1973-08-10

Publications (1)

Publication Number Publication Date
GB1413219A true GB1413219A (en) 1975-11-12

Family

ID=27525478

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5256973A Expired GB1413219A (en) 1972-11-15 1973-11-13 Induction heating apparatus with protective circuit arrangement

Country Status (7)

Country Link
AU (1) AU467590B2 (en)
CA (1) CA998743A (en)
DE (1) DE2357155B2 (en)
FR (1) FR2206645B1 (en)
GB (1) GB1413219A (en)
IT (1) IT996456B (en)
NL (1) NL159545B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2199454A (en) * 1986-11-29 1988-07-06 Toshiba Kk Induction heated cooking apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2275959A1 (en) * 1974-06-21 1976-01-16 Cunningham Ronald Electronically controlled induction heater - has tuned parallel-resonant cct with tuned series-resonant cct with load coil

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2199454A (en) * 1986-11-29 1988-07-06 Toshiba Kk Induction heated cooking apparatus
US4820891A (en) * 1986-11-29 1989-04-11 Kabushiki Kaisha Toshiba Induction heated cooking apparatus
GB2199454B (en) * 1986-11-29 1990-10-03 Toshiba Kk Induction heated cooking apparatus

Also Published As

Publication number Publication date
AU467590B2 (en) 1975-12-04
NL159545B (en) 1979-02-15
DE2357155B2 (en) 1978-02-23
CA998743A (en) 1976-10-19
AU6254173A (en) 1975-05-15
DE2357155A1 (en) 1974-05-22
FR2206645A1 (en) 1974-06-07
FR2206645B1 (en) 1976-05-07
IT996456B (en) 1975-12-10
DE2357155C3 (en) 1978-10-05
NL7315538A (en) 1974-05-17

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee