DE2264432A1 - DEVICE AND CIRCUIT FOR CONTACTLESS HEATING OF AN ELECTRICALLY CONDUCTIVE OBJECT, IN PARTICULAR BY INDUCTIVE WAYS, AS WELL AS AUXILIARY CIRCUITS AND CONTROL AND REGULATING CIRCUITS FOR DETECTION OR. CHANGE OF THE APPLICABLE PARAMETERS - Google Patents

DEVICE AND CIRCUIT FOR CONTACTLESS HEATING OF AN ELECTRICALLY CONDUCTIVE OBJECT, IN PARTICULAR BY INDUCTIVE WAYS, AS WELL AS AUXILIARY CIRCUITS AND CONTROL AND REGULATING CIRCUITS FOR DETECTION OR. CHANGE OF THE APPLICABLE PARAMETERS

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Publication number
DE2264432A1
DE2264432A1 DE2264432*A DE2264432A DE2264432A1 DE 2264432 A1 DE2264432 A1 DE 2264432A1 DE 2264432 A DE2264432 A DE 2264432A DE 2264432 A1 DE2264432 A1 DE 2264432A1
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Prior art keywords
amplifier
voltage
circuit
temperature
output
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DE2264432*A
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German (de)
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Philip H Peters
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Environment One Corp
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Environment One Corp
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Priority to DE2264432*A priority Critical patent/DE2264432A1/en
Publication of DE2264432A1 publication Critical patent/DE2264432A1/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/02—Stoves or ranges heated by electric energy using microwaves
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1917—Control of temperature characterised by the use of electric means using digital means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/27—Control of temperature characterised by the use of electric means with sensing element responsive to radiation
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/125—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/135—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Temperature (AREA)

Claims (1)

P a t e n t a n s p r ü c h e 1. Antastschaltung für einen Zerhacker mit Thyristor, gekennzeichnet durch eine Stromversorgung (15, 16), einen davon gespeisten Gleichspannungsgenerator (9 einen Rampensigneignenerator (34,94) und einen bei einer bestimmten Rampenspannung ansprechenden Detektor (95), der bei Erreichen der vorherbestimmten Rampenspannung leitend wird und dadurch einen Halbleiterschalter (97) mit relativ flacher Strom/Spannungs-Kennlinie anschaltet, dessen geschaltete Elektroden das Erregersignal für die Steuerung des Thyristors (17) führen. 2. Antastschaltung nach Anspruch 1, dadurch gekennzeichnet, da3 die Emitter-Kollektorstrecke des Halbleiter-Schalters (97) in Reihe mit einem weiteren Signalge nerator (98,99) an der Hochspannungs-Gleichstromversorgung liegt, und daß die Basis dieses Transistors (57) von dem bei einem bestimmten Wert der Rampenspannung leitend werden den Detektor (95) angetastet ist. 5. Antastschaltllr. nach Anspruch 1 oder 2, dadurch gekennzeichnet, dal' der die Höhe der Rampenspannung erfassende Detektor ein Transistor mit einem Ubergang ist, der bei Anliegen eines bestimmten Potentials leitend wird (unijunetion transistor), und da.s die Ladezeit des Kondensators (94) im Rampensignalgene rator veränderbar (34) ist. 4. Antastschaltung nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß der bei einem bestimmten Wert der Rampenspannung leitend werdende Detektor ein Einseiten-Silicium-Schaltelement (SUS 95) ist, und daß die RC-Konstante des Ladekreises, in welchem die Rampenspannung erzeugt wird, veränderlich ist. 5. Antastschaltung nach Anspruch 4, dadurch gekennzeichnet, daß der weitere Signalgenerator, der mit der Emitter-Kollektorstrecke des Transistors (97) in Reihe liegt, ein lmpulstransformator ist, dessen Primärwicklung (98) mit der gesteuerten Strecke des Transistors an einer Glelchspannung liegt, und dessen Sekundärwicklung (99) ggfs. über weitere VerstKrierkreise und ggfs. unter ZufUgung von Glättungskreisen das Antastsignal für den Hochleistungsthyristor (17) liefert (Fig. 4). 6. Schaltung zur Regelung einer eingestellten Temperatur für einen Zerhacker insbesondere nach den vorstehenden Ansprtlchen, gekennzeichnet durch einen von der geregelten Temperatur beaufschlagten Temperaturwandler (54), einen Konstantstromverstärker (121) in Reihe mit dem Wandler und einer Gleichspannungsversorgung, einer Einrichtung (42) zur periodischen Unterbrechung des Lichtpfades zwischen dem die geregelte Temperatur aufweisenden Ort und dem Wandler (54), so daß die elektrische Ausgangsgröße des Wandlers eine Wechselspannungskomponente aufweist, dessen Amplitude kennzeichnend für die gemessene Temperatur ist, einen Wechselstromverstärker (129), einen veränderlichen Widerstand (133) zur Einstellung der Solltemperatur, welcher die Verstärkung des Wechselstromverstärkers steuert, wobei die Einstellung des veränderlichen Widerstandes (133) dazu dient, einen Temperaturpegel zu bestimmen, bei welchem der Ausgang des Wechselstromverstärkers einen bestimmten Betriebspegel erreicht, einen bistabilen Schalter (138) am Ausgang des Wechselstromverstärkers zur Erzeugung eines verstärkten Ein/Aus-Ausgangssignales, welches der Isttemperatur entspricht, und Mitteln (135) zum Anlegen von Betriebsspannungspotentialen aus einem gemeinsamen Bezugspunkt (C) an die Quelle der den Wechselstrom-Verstärker versorgenden Niederspannung und den Ein/Aus-Verstärker, wodurch die Wirkungen von Veränderungen im Erregerpotential minimal gehalten werden. 7. Schaltung nach Anspruch 6, dadurch gekennzeichnet, daß der Konstantatromvers tärker einen Feldeffekttransistor (121) aufweist, der eine Saug-, eine Quell- und eine Steuerelektrode aufweist, und daß ein RUckkopplungswiderstand in Reihe zwischen der Saug- und der Quellelektrode liegt, daß der Widerstand ferner über einen Rückkopplungspfad an der Steuerelektrode des Feldeffekttransistors liegt, so daß ein konstanter Strom durch den Feldeffekttransistor und den damit in Reihe liegenden Widerstand fließt, und daß die Reihenschaltung bestehend aus dem Rückkopplungswiderstand und der Saug- sowie der Quellelektrode in Reihe mit dem Infrarot-Wandler (54) liegt. 8. Schaltung nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß der Wechselstromverstärker ein integrierter Betriebsverstärker ist, der einen umpolenden und einen nicht umpolenden Eingang hat, wobei das Ausgangssignal des Wandlers wechselspannungsrnäßig an den nicht umpolenden Eingang gelegt ist, daß der zur Temperatureinstellung veränderliche Widerstand insgesamt drei veränderliche Widerstände (131-133) aufweist, die in Reihe zwischen dem Ausgang und dem umpolenden Eingang des Verstärkers liegen, wobei die beiden äußeren veränderlichen Widerstände der Reihenschaltung aus den drei Widerständen zum Einstellen der minimalen und maximalen Temperaturen dient, und der mittlere veränderliche Widerstand zur Einstellung des Sollwertes der Temperatur dient, und daß sowohl der umpolende als auch der nicht umpolende Eingang des Betriebsverstärkers Betriebsvorspannungen von der Versorgungs-Quelle erhalten, die auch den Wandler und den Wechselstromverstärker versorgt. 9. Schaltung nach Anspruch 8, dadurch gekennzeichnet, daß der Ein/Aus-Verstärker einen bistabilen Triggerschaltkreis (138) aufweist, der vom Ausgang des Wechselstromverstärkers gesteuert wird, wobei der eine der bistabilen Zustände dann angeschaltet ist, wenn der Ausgang des Wechselstromverstärkers denjenigen Pegel erreicht, der der Solltemperatur entspricht, und automatisch in den ersten stabilen Zustand geht, wenn der Verstärker-Ausgang unter diesen dem Sollwert entsprechenden Pegel geht, und daß getrennte Wechselstromquellen für den bistabilen Schaltkreis, den Infrarotwandler und den Wechselstromyerstärker vorgesehen sind, um die gespeisten Bauteile des Kreises voneinander zu isolieren (Fig. 4A). 1o. Schaltung nach Anspruch 8, dadurch gekennzeichnet, daß der als Ein/Aus-Schalter wirkende Verstärker ein Relais mit Spule (161) aufweist, welche Spule mit dem Ausgang des Wechselstromverstärkers und einem Hochspannungsladenetzwerk (165) verbunden ist, welches Niederspannungs-Antastsignale an die Steuerelektrode eines Halbleiter-Schalters (72) legt, und da3 die von der Spule gesteuerten Kontakte (162) des Relais je nach Schalterstellung das Ladenetzwerk mit dem Ausgang des Wechselstromverstärkers laden oder entladen (Fig. 5). 11. Scnaltung zur Erfassung und Steuerung der Temperatur eines Kochgefäßes, welches auf einer wärmedurchlässigen Unterlage (49) steht, wobei ein Infrarotwandler (94) in Sichtverbindung mit dem Kochgefäß durch die Unterlage hindurch steht, um ein elektrisches Ausgangssignal zu erzeugen, welches direkt mit der Temperatur des Kochgefäßes in Beziehung steht. 12. Anordnung nach Anspruch 11, dadurch gekennzeichnet, daß die wärmedurchlässige Unterlage (49) aus einem elektrisch isolierenden Werkstoff. z.B. einem Pyrokeramischen Werkstoff, besteht. 13. Anordnung nach Anspruch 11, dadurch gekennzeichnet, da3 unter der wärmedurchlässigen Unterlage eine ebene Induktions-Heizspule in Form einer Spirale mit einer Mittelöffnung angeordnet ist, und zur Induktionsheizung des Kochgefäßes dient, und daß der Infrarotwandler (54) den Boden des Kochgefäßes durch diese Mittelöffnung (4d) hindurch sieht. 14. Anordnung nach Anspruch 11, 12 oder 13, kennzeichnet durch einen Unterbrecher im Lichtpfad zwischen dem Boden des Kochgefäßes und dem Wandler zur Erzeugung einer Wechselspannungskomponete im Wandler, deren Amplitude kennzeichnend für die Temperatur des Gefüßes ist. 15. Anordnung nach Anspruch 14, dadurch gekennzeichnet, da3 der Unterbrecner des Lichtpfades ein Propeller ist, der gleichzeltig zu Kühlzwecken der Anordnung ausgebildet ist (Fig. 3E). 16. Anordnung nach Anspruch 19, gekennzeichnet durch einen ringförmig ausgestalteten, nach oben offenen Trog (56) aus Ferrit mit einer Mittelöffnung (57), der in seiner ringförmigen Trogöffnung die Induktions-Heizspul (41) aufnimmt, wobei die Magnetlinien im wesentlichen zwischen dem Irulenrand und dem Au3enrand des ringförmigen Troges verlaufen (Fig. 5D). i7. Anordnung nach Anspruch 11, gekennzeichnet durch einen Wärmestrahlurlgs-Heflektor unterhalb des Wandlers, zur Vergrößerung der vom Wandler aufgenommenen Strahlung vom Kochgefäß. ib. Anordnung nach einem oder meiirervn der Ansprüche 11 bis 17, dadurch gekennzeichnet, da3 der Infrarotangler eine Bleisulfid-Halbleiterzelle ist.P atentansprü che 1. Probing circuit for a chopper with thyristor, characterized by a power supply (15, 16), a DC voltage generator fed by it (9, a ramp signal generator (34, 94) and a detector (95) which responds at a certain ramp voltage and which is at Reaching the predetermined ramp voltage becomes conductive and thereby turns on a semiconductor switch (97) with a relatively flat current / voltage characteristic, the switched electrodes of which carry the excitation signal for controlling the thyristor (17) Emitter-collector path of the semiconductor switch (97) in series with another Signalge generator (98.99) is connected to the high-voltage DC power supply, and that the base of this transistor (57) from which the detector is conductive at a certain value of the ramp voltage (95) is touched 5. Touch switch according to claim 1 or 2, characterized in that The detector which detects the level of the ramp voltage is a transistor with a transition which becomes conductive when a certain potential is applied (unijunetion transistor), and the charging time of the capacitor (94) in the ramp signal generator can be changed (34). 4. Probing circuit according to claim 1, 2 or 3, characterized in that the detector which becomes conductive at a certain value of the ramp voltage is a single-sided silicon switching element (SUS 95), and that the RC constant of the charging circuit in which the ramp voltage is generated, is mutable. 5. Probing circuit according to claim 4, characterized in that the further signal generator, which is in series with the emitter-collector path of the transistor (97), is a pulse transformer, the primary winding (98) of which is connected to an equilibrium voltage with the controlled path of the transistor, and the secondary winding (99) of which supplies the touch signal for the high-power thyristor (17) via further amplifying circuits and possibly with the addition of smoothing circuits (FIG. 4). 6. Circuit for regulating a set temperature for a chopper in particular according to the preceding claims, characterized by a temperature converter (54) acted upon by the regulated temperature, a constant current amplifier (121) in series with the converter and a DC voltage supply, a device (42) for periodic interruption of the light path between the location having the regulated temperature and the transducer (54), so that the electrical output variable of the transducer has an alternating voltage component, the amplitude of which is characteristic of the measured temperature, an alternating current amplifier (129), a variable resistor (133) for setting the target temperature which controls the gain of the AC amplifier, the setting of the variable resistor (133) being used to determine a temperature level at which the output of the AC amplifier reaches a certain operating level, a bistable switch (138) at the output of the AC amplifier for generating an amplified on / off output signal which corresponds to the actual temperature, and means (135) for applying operating voltage potentials from a common reference point (C) to the source of the low voltage supplying the AC amplifier and the on / off amplifier, thereby minimizing the effects of changes in the excitation potential. 7. A circuit according to claim 6, characterized in that the Konstantatromvers tärker has a field effect transistor (121) which has a suction, a source and a control electrode, and that a feedback resistor is in series between the suction and the source electrode, that the resistor is also connected via a feedback path to the control electrode of the field effect transistor, so that a constant current flows through the field effect transistor and the resistor in series, and that the series circuit consisting of the feedback resistor and the suction and source electrodes in series with the infrared Converter (54) is located. 8. A circuit according to claim 6 or 7, characterized in that the AC amplifier is an integrated operational amplifier which has a polarity reversal and a non-polarity reversal input, the output signal of the converter being applied to the non-polarity reversal input that the variable temperature setting resistor a total of three variable resistors (131-133), which are in series between the output and the polarity reversal input of the amplifier, the two outer variable resistors of the series connection of the three resistors are used to set the minimum and maximum temperatures, and the middle variable Resistance is used to set the setpoint of the temperature, and that both the polarity reversal and the non-polarity reversal input of the operational amplifier receive operating bias voltages from the supply source, which also supplies the converter and the AC amplifier. 9. A circuit according to claim 8, characterized in that the on / off amplifier has a bistable trigger circuit (138) which is controlled by the output of the AC amplifier, one of the bistable states being switched on when the output of the AC amplifier has that level reached, which corresponds to the setpoint temperature, and automatically goes into the first stable state when the amplifier output goes below this level corresponding to the setpoint, and that separate AC sources for the bistable circuit, the infrared converter and the AC amplifier are provided to the powered components of the circle from each other (Fig. 4A). 1o. Circuit according to Claim 8, characterized in that the amplifier acting as an on / off switch has a relay with a coil (161), which coil is connected to the output of the AC amplifier and a high-voltage charging network (165) which sends low-voltage probing signals to the control electrode of a semiconductor switch (72), and the contacts (162) of the relay controlled by the coil, depending on the switch position, charge or discharge the charging network with the output of the AC amplifier (FIG. 5). 11. Scnaltung for detecting and controlling the temperature of a cooking vessel, which is on a heat-permeable base (49), wherein an infrared converter (94) is in visual contact with the cooking vessel through the base to generate an electrical output signal which is directly connected to the Temperature of the cooking vessel is related. 12. The arrangement according to claim 11, characterized in that the heat-permeable base (49) consists of an electrically insulating material. e.g. a pyroceramic material. 13. The arrangement according to claim 11, characterized in that a flat induction heating coil in the form of a spiral with a central opening is arranged under the heat-permeable base, and is used for induction heating of the cooking vessel, and that the infrared converter (54) the bottom of the cooking vessel through this Central opening (4d) sees through. 14. Arrangement according to claim 11, 12 or 13, characterized by an interrupter in the light path between the bottom of the cooking vessel and the converter for generating an alternating voltage component in the converter, the amplitude of which is indicative of the temperature of the vessel. 15. Arrangement according to claim 14, characterized in that the interrupter of the light path is a propeller which is also designed for cooling purposes of the arrangement (Fig. 3E). 16. The arrangement according to claim 19, characterized by an annularly designed, upwardly open trough (56) made of ferrite with a central opening (57) which receives the induction heating coil (41) in its annular trough opening, the magnetic lines essentially between the Irulenrand and the outer edge of the annular trough run (Fig. 5D). i7. Arrangement according to Claim 11, characterized by a heat radiation deflector below the transducer, for increasing the radiation from the cooking vessel absorbed by the transducer. Ib. Arrangement according to one or more of Claims 11 to 17, characterized in that the infrared angler is a lead sulfide semiconductor cell. 1). Schaltung, insbesondere zur Speisung der Induktions-Helzspule, einer Induktions-Heizanordnung, gekennzeichnet durch einen netzgespeisten Gleichrichter (14) zur Erzeugung einer pulsierenden Gleichspannung, einen Hochfrequenz-Schwingkreis (17, 18, 19), der die in der pulsierenden Gleichspannung vorliegende Energie in gepulste Hochfrequenz umsetzt, und durch einen Leistungsschalter (21) in der Schaltung zwischen der Netzversorgung und dem Hochfrequenz-Generator, zur Steuerung der vom Hochrequenz-Generator abgegebenen Energie.1). Circuit, in particular for supplying the induction heating coil, an induction heating arrangement, characterized by a mains-fed rectifier (14) for generating a pulsating DC voltage, a high-frequency oscillating circuit (17, 18, 19), which converts the energy present in the pulsating DC voltage into converts pulsed high frequency, and through a power switch (21) in the circuit between the mains supply and the high-frequency generator, to control the vom High frequency generator emitted energy. 20. Schaltung nach Anspruch 19, gekennzeichnet durch ein Steuerglied (34) zur Veränderung der Frequenz des Hochfrequenz-'aenerators im Sinne einer Steuerung der von diesem Generator abgegebenen Energie.20. Circuit according to claim 19, characterized by a control member (34) to change the frequency of the high-frequency generator in the sense of a control the energy given off by this generator. 21. Anordnung nach Anspruch 19 oder 20, dadurch gekennzeichnet, daß der Hochfrequenz-Schwingkreis zumindest einen Kondensator als Schwingkreiskomponente enthält, dessen Kapazität zur Veränderung der abgegebenen Leistung veranderlich ist.21. Arrangement according to claim 19 or 20, characterized in that the high-frequency resonant circuit has at least one capacitor as a resonant circuit component contains, whose capacity to change the output is variable is. 22. Schaltung; nacn Anspruch 19, dadurch gekennzeichnet, das3 zwischen dem Gleichrichter-Ausgang und dem Eingang des Hochfrequenz-Generators ein steuerbarer Schalter (21) liegt, der von einem die Phasenlage -der Impulse der pulsierenden Gleichspannung erfassenden Signalgenerator im Sinne einer Veränderung der vom Hochfrequenz-Schwingkreis abgegebenen Energie gesteuert ist (Fig. lo).22. circuit; According to claim 19, characterized in that the 3 between the rectifier output and the input of the high-frequency generator a controllable Switch (21) is located by one of the phase position of the pulses of the pulsating Signal generator that detects direct voltage in the sense of a change in the high-frequency oscillating circuit delivered energy is controlled (Fig. Lo). g. Schaltung nach Anspruch I$, dadurch gekennzeichnet, daß zur Veränderung der vom Nochfrequenz-Schwingkreis abgegebenen Hochfrequenzenergie Cifl Schalter (207) zwischen der Netzversorgung und dem Gleichrichter liegt, und daß der Schalter im Bereich des Nulldurchgangs der Spannung steuerbar ist. G. Circuit according to Claim I $, characterized in that for changing the high-frequency energy Cifl switch emitted by the still-frequency resonant circuit (207) is between the mains supply and the rectifier, and that the switch is controllable in the area of the zero crossing of the voltage. 24. Schaltung nach Anspruch 19, dadurch gekennzeichnet, daß zur Veränderung der vom HF-Schwingkreis abgegebenen Energie zwischen der Netzversorgung und dem Gleich richter (201-204) -!n von der Phase der Netzspannung gesteuerter Schalter (2o':) liegt.24. A circuit according to claim 19, characterized in that the change the energy emitted by the HF resonant circuit between the mains supply and the Rectifier (201-204) -! N switch controlled by the phase of the mains voltage (2o ':) lies.
DE2264432*A 1971-04-06 1972-04-05 DEVICE AND CIRCUIT FOR CONTACTLESS HEATING OF AN ELECTRICALLY CONDUCTIVE OBJECT, IN PARTICULAR BY INDUCTIVE WAYS, AS WELL AS AUXILIARY CIRCUITS AND CONTROL AND REGULATING CIRCUITS FOR DETECTION OR. CHANGE OF THE APPLICABLE PARAMETERS Pending DE2264432A1 (en)

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DE2264432*A DE2264432A1 (en) 1971-04-06 1972-04-05 DEVICE AND CIRCUIT FOR CONTACTLESS HEATING OF AN ELECTRICALLY CONDUCTIVE OBJECT, IN PARTICULAR BY INDUCTIVE WAYS, AS WELL AS AUXILIARY CIRCUITS AND CONTROL AND REGULATING CIRCUITS FOR DETECTION OR. CHANGE OF THE APPLICABLE PARAMETERS

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US13164871A 1971-04-06 1971-04-06
DE2264432*A DE2264432A1 (en) 1971-04-06 1972-04-05 DEVICE AND CIRCUIT FOR CONTACTLESS HEATING OF AN ELECTRICALLY CONDUCTIVE OBJECT, IN PARTICULAR BY INDUCTIVE WAYS, AS WELL AS AUXILIARY CIRCUITS AND CONTROL AND REGULATING CIRCUITS FOR DETECTION OR. CHANGE OF THE APPLICABLE PARAMETERS

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116930800A (en) * 2023-09-18 2023-10-24 湖南恩智测控技术有限公司 Fuel cell impedance measuring device and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116930800A (en) * 2023-09-18 2023-10-24 湖南恩智测控技术有限公司 Fuel cell impedance measuring device and method
CN116930800B (en) * 2023-09-18 2023-12-19 湖南恩智测控技术有限公司 Fuel cell impedance measuring device and method

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