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GB1019901A - Improvements relating to electric converter circuits - Google Patents

Improvements relating to electric converter circuits

Info

Publication number
GB1019901A
GB1019901A GB3219361A GB3219361A GB1019901A GB 1019901 A GB1019901 A GB 1019901A GB 3219361 A GB3219361 A GB 3219361A GB 3219361 A GB3219361 A GB 3219361A GB 1019901 A GB1019901 A GB 1019901A
Authority
GB
United Kingdom
Prior art keywords
heater
thyristor
circuit
capacitor
supply
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
GB3219361A
Inventor
John MERRETT
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.)
Hoover Ltd
Original Assignee
Hoover 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 to NL283002D priority Critical patent/NL283002A/xx
Application filed by Hoover Ltd filed Critical Hoover Ltd
Priority to GB3219361A priority patent/GB1019901A/en
Publication of GB1019901A publication Critical patent/GB1019901A/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
    • 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
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/07—Heating plates with temperature control means

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetic Treatment Devices (AREA)
  • Cookers (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

1,019,901. Automatic temperature control. HOOVER Ltd. Aug. 31, 1962 [Sept. 7, 1961; July 31, 1962 No. 32193/61 and 29431/62. Heading G3R. [Also in Divisions H2 and H3] An electric converter circuit (Fig. 1) includes a thyristor 10 with an inductance which may be or may include an induction heater 11, in series with it, and in parallel with it a series resonant circuit having a capacitor 15 and an air cored inductor 16. The circuits may be used for an ultransonic vibration generator, in which case the capacitor 15 is a ceramic capacitor transducer forming the load. The induction heater is in the form of a flat spiral and operates by inducing eddy currents in the base of the pot standing on it. A low hole storage diode 17 may be connected in parallel with the heater. When the d.c. supply is connected at terminals 13, 14 the capacitor 15 becomes charged. On triggering the thyristor current flows both from the supply and from the charged capacitor through the thyristor and the load. As the circuit is oscillatory the current reverse after a time, and the thyristor cuts off. The power supplied is therefore a function of the frequency at which the thyristor is triggered. The oscillator 18 which provides trigger pulses for the thyristor may be free running as described below with reference Fig. 2 or it may be triggered by a pulse derived from the induction heater circuit at the moment it turns off (Fig. 3 not shown). In the triggered form a frequency of 25kc/c is possible. Control circuits. The main oscillator comprises transistor 25 and transformer 26 connected as shown to a supply derived from the main d.c. supply resistor 41 and Zener diode 42. The frequency is determined by the potential of point 35, which is controlled by variable resistor 36 and the temperature regulating circuit. Capacitor 40 causes the circuit to start up slowly so that the protection circuit (below) has time to operate if the heater is not loaded The temperature sensitive resistor 57 passes a current, dependent on the heater temperature, which supplies the tunnel diode oscillator comprising tunnel diode 50 and transformer 51. The rectified output of transformer 51 is applied to point 35 (to control the main oscillator) and this output is a function of the current in the temperature sensitive resistor 57. Protection. If the pot is removed from the heater the supply is turned off by a manually reset relay 21, 22 connected across the heater through a diode 47 and current limiting inductor 46.
GB3219361A 1961-09-07 1961-09-07 Improvements relating to electric converter circuits Expired GB1019901A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL283002D NL283002A (en) 1961-09-07
GB3219361A GB1019901A (en) 1961-09-07 1961-09-07 Improvements relating to electric converter circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3219361A GB1019901A (en) 1961-09-07 1961-09-07 Improvements relating to electric converter circuits

Publications (1)

Publication Number Publication Date
GB1019901A true GB1019901A (en) 1966-02-09

Family

ID=10334739

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3219361A Expired GB1019901A (en) 1961-09-07 1961-09-07 Improvements relating to electric converter circuits

Country Status (2)

Country Link
GB (1) GB1019901A (en)
NL (1) NL283002A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2230186A1 (en) * 1971-11-19 1973-05-24 Gen Electric INDUCTION COOKING APPLIANCE
GB2130823A (en) * 1982-09-21 1984-06-06 Bl Tech Ltd Power supply
GB2153111A (en) * 1984-01-20 1985-08-14 Toshiba Kk Induction heat cooking apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2230186A1 (en) * 1971-11-19 1973-05-24 Gen Electric INDUCTION COOKING APPLIANCE
GB2130823A (en) * 1982-09-21 1984-06-06 Bl Tech Ltd Power supply
GB2153111A (en) * 1984-01-20 1985-08-14 Toshiba Kk Induction heat cooking apparatus
US4638135A (en) * 1984-01-20 1987-01-20 Kabushiki Kaisha Toshiba Induction heat cooking apparatus

Also Published As

Publication number Publication date
NL283002A (en)

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