WO1988003351A1 - Source d'alimentation impulsionnelle sans bobine de self pour chauffage par induction - Google Patents

Source d'alimentation impulsionnelle sans bobine de self pour chauffage par induction Download PDF

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Publication number
WO1988003351A1
WO1988003351A1 PCT/HU1987/000047 HU8700047W WO8803351A1 WO 1988003351 A1 WO1988003351 A1 WO 1988003351A1 HU 8700047 W HU8700047 W HU 8700047W WO 8803351 A1 WO8803351 A1 WO 8803351A1
Authority
WO
WIPO (PCT)
Prior art keywords
thyristor
inductor
voltage
main circuit
cathode
Prior art date
Application number
PCT/HU1987/000047
Other languages
German (de)
English (en)
Inventor
László KOLLER
György TEVAN
Original Assignee
Budapesti Mu^"Szaki Egyetem
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 Budapesti Mu^"Szaki Egyetem filed Critical Budapesti Mu^"Szaki Egyetem
Publication of WO1988003351A1 publication Critical patent/WO1988003351A1/fr

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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
    • H05B6/04—Sources of current

Definitions

  • the invention relates to a simply constructed, pulse-operated feed source with thyristors that serves for inductive heating and does not contain a choke coil in the main circuit.
  • the space requirement of this supply source is generally much less compared to the previously common, thyristorized inverters with an oscillating circuit, the mass is smaller, the design is cheaper, the effectiveness is higher, and a much more flexible operation can be achieved with it.
  • a further cost saving can be achieved in that, in the majority of cases, there is no need to change the voltage of the supply source supplying the direct voltage, since the power of the supply source according to the invention is continuously increased from zero to the nominal value by the ignition of the thyristor present in the oscillation circuit can be changed.
  • the object of the invention was to create a pulsed supply source that retains or increases all the advantages of the known pulsed supply sources, but does not have their disadvantageous characteristics, that is, a choke coil is not included and no direct current component is produced in the inductor current . In this way, a higher efficiency can be achieved and better parameters can be achieved not only with pulse sources, but with all thyristorized supply sources.
  • FIG. 1 shows the circuit arrangement of the main circuit of the feed source according to the invention
  • FIG. 2 shows the time functions of the inductor current i and the capacitor voltage u c during the function of the feed source in the stabilized
  • the invention relates - in accordance with the objective - to a pulse source for inductive heating;
  • the main circuit which is essential, contains a charge thyristor, a charge thyristor, a discharge thyristor, a discharge diode and a capacitor, furthermore the main circuit is connected with its input terminals to a direct voltage supply source, with the output terminals to an inductor provided with an insert;
  • the feed source according to the invention can be characterized in that - as can be seen from FIG.
  • the first input terminal 1 - the first input terminal 1 is located in the main circuit is connected to the negative pole of the DC voltage supply source and the cathode of the charge thyristor T2, while the second input terminal 2 connects the positive pole of the DC voltage supply source and the anode of the discharge thyristor and the cathode of the discharge diode Dl, the first output terminal of the main circuit is common to the second input terminal 2 connected to one terminal of the inductor I provided with the insert 8; the other terminal of the inductor I forms the second output terminal, which is connected to the node 4 via the capacitor C, and the node 4 is connected to the charge thyristor 2 and the anode of the discharge diode D1, and to the cathode of the discharge thyristor T1.
  • the main circuit shown in Figure 1 incorporates the essence and novelty of the invention.
  • This main circuit is connected to control, regulating and protective elements which are essential for the operation of the feed source according to the invention.
  • the elements mentioned do not affect the essence of the invention and, furthermore, are known and equivalent elements, they are not detailed here.
  • the structure is legally discussed in a depth that is absolutely necessary to know the function of the apparatus according to the invention.
  • the input of the main circuit according to Figure 1 is connected to the DC voltage source.
  • this DC voltage source can be formed by a rectifier, the terminals of which are connected to a smoothing capacitor.
  • the rectifier itself can be implemented in numerous versions: with one or three phase bridge circuit, with diode, possibly with thyristor, etc.
  • the last-mentioned more expensive solution does not have to be applied to the feed source according to the invention, since the continuous regulation of the power is solved by the inverter itself.
  • the output of the main circuit is connected to the inductor I, which is in a magnetic coupling with the insert to be heated.
  • the inductor can not only be connected directly to the output of the inductor - as shown in FIG. 1 - it is also possible to implement the connection with an inserted matching transformer.
  • This current is conducted in one direction by the discharge thyristor T1 and in the other direction by the discharge diode D1.
  • the prerequisite for vibration is the existence of inequality
  • the voltage of the capacitor C also performs a decaying oscillation; after the period T has elapsed, the voltage U 11 ⁇ U o remains, ie part of the energy has been lost.
  • the charge thyristor T2 with the voltage U o is in the forward direction biased.
  • a second pulse generator is controlled, which switches the first input terminal 1 and the charge control electrode 6 when the voltage U 11 occurs , with a corresponding power, a needle-like voltage pulse.
  • this voltage pulse has a positive polarity, as a result of which the charge thyristor T2, which is biased in the forward direction with the voltage / U o -U 11 /, begins to conduct, while the decaying oscillation lasts for half a period / T / 2 / the capacitor
  • T i 1.5 T + tq 2/3 / exists, where tq 2 denotes the release time of the charge thyristor T2, the apparatus will operate continuously and the stabilized state will be established.
  • the relation / 3 / can also be maintained automatically with the first pulse generator, in such a way that the generator between the second input terminal 2 and the node 4 perceives the voltage jump occurring per period time T when the current of the discharge diode D1 ceases, and in accordance therewith the pulses delivers.
  • the prerequisite for the function of the feed source according to the invention is that for the release time tq 1 of the discharge thyristor T1 the relation c / V exist. If thyristors with the same free time
  • U z is the maximum voltage on the thyristors in the
  • I eff denote the root mean square of the current flowing through the thyristors.
  • the quantity after the product U z .I eff is called the power of the thyristors.
  • the utilization factor of the thyristors of the feed source according to the invention is practically identical to that of the pulse operation feed source according to the patent HU-PS 186043.
  • the supply source according to the invention which operates in pulsed mode, contains - in contrast to the previous solutions - no choke coil.
  • the inductor I itself takes on the role of the inductor, in which the loss - which occurs as a result of the current flowing through the charging of the capacitor C - is converted into useful heat. It can be confirmed that that
  • the efficiency of the feed source according to the invention exceeds all the efficiencies of the inverters that have been customary up to now. Compared to the inverters in bridge connection, the increase in efficiency can also reach 5%. Compared to the inverters in pulse mode according to the patent HU-PS 186043, the increase in efficiency is even greater.
  • the inductor current of the inverter according to the invention contains no DC component.
  • the feed source according to the invention is capable of adapting flexibly and between wide limits to the change in the parameters / R S and L S / which can be measured at the terminals of the inductor I, until the relations / 2 /, / 3 / and / 4 / exist.
  • the majority In practical cases, the inductance L S that can be measured at the terminals of inductor I, compared with the empty (without insert) inductors not provided with insert 8, decreases due to the de-energizing effect of the eddy currents induced in insert B.
  • a given inductor I is dimensioned to a state that represents the greatest load, ie the relations / 2 /, / 3 / and / 4 / exist, these will also be the case of any decrease in the load, ie also be present with an empty inductor, the apparatus remaining operational.
  • the apparatus is dimensioned taking into account the inductor I - which means the lowest inductance L S - it will also work with an increasing L S value.
  • the feed source dimensioned for an inductor I with the lowest possible inductance and for the insert B with the greatest load remains operable with any system of the inductor insert, which in comparison with all the known inverters offers a high degree of flexibility brings itself.
  • the nominal power supplied by the supply source decreases approximately with the square root of the ratio of the inductance increase. If this power is not sufficient, the frequency of the pulse groups has to be increased due to the increased frequency.
  • the supply source according to the invention can be switched off either by switching off the supply voltage or by the first pulse generator. In both cases, there is a residual voltage on the capacitor C. the capacitor C must be discharged.
  • the pulsed supply source without choke coil has the following advantages:
  • the cut-off frequency is higher / compared to the inverters in bridge connection about 3.2 times /, compared to the inverters in bridge connection, there are the following advantages:

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Inverter Devices (AREA)

Abstract

Source d'alimentation impulsionnelle pour chauffage par induction, constituée essentiellement par le circuit principal. Dans ce dernier, la première borne d'entrée (1) se raccorde au pôle négatif de la source d'alimentation en tension continue et à la chathode du thyristor de charge (T2), tandis que la deuxième borne d'entrée (2) est reliée au pôle positif de la source d'alimentation en tension continue, à l'anode du thyristor de décharge (T1) et à la cathode de la diode de décharge (D1). La première borne de sortie du circuit principal est commune avec la deuxième borne d'entrée (2), laquelle est reliée à l'inducteur (I) muni d'un insert (B), et l'autre borne de l'inducteur (I) forme la deuxième borne de sortie (3). Cette dernière se raccorde via le condensateur (C) au point nodal (4) qui est relié au thyristor de charge (T2), à la diode de décharge (D1) et à la cathode du thyristor de décharge (T1). Font également partie de la source d'alimentation décrite les éléments de régulation, de commande et de protection nécessaires à la mise en marche, à l'actionnement et à l'arrêt.
PCT/HU1987/000047 1986-10-24 1987-10-23 Source d'alimentation impulsionnelle sans bobine de self pour chauffage par induction WO1988003351A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HU4470/86 1986-10-24
HU447086A HU196683B (en) 1986-10-24 1986-10-24 Pulse-operation supply unit without choke for induction heating

Publications (1)

Publication Number Publication Date
WO1988003351A1 true WO1988003351A1 (fr) 1988-05-05

Family

ID=10968050

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/HU1987/000047 WO1988003351A1 (fr) 1986-10-24 1987-10-23 Source d'alimentation impulsionnelle sans bobine de self pour chauffage par induction

Country Status (3)

Country Link
EP (1) EP0327561A1 (fr)
HU (1) HU196683B (fr)
WO (1) WO1988003351A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2573604A1 (fr) * 1984-11-22 1986-05-23 Eisenberg Roger Dispositif electronique de puissance pour le chauffage induction

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2573604A1 (fr) * 1984-11-22 1986-05-23 Eisenberg Roger Dispositif electronique de puissance pour le chauffage induction

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Unexamined Applications, Section M, Volume 1, No 122, 14 October 1977, The Patent Office Japanese Government, page 3889 M 77, Kokai-No 52-57 537 (Matsushita). *

Also Published As

Publication number Publication date
EP0327561A1 (fr) 1989-08-16
HU196683B (en) 1988-12-28

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