EP1590990A1 - Verfahren und system eines induktionsofens oder induktors - Google Patents
Verfahren und system eines induktionsofens oder induktorsInfo
- Publication number
- EP1590990A1 EP1590990A1 EP03815695A EP03815695A EP1590990A1 EP 1590990 A1 EP1590990 A1 EP 1590990A1 EP 03815695 A EP03815695 A EP 03815695A EP 03815695 A EP03815695 A EP 03815695A EP 1590990 A1 EP1590990 A1 EP 1590990A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage
- load
- modulation factor
- semiconductor switches
- circuit
- 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.)
- Granted
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
- H05B6/04—Sources of current
-
- 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
- H05B6/067—Control, e.g. of temperature, of power for melting furnaces
Definitions
- the invention relates to a method for feeding an induction furnace or inductor according to the preamble of claim 1.
- DE 199 26 198 A1 discloses the use of self-commutated voltage intermediate circuit converters (pulse-width modulated inverters with voltage intermediate circuit), each consisting of one or more rectifiers and one or more inverters, for the power supply of induction furnaces and inductors for inductive melting and inductive heating.
- a switching frequency is used for the inverters that is greater than the basic frequency of the respective output current.
- the inverters are connected to the parallel compensated load circuit via a coupling choke.
- WO 02/49197 A2 a method and a device for feeding an inductive load in the form of an inductor or induction furnace with a high frequency power product are known. This is achieved with any number of parallel-connected soft-switching inverters, which are fed by at least one rectifier, at least one capacitor being connected upstream in parallel to each inverter and connected to at least one voltage intermediate circuit.
- the outputs of the inverters are coupled to at least one L ⁇ C ⁇ L 2 R parallel resonant circuit, which consists of the ohmic-inductive load L 2 R, a resonance capacitor Ci and the total inductance Li of the resonance chokes.
- the inverters are switched synchronously and driven with the resonance frequency f 0 of the L ⁇ C ⁇ L 2 R parallel!
- the invention has for its object to provide a simplified method for feeding an induction furnace or inductor of the type mentioned, with which a regulation of the load voltage and the load power is realized.
- the operating frequency of the induction furnace or inductor is always exactly the same as the resonance frequency of the parallel resonant circuit, i. H. If the resonant circuit parameters change during operation, the operating frequency automatically adapts to the changing resonance frequency.
- FIG. 1 shows a basic embodiment of the circuit for supplying a
- FIG. 3 shows an optional embodiment for the circuit according to FIG. 1,
- 5 shows a simplified embodiment of the parallel resonant circuit
- 6 shows a basic embodiment with regard to the coupling chokes
- a network transformer 22 can be seen, which is connected on the primary side to a three-phase network and on the secondary side to three rectifiers 1A, 1B, 1C arranged in parallel.
- Each rectifier 1A or 1B or 1C is connected on the DC side with an intermediate circuit capacitor 21 A or 21 B or 21 C (voltage intermediate circuits) and an inverter 2A or 2B or 2C.
- the capacitance of the intermediate circuit capacitors 21 A or 21 B or 21 C is CDCL in each case.
- the inverters 2A or 2B or 2C preferably have IGBTs (or other power semiconductor switches which can be switched off) as semiconductor switches.
- the inverters 2A or 2B or 2C are connected in parallel on the AC side via coupling chokes 14A or 14B or 14C.
- the inductance of a coupling choke 14A or 14B or 14C is Lc in each case.
- the inverter output currents of the inverters 2A or 2B or 2C are l A or I B or lc.
- the total inverter output current l ⁇ is
- the inverter output currents I A , I B, I C have similar courses and mutually similar or identical amplitudes.
- the ohmic-inductive load 16 is formed by the furnace coil of an induction furnace or the coil of an inductor and has an inductive component 19 and an ohmic component 20.
- Important sizes of the parallel resonant circuit 15 are:
- the coupling chokes 14A, 14B, 14C limit the di / dt (rate of change over time) of the inverter output currents, IB, lc and are not effective as components of the parallel resonant circuit 15 itself.
- the inverter output currents I A , I B, I C are discontinuous and not sinusoidal.
- the current profile of the resonant circuit input current l ⁇ is discontinuous and not sinusoidal.
- the resonance frequency f 0 of the parallel resonant circuit 15 depends only on the parameters of the parallel resonant circuit and can be derived as follows:
- the operating frequency of the ohmic-inductive load or the induction furnace or the inductor corresponds to the resonance frequency f 0 . It can only be stated in passing that the circuit is in principle also suitable for a simplified embodiment consisting of a rectifier, an intermediate circuit with an intermediate circuit capacitor and an inverter.
- FIG. 2 shows exemplary time profiles of quantities of interest (current, voltages) for the circuit according to FIG. 1, wherein
- FIG. 3 shows an optional embodiment for the circuit according to FIG. 1. Only a rectifier 1 is connected to the secondary side of the mains transformer 22 and is connected on the DC side to the intermediate circuit capacitors 21A or 21B or 21C and the inverters 2A or 2B or 2C. The rest of the circuit arrangement is as described under Fig. 1.
- FIGS. 1 and 3 show a basic embodiment with respect to the parallel resonant circuit.
- the parallel resonant circuit 15 with two resonance capacitors 17, 18 and the load 16 can also be seen in FIGS. 1 and 3.
- FIG. 5 shows a simplified embodiment of the parallel resonant circuit.
- the resonance capacitor 18 is omitted, ie the capacitance Ci of the resonance capacitor 17 corresponds to the capacitance C effective in the parallel resonant circuit.
- the resonance frequency f 0 of the parallel resonant circuit thus results in:
- FIG. 6 shows a basic embodiment with regard to the coupling chokes. They are the interconnected in both AC connection lines of the inverter 2A arranged coupling chokes 14A, preferably magnetically coupled air chokes. The same measures apply to the other inverters 2B, 2C.
- FIG. 7 shows optional embodiments with regard to the coupling chokes.
- a coupling choke 14A ' is arranged only in the first AC-side connecting line of the inverter 2A.
- coupling chokes 14A"'and 14A which are not coupled to one another and are arranged in both AC connection lines of the inverter 2A are arranged. " provided. The same measures apply to the other inverters 2B, 2C.
- the main task of the regulation is to regulate and stabilize the load power pi and the load voltage URL. This is done by regulating a modulation factor m (0 ⁇ m ⁇ 1), which is fed to the input of a synchronized pulse width modulator 7. From the modulation factor m, this pulse width modulator 7 forms the corresponding lead times t m (switch-on times) of the semiconductor switches of the inverters 2A, 2B, 2C.
- Semiconductor switch drivers 8 effect the conversion of the determined lead times t m into the corresponding concrete signals for controlling (switching on, switching off) the semiconductor switches.
- a voltage measuring element 12 determines the time profile of the load voltage URL, from which a measured variable U
- a first comparison point forms the difference between a load voltage setpoint u * * and that available at the output of the voltage calculator 11 calculated load voltage u ⁇ and leads the determined difference to a voltage regulator (preferably PI regulator) 3. From this, the voltage regulator 3 forms a modulation factor setpoint m u * and feeds it to an analog gate circuit 5.
- a voltage regulator preferably PI regulator
- a second comparison point forms the difference between a load power setpoint P * * and the calculated load power pi available at the output of the power calculator 10 and feeds the determined difference to a power controller (preferably a PI controller) 4.
- the power controller 4 forms a modulation factor setpoint m p * from this and also feeds this to the analog gate circuit 5, which forms the modulation factor m from the input modulation factors m u * and m p * , which ensures that the load power pi and the Load voltage URL can be regulated and stabilized as required.
- the configuration consisting of the components voltage regulator 3, power regulator 4 and analog gate circuit 5 is referred to as a parallel regulator structure 6.
- the pulse width modulator 7 ensures that the beginning of each conduction period t m with the load voltage or its measured variable U
- the synchronized pulse width modulator 7 has an input for specifying a maximum modulation factor limit value miim, which is specified by a current limiter 9.
- the current limiter 9 forms this modulation factor limit value r ⁇ i
- This additional measure ensures that the semiconductor switches are not loaded with an excessively high current, that is to say the guide times t m of the semiconductor switches are specified in such a way that safe and optimal operation of the induction furnace or inductor is guaranteed under all operating conditions.
- the set guide time t m is relatively short in relation to the oscillation period T 0 .
- the waveforms of the load voltage U R as a dotted trace
- the inverter output voltage UI NV Erter a 's dash-dotted trace the resonant capacitor voltage U C ⁇ as a dotted trace
- the oscillator circuit input current l ⁇ as a solid polyline.
- the set guide time t m is relatively long in relation to the oscillation period T 0 . Again the time profiles of URL, UINVERTER, Uci and l ⁇ can be seen.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Inverter Devices (AREA)
- General Induction Heating (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10304505A DE10304505A1 (de) | 2003-02-05 | 2003-02-05 | Verfahren zur Speisung eines Induktionsofens oder Induktors |
| DE10304505 | 2003-02-05 | ||
| PCT/EP2003/014764 WO2004071132A1 (de) | 2003-02-05 | 2003-12-23 | Verfahren und system eines induktionsofens oder induktors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1590990A1 true EP1590990A1 (de) | 2005-11-02 |
| EP1590990B1 EP1590990B1 (de) | 2006-11-02 |
Family
ID=32747553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03815695A Expired - Lifetime EP1590990B1 (de) | 2003-02-05 | 2003-12-23 | Verfahren zur speisung eines induktionsofens oder induktors |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1590990B1 (de) |
| AT (1) | ATE344610T1 (de) |
| AU (1) | AU2003296711A1 (de) |
| DE (2) | DE10304505A1 (de) |
| ES (1) | ES2274323T3 (de) |
| WO (1) | WO2004071132A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010025949A1 (de) | 2010-07-02 | 2012-01-05 | Sms Elotherm Gmbh | Ansteuerung eines Wechselrichters |
| DE102014112456B4 (de) * | 2014-08-29 | 2020-09-24 | Schott Ag | Vorrichtung und Verfahren zur Beheizung einer Schmelze |
| PL3737210T3 (pl) * | 2019-05-10 | 2022-12-05 | BSH Hausgeräte GmbH | Urządzenie pieca indukcyjnego |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4277667A (en) * | 1978-06-23 | 1981-07-07 | Matsushita Electric Industrial Co., Ltd. | Induction heating apparatus with negative feedback controlled pulse generation |
| WO1981000801A1 (en) * | 1979-09-17 | 1981-03-19 | Matsushita Electric Industrial Co Ltd | Inductive heating equipment |
| DE3731555C1 (en) * | 1987-09-19 | 1988-12-15 | Aeg Elotherm Gmbh | Induction heating device with a setting preset controlled by the actual value |
| DE4005129A1 (de) * | 1990-02-17 | 1991-08-22 | Degussa | Vorrichtung zur induktiven erwaermung von koerpern mittels hochfrequenter schwingungen |
| US6124581A (en) * | 1997-07-16 | 2000-09-26 | Illinois Tool Works Inc. | Method and apparatus for producing power for an induction heating source |
| US6163019A (en) * | 1999-03-05 | 2000-12-19 | Abb Metallurgy | Resonant frequency induction furnace system using capacitive voltage division |
| WO2001052602A1 (en) * | 2000-01-13 | 2001-07-19 | Electric Power Research Institute, Inc. | Apparatus and method for inductive heating |
| DE10110375B4 (de) * | 2001-03-03 | 2009-07-30 | Abp Induction Systems Gmbh | Induktionserwärmungsanlage |
-
2003
- 2003-02-05 DE DE10304505A patent/DE10304505A1/de not_active Withdrawn
- 2003-12-23 WO PCT/EP2003/014764 patent/WO2004071132A1/de not_active Ceased
- 2003-12-23 ES ES03815695T patent/ES2274323T3/es not_active Expired - Lifetime
- 2003-12-23 AT AT03815695T patent/ATE344610T1/de not_active IP Right Cessation
- 2003-12-23 AU AU2003296711A patent/AU2003296711A1/en not_active Abandoned
- 2003-12-23 EP EP03815695A patent/EP1590990B1/de not_active Expired - Lifetime
- 2003-12-23 DE DE50305611T patent/DE50305611D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2004071132A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2274323T3 (es) | 2007-05-16 |
| EP1590990B1 (de) | 2006-11-02 |
| DE50305611D1 (de) | 2006-12-14 |
| AU2003296711A1 (en) | 2004-08-30 |
| DE10304505A1 (de) | 2004-08-26 |
| ATE344610T1 (de) | 2006-11-15 |
| WO2004071132A1 (de) | 2004-08-19 |
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