CN113890404A - Phase shift angle adjustable three-phase intermediate frequency power supply circuit - Google Patents
Phase shift angle adjustable three-phase intermediate frequency power supply circuit Download PDFInfo
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- CN113890404A CN113890404A CN202111292504.1A CN202111292504A CN113890404A CN 113890404 A CN113890404 A CN 113890404A CN 202111292504 A CN202111292504 A CN 202111292504A CN 113890404 A CN113890404 A CN 113890404A
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- 230000010363 phase shift Effects 0.000 title claims abstract description 15
- 230000005284 excitation Effects 0.000 claims abstract description 14
- 230000006698 induction Effects 0.000 claims description 27
- 238000000819 phase cycle Methods 0.000 claims description 19
- 239000003990 capacitor Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 11
- 101100365087 Arabidopsis thaliana SCRA gene Proteins 0.000 claims description 7
- 101150105073 SCR1 gene Proteins 0.000 claims description 7
- 101100134054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NTG1 gene Proteins 0.000 claims description 7
- 101000668165 Homo sapiens RNA-binding motif, single-stranded-interacting protein 1 Proteins 0.000 claims description 6
- 102100039692 RNA-binding motif, single-stranded-interacting protein 1 Human genes 0.000 claims description 6
- 230000033228 biological regulation Effects 0.000 claims description 4
- 238000003756 stirring Methods 0.000 description 24
- 239000002184 metal Substances 0.000 description 19
- 230000009471 action Effects 0.000 description 11
- 238000003723 Smelting Methods 0.000 description 7
- 238000002844 melting Methods 0.000 description 7
- 230000008018 melting Effects 0.000 description 7
- 230000004907 flux Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000000956 alloy Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000155 melt Substances 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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Classifications
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- 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
- H02M7/521—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 in a bridge configuration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/06—Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
- F27B14/061—Induction furnaces
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- General Induction Heating (AREA)
Abstract
The invention discloses a phase-shift angle adjustable three-phase intermediate frequency power supply circuit, which comprises an excitation control circuit, a three-phase control circuit and three groups of half-bridge series inversion main circuits, wherein the excitation control circuit is electrically connected with the three-phase control circuit, the three-phase control circuit is electrically connected with the three groups of half-bridge series inversion main circuits, and the three groups of half-bridge series inversion main circuits are electrically connected with the other control circuit.
Description
Technical Field
The invention belongs to the technical field of power supply circuits, and particularly relates to a three-phase intermediate frequency power supply circuit with an adjustable phase shift angle.
Background
When a medium-frequency induction furnace is used for smelting metal materials, the induced current is acted by electromagnetic force in a magnetic field, so that molten metal flows in a molten pool in a certain direction, the stirring phenomenon in the metal smelting process is generated, and the distribution of alloy elements in the molten metal tends to be uniform by the stirring.
The structure block diagram of the single-phase induction heating power supply and the induction melting furnace is shown in the attached figure 1.
In fig. 2, the main circuit is a series inverter circuit in a half-bridge structure, which is composed of a filter capacitor C1, a resonant capacitor C2, an inverter bridge element SCR1 and an SCR 2. The direct current sensor LF1, the intermediate frequency current transformer LF2 and the intermediate frequency voltage transformer YF1 are circuit parameter detecting elements for feedback control of the circuit.
The control circuit consists of a direct current regulator, an intermediate frequency parameter regulator, a voltage controlled oscillator, a trigger pulse forming circuit and an overcurrent and overvoltage protection circuit. The feedback signal of the circuit is used for controlling the circuit to regulate and protect the operation parameters of the inverter bridge, and the trigger pulse of the inverter bridge operates in the 'other excitation' mode without depending on the synchronous control of the main circuit.
As can be seen from fig. 2, the output current of the main circuit is directly connected to the furnace induction coil, which is a typical application of a conventional induction furnace. In the operation mode, the single-phase medium-frequency current generates an alternating magnetic field and an induction current in the molten metal of the induction furnace, and the induction current is acted by the magnetic field force while heating the metal furnace burden to enable the molten metal to flow, which is a special electromagnetic stirring phenomenon of the medium-frequency induction smelting furnace.
The electromagnetic stirring phenomenon in the metal smelting process is beneficial to uniformly mixing alloy elements in a melt, and is a function required by the metal smelting process, but the electromagnetic stirring intensity of the single-phase medium-frequency induction smelting furnace is related to the working frequency and the operating power; the lower the frequency, the higher the power and the more intense the stirring. However, the stirring function of the single-phase induction melting furnace has two defects:
firstly, the stirring process is partitioned, fig. 3A shows the stirring state of the single-phase induction melting furnace, and the direction of the magnetic field force applied to the circumferential pulsating current generated in the metal material in the furnace points to the middle position of the magnetic field axis, so that a group of stirring cycles that the peripheral metal of the upper half part in fig. 3A flows downwards and the central metal is pushed upwards is formed; there is also a set of stirring cycles where the metal flows up the lower half perimeter and the central metal is pushed down. The sectional stirring mode can not ensure the upper and lower allowance of alloy components and can not meet the occasions with higher alloy uniformity requirements
Secondly, the stirring intensity of the single-phase induction power supply can not be adjusted, and the single-phase induction power supply can not be compatible when the heat preservation working condition, the heat preservation power requirement and the stirring intensity requirement conflict, so that the capability of meeting the smelting process requirement is poor.
Disclosure of Invention
In order to solve the problems, the invention provides a three-phase intermediate frequency power supply circuit with an adjustable phase shift angle, the phase difference of the three-phase intermediate frequency power supply can be adjusted within the range of 0-90 degrees, the phase sequence can be switched, and the circuit has the advantages of high stirring uniformity and adjustable stirring strength.
In order to realize the functions, the technical scheme adopted by the invention is as follows: a phase shift angle adjustable three-phase intermediate frequency power circuit comprises an exciting control circuit, a three-phase control circuit and three groups of half-bridge series inversion main circuits, wherein the exciting control circuit is electrically connected with the three-phase control circuit;
the excitation control circuit is used for generating source pulses, and the operation regulation function of the whole system is completed by the excitation control circuit;
the three-phase control circuit adopts a pulse phase-shifting mode to obtain inversion trigger pulses with different phases;
the output current of the three groups of half-bridge series inversion main circuits is directly connected with the induction coil of the heating furnace;
the three-phase control circuit comprises a trigger pulse phase-shifting circuit, a phase sequence switching circuit, a trigger pulse forming circuit and an overcurrent and overvoltage protection circuit, wherein the trigger pulse phase-shifting circuit is electrically connected with the trigger pulse phase-shifting circuit and the phase sequence switching circuit;
the three groups of half-bridge series inversion main circuits are based on a single-phase induction heating power supply, two groups of inversion bridges are added in the main circuit, a three-phase control circuit is added in the control circuit, the three-phase control circuit adopts a pulse phase shifting mode to obtain inversion trigger pulses with different phases, heating coils of the induction furnace are divided into three groups which are respectively connected with a three-phase power supply, the three-phase power supply works at the same frequency, the phase difference is adjustable, and the phase sequence is switchable;
under the action of three-phase current, magnetic flux in the furnace generates a rotating component, and the electric force borne by the induced current in the metal melt in the rotating magnetic field component is consistent in the whole axis, namely, under the action of a positive sequence magnetic field, the induced current along the furnace wall is subjected to upward electric force; under the action of the reverse sequence magnetic field, the induced current along the furnace wall is subjected to downward electric power, and in actual operation, the melt stirring direction is changed by changing the phase sequence of three-phase current;
the strength of the rotating magnetic flux component of the three-phase current depends on the phase difference of the three-phase current, so that the stirring strength can be changed by changing the phase difference of the three-phase current.
Preferably, the three groups of main half-bridge series inversion circuits comprise three groups of inverter bridge circuits, and the inverter bridge circuits comprise a filter capacitor C1, a resonance capacitor C2, an inverter bridge element SCR1, an inverter bridge element SCR2, a direct current sensor LF1, an intermediate frequency current transformer LF2 and an intermediate frequency voltage transformer YF 1;
the filter capacitor C1, the resonance capacitor C2, the inverter bridge element SCR1 and the inverter bridge element SCR2 form a series inverter circuit in a half-bridge structure;
the direct current sensor LF1, the intermediate frequency current transformer LF2 and the intermediate frequency voltage transformer YF1 are circuit parameter detecting elements for feedback control of the circuit.
Preferably, the three groups of inverter bridge circuits work at the same frequency, the phase difference is adjustable, and the phase sequence is switchable.
The control circuit comprises a DC current regulator, an intermediate frequency parameter regulator, a voltage-controlled oscillator, a trigger pulse forming circuit and a DC overcurrent protection circuit, wherein a feedback signal of the circuit is used for regulating and protecting the operation parameters of the inverter bridge by the control circuit, and the trigger pulse of the inverter bridge does not depend on the synchronous control of the main circuit and operates in the mode of the control circuit.
The invention adopts the structure to obtain the following beneficial effects: the phase-shift angle adjustable three-phase intermediate frequency power supply circuit provided by the invention is simple to operate, compact in structure and reasonable in design, the excitation control circuit is used for generating source pulses, and the operation adjusting function of the whole system is completed by the excitation control circuit; the three-phase control circuit adopts a pulse phase-shifting mode to obtain inversion trigger pulses with different phases; the output current of the three groups of half-bridge series inversion main circuits is directly connected with the induction coil of the heating furnace; the three-phase power supply works at the same frequency, the phase difference is adjustable, and the phase sequence is switchable; under the action of three-phase current, magnetic flux in the furnace generates a rotating component, and the electric force borne by the induced current in the metal melt in the rotating magnetic field component is consistent in the whole axis, namely, under the action of a positive sequence magnetic field, the induced current along the furnace wall is subjected to upward electric force; under the action of the reverse-sequence magnetic field, the induced current along the furnace wall is subjected to downward electric power; the strength of the rotating magnetic flux component of the three-phase current depends on the phase difference of the three-phase current, so that the stirring strength can be changed by changing the phase difference of the three-phase current.
Drawings
FIG. 1 is a circuit diagram of a three-phase IF power circuit with adjustable phase shift angle according to the present invention;
fig. 2 is a circuit diagram of a single phase induction heating power supply and an induction melting furnace;
FIG. 3A is a diagram showing a stirring state of the single-phase induction melting furnace;
FIG. 3B is a metal flow pattern in the furnace under the action of a positive sequence magnetic field in the three-phase medium frequency power circuit with an adjustable phase shift angle according to the present invention;
fig. 3C is a metal flow pattern in the furnace under the action of a reverse magnetic field in the three-phase intermediate frequency power circuit with an adjustable phase shift angle according to the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The present invention will be described in further detail with reference to the accompanying drawings.
The invention relates to a phase-shift angle adjustable three-phase intermediate frequency power circuit, which comprises an excitation control circuit, a three-phase control circuit and three groups of half-bridge series inversion main circuits, wherein the excitation control circuit is electrically connected with the three-phase control circuit;
the excitation control circuit is used for generating source pulses, and the operation regulation function of the whole system is completed by the excitation control circuit;
the three-phase control circuit adopts a pulse phase-shifting mode to obtain inversion trigger pulses with different phases;
the output current of the three groups of half-bridge series inversion main circuits is directly connected with the induction coil of the heating furnace;
the three-phase control circuit comprises a trigger pulse phase-shifting circuit, a phase sequence switching circuit, a trigger pulse forming circuit and an overcurrent and overvoltage protection circuit, wherein the trigger pulse phase-shifting circuit is electrically connected with the trigger pulse phase-shifting circuit and the phase sequence switching circuit;
the three groups of half-bridge series inversion main circuits comprise three groups of inversion bridge circuits, and each inversion bridge circuit comprises a filter capacitor C1, a resonance capacitor C2, an inversion bridge element SCR1, an inversion bridge element SCR2, a direct current sensor LF1, an intermediate frequency current transformer LF2 and an intermediate frequency voltage transformer YF 1;
the filter capacitor C1, the resonance capacitor C2, the inverter bridge element SCR1 and the inverter bridge element SCR2 form a series inverter circuit in a half-bridge structure;
the direct current sensor LF1, the intermediate frequency current transformer LF2 and the intermediate frequency voltage transformer YF1 are circuit parameter detecting elements for feedback control of the circuit.
The three groups of inverter bridge circuits work at the same frequency, the phase difference is adjustable, and the phase sequence is switchable.
The control circuit comprises a DC current regulator, an intermediate frequency parameter regulator, a voltage-controlled oscillator, a trigger pulse forming circuit and a DC overcurrent protection circuit, wherein a feedback signal of the circuit is used for regulating and protecting the operation parameters of the inverter bridge by the control circuit, and the trigger pulse of the inverter bridge does not depend on the synchronous control of the main circuit and operates according to the mode of the control circuit.
The induction melting furnace that this patent relates to adopts three-phase intermediate frequency power supply to heat induction melting furnace, and three-phase intermediate frequency power supply phase difference can be adjusted at 0-90 degrees within ranges, and the phase sequence is changeable, has the stirring degree of consistency height, and stirring intensity adjustable superior characteristic, the three-phase intermediate frequency power supply system structure block diagram of adjustable phase difference shows by figure 1:
the circuit of fig. 1 comprises an excitation control circuit, a three-phase control circuit and three groups of half-bridge series inversion main circuits.
The three-phase control circuit is a core control circuit of the system and consists of a trigger pulse phase-shifting circuit, a phase sequence switching circuit, a trigger pulse forming circuit and an overcurrent and overvoltage protection circuit. The control circuit is used for generating source pulses, and the operation regulation function of the whole system is completed by the control circuit.
As shown in fig. 1, the three-phase inverter power supply is based on a single-phase induction heating power supply, two groups of inverter bridges are added to a main circuit, a three-phase control circuit is added to the control circuit, and the three-phase control circuit adopts a pulse phase-shifting mode to obtain inverter trigger pulses with different phases. The heating coils of the induction furnace are divided into three groups which are respectively connected with a three-phase power supply. The three-phase power supply works at the same frequency, the phase difference is adjustable, and the phase sequence is switchable.
Under the action of three-phase current, magnetic flux in the furnace generates a rotation component, and the electric force borne by the induced current in the metal melt in the rotation magnetic field component is consistent in the whole axis, namely, under the action of a positive sequence magnetic field, the induced current along the furnace wall is subjected to upward electric force, and the metal flowing direction in the furnace is shown as figure 3B; under the action of the reverse sequence magnetic field, the induced current along the furnace wall is subjected to downward electric force, and the metal flowing direction in the furnace is shown as figure 3C. In practical operation, the melt stirring direction is changed by changing the phase sequence of three-phase current.
The strength of the rotating magnetic flux component of the three-phase current depends on the phase difference of the three-phase current, so that the stirring strength can be changed by changing the phase difference of the three-phase current.
The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. The utility model provides a phase shift angle adjustable three-phase intermediate frequency power supply circuit which characterized in that: the three-phase control circuit is electrically connected with the three-phase control circuit, and the three groups of half-bridge series inverter main circuits are electrically connected with the other control circuit;
the excitation control circuit is used for generating source pulses, and the operation regulation function of the whole system is completed by the excitation control circuit;
the three-phase control circuit adopts a pulse phase-shifting mode to obtain inversion trigger pulses with different phases;
the output current of the three groups of half-bridge series inversion main circuits is connected with the induction coil of the heating furnace;
the three-phase control circuit comprises a trigger pulse phase-shifting circuit, a phase sequence switching circuit, a trigger pulse forming circuit and an overcurrent and overvoltage protection circuit, wherein the trigger pulse phase-shifting circuit and the phase sequence switching circuit are electrically connected with each other, the trigger control circuit is electrically connected with the phase sequence switching circuit, the phase sequence switching circuit is electrically connected with the trigger pulse forming circuit, and the trigger pulse forming circuit and the overcurrent and overvoltage protection circuit are electrically connected with three groups of half-bridge series inversion main circuits.
2. The three-phase intermediate frequency power supply circuit with adjustable phase shift angle of claim 1, characterized in that: the three groups of half-bridge series inversion main circuits comprise three groups of inversion bridge circuits, and each inversion bridge circuit comprises a filter capacitor C1, a resonance capacitor C2, an inversion bridge element SCR1, an inversion bridge element SCR2, a direct current sensor LF1, an intermediate frequency current transformer LF2 and an intermediate frequency voltage transformer YF 1;
the filter capacitor C1, the resonance capacitor C2, the inverter bridge element SCR1 and the inverter bridge element SCR2 form a series inverter circuit in a half-bridge structure;
the direct current sensor LF1, the intermediate frequency current transformer LF2 and the intermediate frequency voltage transformer YF1 are circuit parameter detecting elements for feedback control of the circuit.
3. The three-phase intermediate frequency power supply circuit with adjustable phase shift angle of claim 2, characterized in that: the three groups of inverter bridge circuits work at the same frequency, the phase difference is adjustable, and the phase sequence is switchable.
4. A three-phase if power supply circuit with adjustable phase shift angle according to claim 3, wherein: the control circuit comprises a DC current regulator, an intermediate frequency parameter regulator, a voltage-controlled oscillator, a trigger pulse forming circuit and a DC overcurrent protection circuit, wherein a feedback signal of the control circuit is used for controlling the circuit to regulate and protect the operation parameters of the inverter bridge, and the trigger pulse of the inverter bridge operates according to the mode of the control circuit.
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| CN202111292504.1A CN113890404B (en) | 2021-11-03 | 2021-11-03 | Three-phase intermediate frequency power supply circuit with adjustable phase shift angle |
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| CN202111292504.1A CN113890404B (en) | 2021-11-03 | 2021-11-03 | Three-phase intermediate frequency power supply circuit with adjustable phase shift angle |
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| CN113890404A true CN113890404A (en) | 2022-01-04 |
| CN113890404B CN113890404B (en) | 2024-04-12 |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1736012A1 (en) * | 1990-01-30 | 1992-05-23 | А.Н.Дубовец и В.М.Дубовец | Automatic regulator of induction furnace phase angle |
| US5165049A (en) * | 1990-04-02 | 1992-11-17 | Inductotherm Corp. | Phase difference control circuit for induction furnace power supply |
| CN1092217A (en) * | 1993-03-08 | 1994-09-14 | 山东工业大学 | Three-phase full-controlled trigger bridge circuit for thyristors |
| JP2006038351A (en) * | 2004-07-28 | 2006-02-09 | Kitashiba Electric Co Ltd | Induction melting furnace |
| JP2006082114A (en) * | 2004-09-16 | 2006-03-30 | Sansha Electric Mfg Co Ltd | Apparatus for melting casting metal |
| DE102007051666A1 (en) * | 2007-10-26 | 2009-04-30 | Otto Junker Gmbh | Power supply device for coreless induction furnace, has induction coils controlled in phase-in and phase-shift manner, where coils are connected in parallel by mechanically operatable contactors and by switches during in-phase operation |
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-
2021
- 2021-11-03 CN CN202111292504.1A patent/CN113890404B/en active Active
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