CN105763073B - A kind of mid-frequency melting furnace IGBT variable-frequency power sources - Google Patents
A kind of mid-frequency melting furnace IGBT variable-frequency power sources Download PDFInfo
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- CN105763073B CN105763073B CN201610325081.1A CN201610325081A CN105763073B CN 105763073 B CN105763073 B CN 105763073B CN 201610325081 A CN201610325081 A CN 201610325081A CN 105763073 B CN105763073 B CN 105763073B
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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
- 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
- H02M5/453—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 triode or transistor type requiring continuous application of a control signal
- H02M5/458—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 triode or transistor type requiring continuous application of a control signal 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
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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Abstract
The present invention relates to a kind of mid-frequency melting furnace IGBT variable-frequency power sources, including power supply cabinet, diode rectifier bridge, filter capacitor, IGBT module, induction coil and resonant capacitance；In power supply cabinet, filter capacitor, water cooling box, IGBT module, connecting copper bar summation current transformer integrated installation are formed into construction unit entity in a square box；Filter capacitor is located in the open space above box partition, and the water cooling box for installing IGBT module is located in the open space below dividing plate, and commonly connected copper bar is fixed in the dielectric support block of casing top；IGBT module and filter capacitor are at least made up of more than two entities；The uniform and consistent current that the present invention makes to flow through IGBT device by optimize technique layout, improves the capacity utilization of IGBT module and the operation power of IGBT module induction heating power；The application of IGBT module induction heating technique has been widened, the energy-saving and environmental protection advantage of IGBT module induction heating equipment is further played.
Description
Technical field
The present invention relates to a kind of mid-frequency melting furnace IGBT variable-frequency power sources, and it is a kind of IGBT changes in sensing heating field
Frequency power, it is a kind of mid-frequency melting furnace IGBT sensing heating variable-frequency power sources with energy-saving and environmental protection effect.
Background technology
Compared with traditional controllable silicon sensing heating variable-frequency power sources, there is IGBT sensing heating variable-frequency power sources energy-saving effect to show
The advantages that writing, be small to mains by harmonics interference, but from the point of view of the existing situation in market, the actual motion power of IGBT power supplys is significantly less than
Thyristor supply, the application to IGBT induction heating techniques bring larger limitation.
The content of the invention
It is an object of the invention to overcome drawbacks described above, there is provided a kind of high-power mid-frequency melting furnace IGBT variable-frequency power sources,
Positive role is played to widen the application of IGBT induction heating techniques, also plays positive work for user's production cost is greatly reduced
With.The power supply can not only do the supporting power supply of mid-frequency melting furnace, can also do the supporting power supply of other induction heaters, equally have
Energy-efficient effect.
Technical scheme：A kind of mid-frequency melting furnace IGBT variable-frequency power sources, including variable-frequency power sources rack, two poles
Pipe rectifier bridge, filter capacitor, IGBT module, induction coil, upper resonant capacitance and lower resonant capacitance, it is characterised in that the frequency conversion
One or more is provided with power supply cabinet to be made up of filter capacitor, water cooling box, IGBT module, connecting copper bar summation current transformer
Construction unit, wherein, connecting copper bar by public copper bar and output copper bar form, filter capacitor, water in each construction unit
Cooling box, IGBT module, connecting copper bar, current transformer are installed on same square box, and form a structure list
First entity, just can be together with the filter capacitor of the unit, water cooling box, IGBT module, connection copper as long as moving square box
Row, current transformer are moved together；
The square box be one with square structure casing penetrating before and after horizontal baffle, horizontal baffle is by square box
Body inner space is separated into two front and rear open spaces up and down, and square box bottom front face position, which is provided with, to be used to install water cooling
The bar shaped location-plate of box, square box upper surface both sides are respectively provided with the dielectric support block for installing commonly connected copper bar；
The filter capacitor is arranged on above square box dividing plate and is arranged on square box by membrane support, i.e. filter capacitor
On body in open space；The filter capacitor is at least made up of more than two entity capacitances, the number of each entity capacitance terminals
Measure as 2~10, electric capacity terminals are the structure that is arranged above and below, and face front and stretch out square box front end face；
The water cooling box is the rectangle box for leading to cooling water in one, and water cooling box transverse horizontal is placed on square box
Bar shaped location-plate is provided with bottom plate and by backplanes support, square box bottom plate, water cooling box is positioned at by the bar shaped location-plate
Square box bottom plate relevant position, i.e. water cooling box are placed under square box in open space；
The IGBT module is at least made up of more than two entity IGBT modules, and two are provided with each entity IGBT module
Adopt and be connected serially between individual unit IGBT, unit IGBT, i.e., each entity IGBT module has the master of three groups of different potentials
Electrode, be connected with cathode rectifier be positive pole, be connected with rectifier bridge negative pole to make negative pole, unit IGBT be connected in series extremely defeated
Go out pole, the quantity of main electrode terminals by IGBT module watt level can be set to one, two or more, single entity IGBT moulds
Block is arranged vertically, and down, multiple entity IGBT modules are transversely arranged for output stage, is close on the vertical plane of water cooling box front end and is pacified
Dress；
The side elevation view of two pieces of public copper bars is 7 character form structures, i.e., two piece of 7 public copper bar of font is set back-to-back,
Mirror position relation is formed, insulation board is provided between two pieces of public copper bars；Public copper bar and insulation board are stacked by insulated bolt
Together；In above-mentioned two pieces of public copper bars, one piece is positive pole copper bar, and another piece is negative pole copper bar；Positive pole copper bar vertical plane will be filtered
Multiple positive terminal terminations of ripple electric capacity and IGBT module connect together, and positive pole copper bar horizontal plane is what is be connected with cathode rectifier
Connect plane；Negative pole copper bar vertical plane connects together multiple negative terminal terminations of filter capacitor and IGBT module, negative pole copper
Drainage plane is the connection plane being connected with rectifier bridge negative pole；That piece of copper bar does positive pole copper bar, and that piece of copper bar does negative pole copper
Row, depending on IGBT actual conditions.
The horizontal plane position of the public copper bar is fixed in dielectric support block, i.e., two to be stacked together by insulated bolt
The public copper bar of block and insulation board are supported and fixed by dielectric support block, copper bar is insulated with casing；
The output copper bar is the independent connection copper bar provided with current transformer, i.e., each IGBT module is with one block of output copper
Row and a current transformer, there are several IGBT module entities just with several pieces of output copper bars and several current transformers, each piece
One end of output copper bar is connected with IGBT module output end, and the other end is provided with multiple connecting holes separated by a distance, passes through choosing
The actual connecting length of output copper bar can be changed by selecting the connecting hole of diverse location, i.e., the length of each piece output copper bar can be adjusted independently
Section, by adjusting the outputting inductance for each IGBT module of adjustable in length for exporting copper bar, so as to play uniform IGBT electric currents
Effect；Output copper bar is connected with induction coil；
The physical quantities of the construction unit are settable one, two or more, wherein, when the physical quantities of construction unit
For it is two or more when, connected using parallel way between each construction unit, i.e., the positive pole copper bar of each construction unit and rectification
The positive pole of bridge is connected, negative pole copper bar is connected with the negative pole of rectifier bridge, exports copper bar is connected with induction coil.
The entity capacitance of the filter capacitor is using horizontally disposed, i.e., the terminals of filter capacitor are horizontally arranged structure,
Herein under horizontally disposed pattern, the dividing plate top position on the inside of square box biside plate set respectively highly consistent, quantity with
Entity capacitance identical open slot, it is horizontal fixed in entity capacitance insertion groove.
The relative position between filter capacitor, IGBT module and connecting copper bar in the construction unit is constant, will be square
Casing rotates 180 ° together with filter capacitor, IGBT module and connecting copper bar, or turns clockwise 90 °, or 90 ° of rotate counterclockwise,
Installation or fixed form do corresponding adjustment.
The construction unit is not only adapted to half-bridge inversion circuit, full bridge inverter is also suitable for, in half-bridge inversion circuit
Using 1 equivalent structure unit, 2 equivalent structure units are used in full bridge inverter.
Improve the equal properties of flow of IGBT module in inverter circuit by improving assembly technology, make to flow through each IGBT module
Electric current it is as far as possible consistent.Its way is to form the filter capacitor in power supply and IGBT module integrated installation in square box
One construction unit entity, i.e., filter capacitor and IGBT module part are made into unitization structure, i.e., variable-frequency power sources is by multiple knots
Structure element entity forms, each element entity by several IGBT module devices, several filter capacitors, with its they between
Connecting copper bar forms, and system carries out Real-time Monitor Management to each solid element；By optimizing structure and adjusting each
The length of the output copper bar of IGBT module is to improve the uniformity of IGBT module electric current, it is ensured that IGBT power goods are run；Can root
According to power supply operation watt level increase and decrease solid element quantity.
Above-mentioned assembly technology has stepless action to the electric current for flowing through each IGBT module, and the capacity for improving module utilizes
Rate, while also optimize power supply process layout, mention positive role to improve the operation power of IGBT induction heating powers.
Brief description of the drawings
Fig. 1, the basic principle schematic for the present invention（Half bridge series resonance inverter circuit）；
Fig. 2, the basic principle schematic for the present invention（Full-bridge series resonance inverter circuit）；
Fig. 3, the principle of equal effects schematic diagram for the present invention；
Fig. 4, more construction unit principle of equal effects schematic diagrames for the present invention；
Fig. 5, the schematic cross-sectional view for the present invention；
Fig. 6, the dimensional structure diagram after internal connecting copper bar is removed for the present invention（The perpendicular dress of electric capacity）；
Fig. 7, it is structural upright schematic diagram of the present invention；
Fig. 8, the dimensional structure diagram after internal connecting copper bar is removed for the present invention（The horizontal dress of electric capacity）；
In figure：1- rectifier bridges；2- filter capacitors；3-IGBT modules；4- induction coils；The upper resonant capacitances of 5-；Resonance under 6-
Electric capacity；7- square box；8- dielectric support blocks；Public copper bar in 9-；10- insulation boards；Public copper bar outside 11-；12- exports copper
Row；1201- connecting holes；13- current transformers；14- bar shaped location-plates；15- water cooling boxes；100- construction units.
Embodiment
With reference to above-mentioned accompanying drawing：In Fig. 1, by 1 equivalent structure unit 100, induction coil 4, upper resonant capacitance 5, under it is humorous
The electric capacity 6 that shakes forms half bridge series resonance inverter circuit；In fig. 2, by 2 equivalent structure units 100 and induction coil, resonance
Capacitance group is into full-bridge series-resonant inverting circuit.
A kind of mid-frequency melting furnace IGBT variable-frequency power sources, including variable-frequency power sources rack, diode rectifier bridge 1, filter capacitor
2nd, IGBT module 3, induction coil 4, upper resonant capacitance 5 and lower resonant capacitance 6, it is characterised in that：
It is provided with the variable-frequency power sources rack one or more by filter capacitor 2, water cooling box 15, IGBT module 3, connection
The construction unit 100 that copper bar summation current transformer 13 forms, wherein, connecting copper bar is by interior public copper bar 9, the outer public and of copper bar 11
Output copper bar 12 forms, and filter capacitor 2, water cooling box 15, IGBT module 3, connecting copper bar, the electric current in each construction unit are mutual
Sensor 13 is installed on same square box 7, and forms a construction unit entity, as long as moving square box 7, just
It can be moved together with the filter capacitor 2 of the unit, water cooling box 15, IGBT module 3, connecting copper bar, current transformer 13；
The square box 7 will be square with square structure casing penetrating before and after horizontal baffle, horizontal baffle for one
The inner space of casing 7 is separated into two front and rear open spaces up and down, and the bottom front face position of square box 7, which is provided with, to be used to install water
The bar shaped location-plate 14 of cooling box 15, the upper surface both sides of square box 7 are respectively provided with the insulation branch of public copper bar 9 in installation
Bracer 8；
The filter capacitor 2 is arranged on above the dividing plate of square box 7 and by membrane support, the i.e. side of being arranged on of filter capacitor 2
On shape casing 7 in open space；The filter capacitor 2 is at least made up of more than two entity capacitances, each entity capacitance wiring
The quantity at end is 2~10, and electric capacity terminals are the structure that is arranged above and below, and faces front and stretch out the front end face of square box 7；
The water cooling box 15 is the rectangle box for leading to cooling water in one, and the transverse horizontal of water cooling box 15 is placed on square
On the bottom plate of casing 7 and by backplanes support, the bottom plate of square box 7 is provided with bar shaped location-plate 14, and the bar shaped location-plate 14 is by water cooling
But box 15 is positioned at the bottom plate relevant position of square box 7, i.e. water cooling box 15 is placed in 7 times open spaces of square box；
The IGBT module 3 is at least made up of more than two entity IGBT modules, is provided with each entity IGBT module
Adopt and be connected serially between two unit IGBT, unit IGBT, i.e., each entity IGBT module there are three groups of different potentials
Main electrode, be connected with cathode rectifier be positive pole, be connected with rectifier bridge negative pole make negative pole, unit IGBT be connected in series extremely
Output stage, the quantity of main electrode terminals can be set to 1,2 or multiple by IGBT module watt level；Single entity IGBT moulds
Block is arranged vertically, and down, multiple entity IGBT modules are transversely arranged for output stage, is close on the vertical plane of water cooling box front end and is pacified
Dress；
The connecting copper bar is made up of interior public copper bar 9, outer public copper bar 11 and output copper bar 12；Wherein, interior public copper
The side elevation view of row 9 and outer public copper bar 11 is 7 character form structures, i.e., public copper bar 11 outside the public font of copper bar 9 and 7 in 7 fonts
Set back-to-back, form mirror position relation, insulation board 10 is provided between interior public copper bar 9 and outer public copper bar 11；It is interior public
Copper bar 9, outer public copper bar 11 and insulation board 10 are stacked together by insulated bolt；In above-mentioned two pieces of public copper bars, one piece is
Positive pole copper bar, another piece is negative pole copper bar；Positive pole copper bar vertical plane is by filter capacitor 2 and multiple positive terminals of IGBT module 3
Termination connects together, and positive pole copper bar horizontal plane is the connection plane being connected with cathode rectifier；Negative pole copper bar vertical plane will filter
Multiple negative terminal terminations of electric capacity 2 and IGBT module 3 connect together, and negative pole copper bar horizontal plane is what is be connected with rectifier bridge negative pole
Connect plane；That piece of copper bar does positive pole copper bar, and that piece of copper bar does negative pole copper bar, depending on the actual conditions of IGBT module；
The horizontal plane position of the interior public copper bar 9 is fixed in dielectric support block 8, i.e., is stacked together by insulated bolt
Interior public copper bar 9, outer public copper bar 11 and insulation board 10 supported by dielectric support block 8 and fixed；Copper bar is set to be insulated with casing；
The output copper bar 12 is the independent connection copper bar provided with current transformer 13, i.e., each IGB T modules part matches somebody with somebody one
Block exports copper bar 12 and a current transformer 13, has several IGBT module entities just mutual with several pieces of output copper bars and several electric currents
Sensor, one end of each piece of output copper bar are connected with IGBT module output end, and the other end is provided with multiple companies separated by a distance
Hole 1201 is connect, by selecting the connecting hole of diverse location to change the actual connecting length of output copper bar, i.e., each block output copper
The length of row 12 can be separately adjustable, by adjusting the outputting inductance for each IGBT module of adjustable in length for exporting copper bar, so as to
Play a part of uniform IGBT electric currents；Output copper bar 12 is connected with induction coil 4；
The physical quantities of the construction unit 100 are settable one, two or more, wherein, when the reality of construction unit 100
When body quantity is two or more, connected between each construction unit 100 using parallel way, i.e., each construction unit 100 is just
Pole copper bar is connected with the positive pole of rectifier bridge 1, negative pole copper bar is connected with the negative pole of rectifier bridge 1, exports copper bar 12 and the phase of induction coil 4
Even.
The entity capacitance of the filter capacitor 2 is using horizontally disposed, i.e., the terminals of filter capacitor 2 are horizontally arranged knot
Structure, herein under horizontally disposed pattern, the dividing plate top position on the inside of the biside plate of square box 7 sets highly consistent, number respectively
Amount and entity capacitance identical open slot, it is horizontal fixed in entity capacitance insertion groove.
The relative position between filter capacitor 2, IGBT module 3 and connecting copper bar in the construction unit 100 is constant, will
Square box 7 rotates 180 ° together with filter capacitor 2, IGBT module 3 and connecting copper bar, or turns clockwise 90 °, or rotation counterclockwise
Turn 90 °, installation or fixed form do corresponding adjustment.
The construction unit 100 is not only adapted to half-bridge inversion circuit, full bridge inverter is also suitable for, in half-bridge inversion circuit
It is middle to use 1 equivalent structure unit 100 (referring to Fig. 1), using 2 equivalent structure units 100 (ginseng in full bridge inverter
See Fig. 2).
Above-mentioned assembly technology exports the effective length of copper bar 12 by the electric current and regulation that detect current transformer 13, makes stream
The uniform and consistent current of IGBT module 3 is crossed, improves the capacity utilization of module, while also optimizes power supply process layout, to carry
The operation power of high IGBT module induction heating power mentions positive role.
Claims (3)
1. a kind of mid-frequency melting furnace IGBT variable-frequency power sources, including variable-frequency power sources rack, diode rectifier bridge（1）, filter capacitor
（2）, IGBT module（3）, induction coil（4）, upper resonant capacitance（5）With lower resonant capacitance（6）, it is characterised in that：
A, one or more is provided with the variable-frequency power sources rack by filter capacitor（2）, water cooling box（15）, IGBT module（3）、
Connecting copper bar summation current transformer（13）The construction unit of composition（100）, wherein, connecting copper bar is by interior public copper bar（9）, granddad
Copper bar altogether（11）With output copper bar（12）Composition；Each construction unit（100）In filter capacitor（2）, water cooling box（15）、
IGBT module（3）, connecting copper bar, current transformer（13）It is installed in same square box（7）On, and form a structure
Element entity；
B, the square box（7）Will be square with square structure casing penetrating before and after horizontal baffle, horizontal baffle for one
Casing（7）Inner space is separated into two front and rear open spaces up and down, square box（7）Bottom front face position, which is provided with, to be used to pacify
Fill water cooling box（15）Bar shaped location-plate（14）, square box（7）Upper surface both sides are respectively provided with public copper in installation
Row（9）Dielectric support block（8）；
C, the filter capacitor（2）It is arranged on square box（7）Above dividing plate and by membrane support, i.e. filter capacitor（2）Set
In square box（7）In upper open space；The filter capacitor（2）At least it is made up of more than two entity capacitances, each entity
The quantity of electric capacity terminals is 2~10, and electric capacity terminals are the structure that is arranged above and below, and faces front and stretch out square box
(7) front end face；
D, the water cooling box（15）To lead to the rectangle box of cooling water, water cooling box in one（15）The transverse horizontal side of being placed on
Shape casing（7）On bottom plate and by backplanes support, square box（7）Bottom plate front position is provided with bar shaped location-plate（14）, the bar shaped
Location-plate（14）By water cooling box（15）It is positioned at square box（7）Bottom plate relevant position, i.e. water cooling box（15）The side of being placed on
Shape casing（7）In lower open space；
The IGBT module（3）At least it is made up of more than two entity IGBT modules, single entity IGBT module is arranged vertically,
Down, multiple entity IGBT modules are transversely arranged for output stage, are close on the vertical plane of water cooling box front end and install；
E, the interior public copper bar（9）With outer public copper bar（11）Side elevation view be 7 character form structures, i.e., public copper in 7 fonts
Row（9）With public copper bar outside 7 fonts（11）Set back-to-back, form mirror position relation, interior public copper bar（9）With outer public copper
Row（11）Between be provided with insulation board（10）；Interior public copper bar（9）, outer public copper bar（11）And insulation board（10）Pass through insulated bolt
Stack together；In above-mentioned two pieces of public copper bars, one piece is positive pole copper bar, and another piece is negative pole copper bar；Positive pole copper bar vertical plane
By filter capacitor（2）And IGBT module（3）Multiple positive terminal terminations connect together, positive pole copper bar horizontal plane is and rectifier bridge
The connected connection plane of positive pole；Negative pole copper bar vertical plane is by filter capacitor（2）And IGBT module（3）Multiple negative terminal terminations
Connect together, negative pole copper bar horizontal plane is the connection plane being connected with rectifier bridge negative pole；
The interior public copper bar（9）Horizontal plane position be fixed on dielectric support block（8）On, i.e., stacked together by insulated bolt
Interior public copper bar（9）, outer public copper bar（11）And insulation board（10）By dielectric support block（8）Support and fix
The output copper bar（12）For provided with current transformer（13）Independent connection copper bar, i.e., each IGBT module with one piece it is defeated
Go out copper bar（12）With a current transformer（13）, one end of each piece of output copper bar is connected with IGBT module output end, another
End is provided with multiple connecting holes separated by a distance（1201）, i.e., each piece output copper bar（12）Length can be separately adjustable；It is defeated
Go out copper bar（12）With induction coil（4）It is connected；
F, the construction unit（100）Physical quantities set one, it is two or more, wherein, work as construction unit（100）Reality
When body quantity is two or more, each construction unit（100）Between using parallel way connect, i.e., each construction unit（100）
Positive pole copper bar and rectifier bridge（1）Positive pole be connected, negative pole copper bar and rectifier bridge（1）Negative pole be connected, output copper bar（12）With
Induction coil（4）It is connected.
A kind of 2. mid-frequency melting furnace IGBT variable-frequency power sources as claimed in claim 1, it is characterised in that the filter capacitor（2）
Entity capacitance using horizontally disposed, i.e. filter capacitor（2）Terminals be horizontally arranged structure, in square box（7）Both sides
Dividing plate top position on the inside of plate sets highly consistent, quantity and entity capacitance identical open slot, entity capacitance insertion respectively
It is horizontal fixed in groove.
A kind of 3. mid-frequency melting furnace IGBT variable-frequency power sources as claimed in claim 1, it is characterised in that the construction unit
（100）In filter capacitor（2）, IGBT module（3）Relative position between connecting copper bar is constant, by square box（7）Even
Same filter capacitor（2）, IGBT module（3）180 ° are rotated with connecting copper bar, or is turned clockwise 90 °, or 90 ° of rotate counterclockwise,
Installation or fixed form do corresponding adjustment.
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| CN201610325081.1A CN105763073B (en) | 2016-05-17 | 2016-05-17 | A kind of mid-frequency melting furnace IGBT variable-frequency power sources |
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| CN201610325081.1A CN105763073B (en) | 2016-05-17 | 2016-05-17 | A kind of mid-frequency melting furnace IGBT variable-frequency power sources |
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| CN105763073B true CN105763073B (en) | 2018-03-16 |
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| CN107785925A (en) * | 2016-08-30 | 2018-03-09 | 天津瑞能电气有限公司 | A kind of mounting structure of wind-power electricity generation frequency conversion device ripple resistance and electric capacity |
| CN112510000B (en) * | 2020-11-17 | 2024-04-09 | 扬州国扬电子有限公司 | Power module with low parasitic inductance of driving loop |
| CN114160942B (en) * | 2021-11-11 | 2023-02-28 | 安徽理士电源技术有限公司 | Welding system for lead-acid storage battery through-wall welding |
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| CN203193517U (en) * | 2013-02-26 | 2013-09-11 | 山东艾诺仪器有限公司 | Inverter power module structure of insulated gate bipolar transistor (IGBT) |
| CN103401434B (en) * | 2013-06-21 | 2015-09-23 | 国家电网公司 | A kind of power unit of large-power current transformer |
| CN105450037A (en) * | 2015-12-29 | 2016-03-30 | 无锡应达工业有限公司 | Intermediate frequency power supply heating system |
| CN205657596U (en) * | 2016-05-17 | 2016-10-19 | 株洲弗拉德科技有限公司 | Energy -saving intermediate frequency furnace IGBT variable frequency power supply for stove |
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