CN105553243A - Symmetric capacitor plate and three-phase frequency converter - Google Patents
Symmetric capacitor plate and three-phase frequency converter Download PDFInfo
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- CN105553243A CN105553243A CN201510971173.2A CN201510971173A CN105553243A CN 105553243 A CN105553243 A CN 105553243A CN 201510971173 A CN201510971173 A CN 201510971173A CN 105553243 A CN105553243 A CN 105553243A
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- capacitor board
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides a symmetric capacitor plate and a three-phase frequency converter. The symmetric capacitor plate comprises a DC bus capacitor, a filtering capacitor and conductive interfaces, wherein the DC bus capacitor is used for absorbing peak voltage in power voltage, the filtering capacitor and the DC bus capacitor are arranged in parallel, the filtering capacitor is used for filtering high-frequency ripple in the power voltage, the conductive interfaces are respectively and electrically connected with the DC bus capacitor and the filtering capacitor, each group of conductive interface comprises a positive electrode interface and a negative electrode interface, and the conductive interfaces are used for connecting a DC power supply bus and a power switching device module and making a plurality of symmetric capacitor plates connected in parallel. Compared with the situation that the maintenance cost is greatly increased when a capacitor of the three-phase frequency converter in the prior art is damaged, the symmetric capacitor plate has the advantages that the a worker only needs to replace the corresponding symmetric capacitor plate when the three-phase frequency converter cannot work due to part (namely capacitor) damage on the symmetric capacitor plate, the symmetric capacitor plate is convenient to install, the maintenance step of the worker is simplified, the maintenance efficiency is improved, and the symmetric capacitor plate has high promotion.
Description
Technical field
The present invention relates to electronic circuit field, in particular to symmetrical expression capacitor board and three phase converter.
Background technology
Three phase converter is threephase motor large power inverter power source, is mainly used in the torque accurately controlling threephase motor, rotating speed and attitude; It is primarily of MOSFET or IGBT; Form main switching circuit, the signal using microcontroller to send is modulated heavy current signal, reaches the object of control objectives motor electromagnetic characteristic, is the crystallization of power semiconductor device development.
Correlation technique provides a kind of three phase converter, and it comprises multiple electric capacity, microcontroller (single-chip microcomputer, DSP, CPU etc.), and large-scale IGBT or switch mosfet parts, wait parts; Wherein on DC bus, main carrying absorbs the switch Absorption Capacitance and high power switch original paper that cause in loud-break switch element switch process, or even the weak electric signal part hybrid integrated such as microcontroller is on the circuit board of three phase converter, and electric capacity is under the state of overheated or high temperature, its life-span can reduce greatly, and as under the environment of 50 DEG C, the life-span of electric capacity is more than 10000 hours, but under the hot environment of 85 DEG C, the life-span of electric capacity is reduced to 2000 hours; Above-mentioned electric capacity, because extremely difficult replacing, is usually taked redundancy to arrange, is namely taked the necessary electric capacity quantity exceeding several times to install on frequency converter, if there is the electric capacity damaging inefficacy to occur, so continuation is kept function by other remaining electric capacity.If capacitance damage quantity to a certain extent, so itself maintenance cost can only be considerably increased by integral replacing frequency converter.
Inventor finds under study for action, all integratedly with other elements due to electric capacity multiple in existing three phase converter is made in a printed circuit board, when capacitance damage, increases maintenance cost.For this problem, at present effective settling mode is not yet proposed.
Summary of the invention
The object of the present invention is to provide a kind of symmetrical expression capacitor board and three phase converter, change to facilitate user, increase electric capacity, the electric capacity etc. reduced in three phase converter is directly parallel in maintenance difficulty and the cost of the components and parts group on transmission large power, electrically signal line.
First aspect, embodiments provides a kind of symmetrical expression capacitor board, comprising: dc-link capacitance, filter capacitor and at least one group of conductive interface;
Described dc-link capacitance, for absorbing the peak voltage in supply voltage;
Described filter capacitor and described dc-link capacitance are arranged in parallel, for the high frequency ripple of supply voltage described in filtering;
Described conductive interface is electrically connected with described dc-link capacitance and filter capacitor respectively; Often organize described conductive interface and include an anode interface and a negative pole interface; Multiple described symmetrical expression capacitor board for connecting DC power supply bus and device for power switching module, and is connected in parallel by described conductive interface.
In conjunction with first aspect, embodiments provide the first possible execution mode of first aspect, wherein, described symmetrical expression capacitor board also comprises: resistance and voltage stabilizing didoe.
Described resistance is connected in parallel with described dc-link capacitance and filter capacitor respectively, for providing discharge path for described dc-link capacitance and described filter capacitor;
Described voltage stabilizing didoe is connected in parallel with described dc-link capacitance and filter capacitor respectively, for exceeding the decompression protection of preset value to supply voltage.
In conjunction with the first possible execution mode of first aspect, embodiments provide the execution mode that the second of first aspect is possible, wherein, described symmetrical expression capacitor board also comprises conductive connecting element;
Each is organized on described conductive interface and is provided with described conductive connecting element, and described conductive connecting element is electrically connected with described DC power supply bus, for being connected in parallel by multiple symmetrically arranged described symmetrical expression capacitor board.
In conjunction with the execution mode that the second of first aspect is possible, embodiments provide the third possible execution mode of first aspect, wherein, described conductive connecting element is the metallic copper post of bearing great current, be provided with screw thread, for ensureing fastening setting between multiple symmetrical expression capacitor board.
In conjunction with the third possible execution mode of first aspect, embodiments provide the 4th kind of possible execution mode of first aspect, wherein, described conductive interface is many groups, and the described conductive interface of many groups is symmetrical arranged along the symmetry axis of described symmetrical expression capacitor board.
In conjunction with the 4th kind of possible execution mode of first aspect, embodiments provide the 5th kind of possible execution mode of first aspect, wherein, the center of described symmetrical expression capacitor board is set to higher-pressure region, the surrounding position of described symmetrical expression capacitor board is set to low-pressure area, and described higher-pressure region and described low-pressure area are provided with multiple via pad; Described via pad is welded with described dc-link capacitance; The electric current of described symmetrical expression capacitor board flows to the low-pressure area of described surrounding position from the higher-pressure region of described center.
In conjunction with the 5th kind of possible execution mode of first aspect, embodiments provide the 6th kind of possible execution mode of first aspect, wherein, described dc-link capacitance is multiple, and multiple described dc-link capacitance is symmetrical arranged along the symmetry axis of described symmetrical expression capacitor board.
In conjunction with the first possible execution mode of first aspect, first aspect to any one possible execution mode in the 6th kind of possible execution mode of first aspect, embodiments provide the 7th kind of possible execution mode of first aspect, wherein, described symmetrical expression capacitor board is rectangle, and the corner location of rectangular capacitive plate is respectively arranged with conductive interface described in a group; The described conductive interface of described corner location is symmetrical arranged between two along the symmetry axis of described rectangular capacitive plate.
In conjunction with first aspect, embodiments provide the 8th kind of possible execution mode of first aspect, wherein, described resistance is multiple, and multiple described resistant series connects.
Second aspect, the embodiment of the present invention additionally provides a kind of three phase converter, comprising: the symmetrical expression capacitor board described in above-mentioned first aspect any one; Described three phase converter also comprises micro controller module and device for power switching module;
Described symmetrical expression capacitor board comprises conductive connecting element, and described conductive connecting element is electrically connected with DC power supply bus, and is electrically connected with described device for power switching module by described power source bus electrical connection; Described device for power switching module is used for being electrically connected with control motor;
Described micro controller module is electrically connected with described device for power switching module, for controlling described device for power switching module work.
A kind of symmetrical expression capacitor board that the embodiment of the present invention provides and three phase converter, comprising: dc-link capacitance, for absorbing the peak voltage in supply voltage, filter capacitor and dc-link capacitance are arranged in parallel, for the high frequency ripple of filter out power voltage, conductive interface is electrically connected with dc-link capacitance and filter capacitor respectively, often organize conductive interface and include an anode interface and a negative pole interface, conductive interface is for connecting DC power supply bus and device for power switching module, and multiple symmetrical expression capacitor board is connected in parallel, all integratedly with other elements with electric capacity multiple in three phase converter of the prior art be made in a printed circuit board, when capacitance damage, increase maintenance cost to compare, its parts (i.e. electric capacity) on symmetrical expression capacitor board damage and cause three phase converter to work, staff is only needed to change this corresponding symmetrical expression capacitor board, convenient installation, simplify the maintenance step of staff, improve maintenance efficiency, have can be strong generalization.
For making above-mentioned purpose of the present invention, feature and advantage become apparent, preferred embodiment cited below particularly, and coordinate appended accompanying drawing, be described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, be to be understood that, the following drawings illustrate only some embodiment of the present invention, therefore the restriction to scope should be counted as, for those of ordinary skill in the art, under the prerequisite not paying creative work, other relevant accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 shows the structural representation of a kind of symmetrical expression capacitor board front installing component that the embodiment of the present invention provides;
Fig. 2 shows the structural representation of the non-installing component in a kind of symmetrical expression capacitor board front that the embodiment of the present invention provides;
The front that Fig. 3 shows a kind of symmetrical expression capacitor board that the embodiment of the present invention provides is divided into the structural representation of higher-pressure region and low-pressure area;
Fig. 4 shows the structural representation of a kind of three phase converter that the embodiment of the present invention provides.
Major components illustrates: 11, dc-link capacitance; 12, filter capacitor; 13, conductive interface; 14, voltage stabilizing didoe; 15, resistance; 17, higher-pressure region; 18, low-pressure area; 19, via pad; 1, symmetrical expression capacitor board; 2, device for power switching module; 3, micro controller module; 4, motor is controlled.
Embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.The assembly of the embodiment of the present invention describing and illustrate in usual accompanying drawing herein can be arranged with various different configuration and design.Therefore, below to the detailed description of the embodiments of the invention provided in the accompanying drawings and the claimed scope of the present invention of not intended to be limiting, but selected embodiment of the present invention is only represented.Based on embodiments of the invention, the every other embodiment that those skilled in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
The large-sized DC bus capacitor 11 considering in prior art in three phase converter be all with the forceful electric power such as pyrotoxin and microcontroller such as power switch pipe components and parts and light current unit on one piece of compact circuit board, when damage being impacted to DC power supply bus when Cheng Load input power pipe switches such as electric capacity, increase the problem of the maintenance difficulty of staff, embodiments provide a kind of symmetrical expression capacitor board, electric capacity etc. easily loss and be that parts directly in parallel with direct current voltage bus are independent from frequency converter, , it is when these type of parts damages, staff is only needed to change this corresponding symmetrical expression capacitor board.Needing the demand to elements such as electric capacity of strengthening, when improving the load capacity of frequency converter, the mode of multiple plate An Installed simultaneously also can adopted to expand, symmetrical attribute, conveniently install, simplify the maintenance step of staff, improve maintenance efficiency, have can be strong generalization.
In addition, symmetrical expression capacitor board provided by the present invention can also be applied in other devices, and as inverter, Switching Power Supply etc., see Fig. 1-Fig. 4, are applied in symmetrical expression capacitor board in three phase converter below and are described.
With reference to the structural representation of the symmetrical expression capacitor board shown in figure 1 and Fig. 2, described symmetrical expression capacitor board comprises: dc-link capacitance 11, filter capacitor 12 and at least one group of conductive interface 13;
Described dc-link capacitance 11, for absorbing the peak voltage in supply voltage;
Described filter capacitor 12 is arranged in parallel, for the high frequency ripple of supply voltage described in filtering with described dc-link capacitance 11;
Described conductive interface 13 is electrically connected with described dc-link capacitance 11 and filter capacitor 12 respectively; Often organize described conductive interface 13 and include an anode interface and a negative pole interface; Multiple described symmetrical expression capacitor board for connecting DC power supply bus, and is connected in parallel by described conductive interface 13
A kind of symmetrical expression capacitor board that the embodiment of the present invention provides, all integratedly with other elements with electric capacity multiple in three phase converter of the prior art be made in a printed circuit board, when capacitance damage, increase maintenance cost to compare, its parts (i.e. electric capacity) on symmetrical expression capacitor board damage and cause three phase converter to work, staff is only needed to change this corresponding symmetrical expression capacitor board, conveniently install, simplify the maintenance step of staff, improve maintenance efficiency, have can be strong generalization.
Wherein, by the dc-link capacitance 11 in three phase converter, filter capacitor 12 is all arranged in a symmetrical expression capacitor board, then this symmetrical expression capacitor board is connected with other devices (as micro controller module 3 and device for power switching module 2) of three phase converter, like this when claiming the capacitance damage on formula capacitor board, staff can directly change symmetrical expression capacitor board, then staff can unify maintenance and repair to the symmetrical expression capacitor board changed, namely place under repair if can repair, can directly lose if cannot repair, the mode of direct better whole symmetrical expression capacitor board is convenient to be installed and changes, and simplifies the maintenance step of staff, improves maintenance efficiency.
Wherein, the effect of above-mentioned dc-link capacitance 11 absorbs the peak voltage in supply voltage, and protection inverter or frequency converter impact from electrical network instantaneous peak value.In addition, above-mentioned dc-link capacitance 11 also has following effect: (1) compensates the difference with supply frequency twice or six times of inverter power demands changed and rectifier bridge power output; (2) input current of inverter goods frequency converter switching frequency is provided; (3) current harmonics reducing switching frequency enters electrical network; (4) the motor degaussing energy under all device for power switching shutoffs when suddenly stopping state is absorbed; (5) Instantaneous peak power is provided;
And above-mentioned filter capacitor 12 is arranged in parallel with above-mentioned dc-link capacitance 11, namely above-mentioned dc-link capacitance 11 is electric capacity self-existent with filter capacitor 12, it is mainly used in the high frequency ripple of supply voltage described in filtering, namely filtering alternating component is used for, make the direct current of output more level and smooth, and itself and dc-link capacitance 11 are connected in parallel, for improving the working effect of filter capacitor 12.
And the symmetrical expression capacitor board comprising above-mentioned dc-link capacitance 11 and filter capacitor 12 is electrically connected with DC power supply bus and device for power switching module 2 by conductive interface 13, for receiving the power supply of DC power supply bus, and device for power switching module 2 is coordinated to carry out work.
In addition, above-mentioned conductive interface 13 of often organizing includes an anode interface and a negative pole interface; Above-mentioned anode interface and negative pole interface are connected positive pole and the negative pole of DC power supply bus respectively, and above-mentioned anode interface and negative pole interface are also connected positive pole and the negative pole of device for power switching module 2 respectively;
Consider the situation that electric capacity in three phase converter of the prior art is not enough, the process increasing electric capacity is also more complicated, needs staff to redeploy circuit, and to install the new electric capacity of increase, operating process is complicated and add the working strength of staff; To this, in the embodiment of the present invention, above-mentioned conductive interface 13 also has an effect to be connected in parallel by multiple described symmetrical expression capacitor board exactly, staff is facilitated to be connected in parallel by multiple symmetrical expression capacitor board, namely multiple dc-link capacitance 11 that is deployed with can be fixedly connected with the symmetrical expression capacitor board of filter capacitor 12 by this conductive interface 13, can realize increasing electric capacity, and simple and convenient by the mounting means of conductive interface 13, greatly facilitate the installment work of staff.
Preferably, all there are identical size and identical device layout (as identical with arranging of at least one group of conductive interface 13 in the dc-link capacitance 11 between each symmetrical expression capacitor board, filter capacitor 12 between above-mentioned multiple symmetrical expression capacitor board, can be understood as multiple symmetrical expression capacitor board to be symmetrical arranged), like this, staff is when installing multiple symmetrical expression capacitor board, only need aim at the conductive interface 13 between each capacitor board, then carry out connecting according to this conductive interface 13.
Consider that the supply voltage of DC power supply bus may exist the situation of instantaneous large-current and above-mentioned dc-link capacitance 11 and filter capacitor 12 after absorbing electric capacity, situation about also will discharge to the electric capacity absorbed, with reference to figure 1 and Fig. 2, the above-mentioned symmetrical expression capacitor board that the embodiment of the present invention provides also comprises: resistance 15 and voltage stabilizing didoe 14.
Resistance 15 is connected in parallel with dc-link capacitance 11 and filter capacitor 12 respectively, for providing discharge path for dc-link capacitance 11 and filter capacitor 12;
Voltage stabilizing didoe 14 is connected in parallel with dc-link capacitance 11 and filter capacitor 12 respectively, for exceeding the decompression protection of preset value to supply voltage.
Concrete; above-mentioned voltage stabilizing didoe 14 is connected in parallel with dc-link capacitance 11 and filter capacitor 12 respectively; object plays the effect of voltage stabilizing; the supply voltage that maintaining DC power supply bus provides does not exceed dangerous values; namely supply voltage is exceeded to the decompression protection of preset value, to ensure that supply voltage maintains in predeterminated voltage.
And above-mentioned resistance 15 is same and dc-link capacitance 11 and filter capacitor 12 are connected in parallel, object provides path when being and discharging to dc-link capacitance 11 and filter capacitor 12, in real work, dc-link capacitance 11 and filter capacitor 12 discharge when DC bus-bar voltage declines, and the object of absorption resistance 15 absorbs the electric discharge of dc-link capacitance 11 and filter capacitor 12 just, in order to promote the service behaviour of this symmetrical expression capacitor board.
Resistance 15 can keep correct at multiple above-mentioned symmetrical expression capacitor board easily when accessing frequency converter product and be coupled to each other relation, and the delivery of electrical energy path of excellent electric properties under being provided in high-voltage large current prerequisite.
Preferably, above-mentioned resistance 15 is multiple, and multiple resistance 15 is connected in series, and absorbs in order to the better electric discharge to dc-link capacitance 11 and filter capacitor 12, to ensure the normal work of symmetrical expression capacitor board.
Further, this symmetrical expression capacitor board also comprises conductive connecting element (not shown); Each group conductive interface 13 is provided with conductive connecting element, and conductive connecting element is electrically connected with DC power supply bus, for being connected in parallel by multiple symmetrically arranged symmetrical expression capacitor board.
Concrete, each conductive interface 13 is provided with above-mentioned conductive connecting element, and the object of this conductive connecting element is connected by multiple symmetrically arranged symmetrical expression capacitor board Components Parallel Connection.
Preferably, above-mentioned conductive connecting element is the metallic copper post of bearing great current, be provided with screw thread, for ensureing fastening setting between multiple symmetrical expression capacitor board, namely above-mentioned conductive connecting element is threaded and takes into account the metal column of the allowed bearing great current of fastening function between plate; Copper post is preferably in the embodiment of the present invention.
Further, consider the conduction of above-mentioned symmetrical expression capacitor board stability and, above-mentioned conductive interface 13 is many groups, and the described conductive interface 13 of many groups is symmetrical arranged along the symmetry axis of described symmetrical expression capacitor board.
Concrete, in the above-mentioned symmetrical expression capacitor board that the embodiment of the present invention provides, above-mentioned conductive interface 13 is many groups, and many group conductive interfaces 13 are symmetrical arranged along the symmetry axis of symmetrical expression capacitor board.
Concrete, in order to ensure the stability connected between conductivity between multiple symmetrical expression capacitor board and multiple symmetrical expression capacitor board, many group conductive interfaces 13 can be set; Preferably, be symmetrical arranged organizing the symmetry axis of conductive interface 13 along symmetrical expression capacitor board more, first stability when can ensure that multiple symmetrical expression capacitor board is installed further is symmetrical arranged, and conveniently arrange multiple symmetrical expression capacitor board to be symmetrical arranged simultaneously, so that the later stage when increasing electric capacity, only needs the symmetrical expression capacitor board increasing respective amount.
Further, with reference to figure 3, in this symmetrical expression capacitor board, the center of symmetrical expression capacitor board is set to higher-pressure region 17, and the surrounding position of symmetrical expression capacitor board is set to low-pressure area 18, and higher-pressure region 17 and low-pressure area 18 are provided with multiple via pad 19; Via pad 19 is welded with dc-link capacitance 11; The electric current of symmetrical expression capacitor board flows to the low-pressure area 18 of surrounding position from the higher-pressure region 17 of center.
Consider the fail safe that user uses, another core point of the present invention is then that the center of above-mentioned symmetrical expression capacitor board is set to higher-pressure region 17, the surrounding position of symmetrical expression capacitor board is set to low-pressure area 18, object is that the position that user may contact is set to low pressure, avoid user to get an electric shock, ensure that the fail safe that above-mentioned symmetrical expression capacitor board uses.
Wherein, above-mentioned multiple via pad 19 is for welding dc-link capacitance 11, and the effect of dc-link capacitance 11 absorbs the peak voltage in supply voltage, to ensure the normal work of three phase converter.
Further, with reference to figure 1-Fig. 3, in order to better absorb the peak voltage in supply voltage, to ensure the normal work of three phase converter, above-mentioned dc-link capacitance 11 is multiple, and multiple dc-link capacitance 11 is symmetrical arranged along the symmetry axis of symmetrical expression capacitor board.
Consider that a dc-link capacitance 11 cannot meet the structure in three-phase inversion device, the embodiment of the present invention arranges multiple dc-link capacitance 11 in above-mentioned symmetrical expression capacitor board, in order to better absorb the peak voltage in supply voltage; Preferred above-mentioned multiple dc-link capacitance 11 can be symmetrical arranged along the symmetry axis of symmetrical expression capacitor board equally, first can save the position of symmetrical expression capacitor board, can dispose other relevant devices.
It should be noted that, the number of above-mentioned dc-link capacitance 11 can be arranged as required, and the embodiment of the present invention does not do concrete restriction to its concrete numerical value.
Further, with reference to figure 1-Fig. 3, in this symmetrical expression capacitor board, symmetrical expression capacitor board is rectangle, and the corner location of rectangular capacitive plate is respectively arranged with one group of conductive interface 13; The conductive interface 13 of corner location is symmetrical arranged between two along the symmetry axis of rectangular capacitive plate.
Preferably, above-mentioned symmetrical expression capacitor board is set to rectangle, and the corner location of rectangular capacitive plate is respectively arranged with one group of conductive interface 13; The conductive interface 13 of corner location is symmetrical arranged between two with the symmetry axis of rectangular capacitive plate, object is in order to stability when multiple symmetrical expression capacitor board is installed, and conveniently arrange multiple symmetrical expression capacitor board to be symmetrical arranged simultaneously, so that the later stage when increasing electric capacity, only needs the symmetrical expression capacitor board increasing respective amount.
The symmetrical expression capacitor board that the embodiment of the present invention provides, has following features:
1) use welding resistance developing tank technique, maximum six electric capacity can be welded in every face.
2) positive and negative uses simultaneously and can weld maximum 12 electric capacity;
3) be blown into can have welding effect by the leg hot blast stopped;
4) integrated direct connects the device of DC bus in succession, in independent module;
5) morphological feature: symmetric design, outside with the encirclement of power cathode C ground connection;
6) center of inside has symmetrical higher-pressure region 17;
7) hexagonal copper post is used to connect, positive and negative time stacked, be correct parallel relationship.
A kind of three phase converter that the embodiment of the present invention also provides, with reference to figure 4, comprising: above-mentioned symmetrical expression capacitor board 1, also comprises micro controller module 3 and device for power switching module 2;
Above-mentioned symmetrical expression capacitor board 1 comprises conductive connecting element, and this conductive connecting element is electrically connected with DC power supply bus, and is electrically connected with device for power switching module 2 by power source bus; This device for power switching module 2 is for being electrically connected with control motor 4;
Above-mentioned micro controller module 3 is electrically connected with device for power switching module 2, works for controlling device for power switching module 2.
Concrete, above-mentioned symmetrical expression capacitor board 1 comprises conductive connecting element, this conductive connecting element is electrically connected with DC power supply bus (i.e. power supply), and by DC power supply bus and device for power switching module 2, and device for power switching module 2 itself is a part for three phase converter, it is electrically connected with control motor 4, by controlling motor 4 by power phase line for providing power with control device for power switching module 2, and this device for power switching module 2 is also electrically connected with micro controller module 3, for the control command work according to micro controller module 3.
A kind of three phase converter that the embodiment of the present invention provides, all integratedly with other elements with electric capacity multiple in three phase converter of the prior art be made in a printed circuit board, when capacitance damage, increase maintenance cost to compare, its parts (i.e. electric capacity) on symmetrical expression capacitor board 1 damage and cause three phase converter to work, staff is only needed to change this corresponding symmetrical expression capacitor board 1, conveniently install, simplify the maintenance step of staff, improve maintenance efficiency, have can be strong generalization.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (10)
1. a symmetrical expression capacitor board, is characterized in that, comprising: dc-link capacitance, filter capacitor and at least one group of conductive interface;
Described dc-link capacitance, for absorbing the peak voltage in supply voltage;
Described filter capacitor and described dc-link capacitance are arranged in parallel, for the high frequency ripple of supply voltage described in filtering;
Described conductive interface is electrically connected with described dc-link capacitance and filter capacitor respectively; Often organize described conductive interface and include an anode interface and a negative pole interface; Multiple described symmetrical expression capacitor board for connecting DC power supply bus and device for power switching module, and is connected in parallel by described conductive interface.
2. symmetrical expression capacitor board according to claim 1, is characterized in that, also comprise: resistance and voltage stabilizing didoe;
Described resistance is connected in parallel with described dc-link capacitance and filter capacitor respectively, for providing discharge path for described dc-link capacitance and described filter capacitor;
Described voltage stabilizing didoe is connected in parallel with described dc-link capacitance and filter capacitor respectively, for exceeding the decompression protection of preset value to supply voltage.
3. symmetrical expression capacitor board according to claim 2, is characterized in that, also comprise conductive connecting element;
Each is organized on described conductive interface and is provided with described conductive connecting element, and described conductive connecting element is electrically connected with described DC power supply bus, for being connected in parallel by multiple symmetrically arranged described symmetrical expression capacitor board.
4. symmetrical expression capacitor board according to claim 3, is characterized in that, described conductive connecting element is the metallic copper post of bearing great current, is provided with screw thread, for ensureing fastening setting between multiple symmetrical expression capacitor board.
5. symmetrical expression capacitor board according to claim 4, is characterized in that, described conductive interface is many groups, and the described conductive interface of many groups is symmetrical arranged along the symmetry axis of described symmetrical expression capacitor board.
6. symmetrical expression capacitor board according to claim 5, it is characterized in that, the center of described symmetrical expression capacitor board is set to higher-pressure region, and the surrounding position of described symmetrical expression capacitor board is set to low-pressure area, and described higher-pressure region and described low-pressure area are provided with multiple via pad; Described via pad is welded with described dc-link capacitance; The electric current of described symmetrical expression capacitor board flows to the low-pressure area of described surrounding position from the higher-pressure region of described center.
7. symmetrical expression capacitor board according to claim 6, is characterized in that, described dc-link capacitance is multiple, and multiple described dc-link capacitance is symmetrical arranged along the symmetry axis of described symmetrical expression capacitor board.
8. the symmetrical expression capacitor board according to claim 1-7 any one, is characterized in that, described symmetrical expression capacitor board is rectangle, and the corner location of rectangular capacitive plate is respectively arranged with conductive interface described in a group; The described conductive interface of described corner location is symmetrical arranged between two along the symmetry axis of described rectangular capacitive plate.
9. symmetrical expression capacitor board according to claim 8, is characterized in that, described resistance is multiple, and multiple described resistant series connects.
10. a three phase converter, is characterized in that, comprising: the symmetrical expression capacitor board described in claim 1-9 any one, also comprises micro controller module and device for power switching module;
Described symmetrical expression capacitor board comprises conductive connecting element, and described conductive connecting element is electrically connected with DC power supply bus, and is electrically connected with described device for power switching module by described power source bus electrical connection; Described device for power switching module is used for and is electrically connected;
Described micro controller module is electrically connected with described device for power switching module, for controlling described device for power switching module work.
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| CN201510971173.2A CN105553243A (en) | 2015-12-22 | 2015-12-22 | Symmetric capacitor plate and three-phase frequency converter |
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| CN201510971173.2A CN105553243A (en) | 2015-12-22 | 2015-12-22 | Symmetric capacitor plate and three-phase frequency converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107819396A (en) * | 2016-09-14 | 2018-03-20 | 方惠娥 | A kind of comprehensive forceful electric power isolation and electric source filter circuit |
| CN112367760A (en) * | 2020-10-29 | 2021-02-12 | 科华恒盛股份有限公司 | Overcurrent structure, capacitor module and converter |
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| CN107819396A (en) * | 2016-09-14 | 2018-03-20 | 方惠娥 | A kind of comprehensive forceful electric power isolation and electric source filter circuit |
| CN112367760A (en) * | 2020-10-29 | 2021-02-12 | 科华恒盛股份有限公司 | Overcurrent structure, capacitor module and converter |
| CN112367760B (en) * | 2020-10-29 | 2022-06-10 | 科华恒盛股份有限公司 | Overcurrent structure, capacitor module and converter |
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Application publication date: 20160504 |