CN211791237U - Laminated busbar and frequency converter main loop - Google Patents

Abstract

The utility model discloses a female row of stromatolite and converter major loop, the female row of stromatolite includes conductive layer and top layer insulating film, the conductive layer is including a plurality of electrically conductive copper that are three layers of overall arrangement, through an insulating interval of insulating layer and fold the pressfitting molding in proper order mutually between every layer of electrically conductive copper, bottommost the riveting has the electrically conductive copper post that sets up in pairs on the electrically conductive copper, electrically conductive copper post to two surfaces of electrically conductive copper stretch out and link up the conductive layer. The laminated busbar and the main loop of the frequency converter have the advantages of low impedance and inductance, transient voltage drop reduction, oscillation suppression, electromagnetic interference reduction, bus eddy current heat effect reduction, high integration level, effective reduction of occupied space of frequency converter devices and improvement of reliability.

Description

Laminated busbar and frequency converter main loop

Technical Field

The utility model belongs to the technical field of the converter, especially, relate to a female row of stromatolite for converter and converter major loop.

Background

The laminated busbar is also called a composite busbar, a laminated busbar and a composite copper bar, and is a connecting bar with a multilayer composite structure. The use of composite bus bars provides a modern, easily designed, quickly installed and structurally sound power distribution system, as compared to conventional, bulky, time consuming and cumbersome wiring methods.

With the wide application of frequency converters in various industries, high requirements are put forward on the reliability and the electromagnetic compatibility of the frequency converters, wherein the main loop in the frequency converter, especially a rectification loop and an inversion loop, have the largest influence on the electromagnetic interference generated by a system. At present, a discrete busbar (copper bar) is generally adopted by high-power frequency converters at home and abroad as a connecting piece of a power device. The traditional discrete busbar has strong internal stress and overlarge parasitic inductance, the current change rate borne by a power device in an inverter circuit of a frequency converter is larger, and due to the existence of the parasitic inductance, the transient voltage generated at the moment of turning off the power device is superposed with the voltage of a direct-current loop to form a voltage peak, so that the problems of overvoltage, increase of output harmonic waves, serious EMI interference and the like of the device are caused, the normal work of the surrounding devices is influenced, and the problems can not disappear due to the replacement of a power switch. In addition, due to the on and off of the IGBT, the busbar of the main loop can generate a strong electromagnetic field and generate an eddy current effect, the electromagnetic field can be converted into heat energy, the service life of the device is shortened, and the system is damaged. Meanwhile, due to the high integration of the existing frequency converter and the motor, higher requirements are made on the space and the duty of components.

SUMMERY OF THE UTILITY MODEL

For solving foretell technical problem, the utility model provides a be applied to female the arranging of stromatolite of the power device topological structure of high integration degree of converter and use female converter of arranging of this stromatolite has low impedance, low inductance, reduces the transient pressure drop, and the suppression oscillation reduces electromagnetic interference, reduces the advantage of generating line vortex heat effect.

In order to realize the above-mentioned purpose, on the one hand, the utility model discloses a female row of stromatolite, including conductive layer and top layer insulating film, the conductive layer is including a plurality of electrically conductive copper that are three layers of overall arrangement, every layer through an insulating interval of insulating layer and the pressfitting type that superposes mutually in proper order between the electrically conductive copper, overall structure is compact, and distributed inductance is little, and the impedance is littleer, the bottommost the riveting has the electrically conductive copper post that sets up in pairs on the electrically conductive copper, electrically conductive copper post to two surfaces of electrically conductive copper stretch out and link up the conductive layer, and wherein, electrically conductive copper post stretches out to the lower surface so that the stromatolite is female arranges and converter major loop overlap joint, and electrically conductive copper post upwards stretches out.

Further, the conductor layer further includes:

a first conductor layer composed of a plurality of first conductive copper plates arranged in a matrix;

the second conductor layer consists of a rectangular second conductive copper plate and a plurality of third conductive copper plates which are arranged in a row and are arranged in the middle of the second conductive copper plate at intervals in a non-contact manner; and

and the third conductor layer consists of a plurality of fourth conductive copper plates which are arranged in a row and two fifth conductive copper plates which are symmetrically arranged at two sides of the fourth conductive copper plates.

Further, each all be equipped with a plurality of bottom holes on the electrically conductive copper board and dodge the hole, it runs through to dodge the hole electrically conductive copper board.

Further, the insulating layer comprises an insulating plate and insulating paper adhered to two surfaces of the insulating plate.

On the other hand, the utility model discloses a converter major loop adopts as above female the arranging of stromatolite, including rectification return circuit, contravariant return circuit, female overlap joint of arranging of stromatolite is in on the converter major loop.

Furthermore, the rectification loop adopts a three-phase six-pulse rectification bridge; the inversion loop is a three-phase inversion loop formed by six groups of inversion units.

Furthermore, the rectifier circuit comprises twelve diodes, the diodes are connected in series two by two to form one group, the group is divided into six groups, and each two groups of diodes are connected in series and then are connected in parallel to form a three-phase six-pulse rectifier bridge.

Furthermore, the inverter unit is formed by connecting six switching tubes in series two by two and then connecting the six switching tubes in parallel, and the switching tubes adopt but are not limited to switching devices such as MOS switching tubes and IGBT switching devices.

Furthermore, the positive electrode of the direct current input end of the inverter circuit is connected with the direct current output end DC + of the rectifier circuit; and the negative electrode of the direct current input end of the inversion loop is connected with the direct current output end DC-of the rectification loop.

Further, the first conductor layer of the laminated busbar corresponds to the three-phase output ends U1, V1, W1, U2, V2 and W2 of the inverter circuit;

the second conductor layer of the laminated busbar corresponds to the power input end DC-M of the inverter circuit and the rectifying circuit and the connecting end AC-M of each group of series diodes of the rectifying circuit;

the third conductor layer of the laminated busbar corresponds to the input end U, V, W of the rectifying circuit and the direct current output end DC + and DC-of the rectifying circuit.

Compared with the prior art, the utility model discloses an advantage lies in with positive effect:

the utility model adopts the laminated busbar technology to integrate the main loop of the frequency converter, so that the main loop of the frequency converter has the advantages of low impedance and low inductance, thereby effectively reducing transient voltage drop, inhibiting oscillation, reducing electromagnetic interference and reducing the eddy heat effect of the bus bar, and improving the reliability and electromagnetic compatibility of the frequency converter; and simultaneously the utility model discloses have the high integrated level, effectively reduced the occupation space of frequency conversion all-in-one components and parts, saved installation time.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic view of a laminated busbar according to an embodiment of the present invention;

fig. 2 is an exploded view of a laminated busbar according to an embodiment of the present invention;

fig. 3 is a schematic view of each layer of conductive copper plate according to an embodiment of the present invention;

fig. 4 is an equivalent electrical connection schematic diagram of the main circuit of the frequency converter according to the embodiment of the present invention.

Wherein:

1. a laminated busbar; 2. a conductor layer; 21. a first conductor layer; 22. a second conductor layer; 23. a third conductor layer; 3. a conductive copper plate; 31. a first conductive copper plate; 32. a second conductive copper plate; 33. a third conductive copper plate; 34. a fourth conductive copper plate; 35. a fifth conductive copper plate; 36. a conductive copper pillar; 37. a bottom hole; 38. avoiding holes; 4. an insulating layer; 5. a surface insulating film; 6. a frequency converter main loop; 61. a rectification circuit; 62. an inverter circuit.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Fig. 1 is a schematic view of a laminated busbar according to an embodiment of the present invention, and fig. 2 is an exploded view of the laminated busbar according to an embodiment of the present invention; referring to fig. 1-2, the present embodiment discloses a laminated busbar 1 for overlapping a main circuit 6 of a frequency converter, the laminated busbar 1 includes a conductive layer 2 and a surface insulating film 5 disposed on a surface layer of the laminated busbar, the conductive layer 2 includes a plurality of conductive copper plates 3 arranged in three layers, each conductive copper plate 3 is insulated and spaced by an insulating layer 4 and is sequentially laminated and molded, the surface layer of the laminated busbar 1 is provided with the surface insulating film 5, the insulating layer 4 between each conductive layer includes an insulating plate and insulating paper adhered to two surfaces of the insulating plate, the laminated busbar 1 has a compact overall structure, small distributed inductance and small impedance, conductive copper pillars 36 arranged in pairs are riveted on the conductive copper plate at the bottom layer and extend out to the two surfaces of the conductive copper plates and penetrate through the conductive copper plates 2, wherein the conductive copper pillars 36 extend out to the lower surface to facilitate overlapping the laminated busbar 1 with the main circuit 6 of the frequency converter, the conductive copper posts 36 project upwardly to ensure circuit continuity.

Fig. 3 is a schematic view of each layer of the conductive copper plate according to the embodiment of the present invention, and referring to fig. 3, the conductor layer 2 specifically includes: a first conductor layer 21 composed of six first conductive copper plates 31 arranged in a matrix; the second conductor layer 22 is composed of a rectangular second conductive copper plate 32 and six third conductive copper plates 33 which are arranged in a row and are arranged in the middle of the second conductive copper plate 32 at intervals in a non-contact manner; and a third conductor layer 23, which is composed of three fourth conductive copper plates 34 arranged in a row and two fifth conductive copper plates 35 symmetrically arranged on two sides of the fourth conductive copper plates 34, each conductive copper plate 3 of the present embodiment is provided with a plurality of bottom holes 37 and avoiding holes 38, the bottom holes 37 and avoiding holes 38 correspond to the conductive copper posts 36, and it is noted that the arrangement of each layer of conductive copper bars can also be adaptively adjusted according to the main circuit of the frequency converter.

On the other hand, the utility model discloses a converter major loop 6 adopts the female row of above-mentioned stromatolite, including rectification return circuit 61, contravariant return circuit 62, the female 1 overlap joint of arranging of stromatolite is on converter major loop 6.

Fig. 4 is an equivalent electrical connection schematic diagram of a main circuit of a frequency converter according to an embodiment of the present invention, and referring to fig. 4, a rectifier circuit 61 includes twelve diodes, the diodes are connected in series two by two to form a group, which is divided into six groups VD1, VD2 … …, and VD6, and each two groups of diodes are connected in series and then connected in parallel to form a three-phase six-pulse rectifier bridge; the inverter circuit 62 is a three-phase inverter circuit formed by six sets of inverter units, each inverter unit is formed by connecting six switching tubes in series and then in parallel, the switching tubes adopt but are not limited to switching devices such as MOS switching tubes and IGBTs, and the switching tubes of the embodiment adopt IGBTs as switching devices.

The positive electrode of the direct current input end of the inverter circuit 62 is connected with the direct current output end DC + of the rectifier circuit 61; the negative electrode of the direct current input end of the inverter circuit 62 is connected with the direct current output end DC-of the rectifier circuit 61; the first conductor layer 21 of the laminated busbar 1 corresponds to three-phase output ends U1, V1, W1, U2, V2 and W2 of the inverter circuit 62; the second conductor layer 22 of the laminated busbar 1 corresponds to the inverter circuit 62, the power input terminal DC-M of the rectifying circuit 61, and the connection terminal AC-M of each group of series diodes of the rectifying circuit 61, i.e., the connection terminal of the pin 4 and the pin 7 of each group of series diodes of the rectifying circuit 61 in fig. 4; the third conductive layer 23 of the laminated busbar 1 corresponds to the input end U, V, W of the rectifying circuit 61 and the DC output end DC + and DC-of the rectifying circuit 61.

Adopt this embodiment to pass through the female row realization electric connection of stromatolite with the rectification return circuit and the contravariant return circuit of converter major loop, adopt the female row of stromatolite as the connecting piece effectively improved integrated level and interference killing feature, have low impedance, low inductance, reduce the transient pressure drop, the suppression oscillation reduces electromagnetic interference, reduces the advantage of generating line vortex heat effect, simultaneously, increases device life, also reduces components and parts occupation space.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may use the above-mentioned technical contents to change or modify the equivalent embodiment into equivalent changes and apply to other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical matters of the present invention will still fall within the protection scope of the technical solution of the present invention.

Claims (10)

1. The utility model provides a female arranging of stromatolite, includes conductor layer and top layer insulating film, the conductor layer is including a plurality of electrically conductive copper that are three layers of overall arrangement, overlaps the shaping in proper order mutually through the insulating interval of an insulating layer between every layer of electrically conductive copper, the bottommost electrically conductive copper is last to be riveted with the electrically conductive copper post that sets up in pairs, electrically conductive copper post to two surfaces of electrically conductive copper stretch out and link up the conductor layer.

2. The laminated busbar according to claim 1, wherein the conductor layer further comprises:

a first conductor layer composed of a plurality of first conductive copper plates arranged in a matrix;

the second conductor layer consists of a rectangular second conductive copper plate and a plurality of third conductive copper plates which are arranged in a row and are arranged in the middle of the second conductive copper plate at intervals in a non-contact manner; and

and the third conductor layer consists of a plurality of fourth conductive copper plates which are arranged in a row and two fifth conductive copper plates which are symmetrically arranged at two sides of the fourth conductive copper plates.

3. The laminated busbar according to claim 1 or 2, wherein each of the conductive copper plates is provided with a plurality of bottom holes and relief holes, and the relief holes penetrate through the conductive copper plates.

4. The laminated busbar according to claim 3, wherein the insulating layer comprises an insulating sheet and an insulating paper adhered to both surfaces of the insulating sheet.

5. A frequency converter main loop, which adopts the laminated busbar according to any one of claims 1-4, characterized by comprising a rectifying loop and an inverting loop, wherein the laminated busbar is lapped on the frequency converter main loop.

6. The main circuit of a frequency converter according to claim 5, characterized in that said rectifying circuit uses a three-phase six-pulse rectifying bridge; the inversion loop is a three-phase inversion loop formed by six groups of inversion units.

7. The main circuit of claim 6, wherein said rectifying circuit comprises twelve diodes, said diodes are connected in series two by two to form one group, which is divided into six groups, and each two groups of diodes are connected in series and then connected in parallel to form a three-phase six-pulse rectifying bridge.

8. The main circuit of claim 7, wherein the inverter unit is formed by connecting six switching tubes in series two by two and then connecting them in parallel.

9. The main loop of the frequency converter according to claim 8, wherein the positive pole of the DC input terminal of the inverter loop is connected to the DC output terminal DC + of the rectifier loop; and the negative electrode of the direct current input end of the inversion loop is connected with the direct current output end DC-of the rectification loop.

10. The main circuit of the frequency converter as claimed in claim 9, wherein the first conductor layer of the laminated busbar corresponds to the three-phase output terminals U1, V1, W1, U2, V2, W2 of the inverter circuit;

the second conductor layer of the laminated busbar corresponds to the inverter circuit, the power input end DC-M of the rectifying circuit and the connecting end of each group of series diodes of the rectifying circuit;

the third conductor layer of the laminated busbar corresponds to the input end U, V, W of the rectifying circuit and the direct current output end DC + and DC-of the rectifying circuit.

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