Frequency converter main loop and frequency converter

Abstract

The utility model discloses a frequency converter main loop and a frequency converter. The frequency converter main loop comprises a main driving board, an input terminal board, a capacitor board and an output terminal board. A rectification loop and an inversion loop are printed on the main driving board; a three-phase access end on the input terminal board is accessed to an input end of the rectification loop; the input end of the current carrying line is electrically connected with the output end of the rectification loop DC negative bus. The input end of a buffer circuit on the capacitor plate is electrically connected with the output end of the current carrying line, the output end of the buffer circuit is electrically connected with a filter circuit, and the filter circuit is connected between the positive input end and the negative input end of the inversion loop; the output terminal board is provided with a direct current interface, and the direct current interface is correspondingly and electrically connected with the direct current positive / negative output end of the capacitor board; according to the utility model, the strong current wiring layout and the weak current wiring layout can be separated, so that low-loss devices of the driving board are far away from high-calorific-value devices, the heat radiation influence on the low-loss devices is avoided, and the service life of the low-loss devices is ensured to meet the requirement of the designed service life of a product.

Description

TECHNICAL FIELD

[0001] The utility model relates to variable frequency equipment technical field especially relates to a variable frequency device main loop and a variable frequency device. BACKGROUND

[0002] In the product development process, the heat dissipation performance of the product is an important evaluation item that cannot be avoided, and good heat dissipation performance design can provide reliable guarantee for product life and stability.

[0003] Therefore, the selection of electronic components on the circuit board and the PCB wiring also follow the principle of thermodynamics: low-loss components are away from high-loss components, such as high-heat copper foil, which is required to avoid low-loss components in the design to reduce the impact on surrounding components and improve product life.

[0004] However, in actual product development, the middle part of the drive board of the frequency converter is provided with low-loss components such as chips and other components, and high-heat components such as copper foil for strong current wiring surround them, and the low-loss components such as chips and other components in the middle part are affected by the heat radiation of high-heat components, resulting in low service life and failing to meet the design life requirements of the product; even if a heat-conducting aluminum row is added to the copper foil for strong current wiring, it still cannot solve the heating problem of the board-level electronic components; and the cost of the scheme of adding a heat-conducting aluminum row is too high, which indirectly affects the market competitiveness of the product. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at solving at least one of the technical problems existing in the prior art. To this end, the utility model provides a variable frequency device main loop and a variable frequency device, which adjusts the layout of the direct current output of the main loop direct current positive / negative output end on the main drive board and the direct current output used by the user end, opens the surrounding ring of the strong current wiring of the drive board, separates the strong and weak current wiring layout, makes the low-loss components of the drive board away from high-heat components, avoids the heat radiation impact on the low-loss components, and ensures that the service life meets the design life requirements of the product.

[0006] In a first aspect, the embodiments of the present application provide a main circuit of a frequency converter, comprising a main drive board, an input terminal board, a capacitor board and an output terminal board; a rectification circuit and an inverter circuit are printed on the main drive board; a three-phase input interface, a three-phase access end and a current carrying line are arranged on the input terminal board; the three-phase access end accesses an input end of the rectification circuit; an input end of the current carrying line is electrically connected with an output end of a DC negative bus of the rectification circuit; a buffer circuit and a filter circuit are arranged on the capacitor board; an input end of the buffer circuit is electrically connected with an output end of the current carrying line, an output end of the buffer circuit is electrically connected with the filter circuit, and the filter circuit is connected between positive / negative input ends of the inverter circuit; the output terminal board is provided with a DC interface, a DC output interface and a three-phase output interface, and the DC interface is electrically connected with DC positive / negative output ends of the capacitor board.

[0007] Further, the output terminal board is provided with a three-phase output welding gold finger electrically connected with the three-phase output interface, the three-phase output welding gold finger accesses the main drive board, and the three-phase access end, the current carrying line and the positive / negative input ends of the filter circuit are connected with the circuits on the main drive board through welding gold fingers.

[0008] Further, the input terminal board, the capacitor board and the output terminal board are arranged on the same side of the main drive board, and the input terminal board, the capacitor board and the output terminal board are arranged in sequence.

[0009] Further, the capacitor board is provided with a relay and a buffer resistor, the relay and the buffer resistor constitute the buffer circuit; the current carrying line is connected to one side of the capacitor board; the relay and the buffer resistor are arranged on the other side of the capacitor board.

[0010] Further, the capacitor board is further provided with a relay switch gold finger, the relay switch gold finger is electrically connected with the relay, and the relay switch gold finger accesses the main drive board.

[0011] Further, the three-phase input interface is arranged on the input terminal board away from the capacitor board; the current carrying line is connected to the capacitor board close to the input terminal board; and the three-phase output interface is arranged on the output terminal board away from the capacitor board.

[0012] Further, the current carrying line comprises a cable, and the current carrying line is connected with a welding terminal on the capacitor board through a screw.

[0013] Further, the capacitor plate and the output terminal plate are fixed by a screw, and the DC interface and the DC positive / negative output end of the capacitor plate are electrically connected at the position of the screw.

[0014] Further, the input terminal plate, the capacitor plate and the output terminal plate are combined into a first sub-circuit plate printed with a circuit, and the current carrying line can be directly printed on the first sub-circuit plate; or the input terminal plate and the capacitor plate are combined into a second sub-circuit plate printed with a circuit, and the current carrying line can be directly printed on the second sub-circuit plate.

[0015] In the second aspect, the utility model embodiment further proposes a frequency converter, including the frequency converter main circuit as the first aspect.

[0016] The utility model discloses a kind of frequency converter main circuit and a kind of frequency converter, compared with prior art, its beneficial effect is in that:

[0017] Three-phase input interface on input terminal plate can be accessed external device, three-phase access end accesses the input end of rectification loop, the input end of current carrying line and the output end of rectification loop DC negative bus are electrically connected, the current transmitted on current carrying line is larger, the current after rectification is extracted from main drive board by current carrying line, can reduce the load pressure on main drive board, and strong current can be far away from chip and other low-loss components on main drive board;Buffer circuit input end on capacitor plate and the output end of current carrying line are electrically connected, the output end of buffer circuit and filter circuit are electrically connected, filter circuit is connected between positive / negative input end of inverter loop, DC interface on output terminal plate and DC positive / negative output end of capacitor plate are electrically connected correspondingly, this electrical connection wiring is short, can avoid the problem of wiring space occupation and the problem of heat radiation electronic component on main drive board;DC output interface, three-phase output interface can output DC, AC to external device;Herein, the utility model can make strong, weak electric wiring layout separate, make low-loss component of drive board far away from high heat-generating device, avoid the influence of heat radiation to low-loss component, ensure that service life meets the requirement of design life of product. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is circuit structure schematic view of the frequency converter main circuit of the utility model embodiment;

[0019] Figure 2 It is structure schematic view of the frequency converter main circuit of the utility model embodiment;

[0020] Figure 3 It is Figure 2 Another view structure schematic view of the frequency converter main circuit shown in figure 6;

[0021] Figure 4 Fig. 1 is a structural schematic view of an input terminal plate of a main circuit of a frequency converter shown in the utility model; Figure 2

[0022] Figure 5 Fig. 2 is a structural schematic view of a capacitor plate of the main circuit of the frequency converter shown in the utility model; Figure 2

[0023] Figure 6 Fig. 3 is a structural schematic view of another view of the capacitor plate shown in the utility model; Figure 5

[0024] Figure 7 Fig. 4 is a structural schematic view of an output terminal plate of the main circuit of the frequency converter shown in the utility model; Figure 2

[0025] Fig. 5 is a structural schematic view of the input terminal plate, the capacitor plate and the output terminal plate of other embodiments of the utility model being arranged as one common plate; Figure 8

[0026] Fig. 6 is a structural schematic view of the input terminal plate and the capacitor plate of other embodiments of the utility model being arranged as one common plate; Figure 9 In the drawings, the reference signs have the following meanings:

[0027] 1, main drive plate; 2, input terminal plate; 3, capacitor plate; 4, output terminal plate; 5, rectification circuit; 6, inversion circuit; 7, three-phase input interface; 8, three-phase input end; 9, current carrying line; 10, direct current interface; 11, direct current output interface; 12, three-phase output interface; 13, three-phase output welding gold finger; 14, relay; 15, buffer resistance; 16, relay switch gold finger; 17, welding terminal; 18, direct current positive / negative output end of the capacitor plate; 19, rectification bridge; 20, filter circuit; 21, first gold finger; 22, second gold finger; 23, first auxiliary circuit plate; 24, second auxiliary circuit plate.

[0028] DETAILED DESCRIPTION

[0029] The embodiments of the utility model are described in detail below, examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.

[0030] ​​​​In the description of the utility model, it is understood that the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, up, down, etc., is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and is not to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore can not be understood as a limitation on the utility model.

[0031] As Figures 1-9 The utility model embodiment proposes a kind of frequency converter main loop in first aspect, including main drive board 1, input terminal plate 2, capacitor board 3 and output terminal plate 4;Rectifier circuit 5 and inverter circuit 6 are printed on main drive board 1;Three-phase input interface 7, three-phase access end 8 and current carrying line 9 are provided on input terminal plate 2;Three-phase access end 8 is accessed the input end of rectifier circuit 5;The input end (first gold finger 21) of current carrying line 9 and the output end of rectifier circuit 5 DC negative bus are electrically connected;Buffer circuit and filter circuit 20 are provided on capacitor board 3;The input end of buffer circuit and the output end of current carrying line 9 are electrically connected, the output end of buffer circuit and filter circuit 20 are electrically connected, and filter circuit 20 is connected between the positive / negative input end of inverter circuit 6;Output terminal plate 4 is provided with DC interface 10, DC output interface 11 and three-phase output interface 12, and DC interface 10 and the DC positive / negative output end 18 of capacitor board 3 are electrically connected correspondingly.

[0032] Based on the above technical scheme, three-phase input interface 7 on input terminal plate 2 can be accessed external equipment, three-phase access end 8 is accessed the input end of rectifier circuit 5, the input end (first gold finger 21) of current carrying line 9 and the output end of rectifier circuit 5 DC negative bus are electrically connected, the current transmission on current carrying line 9 is larger, and the current after rectification is led out from main drive board 1 by current carrying line 9, can reduce the load pressure on main drive board 1, and strong current can be far away from the chip and other low-loss components on main drive board 1;The input end of buffer circuit on capacitor board 3 and the output end of current carrying line 9 are electrically connected, the output end of buffer circuit and filter circuit 20 are electrically connected, and filter circuit 20 is connected between the positive / negative input end of inverter circuit 6 by second gold finger 22, and DC interface 10 on output terminal plate 4 and the DC positive / negative output end 18 of capacitor board 3 are electrically connected correspondingly, this electrical connection wiring is short, can avoid the problem of wiring space occupation and the problem of heat radiation electronic components in main drive board 1;DC output interface 11 and three-phase output interface 12 can output DC, AC to external equipment;Herein, the utility model can separate strong and weak electric wiring layout, make the low-loss device of main drive board 1 far away from the device of high heat generation, avoid the heat radiation influence to low-loss component, ensure that its service life meets the design life requirement of product.

[0033] As Figures 2-7As shown in the figure, in some embodiments, the output terminal plate 4 is provided with a three-phase output soldered gold finger 13 electrically connected with the three-phase output interface 12, which is connected into the main drive board 1; and the three-phase access end 8, the current carrying line 9 and the positive / negative input end of the filter circuit 20 are all connected with the circuit on the main drive board 1 through the soldered gold finger.

[0034] Specifically, the three-phase L1 / L2 / L3 of the external equipment is input into the main circuit of the frequency converter through the input terminal plate 2 terminal seat wiring--three-phase input interface 7, the input terminal plate 2 is electrically connected with the main drive board 1 through the soldered gold finger, and the three-phase L1 / L2 / L3 is rectified in the rectifier circuit 5 of the main drive board 1; then, the rectified direct current is returned from the main drive board 1, and the negative output end (i.e. DC-) can be transmitted to the capacitor plate 3 through the current carrying line 9, and the current carrying line is connected with the buffer circuit and the filter circuit 20 on the capacitor, and after electrolytic capacitor filtering, the direct current is output to the main drive board 1 (the main drive board 1 outputs DC+ and DC- at the same time), which is used for the inverter circuit 6 on the main drive board 1; the other direct current is led out from the other end of the capacitor plate 3 (the capacitor plate 3 outputs DC+ and DC-), and is led out through the output terminal plate 4 wiring and terminal seat for the user to use, which can avoid the problem of occupying space and the problem of heat radiation electronic components caused by the wiring of the main drive board 1; the output terminal plate 4 can lead out the U / V / W three-phase from the main drive board 1 through the three-phase output interface 12 for the user to connect the motor.

[0035] It should be noted here that the DC+ gold finger adopts different potentials of the surface layer and the bottom layer to realize bidirectional wiring.

[0036] The input terminal plate 2, the capacitor plate 3 and the output terminal plate 4 are all arranged on the same side of the main drive board 1, and the input terminal plate 2, the capacitor plate 3 and the output terminal plate 4 are sequentially arranged.

[0037] The relay 14 and the buffer resistor 15 are arranged on the capacitor plate 3, the relay 14 and the buffer resistor 15 form a buffer circuit, the current carrying line 9 is connected to one side of the capacitor plate 3, and the relay 14 and the buffer resistor 15 are arranged on the other side of the capacitor plate 3, which can avoid the influence of the current carrying line on the relay 14 and the buffer resistor 15.

[0038] The relay switch gold finger 16 is further arranged on the capacitor plate 3, the relay switch gold finger 16 is electrically connected with the relay 14, the surface layer and the bottom layer of the gold finger respectively adopt different signal circuits to realize bidirectional signal interaction, which is used for controlling the opening and closing of the relay 14, and the relay switch gold finger 16 is connected into the main drive board 1.

[0039] And, the three-phase input interface 7 is arranged on the input terminal plate 2 away from the capacitor plate 3, the current carrying line 9 is connected at the position of the capacitor plate 3 close to the input terminal plate 2, and the three-phase output interface 12 is arranged on the output terminal plate 4 away from the capacitor plate 3.

[0040] As shown in the first aspect, Figure 2 As shown in the first aspect,

[0041] The current carrying line 9 includes a cable, and the current carrying line 9 is connected through a screw and a welding terminal 17 on the capacitor plate 3; the current carrying line can lead excessive direct current away from the main drive plate 1, so as to be far away from low-loss components on the main drive plate 1, thereby reducing the load pressure on the main drive plate 1 and increasing the heat dissipation effect of the components on the main drive plate 1.

[0042] The capacitor plate 3 and the output terminal plate 4 are fixed through a screw, and the direct current interface 10 and the direct current positive / negative output end 18 of the capacitor plate 3 are electrically connected at the screw position, and the direct current positive / negative output end 18 of the capacitor plate 3 is fixed through a welding terminal 17 of the output terminal plate 4 and a screw locking, so as to realize electrical connection; direct current is led out from the terminal seat on the output terminal plate 4 and used by a user; the circuit wiring is short, and the problems of occupied space and heat radiation electronic components caused by wiring on the drive plate are avoided.

[0043] In other embodiments, the input terminal plate 2, the capacitor plate 3 and the output terminal plate 4 are combined into a first secondary loop plate 23 printed with a circuit, and the current carrying line 9 can be directly printed on the first secondary loop plate 23; the direct current exchanged on the capacitor plate 3 and the direct current led out for use by the user are realized on the first secondary loop plate 23, so that the current carrying line 9, that is, the cable, and the welding terminal 17 on the capacitor plate 3 can be omitted, thereby reducing assembly process and shortening working hours.

[0044] Alternatively, the input terminal plate 2 and the capacitor plate 3 are combined into a second secondary loop plate 24 printed with a circuit, and the current carrying line 9 can be directly printed on the second secondary loop plate 24, so that the current carrying line 9, that is, the cable, can be omitted.

[0045] The utility model embodiment further provides a frequency converter in the second aspect, including the frequency converter main loop of the first aspect.

[0046] In the description of the utility model, if the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number.If it is described to the first, the second is only used for distinguishing the purpose of technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0047] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection should be understood in a broad sense, and the person skilled in the art in the technical field can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0048] In the description of the utility model, the description of reference terms such as "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the utility model.In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0049] The technical means disclosed in the utility model scheme is not only limited to the technical means disclosed in the above-mentioned embodiment, but also includes the technical scheme composed of any combination of the above technical features.It should be pointed out that for the person skilled in the art in this technical field, without departing from the principle of the utility model, some improvements and refinements can also be made, which are also considered as the protection scope of the utility model.

Claims

1. A frequency converter main circuit, characterized in that, It comprises a main drive board (1), an input terminal board (2), a capacitor board (3) and an output terminal board (4); The main drive board (1) is printed with a rectifier circuit (5) and an inverter circuit (6); The input terminal board (2) is provided with a three-phase input interface (7), a three-phase access end (8) and a current carrying line (9); The three-phase access end (8) accesses the input end of the rectifier circuit (5); The input end of the current carrying line (9) is electrically connected with the output end of the DC negative bus of the rectifier circuit (5); The capacitor board (3) is provided with a buffer circuit and a filter circuit (20); The input end of the buffer circuit is electrically connected with the output end of the current carrying line (9), the output end of the buffer circuit is electrically connected with the filter circuit (20), and the filter circuit (20) is connected between the positive / negative input end of the inverter circuit (6); The output terminal board (4) is provided with a DC interface (10), a DC output interface (11) and a three-phase output interface (12), and the DC interface (10) is electrically connected with the DC positive / negative output end (18) of the capacitor board (3) in correspondence.

2. The frequency converter main circuit according to claim 1, characterised in that The output terminal board (4) is provided with a three-phase output welding gold finger (13) electrically connected with the three-phase output interface (12), and the three-phase output welding gold finger (13) accesses the main drive board (1); Furthermore, the three-phase access end (8), the current carrying line (9) and the positive / negative input end of the filter circuit (20) are connected with the circuit on the main drive board (1) through the welding gold finger.

3. The frequency converter main circuit according to claim 2, characterised in that The input terminal board (2), the capacitor board (3) and the output terminal board (4) are arranged on the same side of the main drive board (1), and the input terminal board (2), the capacitor board (3) and the output terminal board (4) are arranged in sequence.

4. The frequency inverter main circuit according to claim 3, characterized by The capacitor board (3) is provided with a relay (14) and a buffer resistor (15), and the relay (14) and the buffer resistor (15) constitute the buffer circuit; The current carrying line (9) is connected to one side of the capacitor board (3); The relay (14) and the buffer resistor (15) are arranged on the other side of the capacitor board (3).

5. The frequency inverter main circuit according to claim 4, characterized in that, The capacitor board (3) is further provided with a relay switch gold finger (16), the relay switch gold finger (16) is electrically connected with the relay (14), and the relay switch gold finger (16) accesses the main drive board (1).

6. The frequency converter main circuit of claim 5, wherein, The three-phase input interface (7) is arranged on the input terminal board (2) away from the capacitor board (3); The current carrying line (9) is connected to the capacitor board (3) close to the input terminal board (2); The three-phase output interface (12) is arranged on the output terminal board (4) away from the capacitor board (3).

7. The frequency converter main circuit of claim 6, wherein, The current carrying line (9) comprises a cable, and the current carrying line (9) is connected with the welding terminal (17) on the capacitor board (3) through a screw.

8. The frequency inverter main circuit according to claim 3, characterized by The capacitor plate (3) and the output terminal plate (4) are fixed by a screw, and the DC interface (10) and the DC positive / negative output end of the capacitor plate (3) are electrically connected at the screw position.

9. The frequency inverter main circuit according to claim 1, characterized by, The input terminal plate (2), the capacitor plate (3) and the output terminal plate (4) are combined into a first sub-circuit plate (23) printed with a circuit, and the current carrying line (9) can be directly printed on the first sub-circuit plate (23). Alternatively, the input terminal plate (2) and the capacitor plate (3) are combined into a second sub-circuit plate (24) printed with a circuit, and the current carrying line (9) can be directly printed on the second sub-circuit plate (24).

10. A frequency converter, characterized in that The frequency converter main circuit comprises the frequency converter main circuit according to any one of claims 1-9.

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