CN217721673U - Controller and fan driver - Google Patents

Abstract

The embodiment of the utility model provides a controller and fan driver. The controller comprises a circuit board, a heating device, an insulating sheet, a radiator and a fixing component; the heating device is electrically connected with the circuit board; the heat generating device has a second hole, the heat sink has a third hole, and the insulating sheet has a fourth hole; the fixing component fixes the heating device, the insulating sheet and the radiator through a second hole, a fourth hole and a third hole; the outer surface of the fixed part comprises an insulating layer, and the insulating layer is at least positioned in the hole cavity of the fourth hole. The controller can meet the requirement of electrical safety distance and has high safety.

Description

Controller and fan driver

Technical Field

The application relates to the technical field of electric control, in particular to a controller and a fan driver.

Background

In an electronic control type controller, a heating device such as a switching tube, a freewheeling diode or a chip is often included; in order to dissipate heat of the heating device, a radiator is required to be installed; heat sinks are typically made of metal heat conductive materials, such as aluminum; because of the heating device is an electrified device, when the heating device is fixed to a radiator, the technical problem of how to ensure the electrical safety distance is solved.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the utility model provides a controller and fan driver can satisfy the electrical safety distance requirement.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:

a controller comprises a circuit board, a heating device, an insulating sheet, a radiator and a fixing component;

the heating device is electrically connected with the circuit board; the heat generating device has a second hole, the heat sink has a third hole, and the insulating sheet has a fourth hole; the fixing component fixes the heating device, the insulating sheet and the radiator through a second hole, a fourth hole and a third hole; the outer surface of the fixed part comprises an insulating layer, and the insulating layer is at least positioned in the hole cavity of the fourth hole. The controller can increase the distance between the heating device and the radiator by additionally arranging the insulating sheet, is favorable for improving the safety performance, and meets the requirement of electrical safety spacing.

The embodiment of the application also provides a fan driver, which comprises a circuit board, a fixed support, a screw, an insulating support, an insulating sheet and a radiator; the fan driving device is arranged on the circuit board and comprises an inversion unit, and the inversion unit comprises 6 IGBTs; the number of the screws, the insulating supports and the insulating sheets is equal to that of the IGBTs; the circuit board is provided with 6 first holes, and the aperture of each first hole is larger than the outer diameters of the screw cap and the outer diameter of the insulating support; the radiator is provided with 6 third holes; each insulation sheet is provided with a fourth hole, each IGBT is provided with a second hole, and each insulation support is provided with an inner cavity; the fixed bracket is provided with a first limit frame, a second limit frame and a third limit frame; the fixed bracket is fixedly installed with the radiator; wherein 1 insulating sheet is positioned in the first limiting frame, 2 insulating sheets are positioned in the second limiting frame, and 3 insulating sheets are positioned in the third limiting frame; the stud of each screw is arranged in the inner cavity of one insulating bracket; the screw that the cover was equipped with insulating support passes behind the first hole that corresponds, through second hole, the fourth hole that correspond and install to the third hole that corresponds, in order to realize IGBT, insulating piece, insulating support with the fixed mounting of radiator. This fan driver can increase the distance between device and the radiator that generates heat through addding insulating piece and insulating support, is favorable to improving the security performance, satisfies the electrical safety interval requirement.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required 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 bottom view of a heat generating device;

FIG. 2 is a cross-sectional view of a controller structure according to an embodiment of the present application;

FIG. 3 is an exploded schematic view of the controller of FIG. 2;

FIG. 4 is a cross-sectional view of another controller configuration provided in accordance with an embodiment of the present application and a partial enlarged view thereof;

FIG. 5 is an exploded schematic view of the controller of FIG. 4;

fig. 6 is a schematic structural diagram of a second insulating support according to an embodiment of the present application;

FIG. 7 is a cross-sectional view of a heat sink taken along a central longitudinal section of a third aperture according to an embodiment of the present application;

FIG. 8 is a cross-sectional view of a heat sink taken along a central longitudinal section of a third aperture according to another embodiment of the present application;

FIG. 9 is a cross-sectional view of a heat sink taken along a longitudinal cross-section through a center of a third aperture according to another embodiment of the present application;

FIG. 10 is an exploded view of a portion of another controller according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a fan driver according to an embodiment of the present disclosure;

FIG. 12 is an exploded view of the fan drive of FIG. 11;

fig. 13 is an exploded schematic view of a part of a controller according to an embodiment of the present disclosure before installation;

fig. 14 is a schematic view of the back side of the insulation sheet in fig. 13.

Detailed Description

For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings. It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be understood that the term "and/or" as used herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., A and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship. In the following description, the appearances of the designated orientations or positional relationships, such as the terms "inner", "outer", "upper", "lower", "left", "right", etc., are only for convenience of describing embodiments and simplifying the description according to the drawings, and do not indicate or imply that the designated devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.

In the field of electric control, such as an air conditioner controller, a fan driving board, an energy storage power supply and the like, many devices in the controller can generate heat, especially power devices (such as Insulated Gate Bipolar Transistors (IGBTs)) and rectifier diodes; in order to improve the stability and life of the controller, the heat generating device needs to be dissipated. At present, a heating device mainly dissipates heat by being fixed with a radiator and in heat conduction contact with the radiator; the heat sink is generally made of aluminum or other metal materials having high thermal conductivity; when the bolt is used for fixing, because the bolt, the radiating surface of the heating device and the radiator are all conductors, the electrical safety distance between the heating device, the bolt and the radiator is difficult to ensure. Specifically, the safety distance includes an electrical gap (space distance), a creepage distance (creepage distance), and an insulation penetration distance, which is generally achieved by selecting an insulation material that satisfies a specific requirement of an insulation grade; and the electrical clearance and the creepage distance need to be realized according to the wiring and mounting structure design of the circuit board. A general heat generating device, such as the IGBT shown in fig. 1, the IGBT in the package form has a mounting hole 21, the lower surface of the IGBT includes a metal layer, which has a heat dissipating function, and the metal layer is in heat conductive contact with a heat sink to dissipate heat; when the controller works, the metal layer is electrified; this metal layer is shown in fig. 1 as shaded portion 22 of the IGBT. How to ensure the safe distance between the metal layer and the heat sink is an urgent technical problem to be solved.

Based on this, the present embodiment provides a controller, as shown in fig. 2 to 3, including a circuit board 1, a heat generating device 2, an insulating sheet 4, a heat sink 3, and a fixing member 5;

the heating device 2 is electrically connected with the circuit board 1 to realize the electrical performance; the heat generating device 2 has a second hole 21, the heat sink 3 has a third hole 31, and the insulating sheet 4 has a fourth hole 41; the fixing component 5 fixes the heating device 2, the insulating sheet 4 and the heat sink 3 through the second hole 21, the fourth hole 41 and the third hole 31, and fixes the heating device 2 on the heat sink 3 to dissipate heat of the heating device 2, thereby ensuring the electrical performance of the heating device; and set up insulating piece 4 between device 2 and radiator 3 and can increase the creepage distance of the metal level of the device that generates heat to the radiator, can make the creepage distance between device metal level to the radiator that generates heat satisfy relevant requirement through adjustment insulating piece thickness, be favorable to improving the security of controller. In order to ensure the heat dissipation of the heat generating device, the insulating sheet 4 should be made of an insulating material with high thermal conductivity, such as ceramic, but may also be made of other materials with high thermal conductivity and high insulating grade. Further, heat conducting glue or heat conducting silicone grease can be coated between the components needing heat conduction to increase the heat conducting effect, such as between the metal layer of the heating device and the upper surface of the insulating sheet, and between the lower surface of the insulating sheet and the heat dissipation plane of the heat sink. The outer surface of the fixing part 5 comprises an insulating layer 51, the insulating layer 51 being located at least in the cavity of the fourth hole 41.

In one embodiment, the fixing member 5 may be made of an insulating material, and the outer surface of the fixing member 5 may also include an insulating layer 51, and the insulating layer 51 is located in the cavity of the fourth hole. In the embodiment, because the fixing part is insulated completely, electricity carried by the metal layer of the heating device cannot climb to the radiator through the fixing part; therefore, the requirement of creepage distance between the heating device and the radiator can be met by adjusting the thickness of the insulating sheet.

In another embodiment, the fixing element 5 comprises a screw, in which case the insulation comprises insulation material applied to the outer surface of the screw stud or an insulation sleeve surrounding the screw stud, the insulation material being located in the fourth hole; the insulating material is arranged on the stud in the fourth hole, so that electricity carried by the metal layer of the heating device is prevented from climbing to the radiator through the screw; meanwhile, the creepage distance of the path between the heating device and the radiator, namely the inner ring 23 of the heating device metal layer 22 → the second hole edge of the heating device → the thickness direction of the radiator → the radiator, can be met by setting the thickness of the insulating sheet.

In another embodiment, as shown in fig. 3, the fixing member 5 includes a screw 52, the insulating layer 51 includes a first insulating bracket 511 having a fifth hole 5111; the first insulating bracket 511 is sleeved outside the stud of the screw 52 through the fifth hole 5111; the aperture of the second hole 21 is larger than that of the third hole 31, the aperture of the fourth hole 41 is also larger than that of the third hole 31, the third hole 31 is provided with internal threads, the internal threads of the third hole 31 are matched with the external threads of a stud, the stud of the screw 52 is in threaded fit with the third hole 31, and the first insulating support 511, the heating device 2 and the insulating sheet 4 are installed on the radiator 3; after mounting, the upper surface of the first insulating support 511 abuts against the lower surface of the nut of the screw 52, and the lower surface of the first insulating support 511 abuts against the upper surface of the heat sink 3. The electric gap or creepage distance between the metal layer of the heating device 2 and the radiator 3 can be increased by arranging the first insulating support 511 and the insulating sheet 4, so that the controller meets the related requirements of safe distance.

In another embodiment, as shown in fig. 4-6, the fixing member comprises a screw 52, and the insulating layer comprises a second insulating holder 512; the second insulating bracket 512 comprises a first bracket part 5123 and a second bracket part 5122, wherein the first bracket part 5123 and the second bracket part 5122 are cylinders with inner cavities 5121, and the radii of the inner cavities of the first bracket part 5123 and the second bracket part 5122 are equal; the outer diameter of the second bracket part 5122 is larger than that of the first bracket part 5123; the stud of the screw 52 is arranged in the inner cavity 5121, the length of the stud is greater than that of the second insulating bracket 512, the outer diameter of the second bracket part 5122 is greater than the diameter of the second hole 21, and the first bracket part 5123 is at least positioned in the hole cavities of the second hole 21 and the fourth hole 41; the third hole 31 is provided with an internal thread, the internal thread of the third hole 31 is matched with the external thread of the stud, the stud of the screw 52 is in threaded fit with the internal thread of the third hole 31, and the second insulating support 512, the heat generating device 2 and the insulating sheet 4 are mounted on the heat sink 3.

In this embodiment, by setting the insulating sheet 4, the creepage distance of the path "the inner ring 23 of the heating device metal layer 22 → the second hole edge of the heating device → the thickness direction of the heat sink → the heat sink" can satisfy the requirement, and by setting the thickness of the insulating sheet 4, the requirement of the safety space of different levels can be satisfied. In some cases, the "inner ring 23 of the heat generating device metal layer 22 → the second hole edge of the heat generating device → the second hole depth → the screw" the safety pitch of the path does not satisfy the safety requirement either; therefore, in this embodiment, the second insulating support 512 further includes a first support portion 5123 and a second support portion 5122, and the second support portion 5122 is located between the nut of the screw and the upper surface of the heat generating device, so that the creepage path from the heat generating device metal layer to the screw is changed to "the inner ring 23 of the heat generating device metal layer 22 → the second hole edge of the heat generating device → the second hole depth → the second support portion → the screw", thereby meeting the safety distance requirement, adjusting the thickness of the second support portion 5122, adjusting the creepage distance, and meeting the safety distance requirement in different occasions.

Further, in order to ensure the heat dissipation performance, the insulation sheet should not be set too thick. As shown in fig. 4, the creepage distance between "the inner ring 23 of the heat generating device metal layer 22 → the second hole edge of the heat generating device → the thickness direction of the heat sink → the heat sink" is a + B; if the insulating sheet is thin, a + B may not meet the requirement of the safety distance; where a and r (r is the distance between the inner ring 23 of the heat generating device metal layer 22 and the edge of the second hole of the heat generating device as shown in fig. 1) are substantially equal. At this time, in order to secure the safety distance, in one embodiment, as shown in fig. 7 to 9, the third hole portion 311 is opened in the heat sink 3 so that the creepage distance is (a + B + C) to satisfy the safety distance requirement. As shown in fig. 7 to 9, the third hole 31 includes a third first hole portion 311 and a third second hole portion 312; the third second hole portion 312 is provided with an internal thread, and the screw 52 is fixed to the third second hole portion 312 by the thread; the upper hole of the third hole 311 has the outer diameter of the first frame portion 5123, and the first frame portion 5123 is partially located in the hole of the third hole 311. In this embodiment, the third hole 311 is added to adjust the electrical gap or creepage distance between the metal layer and the heat sink to meet the relevant requirements, so that the thickness of the insulating sheet can be reduced, and the influence of the design to meet the safety distance on the heat dissipation effect can be reduced as much as possible.

As shown in fig. 9, the central longitudinal section of the third first hole portion 311 is an inverted trapezoid, and the lower aperture of the third first hole portion 311 is equal to the aperture of the third second hole portion 312. As shown in fig. 7, the central longitudinal section of third first hole 311 is square, and the lower diameter of third first hole 311 is larger than the diameter of third second hole 312. As shown in fig. 8, the central longitudinal section of the third first hole portion 311 is an inverted trapezoid, and the lower diameter of the third first hole portion 311 is larger than the diameter of the third second hole portion 312. In addition, the third hole portion 311 may be provided with a groove having another shape, which is not limited in the present application.

In one embodiment, as shown in fig. 4-5, the circuit board 1 is provided with a first hole 11, the diameter of the first hole 11 being larger than the diameter of the nut of the screw 52; after the screw 52 sleeved with the second insulating support 512 passes through the first hole 11, the heating device 2, the insulating sheet 4 and the heat sink 3 are fixed through the second hole 21, the fourth hole 41 and the third hole 31; the upper surface of the second bracket part 5122 abuts against the lower surface of the screw 52 and the nut, and the lower surface of the second bracket part 5122 abuts against the upper surface of the heat generating device 2.

As shown in fig. 10, an embodiment of the present application further provides a controller, which includes a positioning element 8, where the positioning element 8 is fixedly installed with the heat sink 3; the positioning piece 8 is provided with a limiting frame 82 matched with the insulating sheet 4 in shape, and the insulating sheet is positioned in the limiting frame 82.

In the above embodiment, the insulating support may be a plastic support, the insulating sheet may be a ceramic sheet, the heating device may include an IGBT or a diode, the positioning member 8 may be a positioning support made of plastic, and the circuit board may be a PCB. The heat sink is a metal heat sink, such as an aluminum heat sink; in the temperature adjusting system, the controller can adopt a refrigerant heat dissipation mode or an air cooling heat dissipation mode.

As shown in fig. 13-14, the present embodiment further provides a controller, the fixing component of the controller includes a screw 52, the insulating layer includes a third insulating support 513; third insulating support 513 includes an upper support part 5131 and a lower support part 5132, and the outer diameter of lower support part 5132 is larger than that of upper support part 5131; the fourth hole 41 is a stepped hole, and the aperture of the stepped hole on the lower surface 412 of the insulating sheet 4 is larger than the aperture of the stepped hole on the upper surface 411 of the insulating sheet 4; upper bracket part 5131 passes through the step hole, and lower bracket part 5132 is positioned on the step of the step hole; the upper and lower bracket parts 5131 and 5132 are provided with inner cavities 5133 having equal radii; upper bracket portion 5133 is located within the bore of the stepped bore, the second bore and the fourth bore; the third hole 31 is provided with an internal thread; the screw of the screw passes through the inner cavity of the third insulating support 513 and is in threaded fit with the third hole 31. That is, the third insulating support 513 is first inserted into the hole cavity of the step hole and the second hole 21 from the lower side of the insulating sheet 4, and at this time, the lower bracket portion 5132 is located on the step, and then the screw is driven into the third hole through the inner cavity 5133 of the third insulating support 513, so that the heat generating device, the insulating support and the insulating sheet are fixedly mounted on the heat sink. In this embodiment, the fourth hole is a stepped hole, and the third insulating support 513 is an upper support part and a lower support part, so that the creepage distance from the metal layer of the heating device to the heat sink can be increased by the lower support part 5132, and the controller can meet the electrical safety distance requirement. In addition, in this embodiment, the thickness of the lower bracket portion 5132 may be set to be equal to or less than the step thickness, so that the lower surface of the lower bracket portion 5132 is flush with the lower surface 412 of the insulating sheet, or slightly higher than the lower surface of the insulating sheet, and thus the creepage distance requirement can be satisfied without forming a groove on the heat sink as shown in fig. 7 to 9.

As shown in fig. 11 to 12, the embodiment of the present application further provides a fan driver, which meets the requirement of safe spacing, and includes a circuit board 1, a fixing bracket 80, a screw 52, an insulating bracket 512, an insulating sheet 4, and a heat sink 3; a fan driving device is arranged on the circuit board 1 and comprises an inversion unit, the inversion unit comprises 6 IGBTs, and the IGBTs are heating devices; the number of the screws 52, the insulating supports 512 and the insulating sheets 4 is equal to the number of the IGBTs, and is 6 in the embodiment; each IGBT is mounted to the heat sink 3 by screws, insulating brackets, and insulating sheets. The circuit board 1 is provided with 6 first holes 11, the aperture of each first hole 11 is larger than the outer diameter of a screw cap of the screw 52 and the outer diameter of the insulating bracket, and the heat radiator 3 is provided with 6 third holes 31; each of the insulating sheets is provided with a fourth hole 41, each of the IGBTs has a second hole 21, and each of the insulating supports has an inner cavity. During installation, the screw 52 sleeved with the insulating bracket 512 can be driven into the third hole 31 through the second hole 21 and the fourth hole 41 after passing through the first hole 11, the third hole 31 is provided with an internal thread, and the third hole 31 is in threaded fit with the screw 52.

The fixing bracket 80 has a first position-restricting frame 801, a second position-restricting frame 802, and a third position-restricting frame 803. The fixing bracket 80 is fixedly installed with the heat sink 3, specifically, may be fixedly installed by a screw thread, and the application is not limited thereto. 1 insulating sheet 4 of the 6 insulating sheets is positioned in the first limiting frame 801, 2 insulating sheets 4 are positioned in the second limiting frame 802, and 3 insulating sheets 4 are positioned in the third limiting frame 803; the stud of each screw 52 is disposed in the inner cavity of one of the insulating supports 512; the screw sleeved with the insulating support 512 passes through the corresponding first hole 11 and then is installed to the corresponding third hole 31 through the corresponding second hole 21 and fourth hole 41, so that the fixed installation of the IGBT, the insulating sheet 4, the insulating support 512 and the heat sink 3 is realized.

Further, in one embodiment, the insulating bracket includes a second insulating bracket 512, a second insulating bracket first bracket portion 5123 and a second bracket portion 5122, the first bracket portion 5123 and the second bracket portion 5122 are cylinders having an inner cavity 5121, and the inner cavity radii of the first bracket portion 5123 and the second bracket portion 5122 are equal; the outer diameter of the second bracket portion 5122 is larger than that of the first bracket portion 5123; the stud of the screw 52 is installed in the inner cavity 5121, and the outer diameter of the second bracket part 5122 is larger than the aperture of the second hole 21;

as shown in fig. 9, the third hole 31 includes a third first hole portion 311 and a third second hole portion 312; the third second hole 312 is provided with a thread, and the screw 52 is fixed to the third second hole 312 by the thread; the upper aperture of the third hole portion 311 is larger than the outer diameter of the second bracket portion 5122, and the second bracket portion 5122 is partially located in the cavity of the third hole portion 311; the central longitudinal section of the third first hole portion 311 is an inverted trapezoid, and the lower aperture of the third first hole portion 311 is equal to the aperture of the third second hole portion 312; the upper surface of the second bracket part 5122 abuts against the lower surface of the nut of the screw 52, and the lower surface of the second bracket part 5122 abuts against the upper surface of the heating device 2; the first bracket portion 5123 is positioned in the bore of the second and fourth holes 21 and 41 and the first bracket portion 5123 is partially positioned in the bore of the third hole portion 311;

the fixing bracket 80 further comprises a plurality of buckles 804, and the circuit board 1 is fixedly installed with the fixing bracket 80 through the buckles 804.

The fan driver can be used for an air-conditioning system and used for driving an outdoor fan of an air conditioner, and the fan board can meet the requirement of electrical safety spacing by arranging an insulating sheet and an insulating bracket; the use of the fixing bracket 80 can realize the limitation of the insulating sheet and also realize the fixed installation of the circuit board and the radiator.

In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the specification. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The above description is only a preferred embodiment of the present disclosure, and should not be taken as limiting the present disclosure, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.

Claims (11)

1. A controller is characterized by comprising a circuit board, a heating device, an insulating sheet, a radiator and a fixing component;

the heating device is electrically connected with the circuit board; the heat generating device has a second hole, the heat sink has a third hole, and the insulating sheet has a fourth hole; the fixing component fixes the heating device, the insulating sheet and the radiator through a second hole, a fourth hole and a third hole; the outer surface of the fixed part comprises an insulating layer, and the insulating layer is at least positioned in the hole cavity of the fourth hole.

2. The controller of claim 1, wherein the securing member comprises a screw, the insulating layer comprises a first insulating bracket having a fifth hole; the first insulating bracket is sleeved outside the stud of the screw through the fifth hole; the upper surface of the first insulating bracket is abutted with the lower surface of a screw cap of the screw, and the lower surface of the first insulating bracket is abutted with the upper surface of the radiator; the second hole aperture is greater than the aperture of third hole, the aperture of fourth hole is greater than the aperture of third hole, third hole is provided with the internal thread, the internal thread with stud external screw thread phase-match.

3. The controller of claim 1, wherein the securing member comprises a screw, and the insulating layer comprises a second insulating support; the second insulating bracket comprises a first bracket part and a second bracket part, the first bracket part and the second bracket part are cylinders with inner cavities, and the radiuses of the inner cavities of the first bracket part and the second bracket part are equal; the outer diameter of the second bracket part is larger than that of the first bracket part; the stud of the screw is arranged in the inner cavity, the outer diameter of the second support part is larger than the aperture of the second hole, and the first support part is at least positioned in the hole cavity of the second hole and the fourth hole; the length of the stud is greater than that of the second insulating bracket; the third hole is provided with an internal thread, and the internal thread is matched with the external thread of the stud.

4. The controller of claim 3, wherein the third bore includes a third first bore portion and a third second bore portion; the third second hole part is provided with internal threads, and the screw is fixed with the third second hole part through threads; the upper bore of the third bore portion is larger than the outer diameter of the first bracket portion, and the first bracket portion is located in the bore of the third bore portion.

5. The controller according to claim 4, wherein a central longitudinal section of the third first hole portion is an inverted trapezoid, and a lower hole diameter of the third first hole portion is equal to a hole diameter of the third second hole portion.

6. The controller of claim 4, wherein the third first hole portion has a square central longitudinal cross-section, and the lower aperture of the third first hole portion is larger than the aperture of the third second hole portion;

or the central longitudinal section of the third first hole part is in an inverted trapezoid shape, and the lower aperture of the third first hole part is larger than the aperture of the third second hole part.

7. A controller according to any of claims 3 to 6, wherein the circuit board has a first hole having a diameter larger than the diameter of the nut of the screw; after the screw penetrates through the first hole, the heating device, the insulating sheet and the radiator are fixed through the second hole, the fourth hole and the third hole; the upper surface of the second support part is abutted with the lower surfaces of the screw and the nut, and the lower surface of the second support part is abutted with the upper surface of the heating device.

8. The controller according to any one of claims 1 to 6, further comprising a positioning member fixedly mounted with the heat sink; the positioning piece and the positioning piece are provided with a limiting frame matched with the insulating sheet in shape, and the insulating sheet is positioned in the limiting frame; the heat generating device includes an IGBT or a diode.

9. The controller of claim 1, wherein the securing member comprises a screw, and the insulating layer comprises a third insulating support; the third insulating bracket comprises an upper bracket part and a lower bracket part, and the outer diameter of the lower bracket part is larger than that of the upper bracket part; the fourth hole is a step hole, and the aperture of the step hole on the lower surface of the insulating sheet is larger than that of the step hole on the upper surface of the insulating sheet; the upper support part penetrates through the step hole, and the lower support part is positioned on a step of the step hole; the upper bracket part and the lower bracket part are provided with inner cavities with equal radiuses; the upper bracket part is at least partially positioned in the hole cavities of the stepped hole, the fourth hole and the second hole; the third bore is provided with an internal thread; and the stud of the screw penetrates through the inner cavity of the third insulating bracket and then is in threaded fit with the third hole.

10. A fan driver is characterized by comprising a circuit board, a fixing support, a screw, an insulating support, an insulating sheet and a radiator; the fan driving device is arranged on the circuit board and comprises an inversion unit, and the inversion unit comprises 6 IGBTs; the number of the screws, the insulating supports and the insulating sheets is equal to that of the IGBTs; the circuit board is provided with 6 first holes, and the aperture of each first hole is larger than the outer diameters of the screw cap and the outer diameter of the insulating support; 6 third holes are formed in the radiator; each insulation sheet is provided with a fourth hole, each IGBT is provided with a second hole, and each insulation support is provided with an inner cavity; the fixed bracket is provided with a first limit frame, a second limit frame and a third limit frame; the fixed bracket is fixedly installed with the radiator; wherein 1 insulating sheet is positioned in the first limiting frame, 2 insulating sheets are positioned in the second limiting frame, and 3 insulating sheets are positioned in the third limiting frame; the stud of each screw is arranged in the inner cavity of one insulating bracket; the screw that the cover was equipped with insulating support passes behind the first hole that corresponds, through second hole, the fourth hole that correspond and install to the third hole that corresponds, in order to realize IGBT, insulating piece, insulating support with the fixed mounting of radiator.

11. The fan drive of claim 10 wherein the insulating support comprises a second insulating support comprising first and second support portions, the first and second support portions being cylindrical with an inner cavity, the inner cavities of the first and second support portions having equal radii; the outer diameter of the second bracket part is larger than that of the first bracket part; the stud of the screw is arranged in the inner cavity, and the outer diameter of the second bracket part is larger than the aperture of the second hole;

the third bore includes a third first bore portion and a third second bore portion; the third second hole part is provided with internal threads, and the screw is fixed with the third second hole part through threads; the upper aperture of the third hole part is larger than the outer diameter of the second bracket part, and the second bracket part is partially positioned in the aperture of the third hole part; the central longitudinal section of the third first hole part is in an inverted trapezoid shape, and the lower aperture of the third first hole part is equal to the aperture of the third second hole part; the upper surface of the second support part is abutted with the lower surface of the screw and the nut, and the lower surface of the second support part is abutted with the upper surface of the IGBT; said first bracket portion being located within the bore of said second and fourth bores and said first bracket portion being located within the bore of said third bore portion;

the fixed bolster still includes a plurality of buckle, the circuit board pass through the buckle with fixed bolster fixed mounting.

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