CN214672597U

CN214672597U - Motor controller

Info

Publication number: CN214672597U
Application number: CN202121387017.9U
Authority: CN
Inventors: 赵振涛
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-22
Filing date: 2021-06-22
Publication date: 2021-11-09
Anticipated expiration: 2031-06-22

Abstract

The utility model discloses a motor controller, which is characterized in that an MOS tube is independently arranged on a ceramic-based circuit board to form a ceramic substrate power module, and the ceramic substrate power module is welded on the motor controller circuit board and correspondingly connected with a circuit of the motor controller circuit board; the outer side of a ceramic base layer of the ceramic substrate power module is attached to the inner side of a metal shell of the motor controller to form a heat dissipation channel. By adopting the device and the method, the high temperature resistance and the high pressure resistance of the power device with large current can be optimized in a centralized way; the volume is reduced; the heat dissipation capability is improved; thereby promoting the work efficiency and the life-span of motor controller.

Description

Motor controller

Technical Field

The utility model relates to a controller product for driving a motor; wherein, a plurality of products adopt the frequency conversion technology.

Background

With the advance of technology, power tubes are used in electronic products in large quantities. MOS tube and IGBT are commonly used; the MOS transistor is also called as a field effect transistor; it has many uses, mainly used as switch component. The IGBT is another power tube, also called an insulated gate bipolar thyristor, and is mainly used as a switch component.

MOS transistors and IGBTs are used in a large number of electronic products such as frequency-variable home appliances, power supplies, motor controls, and inverters. In practical application, a MOS tube is used when the working current of a general product is small; when the working current of the product is large, the IGBT is adopted. The MOS tube is used for a motor driving controller, is a mature technology in the market, and a controller circuit mainly comprises an MOS tube group, an MCU and a power supply part.

The MOS transistor and the IGBT generate heat during the controlled switching process, and such heat generation is disadvantageous for the product and the device itself. The solution is mainly two aspects: firstly, the on-resistance of the MOS tube and the IGBT is reduced, and the method has technical limitation; and secondly, radiating fins are additionally arranged outside the heat-conducting plate and are fixed by gluing, and the heat conducting capacity of the glue is poor compared with that of metal. How to efficiently dissipate heat for MOS transistors and IGBT operation is a very important issue.

The ceramic-based circuit board is a special process board in which copper foil is directly bonded to the surface of a ceramic substrate at high temperature. The prepared composite substrate has excellent electrical insulation performance and high heat conduction characteristic. Comprises a ceramic substrate and a circuit layer. Compared with the common PCB commonly used at present, the ceramic-based circuit board has better thermal conductivity.

In order to improve the working efficiency of MOS tubes or IGBTs, a plurality of products are provided with radiating fins, and glue dispensing, insulating layers and the like are needed among the radiating fins; this hampers the speed of heat transfer and impairs the efficiency of the heat transfer path.

For products such as motor controllers of electric bicycles, the scheme of discrete MOS tubes is used at present, so that the heat dissipation optimization is not easy to be carried out, the occupied size is large, and the MOS tubes are easy to damage.

Disclosure of Invention

In order to solve the above problems, the present invention provides a motor controller, wherein an MOS transistor is separately mounted on a ceramic-based circuit board to form a ceramic substrate power module, and the power module is welded on the circuit board of the motor controller; the outer side of a ceramic base layer of the ceramic substrate power module is attached to the inner side of a metal shell of the motor controller to form a heat dissipation channel.

In order to achieve the technical purpose, the utility model provides a motor controller, which comprises a ceramic-based circuit board and two or more than two groups of MOS tubes, wherein the ceramic-based circuit board consists of a circuit layer and a ceramic base layer, and the two or more than two groups of MOS tubes are welded on the circuit layer of the ceramic-based circuit board; the circuit board also comprises two or more than two groups of metal pins, one end of each group of metal pins is welded on the circuit layer of the ceramic-based circuit board and is correspondingly connected with the two or more than two groups of MOS tubes; the motor controller circuit board is composed of a top layer circuit layer, a substrate layer and a bottom layer circuit layer, and the other ends of two or more than two metal pins are welded on the bottom layer circuit layer of the motor controller circuit board and correspondingly connected with circuits of the motor controller circuit board; still include the motor controller metal casing, the ceramic basic unit outside of ceramic base circuit board and the inboard laminating of motor controller metal casing form heat dissipation channel, promote the work efficiency of a set of MOS pipe of two or more than two. By forming the ceramic-based circuit board power module, the heat conducting capacity of the heat radiating channel is increased by utilizing the excellent heat conducting performance and the insulating property of the ceramic substrate; the volume is reduced. Two or more than two MOS tubes in the scheme can also adopt a wafer form, so that the miniaturization of the module volume is realized.

Preferably, the two or more groups of MOS transistors can be replaced by two or more groups of IGBTs. A group of two or more IGBTs may also take the form of a wafer.

The beneficial effects of this technical scheme are: higher power can be achieved with a smaller motor controller volume. And the large current part in the circuit can be optimized independently, thereby reducing the overall cost.

Drawings

Fig. 1 is a schematic cross-sectional view of a first embodiment of the present invention.

FIG. 2 is a schematic diagram of the resulting ceramic based circuit board module.

Fig. 3 is a reference circuit diagram of a MOS transistor portion of a three-phase driving circuit according to a second embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, a schematic cross-sectional view of a first embodiment of the present invention is shown. A motor controller comprises a ceramic-based circuit board 1 and two or more than two groups of MOS (metal oxide semiconductor) tubes 2, wherein the ceramic-based circuit board 1 consists of a circuit layer 11 and a ceramic base layer 12, and the two or more than two groups of MOS tubes 2 are welded on the circuit layer 11 of the ceramic-based circuit board 1; the circuit board also comprises two or more than two groups of metal pins 3, wherein one ends of the two or more than two groups of metal pins 3 are welded on the circuit layer 11 of the ceramic-based circuit board 1 and correspondingly connected with the two or more than two groups of MOS tubes 2; the motor controller circuit board 4 is composed of a top layer circuit layer 41, a substrate layer 42 and a bottom layer circuit layer 43, and the other ends of two or more than two groups of metal pins 3 are welded on the bottom layer circuit layer 43 of the motor controller circuit board 4 and correspondingly connected with the circuit of the motor controller circuit board 4; the top layer circuit layer 41 of the motor controller circuit board 4 is also provided with a capacitor 6 and an MCU7, and the motor controller circuit is a mature circuit which is produced and used in mass production in the market; still include motor controller metal casing 5, the ceramic substrate 12 outside and the inboard laminating of motor controller metal casing 5 of ceramic base course of ceramic base circuit board 1.

Fig. 2 is a schematic diagram of the structure of the ceramic-based circuit board module. The ceramic-based circuit board 1 consists of a circuit layer 11 and a ceramic base layer 12; a group of two or more than two MOS tubes 2 are welded on the circuit layer 11 of the ceramic-based circuit board 1; one end of two or more metal pins 3 is also soldered to the circuit layer 11 of the ceramic-based circuit board 1 and connected to two or more MOS transistors 2, wherein the two

parts

31 and 32 are respectively disposed at two ends of the ceramic-based circuit board 1.

As shown in fig. 3, a reference circuit diagram of a MOS transistor portion of a three-phase driving circuit according to a second embodiment of the present invention is shown. Comprises six MOS devices; the motor driving circuit is widely used in a motor driving circuit and is applied to a variable frequency controller.

The above, only do the preferred embodiment of the present invention, not used to limit the present invention, all the technical matters of the present invention should be included in the protection scope of the present invention for any slight modification, equivalent replacement and improvement of the above embodiments.

Claims

1. A motor controller characterized by: the circuit comprises a ceramic-based circuit board and two or more than two groups of MOS (metal oxide semiconductor) tubes, wherein the ceramic-based circuit board consists of a circuit layer and a ceramic base layer, and the two or more than two groups of MOS tubes are welded on the circuit layer of the ceramic-based circuit board; the circuit board also comprises two or more than two groups of metal pins, one end of each group of metal pins is welded on the circuit layer of the ceramic-based circuit board and is correspondingly connected with the two or more than two groups of MOS tubes; the motor controller circuit board is composed of a top layer circuit layer, a substrate layer and a bottom layer circuit layer, and the other ends of two or more than two metal pins are welded on the bottom layer circuit layer of the motor controller circuit board and correspondingly connected with circuits of the motor controller circuit board; still include motor controller metal casing, the ceramic basic unit outside of ceramic base circuit board is inboard with motor controller metal casing and is laminated.

2. A motor controller according to claim 1, wherein: the two or more than two groups of MOS transistors used can be replaced by two or more than two groups of IGBTs.