阅读说明：本技术 一种散热良好的直流电机驱动设备 (Direct current motor driving device with good heat dissipation ) 是由 郭一军 支文龙 李文战 梁康康 刘智睿 于 2019-09-26 设计创作，主要内容包括：本发明公开了一种散热良好的直流电机驱动设备,包括防护外壳,所述防护外壳的内部依次固定连接有电源和半桥驱动电路板,所述半桥驱动电路板的输出端连接有电源接口,所述电源由7V转5V降压电路和5V转12V升压电路组成,其中7V由外部电池供给,12V电压提供给MOS管驱动电路,所述半桥驱动电路板的电路核心元器件包括IR2104S和MOS管,所述电源接口的电路由半桥驱动电路引出,接外设直流电机,本发明涉及直流电机驱动设备技术领域。该散热良好的直流电机驱动设备,达到了大大增加了驱动板的导热性能,增加其散热性,减小芯片发热对驱动电路使用的影响的目的。(The invention discloses direct current motor driving equipment with good heat dissipation, which comprises a protective shell, wherein a power supply and a half-bridge driving circuit board are fixedly connected inside the protective shell in sequence, the output end of the half-bridge driving circuit board is connected with a power supply interface, the power supply consists of a 7V-to-5V voltage reduction circuit and a 5V-to-12V voltage boost circuit, wherein 7V is supplied by an external battery, 12V voltage is supplied to an MOS (metal oxide semiconductor) tube driving circuit, circuit core components of the half-bridge driving circuit board comprise an IR2104S and an MOS tube, a circuit of the power supply interface is led out from the half-bridge driving circuit and is connected with an external direct current motor, and the invention relates to the technical field of direct current. This good direct current motor drive equipment dispels heat has reached greatly increased the heat conductivility of drive plate, increases its thermal diffusivity, reduces the purpose of the chip influence of generating heat to drive circuit use.)

1. The utility model provides a good direct current motor drive equipment dispels heat, includes protective housing (1), its characterized in that: the protection device is characterized in that a power supply (2) and a half-bridge driving circuit board (4) are fixedly connected inside the protection shell (1) in sequence, the output end of the half-bridge driving circuit board (4) is connected with a power interface (5), the power supply (2) is composed of a 7V-to-5V step-down circuit and a 5V-to-12V step-up circuit, wherein 7V is supplied by an external battery, and 12V voltage is supplied to an MOS tube driving circuit;

the circuit core components of the half-bridge driving circuit board (4) comprise an IR2104S and an MOS tube, and the circuit of the power interface (5) is led out by a half-bridge driving circuit and connected with an external direct current motor.

2. The direct current motor driving device with good heat dissipation according to claim 1, wherein: the 7V-to-5V circuit chip in the power supply (2) circuit is selected from LM2940, and the 5V-to-12V circuit chip is selected from MC 34063.

3. The direct current motor driving device with good heat dissipation according to claim 1, wherein: and the MOS tube of the half-bridge driving circuit board (4) is packaged by TO263 at the working temperature of-55-175 ℃ (TJ).

4. The direct current motor driving device with good heat dissipation according to claim 1, wherein: a circle of round holes are distributed on the periphery of the half-bridge driving circuit board (4), the PCB packaging object of the round holes is made of a metal material, and the ultrathin copper sheet subjected to insulation processing is made on the attached layer of the surface of the half-bridge driving circuit board (4).

5. The direct current motor driving device with good heat dissipation according to claim 1, wherein: the heat dissipation structure is characterized in that an upper cover plate (6) is arranged above the protective shell (1), heat dissipation grooves (7) are uniformly formed in the left side wall and the right side wall of the protective shell (1), and a heat dissipation bottom plate (3) is fixedly connected to the bottom of the protective shell (1).

6. The direct current motor driving device with good heat dissipation according to claim 5, wherein: the horizontal position of the bottom end in the supporting radiating bottom plate (3) is evenly provided with radiating holes.

Technical Field

The invention relates to the technical field of direct current motor driving equipment, in particular to direct current motor driving equipment with good heat dissipation.

Background

Along with the continuous change of the rules and the types of the intelligent automobiles for college students, the manufacturing requirements on the intelligent automobiles are higher and higher. Because the direct current motor models used by different intelligent vehicle models are different, the requirements on the driving circuit are different. Therefore, it is important to manufacture stable direct current motor drives suitable for motors of various models in intelligent vehicle competition.

In practical application, the biggest problem of direct current motor drive is unstable, and when motor power is too big, the drive circuit chip easily generates heat and burns out. Therefore, in order to drive the direct current motor stably, the selection of circuit components must be carefully driven, and the heat dissipation treatment of the circuit board is well performed.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides the direct current motor driving equipment with good heat dissipation, and solves the problems of instability and heat dissipation of a direct current motor driving circuit.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a good direct current motor drive equipment dispels heat, includes protective housing, protective housing's inside fixedly connected with power and half-bridge drive circuit board in proper order, half-bridge drive circuit board's output is connected with power source, the power is changeed 5V step-down circuit and 5V by 7V and is changeed 12V boost circuit and constitute, and wherein 7V is supplied with by external battery, and MOS pipe drive circuit is provided to 12V voltage, half-bridge drive circuit board's circuit core components and parts include IR2104S and MOS pipe, power source's circuit is drawn forth by half-bridge drive circuit, connects peripheral hardware direct current motor.

The main circuit of the direct current motor driving device comprises a power supply circuit, a half-bridge driving circuit and an external interface circuit.

The power supply circuit comprises a 7V-to-5V voltage reduction circuit and a 5V-to-12V voltage boosting circuit, wherein 7V is supplied by an external battery, and 12V voltage is supplied to the MOS tube driving circuit.

The half-bridge driving circuit core components comprise an IR2104S and MOS tubes.

The external interface circuit is led out by the half-bridge driving circuit and is connected with an external direct current motor.

Selecting the type of the components: the 7V-to-5V circuit chip in the power supply circuit selects LM2940, the input and output voltage of the LM2940 is reduced, the voltage drop is about 0.5V, the problem that the single chip microcomputer is reset due to the fact that the power supply voltage is reduced due to violent change of a motor can be effectively solved, the 5V-to-12V circuit chip selects MC34063, and the device comprises a single chip control circuit with main functions required by a DC/DC converter and is low in price. The device comprises a reference voltage generator with a temperature automatic compensation function, a comparator, an oscillator with a controllable duty ratio, an R-S trigger, a large-current output switching circuit and the like. The chip of the half-bridge driving circuit is selected from an IR2104S and a MOS tube. Among these, the IR2104S high voltage, high speed power MOSFET and IGBT drivers and associated high and low sides participate in the output channel, the logic inputs and standard CMOS outputs, down to 3.3V logic, the output driver has a high pulse current buffer stage, the lowest driver cross conduction, floating channel, which can be used to drive an N-channel power MOSFET. The MOS tube is packaged by TO263, the working temperature is-55-175 ℃ (TJ), an aluminum sheet is pasted on the chip when the MOS tube is welded, and the influence of the chip heating on the use of the driving circuit when the motor power is overlarge is greatly reduced.

(III) advantageous effects

The invention provides a direct current motor driving device with good heat dissipation. The method has the following beneficial effects:

this good direct current motor drive equipment dispels heat has laid a week round hole through the periphery of drive plate. The PCB packaging object of the round hole is made of metal materials, so that the good heat conductivity is achieved, and when the trolley runs, the round hole can increase the flow velocity of air flow and take away heat. The ultra-thin copper sheet (bendable deformation) subjected to insulation treatment is attached to the whole surface of the driving plate, so that the heat conduction performance of the driving plate is greatly improved, and the heat dissipation performance of the driving plate is improved; the MOS tube is packaged by TO263, the working temperature is-55-175 ℃ (TJ), an aluminum sheet is pasted on the chip when the MOS tube is welded, and the influence of the chip heating on the use of the driving circuit when the motor power is overlarge is greatly reduced.

Drawings

FIG. 1 is a front three-dimensional view of a split structure of the present invention;

FIG. 2 is a side three-dimensional view of a split structure of the present invention;

FIG. 3 is a PCB circuit diagram of the driving circuit of the present invention;

FIG. 4 is a block diagram of a power interface of the driving circuit of the present invention;

FIG. 5 is a block diagram of the power module of the driving circuit of the present invention from 7V to 5V;

FIG. 6 is a block diagram of the power module of the driving circuit of the present invention from 5V to 12V;

fig. 7 is a block diagram of a half-bridge driving module of the core part of the driving circuit of the present invention.

In the figure: the device comprises a protective shell 1, a power supply 2, a supporting radiating bottom plate 3, a half-bridge driving circuit board 4, a power supply interface 5, an upper cover plate 6 and a radiating groove 7.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 3, 4, 5 and 6, a main circuit of a dc motor driving apparatus with good heat dissipation mainly includes a power circuit portion, a half-bridge driving circuit portion, and an external interface circuit portion.

Referring to fig. 4 and 5, the power supply circuit includes a 7V to 5V buck circuit and a 5V to 12V boost circuit, where 7V is supplied by an external battery and 12V is supplied to the MOS transistor drive circuit. The LM2940 is used for chip selection in the 7V-to-5V voltage conversion circuit, and the reason is that the input and output voltage of the LM2940 is reduced, the voltage drop is about 0.5V, and the problem that the single chip microcomputer is reset due to the fact that the power supply voltage is reduced due to violent change of a motor can be effectively avoided. The MC34063 is selected as a 5V-to-12V voltage conversion circuit chip, and the reason is that the device comprises a single chip control circuit of main functions required by a DC/DC converter and is low in price. The device comprises a reference voltage generator with a temperature automatic compensation function, a comparator, an oscillator with a controllable duty ratio, an R-S trigger, a large-current output switching circuit and the like.

Referring to fig. 6, the voltage is increased to about 12V to control the G-pole of the MOS transistor, because the S-pole of the MOS transistor is directly grounded in the figure, so it is required to be 6V (fully conducting) for the G-pole voltage, and if the MOS transistor is conducting, then the S-pole of the MOS transistor is 7V for the G-pole voltage, the MOS transistor conducting condition is: VGS > the minimum on-voltage, therefore, the G-pole voltage of the MOS transistor must be at least one on-voltage higher than 7V, so that the voltage needs to be increased to about 12V to control the G-pole of the MOS transistor.

Referring to fig. 6 and 7, the chips mainly used in the half-bridge driving circuit include an IR2104S and MOS transistors. The external interface circuit is led out by the half-bridge driving circuit and is connected with an external direct current motor. IR2104S was chosen because IR2104S high voltage, high speed power MOSFET and IGBT drivers and associated high and low sides participate in the output channel, logic inputs and standard CMOS outputs down to 3.3V logic, the output driver has a high pulse current buffer stage, the lowest driver cross conduction, floating channel, can be used to drive an N-channel power MOSFET. In the driving process, the MOS tube is packaged by TO263 at the working temperature of-55-175 ℃ (TJ), and an aluminum sheet is pasted on the chip when the MOS tube is welded, so that the influence of the heating of the chip on the use of a driving circuit when the power of a motor is overlarge is greatly reduced

Referring to fig. 7, fig. 7 is an overall PCB diagram of the driving circuit, and it can be clearly seen that a circle of circular holes are distributed on the periphery of the PCB. The PCB packaging object of the round hole is made of metal material, and has good thermal conductivity. And when the trolley is driven, the circular holes can increase the flow velocity of the air flow and take away heat. After the drive plate is manufactured, an ultrathin copper sheet (bendable deformation) which is subjected to insulation treatment is attached to one layer of the whole surface of the drive plate, and the heat conductivity of the copper sheet is good, so that the heat conductivity of the drive plate can be greatly increased after treatment, and the heat dissipation performance of the drive plate is improved.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.