阅读说明：本技术 电机驱动器和基于电机驱动器的电路结构 (Motor driver and circuit structure based on motor driver ) 是由 李光学 耿海龙 包睿 王首浩 岳宗帅 于 2020-10-23 设计创作，主要内容包括：本发明提供一种电机驱动器和基于电动驱动器的电路结构,电机驱动器用于驱动和控制电机转动,实现电机转速和转向的控制,包括：稳压电路、输入电路、逻辑控制电路、驱动电路、三相桥电路。本发明公开的电机驱动器采用高功率密度小型化设计,覆盖功率范围广,通用型号,且采用多功能集成,有效减少外围器件的同时,节约了成本,且本发明的电机驱动器,自带过流保护电路,适用于负载突变,频繁换向的恶劣工况,保证了电路工作可靠性,同时采用采用PCB板和陶瓷覆铜板表面贴装实现良好的散热,可用于高温环境,工作稳定性更有保障。(The invention provides a motor driver and a circuit structure based on the motor driver, wherein the motor driver is used for driving and controlling a motor to rotate, and realizing the control of the rotating speed and the rotating direction of the motor, and comprises the following components: voltage stabilizing circuit, input circuit, logic control circuit, drive circuit, three-phase bridge circuit. The motor driver disclosed by the invention adopts a high-power-density miniaturized design, is wide in coverage power range and universal in model, adopts multifunctional integration, effectively reduces peripheral devices and saves cost, is provided with an overcurrent protection circuit, is suitable for severe working conditions of sudden load change and frequent reversing, ensures the working reliability of the circuit, and can be used in a high-temperature environment and ensures the working stability by adopting the surface mounting of a PCB (printed circuit board) and a ceramic copper-clad plate.)

1. A motor driver, characterized in that, the motor driver is used for driving and controlling the motor to rotate, realizes motor speed and steering control, includes: the circuit comprises a voltage stabilizing circuit, an input circuit, a logic control circuit, a driving circuit and a three-phase bridge circuit; the voltage stabilizing circuit is used for converting an external input power supply into working voltage of the motor driver, supplying power to the input circuit, the logic control circuit and the driving circuit and supplying power to a Hall circuit of the motor, and the Hall circuit is used for detecting the rotating speed and the rotating direction of the motor and generating a first Hall signal; the input circuit is used for converting the first Hall signal into a second Hall signal and filtering the second Hall signal; the logic control circuit is used for logically controlling and processing the second Hall signal and outputting a logic signal for controlling the three-phase bridge circuit; the drive circuit is used for amplifying the current of the preceding-stage signal and realizing the grid drive of the switching tube; the three-phase bridge circuit is used for converting the direct-current voltage into the alternating-current voltage of the motor and outputting the alternating-current voltage to a three-phase winding of the motor; one output end of the voltage stabilizing circuit is electrically connected with the first input end of the input circuit, the first input end of the logic control circuit, the first input end of the driving circuit and the input end of the Hall circuit respectively, the second input end of the input circuit is electrically connected with the first Hall signal end, the output end of the input circuit is electrically connected with the second input end of the logic control circuit, the output end of the logic control circuit is electrically connected with the second input end of the driving circuit, one output end of the driving circuit is electrically connected with the input end of the three-phase bridge circuit, and the output end of the three-phase bridge circuit is electrically connected with the motor.

2. The motor driver of claim 1, further comprising: the isolation circuit is used for isolating a speed regulation signal, a forward and reverse rotation control signal and a circuit signal inside the motor driver, the input end of the isolation circuit is electrically connected with a speed regulation signal end, a forward and reverse rotation control signal end and a control signal ground end respectively, and the output end of the isolation circuit is electrically connected with the third input end of the logic control circuit.

3. The motor driver of claim 1, further comprising: and the isolation circuit is used for converting the output level of the speed regulating signal and the positive and negative rotation control signal into an input level matched with the logic control circuit.

4. The motor driver of claim 1, further comprising: the overcurrent protection circuit is used for limiting the output current value of the motor driver within a first threshold range, the input end of the overcurrent protection circuit is electrically connected with one end of a sampling circuit of the motor driver, the output end of the overcurrent protection circuit is electrically connected with the fourth input end of the logic control circuit, and the sampling circuit is used for providing sampling current for the overcurrent protection circuit.

5. The motor driver of claim 4, wherein the over-current protection circuit determines whether the output current value of the motor driver is over-current by detecting a sampled resistance current value of the motor driver, and comprises: when the current value of the sampling resistor is larger than or equal to a first threshold value, the output end of the overcurrent protection circuit outputs a low level, and when the current value of the sampling resistor is smaller than the first threshold value, the output end of the overcurrent protection circuit outputs a high level.

6. The motor driver according to claim 3 or 5, wherein the logic control circuit is further configured to output a logic signal for controlling the three-phase bridge circuit according to the output level of the overcurrent protection current and the speed regulation signal, and includes: and the output level of the overcurrent protection current and the speed regulation signal output a logic signal for controlling the three-phase bridge circuit through an AND logic gate circuit.

7. A circuit arrangement based on a motor driver, characterized in that the motor driver comprises all the elements of the motor driver of claims 1 to 6, including the power tube element of a three-phase sampling circuit, the sampling resistor element and the elements of the voltage stabilizing circuit, the input circuit, the logic control circuit, the driving circuit, the circuit arrangement comprising: the device comprises a first carrier substrate, a second carrier substrate and a metal shell, wherein the first carrier substrate is of a ceramic copper clad plate structure, the second carrier substrate is of a PCB structure, the first carrier substrate and the second carrier substrate are parallelly distributed inside the metal shell in an up-and-down parallel mode, the first carrier substrate is fixedly welded to the bottom surface of the metal shell, other bottom surfaces of the metal shell are encapsulated in glue pouring parallel seam welding, a power tube element of a three-phase sampling circuit and a sampling resistance element are fixed on the first carrier substrate, and elements of a voltage stabilizing circuit, an input circuit, a logic control circuit and a driving circuit are fixed on the second carrier substrate.

8. The circuit structure of claim 7, wherein the board pitch of the second carrier substrate from the first carrier substrate is in the range of (0-10) mm.

9. The circuit structure of claim 7, wherein the power tube is vacuum-welded to the copper-clad ceramic plate.

10. The circuit structure of claim 7, wherein the first carrier substrate and the second carrier substrate are soldered by copper core studs and interconnected by soft high temperature wire.

Technical Field

The invention relates to the technical field of electronic circuits, in particular to a motor driver and a circuit structure based on the motor driver.

Background

The direct current brushless motor has the advantages of long service life, low maintenance cost, high reliability, high efficiency, energy conservation and the like, is more and more widely applied in various fields, and the brushless motor driver is used for driving and controlling the functions of the direct current brushless motor such as rotation, acceleration, deceleration, positive rotation, reverse rotation and the like. With the development of technology, the dc brushless motor driver is miniaturized, highly integrated, high power density and intelligent, and in view of the above situation, a miniaturized, highly integrated and high power density motor driver is an urgent product in the current market.

Disclosure of Invention

The embodiment of the invention provides a motor driver which has the functions of high power density, miniaturized design, wide power coverage range and good universality and is suitable for the current market and industrial requirements.

In one aspect of the present invention, a motor driver is provided for driving and controlling a motor to rotate, so as to control a rotation speed and a rotation direction of the motor, and includes: the circuit comprises a voltage stabilizing circuit, an input circuit, a logic control circuit, a driving circuit and a three-phase bridge circuit; the voltage stabilizing circuit is used for converting an external input power supply into working voltage of the motor driver, supplying power to the input circuit, the logic control circuit and the driving circuit and supplying power to a Hall circuit of the motor, and the Hall circuit is used for detecting the rotating speed and the rotating direction of the motor and generating a first Hall signal; the input circuit is used for converting the first Hall signal into a second Hall signal and filtering the second Hall signal; the logic control circuit is used for logically controlling and processing the second Hall signal and outputting a logic signal for controlling the three-phase bridge circuit; the drive circuit is used for amplifying the current of the preceding-stage signal and realizing the grid drive of the switching tube; the three-phase bridge circuit is used for converting the direct-current voltage into the alternating-current voltage of the motor and outputting the alternating-current voltage to a three-phase winding of the motor; one output end of the voltage stabilizing circuit is electrically connected with the first input end of the input circuit, the first input end of the logic control circuit, the first input end of the driving circuit and the input end of the Hall circuit respectively, the second input end of the input circuit is electrically connected with the first Hall signal end, the output end of the input circuit is electrically connected with the second input end of the logic control circuit, the output end of the logic control circuit is electrically connected with the second input end of the driving circuit, one output end of the driving circuit is electrically connected with the input end of the three-phase bridge circuit unit, and the output end of the three-phase bridge circuit is electrically connected with the motor.

According to an embodiment of the present invention, the motor driver further includes: and the isolation circuit is used for isolating the speed regulating signal, the positive and negative rotation control signal and the internal circuit signal of the motor driver. The input end of the isolation circuit is electrically connected with the speed regulation signal end, the positive and negative rotation control signal end and the control signal ground end respectively, and the output end of the isolation circuit is electrically connected with the third input end of the logic control circuit.

The motor driver further includes: and the isolation circuit is used for converting the output level of the speed regulating signal and the positive and negative rotation control signal into an input level matched with the logic control circuit.

According to an embodiment of the present invention, the motor driver further includes: the overcurrent protection circuit is used for limiting the output current value of the motor driver within a first threshold range, the input end of the overcurrent protection circuit is electrically connected with one end of a sampling circuit of the motor driver, the output end of the overcurrent protection circuit is electrically connected with the fourth input end of the logic control circuit, and the sampling circuit is used for providing sampling current for the overcurrent protection circuit.

The overcurrent protection circuit judges whether the output current value of the motor driver is overcurrent or not by detecting the sampling resistance current value of the motor driver, and comprises: when the current value of the sampling resistor is larger than or equal to a first threshold value, the output end of the overcurrent protection circuit outputs a low level, and when the current value of the sampling resistor is smaller than the first threshold value, the output end of the overcurrent protection circuit outputs a high level.

The logic control circuit is further configured to output a logic signal for controlling the three-phase bridge circuit according to the output level of the overcurrent protection current and the speed regulation signal, and includes: and the output level of the overcurrent protection current and the speed regulation signal output a logic signal for controlling the three-phase bridge circuit through an AND logic gate circuit.

The invention provides a circuit structure based on a motor driver, wherein the motor driver comprises all the elements of the motor driver, the elements comprise a power tube element of a three-phase sampling circuit, a sampling resistance element, a voltage stabilizing circuit, an input circuit, a logic control circuit and elements of a driving circuit, and the circuit structure comprises: the second carrier substrate, first carrier substrate and metal casing, the second carrier substrate first carrier substrate adopts PCB board and ceramic copper-clad plate surface mounting respectively, parallel distribution in inside the metal casing, first carrier substrate with a metal casing bottom surface welded fastening, the parallel seam welding encapsulation of other bottom surfaces encapsulating of metal casing, three-phase sampling circuit's power tube component with the sampling resistance component is fixed in on the first carrier substrate, voltage stabilizing circuit, input circuit, logic control circuit, drive circuit's component are fixed in on the second carrier substrate.

According to an embodiment of the invention, the plate separation distance of the second carrier substrate from the first carrier substrate is in the range of (0-10) mm. The power tube is vacuum-welded on the ceramic copper-clad plate. The first carrier substrate and the second carrier substrate are welded through copper core binding posts and are interconnected through soft high-temperature wires.

The invention has the following beneficial effects: the motor driver disclosed by the invention adopts a high-power-density miniaturized design, is wide in coverage power range and universal in model, adopts multifunctional integration, effectively reduces peripheral devices and saves cost, is provided with an overcurrent protection circuit, is suitable for severe working conditions of sudden load change and frequent reversing, ensures the working reliability of the circuit, and can be used in a high-temperature environment and ensures the working stability by adopting the surface mounting of a PCB (printed circuit board) and a ceramic copper-clad plate.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a block diagram of a motor driver according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a three-phase bridge circuit disclosed in an embodiment of the present invention;

FIG. 3 is a block diagram of another motor driver according to an embodiment of the present invention;

FIG. 4 is a block diagram of another motor driver according to the present disclosure;

FIG. 5 is a schematic diagram of an over-current protection circuit according to an embodiment of the present invention;

FIG. 6 is a waveform diagram illustrating over-current protection according to an embodiment of the present invention;

fig. 7 is a schematic cross-sectional view of an internal structure of a motor driver according to an embodiment of the disclosure;

fig. 8 is a structural diagram of the first carrier substrate on the front side of the motor driver disclosed in the embodiment of the invention;

fig. 9 is a structural diagram of the second carrier substrate on the front surface of the motor driver disclosed in the embodiment of the invention.

With the foregoing drawings in mind, certain embodiments of the disclosure have been shown and described in more detail below. These drawings and written description are not intended to limit the scope of the disclosed concepts in any way, but rather to illustrate the concepts of the disclosure to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

The invention discloses a motor driver, which is used for driving and controlling a motor to rotate, changing the magnitude and direction of current flowing through a motor winding by controlling the on-off of an MOS (metal oxide semiconductor) tube, realizing the control of the rotating speed and the steering of the motor, and realizing the functions of accelerating, decelerating, positively rotating, reversely rotating and braking the motor, and comprises the following steps: the circuit comprises a voltage stabilizing circuit, an input circuit, a logic control circuit, a driving circuit and a three-phase bridge circuit; the voltage stabilizing circuit is used for converting an external input power supply into working voltage of the motor driver, supplying power to the input circuit, the logic control circuit and the driving circuit and supplying power to a Hall circuit of the motor, and the Hall circuit is used for detecting the rotating speed and the rotating direction of the motor and generating a first Hall signal; the input circuit is used for converting the first Hall signal into a second Hall signal and filtering the second Hall signal; the logic control circuit is used for logically controlling and processing the second Hall signal and outputting a logic signal for controlling the three-phase bridge circuit; the drive circuit is used for amplifying the current of the preceding-stage signal and realizing the grid drive of the switching tube; and the three-phase bridge circuit is used for converting the direct-current voltage into the alternating-current voltage of the motor and outputting the alternating-current voltage to a three-phase winding of the motor. One output end of the voltage stabilizing circuit is electrically connected with the first input end of the input circuit, the first input end of the logic control circuit, the first input end of the driving circuit and the input end of the Hall circuit respectively, the second input end of the input circuit is electrically connected with the first Hall signal end, the output end of the input circuit is electrically connected with the second input end of the logic control circuit, the output end of the logic control circuit is electrically connected with the second input end of the driving circuit, one output end of the driving circuit is electrically connected with the input end of the three-phase bridge circuit, and the output end of the three-phase bridge circuit unit is electrically connected with the motor.

The motor driver adopts an upper plate and a lower plate overlapping welding mode, a power part adopts a Si3N4 copper-clad substrate structure, and a control part adopts a PCB structure.

The product adopts a microcircuit module process, the surface of a PCB and a Si3N4 copper-clad plate is pasted, and a metal shell is packaged.

The circuit is provided with two power supplies for power supply, one is a power supply V + (56V), and the other is a control power supply V CC (15V); five paths of input signals, wherein three paths of Hall signals are input, one path of speed regulation control signal is input, and the other path of forward and reverse rotation control signal is input; one output power supply Vout (12V) supplies power for the Hall of the motor; and three paths of power supply outputs are U, V, W three phases respectively.

The circuit is designed in a schematic block diagram mode, and is shown in figure 1. The voltage stabilizing circuit, the input circuit, the logic control circuit, the driving circuit and the three-phase bridge circuit in fig. 1 are circuit units corresponding to the voltage stabilizing circuit, the input circuit, the logic control circuit, the driving circuit and the three-phase bridge circuit respectively.

One output end of the voltage stabilizing circuit is electrically connected with the first input end of the input circuit, the first input end of the logic control circuit, the first input end of the driving circuit and the input end of the Hall circuit respectively, the second input end of the input circuit is electrically connected with the Hall signal, the output end of the input circuit is electrically connected with the second input end of the logic control circuit, the output end of the logic control circuit is electrically connected with the second input end of the driving circuit, one output end of the driving circuit is electrically connected with the input end of the three-phase bridge circuit unit, and the output end of the three-phase bridge circuit is electrically connected with the motor.

The voltage stabilizing circuit has the function of converting an externally input power supply into working voltage, and the working voltage of a related circuit can be set automatically according to specific engineering or operation requirements, so that voltage is provided for the related circuit, and power is supplied to a Hall circuit of the brushless motor. The main components include triode, voltage stabilizing diode, resistor and capacitor.

The input circuit has the function of converting Hall signals generated by the motor and filtering the Hall signals. The Hall circuit is used for detecting the rotating speed and the rotating direction of the motor to generate a first Hall signal, and the input circuit is used for converting the first Hall signal into a second Hall signal and filtering the second Hall signal; the main components are composed of a resistor, a capacitor and a diode. The resistor is a pull-up resistor and is used for providing current for a motor Hall device, and the resistance-capacitance element is used for filtering an externally input Hall signal and filtering spike burrs. The diode is used for anti-static protection and anti-static design of the leading-out port.

The logic control circuit HAs the function of carrying out logic control processing on three Hall signals HA, HB and HC, a speed regulating signal PWM and a forward and reverse switching signal F/R. And finally, outputting six paths of logic signals (AHO, BHO, CHO, ALO, BLO and CLO) capable of controlling the conduction of the three-phase bridge MOS tubes. The forward and reverse rotation of the motor is controlled by changing the F/R signal, the speed regulation of the motor is controlled by changing the duty ratio of the PWM signal, and the GL signal is an overcurrent protection signal. The main components are composed of a capacitor and a gate circuit. The forward and reverse rotation control realization principle: when the pin at the F/R end is at high level, the motor rotates clockwise, and when the pin at the F/R end is at low level, the motor rotates anticlockwise. The PWM speed regulation realization principle is as follows: when the duty ratio of the input signal of the PWM end is larger, the rotating speed of the motor is increased; when the duty ratio of the input signal of the PWM end is smaller, the rotating speed of the motor is reduced.

The function of the driving circuit is to amplify the current of the preceding stage signal and realize the gate drive of the MOS tube. The gate driving of the high-side MOS tube or the gate driving of the low-side MOS tube can be realized according to actual requirements. Taking the gate drive of the high-side MOS transistor as an example, since the six signals output by the logic control circuit have limited current supply, and the high-side MOS transistor has low drive voltage, and cannot directly drive the three-phase bridge circuit, the preceding-stage output signal needs to be amplified and level-boosted by the drive circuit. The high-side driver of the circuit is realized by adopting a mature bootstrap circuit.

And the three-phase bridge circuit unit is used for converting the direct-current voltage into alternating-current voltage which can be identified by the motor and outputting the alternating-current voltage to a three-phase winding of the motor. As shown in fig. 2, the main elements include 6 power MOS transistors, Q1 and Q2 form a U-phase arm, Q3 and Q4 form a V-phase arm, and Q5 and Q6 form a W-phase arm. The D pole of the high-end power MOS tube of the upper bridge arm is connected to the positive end of the power supply, and the S pole of the low-end power MOS tube of the lower bridge arm is connected to the negative end of the power supply through a sampling resistor.

According to an embodiment of the present invention, as shown in fig. 3, the motor driver further includes: the isolation circuit is used for isolating a speed regulation signal, a forward and reverse rotation control signal and a circuit signal inside the motor driver, the input end of the isolation circuit is electrically connected with a speed regulation signal end, a forward and reverse rotation control signal end and a control signal ground end respectively, and the output end of the isolation circuit is electrically connected with the third input end of the logic control circuit.

The motor driver further includes: and the isolation circuit is used for converting the output level of the speed regulating signal and the positive and negative rotation control signal into an input level matched with the logic control circuit.

The isolation circuit has the functions of isolating the PWM speed regulating signal and the F/R forward and reverse rotation control signal from a power circuit in the motor driver, preventing the power circuit from interfering with the PWM and F/R signals input from the outside, preventing the motor from misoperation and improving the reliability of a control system. The isolation circuit is also used for converting the output level of the speed regulating signal and the positive and negative rotation control signal into an input level matched with the logic control circuit. The brushless motor driver direction control signal F/R, PWM is the output signal of the whole system, the output signal is the TTL signal, and the logic processing circuit supplies power Vcc of 12V, so the isolation circuit not only has the isolation function, but also has the level conversion function. And the logic control circuit is also used for controlling and processing the speed regulating signal and the forward and reverse switching signal and outputting a logic signal for controlling the three-phase bridge circuit.

The isolation circuit has the functions of isolating the PWM speed regulating signal and the F/R forward and reverse rotation control signal from a power circuit in the motor driver, preventing the power circuit from interfering with the PWM and F/R signals input from the outside, preventing the motor from misoperation and improving the reliability of a control system.

According to an embodiment of the present invention, as shown in fig. 4, the motor driver further includes: and the overcurrent protection circuit is used for limiting the output current value of the motor driver to be within a first threshold range. The functions symbolized by the terminals in fig. 4 are as shown in table 1, and are consistent with the symbolized functions in fig. 1 and 3, and are as follows:

TABLE 1

And the overcurrent protection circuit is used for limiting the output current value of the motor driver to be within a first threshold range. The function of the over-current protection circuit is to limit the motor driver output current to a maximum value. The principle is that the current on the sampling resistor is filtered and compared, and then a level signal is output to a logic control circuit.

The overcurrent protection circuit is used for limiting the output current value of the motor driver within a first threshold range, the input end of the overcurrent protection circuit is electrically connected with one end of a sampling circuit of the motor driver, the output end of the overcurrent protection circuit is electrically connected with the fourth input end of the logic control circuit, and the sampling circuit is used for providing sampling current for the overcurrent protection circuit. The overcurrent protection circuit judges whether the output current value of the motor driver is overcurrent or not by detecting the sampling resistance current value of the motor driver, and comprises the following steps: when the current value of the sampling resistor is larger than or equal to a first threshold value, the output end of the overcurrent protection circuit outputs a low level, and when the current value of the sampling resistor is smaller than the first threshold value, the output end of the overcurrent protection circuit outputs a high level.

The logic control circuit outputs a logic signal for controlling the three-phase bridge circuit according to the output level of the overcurrent protection current and the speed regulation signal, and the logic control circuit comprises: and the output level of the overcurrent protection current and the speed regulation signal output a logic signal for controlling the three-phase bridge circuit through an AND logic gate circuit.

As shown in FIG. 5, U8-A in the circuit is a comparator, and the working voltage is 12V. R19, R20 and C16 constitute reference sources. C15 is the filter capacitance of the comparator. R17 is the pull-up resistance of the comparator. R18 is the feedback resistance of the comparator. C14 is the output filter capacitance. R46 is a current sampling resistor. R33 and C23 form an RC filter circuit. When the circuit is not over-current, the voltage at the two ends of the R46 is compared with the reference voltage of the pin 3 of the comparator U8-A, the comparator is not overturned, the output of the pin 1 is high level 12V, and the circuit only chops the input PWM wave. When overcurrent occurs in the circuit, the voltage at the two ends of the R46 is compared with the reference voltage of the pin 3 of the comparator U8-A, the comparator is overturned, the output of the pin 1 is low level, and the output signal of the low level and the PWM signal is low level after passing through an AND logic gate circuit. The output end of the driving circuit outputs a low level signal, the MOS tube is turned off, the output current is reduced, the cycle forms a closed control, and the input and output waveform diagrams of the comparator U8-A1 pin, the comparator U8-A2 pin and the comparator U8-A3 pin are shown in detail in figure 6. The output overcurrent protection circuit is not in operation only when the driver is in a non-overcurrent condition. The sampling circuit is a resistor with a ground terminal in fig. 1, 3 and 4. U8-B is spare comparator in the circuit, and when the trouble appears in U8-A comparator, replace it in time, avoid influencing the normal output of follow-up circuit and whole motor drive. The chopping phenomenon of the voltage causes the effective current to be reduced, so that the circuits at two ends of the sampling resistor are reduced.

In order to avoid the burning of the driving module and reduce the pulse peak current, the other aspect is to realize good heat dissipation and further improve the power density by selecting materials and optimizing the structure design, the design adopts the surface mounting of a PCB (printed circuit board) and a ceramic copper-clad plate, the glue filling parallel seam welding packaging of a metal shell 702, the high-voltage large-current low-on resistance power tube is adopted, the structure and the process design adopt a multi-layer wiring technology to improve the assembly and wiring density, the structure is divided into a power part and a non-power part, the power part (a power tube and a sampling resistor) adopts a silicon nitride ceramic copper-clad substrate to place elements (the heat dissipation and the heat conductivity are very good), the non-power part adopts a PCB to place elements for signal processing, in order to reduce the volume of the product and realize high-density assembly, the interior of the product adopts an upper-layer structure design and a lower-layer structure design, and the internal structure diagram is shown in fig. 7. The elements of the motor driver comprise power tube elements of a three-phase sampling circuit, the sampling resistance element, the voltage stabilizing circuit, the input circuit, the logic control circuit and elements of the driving circuit, and the circuit structure comprises: the second carrier substrate 703, first carrier substrate 701 and metal casing 702, the second carrier substrate 703 the first carrier substrate 701 adopts PCB board and ceramic copper-clad plate surface mounting respectively, parallel distribution is in inside the metal casing, first carrier substrate 701 with a bottom surface encapsulating parallel seam welding of metal casing 702 is fixed, the parallel seam welding encapsulation of other bottom surfaces encapsulating of metal casing 702, the power tube component of three-phase sampling circuit with the sampling resistance component is fixed in on the first carrier substrate 701, voltage stabilizing circuit, input circuit, logic control circuit, drive circuit's component are fixed in on the second carrier substrate 703.

And the power tube is vacuum-welded on the ceramic copper-clad plate. The first carrier substrate and the second carrier substrate are welded through copper core binding posts and are interconnected through soft high-temperature wires.

The distance range between the first carrier substrate 701 and the second carrier substrate 703 is (0-10) mm, the plate length ranges of the first carrier substrate 701 and the second carrier substrate 703 are (40-42) mm, the plate width ranges of the first carrier substrate 701 and the second carrier substrate 703 are (35-40) mm, and the plate height ranges of the first carrier substrate 701 and the second carrier substrate 703 are (30-35) mm. The method is not limited to the size range given above, and can be set in a self-matching mode according to actual engineering requirements.

As shown in fig. 8, the first carrier substrate 701 is used to mount a power pin 701(a) and a power MOS transistor 701 (b).

As shown in fig. 9, the second carrier substrate 703 is used to house control pins 703(a), and to house elements 703(b) of the driver, isolation and logic control circuits.

The invention has the following beneficial effects: the motor driver disclosed by the invention adopts a high-power-density miniaturized design, is wide in coverage power range and universal in model, adopts multifunctional integration, effectively reduces peripheral devices and saves cost, is provided with an overcurrent protection circuit, is suitable for severe working conditions of sudden load change and frequent reversing, ensures the working reliability of the circuit, and can be used in a high-temperature environment and ensures the working stability by adopting the surface mounting of a PCB (printed circuit board) and a ceramic copper-clad plate.

It should be understood that the above-described embodiments are merely exemplary for illustrating the application of the present method and are not limiting, and that various other modifications and changes may be made by those skilled in the art based on the above description for studying the related problems. Therefore, the protection scope of the present invention should be defined by the appended claims.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. 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.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.