Motor driving chip, motor and automobile injection molding equipment

Abstract

The invention relates to the field of integrated circuits, in particular to a motor driving chip which comprises a configuration unit used for configuring the resistance value of a first resistor according to injection molding parameters; the detection unit is used for detecting the resistance value of a configured resistor and outputting a first detection signal; the analog-to-digital conversion unit is electrically connected with the detection unit and is used for converting the first detection signal into a first digital signal; the driving unit is controlled by the first digital signal to work in a first driving mode or a second driving mode; wherein the first driving mode refers to that the driving unit is a three-phase full-bridge driving circuit composed of six NMOS (N-channel Metal Oxide Semiconductor); and the second driving mode refers to that the driving unit is a three-phase full-bridge driving circuit composed of three NMOS (N-channel Metal Oxide Semiconductor) and three PMOS (P-channel Metal Oxide Semiconductor). The problem that an existing motor driving chip cannot be compatible with various working conditions can be solved, the motor driving chip can be suitable for various injection molding scenes, stability and reliability are improved, and cost is saved.

Description

Technical Field

[0001] The present invention relates to the field of integrated circuits, and in particular to a motor drive chip, a motor and an automobile injection molding device. Background Art

[0002] The motor driver chip is a power electronic component composed of metal oxide semiconductor field effect transistors. At present, the motor driver chip mainly has a three-phase full-bridge circuit composed of six NMOS tubes (power semiconductor devices, N-type metal-oxide-semiconductors) or a three-phase full-bridge circuit composed of three NMOS tubes and three PMOS (power semiconductor devices, P-type metal-oxide-semiconductors). Among them, the method of using six NMOS tubes to control the motor driver chip is mainly used in high current scenarios; while the method of using three NMOS tubes and three PMOS is mainly used in low current scenarios. When a single motor driver chip is used for control, it cannot meet the requirements of different working conditions.

[0003] Molding machine tools are intelligent manufacturing equipment. With the rapid development of new energy vehicles in recent years, the efficiency, compatibility, and cost of automotive injection molding equipment have been increasingly considered. The drive of injection molding equipment requires a motor driver chip, but due to differences in the size and shape of injection molded parts and the characteristics of injection molding materials, different types of motor driver chips are often required. With the current market demand for diversified injection molding products and considerations for injection molding costs, there is an urgent need for a universal motor driver chip that can be compatible with different injection molding scenarios to reduce the cost of injection molding equipment while improving the versatility of molding.

[0004] In addition, when the existing driver chip fails, there is no backup circuit and the machine has to be shut down for processing. The reliability of the driver circuit is poor, which seriously affects the production efficiency of the enterprise. At the same time, for motor driver chips, customers are increasingly inclined to thinner and lighter chips, which puts higher requirements on the area and volume of driver chips.

[0005] The above problems have become issues that need to be solved urgently. Summary of the invention

[0006] The present invention discloses a motor driver chip, a motor and an automobile injection molding device. A switching unit is used to select a suitable drive circuit to adapt to a corresponding injection molding scene, thereby improving the compatibility of the motor driver chip and saving costs. By setting an adjustable first resistor, changes in the injection molding scene can be automatically monitored in real time, and the drive circuit can be adjusted in real time to enhance the stability of the drive circuit. The resistance value can also be set manually, thereby improving the flexibility and convenience of equipment control.

[0007] The technical solution adopted by the present invention to solve the above technical problems is: Based on the above purpose, the present invention discloses a motor driving chip, a motor and an automobile injection molding device, including: a configuration unit, a detection unit, an analog-to-digital conversion unit, and a driving unit.

[0008] A configuration unit, configured to configure the resistance value of the first resistor according to the injection molding parameters; A detection unit, used to detect the resistance value of the first resistor and output a first detection signal; an analog-to-digital conversion unit, electrically connected to the detection unit, and configured to convert the first detection signal into a first digital signal; A driving unit, controlled by a first digital signal to work in a first driving mode or a second driving mode; The first driving mode refers to a driving unit that is a three-phase full-bridge driving circuit composed of six NMOSs; the second driving mode refers to a driving unit that is a three-phase full-bridge driving circuit composed of three NMOSs and three PMOSs.

[0009] In some embodiments, the driving unit further includes: a switching unit, a first driving sub-unit, and a second driving sub-unit; A switching unit, controlled by a first digital signal to enable the first driving subunit or the second driving subunit so that the motor driving chip operates in the first driving mode or the second driving mode; The first driving subunit is a three-phase full-bridge driving circuit composed of six NMOSs; the second driving subunit is a three-phase full-bridge driving circuit composed of three NMOSs and three PMOSs.

[0010] In some embodiments, the switching unit includes a first switch and a second switch, and the first driving subunit and the second driving subunit are connected to the power supply via the first switch and the second switch respectively; The first driver unit includes three parallel first branches, and the second driver unit includes three parallel second branches; each first branch includes a first NMOS and a second NMOS connected in series, and each second branch includes a first PMOS transistor and a third NMOS transistor connected in series.

[0011] In some embodiments, the motor driver chip also includes three connection points of the first NMOS and the second NMOS of the three parallel first branches and three connection points of the first PMOS tube and the third NMOS tube of the three parallel second branches are respectively connected through a third switch, a fourth switch, and a fifth switch.

[0012] In some embodiments, the motor driving chip further includes a selection unit (100, 200, 300); The selection unit is electrically connected to three connection points of the first NMOS and the second NMOS of the three parallel first branches and three connection points of the first PMOS tube and the third NMOS tube of the three parallel second branches, and is used to select one or more third NMOS tubes as backup MOS tubes when one or more second NMOS tubes are open, or to select one or more first NMOS tubes as backup MOS tubes when one or more third NMOS tubes are open.

[0013] In some embodiments, the motor driver chip further includes a fault detection circuit; The fault detection circuit is controlled by the first digital signal or the switch states of the first switch and the second switch to perform fault detection on the three second NMOS tubes or the three third NMOS tubes.

[0014] In some embodiments, the driving unit includes: a switching unit, a first high-side driving unit, a second high-side driving unit, and a first low-side driving unit; A switching unit, controlled by a first digital signal to enable the first high-side driving unit or the second high-side driving unit; Among them, when the first high-side drive unit is enabled, it constitutes a first drive sub-unit with the first low-side drive unit, and when the second high-side drive unit is enabled, it constitutes a second drive sub-unit with the first low-side drive unit; the first drive sub-unit is a three-phase full-bridge drive circuit composed of six NMOS; the second drive sub-unit is a three-phase full-bridge drive circuit composed of three NMOS and three PMOS.

[0015] In some embodiments, the switching unit includes a first switch and a second switch controlled by a first digital signal, the first high-side driving unit includes three first NMOS transistors, the first low-side driving unit includes three second NMOS transistors, and the second high-side driving unit includes three first PMOS transistors; Among them, the three first NMOS tubes are connected to the power supply after passing through the first switch, and the three first NMOS tubes are connected in series with the three second NMOS tubes one by one and then grounded; among them, the three first PMOS tubes are connected to the power supply after passing through the second switch, and the three first PMOS tubes are connected in series with the three second NMOS tubes one by one and then grounded.

[0016] In some embodiments, the injection molding parameters of the motor driver chip include at least one of a mold cavity volume and injection material fluidity.

[0017] In some embodiments, the motor driver chip further includes a parameter detection unit; The parameter detection unit detects the volume of the mold cavity and / or the fluidity of the injection material in real time, and adjusts the resistance value of the first resistor in real time according to the detection result.

[0018] In a second aspect, the present application provides a motor, comprising the motor driver chip of the first aspect.

[0019] In a third aspect, the present application provides an automotive injection molding device, including a mold, a barrel, a rotating rod, a discharging device, a hydraulic device and the motor drive chip of the second aspect.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The appropriate drive circuit can be switched in real time according to the changes in the injection molding scene, that is, the motor drive chip of the present application can adapt to different injection molding scenes and has high compatibility; The driving circuit of the present application is compatible with different scenarios and can save injection molding costs; The resistance value of the first resistor can be adjusted according to the real-time monitored injection molding parameters, or can be manually configured, thereby ensuring the real-time and accuracy of the injection molding equipment while taking into account the flexibility of adjustment; By reusing some MOS tubes, the area of ​​the motor driver chip can be reduced to a certain extent; By providing separate lower tubes for the two driving sub-units, the two parts can serve as backup for each other, thereby improving the reliability and stability of the driving circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a motor driving chip disclosed in an embodiment of the present invention is shown; Figure 2 A schematic diagram of a driving unit disclosed in an embodiment of the present invention is shown; Figure 3 The circuit diagram of the driving unit disclosed in one embodiment of the present invention is shown. Figure 1 ; Figure 4 The circuit diagram of the driving unit disclosed in one embodiment of the present invention is shown. Figure 2 ; Figure 5 The circuit diagram of the driving unit disclosed in one embodiment of the present invention is shown. Figure 3 ; Figure 6 A schematic diagram of a selection unit disclosed in an embodiment of the present invention is shown; Figure 7 The circuit diagram of the driving unit disclosed in one embodiment of the present invention is shown. Figure 4 ; Figure 8 The circuit diagram of the driving unit disclosed in one embodiment of the present invention is shown. Figure 5 .

[0022] In the figure: 10-motor driver chip, 1-configuration unit, 2-detection unit, 3-analog-to-digital conversion unit, 4-drive unit, 41-switching unit, 42-first drive sub-unit, 43-second drive sub-unit, 20-selection unit, 100-first selection unit, 200-second selection unit, 300-third selection unit, 421-first high-side drive unit, 422-first low-side drive unit, 431-second high-side drive unit. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below through specific implementation examples in conjunction with the accompanying drawings.

[0024] See also Figure 1 The embodiment of the present invention discloses a motor driving chip 10, which includes: a configuration unit 1, a detection unit 2, an analog-to-digital conversion unit 3, and a driving unit 4.

[0025] Configuration unit 1, used to configure the resistance value of the first resistor R according to the injection molding parameters; A detection unit 2, used for detecting the resistance of the first resistor R and outputting a first detection signal DET1; The analog-to-digital conversion unit 3 is electrically connected to the detection unit 2 and is used to convert the first detection signal DET1 into a first digital signal P[0:1]; The driving unit 4 is controlled by the first digital signal P[0:1] and operates in the first driving mode or the second driving mode; The first driving mode refers to that the driving unit 4 is a three-phase full-bridge driving circuit composed of six NMOSs; the second driving mode refers to that the driving unit 4 is a three-phase full-bridge driving circuit composed of three NMOSs and three PMOSs.

[0026] In this embodiment, the resistance value of the first resistor R is related to the value of the injection molding parameters, that is, different injection molding parameters will affect the resistance value of the first resistor R. By detecting the resistance value of the first resistor R, information characterizing the injection molding parameters can be obtained, and a suitable motor driver chip can be selected based on this information. In other words, in this embodiment, by setting an adjustable first resistor, the changes in the injection molding scene can be monitored in real time, the drive circuit can be adjusted in real time, and the system stability can be enhanced; by selecting a suitable drive circuit to adapt to the corresponding injection molding scene through the switching unit, the compatibility of the motor driver chip is improved.

[0027] In some embodiments, the motor driver chip 10 further includes a parameter detection unit; The parameter detection unit detects the volume of the mold cavity and / or the fluidity of the injection material in real time, and adjusts the resistance value of the first resistor in real time according to the detection result.

[0028] In the present application, the injection molding parameters are parameters that may affect the selection of the drive circuit, such as at least one of the mold cavity volume and the fluidity of the injection molding material. For example, when the mold cavity volume is large and / or the fluidity of the injection molding material is small, it is best to select a three-phase full-bridge drive circuit composed of six NMOS.

[0029] In the present application, the resistance value of the first resistor can be adjusted according to the real-time monitored injection molding parameters, or the resistance value of the first resistor can be adjusted manually according to the injection molding parameters. In this case, the priority of adjustment or manual adjustment can be configured.

[0030] Exemplarily, the priority of the adjustment can be configured to be higher than that of the manual adjustment. In this case, if the adjustment function is turned on, the result of the adjustment shall prevail.

[0031] Exemplarily, the priority of the adjustment can be configured to be lower than that of the manual adjustment. In this case, if the adjustment function is turned on and there is manual intervention in the adjustment, the result of the manual adjustment shall prevail.

[0032] In the present application, the resistance value of the first resistor R is detected by detecting current or voltage.

[0033] Exemplarily, the detection unit 2 may detect the resistance value of the first resistor R by applying a fixed voltage to the first resistor R and detecting the current DET1 flowing through the first resistor R.

[0034] Exemplarily, the detection unit 2 can detect the resistance value of the first resistor R by applying a fixed current to the first resistor R and detecting the voltage DET1 across the first resistor R.

[0035] In the present application, the analog-to-digital conversion unit 3 is used to convert the analog first detection signal DET1 representing the resistance value of the first resistor R obtained by the detection unit 2 into a first digital signal P[0:1], so as to control the drive unit 4 to select the working mode corresponding to the current injection molding parameters.

[0036] See also Figure 2 , in some embodiments, the driving unit 4 further includes: a switching unit 41, a first driving sub-unit 42, and a second driving sub-unit 43; The switching unit 41 is controlled by the first digital signal P[0:1] to enable the first driving subunit 42 or the second driving subunit 43 so that the motor driving chip 10 works in the first driving mode or the second driving mode; The first driving subunit 42 is a three-phase full-bridge driving circuit composed of six NMOSs; the second driving subunit 43 is a three-phase full-bridge driving circuit composed of three NMOSs and three PMOSs.

[0037] In this embodiment, the switch unit 41 is controlled by the first digital signal P[0:1] to output the first enable signal EN1 or the second enable signal EN2 to enable the first driver unit 42 through the first enable signal EN1 or enable the second driver unit 43 through the second enable signal EN2.

[0038] See also Figure 3 In some embodiments, the switching unit 41 includes a first switch S1 and a second switch S2, and the first driving subunit 42 and the second driving subunit 43 are connected to the power supply VDD via the first switch S1 and the second switch S2 respectively; The first driver unit 42 includes three parallel first branches, and the second driver unit 43 includes three parallel second branches; each first branch includes a first NMOS (for example, N1, N3, N5) and a second NMOS (for example, N2, N4, N6) connected in series, and each second branch includes a first PMOS tube (for example, P1, P2, P3) and a third NMOS tube (for example, N7, N8, N9) connected in series.

[0039] In this embodiment, the switching unit includes two switches, which are turned on and off by the first digital signal P[0:1], so as to determine which one of the first driving sub-unit 42 and the second driving sub-unit 43 is enabled.

[0040] Exemplarily, when P[0]=1, S1 is closed, the first driver subunit 42 is connected to the power supply VDD, and the first driver subunit 42 is enabled; when P[0]=0, S1 is disconnected, the first driver subunit 42 is disconnected from the power supply VDD, and the first driver subunit 42 is not enabled; when P[1]=1, S2 is closed, the second driver subunit 43 is connected to the power supply VDD, and the second driver subunit 43 is enabled; when P[1]=0, S2 is disconnected, the second driver subunit 43 is disconnected from the power supply VDD, and the second driver subunit 43 is not enabled.

[0041] See also Figure 4-Figure 6 , in some embodiments, the motor driver chip 10 further includes a selection unit 20; The selection unit 20 is electrically connected to three connection points of the first NMOS and the second NMOS of the three parallel first branches (for example, A1, A2, A3, respectively connected to the motor windings) and three connection points of the first PMOS tube and the third NMOS tube of the three parallel second branches (for example, B1, B2, B3, respectively connected to the motor windings), and is used to select one or more third NMOS tubes as backup MOS tubes when one or more second NMOS tubes are open, or to select one or more first NMOS tubes as backup MOS tubes when one or more third NMOS tubes are open.

[0042] For example, see Figure 5 When any second NMOS of the first driver unit 42 fails (assuming that the first driver unit 42 is enabled at this time), one or more third NMOS of the second driver unit 43 can be arbitrarily selected as replacements; for example, if N2 fails, one or more of S11, S12, and S13 can be closed.

[0043] For example, see Figure 5 and Figure 6 When any third NMOS of the second driver unit 43 fails (assuming that the second driver unit 43 is enabled at this time), one or more second NMOS of the first driver unit 42 can be arbitrarily selected as replacements; for example, when N8 fails, one or more of S12, S22, and S33 can be closed.

[0044] For example, see Figure 4 The three connection points (e.g., A1, A2, A3) of the first NMOS (e.g., N1, N3, N5) and the second NMOS (e.g., N2, N4, N6) of the three parallel first branches are connected to the three connection points (e.g., B1, B2, B3) of the first PMOS (e.g., P1, P2, P3) and the third NMOS (e.g., N7, N8, N9) of the three parallel second branches through the third switch S3, the fourth switch S4, and the fifth switch S5, respectively.

[0045] In this embodiment, the second NMOS tube in any first branch of the first driver unit 42 and the third NMOS tube in a second branch of the second driver unit 43 are backed up for each other. For example, when it is determined that the first driver unit 42 needs to be started according to the injection molding parameters, S1 is closed and S2 is disconnected. Assuming that a fault is detected in a second NMOS tube (for example, N2 cannot be closed) through the fault detection circuit at this time, the first driver unit 42 will not be able to drive the motor to work normally, causing the injection molding equipment to be unable to complete the injection molding task.

[0046] For example, since N7 and N2 are backup for each other in this solution, at this time, S3 can be turned on in response to the control signal of the fault detection circuit, and the third MOS tube N7 is used to replace the second MOS tube N2 to work. The same is true for the situation where N4, N6, N7, N8, and N9 cannot be used, which will not be described here. It should be noted that in this case, the PWM signal originally input to N2 will be input to the control end of N7.

[0047] For example, S3, S4, and S5 can be closed at any time. Different from the previous example, in this example, even if a certain tube cannot be closed during operation, the drive circuit can still work normally. For example, N2 cannot be closed, and N7 can still work normally at this time.

[0048] In some implementations, the motor driver chip further includes: a fault detection circuit; The fault detection circuit is controlled by the first digital signal or the switch states of the first switch and the second switch to perform fault detection on the three second NMOS transistors or the three third NMOS transistors.

[0049] For example, the fault detection circuit may be enabled to perform fault detection on the first driving sub-unit 42 or the second driving sub-unit 43 according to the first digital signal P[0:1].

[0050] For example, when P[0]=1, S1 is closed, and the first driver unit 42 is enabled to drive the motor to rotate. At this time, the fault detection circuit will be controlled by P[0]=1 to perform fault detection on the first driver unit 42. At the same time, since P[1]=0, S2 is open, and the fault detection circuit will not perform fault detection on the second driver unit 43.

[0051] For another example, when P[0]=0, S1 is disconnected, and the first driver unit 42 will be disabled. At this time, P[0]=0, no fault detection is performed on the first driver unit 42, and at the same time, since P[1]=1, S2 is closed, the fault detection circuit will perform fault detection on the second driver unit 43.

[0052] It should be noted that in the present application, S1 and S2 will not be closed at the same time. That is, only one of the first driver unit 42 and the second driver unit 43 will be enabled to drive the motor. Therefore, the fault detection circuit will only perform fault detection on one of the first driver unit 42 and the second driver unit 43 at the same time.

[0053] In some implementations, the fault detection circuit determines which driver unit to perform fault detection on according to the switch states of the first switch and the second switch. Specifically, the first driver unit 42 or the second driver unit 43 can be determined to perform fault detection on the first driver unit 42 or the second driver unit 43 according to the potential at the connection point between the first driver unit 42 and the first switch S1 and the potential at the connection point between the second driver unit 43 and the second switch S2. It should be noted that when the switch is closed, the drain potential of the MOS tube connected to the switch will become higher.

[0054] In some embodiments, see Figure 7 , the driving unit 4 includes: a switching unit 41, a first high-side driving unit 421, a second high-side driving unit 431, and a first low-side driving unit 422; The switching unit 41 is controlled by the first digital signal P[0:1] to enable the first high-side driving unit 421 or the second high-side driving unit 431; Among them, when the first high-side drive unit 421 is enabled, it constitutes the first drive sub-unit 42 with the first low-side drive unit 422, and when the second high-side drive unit 431 is enabled, it constitutes the second drive sub-unit 43 with the first low-side drive unit 422; the first drive sub-unit 42 is a three-phase full-bridge drive circuit composed of six NMOS; the second drive sub-unit 43 is a three-phase full-bridge drive circuit composed of three NMOS and three PMOS.

[0055] Different from Figure 2-6 In the driving circuit of this embodiment, two driving sub-units share the low-side NMOS tube. Although the mutual backup function is sacrificed and the system reliability is reduced, multiple NMOS tubes are saved and the chip area is greatly reduced.

[0056] In this embodiment, the first low-side drive unit 422 can be reused. When a three-phase full-bridge drive circuit composed of six NMOS is required, the first low-side drive unit 422 cooperates with the first high-side drive unit 421 to form the three-phase full-bridge drive circuit. When a three-phase full-bridge drive circuit composed of three NMOS and three PMOS is required, the first low-side drive unit 422 cooperates with the second high-side drive unit 431 to form the three-phase full-bridge drive circuit. In other words, according to the actual working conditions (mold cavity volume, injection material properties (fluidity, friction coefficient, etc.), it can be determined which drive circuit is needed, thereby determining which high-side drive unit to enable.

[0057] In some embodiments, see Figure 7 , the switching unit 41 includes a first switch S1 and a second switch S2 controlled by a first digital signal P[0:1], the first high-side driving unit 421 includes three first NMOS transistors, the first low-side driving unit 422 includes three second NMOS transistors, and the second high-side driving unit 431 includes three first PMOS transistors; Among them, the three first NMOS tubes are connected to the power supply through the first switch S1, and the three first NMOS tubes are connected in series with the three second NMOS tubes one by one and then grounded; among them, the three first PMOS tubes are connected to the power supply through the second switch S2, and the three first PMOS tubes are connected in series with the three second NMOS tubes one by one and then grounded.

[0058] In some implementations, in order to avoid affecting the source potential of another high-side driving unit when a certain driving sub-unit is working, so that the affected high-side driving unit may not be able to achieve the expected state when it is put into use, switches S3-S5 can be set to disconnect P1 and N2, P2 and N4, and P3 and N6. Figure 8 Switches may also be provided to disconnect N1 from N2, N3 from N4, and N5 from N6 (not shown in the figure).

[0059] In a second aspect, the present application provides a motor, including the motor driver chip provided in the first aspect.

[0060] In a third aspect, the present application provides an automobile injection molding device, including a mold, a barrel, a screw, a discharging device, a hydraulic device and the motor of the second aspect.

[0061] However, it should be understood that the above embodiments of the present invention are only used for examples and explanations, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A motor driver chip, characterized in that: include: A configuration unit, configured to configure the resistance value of the first resistor according to the injection molding parameters; A detection unit, used to detect the resistance value of the first resistor and output a first detection signal; an analog-to-digital conversion unit, electrically connected to the detection unit, and configured to convert the first detection signal into a first digital signal; A driving unit, controlled by the first digital signal to work in a first driving mode or a second driving mode; The first driving mode refers to a driving unit that is a three-phase full-bridge driving circuit composed of six NMOSs; the second driving mode refers to a driving unit that is a three-phase full-bridge driving circuit composed of three NMOSs and three PMOSs.

2. The motor driver chip according to claim 1, characterized in that: include: A switching unit, a first driving subunit, and a second driving subunit; The switching unit is controlled by the first digital signal to enable the first driving sub-unit or the second driving sub-unit; The first driving subunit is a three-phase full-bridge driving circuit composed of six NMOSs; the second driving subunit is a three-phase full-bridge driving circuit composed of three NMOSs and three PMOSs.

3. The motor driver chip according to claim 2, characterized in that: The switching unit includes a first switch and a second switch, and the first driving sub-unit and the second driving sub-unit are connected to a power source via the first switch and the second switch respectively; The first driver unit includes three parallel first branches, and the second driver unit includes three parallel second branches; each first branch includes a first NMOS and a second NMOS connected in series, and each second branch includes a first PMOS tube and a third NMOS tube connected in series.

4. The motor driving chip according to claim 3, characterized in that: Also includes: Select unit; The selection unit is electrically connected to the three connection points of the first NMOS and the second NMOS of the three parallel first branches and the three connection points of the first PMOS tube and the third NMOS tube of the three parallel second branches, and is used to select one or more of the third NMOS tubes as backup MOS tubes when one or more of the second NMOS tubes are open, or to select one or more of the first NMOS tubes as backup MOS tubes when one or more of the third NMOS tubes are open.

5. The motor driver chip according to claim 4, characterized in that: Also includes: Fault detection circuit; The fault detection circuit is controlled by the first digital signal or the switch states of the first switch and the second switch to perform fault detection on the three second NMOS transistors or the three third NMOS transistors.

6. The motor driver chip according to claim 1, characterized in that: The motor drive unit comprises: a switching unit, a first high-side drive unit, a second high-side drive unit, and a first low-side drive unit; The switching unit is controlled by the first digital signal to enable the first high-side driving unit or the second high-side driving unit; Among them, when the first high-side drive unit is enabled, it constitutes a first drive sub-unit with the first low-side drive unit, and when the second high-side drive unit is enabled, it constitutes a second drive sub-unit with the first low-side drive unit; the first drive sub-unit is a three-phase full-bridge drive circuit composed of six NMOS; the second drive sub-unit is a three-phase full-bridge drive circuit composed of three NMOS and three PMOS.

7. The motor driving chip according to claim 6, characterized in that: The switching unit includes a first switch and a second switch controlled by the first digital signal, the first high-side driving unit includes three first NMOS transistors, the first low-side driving unit includes three second NMOS transistors, and the second high-side driving unit includes three first PMOS transistors; Among them, the three first NMOS tubes are connected to the power supply after passing through the first switch, and the three first NMOS tubes are connected in series with the three second NMOS tubes one by one and then grounded; wherein, the three first PMOS tubes are connected to the power supply after passing through the second switch, and the three first PMOS tubes are connected in series with the three second NMOS tubes one by one and then grounded.

8. The motor driver chip according to any one of claims 1 to 7, characterized in that: Also includes: Parameter detection unit; The parameter detection unit detects the injection molding parameters in real time, and adjusts the resistance value of the first resistor in real time according to the detection result; wherein the injection molding parameters include at least one of the mold cavity volume and the fluidity of the injection molding material.

9. A motor, characterized in that: Including the motor drive chip as described in claim 8.

10. An automobile injection molding device, characterized in that: It comprises a mold, a barrel, a screw, a discharging device, a hydraulic device and the motor described in claim 9.

Images