Motor drive chip, motor and automotive injection molding equipment

Abstract

The present invention relates to the field of integrated circuits, and particularly to a motor drive chip, which includes: a configuration unit for configuring the resistance value of a first resistor according to injection molding parameters; a detection unit for detecting the resistance value of the configured resistor and outputting a first detection signal; an analog-to-digital conversion unit electrically connected to the detection unit for converting the first detection signal into a first digital signal; a drive unit controlled by the first digital signal to operate in a first drive mode or a second drive mode; wherein, the first drive mode refers to a three-phase full-bridge drive circuit composed of six NMOSs for the drive unit; the second drive mode refers to a three-phase full-bridge drive circuit composed of three NMOSs and three PMOSs for the drive unit. The present invention can solve the problem that existing motor drive chips cannot be compatible with multiple working conditions, can be applied to multiple injection molding scenarios, improve stability and reliability, and save costs.

Description

Technical Field

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

[0002] A motor drive chip is a power electronic component composed of metal-oxide-semiconductor field effect transistors. Currently, motor drive chips mainly include a three-phase full-bridge circuit composed of six NMOS transistors (power semiconductor devices, N-type metal-oxide-semiconductors) or a three-phase full-bridge circuit composed of three NMOS transistors and three PMOS (power semiconductor devices, P-type metal-oxide-semiconductors). Among them, the method of using six NMOS transistors to control the motor drive chip is mainly applied to high-current scenarios; while the method of using three NMOS transistors and three PMOS is mainly applied to low-current scenarios. When using a single motor drive chip for control, it is impossible to meet the requirements of different working conditions.

[0003] Molding machines belong to intelligent manufacturing equipment. With the rapid development of new energy vehicles in recent years, considerations for the efficiency, compatibility, cost, etc. of automotive injection molding equipment have been increasing. The drive of injection molding equipment requires a motor drive chip, but due to differences in the size and shape of injection molded parts, the characteristics of injection molding materials, etc., different types of motor drive chips are often required. With the current market's diverse demands for injection molded products and considerations for injection molding costs, there is an urgent need for a general-purpose motor drive chip that can be compatible with different injection molding scenarios, reduce the cost of injection molding equipment, and improve the versatility of molding at the same time.

[0004] In addition, when the existing drive chip fails, there is no backup circuit, and it has to be shut down for processing, so the reliability of the drive circuit is poor, seriously affecting the production efficiency of enterprises. At the same time, for motor drive chips, customers are increasingly inclined to more lightweight and thinner chips, which puts high requirements on the area and volume of the drive chips.

[0005] The above problems have become urgent problems to be solved. Summary of the Invention

[0006] The present invention discloses a motor drive chip, a motor, and an automotive injection molding device. By using a switching unit to select a suitable drive circuit to adapt to the corresponding injection molding scenario, the compatibility of the motor drive chip is improved, and costs are saved; by setting an adjustable first resistor, the change of the injection molding scenario can be monitored automatically in real time, and the drive circuit can be adjusted in real time to enhance the performance of the drive circuit; or the resistance value can be set manually, improving the flexibility and convenience of equipment control.

[0007] The technical solution adopted by the present invention to solve the above technical problems is:

[0008] For the above purposes, the present invention discloses a motor drive chip, a motor, and an automotive injection molding device, including: a configuration unit, a detection unit, an analog-to-digital conversion unit, and a drive unit.

[0009] The configuration unit is used to configure the resistance value of the first resistor according to the injection parameters;

[0010] The detection unit is used to detect the resistance value of the first resistor and output a first detection signal;

[0011] The analog-to-digital conversion unit is electrically connected to the detection unit and is used to convert the first detection signal into a first digital signal;

[0012] The drive unit is controlled by the first digital signal and operates in a first drive mode or a second drive mode;

[0013] Among them, the first drive mode refers to that the drive unit is a three-phase full-bridge drive circuit composed of six NMOSs; the second drive mode refers to that the drive unit is a three-phase full-bridge drive circuit composed of three NMOSs and three PMOSs.

[0014] In some embodiments, the drive unit further includes: a switching unit, a first drive subunit, and a second drive subunit;

[0015] The switching unit is controlled by the first digital signal to enable the first drive subunit or the second drive subunit so that the motor drive chip operates in the first drive mode or the second drive mode;

[0016] Among them, the first drive subunit is a three-phase full-bridge drive circuit composed of six NMOSs; the second drive subunit is a three-phase full-bridge drive circuit composed of three NMOSs and three PMOSs.

[0017] In some embodiments, the switching unit includes a first switch and a second switch, and the first drive subunit and the second drive subunit are respectively connected to the power supply through the first switch and the second switch;

[0018] The first drive subunit includes three parallel first branches, and the second drive subunit 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 connected in series.

[0019] In some embodiments, the motor drive chip further includes that 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 transistor and the third NMOS of the three parallel second branches are respectively connected through a third switch, a fourth switch, and a fifth switch.

[0020] In some embodiments, the motor drive chip further includes a selection unit (100, 200, 300);

[0021] The selection unit is electrically connected to three connection points of the first NMOS and the second NMOS of three parallel first branches and three connection points of the first PMOS and the third NMOS of three parallel second branches, and is configured to select one or more third NMOS as backup MOS when one or more second NMOS are open-circuited, or select one or more first NMOS as backup MOS when one or more third NMOS are open-circuited.

[0022] In some embodiments, the motor drive chip further includes a fault detection circuit;

[0023] 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 or the three third NMOS.

[0024] In some embodiments, the drive unit includes: a switching unit, a first high-side drive unit, a second high-side drive unit, and a first low-side drive unit;

[0025] The switching unit enables the first high-side drive unit or the second high-side drive unit under the control of the first digital signal;

[0026] Wherein, when the first high-side drive unit is enabled, it forms a first drive sub-unit with the first low-side drive unit, and when the second high-side drive unit is enabled, it forms 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.

[0027] In some embodiments, the switching unit includes a first switch and a second switch controlled by the first digital signal, the first high-side drive unit includes three first NMOS transistors, the first low-side drive unit includes three second NMOS transistors, and the second high-side drive unit includes three first PMOS transistors;

[0028] Wherein, the three first NMOS transistors are all connected to the power supply after passing through the first switch, and the three first NMOS transistors are respectively connected in series with the three second NMOS transistors and then grounded; wherein, the three first PMOS transistors are all connected to the power supply after passing through the second switch, and the three first PMOS transistors are respectively connected in series with the three second NMOS transistors and then grounded.

[0029] In some embodiments, the injection molding parameters of the motor drive chip include at least one of the cavity volume and the fluidity of the injection molding material.

[0030] In some embodiments, the motor drive chip further includes a parameter detection unit;

[0031] The parameter detection unit detects the cavity volume and / or the fluidity of the injection molding material in real time, and adjusts the resistance value of the first resistor in real time according to the detection results.

[0032] In a second aspect, the present application provides a motor, including the motor drive chip of the first aspect.

[0033] 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.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] It is possible to switch the appropriate drive circuit in real time according to the changes in the injection molding scenario, that is, the motor drive chip of the present application can adapt to different injection molding scenarios and has high compatibility;

[0036] The drive circuit of the present application can be compatible with different scenarios, which can save the injection molding cost;

[0037] The resistance value of the first resistor can be adjusted according to the injection molding parameters monitored in real time or can be manually configured, ensuring the real-time performance and performance of the injection molding device while taking into account the flexibility of adjustment;

[0038] By multiplexing some MOS transistors, the area of the motor drive chip can be reduced to a certain extent;

[0039] By setting separate lower transistors for the two drive sub-units, the two parts can be used as spares for each other, which can improve the reliability and stability of the drive circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Shows a schematic diagram of the motor drive chip disclosed in an embodiment of the present invention;

[0041] Figure 2 Shows a schematic diagram of the drive unit disclosed in an embodiment of the present invention;

[0042] Figure 3 Shows the circuit of the drive unit disclosed in an embodiment of the present invention Figure 1 ;

[0043] Figure 4 Shows the circuit of the drive unit disclosed in an embodiment of the present invention Figure 2 ;

[0044] Figure 5 Shows the circuit of the drive unit disclosed in an embodiment of the present invention Figure 3 ;

[0045] Figure 6 Shows a schematic diagram of the selection unit disclosed in an embodiment of the present invention;

[0046] Figure 7 Shows the circuit of the driving unit disclosed in an embodiment of the present invention Figure 4 ;

[0047] Figure 8 Shows the circuit of the driving unit disclosed in an embodiment of the present invention Figure 5 .

[0048] In the figure:

[0049] 10 - motor drive chip, 1 - configuration unit, 2 - detection unit, 3 - analog - to - digital conversion unit, 4 - driving unit, 41 - switching unit, 42 - first driving sub - unit, 43 - second driving sub - unit, 20 - selection unit, 100 - first selection unit, 200 - second selection unit, 300 - third selection unit, 421 - first high - side driving unit, 422 - first low - side driving unit, 431 - second high - side driving unit. Detailed implementation manners

[0050] The following further describes the present invention in detail through specific implementation examples in conjunction with the drawings.

[0051] Refer to Figure 1 , an embodiment of the present invention discloses a motor drive chip 10, which includes: a configuration unit 1, a detection unit 2, an analog - to - digital conversion unit 3, and a driving unit 4.

[0052] The configuration unit 1 is used to configure the resistance value of the first resistor R according to the injection molding parameters;

[0053] The detection unit 2 is used to detect the resistance value of the first resistor R and output a first detection signal DET1;

[0054] 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];

[0055] The driving unit 4 is controlled by the first digital signal P[0:1] to operate in a first driving mode or a second driving mode;

[0056] Among them, 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.

[0057] 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 thus a suitable motor drive chip can be selected according to this information. That is to say, in this embodiment, by setting an adjustable first resistor, the change of the injection molding scenario can be monitored in real time, the drive circuit can be adjusted in real time, and the performance of the system can be enhanced; by using the switching unit to select a suitable drive circuit to adapt to the corresponding injection molding scenario, the compatibility of the motor drive chip is improved.

[0058] In some embodiments, the motor drive chip 10 further includes a parameter detection unit;

[0059] The parameter detection unit detects the cavity volume and / or the fluidity of the injection molding material in real time, and adjusts the resistance value of the first resistor in real time according to the detection result.

[0060] In this application, the injection molding parameters are parameters that can affect the selection of the drive circuit, such as at least one of the cavity volume and the fluidity of the injection molding material. For example, when the 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 NMOSs.

[0061] In this application, the resistance value of the first resistor can be adjusted according to the injection molding parameters monitored in real time, or the resistance value of the first resistor can be adjusted manually according to the injection molding parameters. In this case, the priority of the configuration adjustment or the manual adjustment can be set.

[0062] Exemplarily, the priority of the configuration adjustment can be set higher than that of the manual adjustment. In this case, if the adjustment function is enabled, the result of the configuration adjustment shall prevail.

[0063] Exemplarily, the priority of the configuration adjustment can be set lower than that of the manual adjustment. In this case, if the adjustment function is enabled and there is a manual intervention in the adjustment, the result of the manual adjustment shall prevail.

[0064] In this application, the resistance value of the first resistor R is detected by detecting the current or the voltage.

[0065] Exemplarily, the detection unit 2 can 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.

[0066] 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.

[0067] In this 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 facilitate the control drive unit 4 to select to operate in the operating mode corresponding to the current injection molding parameters.

[0068] Refer to Figure 2 , in some embodiments, the drive unit 4 further includes: a switching unit 41, a first drive subunit 42, and a second drive subunit 43;

[0069] The switching unit 41 is controlled by the first digital signal P[0:1] to enable the first drive subunit 42 or the second drive subunit 43, so that the motor drive chip 10 operates in the first drive mode or the second drive mode;

[0070] Among them, the first drive subunit 42 is a three-phase full-bridge drive circuit composed of six NMOSs; the second drive subunit 43 is a three-phase full-bridge drive circuit composed of three NMOSs and three PMOSs.

[0071] In this embodiment, the switching unit 41 is controlled by the first digital signal P[0:1] to output a first enable signal EN1 or a second enable signal EN2, so as to enable the first drive subunit 42 through the first enable signal EN1 or enable the second drive subunit 43 through the second enable signal EN2.

[0072] Refer to Figure 3 , in some embodiments, the switching unit 41 includes a first switch S1 and a second switch S2, and the first drive subunit 42 and the second drive subunit 43 are respectively connected to the power supply VDD through the first switch S1 and the second switch S2;

[0073] The first drive subunit 42 includes three parallel first branches, and the second drive subunit 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 transistor (for example, P1, P2, P3) and a third NMOS transistor (for example, N7, N8, N9) connected in series.

[0074] In this embodiment, the switching unit includes two switches, and these two switches are turned on and off under the control of the first digital signal P[0:1], so as to determine which one of the first drive subunit 42 and the second drive subunit 43 is enabled.

[0075] Exemplarily, when P[0]=1, S1 is closed, the first driving subunit 42 is connected to the power supply VDD, and the first driving subunit 42 is enabled; when P[0]=0, S1 is disconnected, the first driving subunit 42 is disconnected from the power supply VDD, and the first driving subunit 42 is not enabled; when P[1]=1, S2 is closed, the second driving subunit 43 is connected to the power supply VDD, and the second driving subunit 43 is enabled; when P[1]=0, S2 is disconnected, the second driving subunit 43 is disconnected from the power supply VDD, and the second driving subunit 43 is not enabled.

[0076] Referring to Figures 4 - 6 , in some embodiments, the motor drive chip 10 further includes a selection unit 20;

[0077] The selection unit 20 is electrically connected to three connection points (e.g., A1, A2, A3 for connecting to the motor windings respectively) of the first NMOS and the second NMOS in three parallel first branches and three connection points (e.g., B1, B2, B3 for connecting to the motor windings respectively) of the first PMOS transistor and the third NMOS transistor in three parallel second branches, and is configured to select one or more third NMOS transistors as backup MOS transistors when one or more second NMOS transistors are open, or select one or more first NMOS transistors as backup MOS transistors when one or more third NMOS transistors are open.

[0078] Exemplarily, see Figure 5 , when any one of the second NMOS in the first driving subunit 42 fails (assuming that the first driving subunit 42 is enabled at this time), one or more third NMOS in the second driving subunit 43 can be arbitrarily selected as replacements; for example, if N2 fails, one or more of S11, S12, and S13 can be closed.

[0079] Exemplarily, see Figure 5 and Figure 6 , when any one of the third NMOS in the second driving subunit 43 fails (assuming that the second driving subunit 43 is enabled at this time), one or more second NMOS in the first driving subunit 42 can be arbitrarily selected as replacements; for example, if N8 fails, one or more of S12, S22, and S33 can be closed.

[0080] Exemplarily, referring to Figure 4, 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 respectively connected to three connection points (e.g., B1, B2, B3) of the first PMOS transistors (e.g., P1, P2, P3) and the third NMOS transistors (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.

[0081] In this embodiment, the second NMOS transistor in any one of the first branches of the first driving subunit 42 and the third NMOS transistor in one of the second branches of the second driving subunit 43 are backup to each other. For example, when it is determined according to the injection molding parameters that the first driving subunit 42 needs to be started, at this time, S1 is closed and S2 is opened. Suppose that at this time, it is detected by the fault detection circuit that a certain second NMOS transistor has a fault (for example, N2 cannot be closed). At this time, the first driving subunit 42 will not be able to drive the motor to work properly, resulting in the injection molding equipment being unable to complete the injection molding task.

[0082] Exemplarily, since N7 and N2 are backup to 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 transistor N7 is used to replace the second MOS transistor N2 to work. The same is true for the cases where N4, N6, N7, N8, and N9 cannot be used, which will not be elaborated here. It should be noted that in this case, the original PWM signal input to N2 will be input to the control terminal of N7.

[0083] Exemplarily, S3, S4, and S5 can be closed at any time. Different from the previous example, in this example, even if a certain transistor cannot be closed during the operation, the drive circuit can still work properly. For example, if N2 cannot be closed, at this time, N7 can still work properly.

[0084] In some embodiments, the motor drive chip further includes: a fault detection circuit;

[0085] 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.

[0086] Exemplarily, the first digital signal P[0:1] can be used to enable the fault detection circuit to perform fault detection on the first driving subunit 42 or the second driving subunit 43.

[0087] For example, when P[0] = 1, S1 is closed. At this time, the first drive subunit 42 will be enabled, and the drive motor rotates. At this time, the fault detection circuit will be controlled by P[0] = 1 to perform a fault detection on the first drive subunit 42. At the same time, since P[1] = 0, S2 is open, and the fault detection circuit will not perform a fault detection on the second drive subunit 43.

[0088] For another example, when P[0] = 0, S1 is open. At this time, the first drive subunit 42 will be disabled. At this time, P[0] = 0, and no fault detection is performed on the first drive subunit 42. At the same time, since P[1] = 1, S2 is closed, and the fault detection circuit will perform a fault detection on the second drive subunit 43.

[0089] It should be noted that in this application, S1 and S2 will not be closed at the same time. That is, only one of the first drive subunit 42 and the second drive subunit 43 will be enabled to drive the motor. Therefore, the fault detection circuit will only perform a fault detection on one of the first drive subunit 42 and the second drive subunit 43 at the same time.

[0090] In some embodiments, the fault detection circuit determines which drive subunit to perform a fault detection based on the switch states of the first switch and the second switch. Specifically, it can determine whether to perform a fault detection on the first drive subunit 42 or the second drive subunit 43 based on the potential at the connection point between the first drive subunit 42 and the first switch S1 and the potential at the connection point between the second drive subunit 43 and the second switch S2. It should be noted that when the switch is closed, the drain potential of the MOS transistor connected to the switch will become high.

[0091] In some embodiments, referring to Figure 7 , the drive unit 4 includes: a switching unit 41, a first high-side drive unit 421, a second high-side drive unit 431, and a first low-side drive unit 422;

[0092] The switching unit 41 is controlled by the first digital signal P[0:1] to enable the first high-side drive unit 421 or the second high-side drive unit 431;

[0093] Wherein, when the first high-side drive unit 421 is enabled, it forms the first drive subunit 42 with the first low-side drive unit 422, and when the second high-side drive unit 431 is enabled, it forms the second drive subunit 43 with the first low-side drive unit 422; the first drive subunit 42 is a three-phase full-bridge drive circuit composed of six NMOSs; the second drive subunit 43 is a three-phase full-bridge drive circuit composed of three NMOSs and three PMOSs.

[0094] Different from Figures 2 - 6In the driving circuit of this embodiment, the two driving sub-units will share the NMOS transistor on the low side. Although the function of mutual backup is sacrificed and the system reliability is reduced, multiple NMOS transistors are saved, greatly reducing the chip area.

[0095] In this embodiment, the first low-side driving unit 422 can be multiplexed. When a three-phase full-bridge driving circuit composed of six NMOS transistors is required, the first low-side driving unit 422 cooperates with the first high-side driving unit 421 to form the three-phase full-bridge driving circuit. When a three-phase full-bridge driving circuit composed of three NMOS transistors and three PMOS transistors is required, the first low-side driving unit 422 cooperates with the second high-side driving unit 431 to form the three-phase full-bridge driving circuit. That is to say, according to the actual working conditions (such as cavity volume, injection molding material characteristics (fluidity, friction coefficient, etc.)), it is possible to determine which driving circuit is required, and thus determine which high-side driving unit to enable.

[0096] In some embodiments, please refer to Figure 7 , the switching unit 41 includes a first switch S1 and a second switch S2 controlled by the 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;

[0097] Among them, the three first NMOS transistors are all connected to the power supply after passing through the first switch S1, and the three first NMOS transistors are respectively connected in series with the three second NMOS transistors and then grounded; among them, the three first PMOS transistors are all connected to the power supply after passing through the second switch S2, and the three first PMOS transistors are respectively connected in series with the three second NMOS transistors and then grounded.

[0098] In some embodiments, in order to avoid affecting the source potential of another high-side driving unit when a certain driving sub-unit is working, and thus the affected high-side driving unit may not reach the expected state when it may be put into use, switches S3-S5 can be set to disconnect the connections between P1 and N2, P2 and N4, and P3 and N6, as Figure 8 shown. Switches can also be set to disconnect the connections between N1 and N2, N3 and N4, and N5 and N6 (not shown in the figure).

[0099] In a second aspect, the present application provides a motor, including the motor driving chip provided in the first aspect.

[0100] In a third aspect, the present application provides an automotive injection molding device, including a mold, a barrel, a screw, a discharging device, a hydraulic device, and the motor in the second aspect.

[0101] However, it should be understood that the above embodiments of the present invention are only for illustration and explanation, and are not intended to limit the present invention to the scope of the described embodiments. In addition, those skilled in the art can understand 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 protection required by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalent scope.

Claims

1. A motor driver chip, characterized in that: include: A configuration unit, a detection unit, an analog-to-digital conversion unit, a driving unit, and a selection unit; The configuration unit is used to configure the resistance value of the first resistor according to the injection molding parameters; The detection unit is used to detect the resistance value of the first resistor and output a first detection signal; The analog-to-digital conversion unit is electrically connected to the detection unit and is used to convert the first detection signal into a first digital signal; The driving unit comprises: a switching unit, a first driving sub-unit, and a second driving sub-unit; the switching unit is controlled by the first digital signal to enable the first driving sub-unit or the second driving sub-unit; The switching unit includes a first switch and a second switch, and the first driver unit and the second driver unit are connected to the power supply via the first switch and the second switch respectively; the first driver unit includes three first branches connected in parallel, and the second driver unit includes three second branches connected in parallel; 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; The selection unit is electrically connected to a connection point between the first NMOS and the second NMOS in each first branch and a connection point between the first PMOS tube and the third NMOS tube in each second branch, 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 second NMOS tubes as backup MOS tubes when one or more of the third NMOS tubes are open.

2. The motor driver chip according to claim 1, 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.

3. 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; The driving unit comprises: a switching unit, a first high-side driving unit, a second high-side driving unit, and a first low-side driving unit; Wherein, the switching unit comprises a first switch and a second switch, and 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; when the first high-side driving unit is enabled, it constitutes a first driving sub-unit with the first low-side driving unit, and when the second high-side driving unit is enabled, it constitutes a second driving sub-unit with the first low-side driving unit; the first driving sub-unit is a three-phase full-bridge driving circuit composed of six NMOS; the second driving sub-unit is a three-phase full-bridge driving circuit composed of three NMOS and three PMOS; The first high-side driving unit includes three first NMOS tubes, the first low-side driving unit includes three second NMOS tubes, and the second high-side driving unit includes three first PMOS tubes; the three first NMOS tubes are connected to a power supply via 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; the three first PMOS tubes are connected to a power supply via 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.

4. The motor driver chip according to any one of claims 1 to 3, 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; The injection molding parameters include at least one of the mold cavity volume and the fluidity of the injection molding material.

5. A motor, characterized in that: Including the motor drive chip as described in claim 4.

6. An automobile injection molding equipment, characterized in that: It comprises a mold, a barrel, a screw, a discharging device, a hydraulic device and the motor described in claim 5.

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