Driving circuit, motor control circuit and vehicle

Abstract

The utility model provides a driving circuit, a motor control circuit and a vehicle, and relates to the technical field of motor control. The driving circuit comprises a driving power supply, an upper bridge arm driving unit, a pre-charging capacitor and a lower bridge arm driving unit. According to the technical scheme provided by the utility model, the upper bridge arm driving unit, the pre-charging capacitor and the lower bridge arm driving unit are electrically connected with the positive electrode and the negative electrode of the same driving power supply, so that the purpose of supplying power to the whole driving circuit through the same driving power supply is achieved, a connecting assembly of the driving circuit is simplified, and the occupied volume of the driving circuit is reduced; finally, the purposes of miniaturization and low cost of the motor control circuit are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor control, and more specifically, to a drive circuit, a motor control circuit and a vehicle. Background Art

[0002] With energy and environmental issues becoming increasingly prominent in recent years, fuel-powered vehicles have been subject to certain restrictions and impacts. Electric vehicles, powered by batteries, offer numerous advantages over traditional fuel-powered vehicles, including energy savings, low pollution, and high efficiency. Consequently, they have experienced rapid growth in recent years. As key components of electric vehicles, motors, drives, and motor controllers play a crucial role in the overall vehicle system. Research in these areas is of great theoretical and practical significance. Utility Model Content

[0003] In view of this, the present invention provides a drive circuit, a motor control circuit and a vehicle, which effectively solve the technical problems existing in the prior art, reduce the occupied volume of the drive circuit, and achieve the purpose of miniaturization and low cost of the motor control circuit.

[0004] To achieve the above purpose, the technical solutions provided by the present invention are as follows:

[0005] A driving circuit comprising: a driving power supply, an upper bridge arm driving unit (110), a pre-charge capacitor (C1) and a lower bridge arm driving unit (120);

[0006] The power input end of the upper bridge arm drive unit (110) is electrically connected to the positive electrode (U+) of the drive power supply, the power output end of the upper bridge arm drive unit (110) is electrically connected to the midpoint of the bridge arm, and the control output end of the upper bridge arm drive unit (110) is electrically connected to the control end of the upper bridge arm switch (M1); wherein the bridge arm comprises the upper bridge arm switch (M1) and the lower bridge arm switch (M2) connected in series, and the connection point between the upper bridge arm switch (M1) and the lower bridge arm switch (M2) is the midpoint of the bridge arm;

[0007] The power input end of the lower bridge arm drive unit (120) is electrically connected to the positive electrode (U+) of the drive power supply, the power output end of the lower bridge arm drive unit (120) is electrically connected to the negative electrode (U-) of the drive power supply, and the control output end of the lower bridge arm drive unit (120) is electrically connected to the control end of the lower bridge arm switch (M2);

[0008] The first end of the pre-charge capacitor (C1) is electrically connected to the positive electrode (U+) of the driving power supply, and the second end of the pre-charge capacitor (C1) is electrically connected to the midpoint of the bridge arm.

[0009] Optionally, the driving circuit further includes: a current limiting device, wherein a first end of the current limiting device is electrically connected to the positive electrode of the driving power supply, and a second end of the current limiting device is electrically connected to the power input end of the upper bridge arm driving unit and / or the first end of the pre-charge capacitor;

[0010] Alternatively, the driving circuit further comprises: an anti-reverse device, wherein the input end of the anti-reverse device is electrically connected to the positive electrode of the driving power supply, and the output end of the anti-reverse device is electrically connected to the first end of the pre-charge capacitor;

[0011] Alternatively, the driving circuit further includes: an anti-reverse device, the input end of the anti-reverse device is electrically connected to the positive pole of the driving power supply, and the output end of the anti-reverse device is electrically connected to the power input end of the upper bridge arm driving unit and the first end of the pre-charge capacitor.

[0012] Optionally, the driving circuit further includes: a current limiting device and an anti-reverse device connected in series, wherein:

[0013] The current limiting device is connected in series between the positive electrode of the driving power supply and the input end of the anti-reverse device, and the output end of the anti-reverse device is electrically connected to the power input end of the upper bridge arm driving unit and / or the first end of the pre-charge capacitor;

[0014] Alternatively, the current limiting device is connected in series between the positive electrode of the driving power supply and the input end of the anti-reverse device, the input end of the anti-reverse device is electrically connected to the power input end of the upper bridge arm driving unit, and the output end of the anti-reverse device is electrically connected to the first end of the pre-charge capacitor;

[0015] Alternatively, the anti-reverse device is connected in series between the positive electrode of the driving power supply and the first end of the current limiting device, and the second end of the current limiting device is electrically connected to the power input end of the upper bridge arm driving unit and the first end of the pre-charge capacitor;

[0016] Alternatively, the anti-reverse device is connected in series between the positive electrode of the driving power supply and the first end of the current limiting device, and the second end of the current limiting device is electrically connected to the first end of the pre-charge capacitor;

[0017] Alternatively, the anti-reverse device is connected in series between the positive electrode of the driving power supply and the first end of the current limiting device, the first end of the current limiting device is electrically connected to the power input end of the upper bridge arm driving unit, and the second end of the current limiting device is electrically connected to the first end of the pre-charge capacitor.

[0018] Optionally, the driving circuit further includes: a voltage-stabilizing capacitor, a first end of the voltage-stabilizing capacitor electrically connected to the power output end of the lower bridge arm driving unit, and a second end of the voltage-stabilizing capacitor electrically connected to the power output end of the lower bridge arm driving unit.

[0019] Optionally, at least one of the upper bridge arm driving unit and the lower bridge arm driving unit includes a push-pull circuit.

[0020] Optionally, the push-pull circuit includes a first switch (K1) and a second switch (K2), and the conduction types of the first switch (K1) and the second switch (K2) are opposite; the first end of the first switch (K1) is the power input end of the bridge arm drive unit and is electrically connected to the positive pole (U+) of the drive power supply, the second end of the first switch (K1) is electrically connected to the first end of the second switch (K2) as the control output end of the bridge arm drive unit, and the second end of the second switch (K2) is the power output end of the bridge arm drive unit.

[0021] Optionally, the driving power supply includes a transformer.

[0022] Based on the same inventive concept, the present invention further provides a motor control circuit, which includes:

[0023] A power topology circuit, the power topology circuit comprising at least one phase bridge arm, the bridge arm comprising an upper bridge arm switch and a lower bridge arm switch connected in series, and the connection point between the upper bridge arm switch and the lower bridge arm switch is the midpoint of the bridge arm;

[0024] At least one driving circuit, one driving circuit is electrically connected to one phase of the bridge arm, wherein the driving circuit is the above-mentioned driving circuit.

[0025] Optionally, the driving power supplies of all the driving circuits are the same power supply.

[0026] Optionally, at least one of the upper arm switch and the lower arm switch is an IGBT or a MOS.

[0027] Based on the same inventive concept, the present invention also provides a vehicle, which includes the above-mentioned motor control circuit.

[0028] Compared with the existing technology, the technical solution provided by the utility model has at least the following advantages:

[0029] The utility model provides a drive circuit, a motor control circuit and a vehicle, wherein the drive circuit comprises: a drive power supply, an upper bridge arm drive unit, a pre-charge capacitor and a lower bridge arm drive unit; the power input end of the upper bridge arm drive unit is electrically connected to the positive pole of the drive power supply, the power output end of the upper bridge arm drive unit is electrically connected to the midpoint of the bridge arm, and the control output end of the upper bridge arm drive unit is electrically connected to the control end of the upper bridge arm switch; the power input end of the lower bridge arm drive unit is electrically connected to the positive pole of the drive power supply, the power output end of the lower bridge arm drive unit is electrically connected to the negative pole of the drive power supply, and the control output end of the lower bridge arm drive unit is electrically connected to the control end of the lower bridge arm switch; the first end of the pre-charge capacitor is electrically connected to the positive pole of the drive power supply, and the second end of the pre-charge capacitor is electrically connected to the midpoint of the bridge arm.

[0030] From the above content, it can be seen that the technical solution provided by the utility model is that the upper bridge arm drive unit, the pre-charge capacitor and the lower bridge arm drive unit are all electrically connected to the positive and negative poles of the same drive power supply, thereby achieving the purpose of powering the entire drive circuit through the same drive power supply, simplifying the connection components of the drive circuit, reducing the occupied volume of the drive circuit, and ultimately achieving the purpose of miniaturization and low cost of the motor control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0032] Figure 1 A circuit diagram of a driving circuit provided in an embodiment of the present utility model;

[0033] Figure 2 A circuit diagram of another driving circuit provided in an embodiment of the present utility model;

[0034] Figure 3 A circuit diagram of another driving circuit provided in an embodiment of the present utility model;

[0035] Figure 4 A circuit diagram of another driving circuit provided in an embodiment of the present utility model;

[0036] Figure 5 A circuit diagram of another driving circuit provided in an embodiment of the present utility model;

[0037] Figure 6 A circuit diagram of another driving circuit provided in an embodiment of the present utility model;

[0038] Figure 7 A circuit diagram of another driving circuit provided in an embodiment of the present utility model;

[0039] Figure 8 A circuit diagram of another driving circuit provided in an embodiment of the present utility model;

[0040] Figure 9 A circuit diagram of another driving circuit provided in an embodiment of the present utility model;

[0041] Figure 10 A circuit diagram of another driving circuit provided in an embodiment of the present utility model;

[0042] Figure 11 A circuit diagram of another driving circuit provided in an embodiment of the present utility model;

[0043] Figure 12 A circuit diagram of another driving circuit provided in an embodiment of the present utility model;

[0044] Figure 13 A circuit diagram of another driving circuit provided in an embodiment of the present utility model;

[0045] Figure 14 A circuit diagram of a motor control circuit provided in an embodiment of the present utility model. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] As described in the background technology, motors, drivers, and motor controllers, as the main components of electric vehicles, play a very important role in the overall system of electric vehicles. Research in related fields has important theoretical and practical significance. The motor controller includes a multi-phase bridge arm, and each phase bridge arm is controlled on and off by a driver chip connected to it. The existing driver chip includes a circuit for driving the upper bridge arm and a circuit for driving the lower bridge arm, and the two circuits are powered by their respective corresponding drive power supplies. As a result, the number of drive power supplies in the existing motor controller is relatively large, resulting in a high volume and cost of the motor controller.

[0048] Based on this, the embodiments of the present invention provide a drive circuit, a motor control circuit and a vehicle, which effectively solve the technical problems existing in the prior art, reduce the occupied volume of the drive circuit, and achieve the purpose of miniaturization and low cost of the motor control circuit.

[0049] To achieve the above purpose, the technical solution provided by the embodiment of the present invention is as follows, specifically combined with Figures 1 to 14 The technical solutions provided by the embodiments of the present utility model are described in detail.

[0050] refer to Figure 1 As shown, it is a circuit diagram of a driving circuit provided by an embodiment of the present invention, wherein the driving circuit is used to drive a single-phase bridge arm of a power topology circuit, wherein the bridge arm includes an upper bridge arm switch M1 and a lower bridge arm switch M2 connected in series, and the connection point between the upper bridge arm switch M1 and the lower bridge arm switch M2 is the midpoint of the bridge arm, that is, the first end of the upper bridge arm switch M1 is electrically connected to the positive pole DC+ of the DC power supply, the connection point where the second end of the upper bridge arm switch M1 is electrically connected to the first end of the lower bridge arm switch M2 is the midpoint of the bridge arm, and the second end of the lower bridge arm switch M2 is electrically connected to the negative pole DC- of the DC power supply.

[0051] Continue to refer Figure 1 As shown, the driving circuit provided by the embodiment of the present invention includes: a driving power supply, an upper bridge arm driving unit 110, a pre-charge capacitor C1, and a lower bridge arm driving unit 120. The power input terminal of the upper bridge arm driving unit 110 is electrically connected to the positive electrode U+ of the driving power supply, the power output terminal of the upper bridge arm driving unit 110 is electrically connected to the midpoint of the bridge arm, and the control output terminal of the upper bridge arm driving unit 110 is electrically connected to the control terminal of the upper bridge arm switch M1.

[0052] The power input terminal of the lower bridge arm driving unit 120 is electrically connected to the positive pole U+ of the driving power supply, the power output terminal of the lower bridge arm driving unit 120 is electrically connected to the negative pole U- of the driving power supply, and the control output terminal of the lower bridge arm driving unit 120 is electrically connected to the control terminal of the lower bridge arm switch M2. In addition, the first end of the pre-charge capacitor C1 is electrically connected to the positive pole U+ of the driving power supply, and the second end of the pre-charge capacitor C1 is electrically connected to the midpoint of the bridge arm. The negative pole U- of the driving power supply and the negative pole DC- of the DC power supply can be the same port, and this is not specifically limited in the present invention.

[0053] It is understood that the control output terminal of the upper bridge arm drive unit provided in the embodiment of the present invention is used to output the upper bridge control signal, while the control output terminal of the lower bridge arm drive unit is used to output the lower bridge arm control signal. The lower bridge arm control signal is a signal that controls the lower bridge arm switch to be turned on and then turned off after a set period of time has elapsed to allow the pre-charge capacitor to be fully charged. The upper bridge arm control signal is a signal that controls the upper bridge arm switch to be driven on or off according to a set timing after the pre-charge capacitor is fully charged.

[0054] It can be seen from the above content that the technical solution provided by the embodiment of the present invention is that after the system is powered on, the upper arm switch is controlled to be turned off by the upper arm control signal, and the lower arm control signal controls the lower arm switch to be turned on, thereby realizing a current loop of the positive pole of the driving power supply, the pre-charge capacitor, the lower arm switch, and the negative pole of the driving power supply, thereby charging the pre-charge capacitor; after the pre-charge capacitor is charged for a set period of time (the set period is determined with reference to the capacitance of the pre-charge capacitor, and the present invention does not impose specific restrictions), the pre-charge capacitor is fully charged, the lower arm control signal controls the lower arm switch to be turned off, and the upper arm control signal drives the upper arm switch to be turned on and off according to the setting. At this time, the upper arm switch provides charge through the pre-charge capacitor, thereby achieving the driving purpose. Therefore, on the basis of realizing the control of the bridge arm by the driving circuit, the upper bridge arm driving unit, pre-charge capacitor and lower bridge arm driving unit provided in the embodiment of the utility model are all electrically connected to the positive and negative poles of the same driving power supply, thereby achieving the purpose of powering the entire driving circuit through the same driving power supply, simplifying the connection components of the driving circuit, reducing the occupied volume of the driving circuit, and ultimately achieving the purpose of miniaturization and low cost of the motor control circuit.

[0055] In order to optimize the driving circuit provided by the embodiment of the present invention, the driving circuit may further include at least one of a current limiting device and an anti-reverse device; that is, the driving circuit provided by the embodiment of the present invention may include a current limiting device; or the driving circuit may include an anti-reverse device; or the driving circuit may include both a current limiting device and an anti-reverse device. Figure 2 As shown, it is a circuit diagram of another driving circuit provided by an embodiment of the present invention, wherein the driving circuit provided by the embodiment of the present invention further includes: a current limiting device 200, a first end of the current limiting device 200 is electrically connected to the positive electrode U+ of the driving power supply, and a second end of the current limiting device 200 is electrically connected to the power input end of the upper bridge arm driving unit 110 and the first end of the pre-charge capacitor C1, so as to avoid damage to the upper bridge arm driving unit 110 and the pre-charge capacitor C1 by the impact current, thereby improving the reliability of the driving circuit.

[0056] refer to Figure 3As shown in FIG, a circuit diagram of another driving circuit provided by an embodiment of the present invention, wherein the second end of the current limiting device 200 provided by the present invention can also be electrically connected only to the power input end of the upper bridge arm driving unit 110, while the first end of the pre-charge capacitor C1 is electrically connected to the positive electrode U+ of the driving power supply, thereby avoiding damage to the upper bridge arm driving unit 110 caused by the impact current and improving the reliability of the driving circuit. Or refer to Figure 4 As shown, a circuit diagram of another drive circuit provided by an embodiment of the present invention, the second end of the current limiting device 200 provided by the present invention can also be electrically connected only to the first end of the pre-charge capacitor C1, and the power input terminal of the upper bridge arm drive unit 110 is electrically connected to the positive pole U+ of the drive power supply, so as to avoid the impact current from damaging the pre-charge capacitor C1 and improve the reliability of the drive circuit. The present invention does not make specific restrictions on the connection mode of this current limiting device 200 with the upper bridge arm drive unit 110 and the pre-charge capacitor C1, and it is necessary to make specific selections based on actual applications. Thus, by arranging the current limiting device between the positive pole of the drive power supply and the power input terminal of the upper bridge arm drive unit and / or the first end of the pre-charge capacitor, the reliability of the drive circuit is improved. Optionally, the current limiting device provided by the embodiment of the present invention can be a current limiting resistor, to which the present invention does not make specific restrictions.

[0057] refer to Figure 5 As shown, it is a circuit diagram of another driving circuit provided by an embodiment of the present invention, wherein the driving circuit provided by the embodiment of the present invention further includes: an anti-reverse device 300, the input end of the anti-reverse device 300 is electrically connected to the positive electrode U+ of the driving power supply, the output end of the anti-reverse device 300 is electrically connected to the first end of the pre-charge capacitor C1, and the power input end of the upper bridge arm driving unit 110 is electrically connected to the positive electrode U+ of the driving power supply. The anti-reverse device 300 can prevent the current of the pre-charge capacitor C1 from flowing back to the driving power supply during the operation of the driving circuit, thereby further improving the reliability of the driving circuit. Or refer to Figure 6 As shown, it is a circuit diagram of another driving circuit provided by an embodiment of the present invention. The driving circuit provided by the embodiment of the present invention also includes: an anti-reverse device 300, the input end of the anti-reverse device 300 is electrically connected to the positive pole U+ of the driving power supply, and the output end of the anti-reverse device 300 is electrically connected to the power input end of the upper bridge arm driving unit 110 and the first end of the pre-charge capacitor C1. The anti-reverse device 300 can prevent the current of the pre-charge capacitor C1 from flowing back to the driving power supply during the operation of the driving circuit, and can also prevent the current of the upper bridge arm driving unit 110 from flowing back to the driving power supply, thereby further improving the reliability of the driving circuit. Optionally, the anti-reverse device provided by the embodiment of the present invention can be an anti-reverse diode, and the present invention does not make specific restrictions on this. Among them, the anode of the anti-reverse diode is the input end of the anti-reverse device, and the cathode of the anti-reverse diode is the output end of the anti-reverse device.

[0058] The utility model provides Figures 2 to 4 This is an embodiment in which the driving circuit only includes the current limiting device 200, and Figure 5 and Figure 6 This is an embodiment in which the driving circuit only includes the anti-reverse device 300. In one embodiment of the present utility model, the driving circuit may also include a current limiting device and an anti-reverse device at the same time. Figure 7 As shown, a circuit diagram of another drive circuit provided by an embodiment of the present invention, wherein the drive circuit provided by an embodiment of the present invention may include a current limiting device 200 and an anti-reverse device 300 connected in series, wherein the current limiting device 200 is connected in series between the positive pole U+ of the drive power supply and the input end of the anti-reverse device 300, the first end of the current limiting device 200 is electrically connected to the positive pole U+ of the drive power supply, the second end of the current limiting device 200 is electrically connected to the input end of the anti-reverse device 300, and the output end of the anti-reverse device 300 is electrically connected to the power input end of the upper bridge arm drive unit 110 and the first end of the pre-charge capacitor C1. Thus, the current limiting device 200 can avoid the impact current from damaging the upper bridge arm drive unit 110 and the pre-charge capacitor C1, and the anti-reverse device 300 can prevent the current of the pre-charge capacitor C1 from flowing back to the drive power supply during the operation of the drive circuit, thereby improving the reliability of the drive circuit. Among them, the current limiting device 200 can be a current limiting resistor, and the anti-reverse device 300 can be an anti-reverse diode.

[0059] Or refer to Figure 8 As shown, it is a circuit diagram of another driving circuit provided by an embodiment of the present invention. When the current limiting device 200 provided by the embodiment of the present invention is connected in series between the positive electrode U+ of the driving power supply and the input end of the anti-reverse device 300, the first end of the current limiting device 200 is electrically connected to the positive electrode U+ of the driving power supply, the second end of the current limiting device 200 is electrically connected to the input end of the anti-reverse device 300, the input end of the anti-reverse device 300 is electrically connected to the power input end of the upper bridge arm driving unit 110, and the output end of the anti-reverse device 300 can be electrically connected to the first end of the pre-charge capacitor C1. As a result, the current limiting device 200 can avoid the impact current from damaging the upper bridge arm driving unit 110 and the pre-charge capacitor C1, and the anti-reverse device 300 can prevent the current of the pre-charge capacitor C1 from flowing back to the driving power supply during the operation of the driving circuit, thereby improving the reliability of the driving circuit.

[0060] Or refer to Figure 9As shown, it is a circuit diagram of another driving circuit provided by an embodiment of the present invention. When the driving circuit provided by the embodiment of the present invention includes a current limiting device 200 and an anti-reverse device 300 connected in series, the anti-reverse device 300 can also be connected in series between the positive electrode U+ of the driving power supply and the first end of the current limiting device 200, the input end of the anti-reverse device 300 is electrically connected to the positive electrode U+ of the driving power supply, the output end of the anti-reverse device 300 is electrically connected to the first end of the current limiting device 200, and the second end of the current limiting device 200 can be electrically connected to the power input end of the upper bridge arm driving unit 110 and the first end of the pre-charge capacitor C1. As a result, the current limiting device 200 can avoid the impact current from damaging the upper bridge arm driving unit 110 and the pre-charge capacitor C1, and the anti-reverse device 300 can prevent the current of the pre-charge capacitor C1 from flowing back to the driving power supply during the operation of the driving circuit, thereby improving the reliability of the driving circuit.

[0061] Or refer to Figure 10 As shown, it is a circuit diagram of another driving circuit provided by an embodiment of the present invention. When the driving circuit provided by the embodiment of the present invention includes a current limiting device 200 and an anti-reverse device 300 connected in series, the anti-reverse device 300 can also be connected in series between the positive electrode U+ of the driving power supply and the first end of the current limiting device 200, the input end of the anti-reverse device 300 is electrically connected to the positive electrode U+ of the driving power supply, the output end of the anti-reverse device 300 is electrically connected to the first end of the current limiting device 200, and the second end of the current limiting device 200 can be electrically connected to the first end of the pre-charge capacitor C1, and the power input end of the upper bridge arm driving unit 110 is electrically connected to the positive electrode U+ of the driving power supply. As a result, the current limiting device 200 can avoid the impact current from damaging the pre-charge capacitor C1, and the anti-reverse device 300 can prevent the current of the pre-charge capacitor C1 from flowing back to the driving power supply during the operation of the driving circuit, thereby improving the reliability of the driving circuit.

[0062] Or refer to Figure 11 As shown, it is a circuit diagram of another driving circuit provided by an embodiment of the present invention. When the driving circuit provided by the embodiment of the present invention includes a current limiting device 200 and an anti-reverse device 300 connected in series, the anti-reverse device 300 can also be connected in series between the positive electrode U+ of the driving power supply and the first end of the current limiting device 200, the input end of the anti-reverse device 300 is electrically connected to the positive electrode U+ of the driving power supply, the output end of the anti-reverse device 300 is electrically connected to the first end of the current limiting device 200, the first end of the current limiting device 200 is also electrically connected to the power input end of the upper bridge arm driving unit 110, and the second end of the current limiting device 200 is electrically connected to the first end of the pre-charge capacitor C1. As a result, the current limiting device 200 can avoid the impact current from damaging the pre-charge capacitor C1, and the anti-reverse device 300 can prevent the current of the pre-charge capacitor C1 from flowing back to the driving power supply during the operation of the driving circuit, thereby improving the reliability of the driving circuit.

[0063] refer to Figure 12 As shown, it is a circuit diagram of another driving circuit provided by an embodiment of the present invention, wherein the driving circuit provided by the embodiment of the present invention also includes: a voltage-stabilizing capacitor C2, a first end of the voltage-stabilizing capacitor C2 is electrically connected to the power output end of the lower bridge arm driving unit 120, and a second end of the voltage-stabilizing capacitor C2 is electrically connected to the power output end of the lower bridge arm driving unit 120. The voltage at the lower bridge arm unit 120 is stabilized by the voltage-stabilizing capacitor C2, thereby further improving the reliability of the driving circuit.

[0064] refer to Figure 13 As shown, it is a circuit diagram of another driving circuit provided by an embodiment of the present invention, wherein at least one of the upper bridge arm driving unit 110 and the lower bridge arm driving unit 120 provided by the embodiment of the present invention includes a push-pull circuit. The push-pull circuit includes a first switch K1 and a second switch K2, and the conduction types of the first switch K1 and the second switch K2 are opposite. The first end of the first switch K1 serves as the power input end of the bridge arm driving unit and is electrically connected to the positive electrode U+ of the driving power supply. The second end of the first switch K1 is electrically connected to the first end of the second switch K2 and serves as the control output end of the bridge arm driving unit, and the second end of the second switch K2 serves as the power output end of the bridge arm driving unit. It should be noted that the embodiment of the present invention does not impose specific restrictions on the switch tube types of the first switch and the second switch, and specific design is required according to actual application.

[0065] In any of the above embodiments of the present invention, the driving power supply provided in the embodiment of the present invention includes a transformer, wherein the positive pole of the driving power supply is the positive pole of the secondary side of the transformer, and the negative pole of the driving power supply is the negative pole of the primary side of the transformer, thereby providing the required power supply voltage to the driving circuit through the transformer. The embodiment of the present invention does not impose any specific restrictions on the type of this driving power supply.

[0066] Based on the same inventive concept, the present utility model embodiment also provides a motor control circuit. Figure 14 FIG. 1 is a circuit diagram of a motor control circuit provided by an embodiment of the present invention. It should be noted that the following description uses a power topology circuit including a three-phase bridge arm as an example (in other embodiments of the present invention, the power topology circuit may also include a single-phase or multi-phase bridge arm, which is not specifically limited by the present invention). The motor control circuit provided by the embodiment of the present invention includes:

[0067] A power topology circuit includes at least one phase bridge arm (such as bridge arm 201, bridge arm 202 and bridge arm 203), and the composition and connection structure of all bridge arms are the same, wherein the bridge arm of any phase includes an upper bridge arm switch M1 and a lower bridge arm switch M2 connected in series, and the connection point between the upper bridge arm switch M1 and the lower bridge arm switch M2 is the midpoint of the bridge arm; at least one drive circuit (such as drive circuit 101, drive circuit 102 and drive circuit 103), one of the drive circuits is electrically connected to the bridge arm of one phase, drive circuit 101 is electrically connected to bridge arm 201, drive circuit 102 is electrically connected to bridge arm 202, and drive circuit 103 is electrically connected to bridge arm 203.

[0068] The driving circuit provided in the embodiment of the present invention is the driving circuit provided in any of the above embodiments. That is, any driving circuit provided in the embodiment of the present invention includes: a driving power supply, an upper bridge arm driving unit 110, a pre-charge capacitor C1 and a lower bridge arm driving unit 120. The power input end of the upper bridge arm driving unit 110 is electrically connected to the positive pole U+ of the driving power supply, the power output end of the upper bridge arm driving unit 110 is electrically connected to the midpoint of the bridge arm, and the control output end of the upper bridge arm driving unit 110 is electrically connected to the control end of the upper bridge arm switch M1. The power input end of the lower bridge arm driving unit 120 is electrically connected to the positive pole U+ of the driving power supply, the power output end of the lower bridge arm driving unit 120 is electrically connected to the negative pole U- of the driving power supply, and the control output end of the lower bridge arm driving unit 120 is electrically connected to the control end of the lower bridge arm switch M2. Furthermore, a first end of the pre-charge capacitor C1 is electrically connected to the positive electrode U+ of the driving power supply, and a second end of the pre-charge capacitor C1 is electrically connected to the midpoint of the bridge arm. Furthermore, the driving circuit also includes a current limiting device 200, an anti-reverse device 300, and a voltage-stabilizing capacitor C2. The technical content of this is the same as that of the driving circuit provided in the above embodiment, so this utility model will not be redundantly described.

[0069] Continue to refer Figure 14 As shown, the driving power supplies for all the driving circuits provided by the embodiment of the present invention are the same power supply. That is, the positive poles U+ of the driving power supplies of all the driving circuits are the same port, and the negative poles U- of the driving power supplies are the same port. As a result, all the driving circuits can be powered by the same driving power supply, further reducing the occupied volume and cost of the motor control circuit.

[0070] It can be understood that when the motor drive circuit provided by the embodiment of the present invention is working, after the motor drive circuit is powered on, the upper bridge arm switches of all bridge arms are controlled to be turned off by their respective corresponding upper bridge arm control signals, while the corresponding lower bridge arm control signals of the remaining drive circuits control the lower bridge arm switches to be turned on, wherein the lower bridge arm switches of all bridge arms can be controlled to be turned on at the same time, and can also be controlled to be turned on in a sequential manner (such as when the power topology circuit includes a three-phase bridge arm, after controlling one lower bridge arm switch to be turned on, the next lower bridge arm switch is controlled to be turned on after an interval set time, and then the last lower bridge arm switch is controlled to be turned on after an interval set time, thereby avoiding the problem of large current fluctuations when turned on at the same time). The present invention does not impose specific restrictions on this. In this way, a current loop path is realized between the positive electrode of the driving power supply in each driving circuit and the corresponding bridge arm, the pre-charge capacitor, the lower bridge arm switch, and the negative electrode of the driving power supply, thereby charging the pre-charge capacitor; after the set time period (the set time period is determined with reference to the capacitance of the pre-charge capacitor, and the present invention does not impose specific restrictions), the pre-charge capacitor is charged, and the lower bridge arm control signal output by each lower bridge arm driving unit controls the corresponding lower bridge arm switch to be turned off, and the upper bridge arm control signal output by each upper bridge arm driving unit drives the corresponding upper bridge arm switch to be turned on and off according to the setting. At this time, the upper bridge arm switch provides charge through the pre-charge capacitor, thereby achieving the driving purpose.

[0071] Based on the above working principle, on the basis of realizing the control of the bridge arm by the driving circuit, the upper bridge arm driving unit, pre-charge capacitor and lower bridge arm driving unit of all driving circuits provided in the embodiment of the utility model are electrically connected to the positive and negative poles of the same driving power supply, thereby achieving the purpose of powering all driving circuits through the same driving power supply, further reducing the volume and cost of the motor control circuit.

[0072] In any of the above embodiments of the present invention, at least one of the upper-arm switch and the lower-arm switch provided in the embodiment of the present invention is an IGBT (Insulated Gate Bipolar Transistor) or a MOS (MOSFET, Metal-Oxide-Semiconductor Field-Effect Transistor). Furthermore, the power topology circuit provided in the embodiment of the present invention may be an inverter circuit.

[0073] Based on the same inventive concept, embodiments of the present invention further provide a vehicle, comprising a motor control circuit according to any of the above embodiments, and a power topology circuit of the motor control circuit electrically connected to a motor. A DC power supply can provide the DC voltage required for the motor to operate. The vehicle provided by embodiments of the present invention may include an electric vehicle, etc., and the present invention does not impose any specific limitations on this.

[0074] An embodiment of the present utility model provides a drive circuit, a motor control circuit and a vehicle, wherein the drive circuit includes: a drive power supply, an upper bridge arm drive unit, a pre-charge capacitor and a lower bridge arm drive unit; the power input end of the upper bridge arm drive unit is electrically connected to the positive pole of the drive power supply, the power output end of the upper bridge arm drive unit is electrically connected to the midpoint of the bridge arm, and the control output end of the upper bridge arm drive unit is electrically connected to the control end of the upper bridge arm switch; the power input end of the lower bridge arm drive unit is electrically connected to the positive pole of the drive power supply, the power output end of the lower bridge arm drive unit is electrically connected to the negative pole of the drive power supply, and the control output end of the lower bridge arm drive unit is electrically connected to the control end of the lower bridge arm switch; the first end of the pre-charge capacitor is electrically connected to the positive pole of the drive power supply, and the second end of the pre-charge capacitor is electrically connected to the midpoint of the bridge arm.

[0075] From the above content, it can be seen that the technical solution provided by the embodiment of the utility model is that the upper bridge arm drive unit, the pre-charge capacitor and the lower bridge arm drive unit are all electrically connected to the positive and negative poles of the same drive power supply, thereby achieving the purpose of powering the entire drive circuit through the same drive power supply, simplifying the connection components of the drive circuit, reducing the occupied volume of the drive circuit, and ultimately achieving the purpose of miniaturization and low cost of the motor control circuit.

[0076] In the description of this utility model, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0077] In this utility model, unless otherwise specified or limited, terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0078] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0079] In this utility model, if the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0080] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A driving circuit, characterized in that: The driving circuit comprises: a driving power supply, an upper bridge arm driving unit (110), a pre-charge capacitor (C1) and a lower bridge arm driving unit (120); The power input end of the upper bridge arm drive unit (110) is electrically connected to the positive electrode (U+) of the drive power supply, the power output end of the upper bridge arm drive unit (110) is electrically connected to the midpoint of the bridge arm, and the control output end of the upper bridge arm drive unit (110) is electrically connected to the control end of the upper bridge arm switch (M1); wherein the bridge arm comprises the upper bridge arm switch (M1) and the lower bridge arm switch (M2) connected in series, and the connection point between the upper bridge arm switch (M1) and the lower bridge arm switch (M2) is the midpoint of the bridge arm; The power input end of the lower bridge arm drive unit (120) is electrically connected to the positive electrode (U+) of the drive power supply, the power output end of the lower bridge arm drive unit (120) is electrically connected to the negative electrode (U-) of the drive power supply, and the control output end of the lower bridge arm drive unit (120) is electrically connected to the control end of the lower bridge arm switch (M2); The first end of the pre-charge capacitor (C1) is electrically connected to the positive electrode (U+) of the driving power supply, and the second end of the pre-charge capacitor (C1) is electrically connected to the midpoint of the bridge arm.

2. The driving circuit according to claim 1, wherein: The driving circuit further comprises: a current limiting device (200), a first end of the current limiting device (200) being electrically connected to the positive electrode (U+) of the driving power supply, and a second end of the current limiting device (200) being electrically connected to the power input end of the upper bridge arm driving unit (110) and / or the first end of the pre-charge capacitor (C1); Alternatively, the driving circuit further comprises: an anti-reverse device (300), wherein the input end of the anti-reverse device (300) is electrically connected to the positive electrode (U+) of the driving power supply, and the output end of the anti-reverse device (300) is electrically connected to the first end of the pre-charge capacitor (C1); Alternatively, the drive circuit further comprises: an anti-reverse device (300), the input end of the anti-reverse device (300) being electrically connected to the positive electrode (U+) of the drive power supply, and the output end of the anti-reverse device (300) being electrically connected to both the power input end of the upper bridge arm drive unit (110) and the first end of the pre-charge capacitor (C1).

3. The driving circuit according to claim 1, wherein: The driving circuit further comprises: a current limiting device (200) and an anti-reverse device (300) connected in series, wherein: The current limiting device (200) is connected in series between the positive electrode (U+) of the driving power supply and the input end of the anti-reverse device (300), and the output end of the anti-reverse device (300) is electrically connected to the power input end of the upper bridge arm driving unit (110) and / or the first end of the pre-charge capacitor (C1); Alternatively, the current limiting device (200) is connected in series between the positive electrode (U+) of the driving power supply and the input end of the anti-reverse device (300), the input end of the anti-reverse device (300) is electrically connected to the power input end of the upper bridge arm driving unit (110), and the output end of the anti-reverse device (300) is electrically connected to the first end of the pre-charge capacitor (C1); Alternatively, the anti-reverse device (300) is connected in series between the positive electrode (U+) of the driving power supply and the first end of the current limiting device (200), and the second end of the current limiting device (200) is electrically connected to the power input end of the upper bridge arm driving unit (110) and the first end of the pre-charge capacitor (C1); Alternatively, the anti-reverse device (300) is connected in series between the positive electrode (U+) of the driving power supply and the first end of the current limiting device (200), and the second end of the current limiting device (200) is electrically connected to the first end of the pre-charge capacitor (C1); Alternatively, the anti-reverse device (300) is connected in series between the positive electrode (U+) of the driving power supply and the first end of the current limiting device (200), the first end of the current limiting device (200) is electrically connected to the power input end of the upper bridge arm driving unit (110), and the second end of the current limiting device (200) is electrically connected to the first end of the pre-charge capacitor (C1).

4. The driving circuit according to claim 1, wherein: The driving circuit further comprises: a voltage-stabilizing capacitor (C2), a first end of the voltage-stabilizing capacitor (C2) being electrically connected to the power output end of the lower bridge arm driving unit (120), and a second end of the voltage-stabilizing capacitor (C2) being electrically connected to the power output end of the lower bridge arm driving unit (120).

5. The driving circuit according to claim 1, wherein: At least one of the upper bridge arm driving unit (110) and the lower bridge arm driving unit (120) includes a push-pull circuit.

6. The driving circuit according to claim 5, wherein: The push-pull circuit comprises a first switch (K1) and a second switch (K2), wherein the conduction types of the first switch (K1) and the second switch (K2) are opposite; the first end of the first switch (K1) is the power input end of the bridge arm drive unit and is electrically connected to the positive electrode (U+) of the drive power supply; the second end of the first switch (K1) is electrically connected to the first end of the second switch (K2) to form the control output end of the bridge arm drive unit; and the second end of the second switch (K2) is the power output end of the bridge arm drive unit.

7. The driving circuit according to claim 1, wherein: The driving power supply includes a transformer.

8. A motor control circuit, characterized in that: The motor control circuit comprises: A power topology circuit, the power topology circuit comprising at least one phase bridge arm, the bridge arm comprising an upper bridge arm switch (M1) and a lower bridge arm switch (M2) connected in series, and the connection point between the upper bridge arm switch (M1) and the lower bridge arm switch (M2) being the midpoint of the bridge arm; At least one drive circuit, one of the drive circuits is electrically connected to the bridge arm of one phase, wherein the drive circuit is the drive circuit according to any one of claims 1 to 7.

9. The motor control circuit according to claim 8, characterized in that: The driving power supplies of all the driving circuits are the same power supply.

10. The motor control circuit according to claim 8, wherein: At least one of the upper arm switch (M1) and the lower arm switch (M2) is an IGBT or a MOS.

11. A means of transport, characterized in that: The vehicle comprises the motor control circuit according to any one of claims 8 to 10.

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