CN219287396U - Motor drive circuit and electric equipment - Google Patents

Abstract

The utility model discloses a motor driving circuit and electric equipment. The circuit comprises five bridge arms which are arranged in parallel between the positive pole and the negative pole of a direct current bus, wherein the first bridge arm and the second bridge arm are connected with a first phase and a second phase of a first motor, the fourth bridge arm and the fifth bridge arm are connected with the first phase and the second phase of a second motor, the third bridge arm is a common bridge arm, and the third bridge arm is connected with the third phase of the first motor and the third phase of the second motor; the circuit further includes: and the redundant bridge arms are arranged between the positive pole and the negative pole of the direct current bus in parallel with the five bridge arms and are used for switching connection states according to the number of the fault bridge arms after at least one bridge arm of the five bridge arms fails, so as to replace the fault bridge arms to drive the first motor and/or the second motor to operate. The utility model can avoid the problem that the motor is completely stopped due to the failure of the bridge arm, and improve the stability of the electric equipment.

Description

Motor drive circuit and electric equipment

Technical Field

The utility model relates to the technical field of electronic power, in particular to a motor driving circuit and electric equipment.

Background

With the development of industrial intelligence in recent years, many electric devices (electric vehicles, locomotive traction, heating and ventilation devices, etc.) require cooperative work and control of multiple motors, so driving of multiple motors and control strategies thereof are becoming hot spots of research in recent years. For synchronous control of double motors, in research literature in various related fields, the scheme of five-bridge arm direct drive of the two motors is mature, and the method has the characteristics of wide speed regulation range and high regulation robustness. However, in practical application, multiple bridge arms are easy to fail, so that the motor is stopped, and the safety and reliability of the driving circuit are reduced.

Aiming at the problems that in the prior art, multiple bridge arms of a motor driving circuit are easy to fail, so that the motor is stopped completely and the safety and reliability of the driving circuit are reduced, no effective solution is proposed at present.

Disclosure of Invention

The embodiment of the utility model provides a motor driving circuit and electric equipment, which are used for solving the problems that in the prior art, a plurality of bridge arms of the motor driving circuit are easy to fail, so that the motor is stopped, and the safety and reliability of the driving circuit are reduced.

In order to solve the technical problems, the utility model provides a motor driving circuit, which comprises five bridge arms arranged in parallel between a positive pole and a negative pole of a direct current bus, wherein a first bridge arm and a second bridge arm are connected with a first phase and a second phase of a first motor, a fourth bridge arm and a fifth bridge arm are connected with the first phase and the second phase of a second motor, a third bridge arm is a common bridge arm and is connected with a third phase of the first motor and a third phase of the second motor;

the circuit further comprises: and the redundant bridge arms are arranged between the positive pole and the negative pole of the direct current bus in parallel with the five bridge arms and are used for switching connection states according to the number of the fault bridge arms after at least one bridge arm of the five bridge arms fails, so as to replace the fault bridge arms to drive the first motor and/or the second motor to operate.

Further, the redundant bridge arm includes:

the source electrode of the first redundancy switch tube is respectively connected with the first phase, the second phase and the third phase of the first motor through a first switch, a second switch and a third switch which are arranged in parallel, and the drain electrode of the second redundancy switch tube is respectively connected with the first phase and the second phase of the second motor through a fourth switch and a fifth switch which are arranged in parallel.

Further, the circuit further comprises:

the switching module is arranged between the first motor and the second motor and used for controlling the switching of the connection relation between the first bridge arm and the first motor or the second motor, the switching of the connection relation between the second bridge arm and the first motor or the second motor, the switching of the connection relation between the fourth bridge arm and the first motor or the second motor and the switching of the connection relation between the fifth bridge arm and the first motor or the second motor.

Further, the switching module includes:

a sixth switch, a first end of which is connected between two switching tubes of the second bridge arm, and a second end of which is connected between two switching tubes of the fifth bridge arm;

a seventh switch, a first end of which is connected between two switching tubes of the first bridge arm, and a second end of which is connected between two switching tubes of the fifth bridge arm;

an eighth switch, a first end of which is connected between two switching tubes of the second bridge arm, and a second end of which is connected between two switching tubes of the fourth bridge arm;

and a ninth switch, a first end of which is connected between the two switching tubes of the first bridge arm, and a second end of which is connected between the two switching tubes of the fourth bridge arm.

Further, the circuit further comprises:

a tenth switch, wherein the first end of the tenth switch is connected with the positive electrode and the negative electrode of the direct current bus through a first capacitor and a second capacitor respectively; the second end of the first motor is respectively connected with the third phase of the first motor and the third phase of the second motor.

The utility model also provides electric equipment, which comprises the first motor and the second motor, and the electric equipment further comprises the motor driving circuit.

By adopting the technical scheme, when the bridge arm of the driving circuit fails, the connection state is switched according to the number of the failed bridge arm, so that the first motor and/or the second motor are/is driven to run instead of the failed bridge arm, the problem that the motors are completely stopped due to the failure of the bridge arm can be avoided, and the stability of electric equipment is improved.

Drawings

Fig. 1 is a structural diagram of a motor driving circuit according to an embodiment of the present utility model;

FIG. 2 is a block diagram of a drive circuit when the failed leg is a common leg;

FIG. 3 is a block diagram of a drive circuit when the failed leg is a non-common leg;

FIG. 4 is a diagram of a driving circuit in a four-arm one-to-two mode according to an embodiment of the present utility model;

fig. 5 is a driving circuit diagram of the case where the number of the fault bridge arms is two according to the embodiment of the present utility model;

fig. 6 is a driving circuit diagram of the number of fault bridge arms according to another embodiment of the present utility model when two fault bridge arms are provided;

fig. 7 is a driving circuit diagram of a case where the number of failed bridge arms is two according to still another embodiment of the present utility model;

FIG. 8 is a driving circuit diagram of a fault bridge arm according to an embodiment of the present utility model when the number of the fault bridge arms is three;

fig. 9 is a driving circuit diagram of the number of the fault bridge arms according to another embodiment of the present utility model when three.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The terminology used in the embodiments of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, the "plurality" generally includes at least two.

It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

It should be understood that although the terms first, second, third, etc. may be used to describe the switches in embodiments of the present utility model, these switches should not be limited to these terms. These terms are only used to distinguish between different switches. For example, a first switch may also be referred to as a second switch, and similarly, a second switch may also be referred to as a first switch, without departing from the scope of embodiments of the present utility model.

The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or device comprising such element.

Alternative embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

Example 1

The embodiment provides a motor driving circuit, fig. 1 is a structural diagram of the motor driving circuit according to the embodiment of the utility model, as shown in fig. 1, the circuit includes five bridge arms which are arranged in parallel between a positive pole and a negative pole of a direct current bus, the first bridge arm includes a switch tube Q1 and a switch tube Q6, a line between the switch tube Q1 and the switch tube Q6 is connected with a first phase of a first motor M1, the second bridge arm includes a switch tube Q2 and a switch tube Q7, a line between the switch tube Q2 and the switch tube Q7 is connected with a second phase of the first motor M1, the fourth bridge arm includes a switch tube Q4 and a switch tube Q9, a line between the switch tube Q4 and the switch tube Q9 is connected with a first phase of a second motor M2, the fifth bridge arm includes a switch tube Q5 and a switch tube Q10, a line between the switch tube Q5 and the switch tube Q10 is connected with a second phase of the second motor M2, and the third bridge arm is a common bridge arm, and the line between the switch tube Q3 and the switch tube Q8 is connected with a second phase of the first motor M1 and a third phase of the second motor M2.

As shown in fig. 1, the above circuit further includes: the redundant bridge arms are arranged between the positive pole and the negative pole of the direct current bus in parallel with the five bridge arms and are used for switching connection states according to the number of the fault bridge arms after at least one bridge arm of the five bridge arms fails, so that the fault bridge arms are replaced to drive the first motor M1 and/or the second motor M2 to operate.

According to the motor driving circuit, through the arrangement of the redundant bridge arms, when the bridge arms of the driving circuit fail, the connection state is switched according to the number of the failed bridge arms, so that the first motor M1 and/or the second motor M2 are/is driven to run instead of the failed bridge arms, the problem that the motors are all stopped due to the failure of the bridge arms can be avoided, and the stability of electric equipment is improved.

In order to enable the redundancy bridge arm to be multipurpose, as shown in fig. 1, the redundancy bridge arm includes: the source electrode of the first redundant switch tube Q11 is respectively connected with the first phase, the second phase and the third phase of the first motor M1 through a first switch Qk1, a second switch Qk2 and a third switch Qk3 which are arranged in parallel, and the drain electrode of the second redundant switch tube Q12 is respectively connected with the first phase and the second phase of the second motor M2 through a fourth switch Qk4 and a fifth switch Qk5 which are arranged in parallel.

In order to drive the first motor and the second motor by the first bridge arm, the second bridge arm, the fourth bridge arm and the fifth bridge arm, so as to realize full utilization of the normal bridge arm, the circuit further comprises: the switching module is arranged between the first motor M1 and the second motor M2 and is used for controlling the switching of the connection relation between the first bridge arm and the first motor M1 or the second motor M2, the switching of the connection relation between the second bridge arm and the first motor M1 or the second motor M2, the switching of the connection relation between the fourth bridge arm and the first motor M1 or the second motor M2 and the switching of the connection relation between the fifth bridge arm and the first motor M1 or the second motor M2.

Specifically, the switching module includes: a sixth switch Qk6, a first end of which is connected between two switching tubes of the second bridge arm, and a second end of which is connected between two switching tubes of the fifth bridge arm; a seventh switch Qk7, a first end of which is connected between two switching tubes of the first bridge arm, and a second end of which is connected between two switching tubes of the fifth bridge arm; an eighth switch Qk8, a first end of which is connected between two switching tubes of the second bridge arm, and a second end of which is connected between two switching tubes of the fourth bridge arm; and a first end of the ninth switch Qk9 is connected between the two switching tubes of the first bridge arm, and a second end of the ninth switch Qk9 is connected between the two switching tubes of the fourth bridge arm.

In order to realize the simultaneous operation of two motors driven by four bridge arms, the circuit further comprises: a tenth switch Qc, the first end of which is connected with the positive pole and the negative pole of the DC bus through the first capacitor C1 and the second capacitor C2 respectively; and the second end of the first motor M1 is respectively connected with the third phase of the first motor M1 and the third phase of the second motor M2.

The CPU outputs control signals S1-Sc to control the on-off of the first switch to the tenth switch.

If at least one of the five bridge arms fails, the connection state of the redundant bridge arm is controlled according to the number of the failed bridge arms, and the first motor and/or the second motor are/is driven to run instead of the failed bridge arm.

If the five bridge arms of the motor driving circuit are not in failure, the five bridge arms are controlled to be normally connected, so that the motor driving circuit drives the two motors to run simultaneously.

Specifically, the method for controlling the connection state of the redundant bridge arm according to the number of the fault bridge arm to replace the fault bridge arm to drive the first motor and/or the second motor to operate includes: if the number of the fault bridge arms is one, the redundant bridge arms can just replace the fault bridge arms to work, so that the access of the redundant bridge arms is controlled to replace the fault bridge arms.

Fig. 2 is a block diagram of a driving circuit when the fault bridge arm is a common bridge arm, and bold lines in the diagram are conductive lines, as shown in fig. 2, the fault bridge arm is a third bridge arm, and the redundant bridge arm is connected to third phases of the first motor M1 and the second motor M2 through a third switch Qk3 to replace the third bridge arm.

Fig. 3 is a schematic diagram of a driving circuit when the fault bridge arm is a non-common bridge arm, and as shown in fig. 3, the fault bridge arm is a fifth bridge arm, and the redundant bridge arm is connected to the second phase of the second motor M2 through a fifth switch Qk5 to replace the third bridge arm.

If the number of the fault bridge arms is two and the fault bridge arms comprise a common bridge arm, only one common bridge arm is indicated to have a fault, so that after the common bridge arm is replaced by the redundant bridge arm, four bridge arms can normally operate and the common bridge arm is included, so that a one-to-two driving mode of the four bridge arms can be realized, and if the number of the fault bridge arms is two, whether the fault bridge arms comprise the common bridge arm is judged, and then the connection state of the redundant bridge arms is controlled according to the judging result; if the fault bridge arm comprises a public bridge arm, judging whether the operation of the double motors needs to be controlled; if the double motors are required to operate, controlling the redundant bridge arm to be connected to replace a failed non-public bridge arm to operate, simultaneously controlling the tenth switch to be connected, connecting the third phase of the first motor and the third phase of the second motor to a neutral point N between the positive electrode and the negative electrode of the direct current bus, switching the motor driving circuit into a four-arm one-to-two mode, and driving the first motor and the second motor to operate simultaneously; the first end of the tenth switch is connected with the anode and the cathode of the direct current bus through a first capacitor and a second capacitor respectively; the second end is respectively connected with a third phase of the first motor and a third phase of the second motor.

Fig. 4 is a driving circuit diagram in a four-arm one-to-two mode according to an embodiment of the present utility model, as shown in fig. 4, the fault bridge arm is a third bridge arm and a fourth bridge arm, the redundant bridge arm is connected to the first phase of the second motor M2 through the fourth switch Qk4 to replace the fourth bridge arm to work, and meanwhile, the tenth switch Qc is turned on to connect the third phase of the first motor and the third phase of the second motor to the neutral point N between the positive pole and the negative pole of the dc bus.

If the double motors are not required to operate, the redundant bridge arm is controlled to be connected with the motors connected with the two normal bridge arms, and the bridge arm connected with the other motor is controlled not to be connected with the motors.

Fig. 5 is a driving circuit diagram when the number of fault bridge arms is two, as shown in fig. 5, the fault bridge arms are a third bridge arm and a fifth bridge arm, the first bridge arm, the second bridge arm and the fourth bridge arm are intact, at this time, the fourth bridge arm is turned off, the third switch Qk3 is turned on, and the redundant bridge arm is accessed to the third phase of the first motor M1 through the third switch Qk3 to control the first motor M1 to operate independently.

If the fault bridge arm does not comprise the public bridge arm, judging whether the three normal bridge arms are connected with the three phases of the same motor, and if the three normal bridge arms are connected with the three phases of the same motor, controlling the redundant bridge arms not to be connected, and controlling the three normal bridge arms to keep the current connection state.

Fig. 6 is a driving circuit diagram when the number of fault bridge arms is two according to another embodiment of the present utility model, as shown in fig. 6, the fault bridge arms are a fourth bridge arm and a fifth bridge arm, the redundant bridge arms are not connected, and the first motor M1 is driven to operate independently through the first bridge arm, the second bridge arm and the third bridge arm.

If the three normal bridge arms are not connected with the three phases of the same motor, the three normal bridge arms are controlled to be connected with the motor with shorter running time.

Fig. 7 is a driving circuit diagram when the number of fault bridge arms is two according to another embodiment of the present utility model, as shown in fig. 7, if the fault bridge arms are a second bridge arm and a fifth bridge arm, and the operation time of the first motor M1 is shorter, the eighth switch Qk8 is controlled to be turned on, and the fourth bridge arm is connected to the second phase of the first motor M1 through the eighth switch Qk8, so as to control the first motor to operate independently.

If the running time of the second motor M2 is shorter, the seventh switch Qk7 is controlled to be conducted, the first bridge arm is connected into the second phase of the second motor M1 through the seventh switch Qk7, and the second motor is controlled to run independently.

If the number of the fault bridge arms is three, judging whether the two normal bridge arms are connected with two phases of the same motor, and then controlling the connection state of the redundant bridge arms according to the judging result. The method specifically comprises the following steps:

and if the two normal bridge arms are connected with two phases of the same motor, controlling the redundant bridge arms to be connected into a third phase of the motor.

Fig. 8 is a driving circuit diagram when the number of fault bridge arms is three according to an embodiment of the present utility model, as shown in fig. 8, the fault bridge arms are a first bridge arm, a fourth bridge arm and a fifth bridge arm, the redundant bridge arm is connected to a first phase of the first motor M1 through a first switch Qk1, and the first motor is driven to operate independently through a second bridge arm, a third bridge arm and the redundant bridge arm.

And if the two normal bridge arms are respectively connected with one phase of the first motor and the second motor, controlling the two normal bridge arms and the redundant bridge arms to be connected with the motors with shorter operation duration.

Fig. 9 is a driving circuit diagram when the number of fault bridge arms is three according to another embodiment of the present utility model, as shown in fig. 9, the fault bridge arms are a second bridge arm, a third bridge arm and a fifth bridge arm, and the operation duration of the first motor M1 is relatively short, the third switch Qk3 is controlled to be turned on, the redundant bridge arm is connected to the third phase of the first motor M1 through the third switch Qk3, the eighth switch Qk8 is turned on, the fourth bridge arm is connected to the second phase of the first motor M1 through the eighth switch Qk8, and the first motor M1 is driven to operate independently through the first bridge arm, the fourth bridge arm and the redundant bridge arm.

Similarly, if the operation duration of the second motor M2 is relatively short, the third switch Qk3 is controlled to be turned on, the redundant bridge arm is connected to the third phase of the second motor M2 through the third switch Qk3, the eighth switch Qk8 is turned on, the first bridge arm is connected to the second phase of the second motor M2 through the seventh switch Qk7, and the second motor M2 is driven to operate independently through the first bridge arm, the fourth bridge arm and the redundant bridge arm.

If the number of the fault bridge arms is four or more, the situation that the number of the fault bridge arms is too large and single motor driving cannot be realized can be known, and the driving circuit is controlled to stop working.

Example 2

The embodiment provides electric equipment, including first motor M1 and second motor M2, the electric equipment still includes the motor drive circuit of above-mentioned embodiment for avoid the bridge arm to break down the problem that leads to the motor to shut down entirely, improve the stability of electric equipment.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims (6)

1. The motor driving circuit is characterized by comprising five bridge arms which are arranged in parallel between a positive pole and a negative pole of a direct current bus, wherein a first bridge arm and a second bridge arm are connected with a first phase and a second phase of a first motor, a fourth bridge arm and a fifth bridge arm are connected with the first phase and the second phase of a second motor, a third bridge arm is a common bridge arm, and the third bridge arm is connected with a third phase of the first motor and a third phase of the second motor;

the circuit further comprises: and the redundant bridge arms are arranged between the positive pole and the negative pole of the direct current bus in parallel with the five bridge arms and are used for switching connection states according to the number of the fault bridge arms after at least one bridge arm of the five bridge arms fails, so as to replace the fault bridge arms to drive the first motor and/or the second motor to operate.

2. The circuit of claim 1, wherein the redundant leg comprises:

the source electrode of the first redundancy switch tube is respectively connected with the first phase, the second phase and the third phase of the first motor through a first switch, a second switch and a third switch which are arranged in parallel, and the drain electrode of the second redundancy switch tube is respectively connected with the first phase and the second phase of the second motor through a fourth switch and a fifth switch which are arranged in parallel.

3. The circuit of claim 1, wherein the circuit further comprises:

the switching module is arranged between the first motor and the second motor and used for controlling the switching of the connection relation between the first bridge arm and the first motor or the second motor, the switching of the connection relation between the second bridge arm and the first motor or the second motor, the switching of the connection relation between the fourth bridge arm and the first motor or the second motor and the switching of the connection relation between the fifth bridge arm and the first motor or the second motor.

4. A circuit according to claim 3, wherein the switching module comprises:

a sixth switch, a first end of which is connected between two switching tubes of the second bridge arm, and a second end of which is connected between two switching tubes of the fifth bridge arm;

a seventh switch, a first end of which is connected between two switching tubes of the first bridge arm, and a second end of which is connected between two switching tubes of the fifth bridge arm;

an eighth switch, a first end of which is connected between two switching tubes of the second bridge arm, and a second end of which is connected between two switching tubes of the fourth bridge arm;

and a ninth switch, a first end of which is connected between the two switching tubes of the first bridge arm, and a second end of which is connected between the two switching tubes of the fourth bridge arm.

5. The circuit of claim 1, wherein the circuit further comprises:

a tenth switch, wherein the first end of the tenth switch is connected with the positive electrode and the negative electrode of the direct current bus through a first capacitor and a second capacitor respectively; the second end of the first motor is respectively connected with the third phase of the first motor and the third phase of the second motor.

6. A powered device comprising a first motor and a second motor, wherein the powered device further comprises a motor drive circuit as recited in any one of claims 1-5.

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