CN110752813B - Motor driver and protection method for power supply loss of motor driver - Google Patents
Motor driver and protection method for power supply loss of motor driver Download PDFInfo
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- CN110752813B CN110752813B CN201911003277.9A CN201911003277A CN110752813B CN 110752813 B CN110752813 B CN 110752813B CN 201911003277 A CN201911003277 A CN 201911003277A CN 110752813 B CN110752813 B CN 110752813B
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- 230000033228 biological regulation Effects 0.000 claims abstract description 13
- 230000003313 weakening effect Effects 0.000 claims abstract description 13
- 230000000737 periodic effect Effects 0.000 claims abstract description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000006641 stabilisation Effects 0.000 claims description 4
- 238000011105 stabilization Methods 0.000 claims description 4
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- 238000010586 diagram Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/025—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being a power interruption
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/0086—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for high speeds, e.g. above nominal speed
- H02P23/009—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for high speeds, e.g. above nominal speed using field weakening
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
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- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a motor driver and a method for protecting power supply loss of the motor driver. Wherein, the protection method of the power supply loss of the motor driver protects the controller and the motor when the power supply end of the motor driver of the brushless direct current motor works in a field weakening speed regulation mode and has power supply loss, when the voltage is reduced to a first preset voltage, the inverter bridge is controlled to work correspondingly to carry out periodic short circuit and open circuit control on the motor winding, the rotating speed of the motor is reduced, meanwhile, the generated back electromotive force charges the bus capacitor, the voltage of the direct current bus rises, when the voltage of the direct current bus rises to a second preset voltage, the inverter bridge is controlled to work correspondingly to carry out short circuit control on the motor winding, further controlling the DC bus voltage to drop to a third preset voltage, preventing the bus capacitor and the voltage dropping circuit from being damaged by overhigh bus voltage, therefore, the problem that the conventional protection method fails when the brushless direct current motor is in a weak magnetic state and power supply is lost is solved.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a motor driver and a protection method for power supply loss of the motor driver.
Background
Brushless dc motor is widely used in household appliances industry, such as fan, range hood, compressor, washing machine, food processor, etc. because of its high power and high efficiency. Some applications require brushless dc motors to have a wide range of speed regulation, such as washing machines, food processors, etc.
The brushless dc motor working under the mains voltage generally adopts ac power supply, the front end rectifier bridge rectifies the ac voltage, and the rectified voltage is filtered by a large-capacity bus capacitor to become dc voltage. The voltage on the bus capacitor is divided into two paths, one path of voltage is reduced and then is supplied to the main controller, and the other path of voltage is supplied to the inverter bridge.
When the brushless direct current motor is in a field weakening operation state, the rotating speed is very high and can reach 1-5 times of the maximum rotating speed without field weakening control. If the power supply end fails or power failure occurs at the moment, the main controller directly shuts off output according to a conventional protection method I. At the moment, the motor rotates freely, the generated counter potential is far higher than the withstand voltage limit of the bus capacitor and the DC-DC voltage reduction module, so that the device is damaged, and more serious fire can be caused. If the main controller controls the inverter bridge to work correspondingly according to a conventional protection method II so as to perform short circuit control on the motor winding, the counter electromotive force generated by the motor cannot charge the capacitor, and the voltage of the bus capacitor cannot exceed the rated withstand voltage. However, at this time, the energy stored in the bus capacitor is quickly consumed by the main controller, and once the energy stored in the capacitor is consumed by the main controller, the main controller loses the control of the motor, and as a result, the device is damaged.
Disclosure of Invention
The invention mainly aims to provide a protection method for power supply loss of a motor driver, and aims to solve the problem that a conventional protection method fails when the brushless direct current motor is in a weak magnetic state and power supply loss occurs.
In order to achieve the above object, the present invention provides a method for protecting a power supply deficiency of a driver, which is used for a motor driver, wherein the motor driver has a first control mode for controlling a brushless dc motor to work in a field weakening speed regulation state, the motor driver comprises a power input port, a bus capacitor, an inverter bridge and a control circuit, the power input port is connected with the bus capacitor through a dc bus, the bus capacitor, the inverter bridge and the brushless dc motor are sequentially connected, a power source end of the control circuit is connected with the dc bus, and a control end of the control circuit is connected with a controlled end of the inverter bridge; the protection method for the power supply loss of the motor driver comprises the following steps:
acquiring the voltage of the direct current bus;
when the voltage drop value of the voltage of the direct current bus in a preset time from the working voltage is larger than a preset voltage, determining that the power supply of the power supply input end is lost;
when the voltage of the direct current bus falls from the working voltage to a first preset voltage, controlling the inverter bridge to work correspondingly so as to perform periodic short circuit and open circuit control on a winding of the brushless direct current motor and further control the voltage of the direct current bus to rise;
and when the voltage of the direct current bus rises to a second preset voltage, controlling the inverter bridge to work correspondingly so as to perform short circuit control on the winding of the brushless direct current motor, and further controlling the voltage of the direct current bus to fall to a third preset voltage.
Preferably, the second preset voltage is greater than a third preset voltage, the third preset voltage is greater than the working voltage, and the working voltage is greater than the first preset voltage.
Preferably, the step of controlling the inverter bridge to work correspondingly to perform periodic short-circuit and open-circuit control on the winding of the brushless dc motor, and further controlling the voltage rise of the dc bus specifically includes:
controlling an upper bridge arm switch of the inverter bridge to be turned off, and periodically short-circuiting and opening a lower bridge arm switch at a preset duty ratio;
or, the upper and lower bridge arm switches of the inverter bridge are controlled to be periodically short-circuited and opened at a preset duty ratio alternately in a preset time period respectively.
Preferably, the inverter bridge has a short circuit and an open circuit with a period of 20us to 200 us.
Preferably, the duty cycle of the short circuit time is 0.5% to 99%.
The invention also provides a motor driver, which is provided with a first control mode for controlling the brushless direct current motor to work in a field weakening speed regulation state, and comprises a power supply input port, a bus capacitor, an inverter bridge and a control circuit, wherein the power supply input port is connected with the bus capacitor through a direct current bus, the bus capacitor, the inverter bridge and the brushless direct current motor are sequentially connected, a power supply end of the control circuit is connected with the direct current bus, and a control end of the control circuit is connected with a controlled end of the inverter bridge; and
the voltage acquisition circuit is used for acquiring the voltage of the direct current bus;
the control circuit comprises a processor, a memory and a motor driver power supply missing protection program stored in the memory, and when the motor driver power supply missing protection program is executed by the processor, the steps of the motor driver power supply missing protection method are realized.
Preferably, the processor comprises a main controller and a gate driver, a signal end of the main controller is respectively connected with a signal end of the voltage acquisition circuit and a signal end of the gate driver, and a power supply end of the main controller is connected with the direct current bus;
the main controller is used for outputting a corresponding control signal to the grid driver according to the voltage signal of the direct current bus acquired by the voltage acquisition circuit;
and the grid driver is used for correspondingly outputting a bridge arm switch control signal to the inverter bridge according to the control signal output by the main controller.
Preferably, the processor further comprises a voltage stabilizing circuit, a power input end of the voltage stabilizing circuit is connected with the direct current bus, and a power output end of the voltage stabilizing circuit is connected with a power end of the main controller;
the voltage stabilizing circuit is used for performing voltage conversion and voltage stabilization on the voltage of the direct current bus and outputting a first working voltage to the main controller.
Preferably, the gate driver and the inverter bridge are integrally provided.
Preferably, the motor driver further comprises a rectifying circuit, wherein a power supply input end of the rectifying circuit inputs alternating current, and a power supply output end of the rectifying circuit is connected with the power supply input port;
the rectifying circuit is used for rectifying the alternating current and outputting a direct current power supply to the direct current bus.
The technical scheme of the invention is that when a brushless direct current motor works in a field weakening and speed regulation state, when the power supply end of a motor driver is in power supply loss, the brushless direct current motor protects the controller and the motor, controls an inverter bridge to work correspondingly to perform periodic short-circuit and open-circuit control on a motor winding when the voltage drops to a first preset voltage, reduces the rotating speed of the motor, simultaneously charges a bus capacitor by using the generated back electromotive force, increases the voltage of a direct current bus to ensure that enough voltage drives a control circuit to work, controls the inverter bridge to work correspondingly to perform short-circuit control on the motor winding when the voltage of the direct current bus rises to a second preset voltage, further controls the voltage of the direct current bus to drop to a third preset voltage, prevents the bus capacitor and a voltage dropping circuit from being damaged by overhigh voltage, and further controls the voltage of the direct current bus to change between the second preset voltage and the third preset voltage until the motor stops rotating, therefore, the problem that the conventional protection method fails when the brushless direct current motor is in a weak magnetic state and power supply is lost is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a block diagram of a motor drive according to an embodiment of the present invention;
FIG. 2 is a schematic voltage curve diagram illustrating an embodiment of a method for protecting a motor driver from power loss according to the present invention;
FIG. 3 is a flowchart illustrating an embodiment of a method for protecting a motor driver from power loss according to the present invention;
fig. 4 is a block diagram of another embodiment of the motor driver of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the descriptions relating to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is: the method comprises three parallel schemes, wherein the scheme is taken as an A/B (A/B) as an example, the scheme comprises the scheme A, the scheme B or the scheme A and the scheme B simultaneously satisfy, in addition, the technical schemes between the various embodiments can be combined with each other, but the technical schemes must be based on the realization of the technical schemes by a person skilled in the art, and when the technical schemes are mutually contradictory or can not be realized, the combination of the technical schemes is not considered to exist, and the protection scope of the invention is not within the protection scope of the invention.
The invention provides a method for protecting a motor driver from power supply loss, which is used for the motor driver, wherein the motor driver is provided with a first control mode for controlling a brushless direct current motor 300 to work in a field weakening speed regulation state, and can understand that the motor driver is also provided with other control modes for controlling the brushless direct current motor 300 to work in other speed regulation states, such as a second control mode for controlling the brushless direct current motor 300 to be in soft start, and the like.
As shown in fig. 1, the motor driver includes a power input port (DC +, DC-), a bus capacitor C1, an inverter bridge 100, and a control circuit 200, where the power input port is connected to the bus capacitor C1 through a DC bus, the bus capacitor C1, the inverter bridge 100, and the brushless DC motor 300 are sequentially connected, a power source end of the control circuit 200 is connected to the DC bus, and a control end of the control circuit 200 is connected to a controlled end of the inverter bridge 100.
In this embodiment, the bus capacitor C1 is connected in parallel to a dc bus, the control circuit 200 is powered by the dc bus, the dc bus is connected to the inverter bridge 100, the inverter bridge 100 performs inversion conversion on the input dc to output three-phase ac power to the brushless dc motor 300, the inverter bridge 100 includes upper arm switches Q1, Q3, Q5 and lower arm switches Q2, Q4, and Q6, which are symmetrically arranged, and the connection points of the upper arm switches and the lower arm switches are connected to corresponding windings of the brushless dc motor 300, and the control circuit 200 correspondingly outputs multiple paths of PWM signals to the inverter bridge 100 according to a trigger signal to control the inverter bridge 100 to operate.
It should be noted that, when the output frequency of the frequency converter is higher than the rated frequency of the motor, the magnetic flux Φ of the iron core of the motor starts to weaken, the rotational speed of the motor is higher than the rated rotational speed, at this time, we call that the motor enters a field weakening speed regulation state, at this time, a power supply end fault occurs, or when a power failure occurs, if the control circuit 200 directly turns off the output according to a conventional protection method, at this time, the motor freely rotates, the generated counter potential is far higher than the withstand voltage limit of the bus capacitor C1, which causes device damage, and more serious ignition. If the control circuit 200 controls the inverter bridge to work correspondingly according to the second conventional protection method to perform short-circuit control on the motor winding, the counter potential generated by the motor cannot charge the bus capacitor C1, and the voltage of the bus capacitor C1 cannot exceed the rated withstand voltage. However, at this time, the control circuit 200 consumes the energy stored in the bus capacitor C1 quickly, and once the control circuit 200 consumes the energy stored in the bus capacitor C1, the control circuit 200 loses the control of the motor, and as a result, the device is damaged.
Therefore, the present invention provides a method for protecting a power supply loss of a motor driver to solve the problem that a conventional protection method fails when the brushless dc motor 300 is in a weak magnetic state, as shown in fig. 2 and 3, the method for protecting the power supply loss of the motor driver includes:
s10, acquiring the voltage of the direct current bus;
s20, when the voltage drop value of the voltage of the direct current bus in the preset time from the working voltage U0 is larger than the preset voltage, determining that the power supply of the power supply input end is lacked;
s30, when the voltage of the direct current bus falls to a first preset voltage U1 from a working voltage U0, controlling the inverter bridge 100 to work correspondingly so as to perform periodic short circuit and open circuit control on the winding of the brushless direct current motor 300 and further control the voltage of the direct current bus to rise;
and S40, when the voltage of the direct current bus rises to a second preset voltage U2, controlling the inverter bridge 100 to work correspondingly to perform short circuit control on the winding of the brushless direct current motor 300, and further controlling the voltage of the direct current bus to fall to a third preset voltage U3.
When the brushless direct current motor 300 works in a field weakening speed regulation state and the power supply end supplies power normally, the direct current bus voltage is kept at the working voltage U0, when the power supply end is lack of power supply to cause the direct current bus voltage to drop, when the direct current bus voltage drops to a first preset voltage U1, the system enters a protection program, the inverter bridge 100 is controlled to periodically short and open the winding of the brushless direct current motor 300, at the moment, the upper bridge arm switch of the inverter bridge 100 can be controlled to be turned off, the lower bridge arm switch is periodically short and open at a preset duty ratio, or the upper bridge arm switch and the lower bridge arm switch of the inverter bridge 100 are controlled to be periodically short and open at a preset duty ratio alternately in a preset time period respectively, wherein the period of the short circuit and the open circuit of the inverter bridge 100 is 20us to 200 us. The duty cycle of the short circuit time is 0.5% to 99%, and can be set and adjusted according to requirements.
Specifically, the control circuit 200 controls the lower arm switches (Q2, Q4, Q6) of the inverter bridge 100 to be simultaneously turned on for a period of time and then turned off for a period of time, when the lower arm switches are in the on-phase, the energy generated by the brushless dc motor 300 is consumed by the windings of the lower arm switches, the back electromotive force generated by the brushless dc motor 300 is suppressed, the brushless dc motor 300 continuously decelerates at this time, when the lower arm switches are turned off, the back electromotive force generated by the brushless dc motor 300 is much higher than the bus voltage, so that the bus voltage rises by charging the dc capacitor, and at this time, the duty ratio of turning on and off the arm switches is controlled to control the rising slope of the bus voltage.
When the voltage rises to the second preset voltage U2, in order to avoid the damage of the bus capacitor C1 and the control circuit 200 caused by the overhigh voltage, at this time, the lower bridge of the inverter bridge 100 needs to be controlled to be conducted, the winding short circuit of the brushless dc motor 300 is suppressed, the back electromotive force is charged to the bus capacitor C1, after the winding of the brushless dc motor 300 is short-circuited, the bus voltage drops, when the voltage drops to the third preset voltage U3, the inverter bridge 100 is switched to the intermittent short circuit and open circuit state again to raise the bus voltage, so that the dc bus voltage is maintained between the third preset voltage U3 and the second preset voltage U2, and it is ensured that after the power supply loss, the dc bus can continue to supply power to the control circuit 200, so that the control circuit 200 can continue to operate, and at the same time, the brushless dc motor 300 is forced to be rapidly.
The second preset voltage U2 is greater than a third preset voltage U3, the third preset voltage U3 is greater than the working voltage U0, and the working voltage U0 is greater than the first preset voltage U1.
The technical scheme of the invention is that when the brushless DC motor 300 works in a field weakening speed regulation mode and the power supply end of a motor driver is in power supply loss, voltage detection and voltage protection are carried out, the voltage is reduced to a first preset voltage U1, the inverter bridge 100 is controlled to work correspondingly to carry out periodic short circuit and open circuit control on the winding of the brushless DC motor 300, the rotating speed of the brushless DC motor 300 is reduced, meanwhile, the generated back electromotive force can charge the bus capacitor C1, the voltage of the DC bus is increased, enough voltage is ensured to drive the control circuit 200 to work, when the voltage of the DC bus is increased to a second preset voltage U2, the inverter bridge 100 is controlled to work correspondingly to carry out short circuit control on the winding of the brushless DC motor 300, and further, the voltage of the DC bus is controlled to be reduced to a third preset voltage U3, and the bus capacitor C1 and a voltage reduction circuit are prevented from being damaged due to overhigh bus voltage, therefore, the direct-current bus voltage is controlled to change between the second preset voltage U2 and the third preset voltage U3 until the brushless direct-current motor 300 stops rotating, and the problem that the conventional protection method fails when the brushless direct-current motor 300 is in a weak magnetic state and power supply loss occurs is solved.
Correspondingly, the invention also provides a motor driver, which has a first control mode for controlling the brushless direct current motor 300 to work in a field weakening speed regulation state, and comprises a power supply input port, a bus capacitor C1, an inverter bridge 100 and a control circuit 200, wherein the power supply input port is connected with the bus capacitor C1 through a direct current bus, the bus capacitor C1, the inverter bridge 100 and the brushless direct current motor 300 are sequentially connected, a power supply end of the control circuit 200 is connected with the direct current bus, and a control end of the control circuit 200 is connected with a controlled end of the inverter bridge 100; and
a voltage acquisition circuit (not shown) for acquiring the voltage of the dc bus;
a control circuit 200, said control circuit 200 comprising a processor 210, a memory (not shown) and a motor driver power supply loss protection program stored in said memory, when said motor driver power supply loss protection program is executed by said processor 210, the steps of the motor driver power supply loss protection method as described above are implemented.
In this embodiment, the voltage acquisition circuit is connected between the dc bus and the control circuit 200, and feeds back the voltage of the dc bus to the processor 210 in the control circuit 200, the voltage acquisition circuit may be coupled to a functional voltage transformer or a resistance voltage divider circuit, when the power supply terminal supplies power normally, the dc bus voltage is kept at the working voltage U0, when the power supply terminal loses power supply and the dc bus voltage drops, and when the dc bus voltage drops to the first preset voltage U1, the system enters a protection program, at this time, the processor 210 controls the inverter bridge 100 to periodically short and open the winding of the brushless dc motor 300, at this time, the processor 210 controls the upper bridge arm switch of the inverter bridge 100 to be turned off, the lower bridge arm switch to periodically short and open the winding at the preset duty ratio, or the processor 210 controls the upper bridge arm switch and the lower bridge arm switch of the inverter bridge 100 to be periodically short and open the winding at the preset duty ratio alternately at a preset time period, wherein, the short circuit and open circuit period of the inverter bridge 100 is 20us to 200 us. The duty cycle of the short circuit time is 0.5% to 99%, and can be set and adjusted according to requirements.
Specifically, the processor 210 controls the lower arm switches (Q2, Q4, Q6) of the inverter bridge 100 to be simultaneously turned on for a period of time and then turned off for a period of time, when the lower arm switches are in the on-phase, the energy generated by the brushless dc motor 300 is consumed by the windings of the lower arm switches, the back electromotive force generated by the brushless dc motor 300 is suppressed, the brushless dc motor 300 continuously decelerates at this time, when the lower arm switches are turned off, the back electromotive force generated by the brushless dc motor 300 is much higher than the bus voltage, so that the bus voltage rises by charging the dc capacitor, and at this time, the duty ratio of the on-off of the arm switches is controlled by the processor 210, so that the rising slope of the bus voltage can be controlled.
When the voltage rises to the second preset voltage U2, in order to avoid the damage of the bus capacitor C1 and the control circuit 200 caused by the overhigh voltage, at this time, the lower bridge of the inverter bridge 100 needs to be controlled to be conducted, the winding short circuit of the brushless DC motor 300 is suppressed, the back electromotive force is charged to the bus capacitor C1, after the winding of the brushless DC motor 300 is short-circuited, the bus voltage drops, when the winding of the brushless DC motor is reduced to the third preset voltage U3, the processor 210 controls the inverter bridge 100 to be switched to the intermittent short circuit state and the open circuit state again to rise the bus voltage, so that the DC bus voltage is maintained between the third preset voltage U3 and the second preset voltage U2, and after the AC end power supply is lost, the DC-DC voltage reduction circuit can continue to supply power to the processor 210, so that the processor 210 can continue to operate, and meanwhile, the brushless DC motor 300 is.
As shown in fig. 4, the processor 210 includes a main controller 10 and a gate driver 20, a signal terminal of the main controller 10 is connected to a signal terminal of the voltage acquisition circuit and a signal terminal of the gate driver 20, respectively, and a power supply terminal of the main controller 10 is connected to the dc bus;
the main controller 10 is configured to output a corresponding control signal to the gate driver 20 according to the voltage signal of the dc bus acquired by the voltage acquisition circuit;
the gate driver 20 is configured to correspondingly output a bridge arm switch control signal to the inverter bridge 100 according to the control signal output by the main controller 10.
In this embodiment, the main controller 10 is powered by a dc bus, in order to improve safety, a voltage stabilizing circuit 30 may be disposed in the main controller 10, the main controller 10 may be a single chip microcomputer, an MCU, or the like, the main controller 10 correspondingly outputs a PWM signal to the gate driver 20 according to a voltage variation of the dc bus, and the gate driver 20 converts the PWM signal into six paths of PWM driving signals to controlled terminals of each bridge arm switch of the inverter bridge 100, so as to perform on or off control.
In an embodiment, the processor 210 further includes a voltage stabilizing circuit 30, a power input end of the voltage stabilizing circuit 30 is connected to the dc bus, and a power output end of the voltage stabilizing circuit 30 is connected to a power end of the main controller 10;
the voltage stabilizing circuit 30 is configured to perform voltage conversion and voltage stabilization on the voltage of the dc bus, and output a first working voltage U0 to the main controller 10.
In this embodiment, the voltage stabilizing circuit 30 is used for performing voltage reduction and voltage stabilization processing on the voltage of the dc bus, for example, 80V dc is converted into 12V, 5V, 3.3V voltage, and the corresponding voltage stabilizing circuit 30 can be selected according to the specific model of the main controller 10.
Further, in order to simplify the structure of the motor driver, the gate driver 20 and the inverter bridge 100 are integrally disposed to form an intelligent power module, and the main controller 10 directly outputs a control signal to the intelligent power module to drive the brushless dc motor 300 to operate.
Meanwhile, in order to improve the diversity of the motor driver, the motor driver further comprises a rectifying circuit, wherein the power supply input end of the rectifying circuit inputs alternating current, and the power supply output end of the rectifying circuit is connected with the power supply input end;
the rectifying circuit is used for rectifying the alternating current and outputting a direct current power supply to the direct current bus, and the rectifying circuit can comprise a rectifying bridge or a rectifying circuit composed of a plurality of diodes and the like, and is specifically selected according to requirements.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A protection method for power supply loss of a motor driver is used for the motor driver, the motor driver is provided with a first control mode for controlling a brushless direct current motor to work in a field weakening speed regulation state, and the protection method is characterized in that the motor driver comprises a power supply input port, a bus capacitor, an inverter bridge and a control circuit, wherein the power supply input port is connected with the bus capacitor through a direct current bus, the bus capacitor, the inverter bridge and the brushless direct current motor are sequentially connected, a power supply end of the control circuit is connected with the direct current bus, and a control end of the control circuit is connected with a controlled end of the inverter bridge; the protection method for the power supply loss of the motor driver comprises the following steps:
acquiring the voltage of the direct current bus;
when the voltage drop value of the voltage of the direct current bus in a preset time from the working voltage is larger than a preset voltage, determining that the power supply of the power supply input end is lost;
when the voltage of the direct current bus falls from the working voltage to a first preset voltage, controlling the inverter bridge to work correspondingly so as to perform periodic short circuit and open circuit control on a winding of the brushless direct current motor and further control the voltage of the direct current bus to rise;
when the voltage of the direct current bus rises to a second preset voltage, controlling the inverter bridge to work correspondingly so as to perform short circuit control on a winding of the brushless direct current motor, and further controlling the voltage of the direct current bus to fall to a third preset voltage;
the second preset voltage is greater than a third preset voltage, the third preset voltage is greater than the working voltage, and the working voltage is greater than the first preset voltage;
the control inverter bridge works correspondingly to perform periodic short circuit and open circuit control on the winding of the brushless direct current motor, and further the step of controlling the voltage rise of the direct current bus specifically comprises the following steps:
controlling an upper bridge arm switch of the inverter bridge to be turned off, and periodically short-circuiting and opening a lower bridge arm switch at a preset duty ratio;
or, the upper and lower bridge arm switches of the inverter bridge are controlled to be periodically short-circuited and opened at a preset duty ratio alternately in a preset time period respectively.
2. The method for protecting against loss of power to a motor drive of claim 1 wherein said inverter bridges are shorted and opened for a period of 20us to 200 us.
3. The method for protecting a motor driver from a loss of power supply of claim 2, wherein the duty cycle of the short circuit time is 0.5% to 99%.
4. A motor driver is provided with a first control mode for controlling a brushless direct current motor to work in a field weakening speed regulation state, and is characterized by comprising a power input port, a bus capacitor, an inverter bridge and a control circuit, wherein the power input port is connected with the bus capacitor through a direct current bus, the bus capacitor, the inverter bridge and the brushless direct current motor are sequentially connected, a power supply end of the control circuit is connected with the direct current bus, and a control end of the control circuit is connected with a controlled end of the inverter bridge; and
the voltage acquisition circuit is used for acquiring the voltage of the direct current bus;
a control circuit comprising a processor, a memory and a motor drive power loss protection program stored in said memory, said control circuit implementing the steps of the motor drive power loss protection method of any one of claims 1-3 when said motor drive power loss protection program is executed by said processor.
5. The motor driver of claim 4, wherein the processor comprises a main controller and a gate driver, a signal terminal of the main controller is connected with a signal terminal of the voltage acquisition circuit and a signal terminal of the gate driver, respectively, and a power supply terminal of the main controller is connected with the DC bus;
the main controller is used for outputting a corresponding control signal to the grid driver according to the voltage signal of the direct current bus acquired by the voltage acquisition circuit;
and the grid driver is used for correspondingly outputting a bridge arm switch control signal to the inverter bridge according to the control signal output by the main controller.
6. The motor driver of claim 5, wherein the processor further comprises a regulator circuit, a power input of the regulator circuit being connected to the DC bus, a power output of the regulator circuit being connected to a power supply terminal of the master controller;
the voltage stabilizing circuit is used for performing voltage conversion and voltage stabilization on the voltage of the direct current bus and outputting a first working voltage to the main controller.
7. The motor drive of claim 6 wherein said gate driver and said inverter bridge are integrally disposed.
8. The motor driver according to claim 4, further comprising a rectifying circuit, wherein a power input terminal of the rectifying circuit inputs an alternating current, and a power output terminal of the rectifying circuit is connected to the power input terminal;
the rectifying circuit is used for rectifying the alternating current and outputting a direct current power supply to the direct current bus.
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CN113346804B (en) * | 2020-03-02 | 2023-06-13 | 广东威灵电机制造有限公司 | Motor control method, motor control device, motor system, and storage medium |
CN112953312B (en) * | 2021-04-21 | 2023-06-27 | 佛山市威灵洗涤电机制造有限公司 | Motor-equipped device and method and device for improving shutdown tail sound of motor-equipped device |
CN114337470B (en) * | 2022-01-04 | 2024-01-30 | 大陆汽车研发(重庆)有限公司 | Motor reversal protection device, protection method thereof and motor driving system |
CN114526256A (en) * | 2022-03-30 | 2022-05-24 | 广东美的暖通设备有限公司 | Control method and control device of magnetic suspension compressor system and storage medium |
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