CN219322071U - Motor abnormality detection control circuit and electronic device - Google Patents

Abstract

The application relates to the technical field of circuits, in particular to a motor abnormality detection control circuit and electronic equipment, wherein the motor abnormality detection control circuit comprises an abnormality detection circuit and a brake circuit; the abnormality detection circuit is used for being connected with the input/output interface of the main controller, the first power supply, the second power supply and the third power supply respectively and being connected with the brake circuit, and stopping outputting a starting signal to the brake circuit when detecting that at least one of the main controller, the first power supply, the second power supply and the third power supply is abnormal; and the brake circuit is connected with the motor and is used for prohibiting the motor from running when the starting signal is not received. According to the motor driving circuit, the working states of the power supplies and the main controller are detected, so that the motor can be timely controlled to stop working when any one of the power supplies or the main controller is abnormal, and the safety and reliability of the motor are improved.

Description

Motor abnormality detection control circuit and electronic device

Technical Field

The application relates to the technical field of circuits, in particular to a motor abnormality detection control circuit and electronic equipment.

Background

In many electronic devices, it is necessary to control the motor to run at a high speed, so it is important to control the motor to stop running in time when the motor is abnormal. Currently, motor control algorithms are typically used to pre-control the motor. The operation processing speed of the motor control algorithm has certain delay, and when the motor is abnormal in practical application, the electronic equipment cannot effectively brake the motor immediately, so that unavoidable dangers are easy to occur.

Disclosure of Invention

The application provides a motor anomaly detection control circuit and electronic equipment, through detecting the operating condition of a plurality of power supplies and main control unit, can be when any power supply or main control unit appear unusual, in time control motor stop work has improved the security and the reliability of motor.

In a first aspect, the present application provides a motor abnormality detection control circuit for performing abnormality monitoring control on a motor, where the motor is driven and controlled by a main controller; the motor abnormality detection control circuit comprises an abnormality detection circuit and a brake circuit; the abnormality detection circuit is used for being respectively connected with an input/output interface, a first power supply, a second power supply and a third power supply of the main controller and the brake circuit, and stopping outputting a starting signal to the brake circuit when at least one of the main controller, the first power supply, the second power supply and the third power supply is detected to be abnormal; the first power supply is used for supplying power to the brake circuit, the second power supply is used for supplying power to the motor, and the third power supply is used for supplying power to the main controller; and the brake circuit is connected with the motor and is used for prohibiting the motor from running when the starting signal is not received.

In some embodiments, the abnormality detection circuit includes a switch module and an abnormality detection module, the switch module is connected between the first power supply and a power supply end of the brake circuit, and the switch module is used for switching on or switching off the connection between the power supply end of the brake circuit and the first power supply; the abnormality detection module comprises a plurality of detection units, detection ends of the detection units are respectively and correspondingly connected with an input/output interface of the main controller, the second power supply and the third power supply, output ends of the detection units are connected with a control end of the switch module, and the abnormality detection module is used for outputting a control signal to the switch module when detecting that at least one of the main controller, the second power supply and the third power supply is abnormal; the switch module is used for cutting off the connection between the power supply end of the brake circuit and the first power supply according to the control signal so as to stop outputting the power supply signal to the brake circuit, and cutting off the connection between the power supply end of the brake circuit and the first power supply when the first power supply is detected to be abnormal.

In some embodiments, the switch module includes a first switch unit connected between the first power supply and a power supply end of the brake circuit, and a second switch unit connected between an output end of the abnormality detection module and a control end of the first switch unit; the second switch unit is used for outputting a turn-off signal to the first switch unit when receiving the control signal; the first switch unit is used for cutting off the connection between the power supply end of the brake circuit and the first power supply according to the turn-off signal, and cutting off the connection between the power supply end of the brake circuit and the first power supply when the first power supply is abnormal.

In some embodiments, the first switching unit includes a first switching tube, a first filter capacitor and a first resistor, the second switching unit includes a second switching tube and a second resistor, a first end of the first switching tube is connected with the first power supply, a second end of the first switching tube is connected with a power supply end of the brake circuit, the first filter capacitor and the first resistor are respectively connected with a first end and a control end of the first switching tube, a control end of the first switching tube is further connected with a first end of the second switching tube through the second resistor, a control end of the second switching tube is connected with an output end of the abnormality detection module, and a second end of the second switching tube is grounded.

In some embodiments, the abnormality detection module includes a first detection unit, a second detection unit, and a third detection unit, where the first detection unit is connected to an input-output interface of the main controller, the second detection unit is connected to the second power supply, and the third detection unit is connected to the third power supply; the first detection unit is used for outputting the control signal to the switch module when detecting that the main controller is abnormal; the second detection unit is used for outputting the control signal to the switch module when detecting that the second power supply is abnormal; the third detection unit is used for outputting the control signal to the switch module when detecting that the third power supply is abnormal.

In some embodiments, the first detection unit includes a third switch tube, a third resistor and a fourth resistor, a control end of the third switch tube is connected with the input/output interface of the main controller through the third resistor, and a control end of the third switch tube is connected with the third power supply through the third resistor and the fourth resistor; the first end of the third switching tube is connected with the control end of the switching module, and the second end of the third switching tube is grounded.

In some embodiments, the second detection unit includes a fifth resistor and a sixth resistor, a first end of the fifth resistor is connected to the second power supply, a second end of the fifth resistor is connected to the control end of the switch module, a first end of the sixth resistor is connected to the second end of the fifth resistor, and a second end of the sixth resistor is grounded.

In some embodiments, the third detection unit includes a fourth switching tube, a fifth switching tube, a seventh resistor and an eighth resistor, a control end of the fourth switching tube is connected with the third power supply through the seventh resistor, a first end of the fourth switching tube is connected with the first power supply through the eighth resistor, a second end of the fourth switching tube is grounded, a control end of the fifth switching tube is connected with the first end of the fourth switching tube, a first end of the fifth switching tube is connected with the switch module, and a second end of the fifth switching tube is grounded.

In some embodiments, the braking circuit comprises a first control unit and a second control unit, wherein the power supply end of the first control unit is connected with the abnormality detection circuit, the first normal open end of the first control unit is connected with the first phase line of the motor, the second normal open end of the first control unit is connected with the second phase line of the motor, the power supply end of the second control unit is connected with the abnormality detection circuit, the first normal open end of the second control unit is connected with the first phase line of the motor, and the second normal open end of the second control unit is connected with the third phase line of the motor; the first control unit is used for controlling the connection between the first normally open end and the second normally open end of the first control unit to conduct the connection between the first phase line and the second phase line of the motor when the starting signal is not received; and the second control unit is used for controlling the connection between the first normally open end and the second normally open end of the second control unit to conduct the connection between the first phase line and the third phase line of the motor when the starting signal is not received, and stopping the operation of the motor when the first phase line, the second phase line and the third phase line of the motor are all connected.

In a second aspect, the application further provides an electronic device, which includes a motor, a main controller, and the motor abnormality detection control circuit.

The application discloses a motor abnormality detection control circuit and electronic equipment, wherein the motor abnormality detection control circuit comprises an abnormality detection circuit and a brake circuit; the abnormality detection circuit is used for being connected with the input/output interface of the main controller, the first power supply, the second power supply and the third power supply respectively and being connected with the brake circuit, and is used for stopping outputting a starting signal to the brake circuit when detecting that at least one of the main controller, the first power supply, the second power supply and the third power supply is abnormal; the brake circuit is connected with the motor and is used for prohibiting the motor from running when the starting signal is not received. The motor abnormality detection control circuit can timely control the motor to stop working when any one power supply or the main controller is abnormal by detecting the working states of the power supplies and the main controller, and improves the safety and reliability of the motor.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application;

fig. 2 is a schematic diagram of a motor abnormality detection control circuit according to an embodiment of the present application;

FIG. 3 is a schematic diagram of an anomaly detection circuit provided in an embodiment of the present application;

FIG. 4 is a schematic diagram of a switch module according to an embodiment of the present application;

FIG. 5 is a schematic diagram of an anomaly detection module according to an embodiment of the present application;

FIG. 6 is a schematic diagram of a brake circuit according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram of another motor abnormality detection control circuit according to an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The flow diagrams depicted in the figures are merely illustrative and not necessarily all of the elements and operations/steps are included or performed in the order described. For example, some operations/steps may be further divided, combined, or partially combined, so that the order of actual execution may be changed according to actual situations.

It is to be understood that the terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification 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.

It should also be understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electronic device 10 according to an embodiment of the present disclosure. As shown in fig. 1, the electronic apparatus 10 includes a motor abnormality detection control circuit 20, a motor 30, and a main controller 40. The motor abnormality detection control circuit 20 is configured to perform abnormality monitoring control on the motor 30, and the motor 30 is driven and controlled by the main controller 40.

For example, the main controller 40 may be a micro control unit MCU for driving control of the motor 30. For example, the main controller 40 may output a driving signal for instructing the motor 30 to operate through the input-output interface.

It will be appreciated that the electronic device 10 further includes a motor driving circuit and a working mechanism (not shown), where the motor driving circuit is configured to provide a driving voltage to the driving motor to drive the motor to operate, and the motor drives the working mechanism to perform a working task when operating.

It will be appreciated that the motor drive circuit may be formed using different drive chips or drive circuits depending on the type of motor, and the specific configuration of the motor drive circuit is not limited in this application.

It will be appreciated that the specific configuration of the work mechanism may be set according to the work environment and the type of work of the electronic device 10, which is not limited in this application.

In some embodiments, the electronic device 10 may be a mower or a fallen leaf collection device, the work mechanism may be a cutterhead or a fallen leaf collection roller brush, and the motor 30 may be a brushless DC motor.

Referring to fig. 2, fig. 2 is a schematic diagram of a motor abnormality detection control circuit 20 according to an embodiment of the present application. As shown in fig. 2, the motor abnormality detection control circuit 20 includes an abnormality detection circuit 210 and a brake circuit 220. The abnormality detection circuit 210 is configured to be connected to the input/output interface of the main controller 40, the first power supply 50, the second power supply 60, and the third power supply 70, and to be connected to the brake circuit 220, and configured to stop outputting the start signal to the brake circuit 220 when abnormality of at least one of the main controller 40, the first power supply 50, the second power supply 60, and the third power supply 70 is detected. The brake circuit 220 is connected to the motor 30, and is configured to prohibit the motor 30 from running when the start signal is not received.

The first power supply 50 is used for supplying power to the brake circuit 220, the second power supply 60 is used for supplying power to the motor 30, and the third power supply 70 is used for supplying power to the main controller 40. For simplicity of the drawing, the connection relationship between the first power supply 50 and the brake circuit 220, the connection relationship between the second power supply 60 and the motor 30, and the connection relationship between the third power supply 70 and the main controller 40 are not shown in fig. 2.

In the embodiment of the present application, when the main controller 40, the first power supply 50, the second power supply 60, and the third power supply 70 are all normal, the abnormality detection circuit 210 continuously outputs the start signal to the brake circuit 220, and the brake circuit 220 does not prohibit the motor 30 from running when receiving the start signal. When at least one of the main controller 40, the first power supply 50, the second power supply 60, and the third power supply 70 is abnormal, the abnormality detection circuit 210 stops outputting the start signal to the brake circuit 220, and the brake circuit 220 prohibits the motor 30 from operating when the start signal is not received.

It will be appreciated that the braking circuit 220 may disable the motor 30 by shutting off the circuit between the motor 30 and the drive voltage. Illustratively, the brake circuit 220 is deactivated upon receipt of the activation signal, at which point the motor 30 may be driven by a motor drive circuit or drive chip. The brake circuit 220 operates when receiving the start signal, and does not allow the motor 30 to receive the driving voltage of the motor driving circuit or the driving chip, and at this time, the motor 30 cannot operate.

By detecting the operating states of the plurality of power supplies and the main controller 40 by the abnormality detection circuit 210, the motor operation is inhibited or not inhibited by the brake circuit 220, and the motor 30 can be controlled to stop operating in time when any one of the power supplies or the main controller 40 is abnormal, thereby improving the safety and reliability of the motor 30.

Referring to fig. 3, fig. 3 is a schematic diagram of an anomaly detection circuit 210 according to an embodiment of the present application. As shown in fig. 3, the abnormality detection circuit 210 includes a switch module 211 and an abnormality detection module 212, the switch module 211 is connected between the first power supply 50 and the power supply end of the brake circuit 220, and the switch module 211 is used for switching on or switching off the connection between the power supply end of the brake circuit 220 and the first power supply 50.

For example, as shown in fig. 3, the abnormality detection module 212 may include a plurality of detection units, detection ends of the plurality of detection units are respectively and correspondingly connected to the input/output interface of the main controller 40, the second power supply 60, and the third power supply 70, output ends of the plurality of detection units are connected to control ends of the switch module 211, and the abnormality detection module 212 is configured to output a control signal to the switch module 211 when detecting that at least one of the main controller 40, the second power supply 60, and the third power supply 70 is abnormal.

For example, the abnormality detection module 212 outputs a control signal to the switching module 211 when detecting an abnormality of the main controller 40. For another example, the abnormality detection module 212 outputs a control signal to the switching module 211 when detecting an abnormality of the second power supply 60.

The control signal may be a signal opposite to the start signal. For example, the enable signal is a high level signal and the control signal is a low level signal.

Illustratively, as shown in fig. 3, the switch module 211 is configured to disconnect the power supply terminal of the brake circuit 220 from the first power supply 50 according to the control signal, to stop outputting the power supply signal to the brake circuit 220, and to disconnect the power supply terminal of the brake circuit 220 from the first power supply 50 when an abnormality of the first power supply 50 is detected. When the connection between the brake circuit 220 and the first power supply 50 is cut off, the brake circuit 220 cannot receive the start signal, and at this time, the brake circuit 220 will prohibit the motor 30 from running.

By arranging the switch module 211 and the abnormality detection module 212, when the abnormality detection module 212 detects that at least one of the main controller 40, the second power supply 60 and the third power supply 70 is abnormal, a control signal is output to the switch module 211, and the switch module 211 cuts off the connection between the power supply end of the brake circuit 220 and the first power supply 50 according to the control signal, so that the brake circuit 220 cannot receive the start signal, and the motor 30 is controlled to stop working in time, thereby improving the safety and reliability of the motor 30. In addition, when the switch module 211 detects that the first power supply 50 is abnormal, the connection between the power supply end of the brake circuit 220 and the first power supply 50 is cut off, and the motor 30 can be controlled to stop working in time, so that the safety and reliability of the motor 30 are improved.

Referring to fig. 4, fig. 4 is a schematic diagram of a switch module 211 according to an embodiment of the disclosure. As shown in fig. 4, the switching module 211 includes a first switching unit 2111 and a second switching unit 2112, the first switching unit 2111 is connected between the first power supply 50 and the power supply terminal of the brake circuit 220, and the second switching unit 2112 is connected between the output terminal of the abnormality detection module 212 and the control terminal of the first switching unit 2111.

Wherein, the second switching unit 2112 is configured to output an off signal to the first switching unit 2111 when receiving the control signal; the first switching unit 2111 is configured to cut off connection between the power supply end of the brake circuit 220 and the first power supply 50 according to the off signal, and to cut off connection between the power supply end of the brake circuit 220 and the first power supply 50 when abnormality of the first power supply 50 is detected.

In some embodiments, the second switching unit 2112 outputs a turn-off signal to the first switching unit 2111 when receiving the control signal, so that the first switching unit 2111 cuts off the connection of the power supply terminal of the brake circuit 220 and the first power supply 50 according to the turn-off signal. When the second switching unit 2112 does not receive the control signal, a turn-on signal is output to the first switching unit 2111, so that the first switching unit 2111 turns on the connection of the power supply terminal of the brake circuit 220 and the first power supply 50 according to the turn-on signal.

In the above embodiment, by providing the first switching unit 2111 and the second switching unit 2112, the off signal can be output to the first switching unit 2111 through the second switching unit 2112 upon receiving the control signal; the first switch unit 2111 cuts off the connection between the power supply end of the brake circuit 220 and the first power supply 50 according to the turn-off signal, so that the motor 30 can be controlled to stop working in time, and the safety and reliability of the motor 30 are improved.

In some embodiments, the first switching unit 2111 may disconnect the power supply end of the brake circuit 220 from the first power supply 50 when the first power supply 50 is detected to be abnormal, for example, when the first power supply 50 has no power supply voltage output.

In the above embodiment, when the first switching unit 2111 detects that the first power supply 50 is abnormal, the connection between the power supply end of the brake circuit 220 and the first power supply 50 is cut off, so that the motor 30 can be controlled to stop working in time, and the safety and reliability of the motor 30 are improved.

As shown in fig. 4, the first switching unit 2111 may include a first switching tube Q1, a first filter capacitor C1, and a first resistor R1, and the second switching unit 2112 includes a second switching tube Q2 and a second resistor R2. The first end of the first switching tube Q1 is connected with the first power supply 50, the second end of the first switching tube Q1 is connected with the power supply end of the brake circuit 220, the first filter capacitor C1 and the first resistor R1 are respectively connected with the first end and the control end of the first switching tube Q1, the control end of the first switching tube Q1 is also connected with the first end of the second switching tube Q2 through the second resistor R2, the control end of the second switching tube Q2 is connected with the output end, and the second end of the second switching tube Q2 is grounded.

The first filter capacitor C1 is configured to filter a signal of the first switching tube Q1, and the first resistor R1 is a bias resistor of the first switching tube Q1 and is configured to provide a bias voltage for the first switching tube Q1. The second resistor R2 is used for limiting the magnitude of the current flowing through the first end of the second switching tube Q2.

In this embodiment, the first switch Q1 may be a P-type MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) transistor, or may be a P-type transistor. The second switching tube Q2 may be an N-type triode, an N-type MOS tube, or the like.

In some embodiments, please refer to fig. 3 and 4. When the main controller 40, the second power supply 60, the third power supply 70, and the first power supply 50 are all normal, the abnormality detection module 212 detects that the main controller 40, the second power supply 60, and the third power supply 70 are all normal, and outputs a high-level control signal to the control end of the second switching tube Q2, at this time, the second switching tube Q2 is turned on, and the control end of the first switching tube Q1 is grounded through the second switching tube Q2. The first power supply 50 is in a normal state, and outputs a high level to the first end of the first switching tube Q1, at this time, the voltage Vgs of the gate electrode of the first switching tube Q1 relative to the source electrode meets a conducting condition, the first switching tube Q1 is conducted, the brake circuit 220 is connected with the first power supply 50, and receives a start signal, so that the normal operation of the motor 50 is not forbidden.

Conversely, when at least one of the main controller 40, the second power supply 60 and the third power supply 70 is abnormal, the abnormality detection module 212 outputs a control signal of low level to the second switching transistor Q2, and the second switching transistor Q2 is turned off. At this time, the first power supply 50 is in a normal state, and outputs a high level to the first end and the control end of the first switching tube Q1, the voltage Vgs of the gate electrode of the first switching tube Q1 relative to the source electrode does not satisfy the on condition, the first switching tube Q1 is turned off, the power supply end of the brake circuit 220 is disconnected from the first power supply 50, the brake circuit 220 does not receive a start signal, and the operation of the motor 50 is disabled.

In other embodiments, when the first power supply 50 is abnormal, for example, when the first power supply 50 has no operating voltage output, and at this time, the first end of the first switching tube Q1 has no voltage, the first switching tube Q1 is necessarily turned off, so that the connection between the power supply end of the brake circuit 220 and the first power supply 50 may be cut off. Therefore, the switch module 211 can realize independent detection of the first power supply 50, and control the brake circuit 200 to prohibit the motor 50 from running when the first power supply 50 is abnormal.

It will be appreciated that when the power supplied by the brake circuit 220 is normal, the brake circuit 220 does not disable the motor 50, the motor 50 can be powered normally, and the motor is not "braked". When the brake circuit 220 is not powered, the brake circuit 200 disables the motor 50 and the motor "brakes". Therefore, when the brake circuit 200 can normally supply power, this corresponds to receiving the start signal, and when the brake circuit 220 does not supply power, this corresponds to not receiving the start signal.

Referring to fig. 5, fig. 5 is a schematic diagram of an anomaly detection module 212 according to an embodiment of the present application. As shown in fig. 5, the abnormality detection module 212 includes a first detection unit 2121, a second detection unit 2122, and a third detection unit 2123. The first detection unit 2121 is connected to the input/output interface of the main controller 40, the second detection unit 2122 is connected to the second power supply 60, and the third detection unit 2123 is connected to the third power supply 70.

The first detection unit 2121 is configured to output a control signal to the switch module 211 when detecting that the main controller 40 is abnormal. The second detection unit 2122 is configured to output a control signal to the switch module 211 when detecting that the second power supply 60 is abnormal. The third detection unit 2123 is configured to output a control signal to the switch module 211 when detecting that the third power supply 70 is abnormal.

The first detection unit 2121 outputs a control signal to the switching module when detecting that the input/output interface (General Purpose Input Output, GPIO interface) of the main controller 40 is in a floating state. In the normal case, the input/output interface of the main controller 40 outputs a low level signal or a high level signal as needed. When the input/output interface of the main controller 40 is damaged due to static electricity or the like, a floating state occurs. The floating state refers to that the input/output interface of the main controller 40 outputs neither a high level signal nor a low level signal.

The second detection unit 2122 outputs a control signal to the switching module 211 when detecting that the second power supply 60 is abnormal, for example, the second power supply 60 has no operating voltage output. It should be noted that, when the second power supply 60 is used for supplying power to the motor 30, a control signal needs to be output to the switch module 211 when the second power supply 60 is abnormal, so that the switch module 211 stops outputting the power supply signal to the brake circuit 220 according to the control signal, and further the power failure motor 30 can be braked, thereby avoiding danger.

The third detection unit 2123 outputs a control signal to the switching module 211 when detecting that the third power supply 70 is abnormal, for example, the third power supply 70 has no operating voltage output. It should be noted that, since the third power supply 70 is used for supplying power to the main controller 40, the main controller 40 is used for driving and controlling the motor 30, when the third power supply 70 is abnormal, a control signal needs to be output to the switch module 211, so that the switch module 211 stops outputting the power supply signal to the brake circuit 220 according to the control signal, and further, the power failure machine 30 can be braked, and the motor 30 is prevented from being out of control.

By providing the first detection unit 2121, the second detection unit 2122, and the third detection unit 2123, when any one of the main controller 40, the second power supply 60, and the third power supply 70 is detected to be abnormal, the motor 30 can be controlled to stop working in time, and the safety and reliability of the motor 30 are improved.

As shown in fig. 5, the first detection unit 2121 may include a third switching tube Q3, a third resistor R3, and a fourth resistor R4. The control end of the third switching tube Q3 is connected with the input/output interface of the main controller 40 through a third resistor R3, and the control end of the third switching tube Q3 is connected with a third power supply 70 through the third resistor R3 and a fourth resistor R4; the first end of the third switching tube Q3 is connected to the control end of the switching module 211, and the second end of the third switching tube Q3 is grounded.

Wherein, the third switching tube Q3 remains turned on to output a control signal to the switching module 211 when detecting that the output of the input-output interface of the main controller 40 is abnormal and the third power supply 70 outputs an operating voltage. The third resistor R3 is used for limiting the magnitude of the current flowing through the control end of the third switching tube Q3; the fourth resistor R4 is used for dividing the operating voltage output by the third power supply 70.

The third switching transistor Q3 may be an N-type transistor, but may be any other switching transistor. When the third switching tube Q3 detects that the input/output interface of the main controller 40 is in a floating state and the third power supply 70 outputs the operating voltage, the third switching tube Q3 is turned on, and outputs a low-level control signal to the switching module 211.

As shown in fig. 5, the second detection unit 2122 may include a fifth resistor R5 and a sixth resistor R6, a first end of the fifth resistor R5 is connected to the second power supply 60, a second end of the fifth resistor R5 is connected to the control end of the switch module 211, a first end of the sixth resistor R6 is connected to the second end of the fifth resistor R5, and a second end of the sixth resistor R6 is grounded. The fifth resistor R5 is used for dividing the working voltage output by the second power supply 60.

It should be noted that, since the second power supply 60 is used to supply power to the motor 30, a larger voltage is required, and thus, when the second power supply 60 normally outputs an operating voltage, the operating voltage is generally much greater than the on voltage of the switch module 211. In order to avoid damaging the switching module 211, it is necessary to divide the operating voltage output from the second power supply 60.

In the embodiment of the present application, the sixth resistor R6 is used to ground the control terminal of the switch module 211 to output the control signal to the switch module 211 when the abnormality of the second power supply 60 is detected. When the second power supply 60 does not output the operating voltage, the first end of the sixth resistor R6 corresponds to the ground, that is, the control end of the switch module 211 is grounded, so that the sixth resistor R6 may output the low-level control signal to the switch module 211.

As shown in fig. 5, the third detection unit 2123 may include a fourth switching tube Q4, a fifth switching tube Q5, a seventh resistor R7, and an eighth resistor R8, where a control end of the fourth switching tube Q4 is connected to the third power supply 70 through the seventh resistor R7, a first end of the fourth switching tube Q4 is connected to the first power supply 50 through the eighth resistor R8, and a second end of the fourth switching tube Q4 is grounded. The control end of the fifth switching tube Q5 is connected to the first end of the fourth switching tube Q4, the first end of the fifth switching tube Q5 is connected to the switching module 211, and the second end of the fifth switching tube Q5 is grounded.

The fourth switching tube Q4 is configured to control the fifth switching tube Q5 to output a control signal to the switching module 211 according to the operating voltage output by the first power supply 50 when the abnormality of the third power supply 70 is detected. The seventh resistor R7 is used for limiting the magnitude of the current flowing through the control terminal of the fourth switching tube Q4, and the eighth resistor R8 is used for limiting the magnitude of the current flowing through the control terminal of the fifth switching tube Q5.

For example, as shown in fig. 5, the fourth switching tube Q4 and the fifth switching tube Q5 may be N-type transistors, or may be other types of switching tubes. The fourth switching tube Q4 is turned off when detecting that the third power supply 70 has no operating voltage output; the fifth switching tube Q5 is turned on according to the operation voltage outputted from the first power supply 50, and at this time, since the first end and the second end of the fifth switching tube Q5 are turned on to be grounded, the fifth switching tube Q5 outputs a low-level control signal to the switching module 211.

Referring to fig. 6, fig. 6 is a schematic diagram of a brake circuit 220 according to an embodiment of the present application. As shown in fig. 6, the brake circuit 220 may include a first control unit 221 and a second control unit 222, wherein a power supply end of the first control unit 221 is connected to the abnormality detection circuit 210, a first normal end of the first control unit 221 is connected to a first phase line of the motor 30, a second normal end of the first control unit 221 is connected to a second phase line of the motor 30, a power supply end of the second control unit 222 is connected to the abnormality detection circuit 210, a first normal end of the second control unit 222 is connected to the first phase line of the motor 30, and a second normal end of the second control unit 222 is connected to a third phase line of the motor 30.

The first control unit 221 is configured to control, when the start signal is not received, the first normally open end and the second normally open end of the first control unit 221 to be connected to conduct connection between the first phase line and the second phase line of the motor 30. The second control unit 222 is configured to control, when the start signal is not received, the first open end and the second open end of the second control unit 222 to connect to conduct the connection between the first phase line and the third phase line of the motor 30. When the first phase line, the second phase line and the third phase line of the motor 30 are all connected, the motor 30 stops running.

When the first phase line, the second phase line, and the third phase line of the motor 30 are all connected, the motor 30 is shorted. Illustratively, the first phase may be a W-phase, the second phase may be a V-phase, and the third phase may be a U-phase.

As shown in fig. 6, the first control unit 221 may include a first relay U1, a ninth resistor R9, a first diode D1, and a second filter capacitor C2. The first control end of the first relay U1 is connected to the abnormality detection circuit 210 through a ninth resistor R9, and the first diode D1 and the second filter capacitor C2 are respectively connected to the first control end and the second control end of the first relay U1, where the second control end is grounded. The first open end of the first relay U1 is connected to a first phase line of the motor 30, and the second open end of the first relay U1 is connected to a second phase line of the motor 30.

The first diode D1 may be a schottky diode, and is configured to freewheel the first relay U1 when the first relay U1 is turned off, due to an inductor current generated by a coil between the first control terminal and the second control terminal. The ninth resistor R9 is used for limiting the current flowing through the first relay U1, and the second filter capacitor C2 is used for filtering signals of the first relay U1.

In some embodiments, the first relay U1 is configured to turn on the first control terminal and the second control terminal when the start signal is not received, so that the first normally open terminal and the second normally open terminal are closed.

Illustratively, as shown in fig. 6, the first control terminal of the first relay U1 is pin 1, the second control terminal is pin 2, the first normal-open terminal is pin 4, and the second normal-open terminal is pin 6. When the start signal is not received, the first normally open end and the second normally open end in the first relay U1 are closed. When receiving the start signal, the first normally open end and the second normally open end in the first relay U1 are disconnected.

As shown in fig. 6, the second control unit 222 may include a second relay U2, a tenth resistor R10, a second diode D2, and a third filter capacitor C3. The first control end of the second relay U2 is connected to the abnormality detection circuit 210 through a tenth resistor R10, and the second diode D2 and the third filter capacitor C3 are respectively connected to the first control end and the second control end of the second relay U2, where the second control end is grounded. The first open end of the second relay U2 is connected to the first phase line of the motor 30 and the second open end of the second relay U2 is connected to the second phase line of the motor 30.

The second diode D2 may be a schottky diode, and is configured to generate an inductor current after the first control terminal and the second control terminal of the second relay U2 are turned on, so as to freewheel the second relay U2. The tenth resistor R10 is used for limiting the magnitude of the current flowing through the second relay U2, and the third filter capacitor C3 is used for filtering the signal of the second relay U2. The working principle of the second relay U2 is the same as that of the first relay U1, and will not be described here.

In some embodiments, the second relay U2 is configured to turn on the first control terminal and the second control terminal when the start signal is not received, so that the first normally open terminal and the second normally open terminal are closed.

Through setting up first relay U1 and second relay U2, can be when not receiving the start signal, through the connection between first phase line and the second phase line and the connection between first phase line and the third phase line that first relay U1 and second relay U2 switched on motor 30, make the three-phase power supply end short circuit of motor, at this moment, even if motor drive circuit provides driving voltage for the motor, motor 30 also can not normally operate, so, can realize controlling motor 30 and stop running.

Referring to fig. 7, fig. 7 is a schematic diagram of another motor abnormality detection control circuit 20 according to an embodiment of the present application. As shown in fig. 7, VCC1 is a first power supply 50, VCC2 is a second power supply 60, VCC3 is a first power supply 70, VCC1, VCC2, and VCC3 may be generated by other voltage conversion circuits within the electronic device 10 for powering other circuits. Illustratively, VCC1 powers brake circuit 220, VCC2 powers motor 30, and VCC3 powers master controller 40. nrelay_en represents an output signal of the GPIO interface of the main controller 40, and when the GPIO interface of the main controller 40 is abnormal, the nrelay_en signal is abnormal, typically in a floating state. The motor 30 operates normally when the emfw_in, emfv_in and emfu_in are connected to the three-phase electrical input, respectively, and the motor 30 cannot operate if the emfw_in, emfv_in and emfu_in are shorted. The abnormality detection module 212 performs abnormality detection, for example, the first detection unit 2121 outputs a control signal to the switching module 211 when detecting an abnormality of the main controller 40; for another example, the second detection unit 2122 outputs a control signal to the switch module 211 when detecting that the second power supply 60 is abnormal; for another example, the third detection unit 2123 outputs a control signal to the switching module 211 when detecting that the third power supply 70 is abnormal. Upon receiving the control signal, the second switching unit 2112 outputs a turn-off signal to the first switching unit 2111, so that the first switching unit 2111 cuts off the connection between the power supply terminal of the brake circuit 220 and the first power supply 50 according to the turn-off signal, to stop outputting the start signal to the brake circuit 220. The first control unit 221 in the brake circuit 220 is configured to control the first normally open end and the second normally open end of the first control unit 221 to be connected to conduct the connection between the first phase line and the second phase line of the motor 30 when the start signal is not received. The second control unit 222 in the brake circuit 220 is configured to control the first normally open end and the second normally open end of the second control unit 222 to be connected to conduct the connection between the first phase line and the third phase line of the motor 30 when the start signal is not received. So that the motor 30 can be stopped.

As shown in fig. 7, a filter circuit 230 is connected between the abnormality detection circuit 210 and the brake circuit 220, wherein the filter circuit 230 may include at least one filter capacitor, for example, a filter capacitor C4 and a filter capacitor C5. The filter circuit 230 is used to filter the signal output from the abnormality detection circuit 210 to the brake circuit 220.

In fig. 7, the connection relationships among the circuits, the modules and the units are shown in the detailed description of the above embodiments, and are not repeated here.

The motor abnormality detection control circuit 20 provided in the above embodiment is applied to an electronic device, and the motor abnormality detection control circuit 20 includes an abnormality detection circuit 21 and a brake circuit 220. The abnormality detection circuit 21 is configured to be connected to the input/output interface of the main controller 40, the first power supply 50, the second power supply 60, and the third power supply 70, and to be connected to the brake circuit 220, and configured to stop outputting the start signal to the brake circuit 220 when abnormality of at least one of the main controller 40, the first power supply 50, the second power supply 60, and the third power supply 70 is detected. The brake circuit 220 is connected to the motor 30 for disabling the motor 30 when the start signal is not received. The motor abnormality detection control circuit 20 in the application can timely control the motor 30 to stop working when any one power supply or the main controller 40 is abnormal by detecting the working states of the power supplies and the main controller 40, so that the safety and the reliability of the motor 30 are improved.

While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. The motor abnormality detection control circuit is characterized by being used for carrying out abnormality monitoring control on a motor, and the motor is driven and controlled by a main controller; the motor abnormality detection control circuit comprises an abnormality detection circuit and a brake circuit;

the abnormality detection circuit is used for being respectively connected with an input/output interface, a first power supply, a second power supply and a third power supply of the main controller and the brake circuit, and stopping outputting a starting signal to the brake circuit when at least one of the main controller, the first power supply, the second power supply and the third power supply is detected to be abnormal; the first power supply is used for supplying power to the brake circuit, the second power supply is used for supplying power to the motor, and the third power supply is used for supplying power to the main controller;

And the brake circuit is connected with the motor and is used for prohibiting the motor from running when the starting signal is not received.

2. The motor abnormality detection control circuit according to claim 1, characterized in that the abnormality detection circuit includes a switch module and an abnormality detection module, the switch module being connected between the first power supply and a power supply end of the brake circuit, the switch module being configured to turn on or off connection of the power supply end of the brake circuit and the first power supply;

the abnormality detection module comprises a plurality of detection units, detection ends of the detection units are respectively and correspondingly connected with an input/output interface of the main controller, the second power supply and the third power supply, output ends of the detection units are connected with a control end of the switch module, and the abnormality detection module is used for outputting a control signal to the switch module when detecting that at least one of the main controller, the second power supply and the third power supply is abnormal;

the switch module is used for cutting off the connection between the power supply end of the brake circuit and the first power supply according to the control signal so as to stop outputting the power supply signal to the brake circuit, and cutting off the connection between the power supply end of the brake circuit and the first power supply when the first power supply is detected to be abnormal.

3. The motor abnormality detection control circuit according to claim 2, characterized in that the switch module includes a first switch unit connected between the first power supply source and a power supply end of the brake circuit, and a second switch unit connected between an output end of the abnormality detection module and a control end of the first switch unit;

the second switch unit is used for outputting a turn-off signal to the first switch unit when receiving the control signal;

the first switch unit is used for cutting off the connection between the power supply end of the brake circuit and the first power supply according to the turn-off signal, and cutting off the connection between the power supply end of the brake circuit and the first power supply when the first power supply is abnormal.

4. The motor abnormality detection control circuit according to claim 3, wherein the first switching unit includes a first switching tube, a first filter capacitor and a first resistor, the second switching unit includes a second switching tube and a second resistor, a first end of the first switching tube is connected to the first power supply, a second end of the first switching tube is connected to a power supply end of the brake circuit, the first filter capacitor and the first resistor are respectively connected to a first end and a control end of the first switching tube, a control end of the first switching tube is further connected to a first end of the second switching tube through the second resistor, a control end of the second switching tube is connected to an output end of the abnormality detection module, and a second end of the second switching tube is grounded.

5. The motor abnormality detection control circuit according to claim 2, characterized in that the abnormality detection module includes a first detection unit, a second detection unit, and a third detection unit, the first detection unit being connected to an input-output interface of the main controller, the second detection unit being connected to the second power supply, the third detection unit being connected to the third power supply;

the first detection unit is used for outputting the control signal to the switch module when detecting that the main controller is abnormal;

the second detection unit is used for outputting the control signal to the switch module when detecting that the second power supply is abnormal;

the third detection unit is used for outputting the control signal to the switch module when detecting that the third power supply is abnormal.

6. The motor abnormality detection control circuit according to claim 5, wherein the first detection unit includes a third switching tube, a third resistor, and a fourth resistor, a control end of the third switching tube is connected to the input/output interface of the main controller via the third resistor, and a control end of the third switching tube is connected to the third power supply via the third resistor and the fourth resistor; the first end of the third switching tube is connected with the control end of the switching module, and the second end of the third switching tube is grounded.

7. The motor abnormality detection control circuit according to claim 5, characterized in that the second detection unit includes a fifth resistor and a sixth resistor, a first end of the fifth resistor is connected to the second power supply, a second end of the fifth resistor is connected to the control end of the switch module, a first end of the sixth resistor is connected to the second end of the fifth resistor, and a second end of the sixth resistor is grounded.

8. The motor abnormality detection control circuit according to claim 5, wherein the third detection unit includes a fourth switching tube, a fifth switching tube, a seventh resistor, and an eighth resistor, a control end of the fourth switching tube is connected to the third power supply through the seventh resistor, a first end of the fourth switching tube is connected to the first power supply through the eighth resistor, a second end of the fourth switching tube is grounded, a control end of the fifth switching tube is connected to the first end of the fourth switching tube, a first end of the fifth switching tube is connected to the switching module, and a second end of the fifth switching tube is grounded.

9. The motor abnormality detection control circuit according to claim 1, characterized in that the brake circuit includes a first control unit and a second control unit, a power supply end of the first control unit is connected to the abnormality detection circuit, a first normal open end of the first control unit is connected to a first phase line of the motor, a second normal open end of the first control unit is connected to a second phase line of the motor, a power supply end of the second control unit is connected to the abnormality detection circuit, a first normal open end of the second control unit is connected to the first phase line of the motor, and a second normal open end of the second control unit is connected to a third phase line of the motor;

The first control unit is used for controlling the connection between the first normally open end and the second normally open end of the first control unit to conduct the connection between the first phase line and the second phase line of the motor when the starting signal is not received;

and the second control unit is used for controlling the connection between the first normally open end and the second normally open end of the second control unit to conduct the connection between the first phase line and the third phase line of the motor when the starting signal is not received, and stopping the operation of the motor when the first phase line, the second phase line and the third phase line of the motor are all connected.

10. An electronic apparatus comprising a motor, a main controller, and a motor abnormality detection control circuit according to any one of claims 1 to 9.

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