Motor drive control system

Abstract

This application discloses a motor drive control system, relating to the field of home appliance technology, including: a switch power supply module, a control module, a motor drive module, and a switch module. The control module includes at least a power supply terminal, a signal connection terminal, and a signal connection status output terminal. The switch power supply module is connected to the power supply terminal of the control module, the motor drive module is connected to the signal connection terminal of the control module, the switch module is connected to the signal connection status output terminal of the control module, and the switch module is connected to the motor drive module. The switch module switches the power-on state of the motor drive module according to the level signal of the signal connection status output terminal. The beneficial effect of this application is that when either the control module or the motor drive module malfunctions, the switch module can respond to changes in the level signal and cut off the power supply to the motor drive module, ensuring the safety of equipment operation.

Description

Technical Field

[0001] This application relates to the field of home appliance technology, and in particular to motor drive control systems. Background Technology

[0002] Motors, as core power components, are widely used in home appliances. To improve work efficiency, the speed of motors is constantly increasing. While bringing high efficiency, this also brings significant safety risks.

[0003] In related technologies, the core logic for safety control of motor-driven home appliances involves capturing user intervention actions through sensors or mechanical structures and transmitting signals to the control unit, which then cuts off the power to the motor drive module. For example, in a washing machine's door control system, the device uses a mechanical interlock device (such as a door lock switch) or photoelectric sensors between the door and the cabinet to detect the opening and closing status of the washing machine door in real time. When a user attempts to open the door during the washing process, the detection device immediately triggers a signal, which the control system receives and quickly brakes the motor. However, when the control unit or motor drive chip malfunctions, the motor cannot be controlled, thus affecting the safety of the equipment.

[0004] The patent "Appliance Lock with Mechanical Door Sensor", publication number CN102498244A, publication date: June 13, 2012, specifically discloses that the motor board is powered through the door lock, and the motor board drive is disconnected as soon as the door lock is opened. However, when the door is forcibly opened, the switching power supply is cut off, and the energy stored in the large electrolytic capacitor can keep the motor running. The user may still be facing the high-speed roller, which is unsafe. Moreover, if either the main control chip or the motor chip malfunctions, the motor cannot be controlled to brake. Summary of the Invention

[0005] This application addresses the problem in existing motor drive control technologies that fail to control motor braking when the control unit or motor drive chip malfunctions. It provides a motor drive control system that connects a motor drive module to a control module, the control module to a switch module, the switch module to the motor drive module, and the motor drive module to a switch power supply module via the switch module and control module. This system enables the switch module to respond to changes in the power supply to the motor drive module in response to changes in the voltage level when either the control module or the motor drive module malfunctions, thus ensuring the safety of equipment operation.

[0006] To achieve the above technical objectives, this application provides a technical solution: a motor drive control system applied to household appliances, comprising: a switch power supply module, a control module, a motor drive module, and a switch module. The control module includes at least a power supply terminal, a signal connection terminal, and a signal connection status output terminal. The switch power supply module is connected to the power supply terminal of the control module, the motor drive module is connected to the signal connection terminal of the control module, the switch module is connected to the signal connection status output terminal of the control module, and the switch module is connected to the motor drive module. The switch module switches the power-on state of the motor drive module according to the level signal of the signal connection status output terminal.

[0007] Furthermore, it also includes a door lock module, which is connected to the feedback terminal of the control module.

[0008] Furthermore, the switching module includes at least a switching transistor, the input terminal of which is connected to the signal connection status output terminal of the control module, and the output terminal of which is connected to the motor drive module.

[0009] Furthermore, the motor drive module includes a drive chip and an intelligent power module connected to the controlled end of the motor. The drive chip is connected to the signal connection end of the control module and the signal input end of the intelligent power module, and the intelligent power module is connected to the switch module.

[0010] Furthermore, the power supply pin of the intelligent power module is connected to the output terminal of the switching module.

[0011] Furthermore, the protection pin of the intelligent power module is connected to the output terminal of the switching module.

[0012] Furthermore, the switching module includes at least a first switching circuit and a second switching circuit. The input terminal of the first switching circuit is connected to the signal connection status output terminal of the control module, and the output terminal of the first switching circuit is connected to the power supply pin of the intelligent power module. The input terminal of the second switching circuit is connected to the signal connection status output terminal of the control module, and the output terminal of the second switching circuit is connected to the protection pin of the intelligent power module.

[0013] Furthermore, the first switching circuit includes at least a first switching transistor, and the second switching circuit includes at least a second switching transistor.

[0014] Furthermore, the first switching transistor is a MOSFET, a bipolar transistor, or a combination of a MOSFET and a bipolar transistor.

[0015] Furthermore, when the communication between the driver chip and the control module is normal, the signal connection terminal of the control module outputs a high-level signal, the signal connection status output terminal of the control module outputs a high-level signal, the first switch circuit and the second switch circuit are connected, and the power supply pin and protection pin of the intelligent power module are in a high-level state; when the communication between the driver chip and the control module is abnormal, the signal connection terminal of the control module outputs a low-level signal, the signal connection status output terminal of the control module outputs a low-level signal, the first switch circuit and the second switch circuit are cut off, and the power supply pin and protection pin of the intelligent power module switch to a low-level state.

[0016] The beneficial effects of this application are: 1. By connecting the switch module to the motor drive module and the control module, when either the motor drive module or the control module fails, the switch module can respond to the level change of the signal connection status output terminal to cut off the power supply to the motor drive module, thereby ensuring the safety of the motor drive.

[0017] 2. By switching the on / off state of the switch in response to the level signal at the output terminal of the signal connection state, the input voltage of the CIN pin is changed. This causes the intelligent power module to trigger the protection mechanism and shut off the power supply to the motor when any fault occurs in the control module or the motor drive module, thereby improving the safety of motor operation.

[0018] 3. By utilizing the first and second switching circuits, dual power-off protection is achieved in the event of any abnormality in the control module or the driver chip, thereby improving the operational safety of the equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of one embodiment of the motor drive control system of this application.

[0020] Figure 2 This is a schematic diagram of another embodiment of the motor drive control system of this application. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description of this application is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely one preferred embodiment of this application and are only used to explain this application. They do not limit the scope of protection of this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] like Figure 1As shown, a motor drive control system, applied to home appliances, includes: a switch power supply module, a control module, a motor drive module, and a switch module. The control module includes at least a power supply terminal, a signal connection terminal, and a signal connection status output terminal. The switch power supply module is connected to the power supply terminal of the control module, the motor drive module is connected to the signal connection terminal of the control module, the switch module is connected to the signal connection status output terminal of the control module, and the switch module is connected to the motor drive module. The switch module switches the power-on state of the motor drive module according to the level signal of the signal connection status output terminal.

[0023] In this embodiment, a switch module is connected to both the motor drive module and the control module. This allows the switch module to cut off the power to the motor drive module in response to a level change at the signal connection status output terminal when either the motor drive module or the control module malfunctions, thus ensuring the safety of the motor drive.

[0024] It is understandable that, since the control module is connected between the power supply module and the switch module, when the control module malfunctions, the level of its signal connection status output terminal will also change. Therefore, when the control module malfunctions, the switch module can also respond to the level change and cut off the power to the motor drive module.

[0025] Specifically, the motor drive control system also includes a door lock module, which is connected to the feedback terminal of the control module.

[0026] The door lock module monitors whether the door of the home appliance is open and outputs a feedback signal to the feedback terminal of the control module. Based on the feedback signal, the control module outputs different level signals to the motor drive module via the signal connection terminal. The motor drive module then executes motor driving and braking actions based on these different level signals. The door lock module is connected to the door lock unit of the home appliance and outputs feedback signals to the control module based on the door lock's operation.

[0027] In this embodiment, the switch power supply module is not connected to the door lock module. The power supply of the switch power supply module is not affected by the door lock module. When the door of the home appliance is opened, the switch power supply module still supplies power to the control module and the switch module. The power supply of the motor drive module is not affected. Thus, the motor drive module can respond to the level signal corresponding to the door lock opening to execute motor braking, causing the structure driven by the motor to brake quickly, reducing the safety risks caused by the inertial operation when the user opens the door.

[0028] For example, in a garment processing device, a motor drives a roller to rotate. When a user places or retrieves clothes, the door of the garment processing device is opened. The door lock module outputs a first-level signal to the feedback terminal of the control module. The control module outputs a second-level signal to the motor drive module based on the first-level signal. The motor drive module then applies an emergency brake to minimize the roller speed after the user opens the door, thereby improving the safety of the equipment operation.

[0029] In this application, the control module can be a control chip, in which case the power supply terminal, signal connection terminal, signal connection status output terminal, and feedback terminal are pin ports on the control chip. The control module can also be a filter circuit and a multi-level logic circuit, in which case the power supply terminal is the input terminal of the filter circuit, the signal connection terminal includes the input terminal of the first-level logic circuit and the output terminal of the second-level logic circuit, the feedback terminal is the input terminal of the second-level logic circuit, and the signal connection status output terminal is the output terminal of the first-level logic circuit.

[0030] The switching module includes at least a switching transistor. The input terminal of the switching transistor is connected to the signal connection status output terminal of the control module, and the output terminal of the switching transistor is connected to the motor drive module. The switching transistor switches its on and off states through the input level signal, thereby changing the power supply state of the motor drive module.

[0031] Specifically, the motor drive module includes a drive chip and an intelligent power module connected to the controlled end of the motor. The drive chip is connected to the signal connection end of the control module and the signal input end of the intelligent power module, and the intelligent power module is connected to the switch module.

[0032] The intelligent power module integrates a three-phase inverter bridge composed of power devices such as IGBTs or MOSFETs, a drive circuit, overcurrent / overheat protection logic, and a signal interface. It converts DC power from lithium batteries or rectified AC mains power into three-phase AC power to drive the motor. The drive chip receives the level signal output from the signal connection terminal and uses a PWM signal to control the switching timing of the power devices inside the intelligent power module, thereby adjusting the frequency and amplitude of its output voltage to achieve motor speed modulation and emergency braking when the door lock is opened. The motor can be any type, such as a three-phase asynchronous motor or a permanent magnet synchronous motor, and is connected to the inverter output terminal of the intelligent power module via the UVW three-phase lines.

[0033] In some cases, the power supply pin VP1 of the intelligent power module is connected to the output of the switching module. In this case, if there is any abnormality in the control module or the driver chip, the switching module will be cut off in response to the level signal at the signal connection status output, the intelligent power module will be cut off from power, the motor will be de-energized, and the safety of the equipment operation will be ensured.

[0034] At this time, the switching transistor is a MOSFET.

[0035] In other cases, the protection pin CIN of the intelligent power module is connected to the output of the switching module. In this case, if there is any abnormality in the control module or the driver chip, the switching module will be cut off in response to the level signal at the signal connection state output. The intelligent power module will trigger the protection mechanism to shut off the power supply to the motor and improve the safety of motor operation.

[0036] In this situation, the intelligent power module can determine whether there is an overcurrent or short circuit based on the input voltage of the protection pin CIN. By switching the switch on and off states in response to the level signal at the signal connection status output terminal of the switching module, the input voltage of the protection pin CIN changes. This causes the intelligent power module to trigger the protection mechanism and shut off the power supply to the motor when any fault occurs in the control module or the motor drive module, thereby improving the safety of motor operation.

[0037] At this time, the switching transistor can be either a MOSFET or a bipolar transistor.

[0038] For example, in a drum washing machine application, if the drive chip is working normally, when the control module receives the logic signal corresponding to the open state from the door lock module, it outputs the logic signal corresponding to the braking action to the drive chip. The drive chip then applies an emergency brake, causing the washing machine drum speed to decrease rapidly. If the drive chip malfunctions, such as running away, the signal connection terminal of the control module loses its level signal. At this time, the level signal at the output terminal of the control module's signal connection status switches, the switch module switches, cuts off the power supply and output of the intelligent power module, and controls the motor to stop.

[0039] like Figure 2 As shown, in another case, the switching module includes at least a first switching circuit and a second switching circuit. The input terminal of the first switching circuit is connected to the signal connection status output terminal of the control module, the output terminal of the first switching circuit is connected to the power supply pin of the intelligent power module, the input terminal of the second switching circuit is connected to the signal connection status output terminal of the control module, and the output terminal of the second switching circuit is connected to the protection pin of the intelligent power module.

[0040] In this scenario, the first and second switching circuits receive the signal level signals from the signal connection status output terminals of the control module and respectively perform switching actions, simultaneously adjusting the power supply and protection states of the intelligent power module. If any abnormality occurs in either the control module or the driver chip, the signal level signal at the signal connection status output terminal changes, and both the first and second switching circuits are cut off. When the first switching circuit is functioning normally, the intelligent power module is powered off, and the motor stops running. Conversely, if the first switching circuit malfunctions, the cutoff effect of the second switching circuit triggers the intelligent power module's protection mechanism, shutting off the motor's power supply. By utilizing the first and second switching circuits, dual power-off protection is achieved in the event of any abnormality in the control module or the driver chip, improving the operational safety of the equipment.

[0041] Specifically, the first switching circuit includes at least a first switching transistor, and the second switching circuit includes at least a second switching transistor. By having the switching transistors exhibit conduction or cutoff characteristics under high and low level signals respectively, the power supply cutoff and protection mechanism triggering of the intelligent power module can be controlled according to the level signal at the output terminal based on the signal connection status.

[0042] Specifically, when the driver chip and the control module communicate normally, the signal connection terminal of the control module outputs a high-level signal, the signal connection status output terminal of the control module outputs a high-level signal, the first switch circuit and the second switch circuit are connected, the power supply pin and protection pin of the intelligent power module are in a high-level state, and the motor runs normally.

[0043] When the driver chip malfunctions, i.e. when the communication between the driver chip and the control module is abnormal, the signal connection terminal of the control module outputs a low-level signal, the signal connection status output terminal of the control module outputs a low-level signal, the first switch circuit and the second switch circuit are cut off, the power supply pin and protection pin of the intelligent power module switch to a low-level state, the motor is cut off from power and stops running.

[0044] It is understandable that the signal connection terminal of the control module only needs to output high and low level signals based on whether it receives the output signal from the driver chip. In other embodiments, the first and second switching circuits can also be turned on when the output terminal outputs a low level signal in the signal connection state using a combination of transistors and MOSFETs. In this case, the signal connection terminal of the control module outputs a high level signal when there is a communication error between the driver chip and the control module.

[0045] In the above three cases, the switching transistor can be a bipolar transistor, and the power supply cut-off and protection mechanism of the intelligent power module can be triggered by the conduction and cut-off of the bipolar transistor.

[0046] The switching transistor can also be a MOSFET. The power supply cut-off and protection mechanism of the intelligent power module are triggered by the conduction and cut-off of the MOSFET.

[0047] Preferably, the first switching transistor is a MOSFET, and the second switching transistor is a transistor. Since the first switching circuit is responsible for switching the power supply to and from the intelligent power module and needs to carry a large current, a MOSFET is used as the first switching transistor. The second switching circuit only needs to adjust the voltage of the protection pin of the intelligent power module and does not need to carry a large current; therefore, a more sensitive transistor is used as the second switching transistor.

[0048] Understandably, in applications where safety requirements are high, the first switching circuit can also be a combination of MOSFETs and transistors, and the second switching circuit can also be a combination of MOSFETs and transistors.

[0049] It should be noted that this embodiment only shows the necessary components for implementing this application. Under the requirements of circuit filtering, overcurrent protection, overvoltage protection, etc., the motor drive control system of this application can be supplemented with protective components such as filter circuits and protective resistors as needed to further improve the safety and stability of the motor drive control system.

[0050] The specific embodiments described above are preferred embodiments of the motor drive control system of this application, and are not intended to limit the specific scope of this application. The scope of this application includes but is not limited to the specific embodiments described above. All equivalent changes made in accordance with the shape and structure of this application are within the protection scope of this application.

Claims

1. A motor drive control system applied to a home appliance, characterized by: include: The system includes a power supply module, a control module, a motor drive module, and a switch module. The control module includes at least a power supply terminal, a signal connection terminal, and a signal connection status output terminal. The power supply module is connected to the power supply terminal of the control module. The motor drive module is connected to the signal connection terminal of the control module. The switch module is connected to the signal connection status output terminal of the control module. The switch module switches the power-on state of the motor drive module according to the level signal of the signal connection status output terminal.

2. The motor drive control system of claim 1, wherein: Also includes: A door lock module, which is connected to the feedback terminal of the control module.

3. The motor drive control system as described in claim 1, characterized in that: The switching module includes at least a switching transistor, the input terminal of which is connected to the signal connection status output terminal of the control module, and the output terminal of which is connected to the motor drive module.

4. The motor drive control system as described in claim 1, characterized in that: The motor drive module includes a drive chip and an intelligent power module connected to the controlled end of the motor. The drive chip is connected to the signal connection end of the control module and the signal input end of the intelligent power module, and the intelligent power module is connected to the switch module.

5. The motor drive control system as described in claim 4, characterized in that: The power supply pin of the intelligent power module is connected to the output terminal of the switching module.

6. The motor drive control system as described in claim 4, characterized in that: The protection pin of the intelligent power module is connected to the output terminal of the switching module.

7. The motor drive control system as described in claim 4, characterized in that: The switching module includes at least a first switching circuit and a second switching circuit. The input terminal of the first switching circuit is connected to the signal connection status output terminal of the control module, and the output terminal of the first switching circuit is connected to the power supply pin of the intelligent power module. The input terminal of the second switching circuit is connected to the signal connection status output terminal of the control module, and the output terminal of the second switching circuit is connected to the protection pin of the intelligent power module.

8. The motor drive control system as described in claim 7, characterized in that: The first switching circuit includes at least a first switching transistor, and the second switching circuit includes at least a second switching transistor.

9. The motor drive control system as described in claim 8, characterized in that: The first switching transistor is a MOSFET, a transistor, or a combination of a MOSFET and a transistor.

10. The motor drive control system as described in claim 7, characterized in that: When the signal connection terminal of the control module is communicating normally with the driver chip, it outputs a high-level signal. When the signal connection status output terminal of the control module outputs a high-level signal, the first switch circuit and the second switch circuit are connected, and the power supply pin and protection pin of the intelligent power module are in a high-level state. The signal connection end of the control module outputs a low-level signal when the driving chip and the control module communicate abnormally, the signal connection state output end of the control module outputs a low-level signal, the first switch circuit and the second switch circuit are cut off, and the power supply pin and the protection pin of the intelligent power module are switched to a low-level state.

Images