A signal compatible vacuum cleaner control circuit and apparatus

Abstract

This invention discloses a signal-compatible vacuum cleaner control circuit and device. The circuit includes a main control module, a power supply module, a motor drive module, a PWM control module, a back EMF monitoring module, a bus voltage acquisition module, an overcurrent protection module, and a temperature detection module. The PWM control module includes a connector and a PWM basic control unit. The connector includes a PWM signal terminal, an EN signal terminal, and a speed feedback signal terminal. The connector is connected to the main control module. The PWM basic control unit is electrically connected to the power supply module, the main control module, and the motor drive module, respectively. This invention is compatible with different signal types, meets the needs of different users, and eliminates the need for a complete PCB board replacement, saving hardware and R&D costs.

Description

Technical Field

[0001] This invention relates to the field of vacuum cleaner technology, and more particularly to a signal-compatible vacuum cleaner control circuit and device. Background Technology

[0002] A vacuum cleaner is a household appliance used to clean dust and debris from surfaces such as floors, furniture, and curtains. The working principle of a vacuum cleaner is to use a motor-driven fan to create negative pressure, forcing dust-laden air through the nozzle, hose, dust collector, and other components into the vacuum cleaner. The dust is then separated by a filtration system, and the purified air is discharged.

[0003] Currently, vacuum cleaners on the market mainly fall into two categories: corded and cordless. Both corded and cordless vacuum cleaners need to receive and process different signals in different scenarios, such as switch signals, mode signals, charging / discharging signals, and fault signals. These signals may originate from user operation buttons, remote controls, sensors, and other devices. Different signals may have different characteristics, such as amplitude, frequency, waveform, and encoding. Therefore, the control circuit of a vacuum cleaner needs to possess a certain degree of signal compatibility, meaning it must be able to recognize and respond to signals with different characteristics and execute corresponding actions based on the signal content.

[0004] However, current vacuum cleaner products on the market have certain issues with signal compatibility. Because different manufacturers or models of vacuum cleaners may employ different operating schemes, the same device has significant limitations. It's impossible to replace different schemes on the same PCB board to meet diverse user needs, requiring a major overhaul of the entire PCB control board, thus increasing hardware and R&D costs.

[0005] Furthermore, current vacuum cleaners on the market also have issues with standby power consumption. Because vacuum cleaners need to respond to user input or external signals at any time, their control circuits still need to maintain a certain operating voltage and current even when not in use, in order to receive and process signals promptly. This results in vacuum cleaners consuming power even in standby mode, increasing users' electricity costs and environmental burden. This is especially true for cordless vacuum cleaners, whose limited battery capacity means that standby power consumption shortens their battery life and affects their performance. Summary of the Invention

[0006] The purpose of this application is to provide a signal-compatible vacuum cleaner control circuit and device to solve the problems existing in the background art.

[0007] To address the aforementioned technical issues, this application provides a signal-compatible vacuum cleaner control circuit, including a main control module, a power supply module, a motor drive module, a PWM control module, and a back EMF monitoring module.

[0008] The power supply module is electrically connected to the main control module, the motor drive module, the PWM control module, and the back EMF monitoring module, respectively; the main control module is electrically connected to the motor drive module, the PWM control module, and the back EMF monitoring module, respectively.

[0009] The PWM control module includes a connector and a PWM basic control unit. The connector includes a PWM signal terminal, an EN signal terminal and a speed feedback signal terminal. The connector is connected to the main control module. The PWM basic control unit is electrically connected to the power supply module, the main control module and the motor drive module respectively.

[0010] Preferably, the signal-compatible vacuum cleaner control circuit further includes a bus voltage acquisition module, an overcurrent protection module, and a temperature detection module;

[0011] The power supply module is electrically connected to the bus voltage acquisition module, the overcurrent protection module, and the temperature detection module, respectively. The main control module is electrically connected to the bus voltage acquisition module, the overcurrent protection module, and the temperature detection module, respectively. The overcurrent protection module is electrically connected to the motor drive module.

[0012] Preferably, the PWM basic control unit includes a first transistor, a first MOSFET, a first diode, a three-terminal regulator, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, and a tenth resistor;

[0013] The base of the first transistor is electrically connected to the first terminal of the first resistor, the PWM signal terminal, the EN signal terminal, and the main control module, respectively. The emitter of the first transistor and the second terminal of the first resistor are grounded. The collector of the first transistor is electrically connected to the first terminal of the second resistor. The second terminal of the second resistor is electrically connected to the first terminal of the third resistor. The second terminal of the third resistor is electrically connected to the gate of the first MOSFET and the first terminal of the fourth resistor, respectively. The second terminal of the fourth resistor is electrically connected to the power module, the drain of the first MOSFET, and the first terminal of the fifth resistor, respectively. The second terminal of the fifth resistor is electrically connected to the source of the first MOSFET and the three-terminal regulator, respectively. The three-terminal regulator is electrically connected to the power module.

[0014] The cathode of the first diode is electrically connected to the PWM signal terminal and the first terminal of the sixth resistor, respectively. The second terminal of the sixth resistor is electrically connected to the main control module. The first terminal of the seventh resistor is electrically connected to the speed feedback signal terminal and the first terminal of the eighth resistor, respectively. The second terminal of the seventh resistor is electrically connected to the power supply module. The second terminal of the eighth resistor is electrically connected to the first terminal of the ninth resistor. The second terminal of the ninth resistor is electrically connected to the main control module. The first terminal of the tenth resistor is electrically connected to the PWM signal terminal. The second terminal of the tenth resistor and the cathode of the first diode are grounded.

[0015] Preferably, the PWM control module includes a first low-power control unit; the first low-power control unit includes an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, and a first capacitor;

[0016] The first end of the eleventh resistor is electrically connected to the PWM signal terminal. The second end of the eleventh resistor is electrically connected to the first end of the twelfth resistor, the power module, and the drain of the first MOS transistor. The second end of the twelfth resistor is electrically connected to the first end of the thirteenth resistor and the base of the first transistor. The second end of the thirteenth resistor is electrically connected to the main control module and the first end of the fourteenth resistor. The second end of the fourteenth resistor is grounded. The first end of the first capacitor is electrically connected to the second end of the second resistor and the first end of the third resistor. The second end of the first capacitor is grounded.

[0017] Preferably, the PWM control module further includes a second low-power control unit, which includes the twelfth resistor, the thirteenth resistor, the fourteenth resistor, the first capacitor, the second transistor, the second diode, the fifteenth resistor, and the sixteenth resistor;

[0018] The first end of the fifteenth resistor is electrically connected to the collector of the second transistor, the PWM signal terminal, the cathode of the second diode, the first end of the twelfth resistor, the power module, and the drain of the first MOS transistor. The second end of the fifteenth resistor is electrically connected to the power module. The base of the second transistor is electrically connected to the first end of the sixteenth resistor. The second end of the sixteenth resistor is electrically connected to the first end of the fifteenth resistor. The collector of the second transistor is grounded, and the anode of the second diode is grounded.

[0019] Preferably, the PWM control module includes a low-level enable unit, which includes the thirteenth resistor, the fourteenth resistor, the third transistor, the third diode, the seventeenth resistor, the eighteenth resistor, and the nineteenth resistor;

[0020] The first end of the seventeenth resistor is electrically connected to the PWM signal terminal, the first end of the thirteenth resistor, and the base of the first transistor. The second end of the seventeenth resistor is electrically connected to the first end of the eighteenth resistor and the base of the third transistor. The second end of the eighteenth resistor is electrically connected to the drain of the first MOS transistor and the power module. The collector of the third transistor is grounded. The emitter of the third transistor is electrically connected to the second end of the second resistor and the first end of the third resistor. The first end of the nineteenth resistor is electrically connected to the cathode of the third diode and the EN signal terminal. The anode of the third diode is electrically connected to the first end of the seventeenth resistor. The second end of the nineteenth resistor is electrically connected to the main control module.

[0021] Preferably, the PWM control module includes a high-level enable unit; the high-level enable unit includes the twelfth resistor, the thirteenth resistor, the fourteenth resistor, the twentieth resistor, and the fourth diode;

[0022] The first end of the twelfth resistor is electrically connected to the PWM signal terminal. The second end of the twelfth resistor is electrically connected to the first end of the thirteenth resistor and the base of the first transistor. The second end of the thirteenth resistor is electrically connected to the main control module and the first end of the fourteenth resistor. The second end of the fourteenth resistor is grounded. The first end of the twentieth resistor is electrically connected to the EN signal terminal. The second end of the twentieth resistor is electrically connected to the main control module. The anode of the fourth diode is electrically connected to the first end of the twentieth resistor. The cathode of the fourth diode is electrically connected to the first end of the twelfth resistor.

[0023] Preferably, the PWM control module includes a speed feedback unit; the speed feedback unit includes a second capacitor and a third capacitor;

[0024] The first terminal of the second capacitor is electrically connected to the speed feedback signal terminal, and the second terminal of the second capacitor is grounded. The third capacitor is electrically connected to the second terminal of the eighth resistor and the first terminal of the ninth resistor, respectively, and the second terminal of the third capacitor is grounded.

[0025] Preferably, the motor drive module includes a first negative pressure drive unit, a second negative pressure drive unit, a third negative pressure drive unit, a single-resistor current sampling unit, and a power sampling unit;

[0026] The first negative pressure drive unit is electrically connected to the second negative pressure drive unit, the third negative pressure drive unit, the power module, the main control module, the back electromotive force monitoring module, and the first stator winding of the drive motor, respectively.

[0027] The second negative pressure drive unit is electrically connected to the first negative pressure drive unit, the third negative pressure drive unit, the power module, the main control module, the back electromotive force monitoring module, and the second stator winding of the drive motor, respectively.

[0028] The third negative pressure drive unit is electrically connected to the first negative pressure drive unit, the second negative pressure drive unit, the power module, the main control module, the back electromotive force monitoring module, and the third stator winding of the drive motor, respectively.

[0029] The single-resistor current sampling unit is electrically connected to the third negative voltage driving unit and the main control module, respectively;

[0030] The power sampling unit is electrically connected to the first negative pressure driving unit, the second negative pressure driving unit, the third negative pressure driving unit, and the main control module, respectively.

[0031] Preferably, the back EMF monitoring module includes a first back EMF monitoring unit, a second back EMF monitoring unit, and a third back EMF monitoring unit.

[0032] The first back EMF monitoring unit is electrically connected to the first stator winding and the main control module, the second back EMF monitoring unit is electrically connected to the second stator winding and the main control module, and the third back EMF monitoring unit is electrically connected to the third stator winding and the main control module.

[0033] To address the aforementioned technical problems, this application provides a signal-compatible vacuum cleaner control device, including the aforementioned signal-compatible vacuum cleaner control circuit.

[0034] The present invention discloses a signal-compatible vacuum cleaner control circuit and device with the following advantages: The signal-compatible vacuum cleaner control circuit includes a main control module, a power supply module, a motor drive module, a PWM control module, and a back EMF monitoring module. The PWM control module includes a connector and a PWM basic control unit. The connector includes a PWM signal terminal, an EN signal terminal, and a speed feedback signal terminal. The connector is connected to the main control module, and the PWM basic control unit is electrically connected to the power supply module, the main control module, and the motor drive module. The main control module controls the output of the PWM signal through the PWM control module to control the power supply module. The feedback EMF monitoring module monitors the back EMF of the brushless DC motor. By providing a connector that connects to the PWM basic control unit, and the connector having a PWM signal terminal, an EN signal terminal, and a speed feedback signal terminal, different components can be added to the PWM basic control unit to match the PWM signal terminal, EN signal terminal, or speed feedback signal terminal, allowing for different operating modes of the brushless DC vacuum cleaner to be set according to different customer needs. Therefore, this invention is compatible with different signal types, meets the needs of different users, and eliminates the need to replace the entire PCB board, saving hardware and R&D costs. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort:

[0036] Figure 1 This is a schematic diagram of a signal-compatible vacuum cleaner control circuit according to a preferred embodiment of the present invention;

[0037] Figure 2 This is a circuit schematic diagram of the main control module 1 according to a preferred embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of another signal-compatible vacuum cleaner control circuit according to a preferred embodiment of the present invention;

[0039] Figure 4 and Figure 5 This is a circuit schematic diagram of a PWM control module according to a preferred embodiment of the present invention;

[0040] Figure 6 This is a schematic diagram of the patch panels for each mode in a PWM control module according to a preferred embodiment of the present invention;

[0041] Figure 7This is a circuit schematic diagram of a motor drive module according to a preferred embodiment of the present invention;

[0042] Figure 8 This is a circuit diagram of a back electromotive force monitoring module according to a preferred embodiment of the present invention;

[0043] Figure 9 This is a circuit diagram of a bus voltage acquisition module, an overcurrent protection module, and a temperature detection module according to a preferred embodiment of the present invention. Detailed Implementation

[0044] The core of this application is to provide a signal-compatible vacuum cleaner control circuit and device. In this solution, a connector is set up to connect to the PWM basic control unit. The connector is equipped with a PWM signal terminal, an EN signal terminal, and a speed feedback signal terminal. According to different customer needs, different components can be set on the basis of the PWM basic control unit to cooperate with the PWM signal terminal, the EN signal terminal, or the speed feedback signal terminal to realize the setting of different working modes of the DC brushless vacuum cleaner.

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments 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.

[0046] Please see Figure 1 , Figure 1 A schematic diagram of a signal-compatible vacuum cleaner control circuit provided in this application includes a main control module 1, a power supply module 2, a motor drive module 3, a PWM control module 4, and a back EMF monitoring module 5;

[0047] Power module 2 is electrically connected to main control module 1, motor drive module 3, PWM control module 4 and back EMF monitoring module 5 respectively; main control module 1 is electrically connected to motor drive module 3, PWM control module 4 and back EMF monitoring module 5 respectively.

[0048] The PWM control module 4 includes a connector 41 and a PWM basic control unit 42. The connector 41 includes a PWM signal terminal, an EN signal terminal and a speed feedback signal terminal. The connector 41 is connected to the main control module 1. The PWM basic control unit 42 is electrically connected to the power supply module 2, the main control module 1 and the motor drive module 3 respectively.

[0049] In the current technology, vacuum cleaner products on the market have certain issues with signal compatibility. Because different manufacturers or models of vacuum cleaners may employ different operating schemes, the same device has significant limitations. It's impossible to replace different schemes on the same PCB board to meet different user needs, requiring a major overhaul of the entire PCB control board, thus increasing hardware and R&D costs.

[0050] To address the aforementioned shortcomings, this application achieves compatible control of different signal types and low standby power consumption through the cooperation of the main control module 1, power supply module 2, motor drive module 3, PWM control module 4, back EMF monitoring module 5, bus voltage acquisition module 6, overcurrent protection module 7, and temperature detection module 8.

[0051] Specifically, this application sets up a connector that connects to the PWM basic control unit. The connector is equipped with a PWM signal terminal, an EN signal terminal, and a speed feedback signal terminal. Depending on different customer needs, different components can be set on the basis of the PWM basic control unit to cooperate with the PWM signal terminal, EN signal terminal, or speed feedback signal terminal to realize the setting of different working modes of the DC brushless vacuum cleaner. The working modes include a first low power mode, a second low power mode, a low level enable mode, a high level enable mode, and a speed feedback mode, thereby meeting the usage needs of different users without replacing the entire PCB board, saving hardware and R&D costs.

[0052] Please refer to Figure 2 , Figure 2 The circuit schematic diagram of the main control module 1 provided in this application.

[0053] Specifically, in this embodiment, the main control module 1 is configured as an MCU (Microcontroller Unit; MCU), also known as a single-chip microcomputer or microcontroller, which is a central processing unit (CPU) with its frequency and specifications appropriately reduced, and integrates peripheral interfaces such as memory, timer, USB, A / D converter, UART, PLC, DMA, and even LCD driver circuitry onto a single chip to form a chip-level computer, model LKS084D. In another preferred embodiment, the chip model of the main control module 1 is not specifically limited.

[0054] In summary, this application provides a signal-compatible vacuum cleaner control circuit, which includes: a main control module 1, a power supply module 2, a motor drive module 3, a PWM control module 4, a back EMF monitoring module 5, a bus voltage acquisition module 6, an overcurrent protection module 7, and a temperature detection module 8. The PWM control module 4 includes a connector and a PWM basic control unit. The connector includes a PWM signal terminal, an EN signal terminal, and a speed feedback signal terminal. The connector is connected to the main control module 1. The PWM basic control unit is electrically connected to the power supply module 2, the main control module 1, and the motor drive module 3, respectively. Therefore, this invention can be compatible with different signal types and achieve low standby power consumption.

[0055] Based on the above embodiments:

[0056] Please refer to Figure 3 , Figure 3 A schematic diagram of another signal-compatible vacuum cleaner control circuit provided in this application.

[0057] As a preferred embodiment, a signal-compatible vacuum cleaner control circuit further includes a bus voltage acquisition module 6, an overcurrent protection module 7, and a temperature detection module 8;

[0058] Power module 2 is electrically connected to bus voltage acquisition module 6, overcurrent protection module 7 and temperature detection module 8 respectively. Main control module 1 is electrically connected to bus voltage acquisition module 6, overcurrent protection module 7 and temperature detection module 8 respectively. Overcurrent protection module 7 is electrically connected to motor drive module 5.

[0059] Specifically, in this embodiment, the bus voltage acquisition module 6 is used to acquire the bus voltage and transmit it to the main control module 1 for real-time monitoring; the overcurrent protection module 7 is used to implement overcurrent protection for the motor drive module 3; and the temperature detection module 8 is used to detect the battery temperature of the vacuum cleaner and transmit it to the main control module 1 for monitoring.

[0060] Please refer to Figure 4 and Figure 5 , Figure 4 and Figure 5 The circuit schematic diagram of a PWM control module provided in this application.

[0061] Please refer to Figure 6 , Figure 6 This is a schematic diagram of the patch panels for each mode in a PWM control module provided in this application.

[0062] In one preferred embodiment, the PWM basic control unit includes a first transistor Q2, a first MOSFET Q1, a first diode ZD1, a three-terminal regulator U3, a first resistor R44, a second resistor R9, a third resistor R37, a fourth resistor R7, a fifth resistor R30, a sixth resistor R12, a seventh resistor R14, an eighth resistor R5, a ninth resistor R47, and a tenth resistor R13.

[0063] The base of the first transistor Q2 is electrically connected to the first terminal of the first resistor R44, the PWM signal terminal, the EN signal terminal, and the main control module 1, respectively. The emitter of the first transistor Q2 and the second terminal of the first resistor R44 are grounded. The collector of the first transistor Q2 is electrically connected to the first terminal of the second resistor R9. The second terminal of the second resistor R9 is electrically connected to the first terminal of the third resistor R37. The second terminal of the third resistor R37 is electrically connected to the gate of the first MOSFET Q1 and the first terminal of the fourth resistor R7, respectively. The second terminal of the fourth resistor R7 is electrically connected to the power module 2, the drain of the first MOSFET Q1, and the first terminal of the fifth resistor R30, respectively. The second terminal of the fifth resistor R30 is electrically connected to the source of the first MOSFET Q1 and the three-terminal regulator U3, respectively. The three-terminal regulator U3 is electrically connected to the power module 2.

[0064] The cathode of the first diode ZD1 is electrically connected to the PWM signal terminal and the first terminal of the sixth resistor R12. The second terminal of the sixth resistor R12 is electrically connected to the main control module 1. The first terminal of the seventh resistor R14 is electrically connected to the speed feedback signal terminal and the first terminal of the eighth resistor R5. The second terminal of the seventh resistor is electrically connected to the power supply module 2. The second terminal of the eighth resistor R5 is electrically connected to the first terminal of the ninth resistor R47. The second terminal of the ninth resistor R47 is electrically connected to the main control module 1. The first terminal of the tenth resistor R13 is electrically connected to the PWM signal terminal. The second terminal of the tenth resistor R13 and the cathode of the first diode ZD1 are grounded.

[0065] Specifically, in the PWM basic control unit, the three-terminal regulator U3 is the protection circuit for power module 2, which plays the role of voltage stabilization and voltage reduction.

[0066] In a preferred embodiment, the PWM control module 4 includes a first low-power control unit; the first low-power control unit includes an eleventh resistor R40, a twelfth resistor R42, a thirteenth resistor R43, a fourteenth resistor R45, and a first capacitor C10;

[0067] The first end of the eleventh resistor R40 is electrically connected to the PWM signal terminal. The second end of the eleventh resistor R40 is electrically connected to the first end of the twelfth resistor R42, the power module 2, and the drain of the first MOSFET. The second end of the twelfth resistor R42 is electrically connected to the first end of the thirteenth resistor R43 and the base of the first transistor. The second end of the thirteenth resistor R43 is electrically connected to the main control module 1 and the first end of the fourteenth resistor R45. The second end of the fourteenth resistor R45 is grounded. The first end of the first capacitor C10 is electrically connected to the second end of the second resistor and the first end of the third resistor. The second end of the first capacitor C10 is grounded.

[0068] Specifically, when a pulsed PWM signal is input to the PWM port, the PWM signal drives the base of the first transistor Q2 to turn on momentarily through the eleventh resistor R40 and the twelfth resistor R42. The first MOSFET Q1 then turns on, and the power module 2 supplies power to the main control module 1. The main control module 1 then outputs a high level on the POWER_ON pin, keeping the first transistor Q2 on for an extended period. The first capacitor C10 is used to increase the time the second resistor R9 is short-circuited to ground during the moment the first transistor Q2 turns on, maintaining the first MOSFET Q1 on for a period of time. In this embodiment, the circuit of the first low-power control unit has a positive feedback loop, achieving the purpose of using an external PWM signal to start the vacuum cleaner. When the vacuum cleaner needs to enter standby mode, the main control module 1 outputs a low level on the POWER_ON pin, turning off the first transistor Q2 and the first MOSFET Q1, disconnecting the power supply to the main control module 1, thus achieving low power consumption.

[0069] In a preferred embodiment, the PWM control module 4 further includes a second low-power control unit, which includes a twelfth resistor R42, a thirteenth resistor R43, a fourteenth resistor R45, a first capacitor C10, a second transistor Q4, a second diode ZD2, a fifteenth resistor R11, and a sixteenth resistor R46.

[0070] The first end of the fifteenth resistor is electrically connected to the collector of the second transistor Q4, the PWM signal terminal, the cathode of the second diode ZD2, the first end of the twelfth resistor R42, the power module 2, and the drain of the first MOSFET. The second end of the fifteenth resistor R11 is electrically connected to the power module 2. The base of the second transistor Q4 is electrically connected to the first end of the sixteenth resistor R46. The second end of the sixteenth resistor R46 is electrically connected to the first end of the fifteenth resistor R11. The collector of the second transistor Q4 is grounded, and the anode of the second diode ZD2 is grounded.

[0071] Specifically, when a PWM pulse signal is input to the PWM port, the PWM signal is reversed through the fifteenth resistor R11, the sixteenth resistor R46 and the second transistor Q4, and its working principle is the same as that of the first low-power control unit; the second diode ZD2 is used to prevent the high voltage of the B+ port of the battery module 2 from entering the main control module 1 through the twelfth resistor R42 and the thirteenth resistor R43 and damaging the main control module 1.

[0072] In a preferred embodiment, the PWM control module 4 includes a low-level enable unit, which includes a thirteenth resistor R43, a fourteenth resistor R45, a third transistor Q3, a third diode D5, a seventeenth resistor R10, an eighteenth resistor R8, and a nineteenth resistor R39.

[0073] The first end of the seventeenth resistor R10 is electrically connected to the PWM signal terminal, the first end of the thirteenth resistor R43, and the base of the first transistor. The second end of the seventeenth resistor R10 is electrically connected to the first end of the eighteenth resistor R8 and the base of the third transistor Q3. The second end of the eighteenth resistor R8 is electrically connected to the drain of the first MOSFET Q1 and the power module 2. The collector of the third transistor Q3 is grounded. The emitter of the third transistor Q3 is electrically connected to the second end of the second resistor and the first end of the third resistor. The first end of the nineteenth resistor R39 is electrically connected to the cathode of the third diode D5 and the EN signal terminal. The anode of the third diode D5 is electrically connected to the first end of the seventeenth resistor R10. The second end of the nineteenth resistor R39 is electrically connected to the main control module 1.

[0074] Specifically, in this embodiment, the EN signal terminal is at a low level. The three transistors Q3 are turned on through the seventeenth resistor R10, which pulls the voltage of the first capacitor C10 low, allowing the first MOSFET Q1 to turn on. The main control module 1 is powered by voltage and starts to work. The main control module 1 detects the level of the EN signal terminal through the third diode D5. If it is low, the third diode D5 outputs a high level on the POWER_ON pin, keeping the first transistor Q2 on for a long time. The first capacitor C10 increases the time that the second resistor R9 is short-circuited to ground at the moment the first MOSFET Q1 is turned on, maintaining the first MOSFET Q1 on for a period of time.

[0075] In a preferred embodiment, the PWM control module 4 includes a high-level enable unit; the high-level enable unit includes a twelfth resistor R42, a thirteenth resistor R43, a fourteenth resistor R45, a twentieth resistor R38, and a fourth diode D7;

[0076] The first terminal of the twelfth resistor R42 is electrically connected to the PWM signal terminal. The second terminal of the twelfth resistor R42 is electrically connected to the first terminal of the thirteenth resistor R43 and the base of the first transistor. The second terminal of the thirteenth resistor R43 is electrically connected to the main control module 1 and the first terminal of the fourteenth resistor R45. The second terminal of the fourteenth resistor R45 is grounded. The first terminal of the twentieth resistor R38 is electrically connected to the EN signal terminal. The second terminal of the twentieth resistor R38 is electrically connected to the main control module 1. The anode of the fourth diode D7 is electrically connected to the first terminal of the twentieth resistor R38. The cathode of the fourth diode D7 is electrically connected to the first terminal of the twelfth resistor R42.

[0077] Specifically, in this embodiment, the EN signal terminal, through the fourth diode D7 and the twelfth resistor R42, causes the base of the first transistor Q2 to turn on momentarily, and the first MOSFET Q1 turns on again, so that the power module 2 supplies power to the main control module 1; when the main control module 1 detects that the EN signal terminal is high through the twentieth resistor R38, the main control module 1 outputs a high level on the POWER_ON pin, so that the first transistor Q2 remains on for a long time.

[0078] In one preferred embodiment, the PWM control module 4 includes a speed feedback unit; the speed feedback unit includes a second capacitor C4 and a third capacitor C1;

[0079] The first terminal of the second capacitor C4 is electrically connected to the speed feedback signal terminal, and the second terminal of the second capacitor C4 is grounded. The third capacitor C1 is electrically connected to the second terminal of the eighth resistor and the first terminal of the ninth resistor, respectively, and the second terminal of the third capacitor C1 is grounded.

[0080] Specifically, in this embodiment, the main control module 1 outputs a PWM signal to provide feedback on rotational speed information, and the second capacitor C4 and the third capacitor C1 are used to convert the PWM signal into a DC signal.

[0081] Please refer to Figure 7 , Figure 7 The circuit diagram of a motor drive module provided in this application.

[0082] In a preferred embodiment, the motor drive module 3 includes a first negative pressure drive unit 31, a second negative pressure drive unit 32, a third negative pressure drive unit 33, a single-resistor current sampling unit 34, and a power sampling unit 35;

[0083] The first negative pressure drive unit 31 is electrically connected to the second negative pressure drive unit 32, the third negative pressure drive unit 33, the power supply module 2, the main control module 1, the back electromotive force monitoring module 5, and the first stator winding of the drive motor, respectively.

[0084] The second negative pressure drive unit 32 is electrically connected to the first negative pressure drive unit 31, the third negative pressure drive unit 33, the power module 2, the main control module 1, the back EMF monitoring module 5, and the second stator winding of the drive motor, respectively.

[0085] The third negative pressure drive unit 33 is electrically connected to the first negative pressure drive unit 31, the second negative pressure drive unit 32, the power module 2, the main control module 1, the back electromotive force monitoring module 5, and the third stator winding of the drive motor, respectively.

[0086] The single-resistor current sampling unit 34 is electrically connected to the third negative voltage drive unit 33 and the main control module 1, respectively.

[0087] The power sampling unit 35 is electrically connected to the first negative pressure drive unit 31, the second negative pressure drive unit 32, the third negative pressure drive unit 33 and the main control module 1, respectively.

[0088] Specifically, in this embodiment, the motor drive module uses a three-phase half-bridge drive circuit to drive a brushless DC motor. A brushless DC motor requires three sets of alternating voltages to excite the stator windings, generating a rotating magnetic field that drives the rotor to rotate. These three sets of voltages are controlled by three signals, UVW, which are output by an encoder or Hall effect sensor to indicate changes in the motor's position.

[0089] Specifically, the schematic diagram shows six MOSFETs: UH, UL, VH, VL, WH, and WL. These are connected to the positive and negative terminals of the power supply, forming three sets of half-bridge switches. Each half-bridge switch consists of two MOSFETs; for example, UH and UL form one half-bridge switch. These switches can control whether one end of the motor winding is connected to the positive or negative terminal of the power supply, or left floating. When UH is on, UL is off, and one end of the motor winding is connected to the positive terminal of the power supply; when UH is off, UL is on, and one end of the motor winding is connected to the negative terminal of the power supply; when both UH and UL are off, one end of the motor winding is floating. Similarly, the other two sets of half-bridge switches can control the other two ends of the motor winding.

[0090] Specifically, the schematic shows three diodes forming a reverse diode configuration. The function of the reverse diode is to prevent reverse current from flowing through the MOSFET when it is turned on, thus avoiding damage to the MOSFET. The direction of the reverse diode should be opposite to the conduction direction of the MOSFET.

[0091] The schematic contains 21 resistors, six of which are connected in series with the MOSFET. R21, R23, R26, R28, R32, and R34 form current-limiting resistors. The purpose of these current-limiting resistors is to limit the current flowing through the MOSFET when it is turned on, preventing excessive current from damaging the MOSFET. The size of the current-limiting resistors should be selected based on the MOSFET's rated parameters and actual operating conditions. R22, R24, R27, R29, R33, and R35 form pull-up resistors. The purpose of the pull-up resistors is to provide a stable bias voltage during MOSFET switching, preventing the MOSFET from being in an uncertain state. The size of the pull-up resistors should be selected based on the MOSFET's gate input characteristics and the required bias voltage. Multiple capacitors form bypass capacitors. The purpose of the bypass capacitors is to provide a transient drive current source during MOSFET switching, allowing the MOSFET's gate parasitic capacitance to charge and discharge rapidly, shortening the MOSFET's switching time. The size of the bypass capacitors should be selected based on the MOSFET's gate parasitic capacitance and the required switching speed.

[0092] Specifically, either the single-resistor current sampling unit 34 or the power sampling unit 35 can be selected, and no specific limitation is made here.

[0093] Please refer to Figure 8 , Figure 8 The circuit diagram of a back EMF monitoring module provided in this application.

[0094] In a preferred embodiment, the back EMF monitoring module 5 includes a first back EMF monitoring unit 51, a second back EMF monitoring unit 52, and a third back EMF monitoring unit 53.

[0095] The first back EMF monitoring unit 51 is electrically connected to the first stator winding and the main control module 1, the second back EMF monitoring unit 52 is electrically connected to the second stator winding and the main control module 1, and the third back EMF monitoring unit 53 is electrically connected to the third stator winding and the main control module 1.

[0096] Specifically, in this embodiment, the first back EMF monitoring unit 51 is used to monitor the back EMF voltage value of the first negative voltage driving unit 31, the second back EMF monitoring unit 52 is used to monitor the back EMF voltage value of the second negative voltage driving unit 32, and the third back EMF monitoring unit 53 is used to monitor the back EMF voltage value of the third negative voltage driving unit 33. The back EMF monitoring module 5 uses a resistor to guide the reverse induced electromotive force generated by the stator coil to the capacitor, thereby suppressing the sudden change of current and feeding the stored energy back to the power supply or using it for other purposes.

[0097] Please refer to Figure 9 , Figure 9 The circuit diagram of a bus voltage acquisition module, an overcurrent protection module, and a temperature detection module provided in this application.

[0098] Specifically, in this embodiment, the principles of the bus voltage acquisition module, overcurrent protection module, and temperature detection module can be found in [reference needed]. Figure 9 This will not be elaborated upon here.

[0099] This application also provides a signal-compatible vacuum cleaner control device, including a signal-compatible vacuum cleaner control circuit.

[0100] For a description of the signal-compatible vacuum cleaner control circuit provided in this application, please refer to the above embodiments; further details will not be repeated here.

[0101] It should be noted that, in this specification, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0102] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A signal-compatible vacuum cleaner control circuit, characterized in that, It includes a main control module, a power supply module, a motor drive module, a PWM control module, and a back EMF monitoring module; The power supply module is electrically connected to the main control module, the motor drive module, the PWM control module, and the back EMF monitoring module, respectively; the main control module is electrically connected to the motor drive module, the PWM control module, and the back EMF monitoring module, respectively. The PWM control module includes a connector and a PWM basic control unit. The connector includes a PWM signal terminal, an EN signal terminal and a speed feedback signal terminal. The connector is connected to the main control module. The PWM basic control unit is electrically connected to the power supply module, the main control module and the motor drive module respectively. The PWM basic control unit includes a first transistor, a first MOSFET, a three-terminal regulator, a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor; The base of the first transistor is electrically connected to the first terminal of the first resistor, the PWM signal terminal, the EN signal terminal, and the main control module, respectively. The emitter of the first transistor and the second terminal of the first resistor are grounded. The collector of the first transistor is electrically connected to the first terminal of the second resistor. The second terminal of the second resistor is electrically connected to the first terminal of the third resistor. The second terminal of the third resistor is electrically connected to the gate of the first MOSFET and the first terminal of the fourth resistor, respectively. The second terminal of the fourth resistor is electrically connected to the power module, the drain of the first MOSFET, and the first terminal of the fifth resistor, respectively. The second terminal of the fifth resistor is electrically connected to the source of the first MOSFET and the three-terminal regulator, respectively. The three-terminal regulator is electrically connected to the power module. The PWM control module includes a first low-power control unit; the first low-power control unit includes an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, and a first capacitor; The first end of the eleventh resistor is electrically connected to the PWM signal terminal. The second end of the eleventh resistor is electrically connected to the first end of the twelfth resistor, the power module, and the drain of the first MOS transistor. The second end of the twelfth resistor is electrically connected to the first end of the thirteenth resistor and the base of the first transistor. The second end of the thirteenth resistor is electrically connected to the main control module and the first end of the fourteenth resistor. The second end of the fourteenth resistor is grounded. The first end of the first capacitor is electrically connected to the second end of the second resistor and the first end of the third resistor. The second end of the first capacitor is grounded. When the vacuum cleaner needs to enter standby mode, the main control module outputs a low level on the POWER_ON pin, turning off the first transistor and the first MOSFET, and disconnecting the power supply to the main control module to achieve low power consumption.

2. The signal-compatible vacuum cleaner control circuit according to claim 1, characterized in that, The PWM basic control unit also includes a first diode, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, and a tenth resistor; The cathode of the first diode is electrically connected to the PWM signal terminal and the first terminal of the sixth resistor, respectively. The second terminal of the sixth resistor is electrically connected to the main control module. The first terminal of the seventh resistor is electrically connected to the speed feedback signal terminal and the first terminal of the eighth resistor, respectively. The second terminal of the seventh resistor is electrically connected to the power supply module. The second terminal of the eighth resistor is electrically connected to the first terminal of the ninth resistor. The second terminal of the ninth resistor is electrically connected to the main control module. The first terminal of the tenth resistor is electrically connected to the PWM signal terminal. The second terminal of the tenth resistor and the cathode of the first diode are grounded.

3. The signal-compatible vacuum cleaner control circuit according to claim 1, characterized in that, The signal-compatible vacuum cleaner control circuit also includes a bus voltage acquisition module, an overcurrent protection module, and a temperature detection module. The power supply module is electrically connected to the bus voltage acquisition module, the overcurrent protection module, and the temperature detection module, respectively. The main control module is electrically connected to the bus voltage acquisition module, the overcurrent protection module, and the temperature detection module, respectively. The overcurrent protection module is electrically connected to the motor drive module.

4. The signal-compatible vacuum cleaner control circuit according to claim 1, characterized in that, The PWM control module further includes a second low-power control unit, which includes the twelfth resistor, the thirteenth resistor, the fourteenth resistor, the first capacitor, the second transistor, the second diode, the fifteenth resistor, and the sixteenth resistor. The first end of the fifteenth resistor is electrically connected to the collector of the second transistor, the PWM signal terminal, the cathode of the second diode, the first end of the twelfth resistor, the power module, and the drain of the first MOS transistor. The second end of the fifteenth resistor is electrically connected to the power module. The base of the second transistor is electrically connected to the first end of the sixteenth resistor. The second end of the sixteenth resistor is electrically connected to the first end of the fifteenth resistor. The collector of the second transistor is grounded, and the anode of the second diode is grounded.

5. The signal-compatible vacuum cleaner control circuit according to claim 1, characterized in that, The PWM control module includes a low-level enable unit, which includes the thirteenth resistor, the fourteenth resistor, the third transistor, the third diode, the seventeenth resistor, the eighteenth resistor, and the nineteenth resistor. The first end of the seventeenth resistor is electrically connected to the PWM signal terminal, the first end of the thirteenth resistor, and the base of the first transistor. The second end of the seventeenth resistor is electrically connected to the first end of the eighteenth resistor and the base of the third transistor. The second end of the eighteenth resistor is electrically connected to the drain of the first MOS transistor and the power module. The collector of the third transistor is grounded. The emitter of the third transistor is electrically connected to the second end of the second resistor and the first end of the third resistor. The first end of the nineteenth resistor is electrically connected to the cathode of the third diode and the EN signal terminal. The anode of the third diode is electrically connected to the first end of the seventeenth resistor. The second end of the nineteenth resistor is electrically connected to the main control module.

6. The signal-compatible vacuum cleaner control circuit according to claim 1, characterized in that, The PWM control module includes a high-level enable unit; the high-level enable unit includes the twelfth resistor, the thirteenth resistor, the fourteenth resistor, the twentieth resistor, and the fourth diode; The first end of the twelfth resistor is electrically connected to the PWM signal terminal. The second end of the twelfth resistor is electrically connected to the first end of the thirteenth resistor and the base of the first transistor. The second end of the thirteenth resistor is electrically connected to the main control module and the first end of the fourteenth resistor. The second end of the fourteenth resistor is grounded. The first end of the twentieth resistor is electrically connected to the EN signal terminal. The second end of the twentieth resistor is electrically connected to the main control module. The anode of the fourth diode is electrically connected to the first end of the twentieth resistor. The cathode of the fourth diode is electrically connected to the first end of the twelfth resistor.

7. A signal-compatible vacuum cleaner control circuit according to claim 2, characterized in that, The PWM control module includes a speed feedback unit; the speed feedback unit includes a second capacitor and a third capacitor. The first terminal of the second capacitor is electrically connected to the speed feedback signal terminal, and the second terminal of the second capacitor is grounded. The third capacitor is electrically connected to the second terminal of the eighth resistor and the first terminal of the ninth resistor, respectively, and the second terminal of the third capacitor is grounded. The main control module outputs a PWM signal to provide feedback on rotational speed information, and the second and third capacitors are used to convert the PWM signal into a DC signal.

8. A signal-compatible vacuum cleaner control circuit according to claim 1, characterized in that, The motor drive module includes a first negative pressure drive unit, a second negative pressure drive unit, a third negative pressure drive unit, a single-resistor current sampling unit, and a power sampling unit; The first negative pressure drive unit is electrically connected to the second negative pressure drive unit, the third negative pressure drive unit, the power module, the main control module, the back electromotive force monitoring module, and the first stator winding of the drive motor, respectively. The second negative pressure drive unit is electrically connected to the first negative pressure drive unit, the third negative pressure drive unit, the power module, the main control module, the back electromotive force monitoring module, and the second stator winding of the drive motor, respectively. The third negative pressure drive unit is electrically connected to the first negative pressure drive unit, the second negative pressure drive unit, the power module, the main control module, the back electromotive force monitoring module, and the third stator winding of the drive motor, respectively. The single-resistor current sampling unit is electrically connected to the third negative voltage driving unit and the main control module, respectively; The power sampling unit is electrically connected to the first negative pressure driving unit, the second negative pressure driving unit, the third negative pressure driving unit, and the main control module, respectively.

9. A signal-compatible vacuum cleaner control device, characterized in that, Includes a signal-compatible vacuum cleaner control circuit as described in any one of claims 1 to 8.

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