Motor drive circuit and fan device

Abstract

The application relates to a motor driving circuit and a fan device, the circuit comprising: a lithium battery module for providing a power supply voltage; an input detection module, an input end of which is connected to an output end of the lithium battery module; a motor driving module, an output end of which is used for connecting a driving motor; a voltage output control module, a voltage input end of which is connected to the output end of the lithium battery module, an input detection end of which is connected to the output end of the input detection module, and a voltage output end of which is connected to the input end of the motor driving module; and the voltage output control module is used for outputting a driving voltage suitable for driving the motor through the input detection module and the motor driving module, the driving voltage being matched with the detection voltage input by the input detection module and the power supply voltage.

Description

Technical Field

[0001] This application relates to the field of motor drive technology, and in particular to a motor drive circuit and a fan device. Background Technology

[0002] Fans are an essential product in people's lives and are widely used in various places. Traditional fan equipment mainly uses AC motor drive systems, which require a fixed power supply circuit, severely limiting their application scenarios. With the development of electronic technology, DC motors have gradually been applied to the fan field, especially the emergence of brushless DC motors. These motors replace the traditional brush structure with electronic commutators, which to some extent improves the problem of the single power supply system and enhances the safety of use.

[0003] In portable power applications, Dewalt batteries, as a widely used high-performance power source, provide standard power output for various power tools, achieving a good balance between power and portability. However, the voltage and current characteristics of these batteries present a matching problem with traditional fan motor systems. In addition, in traditional technology, the battery supply system for fan equipment often uses proprietary specifications, and there is a lack of compatibility between battery packs of different brands and models. Users must purchase matching batteries to use them, which greatly limits their choices.

[0004] Therefore, there is an urgent need to provide a universal drive circuit for fan motor systems that can be adapted to various portable power supplies. Utility Model Content

[0005] Based on this, the purpose of this application is to at least solve one of the above-mentioned technical defects, especially the technical defect of low battery versatility in the prior art of fan devices. This application provides a motor drive circuit and a fan device.

[0006] In a first aspect, this application provides a motor drive circuit for use in a fan device having a drive motor, the circuit comprising: The lithium battery module is used to provide power voltage; The input detection module is connected to the output of the lithium battery module. The motor drive module has an output terminal for connecting to the drive motor. The voltage output control module has a voltage input terminal connected to the output terminal of the lithium battery module, an input detection terminal connected to the output terminal of the input detection module, and a voltage output terminal connected to the input terminal of the motor drive module. The voltage output control module is used to output a drive voltage adapted to the drive motor by passing a detection voltage that matches the power supply voltage input through the input detection module and passing it through the motor drive module.

[0007] In one embodiment, the circuit further includes: The adapter module has an input terminal for connecting to an external power source. First voltage conversion module; The input terminal of the first voltage conversion module is connected to the output terminal of the adapter module and the output terminal of the lithium battery module, respectively. The output of the first voltage conversion module is connected to the input of the input detection module and the voltage input of the voltage output control module, respectively.

[0008] In one embodiment, the circuit further includes: The voltage stabilization module has its first end connected to the output of the lithium battery module, and its second end connected to the output of the adapter module and the input of the first voltage conversion module.

[0009] In one embodiment, the circuit further includes: The second voltage conversion module has a first end connected to the output end of the first voltage conversion module, and a second end used to connect to an external terminal device. The second voltage conversion module is used to charge external terminal devices.

[0010] In one embodiment, the circuit further includes: The output detection module has its input terminal connected to the output terminal of the motor drive module, and its output terminal connected to the output detection terminal of the voltage output control module.

[0011] In one embodiment, the circuit further includes: The motor status feedback module has one end connected to the power supply circuit of the drive motor, and the other end connected to the status detection terminal of the voltage output control module.

[0012] In one embodiment, the circuit further includes: The speed control switch module has a potential sliding terminal used for the linkage mechanism of the mechanically connected switch operating component, and multiple potential output terminals are respectively connected to multiple speed control switch terminals of the voltage output control module.

[0013] In one embodiment, the voltage output control module includes multiple voltage output terminals that output different phase voltages; the motor drive module includes: Multiple phase voltage output modules, each with its input terminal connected to a different voltage output terminal; the output terminals of each phase voltage output module are used to connect to the drive motor. Each phase voltage output module is used to output different phase voltages.

[0014] In one embodiment, the circuit further includes: The indicator light module has its first end connected to the power output terminal of the voltage output control module, and its second end used for grounding. The indicator light module is used to display the remaining power of the lithium battery module.

[0015] Secondly, this application provides a fan device, comprising: Drive motor; The fan rotation mechanism is mechanically connected to the drive end of the drive motor and is used to rotate under the drive of the drive motor to generate turbulent airflow. As described above, the motor drive circuit is connected to the drive motor and is used to drive the drive motor.

[0016] As can be seen from the above technical solutions, the embodiments of this application have the following advantages: The motor drive circuit and fan device provided in this application can provide a power supply voltage for driving the fan motor through a lithium battery module, such as a high-performance Dewalt battery. The input detection module and voltage output control module are both connected to the output terminal of the lithium battery module. Thus, the power supply voltage from the lithium battery module can be input to both the input detection module and the voltage output control module. Through the connection between the output terminal of the input detection module and the input detection terminal of the voltage output control module, the power supply voltage detected by the input detection module can be fed back to the voltage output control module. With this structure, the voltage output control module can dynamically adjust the voltage output to the drive motor based on the detected voltage from the input detection module, ensuring a precise match between the power supply voltage and the motor's drive requirements. This improves energy conversion efficiency and adapts to different power supplies, achieving the beneficial effects of improving energy conversion efficiency, enabling the drive motor to adapt to different power supplies, and solving the problem of matching battery and motor parameters. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a motor drive circuit provided in an embodiment of this application; Figure 2 A schematic diagram of a motor drive circuit with an adapter module provided in an embodiment of this application; Figure 3 A schematic diagram of a motor drive circuit with a second voltage conversion module provided in an embodiment of this application; Figure 4 A schematic diagram of a motor drive circuit with output feedback provided in an embodiment of this application; Figure 5 A schematic diagram of the voltage input conversion circuit module of a motor drive circuit provided in an embodiment of this application; Figure 6 This is a schematic diagram of the core control circuit module of a motor drive circuit provided in an embodiment of this application; Figure 7 A schematic diagram illustrating a specific example of a motor drive module provided in this application embodiment; Figure 8 A schematic diagram of the structure of a monitoring and feedback circuit module for a motor drive circuit provided in an embodiment of this application; Figure 9 A schematic diagram of the circuit for user interaction and extended functions.

[0019] Figure label: 12-Motor drive circuit; 110-Lithium battery module; 120-Input detection module; 130-Voltage output control module; 140-Motor drive module; 150-Adapter module; 160-First voltage conversion module; 170-Voltage stabilization module; 180-Second voltage conversion module; 190-Output detection module; 210-Motor status feedback module; 220-Speed ​​control switch module; 230-Indicator light module; 240-Programming module; 310-Drive motor; 320-External power supply; 330-External terminal device. Detailed Implementation

[0020] 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, and 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.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0022] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0023] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0024] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0025] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0026] In existing technologies, early fan devices relied on AC motor drives, requiring fixed power supply circuits and limiting their application environments. With the development of DC motors, brushless DC motors have improved safety through electronic commutators, but battery brands and models lack universal compatibility, requiring users to use dedicated battery packs. For example, if a user has multiple Dewalt battery models, existing fan devices cannot be directly compatible, leading to wasted battery resources and inconvenience.

[0027] Based on this, this application provides a motor drive circuit and a fan device. Through the structural arrangement of the lithium battery module, input detection module, voltage output control module and the voltage output control module, it can be compatible with a variety of high-performance lithium batteries of different models, thereby improving the versatility and scalability between the battery pack and the fan device.

[0028] In one exemplary embodiment, Figure 1 This is a schematic diagram of a motor drive circuit provided in an embodiment of this application, as shown below. Figure 1 As shown, this application provides a motor drive circuit 12, which is applied to a fan device with a drive motor. The circuit includes: The lithium battery module 110 is used to provide power supply voltage.

[0029] The lithium battery module 110 refers to a unit that provides working power, specifically a Dewalt battery or other compatible lithium battery, with an output voltage range of, for example, 18V to 20V, to provide basic power to the system.

[0030] For example, the lithium battery module 110 can be a power module disposed in the motor drive circuit 12, and the lithium battery module 110 can be charged by an external power source. The voltage output by the lithium battery module 110 can be converted to obtain the operating voltage of each module included in the motor drive circuit 12.

[0031] The input detection module 120 is connected to the output of the lithium battery module 110.

[0032] The input detection module 120 can refer to a circuit used to monitor the power supply voltage. For example, it can be formed by combining a voltage divider resistor with an analog-to-digital converter to convert the lithium battery output voltage into a recognizable detection signal. It can be understood that "input detection" refers to the detection before the input to the voltage output control.

[0033] For example, the input terminal of the input detection module 120 is connected to the output terminal of the lithium battery module 110. For instance, the input detection module 120 can be connected to the output terminal of the lithium battery module 110 through an intermediary module, which can be a voltage conversion module. The input detection module 120 is used to input the converted power supply voltage to detect the voltage output by the lithium battery module 110.

[0034] The motor drive module 140 has an output terminal for connecting to the drive motor 310.

[0035] The motor drive module 140 can refer to a module that converts the adjusted voltage into a motor drive signal. For example, a three-phase full-bridge drive circuit can be used to output voltages of different phases to drive the brushless DC motor.

[0036] For example, the output terminal of the motor drive module 140 is used to connect to the drive motor 310, and can output voltages of different phases to the drive motor 310 to make the drive motor 310 run. By driving the fan rotation mechanism mechanically connected to it, fan airflow is generated, thus enabling the fan to work.

[0037] The voltage output control module 130 has its voltage input terminal connected to the output terminal of the lithium battery module 110, its input detection terminal connected to the output terminal of the input detection module 120, and its voltage output terminal connected to the input terminal of the motor drive module 140.

[0038] The voltage output control module 130 is used to output a drive voltage adapted to the drive motor 310 via the motor drive module 140, based on the detection voltage input through the input detection module 120 that matches the power supply voltage.

[0039] The voltage output control module 130 can refer to a unit that adjusts the output voltage based on the detection signal. For example, it can specifically employ an adjustable DC-DC converter circuit, adjusting the output voltage value through feedback control to match the rated voltage of the drive motor 310. The voltage output control module 130 can also be a module containing an MCU (Microcontroller Unit).

[0040] For example, the voltage input terminal of the voltage output control module 130 can be connected to the output terminal of the lithium battery module 110, so that the input detection terminal can be connected to the output terminal of the input detection module 120 and the voltage output terminal can be connected to the input terminal of the motor drive module 140.

[0041] Specifically, when the lithium battery module 110 is connected to the circuit, the input detection module 120 monitors its output voltage in real time. The voltage output control module 130 can dynamically adjust the voltage output to the motor drive module 140 based on the detected voltage value. For example, if the detected lithium battery output voltage is 20V, while the rated operating voltage of the drive motor 310 is 12V, the voltage output control module 130 can adjust the output voltage to 12V. The motor drive module 140 receives the adjusted voltage and can generate a three-phase drive signal to drive the motor 310 to operate, thus enabling the fan to generate stable airflow. Therefore, different types of lithium batteries can be made compatible through dynamic voltage adjustment.

[0042] Optionally, compared to existing technologies, traditional solutions require dedicated battery packs and cannot be adapted to multiple power supply models. This embodiment, through the application of the voltage output control module 130, achieves parameter matching and thermal efficiency conversion between the lithium battery module 110 and the drive motor 310, improving the stability and safety of the power supply system. Furthermore, through a voltage detection and dynamic adjustment mechanism, users can freely select multiple lithium battery models. For example, in traditional technologies, an 18V battery may require an additional step-down circuit to drive a 12V motor, while this embodiment directly achieves matching through an integrated voltage control module, reducing reliance on external circuits.

[0043] Optionally, the above structure allows for broad compatibility with various battery models, enabling users to flexibly replace lithium batteries of different brands or models. Furthermore, power supply stability and safety are improved, ensuring the motor drive voltage remains within the appropriate range and preventing equipment damage caused by overvoltage or undervoltage. Simultaneously, battery replacement is more convenient, allowing users to continue using the device simply by replacing the battery without waiting for charging.

[0044] In this embodiment, through the above structure, the voltage output control module 130 can dynamically adjust the voltage output to the drive motor 310 by the detected voltage of the input detection module 120, ensuring that the power supply voltage is accurately matched with the motor drive requirements, thereby improving energy conversion efficiency and adapting to different power supplies. This achieves the beneficial effects of improving energy conversion efficiency, enabling the drive motor 310 to adapt to different power supplies, and solving the problem of matching battery and motor parameters.

[0045] In one exemplary embodiment, Figure 2 This application provides a schematic diagram of a motor drive circuit with an adapter module, as shown in the embodiment. Figure 2 As shown, in Figure 1 Based on this, the structure of the motor drive circuit is further illustrated by an example, and the motor drive circuit also includes: The adapter module 150 has an input terminal for connecting to an external power supply 320. The adapter module 150 can refer to an interface circuit for receiving input from the external power supply 320; for example, it can be implemented using a Type-C or DC connector, and can be used to connect the external power supply 320 in parallel with the lithium battery module 110 for power supply.

[0046] First voltage conversion module 160.

[0047] The input terminal of the first voltage conversion module 160 is connected to the output terminal of the adapter module 150 and the output terminal of the lithium battery module 110, respectively.

[0048] The output terminal of the first voltage conversion module 160 is connected to the input terminal of the input detection module 120 and the voltage input terminal of the voltage output control module 130, respectively.

[0049] The first voltage conversion module 160 can be a voltage regulation module with multiple input terminals. For example, it can be implemented using a step-down DC-DC converter to convert the voltage output from the adapter module 150 or the lithium battery module 110 into the standard voltage required by the motor drive module 140. The DC-DC converter can be a circuit module containing a voltage conversion chip. The first voltage conversion module 160 can convert 24V or 20V voltage to output 12V voltage.

[0050] For example, the input terminal of the adapter module 150 is used to connect to an external power supply 320, thus enabling the fan device to operate with external power 320. The input terminal of the first voltage conversion module 160 is connected to the output terminal of the adapter module 150 and the output terminal of the lithium battery module 110, respectively. Thus, the first voltage conversion module 160 can convert the voltage output by the adapter module 150 and the voltage output by the lithium battery module 110 to obtain the operating voltage required by each module of the motor drive circuit 12. The output terminal of the first voltage conversion module 160 is connected to the input terminal of the input detection module 120 and the voltage input terminal of the voltage output control module 130, respectively, thus providing the converted voltage input to each module.

[0051] Specifically, when the external power supply 320 is connected through the adapter module 150, the input terminal of the first voltage conversion module 160 can simultaneously receive voltage inputs from both the external power supply 320 and the lithium battery module 110. At this time, the first voltage conversion module 160 can select either the adapter module 150 or the lithium battery module 110 as the main power supply based on the power voltage signal fed back by the input detection module 120, and transmit the converted stable voltage to the input detection module 120 and the voltage output control module 130. For example, when the adapter module 150 is connected to the external power supply 320, the first voltage conversion module 160 can preferentially use the external power supply 320 while keeping the lithium battery module 110 in a charging or standby state.

[0052] Optionally, this embodiment, by proposing an adapter module 150 and a first voltage conversion module 160, realizes dual-power supply switching between the external power supply 320 and the lithium battery, avoiding the defect of equipment shutdown due to battery depletion, and expanding the power supply options for the equipment. Compared with traditional technologies, this embodiment solves the problem that traditional fan equipment only supports single battery power and cannot be compatible with external power supply 320 input, thus limiting its application scenarios.

[0053] In this embodiment, the above structure allows users to freely choose between a lithium battery or an external power supply 320 according to their actual needs, improving the flexibility of device use. The connection of the external power supply 320 can extend the continuous operating time of the device, while the voltage regulation function of the first voltage conversion module 160 ensures voltage stability under different power inputs, preventing abnormal motor drive due to voltage fluctuations.

[0054] In one exemplary embodiment, such as Figure 2 As shown, the circuit may further include: The voltage stabilization module 170 has its first end connected to the output end of the lithium battery module 110, and its second end connected to the output end of the adapter module 150 and the input end of the first voltage conversion module 160, respectively.

[0055] The voltage stabilization module 170 can refer to a circuit module used to suppress voltage fluctuations between the lithium battery module 110 and the adapter module 150. For example, it can be implemented by a parallel circuit composed of a filter capacitor and a Zener diode, which absorbs transient voltage fluctuations to maintain a stable input voltage.

[0056] The first end and the second end of the voltage stabilization module 170 can refer to two electrical connection ports of the voltage stabilization module 170. For example, they can be implemented using metal contacts or soldered terminals, and current conduction between different modules can be achieved through physical contact.

[0057] For example, the first end of the voltage stabilization module 170 is connected to the output end of the lithium battery module 110, and the second end of the voltage stabilization module 170 is connected to the output end of the adapter module 150 and the input end of the first voltage conversion module 160, respectively. With this structure, the output voltage of the lithium battery module 110 and the adapter module 150 can be stabilized.

[0058] Specifically, the first terminal of the voltage stabilization module 170 can receive the output voltage from the lithium battery module 110, and the second terminal of the voltage stabilization module 170 can receive the output voltage from the adapter module 150. At this time, the voltage stabilization module 170 performs dynamic balancing of the two input voltages to eliminate instantaneous voltage differences caused by power switching. For example, when the output voltage of the lithium battery module 110 decreases due to a drop in charge, the voltage stabilization module 170 releases electrical energy through its internal energy storage element, maintaining the voltage input to the first voltage conversion module 160 within a set range. Therefore, regardless of whether the fan device is powered by a lithium battery or an external power supply 320, the motor drive module 140 can obtain a stable input voltage.

[0059] Optionally, this embodiment provides a voltage stabilization module 170, which can form a buffer isolation at the power input terminal to avoid voltage surges impacting subsequent circuits.

[0060] In this embodiment, the above-described structural solution effectively solves the voltage fluctuation problem in multi-power supply switching scenarios, ensuring that the drive motor 310 can obtain a stable input voltage under different power supply modes, thereby improving the reliability and safety of equipment operation.

[0061] In one exemplary embodiment, Figure 3 A schematic diagram of a motor drive circuit with a second voltage conversion module provided in an embodiment of this application is shown below. Figure 3 As shown, it is possible to Figure 1 , Figure 2 Based on this, the structure of the motor drive circuit is further illustrated by an example, and the motor drive circuit also includes: The second voltage conversion module 180 has a first end connected to the output end of the first voltage conversion module 160, and a second end used to connect to an external terminal device 330. The second voltage conversion module 180 is used to charge the external terminal device 330.

[0062] The second voltage conversion module 180 refers to a circuit unit that converts the voltage output by the first voltage conversion module 160 into a voltage suitable for the charging requirements of the external terminal device 330. For example, it can be implemented using a buck DC-DC converter or a boost DC-DC converter, and can be used to adjust the output voltage according to the charging voltage requirements of the external terminal device 330. As an example, the second voltage conversion module 180 can convert the 12V voltage output by the first voltage conversion module 160 into a 5V voltage.

[0063] The external terminal device 330 can refer to a portable electronic device that needs to be charged, such as a mobile phone, tablet computer or Bluetooth headset, whose charging interface can be connected to the second voltage conversion module 180 through a standard USB interface or a Type-C interface.

[0064] For example, this embodiment further proposes that the circuit also includes a second voltage conversion module 180. The first end of the second voltage conversion module 180 is connected to the output end of the first voltage conversion module 160, so that the second voltage conversion module 180 can input the output voltage converted by the first voltage conversion module 160. The second end of the second voltage conversion module 180 is used to connect to the external terminal device 330, so that the power supply voltage can be converted twice by the second voltage conversion module 180 and output a voltage that meets the charging requirements to charge the external terminal device 330.

[0065] Specifically, the output terminal of the first voltage conversion module 160 is connected to the first terminal of the second voltage conversion module 180, so that the power supply voltage of the adapter module 150 and / or the lithium battery module 110 is processed by the first voltage conversion module 160 to form an intermediate voltage and transmitted to the second voltage conversion module 180. The second voltage conversion module 180 converts the intermediate voltage into a suitable charging voltage according to the charging requirements of the external terminal device 330, and outputs it to the external terminal device 330 through its second terminal. During this process, the voltage conversion function of the second voltage conversion module 180 can operate independently of the motor drive module 140, ensuring that the charging operation of the external terminal device 330 does not interfere with the operation of the fan device.

[0066] Optionally, the structural solution further provided in this embodiment, by integrating a second voltage conversion module 180, can expand the charging capability while maintaining the fan driving function, realize power reuse, and reduce the number of devices carried by the user. Compared with the prior art, this application solves the problem that traditional fan devices only support a single power supply function and cannot use the power supply to charge other external devices, requiring users to carry additional charging equipment.

[0067] In this embodiment, the above-described structural solution solves the problem that existing fan devices are incompatible with charging external terminal devices 330, allowing users to charge other electronic devices while driving the fan, thus improving power utilization and ease of use.

[0068] In one exemplary embodiment, Figure 4 A schematic diagram of a motor drive circuit with output feedback provided in an embodiment of this application is shown below. Figure 4 As shown, it is possible to Figure 1 Based on this, the structure of the motor drive circuit is further illustrated by an example, and the motor drive circuit also includes: The output detection module 190 has its input terminal connected to the output terminal of the motor drive module 140, and its output terminal connected to the output detection terminal of the voltage output control module 130.

[0069] The output detection module 190 can refer to a circuit module used to acquire the output voltage or current parameters of the motor drive module 140 in real time. For example, it can be implemented using a voltage sensor or a current sensor, and closed-loop regulation is achieved by transmitting the detection signal to the voltage output control module 130. The output terminal of the motor drive module 140 can refer to the interface part connected to the drive motor 310. For example, it can be implemented using metal contacts or wire connections, and is used to transmit the drive voltage to the motor.

[0070] The output detection terminal of the voltage output control module 130 can refer to a communication interface for receiving external detection signals. For example, it can be implemented using an analog signal input port or a digital communication interface to receive feedback signals from the output detection module 190.

[0071] For example, this embodiment further proposes that the motor drive circuit 12 may also include an output detection module 190. The input terminal of the output detection module 190 is connected to the output terminal of the motor drive module 140, so that the output voltage / current of the motor drive module 140 can be detected in real time, that is, the voltage / current input to the drive motor 310 can be detected. The output terminal of the output detection module 190 is connected to the output detection terminal of the voltage output control module 130, so that the detected output voltage / current can be fed back to the voltage output control module 130, so that the voltage output control module 130 can monitor the status of the output signal.

[0072] Specifically, the input terminal of the output detection module 190 can be physically connected to the output terminal of the motor drive module 140 via a wire to collect the voltage or current parameters of the drive motor 310 in real time. The detection signal is transmitted to the output detection terminal of the voltage output control module 130 through the output terminal of the output detection module 190. The voltage output control module 130 can dynamically adjust the voltage value output to the motor drive module 140 based on the received signal. For example, when the drive voltage is detected to be lower than a preset threshold, the voltage output control module 130 can increase the output voltage to compensate for losses; when abnormal fluctuations in the drive voltage are detected, the voltage output control module 130 can cut off the output to protect the circuit.

[0073] In this embodiment, a closed-loop feedback is further formed by introducing an output detection module 190, which enables the voltage output control module 130 to dynamically adjust the output voltage according to the actual operating conditions, thereby avoiding equipment failure caused by voltage mismatch.

[0074] In one exemplary embodiment, such as Figure 4 As shown, the circuit may further include: The motor status feedback module 210 has a first end for connecting to the power supply circuit of the drive motor 310, and a second end for connecting to the status detection terminal of the voltage output control module 130.

[0075] The motor status feedback module 210 can refer to a circuit unit used to monitor the operating status of the drive motor 310. For example, it can be implemented by using a current sensor or a voltage sensor, which reflects the motor's operating status by collecting current or voltage signals in the power supply circuit.

[0076] The status detection terminal of the voltage output control module 130 can refer to the interface in the voltage output control module 130 used to receive feedback signals. Specifically, it can be implemented using an analog-to-digital converter circuit to convert the feedback signal into a digital signal that the control module can recognize.

[0077] Specifically, the motor status feedback module 210 can collect current or voltage parameters in the power supply circuit of the drive motor 310 in real time and transmit the parameter signals to the status detection terminal of the voltage output control module 130. The voltage output control module 130 determines whether the motor is in an overload, stalled, or abnormally overheating state based on the received signal, and dynamically adjusts the voltage value output to the motor drive module 140, thereby achieving closed-loop control of the drive motor 310's operating status. For example, when the detected current exceeds a set threshold, the control module can reduce the output voltage to limit the motor power and prevent device damage.

[0078] For example, this embodiment further proposes a motor status feedback module 210. The first end of the motor status feedback module 210 can be used to connect to the power supply circuit of the drive motor 310 to collect the circuit status of the power supply circuit. The second end of the motor status feedback module 210 can be connected to the status detection end of the voltage output control module 130 to feed back the collected circuit status to the voltage output control module 130.

[0079] In this embodiment, through the above-described structural scheme, this application can monitor the motor's operating status in real time and automatically adjust the power supply parameters, effectively preventing equipment failures caused by motor overload or overheating and extending the motor's service life. Simultaneously, closed-loop control optimizes battery energy distribution, avoiding energy waste due to abnormal motor operation and improving system safety and energy efficiency.

[0080] In one exemplary embodiment, the circuit further includes: The speed control switch module has a potential sliding terminal used for the linkage mechanism of the mechanically connected switch operating component, and multiple potential output terminals are respectively connected to multiple speed control switch terminals of the voltage output control module.

[0081] The speed control switch module refers to a device that changes the output electrical signal through mechanical operation. Specifically, it can be implemented using a variable resistor or digital potentiometer with a sliding contact, converting mechanical displacement into electrical signal changes. The potentiometer sliding terminal refers to a contact terminal linked to the mechanical operating component. Specifically, it can be implemented using a structure where a metal conductive slider contacts a resistor track, changing the output voltage value by adjusting the sliding position. The linkage mechanism of the switch operating component refers to a mechanical structure that transmits the action of the operating component. Specifically, it can be implemented using a shaft, gear set, or linkage device, converting the user's rotation or pressing action into linear displacement of the potentiometer sliding terminal.

[0082] The speed control switch terminal refers to the interface for receiving speed control signals. Specifically, it can be implemented using a multi-channel voltage comparison circuit or an analog-to-digital converter circuit to identify the motor speed command corresponding to different potential values.

[0083] For example, the circuit further includes a speed control switch module. The potential sliding terminal of the speed control switch module can be used to mechanically connect the linkage mechanism of the switch operating component. In this way, different potentials can be accessed by sensing the action of the switch operating component. Multiple potential output terminals are respectively connected to multiple speed control switch terminals of the voltage output control module. Thus, when the connection between one potential output terminal and the potential sliding terminal is turned on, the electrical signal transmitted from the potential sliding terminal can be input to the voltage output control module through the corresponding speed control switch terminal to identify the required switching position of the fan equipment.

[0084] Specifically, the sliding contact of the speed control switch module is mechanically linked to the knob or push rod of the fan unit. When the user rotates the speed control knob, the linkage mechanism moves the sliding contact along the resistance track, causing multiple potential output terminals to generate stepped or continuously changing voltage signals. These voltage signals are transmitted to the speed control switch terminal of the voltage output control module, where they are processed to generate corresponding pulse width modulation waveforms, thereby adjusting the input voltage amplitude or frequency of the drive motor. For example, when the sliding contact moves to the low resistance position, a high-level signal is generated at the output terminal, and the drive motor obtains maximum power output; when the sliding contact moves to the high resistance position, a low-level signal is generated at the output terminal, and the motor enters a low-speed operation mode.

[0085] In this embodiment, the above-described structural scheme enables the synchronous control of multiple speed control signal outputs through a single mechanical operating component. This reduces circuit complexity while ensuring speed control accuracy, solving the problems of high cost and poor mechanical operation feedback in existing electronic speed control modules. This allows users to adjust the fan speed intuitively and stably.

[0086] In one exemplary embodiment, the voltage output control module includes multiple voltage output terminals that output different phase voltages; the motor drive module includes: Multiple phase voltage output modules, each with its input terminal connected to a different voltage output terminal; the output terminals of each phase voltage output module are used to connect to the drive motor. Each phase voltage output module is used to output different phase voltages.

[0087] The multiple voltage output terminals of the voltage output control module can refer to independent output ports capable of generating voltages of different phases. Specifically, this can be implemented using a multi-phase power management chip or a voltage divider circuit, generating voltage signals of different phases through time-sharing control or phase difference adjustment. The phase voltage output module refers to a circuit module that converts the input voltage into a specific phase drive signal. Specifically, this can be implemented using an H-bridge circuit, a MOSFET array, or a phase voltage chip, generating drive voltages of different phases by controlling the conduction sequence of switching elements.

[0088] Optionally, a voltage output control module is further proposed, which includes multiple voltage output terminals that output different phase voltages, so that different phase voltages can be output through different output ports; the input terminals of each phase voltage output module of the motor drive module are respectively connected to different voltage output terminals, so that different phase voltage signals can be input; the output terminals of each phase voltage output module are respectively used to connect to the drive motor, so that each phase voltage output module can be used to output different phase voltages to the drive motor to enable the drive motor to be driven by brushless DC.

[0089] Specifically, the voltage output control module can be a multi-phase power management chip that generates multiple voltage signals with fixed phase differences. For example, the three-phase voltage output terminals can each output voltage waveform with a phase difference of 120 degrees. Each phase voltage output module receives its corresponding phase voltage signal at its input terminal, and through the alternating conduction of switching elements in the H-bridge circuit, converts the DC voltage into an AC drive signal, which is then output to different windings of the drive motor. Thus, the drive motor can achieve smooth start-up and continuous operation based on the synergistic effect of the multi-phase voltages, while avoiding the torque fluctuation problems that may occur with single-phase drive.

[0090] In this embodiment, the coordinated configuration of the multi-phase voltage output terminal and the phase voltage output module enables the drive voltage to dynamically adjust its phase distribution according to changes in motor type or load, thereby improving the adaptability and energy conversion efficiency of the battery-powered system. Furthermore, through the above structural solution, this application effectively solves the phase matching problem between the battery output voltage and the motor drive requirements, reduces electromagnetic interference through a multi-phase independent drive mechanism, and is compatible with the voltage fluctuation characteristics of different battery models, ensuring that the drive motor can obtain stable torque output under different operating conditions.

[0091] In one exemplary embodiment, the circuit further includes: The indicator light module has its first end connected to the power output terminal of the voltage output control module, and its second end used for grounding. The indicator light module is used to display the remaining power of the lithium battery module.

[0092] The indicator light module refers to a visual indicator module that reflects the battery status through changes in electrical signals. Specifically, it can be implemented using multi-color LED lights, whose brightness or color changes with the battery level. The power output terminal refers to the port in the voltage output control module used to output the voltage value corresponding to the remaining battery power. This can be achieved by connecting a voltage divider resistor network to the positive terminal of the battery, proportionally converting the battery voltage into a detection signal.

[0093] For example, a motor drive circuit is further proposed, which also includes an indicator light module. The first end of the indicator light module is connected to the power output terminal of the voltage output control module, and the second end is used for grounding. In this way, the indicator light module can be used to receive the control signal from the voltage output control module and display the remaining power of the lithium battery module.

[0094] Specifically, the voltage output control module continuously monitors the output voltage of the lithium battery module through a voltage divider circuit and transmits this voltage signal to the power output terminal. The voltage value output by the power output terminal changes accordingly when the lithium battery module is in different states of charge. After receiving this voltage signal, the indicator module drives LEDs of different colors to illuminate through its built-in voltage comparison circuit. For example, when the detected voltage is higher than a set threshold, a green LED lights up to indicate sufficient power; when the voltage is lower than the threshold, a red LED flashes to indicate that charging is needed.

[0095] In some specific implementations, the power output terminal can be configured with multi-stage voltage comparators to trigger different indicator light combinations corresponding to different power ranges. The indicator light module can be integrated into the surface of the device housing, using a light guide structure to direct LED light to the visible area. Grounding connection can be achieved through the common ground wire of the circuit board, forming a complete current loop.

[0096] In this embodiment, the above-described structural scheme enables real-time visual monitoring of the remaining power of the lithium battery module. Users can directly determine the battery status through color changes, and no additional testing equipment is required when matching various Dewalt battery models. When the battery power is low, users can quickly replace it with other compatible battery packs to continue use, avoiding the limitation of traditional solutions that must rely on original manufacturer batteries.

[0097] In one exemplary embodiment, Figure 5 A schematic diagram of the voltage input conversion circuit module of a motor drive circuit provided in an embodiment of this application; Figure 6 This is a schematic diagram of the core control circuit module of a motor drive circuit provided in an embodiment of this application; Figure 7 A schematic diagram illustrating a specific example of a motor drive module provided in this application embodiment; Figure 8 A schematic diagram of the structure of a monitoring and feedback circuit module for a motor drive circuit provided in an embodiment of this application; Figure 9 A schematic diagram of the circuit for user interaction and extended functions.

[0098] like Figures 5-9 As shown, it is possible to Figures 1 to 4 Based on this, the specific structure of the motor drive circuit 12 is described by way of example. The motor drive circuit 12 may specifically include: The lithium battery module 110, adapter module 150, voltage stabilization module 170, and first voltage conversion module 160 form a voltage input conversion circuit module. The input detection module 120, voltage output control module 130, and motor drive module 140 together form the core control circuit module and the drive output module. The output detection module 190 and the motor status feedback module 210 form a monitoring and feedback circuit module; The speed control switch module 220, indicator light module 230, second voltage conversion module 180, and programming module 240 form a user interaction and extended function circuit.

[0099] Among them, 12V is the voltage output after conversion by the first voltage conversion module 160. Figures 5-7 The connection relationship between different modules can be determined by the corresponding port identifier. For example, each module is connected through the "+12V" port to realize voltage input. Similarly, the input detection module 120 and the voltage output control module 130 can be connected through the "OVP" port. The connection between other modules and the MCU contained in the voltage output control module 130 is similar, and will not be described in detail here.

[0100] For example, the lithium battery module 110 and the adapter module 150 are connected in parallel and then connected to the voltage stabilization module 170. The stabilized voltage is then delivered to the first voltage conversion module 160. The output of the first voltage conversion module 160 can be divided into three paths: one path connects to the input detection module 120, one path connects to the voltage input of the voltage output control module 130, and the other path connects to the external terminal device 330 via the second voltage conversion module 180. The output of the input detection module 120 is connected to the input detection of the voltage output control module 130. The voltage output control module 130 has multiple voltage outputs. Multiple phase voltage output modules are connected to the motor drive module 140, and the output terminals of each phase voltage output module are connected to the drive motor 310. The output terminals of the motor drive module 140 are fed back to the output detection terminal of the voltage output control module 130 through the output detection module 190. The power supply circuit of the drive motor 310 is connected to the status detection terminal of the voltage output control module 130 through the motor status feedback module 210. The potential output terminal of the speed control switch module 220 is connected to the speed control switch terminal of the voltage output control module 130. The indicator light module 230 is connected to the power output terminal of the voltage output control module 130. The fan device is connected to the fan rotation mechanism through the drive motor 310, and the motor drive circuit 12 drives the motor 310 to generate airflow.

[0101] As an example, Figures 5-9 The diagram shows some ports and connections for each module / unit, but in practical applications, other connections for the ports of each module / unit can be configured according to actual needs. Figures 5-9 The diagram shows the specific structure of each module / unit. It can be understood that, except... Figure 5 The structure shown can also be used to realize the functions of the various modules provided in this application through other structural relationships, which are not intended to limit the scope of this application. Figures 5-9 The connection structure between some pins of the chip module and other units, modules, or circuits provided in the embodiments of this application is also shown. Other pins not shown can be set according to actual conditions. Figures 5-9 The examples shown are not intended to limit this application.

[0102] In this embodiment, the voltage output control module 130 dynamically adjusts the voltage output to the drive motor 310 according to the voltage detected by the input detection module 120, ensuring that the power supply voltage is accurately matched with the motor drive requirements, thereby improving energy conversion efficiency and adapting to different power supplies. It has the advantages of improving energy conversion efficiency, adapting to different power supplies, and solving the problem of matching battery and motor parameters.

[0103] The battery and interface are designed with portability and stability in mind, allowing for quick and easy use and replacement. The interface is compatible with various Dewalt battery models, offering excellent versatility and expandability. This ease of battery replacement eliminates the need for recharging when batteries are depleted, preventing continuous use.

[0104] In one exemplary embodiment, this application provides a fan device, including: Drive motor; The fan rotation mechanism is mechanically connected to the drive end of the drive motor and is used to rotate under the drive of the drive motor to generate turbulent airflow. As described above, the motor drive circuit is connected to the drive motor and is used to drive the drive motor.

[0105] The drive motor refers to a power device that converts electrical energy into mechanical energy. Specifically, it can be implemented using a brushless DC motor, with commutation control achieved through an electronic commutator, thus avoiding the wear problems of traditional brush structures. The fan rotation mechanism refers to a mechanical component that converts rotational motion into airflow. Specifically, it can be implemented using an axial flow blade structure, with power transmission achieved through a rigid connection between the blades and the drive shaft.

[0106] For example, the fan device includes a drive motor, a fan rotation mechanism, and the aforementioned motor drive circuit. The fan rotation mechanism is mechanically connected to the drive end of the drive motor and is used to rotate under the drive of the drive motor to generate a disturbed airflow. The motor drive circuit is connected to the drive motor and is used to drive the drive motor. With this structure, the fan device can be adapted to various types of lithium batteries through the aforementioned highly versatile motor drive circuit, thereby improving the power adaptability and portability of the fan device.

[0107] Specifically, the drive motor achieves mechanical linkage with the blades of the fan rotation mechanism via a drive shaft. When the motor drive circuit receives a power signal from the lithium battery or adapter, the input detection module samples the power supply voltage and transmits the detection signal to the voltage output control module. The voltage output control module adjusts the drive voltage output to the motor drive module according to the detection signal to match the rated operating parameters of the drive motor. The motor drive module provides commutation signals to the drive motor through a multi-phase voltage output structure, causing the drive motor to rotate the blades and generate airflow. During this process, the output detection module monitors the load status of the drive motor in real time and transmits feedback signals to the voltage output control module, forming a closed-loop control.

[0108] It is understood that the fan device may have all the features of the motor drive circuit in the above embodiments. Therefore, for specific limitations of the fan device, please refer to the above limitations of the motor drive circuit, which will not be repeated here.

[0109] In this embodiment, a configurable voltage conversion and detection mechanism enables the device to adapt to lithium batteries of different voltage specifications. In existing technologies, the battery interface and motor drive system have a fixed matching structure. This solution adopts a modular circuit design, decoupling the battery interface from the drive control module, allowing users to replace different battery models without adjusting the internal structure of the device.

[0110] Through the above technical solution, this application solves the problem of forcibly binding battery models to the device's power supply system, realizing plug-and-play functionality for various battery brands. During device operation, the drive parameters can be automatically adjusted according to the voltage characteristics of the connected battery, avoiding motor overheating or efficiency degradation due to voltage mismatch. Battery replacement requires no special tools or structural modifications, significantly improving ease of use in outdoor scenarios.

[0111] The circuit described above can also be applied to various devices or similar devices that include brushless DC motors.

[0112] In the description of this specification, references to terms such as "specific embodiment," "exemplary embodiment," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0113] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, 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, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes said element.

[0114] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can be referred to each other.

[0115] 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. An electric motor drive circuit, characterized by, The circuit, applicable to a fan device with a drive motor, includes: The lithium battery module is used to provide power voltage; An input detection module is provided, with its input terminal connected to the output terminal of the lithium battery module. The motor drive module has an output terminal for connecting to the drive motor; The voltage output control module has a voltage input terminal connected to the output terminal of the lithium battery module, an input detection terminal connected to the output terminal of the input detection module, and a voltage output terminal connected to the input terminal of the motor drive module. The voltage output control module is used to output a driving voltage adapted to the drive motor through the motor drive module, based on a detection voltage that matches the power supply voltage input by the input detection module.

2. The circuit of claim 1, wherein, The circuit also includes: The adapter module has an input terminal for connecting to an external power source. First voltage conversion module; The input terminal of the first voltage conversion module is connected to the output terminal of the adapter module and the output terminal of the lithium battery module, respectively. The output terminal of the first voltage conversion module is connected to the input terminal of the input detection module and the voltage input terminal of the voltage output control module, respectively.

3. The circuit of claim 2, wherein, The circuit also includes: The voltage stabilization module has a first terminal connected to the output terminal of the lithium battery module, and a second terminal connected to the output terminal of the adapter module and the input terminal of the first voltage conversion module.

4. The circuit of claim 2, wherein, The circuit also includes: A second voltage conversion module, wherein a first end of the second voltage conversion module is connected to the output end of the first voltage conversion module, and a second end of the second voltage conversion module is used to connect to an external terminal device; The second voltage conversion module is used to charge the external terminal device.

5. The circuit of claim 1, wherein, The circuit also includes: An output detection module is provided, the input of which is connected to the output of the motor drive module, and the output of which is connected to the output detection of the voltage output control module.

6. The circuit of claim 1, wherein, The circuit also includes: The motor status feedback module has a first end for connecting to the power supply circuit of the drive motor, and a second end for connecting to the status detection terminal of the voltage output control module.

7. The circuit of claim 1, wherein, The circuit also includes: The speed control switch module has a potential sliding terminal used for mechanically connecting the linkage mechanism of the switch operation component, and multiple potential output terminals are respectively connected to multiple speed control switch terminals of the voltage output control module.

8. The circuit of claim 1, wherein, The voltage output control module includes multiple voltage output terminals that output different phase voltages; the motor drive module includes: Multiple phase voltage output modules are provided, with the input terminal of each phase voltage output module connected to a different voltage output terminal; the output terminal of each phase voltage output module is used to connect to the drive motor. Each of the phase voltage output modules is used to output different phase voltages.

9. The circuit of any one of claims 1-8, wherein, The circuit also includes: The indicator light module has its first end connected to the power output terminal of the voltage output control module, and its second end used for grounding. The indicator light module is used to display the remaining power of the lithium battery module.

10. A fan apparatus, characterized by, include: Drive motor; The fan rotation mechanism is mechanically connected to the drive end of the drive motor and is used to rotate under the drive of the drive motor to generate turbulent airflow. The motor drive circuit according to any one of claims 1-9 is connected to the drive motor and is used to drive the drive motor.

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