A fan control circuit and a fan
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-11
- Publication Date
- 2026-08-14
AI Technical Summary
[0003]然而，尽管现有风扇在摆头功能上实现了较为成熟的技术应用，但仍存在明显的使用局限性
[0014]本实用新型提供了一种风扇控制电路及风扇，通过红外检测电路与主控制电路配合，能自动检测角度变化，精准调整风扇摆头方向，实现自动追踪送风，解决传统风扇送风不精准的问题；触摸按键电路便于用户输入控制指令，方便用户调节风速、切换模式从而提升了操作便捷性，风扇驱动控制电路用于控制扇叶运转，摇头电机驱动控制电路则分别驱动水平步进电机与垂直步进电机，实现风扇上下左右精准摆动送风。该控制电路不仅提升了风扇在摆动过程中的方向控制精度和稳定性，还增强了人机交互体验，实现多档风速调节与大范围灵活摆头，全方位满足用户多样化需求。
Smart Images
Figure CN224634771U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of household appliance technology, specifically to a fan control circuit and a fan. Background Technology
[0002] As people's living standards improve, household appliances are playing an increasingly important role in daily life. Fans, as one of the basic and widely used household appliances, provide users with a convenient and energy-saving way to cool down in the high temperatures of summer. In recent years, most mainstream electric fans on the market have automatic up-down and left-right oscillation functions. Through mechanical structures or motor control, the fan outlet is made to oscillate periodically within a certain angle range, thereby expanding the air delivery coverage area and improving user comfort.
[0003] However, despite the relatively mature technology applied to oscillation functions in existing fans, significant limitations remain. Most current fans' automatic oscillation function can only oscillate periodically within a preset angle range, unable to dynamically adjust based on the user's actual position. When the user makes minor positional adjustments (such as moving the chair or changing lying posture), the fan outlet may deviate from the user's location, resulting in weakened or even non-existent airflow. In this case, the user must manually adjust the fan's position or direction to regain the desired airflow experience, a process that is not only cumbersome but also reduces the product's intelligence and user-friendliness. Utility Model Content
[0004] To address the shortcomings and deficiencies of existing technologies, this invention provides a fan control circuit and fan that improves the directional control accuracy and stability of the fan during oscillation.
[0005] To achieve the above objectives, the present invention provides a fan control circuit and a fan. The control circuit includes a main control circuit, an infrared detection circuit for detecting the fan's rotation angle, a touch button circuit for inputting control commands, a power supply circuit, a fan drive control circuit for controlling the fan blade rotation, and an oscillating motor drive control circuit for driving the fan to oscillate up and down and left and right. The output terminal of the infrared detection circuit is electrically connected to the input terminal of the main control circuit, the output terminal of the touch button circuit is electrically connected to the input terminal of the main control circuit, the output terminal of the main control circuit is electrically connected to the input terminal of the fan drive control circuit, and the output terminal of the main control circuit is electrically connected to the input terminal of the oscillating motor drive control circuit. The output terminal of the oscillating motor drive control circuit is connected to a horizontal stepper motor and a vertical stepper motor. The power supply circuit is electrically connected to the main control circuit.
[0006] Further, the main control circuit includes a main control chip and a first capacitor; one end of the first capacitor is grounded, and the other end is electrically connected to the eighth pin of the main control chip; the ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, and sixteenth pins of the main control chip are all electrically connected to the oscillating motor drive control circuit; the sixth and seventh pins of the main control chip are both electrically connected to the fan drive control circuit; the twenty-second, twenty-third, twenty-fourth, twenty-fifth, and twenty-sixth pins of the main control chip are all electrically connected to the touch button circuit; the twentieth pin of the main control chip is grounded, and the second pin of the main control chip is electrically connected to the infrared detection circuit.
[0007] Furthermore, the infrared detection circuit includes an infrared remote controller, a second capacitor, a third capacitor, a first resistor, a second resistor, a third resistor, and a first diode; the first resistor, the second resistor, and the first diode are connected in series, with one end grounded and the other end electrically connected to the first pin of the infrared remote controller; one end of the third resistor is electrically connected to the first resistor and the other end is electrically connected to the second pin of the main control chip; one end of the second capacitor is electrically connected to the third resistor and the other end is electrically connected to the first diode; one end of the third capacitor is electrically connected to the second resistor and the other end is electrically connected to the first diode; the third pin of the infrared remote controller is electrically connected to the third capacitor, and the second pin of the infrared remote controller is electrically connected to the second capacitor.
[0008] Further; the oscillating motor drive control circuit includes a Darlington transistor, a fourth capacitor, a fourth resistor, a fifth resistor, a first transistor, a second diode, a first interface, and a second interface; the first pin of the Darlington transistor is electrically connected to the ninth pin of the main control chip, the second pin of the Darlington transistor is electrically connected to the tenth pin of the main control chip, the third pin of the Darlington transistor is electrically connected to the eleventh pin of the main control chip; the fourth pin of the Darlington transistor is electrically connected to the twelfth pin of the main control chip, the fifth pin of the Darlington transistor is electrically connected to the thirteenth pin of the main control chip; the sixth pin of the Darlington transistor is electrically connected to the fourteenth pin of the main control chip, and the seventh pin of the Darlington transistor is electrically connected to the fifteenth pin of the main control chip; the fourth capacitor and the second diode are connected in parallel, one end of which is electrically connected to the eighth pin of the Darlington transistor, and the other end of which is electrically connected to the ninth pin of the Darlington transistor; the fourth resistor and the fifth resistor are connected in series, one end of which is connected to the... The second diode is electrically connected, and its other end is electrically connected to the fifteenth pin of the main control chip. The eighth pin of the Darlington transistor is grounded. The emitter of the first transistor is electrically connected to the fifth resistor, the base of the first transistor is electrically connected to the fourth resistor, and the collector of the first transistor is electrically connected to the first pin of the second interface. The second pin of the second interface is electrically connected to the tenth pin of the Darlington transistor, the third pin of the second interface is electrically connected to the eleventh pin of the Darlington transistor, and the fourth pin of the second interface is electrically connected to the twelfth pin of the Darlington transistor. The second interface is electrically connected to the horizontal stepper motor. The first pin of the first interface is electrically connected to the thirteenth pin of the Darlington transistor, the second pin of the first interface is electrically connected to the fourteenth pin of the Darlington transistor, the third pin of the first interface is electrically connected to the fifteenth pin of the Darlington transistor, and the fourth pin of the first interface is electrically connected to the sixteenth pin of the Darlington transistor. The second interface is electrically connected to the vertical stepper motor.
[0009] Furthermore, the fan drive control circuit includes a second transistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a third diode, a MOSFET, and a third interface; the sixth, seventh, and eighth resistors are connected in series, with one end electrically connected to the first pin of the third interface and the other end electrically connected to the sixth pin of the main control chip; the common terminal of the seventh and eighth resistors is grounded; the base of the second transistor is connected to the common terminal of the sixth and seventh resistors, the emitter of the second transistor is electrically connected to the seventh resistor, and one end of the ninth resistor is connected to the... The first pin of the third interface is electrically connected, and the other end is electrically connected to the seventh pin of the main control chip; the second pin of the third interface is grounded; one end of the second diode is electrically connected to the second pin of the third interface, and the other end is electrically connected to the drain of the MOS transistor; the third pin of the third interface is connected to the drain of the MOS transistor; the tenth resistor and the eleventh resistor are connected in series, one end of which is electrically connected to the source of the MOS transistor, and the other end is electrically connected to the collector of the second transistor; the gate of the MOS transistor is connected to the common terminal of the tenth resistor and the eleventh resistor; the third interface is electrically connected to a drive motor.
[0010] Furthermore, the fan control circuit also includes a temperature detection circuit for detecting ambient temperature and a display and drive circuit for displaying temperature and wind speed. The temperature detection circuit is electrically connected to the seventeenth pin of the main control chip, and the display and drive circuit is electrically connected to the third and fourth pins of the main control chip.
[0011] Furthermore, the fan control circuit also includes an alarm circuit, which is electrically connected to the first pin of the main control chip. The alarm circuit includes a buzzer and a twelfth resistor. One end of the twelfth resistor is electrically connected to the positive terminal of the buzzer, and the other end is electrically connected to the first pin of the main control chip. The negative terminal of the buzzer is grounded.
[0012] This utility model also provides a fan, including the fan control circuit described above.
[0013] The beneficial effects of this utility model are:
[0014] This invention provides a fan control circuit and a fan. Through an infrared detection circuit working in conjunction with the main control circuit, it can automatically detect angle changes and precisely adjust the fan's oscillation direction, achieving automatic tracking and airflow delivery, thus solving the problem of inaccurate airflow delivery in traditional fans. The touch button circuit facilitates user input of control commands, allowing for convenient adjustment of wind speed and switching modes, thereby improving operational ease of use. The fan drive control circuit controls the fan blade rotation, while the oscillation motor drive control circuit drives the horizontal and vertical stepper motors respectively, enabling precise up-down, left-right, and right-side oscillation of the fan for airflow delivery. This control circuit not only improves the directional control accuracy and stability of the fan during oscillation but also enhances the human-computer interaction experience, enabling multi-speed adjustment and a wide range of flexible oscillation, comprehensively meeting diverse user needs. Attached Figure Description
[0015] Figure 1 This is a schematic block diagram of a fan control circuit according to the present invention.
[0016] Figure 2 This is a circuit diagram of the main control circuit in a fan control circuit according to the present invention.
[0017] Figure 3 This is a circuit diagram of an infrared detection circuit in a fan control circuit according to the present invention.
[0018] Figure 4 This is a circuit diagram of a touch button circuit in a fan control circuit according to the present invention.
[0019] Figure 5 This is a circuit diagram of the oscillating motor drive control circuit in a fan control circuit according to the present invention.
[0020] Figure 6 This is a circuit diagram of a fan drive control circuit in a fan control circuit according to the present invention.
[0021] Figure 7 This is a circuit diagram of the power supply circuit in a fan control circuit according to the present invention.
[0022] Figure 8 This is a circuit diagram of the display and drive circuit in a fan control circuit according to the present invention.
[0023] Figure 9 This is a circuit diagram of a temperature detection circuit in a fan control circuit according to the present invention.
[0024] Figure 10 This is a circuit diagram of the alarm circuit in a fan control circuit according to the present invention. Detailed Implementation
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0027] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.
[0028] This utility model proposes a fan control circuit and a fan.
[0029] In the embodiments of this utility model, such as Figure 1-10 As shown, this fan control circuit includes a main control circuit, an infrared detection circuit for detecting the fan's rotation angle, a touch button circuit for inputting control commands, a power supply circuit, a fan drive control circuit for controlling the fan blades' rotation, and an oscillating motor drive control circuit for driving the fan to oscillate up and down and left and right. The output terminal of the infrared detection circuit is electrically connected to the input terminal of the main control circuit, the output terminal of the touch button circuit is electrically connected to the input terminal of the main control circuit, the output terminal of the main control circuit is electrically connected to the input terminal of the fan drive control circuit, and the output terminal of the main control circuit is electrically connected to the input terminal of the oscillating motor drive control circuit. The output terminal of the oscillating motor drive control circuit is connected to a horizontal stepper motor and a vertical stepper motor. The power supply circuit is electrically connected to the main control circuit.
[0030] In this embodiment, the main control circuit includes a main control chip and a first capacitor; one end of the first capacitor is grounded, and the other end is electrically connected to the eighth pin of the main control chip; the ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, and sixteenth pins of the main control chip are all electrically connected to the oscillating motor drive control circuit; the sixth and seventh pins of the main control chip are both electrically connected to the fan drive control circuit; the twenty-second, twenty-third, twenty-fourth, twenty-fifth, and twenty-sixth pins of the main control chip are all electrically connected to the touch button circuit; the twentieth pin of the main control chip is grounded, and the second pin of the main control chip is electrically connected to the infrared detection circuit.
[0031] In this embodiment, the infrared detection circuit includes an infrared remote controller, a second capacitor, a third capacitor, a first resistor, a second resistor, a third resistor, and a first diode. The first resistor, the second resistor, and the first diode are connected in series, with one end grounded and the other end electrically connected to the first pin of the infrared remote controller. One end of the third resistor is electrically connected to the first resistor, and the other end is electrically connected to the second pin of the main control chip. One end of the second capacitor is electrically connected to the third resistor, and the other end is electrically connected to the first diode. One end of the third capacitor is electrically connected to the second resistor, and the other end is electrically connected to the first diode. The third pin of the infrared remote controller is electrically connected to the third capacitor, and the second pin of the infrared remote controller is electrically connected to the second capacitor.
[0032] In this embodiment, the oscillating motor drive control circuit includes a Darlington transistor, a fourth capacitor, a fourth resistor, a fifth resistor, a first transistor, a second diode, a first interface, and a second interface. The first pin of the Darlington transistor is electrically connected to the ninth pin of the main control chip; the second pin of the Darlington transistor is electrically connected to the tenth pin of the main control chip; the third pin of the Darlington transistor is electrically connected to the eleventh pin of the main control chip; the fourth pin of the Darlington transistor is electrically connected to the twelfth pin of the main control chip; the fifth pin of the Darlington transistor is electrically connected to the thirteenth pin of the main control chip; the sixth pin of the Darlington transistor is electrically connected to the fourteenth pin of the main control chip; and the seventh pin of the Darlington transistor is electrically connected to the fifteenth pin of the main control chip. The fourth capacitor and the second diode are connected in parallel, with one end electrically connected to the eighth pin of the Darlington transistor and the other end electrically connected to the ninth pin of the Darlington transistor. The fourth resistor and the fifth resistor are connected in series, with one end connected to the... The second diode is electrically connected at one end, and the other end is electrically connected to the fifteenth pin of the main control chip. The eighth pin of the Darlington transistor is grounded. The emitter of the first transistor is electrically connected to the fifth resistor, the base of the first transistor is electrically connected to the fourth resistor, and the collector of the first transistor is electrically connected to the first pin of the second interface. The second pin of the second interface is electrically connected to the tenth pin of the Darlington transistor, the third pin of the second interface is electrically connected to the eleventh pin of the Darlington transistor, and the fourth pin of the second interface is electrically connected to the twelfth pin of the Darlington transistor. The second interface is electrically connected to the horizontal stepper motor. The first pin of the first interface is electrically connected to the thirteenth pin of the Darlington transistor, the second pin of the first interface is electrically connected to the fourteenth pin of the Darlington transistor, the third pin of the first interface is electrically connected to the fifteenth pin of the Darlington transistor, and the fourth pin of the first interface is electrically connected to the sixteenth pin of the Darlington transistor. The second interface is electrically connected to the vertical stepper motor.
[0033] In this embodiment, the fan drive control circuit includes a second transistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a third diode, a MOSFET, and a third interface. The sixth, seventh, and eighth resistors are connected in series, with one end electrically connected to the first pin of the third interface and the other end electrically connected to the sixth pin of the main control chip. The common terminal of the seventh and eighth resistors is grounded. The base of the second transistor is connected to the common terminal of the sixth and seventh resistors, and the emitter of the second transistor is electrically connected to the seventh resistor. One end of the ninth resistor is connected to the... The first pin of the third interface is electrically connected, and the other end is electrically connected to the seventh pin of the main control chip; the second pin of the third interface is grounded; one end of the second diode is electrically connected to the second pin of the third interface, and the other end is electrically connected to the drain of the MOS transistor; the third pin of the third interface is connected to the drain of the MOS transistor; the tenth resistor and the eleventh resistor are connected in series, one end of which is electrically connected to the source of the MOS transistor, and the other end is electrically connected to the collector of the second transistor; the gate of the MOS transistor is connected to the common terminal of the tenth resistor and the eleventh resistor; and the third interface is electrically connected to a drive motor.
[0034] In this embodiment, the fan control circuit further includes a temperature detection circuit for detecting ambient temperature and a display and drive circuit for displaying temperature and wind speed. The temperature detection circuit is electrically connected to the seventeenth pin of the main control chip, and the display and drive circuit is electrically connected to the third and fourth pins of the main control chip.
[0035] In this embodiment, the fan control circuit further includes an alarm circuit, which is electrically connected to the first pin of the main control chip. The alarm circuit includes a buzzer and a twelfth resistor. One end of the twelfth resistor is electrically connected to the positive terminal of the buzzer, and the other end is electrically connected to the first pin of the main control chip. The negative terminal of the buzzer is grounded.
[0036] This utility model also provides a fan, including the fan control circuit described above.
[0037] Specifically, the fan control circuit provided in this application has a reasonable structure and high control precision. Through the integrated infrared detection circuit, it can detect the fan's rotation angle in real time, achieving precise feedback on the fan's oscillation position. The touch button circuit facilitates user input of control commands, improving operational convenience. The main control circuit coordinates the work of each module, realizing intelligent regulation of the fan's operating status. The fan drive control circuit controls the fan blade rotation, while the oscillating motor drive control circuit drives the horizontal and vertical stepper motors respectively, achieving precise up-down and left-right oscillation of the fan for air delivery. The power supply circuit provides stable power support for the entire control system.
[0038] To enable consumers to fully experience the convenience of this product, this application uses a oscillating motor drive control circuit to drive the horizontal and vertical stepper motors to rotate, thereby achieving the automatic oscillation function of the fan in all directions. Simultaneously, the touch button circuit allows for touch input in four directions: left, right, up, and down.
[0039] When a user feels that the fan's maximum airflow direction is not directly facing them, there is no need to manually move the entire unit. The user can remotely control the airflow direction using the "left," "right," "up," and "down" buttons via a touch-sensitive button circuit.
[0040] In actual use, when a user presses a directional key in the touch button circuit, the main control chip receives the corresponding signal, analyzes the signal, and drives the corresponding horizontal and vertical stepper motors to run, thereby causing the fan to adjust the air outlet direction to the left, right, up, or down, ultimately making the air outlet of the circulating fan accurately face the user, improving the comfort and convenience of use.
[0041] This application not only improves the directional control accuracy and stability of the fan during oscillation, but also enhances the human-computer interaction experience, providing a hardware foundation for subsequent functions such as automatic user tracking or intelligent directional air delivery, and has good application prospects and market promotion value.
[0042] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A fan control circuit, characterized by, The control circuit includes a main control circuit, an infrared detection circuit for detecting the fan rotation angle, a touch button circuit for inputting control commands, a power supply circuit, a fan drive control circuit for controlling the fan blade rotation, and an oscillating motor drive control circuit for driving the fan to oscillate up and down and left and right. The output terminal of the infrared detection circuit is electrically connected to the input terminal of the main control circuit. The output terminal of the touch button circuit is electrically connected to the input terminal of the main control circuit. The output terminal of the main control circuit is electrically connected to the input terminal of the fan drive control circuit. The output terminal of the main control circuit is electrically connected to the input terminal of the oscillating motor drive control circuit. The output terminal of the oscillating motor drive control circuit is connected to a horizontal stepper motor and a vertical stepper motor. The power supply circuit is electrically connected to the main control circuit.
2. A fan control circuit as claimed in claim 1, wherein The main control circuit includes a main control chip and a first capacitor; one end of the first capacitor is grounded, and the other end is electrically connected to the eighth pin of the main control chip; the ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, and sixteenth pins of the main control chip are all electrically connected to the oscillating motor drive control circuit; the sixth and seventh pins of the main control chip are both electrically connected to the fan drive control circuit; the twenty-second, twenty-third, twenty-fourth, twenty-fifth, and twenty-sixth pins of the main control chip are all electrically connected to the touch button circuit; the twentieth pin of the main control chip is grounded, and the second pin of the main control chip is electrically connected to the infrared detection circuit.
3. A fan control circuit as claimed in claim 2, wherein the control circuit is configured to determine the fan speed in response to the sensed temperature and the sensed fan speed. The infrared detection circuit includes an infrared remote controller, a second capacitor, a third capacitor, a first resistor, a second resistor, a third resistor, and a first diode. The first resistor, the second resistor, and the first diode are connected in series, with one end grounded and the other end electrically connected to the first pin of the infrared remote controller. One end of the third resistor is electrically connected to the first resistor, and the other end is electrically connected to the second pin of the main control chip. One end of the second capacitor is electrically connected to the third resistor, and the other end is electrically connected to the first diode. One end of the third capacitor is electrically connected to the second resistor, and the other end is electrically connected to the first diode. The third pin of the infrared remote controller is electrically connected to the third capacitor, and the second pin of the infrared remote controller is electrically connected to the second capacitor.
4. A fan control circuit as claimed in claim 3, wherein the control circuit is configured to determine the frequency of the PWM signal in response to the sensed temperature. The oscillating motor drive control circuit includes a Darlington transistor, a fourth capacitor, a fourth resistor, a fifth resistor, a first transistor, a second diode, a first interface, and a second interface. The first pin of the Darlington transistor is electrically connected to the ninth pin of the main control chip; the second pin of the Darlington transistor is electrically connected to the tenth pin of the main control chip; the third pin of the Darlington transistor is electrically connected to the eleventh pin of the main control chip; the fourth pin of the Darlington transistor is electrically connected to the twelfth pin of the main control chip; the fifth pin of the Darlington transistor is electrically connected to the thirteenth pin of the main control chip; the sixth pin of the Darlington transistor is electrically connected to the fourteenth pin of the main control chip; and the seventh pin of the Darlington transistor is electrically connected to the fifteenth pin of the main control chip. The fourth capacitor and the second diode are connected in parallel, with one end electrically connected to the eighth pin of the Darlington transistor and the other end electrically connected to the ninth pin of the Darlington transistor. The fourth resistor and the fifth resistor are connected in series, with one end connected to the second... One end of the diode is electrically connected to the other end, and the other end is electrically connected to the fifteenth pin of the main control chip. The eighth pin of the Darlington transistor is grounded. The emitter of the first transistor is electrically connected to the fifth resistor, the base of the first transistor is electrically connected to the fourth resistor, and the collector of the first transistor is electrically connected to the first pin of the second interface. The second pin of the second interface is electrically connected to the tenth pin of the Darlington transistor, the third pin of the second interface is electrically connected to the eleventh pin of the Darlington transistor, and the fourth pin of the second interface is electrically connected to the twelfth pin of the Darlington transistor. The second interface is electrically connected to the horizontal stepper motor. The first pin of the first interface is electrically connected to the thirteenth pin of the Darlington transistor, the second pin of the first interface is electrically connected to the fourteenth pin of the Darlington transistor, the third pin of the first interface is electrically connected to the fifteenth pin of the Darlington transistor, and the fourth pin of the first interface is electrically connected to the sixteenth pin of the Darlington transistor. The second interface is electrically connected to the vertical stepper motor.
5. A fan control circuit as described in claim 4, characterized in that, The fan drive control circuit includes a second transistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a third diode, a MOSFET, and a third interface. The sixth, seventh, and eighth resistors are connected in series, with one end electrically connected to the first pin of the third interface and the other end electrically connected to the sixth pin of the main control chip. The common terminal of the seventh and eighth resistors is grounded. The base of the second transistor is connected to the common terminal of the sixth and seventh resistors, and the emitter of the second transistor is electrically connected to the seventh resistor. One end of the ninth resistor is connected to the third interface. The first pin of the interface is electrically connected, and the other end is electrically connected to the seventh pin of the main control chip; the second pin of the third interface is grounded; one end of the second diode is electrically connected to the second pin of the third interface, and the other end is electrically connected to the drain of the MOS transistor; the third pin of the third interface is connected to the drain of the MOS transistor; the tenth resistor and the eleventh resistor are connected in series, one end of which is electrically connected to the source of the MOS transistor, and the other end is electrically connected to the collector of the second transistor; the gate of the MOS transistor is connected to the common terminal of the tenth resistor and the eleventh resistor; the third interface is electrically connected to a drive motor.
6. A fan control circuit as claimed in claim 5, wherein the control circuit is arranged to apply the first voltage to the fan motor when the fan motor is not running and to apply the second voltage to the fan motor when the fan motor is running. The fan control circuit also includes a temperature detection circuit for detecting ambient temperature and a display and drive circuit for displaying temperature and wind speed. The temperature detection circuit is electrically connected to the seventeenth pin of the main control chip, and the display and drive circuit is electrically connected to the third and fourth pins of the main control chip.
7. A fan control circuit as described in claim 6, characterized in that, The fan control circuit also includes an alarm circuit, which is electrically connected to the first pin of the main control chip. The alarm circuit includes a buzzer and a twelfth resistor. One end of the twelfth resistor is electrically connected to the positive terminal of the buzzer, and the other end is electrically connected to the first pin of the main control chip. The negative terminal of the buzzer is grounded.
8. A fan, characterized by Includes the fan control circuit as described in any one of claims 1-7.