A window fresh air machine control circuit and window fresh air machine

Abstract

The utility model discloses a window type new fan control circuit and window type new fan, through utilizing solar power module to power supply for window type new fan control circuit, improve energy use efficiency, utilize raindrop detection module to detect whether it rains, and the controller exports control signal to motor control module and air valve control module according to the detection signal of raindrop detection module, can close the motor and air valve of window type new fan in time when it rains, avoid rainwater to enter window type new fan, and, through the control and the air valve of window opening corresponding to the opening of window, can solve the problem of poor sound insulation effect of window after installing window type new fan, improve user experience.

Description

Technical Field

[0001] This utility model relates to the field of window-type fresh air units, and in particular to a control circuit for a window-type fresh air unit and a window-type fresh air unit. Background Technology

[0002] Window-mounted fresh air systems are surface-mounted fresh air devices that can be directly installed in windows. During installation, only a piece of glass needs to be cut off for a seamless connection. There is no need to drill holes in the wall or lay pipes. This causes little damage to the building structure, has low installation costs, and is easy to install. It is suitable for already renovated houses and has great market demand and development potential.

[0003] However, on rainy days, rainwater can easily enter the window-type fresh air unit through the window, and after installing the window-type fresh air unit, the sound insulation effect of the window is reduced, affecting the user experience. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings and deficiencies of the existing technology and provide a window-type fresh air unit control circuit and a window-type fresh air unit, which can prevent rainwater from entering the window-type fresh air unit and improve the operational safety of the window-type fresh air unit.

[0005] In the first aspect, this utility model provides a window-type fresh air unit control circuit, which is applied to a window-type fresh air unit. The circuit includes a controller, a raindrop detection module, a motor control module, a damper control module, and a solar power supply module.

[0006] The solar power supply module is connected to the controller, the raindrop detection module, the motor control module, and the air valve control module respectively; the controller is connected to the raindrop detection module, the motor control module, and the air valve control module respectively; the motor control module is connected to the motor of the window-type fresh air unit, and the air valve control module is connected to the air valve of the window-type fresh air unit; the air valve is located at the opening of the window and corresponds to the opening;

[0007] The controller outputs a motor control signal to the motor control module to control the motor of the window-type fresh air unit based on the detection signal from the raindrop detection module, and outputs an air valve control signal to the air valve control module to control the air valve of the window-type fresh air unit.

[0008] Secondly, this utility model provides a window-type fresh air unit, including a motor, an air valve, and a window-type fresh air unit control circuit as described in any of the above claims; the motor is connected to a motor control module, and the air valve is connected to an air valve control module.

[0009] In this embodiment, a solar power module is used to power the control circuit of the window-type fresh air unit, improving energy efficiency. A raindrop detection module detects whether it is raining, and the controller outputs control signals to the motor control module and the air valve control module based on the detection signal from the raindrop detection module. When it rains, the motor and air valve of the window-type fresh air unit can be shut off in time to prevent rainwater from entering the window-type fresh air unit and improve its operational safety. Furthermore, by controlling the air valve to close the window opening, the problem of poor window sound insulation after installing the window-type fresh air unit can be solved, improving the user experience.

[0010] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the control circuit of a window-type fresh air unit in one embodiment of the present invention;

[0012] Figure 2 This is a circuit diagram of a raindrop detection module in one embodiment of the present invention;

[0013] Figure 3 This is a circuit diagram of a solar power supply module in one embodiment of the present invention;

[0014] Figure 4 This is a circuit diagram of the air valve control module in one embodiment of the present invention;

[0015] Figure 5 This is a circuit diagram of the motor control module in one embodiment of the present invention;

[0016] Figure 6 This is a circuit diagram of a remote control communication module in one embodiment of the present invention;

[0017] Figure 7 This is a circuit diagram of a Bluetooth communication module in one embodiment of the present invention;

[0018] Figure 8 This is a circuit diagram of a PM2.5 detection module in one embodiment of the present invention;

[0019] Figure 9 This is a structural schematic diagram of a window-type fresh air unit in one embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the present invention will be described in further detail below with reference to the accompanying drawings.

[0021] It should be understood that the described embodiments are merely some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0022] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0023] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of window-type fresh air units and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] Furthermore, in the description of this application, unless otherwise stated, "several" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0025] like Figure 1 As shown, this utility model provides a control circuit for a window-type fresh air unit, which is applied to a window-type fresh air unit. The circuit includes a controller 110, a raindrop detection module 120, a motor control module 130, a damper control module 140, and a solar power supply module 150.

[0026] The solar power module 150 is connected to the controller 110, the raindrop detection module 120, the motor control module 130, and the air valve control module 140, respectively; the controller 110 is connected to the raindrop detection module 120, the motor control module 130, and the air valve control module 140, respectively.

[0027] The motor control module 130 is connected to the motor of the window-type fresh air unit, and the air valve control module 140 is connected to the air valve of the window-type fresh air unit.

[0028] The controller 110 outputs a motor control signal to the motor control module 130 to control the motor of the window-type fresh air unit based on the detection signal of the raindrop detection module 120, and outputs an air valve control signal to the air valve control module 140 to control the air valve of the window-type fresh air unit.

[0029] The raindrop detection module 120 can use a raindrop sensor or other device with raindrop detection capabilities to detect raindrops. Specifically, when the raindrop detection module 120 detects raindrops, it sends a detection signal to the controller 110; when it does not detect raindrops, it does not send a detection signal to the controller 110. Alternatively, the raindrop detection module 120 can send different detection signals to the controller 110 depending on whether raindrops are detected, so that the controller 110 can drive whether it rains based on the detection signals.

[0030] The motor control module 130 can use existing motor control chips and motor control circuits to control the motor of the window-type fresh air unit, for example, to control the motor to turn on and off.

[0031] An air valve is installed at and corresponds to the window opening. Specifically, the size of the air valve is the same as the size of the window opening. When the air valve is closed, the window opening is sealed. By controlling the opening and closing of the air valve, the window opening can be opened and closed. The window opening can be used to draw in fresh outdoor air and expel stale indoor air, thus achieving air circulation.

[0032] By controlling the air valve to close the window opening, a window seal can be achieved, preventing increased indoor noise caused by open windows after installing a window-type fresh air unit and improving the window's sound insulation.

[0033] The damper control module 140 may include a motor and a motor drive unit. The motor drive unit drives the motor to open and close the damper. The motor drive unit may use common motor drive chips or circuits such as Darlington transistors to drive the motor. In other embodiments, the damper control module 140 may also be a chip or circuit with the same function.

[0034] The operation process of the window-type fresh air unit control circuit in this embodiment is as follows:

[0035] When the raindrop detection module 120 detects raindrops, it sends a detection signal to the controller 110. Based on the detection signal from the raindrop detection module 120, the controller 110 outputs a valve closing signal to the air valve control module 140 to control the air valve of the window-type fresh air unit to close, thereby preventing rainwater from entering the window-type fresh air unit and damaging the equipment. At the same time, the controller 110 can restore the air valve to its original state through the air valve control module 140 when the raindrop detection module 120 no longer detects raindrops. The original state refers to the previous state of the air valve. For example, if the air valve was originally open, it will be opened; if the air valve was originally closed, it will remain closed.

[0036] In this embodiment, a solar power module is used to power the control circuit of the window-type fresh air unit, improving energy efficiency. A raindrop detection module is used to detect whether it is raining. The controller outputs control signals to the motor control module and the air valve control module based on the detection signal from the raindrop detection module. When it rains, the motor and air valve of the window-type fresh air unit can be shut off in time to prevent rainwater from entering the window-type fresh air unit, thus improving the operational safety of the window-type fresh air unit. Furthermore, by controlling the air valve to close the window opening, the problem of poor window sound insulation after installing the window-type fresh air unit can be solved, improving the user experience.

[0037] like Figure 2 As shown, in one embodiment, the raindrop detection module 120 includes a raindrop sensor, a TVS tube (TVS2), a resistor (R19), an electrolytic capacitor (EC5), and a capacitor (C15).

[0038] The first end of the raindrop sensor is connected to the first end of the TVS tube TVS2, the second end of the resistor R19, the first end of the electrolytic capacitor EC5, the first end of the capacitor C15, and the controller 110. The second end of the raindrop sensor, the second end of the TVS tube TVS2, the second end of the electrolytic capacitor EC5, and the second end of the capacitor C15 are grounded.

[0039] Optionally, the rain sensor can be placed outdoors to detect whether it is raining outdoors.

[0040] When rain is detected, the rain sensor outputs a rain detection signal Rain_check to the controller 110. The controller 110 determines whether it is raining based on the rain detection signal Rain_check. When it is determined to be raining, the controller 110 controls the air valve to close through the air valve control module 140, closing the window opening to prevent rainwater from entering the window-type fresh air unit. When the rain stops, the air valve control module 140 restores the air valve to its original state. The original state refers to the previous state of the air valve. If the air valve was originally open, the controller controls the air valve to open; if the air valve was originally closed, the controller keeps it closed.

[0041] In this embodiment, an electrolytic capacitor and a capacitor are used to filter the raindrop detection signal output by the raindrop sensor, and a TVS diode is used to clamp the voltage of the raindrop detection signal output to the controller to ensure the safety of the controller.

[0042] like Figure 3 As shown, in one embodiment, the solar power module 150 includes a solar panel, a Schottky diode D1, and a thermistor RZ;

[0043] The first terminal of the Schottky diode D1 is connected to the first terminal of the solar panel, and the second terminal of the Schottky diode D1 is connected to the first terminal of the thermistor RZ. The second terminal of the thermistor RZ is used for output voltage.

[0044] Schottky diode D1 is used to prevent damage to the equipment caused by reverse connection of the power input to the solar panel.

[0045] Thermistor RZ is used to prevent equipment damage caused by surge current or short circuit in downstream circuits.

[0046] In this embodiment, Schottky diodes are used to prevent reverse connection of the power supply input to the solar panel, and thermistors are used to prevent damage to the equipment caused by surge current or short circuit in the subsequent circuit, thereby improving the operational safety of the circuit.

[0047] Optionally, the solar power module 150 further includes a Zener diode D2, an electrolytic capacitor EC1, and a capacitor C1;

[0048] The cathode of Zener diode D2 is connected to the second terminal of the thermistor RZ, the first terminal of electrolytic capacitor EC1, and the first terminal of capacitor C1, while the anode of Zener diode D2, the second terminal of electrolytic capacitor EC1, and the second terminal of capacitor C1 are grounded.

[0049] The voltage input to the solar panel is regulated by using Zener diode D2, and the voltage input is filtered by electrolytic capacitor EC1 and capacitor C1, thereby improving the reliability of the output voltage.

[0050] In one embodiment, the solar power module 150 further includes a power switching unit and a battery. The power switching unit is connected to the solar panel and the battery respectively. The power switching unit is used to switch to the battery for power output when the solar panel has no power output.

[0051] Please see Figure 3 The diagram shows a circuit of a power supply switching unit in one embodiment. The power supply switching unit includes transistors Q3-Q4, a MOSFET Q2, a Schottky diode D3, and resistors R8-R12.

[0052] The base of transistor Q3 is connected to the cathode of Schottky diode D3 through resistor R8. The anode of Schottky diode D3 is connected to the second terminal of the thermistor RZ. The collector of transistor Q3 is connected to the second terminal of the battery through resistor R9. The collector of transistor Q3 is also connected to the base of transistor Q4 through resistor R10. The emitter of transistor Q3 is grounded. The base of transistor Q4 is grounded through resistor R11. The collector of transistor Q4 is connected to the gate of MOSFET Q2 and the second terminal of resistor R12. The first terminal of resistor R12 is connected to the source of MOSFET Q2. The drain of MOSFET Q2 is connected to the cathode of Schottky diode D3. The emitter of transistor Q4 is grounded.

[0053] Switching between solar panel power and battery power is achieved using transistors Q3-Q4, MOSFET Q2, and Schottky diode D3. Specifically, when solar panel power input is detected, transistors Q3-Q4 turn off MOSFET Q2, thus disconnecting battery power. When no solar panel power input is detected, transistors Q3-Q4 turn on MOSFET Q2 to switch to battery power. Schottky diode D3 prevents reverse current flow, ensuring safe circuit operation.

[0054] Optionally, the power supply switching unit also includes: electrolytic capacitor EC3 and capacitor C5 connected in parallel at the output end of the solar power module, and electrolytic capacitor EC2 and capacitor C4 connected in parallel at the battery input end.

[0055] By using electrolytic capacitor EC3 and capacitor C5 to filter the output voltage, the stability of the input and output voltages is improved.

[0056] In one embodiment, the solar power module includes a control chip with the function of automatically tracking the maximum power point of the solar panel, and the control chip is connected to the solar panel.

[0057] Automatic tracking of the maximum power point (MPPT) of a solar panel ensures that the panel always operates at its maximum power point (voltage × current = maximum power point), thereby maximizing energy extraction. The control chip can be an MPPT chip such as CN3722 or SPV1040.

[0058] By utilizing a control chip with the function of automatically tracking the maximum power point of the solar panel, the energy output of the solar panel can be improved, thereby increasing the energy utilization rate.

[0059] like Figure 3 As shown, the solar power module 150 includes a control chip U2, a capacitor C2, resistors R1-R7, a diode D5, a Schottky diode D4, a MOSFET Q1, an inductor L1, and a diode D5.

[0060] The first terminal of control chip U2 is connected to the second terminal of the thermistor RZ through capacitor C2. The second terminal of control chip U2 is grounded. The third terminal of control chip U2 is connected to the cathode of the light-emitting diode (LED). The anode of the LED is connected to the second terminal of the thermistor RZ through resistor R1. The fourth terminal of control chip U2 is connected to the second terminal of resistor R2 and the first terminal of resistor R3. The first terminal of resistor R2 is connected to the second terminal of the thermistor RZ. The second terminal of resistor R3 is grounded. The fifth terminal of control chip U2 is grounded through resistor R4 and capacitor C3. The sixth terminal of control chip U2 is connected to the second terminal of resistor R5 and the first terminal of resistor R6. The second terminal of resistor R6 is grounded. The seventh terminal of control chip U2 is connected to the first terminal of resistor R5, the second terminal of resistor R7, and the source of MOSFET Q2. The eighth terminal of control chip U2 is connected to the second terminal of inductor L1 and the first terminal of resistor R7. The first terminal of inductor L1 is connected to the cathode of diode D5 and the cathode of Schottky diode D4. The anode of diode D5 is grounded. The anode of Schottky diode D4 is connected to the drain of MOSFET Q1. The gate of MOSFET Q1 is connected to the tenth terminal of control chip U2. The source of MOSFET Q1 is connected to the second terminal of thermistor RZ. The ninth terminal of control chip U2 is connected to the power supply.

[0061] In this embodiment, the control chip U2 includes three charging modes: trickle charging, constant current charging, and constant voltage charging. Specifically, in constant current charging mode, the control chip U2 detects the constant current charging current through resistor R7; in constant voltage charging mode, the control chip U2 detects the constant voltage charging voltage through resistors R5 and R6.

[0062] The control chip U2 determines whether to enter trickle charging mode based on the voltage at terminal 9 and the battery voltage: When the voltage at terminal 9 is less than the low-voltage latch threshold and greater than the battery voltage, the control chip U2 operates normally. If the battery voltage is less than the trickle charging threshold, it automatically enters trickle charging mode, at which point the charging current is 17.5% of the set constant current charging current. When the battery voltage is greater than the trickle charging threshold, it enters constant current charging mode, where the charging current is set by an internal 120mV reference voltage and an external resistor R7, i.e., the charging current is 120mV / R7. When the battery voltage continues to rise and approaches the constant voltage charging voltage, it enters constant voltage charging mode, and the charging current gradually decreases. During charging, the transistor inside terminal 3 is turned on, outputting a low level, and the charging status is indicated by an LED. When the charging current decreases to 16% of the constant current charging current, charging ends, the transistor inside terminal 3 is turned off, and the output is a high impedance state to indicate the end of charging. The low-voltage latch threshold and trickle charging threshold can be set according to the actual application of the control chip U2. By using the electricity generated by solar panels to charge the batteries, energy efficiency is improved.

[0063] like Figure 4 As shown, in one embodiment, the window-type fresh air unit includes a stepper motor for driving the air valve to open and close, and the air valve control module includes a Darlington tube U3 for driving the stepper motor, the Darlington tube U3 being connected to the controller 110.

[0064] The controller 110 outputs a valve control signal to control the opening and closing of the valve based on the operating mode of the window-type fresh air unit and / or the raindrop detection signal. Specifically, when the window-type fresh air unit is in standby or off state, the controller controls the valve to close, thereby sealing the window opening and achieving the same sound insulation effect as windows with soundproof glass, thus avoiding the problem of increased indoor noise caused by installing window-type fresh air units in windows.

[0065] In this embodiment, the window-type fresh air unit includes a first air valve for closing the indoor air duct, a second air valve for closing the outdoor air duct, a first stepper motor, and a second stepper motor. The first stepper motor drives the first air valve to open and close, and the second stepper motor drives the second air valve to open and close. The first stepper motor and the second stepper motor are respectively connected to the Darlington tube U3. The Darlington tube U3 is used to drive the two stepper motors to realize the opening and closing of the first air valve and the second air valve.

[0066] The controller 110 outputs a valve control signal based on the operating mode of the window-type fresh air unit and / or the raindrop detection signal to control the opening and closing of the first and second air valves. Specifically, when the window-type fresh air unit is in standby or off state, the controller controls the first and second air valves to close. When rain is detected, the controller can control the second air valve to close, thereby preventing rainwater from entering the window-type fresh air unit. When the rain stops, the controller controls the first and second air valves to return to their original state.

[0067] like Figure 5 As shown, in one embodiment, the motor control module 130 uses an optocoupler U7 and a transistor Q6 to drive and control the motor. The optocoupler U7 is used to opto-isolate the motor control signal to avoid signal interference from the external motor from affecting the controller.

[0068] In this embodiment, the motor control signal is a PWM signal. After the PWM signal is optocoupled and photoelectrically isolated, it is output to a transistor for amplification, thereby enhancing its driving capability. The amplified PWM signal can be output to multiple motors, so that a single motor drive circuit can drive multiple motors.

[0069] The motors in this embodiment include a fresh air motor and an exhaust motor. The motor control module 130 includes a fresh air motor control circuit for driving the fresh air motor and an exhaust motor drive circuit for driving the exhaust motor. The fresh air motor control circuit and the exhaust motor drive circuit have the same structure. Please refer to [link to relevant documentation]. Figure 5The descriptions of the above embodiments will not be repeated here.

[0070] In one embodiment, the circuit further includes a remote control communication module for receiving remote control commands and a Bluetooth communication module for receiving Bluetooth control commands; the remote control communication module and the Bluetooth communication module are connected to the controller.

[0071] like Figure 6 As shown, it is a circuit diagram of a remote control communication module in one embodiment. In this embodiment, the remote control communication module uses antenna L6 to receive remote control signals and uses remote control communication chip U6 to decode the remote control signals, thereby obtaining remote control control commands.

[0072] The remote control commands may include commands such as power on / off, speed adjustment, adjustment of operating mode, and timer. In this embodiment, the remote control communication module also includes a bandpass filter circuit composed of inductors L2 and L3 and capacitors C20, C21, and C24. The bandpass filter circuit is used to filter the remote control signal received by antenna L6, thereby improving the accuracy of remote control command decoding.

[0073] The remote control communication module of this application has the characteristics of high sensitivity, low power consumption, high integration, few components, and low cost.

[0074] like Figure 7 The diagram shown is a circuit diagram of a Bluetooth communication module in one embodiment; in this embodiment, the Bluetooth communication module uses the Bluetooth communication chip U5 to implement Bluetooth communication.

[0075] The Bluetooth communication chip U5 is a Bluetooth communication chip that supports the standard IEEE 802.11b / g / n protocol, 2.4G frequency band, 1T1R mode and Bluetooth Low Energy 5.0.

[0076] Users can send Bluetooth remote control commands via mobile phones, computers, or other Bluetooth-enabled devices to remotely control the window-type fresh air unit, thereby improving the convenience of controlling the window-type fresh air unit and enhancing the user experience.

[0077] In one embodiment, the system further includes a PM2.5 detection module for detecting indoor PM2.5 concentration, the PM2.5 detection module being connected to the controller.

[0078] The controller can adjust the operating mode and fan speed of the window-type fresh air unit based on the detected indoor PM2.5 concentration. The correspondence between indoor PM2.5 concentration, operating mode, and fan speed can be preset by the user.

[0079] like Figure 8As shown in the embodiment of this application, the detection signal output terminal of the PM2.5 detection module is connected in parallel with a bidirectional TVS diode to protect the controller and prevent transient overvoltage from damaging the controller.

[0080] The window-type fresh air unit's on / off status, operating mode, and / or fan speed are controlled based on the indoor PM2.5 concentration to improve indoor air quality and user experience.

[0081] In one embodiment, a temperature and humidity detection module for detecting indoor ambient temperature and humidity is further included, the temperature and humidity detection module being connected to the controller.

[0082] The controller can control the window-type fresh air unit's on / off state, operating mode, and / or fan speed based on the detected temperature and humidity. For example, when the ambient humidity is higher than the target humidity, poor indoor ventilation can easily lead to mold and bacteria growth. In this case, the controller can turn on the window-type fresh air unit to ventilate and exchange air, providing dry, comfortable, and fresh air to the room, reducing the possibility of indoor bacteria and virus growth, and providing users with a healthy living environment.

[0083] In one embodiment, the system further includes an indicator light module; the indicator light module includes multiple indicator lights for indicating the operating status of each module, and the multiple indicator lights are respectively connected to the controller.

[0084] In this embodiment of the application, the indicator lights may include a filter replacement indicator light for indicating that the cumulative running time has reached the target set time and the filter needs to be replaced, a battery power indicator light for indicating that the battery power is low and the battery needs to be charged, and a timer indicator light for indicating that the current timer function is in the on or off state.

[0085] The target time can be set according to user needs, for example, it can be 1700 hours.

[0086] The number of indicator lights and their indicated states can be set according to user needs, and there are no restrictions here.

[0087] By using indicator light modules, the operating status of each module of the window-type fresh air unit can be displayed intuitively, making it convenient for users to control the window-type fresh air unit.

[0088] like Figure 9 As shown in the figure, this application embodiment also provides a window-type fresh air unit 200, including a motor 210, an air valve 220 and a window-type fresh air unit control circuit 230 as described in any of the above claims; the motor 210 is connected to a motor control module, and the air valve 220 is connected to an air valve control module.

[0089] This utility model is not limited to the above-described embodiments. If any modifications or variations to this utility model do not depart from the spirit and scope of this utility model, and if such modifications and variations fall within the scope of the claims and equivalent technologies of this utility model, then this utility model also intends to include such modifications and variations.

Claims

1. A control circuit for a window-type fresh air system, characterized in that, When applied to window-type fresh air systems, the circuit includes a controller, a raindrop detection module, a motor control module, an air valve control module, and a solar power supply module. The solar power supply module is connected to the controller, the raindrop detection module, the motor control module, and the air valve control module respectively; the controller is connected to the raindrop detection module, the motor control module, and the air valve control module respectively; the motor control module is connected to the motor of the window-type fresh air unit, and the air valve control module is connected to the air valve of the window-type fresh air unit; the air valve is located at the opening of the window and corresponds to the opening; The controller outputs a motor control signal to the motor control module to control the motor of the window-type fresh air unit based on the detection signal from the raindrop detection module, and outputs an air valve control signal to the air valve control module to control the air valve of the window-type fresh air unit.

2. The window-type fresh air unit control circuit according to claim 1, characterized in that, The raindrop detection module includes a raindrop sensor, a TVS diode, a resistor, an electrolytic capacitor, and a capacitor. The first end of the raindrop sensor is connected to the first end of the TVS diode, the second end of the resistor, the first end of the electrolytic capacitor, the first end of the capacitor, and the controller. The second end of the raindrop sensor, the second end of the TVS diode, the second end of the electrolytic capacitor, and the second end of the capacitor are grounded.

3. The window-type fresh air unit control circuit according to claim 1, characterized in that, The solar power module includes a solar panel, a Schottky diode, and a thermistor; The first end of the Schottky diode is connected to the first end of the solar panel, and the second end of the Schottky diode is connected to the first end of the thermistor. The second end of the thermistor is used to output voltage.

4. The window-type fresh air unit control circuit according to claim 3, characterized in that, The solar power supply module includes a power supply switching unit and a battery. The power supply switching unit is connected to the solar panel and the battery respectively. The power supply switching unit is used to switch to the battery for power supply when the solar panel has no power output.

5. The window-type fresh air unit control circuit according to claim 3, characterized in that, The solar power supply module includes a control chip with the function of automatically tracking the maximum power point of the solar panel, and the control chip is connected to the solar panel.

6. The window-type fresh air unit control circuit according to claim 1, characterized in that, It also includes a remote control communication module for receiving remote control commands and a Bluetooth communication module for receiving Bluetooth control commands; the remote control communication module and the Bluetooth communication module are connected to the controller.

7. The window-type fresh air unit control circuit according to claim 1, characterized in that, It also includes a PM2.5 detection module for detecting indoor PM2.5 concentration, which is connected to the controller.

8. The window-type fresh air unit control circuit according to claim 1, characterized in that, It also includes a temperature and humidity detection module for detecting indoor environmental temperature and humidity, which is connected to the controller.

9. The window-type fresh air unit control circuit according to claim 1, characterized in that, It also includes an indicator light module; the indicator light module includes multiple indicator lights for indicating the operating status of each module, and the multiple indicator lights are respectively connected to the controller.

10. A window-type fresh air system, characterized in that, It includes a motor, a damper, and a window-type fresh air unit control circuit as described in any one of claims 1-9; the motor is connected to a motor control module, and the damper is connected to a damper control module.

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