Wiring-free intelligent on-off control device for air purifier

Abstract

The utility model relates to the technical field of air purifiers, and discloses a wiring-free intelligent on-off control device for an air purifier, which comprises a shell, a radar module, a wireless transmitting module, a wireless receiving module and a main control module. The wireless transmitting module is arranged in the shell, the wireless transmitting module is connected with the radar module, and the wireless transmitting module is used for transmitting a detection signal; the wireless receiving module is arranged in the air purifier, the wireless receiving module is in wireless connection with the wireless transmitting module, and the wireless receiving module is used for receiving the detection signal and outputting a detection demodulation signal; the main control module is arranged in the air purifier, the main control module is connected with the wireless receiving module, and the main control module is used for recognizing and detecting the demodulation signal so as to control opening and closing of the air purifier. The air purifier can be automatically turned on when people go and can be automatically turned off when people go, and the intelligent degree and the user experience feeling of the air purifier are improved.

Description

Technical Field

[0001] This utility model relates to the technical field of air purifiers, and in particular to a wireless intelligent on / off control device for air purifiers. Background Technology

[0002] As people pursue better health and quality of life, air purifiers have gradually become popular devices in homes and offices. Currently, most air purifiers on the market require manual operation or remote control activation, exhibiting a relatively low level of automation.

[0003] In existing technologies, PIR (pyroelectric infrared) sensors are typically used on air purifiers to detect human presence and control the purifier's intelligent on / off operation. However, since PIR sensors primarily rely on human movement to generate a human detection signal, they can only automatically turn on when someone is present. If the person remains stationary without any apparent movement, the sensor will assume no one is there, and the air purifier will automatically shut off. Therefore, they cannot fulfill the requirement of automatically turning on the air purifier when someone is present, severely impacting the application of air purifiers in smart homes and the user experience. Utility Model Content

[0004] The purpose of this invention is to provide a wireless intelligent on / off control device for air purifiers, in order to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0005] The solution to the technical problem of this utility model is: to provide a wireless intelligent on / off control device for air purifiers, the device comprising:

[0006] case;

[0007] A radar module is disposed inside the housing, with its detection surface facing the ground and projecting a detection area. The air purifier is placed on the ground, and the radar module is used to detect human bodies located within the detection area and output detection signals.

[0008] A wireless transmission module is disposed inside the housing and connected to the radar module. The wireless transmission module is used to transmit the detection signal.

[0009] A wireless receiving module is disposed inside the air purifier and is wirelessly connected to the wireless transmitting module. The wireless receiving module is used to receive the detection signal and output the detection demodulation signal.

[0010] The main control module is located inside the air purifier and is connected to the wireless receiving module. The main control module is used to identify the detection and demodulation signal in order to control the opening and closing of the air purifier.

[0011] Furthermore, the wireless air purifier intelligent on / off control device also includes:

[0012] A magnetic suction assembly is disposed on the housing and is used to install the housing in a designated mounting position.

[0013] Furthermore, the wireless transmission module includes:

[0014] Transmitting antenna;

[0015] A high-frequency oscillation circuit, wherein the input terminal of the high-frequency oscillation circuit is connected to the radar module, and the output terminal of the high-frequency oscillation circuit is connected to the transmitting antenna;

[0016] A filtering circuit, the input of which is connected to the radar module, and the output of which is connected to the high-frequency oscillation circuit.

[0017] Furthermore, the wireless receiving module includes:

[0018] Receiving antenna;

[0019] The receiver demodulation circuit has its input terminal connected to the receiving antenna, its output terminal connected to the input terminal of the main control module, and its power supply terminal connected to the power supply terminal of the main control module.

[0020] Furthermore, the high-frequency oscillation circuit includes:

[0021] A first resistor, one end of which is connected to the radar module;

[0022] A high-frequency transistor, wherein the base of the high-frequency transistor is connected to the other end of the first resistor, and the collector of the high-frequency transistor is connected to the transmitting antenna;

[0023] The second resistor has one end connected to the emitter of the high-frequency transistor and the other end grounded.

[0024] A surface acoustic wave (SAW) resonator, one end of which is connected to the other end of the first resistor and the base of the high-frequency transistor, and the other end of which is grounded.

[0025] The second inductor has one end connected to the collector of the high-frequency transistor and the other end connected to the output of the filter circuit.

[0026] The fifth capacitor is connected in parallel with the second inductor;

[0027] The sixth capacitor is used to connect the collector of the high-frequency transistor to the transmitting antenna.

[0028] A seventh capacitor, one end of which is connected to the collector of the high-frequency transistor, and the other end of which is connected to the emitter of the high-frequency transistor;

[0029] The eighth capacitor is connected in parallel with the second resistor.

[0030] Furthermore, the wireless receiving module also includes:

[0031] An LC filter circuit is provided, wherein the input terminal of the LC filter circuit is connected to the power supply terminal of the main control module, and the output terminal of the LC filter circuit is connected to the power supply terminal of the receiving demodulation circuit.

[0032] Furthermore, the wireless air purifier intelligent on / off control device also includes:

[0033] A battery, wherein the battery is disposed inside the housing;

[0034] A voltage regulator module is disposed inside the housing. The input terminal of the voltage regulator module is connected to the battery, and the output terminal of the voltage regulator module is connected to the radar module and the wireless transmission module, respectively.

[0035] Furthermore, the wireless air purifier intelligent on / off control device also includes:

[0036] A trigger button is located on the air purifier and is connected to the main control module. The trigger button is used to respond to adjustment button operations.

[0037] Furthermore, the transmitting antenna is a helical antenna or a linear antenna.

[0038] Furthermore, the receiving antenna is a helical antenna or a linear antenna.

[0039] The beneficial effects of this utility model are as follows: By using a radar module and a wireless transmission module as human body detection detectors, the radar module detects the presence of a human body in the detection area and generates a detection signal. The wireless transmission module transmits the detection signal, and the air purifier equipped with a wireless receiving module can wirelessly receive the transmitted detection signal without the need for additional wired connections and wiring. Furthermore, the detection signal output by the radar module is demodulated to obtain a demodulated detection signal. The main control module reads and identifies the demodulated detection signal and turns the air purifier on or off based on the demodulated detection signal. This enables the air purifier to automatically turn on when a person is present and automatically turn off when a person leaves. This overcomes the shortcoming of existing technologies where PIR infrared pyroelectric sensors cannot detect the presence of a static human body, thus improving the intelligence level of the air purifier and the user experience. Attached Figure Description

[0040] Figure 1 This is a circuit diagram of a wiring-free intelligent on / off control device for an air purifier provided in one embodiment of the present invention;

[0041] Figure 2 This is a circuit diagram of the wireless transmission module of the wireless power-on / off control device for an air purifier that requires no wiring, according to an embodiment of this utility model.

[0042] Figure 3 This is an installation diagram of the wireless air purifier intelligent on / off control device provided in one embodiment of the present invention, installed on the ceiling.

[0043] Reference numerals: Housing 100, Radar module 110, Wireless transmission module 120, Filter circuit 121, First inductor L1, Third capacitor C3, Fourth capacitor C4, High-frequency oscillation circuit 122, First resistor R1, High-frequency transistor Q1, Second resistor R2, Surface acoustic wave resonator RAW, Second inductor L2, Fifth capacitor C5, Sixth capacitor C6, Seventh capacitor C7, Eighth capacitor C8, Transmitting antenna 123, Voltage regulator module 130, Voltage regulator chip IC2, First capacitor C1, Second capacitor C2;

[0044] Air purifier 200, receiving antenna 210, LC filter circuit 220, eleventh capacitor C11, twelfth capacitor C12, fifth inductor L5, receiving demodulation circuit 230, third inductor L3, ninth capacitor C9, tenth capacitor C10, fourth inductor L4, thirteenth capacitor C13, fourteenth capacitor C14, fifteenth capacitor C15, third resistor R3, crystal oscillator X1, receiving demodulation chip IC3. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and should not be construed as limiting the scope of this invention.

[0046] It should be noted that although functional modules are divided in the diagram, in some cases, the modules can be divided differently from those in the system.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" and "second" may explicitly or implicitly include one or more features.

[0048] In the description of this utility model, it should be noted that, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0049] As described in the background section, in existing technologies, PIR (pyroelectric infrared) sensors are typically used on air purifiers to detect human presence and control the purifier's intelligent on / off operation. Since PIR sensors primarily rely on human movement to generate a human sensing signal, they can only automatically turn on when someone is present. If the person remains stationary without significant movement, the sensor will consider the purifier unoccupied, and the purifier will automatically shut off. Therefore, they cannot fulfill the requirement of maintaining a constant air level while the purifier is on automatically, severely impacting the application of air purifiers in smart homes and the user experience.

[0050] In view of this, this application proposes a wireless intelligent on / off control device for air purifiers, which enables the air purifier to be automatically turned on when people are present and automatically turned off when people leave.

[0051] Reference Figure 1 , Figure 2 and Figure 3 In some embodiments of this utility model, a control device for an air purifier 200 includes: a housing 100, a radar module 110, a wireless transmitting module 120, a wireless receiving module, and a main control module.

[0052] Both the radar module 110 and the wireless transmitter module 120 are installed inside the housing 100, with the output of the radar module 110 connected to the input of the wireless transmitter module 120. Both the wireless receiver module and the main control module are installed inside the air purifier 200, with the input of the wireless receiver module wirelessly connected to the output of the wireless transmitter module 120, and the output of the wireless receiver module connected to the input of the main control module. The power supply terminal of the wireless receiver module is also connected to the power supply terminal of the main control module.

[0053] The radar module 110 has its detection surface facing the ground, and it projects a detection area. The air purifier 200 is placed on the ground. Since the air purifier 200 is within the signal coverage area of ​​the wireless transmitter module 120, the wireless transmitter module 120 can wirelessly connect to the wireless receiver module.

[0054] Specifically, the radar module 110 can be selected as an ultra-low power 24GHz radar module that detects the static presence of the human body and has an average operating current of ≤50uA (3 scans per second), such as the RD-03L model.

[0055] For example, refer to Figure 3 , Figure 3 This is a schematic diagram of the device installed on the ceiling. The diagram clearly shows the positional relationship between the detection area and the radar module 110. The radar module 110 has a detection area formed along a first direction, and the cross-sectional area of ​​the detection area gradually increases in the direction away from the radar module 110. The air purifier 200 can be placed either outside or inside the detection area of ​​the radar module 110.

[0056] By separating the detection device from the air purifier 200, the detection device installed on the ceiling can better cover and detect the presence of people in the room over a larger area, thus solving the problem of the narrow detection range of the human sensor on the air purifier 200. In addition, the addition of the wireless transmitter module 120 and the wireless receiver module can reduce the additional wiring, eliminate the inconvenience of wired connections, and facilitate the installation, adjustment and disassembly of the device.

[0057] The radar module 110 can detect human bodies present in the detection area, generate detection signals, and output the detection signals to the wireless transmission module 120.

[0058] The radar module 110 detects a person every 0.3 seconds. If a person is detected in the detection area, the radar module 110 outputs a detection signal indicating that someone is present. If the person remains in the detection area, the radar module 110 stops outputting the detection signal and outputs a low level. If the person has left the detection area, the radar module continues to detect for 10 seconds to confirm. If no one is detected in the detection area, the radar module 110 outputs a detection signal indicating that no one is present. If the person is not in the detection area, the radar module 110 stops outputting the detection signal and outputs a low level, putting the wireless transmitter module 120 into standby mode to save power.

[0059] The wireless transmitting module 120 can transmit detection signals, and the wireless receiving module can receive the detection signals transmitted by the wireless transmitting module 120, demodulate the detection signals output by the radar module 110 to indicate whether a person is present or absent, obtain the demodulated detection signal, and output the demodulated detection signal to the main control module. The main control module can identify the demodulated detection signal indicating whether a person is present or absent, and control the air purifier 200 to turn on and off according to the demodulated detection signal, so that the air purifier 200 turns on when someone is in the detection area and turns off when no one is in the detection area.

[0060] For example, the radar module 110 outputs a coded waveform (detection signal) indicating that someone is present and transmits it to the wireless transmission module 120. After receiving the transmitted code (detection signal), the wireless receiving module in the air purifier 200 demodulates the coded waveform (detection demodulation signal) and sends it to the main control module in the air purifier 200 for reading and identification. When the main control module identifies the code as indicating that someone is present, the air purifier 200 is turned on. When the main control module identifies the code as indicating that no one is present, the air purifier 200 is turned off.

[0061] Using a radar module 110 and a wireless transmitter module 120 as human body detection detectors, the radar module 110 detects the presence of a human body within the detection area and generates a detection signal. The wireless transmitter module 120 transmits the detection signal, and the air purifier equipped with a wireless receiver module can wirelessly receive the transmitted detection signal, eliminating the need for additional wired connections and wiring. Furthermore, the main control module demodulates the detection signal output by the radar module 110 to obtain a demodulated detection signal. Based on this signal, the main control module reads and identifies the demodulated detection signal and turns the air purifier on or off. This achieves automatic activation when a person is present and automatic deactivation when the person leaves, overcoming the limitation of existing PIR infrared pyroelectric sensors in detecting static human presence, thus improving the intelligence level of the air purifier and the user experience.

[0062] Reference Figure 1 In some embodiments of this utility model, the wireless transmission module 120 includes: a transmitting antenna 123, a high-frequency oscillation circuit 122, and a filtering circuit 121.

[0063] The transmitting antenna 123 is connected to the output terminal of the high-frequency oscillation circuit 122, and the output terminal of the radar module 110 is connected to the input terminal of the high-frequency oscillation circuit 122.

[0064] Taking a 433MHz transmission frequency as an example, the transmitting antenna 123 can be a linear antenna formed by a 17cm long rigid wire or a spiral antenna made by winding a 17cm long rigid wire.

[0065] In one embodiment, the high-frequency oscillation circuit 122 includes: a first resistor R1, a high-frequency transistor Q1, a second resistor R2, and a surface acoustic wave (SAW) resonator.

[0066] One end of the first resistor R1 is connected to the OUT pin of the radar module 110, and the other end of the first resistor R1 is connected to the base of the high-frequency transistor Q1. The collector of the high-frequency transistor Q1 is connected to the transmitting antenna 123, and the emitter of the high-frequency transistor Q1 is grounded through the second resistor R2. One end of the surface acoustic wave (SAW) resonator RAW is connected to the other end of the first resistor R1 and the base of the high-frequency transistor Q1, and the other end of the SAW resonator RAW is grounded.

[0067] The high-frequency oscillation circuit 122 also includes: a second inductor L2, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, and an eighth capacitor C8.

[0068] The collector of the high-frequency transistor Q1 is connected to the transmitting antenna 123 through the sixth capacitor C6. That is, one end of the sixth capacitor C6 is connected to the transmitting antenna 123, and the other end of the sixth capacitor C6 is connected to the collector of the high-frequency transistor Q1.

[0069] One end of the second inductor L2 is connected to the collector of the high-frequency transistor Q1, the other end of the sixth capacitor C6, one end of the seventh capacitor C7, and one end of the fifth capacitor C5. The other end of the second inductor L2 is connected to the other end of the fifth capacitor C5, and the other end of the fifth capacitor C5 is connected to the output terminal of the filter circuit 121. In other words, the other end of the second inductor L2 is also connected to the output terminal of the filter circuit 121.

[0070] One end of the seventh capacitor C7 is connected to the collector of the high-frequency transistor Q1, the other end of the sixth capacitor C6, one end of the second inductor L2, and one end of the fifth capacitor C5. The other end of the seventh capacitor C7 is connected to the emitter of the high-frequency transistor Q1, one end of the second resistor R2, and one end of the eighth capacitor C8. The other end of the eighth capacitor C8 and the other end of the second resistor R2 are both grounded.

[0071] Specifically, taking a 433MHz transmission frequency as an example, the surface acoustic wave (SAW) resonator (RAW) can be an HR433A model in an F-11 package. The high-frequency transistor Q1 is a 2SC3356 surface-mount high-frequency transistor. The second resistor R2 can be a 100Ω–120Ω surface-mount resistor. The first resistor R1 can be a 10K–22K surface-mount resistor. The sixth capacitor C6 and the seventh capacitor C7 can be 3pF capacitors, the eighth capacitor can be an 8pF capacitor, and the fifth capacitor C5 is reserved for adjusting the transmission effect and can be left unsoldered for now. The second inductor L2 can be an 18nH 0603 surface-mount high-frequency multilayer inductor.

[0072] The input terminal of the filter circuit 121 is connected to the VCC pin of the radar module 110, and the output terminal of the filter circuit 121 is connected to the high-frequency oscillation circuit 122. The filter circuit 121 can block electromagnetic interference signals.

[0073] In one embodiment, the filter circuit 121 includes a first inductor L1, a third capacitor C3, and a fourth capacitor C4.

[0074] One end of the first inductor L1 is connected to the VCC pin of the radar module 110. The other end of the first inductor L1 is connected to the high-frequency oscillation circuit 122, one end of the third capacitor C3, and one end of the fourth capacitor C4. One end of the third capacitor C3 is connected to the high-frequency oscillation circuit 122, the other end of the first inductor L1, and one end of the fourth capacitor C4. One end of the fourth capacitor C4 is connected to the high-frequency oscillation circuit 122, the other end of the first inductor L1, and one end of the third capacitor C3. The other ends of the third capacitor C3 and the fourth capacitor C4 are both grounded. That is to say, the other end of the fifth capacitor C5 is connected to one end of the fourth capacitor C4.

[0075] Specifically, the fourth capacitor C4 can be a 100nF surface mount capacitor, the third capacitor C3 can be a 22uF surface mount capacitor, and the first inductor L1 can be a 10uH 0805 surface mount multilayer inductor.

[0076] For example, when the OUT pin of the radar module 110 outputs a detection signal, the high-frequency oscillation circuit 122, composed of a high-frequency transistor Q1, is driven to operate through the second resistor R2. The transmission frequency of this circuit depends on the natural frequency of the surface acoustic wave (SAW) resonator. The detection signal is transmitted through the resonance of the high-frequency oscillation circuit 122 and the transmitting antenna 123.

[0077] Reference Figure 2 In some embodiments of this utility model, the wireless receiving module includes: a receiving antenna 210, a receiving demodulation circuit 230, and an LC filter circuit 220.

[0078] The input terminal of the receiving demodulation circuit 230 is connected to the receiving antenna 210, the output terminal of the receiving demodulation circuit 230 is connected to the input terminal of the main control module, and the power supply terminal of the receiving demodulation circuit 230 is connected to the power supply terminal of the main control module through the LC filter circuit 220, so as to realize the connection between the power supply terminal of the receiving demodulation circuit 230 and the power supply terminal of the main control module.

[0079] In other words, the input terminal of the LC filter circuit 220 is connected to the power supply terminal of the main control module, and the output terminal of the LC filter circuit 220 is connected to the power supply terminal of the receiving demodulation circuit 230.

[0080] In one embodiment, the LC filter circuit 220 includes an eleventh capacitor C11, a twelfth capacitor C12, and a fifth inductor L5. One end of the eleventh capacitor C11 and one end of the twelfth capacitor C12 are both grounded. The other end of the eleventh capacitor C11 is connected to one end of the fifth inductor L5, and the other end of the twelfth capacitor C12 is connected to the other end of the fifth inductor L5. One end of the fifth inductor L5 is connected to the power supply terminal of the receiving demodulation circuit 230, and the other end of the fifth inductor L5 is connected to the power supply terminal of the main control module.

[0081] Taking a 433MHz transmission frequency as an example, the receiving antenna 210 can be a linear antenna formed by a 17cm long rigid wire or a spiral antenna wound with a 17cm long rigid wire.

[0082] In one embodiment, the receiving demodulation circuit 230 includes: a third inductor L3, a ninth capacitor C9, a tenth capacitor C10, a fourth inductor L4, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a third resistor R3, a crystal oscillator X1, and a receiving demodulation chip IC3.

[0083] The third inductor L3 and the ninth capacitor C9 are connected in parallel to form an LC resonant circuit. One end of the LC resonant circuit is connected to the receiving antenna 210, and the other end is grounded. One end of the tenth capacitor C10 is connected to the receiving antenna 210, and the other end is connected to the second pin of the receiving demodulation chip IC3. One end of the fourth inductor L4 is connected to both one end of the tenth capacitor C10 and the second pin of the receiving demodulation chip IC3, and the other end of the fourth inductor L4 is grounded.

[0084] Pins 1 and 6 of the receiver / demodulation chip IC3 are grounded. Pin 3 of the receiver / demodulation chip IC3 is connected to the power supply terminal of the main control module through the LC filter circuit 220. Pin 4 of the receiver / demodulation chip IC3 is grounded through the thirteenth capacitor C13. Pin 5 of the receiver / demodulation chip IC3 is connected to the input terminal of the main control module through the third resistor R3. Pin 7 of the receiver / demodulation chip IC3 is grounded through the fifteenth capacitor C15. Pin 8 of the receiver / demodulation chip IC3 is grounded through the crystal oscillator X1.

[0085] One end of the fourteenth capacitor C14 is connected to the fifth pin of the receiver demodulation chip IC3, and the other end of the fourteenth capacitor C14 is grounded.

[0086] Specifically, taking a 433MHz receiving frequency as an example, the receiver demodulation chip IC3 can be a surface-mount superheterodyne receiver chip of model SYN480R. The crystal oscillator X1 can be a 49SMD packaged surface-mount crystal oscillator with a frequency of 6.7458MHz and an accuracy of 10PPM. The fifth inductor L5 can be a 10uH 0805 surface-mount multilayer inductor. The third inductor L3 can be a 27nH 0603 surface-mount high-frequency multilayer inductor. The fourth inductor L4 can be a 33nH 0603 surface-mount high-frequency multilayer inductor. The third resistor R3 can be a 100Ω surface-mount resistor. The ninth capacitor C9 can be a 6pF capacitor. The tenth capacitor C10 can be a 2.4pF capacitor. The eleventh, twelfth, and fourteenth capacitors C11, C12, and C14 can be 1nF surface-mount capacitors. The fifteenth capacitor C15 can be a 2.2uF surface-mount capacitor.

[0087] For example, refer to Figure 2 After receiving the detection signal through the receiving antenna 210, the receiving demodulation chip IC3 demodulates the detection demodulation signal and outputs it through the Data port to the main control module of the air purifier 200 for reading and identification.

[0088] Reference Figure 1 and Figure 3 In some embodiments of this utility model, the control device further includes: a magnetic suction component, a battery, and a voltage regulator module 130.

[0089] The magnetic assembly is installed on the housing 100. The housing 100 can be installed in the designated mounting position through the magnetic assembly, so as to achieve simple and quick installation in any position. After the battery is depleted, the housing 100 can be easily removed to recharge the battery.

[0090] For example, refer to Figure 1 and Figure 3 The housing 100 can be mounted on the ceiling using the magnetic attachment assembly, while the air purifier 200 can be placed on the ground, with the air purifier 200 located within the signal coverage area of ​​the wireless transmission module 120. The housing 100 can also be mounted in other locations using the magnetic attachment assembly, but this will not be described in detail in this embodiment.

[0091] Both the battery and the voltage regulator module 130 are installed inside the housing 100, which has a battery compartment for holding the battery.

[0092] The battery is connected to the input terminal of the voltage regulator module 130, and the output terminal of the voltage regulator module 130 is connected to the power supply terminal of the radar module 110. The output terminal of the voltage regulator module 130 is also connected to the filter circuit 121 in the wireless transmission module 120. The voltage regulator module 130 can supply power to both the radar module 110 and the wireless transmission module 120. In other words, the output terminal of the voltage regulator module 130 is connected to the wireless transmission module 120 through the filter circuit 121.

[0093] Specifically, the battery options include a 3.7V polymer lithium battery with a 450mAh capacity, a plug and output cable, and a built-in lithium battery protection board, or an 18650 lithium battery.

[0094] The voltage regulator module 130 includes: a voltage regulator chip IC2, a first capacitor C1, and a second capacitor C2.

[0095] Reference Figure 1 The BAT port is the battery port. The first capacitor C1 is the input filter capacitor, and the second capacitor C2 is the output filter capacitor. The voltage regulator IC2 reduces the battery voltage to 3.3V to power the radar module 110 and the wireless transmitter module 120, so as to prevent the battery power supply from exceeding the maximum operating voltage of the radar module 110 and causing damage and failure to work.

[0096] Specifically, the voltage regulator IC2 can be an ultra-low power, low dropout step-down LDO chip with a quiescent current ≤3uA, a withstand current ≥0.5A, and an input-output voltage difference ≤0.15V under an output current of 100mA, such as the HL6231-3.3V. The first capacitor C1 can be a 10uF surface mount capacitor, and the second capacitor C2 can be a 22uF surface mount capacitor.

[0097] Reference Figure 3 In some embodiments of this utility model, the air purifier 200 is also provided with a trigger button. The trigger button is connected to the input terminal of the main control module and can respond to the operation of the adjustment button.

[0098] For example, after the air purifier 200 is turned on, the user can adjust the working mode by triggering the button and save it in the main control module, so that it will automatically work in the set working mode the next time it is turned on. In addition, after the air purifier 200 is turned on, the user can also adjust the operating parameters of the air purifier 200 by triggering the button and save them in the main control module.

[0099] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A wireless, intelligent on / off control device for air purifiers, characterized in that: include: case; A radar module is disposed inside the housing, with its detection surface facing the ground and projecting a detection area. The air purifier is placed on the ground, and the radar module is used to detect human bodies located within the detection area and output detection signals. A wireless transmission module is disposed inside the housing and connected to the radar module. The wireless transmission module is used to transmit the detection signal. A wireless receiving module is disposed inside the air purifier and is wirelessly connected to the wireless transmitting module. The wireless receiving module is used to receive the detection signal and output the detection demodulation signal. The main control module is located inside the air purifier and is connected to the wireless receiving module. The main control module is used to identify the detection and demodulation signal in order to control the opening and closing of the air purifier.

2. The wireless intelligent on / off control device for air purifiers according to claim 1, characterized in that, Also includes: A magnetic suction assembly is disposed on the housing and is used to install the housing in a designated mounting position.

3. The wireless intelligent on / off control device for an air purifier according to claim 1, characterized in that, The wireless transmission module includes: Transmitting antenna; A high-frequency oscillation circuit, wherein the input terminal of the high-frequency oscillation circuit is connected to the radar module, and the output terminal of the high-frequency oscillation circuit is connected to the transmitting antenna; A filtering circuit, the input of which is connected to the radar module, and the output of which is connected to the high-frequency oscillation circuit.

4. The wireless intelligent on / off control device for an air purifier according to claim 1, characterized in that, The wireless receiving module includes: Receiving antenna; The receiver demodulation circuit has its input terminal connected to the receiving antenna, its output terminal connected to the input terminal of the main control module, and its power supply terminal connected to the power supply terminal of the main control module.

5. The wireless intelligent on / off control device for an air purifier according to claim 3, characterized in that, The high-frequency oscillation circuit includes: A first resistor, one end of which is connected to the radar module; A high-frequency transistor, wherein the base of the high-frequency transistor is connected to the other end of the first resistor, and the collector of the high-frequency transistor is connected to the transmitting antenna; The second resistor has one end connected to the emitter of the high-frequency transistor and the other end grounded. A surface acoustic wave (SAW) resonator, one end of which is connected to the other end of the first resistor and the base of the high-frequency transistor, and the other end of which is grounded. The second inductor has one end connected to the collector of the high-frequency transistor and the other end connected to the output of the filter circuit. The fifth capacitor is connected in parallel with the second inductor; The sixth capacitor is used to connect the collector of the high-frequency transistor to the transmitting antenna. A seventh capacitor, one end of which is connected to the collector of the high-frequency transistor, and the other end of which is connected to the emitter of the high-frequency transistor; The eighth capacitor is connected in parallel with the second resistor.

6. The wireless intelligent on / off control device for an air purifier according to claim 4, characterized in that, The wireless receiving module further includes: An LC filter circuit is provided, wherein the input terminal of the LC filter circuit is connected to the power supply terminal of the main control module, and the output terminal of the LC filter circuit is connected to the power supply terminal of the receiving demodulation circuit.

7. The wireless intelligent on / off control device for an air purifier according to claim 1, characterized in that, Also includes: A battery, wherein the battery is disposed inside the housing; A voltage regulator module is disposed inside the housing. The input terminal of the voltage regulator module is connected to the battery, and the output terminal of the voltage regulator module is connected to the radar module and the wireless transmission module, respectively.

8. The wireless intelligent on / off control device for an air purifier according to claim 1, characterized in that, Also includes: A trigger button is located on the air purifier and is connected to the main control module. The trigger button is used to respond to adjustment button operations.

9. The wireless intelligent on / off control device for an air purifier according to claim 3, characterized in that, The transmitting antenna is either a helical antenna or a linear antenna.

10. The wireless intelligent on / off control device for an air purifier according to claim 4, characterized in that, The receiving antenna is a helical antenna or a linear antenna.

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