Automatic control device of air cooler

Abstract

The invention relates to an automatic control device for an air cooler, which comprises a power supply, an LDO (Low Dropout Regulator) voltage reduction power supply circuit, a relay control circuit, a main control chip, an ambient light sensor, a radar system, a temperature sensor, an air quality sensor and a communication circuit, the power supply is connected with the LDO step-down power supply circuit, the relay control circuit, the ambient light sensor, the radar system, the temperature sensor, the air quality sensor and the communication circuit, the LDO step-down power supply circuit is connected with the main control chip, and the main control chip receives signal data of the ambient light sensor, the radar system, the temperature sensor and the communication circuit. All relay switches in the relay control circuit are controlled according to the signal data, and automatic control over the air cooler is achieved. Compared with the prior art, the device has the advantages of being convenient to use, suitable for concealed installation and the like.

Description

Technical Field

[0001] The invention relates to the field of intelligent control, and in particular to an automatic control device for a cooling fan. Background Art

[0002] With the development of home appliance functions, most large appliances such as household air coolers are integrated with multiple application functions, such as blowing, lighting, sterilization, air purification, etc., which provide more choices for the purpose of equipment use and also increase the complexity of controlling the equipment.

[0003] The use of manual control to enable or disable functions such as air conditioning, lighting, blue light sterilization, negative ion purification, and ventilation depends on the user's understanding and application habits of the above functions. In an environment where no one is active for a long time or when the power is forgotten to be turned off, it will cause unnecessary function operation and energy waste; and the mistaken activation of functions such as ultraviolet rays that are not suitable for use when people are present will cause damage to human health. At present, most smart homes only use remote control to facilitate remote operation by personnel, which cannot fundamentally solve the problem of incorrect operation.

[0004] Intelligently enabling the correct operating functions and shutting down functions that do not need to run are the main issues that should be addressed in the future development of smart home devices. Summary of the invention

[0005] The purpose of the present invention is to provide an automatic control device for a cooling fan in order to overcome the defects of the prior art.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] An automatic control device for an air cooler comprises a power supply, an LDO step-down power supply circuit, a relay control circuit, a main control chip, an ambient light sensor, a radar system, a temperature sensor, an air quality sensor and a communication circuit, wherein the power supply is connected to the LDO step-down power supply circuit, the relay control circuit, the ambient light sensor, the radar system, the temperature sensor, the air quality sensor and the communication circuit, and the LDO step-down power supply circuit is connected to the main control chip. The main control chip receives signal data from the ambient light sensor, the radar system, the temperature sensor and the communication circuit, and controls each relay switch in the relay control circuit according to the signal data, thereby realizing automatic control of the air cooler.

[0008] Furthermore, the radar system includes a microstrip antenna and a radar signal processing circuit. The microstrip antenna is composed of a dielectric substrate in the middle of a PCB board, a radiator of a top copper foil antenna and a bottom ground plane copper foil. The radar signal processing circuit includes a voltage-controlled oscillator, a transmitting power amplifier, a receiving low-noise amplifier, a mixer, an intermediate frequency signal demodulator and an intermediate frequency signal amplifier.

[0009] Furthermore, the radar system uses FMCW frequency-modulated continuous waves to detect human targets and obtain radar intermediate frequency signal data. The radar intermediate frequency signal data is input into the main control chip for analog-to-digital conversion sampling. Through millimeter-wave radar signal algorithm processing and object perception algorithm, motion perception and vital sign signal monitoring are performed to determine whether there are people within the working range.

[0010] Furthermore, it also includes a PWM driver connected to the power supply, the PWM driver is connected to the lighting LED, and the main control chip performs closed-loop control of the LED drive circuit through a PWM wave pulse width modulation algorithm based on the reading of the ambient light sensor to adjust the illumination of the lighting LED; when the radar system detects that there is no one in the working range, the lighting LED is turned off.

[0011] Furthermore, the power supply includes an input end, a filter circuit, a full-bridge rectifier filter, a MOS switch device, a transformer, a half-bridge rectifier filter and an output end which are connected in sequence. The output end controls the opening and closing state of the MOS switch device to adjust the output voltage and current through a sampling comparison circuit and a PWM control circuit which are connected in sequence. The output end is connected to an LDO step-down power supply circuit and a relay control circuit.

[0012] Furthermore, the communication circuit includes a wireless Bluetooth communication circuit and a wireless WIFI communication circuit. The main control chip is connected to the terminal device via the communication circuit, and the terminal device is used to remotely operate the air cooler.

[0013] Furthermore, the relay control circuit includes multiple 12V relays and multiple Darlington transistor chips. When there is a high-level signal at the input end of the Darlington transistor chip, the output end is grounded and turned on, and the relay control end is energized; when there is a low-level signal at the input end, the output end is at a 12V level, and the relay control end is disconnected; the relay control end is provided with an AC220 load, and the multiple 12V relays include a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, a seventh relay and an eighth relay. The first relay controls the low speed of the fan, the first relay controls the medium speed of the fan, the third relay controls the high speed of the fan, the fourth relay controls the swing motor, the fifth relay controls the ultraviolet sterilization lamp, the sixth relay controls the ventilation motor, the seventh relay controls the negative ion generator, and the eighth relay controls the refrigerator.

[0014] Furthermore, the environmental data detected by the air quality sensor include CO2, CH2O, TVOC, PM2.5 and PM10. The main control chip controls the sixth relay and the seventh relay according to the environmental data and in combination with the air control algorithm, and activates the ventilation motor and the negative ion generator.

[0015] Furthermore, the main control chip obtains the temperature data of the current environment by reading the digital temperature sensor, and controls the first relay, the second relay, the third relay, the fourth relay and the eighth relay through the temperature data and in combination with the temperature control algorithm, and controls the speed of the fan, the opening and closing angle of the swing motor and the refrigerator. When the radar system detects that there is no one in the working range, the fan, the swing motor and the refrigerator are turned off.

[0016] Furthermore, when the radar system detects that there is no one within the working range, the main control chip controls the fifth relay to enable the ultraviolet sterilization lamp.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) The present invention receives signal data from various sensors and radars through the main control chip, determines the air quality and personnel status of the working environment, realizes automatic adjustment of the working status of the equipment, accurately responds to environmental requirements, and avoids resource waste and safety risks caused by incorrect operations.

[0019] 2) The present invention uses a filtering circuit to remove noise and interference from the input power supply, enters the full-bridge rectifier filter, converts AC power into DC power, controls the charging and discharging of the transformer by controlling the conduction and cutoff of the MOS tube, and stabilizes the voltage within the working range after passing through a low-voltage half-bridge rectifier circuit and filtering. A sampling comparison circuit is provided at the output end of the power supply to adjust the output voltage and current to meet the load requirements.

[0020] 3) The present invention does not require a contact input device, and realizes concealed penetrating perception through radar and various sensors, which is suitable for embedded concealed installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0023] Example 1

[0024] The present invention discloses an automatic control device for an air cooler, comprising a power supply, an LDO step-down power supply circuit, a relay control circuit, a main control chip, an ambient light sensor, a radar system, a temperature sensor, an air quality sensor and a communication circuit. The power supply is connected to the LDO step-down power supply circuit and the relay control circuit, the LDO step-down power supply circuit is connected to the main control chip, the main control chip receives signal data from the ambient light sensor, the radar system, the temperature sensor and the communication circuit, controls each relay switch in the relay control circuit according to the signal data, and realizes automatic control of the air cooler.

[0025] 1. Device connection

[0026] like Figure 1 As shown, the present invention adopts an MCU main control chip, and the power supply input is an AC220V mains input, and passes through an EMI filter circuit, a full-bridge rectifier filter circuit, a MOS switch device, a transformer, and a half-bridge rectifier filter circuit in sequence to output 12V DC power, and the output is connected in parallel to a sampling comparison circuit, an LDO step-down power supply circuit, a relay control circuit, and a PWM driver. The sampling comparison circuit is connected to the MOS switch device through a PWM control circuit to form a loop. The LDO step-down power supply circuit is used to power the MCU main control chip, the radar signal processing circuit, the communication circuit, and various sensors. The MCU main control chip receives sensor signals, radar signals, and communication signals, and then processes them to obtain control signals, and operates the relay control circuit and the PWM driver through the control signals to control the operation of various functional devices.

[0027] 2. Structure Settings

[0028] The present invention is provided with:

[0029] 1. 12V DC output: After AC220V mains is powered on, it passes through the EMI filter circuit to remove the noise and interference of the input power supply, enters the full-bridge rectifier filter, and converts the AC power into about 311V DC. Then the PWM control circuit sends a 50-65KHz switching frequency to the control pin of the MOS device, controls the charging and discharging of the transformer by controlling the conduction and cutoff of the MOS tube, and stabilizes the voltage within the range of 12V after passing through the low-voltage half-bridge rectifier circuit and filtering. A sampling comparison circuit is set at the output end of the power supply to adjust the output voltage and current to meet the needs of the load.

[0030] 2. LDO step-down power supply circuit: The DC 12V voltage of the switching power supply is connected to the Vin pin of the LDO through a 10-ohm resistor and a capacitor filter. It passes through the internal step-down circuit of the LDO chip and then to the externally connected capacitor filter to output a stable 3.3V voltage.

[0031] 3. Relay control circuit: The relay control circuit is mainly composed of 8-way 12V relays and 8-way Darlington transistor chip ULN2803A. When there is a high-level signal at the input end of ULN2803A, the output end is grounded and turned on, and the relay control end is energized; when there is a low-level signal at the input end of ULN2803A, the output end is 12V level and the relay control end is disconnected. The other end of the relay controls the AC220 load. The relay includes the first relay, the second relay, the third relay, the fourth relay, the fifth relay, the sixth relay, the seventh relay and the eighth relay. The first relay controls the low speed of the fan, the first relay controls the medium speed of the fan, the third relay controls the high speed of the fan, the fourth relay controls the swing motor, the fifth relay controls the ultraviolet sterilization lamp, the sixth relay controls the ventilation motor, the seventh relay controls the negative ion generator, and the eighth relay controls the refrigerator.

[0032] 4. Ambient light sensor: The working characteristics of the ambient light sensor include measuring illumination range (0.1-40000Lux), resolution (0.1Lux), accuracy of about 5%, and automatic suppression of 50Hz and 60Hz fluorescent light fluctuations. The TSL2561T chip has two photodiode channels inside, channel 0 can detect both visible light and infrared light. When the photodiode generates photocurrent, it is converted into corresponding digital data through the integral A / D converter. The integral A / D converter receives the photocurrent signal and automatically converts the integral into digital data in one integration cycle, and saves the digital data in 16 internal registers. The 16 registers access the data through the MCU control IIC bus protocol.

[0033] 5. Radar system: Based on the principle of Doppler effect, the frequency difference between the transmitted and received electromagnetic wave radar signals is used to realize the precise perception of object movement, micro-motion, existence and other functions. This design has a high-gain, high-performance directional microstrip antenna integrated with PCB. The structure of the microstrip antenna consists of a dielectric substrate in the middle of the PCB board, a radiator of the top copper foil antenna and a copper foil of the bottom ground plane. The radar signal processing circuit includes a voltage-controlled oscillator, a transmitting power amplifier, a receiving low-noise amplifier, a mixer, an intermediate frequency signal demodulator, an intermediate frequency signal amplifier and other signal processing circuits.

[0034] 6. Temperature sensor: The working characteristics of the digital temperature sensor are: temperature measurement range: -70℃~150℃, temperature measurement accuracy: 0.5℃, power-on and idle state. To start temperature measurement, MCU sends a command, and after the conversion time, 16-bit temperature data is generated and stored in the register. The 16-bit register is accessed and read through the MCU to control the IIC bus protocol.

[0035] 7. Air quality sensor: The working characteristics of the air quality sensor include environmental detection data, sensitivity, and stable data such as CO2, CH2O, TVOC, PM2.5, and PM10. After the air quality sensor is powered on, it will be warmed up for 2 minutes. The MCU accesses the registers of the five air quality sensors, such as CO2, CH2O, TVOC, PM2.5, and PM10, through the IIC bus protocol instructions to read the data and store it in the MCU internal Flash.

[0036] 8. Wireless Bluetooth communication circuit and wireless WIFI communication circuit: The wireless Bluetooth communication circuit and wireless WIFI communication circuit are based on RTL82720DN and have high performance and low power consumption. They support 2.4GHz+5GHz dual-band Wi-Fi and BLE 5.0, support STA / AP / STA+AP working modes, support 802.11a / b / g / n protocols and WPA / WPA2 security protocols, and have built-in TCP / IP protocol stack.

[0037] 3. Control Logic

[0038] The following control applications are provided in this embodiment:

[0039] Radar presence awareness function application:

[0040] The radar signal processing circuit of the device of the present invention automatically controls the planar radar antenna of the transmitting and receiving antenna to conduct electromagnetic wave signals, and uses FMCW frequency-modulated continuous waves to detect human targets directly in front. The obtained radar intermediate frequency signal data is sampled by the ADC of the MCU. The MCU has efficient millimeter-wave radar signal algorithm processing technology and intelligent object perception algorithm inside, which can realize high-sensitivity and high-stability perception of object movement, micro-motion, existence and other actions, and can also detect vital sign signals such as human breathing in resting states such as sleeping and sitting.

[0041] Digital ambient light detection function application:

[0042] The device of the present invention controls the IIC bus protocol through the MCU to access the 16 registers of the TSL2561T digital ambient light sensor to obtain the current ambient light illumination data. The LED driving circuit is closed-loop controlled through the PWM wave pulse width modulation algorithm to achieve constant brightness dimming of the lighting LED lamp. The MCU senses whether there are people on the scene through the radar system and automatically turns off the LED lighting when no one is present.

[0043] Digital temperature detection function application:

[0044] The device of the present invention controls the IIC bus protocol through the MCU to access the 16-bit register of the digital temperature sensor to obtain the data of the current ambient temperature. The MCU controls the first relay, the second relay, the third relay, the fourth relay and the eighth relay through the temperature data and in combination with the temperature control algorithm, controls the speed of the fan, the opening and closing angle of the swing motor and the refrigerator. When the radar system detects that there is no one in the working range, the fan, the swing motor and the refrigerator are turned off, and the low speed, medium speed, high speed and the opening and closing angle of the swing motor of the fan are controlled in real time. When the ambient temperature exceeds 30, the refrigerator is automatically turned on and cold air is blown out. The MCU senses whether there is a person present through the radar system, and automatically turns off the fan, the swing motor and the refrigerator when no one is present.

[0045] Air quality detection function application:

[0046] The device of the present invention controls the IIC bus protocol access instruction through the MCU to access the quality air sensors such as CO2, CH2O, TVOC, PM2.5, PM10, etc., obtains the air quality data in 5 groups of environments and combines the air control algorithm to control the sixth relay and the seventh relay, enable the ventilation motor and the negative ion generator, and control the ventilation, negative ion generator and other functions to purify the air in real time. The MCU senses whether there are people present through the radar system. When there is no one, the main control chip controls the fifth relay and enables the ultraviolet sterilization lamp to avoid damage to the human eyes and surface skin tissue.

[0047] Wireless communication function application:

[0048] The device of the present invention is connected to a mobile phone client through dual-mode communication via wireless Bluetooth and wireless WIFI, and realizes remote control of functions such as hair drying adjustment, lighting, blue light sterilization, negative ion purification, ventilation, etc., which is convenient for users to use in different scenarios and set personalized scene experience, so that it can intelligently adapt to different usage needs.

[0049] The present invention uses a radar system to determine whether there are people present, and intelligently activates or shuts down some application functions, thereby realizing intelligent control of the air cooler equipment and additional functions, and reducing damage to people caused by unnecessary activation of functions or incorrect use of application functions.

[0050] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An automatic control device for a cooling fan, characterized in that: The invention comprises a power supply, an LDO step-down power supply circuit, a relay control circuit, a main control chip, an ambient light sensor, a radar system, a temperature sensor, an air quality sensor and a communication circuit. The power supply is connected to the LDO step-down power supply circuit, the relay control circuit, the ambient light sensor, the radar system, the temperature sensor, the air quality sensor and the communication circuit. The LDO step-down power supply circuit is connected to the main control chip. The main control chip receives signal data from the ambient light sensor, the radar system, the temperature sensor and the communication circuit, and controls each relay switch in the relay control circuit according to the signal data to realize automatic control of the air cooler.

2. The automatic control device for cooling air fan according to claim 1, characterized in that: The radar system includes a microstrip antenna and a radar signal processing circuit. The microstrip antenna is composed of a dielectric substrate in the middle of a PCB board, a radiator of a top copper foil antenna and a bottom ground plate copper foil. The radar signal processing circuit includes a voltage-controlled oscillator, a transmitting power amplifier, a receiving low-noise amplifier, a mixer, an intermediate frequency signal demodulator and an intermediate frequency signal amplifier.

3. The automatic control device for cooling air blower according to claim 1, characterized in that: The radar system uses FMCW frequency-modulated continuous waves to detect human targets and obtain radar intermediate frequency signal data. The radar intermediate frequency signal data is input into the main control chip for analog-to-digital conversion sampling. The millimeter wave radar signal algorithm processing and object perception algorithm are used to perform motion perception and vital sign signal monitoring to determine whether there is a person within the working range.

4. The automatic control device for cooling air blower according to claim 1, characterized in that: It also includes a PWM driver connected to a power supply, the PWM driver is connected to a lighting LED, and the main control chip performs closed-loop control of the LED drive circuit through a PWM wave pulse width modulation algorithm based on the reading of the ambient light sensor to adjust the illumination of the lighting LED; when the radar system detects that there is no one within the working range, the lighting LED is turned off.

5. The automatic control device for cooling air fan according to claim 1, characterized in that: The power supply includes an input end, a filter circuit, a full-bridge rectifier filter, a MOS switch device, a transformer, a half-bridge rectifier filter and an output end which are connected in sequence. The output end controls the on / off state of the MOS switch device to adjust the output voltage and current through a sampling comparison circuit and a PWM control circuit which are connected in sequence. The output end is connected to an LDO step-down power supply circuit and a relay control circuit.

6. The automatic control device for cooling air blower according to claim 1, characterized in that: The communication circuit includes a wireless Bluetooth communication circuit and a wireless WIFI communication circuit. The main control chip is connected to a terminal device via the communication circuit. The terminal device is used to remotely operate the air cooler.

7. The automatic control device for cooling air blower according to claim 1, characterized in that: The relay control circuit includes multiple 12V relays and multiple Darlington transistor chips. When there is a high-level signal at the input end of the Darlington transistor chip, the output end is grounded and turned on, and the relay control end is energized; when there is a low-level signal at the input end, the output end is at a 12V level, and the relay control end is disconnected; the relay control end is provided with an AC220 load, and the multiple 12V relays include a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, a seventh relay and an eighth relay. The first relay controls the low speed of the fan, the first relay controls the medium speed of the fan, the third relay controls the high speed of the fan, the fourth relay controls the swing motor, the fifth relay controls the ultraviolet sterilization lamp, the sixth relay controls the ventilation motor, the seventh relay controls the negative ion generator, and the eighth relay controls the refrigerator.

8. The automatic control device for cooling air machine according to claim 7, characterized in that: The environmental data detected by the air quality sensor include CO2, CH2O, TVOC, PM2.5 and PM10. The main control chip controls the sixth relay and the seventh relay according to the environmental data and in combination with the air control algorithm, and activates the ventilation motor and the negative ion generator.

9. The automatic control device for cooling air machine according to claim 7, characterized in that: The main control chip obtains the temperature data of the current environment by reading the digital temperature sensor, and controls the first relay, the second relay, the third relay, the fourth relay and the eighth relay through the temperature data and in combination with the temperature control algorithm, and controls the speed of the fan, the opening and closing angle of the swing motor and the refrigerator. When the radar system detects that there is no one in the working range, the fan, the swing motor and the refrigerator are turned off.

10. The automatic control device for cooling air machine according to claim 7, characterized in that: When the radar system detects that there is no one within the working range, the main control chip controls the fifth relay to enable the ultraviolet germicidal lamp.

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