CN114353960A - Infrared detection device and air conditioner - Google Patents

Abstract

The invention discloses an infrared detection device and an air conditioner, and relates to the technical field of infrared detection, wherein the infrared detection device comprises: the device comprises at least two infrared sensors, a plurality of comparators and a position detection module; the infrared sensor comprises a lens, and the lens is positioned at the receiving end of the infrared sensor; the lens is divided into at least two detection areas, the infrared penetration rate of each detection area is different, and the direction of a parting line of each infrared sensor for dividing the detection areas is different; the output end of each infrared sensor is respectively connected with the input ends of at least two comparators, and the reference voltages of the at least two comparators are different; the output end of the comparator is connected with the position detection module, and the position detection module is used for outputting the direction of the infrared radiation source corresponding to the output signal of the comparator. The invention realizes the detection of the distribution direction of the human body, does not need to adopt a mechanical rotating structure, has simple structure and easy realization, and reduces the material cost.

Description

Infrared detection device and air conditioner

Technical Field

The invention relates to the technical field of infrared detection, in particular to an infrared detection device and an air conditioner.

Background

At present, with the development of air conditioning technology, people pay more and more attention to the comfort of the air conditioner. An existing air conditioner, such as a central air conditioner, is usually provided with a plurality of air outlets indoors, if each air outlet uniformly supplies air without difference, factors such as heat load distribution and human body distribution in a room are not considered, and indoor environment comfort is easy to cause to be poor, so that air outlet amount control of each air outlet through detecting indoor human body distribution information is very necessary.

The existing indoor human body distribution information detection technology generally uses sensors such as a thermopile array, a camera and a pyroelectric infrared sensor, but the thermopile array or the camera is high in cost, and when the pyroelectric infrared sensor is used, a mechanical rotation sensor is generally adopted for detection, a sensor rotation structure is required, the structure is complex, and the success rate is high.

Disclosure of Invention

In order to solve the problems, the invention provides an infrared detection device and an air conditioner, which realize the detection of the distribution direction of a human body, do not need to adopt a mechanical rotating structure, have simple and easy structure and reduce the material cost.

According to an embodiment of the present invention, in one aspect, an infrared detection apparatus is provided, including: the device comprises at least two infrared sensors, a plurality of comparators and a position detection module; the infrared sensor comprises a lens, and the lens is positioned at a receiving end of the infrared sensor; the lens is divided into at least two detection areas, the infrared penetration rate of each detection area is different, and the direction of a dividing line for dividing the detection areas by each infrared sensor is different; the output end of each infrared sensor is respectively connected with the input ends of at least two comparators, and the reference voltages of the at least two comparators are different; the output end of the comparator is connected with the position detection module, and the position detection module is used for outputting the infrared radiation source direction corresponding to the output signal of the comparator.

Through adopting above-mentioned technical scheme, equally divide into the detection zone that a plurality of penetrability are different with the lens of infrared sensor receiving terminal, can make infrared sensor when detecting the human radiation infrared ray of equidirectional not, the electrical signal of output size difference, through connecting each infrared sensor with the comparator that two at least reference voltage are different, make the comparator correspond the level signal of output difference according to infrared sensor's output signal, the infrared radiation source direction that the comparator output signal of different compound mode of position detection module output corresponds, realized the detection to human body distribution position, need not to adopt mechanical revolution mechanic, and material cost is reduced.

Preferably, the infrared detection device includes two infrared sensors, the infrared sensors are pyroelectric infrared sensors, and the pyroelectric infrared sensors include fly eye lenses, optical filters and pyroelectric elements; the optical filter is arranged between the fly-eye lens and the pyroelectric element and is used for transmitting infrared rays in a preset wavelength range to the pyroelectric element; the fly-eye lens of each pyroelectric infrared sensor is divided into two detection regions, and the division lines of the detection regions of the two infrared sensors form a 90-degree included angle.

Through adopting above-mentioned technical scheme, only set up two pyroelectric infrared sensor, and make two pyroelectric infrared sensor's detection zone parting line be 90 degrees contained angles, can realize the detection to the infrared radiation source of 4 directions, practiced thrift material cost.

Preferably, one of the detection regions of the fly-eye lens is covered with a light-shielding coating.

Through adopting above-mentioned technical scheme, one of them detection zone at fly-eye lens covers there is the shading tectorial membrane, can freely cut apart and set for the detection zone, and the flexibility is high, and the cost is lower, has promoted the convenience that the detection zone set for.

Preferably, an operational amplifier circuit is connected between the infrared sensor and the comparator.

Through adopting above-mentioned technical scheme, be connected the fortune circuit of putting between infrared sensor and comparator, can carry out the amplification to the electrical signal of infrared sensor output to can realize the detection to the small change of infrared radiation source, promote infrared sensor's detection precision.

Preferably, the output end of each pyroelectric infrared sensor is respectively connected with two comparators.

Through adopting above-mentioned technical scheme, be connected pyroelectric infrared sensor and two comparators, can obtain the infrared radiation source direction according to the output level signal of each comparator, promote the accuracy of infrared detection radiation source, adopt less components and parts to realize the infrared radiation source detection of a plurality of directions, practiced thrift material cost.

Preferably, the infrared detection device includes: the output end of the first pyroelectric infrared sensor is respectively connected with the positive phase ends of a first comparator and a second comparator, and the output end of the second pyroelectric infrared sensor is respectively connected with the positive phase ends of a third comparator and a fourth comparator; a first reference voltage of the second comparator and the fourth comparator is less than a first target voltage, and a second reference voltage of the first comparator and the third comparator is greater than the first target voltage and less than a second target voltage; the first target voltage is a positive phase input voltage of the comparator when the infrared radiation source is detected in the detection region covered by the covering film of the fly-eye lens, and the second target voltage is a positive phase input voltage of the comparator when the infrared radiation source is detected in the region uncovered by the fly-eye lens.

By adopting the technical scheme, the corresponding reference voltage is set for each comparator, so that the output level of the comparator can visually reflect the detected infrared radiation source area, the direction of the infrared radiation source can be obtained, and the detection reasonability of the distribution position of the human body is improved.

Preferably, the position detection module is configured to output the direction of the infrared radiation source as a first direction when each comparator outputs a high level; the first direction is a direction corresponding to an area which is not covered by the shading tectorial membrane on each compound eye lens; outputting the direction of the infrared radiation source as a second direction when the first comparator, the second comparator and the fourth comparator all output high levels and the third comparator outputs low levels; the second direction is a direction corresponding to an area which is not covered by the shading coating film on the fly-eye lens of the first pyroelectric infrared sensor and is covered by the shading coating film on the fly-eye lens of the second pyroelectric infrared sensor; outputting the direction of the infrared radiation source as a third direction when the first comparator outputs a low level and the second comparator, the third comparator and the fourth comparator all output a low level; the third direction is a direction corresponding to an area, covered by the fly-eye lens of the first pyroelectric infrared sensor, on the fly-eye lens of the first pyroelectric infrared sensor, not covered by the light-shielding coating film, on the fly-eye lens of the second pyroelectric infrared sensor, and not covered by the light-shielding coating film, on the fly-eye lens of the second pyroelectric infrared sensor; outputting the direction of the infrared radiation source as a fourth direction when the first comparator and the third comparator both output low levels and the second comparator and the fourth comparator both output high levels; the fourth direction is a direction corresponding to an area repeatedly covered by the light-shielding coating film on the fly-eye lens of the first pyroelectric infrared sensor and the fly-eye lens of the second pyroelectric infrared sensor; and outputting that the infrared radiation source is not detected when each comparator outputs a low level.

By adopting the technical scheme, the direction of the infrared radiation source can be rapidly determined according to the output level signals of the comparators, and meanwhile, the accuracy of the detection of the direction of the infrared radiation source is improved.

According to an embodiment of the present invention, there is provided an air conditioner including: the infrared detection device comprises a controller, a shell and the infrared detection device of any one of the first aspect, wherein the shell comprises a shell body and a panel arranged on the bottom surface of the shell body; the infrared detection device is arranged on the panel, and the panel is also provided with an air inlet and a plurality of air outlets; the controller is respectively connected with the infrared detection device and the air outlet, and the controller is used for determining an indoor personnel distribution area according to the direction of the infrared radiation source detected by the infrared detection device and controlling the air output and the air direction of the air outlet.

By adopting the technical scheme, the air outlet quantity and the air direction of the outlet air are controlled according to the direction of the infrared radiation source detected by the infrared detection device, so that the discomfort of a user can be reduced, and the comfort of the user is improved.

Preferably, the detectable direction of the infrared detection device corresponds to the air outlet direction of the air outlet.

Preferably, the air outlets are respectively provided with a wind direction changing plate capable of swinging up and down.

The invention has the following beneficial effects: the lens through with the infrared sensor receiving terminal is equallyd divide into the detection region that a plurality of penetrability are different, can make infrared sensor when detecting the human radiation infrared ray of equidirectional not, the electric signal of output size difference, through connecting each infrared sensor with the comparator that at least two reference voltage are different, make the comparator correspond the level signal of output difference according to infrared sensor, the infrared radiation source direction that the comparator output signal of different compound mode of position detection module output corresponds, realized the detection to human distribution direction, need not to adopt mechanical rotating structure, material cost is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

FIG. 1 is a schematic structural diagram of an infrared detection device according to the present invention;

FIG. 2 is a schematic structural diagram of a pyroelectric infrared sensor provided by the present invention;

FIG. 3 is a top view of a pyroelectric infrared sensor provided by the present invention;

FIG. 4 is a schematic structural diagram of an infrared detection device according to the present invention;

FIG. 5 is a schematic diagram of an output signal of a comparator according to the present invention;

FIG. 6 is a schematic diagram of the direction of an infrared radiation source corresponding to an output signal of a comparator according to the present invention;

FIG. 7 is a schematic structural diagram of an air conditioner according to the present invention;

FIG. 8 is a schematic diagram of a panel structure of an air conditioner according to the present invention;

fig. 9 is a schematic view of an air outlet of an air conditioner according to the present invention;

fig. 10 is a schematic diagram of a detection result of a people distribution area according to the present invention.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

The present embodiment provides an infrared detection device, referring to a schematic structural diagram of the infrared detection device shown in fig. 1, the infrared detection device includes: at least two infrared sensors 11, a plurality of comparators 12, and a position detection module 13.

As shown in fig. 1, the infrared sensor includes a lens 111, and the lens 111 is located at a receiving end of the infrared sensor. The lens 111 is divided into at least two detection areas, the infrared penetration rate of each detection area is different, and the direction of the dividing line of each infrared sensor dividing the detection area is different.

The penetration area of the lens 111 is divided into a plurality of detection areas with different penetration rates, and when the infrared radiation source is positioned in different directions, the electric signals output by the infrared sensor are different due to the different penetration rates of the infrared rays in the detection areas.

The output terminal of each infrared sensor 11 is connected to the input terminals (i.e., positive terminals) of at least two comparators 12, respectively, and the reference voltages of the comparators connected to one infrared sensor are different. The output end of each comparator 12 is connected to a position detection module 13, and the position detection module 13 is configured to output an infrared radiation source direction corresponding to an output signal of the comparator.

Because the comparators output high level when the input voltage of the positive phase end is greater than the reference voltage of the negative phase end, and output low level when the input voltage of the positive phase end is less than the reference voltage of the negative phase end, the position detection module can determine the detection result of each infrared sensor according to the level signal output by each comparator, and further can output the corresponding infrared radiation source direction.

The detection area dividing mode of the lens can be set according to the requirements on the detection direction, for example, when the air conditioner comprises air outlets in two directions, the penetration area of the lens can be divided into two detection areas with different penetration rates so as to detect whether infrared radiation sources exist in the two directions corresponding to the air outlets; when the air outlet in three directions is included, the penetration area of the lens can be divided into three detection areas with different penetration rates so as to detect whether the infrared radiation source exists in the three directions corresponding to the air outlet; when the infrared radiation source is detected in any direction, the output electric signal of one infrared sensor can be distinguished from the electric signals output by other infrared sensors, and then the direction of the infrared radiation source can be determined.

The above-mentioned infrared detection device that this embodiment provided, divide equally into the different detection area of a plurality of penetrability through the lens with the infrared sensor receiving terminal, can make infrared sensor when detecting the human radiation infrared ray in equidirectional not, the electric signal of output size difference, through connecting the different comparator of at least two reference voltages with each infrared sensor, make the comparator correspond the different level signal of output according to infrared sensor's output signal, the infrared radiation source direction that the comparator output signal of position detection module output different compound mode corresponds, the detection to the human body position of distributing has been realized, need not to adopt mechanical revolution mechanic, and material cost is reduced.

In one embodiment, the infrared detection device includes two infrared sensors, which are pyroelectric infrared sensors, as shown in the schematic structural diagram of the pyroelectric infrared sensor shown in fig. 2, and the pyroelectric infrared sensors include a fly eye lens 21, an optical filter 22 and a pyroelectric element 23; the optical filter 22 is disposed between the fly-eye lens 21 and the pyroelectric element 23, and the optical filter 22 is configured to transmit infrared rays in a predetermined wavelength range to the pyroelectric element. When the infrared detector is used for detecting a human body radiation source, the preset wavelength range may be an infrared wavelength range of human body radiation, such as 8.0-10.0 μm, and a preferred value is 9.4 μm.

After passing through the fly eye lens 21, the infrared light enters the pyroelectric element 23 through the optical filter 22 to remove external disturbance light, and a signal is output in accordance with a change in the infrared light. The optical filter 22 is provided to conduct only infrared rays having a wavelength of about 9.4 μm of human body radiation to the pyroelectric element so that the pyroelectric element detects infrared rays having a wavelength of about 9.4 μm of human body radiation. The infrared ray radiated by the human body is detected and output by the pyroelectric element, the output value of the infrared ray from the direction with the detection area with lower light transmittance is lower than that of the infrared ray from the direction with the detection area with higher light transmittance, and the pyroelectric element outputs an electric signal according to the change of the energy of the infrared ray.

Referring to the top view of the pyroelectric infrared sensor shown in fig. 3, the fly eye lens of each pyroelectric infrared sensor is divided into two detection regions, and the detection region dividing lines 31 of the two infrared sensors form an included angle of 90 degrees. The infrared ray penetration rate of the two detection regions is different, and the two pyroelectric infrared sensors are only arranged, so that the detection region dividing lines of the two pyroelectric infrared sensors are 90-degree included angles, the detection of infrared radiation sources in 4 directions can be realized, and the material cost is saved.

In a possible implementation manner, when the detection regions of the lens are set to have different infrared transmittances, different lens materials can be used in different detection regions to achieve different infrared transmittances, and light-shielding film materials with different light-shielding degrees can be covered in the detection regions respectively.

In one embodiment, as shown in fig. 2, one of the detection regions of the fly-eye lens is covered with a light-shielding coating 24. As shown in fig. 2, one of the detection regions of the compound eye lenses of the two pyroelectric infrared sensors is covered with light- shielding coatings 24a and 24b, the light- shielding coatings 24a and 24b may be the same or different light-shielding coatings, and the light-shielding coatings may be formed by printing IR (infrared) ink on one surface of a transparent substrate (such as PC or PET film) and on the other surface, and have infrared transmittance set values that are sufficient to enable the levels of the output signals of the pyroelectric infrared sensors to be different, for example, the electrical signal output by the pyroelectric infrared sensor when the infrared radiation source is detected in the direction of the light-shielding coating is 70% of the electrical signal output by the pyroelectric infrared sensor when the infrared radiation source is detected in the direction of the non-light-shielding coating. One of them detection zone through at fly-eye lens covers there is the shading tectorial membrane, can freely cut apart and set for the detection zone, and the flexibility is high, and the cost is lower, has promoted the convenience that the detection zone set for.

In one embodiment, an op-amp circuit 14 is connected between the infrared sensor and the comparator, as shown in fig. 1. In a specific embodiment, the operational amplifier circuit may include an operational amplifier, and in order to detect a small change of the infrared radiation source, the electrical signal output by the pyroelectric element is amplified by the operational amplifier circuit and input to the comparator in the subsequent stage for voltage comparison.

In one embodiment, the infrared detection device includes two infrared sensors, and when the fly eye lens of each pyroelectric infrared sensor is divided into two detection regions, the output end of each pyroelectric infrared sensor is connected to two comparators respectively. Through being connected pyroelectric infrared sensor and two comparators, can obtain the infrared radiation source direction according to the output level signal of each comparator, promote the accuracy of infrared detection radiation source, adopt less components and parts to realize the infrared radiation source of a plurality of directions and survey, practiced thrift material cost.

In one embodiment, referring to the schematic structural diagram of the infrared detection device shown in fig. 4, the two pyroelectric infrared sensors included in the infrared detection device are respectively referred to as a first pyroelectric infrared sensor and a second pyroelectric infrared sensor, and the output terminal of the first pyroelectric infrared sensor 41 of the infrared detection device is respectively connected to the positive phase terminals of the first comparator 431 and the second comparator 432, and the output terminal of the second pyroelectric infrared sensor 42 is respectively connected to the positive phase terminals of the third comparator 433 and the fourth comparator 434.

The first reference voltages of the second and fourth comparators 432 and 434 are less than the first target voltage, and the second reference voltages of the first and third comparators 431 and 433 are greater than the first target voltage and less than the second target voltage; the first target voltage is the input voltage of the positive phase end of the comparator when the tectorial membrane covered detection area of the fly-eye lens detects the infrared ray radiated by the human body, and the second target voltage is the input voltage of the positive phase end of the comparator when the uncovered tectorial membrane detection area of the fly-eye lens detects the infrared ray radiated by the human body.

Referring to the schematic diagram of the output signals of the comparator shown in fig. 5, the peak value of the voltage signal output by the pyroelectric infrared sensor when the detection area covered by the fly eye lens without the light-shielding film detects infrared radiation from the human body is set as the first target voltage x1, the peak value of the voltage signal output by the pyroelectric infrared sensor when the detection area covered by the fly eye lens with the light-shielding film detects infrared radiation from the human body is set as the second target voltage x2, the second reference voltage of the first comparator 431 and the third comparator 433 is set to a value greater than x2 and less than x1, and the first reference voltage is set to a value less than x 2.

When the fly-eye lens is not covered by the shading film and detects infrared rays radiated by a human body, the peak value of a voltage signal output by the electricity-releasing infrared sensor is larger than the second reference voltage, and 4 comparators have high-level output.

When the fly-eye lens is covered by the light-shielding coating film and the detection area detects infrared rays radiated by a human body, the peak value of a voltage signal output by the pyroelectric infrared sensor is larger than a first reference voltage but smaller than a second reference voltage, no high-level signal is output by the first comparator 431 and the third comparator 433, and high-level signals are output by the second comparator 432 and the fourth comparator 434.

Through setting up corresponding reference voltage for each comparator, make the output level of comparator can the audio-visual reflection detect infrared radiation source region, and then can obtain infrared radiation source's direction of place, promoted the rationality that human body distributes the position and detects.

In one embodiment, the position detection module is configured to output the direction of the infrared radiation source as a first direction when each comparator outputs a high level; the first direction is a direction corresponding to an area which is not covered by the shading tectorial membrane on the two fly-eye lenses.

The position detection module outputs the direction of the infrared radiation source to be a second direction when the first comparator, the second comparator and the fourth comparator output high levels and the third comparator outputs low levels; the second direction is a direction corresponding to an area which is not covered on the fly-eye lens of the first pyroelectric infrared sensor and is covered by the shading coating film on the fly-eye lens of the second pyroelectric infrared sensor.

The position detection module outputs the direction of the infrared radiation source to be a third direction when the first comparator outputs a low level and the second comparator, the third comparator and the fourth comparator all output a low level; the third direction is a direction corresponding to a region covered on the fly-eye lens of the first pyroelectric infrared sensor and not covered by the light-shielding coating film on the fly-eye lens of the second pyroelectric infrared sensor.

The position detection module outputs the direction of the infrared radiation source to be a fourth direction when the first comparator and the third comparator output low levels and the second comparator and the fourth comparator output high levels; the fourth direction is a direction corresponding to an area repeatedly covered by the light-shielding coating film on the fly-eye lens of the first pyroelectric infrared sensor and the fly-eye lens of the second pyroelectric infrared sensor.

The position detection module outputs the direction of the infrared radiation source which is not detected when each comparator outputs low level.

In a specific embodiment, when the covering direction of the light-shielding coating on the fly-eye lens of the pyroelectric infrared sensor is as shown in fig. 3, that is, the center of the fly-eye lens is taken as the origin, and the horizontal direction is taken as the x axis, the split line function of the fly-eye lens of the first pyroelectric infrared sensor is y ═ x, the split line function of the fly-eye lens of the second pyroelectric infrared sensor is y ═ x, the light-shielding coating coverage area of the first pyroelectric infrared sensor is the lower area of the split line, the light-shielding coating coverage area of the second pyroelectric infrared sensor is the upper area of the split line, and the split lines of the two pyroelectric infrared sensors form an angle of 90 degrees.

When the detection area of the fly-eye lens is divided as shown in fig. 3, the direction of the infrared radiation source output by the position detection module is shown as 6:

when the first comparator, the second comparator, the third comparator and the fourth comparator all output high levels, it indicates that the infrared radiation source is detected in the detection region that is not covered by the light-shielding coating, as shown in fig. 6, the position detection module outputs that the direction of the infrared radiation source is a first direction a, which is the direction that can be detected by the detection region that is not covered by the light-shielding coating in fig. 3.

When the third comparator has no high level output and the first comparator, the second comparator and the fourth comparator all have high level outputs, it indicates that the detection region covered by the light-shielding coating film on the fly-eye lens of the second pyroelectric infrared sensor detects the infrared radiation source, and the detection region where the first pyroelectric infrared sensor can detect the infrared radiation source in the direction is a detection region not covered by the light-shielding coating film, as shown in fig. 6, the position detection module outputs that the direction of the infrared radiation source is a second direction b, which is a direction that the detection region on the fly-eye lens of the first pyroelectric infrared sensor in fig. 3 that is not covered by the light-shielding coating film and that is covered by the light-shielding coating film on the fly-eye lens of the second pyroelectric infrared sensor can detect.

When the first comparator has no high level output and the second comparator, the third comparator and the fourth comparator all have high level output, indicating that the infrared radiation source is detected in the detection area covered by the shading covering film on the fly-eye lens of the first pyroelectric infrared sensor, and the detection area of the infrared radiation source in the direction which can be detected by the second pyroelectric infrared sensor is the detection area which is not covered by the shading covering film, as shown in fig. 6, the direction of the infrared radiation source output by the position detection module is a third direction c, where the third direction c is a direction that can be detected by a detection region, which is covered by the fly-eye lens of the first pyroelectric infrared sensor on the fly-eye lens of the first pyroelectric infrared sensor in fig. 3, and is not covered by the light-shielding coating film on the fly-eye lens of the second pyroelectric infrared sensor.

When the first comparator and the third comparator have no high level output, and the second comparator and the fourth comparator both have high level outputs, it indicates that the detection region covered by the light-shielding coating film on the fly-eye lens of the first pyroelectric infrared sensor detects the infrared radiation source, and the detection region in the direction that the second pyroelectric infrared sensor can detect the infrared radiation source is also the detection region covered by the light-shielding coating film, as shown in fig. 6, the direction of the infrared radiation source output by the position detection module is a fourth direction d, which is the direction that the detection regions repeatedly covered by the light-shielding coating film on the fly-eye lens of the first pyroelectric infrared sensor and on the fly-eye lens of the second pyroelectric infrared sensor in fig. 3 can detect.

When the first comparator, the second comparator, the third comparator and the fourth comparator have no high level output, it is indicated that all detection regions detect infrared radiation sources, and the position detection module outputs no infrared radiation sources.

According to the above, the output level signals of the comparators in different combinations correspond to different directions of the infrared radiation source. When the detection region dividing lines on the fly eye lenses of the first pyroelectric infrared sensor and the second pyroelectric infrared sensor rotate, the output result of the position detection module correspondingly changes.

In a possible implementation manner, the position detection module may store a table of correspondence between the output signals of the comparators and the directions of the infrared radiation sources as shown in fig. 6, so that the position detection module may correspondingly output different detection results according to the output level signals of the comparators in different combinations; the position detection module can also comprise a digital comparison circuit or a NAND gate logic circuit, so that the position detection module can correspondingly output different numbers by the comparator output level signals under different combinations, and each number correspondingly has one direction. For example, the position detection module includes two and circuits, the first comparator and the second comparator are connected to an input terminal of one and circuit, the third comparator and the fourth comparator are connected to an input terminal of the other and circuit, and when the first and circuit outputs 1 and the second and circuit outputs 0, 10 indicates the second direction.

The above-mentioned infrared detection device that this embodiment provided can use a small amount of low-cost sensor to realize the detection to human body distribution direction, need not to adopt mechanical revolution mechanic, has practiced thrift material cost, and adopts the circuit form to detect, and detection efficiency is high.

Corresponding to the infrared detection device provided in the above embodiment, an embodiment of the present invention provides an air conditioner, which may be a central air conditioner, an indoor unit of the air conditioner is a patio installation type indoor unit, see a schematic structural diagram of the air conditioner shown in fig. 7, and the air conditioner includes: the controller (not shown in the figures), the housing 70 and the infrared detection device 10 provided in the above embodiment, as shown in fig. 7, the housing 70 includes a housing body 71 and a panel 72 disposed on a bottom surface of the housing; the infrared detection device 10 is arranged on the panel 72; the panel 72 is also provided with an air inlet 73 and a plurality of air outlets 74a to 74 d.

The controller is respectively connected with the infrared detection device and the air outlet, and the controller is used for determining indoor personnel distribution areas according to the direction of the infrared radiation source detected by the infrared detection device and controlling the air output and the air direction of the air outlet. For example, when the infrared radiation source that infrared detection device detected is in the first direction, control blows to the air output and the wind direction of the air outlet of first direction, realizes directly blowing or avoiding the human control mode of blowing to the human body, reduces user's uncomfortable and feels, has improved user's travelling comfort.

In one embodiment, as shown in fig. 7, the air outlets 74a to 74d of the air conditioner are respectively provided with air direction changing plates 75a to 75d which can swing up and down. The wind direction changing plate can adjust the vertical wind swinging angle of each air outlet, thereby adjusting the wind blowing angle of the air outlet. The airflow direction changing plates 75a to 75d have a long and narrow plate-like structure extending along the longitudinal direction of the outlet. The wind direction changing plates are driven by a driving motor to change the wind direction in the vertical direction independently.

In one embodiment, the detectable direction of the infrared detection device corresponds to the air outlet direction of the air outlet. Referring to the schematic structural diagram of the air conditioner panel shown in fig. 8, the detectable directions of the infrared detection device 10 include a first direction a, a second direction b, a third direction c and a fourth direction d, the first direction a, the second direction b, the third direction c and the fourth direction d are respectively corresponding to the air outlet directions of the air outlets 74a to 74d of the air conditioner (i.e., the directions of arrows of the air outlets in fig. 8), and the infrared detection device 10 may be disposed at any position on the panel where the human body direction can be detected.

In practical application, the environment where the outdoor unit of the air conditioner is located can be divided into A, B, C, D four areas for personnel detection, so that the air outlet direction and the air outlet volume of each air outlet can be correspondingly controlled. Referring to the schematic air-out view of the air conditioner shown in fig. 9, fig. 9 shows the air-out areas a ', B', C ', D' that the air flow blown out from each outlet of the indoor unit of the air conditioner equipped with the infrared detection device can reach, and a top view of the detection area A, B, C, D of the infrared detection device.

Taking the fly-eye lens detection area division manner shown in fig. 3 as an example, the people distribution area in the room is determined according to the detection results of the comparators, see the people distribution area detection results shown in fig. 10:

when the first comparator, the second comparator, the third comparator and the fourth comparator all have high-level outputs, the infrared detection device outputs that the direction of the infrared radiation source is a first direction a, and the personnel distribution area is determined to be an area A.

When the third comparator has no high level output and the first comparator, the second comparator and the fourth comparator have high level output, the infrared detection device outputs that the direction of the infrared radiation source is the second direction B, and the personnel distribution area is determined to be the area B.

When the first comparator has no high level output and the second comparator, the third comparator and the fourth comparator have high level output, the infrared detection device outputs that the direction of the infrared radiation source is a third direction C, and the personnel distribution area is determined to be an area C.

When the first comparator and the third comparator have no high level output and the second comparator and the fourth comparator both have high level output, the infrared detection device outputs that the direction of the infrared radiation source is a fourth direction D, and the personnel distribution area is determined to be a D area.

When the first comparator, the second comparator, the third comparator and the fourth comparator are all free of high level output, the infrared detection device outputs a non-infrared radiation source, and it is determined that no person is distributed indoors.

Through the personnel distribution region in the detection chamber, can carry out air-out control to the region that has personnel to distribute, for example, when detecting personnel distribution region and be A region, can control air outlet 74a and blow to the air output and/or the air-out angle in A' region, control directly blow to human or control and avoid the human body to blow, promoted user experience. When no personnel distribution in a certain area or no personnel distribution in a room is detected, the corresponding air outlet can be controlled to pause air outlet or reduce air outlet quantity, and the energy consumption of the air conditioner is saved.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. An infrared detection device, comprising: the device comprises at least two infrared sensors, a plurality of comparators and a position detection module;

the infrared sensor comprises a lens, and the lens is positioned at a receiving end of the infrared sensor;

the lens is divided into at least two detection areas, the infrared penetration rate of each detection area is different, and the direction of a dividing line for dividing the detection areas by each infrared sensor is different;

the output end of each infrared sensor is respectively connected with the input ends of at least two comparators, and the reference voltages of the at least two comparators are different;

the output end of the comparator is connected with the position detection module, and the position detection module is used for outputting the infrared radiation source direction corresponding to the output signal of the comparator.

2. The infrared detection device as claimed in claim 1, wherein the infrared detection device comprises two infrared sensors, the infrared sensors are pyroelectric infrared sensors, and the pyroelectric infrared sensors comprise fly eye lenses, optical filters and pyroelectric elements;

the optical filter is arranged between the fly-eye lens and the pyroelectric element and is used for transmitting infrared rays in a preset wavelength range to the pyroelectric element;

the fly-eye lens of each pyroelectric infrared sensor is divided into two detection regions, and the division lines of the detection regions of the two infrared sensors form a 90-degree included angle.

3. The infrared detection device as set forth in claim 2, wherein one of the detection areas of the fly-eye lens is covered with a light-shielding coating.

4. The infrared detection device as claimed in claim 1, wherein an operational amplifier circuit is connected between the infrared sensor and the comparator.

5. The infrared detecting device as claimed in claim 2, wherein the output terminal of each pyroelectric infrared sensor is connected to two comparators.

6. The infrared detection device as set forth in claim 5, comprising: the output end of the second pyroelectric infrared sensor is respectively connected with the positive phase end of the third comparator and the positive phase end of the fourth comparator;

a first reference voltage of the second comparator and the fourth comparator is less than a first target voltage, and a second reference voltage of the first comparator and the third comparator is greater than the first target voltage and less than a second target voltage; the first target voltage is a positive phase input voltage of the comparator when the infrared radiation source is detected in the detection region covered by the covering film of the fly-eye lens, and the second target voltage is a positive phase input voltage of the comparator when the infrared radiation source is detected in the region uncovered by the fly-eye lens.

7. The infrared detecting device as claimed in claim 6, wherein the position detecting module is configured to output the direction of the infrared radiation source as a first direction when each comparator outputs a high level; the first direction is a direction corresponding to an area which is not covered by the shading tectorial membrane on each compound eye lens;

outputting the direction of the infrared radiation source as a second direction when the first comparator, the second comparator and the fourth comparator all output high levels and the third comparator outputs low levels; the second direction is a direction corresponding to an area which is not covered by the shading coating film on the fly-eye lens of the first pyroelectric infrared sensor and is covered by the shading coating film on the fly-eye lens of the second pyroelectric infrared sensor;

outputting the direction of the infrared radiation source as a third direction when the first comparator outputs a low level and the second comparator, the third comparator and the fourth comparator all output a low level; the third direction is a direction corresponding to an area, covered by the fly-eye lens of the first pyroelectric infrared sensor, on the fly-eye lens of the first pyroelectric infrared sensor, not covered by the light-shielding coating film, on the fly-eye lens of the second pyroelectric infrared sensor, and not covered by the light-shielding coating film, on the fly-eye lens of the second pyroelectric infrared sensor;

outputting the direction of the infrared radiation source as a fourth direction when the first comparator and the third comparator both output low levels and the second comparator and the fourth comparator both output high levels; the fourth direction is a direction corresponding to an area repeatedly covered by the light-shielding coating film on the fly-eye lens of the first pyroelectric infrared sensor and the fly-eye lens of the second pyroelectric infrared sensor;

and outputting that the infrared radiation source is not detected when each comparator outputs a low level.

8. An air conditioner, comprising: the infrared detection device of any one of claims 1-7, the casing comprises a casing body and a panel arranged on the bottom surface of the casing body;

the infrared detection device is arranged on the panel, and the panel is also provided with an air inlet and a plurality of air outlets;

the controller is respectively connected with the infrared detection device and the air outlet, and the controller is used for determining an indoor personnel distribution area according to the direction of the infrared radiation source detected by the infrared detection device and controlling the air output and the air direction of the air outlet.

9. The air conditioner as claimed in claim 8, wherein the detectable direction of the infrared detecting device corresponds to the air outlet direction of the air outlet.

10. The air conditioner according to claim 8, wherein the air outlets are respectively provided with air direction changing plates which can swing up and down.

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