A passive infrared induction type ultraviolet disinfection device

Abstract

The present invention discloses a passive infrared induction type ultraviolet disinfection device, comprising: a plurality of passive infrared detectors for monitoring a target area, a driving circuit for an ultraviolet disinfection lamp, an ultraviolet disinfection lamp connected to the second end of the driving circuit for the ultraviolet disinfection lamp, and a central processing unit respectively connected to the first ends of each passive infrared detector and the driving circuit for the ultraviolet disinfection lamp, and used for controlling the driving circuit for the ultraviolet disinfection lamp to turn off the ultraviolet disinfection lamp after the passive infrared detector detects that a target object passes through the target area. By arranging a plurality of passive infrared detectors to monitor the target area, the overall monitoring range of the passive infrared induction type ultraviolet disinfection device is effectively expanded, the monitoring ability for the target area is improved, so that it can more accurately monitor whether there is a person breaking into the target area, reduce the situation that the ultraviolet disinfection lamp is not turned off after a person breaks in by mistake, and improve the safety factor of the ultraviolet disinfection lamp.

Description

Technical Field

[0001] The present invention relates to the field of monitoring technologies, and particularly to a passive infrared induction type ultraviolet disinfection device. Background Art

[0002] Ultraviolet disinfection lamps, also known as ultraviolet germicidal lamps and ultraviolet fluorescent lamps, are lamps that use the germicidal effect of ultraviolet rays for sterilization and disinfection. By radiating ultraviolet rays outward, they can be used for disinfection and sterilization of water, air, clothes, etc. To improve public health safety, it is a major trend to install ultraviolet disinfection lamps in many places for regular disinfection. During the disinfection process of ultraviolet disinfection lamps, it is usually necessary for personnel to leave the scene to avoid harmful radiation. However, in many public places, it is inevitable that someone will accidentally enter the area where ultraviolet disinfection is in progress. Therefore, it is necessary to turn off the ultraviolet disinfection lamp after detecting the entry of personnel.

[0003] Existing ultraviolet disinfection lamps usually do not have a human body detection function. A feasible method is to install a passive infrared detector. However, the detection angle range of the passive infrared detector in the prior art is narrow, and it is prone to false negative problems, and it cannot effectively turn off the ultraviolet disinfection lamp when someone accidentally enters, resulting in potential safety hazards. Summary of the Invention

[0004] The purpose of the present invention is to provide a passive infrared induction type ultraviolet disinfection device, which improves the detection ability of the area, ensures that the ultraviolet disinfection lamp is turned off when someone accidentally enters, and improves the safety factor of the ultraviolet disinfection lamp.

[0005] To solve the above technical problems, the present invention provides a passive infrared induction type ultraviolet disinfection device, including: a plurality of passive infrared detectors for monitoring a target area, an ultraviolet disinfection lamp driving circuit, an ultraviolet disinfection lamp connected to the second end of the ultraviolet disinfection lamp driving circuit, and a central processing unit respectively connected to the first ends of each of the passive infrared detectors and the ultraviolet disinfection lamp driving circuit, and configured to control the ultraviolet disinfection lamp driving circuit to turn off the ultraviolet disinfection lamp after the passive infrared detector detects that a target object passes through the target area.

[0006] Optionally, the central processing unit controls the ultraviolet disinfection lamp driving circuit to turn off the ultraviolet disinfection lamp after the passive infrared detector detects a target object, specifically as follows:

[0007] After the central processing unit receives signals that a preset number of the passive infrared detectors detect the target object, it determines that the target object passes through the target area, and controls the ultraviolet disinfection lamp driving circuit to turn off the ultraviolet disinfection lamp.

[0008] Optionally, the number of the passive infrared detectors is specifically three.

[0009] Optionally, the three passive infrared detectors are located on the same straight line, and the two passive infrared detectors at both ends form an angle of 30° with the straight line to form a detection angle of 180°.

[0010] Optionally, the passive infrared detector is specifically a pyroelectric sensor.

[0011] Optionally, it further includes a UV disinfection lamp switch connected to the central processor.

[0012] Optionally, it further includes an alarm connected to the central processor.

[0013] Optionally, it further includes a UV irradiance detection circuit connected to the central processor.

[0014] Optionally, the UV irradiance detection circuit specifically includes a short-wave sterilizing UV band detection probe and an amplification circuit;

[0015] The short-wave sterilizing UV band detection probe is installed in the radiation area of the UV disinfection lamp. The first end of the amplification circuit is connected to the output end of the short-wave sterilizing UV band detection probe, and the second end of the amplification circuit is connected to the central processor.

[0016] Optionally, the central processor is further configured to fit the light decay curve of the UV disinfection lamp according to the detection results of the UV irradiance detection circuit within a preset time period, and determine the remaining life of the UV disinfection lamp according to the light decay curve.

[0017] The passive infrared induction type UV disinfection device provided by the present invention includes: a plurality of passive infrared detectors for monitoring a target area, a UV disinfection lamp driving circuit, a UV disinfection lamp connected to the second end of the UV disinfection lamp driving circuit, and a central processor respectively connected to the first ends of each passive infrared detector and the UV disinfection lamp driving circuit, and configured to control the UV disinfection lamp driving circuit to turn off the UV disinfection lamp after the passive infrared detector detects that a target object passes through the target area. By arranging a plurality of passive infrared detectors to monitor the target area, the overall monitoring range of the passive infrared induction type UV disinfection device is effectively expanded, the monitoring ability of the target area is improved, so that it can more accurately monitor whether there are people breaking into the target area, reduce the situation that the UV disinfection lamp is not turned off after people break in by mistake, and improve the safety factor of the UV disinfection lamp. Description of the Drawings

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic structural diagram of a passive infrared induction type ultraviolet disinfection device provided by an embodiment of the present invention;

[0020] Figure 2 It is a circuit diagram of a central processing unit provided by an embodiment of the present invention;

[0021] Figure 3(a) is a circuit diagram of a first passive infrared detector provided by an embodiment of the present invention;

[0022] Figure 3(b) is a circuit diagram of a second passive infrared detector provided by an embodiment of the present invention;

[0023] Figure 3(c) is a circuit diagram of a third passive infrared detector provided by an embodiment of the present invention;

[0024] Figure 4 It is a circuit diagram of an ultraviolet disinfection lamp drive circuit provided by an embodiment of the present invention;

[0025] Figure 5 It is a circuit diagram of a buzzer provided by an embodiment of the present invention;

[0026] Figure 6 It is a schematic structural diagram of another passive infrared induction type ultraviolet disinfection device provided by an embodiment of the present invention;

[0027] Figure 7 It is a circuit diagram of a short-wave sterilizing ultraviolet band detection probe provided by an embodiment of the present invention;

[0028] Figure 8 It is a circuit diagram of an amplifier circuit provided by an embodiment of the present invention;

[0029] Among them, 101 is a passive infrared detector, 102 is an ultraviolet disinfection lamp drive circuit, 103 is an ultraviolet disinfection lamp, 104 is a central processing unit, 105 is an ultraviolet disinfection lamp switch, 106 is an alarm, 107 is a display, 108 is a touch button, 109 is a memory, 110 is a short-wave sterilizing ultraviolet band detection probe, 111 is an amplifier circuit, and 112 is a wireless communicator. Detailed implementation manners

[0030] The core of the present invention is to provide a passive infrared induction type ultraviolet disinfection device, which improves the detection ability of the area, ensures that the ultraviolet disinfection lamp is turned off when a person breaks in by mistake, and improves the safety factor of the ultraviolet disinfection lamp.

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0032] Figure 1 It is a schematic structural diagram of a passive infrared induction type ultraviolet disinfection device provided by an embodiment of the present invention; Figure 2 It is a circuit diagram of a central processing unit provided by an embodiment of the present invention; FIG. 3(a) is a circuit diagram of a first passive infrared detector provided by an embodiment of the present invention; FIG. 3(b) is a circuit diagram of a second passive infrared detector provided by an embodiment of the present invention; FIG. 3(c) is a circuit diagram of a third passive infrared detector provided by an embodiment of the present invention; Figure 4 It is a circuit diagram of an ultraviolet disinfection lamp drive circuit provided by an embodiment of the present invention; Figure 5 It is a circuit diagram of a buzzer provided by an embodiment of the present invention.

[0033] As Figure 1 shown, the passive infrared induction type ultraviolet disinfection device provided by the embodiment of the present invention includes: a plurality of passive infrared detectors 101 for monitoring a target area, an ultraviolet disinfection lamp drive circuit 102, an ultraviolet disinfection lamp 103 connected to the second end of the ultraviolet disinfection lamp drive circuit 102, and a central processing unit 104 respectively connected to the first ends of each passive infrared detector 101 and the ultraviolet disinfection lamp drive circuit 102, and used to control the ultraviolet disinfection lamp drive circuit 102 to turn off the ultraviolet disinfection lamp 103 after the passive infrared detector 101 detects that a target object passes through the target area.

[0034] To ensure that the ultraviolet disinfection lamp 103 that is disinfecting is turned off before a person enters the disinfection area of the ultraviolet disinfection lamp 103, the target area is selected in an area where there is a possibility of people passing by near the disinfection area of the ultraviolet disinfection lamp 103.

[0035] The passive infrared sensor-based ultraviolet disinfection device provided by the embodiments of the present invention can increase the detection range compared with a single passive infrared detector 101 by setting multiple passive infrared detectors 101 for monitoring a target area, and can achieve area human body monitoring. According to the area and spatial form of the target area, the number and arrangement mode of the passive infrared detectors 101 are set. If there are multiple target areas near the disinfection area of the ultraviolet disinfection lamp 103, multiple groups of passive infrared detectors 101 can be set, and each group includes multiple passive infrared detectors 101.

[0036] The passive infrared detector 101 can specifically adopt a pyroelectric sensor. A pyroelectric sensor is a sensor used to convert human body infrared radiation into electric energy. In order to extend the detection distance of the passive infrared detector 101, an optical system can be added to collect infrared radiation, and usually a plastic-coated metal optical reflection system or a Fresnel lens made of plastic is used as the focusing system for infrared radiation.

[0037] After a person passes through the target area, the passive infrared detector 101 detects a changing infrared signal until it disappears, and then it is considered that the passive infrared detector 101 has detected a target object. Due to the different movement trajectories of the target objects, the detection results of each passive infrared detector 101 may be different. Combining the detection results of each passive infrared detector 101 helps to reduce the probability of misdetecting the target object. Therefore, after the passive infrared detector 101 detects a target object, the central processing unit 104 controls the ultraviolet disinfection lamp drive circuit 102 to turn off the ultraviolet disinfection lamp 103. Specifically, it can be:

[0038] After the central processing unit 104 receives the signals that a preset number of passive infrared detectors 101 have detected a target object, it determines that the target object has passed through the target area and controls the ultraviolet disinfection lamp drive circuit 102 to turn off the ultraviolet disinfection lamp 103.

[0039] The number of the passive infrared detectors 101 can be set to three. An optional installation method is as Figure 1 shown. The three passive infrared detectors 101 are located on the same straight line, and the two passive infrared detectors 101 at both ends form a 30° angle with the straight line to form a 180° detection angle. Optionally, when and only when two passive infrared detectors 101 detect a target object, it is considered that a person has passed through the target area, and the central processing unit 104 controls the ultraviolet disinfection lamp drive circuit 102 to turn off the ultraviolet disinfection lamp 103, otherwise it does not act, which can effectively solve the false triggering caused by the disturbance of a single passive infrared detector 101.

[0040] Taking the number of the passive infrared detectors 101 set to three as an example, as Figure 2As shown in the figure, the central processing unit 104 selects a micro control unit MCU; Pin 1, Pin 36, and Pin 48 (VBAT, VDD, VDD) of the micro control unit MCU U14 are respectively connected to a 3.3V DC power supply; Pins 2, 3, 4, and 11 (PC13 - TEMPER - RTC, PC14 - OSC32 - I, PC15 - OSC32 - O, PA1) of the micro control unit MCU U14 are used to connect to the memory 109; Pins 5 and 6 (PD0 - OSC_IN, PD1 - OSC_OUT) of the micro control unit MCU U14 are used to connect to the crystal oscillator; Pin 7 (NRST) of the micro control unit MCU U14 is used to connect to the reset circuit; Pin 8 (VSSA - VREF -) of the micro control unit MCU U14 is grounded; Pin 9 (VDDA - VREF +) of the micro control unit MCU U14 is connected to a 3.3V DC power supply as the reference voltage; Pin 10 (PA0 - WKUP) of the micro control unit MCU U14 is connected to the watchdog circuit; Pin 12 (PA2) of the micro control unit MCU U14 is used to connect to the brake control circuit; Pin 14 (PA4) of the micro control unit MCU U14 is used to connect to the ultraviolet disinfection lamp drive circuit 102; Pins 27, 28, and 29 (PB14, PB15, PA8) of the micro control unit MCU U14 are respectively connected to the signal output ends of three passive infrared detectors 101; Pins 43, 45, and 46 (8025INT, 8025SDA, 8025SCL) of the micro control unit MCU U14 are connected to the clock chip.

[0041] As shown in FIGS. 3(a), 3(b), and 3(c), among the three passive infrared detectors 101, the first passive infrared detector 101PIR1 (Passive infrared detectors) is connected to chip U6, and the output signal PIR - OUT1 of chip U6 is connected to Figure 2 Pin 27 (PB14) of the micro control unit MCU U14 in Figure 2 ; The second passive infrared detector 101PIR2 is connected to chip U7, and the output signal PIR - OUT2 of chip U7 is connected to Figure 2 Pin 28 (PB15) of the micro control unit MCU U14 in

[0042] As Figure 4 shown, the ultraviolet drive circuit is built by the connector P3 and the relay K1. The first end of the resistor R49 is connected to Figure 2Pin 14 (PA4) of the microcontroller MCU U14 is connected to the second end of resistor R49 and the base of transistor Q1. The microcontroller MCU U14 sends a JDQ-O signal to transistor Q1 to turn it on, enabling the control terminal of relay K1 to be powered, closing the switch of relay K1, and turning on ultraviolet disinfection lamp 103. By controlling the duty cycle of the JDQ-O signal to turn on transistor Q1, outputs with different radiation intensities are achieved.

[0043] As Figure 1 shown, the passive infrared induction type ultraviolet disinfection device provided by an embodiment of the present invention may further include an ultraviolet disinfection lamp switch 105 connected to the central processing unit 104. This ultraviolet disinfection lamp switch 105 provides the option for personnel to turn the ultraviolet disinfection lamp 103 on and off. When the ultraviolet disinfection lamp 103 is in the working state, personnel turn off the ultraviolet disinfection lamp switch 105 to pause the operation of the ultraviolet disinfection lamp 103. The ultraviolet disinfection lamp switch 105 is connected to Figure 2 pin 21 (PB10) of the microcontroller MCU U14.

[0044] As Figure 1 shown, the passive infrared induction type ultraviolet disinfection device provided by an embodiment of the present invention may further include an alarm 106 connected to the central processing unit 104. Correspondingly, after the central processing unit 104 determines that a target object has passed through the target area, it controls the alarm 106 to give an alarm. The alarm 106 can select a buzzer. As Figure 5 shown, the buzzer circuit includes buzzer BZ1 and a buzzer drive circuit. The first end of resistor R58 is connected to Figure 2 pin 13 (PA3) of the microcontroller MCU U14, and the second end of resistor R58 is connected to the base of transistor Q2. The microcontroller MCU U14 controls the operation of buzzer BZ1 by sending a BZ1 signal to the base of transistor Q2.

[0045] As Figure 1 shown, the passive infrared induction type ultraviolet disinfection device provided by an embodiment of the present invention may further include a display 107 connected to the central processing unit 104. Correspondingly, the central processing unit 104 is also used to control the display 107 to display parameters such as the disinfection level (obtained by converting the wavelength of the irradiated ultraviolet light) and disinfection duration of the ultraviolet disinfection lamp 103. The display 107 can select a digital tube for parameter display, or an LCD display screen to display more complex data.

[0046] Correspondingly, the passive infrared induction type ultraviolet disinfection device provided by an embodiment of the present invention further includes a touch button 108 connected to the central processing unit 104, which is used to receive the working parameters of the ultraviolet disinfection lamp 103 input by the staff, such as the disinfection level, disinfection duration, etc.

[0047] As Figure 1 shown, the passive infrared induction type ultraviolet disinfection device provided by the embodiment of the present invention may further include a memory 109 connected to the central processing unit 104. Correspondingly, the central processing unit 104 may store the historical working records of the ultraviolet disinfection lamp 103, the records of the target objects detected by the passive infrared detectors 101 passing through the target area, etc. in the memory 109 for the staff to view.

[0048] Using the passive infrared induction type ultraviolet disinfection device provided by the embodiment of the present invention, the staff inputs the working parameters of the ultraviolet disinfection lamp 103 through the touch key 108, and the central processing unit 104 controls the ultraviolet disinfection lamp driving circuit 102 to drive the ultraviolet disinfection lamp 103 to perform ultraviolet disinfection work on the disinfection area of the ultraviolet disinfection lamp 103; the central processing unit 104 receives the detection signals of the passive infrared detectors 101, and according to the preset target determination conditions, when it is determined that there is a target object passing through the target area, the central processing unit 104 controls the ultraviolet disinfection lamp driving circuit 102 to turn off the ultraviolet disinfection lamp 103. If the ultraviolet disinfection lamp switch 105 is not turned off within the preset time (such as 10 s), the ultraviolet disinfection lamp 103 is turned on to continue the disinfection work until the preset disinfection duration is reached.

[0049] The passive infrared induction type ultraviolet disinfection device provided by the embodiment of the present invention includes: a plurality of passive infrared detectors for monitoring the target area, an ultraviolet disinfection lamp driving circuit, an ultraviolet disinfection lamp connected to the second end of the ultraviolet disinfection lamp driving circuit, and a central processing unit respectively connected to the first ends of the passive infrared detectors and the ultraviolet disinfection lamp driving circuit, which is used to control the ultraviolet disinfection lamp driving circuit to turn off the ultraviolet disinfection lamp after the passive infrared detector detects that a target object passes through the target area. By arranging a plurality of passive infrared detectors to monitor the target area, the overall monitoring range of the passive infrared induction type ultraviolet disinfection device is effectively expanded, the monitoring ability of the target area is improved, so that it can more accurately monitor whether there are people breaking into the target area, reduce the situation that the ultraviolet disinfection lamp is not turned off after people break in by mistake, and improve the safety factor of the ultraviolet disinfection lamp.

[0050] Figure 6 is a schematic structural diagram of another passive infrared induction type ultraviolet disinfection device provided by the embodiment of the present invention; Figure 7 is a circuit diagram of a short-wave sterilizing ultraviolet band detection probe provided by the embodiment of the present invention; Figure 8 is a circuit diagram of an amplifier circuit provided by the embodiment of the present invention.

[0051] The lifespan of the ultraviolet disinfection lamp 103 is limited. During daily use, to avoid the situation where the ultraviolet disinfection lamp 103 reaches the end of its lifespan without being replaced, a mechanism for monitoring the lifespan of the ultraviolet disinfection lamp 103 needs to be set up. In the prior art, the on-time of the ultraviolet disinfection lamp 103 is often used to calculate the lifespan of the ultraviolet disinfection lamp 103. However, due to the differences in the usage scenarios of the ultraviolet disinfection lamp 103 and the performance of the ultraviolet disinfection lamp 103 itself, the prediction results of this method for predicting the lifespan of the ultraviolet disinfection lamp 103 are often inaccurate, which may lead to the problem that the ultraviolet disinfection lamp 103 cannot be replaced in time.

[0052] Therefore, on the basis of the above embodiments, as Figure 6 shown, the passive infrared induction type ultraviolet disinfection device provided by the embodiment of the present invention further includes an ultraviolet irradiance detection circuit connected to the central processing unit 104.

[0053] The central processing unit 104 compares the irradiance (optical power parameter) of the ultraviolet disinfection lamp 103 detected by the ultraviolet irradiance detection circuit with the initial ultraviolet irradiance of the ultraviolet disinfection lamp 103 at the time of leaving the factory, calculates the light decay value of the ultraviolet disinfection lamp 103, and then compares the light decay value with a preset light decay value threshold to determine whether the ultraviolet disinfection lamp 103 needs to be replaced. For example, when the irradiance of the ultraviolet disinfection lamp 103 decays to 65% of the initial ultraviolet irradiance at the time of leaving the factory, a prompt is given to replace the lamp tube, and the light decay value of the ultraviolet disinfection lamp 103 is displayed in real time during use.

[0054] To further improve the accuracy of predicting the remaining lifespan of the ultraviolet disinfection lamp 103, the central processing unit 104 is further configured to fit the light decay curve of the ultraviolet disinfection lamp 103 according to the detection results of the ultraviolet irradiance detection circuit within a preset time period, and determine the remaining lifespan of the ultraviolet disinfection lamp 103 according to the light decay curve. The light decay curve of the ultraviolet disinfection lamp 103 is fitted according to the detection results of the ultraviolet irradiance detection circuit corresponding to each historical time node stored in the memory 109, and then the remaining lifespan of the ultraviolet disinfection lamp 103 is determined according to the light decay curve.

[0055] In a specific implementation, the ultraviolet irradiance detection circuit specifically includes a short-wave sterilizing ultraviolet band detection probe 110 and an amplifier circuit 111;

[0056] The short-wave sterilizing ultraviolet band detection probe 110 is installed in the radiation area of the ultraviolet disinfection lamp 103. The first end of the amplifier circuit 111 is connected to the output end of the short-wave sterilizing ultraviolet band detection probe 110, and the second end of the amplifier circuit 111 is connected to the central processing unit 104.

[0057] As Figure 7As shown, the short-wave sterilizing ultraviolet band detection probe 110 includes an irradiance detection probe UVC1, chips U4 and U5. The irradiance detection probe UVC1 is connected to a 3.3V DC power supply. The irradiance detection probe UVC1 outputs a SW+ signal through chip U4, and the irradiance detection probe UVC1 outputs a SW- signal through chip U5. Pin 1 (IN) of chip U4 and pin 1 (IN) of chip U5 are both connected to Figure 2 pin 38 (PA15) of the microcontroller MCU U14. The microcontroller MCU U14 outputs a MER DIR signal through pin 38 to control the forward and reverse conversion of the measurement by the irradiance detection probe UVC1.

[0058] As Figure 8 shown, the amplifier circuit 111 is built by chips U12 and U13. Pin 6 (VOUT) of chip U12 is connected to pin 3 (REF+) of chip U13 to provide an ADC reference signal for chip U13. Figure 7 The SW+ signal of chip U4 in is input to pin 21 (AIN0) of chip U13 through the operational amplifier U3A circuit, and the SW- signal of chip U5 is input to pin 22 (AIN1) of chip U13 through the operational amplifier U3B circuit. Pins 11-15 (DOUT / DIN, SCLK, SYN / ) of chip U13 are respectively connected to Figure 2 pins 42, 41, 40, 39, 37 (PB6, PB5, PB4, PB3, PB14) of the microcontroller MCU U14 to output the irradiance detection result of the ultraviolet disinfection lamp 103 to the microcontroller MCU U14.

[0059] As Figure 6 shown, the passive infrared induction type ultraviolet disinfection device provided by the embodiment of the present invention may further include a wireless communicator 112 connected to the central processor 104. The central processor 104 is further configured to send parameters such as the disinfection record and remaining life of the ultraviolet disinfection lamp 103 to the monitoring center through the wireless communicator 112.

[0060] The above has introduced in detail a passive infrared induction type ultraviolet disinfection device provided by the present invention. The various embodiments in the specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same and similar parts among the various embodiments can be referred to each other. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0061] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

Claims

1. A passive infrared induction type ultraviolet disinfection device, characterized in that, Comprising: A plurality of passive infrared detectors for monitoring a target area, a UV disinfection lamp drive circuit, a UV disinfection lamp connected to the second end of the UV disinfection lamp drive circuit, and a central processor respectively connected to the first ends of each of the passive infrared detectors and the UV disinfection lamp drive circuit for controlling the UV disinfection lamp drive circuit to turn off the UV disinfection lamp after the passive infrared detector detects a target object passing through the target area, and a UV disinfection lamp switch connected to the central processor; Wherein, the central processor controls the UV disinfection lamp drive circuit to turn off the UV disinfection lamp after the passive infrared detector detects a target object, specifically: after the central processor receives signals that a preset number of the passive infrared detectors detect the target object, it determines that the target object has passed through the target area and controls the UV disinfection lamp drive circuit to turn off the UV disinfection lamp; The central processor is further configured to, after controlling the UV disinfection lamp drive circuit to turn off the UV disinfection lamp, when the UV disinfection lamp switch is not turned off within a preset time, turn on the UV disinfection lamp to continue the disinfection work until a preset disinfection duration is reached; The number of the passive infrared detectors is specifically three; the three passive infrared detectors are located on the same straight line, and the two passive infrared detectors at both ends form a 30° angle with the straight line to form a 180° detection angle; When only two of the passive infrared detectors detect the target object, it is considered that a person has passed through the target area, and the central processor controls the UV disinfection lamp drive circuit to turn off the UV disinfection lamp.

2. The passive infrared induction type ultraviolet disinfection device according to claim 1, wherein The passive infrared detector is specifically a pyroelectric sensor.

3. The passive infrared induction type ultraviolet disinfection device according to claim 1, wherein It further includes an alarm connected to the central processor.

4. The passive infrared induction type ultraviolet disinfection device according to claim 1, wherein, It further includes a UV irradiance detection circuit connected to the central processor.

5. The passive infrared induction type ultraviolet disinfection device according to claim 4, characterized in that, The UV irradiance detection circuit specifically includes a short-wave sterilizing UV band detection probe and an amplifier circuit; The short-wave sterilizing UV band detection probe is installed in the radiation area of the UV disinfection lamp, the first end of the amplifier circuit is connected to the output end of the short-wave sterilizing UV band detection probe, and the second end of the amplifier circuit is connected to the central processor.

6. The passive infrared induction type ultraviolet disinfection device according to claim 4, wherein, The central processor is further configured to fit the light decay curve of the UV disinfection lamp according to the detection results of the UV irradiance detection circuit within a preset time period, and determine the remaining life of the UV disinfection lamp according to the light decay curve.

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