KR101712966B1 - Passive infrared(pir) sensor, security system including the pir sensor and method for operating the security system - Google Patents

Abstract

A passive infrared (PIR) sensor according to an embodiment of the present invention includes a PIR sensing module for sensing a human body, a temperature sensor for measuring an ambient temperature and generating a measurement value, a memory for storing a reference temperature received from the input interface, A processor for calculating a difference between the measured value and the reference temperature, generating a control signal for controlling the sensitivity of the PIR sensing module based on the calculation result, and outputting the generated control signal to the PIR sensing module Wherein the PIR sensing module includes a sensitivity adjustment circuit for adjusting the sensitivity in response to the control signal and senses the human body based on the adjusted sensitivity.

Description

TECHNICAL FIELD [0001] The present invention relates to a PIR sensor, a security system including the PIR sensor, and a method of operating the security system. ≪ Desc / Clms Page number 1 >

The present invention relates to a passive infrared (PIR) sensor, and more particularly to a PIR sensor capable of measuring the ambient temperature in real time and controlling the sensitivity of the PIR sensor based on the measurement result, a security system including the PIR sensor, And a method of operating the security system.

PIR (passive infrared) sensors are widely used in security systems that detect human bodies and inform intrusions. The PIR sensor senses infrared rays that change according to the movement of the human body, and can determine that a human body exists according to the detection result.

Due to the nature of the security system, which requires accurate notification of a person's intrusion, the accuracy of the PIR sensor must be high and the occurrence of false (or malfunctioning) should be minimized. However, if the ambient temperature changes due to changes in the environmental conditions such as the temperature or the humidity, the PIR sensor may not be able to accurately detect the human body, and thus an error may occur.

For example, if the ambient temperature is similar to the temperature of the human body, the PIR sensor may determine that the human body does not exist even though the human body is present, and the reliability of the security system may deteriorate.

1. Registration Patent Publication: Registration No. 10-0347109 (registered on July 20, 2002) 2. Registration Patent Publication: Registration No. 10-1320861 (Registered October 16, 2013)

SUMMARY OF THE INVENTION The present invention provides a PIR sensor and a method of operating the PIR sensor. The PIR sensor measures the ambient temperature and automatically adjusts the sensitivity of the PIR sensor according to the measured result.

A passive infrared (PIR) sensor according to an embodiment of the present invention includes a passive infrared (PIR) sensing module for sensing a human body, a temperature sensor for measuring an ambient temperature and generating a measurement value, And a control unit for generating a control signal for controlling the sensitivity of the PIR sensing module based on the calculation result and outputting the generated control signal to the PIR sensing module Wherein the PIR sensing module includes a sensitivity adjustment circuit for adjusting the sensitivity in response to the control signal and senses the human body based on the adjusted sensitivity. The processor generates the control signal for adjusting the sensitivity to be inversely proportional to the calculated difference.

According to an embodiment, the memory stores a reference table that provides a set value of the sensitivity adjustment circuit for a difference between the measured value and the reference temperature, and the processor sets a set value for the calculated difference to the reference table And generates the control signal for controlling the sensitivity control circuit to have a set value that is read.

According to an embodiment, the sensitivity adjustment circuit may be a digital variable resistor that adjusts the sensitivity by changing a resistance value in response to the control signal. According to an embodiment, the PIR sensing module includes an amplification block that amplifies the sensing voltage output from the sensing block and outputs the amplified sensed voltage to a comparison block, and the sensitivity adjustment circuit is implemented within the amplification block .

A security system according to an embodiment of the present invention includes at least one PIR sensor and an operating server for receiving and processing a sensing signal output when the human body is sensed from the at least one PIR sensor, The PIR sensor includes a PIR sensing module for sensing the human body, a temperature sensor for measuring an ambient temperature and generating a measurement value, a memory for storing a reference temperature received from the input interface, And a processor for generating a control signal for controlling the sensitivity of the PIR sensing module based on the calculation result and outputting the generated control signal to the PIR sensing module, And a sensitivity adjustment circuit for adjusting the sensitivity in response to the control signal, Sense the body.

According to an embodiment, the security system further comprises an alarm device, wherein the operating server generates an alarm signal for activating the alarm device based on the received sensed signal, and transmits the generated alarm signal to the alarm device Output. According to an embodiment, the security system further includes an electronic device connected to the operation server and receiving detection information corresponding to the detection signal from the operation server.

A method of operating a security system comprising a PIR sensor and an operating server according to an embodiment of the present invention includes the steps of the PIR sensor adjusting the sensitivity of the PIR sensor based on ambient temperature, Sensing the human body based on the sensitivity; transmitting, by the PIR sensor, a sensing signal generated when the human body is sensed to the operating server; and the operating server processes the received sensing signal, And transmitting the result to a peripheral device connected to the operation server.

Wherein adjusting the sensitivity comprises: the PIR sensor measuring the ambient temperature using a temperature sensor and generating a measured value; and the PIR sensor calculating a difference between the measured value and a reference temperature Generating a control signal for controlling the sensitivity of the PIR sensing module included in the PIR sensor based on the calculation result; and a sensitivity adjustment circuit included in the PIR sensing module, And adjusting the sensitivity in response to the signal.

According to an embodiment, the PIR sensor stores in a memory included in the PIR sensor a reference table that provides a set value of the sensitivity adjustment circuit for a difference between the measured value and the reference temperature, The generating includes: the PIR sensor reading the set value for the calculated difference from the reference table; and the PIR sensor controlling the sensitivity adjustment circuit such that the sensitivity adjustment circuit has a set value that is read And generating the control signal for the control signal.

According to an embodiment, the sensitivity adjustment circuit is a digital variable resistor, and the sensitivity adjustment circuit adjusting the sensitivity in response to the control signal is characterized in that the sensitivity adjustment circuit comprises: Thereby adjusting the sensitivity. The peripheral device may be any one of a microcomputer, an alarm device, a smart phone, a tablet PC, and a PC.

The PIR sensor according to the embodiment of the present invention has an effect of automatically detecting the ambient temperature and automatically adjusting the sensitivity of the PIR sensor according to the measurement result to prevent misreading of the PIR sensor.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to more fully understand the drawings recited in the detailed description of the present invention, a detailed description of each drawing is provided.
1 is a schematic block diagram of a security system including a PIR sensor according to an embodiment of the present invention.
FIG. 2 is a schematic block diagram for explaining the operation of the PIR sensor shown in FIG. 1. FIG.
3 is a schematic block diagram of the PIR sensing module shown in FIG.
FIG. 4 shows an embodiment of the amplification block and sensitivity adjustment circuit shown in FIG.
5 is a graph for explaining an embodiment of an operation of adjusting the sensitivity according to a change in the ambient temperature.
FIG. 6 is an example of a reference table for storing a sensitivity set value for the difference between the measured ambient temperature and the reference temperature.
Figures 7 and 8 are flowcharts illustrating the operation of the security system according to embodiments of the present invention.

It is to be understood that the specific structural or functional description of embodiments of the present invention disclosed herein is for illustrative purposes only and is not intended to limit the scope of the inventive concept But may be embodied in many different forms and is not limited to the embodiments set forth herein.

The embodiments according to the concept of the present invention can make various changes and can take various forms, so that the embodiments are illustrated in the drawings and described in detail herein. It should be understood, however, that it is not intended to limit the embodiments according to the concepts of the present invention to the particular forms disclosed, but includes all modifications, equivalents, or alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms may be named for the purpose of distinguishing one element from another, for example, without departing from the scope of the right according to the concept of the present invention, the first element may be referred to as a second element, The component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like are used to specify that there are features, numbers, steps, operations, elements, parts or combinations thereof described herein, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

A module in this specification may mean hardware capable of performing the functions and operations according to the respective names described in this specification or may include computer program codes capable of performing specific functions and operations May mean an electronic recording medium, such as a processor, having computer program code embodied therein or capable of performing a particular function and operation.

In other words, a module may mean a functional and / or structural combination of hardware for carrying out the technical idea of the present invention and / or software for driving the hardware.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings attached hereto.

1 is a schematic block diagram of a security system including a PIR sensor according to an embodiment of the present invention. 1, the security system 10 includes at least one PIR sensor 100-1 through 100-N, collectively 100 and N a natural number, an operating server 200, and at least one peripheral 300 -1 to 300-M, collectively 300; M is a natural number).

The PIR sensor 100 senses the motion of an object (for example, a human body) that emits infrared rays, and when it is determined that the object exists, the PIR sensor 100 generates and outputs a sensing signal.

The PIR sensor 100 according to the embodiment of the present invention can measure the ambient temperature in real time and automatically adjust the sensitivity of the PIR sensor 100 according to the measurement result. For example, as the difference between the ambient temperature and the reference temperature (e.g., the body temperature of the human body (36.5 DEG)) decreases, the PIR sensor 100 increases the sensitivity and the difference between the ambient temperature and the reference temperature increases The more the PIR sensor 100 is able to reduce the sensitivity.

The operation server 200 may receive the detection signal output from the PIR sensor 100 and process the received detection signal.

The peripheral device 300 may be connected to the operating server 200 in a wired and / or wireless manner. According to an embodiment, when the peripheral device 300 is a computing device such as a smart phone, a tablet PC, or a PC, the operating server 200 transmits data and / or information including the processing result of the detection signal to the peripheral device 300). The peripheral device 300 may process the data and / or information received from the operation server 200 or may display it through a display (not shown).

According to another embodiment, the peripheral device 300 may be a microcomputer (not shown) that can control door automatic opening and closing, lighting turn-on / turn-off, or various electronic devices (such as TVs and air conditioners) Or the microcomputer), the operation server 200 may transmit the control signal for controlling the peripheral device 300 to the peripheral device 300 by processing the detection signal.

FIG. 2 is a schematic block diagram for explaining the operation of the PIR sensor shown in FIG. 1. FIG. 1 and 2, a PIR sensor 100-1 includes a processor 110, a memory 120, an input interface 130, a temperature sensor 140, an output interface 150, and a PIR sensing module 400).

The processor 110 may control operation of at least one of the components 120, 130, 140, 150, and 400 via the bus 111. [ The processor 110 may be, but is not limited to, a CPU, an application processor (AP), and a mobile AP.

The processor 110 calculates the difference between the reference temperature REF stored in the memory 120 and the measured value ET generated by the temperature sensor 140 and outputs the difference to the PIR sensing module 400, And transmit the generated control signal CTRL to the PIR sensing module 400. The control signal CTRL may be a signal for controlling the sensitivity of the PIR sensing module 400, According to the embodiment, the processor 110 reads the set value for the calculated difference from the reference table (REF_TABLE) stored in the memory 120 and sets the set value of the sensitivity adjustment circuit included in the PIR sensing module 400 And generates a control signal CTRL for automatically controlling the sensitivity by changing the read set value to transmit the generated control signal CTRL to the PIR sensing module 400. [

The memory 120 may store instructions necessary for the operation of the processor 110, a plurality of applications, and / or various data generated according to an embodiment of the present invention or received from the input interface 130. For example, the memory 120 may receive and store a reference temperature REF from the input interface 130, and may further receive and store a reference table REF_TABLE according to an embodiment.

According to an embodiment, the memory 120 may operate as a working memory of the processor 110 and may be implemented as a cache, a dynamic random access memory (DRAM), or a static RAM (SRAM). According to another embodiment, the memory 120 may be implemented as a flash-based memory. The flash-based memory may be a multimedia card (MMC), an embedded MMC (eMMC), a universal flash storage (UFS), or a solid state drive (SSD) . ≪ / RTI >

Memory 120 may be understood in a collective sense to include one or more memories.

The input interface 130 can receive the reference temperature REF from the microcomputer (or microcomputer) on the manager side. For example, the input interface 130 may be an input port that can be connected to the microcomputer.

The reference temperature REF refers to a reference value used to adjust the sensitivity of the PIR sensor 100-1 by calculating the difference from the measured value ET generated by the temperature sensor 140. [ The reference temperature REF may be a body temperature (e.g., 36.5 DEG) of the human body 600, but it is not limited thereto and may have a value set by the administrator.

The received reference temperature REF may be stored in the memory 120 under the control of the processor 110. According to an embodiment, the reference temperature REF may be input from the microcomputer via the input interface 130 during the installation of the PIR sensor 100-1, but is not limited thereto.

According to an embodiment, the input interface 130 receives a reference table REF_TABLE from the microcomputer, and the received reference table REF_TABLE may be stored in the memory 120. [ The reference table REF_TABLE is used as an application for providing the set value of the sensitivity adjustment circuit for the difference between the reference temperature REF and the measured value ET.

The temperature sensor 140 can measure the ambient temperature 500 of the PIR sensor 100-1 in real time and generate the measured value ET according to the measurement result. The generated measurement value ET can be processed by the processor 110 or stored in the memory 120. [ The temperature sensor 140 may be a digital thermometer.

The output interface 150 may transmit the sensing signal DS generated by the PIR sensing module 400 to the operation server 200 by wire or wirelessly. The operation server 200 processes the received sensing signal DS and transmits the sensed information DI generated as a result of the processing to a peripheral device (e.g., a smart phone, a tablet PC, and / or a PC 300-1) , And may transmit the alarm signal (ALARM) generated as a result of the process to a peripheral device (e.g., alarm device 300-2).

Although the input interface 130 and the output interface 150 are illustrated separately in FIG. 2, the input interface 130 and the output interface 150 may be implemented as one input / output interface have.

The PIR sensing module 400 senses the presence of the human body 600 by using the amount of change of the infrared ray according to the movement of the human body 600 that emits the infrared ray and transmits the sensed signal DS, To the processor 110 or to the output interface 150 via the interface. The PIR sensing module 400 may adjust the sensitivity of the PIR sensing module 400 in response to the control signal CTRL transmitted from the processor 110.

3 is a schematic block diagram of the PIR sensing module shown in FIG. Referring to FIGS. 1 to 3, the PIR sensing module 400 may include a sensing block 420, an amplifying block 440, and a comparing block 460.

The sensing block 420 may generate the sensing voltage SV corresponding to the amount of change of the infrared ray according to the movement of the human body 600 and output the sensed voltage SV to the amplification block 440. The amplification block 440 may amplify the sensing voltage SV input from the sensing block 420 and output the amplification voltage AV to the comparison block 460. [ The amplification block 440 may include a sensitivity control circuit 450.

The sensitivity adjustment circuit 450 may receive the control signal CTRL output from the processor 110 and may adjust the sensitivity of the PIR sensing module 400 in response to the received control signal CTRL. The sensitivity adjustment circuit 450 can adjust the sensitivity by adjusting the degree to which the sensing voltage SV is amplified when amplified to the amplification voltage AV in the amplification block 440. [

Although sensitivity control circuit 450 is shown implemented in amplification block 440 in Figure 3, sensitivity control circuit 450 may be implemented between sensing block 420 and amplification block 440, May be implemented between the amplification block 440 and the comparison block 460.

For example, when the sensitivity adjustment circuit 450 is implemented between the sensing block 420 and the amplification block 440, the sensitivity adjustment circuit 450 adjusts the magnitude of the sense voltage SV in response to the control signal CTRL. So that the sensitivity can be controlled. When the sensitivity adjusting circuit 450 is implemented between the amplifying block 440 and the comparing block 460, the sensitivity adjusting circuit 450 adjusts the amplitude of the amplifying voltage AV in response to the control signal CTRL, Sensitivity can be adjusted.

The comparison block 460 may compare the amplified voltage AV input from the amplification block 440 with a reference voltage and generate a sensing signal DS based on the comparison result. For example, when the amplification voltage AV is greater than the reference voltage, the comparison block 460 may determine that the human body 600 is sensed and generate the sensing signal DS. The comparison block 460 may transmit the generated sense signal DS to the processor 110 or the output interface 150 via the bus 111. [

FIG. 4 shows an embodiment of the amplification block and sensitivity adjustment circuit shown in FIG. The amplification block 440 shown in FIG. 4 is merely an embodiment for convenience of explanation, and thus the scope of the present invention is not limited thereto. The structure of the amplification block 440 may be a predictable range As shown in FIG.

Referring to FIGS. 2 through 4, the amplification block 440 may include a first amplification circuit 442 and a second amplification circuit 444. According to an embodiment, the first amplifying circuit 442 may be a non-inverting amplifier and the second amplifying circuit 444 may be an inverting amplifier, but is not limited thereto.

The first amplifying circuit 442 amplifies the sensing voltage SV input from the sensing block 420 to generate a first amplifying voltage FAV and outputs the generated first amplifying voltage FAV to the second amplifying circuit 444, respectively.

The second amplifying circuit 444 amplifies the first amplifying voltage FAV input from the first amplifying circuit 442 to generate the amplifying voltage AV and outputs the generated amplifying voltage AV to the comparing block 460. [ As shown in FIG. The second amplifying circuit 444 may be implemented as an operational amplifier (OP-AMP) 446 for amplifying the first amplifying voltage FAV to an amplifying voltage AV. The sensitivity adjustment circuit 450 connected between the first amplification voltage FAV and the amplification voltage AV may be implemented as a digital variable resistor. For example, the sensitivity control circuit 450 is connected between the input terminal of the second amplification circuit 444 (= the first amplification voltage FAV is input) and the output terminal (the amplification voltage AV is output) Digital variable resistor, but is not limited thereto.

The sensitivity adjustment circuit 450 may adjust the degree of amplification of the amplification voltage AV by changing the resistance value in response to the control signal CTRL input from the processor 110. That is, For example, in the case of increasing the sensitivity, the sensitivity adjustment circuit 450 may decrease the resistance value in response to the control signal CTRL, and when decreasing the sensitivity, the sensitivity adjustment circuit 450 may increase the resistance value Can be increased.

5 is a graph for explaining an embodiment of an operation of adjusting the sensitivity according to a change in the ambient temperature. 1 to 5, when the difference (ET-REF |) between the measured value ET and the reference temperature REF is large, even if the sensitivity S of the PIR sensing module 400 is low, If the difference between the measured value ET and the reference temperature REF is small, the sensitivity S of the PIR sensing module 400 must be high so that the human body 600 ) Can be detected sufficiently. That is, the difference (ET-REF |) between the measured value ET and the reference temperature REF and the sensitivity S of the PIR sensing module 400 are inversely proportional to each other.

5, the abscissa represents the difference (ET-REF |) between the measured value ET and the reference temperature REF, and the ordinate represents the sensitivity S of the PIR sensing module 400. In other words, .

The processor 110 generates a control signal CTRL for decreasing the sensitivity S and outputs the generated control signal CTRL to the sensitivity adjustment circuit 450 as the difference ET-REF | (CASE1). For example, if the sensitivity control circuit 450 is a digital variable resistor as described in FIG. 4, the processor 110 may change the sensitivity S from a first sensitivity S1 to an eighth sensitivity (S8), and output the generated control signal (CTRL) to the sensitivity adjustment circuit 450 (CASE2).

6 is an example of a reference table for storing a set value of the sensitivity adjusting circuit for the difference between the measured ambient temperature and the reference temperature. The reference table REF_TABLE shown in FIG. 6 is for convenience of description, and the configuration of the reference table REF_TABLE can be variously modified within a range that can be predicted by a normal descriptor.

Referring to FIGS. 1 to 6, the PIR sensor 100-1 may store a reference table REF_TABLE input through the input interface 130 in the memory 120. FIG. The reference table REF_TABLE includes a first field indicating the difference ET-REF | between the measured value ET of the ambient temperature 500 by the temperature sensor 140 and the reference temperature REF, And a second field for indicating a set value of the sensitivity control circuit 450 for the first signal.

The set value is a value for setting the sensitivity S of the PIR sensor 100-1 optimized for each difference (ET-REF |) between the measured value ET and the reference temperature REF, But it is not limited thereto. That is, the set values of the reference table REF_TABLE stored for each of the at least one PIR sensor 100-1 through 100-N shown in FIG. 1 may vary.

The second field shown in FIG. 6 is a field for indicating the resistance value R when the sensitivity control circuit 450 is a variable resistor (in particular, a digital variable resistor) In the case (CASE2), the reference table (REF_TABLE) can be applied. The contents of the second field may vary depending on the type of the sensitivity control circuit 450.

The processor 110 calculates the difference ET-REF | between the measured value ET and the reference temperature REF and sets the set value of the sensitivity adjusting circuit 450 for the difference ET-REF | It can be read from the reference table (REF_TABLE). The processor 110 may generate a control signal CTRL that controls the sensitivity adjustment circuit 450 such that the sensitivity adjustment circuit 450 has a set value that is read.

For example, if the difference (| ET-REF |) is 1.7, the resistance value of the sensitivity adjustment circuit 450 implemented as a variable resistor may be changed to 600 ohms and the processor 110 may change the resistance value of the sensitivity adjustment circuit 450 A control signal CTRL for changing the resistance value to 600 ohms can be generated. The sensitivity adjustment circuit 450 may change the sensitivity S of the PIR sensing module 400 by changing the resistance value to 600 ohms in response to the control signal CTRL.

7 is a flowchart showing the operation of the security system according to the embodiment of the present invention. 1 to 7, the PIR sensor 100 may measure the ambient temperature 500 and generate the measured value ET using the temperature sensor 140 included in the PIR sensor 100 S100).

The PIR sensor 100 may calculate the difference (ET-REF |) between the measured value ET and the reference temperature REF (S110). The reference temperature REF may be input via the input interface 130, stored in the memory 120, and read by the processor 110.

The processor 110 generates a control signal CTRL for controlling the sensitivity setting circuit 450 so that the sensitivity S of the PIR sensing module 400 is inversely proportional to the difference ET-REF | , And transmits the generated control signal CTRL to the PIR sensing module 400 (S130). It is necessary to increase the sensitivity S of the PIR sensing module 400 as the difference (| ET-REF |) becomes smaller, i.e., the ambient temperature 500 becomes closer to the reference temperature REF, It is possible to accurately detect the signal 600.

The sensitivity setting circuit 450 included in the PIR sensing module 400 may adjust the sensitivity S of the PIR sensing module 400 in response to the control signal CTRL at step S140. According to the embodiment, when the sensitivity setting circuit 450 is a digital variable resistor, the sensitivity setting circuit 450 changes the resistance value in response to the control signal CTRL, and changes the sensitivity S by the changed resistance value .

The PIR sensing module 400 performs a sensing operation based on the sensed sensitivity and transmits a sensing signal DS generated when the human body 600 is sensed as an operation to the processor 110 or to the output interface 150 To the operation server 200 (S150). The operation server 200 can process the received sensing signal DS and transmit the sensed data DI or the alarm signal ALARM generated as a result of the processing to the peripheral device 300. [

8 is a flowchart showing the operation of the security system according to another embodiment of the present invention. Referring to FIGS. 1 to 8, steps S200, S210, and S250 of FIG. 8 are substantially the same as steps S100, S110, and S150 of FIG. 7, respectively.

The processor 110 included in the PIR sensor 100 determines the set value of the sensitivity adjustment circuit 450 for the calculated difference (ET-REF |) between the measured value ET and the reference temperature REF, (REF_TABLE) stored in the reference table 120 (S220). For example, when the sensitivity control circuit 450 is a digital variable resistor, the set value may be a resistance value R. The reference table (REF_TABLE) may be input via input interface 130 and stored in memory 120.

The processor 110 generates a control signal CTRL for controlling the sensitivity adjustment circuit 450 so that the sensitivity adjustment circuit 450 has a set value that has been read and outputs the generated control signal CTRL to the PIR sensing module 400) (S230).

The sensitivity setting circuit 450 included in the PIR sensing module 400 may change the value of the sensitivity adjusting circuit 450 to the read set value in response to the control signal CTRL at step S240. As the value of the sensitivity adjustment circuit 450 is changed, the sensitivity S of the PIR sensing module 400 can be changed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: Security system
100-1 to 100-N: passive infrared (PIR) sensor
200: Operating server
300-1 to 300-M: Peripherals
400: PIR sensing module
450: Sensitivity adjustment circuit
500: Ambient temperature
600: human body

Claims (16)

A passive infrared (PIR) sensing module for sensing the human body;
A temperature sensor for measuring an ambient temperature and generating a measured value;
A memory for storing a reference temperature received from an input interface; And
A processor for calculating a difference between the measured value and the reference temperature, generating a control signal for controlling the sensitivity of the PIR sensing module based on the calculation result, and outputting the generated control signal to the PIR sensing module and,
The PIR sensing module includes:
A sensing block for generating a sensing voltage according to the motion of the human body;
An amplifying block for amplifying the sensing voltage output from the sensing block and outputting the amplified sensed voltage;
A comparison block for generating a sense signal using the amplified sense voltage input from the amplification block; And
And a sensitivity adjustment circuit for adjusting the sensitivity in response to the control signal,
Sensing the human body based on the adjusted sensitivity,
Wherein the amplification block comprises:
A first amplifying circuit for generating a first amplifying voltage by amplifying the sensing voltage; And
And a second amplifying circuit for generating a second amplifying voltage by amplifying the first amplifying voltage,
Wherein the first amplifying circuit is a non-inverting amplifier, the second amplifying circuit is an inverting amplifier,
Wherein the sensitivity adjusting circuit is a digital variable resistor connected between an input and an output terminal of the second amplifying circuit and adjusting the sensitivity by changing a resistance value in response to the control signal. The method according to claim 1,
Wherein the processor generates the control signal for adjusting the sensitivity to be inversely proportional to the calculated difference. 2. The apparatus of claim 1,
Storing a reference table for providing a set value of the sensitivity adjustment circuit for a difference between the measured value and the reference temperature,
The processor comprising:
A set value for the calculated difference is read from the reference table,
Wherein the sensitivity control circuit generates the control signal for controlling to have a read set value. delete delete At least one PIR sensor; And
And an operation server for receiving and processing a detection signal output from the at least one PIR sensor when a human body is detected,
Wherein the at least one PIR sensor comprises:
A PIR sensing module for sensing the human body;
A temperature sensor for measuring an ambient temperature and generating a measured value;
A memory for storing a reference temperature received from an input interface; And
A processor for calculating a difference between the measured value and the reference temperature, generating a control signal for controlling the sensitivity of the PIR sensing module based on the calculation result, and outputting the generated control signal to the PIR sensing module and,
The PIR sensing module includes:
A sensing block for generating a sensing voltage according to the motion of the human body;
An amplifying block for amplifying the sensing voltage output from the sensing block and outputting the amplified sensed voltage;
A comparison block for generating a sense signal using the amplified sense voltage input from the amplification block; And
And a sensitivity adjustment circuit for adjusting the sensitivity in response to the control signal,
Sensing the human body based on the adjusted sensitivity,
Wherein the amplification block comprises:
A first amplifying circuit for generating a first amplifying voltage by amplifying the sensing voltage; And
And a second amplifying circuit for generating a second amplifying voltage by amplifying the first amplifying voltage,
Wherein the first amplifying circuit is a non-inverting amplifier, the second amplifying circuit is an inverting amplifier,
Wherein the sensitivity adjustment circuit is a digital variable resistor connected between an input and an output stage of the second amplification circuit and adjusting the sensitivity by changing a resistance value in response to the control signal. 7. The apparatus of claim 6,
And generates the control signal for adjusting the sensitivity to be inversely proportional to the calculated difference. 7. The apparatus of claim 6,
Storing a reference table for providing a set value of the sensitivity adjustment circuit for a difference between the measured value and the reference temperature,
The processor comprising:
A set value for the calculated difference is read from the reference table,
Wherein the sensitivity control circuit generates the control signal for controlling to have a set value that is read. delete 7. The apparatus of claim 6, further comprising an alarm device,
Wherein the operation server generates an alarm signal for operating the alarm device based on the received detection signal, and outputs the generated alarm signal to the alarm device. 7. The security system according to claim 6, further comprising an electronic device connected to the operation server and receiving detection information corresponding to the detection signal from the operation server. A method of operating a security system comprising a PIR sensor and an operating server,
The PIR sensor adjusting the sensitivity of the PIR sensor based on ambient temperature;
The PIR sensor sensing a human body based on the sensed sensitivity;
Transmitting the detection signal generated when the PIR sensor detects the human body to the operation server; And
Wherein the operating server processes the received sensing signal and transmits a processing result to a peripheral device connected to the operating server,
The step of adjusting the sensitivity comprises:
Wherein the PIR sensor measures the ambient temperature using a temperature sensor and generates a measured value;
The PIR sensor calculating a difference between the measured value and a reference temperature;
The PIR sensor generating a control signal for controlling the sensitivity of the PIR sensing module included in the PIR sensor based on the calculation result; And
Wherein the sensitivity control circuit included in the PIR sensing module includes the step of adjusting the sensitivity in response to the control signal,
Wherein the sensing the human body comprises:
Wherein the sensing block included in the PIR sensor comprises: generating a sensing voltage according to movement of the human body;
Amplifying the sensing voltage outputted from the sensing block and outputting the amplified sensing voltage; And
Wherein the comparison block included in the PIR sensor includes a step of generating a sensing signal using the amplified sensing voltage input from the amplification block,
Wherein the amplification block comprises:
A first amplifying circuit for generating a first amplifying voltage by amplifying the sensing voltage; And
And a second amplifying circuit for generating a second amplifying voltage by amplifying the first amplifying voltage,
Wherein the first amplifying circuit is a non-inverting amplifier, the second amplifying circuit is an inverting amplifier,
Wherein the sensitivity adjustment circuit is a digital variable resistor connected between an input terminal and an output terminal of the second amplification circuit,
Wherein the step of adjusting the sensitivity in response to the control signal comprises:
Wherein the sensitivity adjustment circuit adjusts the sensitivity by changing a resistance value in response to the control signal. delete 13. The apparatus of claim 12, wherein the PIR sensor comprises:
Storing a reference table for providing a set value of the sensitivity adjustment circuit for a difference between the measured value and the reference temperature in a memory included in the PIR sensor,
Wherein the step of generating the control signal comprises:
The PIR sensor reading the set value for the calculated difference from the reference table; And
Generating the control signal for controlling the sensitivity adjustment circuit such that the PIR sensor has the set sensitivity control circuit at the set reading. delete 13. The method of claim 12, wherein the peripheral device is one of a microcomputer, an alarm device, a smart phone, a tablet PC, and a PC.

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