KR101834180B1 - Module for sensing moving and standing human body using shutter means, and system and method using the same - Google Patents

Abstract

The present invention provides a shutter-type chopper that compensates for the disadvantage that a conventional human body detecting sensor can detect only a moving human body by using a camera shutter type chopper so that a moving human body as well as a moving human body can be detected. The present invention relates to a moving and stationary human body detecting sensor module using a mobile body and a human body detecting system using the same, and more particularly, It can be applied in various forms including various electronic devices which need to be driven only when there is a person, and it is possible to realize quietness and miniaturization without generating noise, and when the human body is not detected at a certain time, Which uses a shutter type chopper that can minimize power consumption by stopping The present invention relates to a human body detection sensor module and a human body detection system using the same.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a moving and stopping human detection sensor module using a shutter type chopper, and a human body detection system and method using the same.

The present invention relates to a human body detecting system, and more particularly, to a human body detecting method using a camera shutter type chopper to detect not only a moving human body but also a moving human body, And a human body detection system and method using the same.

Recently, a human body detection system using a pyroelectric infrared (PIR) sensor, which is commercialized, is mainly used for an automatic lighting device and an intruder alarm device of an apartment entrance or a stairway.

Hereinafter, the PIR sensor related to the present invention will be described in detail with reference to FIGS. 1 to 4. FIG. FIG. 2 is a block diagram of a sensor interface circuit of the sensing system of FIG. 1; FIG. 3 is a view for explaining the principle of moving human body detection of a PIR sensor; to be. Referring to FIG. 1, a conventional human body detection system using a PIR sensor includes a lens 11 for condensing infrared rays radiated from a moving human body, a condenser lens 11 for receiving infrared rays condensed by the lens 11, A PIR sensor 10 for outputting a sensing signal, and a sensor interface circuit 20 for amplifying and processing the output of the PIR sensor 10 and converting the output into a digital signal.

The lens 11 has a function of condensing infrared rays, and the condensed infrared rays are irradiated to the PIR sensor 10. When an infrared ray is input, a polarization phenomenon occurs in the PIR sensor 10 and a voltage is generated at the output. However, the polarization is directly neutralized with the ions in the atmosphere and the equilibrium state is established, so that the voltage output disappears.

The PIR sensor 10 determines whether the human body is approaching with a voltage temporarily output according to the amount of infrared rays input. Since the output voltage is small in size and contains noise, the sensor interface circuit 20 performs signal processing to extract and amplify only a desired signal.

2, the sensor interface circuit 20 of the moving body detection system shown in FIG. 1 comprises an amplifier 21, a bandpass filter 23, a comparator 25 and a level converter 27, Amplifies the sensed signal output from the sensor 10, converts the sensed signal into a digital signal, and outputs the digital signal.

The signal processing performed in the sensor interface circuit 20 amplifies the signal input from the amplifier 21, filters out only a signal of a desired band in the band-pass filter 23, And converts a signal having a strength of more than a predetermined level to a digital signal level through a level converter 27 to output a final sensing signal.

The surface temperature of human beings varies depending on the temperature of the seeds and the ambient temperature, but is generally about 33 to 36 degrees Celsius, so that the radiated infrared wavelength distribution peaks at about 10 μm. The human body detection PIR sensor 10 detects the presence of a human by detecting the amount of infrared ray change. The PIR sensor 10 protects the circuit and the sensing unit inside the sensor from the external environment, including the sensing unit that converts the infrared energy of the human body into a physical signal that is easy to measure, such as current or voltage, And a window functioning as an optical filter. Since the structure of the PIR sensor is well known in the art, a detailed description thereof will be omitted.

Referring to FIG. 3, the PIR sensor 10 senses a change in infrared rays due to movement within the detection range 13, and thus does not output a detection signal in a thermal parallel state. When the infrared ray emitted by the movement 15 of the heat source is incident, a slight temperature rise occurs near the surface of the sensor element, and the equilibrium state is broken (pyroelectric effect). At this time, the sensor operates by the charge of the non-planar portion. Therefore, since the PIR sensor 10 outputs a detection signal only when the infrared rays change during the incident and the shielding, the detection signal 17 output from the PIR sensor 10 has a differential waveform. This means that the human body detection PIR sensor 10 can detect only a moving human body and can not detect a human body that is stopped.

The above-described human body detection PIR sensor 10 is utilized as a lighting device such as an apartment sensor that temporarily lights up through a time delay when a moving body is sensed. However, since the infrared ray of the human body is detected as a differential type, There is a problem that can not be detected.

Therefore, since the human body detection system according to the related art can not detect a stopped human body, the equalizing is turned off after a predetermined time elapses after detecting a moving person. For lighting, And there are many inconveniences such as having to move again, and the range of application is limited.

In order to solve this inconvenience, a system has recently been proposed in which the PIR sensor 10 itself is rotated to detect a still human body. A simplified block diagram of the sensing system in which the PIR sensor 10 rotates is shown in FIG. In this system, the principle of detecting the stationary human body by rotating the step motor 30 equipped with the PIR sensor 10 by 180 degrees or 360 degrees is used for detecting the stationary human body. 4, the infrared ray signal detected by the PIR sensor 10 is condensed through the Fresnel lens 11 and outputted as a sensing signal through the sensor interface circuit 20 to the microprocessor 40 , And the microprocessor 40 receiving the sensing signal controls the motor driving drive 50 to rotate the step motor 30. [

It is possible to detect moving and stopping persons within a distance range of 6 m or less by the method shown in FIG. However, there is a problem that it is difficult to commercialize the step motor 30 because there is a limit to noise and mechanical miniaturization due to use of the step motor 30. [

Josepth J. CARR, Sensors and circuits - sensors, transducers, supporting circuits for electronic instrumentation, measurement, and control, PTR, 1993 Kim, Young Sun, et al., "Suspension and Moving Human Body Detection System Using Super-Type Infrared Sensor", Korea Summer Conference on Information Technology, June 2007 Datasheet of BD9251FV, ROHM Datasheet of MC97F1104, ABOV Semiconductor C. F. Tsai, M. S. Young, "Pyroelectric infrared sensor-based thermometer for monitoring indoor objects ", Review of scientific instruments, Vol. 12, Dec. 2003 Choi, Chun-gyu, "Infrared remote control system", Youngjin Publishing Co., 1996 Lee, Byung-Jik, "Handbook of Sensors with Mechatronics", Book Publishing Seunun, 1989 Masski Ando, "Detection of Human Position and Movement by IR Sensor Array ", Technical Digest of the 12th sensor sysmposium. 1994

Accordingly, an object of the present invention to solve the above-mentioned problems is to provide a mobile and stationary human body detection sensor module capable of sensing not only a moving human body but also a stationary human body, and a human body sensing system and method using the same.

It is another object of the present invention to provide a mobile and stationary human body detection sensor module which can be quieted and downsized by solving the problems caused by the method of rotating the PIR sensor, and a human body detection system and method using the same.

According to an aspect of the present invention, there is provided a human body detection system including at least a pyroelectric infrared (PIR) sensor, And the chopper is positioned at the front end and the chopper is opened or closed according to a human body detection signal of the PIR sensor to initialize the PIR sensor so that the PIR sensor continuously detects the human body.

According to another aspect of the present invention, there is provided a human body detection system including at least a pyroelectric infrared (PIR) sensor, A controller for outputting an open / close control signal when a detection signal of the PIR sensor is received, and a control unit for controlling the opening / And a shutter type chopper which opens and closes and transmits and blocks infrared rays incident on the PIR sensor.

In this case, when the PIR sensor outputs a first human body detection signal, the control unit of the moving and stopping human body detection system using the shutter-type chopper according to the present invention outputs a first opening / closing control signal to close the chopper, When the second human body detection signal is outputted from the PIR sensor after outputting the first human body detection signal, the first opening / closing control unit controls the first opening / closing control unit to close the chopper, And if the second human body detection signal is not received from the PIR sensor, the chopper is kept in an open state.

At this time, if there is no second human body detection signal from the PIR sensor, it is preferable that the controller keeps the chopper in an open state after a lapse of a second set time.

Preferably, the control unit further controls the chopper to stop opening and closing if a human body detection signal is not output from the PIR sensor for a third predetermined time, thereby minimizing power consumption.

The mobile and stationary human body detection system using the chaser of the shutter type according to the present invention further includes an interface unit for amplifying and filtering the human body detection signal of the PIR sensor and applying the amplified human body detection signal to the control unit, It is preferable to perform signal processing.

According to another aspect of the present invention, there is provided a moving and stationary human body detection sensor module using a chaser of a shutter type, comprising: a Fresnel lens for condensing infrared rays radiated from a human body; A PIR sensor for detecting infrared rays condensed by the Fresnel lens and outputting a detection signal; A chopper of a shutter type disposed between the Fresnel lens and the PIR sensor and intercepting infrared rays incident on the PIR sensor in response to a human body detection signal of the PIR sensor; And a barrel mounted with the Fresnel lens, the PIR sensor, and the chopper, and having a connection part for connecting the PIR sensor and the external device.

At this time, it is preferable that the lens barrel is composed of at least two or more members so as to adjust a focal distance by adjusting a separation distance between the Fresnel lens and the PIR sensor.

According to another aspect of the present invention, there is provided a method of sensing a human body using a pyroelectric infrared (PIR) sensor, A chopper which is opened or closed by a shutter system is placed at the front end of the PIR sensor and the PIR sensor is continuously opened by opening and closing the chopper according to a human body detection signal of the PIR sensor desirable.

According to another aspect of the present invention, there is provided a method of detecting a moving and a stopping human body using a chopper of a shutter type according to the present invention includes the steps of opening and closing a pyroelectric infrared (PIR) A method for detecting a human body using a moving and stopping human body detection sensor module for detecting a human body by placing a chopper in an initialization setting step of turning on an interrupt register and opening the chopper to wait for human body detection A timer for counting a predetermined time when the PIR sensor senses a human body outputs a first human body detection signal, turning off the interrupt register and closing the chopper, Controlling the interrupt register to be turned on and opening the chopper after a lapse of a shorter period of time, When the R sensor outputs a second human body detection signal, starting the timer to count the predetermined time after terminating the timer, turning off the interrupt register, and closing the chopper; And proceeding to the initialization setting step if there is no second human body detection signal from the PIR sensor until the timer expires.

In this case, if the human body detection signal is not output from the PIR sensor for a certain period of time after the lapse of the timer count time, the method for detecting movement and stopping human body using the chopper of the shutter type according to the present invention controls to stop opening and closing of the chopper It is preferable to further include:

As described above, the present invention is advantageous in that it can detect a moving body as well as a stationary body unlike an existing sensor.

In addition, the present invention is advantageous in that it is possible to provide a sensing sensor module which realizes quietness and miniaturization without generating noises for detection of moving and stationary human body.

In addition, the present invention is more intelligent than existing sensors, so that it accurately displays the presence or absence of a human body within the sensing range, thereby replacing the application range of existing sensors, and includes various electronic devices that need to be driven only when there is a person Which can be applied in various forms.

In addition, the present invention has an advantage that power consumption can be minimized by stopping the opening and closing of the chopper when the human body is not detected at a predetermined time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram schematically showing a moving human body detection system using a PIR sensor according to the prior art,
Fig. 2 is a block diagram of the sensor interface circuit of the sensing system of Fig. 1,
3 is a view for explaining the principle of moving human body detection of a PIR sensor,
4 is a simplified block diagram of a sensing system in which a PIR sensor is rotating in accordance with the prior art;
FIG. 5 is a block diagram of a moving and stopping human body detecting system using a shutter-type chopper according to the present invention.
6 is a diagram illustrating an entire circuit diagram of a moving and stopping human body detection system using a shutter type chopper according to the present invention.
7 is a control flowchart of a moving and stopping human body detection system using a shutter type chopper according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of preferred embodiments of the present invention will be given with reference to the accompanying drawings. It should be noted that the same configurations of the drawings denote the same reference numerals as possible whenever possible. It is to be understood that the present invention is not limited to the specific embodiments and that all changes, modifications, and alterations included within the spirit and scope of the present invention are intended to be illustrative, It is to be understood that the invention includes equivalents and alternatives. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

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.

The terminology used in the description is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, 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 should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

Each block of the accompanying block diagrams and combinations of steps of the flowchart may be performed by computer program instructions. These computer program instructions may be loaded into a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus so that the instructions, which may be executed by a processor of a computer or other programmable data processing apparatus, And means for performing the functions described in each step are created.

These computer program instructions may also be stored in a computer usable or computer readable memory capable of directing a computer or other programmable data processing apparatus to implement the functionality in a particular manner so that the computer usable or computer readable memory It is also possible for the instructions stored in the block diagram to produce a manufacturing item containing instruction means for performing the functions described in each block or flowchart of the block diagram.

Computer program instructions may also be stored on a computer or other programmable data processing equipment so that a series of operating steps may be performed on a computer or other programmable data processing equipment to create a computer- It is also possible that the instructions that perform the processing equipment provide the steps for executing the functions described in each block of the block diagram and at each step of the flowchart.

Also, each block or each step may represent a module, segment, or portion of code that includes one or more executable instructions for executing the specified logical function (s). It should also be noted that in some alternative embodiments, the functions mentioned in the blocks or steps may occur out of order. For example, two blocks or steps shown in succession may in fact be performed substantially concurrently, or the blocks or steps may sometimes be performed in reverse order according to the corresponding function.

In order to solve the problem caused by the conventional method of rotating the PIR sensor, the present invention implements a system for detecting a stationary and moving human body using a camera shutter type chopper. The sensing system implemented in accordance with the present invention may be implemented as an independent system or as a module of another system. In the sensing system implemented according to the present invention, a small shutter is used and an MCU (Micro Controller Unit) is used to solve the noise problem of the shutter ON / OFF.

Hereinafter, a moving and stopping human body detecting system using a shutter-type chopper according to the present invention will be described in detail with reference to FIGS. 5 to 7. FIG.

FIG. 5 shows a block diagram of a moving and stopping human body detection system using a shutter-type chopper according to the present invention. 5, the monitoring system according to the present invention includes a Fresnel lens 110, a chopper 140, a PIR sensor 100, an interface 120, an MCU 130, a Micro Control Unit ).

The operation principle of the surveillance system according to the present invention is that the chopper 140 is kept open while the person is not present (when no human body is detected) And the chopper 140 is repeatedly opened and closed to sense the stationary human body. If there is no human body to be sensed, the chopper 140 is kept in the open state to detect the moving human body.

5, a moving and stationary human body detecting system using a shutter type chopper according to the present invention includes a chopper (not shown) capable of blocking infrared rays between a PIR sensor 100 and a Fresnel lens 110 performing an infrared ray condensing function 140) is placed in the sensor module. The chopper 140 used in the moving and stopping human detection sensor module using the shutter type chopper according to the present invention performs opening and closing operations on the same principle as the shutter of the camera.

When the PIR sensor 100 outputs a detection signal, the interface 120 amplifies, filters and digital-converts the detection signal and transmits the signal to the MCU 130. The MCU 130 controls the load 150 And outputs a control signal for opening and closing the chopper 140. In addition, The MCU 130 receives a sensing signal of the PIR sensor 100 from the interface 120 and drives a program for controlling the opening and closing of the chopper 140 accordingly.

In the prior art, the PIR sensor 10 does not output a detection signal when the infrared ray is projected and outputs a sensing signal, then reacts with air ions to become a thermal equilibrium state and the infrared ray projection is stopped or the projection amount is not changed The chopper 140 positioned between the PIR sensor 100 and the lens 110 is opened and closed at a predetermined time interval to reset the thermal equilibrium state of the PIR sensor 100 so that the same amount The PIR sensor 100 continuously outputs a detection signal.

The moving and stationary human body detection sensor module using the shutter type chopper according to the present invention includes a Fresnel lens 110 for condensing infrared rays radiated from a human body, an infrared sensor 130 for detecting infrared rays condensed by the Fresnel lens 110, The PIR sensor 100 is disposed between the Fresnel lens 110 and the PIR sensor 100 and is opened or closed in response to a human body detection signal of the PIR sensor 100 to be incident on the PIR sensor 100. [ A chopper 140 of a shutter type for blocking infrared rays may be provided in the form of being mounted on a barrel (not shown).

The barrel can mount a connection part for connecting the PIR sensor 100 and an external device, and packages the sensing sensor module according to the present invention.

At this time, the lens barrel may be composed of two or more members which can adjust the distance between the Fresnel lens 110 and the PIR sensor 100 and adjust the focal distance so as to be foldable or rotationally adjustable.

The control program of the MCU 130 opens and closes the chopper 140 once every predetermined time to continuously return the thermal equilibrium state of the PIR sensor 100 to the initial value. In addition, the control program of the MCU 130 stops the opening and closing of the chopper 140 to minimize power consumption when the human body is not sensed within a predetermined time, and starts opening and closing again when the human body is sensed again after the opening and closing is stopped . A control method according to the control program of the MCU 130 will be described below in detail with reference to FIG.

Meanwhile, since the PIR sensor 100 used in the sensing system according to the present invention senses the heat corresponding to 36 ° C generated in the human body as a differential type and outputs a very weak 1 Hz AC signal, The load 150 or the MCU 130 can not be driven. Therefore, in order to generate a driving signal to the MCU 130, a complicated analog circuit including an amplifier having a high gain, an amplifier having a bandwidth of 1 Hz, and a window comparator should be used.

Recently, the semiconductor device BD9251FV for PIR sensor having such a function has been introduced in Rohm Company, and this device is used in one embodiment of the present invention because it can be miniaturized. A detailed description of this element is omitted here.

An example of an overall circuit diagram of a moving and stopping human body detection system using a shutter-type chopper according to the present invention is shown in FIG. The circuit diagram of FIG. 6 is an example of implementing the block diagram of FIG. 5. In one embodiment according to the present invention, Rohm's BD9251FV is used as the sensor interface 120, and MC97F1104 of the Above semiconductor is used as the MCU 130 . OCD (On-Chip Debugger) 160 is connected between the PC 170 and the MCU 130 for on-chip programming to develop a program. The LED is used as the load 150 to detect whether or not the human body is sensed, and the RC circuit block 180 is a known technique, so that detailed circuit is not shown separately.

FIG. 7 shows a moving and stopping human body detecting method using a shutter-type chopper according to the present invention. 7 is a control flowchart performed by the MCU 130 in the sensing system according to the present invention. The timer setting time to be described below may vary depending on the time delay characteristic of the PIR sensor 100 used, such as the time when the load such as the sensor is turned on.

Referring to FIG. 7, when the sensing system is activated, the interrupt register is in the ON state, the chopper is in the open state, and the load is in the OFF state in the initial state where the human body is not detected in step 701. In this initial state, it is monitored whether a human body is sensed (step 703). If a human body is sensed, the microcomputer proceeds to step 705 to drive a 5-second timer and turn on the load. The interrupt register is turned on for about 3 seconds The timer is shorter than the timer setting time and is longer than half of the timer setting time), and the chopper is closed.

Then, in step 707, the shutter is released at the moment or after the timer reaches 3 seconds, and the interrupt register is turned on again. If the human body is sensed by performing the second sensing control in step 709, the timer returns to step 705 after completion of the predetermined timer to newly operate the timer of 5 seconds, turn on the load, turn off the interrupt register for about 3 seconds, Close and initialize. Here, the second sensing control in step 709 means a step in which the PIR sensor 100 newly detects the human body through the opening and closing of the chopper in steps 705 and 707.

On the other hand, if there is no human body detected during the second sensing operation in step 709, the process proceeds to step 711 and the timer is operated for the remaining 2 seconds. If the timer is terminated, the initial state of step 701 is returned to turn on the interrupt register, And controls the load to be turned off. If it is determined that the human body is not detected during the remaining timer setting time (2 seconds) in step 711, the controller may be controlled to return the loop to step 703, which is the first detection step, in steps 709 and 711 have.

According to the control algorithm as described above, the moving and stopping human detection system using the shutter-type chopper according to the present invention can detect a moving body as well as a stationary human body.

In addition, the moving and stationary human body detection sensor module using the shutter-type chopper according to the present invention can realize quietness and miniaturization without generating noise for detection of moving and stopping human body, It is possible to stop opening and closing the chopper to minimize power consumption.

In addition, the moving and stationary human body detecting module and the sensing system using the shutter-type chopper according to the present invention are more intelligent than the existing sensors, so that the presence or absence of the human body in the sensing range can be accurately outputted, Of course, there is an advantage in that it can be applied in various forms including various electronic devices which need to be driven only when there is a person.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (11)

delete A human body detection system comprising at least a pyroelectric infrared (PIR) sensor,
A Fresnel lens for condensing infrared rays radiated from a human body; a PIR sensor for sensing infrared rays condensed by the Fresnel lens and outputting a detection signal; A chopper of a shutter type which is opened or closed in response to a human body detection signal of the PIR sensor and blocks infrared rays incident on the PIR sensor and a connection unit which connects the Fresnel lens, the PIR sensor, the chopper, And a barrel made of at least two or more members for adjusting a focal distance by adjusting a distance between the Fresnel lens and the PIR sensor; A control unit for outputting an open / close control signal when a sensing signal of the PIR sensor is present; And an interface unit for amplifying and filtering the human body detection signal of the PIR sensor and applying the amplified and filtered human body detection signal to the controller,
Wherein,
The interrupt register is turned on and the chopper is opened to wait for human body detection, and when the PIR sensor that senses a human body outputs a first human body detection signal, it starts a timer for counting a predetermined time, Controls the chopper to close, controls the interrupt register to be turned on after a predetermined time shorter than the predetermined time, opens the chopper, and controls the PIR The timer is started to count the predetermined time again after the timer is terminated when the sensor outputs the second human body detection signal, the interrupt register is turned off, the chopper is closed, and the timer The interrupt register is turned on, and if the second human body detection signal is not received from the PIR sensor, Wherein the controller controls to stop opening and closing the chopper when a human body detection signal is not output from the PIR sensor for a predetermined time after the lapse of the timer count time. Human body detection system. delete delete delete delete delete delete delete delete delete

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