KR20230086644A - Microwave sensor that blocks electromagnetic waves in a specific band and electrical equipment having the same - Google Patents

Abstract

Disclosed is a microwave sensor that blocks electromagnetic waves of a specific band. The microwave sensor for blocking electromagnetic waves of a specific band of the present invention includes a board part on which various electronic parts are mounted, a control part mounted on the board part and detecting the motion of an object to generate various control signals for controlling electric devices, and a control part. An input terminal and an output terminal are connected to some of the plurality of terminals of the band cut filter unit for blocking a specific band among the electromagnetic waves received by the sensor, and a microwave transmitting and receiving antenna installed on the substrate unit to transmit and receive microwave signals.

Description

Microwave sensor that blocks electromagnetic waves in a specific band and lighting device having the same {Microwave sensor that blocks electromagnetic waves in a specific band and electrical equipment having the same}

The present invention relates to a microwave sensor and an electric device having the same, and relates to a microwave sensor that blocks electromagnetic waves of a specific band to prevent malfunctions of electric appliances, etc. caused by electromagnetic interference occurring around the sensor, and It relates to an electric device having the same.

Recently, with the development of various sensor technologies, networking technologies, and Internet of Things technologies, cases in which smart lighting fixtures are applied in homes or companies are increasing. The smart lighting fixture may recognize a user's motion and operate to automatically turn on or off the light. Since the microwave sensor is mounted on the smart lighting fixture, the user can recognize an approaching situation and turn the lighting fixture on or off. In addition, in addition to smart lighting fixtures, microwave sensors are widely used as sensors for controlling the operation of electric devices by detecting a user's approach.

Looking in detail with reference to FIG. 1, as shown in FIG. 1 (a), when the user moves close to the microwave sensor, the microwave sensor recognizes the user's approach and turns on the lighting fixture. ) generates a control signal that controls to

As shown in FIG. 1 (b), when the user moves away from the microwave sensor and moves out of the critical distance, the microwave sensor recognizes the user's departure and controls the lighting fixture to turn off. A control signal may be generated to control the lighting device.

Problems can arise if the microwave sensor malfunctions. Figure 2 (a) shows an example in which electric wires or electric devices are located adjacent to the lighting fixture in which the microwave sensor is installed. Due to the electromagnetic influence generated from electric devices around the lighting fixture, the microwave sensor may malfunction in that the lighting fixture is turned on due to the electromagnetic influence even when the motion of the object is not sensed.

In the past, various attempts have been made to solve the malfunction problem of microwave sensors. Prior Document 1 discloses a technology for providing a motion detection sensor using microwaves that can operate regardless of the influence of surrounding environments such as temperature, humidity, sunlight, and dust. Prior Document 2 is a technology related to a microwave sensor for security monitoring that detects a human body, animal, or object approaching within a certain distance to monitor and determine false alarms or malfunctions due to environmental factors and improves the false alarm rate according to biosignal detection. Initiate. Prior Document 3 discloses a technique related to an RF receiver and an RF signal interference and cancellation method.

However, these existing studies cannot solve the existing problems raised above, and in order to solve these existing problems, the necessity of developing a new type of microwave sensor is required.

Prior Document 1: Korean Patent Registration No. 10-1114820 (Announcement Date: February 15, 2012) Prior Document 2: Korean Patent Registration No. 10-2122636 (Announcement Date: June 15, 2020) Prior Document 3: Korean Patent Publication No. 10-2009-0112052 (published on October 28, 2009)

The present invention, which was made by the above-described need, is a microwave sensor that blocks electromagnetic waves of a specific band to prevent malfunction of electrical devices due to electromagnetic influence of external electrical devices in an environment where electrical devices such as lighting fixtures are installed. And it is an object of the present invention to provide an electric device having the same.

In order to achieve the above object, in the microwave sensor for blocking electromagnetic waves of a specific band according to an embodiment of the present invention, the substrate portion on which various electronic components are mounted; a control unit mounted on the substrate and generating various control signals for controlling electric devices by detecting motion of an object; a band blocking filter unit having an input terminal and an output terminal connected to some of the plurality of terminals of the controller and blocking a specific band among electromagnetic waves received by the sensor; and a microwave transmitting and receiving antenna installed on the substrate to transmit and receive microwave signals.

In this case, the control unit may transmit microwaves to an object through the microwave transmission/reception antenna and receive microwaves reflected from the object to sense the motion of the object.

In this case, the band cut filter unit has a notch to which the OPIN terminal and the first input terminal of the control unit are connected, the OPOUT terminal and the second input terminal of the control unit are connected, and the VOUT terminal and the output terminal of the control unit are connected. Include filters.

In this case, the OPIN terminal is an input terminal of an amplifier mounted inside the control unit, and the OPOUT terminal constitutes an output terminal of the amplifier.

In this case, the substrate unit further includes a button-type switch capable of adjusting the sensing distance of the microwave transceiving antenna in stages, and the button-type switch sequentially increases to a predetermined maximum sensing distance when a button is pressed, and reaches the maximum sensing distance. If an additional button is pressed in the reached state, the detection distance is initialized.

In this case, the OPIN terminal may be an input terminal of an amplifier mounted inside the controller, and the OPOUT terminal may be an output terminal of the amplifier.

Meanwhile, the notch filter may block electromagnetic waves in a band of 60 Hz to 120 Hz.

In this case, the notch filter may be configured as a twin T-type notch filter.

Meanwhile, the band blocking filter unit may further include a low pass filter circuit connected to the notch filter.

In this case, the twin T-type notch filter circuit has an input connected to the OPOUT terminal of the control unit, an output connected to the input terminal of the low-pass filter circuit, and an input terminal of the low-pass filter circuit to the twin T-type notch filter circuit. It is connected to an output terminal of a notch filter circuit, and the low-pass filter circuit includes a first capacitor having one side connected to a first node that is an output node of the twin T-type notch filter, and a second capacitor having the other side connected to the first capacitor. A first resistor having one side connected to a node, a second capacitor having one side connected to a third node to which the other side of the first resistor is connected, and one side to the VOUT terminal of the control unit to which the other side of the second capacitor C2 is connected. A second resistor R2 connected thereto, and a third capacitor C3 having one side connected to the second node to which the other side of the second resistor R2 is connected and the other side connected to ground.

An electronic device having a microwave sensor that blocks electromagnetic waves of a specific band according to another embodiment of the present invention includes a substrate portion on which various electronic components are mounted; a control unit mounted on the substrate and generating various control signals for controlling electric devices by detecting motion of an object; a band blocking filter unit having an input terminal and an output terminal connected to some of the plurality of terminals of the controller and blocking a specific band among electromagnetic waves received by the sensor; and a microwave transmitting/receiving antenna installed on the substrate to transmit/receive microwaves.

According to another embodiment of the present invention, a lighting apparatus having a microwave sensor for blocking electromagnetic waves of a specific band includes a substrate portion on which various electronic components are mounted; a control unit mounted on the substrate and generating various control signals for controlling electric devices by detecting motion of an object; a band blocking filter unit having an input terminal and an output terminal connected to some of the plurality of terminals of the controller and blocking a specific band among electromagnetic waves received by the sensor; and a microwave transmitting and receiving antenna installed on the substrate to transmit and receive microwave signals.

According to various embodiments of the present invention, the lighting fixture equipped with the microwave sensor exhibits robust characteristics from electromagnetic influence among the environmental influences, thereby exhibiting an effect of reducing malfunctions,

In addition, by adopting a structure in which a filter for blocking a specific band receives the signal from the output of the amplifier of the control unit, blocks the band, and then inputs it to the input terminal of the amplifier again, only noise in a specific band is removed without affecting the output reduction. Since it can be removed, it has the effect of maintaining operational reliability.

1 is a diagram schematically illustrating the operating principle of a conventional microwave sensor;
2 is a diagram for explaining an example of a malfunction of a conventional microwave sensor by way of example;
3 is a view illustrating another example of a malfunction of a conventional microwave sensor by way of example;
4 is a diagram illustratively illustrating the appearance of a microwave sensor that blocks electromagnetic waves of a specific band according to an embodiment of the present invention;
5 is a diagram illustratively illustrating the operation of a microwave sensor for blocking electromagnetic waves of a specific band according to an embodiment of the present invention;
6 is a diagram illustratively illustrating a circuit block diagram of a microwave sensor according to an embodiment of the present invention;
7 is a diagram illustratively illustrating a band blocking filter unit of a microwave sensor according to an embodiment of the present invention;
8 is a diagram illustratively explaining the blocking effect of a specific band frequency according to the present invention in comparison with a conventional sensor;
9 is a circuit diagram for explaining in detail a band blocking filter unit performing an operation of blocking electromagnetic waves of a specific band by a microwave sensor according to an embodiment of the present invention;
10 is a view for explaining an example of installing a microwave sensor according to an embodiment of the present invention on the front side of a lighting fixture;
11 is a view for explaining an example of installing a ballast in the lighting luminaire in which the microwave sensor shown in FIG. 10 is installed, and
FIG. 12 is a view illustrating a rear portion of the lighting fixture shown in FIG. 11 by way of example;

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. A preferred embodiment of the present invention described below is only one of various embodiments, and can be variously modified within the scope of the technical idea of the present invention.

microwave sensor

Referring to FIG. 4 , the microwave sensor 100 is mounted on a substrate 110 and a substrate 110 on which various electronic components including a microwave transmission/reception antenna 170 are mounted and detects the motion of an object. An input terminal and an output terminal are connected to some of the plurality of terminals of the control unit 130 and the control unit 130 that generate various control signals and block a specific band among electromagnetic waves received through the microwave transmission and reception antenna 170 It includes a band blocking filter unit 150. Referring to FIG. 4 (a), it is possible to check the planar structure of the microwave sensor 100 that blocks electromagnetic waves of a specific band. Referring to FIG. 4 (b), it is possible to check the bottom structure of the microwave sensor 100 that blocks electromagnetic waves of a specific band.

The microwave sensor 100 according to the present invention may be installed on the front side of the assembly panel of the lighting fixture 200. The microwave sensor 100 can sense the motion of people, animals, cars, etc. existing in a space illuminated by the microwave light fixture 200 through the microwave transmission/reception antenna 170 . The microwave sensor 100 includes a high-frequency oscillation unit for generating high-frequency waves on the substrate unit 110, an amplification unit for amplifying the oscillated high-frequency waves, a transmission antenna for propagating the amplified high-frequency waves into the air, and a microwave sensor 100. The microwave transmission and reception antenna 150 is integrally formed with a reception antenna for receiving propagated high frequencies or high frequencies that collide with and reflect on objects, a frequency synthesizer for synthesizing signals that collide with and reflect on objects and high frequencies that propagate, and this frequency synthesis. It may include an intermediate frequency output unit for outputting a signal by converting the frequency synthesized in the unit into a frequency of the intermediate band.

In this way, the microwave sensor 100 may detect a moving object by the radiated microwave frequency and the intermediate frequency using the Doppler principle. The frequency used at this time uses the range of microwave (GHz), and the intermediate frequency means a frequency obtained by synthesizing a microwave frequency to be radiated and a frequency reflected by an object.

The microwave sensor 100 may include a plurality of antennas, a signal generator, a signal divider, a signal mixer, a filter, a plurality of amplifiers, and a digital converter. The present invention has a configurational feature in that all functional units such as an antenna, amplification, filter, communication, and function setting are modularized into one and designed on a substrate including a microwave transmission and reception antenna.

5 is a diagram illustratively illustrating an operation of a microwave sensor for blocking electromagnetic waves of a specific band according to an embodiment of the present invention. Among the plurality of antennas provided on the substrate unit 110, a first antenna is for outputting a signal to the outside, and a second antenna is for inputting a signal from the outside.

The microwave sensor 100 may improve a recognition distance with an external subject (eg, a person) by using the first and second antennas. Depending on the embodiment, the microwave sensor 100 may be configured by integrating the first and second antennas into one antenna.

The first antenna and the second antenna may be designed as microstrip 2X1 phased array antennas. The radiation characteristics of the antenna may vary depending on the arrangement type, the relative position of the elements, the radiation pattern of each element, and the relative size and phase of the unit element distribution current.

When forming an array of the first and second antennas, the distance between the first and second antennas is one of the important factors that greatly affect the efficiency of the antennas, which are gain, directivity, and beam width. width) and the location of the grating lobe. For example, if the distance between the first antenna and the second antenna is too close, mutual coupling may occur and the gain and efficiency of the antenna may be deteriorated, that is, the side lobe level may be increased and the main beam may be shifted. can be, and a zero point (null) can be generated. Therefore, since a change in antenna characteristics and a difference in gain are caused by mutual interference according to the distance between the first antenna and the second antenna, the interval between the first and second antennas can be determined as an optimal distance by analyzing the characteristics of the change. .

Preferably, the microwave sensor 100 may be designed to minimize matching loss by optimizing impedance matching between the first antenna and the second antenna during design. The first antenna outputs a part of the signals distributed through the signal splitter among the signals generated by the signal generator to the outside. A signal output to the outside by the first antenna is reflected from an external subject and returned, and the second antenna receives a signal reflected from an external subject and returned. The first amplifier amplifies the signal input by the second antenna. The size of a signal reflected from an external subject such as a person or object is very small and uses the Doppler effect. At this time, the reflected frequency is very small, and this is called an if signal. Since the IF frequency of a human walking speed and a vehicle at low speed (30 km/s) has a band range of several Hz to hundreds of Hz, the first amplifier amplifies the frequency level of the signal input by the second antenna.

In the case of the present invention, the signal output from the amplifier is input to the input of the band-stop filter unit 150, and the signal processed by the band-stop filter unit 150 is put back into the input of the amplifier. In this way, it is possible to amplify a signal received through an antenna and filter a specific band among the amplified signals, thereby blocking electromagnetic waves of a specific band causing malfunction of the lighting fixture. The signal mixer mixes the signal amplified through the amplifier and the remaining signals distributed through the signal divider. That is, the signal mixer mixes the signal transmitted through the microwave sensor and the received signal, and among the signals generated in the signal generator, the remaining signals distributed through the signal divider and not output to the outside through the first antenna, A signal input through the second antenna and amplified through the amplifier is mixed. Here, a frequency difference between the two signals can be obtained by mixing the transmitted signal and the received signal reflected from the external subject. Using the frequency difference value thus obtained, the controller 130 may obtain information about a distance to an external subject. It is possible to determine whether the subject is approaching or moving away.

The filter unit receives the mixed signal from the signal mixer and detects a signal corresponding to a specific frequency. Preferably, the filter unit detects only a desired frequency in order to remove a spurious signal generated by the harmonic frequency of the oscillator, and may be designed as a low pass filter (LPF). The second amplifier receives a signal corresponding to a specific frequency detected by the filter and amplifies the frequency of the signal to an input level that can be received by the digital converter.

The digital converter receives the amplified signal from the second amplifier and converts it into a digital signal. The digital signal output from the microwave sensor 100 is input to the processor. As described above, the microwave sensor 100 outputs some of the signals generated by the signal generator to the outside, receives signals reflected from an external subject and mixes them with the rest of the signals generated by the signal generator. Here, the mixed signal has information about a difference in frequency between a signal transmitted to the outside and a signal received from the outside, and a measurement distance can be calculated based on this information.

Accordingly, the mixed signal may be processed through a filter, a second amplifier, and a digital converter, and then provided to a processor to calculate a distance to an external subject, that is, a measurement distance. The processor receives the signal converted to digital by the digital converter of the microwave sensor 100 and calculates the measurement distance. Preferably, the processor calculates a difference frequency using FFT (Fast Fourier Transform) based on the signal provided from the microwave sensor 100, and calculates a measurement distance based on the difference frequency.

Here, the difference frequency corresponds to a frequency difference between a signal transmitted through the microwave sensor 100 and a signal received. Preferably, the method of calculating the difference frequency is, for example, when it is assumed that an external subject is stationary at a distance R away from the microwave sensor 100, the microwave sensor 100 is linearly When a frequency-modulated signal is transmitted, it is reflected by a subject at a distance R and received by the microwave sensor 100 after a time delay of 2R/c. At this time, when the transmitted signal and the received signal, that is, the signal output to the outside through the first antenna and the signal input from the outside through the second antenna are mixed, the processor receives the output signal of the microwave sensor The difference frequency can be calculated as in Equation 1 below.

Here, fr is a frequency shift due to time delay, that is, a difference frequency, B is a sweep bandwidth, Tm is a sweep time, and C is a round trip delay. Next, the processor may calculate the distance R to the subject by Equation 2 based on fm calculated by Equation 1.

Here, R is the distance, B is the sweep bandwidth, Tm is the sweep time, C is the round trip delay, and fr is the frequency shift due to the time delay.

band cut filter

6 is a diagram illustrating a circuit block diagram of a microwave sensor according to an embodiment of the present invention by way of example. Referring to FIG. 6 , the microwave sensor 100 may further include a band blocking filter 150 for blocking a specific band.

The band cut filter 150 is connected to the amplifier output terminal (OPOUT) of the controller 130 of the microwave sensor 100, and hum noise generated from electricity included in the signal transmitted through it is 60 Hz (in some countries, 50 Hz) can be filtered. Since the hum noise is located in a frequency band of several tens of Hz to several hundred Hz, the band blocking filter unit of the present invention is implemented as a notch filter to remove the hum noise signal.

That is, in the band blocking filter 150 of the present invention, a specific band (tens of Hz to hundreds of Hz) is the main frequency band of the electromagnetic interference signal generated in the electrical device, and the signal belonging to this frequency band is the microwave sensor 100 Since it is not an area overlapping with the signal band to be processed and it is a band that causes malfunction, it can be removed using a notch filter. By embedding the band-stop filter 150 in the microwave sensor 100, it is possible to block hum noise without configuring a separate external circuit, thereby preventing malfunction of the microwave sensor from external electromagnetic influences.

This band blocking filter unit 150 performs a different function from the filter unit described above. That is, the band blocking filter unit 150 operates to block electromagnetic interference signals of a specific band (tens of hertz (Hz) to hundreds of hertz (Hz)), but in the case of the filter unit, a filtering operation is performed to select a specific band There is a functional difference in that

A feature of the configuration of the present invention is that the band cut filter unit 150 is connected to the output terminal of the amplifier of the control unit 130, and a signal from which a specific band has been deleted is input to the input terminal of the amplifier while at the same time the output terminal of the control unit 130 is connected. By connecting to , it is configured so that output loss does not occur while faithfully blocking a specific band.

7 is a diagram illustratively illustrating a band blocking filter unit of a microwave sensor according to an embodiment of the present invention. Referring to FIG. 7 , a band blocking filter unit 150 may be formed in one region of the substrate unit 110 . A detailed configuration of the band blocking filter unit 150 will be described below with reference to separate drawings.

8 is a diagram illustratively explaining the blocking effect of a specific band frequency according to the present invention in comparison with a conventional sensor. Referring to FIG. 8 (a), according to the present invention, electromagnetic waves having a frequency in a specific band (eg, tens of hertz (HZ) to hundreds of hertz (HZ)) are blocked, thereby generating electromagnetic waves having a frequency of a specific band. By reducing hum noise, it has a remarkable effect of preventing malfunction of electrical equipment.

On the other hand, referring to FIG. 8(b), since the blocking ratio in a specific band according to the conventional method is not higher than that of the present invention, the problem of reducing the hum noise reduction effect still exists.

9 is a circuit diagram for explaining in detail a band blocking filter unit performing an operation of blocking electromagnetic waves of a specific band by a microwave sensor according to an embodiment of the present invention. Referring to FIG. 9 , the band-stop filter unit 150 may include a notch filter and a low-pass filter. The notch filter is configured to filter signals of several tens of Hz to hundreds of Hz, which is a specific band, and the low pass filter is configured to output signals in a low-pass region among signals from which a specific band has been removed.

The notch filter may be composed of a twin T-shaped notch filter. At the output terminal (VOUT) of the amplifier, a first circuit in which two resistors (RE 14 and RE 15) and one capacitor (C 26) are connected in a T-type manner, two capacitors (C 18 and C 22) and one A twin T-type notch filter can be configured by connecting the second circuit in which the resistor RE 15 is connected in a T-type manner in a twin manner. The notch filter configured in this way can block electromagnetic waves of a specific band (eg, tens of Hz to hundreds of Hz). In this way, a low-pass filter passes through a signal for which a specific band is blocked.

In the low-pass filter, a first capacitor C27 is connected between the first node Node 1 and the second node Node2, and a first resistor RE is connected between the second node Node2 and the third node Node3. 18) is wired. A second capacitor C29 is connected between the second node Node2 and the ground, and a second resistor RE 23 is connected between the second node Node2 and the output terminal VOUT of the controller 120. A third capacitor C28 is connected between the third node Nodd3 and the output terminal VOUT of the control unit 120 .

10 is a view for explaining an example of installing a microwave sensor according to an embodiment of the present invention on the front side of a lighting fixture. Referring to FIG. 10 , since the microwave sensor 100 of the present invention supports a standard communication interface (eg, I2C), it can be confirmed that it can be directly installed in the lighting fixture 200 without adding a separate circuit. Specifically, a plurality of lighting elements 220 are arranged radially on the lighting luminaire panel 210 . A control unit including a lighting PCB board 230 having a hole processed in the center of the lighting luminaire panel 210 and including electronic components for supplying power to the lighting device 220 or controlling on/off to the corresponding hole. make up A portion of the lighting PCB board 230 has a connector 240 electrically connected to the microwave sensor 100 .

FIG. 11 is a view for explaining an example of installing a ballast in a lighting luminaire in which the microwave sensor shown in FIG. 10 is installed. Referring to FIG. 11 , the cover portion 250 covering the microwave sensor 100 installed on the lighting PCB substrate 230 may be finished.

FIG. 12 is a view illustrating a rear portion of the lighting fixture shown in FIG. 11 by way of example. Referring to FIG. 12, the opposite side of the lighting luminaire panel 210 includes an installation housing part 260 so that the lighting fixture can be installed on the installation surface, and the back side of the installation housing part 260 includes a power supply unit 270. do. In the case of the present invention, even if the distance between the power supply 270 and the microwave sensor 100 is configured to be fairly close, the power supply 270 does not cause malfunction of the microwave sensor 100, so the present invention The microwave sensor 100 of can exert a remarkable effect of reducing operation errors due to hum noise without installing additional components to existing lighting fixtures.

100: microwave sensor
110: board part
130: control unit
150: band cut filter unit
170: microwave transmit and receive antenna
190: connector
200: lighting luminaires

Claims (4)

In the microwave sensor for blocking specific band electromagnetic waves,
a substrate portion on which various electronic components are mounted;
a control unit mounted on the substrate and generating various control signals for controlling electric devices by detecting motion of an object;
a band blocking filter unit having an input terminal and an output terminal connected to some of the plurality of terminals of the controller and blocking a specific band among electromagnetic waves received by the sensor; and
A microwave transmission and reception antenna installed on the substrate to transmit and receive microwave signals;
The control unit transmits microwaves to an object through the microwave transmission and reception antenna, receives microwaves reflected from the object, and senses the motion of the object;
The band-cutting filter unit connects the OPIN terminal and the first input terminal of the control unit, connects the OPOUT terminal and the second input terminal of the control unit, and connects the VOUT terminal and the output terminal of the control unit to 60 Hz to 120 Hz band. A twin T-type notch filter for blocking electromagnetic waves and a low-pass filter circuit connected to the twin T-type notch filter,
The OPIN terminal is an input terminal of an amplifier mounted inside the controller, and the OPOUT terminal is a microwave sensor for blocking electromagnetic waves of a specific band, characterized in that the output terminal of the amplifier.
According to claim 1,
The twin T-type notch filter circuit has an input connected to the OPOUT terminal of the control unit and an output connected to the input terminal of the low-pass filter circuit,
The input terminal of the low-pass filter circuit is connected to the output terminal of the twin T-type notch filter circuit,
The low-pass filter circuit includes a first capacitor having one side connected to a first node which is an output node of the twin T-type notch filter, a first resistor having one side connected to a second node to which the other side of the first capacitor is connected, A second capacitor having one side connected to a third node to which the other side of the first resistor is connected, a second resistor R2 having one side connected to the VOUT terminal of the control unit to which the other side of the second capacitor C2 is connected, Characterized in that it comprises a third capacitor (C3), one side of which is connected to the second node to which the other side of the second resistor (R2) is connected and the other side is grounded.
A microwave sensor that blocks specific band electromagnetic waves.
a substrate portion on which various electronic components are mounted;
a control unit mounted on the substrate and generating various control signals for controlling electric devices by detecting motion of an object;
a band blocking filter unit having an input terminal and an output terminal connected to some of the plurality of terminals of the controller and blocking a specific band among electromagnetic waves received by the sensor; and
A microwave transmission and reception antenna installed on the substrate to transmit and receive microwave signals;
The control unit transmits microwaves to an object through the microwave transmission and reception antenna, receives microwaves reflected from the object, and senses the motion of the object;
The band-cutting filter unit connects the OPIN terminal and the first input terminal of the control unit, connects the OPOUT terminal and the second input terminal of the control unit, and connects the VOUT terminal and the output terminal of the control unit to 60 Hz to 120 Hz band. A twin T-type notch filter for blocking electromagnetic waves and a low-pass filter circuit connected to the twin T-type notch filter,
The OPIN terminal is an input terminal of an amplifier mounted inside the control unit, and the OPOUT terminal is an electronic device having a microwave sensor for blocking electromagnetic waves of a specific band, characterized in that the output terminal of the amplifier.
a substrate portion on which various electronic components are mounted;
a control unit mounted on the substrate and generating various control signals for controlling electric devices by detecting motion of an object;
a band blocking filter unit having an input terminal and an output terminal connected to some of the plurality of terminals of the controller and blocking a specific band among electromagnetic waves received by the sensor; and
A microwave transmission and reception antenna installed on the substrate to transmit and receive microwave signals;
The control unit transmits microwaves to an object through the microwave transmission and reception antenna, receives microwaves reflected from the object, and senses the motion of the object;
The band-cutting filter unit connects the OPIN terminal and the first input terminal of the control unit, connects the OPOUT terminal and the second input terminal of the control unit, and connects the VOUT terminal and the output terminal of the control unit to 60 Hz to 120 Hz band. A twin T-type notch filter for blocking electromagnetic waves and a low-pass filter circuit connected to the twin T-type notch filter,
The OPIN terminal is an input terminal of an amplifier mounted inside the control unit, and the OPOUT terminal is a lighting fixture having a microwave sensor for blocking electromagnetic waves of a specific band, characterized in that the output terminal of the amplifier.

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