KR102213956B1 - Doppler sensor and standby power cut off outlet device using the same - Google Patents

Abstract

The present invention relates to a Doppler sensor sensing a movement of a human body and an outlet device using the sensor in order to cutoff standby power when no human body is sensed. The Doppler sensor includes: a signal generating unit mounted on a substrate and generating a set reference signal; an antenna unit mounted on the substrate, transmitting the reference signal generated by the signal generating unit, and receiving a wireless signal from the outside; a filter unit filtering a human body sensing signal corresponding to human body sensing from the wireless signal; an amplification unit amplifying the signal outputted from the filter unit; and a control unit determining whether or not the human body is sensed based on the amplified signal. The antenna unit includes a first pattern patterned in an S-form on the upper surface of the substrate and a second pattern patterned in an S-form on the lower surface of the substrate so as to match the S-form of the first pattern on the upper surface. The first and second pattern are electrically connected and a 1.8 GHz band frequency signal is transmitted and received through a plurality of via holes formed so as to penetrate the first pattern, the substrate, and the second pattern.

Description

Doppler sensor and standby power cut off outlet device using the same

The present invention relates to a Doppler sensor that detects a human body, and an outlet device that blocks standby power when the human body is not detected using the same.

PIR (Pyroelectric Infrared) sensor (also known as PIR motion sensor) is a representative human body detection sensor widely used in many industrial fields. Such a PIR sensor is an infrared motion sensor and has an advantage of being able to detect a human body even in a dark surrounding environment, but has a short detection distance and a problem in that it is difficult to detect when body temperature is blocked.

As a sensor to improve this, a Doppler sensor using the Doppler effect is used. The Doppler effect refers to a phenomenon in which the wavelength of the electromagnetic wave measured by the observer is different from the laboratory wavelength when an object emitting electromagnetic waves moves closer or farther away from the observer.

Doppler sensors include microwave Doppler sensors and transmissive ultrasonic Doppler sensors.

The micro Doppler sensor is a sensor using the principle that the wavelength of the microwave is observed differently compared to the case where there is a relative motion between the radiation source of the microwave and the object when it is stopped, and can be used to continue the movement and speed of a moving object.

The transmissive ultrasonic Doppler sensor is a sensor using the Doppler effect of ultrasonic waves emitted from the ultrasonic generator by disposing an ultrasonic generator and a receiver on opposite sides with an object between them.

The conventional Doppler sensor transmits a high frequency of 2.4 GHz or more, which is periodically generated, to a transmitting antenna and detects it by a receiving antenna to determine whether an object is moving.

However, in order to transmit an electromagnetic wave of 2.4 GHz or more, the size of the circuit is increased by that amount, and a separate circuit element antenna and a mechanical element antenna must be provided, thereby increasing power consumption.

This is contrary to the demand for miniaturization of PCB boards equipped with Doppler sensors and reduction of manufacturing cost due to the recent trend of miniaturization of electronic devices and the demand to consider appearance design as important.

On the other hand, a standby power cut-off outlet using such a human body detection sensor is disclosed. Standby power refers to electricity consumed when a home appliance is plugged in even when not in use. This standby power is a factor that wastes a lot of energy in most home appliances.

Conventionally, a Doppler sensor implementing a transmitting antenna using a trap coil and a standby power cut-off outlet using the same are disclosed. In the case of such a Doppler sensor, the volume increases and power consumption increases due to the size of the trap coil.

Registered Patent No. 10-0009597 Registered Patent No. 10-1807774 Registered Patent No. 10-1838741

An object of the present invention is to provide a Doppler sensor capable of reducing the size and manufacturing cost of a sensor and reducing power consumption by eliminating the need to attach a separate circuit element antenna and a mechanical element antenna, and a standby power cut-off outlet device using the same. .

An object of the present invention is to provide a Doppler sensor that can propagate electromagnetic waves in a 1.8 GHz band, transmit power lower than that of a conventional Doppler radar, and a miniaturized Doppler sensor and a standby power cut-off outlet device using the same.

An object of the present invention is to provide a standby power cut-off outlet device that effectively senses a human body by applying a Doppler sensor of a weak electric field type in a 1.8 GHz band and automatically cuts off standby power while there is no human body detection.

An object of the present invention is to provide a standby power cut-off outlet device capable of using power by releasing the standby power cut-off mode when a human body is detected while the standby power is cut off.

An object of the present invention is to provide a Doppler sensor that can be used for PCB modularization or original board mounting by installing an S-shaped pattern antenna on the front and rear sides of a PCB board, and a standby power cut-off outlet device using the same.

A Doppler sensor according to an embodiment of the present invention includes: a signal oscillation unit mounted on a substrate to generate a set reference frequency signal; An antenna unit mounted on the substrate to transmit a reference frequency signal generated by the signal oscillation unit and receive a radio frequency signal from the outside; A filter unit for filtering a human body detection signal corresponding to human body detection from the radio frequency signal; An amplifying unit amplifying the signal output from the filter unit; And a control unit for determining whether a human body is detected based on the amplified signal, and the antenna unit includes a first pattern patterned in an S shape on an upper surface of the substrate and a first pattern on the upper surface on a lower surface of the substrate. Consisting of a second pattern patterned in an S-shape to match the S-shape, the first and second patterns are electrically connected to each other through a plurality of via holes formed to penetrate the first pattern, the substrate, and the second pattern. It is connected, and it is designed to transmit and receive frequency signals in the 1.8GHz band of the weakly developed method.

In the present invention, the antenna unit transmits and receives a frequency signal of 1.80 to 1.86 GHz.

In the present invention, the plurality of via holes formed in the first and second patterns are each formed in a circular shape, the diameter of the circular shape is 1 mm, and the spacing of the adjacent circles is 0.5 to 0.6 mm.

In the present invention, the first and second patterns are electrically connected through at least one or more via holes among the plurality of via holes.

In the present invention, the first and second patterns patterned in the S-shape are formed as lines having a width of 1 to 1.3 mm, and the total horizontal and vertical widths of the first and second patterns are 9 to 10 mm. to be.

In addition, a standby power cut-off outlet device according to an embodiment of the present invention includes the Doppler sensor described above; An outlet connected to supply a commercial voltage; A switch for supplying and blocking the commercial voltage supplied to the outlet; An outlet control unit that turns on the switch so that the commercial voltage is applied to the outlet when the human body detection signal is output from the Doppler sensor, and turns off the switch so that the commercial voltage is not applied to the outlet when the human body detection signal is not output Includes.

In the present invention, the control unit turns off the switch when the human body detection signal is not output from the Doppler sensor for a predetermined time or longer.

According to the present invention, since there is no need to attach a separate circuit element antenna and a mechanical element antenna, the size of the Doppler sensor can be reduced to make the size of the Doppler sensor smaller, thereby making it easy to insert into a small product.

According to the present invention, since a Doppler sensor that transmits and receives a frequency signal in the 1.8 GHz band of a weakly developed method is used, transmission power is lower than that of a conventional Doppler radar.

According to the present invention, a human body is sensed using a Doppler sensor, and standby power is automatically cut off while there is no human body detection, and when a human body is detected, the standby power cut-off mode is canceled so that power can be used.

In the present invention, by installing the S-shaped pattern antenna on the front side and the rear side of the PCB substrate, respectively, it can be utilized for PCB modularization or original board mounting.

1 is a block diagram of a Doppler sensor according to an embodiment of the present invention.
2 is an exemplary view of implementing a Doppler sensor on a substrate according to an embodiment of the present invention.
3 is an enlarged view of first and second patterns constituting an antenna unit according to an embodiment of the present invention.
4 is a partial enlarged view of a cross section of an antenna unit mounted on a substrate according to an exemplary embodiment of the present invention.
5 is a block diagram of a standby power cut-off outlet device according to an embodiment of the present invention.
6A and 6B are exemplary views of a conventional antenna pattern for performance comparison with an S-shaped antenna unit according to the present invention.
7 and 8 are experimental examples of experimentally checking the frequency of a radio signal applied to a Doppler sensor according to an embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, and only these embodiments make the disclosure of the present invention complete, and are common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a Doppler sensor according to an embodiment of the present invention.

Referring to FIG. 1, the Doppler sensor 110 according to the present invention includes a signal oscillation unit 112, an antenna unit 113, a filter unit 114, an amplification unit 115, and a sensor control unit 116. I can. These components 112 to 116 may be preferably mounted on the substrate 111.

The substrate 111 may be a printed circuit board (PCB) on which a plurality of electronic devices can be mounted. In this embodiment, as described above, a plurality of components 112 to 116 for configuring the Doppler sensor 110, and various electronic devices and circuits required to drive the Doppler sensor 110 are additionally mounted. May be. In this case, these components 112 to 116 may be mounted on one surface and/or the other surface of the substrate 111.

The signal oscillation unit 112 may be mounted on one surface of the substrate 111 and may output a frequency signal with a voltage applied from the outside. In this embodiment, the signal oscillator 112 may be, for example, a voltage controlled oscillator (VCO). Here, the signal oscillator 112 may generate a reference frequency signal of a set frequency band.

The antenna unit 113 may be mounted on the substrate 111 and transmit the reference frequency signal generated by the signal oscillator 112 to the outside and receive a radio frequency signal from the outside. The antenna unit 113 may be patterned on the substrate 111 in a radiation pattern.

In this embodiment, the antenna unit 113 may be patterned and mounted on the upper and lower surfaces of the substrate 111 in an S shape, respectively. Specifically, the antenna unit 113 includes a first pattern 113a patterned in an S shape on the upper surface of the substrate 111 and an S of the first pattern 113a on the lower surface of the substrate 111. The second pattern 113b may be patterned in an S-shape of the same size and shape to match the shape of the shape.

The filter unit 114 may filter a human body detection signal corresponding to human body detection from the radio frequency signal received by the antenna unit 113. The filter unit 114 may include a low-pass filter (LPF), and may extract a human body detection signal of a specific frequency included in the received radio frequency signal.

The amplification unit 115 may amplify a signal output from the filter unit 114. This is to amplify when the intensity of the signal filtered by the filter unit 114 is small, thereby improving detection performance.

The sensor control unit 116 may determine whether to detect a human body based on the signal amplified by the amplification unit 115.

As described above, when there is a movement of a person around the Doppler sensor 110 of the present invention or when there is no movement of a person, the presence or absence of a human body detection signal in the radio frequency signal received through the antenna unit 113 is checked to determine whether the human body is detected. It can be.

2 is an exemplary diagram of implementing a Doppler sensor on a substrate according to an embodiment of the present invention.

Referring to FIG. 2, the Doppler sensor 110 according to an embodiment of the present invention includes a signal oscillation unit 112, a first pattern 113a, a filter unit 114, and an amplification unit 115 on the upper surface of the substrate 111. Is mounted, and the second pattern 113b and the sensor control unit 116 may be mounted on the lower surface of the substrate 111.

As shown in the drawing, the first pattern 113 is installed on the upper surface of the substrate 111 and the second pattern 113b is installed on the lower surface of the substrate 111. In this case, it is important that the first pattern 113a and the second pattern 113b are S-shaped and positioned at positions corresponding to each other in the same shape and size, respectively.

In addition, holes are formed in the first pattern 113a and the second pattern 113b. These holes are formed to penetrate the first pattern 113a, the substrate 111, and the second pattern 113b.

3 is an enlarged view of a first and second pattern constituting an antenna unit according to an embodiment of the present invention, and FIG. 4 is a partially enlarged view of a cross section of an antenna unit mounted on a substrate according to an embodiment of the present invention.

As shown in the drawing, the antenna unit 113 is composed of first and second patterns 113a and 113b. The first pattern 113a is patterned on the upper surface of the substrate 111 and the second substrate 113b is patterned on the lower surface of the substrate 111 that is the opposite surface. In this case, the first and second patterns 113a and 113b are disposed at positions corresponding to each other with the substrate 111 interposed therebetween.

The first and second patterns 113a and 113b each have the same size and shape, and are preferably implemented in an S-shape. At this time, in the S-shaped shape, the line 1131 has a width of 1 to 1.3 mm, and the overall size is preferably 9 to 10 mm in width and height, respectively.

The reason is for the Doppler sensor 110 to transmit and receive a frequency signal in the 1.8 GHz band, preferably 1.80 to 1.86 GHz. More preferably, it transmits and receives a frequency signal of 1.81 to 1.85 GHz. If the width of the S-shaped line 1131 is less than 1 mm, a frequency signal of 1.80 GHz or less may be transmitted and received, and if it exceeds 1.3 mm, a frequency signal of 1.86 GHz or more may be transmitted and received. In addition, when the horizontal and vertical widths are larger than the size of 9 to 10 mm, a frequency signal of 1.86 GHz or more may be transmitted and received.

In addition, as described above, the first and second patterns 113a and 113b are installed at the same position on opposite surfaces with the substrate 111 interposed therebetween. At this time, a plurality of via holes 1132 penetrating all may be formed in the first pattern 113a, the substrate 111 and the second pattern 113b.

Each of the via holes 1132 is formed in a circular shape, and the diameter of the circular shape is preferably 1 mm. And it is preferable that the spacing between adjacent circles is 0.5 to 0.6 mm.

In addition, a conductive material 1133 is formed in the via hole 1132, respectively, and the conductive material 1133 is also connected to the first and second patterns 113a and 113b. Accordingly, the first and second patterns 113a and 113b are electrically connected to each other through the conductive material 1133 formed in the via hole 1132.

With the configuration as described above, the Doppler sensor 110 is designed to transmit and receive wireless signals of 1.80 to 1.86 GHz, which is a weak electric field method, only with a PCB radiation pattern. As described above, the Doppler sensor 110 according to the present invention has a great feature in that it is developed in a weak electric field method (1.8 GHz band) only with a PCB radiation pattern.

Meanwhile, in another embodiment of the present invention, the Doppler sensor 110 may be used in a standby power cut-off outlet device 200.

5 is a block diagram of a standby power cut-off outlet device according to an embodiment of the present invention.

Referring to FIG. 5, the standby power cut-off outlet device 200 according to the present invention may include the Doppler sensor 110, the outlet 220, the switch 230, and the outlet control unit 240 described above.

The Doppler sensor 110 is as shown in FIGS. 1 to 4.

The outlet 220 is a device that supplies power to an electric device and may receive a commercial voltage from the power supply unit 210 and supply power to an electric device connected to the outlet 220.

The switch 230 may serve to supply and cut off commercial power supplied from the power supply 210 to the outlet 220 by being connected between the power supply 210 and the outlet 220.

In this case, when the switch 230 is turned on, the commercial power may be supplied from the power unit 210 to the outlet 220, and when the switch 230 is turned off, the supply of the commercial power may be cut off.

In this embodiment, the switch 230 may be a mechanical switch or an electronic switch. The electronic switch may be, for example, an IGBT or a MOSFET.

The on/off operation of the switch 230 may be controlled by the outlet control unit 240. The outlet control unit 240 may control an on/off operation of the switch 230 according to a signal output from the Doppler sensor 110.

In this embodiment, the Doppler sensor 110 outputs a human body detection signal when a human body is detected, and the outlet control unit 240 turns on the switch 230 when a human body detection signal is received from the Doppler sensor 110 to provide the power supply 210. Commercial power is supplied to the outlet 220.

On the contrary, if a human body detection signal is not output from the Doppler sensor 110, the outlet control unit 240 turns off the switch 230 so that the power supply to the outlet 220 is cut off.

As described above, in the standby power cut-off outlet device 200 according to the present invention, when the Doppler sensor 110 does not detect a human body, the power supply to the outlet 220 is cut off, thereby blocking standby power in an environment without a user. I can.

In addition, when the Doppler sensor 110 detects the human body again, power is supplied to the outlet 220, thereby releasing the standby power cut-off mode, and allowing the electric device to use power through the outlet 220.

On the other hand, although not shown in the drawings, in another embodiment of the present invention, the standby power cut-off outlet device 200 may further include a timer (not shown) for counting the elapse of time.

In this case, the outlet control unit 240 may control the operation of the switch 230 using the elapsed time counted by the timer.

For example, the outlet control unit 240 may turn off the switch 230 when a human body detection signal is not output from the Doppler sensor 110 for a predetermined time or longer.

As described above, the standby power cut-off outlet device 200 according to the present invention is effective at a low cost by using a Doppler sensor including an antenna unit designed in a radiation pattern to transmit and receive wireless signals of a preset low band, that is, 1.80 to 1.86 GHz. Human body detection is possible, and standby power blocking operation can be performed according to whether the human body is detected.

6A and 6B are diagrams illustrating comparison of a conventional antenna pattern for performance comparison with an S-shaped antenna unit according to the present invention.

6A is an example implemented in the shape of a'ㄹ' among Korean consonants, and FIG. 6B is an example implemented in the shape of an English letter'T'.

The present inventors have described the S-shaped antenna according to the present invention shown in FIGS. 1 to 4, the'D'-shaped antenna shown in FIG. 6A, and the'T'-shaped antenna shown in FIG. 6B. The detection distance, detection density, and detection angle were tested, and the results are as follows.

division S shape (invention) D-shape (Fig. 6A) T-shape (Fig. 6b) Winding distance (maximum) 7m 5m 4m Detection density Good No detection width occurs No detection width occurs Detection angle 360 degree 360 degree 290 degrees

As can be seen from Table 1, in the S-shaped antenna, the sensing distance is relatively longer, the sensing density is good, and the sensing angle is 360 degrees.

7 and 8 are exemplary diagrams illustrating an experiment for experimentally checking a frequency of a radio signal applied to a Doppler sensor according to an embodiment of the present invention.

In the experimental result of FIG. 7, radio frequency signals detected by the antenna unit 113 shown in FIGS. 1 to 4 were detected in a frequency band from 1.75 GHz to 1.95 GHz. As can be seen from the figure, it can be seen that a significant result appears in a band of 1.80 to 1.86 GHz, particularly preferably in a band of 1.81 to 1.85 GHz. This means that a frequency signal in the band of 1.81 to 1.85 GHz is detected, and thus, the Doppler sensor of the present invention can transmit and receive the frequency signal in the band.

In addition, the experimental results of FIG. 8 are the results of testing using a spectrum analyzer, and as a result of analysis in the frequency band (1.8 GHz band/-60 dB) of the weak electric field method, at 1.80 to 1.85 GHz (allowable deviation: about 50 MHz) It can be seen that the voltage intensity is approximately 0.6~1.2mV/m, showing a very low value.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above embodiments, but may be manufactured in various different forms, and those skilled in the art to which the present invention pertains. It will be understood that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting.

110: Doppler sensor 111: substrate
112: signal oscillation unit 113: antenna unit
113a: first pattern 113b: second pattern
114: filter unit 115: amplification unit
116: sensor control unit 200: outlet device
210: power supply 220: outlet
230: switch 240: outlet control unit

Claims (7)

A signal oscillator mounted on the substrate and generating a set reference frequency signal;
An antenna unit mounted on the substrate to transmit a reference frequency signal generated by the signal oscillation unit and receive a radio frequency signal from the outside;
A filter unit for filtering a human body detection signal corresponding to human body detection from the radio frequency signal;
An amplifying unit amplifying the signal output from the filter unit;
And a control unit that determines whether a human body is detected based on the amplified signal,
The antenna unit,
Consisting of a first pattern patterned in an S shape on the upper surface of the substrate and a second pattern patterned in an S shape to match the S shape of the first pattern on the upper surface of the substrate, The first pattern and the second pattern are respectively disposed on the upper and lower surfaces of the substrate so as to correspond to each other in the same shape, size, and position with the substrate interposed therebetween, and the first and second patterns have a width of 1 to 1.3 mm. It is formed as an S-shaped line with
The first pattern and the second pattern are electrically connected through a plurality of via holes formed to penetrate all of the first pattern, the substrate, and the second pattern to transmit and receive a frequency signal in the 1.8 GHz band of the weakly developed method, and the first A Doppler sensor in which a plurality of holes formed in the pattern and the second pattern are circular, each having a diameter of 1 mm, and an interval between adjacent circles of 0.5 to 0.6 mm. The method according to claim 1,
The antenna unit is a Doppler sensor designed to transmit and receive a frequency signal of 1.80 ~ 1.86㎓. delete The method according to claim 1,
A Doppler sensor to which the first and second patterns are electrically connected through at least one or more of the plurality of via holes. The method according to claim 1,
Doppler sensor, characterized in that the total horizontal width and vertical width of the first and second pattern is 9 ~ 10mm. The Doppler sensor according to any one of claims 1, 2, 4 or 5;
An outlet connected to supply a commercial voltage;
A switch for supplying and blocking the commercial voltage supplied to the outlet;
An outlet control unit that turns on the switch so that the commercial voltage is applied to the outlet when the human body detection signal is output from the Doppler sensor, and turns off the switch so that the commercial voltage is not applied to the outlet when the human body detection signal is not output Standby power cut-off outlet device comprising a. The method of claim 6,
The control unit,
Standby power cut-off outlet device for turning off the switch when the human body detection signal is not output from the Doppler sensor for a predetermined time or longer.

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