KR20190092347A - Apparatus and Method for Sensing of Human Body Using Coil - Google Patents

Abstract

A device for detecting a human body according to an embodiment of the present invention comprises: a detection unit composed only of a coil, and simultaneously forming capacitance and inductance; a first sensing unit electrically connected to the detection unit in a first sensing mode to sense whether an arbitrary object has approached based on the amount of change in the capacitance; a second sensing unit which receives the amount of change in the capacitance measured by the first sensing unit, and, when it is detected by the first sensing unit that the arbitrary object has approached, is electrically connected to the detection unit in a second sensing mode, before detecting a frequency change from an oscillation signal of a resonance circuit including the detection unit to determine the kind of object which has approached; and a switching unit which allows the detection unit and the first sensing unit to be electrically connected in the first sensing mode while blocking the connection between the detection unit and the second sensing unit, and, when it is converted into a second sensing mode after the approach of the arbitrary object is sensed in the first sensing mode, allows the detection unit and the second sensing unit to be electrically connected while blocking the connection between the detection unit and the first sensing unit. Here, the second sensing unit can be configured to have an oscillation frequency increased when the decreased amount of the inductance is greater than the increased amount of the capacitance as the arbitrary object approaches the detection unit, and to have the oscillation frequency decreased when the increased amount of the capacitance is greater than the decreased amount of the inductance.

Description

Apparatus and Method for Sensing of Human Body Using Coil}

The present invention relates to an object detecting apparatus, and more particularly, to an apparatus and method for detecting a human body using a coil.

Various types of sensors for detecting an object are used. For example, the sensor device may measure temperature, pressure, humidity, sound, gas flow rate, speed, vibration, etc. according to a target to be detected, and may vary in optical, ultrasonic, and capacitive methods according to the measurement method. Can be implemented.

The capacitive sensor device detects an object by using the principle that the capacitance between the detection electrode and the ground provided in the sensor device increases when the detection object approaches or contacts the sensor device.

Capacitive sensor devices can detect any object having a dielectric constant, have strong noise immunity, and are widely used due to their simple configuration and low manufacturing cost.

By the way, since the capacitive sensor device detects only the change in capacitance, it reacts when the change in capacitance becomes more than a certain level by the approach of an object. Therefore, the possibility of detection error cannot be excluded when applied to a specific object, for example a system designed to respond to a human body.

Embodiments of the present technology may provide a human body sensing device and method using a coil capable of distinguishing a conductive object from a human body.

Embodiments of the present technology may provide an apparatus and method for detecting a human body using a coil capable of improving accuracy of human body sensing.

Human body detecting device using a coil according to an embodiment of the present technology comprises a detection unit for forming a capacitance and inductance at the same time consisting of only the coil; A first sensing unit electrically connected to the detecting unit in a first sensing mode to detect whether an object is approached based on an amount of change in capacitance; The resonance circuit includes the capacitance measured by the first sensing unit and is electrically connected to the detecting unit in a second sensing mode when the first sensing unit detects that an object is approached. A second detector configured to detect a frequency change from the oscillation signal of and to determine the type of the approached object; And electrically connect the detector and the first detector in the first sensing mode, cut off the connection between the detector and the second detector, and detect that an object is approaching in the first sensing mode to access the second detector. And a switching unit configured to electrically connect the detection unit and the second detection unit to switch to the detection mode, and cut off the connection between the detection unit and the first detection unit. The oscillation frequency may be increased when the inductance decrease is greater than the capacitance increase due to approaching the detection unit, and the oscillation frequency may be decreased when the capacitance increase is greater than the inductance decrease.

Human body detection method using a coil according to an embodiment of the present technology is a human body detection of the human body sensing device including a detector, the first sensing unit, the second sensing unit and the switching unit consisting of only a coil capable of forming capacitance and inductance at the same time A method comprising the steps of: the switching unit electrically connecting the detection unit and the first detection unit and disconnecting the detection unit from the second detection unit to set a first detection mode; Detecting, by the first sensing unit, whether an object approaches the detection unit based on the capacitance change amount of the detection unit in the first detection mode; Switching off the detection unit from the second detection unit and electrically connecting the detection unit with the first detection unit to switch to the second detection mode when it is detected that an object is approached in the first detection mode. ; Detecting a frequency change from an oscillation signal of a resonant circuit including the detector by the second detector in the second detection mode; And determining the type of the approached object based on the change in frequency; wherein detecting the change in frequency includes a case where the decrease in inductance is greater than the increase in capacitance caused by the arbitrary object approaching the detection unit. The oscillation frequency is increased and detected, and when the capacitance increase is greater than the inductance decrease, the oscillation frequency may be reduced and detected.

According to the present technology, the detection accuracy of the detection target is greatly improved by detecting the target in a hybrid manner in which both the capacitance change and the induced capacitance change are detected. Therefore, it is possible to distinguish whether the approached object is a human body or a conductive object, thereby improving the operation reliability of the system designed to operate in response to the human body.

1 is a block diagram of a human body sensing device using a coil according to an embodiment.
2 is a block diagram of a detector according to an embodiment.
3A and 3B are schematic circuit diagrams of a detector according to an embodiment.
4 is a view for explaining the relationship between the capacitance change amount and the induced capacitance change amount according to the approach of the object.
5 to 8 are configuration diagrams of a human body sensing device according to embodiments.
9A and 9B are diagrams for describing a sensing method in a first sensing mode.
10 is a configuration diagram of a detector according to embodiments.
11 is a flowchart illustrating a human body detecting method according to an exemplary embodiment.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present technology in more detail.

1 is a block diagram of a human body sensing device using a coil according to an embodiment.

Referring to FIG. 1, the apparatus for detecting a human body 10 according to an exemplary embodiment may include a controller 100, a detector 110, a switching unit 120, a first detector 130, and a second detector 140. It can be configured to include.

The controller 100 may be configured to control the overall operation of the human body sensing device 10.

The detection unit 110 is a portion where a substantial approach or contact of the object occurs, and may be configured using a structure capable of simultaneously forming capacitance and inductance. In one embodiment, the detector 110 may include a coil.

The switching unit 120 may electrically connect the detector 110 and the first detector 130 under the control of the controller 100 in the first sensing mode. The switching unit 120 may be configured to electrically connect the detector 110 and the second detector 140 under the control of the controller 100 in the second sensing mode.

In one embodiment, the first sensing mode may be referred to as proximity mode, capacitive mode, or capacitance mode. In addition, the second sensing mode may be an object determination mode, an inductance mode, or an inductance mode. Or impedance mode.

In the first sensing mode, the first sensing unit 130 may be configured to determine whether the object is in proximity to the object based on a change in capacitance of the detecting unit 110 as the object approaches or contacts the detecting unit 110.

If it is determined that the object is close by the first sensing unit 130, the controller 100 operates the human body sensing device 10 in the second sensing mode. That is, the controller 100 controls the switching unit 120 so that the detection unit 110 and the second detection unit 140 are electrically connected.

In the second sensing mode, the second sensing unit 140 may be configured to determine whether an object in proximity to or in contact with the detecting unit 110 is a human body.

As described above, the human body detecting apparatus 10 according to the present technology uses an element, for example, a coil, in which both inductance and capacitance change according to proximity or contact of an object, as a detector 110.

If it is detected that a change in capacitance occurs by operating the first sensing unit 130 in the first sensing mode, it is determined that an arbitrary object has approached. After that, it is determined whether the approached object is a human body based on the capacitance change amount and the inductance change amount by switching to the second sensing mode.

As described above, in the present technology, the amount of change in inductance can be detected simultaneously with the change in capacitance. Accordingly, it is possible to distinguish between a conductive object and a human body, thereby preventing malfunction in a system that is configured to respond to the human body.

That is, since the capacitance change amount and the inductance change amount will appear differently depending on the characteristics of the object approaching the human body sensing device 10, it is possible to detect whether the approaching object is the human body.

2 is a block diagram of a detector according to an embodiment.

The detection unit 110 of the human body sensing device 10 according to an embodiment of the present technology may have a structure capable of simultaneously forming a capacitance and an inductance. To this end, the detection unit 110 may be configured as a spiral coil. The spiral coil can be made of wire or PCB and can have a two-dimensional or three-dimensional structure.

Figure 2 shows a plan view according to an embodiment of the spiral coil of the two-dimensional form.

3A and 3B are schematic circuit diagrams of a detector according to an embodiment.

In FIG. 3A, parasitic capacitance components present in the two-dimensional spiral coil shown in FIG. 2 are illustrated, and FIG. 3B is an equivalent circuit diagram of FIG. 3A.

As shown in FIGS. 3A and 3B, in the case of the spiral coil, the inductance and the capacitance may be formed at the same time, so that the spiral coil may be adopted as the detection unit 110 of the human body sensing device 10 according to the present technology.

In order to detect changes in capacitance and inductance, a self-oscillator using an LC circuit can be configured to detect a change in oscillation frequency, or a method of detecting a change in amplitude and phase by applying a reference signal having a constant frequency to the LC circuit. There are ways to be used.

The frequency of a self-oscillator using an LC circuit is determined by the values of L and C.

In the oscillator using the LC circuit, the L component is a detector 110 including a spiral coil, and when an object is adjacent to the detector 110 to cause an increase in capacitance or an increase in inductance, the oscillation frequency f ₀ is low. When the inductance is reduced, the oscillation frequency f ₀ is increased.

In general, when an object is a condition that the eddy current is formed adjacent to the human body sensing device 10, the inductance is reduced, if the ferrite-based magnetic material is adjacent to the inductance increases. On the other hand, if there is no decrease in charge due to leakage current, the capacitance increases when an object is adjacent.

Therefore, based on the amount of change in inductance and the amount of change in capacitance, it is possible to detect whether an adjacent object is a conductor or a non-conductor, or has a capacitance component and an inductance component at the same time and to what extent.

As an example, it is assumed that an object having a capacitance is close to the detector 110.

In the case of a conventional capacitive sensor, the proximity of an object will reduce the frequency f ₀ of the oscillator constituting the sensing circuit only by an increase in capacitance (+ ΔC). On the contrary, when an arbitrary object is approached to the human body sensing device 10 proposed in the present technology, the characteristics of the detector 110, the value of the capacitor C constituting the oscillator together with the detector 110, and the degree of conductivity of the object to be approached Accordingly, the capacitance increase (+ ΔC) and the inductance decrease (-ΔL) are different from each other, and accordingly, the amount of change in the oscillation frequency is different. Here, the characteristics of the detector 110 may include a size, inductance value, shape, and the like.

4 is a view for explaining the relationship between the capacitance change amount and the induced capacitance change amount according to the approach of the object.

Referring to FIG. 4, when the inductance decrease (−ΔL) is greater than the capacitance increase (+ ΔC) caused by any object adjacent to the detection unit 110, the oscillation frequency of the oscillator increases (f ₀ + Δf). On the other hand, when the capacitance increase (+ ΔC) is greater than the inductance decrease (-ΔL), the oscillation frequency of the oscillator decreases (f ₀ -Δf).

Therefore, it is apparent that the oscillation frequency f ₀ will be reduced if the object having low conductivity and high dielectric constant such as the human body is adjacent to the detection unit 110.

5 to 8 are configuration diagrams of a human body sensing device according to embodiments. 5 to 8 will be described in more detail with respect to the operation of the human body detecting device 10 for detecting a human body in a hybrid manner.

5 and 6 are exemplary circuits of the human body sensing devices 10-1 and 10-2 using an LC parallel resonator oscillator.

The human body detecting apparatus 10-1 of FIG. 5 is configured to determine whether the human body approaches or not based on the change amount of the oscillation frequency.

Referring to FIG. 5, the switching unit 120 operates a switch in response to the first switch control signal S ₁ , a switch operating in response to the third switch control signal S ₃ , and an inverted third switch control. It may include a switch that operates in response to the signal / S ₃ .

In the first sensing mode, the controller 110 turns on at least one of the switches driven in response to the inverted third switch control signal / S ₃ , and the first switch control signal S ₁ and the third switch control signal. The switch operating in response to S ₃ is turned off so that the detector 110 and the first detector 130 are electrically connected.

That is, the connection between the detector 110 and the second detector 140 is disconnected and the detector 110 is used as the capacitive sensing pad to determine whether the object is close.

The first detector 130 may be configured to detect a change in capacitance according to any object adjacent to the detector 110. In one embodiment, the first sensing unit 130 may be configured to detect the capacitance change amount by measuring the capacitance value according to the proximity of any object.

In the second sensing mode, the third switch control signal (turned on and inverted) is turned on in response to the first switch control signal S ₁ and the third switch control signal S ₃ of the switches of the switching unit 120 ( / S ₃ ) by turning off the switch driven according to the (S ₃ ) to be electrically connected to the detector 110 and the second detector 140.

The second detector 140 may be configured to determine whether or not the human body has approached based on the change in inductance according to the characteristic of the object approaching the detector 110.

In an exemplary embodiment, the second detector 140 may include a frequency measuring unit 141, an inductance measuring unit 143, and a determining unit 145.

The frequency measuring unit 141 may include a capacitor C, an oscillating circuit 1411, and an amplifying circuit 1413, and may be configured to detect an oscillating frequency f ₀ changed according to an inductance change of the detector 110. .

이므로, 유도 용량 측정부(143)는 주파수 측정부(141)에서 측정된 발진 주파수(f₀)와 제 1 감지부(130)에서 검출한 정전용량값에 기초하여 유도용량값을 검출하도록 구성될 수 있다.The oscillation frequency of the resonant circuit is

Therefore, the inductive capacitance measuring unit 143 may be configured to detect the inductive capacitance value based on the oscillation frequency f ₀ measured by the frequency measuring unit 141 and the capacitance value detected by the first sensing unit 130. Can be.

The determination unit 145 may be configured to determine whether an adjacent object is a human body based on the induction capacitance measured by the induction capacitance measurement unit 143 to generate an output signal OUT. In one embodiment, the determination unit 145 may determine whether the human body is in close proximity according to whether the induction capacitance value measured by the induction capacitance measurement unit 143 increases or decreases than the induction capacitance value inherent in the detection unit 110.

However, the increase in capacitance (+ ΔC) and the decrease in inductance (−ΔL) may be the same so that the oscillation frequency f ₀ may not change.

In the LC parallel resonant circuit, even if the capacitance increase (+ ΔC) and inductance decrease (-ΔL) are the same, the impedance due to L and C decreases, so that the output voltage of the oscillation signal decreases. In the LC series resonant circuit, if the capacitance increase (+ ΔC) and the inductance decrease (-ΔL) are the same, the impedance due to L and C decreases, so that the output voltage of the oscillation signal decreases.

Therefore, even when the capacitance increase (+ ΔC) and inductance decrease (−ΔL) are the same and there is no change in the oscillation frequency, the approaching object can be determined based on the characteristics (amplitude and phase) of the oscillation signal.

When the oscillation frequency does not change, the human body detecting apparatus 10-2 of FIG. 6 may determine whether the human body approaches or not based on the magnitude of the oscillation signal.

The human body sensing device 10-2 shown in FIG. 6 has a configuration substantially the same as that of the human body sensing device 10-1 shown in FIG. 5 except for the configuration of the second sensing unit 140-1.

The second detector 140-1 shown in FIG. 6 may include a phase / amplitude detector 147 in addition to the frequency measurer 141, the inductance capacitance measurer 143, and the determiner 145.

The phase / amplitude detector 147 may include a signal source 1471, a switch driven by the path setting switch control signal S ₂ , and an impedance measurer 1473.

In the first sensing mode, the switch driven by the inverted third switch control signal / S ₃ of the switching unit 120 is turned on and the first switch control signal S ₁ and the third switch control signal S _{3 are turned on.} ) And the switch driven according to the path setting switch control signal S ₂ of the phase / amplitude detector 147 is turned off so that the detector 110 and the first detector 130 are turned off. To be electrically connected.

That is, the connection between the detector 110 and the second detector 140 is disconnected and the detector 110 is used as the capacitive sensing pad to determine whether the object is close.

The first detector 130 may be configured to detect a change in capacitance according to any object adjacent to the detector 110. In one embodiment, the first sensing unit 130 may be configured to detect the capacitance change amount by measuring the capacitance value according to the proximity of any object.

When the first sensing unit 130 detects the approach of the object and switches to the second sensing mode, the switch driven by the inverted third switch control signal / S ₃ is turned off. Then, the switch driven in response to the first switch control signal S ₁ and the switch driven in response to the third switch control signal S ₃ are turned on, or the path setting switch of the phase / amplitude detector 147 is turned on. The switch driven according to the control signal S ₂ is turned on so that the detector 110 and the second detector 140 are electrically connected to each other.

In the second sensing mode, when only the switch driven in response to the first switch control signal S ₁ and the switch driven in response to the third switch control signal S ₃ are turned on, the human body sensing device shown in FIG. 5 is turned on. It can operate in the same manner as in (10-1).

In the second sensing mode, the switch driven in accordance with the first switch control signal S ₁ and the switch driven in accordance with the third switch control signal S ₃ are driven in accordance with the routing switch control signal S ₂ . When the switch is turned on, the amplitude and / or phase of the oscillation signal may be measured, and it may be determined whether or not the human body approaches.

For example, when the capacitance increase (+ ΔC) and the inductance decrease (-ΔL) are the same and there is no change in the oscillation frequency, the phase / amplitude detector 147 is operated to generate a fixed frequency of a constant magnitude from the signal source 1471. The signal having the signal is applied, and at this time, the amplitude Av and / or the phase Ф o can be detected through the impedance measuring unit 1473.

In addition, the determination unit 145 may determine whether the human body approaches or not based on the amplitude and / or the phase value.

7 and 8 are exemplary circuits of the human body sensing devices 10-3 and 10-4 using a pi (π) type LC resonator oscillator.

The human body sensing device 10-3 shown in FIG. 7 is a human body sensing device shown in FIG. 5 except that the coil constituting the detector 110 configures a piezoelectric oscillator together with the capacitors C1 and C2. It is substantially the same as (10-1).

The human body sensing device 10-4 shown in FIG. 8 is a human body sensing device shown in FIG. 6 except that the coil constituting the detector 110 forms a piezoelectric oscillator together with the capacitors C1 and C2. It is substantially the same as (10-2).

9A and 9B are diagrams for describing a sensing method in a first sensing mode.

The human body detecting apparatuses 10, 10-1, 10-2, 10-3, and 10-4 shown in FIGS. 5 to 8 move the detector 110 in the first sensing mode together with the sensing pad of the capacitive sensor apparatus. Capacitance can be detected by setting.

In an embodiment, as shown in FIG. 9A, both ends of the detection unit 110 are shorted by shorting the first and second switches SW1 and SW2 that operate in response to the inverted third switch control signal / S ₃ . May be connected to the first sensing unit 130 (a). Fig. 9A (b) is a conceptual diagram of (a) and (c) shows an equivalent circuit diagram. That is, the capacitance change of the detector 110 may be detected in a state in which both ends of the detector 110 are connected to the first detector 130.

In an embodiment, as shown in FIG. 9B, only one terminal of the detector 110 may be connected to the first detector 130 to detect a change in capacitance of the detector 110.

As shown in (a) of FIG. 9B, any one of the switches SW1 and SW2 connecting the detection unit 110 and the first sensing unit 130, for example, the first switch SW1 is shorted and The two switches SW2 may detect the capacitance in the open state. 9b (b) is a conceptual diagram of (a) and (c) shows an equivalent circuit diagram.

As such, in the first sensing mode, the switching unit 120 may be controlled to convert the human body sensing device 10 into a capacitive sensor. In this state, when a change in capacitance is detected, it is determined that an object has approached, and the switching unit 120 is controlled to switch to the second sensing mode to distinguish the approached object. In the second sensing mode, the frequency and / or magnitude and / or phase representing the characteristic impedance of the object are sensed to determine whether the approached object is the sensing object.

10 is a configuration diagram of a detector according to embodiments.

It is effective to determine the size of the detector 110, which may be composed of a helical coil, to be proportional to the size of the sensing object, and the larger the size of the detector 110 is, the larger the change in frequency depending on the type of the adjacent object is. to be.

In addition, if the inductance value of the detector 110 is increased based on a constant oscillation frequency, the parasitic capacitance is increased in proportion to this, and the C value constituting the resonant circuit is set small while the inductance value of the detector 110 is decreased. The smaller the parasitic capacitance, the smaller the C value constituting the resonant circuit.

If the inductance value is large, the magnetic field is strongly formed, and in this case, the magnetic field is relatively sensitive to a conductive object having a strong eddy current such as a metal plate rather than a relatively large dielectric constant such as silicon or a human body.

When the inductance value is small, the magnetic field is weakly formed, and as the object having high conductivity approaches, the decrease in inductance becomes the main factor to change the oscillation frequency up to a certain distance, and the increase in capacitance changes the oscillation frequency when the inductance value is approached beyond a certain distance. It will act as a factor.

Therefore, when the proximity object is an object with high conductivity, the frequency of the detector 110 becomes higher as the object approaches, while the frequency becomes higher as the object approaches, while the value of inductance of the detector 110 becomes smaller until the object approaches a certain distance. When the oscillation frequency increases and approaches beyond a certain point, the oscillation frequency decreases due to the increase in capacitance rather than the decrease rate of inductance.

On the other hand, even if the inductance value of the detector 110 is the same, the detection range may be different depending on the shape. For example, a two-dimensional spiral coil implemented on a plane and a three-dimensional spiral coil implemented in three dimensions may be compared as an example. The two-dimensional spiral coil has a large sensing area but a short sensing distance, and the three-dimensional spiral coil has a small sensing area, but the magnetic flux density is concentrated, so the sensing distance can be long.

In addition, when the distance between the conductors constituting the coil, which is the detection unit 110, becomes wider, the parasitic capacitance may be reduced, thereby reacting sensitively to the capacitance change.

Therefore, if the size, shape, inductance value of the detector 110 and the C value of the oscillation circuit are adjusted to match the characteristics (size, shape, material, etc.) of the object to be detected, it can be applied to various fields.

As illustrated in FIG. 10, various objects as well as the human body may be detected using the principle of the human body detecting apparatus 10 according to the present technology, and an inductance value may be appropriately set according to the type of the object to be detected.

Referring to FIG. 10, a two-dimensional spiral coil may be applied as a sensing unit for a touch switch (a), a large area level sensor (c), and a large area object detection (e) in response to human body contact.

In another embodiment, the touch switch in response to human body contact may use a spring coil (b) or a tensioned conical coil (g) or a tensioned cylindrical coil (h). Three-dimensional spiral coils can be used for remote water level sensing (d) and foreign matter sensing (f) inside the vessel.

11 is a flowchart illustrating a human body detecting method according to an exemplary embodiment.

A human body detecting method using the human body detecting apparatuses 10, 10-1, 10-2, 10-3, and 10-4 illustrated in FIGS. 1 and 5 to 8 will be described with reference to FIG. 11.

The human body sensing apparatuses 10, 10-1, 10-2, 10-3, and 10-4 may initially operate in a first sensing mode (S101).

In the first sensing mode, the detector 110 maintains a connection with the first detector 130 and is not connected to the second detector 140. Therefore, the detection unit 110 acts as a sensing pad of the capacitive sensor.

In the first sensing mode, the first sensing unit 130 determines whether any object is close according to whether the capacitance is changed (S103).

If it is determined in step S103 that an object is approached (S103-Y), the human body sensing devices 10, 10-1, 10-2, 10-3, and 10-4 may switch to the second sensing mode. It may be (S105). If any object does not approach (S103-N), the first sensing mode is maintained (S101).

When any object approaches and enters the second sensing mode, the second sensing unit 140 determines the frequency from the oscillation signal output from the resonance circuit formed by the detecting unit 110 to determine what is approached (S107). Detect. In the case of the human body sensing devices 10-2 and 10-4 including the phase / amplitude detection unit 147, it is also possible to detect the amplitude and / or the phase in addition to the frequency.

Then, it is determined whether the object of access is the human body based on the value detected in step S107 (S109). If the human body (S109-Y) maintains the second detection mode (S111), if not the human body (S109-N) can be switched to the first detection mode (S101).

In one embodiment, if the first sensing unit 130 of the human body sensing device 10, 10-1, 10-2, 10-3, 10-4 is determined that any object is approached in step S103 accordingly Capacitance value can be detected.

In operation S107, the second detector 140 may calculate an inductance value based on the frequency measurement value of the oscillation circuit and the capacitance value detected by the first detector 130. In addition, in step S109 it may be determined whether or not the human body approaches, based on the inductance value calculated in step S107.

If it is determined that an arbitrary object is close but there is no change in the oscillation frequency, the amplitude and / or phase of the oscillation signal may be measured in step S107, and in step S109, it may be determined whether the human body approaches based on the amplitude and phase. can do.

In the above description, the human body sensing method of detecting a change in capacitance in the first sensing mode and determining the type of the approached object based on the impedance change according to the change in inductance in the second sensing mode has been described, but the present invention is not limited thereto. Do not.

For example, in the first sensing mode, a change in inductance may be sensed to determine whether an object has approached. In an embodiment, the oscillation frequency of the oscillation signal according to the change in inductance in the first sensing mode may be measured. If it is determined that an object has approached, the device switches to the second sensing mode and detects capacitance according to the characteristics of the approached object. The inductance value may be extracted according to the oscillation frequency measured in the first sensing mode and the capacitance value measured in the second sensing mode to determine the type of the transferred object.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

10, 10-1, 10-2, 10-3, 10-4: human body sensing device
110: detector
120: switching unit
130: first detection unit
140: second detection unit

Claims (6)

A detector configured of only a coil to simultaneously form capacitance and inductance;
A first sensing unit electrically connected to the detecting unit in a first sensing mode to detect whether an object is approached based on an amount of change in capacitance;
The resonance circuit includes the capacitance measured by the first sensing unit and is electrically connected to the detecting unit in a second sensing mode when the first sensing unit detects that an object is approached. A second detector configured to detect a frequency change from the oscillation signal of and to determine the type of the approached object; And
In the first sensing mode, the detection unit and the first sensing unit are electrically connected to each other, and the detection unit and the second sensing unit are disconnected. And a switching unit configured to electrically connect the detection unit and the second detection unit and to cut off the connection of the detection unit and the first detection unit when switching to the mode.
The second detector may increase the oscillation frequency when the inductance decrease is greater than the increase in capacitance due to an arbitrary object approaching the detector, and decrease the oscillation frequency when the increase in capacitance is greater than the inductance decrease. Human body sensing device. The method of claim 1,
The detecting unit is a human body sensing device consisting of a spiral coil. The method of claim 1,
And the second detector is configured to detect amplitude and / or phase from the oscillation signal of the resonant circuit. A human body detecting method of a human body detecting device including a detector, a first detector, a second detector, and a switching unit configured only with a coil capable of simultaneously forming capacitance and inductance,
The switching unit electrically connecting the detection unit and the first detection unit and disconnecting the detection unit from the second detection unit to set the first detection mode;
Detecting, by the first sensing unit, whether an object approaches the detection unit based on the capacitance change amount of the detection unit in the first detection mode;
Switching off the detection unit from the second detection unit and electrically connecting the detection unit with the first detection unit to switch to the second detection mode when it is detected that an object is approached in the first detection mode. ;
Detecting a frequency change from an oscillation signal of a resonant circuit including the detector by the second detector in the second detection mode; And
Determining the type of the approached object based on the frequency change;
Detecting the frequency change,
The oscillation frequency is increased when the inductance decrease is greater than the capacitance increase due to the arbitrary object approaching the detector, and the oscillation frequency is detected by decreasing the oscillation frequency when the capacitance increase is greater than the inductance decrease. Human detection method comprising. The method of claim 4, wherein
The detecting unit is a human body sensing method consisting of a spiral coil. The method of claim 4, wherein
The determining of the type of the approached object further comprises detecting an amplitude and / or a phase from the oscillation signal.

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