CN215734212U

CN215734212U - Human body infrared contactless switch

Info

Publication number: CN215734212U
Application number: CN202121230626.3U
Authority: CN
Inventors: 张彩霞
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-02
Filing date: 2021-06-02
Publication date: 2022-02-01
Anticipated expiration: 2031-06-02

Abstract

The invention discloses a human body infrared contactless switch which comprises a contactless switch body, wherein the contactless switch comprises an induction substrate and a signal unit which are detachably connected, a coil is arranged on the induction substrate, a control circuit board is arranged in the signal unit, a voltage comparator, a triode, a plurality of induction resistors and a power supply are arranged on the control circuit board, a light emitting diode is arranged on the outer side of the induction substrate, and one end of the coil is electrically connected with the triode. In the invention, metal with a certain area is laid on a PCB as an induction substrate and is connected to the B pole of a triode. When a human body approaches, the basic charge will change slightly, which may cause a triode reaction, which is converted to a small change in voltage, giving a recognizable signal. A practical level circuit can be obtained through subsequent voltage processing, and the practical level circuit can be used for controlling and driving equipment and devices to realize a perfect switching function.

Description

Human body infrared contactless switch

Technical Field

The invention relates to the field of switches, in particular to a human body infrared contactless switch.

Background

With the progress of science and technology, energy-saving, comfortable, safe and convenient home life becomes the pursuit of more and more people. In recent years, new products using induction control have been continuously introduced, in which electronic switches controlled by human body induction are increasingly widely used.

The existing electronic switches controlled by human body induction mainly adopt the technologies of infrared induction, radar induction and the like. The electronic switch does not need to be operated manually, and controls a specific object by sensing the approaching or activity information of a human body, thereby bringing great convenience to people.

However, as it is found in use, the infrared induction type switch cannot be used in a light-tight closed environment. As for the radar principle class switch, it is sensitive only to moving objects! And the radar type inductive switch needs to have a certain distance, such as within a range of several meters. This type of radar switch cannot be applied to the following cases: when the sensing distance is within 5cm, the human body and the switch do not move relatively! Especially in small installations, e.g. 3mm thick, and under sealing requirements, e.g. water-entry working conditions. The existing non-contact switch can not be smoothly realized by either a switch based on an infrared induction principle or a switch based on a radar principle.

To overcome the defects of the existing non-contact switch, a human body infrared non-contact switch has come into force!

Disclosure of Invention

The invention aims to solve the technical problems that an electronic switch in the prior art is not sensitive to control in a sealed state and the like.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: the utility model provides a human infrared contactless switch, includes the contactless switch body, contactless switch is including dismantling the induction base plate and the signal unit of connection, be provided with the coil on the induction base plate, be provided with control circuit board in the signal unit, last voltage comparator, triode, a plurality of induction resistance and the power supply of being provided with of control circuit board, the outside of induction base plate is provided with emitting diode, electric connection between the one end of coil and the triode.

Furthermore, the emitting electrode of the triode is used for being connected with a grounding wire, the induction resistor comprises a first resistor, a third resistor and a fourth resistor, two ends of the first resistor are respectively electrically connected with the power supply and the collector electrode of the triode, one end of the fourth resistor is used for being electrically connected with the power supply, and the other end of the fourth resistor is used for being connected with the fourth resistor.

Furthermore, the voltage comparator adopts an AMP chip, a pin 5 of the voltage comparator is connected with a ground line through a fourth resistor, and a Vo port is arranged outside a pin 14 of the voltage comparator and is electrically connected with the light emitting diode.

Further, the power supply adopts a 3V button battery for power supply.

Further, the resistance value of the first resistor is 100K-1M, the resistance value of the third resistor is 1M-2M, and the resistance value of the fourth resistor is 100K-1M.

Furthermore, the base electrode of the triode is electrically connected with one end of the coil.

Furthermore, an induction capacitor is connected between the collector electrode and the emitter electrode of the triode.

In the invention, metal with a certain area is laid on a PCB as an induction substrate and is connected to the B pole of a triode. When a human body approaches, the basic charge will change slightly, which will cause a triode reaction, which is converted into a small change in voltage, giving a recognizable signal! After subsequent voltage processing, a practical level circuit can be obtained, which can be used to control and drive equipment and devices, and realize perfect switching function!

The key points of the human body non-contact switch technology are as follows: a processing scheme of an induction unit consisting of an induction substrate, an electric group and a triode, and subsequent voltage processing. The sensing unit can obtain a stable voltage signal through reasonable processing. The subsequent voltage is reasonably processed, and different induction distances can be obtained according to different requirements.

Compared with the prior art, the invention has the advantages that: the human body infrared contactless switch effectively solves the problems of insensitive control and the like in a closed state in the prior art, and has the following advantages:

1. the structure is simple, the elements are few, and the volume can be small.

2. The induction range and sensitivity of the switch can be adjusted according to the need to change the size of the coil, and the size of Vt and vref can be changed by changing the negative of the resistor)

3. When the parameters are matched, the error action is basically avoided.

The non-contact stable induction of a short distance such as 5cn can be realized; the principle is simple, few devices can be used, and the device can have a small volume so as to adapt to the special space requirement of the space; since non-contact induction can be realized, the device can be used in an environment needing sealing.

When contactless induction is needed, the range can not exceed 10cm, the installation space is limited, and the human body infrared contactless switch is an irreplaceable switch scheme under the condition of sealed use!

Drawings

FIG. 1 is a structure diagram of a PCBA front induction substrate of a human body infrared contactless switch of the present invention;

FIG. 2 is a layout diagram of a PCBA reverse side device of the human body infrared contactless switch of the present invention;

FIG. 3 is a diagram of the internal control circuitry of the present application;

FIG. 4 is an application connection diagram of Vo terminal.

As shown in the figure: 1. the LED driving circuit comprises a sensing substrate, 2, a light emitting diode, 3, a sensing capacitor, 4, a triode, 5, a sensing resistor, 6,

reference voltage resistors

1 and 7, reference voltage resistors 2 and 8 and a voltage comparator.

Wherein, 1, 3, 4 and 5 jointly form an induction unit; reference voltages are formed by 6 and 7; 8, comparing the signal voltage with the reference voltage, and outputting a high level or a low level of a comparison result; v + and GND are positive and negative bonding pads of button cell

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

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

The invention provides a human body infrared contactless switch which comprises a contactless switch body, wherein the contactless switch comprises an induction substrate 1 and a signal unit which are detachably connected, a coil is arranged on the induction substrate 1, a control circuit board is arranged in the signal unit, a voltage comparator 8, a triode 4, a plurality of induction resistors 5 and a power supply are arranged on the control circuit board, a light-emitting diode 2 is arranged on the outer side of the induction substrate 1, and one end of the coil is electrically connected with the triode 4.

The emitting electrode of the triode 4 is used for being connected with a grounding wire, the induction resistor 5 comprises a first resistor, a third resistor and a fourth resistor, two ends of the first resistor are respectively electrically connected with the power supply and the collector electrode of the triode 4, one end of the fourth resistor is used for being electrically connected with the power supply, and the other end of the fourth resistor is used for being connected with the fourth resistor. The voltage comparator 8 adopts an AMP chip, a pin 5 of the voltage comparator 8 is connected with a ground wire through a fourth resistor, and a Vo port is arranged on the outer side of a pin 14 of the voltage comparator 8 and is electrically connected with the light emitting diode 2. The power supply is powered by a 3V button battery. The resistance value of the first resistor is 100K-1M, the resistance value of the third resistor is 1M-2M, and the resistance value of the fourth resistor is 100K-1M. And the base electrode of the triode 4 is electrically connected with one end of the coil. And an induction capacitor 3 is connected between the collector and the emitter of the triode 4. The signal unit comprises a signal sensing unit and a signal voltage processing unit.

The specific working principle and the implementation mode of the invention are as follows:

the principle is that a coil with a certain width is connected to the B pole of the three-pole tube, and when a human body approaches, the electric quantity on the coil is changed, so that the triode is conducted. The voltage at the Vt point changes from high to low, the voltage at the Vt point changes from greater to less than the voltage at the vref point, and the output voltage at the output terminal vo of the comparator changes from the on to high.

Second, its specific implementation mode is as follows;

1. when a light emitting diode is connected to the Vo terminal, the LED will emit light when a human hand approaches.

2. When the Vo is connected with the infrared switch, the infrared switch can be in an open conducting state when the human hand approaches).

3. When the triode is connected to Vo end, the triode is conducted when human hand approaches

As a further elaboration of the invention, the real object of the invention can be used to seal the bottom of a red wine glass, the LED is not on at ordinary times, the LED is on when the glass body is held by a hand, and the LED is off when the hand is put down and leaves the glass body.

One specific application is as follows;

according to this switching principle, a light-emitting diode is connected to Vo. The cup lower part of the red sprinkling cup which can be arranged at the position with the maximum height less than 3mm is made, and the common red sprinkling cup is changed into a luminous cup which can emit light according to the preference of the user. The following functions can be realized:

1. when the cup is taken up by a hand, the LED emits light, and the LED does not emit light at any time.

2. The sprinkling cup can be put into a dishwasher for washing.

3. Rechargeable battery

4. The dark current is not more than 30 μ A.

Firstly, the principle has simple structure, and can be made very small and thin. (0.3 PCB can be used, the induction substrate can be realized by copper coating on one side of double-sided PCB, LED can be 0805 or 0603 high brightness LED placed on the center of the front side of PCB (just the most concave part of the bottom of red wine glass can fully utilize a space, the part of PCB can be divided into the edges of the board as much as possible on the device side, so that the position of button battery can be left on the middle, the battery can be 2016 or 1612 rechargeable battery, the lowest side, namely the position with the largest diameter of the bottom of red wine glass can be provided with a wireless charging receiving board, the receiving board is also 0.3mm double-layer PCB, the outer edge of the board is etched to form a receiving coil, the middle part is provided with a battery hole, the original piece is received by the cloth around the hole, so that the total height is 1.6+0.3+0.6 ═ 25mm (the thickness of the middle battery is calculated according to the battery), 0.3 is the thickness of the switch board, and 0.6 is the space of LED)

Secondly, the method comprises the following steps: the switch of this principle fully meets the performance requirements: only when the hand touches the sprinkling cup, the switch can sense the situation, and the adverse effect that the person sits beside the sprinkling cup to react is avoided.

Through the analysis of the general structure of the sample plate in the upper section, the sleeve plate can be completely encapsulated to the bottom of a red wine glass without influencing the use and cleaning

Most importantly, the PCBA debugged according to the principle has stable performance, and the switch does not have a response within 5cm of being not close to the switch by a human body. Can completely meet the following requirements: when the cup is taken up by a hand, the LED emits light, and the LED does not emit light at any time.

The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A human infrared contactless switch is characterized in that: the non-contact switch comprises a non-contact switch body, the non-contact switch comprises a sensing substrate (1) and a signal unit, wherein the sensing substrate (1) and the signal unit are detachably connected, a coil is arranged on the sensing substrate (1), a control circuit board is arranged in the signal unit, a voltage comparator (8), a triode (4), a plurality of induction resistors (5) and a power supply are arranged on the control circuit board, a light-emitting diode (2) is arranged on the outer side of the sensing substrate (1), and one end of the coil is electrically connected with the triode (4).

2. The human body infrared contactless switch of claim 1, characterized in that: the emitting electrode of the triode (4) is used for being connected with a grounding wire, the induction resistor (5) comprises a first resistor, a third resistor and a fourth resistor, two ends of the first resistor are respectively electrically connected with the power supply and the collecting electrode of the triode (4), one end of the fourth resistor is used for being electrically connected with the power supply, and the other end of the fourth resistor is used for being connected with the fourth resistor.

3. The human body infrared contactless switch of claim 1, characterized in that: the voltage comparator (8) adopts an AMP chip, a pin 5 of the voltage comparator (8) is connected with a grounding wire through a fourth resistor, and a Vo port is arranged on the outer side of a pin 14 of the voltage comparator (8) and is electrically connected with the light emitting diode (2).

4. The human body infrared contactless switch of claim 1, characterized in that: the power supply is powered by a 3V button battery.

5. The human body infrared contactless switch of claim 2, characterized in that: the resistance value of the first resistor is 100K-1M, the resistance value of the third resistor is 1M-2M, and the resistance value of the fourth resistor is 100K-1M.

6. The human body infrared contactless switch of claim 1, characterized in that: and the base electrode of the triode (4) is electrically connected with one end of the coil.

7. The human body infrared contactless switch of claim 1, characterized in that: and an induction capacitor (3) is connected between the collector electrode and the emitter electrode of the triode (4).

8. The human body infrared contactless switch of claim 1, characterized in that: the signal unit comprises a signal sensing unit and a signal voltage processing unit.