CN211151942U

CN211151942U - Anti-interference long-distance capacitance sensing module

Info

Publication number: CN211151942U
Application number: CN202020093555.6U
Authority: CN
Inventors: 周文辉; 张海; 廖送邦; 杨灿坚
Original assignee: Zhongshan Anbo Health Technology Co ltd
Current assignee: Zhongshan Anbo Health Technology Co ltd; Zhongshan Meitu Plastic Industry Co Ltd
Priority date: 2020-01-16
Filing date: 2020-01-16
Publication date: 2020-07-31
Anticipated expiration: 2030-01-16

Abstract

The utility model provides an anti-interference long distance electric capacity response module, include the plastics box body that comprises lid and box body, its characterized in that: the plastic box body is internally provided with a circuit board and an induction electrode, the circuit board is connected with an output line, the induction electrode is right opposite to the box cover, a shielding cover is arranged on the outer side of the box body, the shielding cover at least covers the bottom surface of the box body, and the shielding cover is grounded through the circuit board. The utility model increases the induction distance by the sheet electrode, the larger the area is, the farther the induction distance is, and meanwhile, in order to make up for the defect of the reduced anti-interference performance caused by the reduction of the area, the shielding box is arranged outside the box body, and all interference directions are shielded, and only the induction surface just opposite to the induction electrode is reserved; the touch IC calculates and processes the change of the distributed capacitance, reduces the loss of hardware, thereby reducing the power consumption, realizing low power consumption of about 10 microamperes and being used as a battery product with low requirement on the power consumption.

Description

Anti-interference long-distance capacitance sensing module

Technical Field

The utility model relates to an anti-interference remote electric capacity response technique, concretely relates to anti-interference long distance electric capacity response module.

Background

At present, the induction distance of a capacitor on the market is short, generally within a 3mm distance, and after the distance is increased, serious interference exists, the capacitor change of the surrounding environment can easily cause misoperation, and the anti-interference capability is poor. Therefore, the application of human or object proximity sensing is mostly to use an infrared sensing method to obtain a relatively reasonable sensing distance, but the power consumption of infrared sensing is relatively large, the current is at least more than 50 microamperes, and it is impossible to distinguish human (or animal) from object proximity.

SUMMERY OF THE UTILITY MODEL

For overcoming the problem that exists among the prior art, the utility model aims at realizing low-power consumption, long distance electric capacity response module, its concrete technical content as follows:

the utility model provides an anti-interference long distance electric capacity response module, its box body that includes the lid of metal material and plastics material, in be equipped with response electrode and circuit board in the box body, the response electrode is just to the bottom surface of box body, the circuit board is connected with the output line, lid and box body looks lock are in order to form the shield cover of wrapping up in the opening of box body or/and lateral wall, and the lid carries out ground connection through wire connecting circuit board.

In one or more embodiments of the present invention, the sensing electrode is a sheet electrode.

In one or more embodiments of the present invention, the sensing electrode is a printed circuit board or a metal sheet.

In one or more embodiments of the present invention, the circuit board includes a touch IC, which has a sensing electrode input end for connecting the sensing electrode, a touch signal output end for outputting a touch signal, and a sensing signal output end for outputting a sensing signal, wherein the sensing electrode is connected to the sensing electrode input end through a current limiting resistor R1 and grounded through a filter capacitor C5.

In one or more embodiments of the present invention, a self-tapping screw seat is provided in the box body, a hole opposite to the self-tapping screw seat is provided in the box cover, and the box cover and the box body are connected by a self-tapping screw lock; the side wall of the box body or/and the box cover is/are provided with wire holes for the output wires to penetrate out.

The utility model has the advantages that: the induction distance is increased by the sheet-shaped electrode, the area is large, the induction distance is large, and meanwhile, in order to make up for the defect of reduced anti-interference performance caused by the reduction of the induction distance, the box body is provided with the shielding cover, so that all interference directions are shielded, and only the induction surface opposite to the induction electrode is reserved; the touch IC calculates and processes the change of the distributed capacitance, reduces the loss of hardware, thereby reducing the power consumption, realizing low power consumption of about 10 microamperes and being used as a battery product with low requirement on the power consumption.

Drawings

Fig. 1 is a schematic diagram of the explosion structure of the present invention.

Fig. 2 is a schematic sectional view of the box body of the present invention.

Fig. 3 is a schematic circuit diagram of the present invention.

Detailed Description

The scheme of the present application is further described below with reference to the accompanying drawings 1 to 3:

the utility model provides an anti-interference long distance electric capacity response module, includes the box body that comprises lid 1 and box body 2, and lid 1 is made by metal materials such as aluminium-iron, and box body 2 is the plastics material, in be equipped with response electrode 4 and circuit board 3 in the box body, response electrode 4 is just to the bottom surface of box body 2, and this bottom surface is the response face, circuit board 3 is connected with output line 5 (has the plug), lid 1 and 2 looks locks of box body surround the shielded enclosure of the opening of box body 2 and lateral wall in order to form, and it carries out ground connection through wire connecting circuit board 3. In the area covered by the shielding cover (box cover 1), the external interference signal will be reflected (as shown by arrow B in fig. 2), and only the sensing surface is left to allow the signal to pass through (as shown by arrow a in fig. 2).

The box body 2 is provided with a self-tapping screw seat 21, the box cover 1 is provided with an opening 11 opposite to the self-tapping screw seat 21, and the box cover 1 and the box body 2 are fixedly connected through a self-tapping screw 6; the side walls of the box cover 1 and the box body 2 are respectively provided with a wire hole 12 and a wire hole 22 for the output wire 5 to penetrate through, so that the disassembly and the assembly are convenient.

The induction electrode 4 is a sheet electrode, can be a printed circuit board or a metal sheet such as aluminum, iron, copper and the like, and has an electrode sheet with a diameter of about 60mm when the induction distance is about 100 mm.

The circuit board 3 includes a touch IC (shown as U1 in fig. 3) of type IQS127D, the touch IC has a sensing electrode input end CX, a touch signal output end TOUT and a sensing signal output end POUT, the sensing electrode 4 is connected to the sensing electrode input end CX through a current limiting resistor R1, and is grounded through a filter capacitor C5. The touch IC calculates and processes the change of the distributed capacitance, reduces the loss of hardware, thereby reducing the power consumption, realizing low power consumption of about 10 microamperes and being used as a battery product with low requirement on the power consumption.

The principle of capacitance induction:

the human body can be regarded as a conductor, and a plurality of charges which can move freely are distributed on the conductor, and when the human body is acted by an electric field, the charges can move, negative charges move in the direction opposite to the direction of the electric field, and positive charges move in the direction along the direction of the electric field. When the human body does not contact or approach the sensing electrode externally connected with the touch IC, the touch IC only carries out charging and discharging work by the distributed capacitance of the sensing electrode. When a human body contacts or approaches to the induction electrode of the touch IC, the electric field effect generated by the positive charges of the distributed capacitance of the induction electrode is used, the negative charges of the human body are attracted to the induction electrode accessory, so that the distributed capacitance between the human body and the induction electrode is formed, and the capacitance found in the touch IC detection is the accumulation of the distributed capacitance of the induction electrode and the distributed capacitance of the human body, which is equivalent to the fact that the whole capacitance is increased. When the touch IC detects that the distributed capacitance is increased to more than 2 percent of the original distributed capacitance, whether a human body approaches or touches or not is calculated through an algorithm, and therefore a fixed high or low level signal is output.

The above preferred embodiments should be considered as examples of the embodiments of the present application, and technical deductions, substitutions, improvements and the like similar to, similar to or based on the embodiments of the present application should be considered as the protection scope of the present patent.

Claims

1. An anti-interference long distance capacitance sensing module which characterized in that: including the lid of metal material and the box body of plastics material, in be equipped with response electrode and circuit board in the box body, the response electrode is just to the bottom surface of box body, the circuit board is connected with the output line, lid and box body looks lock are in order to form the shield cover of parcel in the opening of box body or/and lateral wall, and the lid carries out ground connection through wire connecting circuit board.

2. The tamper-resistant long-range capacitive sensing module of claim 1, wherein: the induction electrode is a sheet electrode.

3. The tamper-resistant long-range capacitive sensing module of claim 1, wherein: the induction electrode is a printed circuit board or a metal sheet.

4. The tamper-resistant long-range capacitive sensing module of claim 1, wherein: the circuit board comprises a touch IC, wherein the touch IC is provided with a sensing electrode input end used for being connected with a sensing electrode, a touch signal output end used for outputting a touch signal and a sensing signal output end used for outputting a sensing signal, the sensing electrode is connected to the sensing electrode input end through a current limiting resistor R1 and is grounded through a filter capacitor C5.

5. The tamper-resistant long-range capacitive sensing module of any one of claims 1 to 4, wherein: a self-tapping screw seat is arranged in the box body, an opening opposite to the self-tapping screw seat is formed in the box cover, and the box cover is fixedly connected with the box body through the self-tapping screw; the side wall of the box body or/and the box cover is/are provided with wire holes for the output wires to penetrate out.