CN102801410A

CN102801410A - Normally-opened type electronic microswitch

Info

Publication number: CN102801410A
Application number: CN2012102893420A
Authority: CN
Inventors: 刘昭利
Original assignee: 刘昭利
Current assignee: Guangdong Hushun Electrical Appliance Co., Ltd.
Priority date: 2012-08-15
Filing date: 2012-08-15
Publication date: 2012-11-28
Anticipated expiration: 2032-08-15
Also published as: CN102801410B

Abstract

The invention discloses a normally-opened type electronic microswitch, which comprises a 9V DC power supply, a touch electrode, an astable trigger circuit and an electric level output terminal. The normally-opened type electronic microswitch is characterized in that the model of a quad 2-input NAND (NOT-AND) gate circuit is CD4011. According to the embodiment, only two NAND circuits are used. The normally-opened type electronic microswitch disclosed by the invention has the advantage of no abrasion of mechanical parts, is particularly used in a humid, powdered or dusty environment which is not suitable for a common mechanical microswitch, and the mechanical microswitch is also not easy to be combined with an instrument and an automatic control circuit. The normally-opened type electronic microswitch disclosed by the invention is a circuit replacing the mechanical microswitch, overcomes the defects of the mechanical microswitch, can control a working state of the circuit by touching the touch electrode on the circuit with a finger, and has an accurate delaying role that the common mechanical microswitch cannot replace; and the electric level output end of the normally-opened type electronic microswitch can directly drive optical, electric or SCR (silicon-controller rectifier) control circuits.

Description

Electronic microswitch open in usual

Technical field

The invention belongs to electronics and automatic control technology field, is about a kind of electronic microswitch open in usual.

Background technology

Electronic microswitch open in usual of the present invention has the wearing and tearing of no mechanical parts, especially unaccommodated local use of standard machinery sensitive switch, as: the more environment of humidity or dust or dust uses down.The mechanical type sensitive switch is difficult for using with instrument and the combination of automation control circuit.Electronic microswitch electricity consumption submode open in usual of the present invention replaces a kind of circuit of the mechanical moving switch that declines; Overcome the defective that the mechanical type sensitive switch exists; The operating state of utilizing finger to touch the touch electrode control circuit on the circuit, and its accurate delay effect is that the inconvenience of standard machinery sensitive switch substitutes.The used core parts of this electronic microswitch open in usual are two inputs, four NAND gate circuits (CD4011), and its level output end can directly drive control circuits such as light, electricity, controllable silicon.

Below specify electronic microswitch open in usual of the present invention related relevant technologies content in implementation process.

Summary of the invention

Goal of the invention and beneficial effect: electronic microswitch open in usual of the present invention has the wearing and tearing of no mechanical parts, especially unaccommodated local use of standard machinery switch, as: the more environment of humidity or dust or dust uses down.The mechanical type sensitive switch is difficult for using with instrument and the combination of automation control circuit.Electronic microswitch open in usual of the present invention utilizes the electronics mode to replace decline a kind of circuit of moving switch of machinery; Use; Overcome the defective that the mechanical type sensitive switch exists; It is the operating state of touching the touch electrode control circuit on the circuit with finger, and its accurate delay effect is that the inconvenience of standard machinery sensitive switch substitutes.The used core parts of this electronic microswitch open in usual are two inputs, four NAND gate circuits (CD4011), and its level output end can directly drive control circuits such as light, electricity, controllable silicon.

The circuit working principle: process touch electrode CM with sheet metal, when finger did not touch touch electrode MC, the astable multibrator circuit was not worked; When finger touches touch electrode CM simultaneously, be equivalent to insert an equivalent resistance, resistance is generally less than 0.6M Ω, and the astable multibrator circuit is just started working;

The model of two inputs, four NAND gate circuit IC1 is CD4011, and circuit is connected into the trigger that has or not steady state function, the anodal VCC of the 14th pin connection circuit of two inputs, four NAND gate circuit IC1; The 7th pin connection circuit ground GND of two inputs, four NAND gate circuit IC1; When touching on the circuit touch electrode CM sheet metal with hand; The 1st pin of two inputs, four NAND gate circuit IC1 is a high level; The 4th pin of two inputs, four NAND gate circuit IC1 becomes low level, and the 5th pin, the 6th pin of delivering to two inputs, four NAND gate circuit IC1 make the 3rd pin output high level of two inputs, four NAND gate circuit IC1 after anti-phase; But this high level driving transistors, or logical circuit etc.Output the 3rd pin of two inputs, four NAND gate collector IC1 becomes high level and kept for 1～12 second approximately; Electrochemical capacitor C1 capacity in the adjustment astable multibrator circuit can change the width of level output, that is: the 3rd pin of two inputs, four NAND gate circuit IC1 output high level holds time.

Technical scheme: electronic microswitch open in usual, it comprises 9V DC power supply, touch electrode CM, astable multibrator circuit and level output end, it is characterized in that:

Astable multibrator circuit: form by two inputs, four NAND gate circuit IC1, touch electrode CM, resistance R 1, electrochemical capacitor C1, resistance R 2 and resistance R 3; The model that two inputs, four NAND gate circuit IC1 select for use is CD4011; The end of the 1st pin connecting resistance R2 of two inputs, four NAND gate circuit IC1 and an end of resistance R 3; The end of electrode CM is touched in the other end contact of resistance R 2; The anodal VCC of the 14th pin of two inputs, four NAND gate circuit IC1 and the other end connection circuit of resistance R 3; The 2nd pin of two inputs, four NAND gate circuit IC1 connects the 4th pin of two inputs, four NAND gate circuit IC1; The 5th pin of two inputs, four NAND gate circuit IC1 links to each other with the negative pole of electrochemical capacitor C1 and an end of resistance R 1 with the 6th pin, the other end connection circuit ground GND of the other end of resistance R 1 and touch electrode CM, and the 3rd pin of two inputs, four NAND gate circuit IC1 and the positive pole of electrochemical capacitor C1 connect level output end.

The positive pole of 9V DC power supply links to each other with circuit anode VCC, and the negative pole of 9V DC power supply links to each other with circuit ground GND.

Description of drawings

Accompanying drawing 1 is the embodiment circuit working schematic diagram that the present invention provides an electronic microswitch open in usual.

Embodiment

Circuit working schematic diagram and description of drawings according to electronic microswitch open in usual shown in the accompanying drawing 1; And according to the annexation between the components and parts in the described each several part circuit of summary of the invention, and the components and parts technical parameter described in the execution mode requires to implement to realize the present invention.

The parameter of components and parts and selection requirement

IC1 is two inputs, four NAND gate circuits, and the model of selecting for use is CD4011, and embodiment only uses two NAND gate circuits wherein;

It is the 1/8W metalfilmresistor that resistance is selected power for use, and resistance R 1 is 100k Ω with resistance R 2 resistances; The resistance of resistance R 3 is 56 Ω;

The sheet metal of touch electrode useful size 10mm * 8mm is made, and also can directly be etched in touch electrode CM on the pcb board;

C1 is an electrochemical capacitor, and its range of capacity is: 10～220 μ F/16V;

The operating voltage of the DC power supply DC of present embodiment is 9V.

Circuit production main points and circuit debugging

For make electronic microswitch open in usual can be near heavy current installation reliably working, avoid electromagnetic interference, the lead-in wire of touch electrode CM is as far as possible away from other pin of two inputs, four NAND gate circuit IC1;

Touch electrode CM can directly be etched on the pcb board;

The pin that two inputs, four NAND gate circuit IC1 do not use is ground connection all!

Two inputs, four NAND gate circuit IC1 are cmos circuit, and it is easy to damage because of static discharge.Therefore, when welding two inputs, four NAND gate circuit IC1 pin the time, must keep human body and circuit board that earth protective device is all arranged;

By preventing that IC1 is damaged by static in welding process, the IC socket is used in suggestion;

Require the circuit board outside to use metal shell, and metal shell should reliably be connected with circuit ground GND;

The capacity of adjustment electrochemical capacitor C1 can change the width of output level, and the 3rd pin that changes two inputs, four NAND gate circuit IC1 is exactly exported holding time of high level.

Claims

1. electronic microswitch open in usual, it comprises 9V DC power supply, touch electrode CM, astable multibrator circuit and level output end, it is characterized in that:

The astable multibrator circuit is made up of two inputs, four NAND gate circuit IC1, touch electrode CM, resistance R 1, electrochemical capacitor C1, resistance R 2 and resistance R 3; The model that two inputs, four NAND gate circuit IC1 select for use is CD4011; The end of the 1st pin connecting resistance R2 of two inputs, four NAND gate circuit IC1 and an end of resistance R 3; The end of electrode CM is touched in the other end contact of resistance R 2; The anodal VCC of the 14th pin of two inputs, four NAND gate circuit IC1 and the other end connection circuit of resistance R 3; The 2nd pin of two inputs, four NAND gate circuit IC1 connects the 4th pin of two inputs, four NAND gate circuit IC1; The 5th pin of two inputs, four NAND gate circuit IC1 links to each other with the negative pole of electrochemical capacitor C1 and an end of resistance R 1 with the 6th pin, the other end connection circuit ground GND of the other end of resistance R 1 and touch electrode CM, and the 3rd pin of two inputs, four NAND gate circuit IC1 and the positive pole of electrochemical capacitor C1 connect level output end.

2. electronic microswitch open in usual according to claim 1 is characterized in that: the positive pole of 9V DC power supply links to each other with circuit anode VCC, and the negative pole of 9V DC power supply links to each other with circuit ground GND.