CN2097478U

CN2097478U - Human body induction auto-switch

Info

Publication number: CN2097478U
Application number: CN 91206662
Authority: CN
Inventors: 钮云超
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-04-25
Filing date: 1991-04-25
Publication date: 1992-02-26

Abstract

The utility model belongs to an induction auto-switch. The switch automatically switches on when people walk into the sensitive zone of the induction switch, and the switch automatically switches off after a delay time set by people. The induction auto-switch is composed of an ultrahigh frequency generator, an amplifier, a comparator, a monostable circuit, a drive circuit and a power source. The utility model has the advantages of reasonable design and simple structure, and provides a human body induction switch for automatic control.

Description

Human body induction auto-switch

The utility model relates to a kind of human induction switch, and as people during near the sensitizing range of inductive switch, switch is connected automatically, and behind the one section artificial official hour of delaying time, can close automatically again.

At present, the induction type automatic switch generally adopts heat to release passive and outer acquisition sensor, and this transducer needs the Fresnel optical lens of configure dedicated and high-gain adapter amplifier to work, although its function admirable, the cost height is difficult for popularizing.

The purpose of this utility model provides a kind of highly sensitive, and is simple in structure, the inductive switch of inexpensive practicality.

The purpose of this utility model is achieved in that upright antenna directly concentrates the utmost point to draw from ultrahigh frequency triode, and ultra-high frequency generator is connected with signal amplifier by coupling capacitance, and amplifier out connects the input of level comparator.Its output order stable state delay circuit, monostable circuit drives relay by triode.During ultra-high frequency generator work, around upright antenna, generate an electromagnetic field, when people move in electromagnetic field, the reflected wave of human body makes the amplitude of ultra-high frequency generator and frequency all produce respective change by antenna, and this changes earlier and amplifies through amplifier, and then can change it into square-wave pulse by level comparator, single stabilization delay circuit is subjected to the triggering of square-wave pulse and overturns, during the monostable time delay, the triode conducting also drives relay J adhesive, switch connection.

Owing to adopted such scheme, circuit structure is simple, and the detectivity height has only used a popular amplifier, road during a NOR gate is integrated, two triodes and resistance capacitance etc.

Below in conjunction with drawings and Examples the utility model is further specified

Fig. 1 is the utility model block diagram

Fig. 2 is the utility model line map

The utility model principle is shown in Figure 1.(20) be ultra-high frequency generator, (10) be upright antenna, as long as have human body to move around it, (10) magnetic field on every side just changes thereupon, because the effect of (10), this variation will cause that the amplitude of (20) and frequency also all produce corresponding the variation, this variation send amplifier (30) to amplify, (30) output voltage analog signal, (40) be level comparator, it changes into square-wave pulse with voltage analog signal, regulates the threshold level value of comparator, can determine the sensitivity of inductive switch; (50) be monostable circuit, its RC constant, length turn-on time of decision inductive switch; (60) be drive circuit; (70) be power supply.Below in conjunction with the concrete elaboration of Fig. 2 embodiment of the present utility model.The utility model circuit as shown in Figure 2, triode BG ₁Base stage meet biasing resistor R ₁, R ₂With feedback capacity C ₁BG ₁Emitter through negative feedback resistor R ₃To ground; BG ₁Collector electrode meet upright antenna T, high frequency resistance choking coil L and feedback capacity C respectively ₁Resistance R ₄A termination radio frequency choke L, another termination positive supply; Capacitor C ₂With resistance R ₄And connect.Triode BG ₁In capacitor C ₁Effect produce down vibration, when the people is mobile in the electromagnetic field around the antenna T, its reflected wave from antenna feed to BG ₁Base stage all changes the amplitude of ultra-high frequency generator and frequency, and the radio frequency choke people changes this through coupling capacitance C ₃Deliver to by IC ₁, capacitor C ₄, resistance R ₅-R ₇The amplifier of forming carries out signal and amplifies.IC ₁Normal phase input end meet biasing resistor R ₅, R ₆IC ₁Inverting input meet coupling capacitance C ₃IC ₁Inverting input and output between connect the decision amplifier gain resistance R ₇, remove self-excitation capacitance C ₄With photo resistance RD.By IC ₂, resistance R ₈, R ₉Constitute level comparator, IC ₂Normal phase input end and amplifier IC ₁Output link to each other; IC ₂Inverting input connecting resistance R ₈, R ₉, regulate R, can determine the threshold level of comparator, determine the sensitivity of inductive switch with this.When human body moved, comparator output square-wave pulse was than pulse-triggered IC ₃, IC ₄, capacitor C ₅, resistance R ₁₀The monostable circuit upset that constitutes, flip-flop transition, length was by R ₁₀With C ₅The constant decision.Monostable circuit IC ₃Input and level comparator IC ₂Output link to each other; IC ₃Another input and IC ₄Output link to each other IC ₃Output termination capacitor C ₅C ₅Other end connecting resistance R ₁₀And IC ₄Input.BG ₂Base subject to resistance R ₁₁With IC ₄Output links to each other, BG ₂Emitter succeed electrical equipment J, diode D ₁With the coil of relay and connect, during the monostable upset, triode BG ₂Drive the relay J adhesive, JK is a relay normally open contact.

Power supply is by full-bridge D ₂, resistance R ₁₂, capacitor C ₆, C ₇Voltage-stabiliser tube DW ₁And three terminal regulator DW ₂Constitute full-bridge D ₂A termination AC220V of interchange end; The other end is through step-down current limiting capacitance C ₇, resistance R ₁₂Meet AC220V; D ₂Plus earth, D ₂Negative pole meet voltage-stabiliser tube DW respectively ₁Negative pole, capacitor C ₆Positive pole and three terminal regulator DW ₂Input.

RD is a light sensation resistance, and on daytime, when ambient light illumination was higher than 10 luxs, the RD resistance reduced, TC ₁Gain descends, and inductive switch is in off-state automatically.Photo resistance RD can not connect yet, and when not meeting RD, inductive switch is not influenced by light.

Claims

1, a kind of human body sensing automatic switch is characterized in that by hyperfrequency acoustical generator [20], and upright antenna [10], amplifier [30], level comparator [40], monostable [50], driver [60], power supply [70] constitute; It is characterized in that:

(1) triode BG ₁Base stage meet biasing resistor R ₁, R ₂With feedback capacity C ₁BG ₁Emitter through negative feedback resistor R, to ground; BG ₁Collector electrode meet upright antenna T, radio frequency choke L, feedback capacity C respectively ₁Resistance R ₄A termination radio frequency choke L, another termination positive supply, capacitor C ₂With resistance R ₄And connect;

(2) amplifier IC ₁Normal phase input end meet biasing resistor R ₅, R ₆IC ₁Inverting input meet coupling capacitance C ₃IC ₁Inverting input and output between connect the decision amplifier increase poor resistance R ₇, eliminate self-excitation capacitance C ₄With photo resistance RD;

(3) level comparator IC ₂Normal phase input end and amplifier IC ₁Output link to each other IC ₂Inverting input connecting resistance R ₈, R ₉

(4) monostable circuit IC ₃Input and level comparator IC ₂Defeated end link to each other IC ₃Another input and IC ₄Output link to each other IC ₃Output termination capacitor C ₅, C ₅Other end connecting resistance R ₁₀And IC ₄Input;

(5) drive triode BG ₂Base stage through resistance R ₁₁With IC ₄Output links to each other; BG ₂Emitter succeed electrical equipment J, diode D ₁With the coil of relay and connect;

(6) full-bridge D ₂A termination AC220V of interchange end; The other end is through step-down current limiting capacitance C ₇, resistance R ₁₂Meet AC220V; D ₂Plus earth; D ₂Negative pole meet voltage-stabiliser tube DW respectively ₁Negative pole, capacitor C ₆Positive pole and three terminal regulator DW ₂Input.