CN2183051Y

CN2183051Y - Human body induction switch

Info

Publication number: CN2183051Y
Application number: CN 94205381
Authority: CN
Inventors: 刘立峰
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-03-26
Filing date: 1994-03-26
Publication date: 1994-11-16
Anticipated expiration: 2004-03-26

Abstract

The utility model discloses a human body induction switch for automatically controlling light. The circuit structure of the utility model comprises an oscillation circuit, an amplifying comparison circuit, a monostable delay drive circuit, a light control circuit, and a power supply circuit. The utility model is characterized in that the method that a diode is matched with an operational amplifying circuit is adopted in the light control circuit, the output end of the operational amplifying circuit directly short-circuits signal current, so the reliability and the stability of products is enhanced; in addition, the antenna of the oscillating circuit is converted into rectangle-shaped antenna with an opening, so the size of the switch is reduced largely, and the production cost is lowered.

Description

Human body induction switch

The utility model belongs to the automatic control lamp optical switch, particularly a kind of human induction switch.

At present, the human induction switch that utilizes public technology to produce, the lamp head type of the main with good grounds electromagnetic Doppler effect principle design of kind and wall-hanging two kinds.The circuit of this class switch all comprises oscillating circuit, amplifies comparison circuit, the monostable time delay drive circuit, and several parts of light-operated circuit and power circuit constitute.Its shortcoming is 1. to adopt in the light-operated circuit diode to come forming circuit, thus occurred that light-operated point is inaccurate, temperature is floated greatly, near the control point jitter in addition, also make circuit complicated, reduced the reliability and stability of complete machine; 2. the inductance coil that is used as antenna in the oscillating circuit adopts circular coil or rod-pulling type antenna, and consequence is that the volume of switch is difficult for dwindling.

Task of the present utility model provides a kind of new human induction switch, and this switch not only has reliability and stability preferably, and also has volume little, the advantage that production cost is low.

Task of the present utility model is achieved through the following technical solutions: by oscillating circuit, amplify comparison circuit, and the monostable time delay circuit, in the circuit that light-operated circuit and power circuit are formed, the diode VD of light-operated circuit ₂Negative pole and discharge circuit N ₃Output be connected anodal and current-limiting resistance R ₁₂With switching diode VD ₁Points of common connection be connected, make the output of discharge circuit can direct short-circuit signal code.

Compared with prior art, the utility model has been introduced the technological means that matches with discharge circuit with diode in light-operated circuit, makes that discharge circuit can the direct short-circuit signal code.Facts have proved, like this light-operated circuit of Gou Chenging have light-operated point accurately, temperature floats lowly, reduced near the jitter of the switch light-operated circuit control point, also simplified circuit simultaneously, improved the reliability and stability of switch.

The utility model is described further by embodiment below in conjunction with accompanying drawing:

Fig. 1 is the utility model circuit theory diagrams;

Fig. 2 is the utility model antenna structure view;

Among Fig. 1, oscillating circuit is by triode VT ₁, inductance coil L ₁, L ₂, capacitor C ₁, load resistance R ₁, go up biasing resistance R ₂, negative feedback resistor R ₃Form.Inductance coil L as antenna ₂Can be the rectangle single-turn circular coil of an opening, the coil two ends be to the rectangular aperture invagination, and invagination length b is 30 millimeters, and spacing a is the 10-25 millimeter, suitably aligns spacing and can improve circuit sensitivity.Facts have proved that this rectangular-shaped antenna is under with circular antenna same effect situation, volume can be done forr a short time, and area is 75% of circular antenna approximately.Amplifying circuit is by coupling capacitance C ₂, N ₁Positive input terminal, protective resistance R ₅, negative feedback resistor R ₆And resistance R ₇, R ₈Form R ₇, R ₈Play the effect of series connection dividing potential drop, make discharge circuit N ₁, N ₂Positive input terminal, N ₄Negative input end be in the mid-point voltage of power supply.Comparison circuit is by discharge circuit N ₂, divider resistance R ₁₀, R ₁₁Form R ₁₀, R ₁₁Be N ₂Negative input end provide reference voltage, R ₉Be N ₂The earth resistance of positive input terminal.The monostable drive circuit is by discharge circuit N ₄, timing capacitor C ₈, and timing resistor R ₁₅, positive feedback resistor R ₁₆Form.N ₄Output through current-limiting resistance R ₁₇Bidirectional triode thyristor is directly triggered, make its conducting.Light-operated circuit is by discharge circuit N ₃, resistance R ₁₄, photo resistance Rs, capacitor C ₇, current-limiting resistance R ₁₂, diode VD ₁, VD ₂, form R ₁₄, Rs is discharge circuit N ₃Positive input terminal provide light strong and weak signals voltage to be provided with.C ₇For preventing to cause that circuit erroneous action adds after Rs light from being blocked in short-term.Diode VD ₂Negative pole and discharge circuit N ₃Output be connected anodal and current-limiting resistance R ₁₂With diode VD ₁Points of common connection be connected.VD ₁Effect be that the positive feedback current of positive input terminal is not by VD when monostable circuit is worked ₂Shorted to earth.VD ₂Effect be to work as N ₃Output when being low level, N ₂The electric current of output is through R ₁₂Shorted to earth; Work as N ₃During output output high level, VD ₂Can block N ₃The voltage of output is added to R ₁₂With VD ₁Points of common connection on.Power circuit is by capacitor C ₉, C ₁₀, C ₁₁, resistance R ₁₈, diode VD ₃-VD ₅And three terminal regulator 78L09 forms.Above-mentioned amplifier integrated package N ₁-N ₄Can select LM324N for use.

Fig. 2 shows the inductance coil L that is used as antenna in the oscillating circuit ₂Structure, L ₂Be the rectangle single turn planar coil of an opening, coil two ends are to rectangular aperture place invagination, and invagination length b is about 30 millimeters, and spacing a is the 10-15 millimeter.Change spacing and can adjust the matching efficiency of antenna and circuit.Product provides operating current by power circuit, by L after installing ₂Spatial emission electromagnetic wave towards periphery.Someone is at L ₂Near when movable, the reflected wave of human body is again by L ₂Receive, cause VT ₁The minor variations of collector voltage, the voltage of this variation is by the N in the four high guaily unit ₁Send into N after the amplification ₂Compare and enlarge N ₂Output voltage about changing between 0-9 volt, this voltage is through VD ₁Remove to trigger N ₄The monostable time delay circuit that constitutes removes to trigger controllable silicon VS by the monostable time delay circuit and makes its conducting, and lamp is bright, and behind the time-delay certain hour (about 25-30 second), monostable circuit resets, and lamp extinguishes.As human body once more near the time, switch repetitive operation.

Claims

1, a kind of human induction switch, circuit part is made of oscillating circuit, amplification comparison circuit, monostable time delay drive circuit, light-operated circuit and power circuit, it is characterized in that the diode VD in the light-operated circuit ₂Negative pole and discharge circuit N ₃Output be connected anodal and current-limiting resistance R ₁₂With diode VD ₁Points of common connection be connected.

2,, it is characterized in that being used as in the described oscillating circuit inductance coil L of antenna according to the human induction switch of claim 1 ₂It is the rectangular-shaped single turn planar coil of an opening.