CN2263431Y

CN2263431Y - Photoelectric automatic control switch

Info

Publication number: CN2263431Y
Application number: CN 92246071
Authority: CN
Inventors: 仇成多
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-12-20
Filing date: 1992-12-20
Publication date: 1997-09-24
Anticipated expiration: 2002-12-20

Abstract

The utility model relates to a photoelectric automatic control switch, which comprises a case and a circuit part. The circuit part is encapsulated in the case by asphaltum, and the circuit part comprises a photoelectric conversion circuit, an alternating current-direct current control switching circuit, a horse power expansion and short protection circuit and a load power supply loop. The utility model overcomes the shortcomings of high cost, complicated structure and poor reliability of an ordinary photoelectric self control switch, which has the advantages of simple structure, low cost, energy conservation, long service life and wide scope.

Description

The photoelectricity autocontrol switch

The utility model relates to a kind of photoelectricity autocontrol switch.

Present known photoelectricity automatic transfer equipment is with the transformer step-down after the control power supply is made in rectification, filtering, voltage stabilizing, carries out opto-electronic conversion by comparison circuit again, and the control executing mechanism action drives A.C. contactor and removes to open and close circuit.This photoelectric conversion device, transformer is wanted consumed power and is produced heat, and photoelectric switching circuit and actuator also want current sinking, promptly do not economize on electricity and unfavorable long-term work, and the cost of transformer is also higher; The circuit complexity of rectifying and voltage-stabilizing and opto-electronic conversion, requirement is high, element is many, is easy to generate the fault misoperation; The cost height of actuator, contactor, contact is many, will produce spark during action, not only dangerous but also be not durable, should not install in the open, simultaneously, because moment circuit connection is opened by actuator, cold filament in the circuit will be subjected to the impact of heavy current, the controlled lamp life-span is shortened dramatically, and because of electrical appliance in the late into the night electrical network reduces, supply voltage raises naturally again, do not have decompressor, filament often blows because of overvoltage.When photosensitive head is subjected to unexpected illumination, also to close lamp completely.Therefore, for all the foregoing reasons, the use of this normal optical electricity automatic transfer device will be very restricted.

The purpose of this utility model is to overcome the above-mentioned deficiency of normal optical electricity automatic transfer device and provide a kind of simple in structure, and cost is low, moves safe and reliablely, and is suitable for the photoelectricity autocontrol switch of outdoor mounted.

The utility model comprises housing and circuit part, and circuit part is by photoelectric switching circuit, alternating current-direct current control transformation circuit, and power expansion and short-circuit protection circuit and electric loop constitute, the bidirectional triode thyristor SCR in power expansion and the short-circuit protection circuit ₂The A utmost point and external circuit load join, the K utmost point is connected with the external circuit power supply, bidirectional triode thyristor SCR ₂G, the K utmost point be connected in the alternating current-direct current control transformation circuit bridge rectifier and exchange two ends, unidirectional controllable silicon S CR in the negative pole of bridge rectifier and the photoelectric switching circuit ₁A extremely continuous, anodal extremely link to each other, at unidirectional controllable silicon S CR with C ₁A, y interpolar serial connection current limliting trigger resistance R, y, c interpolar serial connection photoelectric receiving tube D ₅

At bidirectional triode thyristor SCR ₂And be serially connected with fuse S between the external circuit power supply.

Circuit part is encapsulated in the housing by pitch prill.

Below in conjunction with drawings and Examples detailed content of the present utility model is described.

Fig. 1 is an electrical schematic diagram of the present utility model;

Fig. 2 is the utility model assembly structure schematic diagram.

As shown in the figure, the utility model comprises housing (1) and circuit part (2), and housing (1) is formed by the insulating material pressure injection, and circuit part (2) is encapsulated in the housing (1) by pitch prill (3), and housing (1) is provided with and makes photosensitive tube D ₅Accept the window (4) of extraneous light.Circuit part is by photoelectric switching circuit, alternating current-direct current control transformation circuit, and power expansion and short-circuit protection circuit and electric loop constitute, the bidirectional triode thyristor SCR in power expansion and the short-circuit protection circuit ₂The A utmost point and external circuit load join, the K utmost point is connected with fuse S, the other end of fuse is connected with the external circuit power supply, bidirectional triode thyristor SCR ₂G, the K utmost point be connected in the alternating current-direct current control transformation circuit bridge rectifier and exchange two ends, unidirectional controllable silicon S CR in the negative pole of bridge rectifier and the photoelectric switching circuit ₁A extremely continuous, anodal and the C utmost point be the limit mutually, at unidirectional controllable silicon S CR ₁A, y interpolar serial connection current limliting trigger resistance R, y, c interpolar serial connection photoelectric receiving tube D ₅, y termination positive pole wherein, C termination negative pole.By day, photoelectric receiving tube D ₅Be subjected to light, the forward internal resistance seldom, the positive half cycle of 220V AC power is through load ZD-bidirectional triode thyristor SCR ₂The A-G utmost point-bridge rectifier in D ₁-current limliting triggers resistance R-photoelectric receiving tube D ₅D in the-bridge rectifier ₃-fuse S constitutes the loop; The D of negative half period in fuse S-bridge rectifier ₄-current limliting triggers resistance R-photoelectric receiving tube D ₅D in the-bridge rectifier ₂-bidirectional triode thyristor SCR ₂In the G utmost point-A utmost point-load ZD constitute the loop; Unidirectional controllable silicon S CR ₁Because of by photoelectric receiving tube D ₅Short circuit can not get trigger current and ends, and is subjected to SCR ₁The bidirectional triode thyristor SCR of control ₂Because of the control electrode current much smaller than trigger current, also can't conducting, lamp does not work.Evening, photoelectric receiving tube D ₅Internal resistance cumulative, during to certain value, unidirectional controllable silicon S CR ₁Trigger current form thereupon, and conducting gradually, lamp is gradually bright, daybreak D ₅Be subjected to light, lamp gradually puts out.Go round and begin again.

The utility model has been simplified the labyrinth of common photoelectricity automatic control conversion equipment greatly by said structure, its reliable working performance, and low-light (level) opens and closes, the little consumption of closed state, saved the energy, and state is installed and used in the open, be applicable to the Automatic Control of lamps such as street lamp, street lamp, gate light.

Claims

1, a kind of photoelectricity autocontrol switch; comprise housing and circuit part; it is characterized in that circuit part (2) is made of the bidirectional triode thyristor SCR in power expansion and the short-circuit protection circuit photoelectric switching circuit, alternating current-direct current control transformation circuit, power expansion and short-circuit protection circuit and electric loop ₂The A utmost point and external circuit load join, K utmost point external circuit power supply is connected bidirectional triode thyristor SCR ₂G, the K utmost point be connected in the alternating current-direct current control transformation circuit bridge rectifier and exchange two ends, unidirectional controllable silicon S CR in the negative pole of bridge rectifier and the photoelectric switching circuit ₁A extremely continuous, anodal and the C utmost point be the limit mutually, at unidirectional controllable silicon S CR ₁A, y interpolar serial connection current limliting trigger resistance R, y, c interpolar serial connection photoelectric receiving tube D ₅

2, photoelectricity autocontrol switch according to claim 1 is characterized in that bidirectional triode thyristor SCR in power expansion and the short-circuit protection circuit ₂And serial connection fuse S between the external circuit power supply.

3, photoelectricity autocontrol switch according to claim 1 and 2 is characterized in that circuit part (2) is encapsulated in the housing (1) by pitch prill (3).