CN204761415U

CN204761415U - Light separates terminal with output protect function

Info

Publication number: CN204761415U
Application number: CN201520429007.5U
Authority: CN
Inventors: 倪晓程
Original assignee: Chengdu Reliance Electric Co Ltd
Current assignee: Chengdu Reliance Electric Co Ltd
Priority date: 2015-06-23
Filing date: 2015-06-23
Publication date: 2015-11-11
Anticipated expiration: 2025-06-23

Abstract

The utility model discloses a light separates terminal with output protect function, it comprises optoelectronic coupler component and relevant auxiliary circuit, insulating casing, binding post, its characterized in that: install in insulating casing (1) circuit board (2) that optoelectronic coupler and relevant auxiliary circuit form, is equipped with binding post (3) on the shell, is connected with input, the output circuit of circuit board, does the signal break -make through LED emitting diode in the input circuit and indicate, is equipped with the current -limiting circuit among the output circuit, and maximum current among the restriction output circuit realizes the effect of protection opto -coupler itself and load, the utility model discloses simple structure, stable performance, low cost can be applied to the electric isolation between various control circuit and the on -the -spot circuit.

Description

A kind of light with output protecting function is every terminal

Technical field

The utility model can be widely used in electric power system, automation control system, the electrical isolation between control circuit and on-the-spot circuit.

Background technology

Along with improving constantly of industrial automatization, electrical isolation between control circuit and on-the-spot circuit demonstrates importance day by day, as the core of robot control system(RCS), control unit reliably must be kept apart with each transducer and actuator, to avoid interference, and common binding post only can realize the electrical connection of signal, cannot suppress or isolate for the various interference in loop, likely cause system to produce misoperation, misoperation, serious also will cause damage.

Photoelectrical coupler can complete the function of electrical isolation well, it is a kind of element optical transmitting set and optical receiver are encapsulated in same chip, when input electrical signal is added to optical transmitting set, inner generation luminous energy, receiver receives light energy signal and converts the signal of telecommunication to, export after treatment, so just achieve the conversion of " electrical-optical-electricity ", the only medium of Signal transmissions, thus input and output are insulation on electrically, achieve the isolation of electric signal, but because photoelectrical coupler element only can realize the isolation transmission of weak signal, in actual applications, need according to its applied environment, add various coupling, protective circuit, as: the Signal Matching circuit of input, the expansion stream of output, diffusion circuit, indicating circuit, protection circuit for input and output etc., also need shell in addition, realize protective circuit plate, the needs of wiring and installation.

Summary of the invention

For the demand of above-mentioned application, the utility model proposes a kind of structure simple, reasonable in design, application is simple, there is the light of output protecting function simultaneously every terminal, it is by insulation crust (1), circuit board (2), binding post (3) forms, its middle connecting terminal is arranged on insulation crust both sides, be connected respectively to signal on circuit board input, output, in the input circuit of terminal, LED light-emitting diode is in series with at light, realize the function of signal break-make instruction, current-limiting circuit is provided with in output loop, maximum current in output loop can be limited, realize the effect of protection optocoupler itself and load, the utility model stable performance, with low cost, the electrical isolation between various control circuit and on-the-spot circuit can be applied to.

the utility model solves its technical problem, and the technical scheme adopted is:

Have the light of output protecting function every a terminal, it is made up of photoelectrical coupler element, input circuit, indicating circuit, output expansion stream, diffusion circuit, output protection circuit, insulation crust, binding post.It is characterized in that: above circuit is installed on one piece of circuit board, and circuit board is loaded in insulation crust, and insulation crust both sides are provided with terminal, is connected respectively to the input of photoelectrical coupler, output.

On foregoing circuit plate, in optocoupler components U1 input circuit, string has resistance R1, R3 and indicator light LED1.

On foregoing circuit plate, photoelectrical coupler U1 emitter is connect and is connected by resistance R2 with triode T1 base stage, photoelectrical coupler collector electrode is connected with triode T1 collector electrode, triode T2 base stage is connected with triode T1 emitter, its T2 collector electrode is connected with triode T1 base stage, and T2 emitter is connected by resistance R4 with base stage.

compared with prior art, the beneficial effects of the utility model are:

The utility model proposes a kind of light with output protecting function every terminal; effectively can suppress the electrical Interference between input, output loop; improve accuracy, the reliability of electrical system control; and there is control signal break-make deixis; output is provided with current foldback circuit; play a very good protection every terminal itself and load to light, the utility model has life-span length, stable performance, advantage convenient for installation and maintenance.

Accompanying drawing explanation

below in conjunction with the drawings and specific embodiments, the utility model is described in further details.

Fig. 1 is elementary diagram of the present utility model.

Fig. 2 is basic block diagram of the present utility model.

In Fig. 1: IN+ is that output plus terminal GND is for exporting negative terminal for input anode IN-is input negative terminal VDD.

Embodiment

Operation principle of the present utility model as shown in Figure 1, input signal first through resistance R1, R3 step-down current limliting laggard enter the input of optic coupling element U1, the voltage and current of coupling is provided for U1 normally works, in its loop, also string has indicator light LED1, luminous when input circuit is energized, realize the deixis of control signal.

When after the luminescence of optocoupler interior light emitting diodes, its inner triode is excited conducting, electric current by the triode of optocoupler inside and resistance R2 for triode T1 base stage provides bias current, conducting between T1 collector and emitter, output loop is connected, and output current Io is by load RL.Otherwise after optic coupling element interior light emitting diodes is extinguished, disconnected by triode T1 ground level bias current, T1 turns off, and is equalled zero by the electric current I o of load RL, thus achieves the isolated controlling of constrained input thereupon.Output protection circuit is made up of T2 and R4, setting output maximum permissible current is Ios, the turn-on bias voltage of triode T2 is Uon, when after triode T1 conducting, the linear conversion trend of the electric current passed through with it by the voltage at resistance R4 two ends, the bias voltage Ube of T2 also changes thereupon, when Ube is less than Uon, T2 turns off, T1 base stage is all flowed to by the electric current of U1 and R2, make its abundant conducting, when load RL is due to abnormal cause short circuit, the corresponding increase of loop current Io, Ube voltage also increases thereupon, when Ube is more than Uon, triode T2 enters linear amplification region, a dynamic electric resistor is equivalent between its emitter and collector, its resistance value controls by Ube voltage swing, one part of current now for flowing to T1 base stage will be shunted by T2, because triode is Flow Control type element, T1 bias current reduces to cause the corresponding reduction of the electric current I o of output loop, thus achieve the current limliting of output loop, protect inner member and load does not damage because of overcurrent.

Structure of the present utility model as shown in Figure 2, by insulation crust (1), circuit board (2), binding post (3) forms, circuit board (2) is installed in insulation crust, and binding post (3) is installed in insulation crust both sides, is connected respectively to IN+, IN-, VDD, the GND on circuit board.

Claims

1. a light with output protecting function is every terminal; it is made up of insulation crust (1), circuit board (2), binding post (3); it is characterized in that: circuit board (2) is upper installs photoelectrical coupler element and relevant auxiliary circuit; input in circuit board (2), output loop are drawn by binding post (3); input circuit in its circuit does the instruction of signal break-make by LED 1; the current-limiting circuit be made up of triode T2, resistance R4 in output loop, maximum current in restriction output loop.

2. a kind of light with output protecting function according to claim 1 is every terminal; it is characterized in that: circuit board (2) is installed in insulation crust (1); insulation crust both sides are provided with binding post (3), are connected respectively to the input of photoelectrical coupler, output.

3. a kind of light with output protecting function according to claim 1 is every terminal; it is characterized in that: in the upper photoelectrical coupler U1 of described circuit board (2), transistor emitter is connected by resistance R2 with triode T1 base stage; in photoelectrical coupler, transistor collector is connected with triode T1 collector electrode; triode T2 base stage is connected with triode T1 emitter; its T2 collector electrode is connected with triode T1 base stage, and T2 emitter is connected by resistance R4 with base stage.

4. a kind of light with output protecting function according to claim 1 is every terminal, it is characterized in that: in the upper optocoupler components U1 input circuit of described circuit board (2), string has resistance R1, R3 and indicator light LED1.