CN204256983U

CN204256983U - A kind of traffic signal light fault testing circuit

Info

Publication number: CN204256983U
Application number: CN201420760247.9U
Authority: CN
Inventors: 陈宗仁
Original assignee: XIAMEN AITONG INFORMATION TECHNOLOGY Co Ltd
Current assignee: XIAMEN AITONG INFORMATION TECHNOLOGY Co Ltd
Priority date: 2014-12-08
Filing date: 2014-12-08
Publication date: 2015-04-08
Anticipated expiration: 2024-12-08

Abstract

The utility model relates to traffic signals detection technique field, be specifically related to a kind of traffic signal light fault testing circuit, comprise single-chip microcomputer, be connected to photo-coupler OPT1 and OPT2 that two of Single-chip Controlling end has identical nonlinear transmission characteristic, photo-coupler OPT1 directly connects Single-chip Controlling end, Single-chip Controlling end is undertaken being connected to photo-coupler OPT2 oppositely by phase inverter U1, photo-coupler OPT1 output terminal controls the trigger end of a K switch 1, K switch 1 output terminal is connected in series current transformer with between signal lamp live wire, transformer secondary exports the electric current for detecting lamp drive circuit, photo-coupler OPT2 output terminal controls the trigger end of a K switch 2, the input end of K2 also receives the output terminal of K1, the output terminal of K2 be connected in series a power resistor R1 between signal lamp zero line.The utility model applies in traffic signals drive circuit, and circuit stability is reliable, and highly sensitive, sensing range is wide, and Absorbable organic halogens detects the LED lamp panel of minimum 1W.

Description

A kind of traffic signal light fault testing circuit

Technical field

The utility model relates to traffic signals detection technique field, is specifically related to a kind of traffic signal light fault testing circuit.

Background technology

Traffic signal light fault is divided into two large classes: normal bright fault and fault of often going out.Green conflict is also caused by normal bright fault.The detection mode of current traffic lights comprises current detecting and voltage detecting, and current detecting is for detecting long fault of going out, and voltage detecting is for detecting normal bright fault.Other producers are generally two kinds of modes: first: current detecting and voltage detecting are connected a circuit and be combined realization to the long detection of going out of the Chang Liangyu of traffic lights.This mode circuit is complicated, and required element material is many, very unfavorable for PCB placement-and-routing.Second: only grow to red light detection of going out, carry out normal bright detection to green light, this mode cannot obtain all malfunctions of all LED signal lamp panels.

Utility model content

In order to solve the problems of the technologies described above, the utility model provides a kind of traffic signal light fault testing circuit, improves current detection circuit, realizes the Chang Liang of signal lamp and detection of often going out.

In order to achieve the above object, the technical scheme that the utility model adopts is, a kind of traffic signal light fault testing circuit, comprise single-chip microcomputer, be connected to photo-coupler OPT1 and OPT2 that two of Single-chip Controlling end has identical nonlinear transmission characteristic, photo-coupler OPT1 directly connects Single-chip Controlling end, Single-chip Controlling end is undertaken being connected to photo-coupler OPT2 oppositely by phase inverter U1, photo-coupler OPT1 output terminal controls the trigger end of a K switch 1, K switch 1 output terminal is connected in series current transformer with between signal lamp live wire, transformer secondary exports the electric current for detecting lamp drive circuit, photo-coupler OPT2 output terminal controls the trigger end of a K switch 2, the input end of K2 also receives the output terminal of K1, the output terminal of K2 be connected in series a power resistor R1 between signal lamp zero line.

Further, described photo-coupler OPT2 output terminal is connected in series the trigger end of a K switch 2, and is connected in series a resistance R2 between photo-coupler OPT2 output terminal and K switch 2 trigger end, and resistance R2 is the current-limiting resistance of K switch 1 trigger end.Increase K switch 2 controlling resistance R1 whether to be connected on testing circuit, reduce the power attenuation that when normally exporting, resistance R1 brings.

The utility model is by adopting technique scheme, and compared with prior art, tool has the following advantages:

The utility model utilizes current transformer to detect electric current, adding a power resistor for detecting simultaneously, making it to realize LED signal lamp panel bright, the real-time current under state of going out on circuit.Coordinate control signal, the just state of known lamp panel.Apply in traffic signals drive circuit, circuit stability is reliable, and highly sensitive, sensing range is wide, and Absorbable organic halogens detects the LED lamp panel of minimum 1W.

Accompanying drawing explanation

Fig. 1 is the circuit theory diagrams of embodiment of the present utility model.

Embodiment

Now with embodiment, the utility model is further illustrated by reference to the accompanying drawings.

As a specific embodiment, as shown in Figure 1, a kind of traffic signal light fault testing circuit of the present utility model, comprise single-chip microcomputer, be connected to photo-coupler OPT1 and OPT2 that two of Single-chip Controlling end has identical nonlinear transmission characteristic, photo-coupler OPT1 directly connects Single-chip Controlling end, Single-chip Controlling end is undertaken being connected to photo-coupler OPT2 oppositely by U1, photo-coupler OPT1 output terminal controls the trigger end of a K switch 1, K switch 1 output terminal is connected in series current transformer with between signal lamp live wire, transformer secondary exports the electric current for detecting lamp drive circuit, photo-coupler OPT2 output terminal controls the trigger end of a K switch 2, the input end of K2 also receives the output terminal of K1, the output terminal of K2 be connected in series a power resistor R1 between signal lamp zero line.Power resistor R1 is as backflow resistance, and make circuit can detect normal bright state, existing scheme only can detect state of often going out by current detecting,

The present embodiment is connected in series the trigger end of a K switch 2 at described photo-coupler OPT2 output terminal, and is connected in series a resistance R2 between photo-coupler OPT2 output terminal and K switch 2 trigger end, and resistance R2 is the current-limiting resistance of K switch 1 trigger end.Increase K switch 2 controlling resistance R1 whether to be connected on testing circuit, reduce the power attenuation that when normally exporting, resistance R1 brings.According to the value of resistance R1, K switch 2 can be removed, directly use photo-coupler OPT2 to control path, simplify circuit.Concrete computation process is as follows: when the value of R1 is larger, little by electric current, the directly actuated mode of optocoupler can be adopted, optocoupler general control current limit tens milliamperes (this value need according to select optocoupler technical manual and determine) within, according to Ohm law, I=U/R, calculate by resistance R1 electric current, compare with optocoupler output current again, then only can use optocoupler as optocoupler output current is greater than by the electric current of R1, and not need to increase K1 controllable silicon separately again.

The principle of work of the present embodiment is:

The light on and off of signal lamp are controlled by K switch 1, the K2 not conducting when K1 conducting.

During K1 conducting, signal lamp lights, and when now bulb is normal, current transformer has output, current transformer no-output during bulb open circuit;

During K1 not conducting, signal lamp extinguishes, mutual inductor no-output under normal circumstances.When K1 fault punctures, or during outside line overlap joint, signal lamp lights, and because now K2 is in conducting state, therefore have a road electric current by R1 and pass through, therefore current transformer has output, thus judges normal bright state.

Although specifically show in conjunction with preferred embodiment and describe the utility model; but those skilled in the art should be understood that; not departing from the spirit and scope of the present utility model that appended claims limits; can make a variety of changes the utility model in the form and details, be protection domain of the present utility model.

Claims

1. a traffic signal light fault testing circuit, it is characterized in that: comprise single-chip microcomputer, be connected to photo-coupler OPT1 and OPT2 that two of Single-chip Controlling end has identical nonlinear transmission characteristic, photo-coupler OPT1 directly connects Single-chip Controlling end, Single-chip Controlling end is undertaken being connected to photo-coupler OPT2 oppositely by phase inverter U1, photo-coupler OPT1 output terminal controls the trigger end of a K switch 1, K switch 1 output terminal is connected in series current transformer with between signal lamp live wire, transformer secondary exports the electric current for detecting lamp drive circuit, photo-coupler OPT2 output terminal controls the trigger end of a K switch 2, the input end of K2 also receives the output terminal of K1, the output terminal of K2 be connected in series a power resistor R1 between signal lamp zero line.

2. a kind of traffic signal light fault testing circuit according to claim 1, it is characterized in that: described photo-coupler OPT2 output terminal is connected in series the trigger end of a K switch 2, and a resistance R2 is connected in series between photo-coupler OPT2 output terminal and K switch 2 trigger end, resistance R2 is the current-limiting resistance of K switch 1 trigger end.