CN102298819A

CN102298819A - High-temperature alarm system for explosion-proof LED (Light-Emitting Diode) lamp

Info

Publication number: CN102298819A
Application number: CN201110222278XA
Authority: CN
Inventors: 陈砚林
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-08-04
Filing date: 2011-08-04
Publication date: 2011-12-28

Abstract

The invention discloses a high-temperature alarm system for an explosion-proof LED (Light-Emitting Diode) lamp, belonging to the fields of explosion-proof illumination and high temperature abnormity alarm. Heat radiation of an LED device is classified into primary encapsulation heat radiation and secondary heat sink heat radiation; and a die-cast aluminum lamp body of the explosion-proof LED lamp is taken as a secondary heat sink for linking the joint of the LED with the external environment. Under the condition of high temperature, positive voltage and temperature of an LED are in a linear inverse relation at constant current, an MCU (Microprogrammed Control Unit) detects end voltages at the two ends of an LED string according to the change relation between the positive voltage and the temperature, a control bus transmits a signal to a high-temperature abnormity alarm host computer, and the host computer displays a schematic drawing corresponding to the position of the explosion-proof LED lamp of which the detection value surpasses a set value on a display. The host computer is used for controlling a certain quantity of explosion-proof LED lamps, and starting a loudspeaker for alarming if the temperature surpassing rate of the ambient temperatures of all explosion-proof LED lamps in the same region surpasses a set value.

Description

A kind of anti-explosion LED lamps high temperature alarm system

Technical field

The present invention relates to a kind of automatic alarm system, particularly relate to a kind of anti-explosion LED lamps high temperature alarm system.

Technical background

At present in petroleum and petrochemical industry operation place, equipment region, only think that at some important position is equipped with warning device, in case when having an accident preceding or having an accident, people can in time obtain early warning, retrieve or reduce the loss.Accident has the abnormality of high temperature mostly earlier, and the burning etc. that sets off an explosion then because the application of cost and warning system is met difficulty, is difficult to large tracts of land and uses general accident alarming device.So present fire fighting equipment is in the majority aspect putting out a fire to save life and property afterwards, early warning seems and obviously is short of.The explosion-proof lighting lamp that large tracts of land is used only has illumination functions, if illumination and accident alarming function can be combined, design a kind of high temperature alarm system that not only can popularize but also can rely mainly on prevention as the explosion-proof illuminating lamp large tracts of land, the utilization of this system is developing universal anti-explosion LED lamps, fringe cost is low, easy to use, and the so this light fixture that has explosion-proof light function and temperature alarming function concurrently has just solved the present situation that illumination functions and temperature alarming function can not be unified.

Summary of the invention

The present invention is exactly in order to solve the problems of the technologies described above, and a kind of anti-explosion LED lamps high temperature alarm system is provided, and it is simple in structure, and being provided with formerly has on the anti-explosion LED lamps, need not increase the volume of the temperature-sensitive unit of high temperature alarm system, can realize the high temperature alarm function.

In order to solve the problems of the technologies described above, the present invention is achieved through the following technical solutions:

A kind of anti-explosion LED lamps high temperature alarm system, it is to be made of following mechanism: anti-explosion LED lamps, be arranged on the MCU that anti-explosion LED lamps drives, the output terminal of MCU is connected with high temperature abnormal alarm host computer input end through control bus, and the output terminal of high temperature abnormal alarm host computer is connected with the input end of anti-explosion LED lamps region distribution schematic diagram display, loudspeaker.

Anti-explosion LED lamps high temperature alarm system field of employment environment temperature is through being transmitted to LED as secondary heat sink die casting aluminium lamp body and an encapsulated radiating structure, and the die casting aluminium lamp body that secondary is heat sink and encapsulated radiating structure constitute the thermal resistance between LED junction and the environment.Environment temperature, thermal resistance, LED junction temperature three thermal resistance be by product thermal design decision, in the use be constant quantitatively, when environment temperature raises, the corresponding rising of LED junction temperature.Under the high-temperature condition, the relation of LED forward voltage and the linear inverse ratio of temperature under steady current, MCU monitors LED string terminal voltage in real time, MCU and host computer compare detected voltage and change in voltage scope and setting value, host computer is handled comparative result, surpass showing of range of set value, when the ratio of all anti-explosion LED lamps environment temperature overtemperatures of same zone surpassed setting value, loudspeaker was reported to the police.

During use, after the staff hears that loudspeaker is reported to the police, find the relevant position, can check the reason that causes high temperature in the scene of catching up with rapidly, in time solve the problem that exists, shoot the arrow at the target according to the synoptic diagram of anti-explosion LED lamps position on the display.To always and everywhere cause in security fields vigilant, if through research and facts have proved when not being higher than certain temperature it is safe, can adjust the fiducial value of high temperature abnormal alarm host computer so in good time.

Advantage of the present invention and effect are as follows:

The present invention is simple in structure, and is easy to use, and it is arranged in the existing anti-explosion LED lamps, the distribution broad covered area.Centralized control is convenient to operation.In some scopes, judge whether to report to the police, reduce erroneous judgement and improve accuracy by certain ratio.Need not increase temperature sensing device and layout thereof, host computer, display, loudspeaker can be realized the high temperature alarm function to whole field of illumination.Can remedy the realizing of the imperceptible place that may hide unsafe factor of operator on duty, make security performance higher.

Description of drawings

Fig. 1 is the theory structure block scheme;

Fig. 2 is a block diagram;

Fig. 3 is a workflow diagram.

Among the figure: 1 anti-explosion LED lamps, 2MCU, 3 control buss, 4 high temperature abnormal alarm host computers, 5 anti-explosion LED lamps region distribution schematic diagram displays, 6 loudspeakers

Embodiment

Below in conjunction with accompanying drawing the present invention is described in further details.

As shown in Figure 1, a kind of anti-explosion LED lamps high temperature alarm of the present invention system, its principle is: during work, variation of ambient temperature causes anti-explosion LED lamps lamp body temperature variation, and the LED junction temperature changes thereupon.That is to say that the LED junction temperature changes with the variation of environment temperature because constant by the thermal resistance of a heat sink die casting aluminium lamp body of secondary and an encapsulated radiating structure.When environment temperature raises, the corresponding rising of LED junction temperature.Under the high-temperature condition, the relation of LED forward voltage and the linear inverse ratio of temperature under steady current.The variation and the coded signal output of MCU monitoring LED string terminal voltage, host computer compares detected value and setting value, comparative result surpasses the corresponding demonstration on the distribution schematic diagram display of anti-explosion LED lamps region of setting value, when the overtemperature quantity of the same area surpasses preset proportion, host computer sends signal, and loudspeaker is reported to the police.

Fig. 2 is a block diagram, the present invention is made of following structure: anti-explosion LED lamps 1, MCU2 in the anti-explosion LED lamps, the output terminal of MCU 2 is connected through the input end of control bus 3 with high temperature abnormal alarm host computer 4, and the output terminal of high temperature abnormal alarm host computer 4 and the input end of anti-explosion LED lamps 1 region distribution schematic diagram display 5, the input end of loudspeaker 6 are connected.

Fig. 3 is a workflow diagram, and the flow process of the concrete control of the present invention is as follows:

After anti-explosion LED lamps high temperature alarm system started working, anti-explosion LED lamps position environment temperature was transmitted to LED, anti-explosion LED lamps LED junction temperature respective change by secondary heat sink die casting aluminium lamp body and an encapsulated radiating structure.That is to say that the thermal resistance that LED junction temperature temperature is formed through the heat sink die casting aluminium lamp body of secondary and encapsulated radiating structure dispels the heat to environment, the effect that the height of environment temperature has influenced heat radiation has also promptly influenced the height of LED junction temperature.The variation of LED junction temperature makes LED forward voltage under steady current change, under the high-temperature condition, and the relation of LED forward voltage and the linear inverse ratio of temperature under steady current.

Step 1, MCU2 detects LED string terminal voltage, and magnitude of voltage is transferred to high temperature abnormal alarm host computer.

Step 2, whether upper computer detection LED string terminal voltage variation range surpasses setting value.If, then sending a signal to anti-explosion LED lamps region distribution schematic diagram display, display demonstrates the overtemperature state of this position; If not, then process finishes.

Step 3, upper computer detection the same area surpass setting value light fixture quantitative proportion and whether surpass setting value.Report to the police if then start loudspeaker; If not, then process finishes.

The present invention is by introducing MCU and its host computer, not only can monitor the environment temperature of anti-explosion LED lamps position, also provide display to show corresponding high temperature position synoptic diagram, loudspeaker high temperature exceptional state alarm treatment mechanism, improved intelligent, automatization level greatly.

Claims

1. anti-explosion LED lamps high temperature alarm system, the structure formation comprises the anti-explosion LED light fixture that contains MCU, control bus, high temperature abnormal alarm host computer, anti-explosion LED region distribution schematic diagram display, loudspeaker, it is characterized in that: under high-temperature condition, MCU changes anti-explosion LED lamps with variation of ambient temperature LED forward voltage signal, be transmitted to high temperature abnormal alarm host computer through control bus, the voltage signal variation range is if surpass setting value, then output signal shows at anti-explosion LED lamps region distribution schematic diagram display, when synoptic diagram the same area shows that the light fixture ratio of overtemperature surpasses setting value, the loudspeaker warning of sounding.

2. anti-explosion LED lamps high temperature alarm according to claim 1 system is characterized in that described MCU is arranged in the driving in the anti-explosion LED lamps.

3. anti-explosion LED lamps high temperature alarm according to claim 1 system is characterized in that the output terminal of described MCU is connected through the input end of control bus with high temperature abnormal alarm host computer.

4. anti-explosion LED lamps high temperature alarm according to claim 1 system, the output terminal that it is characterized in that described high temperature abnormal alarm host computer is connected input end and connects with anti-explosion LED lamps region distribution schematic diagram display input end, loudspeaker.

5. anti-explosion LED lamps high temperature alarm according to claim 1 system, display shows at corresponding areal distribution synoptic diagram when it is characterized in that the anti-explosion LED lamps overtemperature.

6. anti-explosion LED lamps high temperature alarm according to claim 1 system, when it is characterized in that in a certain zone being judged overtemperature greater than a plurality of anti-explosion LED lamps place environment temperature of preset proportion, loudspeaker is reported to the police.