CN2303999Y

CN2303999Y - Automatic bulb-changing device

Info

Publication number: CN2303999Y
Application number: CN 97236691
Authority: CN
Inventors: 李兴江
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-07-29
Filing date: 1997-07-29
Publication date: 1999-01-13
Anticipated expiration: 2007-07-29

Abstract

The utility model discloses an automatic bulb-changing device which comprises a general bulb, an alarm element, a spare bulb and a control circuit, wherein the alarm element is connected with the spare bulb in parallel and then is connected with the general bulb in parallel via the control circuit; the control circuit is mainly composed of a two-stage electronic elements with electric power and a sampling resistor. The automatic bulb-changing device can send out an audible and visual alarm automatically when a failure of a signal indicating lamp occurs, and can also keep the qualified state of the signal indicating lamp automatically without the need of parking and failure obviation. The automatic bulb-changing device has the outstanding advantages of simple and direct circuit, few elements, low cost, small size, stable performance, reliability, etc.

Description

Automatic bulb changer

The utility model relates to a kind of light fixture, especially a kind of vehicle signal lamp tool.

Along with science and technology development and progress, the mobility of various types of vehicles strengthens day by day, speed improves constantly.Therefore, turn to, the signal lamp of various functions such as braking become the vehicle safety requisite parts of advancing.China's " regulation of road traffic control " regulation: the lighting fixture of motor vehicles must keep complete effective, when in travelling lighting fault taking place, must repair the rear and there won't be any problem sail.These regulations are also stipulated: the driving light electro-optical device does not conform to the vehicle of safety requirements, will sentence fine below 50 yuan, can and locate to withhold driver's license below three months.

, the indicator lamp on the existing motor vehicles does not all have insurance or apparatus for automatic change, and is difficult to the service life of bulb expect.Therefore, car light extinguishes suddenly, and human pilot is entirely ignorant of or can't be in time adopted remedial measures, and the incident of being punished happens occasionally, and the traffic accident that causes thus is not rarely seen yet.For this reason, begin on some vehicle, to have installed additional " the automobile signal light fault monitor " of up-to-date development abroad.This monitor can by sound and light alarm, remind human pilot in time to take corresponding measure when signal lamp breaks down, and has certain positive effect.But this monitor can only play the supervision effect, in case the signals of vehicles indicator lamp breaks down, the troubleshooting of still need stopping delays normally unavoidably and travels.

The purpose of this utility model is: at above-mentioned the deficiencies in the prior art part, provide a kind of not only can be when signal lamp breaks down automatic sound-light alarm, and the dispense with parking troubleshooting just can make signal lamp keep the automatic bulb changer of eligible state automatically.

Technical solution of the present utility model is: automatic bulb changer, comprise bulb commonly used and alarm element, also comprise spare bulb and control circuit, described alarm element is in parallel with spare bulb, in parallel by control circuit again with bulb commonly used, described control circuit mainly is made up of two stage power electronic component and sample resistance, described sample resistance is connected with bulb commonly used, and be connected across between the anode (or emitter stage) and the control utmost point (or base stage) of first order power electronic element, the anode of second level power electronic element (or emitter stage) connects positive source, its control utmost point (or base stage) connects the negative electrode (or colelctor electrode) of first order power electronic element, and the negative electrode of two stage power electronic component (or colelctor electrode) is ground connection all.

Under normal operation, electric current constitutes the loop through sample resistance and bulb commonly used, and bulb commonly used is luminous.At this moment, the dividing potential drop at sample resistance two ends makes first utmost point power electronic element conducting, thereby makes second level power electronic element be in cut-off state, and spare bulb and alarm element can not get electric work; But when primary light bubbles out after existing fault can not switch on, the dividing potential drop at sample resistance two ends reduces to zero, first utmost point power electronic element becomes cut-off state as a result, second level power electronic element conducting, thus make spare bulb and alarm element get electric work, whole automatic bulb changer enable automatically spare bulb replacing damaged bulb commonly used in, pass through sound and light alarm, remind human pilot, change bulb commonly used in due course, the signals of vehicles indicator lamp is restored to the original state.Like this, need not to stop immediately troubleshooting, can not delay operate as normal.

Advantage of the present utility model is: circuit is simple and direct, element is few, cost is low, and volume is little, in light weight, contactless, noiseless, and stable performance, reliable, not only economical, but also practical.

Below in conjunction with accompanying drawing technical solution of the present utility model is described further.

Fig. 1 is 1: 1 a outline drawing of an embodiment of the utility model.

Fig. 2 is the circuit diagram of Fig. 1 embodiment.

Fig. 3 is the circuit diagram of another embodiment of the utility model.

Automatic bulb changer illustrated in figures 1 and 2 mainly is made up of bulb XD1 commonly used, LED, spare bulb XD2 and control circuit, described control circuit is made of triode T1, T2 and resistance R 1, R2, its annexation is: sample resistance R1 connects with bulb XD1 commonly used, and be connected across between the emitter stage and base stage of first order triode T1, the colelctor electrode of triode T1 is through loop resistance R2 ground connection, the emitter stage of triode T2 connects positive source, its base stage connects the colelctor electrode of triode T1, and its colelctor electrode is through spare bulb XD2 ground connection.

Under the normal condition, the dividing potential drop at sample resistance R1 two ends makes the generation of triode T1 by the base stage bias current of emitter stage to base stage, and T1 is switched on.Loop resistance R2 has limited the growth of T1 saturation current on the one hand, and the voltage that B is ordered is almost suitable with the A point, and this moment, triode T2 can not produce the base stage bias current, thereby was in cut-off state.Spare bulb XD2 all can not get electroluminescence with the diode that plays the warning effect.In case XD1 damages, the R1 no current passes through, dividing potential drop disappears, T1 becomes cut-off state by conducting state immediately, so the current potential that B is ordered descends, the A point occurs becoming the saturation conduction state by original cut-off state rapidly by the electric current of T2 emitter stage to base stage, occur the principal current through T2, XD2 and LED in the control circuit, spare bulb XD2 and LED all get electroluminescence as a result.Because the pressure drop that this circuit produces is far below the fluctuation range of vehicle power supply voltage, therefore to almost not influence of bulb brightness.

Embodiment illustrated in fig. 3 is that second utmost point power electronic element is IGCT SCR with the main variation of Fig. 2 relatively, between the control utmost point of this IGCT and anode and negative electrode respectively and meet divider resistance R2 and R4, in addition, by the resistance R 4 and and be connected to capacitor C.The operation principle of this embodiment circuit is similar to Fig. 2, has only XD1 luminous under the normal condition, has only when XD1 damages, triode T1 ends because of losing the base stage bias current, so the B point produces trigger voltage, makes IGCT SCR conducting, XD2 substitutes the luminous work of XD1, simultaneously the luminous warning of LED.In this process, capacitor C can prevent SCR by the false triggering conducting, thereby guarantees automatic bulb changer reliable operation.

Application of the present utility model is not limited to above embodiment, also can be applicable to locate signalling light for vehicle other light fixtures in addition, for example navigation light, railway signal lamp or the like.

Claims

1. automatic bulb changer, comprise bulb commonly used and alarm element, it is characterized in that also comprising spare bulb and control circuit, described alarm element is in parallel with spare bulb, in parallel by control circuit again with bulb commonly used, described control circuit mainly is made up of two stage power electronic component and sample resistance, described sample resistance is connected with bulb commonly used, and be connected across between the anode or emitter stage and the control utmost point or base stage of first order power electronic element, the anode or the emitter stage of second level power electronic element connect positive source, its control utmost point or base stage connect the negative electrode or the colelctor electrode of first order power electronic element, the equal ground connection of the negative electrode of two stage power electronic component or colelctor electrode.

2. automatic bulb changer according to claim 1 is characterized in that: described the two poles of the earth power electronic element is triode.

3. automatic bulb changer according to claim 1 is characterized in that: described power electronic element first is triode very, second IGCT very, between the control utmost point of described IGCT and anode and the negative electrode respectively and connect divider resistance.

4. automatic bulb changer according to claim 3 is characterized in that: described divider resistance side also is connected to electric capacity.