CN2262246Y - Automatic detecting and warning device for vehicle lamp bulb - Google Patents

Abstract

The utility model relates to an alarm device, which can automatically detect the on-off of the filament of a bulb in a lighting system on a motor vehicle. The utility model is composed of a filament failure detection switching circuit, a threshold phase inverter, a relative acoustic-optic driving circuit, etc. No matter what state a switch of a vehicle lamp exists in, the utility model still can automatically detect the on-off of the filament of the lamp in any lighting system on motor vehicles. When a bulb goes wrong, the utility model can alarm with sound and light in time, and the position of the lamp which goes wrong can be shown.

Description

The automatic detection alarm device of motor vehicle bulb

The utility model relates to a kind of warning device that can detect light bulb filament break-make in the lighting system automatically, the warning device of light bulb filament break-make in the lighting system on particularly a kind of energy automatic detecting machine motor-car.

The essential condition that various lightings on the motor vehicles and indication mechanism are traffic safety, and various automobile-used bulb is the most flimsy part in this system because of being subjected to road top wave action.At present, the means of still not having practicable automatic detection bulb quality on the motor vehicles of the most of popular style of China.The light warning system is arranged in the high-grade car of import, but all unexposed schematic diagram of crossing on various commercially available auto repair data, can't be applied on the popular motor vehicle, and these light warning systems mostly can only detect when light is opened, if the vehicle driver opens indicator when turning, when receiving the report for police service signal (indicator is bad), vehicle has been in turn condition, at this moment very easily have an accident, or belong to the traffic violation.

The purpose of this utility model provides a kind of automatic detection alarm device of car light that can be used on the various popular vehicles, no matter whether the driver opens car light, as long as find to have filament disconnected, all can in time send sound, visual alarm, and clearly indicate the position of this trouble light system of living in makes the driver can be rapid, fix a breakdown in time, for safe driving provides safeguard.

Realize that the technical solution of the utility model is like this:

Headlight filament and transistor switching circuit are organically combined, utilize conducting that the through and off of filament come the oxide-semiconductor control transistors on-off circuit and end, thereby form filament failure detector switch circuit, remove to drive relevant sound, optical alarm circuit again.From the earth-free end of the car light diode that a forward connects of connecting into, or little resistance resistance is drawn a signal wire from this end again, by inserting the base stage of positive-negative-positive triode behind the resistance, the emitter of triode connects the 12V power positive end, forms a filament failure on-off circuit, when filament is intact, base stage by light bulb filament and positive-negative-positive triode constitutes the loop over the ground, and base potential is lower than emitter potential, and PNP manages conducting, the output noble potential, the collector of PNP pipe is by a current-limiting resistance.Insert an input end of managing the thresholding reverser of forming, make this thresholding phase inverter conducting, the output electronegative potential by 5.1V voltage stabilizing diode and NPN.Collector one termination at reverser has light emitting diode and buzzer drive circuit, does not at this moment all work because of electronegative potential.When filament disconnected, the base stage of PNP pipe was in vacant state, (or idiostatic with emitter-base bandgap grading), the PNP pipe ends, and Integrated electrode is an electronegative potential, and this moment, the thresholding phase inverter ended, the output noble potential also makes the light emitting diode conducting when triggering buzzer alarm circuit, played the effect of sound and light alarm.

The utility model circuit and structure are all simpler, the low installation of being convenient to popular motor vehicle of cost.Its effect is significantly, driver's last power-on of driving, and the utility model is promptly worked, no matter at this moment whether car light is opened, as long as filament one is disconnected, all can report to the police accuracy rate 100% at once.

Elaborate below in conjunction with embodiment and accompanying drawing.

Fig. 1 is the filament failure detection alarm device schematic diagram that the utility model uses clamp diode [1].

Fig. 2 is the utility model replaces clamp diode [1] with sample resistance [5] partial circuit figure.

Fig. 3 is the utility model with the panel synoptic diagram on the automatic detection alarm device of motor vehicle bulb.

Embodiment 1:

See Fig. 1, this is the electric former figure that detects a certain street lamp silk break-make in the automatic detection alarm device of the utility model and motor vehicle bulb, and it is by headlight filament fault detect on-off circuit, thresholding phase inverter, light emitting diode, hummer and driving switch circuit four parts thereof are formed.Clamp diode [1], PNP transistor switch triode [2], base resistance [3], collector resistance [4] is formed filament failure detector switch circuit with the filament of car light [14]; Voltage stabilizing diode [7], NPN transistor switch triode [8] and collector load resistor [6] thereof are formed the thresholding phase inverter; Light emitting diode [10] and current-limiting resistance [9] thereof are formed luminous display circuit; Hummer [12] is formed sound light alarming circuit with its NPN type driving switch triode [13], resistance [11].

Concrete principle of work is: the diode [1] with unilateal conduction characteristic is connected on the earth-free end of car light bulb [14], the A end of drawing on the base resistance [3] of a signal wire and PNP transistor switch triode [2] from this end links to each other again, and the filament of car light [14] just becomes the part of switching tube [2] base loop like this.Its principle that detects the filament break-make is: (1) is after lighting switch [15] closes, car light [14] energising work, at this moment if filament is intact, then there is electric current to flow through clamp diode [1], and the pressure drop of 0.5～0.7V arranged at its two end, because A point is to link to each other with the base stage of switching tube [2], thus the base potential of the switching tube of positive-negative-positive [2] than the low 0.5～0.7V of emitter current potential, base current through the filament of resistance [3], bulb [14] arrive the formation loop.Switching tube [2] conducting, noble potential about collector output 12V, after resistance [4] current limliting, the voltage stabilizing diode [7] in phase-reversing tube [8] base circuit of NPN type is punctured, phase-reversing tube [8] thereby conducting, collector output electronegative potential, sound, the light of coupled light emitting diode [10] and hummer all are failure to actuate.(2) when car light [14] energising work, but open filament, at this moment, flow through because of no current in the clamp diode [1], the voltage drop of 0.5～0.7V of its two end disappears thereupon, and the turn-on condition that closes pipe [2] also ends thereupon losing, and its current collection is electronegative potential very, being attached thereto the thresholding phase inverter [8] that connects also ends, the output noble potential, this noble potential makes also conducting of buzzer switch pipe [13] in conducting light emitting diode [10], hummer is rung, and sends sound, light alarm signal.(3) if lighting switch [15] does not close, bulb [14] filament is intact, then switching tube [2] base current is through base resistance [3], A-A point, filament forms path to ground, switching tube [2] conducting, output noble potential, make also conducting of thresholding phase-reversing tube [8], be output as electronegative potential, light emitting diode [10] all ends with buzzing switching tube [13], and noiseless, light is reported to the police.(4) if lighting switch [15] does not close, and the open filament of bulb [14], switching tube [2] is zero ending because of base current, the output noble potential, and light emitting diode is luminous because of the noble potential conducting, and hummer is rung, and sends sound, light warning.

Embodiment 2:

With the clamp diode [1] among the sample resistance among Fig. 2 [5] replacement Fig. 1, the B end of resistance [5] is held with the B among Fig. 1 and is linked to each other, and the A end links to each other with the A end.This circuit will become by the electric current that detects car light [14] filament loop to change whether come guide sound, optical alarm circuit work, and the principle of work of switch [15] when closing is identical among its principle of work and the embodiment 1.Sample resistance [5] span is determined by following formula: $R=\frac{0.5~0.7v}{I}$

In the formula, R is the resistance of resistance [5], and unit is ohm, and 0.5～0.7V is a certain value, unit is volt, I is the current value of bulb [14] when rated voltage (12V) is worked, and unit is ampere. replacing clamp diode among Fig. 1 [1] back circuit with sample resistance [5] has characteristics, promptly after change renews bulb, if used new bulb power is less than former bulb power, alarm also can be reported to the police, and principle is: suppose that former bulb power is 12W, presses following formula $R=\frac{0.5v}{I}=\frac{0.5v}{12w/12y}=0.5\mathrm{\Ω}$

Promptly when with the 12W bulb, under the voltage of 12V, its working current is 1A, and when flowing through 0.5 ohm sample resistance [5], its two end will just have the voltage of 0.5V to fall, switching tube [1] energy operate as normal, and sound, optical alarm circuit are not worked.If at this moment portable lamp is bad, change the bulb of 12V 10W after, at this moment working current is 0.83A.Sample resistance [5] still is 0.5 Ω, its two ends pressure drop V=0.5 * 0.83 ≈ 0.42V then, this voltage can not make switching tube [1] conducting, so switching tube [1] ends, and then phase-reversing tube [8] also ends, the output noble potential, and trigger buzzer switch [13] and light emitting diode [10] conducting, cause sound, light warning.This routine circuit can be used on the bulb power occasion that has certain requirements, as detection of brake lamp etc.In actual the use, the foregoing description 1 can mix use with the circuit of embodiment 2, is decided by concrete condition.The side circuit of this alarm is made up of a plurality of above-mentioned identical circuit, and hummer share one.Light emitting diode is respectively by demonstrating the light position at each self-corresponding monitored object place at the panel indicating window.The panel array that is used to detect the automatic detection alarm device of motor vehicle bulb is seen Fig. 3.Also can increase, subtract shown light quantity according to actual needs.

Claims (2)

1. the automatic detection alarm device of motor vehicle bulb comprises headlight filament fault detect on-off circuit, thresholding phase inverter, light emitting diode, hummer and driving circuit.It is characterized in that clamp diode [1] is connected on the earth-free end of car light [14], draw a signal wire and PNP transistor switch triode [2] from this end again, the A end of the resistance on the base stage [3] links to each other, with positive-negative-positive crystal switch triode [2], form a filament failure detector switch circuit together.

2. filament failure detector switch circuit as claimed in claim 1 is characterized in that the resistance span of sample resistance [5] is determined by following formula: $R=\frac{0.5-0.7V}{I}$

R is the sample resistance resistance in the formula, and unit is an ohm Ω, 0.5～0.7th, and definite value, unit is volt V, and I is the working current of car light [14] when rated operational voltage, and unit is an ampere A.

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