CN1100831A - Contactless electronic hooter for DLA series automobiles - Google Patents

Abstract

The DLA series contactless electronic hooter for automobile use has features of long working life, good effect, stable performance, simple structure and low cost, its circuit is optimized, electronic components are selected easily, fabrication is simple, the sound quality and sound level will not change after once adjustment.

Description

Contactless electronic hooter for DLA series automobiles

The invention belongs to the automobile electrical loudspeaker.

In prior art, general electric automobile horn, the ubiquity mission life is short, the weakness that service efficiency is low.This electric horn adopts without exception traditional contact structure, and its pronunciation is to reach by being fixed on the sympathetic response of back and forth movement by the sympathetic response sheet under the effect of electromagnetic field of linking iron on the diaphragm.And the electric current of field winding is provided, be contact holder and be connected the pulse current that the mutual percussion of iron phase produces the contact folding.Therefore, contact holder is easy to generate wearing and tearing and fracture in this frequent motion.Add former design the time consider diaphragm when vibrations ambient pressure to the influence of tonequality, so 2 to 3 air-vents are set at the loudspeaker inner chamber.These holes are in the motion of automobile, particularly comparing under the rugged environment, constantly sucking extraneous water, gas, ash (cigarette) dirt and silt, to making the contact in use for some time, cause loose contact and produce flashover, even sintering, adhesion and burn coil.Even this loudspeaker are at working environment preferably under the situation, also because of when work because folding is shaken with the frequency of per second 300-500 time in the contact, under the effect of horn coil self-induction electromotive force, the moment that the contact disconnects, the self induction voltage that produces up to tens to several hectovolts, it is lonely to cause that the contact produces electricity, causes and burns.So, the present electric horn that uses, general work a period of time just begins to damage, and changes voice and scraps.

Purpose of the present invention provides a kind of novel durable, and is simple in structure, and the DLA series contactless electronic loudspeaker that result of use is good is replaced prior art.This loudspeaker power supply divides positive-negative polarity, is 12 volts, 24 volts two kinds of voltage standards, in installing and using, conforms to power supply, voltage, the polarity of vehicle as long as note power supply, voltage, the polarity of loudspeaker, does not then have other specific (special) requirements again.Structure of the present invention is to have cancelled contact and upper and lower contact support, insulating part, the relevant securing member with other of electric capacity, adjusting gear etc. at the electric horn inner chamber of prior art, has only kept coil, has replaced contact structure with electronic structure.Its circuit adopts mu balanced circuit, integrated multi-resonant oscillating circuit, power switch circuit and electric source filter circuit to form (accompanying drawing).

Above-mentioned technology is applicable to various vehicle electric horns.

Existing accompanying drawings embodiments of the invention

The front has been stated the present invention and has been adopted mu balanced circuit, integrated multi-resonant oscillating circuit, and power switch circuit and electric source filter circuit are formed.Mu balanced circuit is made up of voltage stabilizing diode D1, current-limiting resistance R1; effect is to utilize the stabilizing voltage characteristic of voltage stabilizing diode to stablize the operating voltage of multi-resonant oscillating circuit; make oscillation frequency reliable and stable; also utilized the forward conduction characteristic of voltage stabilizing diode in addition; form anti-reverse holding circuit with R1; when the power supply reversal connection; the voltage of the whole oscillatory circuit voltage stabilizing diode of will directly flowing through smoothly is carried on the R1; make whole oscillator be in no-voltage condition substantially, prevented to damage because of the power supply reversal connection causes integrated circuit.Multi-resonant oscillating circuit is made up of elements such as integrated circuit, R2, R4, D2, C3, utilizes R2 can adjust the wide coefficient of accounting for of oscillator signal.The switching signal output that is provided by integrated circuit promotes power switch circuit.Power switch circuit is made up of elements such as R3, BG, field winding L.The switching signal that multi-resonant oscillating circuit produces, by R3 input BG base stage, the BG collector obtains amplifying several thousand times switching current, and the electric current field winding L that flows through drives loudspeaker and is connected iron and reaches the vibrations sounding.Thereby finished the purpose that whole non-contact circuit will reach.Electric source filter circuit is made up of capacitor C 1 and C2.The pulse current that its effect produces when being the generating of filtering automobile current generator is to the influence of loudspeaker tonequality.Because BG adopts compound transistor, the diode of interior setting has been eliminated the inverse peak voltage of L, guarantee transistor not the reason inverse peak voltage cause damage.In sum, the present invention compared with the prior art has following four evident characteristics:

1, once debugging can not changed voice for a long time, be modified tone.After the present invention replaced traditional contact structure, because circuit has been selected stable square wave frequency for use, loudspeaker were connected the iron gap up and down after factory's debugging locking, and its tonequality is never changed voice, modified tone under long-term the use.

2, result of use is good.As the about 2 years DLA-1-12A type contactless electronic loudspeaker on probation of getting on the bus, its operating voltage is rated for 12 volts, reduces to 10 volts or rise to 15 volts but work as voltage, and excitation voltage is failure of oscillation not still, and tonequality and sound level still meet national standard.

3, long working life.Owing to adopt the compound high power transistor of anti-reverse holding circuit, mu balanced circuit and the built-in peak damper diode that disappears, thereby protected entire circuit effectively.

4, simple in structure, cheap.The present invention adds the circuit simple optimizing because prior art has been cut down numerous and diverse machined piece in large quantities, and electronic component selects easily, thereby simplifies the structure, and has reduced cost.

Claims (1)

1. A kind of automobile DLA series contactless electronic loudspeaker; it changes the contactless electron structure into by the electric horn of traditional contact structure; feature of the present invention is that its circuit is by mu balanced circuit; integrated multi-resonant oscillating circuit; power switch circuit and electric source filter circuit are formed; mu balanced circuit is by voltage stabilizing diode D1; current-limiting resistance R1 forms; effect is to utilize stabilizing voltage characteristic to stablize the operating voltage of multi-resonant oscillating circuit; make oscillation frequency reliable and stable; also utilized the forward conduction characteristic of voltage stabilizing diode in addition; form anti-reverse holding circuit with R1; when the power supply reversal connection; the power supply of the whole oscillatory circuit diode of will directly flowing through smoothly is carried on the R1; make whole oscillator be in no-voltage condition substantially; prevented to damage because of the power supply reversal connection causes integrated circuit; multi-resonant oscillating circuit is by integrated circuit; R2; R4; D2; elements such as C3 are formed; utilize R2 can adjust the wide coefficient of accounting for of oscillator signal; the switching signal output that is provided by integrated circuit promotes power switch circuit; power switch circuit is by R3; elements such as R4 field winding L are formed; the switching signal that multi-resonant oscillating circuit produces; by R3 input BG base stage; the BG collector obtains amplifying several thousand times switching current; the electric current field winding L that flows through; driving loudspeaker is connected iron and reaches the vibrations sounding; electric source filter circuit is made up of capacitor C 1 and C2; the pulse current that its effect produces when being the generating of filtering automobile current generator causes the influence to loudspeaker tonequality; because BG adopts compound transistor; the diode that is provided with in the pipe has been eliminated the inverse peak voltage of L, guarantee transistor not the reason inverse peak voltage cause damage.

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