CN203931487U - A kind of harmonious electric automobile horn of electromagnetic compatibility - Google Patents

Abstract

The utility model discloses a kind of harmonious electric automobile horn of electromagnetic compatibility, comprise horn chassis parts, diaphragm parts, field effect transistor, pcb board, power supply positive and negative terminal on described pcb board is connected with capacitor, described field effect transistor and capacitor divide the two ends that are arranged at pcb board, and the two axes intersect angle △ of described field effect transistor and capacitor is 25 ° ± 15 °.The utility model has reached provides a kind of simple in structure, easy to process, and the object of the harmonious electric automobile horn of the lower a kind of electromagnetic compatibility of cost of manufacture.Realized parts few, versatility is good, and Installation and Debugging are convenient, can meet the standard-required of electromagnetic interference (EMI).

Description

A kind of harmonious electric automobile horn of electromagnetic compatibility

Technical field

The utility model belongs to motor vehicle apparatus field, relates to a kind of electric horn of motor vehicle, relates in particular to a kind of harmonious electric automobile horn of electromagnetic compatibility.

Background technology

Along with the development of electronic product on automobile, the requirement of the Electro Magnetic Compatibility index of its electronic product is more and more higher.This is not only related to the quality of properties of product, directly has influence on the safety of driving simultaneously.Therefore, as automobile electromechanical type electric horn, its electronic control circuit, although overcome the electromagnetic interference (EMI) that orthodox car electric horn produces other parts, by international standard test, self but cannot reach the ability of anti-electromagnetic interference (EMI).As China Patent No.: ZL201220214851.2, the day for announcing: on Dec 05th, 2012, utility model title: < < harmonious electric automobile horn > >, its technological means adopting is that coil one end connects positive contact and stationary contact spot film, the C utmost point of other end connecting triode, the B of triode extremely in parallel release diode and the triode of releasing, after parallel connection, be further divided into two tunnels, one passes by resistance first is connected with movable contact spot film, the resistance second of separately leading up to connects negative contacts, the E utmost point of triode is extremely all connected with negative contacts with the E of the triode of releasing.Although this loudspeaker have adopted the leadage circuit being comprised of the diode of releasing, the triode of releasing, resistance second, released when triode ends, in coil, produce powerful reverse self-induction electromotive force, the vibration frequency of loudspeaker is synchronizeed with the natural frequency of loudspeaker machinery sonification system, vibration is without noise, produce harmonious acoustics, though voltage 60% on a large scale in when fluctuation, the fluctuation of frequency is also only in 1%; But in Conduction Interference test, this loudspeaker appear at some frequency band sound and sharply diminish, and can not meet the requirement of electromagnetic interference (EMI) standard in electromagnetic interference (EMI).

Utility model content

The purpose of this utility model is to overcome existing harmonious electric automobile horn can not meet electromagnetic interference (EMI) standard-required, in interference test, there is defect and deficiency that some frequency band sound sharply diminishes, provide a kind of simple in structure, easy to process, and the harmonious electric automobile horn of the lower a kind of electromagnetic compatibility of cost of manufacture.Its parts are few, and versatility is good, and Installation and Debugging are convenient, can meet the standard-required of electromagnetic interference (EMI).

For achieving the above object, the technical solution adopted in the utility model is: a kind of harmonious electric automobile horn of electromagnetic compatibility, comprise horn chassis parts, diaphragm parts, field effect transistor, pcb board, it is characterized in that: the power supply positive and negative terminal on described pcb board is connected with capacitor, described field effect transistor and capacitor divide the two ends that are arranged at pcb board, and the two axes intersect angle △ of described field effect transistor and capacitor is 25 ° ± 15 °.

As preferably, described capacitor is electrochemical capacitor, and parameter is 63V, 47 μ F.

As preferably, described electrochemical capacitor is for there being polarity electrochemical capacitor.

Compared with prior art, the beneficial effects of the utility model are:

1. adopted the both ends of power on pcb board to be connected to electrochemical capacitor, and the be placed in two ends of pcb board of field effect transistor and capacitor, the two axes intersect angle △ of field effect transistor and capacitor is 25 ° ± 15 °, make to meet the standard-required of electromagnetic interference (EMI), meet again the requirement of practicality, in interference test, there will not be the defect and the deficiency that at some frequency band sound, sharply diminish;

2. electrochemical capacitor used is 63V, 47 μ F, make effective, cost is low;

3. electrochemical capacitor used is for there being polarity electrochemical capacitor, the cost reduction 30% of more nonpolarity electrochemical capacitor.

The utility model has reached provides a kind of simple in structure, easy to process, and the object of the harmonious electric automobile horn of the lower a kind of electromagnetic compatibility of cost of manufacture.Realized parts few, versatility is good, and Installation and Debugging are convenient, can meet the standard-required of electromagnetic interference (EMI).

Accompanying drawing explanation

Fig. 1: the partial structurtes schematic diagram that is the utility model embodiment;

Fig. 2: the circuit theory diagrams that are the utility model embodiment.

In figure: 1. field effect transistor, 2.PCB plate, 3. capacitor, △. the two axes intersect angle of field effect transistor and capacitor.

Embodiment

For the ease of those of ordinary skills, understand and enforcement the utility model, below in conjunction with drawings and Examples, the utility model is described in further detail, should be appreciated that exemplifying embodiment described herein is only for description and interpretation the utility model, and be not used in restriction the utility model.

The method of prevention electromagnetic interference (EMI) has multiple, more commonly filter method.At both ends of power shunt capacitance wave filter.Wave filter can reduce the level of Conducted Electromagnetic Interference significantly.Because the frequency spectrum composition of electromagnetic interference (EMI) is not equal to the frequency of useful letter, the wave filter pair composition different from useful signal frequency has good inhibition ability, thereby play other precautionary measures, is difficult to the effect producing.

Yet electric automobile horn inner space is narrow and small, the both ends of power on pcb board 2 connects capacitor 3, and its position has many places to select.In order to dispel the heat, general field effect transistor 1 is the one end that is placed on pcb board 2.And the placement of capacitor 3, any position that can be on the plate face of pcb board 2.But, by the be placed in two ends of pcb board 2 of described field effect transistor 1 and capacitor 3, just both met functional requirement, met again the requirement of economy and practicality.In addition, the relative position of field effect transistor 1 and capacitor 3 also has the multiple scheme of putting, when field effect transistor 1 is 25 ° ± 15 ° with capacitor 3 the two axes intersect angle △, can make full use of the space of electric automobile horn inside, though can select volume a little bigger, but the electrochemical capacitor that price is lower, reaches the object that cost is low.Selected angle tolerance, looks after the needs of the big or small electric automobile horn of current various vehicle difference used.

Ask for an interview Fig. 1, the technical scheme that the utility model adopts is: a kind of harmonious electric automobile horn of electromagnetic compatibility, comprise horn chassis parts, diaphragm parts, field effect transistor 1, pcb board 2, power supply positive and negative terminal on pcb board 2 is connected with capacitor 3, field effect transistor 1 and capacitor are arranged at the two ends of pcb board 2 for 3 minutes, and field effect transistor 1 is 25 ° ± 15 ° with capacitor 3 the two axes intersect angle △.

Asking for an interview Fig. 2, is the circuit theory diagrams of the utility model embodiment, and the capacitor 3 of the positive and negative connection of power supply on the utility model pcb board 2 is for there being polarity electrochemical capacitor, and parameter is 63V, 47 μ F.

Loudspeaker the producer all know, in order to meet the requirement of electric automobile horn reliability, selecting the proof voltage value of electrochemical capacitor is to be the bigger the better.The high back voltage electromotive force being produced by electric automobile horn coil like this, can not damage electrochemical capacitor, causes electric automobile horn to lose efficacy, and generally has the proof voltage value of polarity electrochemical capacitor all more than 100V.But the proof voltage value of electrochemical capacitor is larger, and price is more expensive.Because the utility model has adopted the control of field effect transistor and the two axes intersect angle △ of capacitor, the radiating condition of electrochemical capacitor improves, and its proof voltage value also meets reliability requirement completely at 63V.

Theoretically, in order to meet the requirement of electromagnetic interference (EMI) standard, it is more wide better that the capacitance value of selection electrochemical capacitor can cover band limits.General reliable way is two Parallel-connected Capacitors that adopt small one and large one, more than the capacitance of two capacitors differs the order of magnitude, to obtain anti-electromagnetic interference (EMI) in larger frequency range.The utility model adopts 47 μ F capacitors, at the desired band limits of existing standard, reaches the requirement of electromagnetic interference (EMI) standard.

Capacitor 3 of the present utility model is the increases on harmonious electric automobile horn, and configuration between field effect transistor 1, pcb board 2, capacitor 3 etc., but be the improvement on harmonious electric automobile horn, and other parts are as horn chassis parts, diaphragm parts etc., all same as the prior art, do not repeat herein.

Although this instructions has more been used the terms such as horn chassis parts, diaphragm parts, field effect transistor 1, pcb board 2, capacitor 3, do not get rid of the possibility of using other terms.Use these terms to be only used to describe more easily essence of the present utility model, they are construed to any additional restriction is all contrary with the utility model spirit.

Should be understood that; the above-mentioned description for preferred embodiment is comparatively detailed; can not therefore think the restriction to the utility model scope of patent protection; those of ordinary skill in the art is under enlightenment of the present utility model; do not departing from the scope situation that the utility model claim protects; can also make and replacing or distortion, within all falling into protection domain of the present utility model, the scope of asking for protection of the present utility model should be as the criterion with claims.

Claims (3)

1. the harmonious electric automobile horn of an electromagnetic compatibility, comprise horn chassis parts, diaphragm parts, field effect transistor (1), pcb board (2), it is characterized in that: the power supply positive and negative terminal on described pcb board (2) is connected with capacitor (3), described field effect transistor (1) divides with capacitor (3) two ends that are arranged at pcb board (2), and described field effect transistor (1) is 25 ° ± 15 ° with the two axes intersect angle △ of capacitor (3).

2. the harmonious electric automobile horn of electromagnetic compatibility according to claim 1, is characterized in that: described capacitor (3) is electrochemical capacitor, and parameter is 63V, 47 μ F.

3. the harmonious electric automobile horn of electromagnetic compatibility according to claim 2, is characterized in that: described electrochemical capacitor is for there being polarity electrochemical capacitor.