CN115314808A

CN115314808A - Loudspeaker power overload indicating device

Info

Publication number: CN115314808A
Application number: CN202211051293.7A
Authority: CN
Inventors: 周洪; 朱小田; 陈家承
Original assignee: Shenzhen Maono Technology Co ltd
Current assignee: Shenzhen Maono Technology Co ltd
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2022-11-08

Abstract

The invention discloses a horn power overload indicating device, and relates to the technical field of power overload indication. This loudspeaker power overload indicating device, including basin frame, magnificent department and T iron, permanent magnet has been cup jointed on the surface of T iron, magnificent department fixed connection is on permanent magnet's surface, the magnificent department is upwards run through to T iron, magnificent department fixed connection is on the surface of basin frame, the inside of basin frame is provided with the sliding sleeve through the sound basin. According to the invention, by arranging the sampling voice coil and the overload indicating component, when the loudspeaker unit runs in an overload state, the sampling voice coil can cut a large amount of magnetic lines between the T iron and the washer, so that a large induction voltage is generated, the voltage is input to the overload indicating component through a wire, the overload indicating component can indicate that the loudspeaker unit is overloaded, and the overload indicating component is integrally arranged on the loudspeaker unit, so that the loudspeaker can conveniently research and develop from a finished product, debug in a system, and monitor whether the loudspeaker is overloaded in real time in daily use, thereby prolonging the service life of the loudspeaker.

Description

Loudspeaker power overload indicating device

Technical Field

The invention relates to the technical field of power overload indication, in particular to a horn power overload indicating device.

Background

The technical progress of the loudspeaker adds much fun to the spiritual life of human beings, and people can enjoy various wonderful sounds in the world. The music program can be experienced in various open air places, cinemas and even families, and brings people with shock. Generally, the high-power speaker equipment divides the speaker units into ultra-bass units, mid-bass units, treble units and other categories according to different working frequency bands. In the units, the subwoofer unit and the bass unit are most easily damaged, and in the use process of the sound box, as the human ear is not sensitive to the loudness and distortion of the low frequency band in the sound signal, most users (including system debugger) can make the volume of the subwoofer larger to obtain enough shock, and at the moment, the subwoofer unit is seriously overloaded, but the users do not know the volume; the output power of most of the ultra-bass amplifiers has no redundancy (cost limitation), when the output of the amplifier is improved by a user, when the output of the amplifier exceeds the rated power of the amplifier, a distortion signal is inevitably output, the signal is specifically shown as topping, the signal contains high-voltage direct-current components and a large number of higher harmonics, the signal is called a loudspeaker killer, in the topping period of signal duration, a loudspeaker unit stops vibrating, most of energy generated by the high-voltage direct-current voltage flowing through a voice coil is heat energy, and the loudspeaker can be subjected to irreversible physical characteristic change and even burnt out after a long time.

Among the prior art, common loudspeaker unit has caused loudspeaker to be difficult to in product research and development, system debugging owing to lack corresponding overload monitoring devices to and whether the overload condition appears in daily use judgement, can lead to loudspeaker to damage in advance, shorten life.

Disclosure of Invention

Solves the technical problem

Aiming at the defects of the prior art, the invention provides a loudspeaker power overload indicating device, which solves the problems that a loudspeaker is difficult to develop and debug products and judge whether overload occurs or not in daily use due to the fact that a common loudspeaker unit is lack of a corresponding overload monitoring device, the loudspeaker is possibly damaged in advance, and the service life is shortened.

Technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a loudspeaker power overload indicating device comprises a basin frame, a washer and T iron, wherein a permanent magnet is sleeved on the surface of the T iron, the washer is fixedly connected to the surface of the permanent magnet, the T iron upwards penetrates through the washer, the washer is fixedly connected to the surface of the basin frame, a sliding sleeve is arranged inside the basin frame through a sound basin, and a loudspeaker voice coil is wound on the surface of the sliding sleeve;

the fixed surface of sound basin is connected with dustproof cap, the surface of sliding sleeve still twines the sampling voice coil loudspeaker voice coil, the sampling voice coil loudspeaker voice coil is provided with the overload indicating part of fixing in dustproof cap inside through the wire.

Furthermore, the overload indicating component comprises a signal conversion module, an indicating driving module and a reference signal module, wherein the input end of the signal conversion module is electrically connected with the sampling voice coil and is used for converting an alternating current signal generated by cutting the magnetic induction line by the sampling voice coil into a direct current signal and transmitting the direct current signal to the indicating driving module, the reference information module is used for generating a reference signal corresponding to the rated bearing power of the loudspeaker and is connected with the indicating driving module, and the indicating driving module is used for indicating when the power of the loudspeaker is overloaded.

Furthermore, the signal conversion module comprises diodes D1-D4, one end of the sampling voice coil is respectively connected with the anode of the diode D1 and the cathode of the diode D3, and the other end of the diode D3 is grounded;

the other end of the sampling voice coil is respectively connected with the anode of the diode D2 and the cathode of the diode D4, and the other end of the diode D4 is grounded;

and the cathode of the diode D1 and the cathode of the diode D2 are both connected with the indication driving module.

Further, the cathode of the diode D1 and the cathode of the diode D2 are all grounded through the filter capacitor C1, the cathode of the diode D2, and the non-grounded end of the filter capacitor C1 are all connected to the load resistor R1, and the other end of the load resistor R1 is grounded.

Further, it includes luminous LED to instruct drive module, load resistance R2, load resistance R3, triode Q1 and triode Q2, luminous LED's positive pole is connected with signal conversion module's output, luminous LED's negative pole is connected with load resistance R2's one end and triode Q2's projecting pole respectively, triode Q2's base is connected with load resistance R2's the other end and triode Q1's projecting pole respectively, triode Q2's collecting electrode is connected with triode Q1's base and load resistance's one end respectively, load resistance R3's the other end ground connection, triode Q1's collecting electrode and reference signal module are connected.

Further, the reference signal module includes a filter capacitor C2, a zener diode U1, a load resistor R4 and a variable resistor VR1, one end of the filter capacitor C2 is connected to the indication driving module, a first cathode of the zener diode U1 and a first fixed end of the variable resistor VR1, respectively, and the other end of the filter capacitor C2 is grounded;

the second cathode of the zener diode U1 is grounded, the anode of the zener diode U1 is connected to the second fixed end of the variable resistor VR1, the variable resistance end of the variable resistor VR1 and one end of the load resistor R4, respectively, and the other end of the load resistor R4 is grounded.

Further, the reference signal generated by the reference information module is a voltage value V _REF The following formula is used to obtain:

further, the light-emitting LED inputs the driving current I provided by the signal conversion module, and is obtained by the following formula:

wherein, V _BE Is the emitter junction voltage of the transistor Q2.

Furthermore, the sampling voice coil adopts an enameled copper wire with the diameter of about 0.2mm, and the number of turns is 3-5.

Further, the center position of the dustproof cap is subjected to transparent treatment.

Advantageous effects

The invention has the following beneficial effects:

when loudspeaker unit transships when moving, the sampling voice coil loudspeaker voice coil can cut a large amount of magnetic lines of force between T iron and the china department to produce great induced voltage, this voltage is imported to overload indicating part through the wire, indicate loudspeaker unit overload through overload indicating part, overload indicating part is integrated to be set up on loudspeaker unit, the loudspeaker of being convenient for are from finished product research and development, the system debugging, and whether real-time supervision transships in daily use, thereby loudspeaker's life has been increased.

Of course, it is not necessary for any product to practice the invention to achieve all of the above-described advantages at the same time.

Drawings

FIG. 1 is a schematic view of the structure of the present invention;

fig. 2 is a circuit configuration diagram of an overload indicating means of the present invention.

In the figure, 1, a basin stand; 2. t iron; 3. a permanent magnet; 4. washer; 5. a sound basin; 6. a sliding sleeve; 7. a horn voice coil; 8. a dust cap; 9. the voice coil is sampled.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.

Referring to fig. 1-2, an embodiment of the present invention provides a technical solution: a horn power overload indicating device comprises a basin frame 1, a washer 4 and a T iron 2, wherein a permanent magnet 3 is sleeved on the surface of the T iron 2, the washer 4 is fixedly connected to the surface of the permanent magnet 3, the T iron 2 upwards penetrates through the washer 4, the washer 4 is fixedly connected to the surface of the basin frame 1, a sliding sleeve 6 is arranged in the basin frame 1 through a sound basin 5, and a horn voice coil 7 is wound on the surface of the sliding sleeve 6;

the fixed surface of sound basin 5 is connected with dust cap 8, the surface of sliding sleeve 6 has still twined sampling voice coil 9, sampling voice coil 9 is provided with the overload indicating part who fixes at dust cap 8 inside through the wire.

Specifically, the overload indicating component comprises a signal conversion module, an indicating driving module and a reference signal module, wherein the input end of the signal conversion module is electrically connected with the sampling voice coil 9 and used for converting an alternating current signal generated by cutting a magnetic induction line by the sampling voice coil 9 into a direct current signal and transmitting the direct current signal to the indicating driving module, the reference information module is used for generating a reference signal corresponding to the rated bearing power of the loudspeaker and is connected with the indicating driving module, and the indicating driving module is used for indicating when the power of the loudspeaker is overloaded.

In this embodiment, when the speaker is overloaded, the large-amplitude movement of the cone 5 causes the sampling voice coil 9 to cut a large amount of magnetic lines between the T-iron 2 and the washer 4 to generate a large induced voltage, which is converted into a dc voltage by the signal conversion module through the lead-out wire to provide a power supply for the indication driving module and the reference signal module, which is actually an adjustable precise dc voltage source responsible for generating a reference signal, i.e., a fixed voltage value, corresponding to the rated power of the speaker.

Specifically, the signal conversion module includes diodes D1-D4, one end of the sampling voice coil 9 is connected to the anode of the diode D1 and the cathode of the diode D3, respectively, and the other end of the diode D3 is grounded;

the other end of the sampling voice coil 9 is respectively connected with the anode of the diode D2 and the cathode of the diode D4, and the other end of the diode D4 is grounded;

the cathode of the diode D1 and the cathode of the diode D2 are both connected with the indication driving module;

the cathode of the diode D1 and the cathode of the diode D2 are grounded through the filter capacitor C1, the cathode of the diode D2 and the non-grounded end of the filter capacitor C1 are connected with the load resistor R1, and the other end of the load resistor R1 is grounded.

In the embodiment, D1-D4 form a bridge rectifier, which is used for rectifying an alternating current signal into a direct current signal, and C1 is a filter capacitor and is responsible for smoothing rectified pulse direct current voltage; r1 is a load resistor, the resistance value of the load resistor is large, and the load resistor mainly has the function of discharging residual direct current voltage on C1 so that the voltage on C1 is restored to a normal range after an overload signal disappears.

Specifically, the indication driving module comprises a light-emitting LED, a load resistor R2, a load resistor R3, a triode Q1 and a triode Q2, wherein an anode of the light-emitting LED is connected with an output end of the signal conversion module, a cathode of the light-emitting LED is respectively connected with one end of the load resistor R2 and an emitter of the triode Q2, a base of the triode Q2 is respectively connected with the other end of the load resistor R2 and an emitter of the triode Q1, a collector of the triode Q2 is respectively connected with a base of the triode Q1 and one end of the load resistor, the other end of the load resistor R3 is grounded, and a collector of the triode Q1 is connected with the reference signal module;

the light-emitting LED inputs a driving current I provided by a signal conversion module, and is obtained by the following formula:

wherein, V _BE Is the emitter junction voltage of the transistor Q2.

In this embodiment, the indication driving module is a constant current source composed of a load resistor R2, a load resistor R3, a transistor Q1 and a transistor Q2, and provides a driving circuit for the light emitting LED through

Can be obtained.

Specifically, the reference signal module includes a filter capacitor C2, a zener diode U1, a load resistor R4, and a variable resistor VR1, one end of the filter capacitor C2 is connected to the indication driving module, a first cathode of the zener diode U1, and a first fixed end of the variable resistor VR1, respectively, and the other end of the filter capacitor C2 is grounded;

a second cathode of the voltage stabilizing diode U1 is grounded, an anode of the voltage stabilizing diode U1 is connected to a second fixed end of the variable resistor VR1, a variable resistance end of the variable resistor VR1 and one end of the load resistor R4, respectively, and the other end of the load resistor R4 is grounded;

the reference signal generated by the reference information module is a voltage value V _REF The following formula is used to obtain:

in this embodiment, the reference signal module is responsible for generating a reference signal, i.e. a fixed voltage value, which corresponds to the rated power of the speaker, and the values of the speakers with different powers are different, so that in order to adapt to the speakers with various powers, VR1 is used to adjust the reference voltage value; c2 is responsible for filtering, and has the effect of stabilizing reference voltage

Can find V _REF 。

Specifically, the center of the dust cap 8 is processed transparently.

In this embodiment, the central position of the dust cap 8 is transparent, so that the luminous LED can be conveniently observed, and the horn overload can be conveniently found.

The working principle is as follows: when the loudspeaker unit normally works, the cone 5 can generate up-and-down reciprocating piston motion under the drive of audio current, so that the sliding sleeve 6 can be driven to move, the voice coil adopted on the sliding sleeve 6 is not in a linear area of a magnetic field at the moment, the sampling voice coil 9 only cuts a small amount of magnetic lines between the T iron 2 and the washer 4 to generate smaller induction voltage, when the loudspeaker works in an overload mode, the large-amplitude motion of the cone 5 causes the sampling voice coil 9 to cut a large amount of magnetic lines between the T iron 2 and the washer 4 to generate larger induction voltage, and the voltage is connected to a circuit board through a lead-out wire to complete the transmission of sampling signals;

the signal of the sampling voice coil 9 is an alternating current signal, which can completely reflect the power bearing state of the loudspeaker, when the loudspeaker works normally, the amplitude of the signal is in a safe range, when the loudspeaker bears excessive power, the output can exceed the normal safe range, and the signal is basically linear, and can faithfully reflect the actual power bearing state of the loudspeaker, the alternating current signal reflecting the working state of the loudspeaker is transmitted to the signal conversion module through a lead-out wire, D1-D4 in the signal conversion module form a bridge rectifier to rectify the alternating current signal into a direct current signal, the filter capacitor C1 is responsible for smoothing the rectified pulse direct current voltage, R1 is a load resistor, the resistance value is large, and the main function is to discharge the residual direct current voltage on C1, so that the voltage on C1 is restored to the normal range after the overload signal disappears;

the reference signal module is actually an adjustable precise direct-current voltage source and is responsible for generating a reference signal, namely a fixed voltage value, which corresponds to the rated bearing power of the loudspeaker, and the values of the loudspeakers with different powers are different, so that in order to adapt to the loudspeakers with various powers, VR1 is used for adjusting the reference voltage value; c2 is responsible for filtering, plays the effect of stable reference voltage, wherein zener diode U1 is the assembly of two stabilivolt, contain two stabilivolt of series connection in the intraductal, have the function of temperature compensation, and reference voltage sets up to V _REF Can pass through

Obtaining;

the indication driving module comprises a load resistor R2, a load resistor R3, a triode Q1 and a triode Q2 which form a constant current source, a light-emitting LED provides a driving current I, and the constant current source is connected with a power supply through a power supply line

Obtaining V _BE Is the emitter junction voltage of the triode Q2;

the signal conversion module indicates that the driving module and the reference signal module are in a series connection relation, when the power borne by the loudspeaker is overlarge, the alternating current signal voltage output by the sampling voice coil 9 can exceed a normal value and is converted into direct current voltage (two ends of C1) through the signal conversion module, and when the voltage is higher than the sum of the luminous LED voltage drop, the reference voltage and the emitting junction voltage of Q2, namely V>V _LED +V _REF +V _BE The light-emitting LED is lighted up,

at the moment, the LED is lightened to display that the loudspeaker is in an overload state, after the overload state is relieved, the voltage at the two ends of the C1 is released to a normal range by the R1, the LED does not have current to pass, so the LED is extinguished, and the loudspeaker is not overloaded at the moment.

Wherein V _LED The forward working voltage of the red LED is generally a constant of 1.8V; v _BE The emitter junction voltage of a common silicon triode is generally constant 0.6V; v _REF The value is a value obtained by jointly debugging the actual power of the loudspeaker and the actual turn number of the sampling voice coil, and is generally 2.5-5V; the current of the constant current source is determined according to the actual brightness of the LED, and when the red high-brightness LED is used, a constant of 2mA can be taken, and at the moment, the luminous LED has enough brightness, so that the power consumption is in an optimal range.

When the loudspeaker is in use and in a rated state, the loudspeaker is in a high-impedance state, and the overload circuit hardly consumes current; the overload state of the loudspeaker can be displayed through a red LED in real time, the loudspeaker with different power can be matched by adjusting the value of the reference signal module, and the display response time can be matched by adjusting the time constant of the signal conversion module.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a loudspeaker power overload indicating device, includes basin frame (1), china department (4) and T iron (2), its characterized in that: the surface of the T iron (2) is sleeved with a permanent magnet (3), the washer (4) is fixedly connected to the surface of the permanent magnet (3), the T iron (2) upwards penetrates through the washer (4), the washer (4) is fixedly connected to the surface of the basin frame (1), a sliding sleeve (6) is arranged inside the basin frame (1) through a sound basin (5), and a loudspeaker voice coil (7) is wound on the surface of the sliding sleeve (6);

the surface fixed connection of sound basin (5) has dust cap (8), the surface of sliding sleeve (6) has still twined sampling voice coil loudspeaker voice coil (9), sampling voice coil loudspeaker voice coil (9) are provided with the overload indicating part of fixing in dust cap (8) inside through the wire.

2. A horn power overload indicator apparatus as claimed in claim 1, wherein: the overload indicating component comprises a signal conversion module, an indicating driving module and a reference signal module, wherein the input end of the signal conversion module is electrically connected with the sampling voice coil (9) and used for converting an alternating current signal generated by cutting a magnetic induction line of the sampling voice coil (9) into a direct current signal and transmitting the direct current signal to the indicating driving module, the reference information module is used for generating a reference signal corresponding to the rated bearing power of the loudspeaker and is connected with the indicating driving module, and the indicating driving module is used for indicating when the power of the loudspeaker is overloaded.

3. A horn power overload indicator apparatus as claimed in claim 2, wherein: the signal conversion module comprises diodes D1-D4, one end of the sampling voice coil (9) is respectively connected with the anode of the diode D1 and the cathode of the diode D3, and the other end of the diode D3 is grounded;

the other end of the sampling voice coil (9) is respectively connected with the anode of the diode D2 and the cathode of the diode D4, and the other end of the diode D4 is grounded;

4. A horn power overload indicator as claimed in claim 3, wherein: the cathode of the diode D1 and the cathode of the diode D2 are grounded through the filter capacitor C1, the cathode of the diode D2 and the non-grounded end of the filter capacitor C1 are connected with the load resistor R1, and the other end of the load resistor R1 is grounded.

5. A horn power overload indicator as claimed in claim 2, wherein: indicate drive module including luminous LED, load resistance R2, load resistance R3, triode Q1 and triode Q2, luminous LED's positive pole is connected with signal conversion module's output, luminous LED's negative pole is connected with load resistance R2's one end and triode Q2's projecting pole respectively, triode Q2's base is connected with load resistance R2's the other end and triode Q1's projecting pole respectively, triode Q2's collecting electrode is connected with triode Q1's base and load resistance's one end respectively, load resistance R3's other end ground connection, triode Q1's collecting electrode and reference signal module are connected.

6. A horn power overload indicator as claimed in claim 2, wherein: the reference signal module comprises a filter capacitor C2, a voltage stabilizing diode U1, a load resistor R4 and a variable resistor VR1, one end of the filter capacitor C2 is respectively connected with the indication driving module, a first cathode of the voltage stabilizing diode U1 and a first fixed end of the variable resistor VR1, and the other end of the filter capacitor C2 is grounded;

the second cathode of the zener diode U1 is grounded, the anode of the zener diode U1 is connected to the second fixed end of the variable resistor VR1, the variable resistance end of the variable resistor VR1, and one end of the load resistor R4, respectively, and the other end of the load resistor R4 is grounded.

7. A horn power overload indicator apparatus as claimed in claim 2, wherein: the reference signal generated by the reference information module is a voltage value V _REF The following formula is used to obtain:

8. a horn power overload indicator as claimed in claim 5, wherein: the light-emitting LED inputs a driving current I provided by a signal conversion module, and is obtained by the following formula:

wherein, V _BE Is the emitter junction voltage of the transistor Q2.

9. A horn power overload indicator as claimed in claim 1, wherein: the sampling voice coil (9) adopts an enameled copper wire with the diameter of about 0.2mm, and the number of turns is 3-5.

10. A horn power overload indicator as claimed in claim 1, wherein: and the center of the dustproof cap (8) is subjected to transparent treatment.