CN219843722U

CN219843722U - Control circuit and device of loudspeaker

Info

Publication number: CN219843722U
Application number: CN202321368011.6U
Authority: CN
Inventors: 彭志宇
Original assignee: Esd Acoustic Hangzhou Co ltd
Current assignee: Esd Acoustic Hangzhou Co ltd
Priority date: 2023-05-31
Filing date: 2023-05-31
Publication date: 2023-10-17
Anticipated expiration: 2033-05-31

Abstract

The utility model discloses a control circuit and a device of a loudspeaker, which relate to the field of circuits, wherein an amplifying module is connected with the loudspeaker to amplify an audio signal input to the loudspeaker, a rectifying module is connected with the amplifying module to convert the amplified audio signal into a direct current signal and output the direct current signal to a control end of a power electronic device, so that the power supply loop between a power supply module and an exciting coil is turned on and off by controlling the power electronic device to be turned on or off, the audio signal input to the loudspeaker is detected by matching the amplifying module and the rectifying module, and the power electronic device is controlled according to the detection condition of the audio signal, thereby realizing the automatic on-off of the loudspeaker. Compared with the control process of the AC power supply, the circuit has the advantages of simple structure, easy realization, no need of introducing complex devices such as a relay, a singlechip and the like, reduced device investment, reduced control cost, convenient use, high reliability, miniaturization, low cost, high reliability and the like.

Description

Control circuit and device of loudspeaker

Technical Field

The present utility model relates to the field of circuits, and in particular, to a control circuit and device for a speaker.

Background

With the wide application of the loudspeaker, the variety of the loudspeaker is more and more, compared with the working process of using permanent magnetism to generate a magnetic field of the traditional loudspeaker, the excitation type loudspeaker utilizes the cooperation of an excitation power supply and an excitation coil, and the magnetic field is generated by using an electromagnet, so that the problem that the excitation power supply consumes power and heats in the working process can exist, the excitation coil is actually an electromagnet, when direct current is introduced, a magnetic field is generated at two ends of a magnetic core of the excitation coil, the strength of the magnetic field is related to the current introduced into the coil, the resistance of the excitation coil is about tens of ohms generally, the current is about 1A generally, then the heat generated by the excitation loudspeaker which normally works at this time is quite large, and the power consumption is quite large, if a user forgets to turn off the excitation power supply, and potential safety hazards are generated seriously, so that the excitation loudspeaker is required to have an automatic on-off function, namely, when the loudspeaker does not play music, the excitation power supply supplied to the excitation coil of the loudspeaker can be automatically turned on when the music is played, so that the excitation power supply to the excitation coil of the loudspeaker is reduced.

In the prior art, in order to realize automatic on-off of a loudspeaker, an AC power supply of an excitation power supply is controlled, when the loudspeaker does not play music, an audio signal between the loudspeaker and a power amplifier circuit is detected by using a singlechip or other types of control circuits, then the AC power supply is controlled according to the detection condition of the audio signal, and the automatic on-off of the loudspeaker is realized by controlling whether the AC power supply supplies power or not. But this scheme needs to carry out direct control to the AC power, and more materials such as unavoidable throwing relay, throw-in device is many and with high costs, and control circuit is comparatively complicated, and the reliability is low.

Disclosure of Invention

The utility model aims to provide a control circuit and a device of a loudspeaker, which realize the detection of an audio signal input to the loudspeaker through the matching of an amplifying module and a rectifying module, and control a power electronic device according to the detection condition of the audio signal, thereby realizing the automatic on-off of the loudspeaker. Compared with the control process of the AC power supply, the circuit has the advantages of simple structure, easy realization, no need of introducing complex devices such as a relay, a singlechip and the like, reduced device investment, reduced control cost, convenient use, high reliability, miniaturization, low cost, high reliability and the like.

In order to solve the above technical problems, the present utility model provides a control circuit of a speaker, including:

the power supply module is connected in series with the exciting coil of the loudspeaker and is used for supplying power to the exciting coil so as to enable the loudspeaker to work normally;

the power electronic device is connected in series in a series loop of the power supply module and the exciting coil of the loudspeaker;

the input end of the amplifying module is connected with the input end of the loudspeaker, and the output end of the amplifying module is connected with the input end of the rectifying module and is used for amplifying and outputting the audio signal when the audio signal is input into the loudspeaker;

and the output end of the rectifying module is connected with the control end of the power electronic device and is used for converting the amplified audio signal output by the amplifying module into a direct current signal to be output so as to control the power electronic device to be conducted.

Optionally, the amplifying module is a step-up transformer, and a primary of the step-up transformer is connected with an input end of the speaker, and a secondary of the step-up transformer is connected with an input end of the rectifying module, and is used for amplifying and outputting the audio signal when the audio signal is input to the speaker.

Optionally, the rectifying module is a diode, an anode of the diode is connected with an output end of the amplifying module, and a cathode of the diode is connected with a control end of the power electronic device.

Optionally, the power module is a constant current source, a first end of the constant current source is connected with a first end of the exciting coil, a second end of the exciting coil is connected with a first end of the power electronic device, a second end of the power electronic device is grounded and connected with a second end of the constant current source, and a control end of the constant current source is connected with an output end of the rectifying module.

Optionally, the power electronic device further comprises a voltage stabilizing module, wherein the positive electrode of the voltage stabilizing module is grounded, and the negative electrode of the voltage stabilizing module is connected with the control end of the power electronic device.

Optionally, the power electronic device further comprises a delay circuit, an input end is connected with an output end of the rectifying module, an output end is connected with a control end of the power electronic device and used for controlling the power electronic device to be turned on when the audio signal input exists in the loudspeaker, and controlling the power electronic device to be turned off when the audio signal input does not exist in the loudspeaker all the time within a preset time period.

Optionally, the delay circuit includes a discharging resistor and a capacitor, a first end of the discharging resistor is respectively connected with an output end of the rectifying module, a first end of the capacitor is connected with a control end of the power electronic device, a second end of the capacitor is grounded, and a second end of the capacitor is grounded.

Optionally, the delay circuit further includes a charging resistor, a first end of the charging resistor is connected with the output end of the rectifying module and the first end of the discharging resistor, and a second end of the charging resistor is connected with the first end of the capacitor and the control end of the power electronic device.

In order to solve the technical problem, the utility model also provides a control device of the loudspeaker, which comprises an exciting coil and the control circuit of the loudspeaker, wherein the control circuit of the loudspeaker is connected with the exciting coil.

The utility model provides a control circuit of a loudspeaker, which comprises a power supply module, an amplifying module, a rectifying module and a power electronic device, wherein the amplifying module is connected with the loudspeaker and used for amplifying an audio signal input to the loudspeaker; when the power electronic device is turned off, the exciting coil is not electrified, and the loudspeaker cannot work; therefore, the control of the starting and the closing of the loudspeaker is realized through the on and the off of the power electronic device, the detection of the audio signal input to the loudspeaker is realized through the matching of the amplifying module and the rectifying module, and the power electronic device is controlled according to the detection condition of the audio signal, so that the automatic starting and the closing of the loudspeaker are realized. Compared with the control process of the AC power supply, the circuit has the advantages of simple structure, easy realization, no need of introducing complex devices such as a relay, a singlechip and the like, reduced device investment, reduced control cost, convenient use, high reliability, miniaturization, low cost, high reliability and the like.

The utility model also provides a control device of the loudspeaker, which has the same beneficial effects as the control circuit of the loudspeaker.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a control circuit of a speaker according to the present utility model;

fig. 2 is a schematic structural diagram of a control circuit of another speaker according to the present utility model;

fig. 3 is a schematic structural diagram of a control device for a speaker according to the present utility model.

Detailed Description

The utility model provides a control circuit and a device of a loudspeaker, which realize the detection of an audio signal input to the loudspeaker through the matching of an amplifying module and a rectifying module, and control a power electronic device according to the detection condition of the audio signal, thereby realizing the automatic on-off of the loudspeaker. Compared with the control process of the AC power supply, the circuit has the advantages of simple structure, easy realization, no need of introducing complex devices such as a relay, a singlechip and the like, reduced device investment, reduced control cost, convenient use, high reliability, miniaturization, low cost, high reliability and the like.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a control circuit of a speaker according to the present utility model; to solve the above technical problem, the present utility model provides a control circuit 31 of a speaker, comprising:

the power supply module 4 is connected in series with the exciting coil RL of the loudspeaker 1 and is used for supplying power to the exciting coil RL so as to enable the loudspeaker 1 to work normally;

the power electronic device Q1 is connected in series in a series loop of the power module 4 and the exciting coil RL of the loudspeaker 1;

the input end of the amplifying module 2 is connected with the input end of the loudspeaker 1, and the output end of the amplifying module 2 is connected with the input end of the rectifying module 3 and is used for amplifying and outputting the audio signal when the audio signal input exists in the loudspeaker 1;

and the output end of the rectifying module 3 is connected with the control end of the power electronic device Q1 and is used for converting the amplified audio signal output by the amplifying module 2 into a direct current signal to be output so as to control the power electronic device Q1 to be conducted.

Specifically, when an audio signal is input at the input end of the speaker 1, that is, the speaker 1 needs to enter a working state of playing music, the amplifying module 2 amplifies the audio signal after detecting the audio signal and outputs the audio signal to the rectifying module 3, the rectifying module 3 converts the audio signal into a direct current signal and outputs the direct current signal to the control end of the power electronic device Q1, the power electronic device Q1 is conducted under the control of the direct current signal, a series circuit between the power module 4 and the exciting coil RL is conducted, the power module 4 can supply power to the exciting coil RL, the exciting coil RL is powered, and the speaker 1 starts working; when no audio signal is input to the input end of the loudspeaker 1, the amplifying module 2 cannot detect the audio signal, no signal is output, the rectifying module 3 also does not output a direct current signal, the power electronic device Q1 is in an off state at the moment, a series circuit between the power module 4 and the exciting coil RL is disconnected, the power module 4 cannot supply power to the exciting coil RL, the exciting coil RL loses power, and the loudspeaker 1 does not work. Therefore, the automatic on-off of the loudspeaker 1 is realized through the on-off of the power electronic device Q1, namely, when the loudspeaker does not play music, the power supply for the exciting coil RL of the loudspeaker can be disconnected, and when the music is played, the power supply for the exciting coil RL of the loudspeaker can be automatically turned on, so that the problems of reducing the power consumption and reducing the heat of the exciting loudspeaker are solved.

It should be noted that, the audio signal at the input end of the speaker 1 is usually an ac voltage signal, so after the audio signal is amplified by the amplifying module 2, the rectifying module 3 is required to convert the audio signal into a dc signal, so that the power electronic device Q1 may be controlled, and the specific type and implementation of the rectifying module 3 are not limited herein, and the utility model may be implemented by rectifying circuits or devices such as a rectifying bridge and a rectifying diode; the exciting coil RL is an internal structure of the loudspeaker 1, the exciting coil RL is actually an electromagnet, and when direct current is introduced, a magnetic field is generated at two ends of the magnetic core, so that the working process of the loudspeaker 1 is realized; therefore, the direct current output by the power module 4 may be implemented by a constant current source, a linear stabilized power source, a battery or other direct current power source, and the present utility model is not particularly limited herein with respect to the specific type and implementation of the power module 4.

It can be understood that the amplifying module 2 can be implemented by circuits or devices such as a boost circuit and an amplifier, the specific type and implementation mode of the amplifying module 2 are not limited in this utility model, the input end of the amplifying module 2 is connected with the input end of the speaker 1, the function of detecting the audio signal of the input end of the speaker 1 is achieved, the amplifying process can enable the speaker 1 to accurately realize startup when receiving a smaller audio signal, the amplifying module 2 can improve the accuracy of the whole control circuit to the audio signal, the speaker 1 can be ensured to be fast once the audio signal is input, and the speed and reliability of automatic startup are ensured.

The control circuit 31 of the loudspeaker provided by the utility model has clear and definite structure, and has the advantages of miniaturization, low cost, high reliability and the like. Simple structure, small volume, convenient use and low cost. The specific type and implementation mode of the power electronic device Q1 are not particularly limited herein, and the utility model can be implemented by using a power electronic switch such as a triode, a MOS transistor (Metal Oxide Semiconductor Field Effect Transistor, a metal oxide semiconductor type field effect transistor) or an IGBT (Insulated Gate Bipolar Transistor ), and compared with the prior art in which a mode of controlling an ac power supply by means of a complex control circuit such as a relay and a singlechip is required, the power electronic device Q1 has good switching characteristics, small loss, simple control and high switching speed, and is beneficial to accurate implementation of the control circuit 31 of the speaker.

The utility model provides a control circuit 31 of a loudspeaker, which comprises a power supply module 4, an amplifying module 2, a rectifying module 3 and a power electronic device Q1, wherein the amplifying module 2 is connected with the loudspeaker 1 to amplify an audio signal input to the loudspeaker 1, the rectifying module 3 is connected with the amplifying module 2 to convert the amplified audio signal into a direct current signal and output the direct current signal to a control end of the power electronic device Q1, so that the power supply circuit between the power supply module 4 and an exciting coil RL is conducted and disconnected by controlling the on or off of the power electronic device Q1, when the power electronic device Q1 is conducted, the exciting coil RL is electrified, and the loudspeaker 1 works; when the power electronic device Q1 is turned off, the exciting coil RL is not electrified, and the loudspeaker 1 cannot work; therefore, the control of the starting and the stopping of the loudspeaker 1 is realized through the on and the off of the power electronic device Q1, the detection of the audio signal input to the loudspeaker 1 is realized through the matching of the amplifying module 2 and the rectifying module 3, and the power electronic device Q1 is controlled according to the detection condition of the audio signal, so that the automatic starting and the stopping of the loudspeaker 1 are realized. Compared with the control process of the AC power supply, the circuit has the advantages of simple structure, easy realization, no need of introducing complex devices such as a relay, a singlechip and the like, reduced device investment, reduced control cost, convenient use, high reliability, miniaturization, low cost, high reliability and the like.

On the basis of the above embodiment, please refer to fig. 2, fig. 2 is a schematic diagram of a control circuit of another speaker according to the present utility model; wherein the power amplifier is connected with the loudspeaker and the power amplifier circuit.

As an alternative embodiment, the amplifying module 2 is a step-up transformer T1, and the primary of the step-up transformer T1 is connected to the input terminal of the speaker 1, and the secondary is connected to the input terminal of the rectifying module 3, for amplifying and outputting an audio signal when the speaker 1 has the audio signal input.

Considering that the control circuits such as the singlechip and the like adopted in the prior art must have a group of power supplies when in use, and the direct current power supply is usually used for supplying power to normally work, the control circuits are inconvenient in certain scenes, the limitation is large, the amplification module 2 is directly realized by adopting the step-up transformer T1, the step-up transformer T1 is not required to be supplied with power by an external power supply, the control circuits are more flexible and simple in use, the amplification process of audio signals can be accurately realized through step-up, the requirements of different application scenes can be realized by adjusting the number of turns and the like, meanwhile, the isolation effect can be achieved, the influence of interference signals on the whole circuit is further avoided, and the power supply of the excitation type loudspeaker can be automatically switched on and off under the condition of no external power supply, so that the problems of reducing power consumption and reducing the heat quantity of the excitation type loudspeaker are solved. The specific type and parameter selection of the step-up transformer T1 are not particularly limited herein, and may be adjusted according to practical application requirements.

Specifically, the function of the amplifying module 2 is realized through the step-up transformer T1, the amplifying function can be accurately realized under the passive condition, the structure is simple, the implementation is easy, the use is convenient, the adjustability is strong, the whole control circuit does not need an external power supply to supply power, the application range of the passive circuit is wider, and the application scene of the whole control circuit is further expanded.

As an alternative embodiment, the rectifying module 3 is a diode VD1, the anode of the diode VD1 is connected to the output terminal of the amplifying module 2, and the cathode of the diode VD1 is connected to the control terminal of the power electronic device Q1.

It can be understood that the rectifying function of the rectifying module 3 can be realized by a simple diode VD1, the one-way conductivity of the diode VD1 is utilized to convert the ac signal output by the amplifying module 2 into the dc signal for outputting, so as to realize the control of the power electronic device Q1, the specific type and parameter selection of the diode VD1 are not limited herein, and the utility model can be adjusted according to the actual application requirements. The rectifying module 3 may also be implemented by other types of unidirectional conduction devices, or may also be implemented by circuits such as a rectifying bridge.

Specifically, the rectifier module 3 is realized through the diode VD1, so that the rectifier function of the rectifier module 3 can be effectively realized, the structure is simple, the implementation is easy, the cost is low, the volume is small, the use is convenient, the volume of the whole control circuit is further reduced, and the cost is saved.

As an alternative embodiment, the power module 4 is a constant current source, a first end of which is connected to a first end of the exciting coil RL, a second end of which is connected to a first end of the power electronic device Q1, a second end of the power electronic device Q1 is grounded and connected to a second end of the constant current source, and a control end is connected to an output end of the rectifying module 3.

Considering that an external power supply source can cause certain limitation on application scenes and is easy to be disturbed and unstable in output, the power supply to the exciting coil RL can be realized through a constant current source, the constant current source is connected to two ends of the exciting coil RL, and a power electronic device Q1 is connected in series in a loop, so that whether the exciting coil RL is electrified or not can be controlled through the on and off of the power electronic device Q1. The specific type and parameter selection of the constant current source are not particularly limited herein, and can be adjusted according to actual application requirements.

Specifically, the power module 4 is realized through the constant current source, so that the function of supplying power to the exciting coil RL by the power module 4 can be effectively realized, the constant current source is stable in output, the accuracy and the reliability of the control circuit for controlling the working process of the loudspeaker 1 can be further improved, the circuit structure is simple, the volume is small, the realization is easy, the use is convenient, the application scene of the control circuit is further expanded, and the limitation is reduced.

As an alternative embodiment, the power electronic device further includes a voltage stabilizing module DZ3, wherein the positive electrode of the voltage stabilizing module DZ3 is grounded, and the negative electrode is connected with the control terminal of the power electronic device Q1.

Considering that the direct current signal output by the rectifying module 3 may be disturbed by other factors and unstable conditions such as jitter exist, the control end of the power electronic device Q1 is additionally provided with the grounded voltage stabilizing module DZ3, so that stability of the voltage signal input to the control of the power electronic device Q1 is further ensured, and meanwhile, the voltage of the control end is further enabled to be in a safe range by being used as a protection circuit of the power electronic device Q1, and damage of the power electronic device Q1 caused by overlarge voltage and the like are avoided. The specific type and implementation of the voltage stabilizing module DZ3 are not particularly limited, and the voltage stabilizing module DZ3 can be realized by a voltage stabilizing diode VD1 or a linear voltage stabilizing source, and the setting of the voltage stabilizing value of the voltage stabilizing module DZ3 can be determined according to different types of the power electronic device Q1.

Specifically, the voltage stabilizing module DZ3 is additionally arranged at the control end of the power electronic device Q1, so that the voltage stability of the control end of the power electronic device Q1 is ensured, the misoperation of the power electronic device Q1 is avoided in a safety range, the accuracy and the reliability of the control of the power electronic device Q1 by the direct current signal output by the rectifying module 3 are improved, and the accurate realization of the whole control circuit is ensured.

As an alternative embodiment, the electronic device further comprises a delay circuit, an input end of the delay circuit is connected with an output end of the rectifying module 3, and an output end of the delay circuit is connected with a control end of the power electronic device Q1 and used for controlling the power electronic device Q1 to be turned on when the loudspeaker 1 has audio signal input, and controlling the power electronic device Q1 to be turned off when the loudspeaker 1 has no audio signal input all the time within a preset time period.

Considering that during the application process, when the speaker 1 plays audio, there may be a short interruption due to the interference signal or the quality of the audio itself, the speaker 1 does not need to be stopped at this time, so a delay circuit is additionally provided, and the power electronic device Q1 is still kept in a conducting state immediately after the amplification module 2 does not detect the audio signal, but when the speaker 1 does not have audio signal input all the time within a preset period of time, it is proved that the speaker 1 does not need to work at this time, and at this time, the power electronic device Q1 needs to be controlled to be turned off to control the speaker 1 to stop working. The specific type and implementation of the delay circuit are not particularly limited herein; the specific value, implementation mode, etc. of the preset time period can be adjusted according to the specific setting mode, etc. of the delay circuit according to the application requirement, and the utility model is not particularly limited herein.

It can be understood that the control circuit added with the delay circuit has higher reliability, and avoids misoperation of the power electronic device Q1; when the music playing is detected, the switch is turned on instantaneously, and after the music is stopped, the power-off action can be performed only after waiting for a preset time period, such as 2 minutes, so that the power-on is automatically started when the next music playing is waited. While this latency can be adjusted by different settings of the delay circuit. The accuracy of the control process of the loudspeaker 1 is further improved while saving electrical energy.

Specifically, a delay circuit between the rectifying module 3 and the power electronic device Q1 is additionally arranged, so that the accuracy and reliability of the control process of the power electronic device Q1 are further improved, the power electronic device Q1 is prevented from being turned off by mistake due to interference signals or audio quality, the electric energy is saved, the accuracy of the control process of the loudspeaker 1 is further improved, and the reliability of the control circuit is ensured.

As an alternative embodiment, the delay circuit includes a discharging resistor R4 and a capacitor C6, where a first end of the discharging resistor R4 is connected to the output end of the rectifying module 3, a first end of the capacitor C6 is connected to the control end of the power electronic device Q1, a second end is grounded, and a second end of the capacitor C6 is grounded.

It can be understood that the function of the delay circuit can be realized through the discharging process of the capacitor C6, so that the discharging resistor R4 and the capacitor C6 are used as the delay circuit, the discharging resistor R4 and the capacitor C6 also have a filtering function, the accuracy and the reliability of the control process of the power electronic device Q1 are further improved, the discharging resistor R4 is used as a discharging loop of the capacitor C6, the preset time period can be regulated by regulating the value of the capacitor C6 and the resistance value of the discharging resistor R4, the specific types and the parameter values of the discharging resistor R4 and the capacitor C6 are not particularly limited, the capacitor C6 can be selected and regulated according to the actual application requirements, the electrolytic capacitor or the common capacitor can be selected, the discharging resistor R4 can be realized through a fixed resistor or a variable resistor, and the like.

Specifically, the delay circuit is realized through the circuit formed by the discharge resistor R4 and the capacitor C6, the delay shutdown control of the delay circuit to the loudspeaker 1 is realized through the discharge process of the capacitor C6, the delay time can be adjusted through the specific parameter values of the discharge resistor R4 and the capacitor C6, the circuit structure is simple, the realization is easy, the flexibility is strong, the volume is small, the use is convenient, the cost is low, the function of the delay circuit is effectively realized, the error shutdown is avoided, and the accuracy and the reliability of the control process of the whole control circuit to the loudspeaker 1 are further improved.

As an alternative embodiment, the delay circuit further comprises a charging resistor R3, wherein a first end of the charging resistor R3 is connected to the output end of the rectifying module 3 and a first end of the discharging resistor R4, respectively, and a second end of the charging resistor R3 is connected to a first end of the capacitor C6 and a control end of the power electronic device Q1, respectively.

It should be understood that, in order to further protect the capacitor C6 and ensure the charging process of the capacitor C6, a charging resistor R3 connected to the capacitor C6 is added, and the specific type and parameter values of the charging resistor R3 are not particularly limited herein, and the present utility model may be selected and adjusted according to the actual application requirement, and may be implemented by a fixed resistor or a variable resistor. After the charging resistor R3 is added, the charging time of the capacitor C6 can be adjusted by adjusting the resistance value of the charging resistor R3, and the discharging time of the capacitor C6 can be adjusted by adjusting the resistance value of the discharging resistor R4, so that the loudspeaker 1 is ensured to be started up quickly and simultaneously avoid being shut down by mistake.

Specifically, the charging resistor R3 connected with the capacitor C6 is additionally arranged, so that the capacitor C6 can be further protected, the damage of the capacitor C6 caused by instantaneous large voltage and the like are avoided, meanwhile, the starting-up speed of the loudspeaker 1 is ensured by adjusting the charging resistor R3, and the loudspeaker is simple in structure, easy to realize, small in size, low in cost and convenient to use, and the safety and reliability of a control circuit are further ensured.

As a specific embodiment, as shown in fig. 2, is a constant current source, the exciting coil RL Is driven by a constant current mode, RL Is the exciting coil, and the power electronic device Q1 uses an NMOS tube as a switch to control on/off of the exciting circuit. The voltage stabilizing module DZ3 is a zener diode connected in parallel between the G end and the S end of the MOS tube so as to protect the MOS tube from being damaged by overvoltage breakdown. The charging resistor R3 and the capacitor C6 form an RC circuit, and the capacitor C6, the charging resistor R3 and the discharging resistor R4 form a discharging circuit of the capacitor C6. The diode VD1 adopts a rectifying diode as the rectifying module 3 for converting an ac signal into a dc signal. T1 is an audio transformer, signal isolation and transmission can be effectively carried out in audio bandwidth, the transformation ratio is 1:9, and the transformer T1 with large transformation ratio is used as an amplifying module 2, so that whether the loudspeaker 1 is started or not can be effectively judged when the signal amplitude of the input end of the loudspeaker 1 is smaller.

When music is not played in the loudspeaker 1, all the devices are normal, the power electronic device Q1 is turned off, the exciting coil RL is not electrified, when music playing begins, the secondary of the transformer T1 connected in parallel with the two ends of the input side of the loudspeaker 1 can obtain a signal amplified by 9 times, the alternating current signal is rectified by the rectifying diode VD1 and becomes pulsating direct current, the capacitor C6 is charged through the charging resistor R3, the voltage at the two ends of the capacitor C6 is increased along with the full charge until the voltage stabilizing value of the voltage stabilizing module DZ3 reaches 12V, then VGS exceeds the starting voltage of the MOS tube, the exciting coil RL is electrified, and the loudspeaker 1 works normally.

Since the music signal is also discontinuous, when the music signal is temporarily suspended, for example, 10s, the transformer T1 does not receive the music signal, so that no signal voltage is generated at the secondary side of the transformer T1, the capacitor C6 is not continuously charged, the capacitor C6 is discharged through the charging resistor R3 and the discharging resistor R4, the discharging time is about 1.1rc, R is the resistance value of the charging resistor R3 and the discharging resistor R4 connected in series, C is the capacitance value of the capacitor C6, the voltage at both ends of the capacitor C6 slowly decreases from 12V, when the voltage drops below the turn-on voltage of the MOS transistor, the MOS transistor is turned off, the exciting coil RL stops working, and the automatic shutdown is completed. When the music pauses, the error shutdown is not generated as long as the set discharging time is not exceeded, and meanwhile, the discharging time can be adjusted by changing the RC parameters, so that the method is flexible and convenient.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a control device for a speaker according to the present utility model. In order to solve the above technical problem, the present utility model further provides a control device of the speaker 1, which includes an exciting coil RL and a control circuit 31 of the speaker as described above, wherein the control circuit 31 of the speaker is connected with the exciting coil RL.

It will be appreciated that the exciting coil RL is provided in the loudspeaker 1, and the control circuit controls the operation and non-operation of the loudspeaker 1 by the power up and power down of the exciting coil RL, the loudspeaker 1 being normally connected to a power amplifier circuit on the input side when in use, as shown in fig. 2. The specific type and implementation of the exciting coil RL and the speaker 1 are not particularly limited herein.

For the description of the control device of the speaker 1 provided by the present utility model, please refer to the embodiment of the control circuit 31 of the speaker, and the description of the present utility model is omitted herein.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.

It should also be noted that in this specification, relational terms such as first and second, and the like are 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. Moreover, 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. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control circuit for a speaker, comprising:

2. The speaker control circuit of claim 1, wherein the amplification module is a step-up transformer, a primary of the step-up transformer being connected to an input of the speaker, and a secondary of the step-up transformer being connected to an input of the rectification module for amplifying and outputting an audio signal when the audio signal is input to the speaker.

3. The speaker control circuit of claim 2, wherein the rectifying module is a diode, a positive electrode of the diode is connected to the output terminal of the amplifying module, and a negative electrode of the diode is connected to the control terminal of the power electronic device.

4. The speaker control circuit of claim 1, wherein the power supply module is a constant current source, a first end of the constant current source is connected to a first end of the exciting coil, a second end of the exciting coil is connected to a first end of the power electronics, a second end of the power electronics is grounded and connected to a second end of the constant current source, and a control end is connected to an output end of the rectifying module.

5. The speaker control circuit of claim 1, further comprising a voltage regulator module having an anode coupled to ground and a cathode coupled to a control terminal of the power electronics.

6. The control circuit of a loudspeaker according to any one of claims 1 to 5, further comprising a delay circuit having an input connected to the output of the rectifying module and an output connected to the control of the power electronics for controlling the power electronics to turn on when the loudspeaker is in the presence of an audio signal input and off when the loudspeaker is not in the presence of an audio signal input for a predetermined period of time.

7. The loudspeaker control circuit of claim 6 wherein the delay circuit comprises a discharge resistor and a capacitor, the first end of the discharge resistor being connected to the output of the rectifier module, the first end of the capacitor being connected to the control terminal of the power electronics, the second end being grounded, the second end of the capacitor being grounded.

8. The speaker control circuit as recited in claim 7 wherein said delay circuit further comprises a charge resistor having a first terminal connected to said rectifier module output terminal and said discharge resistor first terminal, respectively, and a second terminal connected to said capacitor first terminal and said power electronics control terminal, respectively.

9. A control device of a loudspeaker, characterized by comprising an excitation coil and a control circuit of the loudspeaker according to any one of claims 1 to 8, the control circuit of the loudspeaker being connected to the excitation coil.