CN218920608U - Speaker protection circuit, speaker and electronic equipment - Google Patents
Speaker protection circuit, speaker and electronic equipment Download PDFInfo
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- CN218920608U CN218920608U CN202223285784.6U CN202223285784U CN218920608U CN 218920608 U CN218920608 U CN 218920608U CN 202223285784 U CN202223285784 U CN 202223285784U CN 218920608 U CN218920608 U CN 218920608U
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- loudspeaker
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The utility model discloses a loudspeaker protection circuit, a loudspeaker and electronic equipment, and relates to the field of loudspeaker protection. Because the current between the positive output end of the power amplifier and the positive input end of the loudspeaker is alternating current, and a parasitic diode exists in the MOS tube, and the current still exists from the source electrode to the drain electrode after the MOS tube is turned off, the source electrodes of the two MOS tubes are connected to ensure that the two MOS tubes can be thoroughly turned off. The control module is used for controlling the first N-type MOS tube and the second N-type MOS tube to be turned on and off, and the MOS tube has the advantages that the MOS tube has no mechanical contact, the tone quality of a loudspeaker is not affected, and the MOS tube with larger overcurrent capacity is small in size, convenient to miniaturize, low in power consumption and low in cost.
Description
Technical Field
The present utility model relates to the field of speaker protection, and in particular, to a speaker protection circuit, a speaker, and an electronic device.
Background
With the continuous development of technology, electronic devices, especially some electronic devices with speakers, have been widely used, so the requirements of users on speaker protection are increasing, and in the prior art, a speaker protection circuit is usually disposed between a power amplifier and a speaker to protect the speaker.
The loudspeaker protection circuit in the prior art adopts an electromagnetic relay, and the electromagnetic relay can be switched on and off by whether a mechanical contact is attracted or not, so that the power amplifier and the loudspeaker are switched on or off. The electromagnetic relay has a mechanical contact, the resistance of the mechanical contact is tens of milliohms, and as the number of times of switching on and switching off increases, the contact of the electromagnetic relay gradually oxidizes, and the resistance of the contact also increases, so that resonance is generated with a loudspeaker, and the sound quality of the loudspeaker is affected. In addition, when the electromagnetic relay is switched on and off, an arc is generated in the electromagnetic relay, and when the electromagnetic relay is severe, contacts of the electromagnetic relay are adhered, so that the electromagnetic relay is disabled, and the reliability and the safety are low. In addition, in order to complete the protection of the loudspeaker, an electromagnetic relay with larger overcurrent capacity needs to be selected, and the electromagnetic relay with larger overcurrent capacity has overlarge volume, is unfavorable for miniaturization of a protection circuit, and has higher cost and higher power consumption.
Disclosure of Invention
The utility model aims to provide a loudspeaker protection circuit, a loudspeaker and electronic equipment, and the MOS tube has the advantages that the MOS tube has no mechanical contact, the sound quality of the loudspeaker is not affected, and the MOS tube with larger overcurrent capacity has small volume, is convenient for miniaturization, and has low power consumption and low cost.
In order to solve the above technical problems, the present utility model provides a speaker protection circuit, including:
the grid electrode of the first N-type MOS tube is connected with the control module, the negative output end of the power amplifier is connected with a second ground, and the second ground is different from the first ground;
the drain electrode of the second N-type MOS tube is connected with the positive input end of the loudspeaker, and the grid electrode of the second N-type MOS tube is connected with the control module;
the control module is used for controlling the on/off of the first N-type MOS tube and the second N-type MOS tube.
Preferably, the control module includes:
a power supply;
the first end of the controllable switch is connected with the output end of the power supply, and the second end of the controllable switch is connected with the grid electrode of the first N-type MOS tube and the second N-type MOS tube respectively.
Preferably, the power supply is an isolated power supply.
Preferably, the isolated power supply is a DCDC isolated power supply.
Preferably, the controllable switch is an optocoupler;
the collector of the light receiver in the optocoupler is connected with the output end of the power supply, and the emitter of the light receiver is respectively connected with the grid electrode of the first N-type MOS tube and the second N-type MOS tube.
Preferably, the method further comprises:
the first end of the discharging module is connected with the grid electrode of the first N-type MOS tube and the grid electrode of the second N-type MOS tube respectively, and the second end of the discharging module is connected with the ground and is used for discharging the voltage of the grid electrode of the first N-type MOS tube and the voltage of the grid electrode of the second N-type MOS tube when the first N-type MOS tube and the second N-type MOS tube are turned off.
Preferably, the discharge module is a resistor;
the first end of the resistor is connected with the grid electrode of the first N-type MOS tube and the grid electrode of the second N-type MOS tube respectively, and the second end of the resistor is connected with the ground and is used for discharging the voltage of the grid electrode of the first N-type MOS tube and the voltage of the grid electrode of the second N-type MOS tube when the first N-type MOS tube and the second N-type MOS tube are turned off.
In order to solve the technical problems, the utility model also provides a loudspeaker, which comprises a loudspeaker body and the loudspeaker protection circuit, wherein the loudspeaker body is connected with the loudspeaker protection circuit.
In order to solve the technical problem, the utility model also provides electronic equipment which comprises a power amplifier and the loudspeaker, wherein the power amplifier is connected with the loudspeaker.
The utility model aims to provide a loudspeaker protection circuit, a loudspeaker and electronic equipment, wherein the current between the positive output end of a power amplifier and the positive input end of the loudspeaker is alternating current, and parasitic diodes exist in MOS (metal oxide semiconductor) tubes, and when the MOS tubes are turned off, the current still exists from a source electrode to a drain electrode, so that the source electrodes of the two MOS tubes are connected to ensure that the two MOS tubes can be thoroughly turned off. The control module is used for controlling the first N-type MOS tube and the second N-type MOS tube to be turned on and off, and the MOS tube has the advantages that the MOS tube has no mechanical contact, the tone quality of a loudspeaker is not affected, and the MOS tube with larger overcurrent capacity is small in size, convenient to miniaturize, low in power consumption and low in cost.
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 speaker protection circuit according to the present utility model;
fig. 2 is a schematic structural diagram of another speaker protection circuit according to the present utility model.
Detailed Description
The utility model has the core of providing a loudspeaker protection circuit, a loudspeaker and electronic equipment, and the MOS tube has the advantages that the MOS tube has no mechanical contact, the tone quality of the loudspeaker is not affected, and the MOS tube with larger overcurrent capacity has small volume, is convenient for miniaturization, and has low power consumption and low cost.
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 speaker protection circuit according to the present utility model. The speaker protection circuit includes:
a first N-type MOS (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-Oxide semiconductor field effect transistor) tube 1, wherein the drain electrode of the first N-type MOS tube 1 is connected with the positive output end of the power amplifier, the source electrode of the first N-type MOS tube 1 is connected with the source electrode of the second N-type MOS tube 2, the public end connected with the source electrode of the second N-type MOS tube is connected with a first ground, the grid electrode of the first N-type MOS tube 1 is connected with a control module 3, the negative output end of the power amplifier is connected with a second ground, and the second ground is different from the first ground;
the drain electrode of the second N-type MOS tube 2 is connected with the positive input end of the loudspeaker, and the grid electrode of the second N-type MOS tube 2 is connected with the control module 3;
the control module 3 is used for controlling the on/off of the first N-type MOS tube 1 and the second N-type MOS tube 2.
In the utility model, the loudspeaker protection circuit comprises a first N-type MOS tube 1 and a second N-type MOS tube 2, and the control module 3 realizes the on and off of the loudspeaker by controlling the on and off of the two MOS tubes. Because the first N-type MOS tube 1 and the second N-type MOS tube 2 are connected between the positive output end of the power amplifier and the positive input end of the loudspeaker, and the current between the positive output end of the power amplifier and the positive input end of the loudspeaker is alternating current, after the two MOS tubes are conducted, the current flowing through the two MOS tubes can flow from the drain electrode to the source electrode or from the source electrode to the drain electrode, but because a parasitic diode is arranged in the MOS tube, only the current from the source electrode to the drain electrode exists when the MOS tube is turned off, the source electrode of the first N-type MOS tube 1 and the source electrode of the second N-type MOS tube 2 are connected, and the common end connected with the first ground is connected, so that the thorough turn-off of the first N-type MOS tube 1 and the second N-type MOS tube 2 can be ensured, and the stability of the circuit is improved. The MOS tube has the advantages that the MOS tube has no mechanical contact, the tone quality of a loudspeaker is not affected, and the MOS tube with larger overcurrent capacity has small volume, is convenient for miniaturization, and has low power consumption and low cost.
In the utility model, the loudspeaker protection circuit comprises the control module 3, because the first N-type MOS tube 1 is conducted when the voltage of the control end of the first N-type MOS tube reaches a first starting voltage threshold, and the second N-type MOS tube 2 is conducted when the voltage of the control end of the first N-type MOS tube reaches a second starting voltage threshold, the control module 3 controls the first N-type MOS tube 1 and the second N-type MOS tube 2 to be started by providing preset voltage values for the grid electrode of the first N-type MOS tube 1 and the grid electrode of the second N-type MOS tube 2, controls the first N-type MOS tube 1 and the second N-type MOS tube 2 to be started by not providing preset voltage values for the grid electrode of the first N-type MOS tube 1 and the grid electrode of the second N-type MOS tube 2, and controls the first N-type MOS tube 1 and the second N-type MOS tube 2 to be started and started in time by providing preset voltage values larger than the first starting voltage threshold and the second starting voltage threshold, so that the reliability of the loudspeaker protection circuit is improved.
It should be noted that, the negative output end of the power amplifier is connected to the second ground, the first end of the first N-type MOS tube 1 is connected to the positive output end of the power amplifier, the second end of the first N-type MOS tube 1 is connected to the first ground, the second ground must be different from the first ground, if the first ground is the same as the second ground, the negative output end and the positive output end of the power amplifier will be short-circuited, resulting in the output end of the power amplifier being short-circuited, and the whole speaker protection circuit will not work normally.
The embodiment provides a loudspeaker protection circuit, because the current between the positive output end of the power amplifier and the positive input end of the loudspeaker is alternating current, and parasitic diodes exist in the MOS tubes, and when the MOS tubes are turned off, the current still exists from the source electrode to the drain electrode, so that the source electrodes of the two MOS tubes are connected to ensure that the two MOS tubes can be thoroughly turned off. The control module 3 controls the first N-type MOS tube 1 and the second N-type MOS tube 2 to be turned on and off, and the MOS tube has the advantages that the MOS tube has no mechanical contact, the tone quality of a loudspeaker is not affected, and the MOS tube with larger overcurrent capacity is small in volume, convenient to miniaturize, low in power consumption and low in cost.
Based on the above embodiments:
referring to fig. 2, fig. 2 is a schematic structural diagram of another speaker protection circuit according to the present utility model. As a preferred embodiment, the control module 3 comprises:
a power supply 31;
the first end of the controllable switch 32 is connected with the output end of the power supply 31, and the second end of the controllable switch 32 is respectively connected with the grid electrode of the first N-type MOS tube 1 and the second N-type MOS tube 2.
In the utility model, the control module 3 comprises a power supply 31 and a controllable switch 32, when the controllable switch 32 is closed, the power supply 31 provides a preset voltage value for the grid electrode of the first N-type MOS tube 1 and the grid electrode of the second N-type MOS tube 2, the preset voltage value is larger than the starting voltage of the first N-type MOS tube 1 and the starting voltage of the second N-type MOS tube 2, so that the first N-type MOS tube 1 and the second N-type MOS tube 2 are conducted, and when the controllable switch 32 is closed, the power supply 31 does not provide a preset voltage value for the grid electrode of the first N-type MOS tube 1 and the grid electrode of the second N-type MOS tube 2, so that the first N-type MOS tube 1 and the second N-type MOS tube 2 are turned off, and the first N-type MOS tube 1 and the second N-type MOS tube 2 can be timely controlled to be turned on and off through the design of the controllable switch 32 and the power supply 31, and the circuit efficiency is improved.
In practical applications, the power source 31 may be an isolated power source or other power sources, and the controllable switch 32 may be an optocoupler or other switches.
As a preferred embodiment, the power supply 31 is an isolated power supply.
In the utility model, because the negative output end of the power amplifier is connected with the second ground, the first end of the first N-type MOS tube 1 is connected with the positive output end of the power amplifier, and the second end of the first N-type MOS tube 1 is connected with the first ground, if an isolated power supply is not adopted, the negative output end and the positive output end of the power amplifier are short-circuited, the output end of the power amplifier is short-circuited, and the whole loudspeaker protection circuit cannot work normally. The input and output of the isolation power supply are isolated from each other and are not electrically connected, so that the negative output end and the positive output end of the power amplifier are not connected together, and the source of the first N-type MOS tube 1 and the source of the second N-type MOS tube 2 are changed along with the amplitude of the output signal relative to the negative output end of the power amplifier. But is stable with respect to the output of the power supply 31 only because the negative and positive outputs of the power amplifier are isolated from each other.
In practical applications, the power supply 31 may be a DCDC (Direct Current/Direct Current) isolated power supply or other power supplies.
As a preferred embodiment, the isolated power supply is a DCDC isolated power supply.
In the utility model, the isolated power supply is a DCDC isolated power supply, and has the advantage of high efficiency.
It should be noted that, referring to fig. 2, if the isolated power supply is not used in the circuit, the first ground GND and the second ground AGND will be connected together, then the positive output terminal VOUT of the power amplifier will be directly connected to the AGND through the first N-type MOS transistor 1, so that the output terminal of the power amplifier is short-circuited, the whole circuit cannot work normally, and the power amplifier will be burned out at the same time. However, since AGND and GND of the isolated power supply are isolated from each other only with respect to the second ground AGND, this point is stable with respect to the first ground GND or the output voltage of the power supply 31.
The output voltage of the DCDC isolated power supply may be, but is not limited to, 12V.
As a preferred embodiment, the controllable switch 32 is an optocoupler;
the collector of the light receiver in the optocoupler is connected with the output end of the power supply 31, and the emitter of the light receiver is respectively connected with the grid electrode of the first N-type MOS tube 1 and the second N-type MOS tube 2.
In the present utility model, the controllable switch 32 is an optocoupler. The optical coupler has the advantages that the input end and the output end of the optical coupler are completely electrically isolated, the output signal has no influence on the input end, the anti-interference capability is strong, the working is stable, no contact exists, the service life is long, and the transmission efficiency is high.
As a preferred embodiment, further comprising:
the first end of the discharging module 4 is connected with the grid electrode of the first N-type MOS tube 1 and the grid electrode of the second N-type MOS tube 2 respectively, and the second end of the discharging module 4 is connected with the ground and is used for discharging the voltage of the grid electrode of the first N-type MOS tube 1 and the voltage of the grid electrode of the second N-type MOS tube 2 when the first N-type MOS tube 1 and the second N-type MOS tube 2 are turned off.
In the utility model, the loudspeaker protection circuit further comprises a discharging module 4, and it is to be noted that a general high-power MOS tube often has a larger junction capacitance, when the control module 3 does not provide a preset voltage value for the grid electrode of the first N-type MOS tube 1 and the grid electrode of the second N-type MOS tube 2, the first N-type MOS tube 1 and the second N-type MOS tube 2 are turned off, at this time, if the junction capacitance of the two MOS tubes is larger, charges stored in the junction capacitance are enough to maintain continuous conduction of the MOS tubes, so that the control module 3 fails, and when the discharging module 4 is adopted, the charges stored in the junction capacitance of the two MOS tubes can be discharged when the control module 3 does not provide the preset voltage value for the grid electrode of the first N-type MOS tube 1 and the grid electrode of the second N-type MOS tube 2, so that the reliability of the circuit is improved.
In practical applications, the discharge module 4 may be a resistor or other discharge module.
As a preferred embodiment, the discharge module 4 is a resistor;
the first end of the resistor is connected with the grid electrode of the first N-type MOS tube 1 and the grid electrode of the second N-type MOS tube 2 respectively, and the second end of the resistor is connected with the ground and is used for discharging the voltage of the grid electrode of the first N-type MOS tube 1 and the voltage of the grid electrode of the second N-type MOS tube 2 when the first N-type MOS tube 1 and the second N-type MOS tube 2 are turned off.
In the utility model, the discharging module 4 is a resistor, and the advantage of adopting the resistor is low cost, small volume and long service life.
It should be noted that, the junction capacitance of the MOS transistor discharges through a resistor, for example: the time constant t=1.1rc, the resistance takes 10K, the junction capacitance C is usually 5nF, so as to calculate the discharge time to be 55us, and the turn-off time is still one level shorter than that of the electromagnetic relay.
In order to solve the technical problems, the utility model also provides an embodiment of the loudspeaker, which comprises a loudspeaker body and the loudspeaker protection circuit, wherein the loudspeaker body is connected with the loudspeaker protection circuit.
The speaker provided in this embodiment corresponds to the above device, and therefore has the same beneficial effects as the above device, so the embodiment of the speaker part is referred to the description of the embodiment of the device part, and is not repeated here.
In order to solve the technical problem, the utility model also provides an embodiment of the electronic equipment, which comprises a power amplifier and the loudspeaker, wherein the power amplifier is connected with the loudspeaker.
The electronic device provided in this embodiment corresponds to the above device, and therefore has the same beneficial effects as the above device, so the embodiment of the electronic device part is referred to the description of the embodiment of the device part, and is not repeated here.
It should 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 (9)
1. A speaker protection circuit, comprising: the grid electrode of the first N-type MOS tube is connected with the control module, the negative output end of the power amplifier is connected with a second ground, and the second ground is different from the first ground;
the drain electrode of the second N-type MOS tube is connected with the positive input end of the loudspeaker, and the grid electrode of the second N-type MOS tube is connected with the control module;
the control module is used for controlling the on/off of the first N-type MOS tube and the second N-type MOS tube.
2. The speaker protection circuit as recited in claim 1, wherein the control module comprises:
a power supply;
the first end of the controllable switch is connected with the output end of the power supply, and the second end of the controllable switch is connected with the grid electrode of the first N-type MOS tube and the second N-type MOS tube respectively.
3. The speaker protection circuit as recited in claim 2, wherein the power supply is an isolated power supply.
4. A loudspeaker protection circuit according to claim 3, wherein the isolated power supply is a DCDC isolated power supply.
5. The speaker protection circuit as recited in claim 2, wherein the controllable switch is an optocoupler;
the collector of the light receiver in the optocoupler is connected with the output end of the power supply, and the emitter of the light receiver is respectively connected with the grid electrode of the first N-type MOS tube and the second N-type MOS tube.
6. The speaker protection circuit as recited in any one of claims 1 to 5, further comprising:
the first end of the discharging module is connected with the grid electrode of the first N-type MOS tube and the grid electrode of the second N-type MOS tube respectively, and the second end of the discharging module is connected with the ground and is used for discharging the voltage of the grid electrode of the first N-type MOS tube and the voltage of the grid electrode of the second N-type MOS tube when the first N-type MOS tube and the second N-type MOS tube are turned off.
7. The speaker protection circuit as recited in claim 6, wherein the discharge module is a resistor;
the first end of the resistor is connected with the grid electrode of the first N-type MOS tube and the grid electrode of the second N-type MOS tube respectively, and the second end of the resistor is connected with the ground and is used for discharging the voltage of the grid electrode of the first N-type MOS tube and the voltage of the grid electrode of the second N-type MOS tube when the first N-type MOS tube and the second N-type MOS tube are turned off.
8. A loudspeaker comprising a loudspeaker body and a loudspeaker protection circuit as claimed in any one of claims 1 to 7, the loudspeaker body being connected to the loudspeaker protection circuit.
9. An electronic device comprising a power amplifier and the speaker of claim 8, the power amplifier being coupled to the speaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223285784.6U CN218920608U (en) | 2022-12-07 | 2022-12-07 | Speaker protection circuit, speaker and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223285784.6U CN218920608U (en) | 2022-12-07 | 2022-12-07 | Speaker protection circuit, speaker and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218920608U true CN218920608U (en) | 2023-04-25 |
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ID=86038026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223285784.6U Active CN218920608U (en) | 2022-12-07 | 2022-12-07 | Speaker protection circuit, speaker and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218920608U (en) |
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2022
- 2022-12-07 CN CN202223285784.6U patent/CN218920608U/en active Active
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