CN201821488U - Speaker system used for portable electronic equipment - Google Patents
Speaker system used for portable electronic equipment Download PDFInfo
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- CN201821488U CN201821488U CN2010205612798U CN201020561279U CN201821488U CN 201821488 U CN201821488 U CN 201821488U CN 2010205612798 U CN2010205612798 U CN 2010205612798U CN 201020561279 U CN201020561279 U CN 201020561279U CN 201821488 U CN201821488 U CN 201821488U
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- speaker
- power amplifier
- audio
- loud speaker
- inductance
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Abstract
The utility model discloses a speaker system used for portable electronic equipment, which includes an audio power amplifier, a speaker, an inducer and a PPTC (polymer positive temperature coefficient) device used for limiting the current in case of abnormal current, wherein the speaker and the inducer are connected in series at an output end of the audio power amplifier, and the PPTC device is connected in series with the speaker and the inducer. The speaker system can protect hearing of people's ears, and limit the return current of the speaker of the portable electronic equipment, so as to protect the speaker without sacrificing the speaker performance of the existing portable electronic equipment, enable the speaker of the portable electronic equipment to work normally with the normal current, and protect the speaker and the hearing of people's ears in case of abnormal current.
Description
Technical field
The utility model relates to the loudspeaker techniques field, and more specifically, the utility model relates to a kind of speaker system that is used for portable electric appts.
Background technology
Electronic equipment is to higher transmission speed and more miniaturization development.Well received various portable electric appts generally include notebook computer, mobile phone, PDA(Personal Digital Assistant), MP3 player, MP4 player or digital camera etc. at present.
In portable electric appts, can include loud speaker usually.Loud speaker claims " loudspeaker " again, is a kind of electro-acoustic transducer device very commonly used, can both see it in the electronic electric equipment of sounding.Loud speaker of a great variety, and performance and price differs greatly.The audio frequency electric energy is by electromagnetism, and piezoelectricity or electrostatic effect make the vibration of its cone or diaphragm and produce resonance (sympathetic response) with ambient air and sound.Press transducing mechanism and structure and divide, loud speaker can be divided into moving-coil type (electrodynamic type), condenser type (electrostatic), piezoelectric type (crystal or pottery), electromagnetic type (compressed spring type), the gentle dynamic formula loud speaker of ionization minor etc.Divide by the acoustic radiation material, loud speaker can be divided into cone formula, horn formula, diaphragm type etc.Divide by operating frequency, loud speaker can be divided into bass, middle pitch, high pitch etc.Press the voice coil loudspeaker voice coil impedance and divide, loud speaker can be divided into Low ESR and high impedance.Divide by effect, loud speaker can be divided into straight spoke and ambient sound etc.
The loud speaker of portable electric appts is generally boombox.Boombox is meant built-in loudspeaker, and the user not only can also listen to the sound that portable electric appts sends by boombox by earphone jack like this.Portable electric appts with boombox can be without external speaker, the inconvenience of also having avoided wearing earphone for a long time and being brought.
Special in view of the use occasion of portable electric appts loud speaker not only needs to consider the protection to loudspeaker device itself during design, more need to consider the protection to people's ear.Because it is little that the used Microspeaker of portable electric appts has rated power, the undesirable feature of poor reliability, direct-connected ball bearing made using can produce the bad problem of reliability when immediate current is excessive, and the mistake high sound pressure of excessive immediate current generation may cause the damage of people's ear.
At present, the usual acoustic leak leaks harmful acoustic pressure that people's ear is produced in the existing portable electric appts, thus protection people ear.Yet, utilize sound leakage to protect people's ear can bring the problem of sound leakage usually, promptly own in conversation, others also can clearly hear sound, thereby causes privacy problem.If the cancellation sound leakage, concentrated acoustic energy can improve privacy problem, but the acoustic energy of too concentrating might cause damage to people's ear again.
The utility model content
The utility model provides a kind of speaker system that is used for portable electric appts, with protection people ear hearing.
For achieving the above object, the technical solution of the utility model is as follows:
A kind of speaker system that is used for portable electric appts comprises audio-frequency power amplifier, loud speaker, inductance and be used for rising positive temperature coefficient polymer (PPTC) device of metering function when abnormal current occurs, wherein:
Loud speaker and inductance are connected on the output of audio-frequency power amplifier, and described PPTC device and loud speaker and inductance are connected in series.
The output of described audio-frequency power amplifier is audio frequency power amplifier difference output end Vo+ and Vo-.
Described PPTC device is directly connected with the output of audio-frequency power amplifier, and inductance and loud speaker are connected in series with described PPTC device successively.
Described inductance is directly connected with the output of audio-frequency power amplifier, and PPTC device and loud speaker are connected in series with described inductance successively.
Described portable electric appts is notebook computer, mobile phone, MP3 player, MP4 player, PDA(Personal Digital Assistant) or digital camera.
In technique scheme, loud speaker and inductance are connected on the output of audio-frequency power amplifier, and PPTC device and loud speaker and inductance are connected in series.Therefore, when running current, the normal sounding of the loud speaker of portable electric appts, and when abnormal current occurs, because the current limiting characteristic of PPTC self, thereby the electric current in device moment generation high resistant limiting loudspeaker loop.Therefore, behind application the utility model, can limit foreseeable harmful acoustic pressure by the size of dysregulation electric current.Both can protect people's ear hearing; can limit the back flow current of portable electric appts loud speaker again; thereby protection loudspeaker device; also can not sacrifice existing portable electric appts speaker performance; the loud speaker operate as normal of portable electric appts when making normal current, and when abnormal current, play the effect of protecting loudspeaker device and people's ear.
And the utility model is structurally simple relatively, size is little, in light weight, therefore is applicable to most of portable electric appts, such as notebook computer, mobile phone, MP3 player, MP4 player or digital camera etc.
Description of drawings
Fig. 1 is the speaker system structure chart that is used for portable electric appts according to the utility model execution mode;
Fig. 2 is the speaker system structure chart that is used for portable electric appts according to another execution mode of the utility model.
Embodiment
Express clearlyer for the purpose, technical scheme and the advantage that make the utility model execution mode, the utility model execution mode is further described in more detail below in conjunction with drawings and the specific embodiments.
In execution mode of the present utility model, a kind of speaker system that is used for portable electric appts is proposed.By the recoverable PPTC device of series connection on the speaker circuit of portable electric appts, adjust suitable PPTC parameter then, when running current, the normal sounding of the loud speaker of portable electric appts, and when abnormal current occurs, because the current limiting characteristic of PPTC self, thereby the electric current in PPTC device moment generation high resistant limiting loudspeaker loop.Therefore, the size by the dysregulation electric current is effectively limited for foreseeable harmful acoustic pressure.
Fig. 1 is the speaker system structure chart that is used for portable electric appts according to the utility model execution mode.
As shown in Figure 1, comprise audio-frequency power amplifier 101, positive temperature coefficient polymer (PPTC) device 102, inductance 103 (quantity is 2) and loud speaker 104, wherein loud speaker 104 and inductance 103 are connected on the output of audio-frequency power amplifier 101, and PPTC device 102 is connected in series with loud speaker 104 and inductance 103.More specifically, PPTC device 102 directly with the output end vo of audio-frequency power amplifier 101-connect, an inductance 103 is directly connected with PPTC device 102, the output end vo of another root inductance 103 and audio-frequency power amplifier 101+be connected in series with loud speaker 104.Wherein: inductance 103 can be used to suppress the EMI and the EMC interference of circuit.For digital audio amplifier 101, inductance 103 can also be used to suppressing the Harmonic Interference of PWM digital modulation output, the effect with low-pass filtering.Audio-frequency power amplifier 101 is used for the audio signal of amplifying signal input, and generation can drive the signal of telecommunication of loud speaker 104 operate as normal and the voice signal that loud speaker 104 together produces certain loudness.
For audio-frequency power amplifier 101, corresponding pin is described respectively below.Wherein:
IN+, IN-: be audio frequency power amplifier differential signal input;
Vo+, Vo-: be the audio frequency power amplifier difference output end;
SHDN: for audio frequency power amplifier enables control;
VDD, PVDD: be the audio frequency power amplifier power supply;
GND: be power amplifier ground connection;
Describe PPTC device 102 below again in detail.
PPTC is the abbreviation of Polymeric Positive Temperature Coefficient, and the PPTC device is the high molecular polymer positive-temperature-coefficient device, and this device can be excessive at current surge, when temperature is too high circuit is shielded.During use, generally it is serially connected in the circuit, under normal circumstances, its resistance is very little, and loss is also very little, does not influence the circuit operate as normal; But if there is overcurrent (as short circuit) to take place, its temperature raises, and its resistance sharply raises thereupon, reaches the effect of restriction electric current, avoids damaging the components and parts in the circuit.After fault was got rid of, the temperature of PPTC device descended automatically, returns to low resistive state again, so the PPTC device is called the recoverability fuse again.
More specifically, PPTC device 102 mainly is made up of polyethylene (Polyethylene) and conductor (main component is carbon black (Carbon Black)), under normal operating temperature, polyethylene is strapped in conductor in the crystalloid structure closely, and forms an anti-conductive path of low group.Because it is low that impedance phase is worked as,, can not change the crystal structure of polyethylene so the heat energy that electric current produced of the PPTC assembly of flowing through on the circuit is little.Yet when abnormal current takes place, the heat energy that is produced on the conductor just can become glue (Amorphous) in such cases by crystalloid with polyethylene, and the conductor that is bound in just can separate, and causes impedance to improve rapidly and the restriction abnormal current flows through the PPTC assembly.After abnormal current disappeared, conductor path can be combined into Low ESR again once again.
Particularly, the parameter of PPTC mainly comprises operating current Ihold, trigger current Itrip, operating resistance R and response time t etc.Ihold should be able to guarantee the following operating state of normal signal, and Itrip depends on the maximum current output that will protect.The overall performance that operating resistance R should not influence system is such as loudness, and response time t should satisfy the requirement to the protection of people's ear.
Such as for a mobile phone device system, the possible maximum voltage of loud speaker output is the cell voltage 8.4V of twice, and maximum current is 1.05A for the loud speaker of 8ohm, so can select the PPTC device of Itrip=1A.Operating resistance is less than 0.5ohm, and loudness reduces can not surpass 0.03dB, and being considered to can not influence loudness, and the response time is preferably less than 0.1s.
The PPTC device can directly be connected with the output of audio-frequency power amplifier, and inductance and loud speaker are connected in series with described PPTC device successively.In addition, inductance can directly be connected with the output of audio-frequency power amplifier, and PPTC device and loud speaker are connected in series with described inductance successively.
Fig. 2 is the speaker system structure chart that is used for portable electric appts according to another execution mode of the utility model.
As shown in Figure 2, comprise audio-frequency power amplifier 201, positive temperature coefficient polymer (PPTC) device 202, inductance 202 (two) and loud speaker 204, wherein loud speaker 204 and inductance 202 are connected on the output of audio-frequency power amplifier 201, and PPTC device 203 is connected in series with loud speaker 204 and inductance 202.More specifically, inductance 202 directly with the output end vo of audio-frequency power amplifier 201+connect, PPTC device 203 and loud speaker 204 successively with another root inductance 202 be connected in series to the output end vo of audio-frequency power amplifier 201-.Wherein: inductance 202 can be used to suppress the EMI and the EMC interference of circuit.For digital audio amplifier 201, inductance 202 can also be used to suppressing the Harmonic Interference of PWM digital modulation output, the effect with low-pass filtering.Audio-frequency power amplifier 201 is used for the audio signal of amplifying signal input, and generation can drive the signal of telecommunication of loud speaker 204 operate as normal and the voice signal that loud speaker 204 together produces certain loudness.
For audio-frequency power amplifier 201, corresponding pin is described respectively below.Wherein:
IN+, IN-: be audio frequency power amplifier differential signal input;
Vo+, Vo-: be the audio frequency power amplifier difference output end;
SHDN: for audio frequency power amplifier enables control;
VDD, PVDD: be the audio frequency power amplifier power supply;
GND: be power amplifier ground connection;
Describe PPTC device 203 below again in detail.
PPTC is the abbreviation of Polymeric Positive Temperature Coefficient, and the PPTC device is the high molecular polymer positive-temperature-coefficient device, and this device can be excessive at current surge, when temperature is too high circuit is shielded.During use, generally it is serially connected in the circuit, under normal circumstances, its resistance is very little, and loss is also very little, does not influence the circuit operate as normal; But if there is overcurrent (as short circuit) to take place, its temperature raises, and its resistance sharply raises thereupon, reaches the effect of restriction electric current, avoids damaging the components and parts in the circuit.After fault was got rid of, the temperature of PPTC device descended automatically, returns to low resistive state again, so the PPTC device is called the recoverability fuse again.
More specifically, PPTC device 203 mainly is made up of polyethylene (Polyethylene) and conductor (main component is carbon black (Carbon Black)), under normal operating temperature, polyethylene is strapped in conductor in the crystalloid structure closely, and forms an anti-conductive path of low group.Because it is low that impedance phase is worked as,, can not change the crystal structure of polyethylene so the heat energy that electric current produced of the PPTC assembly of flowing through on the circuit is little.Yet when abnormal current takes place, the heat energy that is produced on the conductor just can become glue (Amorphous) in such cases by crystalloid with polyethylene, and the conductor that is bound in just can separate, and causes impedance to improve rapidly and the restriction abnormal current flows through the PPTC assembly.After abnormal current disappeared, conductor path can be combined into Low ESR again once again.
Particularly, the parameter of PPTC mainly comprises operating current Ihold, trigger current Itrip, operating resistance R and response time t.Ihold should be able to guarantee the following operating state of normal signal, and Itrip depends on the maximum current output that will protect.Operating resistance R should not influence the overall performance of system such as loudness.Response time t should satisfy the requirement to the protection of people's ear.
Such as a mobile telephone system, the possible maximum voltage of loud speaker output is the cell voltage 8.4V of twice, maximum current is 1.05A for the loud speaker of 8ohm, so select the PPTC of Itrip=1A, operating resistance is less than 0.5ohm, loudness does not reduce and can be considered to can not influence loudness above 0.03dB, and the response time is preferably less than 0.1s.Practical application need be according to the demand of reality; voltage such as different supplying cells; the different impedances and the sensitivity of different loud speakers; at the loud speaker protection requirement different itself with people's ear safety; and different loudness loss requirement; calculate the current threshold, response time and the operating resistance that need restriction.
More than describe the running parameter of PPTC device in detail at mobile telephone system, those skilled in the art can recognize, can select the running parameter of corresponding PPTC device at specific application scenarios, make when running current, the normal sounding of the loud speaker of portable electric appts, and when abnormal current occurs, because the current limiting characteristic of PPTC self, thereby the electric current in device moment generation high resistant limiting loudspeaker loop.
It will be understood by those skilled in the art that Fig. 1 and Fig. 2 show in detail the particular location of PPTC device in circuit respectively, but this is not restrictive.In fact, the principle that everywhere equates according to series circuit current as long as the PPTC device is connected in the circuit, and need not specifically to limit the position of its concrete tie point.And, though the number of inductance is 2 among Fig. 1 and Fig. 2, for factors such as cost are considered, also can 1 of boil down to or cancellation inductance, even also can increase the number of inductance, the utility model to this and unrestricted.
Wherein, portable electric appts can be notebook computer, mobile phone, MP3 player, MP4 player, PDA(Personal Digital Assistant) or digital camera or the like.
In sum, in technique scheme, loud speaker and inductance are connected on the output of audio-frequency power amplifier, and PPTC device and loud speaker and inductance are connected in series.Therefore, when running current, the normal sounding of the loud speaker of portable electric appts, and when abnormal current occurs, because the current limiting characteristic of PPTC self, thereby the electric current in device moment generation high resistant limiting loudspeaker loop.Therefore, behind application the utility model, can limit foreseeable harmful acoustic pressure by the size of dysregulation electric current.Both can protect people's ear hearing; can limit the back flow current of portable electric appts loud speaker again; thereby protection loudspeaker device; also can not sacrifice existing portable electric appts speaker performance; the loud speaker operate as normal of portable electric appts when making normal current, and when abnormal current, play the effect of protecting loudspeaker device and people's ear.
And the utility model is structurally simple relatively, size is little, in light weight, therefore is applicable to most of portable electric appts, such as notebook computer, mobile phone, MP3 player, MP4 player or digital camera etc.
The above is the preferred embodiment of the utility model execution mode only, is not the protection range that is used to limit the utility model execution mode.All within the spirit and principle of the utility model execution mode, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model execution mode.
Claims (5)
1. a speaker system that is used for portable electric appts is characterized in that, comprise audio-frequency power amplifier, loud speaker, inductance and be used for when abnormal current occurs, rising positive temperature coefficient polymer (PPTC) device of metering function, wherein:
Loud speaker and inductance are connected on the output of audio-frequency power amplifier, and described PPTC device and loud speaker and inductance are connected in series.
2. the speaker system that is used for portable electric appts according to claim 1 is characterized in that, the output of described audio-frequency power amplifier is audio frequency power amplifier difference output end Vo+ and Vo-.
3. the speaker system that is used for portable electric appts according to claim 1 is characterized in that,
Described PPTC device is directly connected with the output of audio-frequency power amplifier, and inductance and loud speaker are connected in series with described PPTC device successively.
4. the speaker system that is used for portable electric appts according to claim 1 is characterized in that,
Described inductance is directly connected with the output of audio-frequency power amplifier, and PPTC device and loud speaker are connected in series with described inductance successively.
5. according to each described speaker system that is used for portable electric appts among the claim 1-4, it is characterized in that described portable electric appts is notebook computer, mobile phone, MP3 player, MP4 player, PDA(Personal Digital Assistant) or digital camera.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205612798U CN201821488U (en) | 2010-10-14 | 2010-10-14 | Speaker system used for portable electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205612798U CN201821488U (en) | 2010-10-14 | 2010-10-14 | Speaker system used for portable electronic equipment |
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| Publication Number | Publication Date |
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| CN201821488U true CN201821488U (en) | 2011-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010205612798U Expired - Fee Related CN201821488U (en) | 2010-10-14 | 2010-10-14 | Speaker system used for portable electronic equipment |
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| CN (1) | CN201821488U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780938A (en) * | 2012-06-06 | 2012-11-14 | 歌尔声学股份有限公司 | Bluetooth headset circuit board |
| CN103873990A (en) * | 2012-12-11 | 2014-06-18 | 联想(北京)有限公司 | Temperature control device and mobile terminal |
-
2010
- 2010-10-14 CN CN2010205612798U patent/CN201821488U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780938A (en) * | 2012-06-06 | 2012-11-14 | 歌尔声学股份有限公司 | Bluetooth headset circuit board |
| CN102780938B (en) * | 2012-06-06 | 2015-04-15 | 歌尔声学股份有限公司 | Bluetooth headset circuit board |
| CN103873990A (en) * | 2012-12-11 | 2014-06-18 | 联想(北京)有限公司 | Temperature control device and mobile terminal |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Beijing Qualsonic Technology Co. Ltd . Document name: Notification to Pay the Fees |
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| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Beijing Qualsonic Technology Co. Ltd . Document name: Notification of Termination of Patent Right |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110504 Termination date: 20181014 |