CN103812092B - A kind of protection circuit that loudspeaker are exported for high-power audio - Google Patents
A kind of protection circuit that loudspeaker are exported for high-power audio Download PDFInfo
- Publication number
- CN103812092B CN103812092B CN201410064298.2A CN201410064298A CN103812092B CN 103812092 B CN103812092 B CN 103812092B CN 201410064298 A CN201410064298 A CN 201410064298A CN 103812092 B CN103812092 B CN 103812092B
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- pin
- resistance
- power amplifier
- audio frequency
- loudspeaker
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/007—Protection circuits for transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/06—Arranging circuit leads; Relieving strain on circuit leads
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R27/00—Public address systems
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of protection circuit that loudspeaker are exported for high-power audio, including：Audio frequency power amplifier protects the second pin of chip, the first relay to connect the first input end of loudspeaker, and the 4th pin of the first relay connects the 6th resistance and the 7th resistance respectively, and the 6th resistance connection audio frequency power amplifier protects the 7th pin of chip；4th pin of audio frequency power amplifier protection chip connects the positive pole of the 4th resistance and the second electric capacity respectively, and the 4th resistance connects the negative electrode of diode, the anode input ac voltage 25V of diode；6th pin of audio frequency power amplifier protection chip connects the 4th pin and the negative electrode of malfunction indicator lamp of the second relay respectively by the 5th resistance, and the anode of malfunction indicator lamp connects the 7th resistance；First pin of the second relay connects the 4th input of loudspeaker, and second pin connects the 3rd input of loudspeaker.Loss is reduced by the protection circuit, it is to avoid fire, it is ensured that safety, meet the various needs in practical application.
Description
Technical field
The present invention relates to high-power audio output loudspeaker, more particularly to a kind of protection that loudspeaker are exported for high-power audio
Circuit.
Background technology
Audio frequency Jing after power amplifier amplification can export high-power audio, puncture the audio frequency in audio power amplifier circuit sometimes
Power amplifier protects chip, after the breakdown damage of audio frequency power amplifier protection chip, when the DC current of output flows through the voice coil loudspeaker voice coil of loudspeaker, gently
Person can produce fixed magnetic field, shift voice coil loudspeaker voice coil, it is difficult to recover, and severe one can be burnt.In addition, in the especially big power amplifier in part, by
It is very big in output, when user operation not at that time, may persistently export several amperes even more than ten amperes of peak point current,
The rated output power of the peak power output of the sound channel considerably beyond power amplifier is made, causes loudspeaker to burn, may be produced when serious
Light a fire calamity.
The content of the invention
The invention provides a kind of protection circuit that loudspeaker are exported for high-power audio, is avoided by the protection circuit
When audio power amplifier circuit chip is breakdown, loudspeaker are in state is burnt, described below：
A kind of protection circuit that loudspeaker are exported for high-power audio, the protection circuit include：Audio frequency power amplifier protects core
Piece, the second pin of audio frequency power amplifier protection chip connect the positive pole of the first electric capacity, first resistor, second resistance and the respectively
Three resistance；
The first resistor connects the second input of first pin and loudspeaker of the first relay respectively, described first after
The second pin of electrical equipment connects the first input end of loudspeaker, and the 4th pin of first relay connects the 6th resistance and respectively
Seven resistance, the 6th resistance connect the 7th pin that the audio frequency power amplifier protects chip, and described by the connection of the 8th resistance
Audio frequency power amplifier protects the 8th pin of chip；4th pin of audio frequency power amplifier protection chip connects the 4th resistance and the respectively
The positive pole of two electric capacity, the 4th resistance connect the negative electrode of diode, the anode input ac voltage 25V of the diode；
6th pin of the audio frequency power amplifier protection chip connects the 4th of the second relay respectively by the 5th resistance and draws
The negative electrode of foot and malfunction indicator lamp, the anode of the malfunction indicator lamp connect the 7th resistance；First pin of second relay
Connection loudspeaker the 4th input, second pin connect loudspeaker the 3rd input, first relay and described second after
5th pin of electrical equipment meets input voltage VCC；
3rd pin and the 7th pin of the audio frequency power amplifier protection chip is connect by the 4th electric capacity and the 3rd electric capacity respectively
Ground, the first pin ground connection of the audio frequency power amplifier protection chip.
The audio frequency power amplifier protects model C1237 of chip.The alternating voltage 25V is produced by external inverter.
The input voltage VCC is produced by rectifier circuit.
The first resistor is release resistance；4th resistance is divider resistance；6th resistance and the described 8th
Resistance is sampling resistor.
First electric capacity, second electric capacity, the 3rd electric capacity are filter capacitor.
The beneficial effect of technical scheme that the present invention is provided is：The protection circuit is by protecting chip to puncture audio frequency power amplifier
The high current that moment produces afterwards is detected, after detecting, by the first relay, the second relay moment by power amplifier
Disconnect, power amplifier does not have electric current to flow through, and loudspeaker quit work, thus play a part of to protect loudspeaker, reduce loss, keep away
Exempt from fire, it is ensured that safety, meet the various needs in practical application.
Description of the drawings
Fig. 1 is a kind of schematic diagram of the protection circuit that loudspeaker are exported for high-power audio；
Schematic diagrams of the Fig. 2 for power supply circuits.
In accompanying drawing, the list of parts representated by each label is as follows：
CON8：Audio frequency power amplifier protects chip； VCC：Input voltage；
C34：First electric capacity； C35：Second electric capacity；
C36：3rd electric capacity； C37：4th electric capacity；
R41：First resistor； R42：Second resistance；
R43：3rd resistor； R44：4th resistance；
R45：5th resistance； R46：6th resistance；
R47：7th resistance； R48：8th resistance；
K3：First relay； K4：Second relay；
SPK/1：First input end； SPK/2：Second input；
SPK/3：3rd input； SPK/4：4th input；
D7：Diode； LED1：Malfunction indicator lamp；
BRGIDGE2：Rectifier circuit.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, further is made to embodiment of the present invention below
Ground is described in detail.
In order to avoid when audio power amplifier circuit chip is breakdown, loudspeaker are provided in state of burning, the embodiment of the present invention
A kind of protection circuit that loudspeaker are exported for high-power audio, it is referring to Fig. 1 and Fig. 2, described below：
The protection circuit includes：Audio frequency power amplifier protects chip CON8, the second pin point of audio frequency power amplifier protection chip CON8
Do not connect positive pole, first resistor R41, second resistance R42 and 3rd resistor R43 of the first electric capacity C34, second resistance R42 and
The minus earth of one electric capacity C34；First resistor R41 connects the second input of first pin and loudspeaker of the first relay K3 respectively
End SPK/2, the second pin of the first relay K3 connect the first input end SPK/1 of loudspeaker, the 4th pin of the first relay K3
Connect the 6th resistance R46 and the 7th resistance R47 respectively, the 7th of the 6th resistance R46 connection audio frequency power amplifier protection chip CON8 draws
Foot, and the 8th pin that audio frequency power amplifier protects chip CON8 is connected by the 8th resistance R48；Audio frequency power amplifier protection chip CON8's
4th pin connects the positive pole of the 4th resistance R44 and the second electric capacity C35 respectively, and the 4th resistance R44 connects the negative electrode of diode D7,
The anode of diode D7 connects input ac voltage 25V, and the minus earth of the second electric capacity C35；Audio frequency power amplifier protects chip CON8
The 6th pin by the 5th resistance R45 connect respectively the second relay K4 the 4th pin and malfunction indicator lamp LED1 the moon
Pole, the anode of malfunction indicator lamp LED1 meet the 7th resistance R47；4th input of the first pin connection loudspeaker of the second relay K4
End SPK/4, the 5th of the 3rd input SPK/3, the first relay K3 and the second relay K4 of second pin connection loudspeaker draws
Foot meets input voltage VCC；3rd pin and the 7th pin of audio frequency power amplifier protection chip CON8 passes through the 4th electric capacity C37 respectively
It is grounded with the 3rd electric capacity C36, the first pin ground connection of audio frequency power amplifier protection chip CON8.
During practical application, the model of audio frequency power amplifier protection chip CON8 is preferably C1237, and this kind of chip can be by detection
Change in voltage moment amplifies and drives relay to work, and is effectively protected loudspeaker and is not burned out, and when implementing, can also select
The chip of other models is selected, the embodiment of the present invention is not restricted to this.
Wherein, first resistor R41 for release resistance, the 4th resistance R44 be divider resistance, the 6th resistance R46, the 8th resistance
R48 is sampling resistor.First electric capacity C34, the second electric capacity C35, the 3rd electric capacity C36 are filter capacitor.
Referring to Fig. 2, the 25V AC-input voltages connect by the anode of diode D7 are produced by external inverter, first after
The input voltage VCC connect by 5th pin of electrical equipment K3 and the second relay K4 is produced by rectifier circuit BRGIDGE2, rectification
First, the 3rd pin of bridge circuit BRGIDGE2 is ac input end, and input voltage is the 25V alternating currents from inverter output,
25V alternating currents i.e. in protection circuit are provided by the 3rd pin of rectifier circuit BRGIDGE2（25V alternating currents are via diode
D7, the 4th resistance R44 and the 5th filter capacitor C35 provide running voltage to audio frequency power amplifier protection chip CON8）, in protection circuit
Input voltage VCC and sampling comparison voltage by rectifier circuit BRGIDGE2 second pin provide.
The operation principle of the protection circuit is as follows：When audio frequency power amplifier protection chip CON8 is working properly, the first relay K3,
Second relay K4 does not work, 1 foot -2 foot and first of second input SPK/2 one end of loudspeaker through the first relay K3
Input SPK/1 is closed, first via loudspeaker normal work, and the second input SPK/2 of loudspeaker is via first resistor R41 and audio frequency
The second pin of power amplifier protection chip CON8 is connected, and detects that audio frequency power amplifier protects the change in voltage of chip CON8.Work as audio frequency power amplifier
When protection chip CON8 is breakdown, the second input SPK/2 short circuit groundings of loudspeaker, voltage is zero, and first resistor R41 is by signal
It is sent to the second pin that audio frequency power amplifier protects chip CON8, audio frequency power amplifier protection chip CON8 work, audio frequency power amplifier protection core
The 6th pin conducting ground connection of piece CON8, earth terminal control the first relay K3, the second relay K4 through the 5th resistance R45 and lead
Logical work（Input voltage VCC+ is via the 7th resistance R47, malfunction indicator lamp LED1 to the second relay end, malfunction indicator lamp
LED1 is bright, illustrates that circuit is faulty）, first input end, the second input SPK/1 and SPK/2 are disconnected so that loudspeaker disconnect not
Work, is protected.As the first via, input is respectively the inputs of the 3rd input SPK/3 and the 4th to another road operation principle
End SPK/4, turns on via first pin of the second relay K4, second pin during normal work, and the 4th input SPK/4's is another
The second pin input of chip CON8 is protected via 3rd resistor R43 and audio frequency power amplifier in one end.
In sum, the embodiment of the present invention punctures the high current of rear moment generation by chip CON8 is protected to audio frequency power amplifier
Detected, after detecting, power amplifier is disconnected by the first relay K3, the second relay K4 moments, power amplifier
Flow through without electric current, loudspeaker quit work, thus play a part of to protect loudspeaker.
To the model of each device in addition to specified otherwise is done, the model of other devices is not limited the embodiment of the present invention,
As long as the device of above-mentioned functions can be completed.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the embodiments of the present invention
Sequence number is for illustration only, does not represent the quality of embodiment.
The foregoing is only presently preferred embodiments of the present invention, not to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (5)
1. a kind of protection circuit that loudspeaker are exported for high-power audio, the protection circuit includes：Audio frequency power amplifier protects chip,
Characterized in that, the second pin of audio frequency power amplifier protection chip connect respectively the positive pole of the first electric capacity, first resistor, second
Resistance and 3rd resistor；
The first resistor connects the second input of first pin and loudspeaker of the first relay, first relay respectively
Second pin connect the first input end of loudspeaker, the 4th pin of first relay connects the 6th resistance and the 7th electric respectively
Resistance, the 6th resistance connect the 7th pin that the audio frequency power amplifier protects chip, and connect the audio frequency by the 8th resistance
Power amplifier protects the 8th pin of chip；4th pin of audio frequency power amplifier protection chip connects the 4th resistance and second electric respectively
The positive pole of appearance, the 4th resistance connect the negative electrode of diode, the anode input ac voltage 25V of the diode；
6th pin of audio frequency power amplifier protection chip by the 5th resistance connect respectively the second relay the 4th pin and
The negative electrode of malfunction indicator lamp, the anode of the malfunction indicator lamp connect the 7th resistance；The first pin connection of second relay
4th input of loudspeaker, second pin connect the 3rd input of loudspeaker, first relay and second relay
The 5th pin meet input voltage VCC；
3rd pin and the 7th pin of the audio frequency power amplifier protection chip passes through the 4th electric capacity and the 3rd capacity earth, institute respectively
State the first pin ground connection of audio frequency power amplifier protection chip；
When audio frequency power amplifier protection chip operation is normal, the first relay, the second relay do not work, the second input Jing of loudspeaker
Cross the first relay to close with first input end, first via loudspeaker normal work, the second input of loudspeaker is via first resistor
Protect with audio frequency power amplifier the second pin of chip to be connected, detect that audio frequency power amplifier protects the change in voltage of chip；
When audio frequency power amplifier protection chip is breakdown, the second input short circuit grounding of loudspeaker, voltage is zero, and first resistor will be believed
Number it is sent to the second pin that audio frequency power amplifier protects chip, audio frequency power amplifier protection chip operation, the of audio frequency power amplifier protection chip
Six pins conducting ground connection, earth terminal control the first relay, the second relay ON operation through the 5th resistance, by the first input
End, the second input disconnect so that loudspeaker disconnect and not working, and are protected；
As the first via, input is respectively the 3rd input and the 4th input to another road operation principle, during normal work
Turn on via the first pin of the second relay, second pin, the other end of the 4th input is via 3rd resistor and audio frequency work(
Put the second pin input of protection chip；
The audio frequency power amplifier protects model C1237 of chip.
2. it is according to claim 1 it is a kind of for high-power audio export loudspeaker protection circuit, it is characterised in that it is described
Alternating voltage 25V is produced by external inverter.
3. it is according to claim 1 it is a kind of for high-power audio export loudspeaker protection circuit, it is characterised in that it is described
Input voltage VCC is produced by rectifier circuit.
4. it is according to claim 1 it is a kind of for high-power audio export loudspeaker protection circuit, it is characterised in that it is described
First resistor is release resistance；4th resistance is divider resistance；6th resistance is sampling electricity with the 8th resistance
Resistance.
5. it is according to claim 1 it is a kind of for high-power audio export loudspeaker protection circuit, it is characterised in that it is described
First electric capacity, second electric capacity, the 3rd electric capacity are filter capacitor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410064298.2A CN103812092B (en) | 2014-02-25 | 2014-02-25 | A kind of protection circuit that loudspeaker are exported for high-power audio |
| KR20140037883A KR101488238B1 (en) | 2014-02-25 | 2014-03-31 | Protection circuit for high-performance audio output loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410064298.2A CN103812092B (en) | 2014-02-25 | 2014-02-25 | A kind of protection circuit that loudspeaker are exported for high-power audio |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103812092A CN103812092A (en) | 2014-05-21 |
| CN103812092B true CN103812092B (en) | 2017-04-05 |
Family
ID=50708479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410064298.2A Active CN103812092B (en) | 2014-02-25 | 2014-02-25 | A kind of protection circuit that loudspeaker are exported for high-power audio |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR101488238B1 (en) |
| CN (1) | CN103812092B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109947171B (en) * | 2019-05-10 | 2024-07-05 | 济南铂晶电子科技有限公司 | Portable alternating current constant current source powered by rechargeable battery |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR900006373Y1 (en) * | 1986-12-30 | 1990-07-16 | 삼성전자 주식회사 | The protection device for speak and power amplifier |
| JPH0654997B2 (en) * | 1988-06-01 | 1994-07-20 | ヤマハ株式会社 | Amplifier protection circuit |
| JP3127813B2 (en) * | 1995-12-05 | 2001-01-29 | ヤマハ株式会社 | Audio amplifier protection circuit |
| US20060146462A1 (en) * | 2005-01-04 | 2006-07-06 | Andy Hines | Enhanced safety stop device for pools and spas |
| CN2845351Y (en) * | 2005-12-07 | 2006-12-06 | 海信集团有限公司 | Set-top box with audio power amplifying circuit inside |
| JP4916478B2 (en) * | 2008-04-30 | 2012-04-11 | ティーオーエー株式会社 | Audio amplifier |
| CN202696548U (en) * | 2012-05-22 | 2013-01-23 | 天津市畅悦电子科技有限公司 | Power amplification circuit |
| CN203787948U (en) * | 2014-02-25 | 2014-08-20 | 天津市畅悦电子科技有限公司 | Protection circuit used for large power audio output horn |
-
2014
- 2014-02-25 CN CN201410064298.2A patent/CN103812092B/en active Active
- 2014-03-31 KR KR20140037883A patent/KR101488238B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CN103812092A (en) | 2014-05-21 |
| KR101488238B1 (en) | 2015-02-04 |
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Address after: 300000 room 5018, block A, 2 Wuhua Road, Huayuan Industrial Zone, Binhai New Area, Tianjin. Patentee after: Tianjin Chang Yue electronic Polytron Technologies Inc Address before: 300000 Nankai District Huayuan Industrial Zone of Tianjin City Road No. 2 Haitai torch Pioneering Park A block, room 5018 Patentee before: Tianjin Changyue Electronic Science and Technology Co., Ltd. |