CN202475370U - Intelligent monitoring and protecting system of large-power audio frequency amplifier - Google Patents
Intelligent monitoring and protecting system of large-power audio frequency amplifier Download PDFInfo
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- CN202475370U CN202475370U CN2011204593953U CN201120459395U CN202475370U CN 202475370 U CN202475370 U CN 202475370U CN 2011204593953 U CN2011204593953 U CN 2011204593953U CN 201120459395 U CN201120459395 U CN 201120459395U CN 202475370 U CN202475370 U CN 202475370U
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Abstract
The utility model provides an intelligent monitoring and protecting system of a large-power audio frequency amplifier, comprising an audio signal input circuit, an input level detection circuit, an electronic volume control circuit, a power amplification circuit and a microprocessor MCU. The input end of the input level detection circuit is connected to the output end of the audio signal input circuit, and the output end of the input level detection circuit is connected to the microprocessor MCU. The input end of the electronic volume control circuit is connected to the output end of the audio signal input circuit, and the output end is connected to the input end of the power amplification circuit through a signal buffer. The interface of the electronic volume control circuit is connected to the microprocessor MCU, and the output end of the power amplification circuit is connected to the output of a loudspeaker through a relay protection circuit. The intelligent monitoring and protecting system of a large-power audio frequency amplifier is advantageous in that various protection test points of the large-power audio frequency amplifier system are transmitted to the MCU through relevant matching circuits, and all the program control is completed by the MCU, and thereby the intelligent power amplifier protection system can be realized, and problems of a conventional large-power audio frequency amplifier on circuit protection can be resolved.
Description
Technical field
The utility model relates to the audio frequency amplifier field, relates in particular to a kind of intelligent monitoring protection system of high-power audio amplifier.
Background technology
The high-power audio amplifier is followed heating and reliability problems greatly because of its power output, and its important step is the various safeguard measures that are centered around high power amplifier circuit aspect.Traditional high-power audio amplifier starts to control a little short circuit overcurrent, output direct current offset, these several settings of temperature rising of power amplifier usually; When appearance is unusual; These parameters can surpass the circuit threshold values that sets; The state turnover of circuit after reaching threshold values is controlled corresponding circuit module, thereby plays the protected purpose of this part circuit.
But, the shortcoming of this mode: 1) circuit all operations under self closed loop state usually, when the parameter point of monitoring is a lot, can not draws these parameters one by one and monitor; 2) all be normative reference basically, can not carry out effective monitoring the continually varying important parameter with the threshold points; 3) complicated logical relation can not be constituted between the various protection settings, intelligent monitoring can not be accomplished; Need when 4) producing debugging simulate these parameter testings in advance one by one, waste time and energy, simultaneously when occur debugging and actual working state can't precisely judge when variant protective circuit normally whether; 5) variation correlation function that can not the real time record important parameter especially can not be done corresponding tracking when ageing prod.
Summary of the invention
The purpose of the utility model is to provide the intelligent monitoring protection system of high-power audio amplifier, to play the purpose to the circuit intelligent protection.
A kind of intelligent monitoring protection system of high-power audio amplifier; Comprise: audio signal input circuit, incoming level testing circuit, electronic sound volume control circuit, power amplification circuit and microprocessor MCU; Incoming level testing circuit input termination audio signal input circuit output; Incoming level testing circuit output termination microprocessor MCU, electronic sound volume control circuit input termination audio signal input circuit output, its output links to each other with the power amplification circuit input behind signal buffer; Electronic sound volume control circuit interface meets microprocessor MCU, and the power amplification circuit output connects loud speaker output through relay protection circuit.
Preferably; The input stage of said incoming level testing circuit is a balancing circuitry input stage of being made up of amplifier (U1A); The incoming level testing circuit is a kind of half-wave rectifying circuit, is made up of triode (Q1), diode (D1), is used to keep watch on the size of input signal and have or not.
Preferably, said power amplification circuit comprises: temperature sensing circuit, short-circuit protection circuits for triggering, said temperature sensing circuit, short-circuit protection circuits for triggering link to each other with microprocessor MCU respectively.
Preferably; Said temperature sensing circuit comprises amplifier (U2A), silicon diode (D100), resistance R 31 and diode D6; (D100) makees temperature sensor through silicon diode, utilizes the silicon diode temperature to rise, the characteristic that its saturation voltage drop reduces; Variable signal is added on amplification by the amplifier of forming with temperature with this again, and MCU reads by microprocessor.
Preferably; Said short-circuit protection circuits for triggering comprise: triode Q21, triode Q22, triode Q23, triode Q24, diode D11, diode D12, resistance R 29, resistance R 44, resistance R 45 and photoelectricity isolated tube (Q100); Said resistance R 29, resistance R 44, resistance R 45 are formed forward overcurrent sample circuit, served as flow out existing, triode Q21 conducting; And cause triode Q22, triode Q24 interlocking conducting simultaneously; Promote the output of level more respectively through diode D11 and diode D12 clamper power amplifier difference, make and be somebody's turn to do output, cause photoelectricity isolation coupling (Q100) to end output low level simultaneously and export microprocessor MCU to by restriction rapidly.
Preferably; This system also comprises the direct current offset testing circuit, the output of its input termination power amplification circuit, its output termination microprocessor MCU; Said direct current offset testing circuit comprises two-way threshold values comparator; Amplifier (U2B), when circuit skew exceeds the threshold values that sets, the single channel state turnover.
Preferably, this system also comprises the output level testing circuit, the output of its input termination power amplification circuit, its output termination microprocessor MCU.
Preferably, this system also comprises multistage air quantity fan control circuitry, control relay circuit, heat generating components temperature sensing circuit and the line voltage alarm detection circuit that links to each other with microprocessor MCU respectively.
Preferably, this system also comprises display control circuit and the remote communication interface that links to each other with microprocessor MCU.
The utility model compared with prior art; Beneficial effect is: the utility model is introduced singlechip microprocessor (MCU) in the high-power audio amplifier system; Give MCU the various protection test points of high-power audio amplifier system through relevant match circuit; All program control are accomplished by MCU fully, thereby realize intelligent power amplifier protection system, have overcome the problem of traditional high-power audio amplifier on protective circuit.
Description of drawings
Fig. 1 is the utility model system principle diagram.
Fig. 2 is the utility model incoming level measuring circuit figure.
Fig. 3 is the utility model temperature sensing circuit figure.
Fig. 4 is the utility model short-circuit protection circuits for triggering figure.
Fig. 5 is the utility model direct current offset testing circuit figure.
Fig. 6 is the multistage air quantity fan control circuitry of the utility model figure.
Fig. 7 is the utility model control relay circuit figure.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
See also shown in Figure 1; The intelligent monitoring protection system of the utility model high-power audio amplifier comprises: audio signal input circuit 101, incoming level testing circuit 102, electronic sound volume control circuit 103, microprocessor MCU 108; Incoming level testing circuit 102 input termination audio signal input circuits 101 outputs; Incoming level testing circuit 102 output termination microprocessor MCU 108; Electronic sound volume control circuit 103 input termination audio signal input circuits 101 outputs; Its output links to each other with power amplification circuit 104 inputs behind signal buffer, and electronic sound volume control circuit 103 interfaces meet microprocessor MCU 108, and power amplification circuit 104 outputs connect loud speaker output through relay protection circuit 107.
Wherein, the circuit diagram of incoming level testing circuit 102 is as shown in Figure 2, and the input stage of circuit is a balancing circuitry input stage of being made up of amplifier U1A, and level sensitive circuit is a kind of half-wave rectifying circuit, is made up of Q1, D1 etc.Be organized into direct current signal to audio signal, give MCU again and read its value with the audio signal size variation.The incoming level measurement has two effects, first keep watch on input signal size, have or not; Second controls the output volume that electronic sound volume control circuit 103 suitably reduces system when input signal is big, play the effect of similar amplitude limiter, prevents that the phenomenon of power amplifier overload from taking place.
Power amplification circuit 104 comprises: temperature sensing circuit, short-circuit protection circuits for triggering link to each other with microprocessor MCU 108 respectively, wherein; Temperature sensing circuit figure is as shown in Figure 3; D100 makees temperature sensor with silicon diode, utilizes the silicon diode temperature to rise, the characteristic that its saturation voltage drop reduces; Variable signal is added on amplification by the amplifier that U2A forms with temperature with this again, is read by MCU.R31 in the circuit and D6 are MCU port protection circuit.When MCU detects temperature when higher, at first start or strengthen the air quantity of radiator fan, raise if still continue temperature, will suitably lower system's output volume through electronic sound volume control circuit 103; Temperature raises will cut off the output of power amplifier under the extremity.
Wherein, figure is as shown in Figure 4 for the short-circuit protection circuits for triggering, and this circuit is used for protecting power tube; Circuit is had relatively high expectations to transient response, otherwise does not have the effect of protection power tube, and therefore inside circuit self limits its output on the one hand when over-current phenomenon avoidance occurring; R29, R31, R44, R45 form forward overcurrent sample circuit in circuit, in case the Q21 conducting appears in overcurrent; And cause Q22, Q24 interlocking conducting simultaneously; Promote the output of level more respectively through D11 and D12 clamper power amplifier difference, this level is exported by restriction rapidly, the situation of reverse overcurrent restriction and above-mentioned similar.Deliver to MCU to the over-current state signal through Signal Spacing Q100 on the other hand; Suitably reduce system's output volume (through the electronic sound volume control circuit) according to the order of severity of short circuit again by MCU, continue to cut off under the extremity of serious overcurrent the output of power amplifier.
This system also comprises direct current offset testing circuit 105, the output of its input termination power amplification circuit, its output termination microprocessor MCU 108; The circuit diagram of direct current offset testing circuit 105 is as shown in Figure 5, and this circuit is a two-way threshold values comparator, is made up of elements such as amplifier U2B; When circuit skew exceeded the threshold values that sets, the circuit state upset was among the figure; Forward and reverse threshold values is respectively by R15, R16 and R17, R18 decision; In case shift phenomenon occurs, U2B is turned to high level from low level, and R19, D3 are MCU port protection circuit.MCU can judge whether to cut off power amplifier output according to the conditions such as signal magnitude of power take-off after detecting direct current offset, can cut off power amplifier output under the extreme case.
This system also comprises output level testing circuit 106; The output of its input termination power amplification circuit; Its output termination microprocessor MCU 108; Output level testing circuit 106 is identical with incoming level testing circuit 102 circuit, after MCU reads this value, can show the output situation of power amplifier in real time.
This system also comprises multistage air quantity fan control circuitry 109, control relay circuit 110, heat generating components temperature sensing circuit 111 and the line voltage alarm detection circuit 112 that links to each other with microprocessor MCU 108 respectively.
In the system; The heat generating components temperature sensing circuit 111 that device comprised like easy heating such as power transformer, rectified power pipe; Testing circuit is identical with temperature sensing circuit Fig. 3 with transducer, and the device of easy heating is set monitor protection, and whole system is comprehensively protected.
The line voltage alarm detection circuit 112 that power amplification system uses, by the electric main fluctuation that the external world causes, MCU only need detect the transformer secondary output supply voltage and can realize.When the input AC line voltage occurring when too high or too low, stop the operate as normal of this power amplification system, and carry out alarm through display; Another aspect; Owing to be the secondary power magnitude of voltage that detects after transformer transmits, reflect the electric main input status under system's zero load basically, and under oepration at full load, can be dragged down voltage; Therefore the utility model system can detection system the rate of change of voltage under the unloaded and loaded situation of system, the synthetic load situation of coming the approximate estimation system.
Multistage air quantity fan control circuitry 109 is as shown in Figure 6; MCU will judge and the consideration discharge quantity of fan according to the size of device temperature and output state is comprehensive; Should guarantee effective heat radiation, the peace and quiet when accomplishing to export small volume again (volume comparatively hour, will suitably reduce air quantity of fan).
Control relay circuit 110 is as shown in Figure 7; Except when system occurs unusually; Be used for cutting off outside the work of complete machine; Also states such as switching on and shutting down impact, standby are controlled, R147, R148, C92 form delay circuit among the figure, and MCU mouth line can be controlled all relay power supplies through Q17.
Microprocessor MCU 108 is a typical processor of single chip computer system; Circuit has the multi-analog input and detects, and can measure continuous signal magnitude, can show all information as required simultaneously; Because MCU software control characteristic; Be comprehensive, intelligence in system, the protection timeliness of bring to power amplifier greatly has essential lifting thereby compare with traditional power amplifier protective circuit.
This system also comprises display control circuit 114 and the remote communication interface 115 that links to each other with microprocessor MCU 108.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (9)
1. the intelligent monitoring protection system of a high-power audio amplifier; It is characterized in that; Comprise: audio signal input circuit, incoming level testing circuit, electronic sound volume control circuit, power amplification circuit and microprocessor (MCU); Incoming level testing circuit input termination audio signal input circuit output; Incoming level testing circuit output termination microprocessor (MCU), electronic sound volume control circuit input termination audio signal input circuit output, its output links to each other with the power amplification circuit input behind signal buffer; Electronic sound volume control circuit interface connects microprocessor (MCU), and the power amplification circuit output connects loud speaker output through relay protection circuit.
2. the intelligent monitoring protection system of high-power audio amplifier as claimed in claim 1; It is characterized in that; The input stage of said incoming level testing circuit is a balancing circuitry input stage of being made up of amplifier (U1A); The incoming level testing circuit is a kind of half-wave rectifying circuit, is made up of triode (Q1), diode (D1), is used to keep watch on the size of input signal and have or not.
3. the intelligent monitoring protection system of high-power audio amplifier as claimed in claim 1; It is characterized in that; Said power amplification circuit comprises: temperature sensing circuit, short-circuit protection circuits for triggering, said temperature sensing circuit, short-circuit protection circuits for triggering link to each other with microprocessor (MCU) respectively.
4. the intelligent monitoring protection system of high-power audio amplifier as claimed in claim 3; It is characterized in that said temperature sensing circuit comprises amplifier (U2A), silicon diode (D100), resistance (R31) and diode (D6), (D100) makees temperature sensor through silicon diode; Utilize the silicon diode temperature to rise; The characteristic that its saturation voltage drop reduces, variable signal is added on amplification by the amplifier of forming with temperature with this again, and (MCU) reads by microprocessor.
5. the intelligent monitoring protection system of high-power audio amplifier as claimed in claim 3; It is characterized in that; Said short-circuit protection circuits for triggering comprise: triode (Q21), triode (Q22), triode (Q23), triode (Q24), diode (D11), diode (D12), resistance (R29), resistance (R44), resistance (R45) and photoelectricity isolated tube (Q100) are formed; Said resistance (R29), resistance (R44), resistance (R45) are formed forward overcurrent sample circuit; Served as and flowed out at present; Triode (Q21) conducting, and cause triode (Q22), triode (Q24) interlocking conducting simultaneously, promote the output of level more respectively through diode (D11) and diode (D12) clamper power amplifier difference; Make and to export, cause photoelectricity isolation coupling (Q100) to export microprocessor (MCU) to simultaneously by output low level by restriction rapidly.
6. the intelligent monitoring protection system of high-power audio amplifier as claimed in claim 1 is characterized in that this system also comprises the direct current offset testing circuit; The output of its input termination power amplification circuit; It exports termination microprocessor (MCU), and said direct current offset testing circuit comprises two-way threshold values comparator, amplifier (U2B); When circuit skew exceeds the threshold values that sets, the single channel state turnover.
7. the intelligent monitoring protection system of high-power audio amplifier as claimed in claim 1 is characterized in that this system also comprises the output level testing circuit, the output of its input termination power amplification circuit, and it exports termination microprocessor (MCU).
8. the intelligent monitoring protection system of high-power audio amplifier as claimed in claim 1; It is characterized in that this system also comprises multistage air quantity fan control circuitry, control relay circuit, heat generating components temperature sensing circuit and the line voltage alarm detection circuit that links to each other with microprocessor (MCU) respectively.
9. the intelligent monitoring protection system of high-power audio amplifier as claimed in claim 1 is characterized in that, this system also comprises display control circuit and the remote communication interface that links to each other with microprocessor (MCU).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204593953U CN202475370U (en) | 2011-11-18 | 2011-11-18 | Intelligent monitoring and protecting system of large-power audio frequency amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204593953U CN202475370U (en) | 2011-11-18 | 2011-11-18 | Intelligent monitoring and protecting system of large-power audio frequency amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN202475370U true CN202475370U (en) | 2012-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204593953U Expired - Lifetime CN202475370U (en) | 2011-11-18 | 2011-11-18 | Intelligent monitoring and protecting system of large-power audio frequency amplifier |
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| CN (1) | CN202475370U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915186A (en) * | 2016-04-11 | 2016-08-31 | 延锋伟世通汽车电子有限公司 | Audio detection control and diagnosis circuit |
| CN109141535A (en) * | 2018-10-15 | 2019-01-04 | 广州市浩翔计算机科技有限公司 | A kind of audio frequency apparatus multifunction monitoring system |
| CN112185322A (en) * | 2019-07-01 | 2021-01-05 | 抚顺革尔电声科技有限公司 | Dynamic controller |
-
2011
- 2011-11-18 CN CN2011204593953U patent/CN202475370U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915186A (en) * | 2016-04-11 | 2016-08-31 | 延锋伟世通汽车电子有限公司 | Audio detection control and diagnosis circuit |
| CN105915186B (en) * | 2016-04-11 | 2023-03-24 | 延锋伟世通汽车电子有限公司 | Audio detection control and diagnostic circuit |
| CN109141535A (en) * | 2018-10-15 | 2019-01-04 | 广州市浩翔计算机科技有限公司 | A kind of audio frequency apparatus multifunction monitoring system |
| CN112185322A (en) * | 2019-07-01 | 2021-01-05 | 抚顺革尔电声科技有限公司 | Dynamic controller |
| CN112185322B (en) * | 2019-07-01 | 2024-02-02 | 抚顺革尔电声科技有限公司 | Dynamic controller |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121003 |
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| CX01 | Expiry of patent term |