CN205407751U - Digital power amplifier of intelligence - Google Patents
Digital power amplifier of intelligence Download PDFInfo
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- CN205407751U CN205407751U CN201620157477.5U CN201620157477U CN205407751U CN 205407751 U CN205407751 U CN 205407751U CN 201620157477 U CN201620157477 U CN 201620157477U CN 205407751 U CN205407751 U CN 205407751U
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Abstract
The utility model relates to a digital power amplifier of intelligence, its characteristics are: be provided with the output of display screen, volume knob, analog audio input, digital audio input, power input and switch and analog audio and be connected with control circuit on the casing, control circuit is including the low pass filter and AD conversion module, signal selection module, digital signal receiver and conversion module, digital signal processing module, power amplification module, low pass filter module and the output module that connect gradually, power module in power input and the switch connection casing supplies power for control circuit, the display screen is connected with the interior display module of casing, and this display module is connected with digital signal processing module and power module. The utility model relates to a rationally, have high -fidelity, high efficiency, high overload capacity and high power reserve ability, the matching of power amplifier and speaker well, the audio -video has good positioning, update and upgrade is easy, production debugging convenience etc. Has wide market prospect.
Description
Technical field
This utility model belongs to communication broadcast power amplifier technology field, especially a kind of highly integrated intelligent digital power amplifier apparatus.
Background technology
Digital conversion technology is one of key areas of audio frequency development, has more the demand of being widely applied and powerful vitality compared with analog converting technology.Current audio-visual products (such as CD, LD, VCD, DVD, computer stereo, home theater etc.) and the audio power amplification system of communication product (such as mobile phone), particularly the traditional broadcast field such as railway, airport, market, building all adopts D/A converter technique, and it exists the problems such as distorted signals, efficiency is low, anti-interference is poor.
Summary of the invention
The purpose of this utility model is in that to overcome the deficiencies in the prior art, it is provided that a kind of reasonable in design, capacity of resisting disturbance is strong, efficiency of transmission is high and easy to maintenance intelligent digital power amplifier.
This utility model solves it and technical problem is that and take techniques below scheme to realize:
nullA kind of intelligent digital power amplifier，Control circuit including casing and inside thereof，Casing is provided with display screen、Volume knob、Analogue audio frequency inputs、DAB inputs、Power supply input and switch export with analogue audio frequency and are connected with control circuit，Described control circuit includes the low-pass filtering and the A/D modular converter that are sequentially connected with、Signal selection module、Digital signal reception and modular converter、Digital signal processing module、Power amplifier module、Low-pass filtering module and output module，The input of described power supply and switch connect the power module in casing and power for control circuit，Described low-pass filtering is connected with the analogue audio frequency input in casing with A/D modular converter，Described signal selection module is connected with the digital audio input in casing，Described output module exports with the analogue audio frequency in casing and is connected，Described display screen is connected with the display module in casing，This display module is connected with digital signal processing module and power module.
Being additionally provided with network communication interface in described casing, this network communication interface is connected with host computer and the duty of control circuit is uploaded to host computer.
Described volume knob, analogue audio frequency input, power supply inputs and switchs and analogue audio frequency output is two.
Described low-pass filtering and A/D modular converter are connected and composed by chip CS8402A and CS5390；Described signal selection module is made up of YM3623B chip, CS8412 chip, CS8414 chip or TDA1315 circuit；Described power amplifier module is made up of the D special full bridge driving circuit of class power amplifier and balanced bridge circuit；Described display module is made up of STM32 chip.
Described display screen is color LCD screen.
Advantage of the present utility model and having the benefit effect that
1, this utility model integration degree is high, and the intermodulation distortion of digital power amplifier, mismatch distortion and transient intermodulation are all little, solve multi-stage noise shaping technique, bit stream technology, CIRC decoding and correction process technology, interpolation and silence processing technology, oversampling digital filtering technique etc. problem, broadcasting power enlarging function requirement can not only be completed, and the broadcast component self can being monitored, it is ensured that real-time, stable professional audio transmission.
2, this utility model is provided with the digital power amplifier of two passages, and its casing rear board is provided with two road analogue audio frequency input interfaces, two railway digital audio input interfaces, two road audio output interfaces, two road power interfaces, a road network mouth；Simultaneously, casing front panel is provided with LCDs, two road volume adjustment knobs, it is possible to clearly in the duty of liquid crystal display screen display device, it is simple to the O&M of equipment, suitable in the specific communication messages system of railway, it is simple to commander's passenger traffic production task.
3, this utility model is reasonable in design, it is as the digital power amplifying system of a new generation's high-fidelity, low-power consumption, there is high-fidelity, high efficiency, high overload ability and high power reserve capabillity, the matching of power amplifier and speaker, Sound image localization is good, upgrading is easy, scheduling and planning is convenient, and matches with the development trend of following full digital audio broadcasting, high-definition television.Both existing CD player (or DVD player), DAT (digital audio tape), PCM (pulse code modulation recorder) can have been adopted as digital tone source, possesses again analogue audio frequency input interface, compatible existing simulation source of sound, therefore has wide market.
Accompanying drawing explanation
Fig. 1 is casing front panel schematic diagram of the present utility model；
Fig. 2 is casing rear board schematic diagram of the present utility model；
Fig. 3 is control circuit block diagram of the present utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model embodiment is further described:
A kind of intelligent digital power amplifier, is made up of the control circuit of casing and inside thereof, as it is shown in figure 1, be provided with color LCD screen 1, first passage volume knob 2, second channel volume knob 3 on the front panel of casing.As shown in Figure 2, the rear board of casing arranges first passage analogue audio frequency input 4, first passage DAB input 5, the input of first passage power supply and switch 6, first passage analogue audio frequency output 7, network communications port 8, second channel analogue audio frequency input 9, second channel DAB input 10, the input of second channel power supply and switch 11, second channel analogue audio frequency output 12, after can completing two road simulated audio signals or digital audio and video signals are carried out power amplification by above-mentioned standard interface, by the function that analogue audio frequency delivery outlet exports.
As it is shown on figure 3, the control circuit in casing includes low-pass filtering and A/D modular converter, signal selection module, digital signal reception and modular converter, digital signal processing module, power amplifier module, low-pass filtering module, output module, display module and power module.Power module is connected with the power supply input in casing and is connected on low-pass filtering and A/D modular converter, signal selection module, digital signal reception and modular converter, digital signal processing module, power amplifier module, low-pass filtering module, output module, display module is above-mentioned module for power supply, and described power module is mainly made up of Switching Power Supply.Described low-pass filtering and A/D modular converter, signal selection module, digital signal reception and modular converter, digital signal processing module, power amplifier module, low-pass filtering module and output module are sequentially connected and connect.Low-pass filtering is connected with the analogue audio frequency input in casing with A/D modular converter, permission analogue signal inputs, being encoded after low-pass filtering and A/D modular converter during analogue signal input, finally enter signal selection module, this function can be completed by chip CS8402A and CS5390.Signal selection module can complete the selection of many BIT digital signal, judgement, without signal, equipment can be driven to carry out dormancy by signal selection module；The many BIT digital audio and video signals chosen enters digital signal reception and change-over circuit module, complete functions such as digital audio and video signals BIT figure place identification (16BIT-24BIT), interface format identification, systematic sampling rate identification, coaxial composite audio digital signal conversion serial audio digital signals, this part is by chip YM3623B or similar chip CS8412, CS8414, TDA1315 circuit completes.Digital signal processing module mainly completes to convert many BIT signal to 1BIT signal, and exports with PWM form, and this circuit is the core of whole control circuit, and main employing chip SM5872 completes its function.Power amplifier module is another core of control circuit, adopts " the special full bridge driving circuit of D class power amplifier and balanced bridge circuit " to complete, and this circuit have employed burst pulse level shift technology, switching noise suppression technology and improves the technology of power bridge reliability.Low-pass filtering module adopts quadravalence Butterworth LPF, and for high power digital pulse signal is converted to simulated audio signal, the feature of Butterworth LPF is that inband flatness is high, so that output audio signal amplitude-frequency characteristic is better.Output module can realize the adjustment to output volume, and main connection exports audio amplifier.Display module adopts 1.8 cun of color LCD screen technology, chip STM32 drive.
nullWork process of the present utility model is as follows: when not having audio signal to input，Signal selection module drives intelligent power amplifier to enter resting state，When simulated audio signal is by casing rear board 4、9 are input to arriving signal after low-pass filtering and A/D module processing selects module，Or digital audio and video signals is by casing rear board 5、10 are directly inputted to signal selection module，Signal selection module completes the selection to multi-path digital signal，The multi-path digital audio signal chosen enters digital signal reception and change-over circuit module，Digital audio and video signals BIT figure place identification (16BIT-24BIT) is completed through digital signal reception and change-over circuit module、Interface format identification、Systematic sampling rate identification、Coaxial composite audio digital signal enters digital signal processing module after converting serial audio digital signal to，Digital signal processing module mainly completes to convert many BIT signal to 1BIT signal，And export power amplifier module with PWM form，Power amplifier module mainly completes power amplification function，Rear output is to low-pass filtering module，Low-pass filtering module completes digital pulse signal and is converted to simulated audio signal，And by the 7 of casing rear board、12 outputs；1 LCDs of casing front panel can show the work output state of first passage, second channel, including normal operation, fault, open circuit, short circuit etc., and can be uploaded to host computer by casing rear board 8 network communications port；The 2 of casing front panel, 3 is the volume output adjusting knob of first passage, second channel, scalable output volume；Casing rear board 6,11 is the power inlet of belt switch and insurance.
This utility model integration degree is high: the intermodulation distortion of digital power amplifier, mismatch distortion and transient intermodulation are all little: the transistor nonlinear characteristic when small area analysis can cause analog amplifier, and in the distortion of the positive and negative infall of output waveform, (transistor during small-signal can be operated in cut-off region, now no current passes through, cause output serious distortion) it is called that intermodulation distortion, intermodulation distortion are the born defects of analog amplifier；And digital power amplifier is only operated on off state, intermodulation distortion will not be produced.Analog amplifier exist recommend pipe characteristic inconsistent and cause the upper and lower asymmetric mismatch distortion of output waveform, therefore when designing push-pull amplifier circuit, the requirement of power tube is very strict, even so also may not accomplish full symmetric.And the pairing of digital power amplifier switch tube is without particular/special requirement, need not strictly mate；Analog amplifier, for ensureing its electroacoustic index, almost all adopts negative-feedback circuit without exception, in negative-feedback circuit, for suppressing unwanted oscillation, adopts phase compensating circuit, thus transient intermodulation can be produced.Digital power amplifier power change on without feedback circuit, thus avoiding transient intermodulation；High efficiency, up to 75%～95%: owing to digital power amplifier adopts switch amplifying circuit, ultrahigh in efficiency, up to 75%～95% (analog amplifier is typically only 30%～50%, even lower), operationally caloric value is very little, power device is all operated on off state, therefore it there is no that the static current consumption of analog amplifier, all energy are nearly all lay in for audio frequency output, and transient response is good；Overload capacity is strong with margin of power ability: the overload capacity of digital power amplifier circuit is significantly larger than analog amplifier, and analog amplifier is divided into a few class power amplification circuits such as A class, B class or AB class, and during normal operation, power tube is operated in linear zone；When, after overload, power tube is operated in saturation region, occurs cutting top distortion, and distortion exponentially increases, and tonequality degenerates rapidly.And digital power amplifier is constantly in saturation region and cut-off region when power amplification, as long as power tube does not damage, the distortion factor will not increase sharply；Matching of power amplifier and speaker: the power tube internal resistance owing to adopting in analog amplifier is relatively big, so when the speaker of the different resistance of coupling, the duty of analog amplifier circuit can be subject to the impact of load (speaker) size.And the output resistance of digital power amplifier is less than 0.2 ohm (internal resistance of switching tube adds wave filter internal resistance), it is negligible completely relative to the resistance (4～8 ohm) of load (speaker), is therefore not present in the matching problem of speaker；Sound image localization is good: for analog amplifier, be usually present phase contrast, and when output difference, phase distortion is also different between output signal and input signal.And digital power amplifier adopts and digital signal is amplified, making output signal completely the same with input signal, phase shift is zero, and therefore Sound image localization is accurate；Scheduling and planning is convenient: analog amplifier also exists the debugging problem of operating point at different levels, is unfavorable for producing in enormous quantities, and digital power amplifier major part is digital circuit, generally need not debug and get final product normal operation, is particularly suitable for large-scale production.
It is emphasized that; embodiment described in the utility model is illustrative; rather than it is determinate; therefore this utility model is not limited to the embodiment described in detailed description of the invention; every other embodiments drawn according to the technical solution of the utility model by those skilled in the art, also belong to the scope of this utility model protection.
Claims (5)
- null1. an intelligent digital power amplifier，Control circuit including casing and inside thereof，It is characterized in that: in casing, be provided with display screen、Volume knob、Analogue audio frequency inputs、DAB inputs、Power supply input and switch export with analogue audio frequency and are connected with control circuit，Described control circuit includes the low-pass filtering and the A/D modular converter that are sequentially connected with、Signal selection module、Digital signal reception and modular converter、Digital signal processing module、Power amplifier module、Low-pass filtering module and output module，The input of described power supply and switch connect the power module in casing and power for control circuit，Described low-pass filtering is connected with the analogue audio frequency input in casing with A/D modular converter，Described signal selection module is connected with the digital audio input in casing，Described output module exports with the analogue audio frequency in casing and is connected，Described display screen is connected with the display module in casing，This display module is connected with digital signal processing module and power module.
- 2. intelligent digital power amplifier according to claim 1, it is characterised in that: being additionally provided with network communication interface in described casing, this network communication interface is connected with host computer and the duty of control circuit is uploaded to host computer.
- 3. intelligent digital power amplifier according to claim 1, it is characterised in that: described volume knob, analogue audio frequency input, power supply inputs and switchs and analogue audio frequency output is two.
- 4. the intelligent digital power amplifier according to any one of claims 1 to 3, it is characterised in that: described low-pass filtering and A/D modular converter are connected and composed by chip CS8402A and CS5390；Described signal selection module is made up of YM3623B chip, CS8412 chip, CS8414 chip or TDA1315 circuit；Described power amplifier module is made up of the D special full bridge driving circuit of class power amplifier and balanced bridge circuit；Described display module is made up of STM32 chip.
- 5. the intelligent digital power amplifier according to any one of claims 1 to 3, it is characterised in that: described display screen is color LCD screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620157477.5U CN205407751U (en) | 2016-03-01 | 2016-03-01 | Digital power amplifier of intelligence |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620157477.5U CN205407751U (en) | 2016-03-01 | 2016-03-01 | Digital power amplifier of intelligence |
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| CN205407751U true CN205407751U (en) | 2016-07-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108834029A (en) * | 2018-08-11 | 2018-11-16 | 广东梦之音车载科技有限公司 | A kind of vehicle-mounted digital audio frequency power amplifier processor |
| CN113496715A (en) * | 2021-06-23 | 2021-10-12 | 南京纳特通信电子有限公司 | Intelligent power amplifier system and control method |
-
2016
- 2016-03-01 CN CN201620157477.5U patent/CN205407751U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108834029A (en) * | 2018-08-11 | 2018-11-16 | 广东梦之音车载科技有限公司 | A kind of vehicle-mounted digital audio frequency power amplifier processor |
| CN113496715A (en) * | 2021-06-23 | 2021-10-12 | 南京纳特通信电子有限公司 | Intelligent power amplifier system and control method |
| CN113496715B (en) * | 2021-06-23 | 2022-12-16 | 南京纳特通信电子有限公司 | Intelligent power amplifier system and control method |
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