CN201490975U - Digital power amplifier - Google Patents
Digital power amplifier Download PDFInfo
- Publication number
- CN201490975U CN201490975U CN2009200565815U CN200920056581U CN201490975U CN 201490975 U CN201490975 U CN 201490975U CN 2009200565815 U CN2009200565815 U CN 2009200565815U CN 200920056581 U CN200920056581 U CN 200920056581U CN 201490975 U CN201490975 U CN 201490975U
- Authority
- CN
- China
- Prior art keywords
- circuit
- power amplifier
- output
- digital
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model discloses a digital power amplifier, which comprises a signal input end, a power amplification circuit, a signal output end and a power supply, wherein the signal input end, the power amplification circuit, the signal output end and the power supply are connected according to a certain relationship. A gain control circuit, a pulse width modulation circuit, a grid driving circuit, a low-pass filter circuit, a start mute and protection circuit, an overheating detection circuit, an overcurrent detection circuit and a current comparison circuit are arranged on the digital power amplifier in a sequentially connecting way. The digital power amplifier is an audio signal power amplifier produced on the basis of pulse modulation technology and has the advantages of small volume, light weight, complete functions, high efficiency, energy saving, environmental protection, high cost performance, convenient use and easy popularization. The digital power amplifier can be used in places such as digital cinemas, digital audio entertainment places, family digital sound and the like, can conduct digitalized processing and transmission to all kinds of sound sources of different formats, can realize no loss transmission of audio signals and can reproduce the vividness of sound fields, so the needs of vast users are satisfied.
Description
Technical field
The utility model relates to the amplifier technical field, particularly a kind of digital movie institute, digital audio public place of entertainment place such as family digital sound equipment in one's power that is used in, be used for the source of sound of different-format is carried out digitized processing and transmission, and to the digital power amplifier of audio frequency reproduction true to nature.
Background technology
Power amplifier can be used for small-signal is amplified, and is a kind of important electron element.The history of power amplifier can be related the electron tube power amplifier of early sixties, until to sixties end, popularizes along with transistorized, and transistor power amplifier begins to put goods on the market, and is leveraged to the present always.Traditional transistor power amplifier is a kind of analog signal amplifier, its volume and weight are big, power consumption is big, the effective power conversion efficiency is low, can make troubles to the user, therefore, people did not stop the research of power amplifier a moment yet, new technology, new components and parts, new circuit constantly occurs, the digital power amplifier of a new generation also moves towards market gradually, yet, also there is not a kind of function in the market more comprehensively at digital movie institute, the digital audio public place of entertainment is the digital power amplifier that provides of place such as family digital sound equipment in one's power, the digital power amplifier that is used in these fields often structure is complicated, function is perfect inadequately, and cost an arm and a leg, be unfavorable for the penetration and promotion of product.
Summary of the invention
The purpose of this utility model is to provide a kind of digital movie institute, digital audio public place of entertainment digital power amplifier of family digital sound equipment in one's power that is used in.
The utility model is that the technical scheme that its technical problem of solution is adopted is:
A kind of digital power amplifier, comprise signal input part, power amplification circuit, signal output part and power supply, it is characterized in that: described digital power amplifier is provided with gain control circuit, pulse-width modulation circuit, gate driver circuit, low-pass filter circuit, start dumb sound and protective circuit, overheating detection circuit, over-current detection circuit and current comparison circuit;
The input of described gain control circuit connects signal input part, and output connects the input of pulse-width modulation circuit;
The output of described pulse-width modulation circuit connects the input of gate driver circuit;
The output of described gate driver circuit connects the input of power amplification circuit;
The input of described low-pass filter circuit connects the output of power amplification circuit, and output connects the input of start dumb sound and protective circuit;
The output of described start dumb sound and protective circuit connects signal output part;
The output of described overheating detection circuit connects start dumb sound and protective circuit;
The input of described over-current detection circuit connects the output of low-pass filter circuit, and output connects the input of current comparison circuit;
The output of described current comparison circuit connects gain control circuit.
The beneficial effects of the utility model are: the utility model digital power amplifier is a kind of audio power amplifier of producing based on pulse modulation technique, its volume is little, in light weight, multiple functional, energy-efficient, environment-friendly type, high and convenient use of cost performance, help penetration and promotion, the utility model can be used in digital movie institute, the digital audio public place of entertainment is occasion such as family digital sound equipment in one's power, can carry out digitized processing and transmission to the source of sound of various different-formats, realize audio signal free of losses transmission, reproduce the sense true to nature of sound field, satisfied numerous users' demand.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples:
Fig. 1 is a theory diagram of the present utility model.
Embodiment
With reference to Fig. 1, a kind of digital power amplifier, comprise signal input part, power amplification circuit, signal output part and power supply, it is characterized in that: described digital power amplifier is provided with gain control circuit, pulse-width modulation circuit, gate driver circuit, low-pass filter circuit, start dumb sound and protective circuit, overheating detection circuit, over-current detection circuit and current comparison circuit;
The input of described gain control circuit connects signal input part, and output connects the input of pulse-width modulation circuit;
The output of described pulse-width modulation circuit connects the input of gate driver circuit;
The output of described gate driver circuit connects the input of power amplification circuit;
The input of described low-pass filter circuit connects the output of power amplification circuit, and output connects the input of start dumb sound and protective circuit;
The output of described start dumb sound and protective circuit connects signal output part;
The output of described overheating detection circuit connects start dumb sound and protective circuit;
The input of described over-current detection circuit connects the output of low-pass filter circuit, and output connects the input of current comparison circuit;
The output of described current comparison circuit connects gain control circuit.
And as optimal way, described digital power amplifier is provided with man-machine control interface, makes operating function succinctly convenient; And being provided with USB interface and SD card plug, described USB interface and SD card plug connect signal input part, are used to connect the audio interface of multiple medium.
The utility model is the audio power amplifier of producing based on pulse-width modulation (PWM) technology, traditional in the past relatively analog amplifier machine interface is simpler, has lacked A/D conversion and D/A conversion intermediate link, and distortion is littler, cost performance height, treatment effect more can allow the people that sensation on the spot in person is arranged.
In the PWM conversion, with 300KHz or higher sample frequency analog signal is converted into digital signal, again the PWM digital signal after the conversion is carried out highly efficient power and amplify, owing to have only the digital signal of 0 and 1 two state, the power loss during amplification on the high power amplifier spare is minimum.Because simulated audio signal all is included in the change width of PWM, therefore come out as long as adopt the low-pass filter circuit of cut-off frequency 30KHz～40KHz just can from PWM, filter (demodulation) to simulated audio signal.
The utility model is when work, simulated audio signal produces pwm signal through gain control circuit and by pulse-width modulation circuit, triangular-wave generator in the pulse-width modulation circuit produces the standard of comparison of the triangular signal of fixed frequency and amplitude as pulse-width modulation, audio signal by comparator and input compares the back output pwm signal, and the pulsewidth of pwm signal is to change along with the variation of audio frequency signal amplitude in direct ratioly; Power amplification circuit of the present utility model is a H bridge pulsewidth power amplification circuit; the pwm signal that via pulse width modulation obtains amplifies through shaping; drive 4 high-power cmos switch pipes that link to each other with the high-power power supply in the H bridge and take turns conducting; the electric current that the control power supply provides to load; thereby obtain powerful pwm signal; powerful pwm signal passes through low-pass filter circuit again; utilize the effect that discharges and recharges of inductance capacitance to obtain powerful simulated audio signal in load, audio signal is by start dumb sound and protective circuit output.
In addition, surpass normal working temperature if overheating detection circuit detects machine, then control start dumb sound and protective circuit are cut off load.
And over-current detection circuit is used to detect operating current, compares by current comparison circuit, after surpassing the running current of power amplifier, will control the ride gain control circuit and press limit.
Certainly, above-mentioned is a kind of embodiment of the present utility model, is not restricted to protection range of the present utility model, so long as the identical product of basic structure all belongs to protection range of the present utility model.
The utility model digital power amplifier is a kind of audio power amplifier of producing based on pulse modulation technique, its volume is little, in light weight, multiple functional, energy-efficient, environment-friendly type, cost performance high and convenient the use, help penetration and promotion, the utility model can be used in digital movie institute, digital audio public place of entertainment occasion such as family digital sound equipment in one's power, can carry out digitized processing and transmission to the source of sound of various different-formats, realize audio signal free of losses transmission, reproduce the sense true to nature of sound field, satisfied numerous users' demand.
Claims (3)
1. digital power amplifier, comprise signal input part, power amplification circuit, signal output part and power supply, it is characterized in that: described digital power amplifier is provided with gain control circuit, pulse-width modulation circuit, gate driver circuit, low-pass filter circuit, start dumb sound and protective circuit, overheating detection circuit, over-current detection circuit and current comparison circuit;
The input of described gain control circuit connects signal input part, and output connects the input of pulse-width modulation circuit;
The output of described pulse-width modulation circuit connects the input of gate driver circuit;
The output of described gate driver circuit connects the input of power amplification circuit;
The input of described low-pass filter circuit connects the output of power amplification circuit, and output connects the input of start dumb sound and protective circuit;
The output of described start dumb sound and protective circuit connects signal output part;
The output of described overheating detection circuit connects start dumb sound and protective circuit;
The input of described over-current detection circuit connects the output of low-pass filter circuit, and output connects the input of current comparison circuit;
The output of described current comparison circuit connects gain control circuit.
2. a kind of power amplifier according to claim 1 is characterized in that: described digital power amplifier is provided with man-machine control interface.
3. a kind of power amplifier according to claim 1 and 2 is characterized in that: described digital power amplifier is provided with USB interface and SD card plug, and described USB interface and SD card plug connect signal input part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200565815U CN201490975U (en) | 2009-05-14 | 2009-05-14 | Digital power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200565815U CN201490975U (en) | 2009-05-14 | 2009-05-14 | Digital power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201490975U true CN201490975U (en) | 2010-05-26 |
Family
ID=42429841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200565815U Expired - Fee Related CN201490975U (en) | 2009-05-14 | 2009-05-14 | Digital power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201490975U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102343634A (en) * | 2010-08-02 | 2012-02-08 | 北京中电科电子装备有限公司 | Overheat protecting device and method of motorized spindle and cutter |
| CN102420572A (en) * | 2011-11-23 | 2012-04-18 | 惠州市德赛视听科技有限公司 | Equipment with audio power amplifier |
| CN102751959A (en) * | 2012-06-11 | 2012-10-24 | 东莞市龙健电子有限公司 | Audio-digital power amplifying system |
| CN103248984A (en) * | 2013-04-17 | 2013-08-14 | 佛山市毅丰电器实业有限公司 | Audio power amplifier module supporting hot plug and method of audio power amplifier module |
| CN104270106A (en) * | 2014-09-16 | 2015-01-07 | 广州杰士莱电子有限公司 | Power amplifier circuit |
| CN110324009A (en) * | 2019-06-20 | 2019-10-11 | 电子科技大学 | A kind of distributed generation resource modulated amplifier with filter function |
| CN111213389A (en) * | 2017-10-20 | 2020-05-29 | 辛纳普蒂克斯公司 | Current measurement at the output of a switching amplifier |
| CN112969131A (en) * | 2021-04-25 | 2021-06-15 | 孟闯 | High-fidelity sound box and implementation method thereof |
-
2009
- 2009-05-14 CN CN2009200565815U patent/CN201490975U/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102343634A (en) * | 2010-08-02 | 2012-02-08 | 北京中电科电子装备有限公司 | Overheat protecting device and method of motorized spindle and cutter |
| CN102420572A (en) * | 2011-11-23 | 2012-04-18 | 惠州市德赛视听科技有限公司 | Equipment with audio power amplifier |
| CN102751959A (en) * | 2012-06-11 | 2012-10-24 | 东莞市龙健电子有限公司 | Audio-digital power amplifying system |
| TWI589114B (en) * | 2013-04-17 | 2017-06-21 | A hot-swappable audio power amplifier module and method thereof | |
| CN103248984B (en) * | 2013-04-17 | 2017-02-08 | 佛山市毅丰电器实业有限公司 | Method for achieving hot plugging through audio power amplifier module supporting hot plugging |
| CN103248984A (en) * | 2013-04-17 | 2013-08-14 | 佛山市毅丰电器实业有限公司 | Audio power amplifier module supporting hot plug and method of audio power amplifier module |
| CN104270106A (en) * | 2014-09-16 | 2015-01-07 | 广州杰士莱电子有限公司 | Power amplifier circuit |
| CN104270106B (en) * | 2014-09-16 | 2017-09-26 | 广州杰士莱电子有限公司 | Power amplifier |
| CN111213389A (en) * | 2017-10-20 | 2020-05-29 | 辛纳普蒂克斯公司 | Current measurement at the output of a switching amplifier |
| US11041890B2 (en) | 2017-10-20 | 2021-06-22 | Synaptics Incorporated | Current measurement at a switching amplifier output |
| CN111213389B (en) * | 2017-10-20 | 2022-06-21 | 辛纳普蒂克斯公司 | Current measurement at the output of a switching amplifier |
| CN110324009A (en) * | 2019-06-20 | 2019-10-11 | 电子科技大学 | A kind of distributed generation resource modulated amplifier with filter function |
| CN112969131A (en) * | 2021-04-25 | 2021-06-15 | 孟闯 | High-fidelity sound box and implementation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201490975U (en) | Digital power amplifier | |
| CN203368304U (en) | Novel buck drive circuit | |
| CN101656068B (en) | Buzzer drive circuit, buzzer and electrical appliance with buzzer | |
| CN203086416U (en) | Power amplifier based on triangle generator | |
| CN203608358U (en) | Plasma loudspeaker | |
| CN201491219U (en) | Microphone with energy-saving function | |
| CN203206118U (en) | Efficient DC/DC boost converting circuit | |
| CN203166834U (en) | Digital power amplification circuit with switching power supply | |
| CN203015724U (en) | Intelligent sound bird dispeller circuit based on MP3 module | |
| CN102780401A (en) | Intelligent control circuit and intelligent control method of switch power supply efficiency | |
| CN203523020U (en) | Audio power amplifier circuit and wireless loudspeaker box | |
| CN203562970U (en) | Class-D power-amplifier switching power supply capable of supplying 1000w power | |
| CN202840964U (en) | Intelligent switch power energy efficiency control circuit | |
| CN203104369U (en) | Carrier-wave underclocking type class-D audio power amplifier | |
| CN201265786Y (en) | Respiration lamp apparatus | |
| CN201797488U (en) | Novel digital input power amplifier | |
| CN200976571Y (en) | Message amplifier driving by single power supply | |
| CN109818674B (en) | Signal receiving module circuit of visible light communication wireless broadcasting system | |
| CN203984751U (en) | A kind of acoustic control lamp circuit | |
| CN218940950U (en) | Intelligent integrated voltage power amplifier and power supply equipment for integrated terminal detection equipment | |
| CN204244180U (en) | A kind of suppression high-frequency noise circuit | |
| CN202435345U (en) | Energy-saving high-efficiency audio power amplifier | |
| CN203537328U (en) | Frequency-adjustable triangular wave power amplifier | |
| CN207691686U (en) | A kind of DC-DC inverter circuits | |
| CN202795123U (en) | Class-D-power-amplifier constant current source device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100526 Termination date: 20140514 |