CN202276319U - Digital audio power amplification power supply circuit - Google Patents
Digital audio power amplification power supply circuit Download PDFInfo
- Publication number
- CN202276319U CN202276319U CN2011204309571U CN201120430957U CN202276319U CN 202276319 U CN202276319 U CN 202276319U CN 2011204309571 U CN2011204309571 U CN 2011204309571U CN 201120430957 U CN201120430957 U CN 201120430957U CN 202276319 U CN202276319 U CN 202276319U
- Authority
- CN
- China
- Prior art keywords
- power supply
- digital audio
- power amplifier
- power
- management circuit
- 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 - Lifetime
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model discloses a digital audio power amplification power supply circuit which comprises a power supply, a digital audio power amplifier and a power supply management circuit, wherein the power supply management circuit is used for managing the power supply of the digital audio power amplifier; the power supply management circuit is connected between the power supply and the digital audio power amplifier; and the power supply management circuit comprises a diode, a first resistor, a second resistor and a PNP triode. The digital audio power amplification power supply circuit has the advantages that the distortion problem of low-frequency audio signals output by the digital audio power amplifier is eliminated, the sound effect and quality are improved, in addition, the circuit is simple, the cost is low, the property is stable and reliable, the suitability is strong, and the important application value is realized.
Description
Technical field
The utility model relates to the digital audio-power amplifier field, relates in particular to a kind of digital audio-power amplifier power supply circuits.
Background technology
Because digital audio-power amplifier has the efficient height and heat radiation requires advantages such as low, it has been obtained widely and has used.The way of output of digital audio-power amplifier comprises half-bridge output and full-bridge output dual mode, and wherein the mode of half-bridge output has that cost is low, simplicity of design, takies the little advantage of PCB area, and therefore most digital audio-power amplifier all adopts the mode that half-bridge is exported.And because the audio signal of digital audio-power amplifier output is a digital audio and video signals; This digital audio and video signals must obtain removing to drive loudspeaker again behind the simulated audio signal through filtering; Yet, all be at present to adopt the filter circuit of forming by inductance L and capacitor C that digital audio and video signals is carried out filtering basically, because the existence of LC filter circuit; When digital audio-power amplifier adopts half-bridge output; Its power supply will receive the influence from digital audio-power amplifier end reverse irrigated current, and this reverse irrigated current will cause the catastrophic fluctuation of power supply supply power voltage, even causes that the modulation of power supply transformer is unusual; The phenomenon that also will cause the busbar voltage appearance lifting of digital audio-power amplifier; Thereby cause the audio signal of digital audio-power amplifier output distortion to occur, this situation is particularly serious when digital audio-power amplifier output low frequency audio signal, and it will have a strong impact on the effect and the quality of sound.
For the fluctuation of the digital audio-power amplifier that prevents to adopt half-bridge output its supply power voltage when the output low frequency audio signal, eliminate the distortion phenomenon of its audio signal, generally in the prior art adopt following method:
(1) adopts high-quality power supply, improve the carrying load ability of power supply;
(2) cut-off frequency of raising audio signal prevents that low-frequency audio signal from occurring.
It is high that yet the defective of said method (1) is a cost, and it can only to a certain degree improve the distortion of audio signal, and it can not really eliminate the distortion of audio signal; And the defective of method (2) is the low frequency disappearance that will cause sound, thereby influences the effect and the quality of sound.
The utility model content
The main purpose of the utility model provides a kind of digital audio-power amplifier power supply circuits that can eliminate the low-frequency audio signal distortion with raising sound effect and quality.
In order to achieve the above object, the utility model proposes a kind of digital audio-power amplifier power supply circuits, comprises power supply and digital audio-power amplifier, also comprises a power supply management circuit, and said power supply management circuit is connected between said power supply and the digital audio-power amplifier.
Preferably; Said power supply management circuit comprises that its electric current when being used to prevent said digital audio-power amplifier output low frequency audio signal pours in down a chimney the diode into said power supply; The anode of said diode is connected in the output of said power supply, and the negative electrode of said diode is connected in the power input of digital audio-power amplifier.
Preferably, said power supply management circuit comprises that also one is used for stablizing the discharge circuit of digital audio-power amplifier operating voltage.
Preferably; Said discharge circuit comprises first resistance, second resistance and PNP triode; Said first resistance is connected between the base stage of output and said PNP triode of said power supply; Said second resistance is connected between the collector electrode and ground of said PNP triode, and the emitter of said PNP triode is connected in the power input of said digital audio-power amplifier.
The digital audio-power amplifier power supply circuits that the utility model proposes have been eliminated the problem of dtmf distortion DTMF of digital audio-power amplifier institute output low frequency audio signal, have improved the effect and the quality of sound.And the circuit of the utility model is simple, cost is low, and it is stable and reliable for performance, and applicability is strong, and it has important use and is worth.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model digital audio-power amplifier power supply circuits preferred embodiment.
The realization of the utility model purpose, functional characteristics and advantage will combine embodiment, further specify with reference to accompanying drawing.
Embodiment
The main solution of the utility model is: through being connected a power supply management circuit between digital audio-power amplifier and its power supply; Be used for the power supply of digital audio-power amplifier is managed; With the problem of dtmf distortion DTMF of elimination digital audio-power amplifier institute output low frequency audio signal, thereby realization improves the purpose of sound effect and quality.
With reference to Fig. 1; Fig. 1 is the electrical block diagram of the utility model digital audio-power amplifier power supply circuits preferred embodiment; Present embodiment is the power supply circuits of digital audio-power amplifier in the television set; These power supply circuits comprise power supply 101, power supply management circuit 103, digital audio-power amplifier 102, and wherein power supply management circuit 103 is connected between digital audio-power amplifier 102 and its power supply 101, and this power supply management circuit 103 comprises diode D1, first resistance R 1, second resistance R 2 and PNP triode Q1.
Wherein, the anode of diode D1 is connected in the output of power supply 101, and the negative electrode of diode D1 is connected in the power input of digital audio-power amplifier 102;
One end of first resistance R 1 is connected in the output of power supply 101, and the other end of first resistance R 1 is connected in the base stage of PNP triode Q1;
One end of second resistance R 2 is connected in the collector electrode of PNP triode Q1, and the other end of second resistance R 2 is connected with ground;
The emitter of PNP triode Q1 is connected in the power input of digital audio-power amplifier 102.
Concrete, when diode D1 was used for preventing television set digital audio-power amplifier 102 output low frequency audio signals, the electric current of digital audio-power amplifier 102 poured in down a chimney in its power supply 101, to guarantee the stable of its power supply 101 supply power voltages;
And first resistance R 1, second resistance R 2 and PNP triode Q1 form a discharge circuit; This discharge circuit is used for the operating voltage of stable television machine digital audio-power amplifier 102; Also be used for when the closing television machine; When promptly turn-offing the power supply 101 of digital audio-power amplifier 102, the residual voltage of bleed off digital audio-power amplifier 102 is with the initial condition of fast quick-recovery digital audio-power amplifier 102.
Before the television boot-strap, the magnitude of voltage of the output voltage 24V_S of power supply 101 is 0V, and the magnitude of voltage of the input voltage 24V_DAMP of digital audio-power amplifier 102 is 0V.
During television boot-strap; The magnitude of voltage of the output voltage 24V_S of power supply 101 is 24V; The magnitude of voltage of the input voltage 24V_DAMP of digital audio-power amplifier 102 is 0V; Diode D1 conducting, the output voltage 24V_S of power supply 101 makes the magnitude of voltage of the input voltage 24V_DAMP of digital audio-power amplifier 102 be upgraded to 24V fast through diode D1.In the television boot-strap process, the voltage of the base stage b of PNP triode Q1 is higher than the voltage of its emitter e all the time, and therefore, in the process of television boot-strap, PNP triode Q1 does not have conducting all the time.
In the television set during digital audio-power amplifier 102 output low frequency audio signals; When digital audio-power amplifier 102 needs energy; Because the conducting of diode D1; Power supply 101 is digital audio-power amplifier 102 power supplies through diode D1, and it is constant that the magnitude of voltage of the magnitude of voltage of the input voltage 24V_DAMP of digital audio-power amplifier 102 and the output voltage 24V_S of its power supply 101 is all kept 24V basically;
When digital audio-power amplifier 102 when power supply 101 returns energy; Be that digital audio-power amplifier 102 ends are when its power supply 101 end reverse irrigated currents; The magnitude of voltage of digital audio-power amplifier 102 ends is higher than the magnitude of voltage of its power supply 101 ends, and diode D1 ends, and it is constant that the output voltage 24V_S of power supply 101 ends keeps 24V basically; Promptly because the ending of diode D1; When having prevented digital audio-power amplifier 102 output low frequency audio signals, the electric current of digital audio-power amplifier 102 ends pours in down a chimney into its power supply 101 ends, thereby has guaranteed the stable of power supply 101 supply power voltages.And the magnitude of voltage of PNP triode Q1 emitter e is higher than the magnitude of voltage of its base stage b at this moment; PNP triode Q1 is in the saturation conduction state; The voltage of digital audio-power amplifier 102 ends is through PNP triode Q1 and 2 repid discharges of second resistance R, becomes 24V until the magnitude of voltage of digital audio-power amplifier 102 ends, till PNP triode Q1 ends; Thereby guaranteed the stable of digital audio-power amplifier 102 operating voltages, it is constant to keep 24V basically.
During the television set shutdown; The magnitude of voltage of the output voltage 24V_S of power supply 101 becomes 0V immediately; The magnitude of voltage of digital audio-power amplifier 102 ends is 24V, PNP triode Q1 this moment saturation conduction immediately, thus bleed off falls the residual voltage of digital audio-power amplifier 102 ends; Make digital audio-power amplifier 102 fast its initial conditions of quick-recovery, thereby guaranteed the stable and safety of digital audio-power amplifier 102 in the television set.
The beneficial effect of the utility model is: when the utility model has prevented digital audio-power amplifier output low frequency audio signal; The electric current of digital audio-power amplifier pours in down a chimney in its power supply; Thereby guaranteed the stable of its power supply supply power voltage, simultaneously, the utility model has also guaranteed the stable of digital audio-power amplifier operating voltage; Thereby eliminated the problem of dtmf distortion DTMF of digital audio-power amplifier institute output low frequency audio signal, improved the effect and the quality of sound.And the utility model can also be used for when turn-offing power supply, making its initial condition of the fast quick-recovery of digital audio-power amplifier, has guaranteed the stable and safety of digital audio-power amplifier.And the circuit of the utility model is simple, cost is low, and it is stable and reliable for performance, and applicability is strong, so it has important use value.
The above is merely the preferred embodiment of the utility model; Be not thus the restriction the utility model claim; Every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the utility model.
Claims (4)
1. digital audio-power amplifier power supply circuits comprise power supply and digital audio-power amplifier, it is characterized in that, also comprise a power supply management circuit, and said power supply management circuit is connected between said power supply and the digital audio-power amplifier.
2. digital audio-power amplifier power supply circuits according to claim 1; It is characterized in that; Said power supply management circuit comprises that its electric current when being used to prevent said digital audio-power amplifier output low frequency audio signal pours in down a chimney the diode into said power supply; The anode of said diode is connected in the output of said power supply, and the negative electrode of said diode is connected in the power input of digital audio-power amplifier.
3. digital audio-power amplifier power supply circuits according to claim 1 and 2 is characterized in that, said power supply management circuit comprises that also one is used for stablizing the discharge circuit of digital audio-power amplifier operating voltage.
4. digital audio-power amplifier power supply circuits according to claim 3; It is characterized in that; Said discharge circuit comprises first resistance, second resistance and PNP triode; Said first resistance is connected between the base stage of output and said PNP triode of said power supply, and said second resistance is connected between the collector electrode and ground of said PNP triode, and the emitter of said PNP triode is connected in the power input of said digital audio-power amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204309571U CN202276319U (en) | 2011-11-03 | 2011-11-03 | Digital audio power amplification power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204309571U CN202276319U (en) | 2011-11-03 | 2011-11-03 | Digital audio power amplification power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202276319U true CN202276319U (en) | 2012-06-13 |
Family
ID=46196655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204309571U Expired - Lifetime CN202276319U (en) | 2011-11-03 | 2011-11-03 | Digital audio power amplification power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202276319U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106060687A (en) * | 2016-06-08 | 2016-10-26 | 钰太芯微电子科技（上海）有限公司 | Multi-mode microphone power supply system |
-
2011
- 2011-11-03 CN CN2011204309571U patent/CN202276319U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106060687A (en) * | 2016-06-08 | 2016-10-26 | 钰太芯微电子科技（上海）有限公司 | Multi-mode microphone power supply system |
| CN106060687B (en) * | 2016-06-08 | 2024-05-17 | 钰太芯微电子科技（上海）有限公司 | Multi-mode microphone power supply system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN200976577Y (en) | MOS tube driving circuit and television set having the same | |
| CN107171647A (en) | Adaptive bias circuit and wireless transmitting system with low-loss and temperature-compensating | |
| CN202276319U (en) | Digital audio power amplification power supply circuit | |
| CN101908819A (en) | Surge suppression circuit | |
| CN101674064B (en) | Resonance circuit with a voltage clamping device and dynamic control method thereof | |
| CN202261772U (en) | Mute failure protection circuit | |
| CN201294489Y (en) | Load circuit, power supply circuit and electronic equipment | |
| CN202713233U (en) | Automobile player digital audio power amplifier power supply circuit and automobile player | |
| CN103490387B (en) | A kind of single-stage PFC fly-back power source input under-voltage protection circuit | |
| CN206332606U (en) | FET drive circuit | |
| CN104467435A (en) | Balance modulation type multiplex output stabilized voltage supply based on logic protection amplifying circuit | |
| CN204992542U (en) | Dead type overvoltage crowbar of lock | |
| CN106685192A (en) | Power supply circuit of switch system | |
| CN207869069U (en) | A kind of CLASSD audio frequency power amplifiers pre-driver circuit and audio frequency power amplifier | |
| CN103034607B (en) | Plug-and-play circuit, interface circuit and electronic equipment assembly | |
| CN202495882U (en) | Power supply circuit and television | |
| CN106375690A (en) | Pop sound elimination circuit | |
| CN203352433U (en) | Full-bridge LLC conversion circuit | |
| CN202713490U (en) | Short-circuit protective circuit at power supply end of liquid crystal display television control chip and liquid crystal display television | |
| CN202068549U (en) | Integral power-on and power-off mute control circuit | |
| CN206364698U (en) | It is a kind of to improve repeatedly the compensating electric capacity clamp circuit of quick power-on and power-off loop response | |
| CN104469611A (en) | Audio processing system for widening range | |
| CN205050070U (en) | Computer power supply circuit | |
| CN104410372A (en) | Logic protection amplifying circuit based switching power amplification system | |
| CN204206430U (en) | A kind of audio amplifier switching on and shutting down anti-impact circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120613 |