CN202135100U - Three-level D-class audio power amplifier - Google Patents
Three-level D-class audio power amplifier Download PDFInfo
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- CN202135100U CN202135100U CN201120212175U CN201120212175U CN202135100U CN 202135100 U CN202135100 U CN 202135100U CN 201120212175 U CN201120212175 U CN 201120212175U CN 201120212175 U CN201120212175 U CN 201120212175U CN 202135100 U CN202135100 U CN 202135100U
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Abstract
The utility model provides a three-level D-class audio power amplifier, which comprises an audio signal input end, a grounding end and a loudspeaker load and further comprises a preamplifier, a modulator, a driving stage circuit, a power stage circuit and a three-level modulator circuit. The preamplifier is used for amplifying and outputting received simulated audio signals, the modulator is used for modulating the amplified simulated audio signals into digital signals and outputting the digital signals, the driving stage circuit is used for sequentially controlling the digital signals and outputting driving signals, the power stage circuit is used for amplifying the driving signals and driving the loudspeaker load, and the three-level modulating circuit is connected with the output end of the power stage circuit and the loudspeaker load to produce digital signals output by three kinds of level. The three-level D-class audio power amplifier can output three states of level, namely low level, high level and ground level, and accordingly is favorable for improving system efficiency when the system is light loaded.
Description
Technical field
The utility model relates to a kind of power amplifier, particularly relates to a kind of three level D genus audio power amplifiers.
Background technology
The D genus audio power amplifier is a kind ofly will import the pulse signal that simulated audio signal or PCM digital information are transformed into PWM (pulse width modulation) or PDM (pulse density modulated); Pulse signal with PWM or PDM removes to control high-power switch device on/off audio-frequency power amplifier then, so be also referred to as switching amplifier.Have the clear superiority of high efficiency, low-power consumption with respect to category-A or category-B audio-frequency power amplifier D genus audio power amplifier, be applied in mobile phone widely, MP3, the long-time battery that relies on such as panel computer provides in the portable set of electric power energy.
In the prior art, said D genus audio power amplifier adopts the structure of H type bridge-type output usually.See also Fig. 1 and Fig. 2; Fig. 1 is shown as the circuit theory sketch map of D class power amplifier of the structure of available technology adopting H type bridge-type output; Fig. 2 is shown as the power stage circuit sketch map of D class power amplifier among Fig. 1; As shown in the figure; Said D genus audio power amplifier 1 by the battery 10 that is used to provide LVPS, be used to amplify audio signal prime amplifier 11, audio signal be modulated to the modulator 12 of digital signal, the driving stage circuit 13 that is used for control timing and driving, the power stage circuit 14 that is used for output drive signal and loudspeaker 15 form, can know that by Fig. 2 the signal that the output of said power stage circuit 14 is exported non-" 0 " i.e. " 1 "; That is to say; The D class A amplifier A is generally battery-powered in portable set, and no matter based on which kind of debud mode output signal putting down with height is that supply voltage is represented " 1 ", representes " 0 " with low level.
Yet; Along with electronic equipment in recent years to the requirement of volume; Said D genus audio power amplifier need reach higher power output; And the most directly method is to realize this purpose through improving supply voltage, is just to set up a booster circuit to come from producing higher supply voltage for satisfying the common way of above-mentioned purpose.But, because the D genus audio power amplifier is that power output is that the output signal also carries out the upset of " 0 " and " 1 " under zero the state under certain switching frequency there not being signal input.Thus, switching loss and conduction loss can raise along with the rising of supply voltage, thereby make the deterioration quiescent current, and the system effectiveness when having reduced underload.
The utility model content
The shortcoming of prior art in view of the above, the purpose of the utility model is to provide a kind of three level D genus audio power amplifiers, the system effectiveness when improving underload.
For realizing above-mentioned purpose and other relevant purposes; The utility model provides a kind of three level D genus audio power amplifiers; Include audio signal input end, earth terminal and a loudspeaker, it is characterized in that, also comprise: prime amplifier; Be connected in said audio signal input end, be used for the simulated audio signal that receives is amplified back output; Modulator is connected in the output of said prime amplifier, is used for the simulated audio signal after amplifying is modulated to digital signal and output; The driving stage circuit is connected in the output of said modulator, is used for carrying out SECO to receiving said digital signal, and output drive signal; Power stage circuit is connected in the output of said driving stage circuit, is used for amplifying to drive said loudspeaker receiving said drive signal; Three level modulation circuit; Be connected in the output and the loudspeaker of said power stage circuit; In order to produce the digital signal of low level, high level and three kinds of level outputs of ground level; Comprise a low potential power source, a high potential power is connected in the output of said power stage circuit and the low level switch element between the said low potential power source; Be connected in the output of said power stage circuit and the high level switch element between the said high potential power, and be connected in the output of said power stage circuit and the ground level switch element between the said earth terminal.
In the three level D genus audio power amplifiers of the utility model, said power stage circuit has positive output end and negative output terminal.
In an embodiment, said low level switch element is two, and between the positive output end and said low potential power source that one is connected in said power stage circuit, another is connected between the negative output terminal and said low potential power source of said power stage circuit.Preferably, said low level switch element is a transistor switch.
In an embodiment, said high level switch element is two, and between the positive output end and said high potential power that one is connected in said power stage circuit, another is connected between the negative output terminal and said high potential power of said power stage circuit.Preferably, said high level switch element is a transistor switch.
In an embodiment, said ground level switch element is two, and between the positive output end and said earth terminal that one is connected in said power stage circuit, another is connected between the negative output terminal and said earth terminal of said power stage circuit.Preferably, said ground level switch element is a transistor switch.
As stated; The three level D genus audio power amplifiers of the utility model can output low level, the level of high level and three kinds of states of ground level; Can only export the D genus audio power amplifier of structure of employing H type bridge-type output of the level of two states in the prior art, the system effectiveness when the three level D genus audio power amplifiers of the utility model more help improving underload.
Description of drawings
Fig. 1 is shown as the circuit theory sketch map of D class power amplifier of the structure of available technology adopting H type bridge-type output.
Fig. 2 is shown as the power stage circuit sketch map of D class power amplifier among Fig. 1.
Fig. 3 is shown as the circuit theory sketch map of the three level D genus audio power amplifiers of the utility model.
Fig. 4 is shown as three level modulation circuit theory sketch mapes in the three level D genus audio power amplifiers of the utility model.
Embodiment
Below through the execution mode of specific instantiation explanation the utility model, those skilled in the art can be understood other advantages and the effect of the utility model easily by the content that this specification disclosed.The utility model can also be implemented or use through other different embodiment, and each item details in this specification also can be carried out various modifications or change based on different viewpoints and application under the spirit that does not deviate from the utility model.
See also Fig. 3 and Fig. 4, Fig. 3 is shown as the circuit theory sketch map of the three level D genus audio power amplifiers of the utility model.Fig. 4 is shown as three level modulation circuit theory sketch mapes in the three level D genus audio power amplifiers of the utility model.Need to prove; The diagram that is provided in the present embodiment is only explained the basic conception of the utility model in a schematic way; Satisfy only show in graphic with the utility model in relevant assembly but not component count, shape and plotted when implementing according to reality; Kenel, quantity and the ratio of each assembly can be a kind of random change during its actual enforcement, and its assembly layout kenel also maybe be more complicated.
As shown in the figure, the utility model provides a kind of three level D genus audio power amplifiers 2, includes audio signal input end 21, earth terminal 22; Loudspeaker 23, prime amplifier 24, modulator 25; Driving stage circuit 26, power stage circuit 27, and three level modulation circuit (being as shown in Figure 4).
Said prime amplifier 24 is connected in said audio signal input end 21; Particularly; Said audio signal input end 21 is divided into audio signal positive input terminal and audio signal negative input end, and said prime amplifier 24 is used for exporting to modulator 25 after the simulated audio signal amplification that receives.
Said modulator 25 is connected in the output of said prime amplifier 24, is used for the simulated audio signal after amplifying is modulated to digital signal and exports to driving stage circuit 26.
Said driving stage circuit 26 is connected in the output of said modulator 25, be used for carrying out SECO to receiving said digital signal, and output drive signal is given power stage circuit 27.
Said power stage circuit 27 is connected in the output of said driving stage circuit 26, is used for amplifying to drive said loudspeaker 23 receiving said drive signal; Particularly, said power stage circuit 27 has positive output end 271 and negative output terminal 272.
As shown in Figure 4; Said three level modulation circuit are connected in the positive and negative output 271,272 and the loudspeaker 23 of said power stage circuit 27, and in order to produce the digital signal of low level, high level and three kinds of level outputs of ground level, it includes a low potential power source 28; One high potential power 29; Low level switch element 281,282, high level switch element 291,292, and ground level switch element 221,222.
In this execution mode; 2 of the D genus audio power amplifiers that said low potential power source 28 can be the utility model are applied to existing battery in the electronic apparatus system, and said high potential power 29 can be to be produced or 2 of the D genus audio power amplifiers of the utility model are applied to existing high potential power in the electronic apparatus system by booster circuit.
Said low level switch element 281,282 is connected between the output 271,272 and said low potential power source 28 of said power stage circuit 27; In order to conducting or cut off the low potential power source signal of said low potential power source 28 to 271,272 outputs of the output of said power stage circuit 27, and then the output of the low level digital signal that produces of may command.In this execution mode; Said low level switch element is two; One of them low level switch element 281 is connected between the positive output end 271 and said low potential power source 28 of said power stage circuit 27, and another low level switch element 282 is connected between the negative output terminal 272 and said low potential power source 28 of said power stage circuit 27.In the application of reality, said low level switch element 281,282 for example is a transistor switch.
Said high level switch element 291,292 is connected between the output 271,272 and said high potential power 29 of said power stage circuit 27; In order to conducting or cut off the high potential power signal of said high potential power 29 to 271,272 outputs of the output of said power stage circuit 27, and then the output of the high level digital signal that produces of may command.In this execution mode; Said high level switch element is two; One of them high level switch element 291 is connected between the positive output end 271 and said high potential power 29 of said power stage circuit 27, and another high level switch element 292 is connected between the negative output terminal 272 and said high potential power 29 of said power stage circuit 27.In the application of reality, said high level switch element 291,292 for example is a transistor switch.
Said ground level switch element 221,222 is connected between the output 271,272 and said earth terminal 22 of said power stage circuit 27; In order to the output of controlling said power stage circuit 27 271,272 ground connection whether, and then the output of the ground level digital signal that produces of may command.In this execution mode; Said ground level switch element is two; One of them ground level switch element 221 is connected between the positive output end 271 and said earth terminal 22 of said power stage circuit 27, and another ground level switch element 222 is connected between the negative output terminal 272 and said earth terminal 22 of said power stage circuit 27.In the application of reality, said ground level switch element 221,222 for example is a transistor switch.
Be principle and the effect that further highlights the utility model; See also Fig. 4 again; Be that example describes temporarily to have the monolateral circuit that low level switch element 281, high level switch element 291 and ground level switch element 221 that positive output end 271 is connected constitute with said power stage circuit 27, as shown in the figure, when said ground level switch element 221 closures; When said low level switch element 281 breaks off with high level switch element 291; The output 271 of said power stage circuit 27 is connected through ground level switch element 221 and earth terminal 22, and the level of output is a ground level, and this is first kind of level state output; When said low level switch element 281 closures; When said high level switch element 291 breaks off with ground level switch element 221; The output 271 of said power stage circuit 27 is connected through low level switch element 281 and said low potential power source 28; Then the level of output is low level (or being called intermediate level), and this is second kind of level state output; When said high level switch element 291 closures; When said low level switch element 281 breaks off with ground level switch element 221; The output 271 of said power stage circuit 27 is connected through high level switch element 291 and high potential power 29; Then the level of output is a high level, and this is the third level state output.In concrete application process; When amplitude output signal is less; Output 271 outputs of said power stage circuit 27 are mainly switched between first kind of level state and second kind of level state, when amplitude output signal becomes big, the third level state can occur.What need special instruction is; Because the monolateral circuit that monolateral circuit that low level switch element 282, high level switch element 292 and ground level switch element 222 constitute and low level switch element 281, high level switch element 291 and ground level switch element 221 constitute is symmetry fully; So working mechanism is identical; Thereby do not repeat them here, state clearly hereby.
In sum; The three level D genus audio power amplifiers of the utility model can output low level, the level of high level and three kinds of states of ground level; Can only export the D genus audio power amplifier of structure of employing H type bridge-type output of the level of two states in the prior art, the system effectiveness when the three level D genus audio power amplifiers of the utility model more help improving underload.So the utility model has effectively overcome various shortcoming of the prior art and the tool high industrial utilization.
Above-mentioned execution mode is the principle and the effect thereof of illustrative the utility model only, but not is used to limit the utility model.Any be familiar with this technological personage all can be under the spirit and category of the utility model, above-mentioned execution mode is modified or is changed.Therefore, have common knowledge the knowledgeable under such as in the technical field, must contain by the claim of the utility model not breaking away from all equivalence modification or changes that spirit that the utility model discloses and technological thought are accomplished down.
Claims (8)
1. a level D genus audio power amplifier includes audio signal input end, earth terminal and a loudspeaker, it is characterized in that, also comprises:
Prime amplifier is connected in said audio signal input end, is used for the simulated audio signal that receives is amplified back output;
Modulator is connected in the output of said prime amplifier, is used for the simulated audio signal after amplifying is modulated to digital signal and output;
The driving stage circuit is connected in the output of said modulator, is used for carrying out SECO to receiving said digital signal, and output drive signal;
Power stage circuit is connected in the output of said driving stage circuit, is used for amplifying to drive said loudspeaker receiving said drive signal;
Three level modulation circuit; Be connected in the output and the loudspeaker of said power stage circuit; In order to produce the digital signal of low level, high level and three kinds of level outputs of ground level; Comprise a low potential power source, a high potential power is connected in the output of said power stage circuit and the low level switch element between the said low potential power source; Be connected in the output of said power stage circuit and the high level switch element between the said high potential power, and be connected in the output of said power stage circuit and the ground level switch element between the said earth terminal.
2. three level D genus audio power amplifiers according to claim 1, it is characterized in that: said power stage circuit has positive output end and negative output terminal.
3. three level D genus audio power amplifiers according to claim 2; It is characterized in that: said low level switch element is two; Between the positive output end and said low potential power source that one is connected in said power stage circuit, another is connected between the negative output terminal and said low potential power source of said power stage circuit.
4. three level D genus audio power amplifiers according to claim 3, it is characterized in that: said low level switch element is a transistor switch.
5. three level D genus audio power amplifiers according to claim 2; It is characterized in that: said high level switch element is two; Between the positive output end and said high potential power that one is connected in said power stage circuit, another is connected between the negative output terminal and said high potential power of said power stage circuit.
6. three level D genus audio power amplifiers according to claim 5, it is characterized in that: said high level switch element is a transistor switch.
7. three level D genus audio power amplifiers according to claim 2; It is characterized in that: said ground level switch element is two; Between the positive output end and said earth terminal that one is connected in said power stage circuit, another is connected between the negative output terminal and said earth terminal of said power stage circuit.
8. three level D genus audio power amplifiers according to claim 7, it is characterized in that: said ground level switch element is a transistor switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120212175U CN202135100U (en) | 2011-06-22 | 2011-06-22 | Three-level D-class audio power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120212175U CN202135100U (en) | 2011-06-22 | 2011-06-22 | Three-level D-class audio power amplifier |
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| Publication Number | Publication Date |
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| CN202135100U true CN202135100U (en) | 2012-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120212175U Expired - Fee Related CN202135100U (en) | 2011-06-22 | 2011-06-22 | Three-level D-class audio power amplifier |
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| Country | Link |
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| CN (1) | CN202135100U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102843110A (en) * | 2011-06-22 | 2012-12-26 | 无锡闻德科技有限公司 | Three-level class D audio power amplifier |
| CN103066938A (en) * | 2012-12-19 | 2013-04-24 | 广州飞达音响专业器材有限公司 | High-power switching power supply amplifier |
| CN104518743A (en) * | 2013-09-27 | 2015-04-15 | 亚德诺半导体集团 | Class HD power amplifier |
| CN107112892A (en) * | 2014-10-02 | 2017-08-29 | 梅鲁斯音频有限公司 | Multi output boosting DC D/C power converters |
-
2011
- 2011-06-22 CN CN201120212175U patent/CN202135100U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102843110A (en) * | 2011-06-22 | 2012-12-26 | 无锡闻德科技有限公司 | Three-level class D audio power amplifier |
| CN102843110B (en) * | 2011-06-22 | 2016-02-24 | 无锡闻德科技有限公司 | Three level D-type audio power amplifier |
| CN103066938A (en) * | 2012-12-19 | 2013-04-24 | 广州飞达音响专业器材有限公司 | High-power switching power supply amplifier |
| CN104518743A (en) * | 2013-09-27 | 2015-04-15 | 亚德诺半导体集团 | Class HD power amplifier |
| CN104518743B (en) * | 2013-09-27 | 2018-04-13 | 亚德诺半导体集团 | HD power-like amplifiers |
| CN107112892A (en) * | 2014-10-02 | 2017-08-29 | 梅鲁斯音频有限公司 | Multi output boosting DC D/C power converters |
| CN107112892B (en) * | 2014-10-02 | 2019-09-03 | 英飞凌科技奥地利有限公司 | Multi output boost DC-DC power adapter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120201 Termination date: 20140622 |
|
| EXPY | Termination of patent right or utility model |