CN204168480U - Digital power amplifier circuit - Google Patents
Digital power amplifier circuit Download PDFInfo
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- CN204168480U CN204168480U CN201420531045.7U CN201420531045U CN204168480U CN 204168480 U CN204168480 U CN 204168480U CN 201420531045 U CN201420531045 U CN 201420531045U CN 204168480 U CN204168480 U CN 204168480U
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Abstract
A kind of digital power amplifier circuit, comprise DSP, LCD display, AB class power amplifier, D class power amplifier, loudspeaker, bass horn, main power source and auxiliary power, outside source is input to DSP, carry out after Treatment Analysis through DSP, treble portion is by AB class power amplifier Direct driver loudspeaker, bass part is by D class power amplifier Direct driver bass horn, and described main power source powers to respectively AB class power amplifier and D class power amplifier, and auxiliary power is powered to DSP; Described DSP is connected with LCD display.The utility model all has multinomial protective circuit to AB class power amplifier and D class power amplifier, can prevent the situation of burning machine from occurring on the one hand, makes power amplifier operation stability better on the other hand.
Description
Technical field
The utility model relates to power amplifier, especially a kind of DSP digital power amplifier circuit.
Background technology
Power amplifier is that the ultra-weak electronic signal from signal source is carried out the equipment that amplifies to drive loud speaker to sound.Traditional power amplifier is primarily of compositions such as audio input interface, signal amplification circuit, audio output interfaces.The general principle of power amplifier be source of sound equipment is inputted after comparatively small-signal is amplified, produce enough large electric current and go the loud speaker promoting different capacity to carry out the playback of sound.Owing to considering power, impedance, distortion, the dynamic and different scopes of application and regulating and controlling function, also different in the signal transacting of different power amplifiers in inside, line design and production technology.Transmission and the broadcasting of traditional analog amplifier technology owing to adopting the audio signal of simulation to carry out sound, easily be disturbed so have, limited transmission distance, maintenance management is complicated, autgmentability is not strong, the defects such as interactive difference, and just there is the restrictions such as the requirement that efficiency of energy utilization is not high, device coherence request is high from amplifier theory.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of digital power amplifier circuit, solves traditional analog power amplifier Problems existing.
For solving the problems of the technologies described above, the technical solution of the utility model is:
A kind of digital power amplifier circuit, comprise DSP, LCD display, AB class power amplifier, D class power amplifier, loudspeaker, bass horn, main power source and auxiliary power, outside source is input to DSP, carry out after Treatment Analysis through DSP, treble portion is by AB class power amplifier Direct driver loudspeaker, bass part is by D class power amplifier Direct driver bass horn, and described main power source powers to respectively AB class power amplifier and D class power amplifier, and auxiliary power is powered to DSP; Described DSP is connected with LCD display.
As improvement, described AB class power amplifier comprises the first switch mute circuit, first and falls power circuit, the first thermal-shutdown circuit, power protecting circuit, the first overcurrent current-limiting protection circuit, direct current protecting testing circuit, the first amplitude limiter circuit, AB power amplifier and loudspeaker; DSP high pitch input signal arrives loudspeaker after falling power circuit, AB power amplifier by the first switch mute circuit, first successively; Described first thermal-shutdown circuit is connected with power protecting circuit, is provided with hygrosensor and is connected with power discharging radiator, and described hygrosensor falls power circuit with first respectively and thermal-shutdown circuit is connected; Described first thermal-shutdown circuit, the first overcurrent current-limiting protection circuit, direct current protecting testing circuit, the first amplitude limiter circuit are connected with AB power amplifier; Described direct current protecting testing circuit is connected with power protecting circuit, and described first amplitude limiter circuit is by the input of optical coupler control AB power amplifier.
As improvement, described D class power amplifier comprises second switch mute circuit, second and falls power circuit, the second thermal-shutdown circuit, power protecting circuit, the second overcurrent current-limiting protection circuit, direct current protecting testing circuit, the second amplitude limiter circuit, D-type power amplifier and bass horn; DSP bass input signal arrives bass horn after falling power circuit, D-type power amplifier by second switch mute circuit, second successively; Described second thermal-shutdown circuit is connected with power protecting circuit, is provided with hygrosensor and is connected with power discharging radiator, and described hygrosensor falls power circuit with second respectively and the second thermal-shutdown circuit is connected; Described second thermal-shutdown circuit, the second overcurrent current-limiting protection circuit, direct current protecting testing circuit, the second amplitude limiter circuit are connected with D-type power amplifier; Described direct current protecting testing circuit is connected with power protecting circuit, and described second amplitude limiter circuit controls the input of D-type power amplifier by optical coupler.
As improvement, described direct current protecting testing circuit comprises electric capacity C72, triode Q12, triode Q13, triode Q14 and controllable silicon D29, the output of AB power amplifier and the output of D-type power amplifier are connected with the base stage of electric capacity C72 and triode Q12 respectively, the emitter of triode Q12 is connected with the base stage of triode Q13, the collector electrode of triode Q12 is connected with the base stage of triode Q14, the emitter of triode Q13 is connected with the base stage of triode Q12, the collector electrode of triode Q13 is connected with the base stage of triode Q14, the emitter of triode Q14 is connected with 12V direct voltage, the collector electrode of triode Q14 is by SCR control power protecting circuit, described power protecting circuit is connected with main power source.
As improvement, described first thermal-shutdown circuit comprises the first comparator, and described hygrosensor is connected with the input of the first comparator, and the output of the first comparator is connected with power protecting circuit.
As improvement, described first falls power circuit comprises the second comparator and the first metal-oxide-semiconductor, and described hygrosensor is connected with the input of the second comparator, and the output of the second comparator controls the first metal-oxide-semiconductor.
As improvement, described second thermal-shutdown circuit comprises the 3rd comparator, and described hygrosensor is connected with the input of the 3rd comparator, and the output of the 3rd comparator is connected with power protecting circuit.
As improvement, described second falls power circuit comprises the 4th comparator and the second metal-oxide-semiconductor, and described hygrosensor is connected with the input of the 4th comparator, and the output of the 4th comparator controls the second metal-oxide-semiconductor.
The beneficial effect that the utility model is compared with prior art brought is:
Digital power amplifier with DSP data processing has and is not easily disturbed, and maintenance management is simple, and autgmentability is strong, interactive good a little, more superior than traditional analog amplifier.
Accompanying drawing explanation
Fig. 1 is the utility model electrical diagram.
Fig. 2 is the electrical diagram of AB class power amplification circuit.
Fig. 3 is the electrical diagram of D class power amplification circuit.
Fig. 4 is the circuit theory diagrams of direct current protecting testing circuit.
Embodiment
Below in conjunction with Figure of description, the utility model is described in further detail.
As shown in Figure 1, a kind of digital power amplifier circuit, comprise DSP, LCD display, AB class power amplifier, D class power amplifier, loudspeaker, bass horn, main power source and auxiliary power, outside source is input to DSP, carry out after Treatment Analysis through DSP, treble portion is by AB class power amplifier Direct driver loudspeaker, and bass part is by D class power amplifier Direct driver bass horn, described main power source powers to respectively AB class power amplifier and D class power amplifier, and auxiliary power is powered to DSP; Described DSP is connected with LCD display.
As shown in Figure 2, described AB class power amplifier comprises the first switch mute circuit, first and falls power circuit, the first thermal-shutdown circuit, power protecting circuit, the first overcurrent current-limiting protection circuit, direct current protecting testing circuit, the first amplitude limiter circuit, AB power amplifier and loudspeaker; DSP high pitch input signal arrives loudspeaker after falling power circuit, AB power amplifier by the first switch mute circuit, first successively; Described first thermal-shutdown circuit is connected with power protecting circuit, is provided with hygrosensor and is connected with power discharging radiator, and described hygrosensor falls power circuit with first respectively and thermal-shutdown circuit is connected; Described first thermal-shutdown circuit, the first overcurrent current-limiting protection circuit, direct current protecting testing circuit, the first amplitude limiter circuit are connected with AB power amplifier; Described direct current protecting testing circuit is connected with power protecting circuit, and described first amplitude limiter circuit is by the input of optical coupler control AB power amplifier.Described first thermal-shutdown circuit comprises the first comparator, and described hygrosensor is connected with the input of the first comparator, and the output of the first comparator is connected with power protecting circuit; Judged the temperature of radiator by the first comparator, when radiator temperature is higher than the first comparator design temperature, driving power protective circuit disconnects the power supply of main power source.Described first falls power circuit comprises the second comparator and the first metal-oxide-semiconductor, and described hygrosensor is connected with the input of the second comparator, and the output of the second comparator controls the first metal-oxide-semiconductor; Judged the temperature of radiator by the second comparator, when radiator temperature is higher than the second comparator design temperature, drives the first metal-oxide-semiconductor to reduce the electric current input of AB power amplifier, reduce its operate power to reach.
As shown in Figure 3, described D class power amplifier comprises second switch mute circuit, second and falls power circuit, the second thermal-shutdown circuit, power protecting circuit, the second overcurrent current-limiting protection circuit, direct current protecting testing circuit, the second amplitude limiter circuit, D-type power amplifier and bass horn; DSP bass input signal arrives bass horn after falling power circuit, D-type power amplifier by second switch mute circuit, second successively; Described second thermal-shutdown circuit is connected with power protecting circuit, is provided with hygrosensor and is connected with power discharging radiator, and described hygrosensor falls power circuit with second respectively and the second thermal-shutdown circuit is connected; Described second thermal-shutdown circuit, the second overcurrent current-limiting protection circuit, direct current protecting testing circuit, the second amplitude limiter circuit are connected with D-type power amplifier; Described direct current protecting testing circuit is connected with power protecting circuit, and described second amplitude limiter circuit controls the input of D-type power amplifier by optical coupler.Described second thermal-shutdown circuit comprises the 3rd comparator, and described hygrosensor is connected with the input of the 3rd comparator, and the output of the 3rd comparator is connected with power protecting circuit; Judged the temperature of radiator by the 3rd comparator, when radiator temperature is higher than the 3rd comparator design temperature, driving power protective circuit disconnects the power supply of main power source.Described second falls power circuit comprises the 4th comparator and the second metal-oxide-semiconductor, and described hygrosensor is connected with the input of the 4th comparator, and the output of the 4th comparator controls the second metal-oxide-semiconductor; Judged the temperature of radiator by the 4th comparator, when radiator temperature is higher than the 4th comparator design temperature, drives the second metal-oxide-semiconductor to reduce the electric current input of D power amplifier, reduce its operate power to reach.
AB power-like amplifier and D-type power amplifier share a direct current protecting testing circuit.
As shown in Figure 4, described direct current protecting testing circuit comprises electric capacity C72, triode Q12, triode Q13, triode Q14 and controllable silicon D29.The output of AB power amplifier is connected with the base stage of electric capacity C72 and triode Q12 respectively by resistance R106 with R78 with the output of D-type power amplifier, electric capacity C72 ground connection, and resistance R79 is connected with triode Q12 base stage with electric capacity C72 one end, and the other end altogether; The emitter of triode Q12 is connected with the base stage of triode Q13, and the collector electrode of triode Q12 is connected with the base stage of triode Q14, and the emitter of triode Q13 is connected with the base stage of triode Q12, the base earth of triode Q13; The collector electrode of triode Q13 is connected with the base stage of triode Q14 by resistance R81, and the emitter of triode Q14 is connected with 12V direct voltage, is connected with resistance R80 parallel with one another and electric capacity C69 between the emitter of triode Q14 and base stage; The collector electrode of triode Q14 controls power protecting circuit by controllable silicon D29, and silicon controlled positive pole is connected with power protecting circuit, is connected with resistance R83 parallel with one another and electric capacity C74 between negative pole and control pole.Electric capacity C72 can elimination input alternating current; when the direct current being input to triode Q12 base stage is high potential; triode Q12 conducting; the base stage of triode Q14 is pulled to electronegative potential; because the emitter of triode Q14 is connected with high potential; the current collection very high potential of triode Q14, thus control silicon controlled conducting, finally complete the control to power protecting circuit.
Utility model works principle: the temperature of hygrosensor Real-Time Monitoring radiator, if radiator temperature exceedes preset value, representing that the power of power amplifier is too high, now reducing the input current of power amplifier by falling power circuit, to reduce its power output; When radiator temperature raises further, and when exceeding critical value, thermal-shutdown circuit driving power protective circuit cuts off the power supply of main power source, and power amplifier is quit work; When suitable value range is adjusted in the input of power amplifier, in order to enable power amplifier maintain normal operating conditions, by the input amplitude of amplitude limiter circuit limiting power amplifier; Direct current protecting testing circuit regulates and controls main power source by the output detecting high D-type power amplifier; Overcurrent current-limiting protection circuit, in order to the output of limiting power amplifier, maintains the normal work of compound horn.
Claims (8)
1. a digital power amplifier circuit, it is characterized in that: comprise DSP, LCD display, AB class power amplifier, D class power amplifier, loudspeaker, bass horn, main power source and auxiliary power, outside source is input to DSP, carry out after Treatment Analysis through DSP, treble portion is by AB class power amplifier Direct driver loudspeaker, bass part is by D class power amplifier Direct driver bass horn, and described main power source powers to respectively AB class power amplifier and D class power amplifier, and auxiliary power is powered to DSP; Described DSP is connected with LCD display.
2. digital power amplifier circuit according to claim 1, is characterized in that: described AB class power amplifier comprises the first switch mute circuit, first and falls power circuit, the first thermal-shutdown circuit, power protecting circuit, the first overcurrent current-limiting protection circuit, direct current protecting testing circuit, the first amplitude limiter circuit, AB power amplifier and loudspeaker; DSP high pitch input signal arrives loudspeaker after falling power circuit, AB power amplifier by the first switch mute circuit, first successively; Described first thermal-shutdown circuit is connected with power protecting circuit, is provided with hygrosensor and is connected with power discharging radiator, and described hygrosensor falls power circuit with first respectively and thermal-shutdown circuit is connected; Described first thermal-shutdown circuit, the first overcurrent current-limiting protection circuit, direct current protecting testing circuit, the first amplitude limiter circuit are connected with AB power amplifier; Described direct current protecting testing circuit is connected with power protecting circuit, and described first amplitude limiter circuit is by the input of optical coupler control AB power amplifier.
3. digital power amplifier circuit according to claim 1, is characterized in that: described D class power amplifier comprises second switch mute circuit, second and falls power circuit, the second thermal-shutdown circuit, power protecting circuit, the second overcurrent current-limiting protection circuit, direct current protecting testing circuit, the second amplitude limiter circuit, D-type power amplifier and bass horn; DSP bass input signal arrives bass horn after falling power circuit, D-type power amplifier by second switch mute circuit, second successively; Described second thermal-shutdown circuit is connected with power protecting circuit, is provided with hygrosensor and is connected with power discharging radiator, and described hygrosensor falls power circuit with second respectively and the second thermal-shutdown circuit is connected; Described second thermal-shutdown circuit, the second overcurrent current-limiting protection circuit, direct current protecting testing circuit, the second amplitude limiter circuit are connected with D-type power amplifier; Described direct current protecting testing circuit is connected with power protecting circuit, and described second amplitude limiter circuit controls the input of D-type power amplifier by optical coupler.
4. the digital power amplifier circuit according to Claims 2 or 3, it is characterized in that: described direct current protecting testing circuit comprises electric capacity C72, triode Q12, triode Q13, triode Q14 and controllable silicon D29, the output of AB power amplifier and the output of D-type power amplifier are connected with the base stage of electric capacity C72 and triode Q12 respectively, the emitter of triode Q12 is connected with the base stage of triode Q13, the collector electrode of triode Q12 is connected with the base stage of triode Q14, the emitter of triode Q13 is connected with the base stage of triode Q12, the collector electrode of triode Q13 is connected with the base stage of triode Q14, the emitter of triode Q14 is connected with 12V direct voltage, the collector electrode of triode Q14 is by SCR control power protecting circuit, described power protecting circuit is connected with main power source.
5. digital power amplifier circuit according to claim 2, is characterized in that: described first thermal-shutdown circuit comprises the first comparator, and described hygrosensor is connected with the input of the first comparator, and the output of the first comparator is connected with power protecting circuit.
6. digital power amplifier circuit according to claim 2, it is characterized in that: described first falls power circuit comprises the second comparator and the first metal-oxide-semiconductor, described hygrosensor is connected with the input of the second comparator, and the output of the second comparator controls the first metal-oxide-semiconductor.
7. digital power amplifier circuit according to claim 3, is characterized in that: described second thermal-shutdown circuit comprises the 3rd comparator, and described hygrosensor is connected with the input of the 3rd comparator, and the output of the 3rd comparator is connected with power protecting circuit.
8. digital power amplifier circuit according to claim 3, it is characterized in that: described second falls power circuit comprises the 4th comparator and the second metal-oxide-semiconductor, described hygrosensor is connected with the input of the 4th comparator, and the output of the 4th comparator controls the second metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420531045.7U CN204168480U (en) | 2014-09-16 | 2014-09-16 | Digital power amplifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420531045.7U CN204168480U (en) | 2014-09-16 | 2014-09-16 | Digital power amplifier circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204168480U true CN204168480U (en) | 2015-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420531045.7U Active CN204168480U (en) | 2014-09-16 | 2014-09-16 | Digital power amplifier circuit |
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| CN (1) | CN204168480U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108810730A (en) * | 2018-07-27 | 2018-11-13 | 广州酷狗计算机科技有限公司 | A kind of sound system |
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2014
- 2014-09-16 CN CN201420531045.7U patent/CN204168480U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108810730A (en) * | 2018-07-27 | 2018-11-13 | 广州酷狗计算机科技有限公司 | A kind of sound system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |