CN204168246U - AB class power amplifier - Google Patents
AB class power amplifier Download PDFInfo
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- CN204168246U CN204168246U CN201420530849.5U CN201420530849U CN204168246U CN 204168246 U CN204168246 U CN 204168246U CN 201420530849 U CN201420530849 U CN 201420530849U CN 204168246 U CN204168246 U CN 204168246U
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Abstract
A kind of AB class power amplifier, comprises DSP high pitched signal input circuit, switch mute circuit, falls power circuit, thermal-shutdown circuit, power protecting circuit, overcurrent current-limiting protection circuit, direct current protecting testing circuit, amplitude limiter circuit, AB power amplifier and loudspeaker; Described DSP high pitched signal input circuit output signal successively by switch mute circuit, fall after power circuit, AB power amplifier to loudspeaker; Described thermal-shutdown circuit is connected with power protecting circuit, is provided with hygrosensor and is connected with power discharging radiator, described hygrosensor respectively with power circuit falls and thermal-shutdown circuit is connected; Described thermal-shutdown circuit, overcurrent current-limiting protection circuit, direct current protecting testing circuit, amplitude limiter circuit are connected with AB power amplifier; Described direct current protecting testing circuit is connected with power protecting circuit, and described amplitude limiter circuit is by the input of optical coupler control AB power amplifier.The utility model has multinomial defencive function.
Description
Technical field
The utility model relates to power amplifier, in particular for driving the AB class power amplifier of loudspeaker.
Background technology
Audio frequency amplifier is widely used in home theater, sound system, stereo record-player, servo amplifier isoelectronic series system.People, while pursuit hi-fi audio power amplifier, also wish that power amplifier has large power output and high efficiency.Powerful audio frequency power amplifier output current is all greater than 1A, and power is larger, and output current is also larger.When there being big current to flow through power output pipe for a long time, when especially there is output short-circuit, power output pipe can be made to burn out.Therefore current foldback circuit must be had, restriction maximum output current, protection efferent duct.Secondly under different voltage condition, the maximum output current ability of efferent duct is also different, if only limiting efferent duct electric current is a specific electric current, then when mains voltage variations, even if there is current-limiting protection circuit, power output pipe also likely burns out.Therefore power amplifier efferent duct not only needs overcurrent protection also to need under different voltage, and the electric current of this protection also will change.Therefore we are power defencive function at the protecting circuit designed of efferent duct, and namely when supply voltage height, protective current reduces; When power electric is forced down, protective current increases, and ensures that power output pipe is not burned with this.Current AB class power amplifier lacks effective circuit protection circuit, causes power amplifier to be easily burned.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of AB class power amplifier, and good stability, has multinomial defencive function.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of AB class power amplifier, comprises DSP high pitched signal input circuit, switch mute circuit, falls power circuit, thermal-shutdown circuit, power protecting circuit, overcurrent current-limiting protection circuit, direct current protecting testing circuit, amplitude limiter circuit, AB power amplifier and loudspeaker; Described DSP high pitched signal input circuit output signal successively by switch mute circuit, fall after power circuit, AB power amplifier to loudspeaker; Described thermal-shutdown circuit is connected with power protecting circuit, is provided with hygrosensor and is connected with power discharging radiator, described hygrosensor respectively with power circuit falls and thermal-shutdown circuit is connected; Described thermal-shutdown circuit, overcurrent current-limiting protection circuit, direct current protecting testing circuit, amplitude limiter circuit are connected with AB power amplifier; Described direct current protecting testing circuit is connected with power protecting circuit, and described amplitude limiter circuit is by the input of optical coupler control AB power amplifier.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 AB power amplifier by falling power circuit, to reduce its power output; When radiator temperature raises further, and when exceeding critical value, the power supply that thermal-shutdown circuit driving power protective circuit is cut off the electricity supply, makes power amplifier quit work; When suitable value range is adjusted in the input of AB power amplifier, in order to enable power amplifier maintain normal operating conditions, by the input amplitude of amplitude limiter circuit restriction AB power amplifier; Direct current protecting testing circuit regulates and controls power supply by the output detecting AB power amplifier; Overcurrent current-limiting protection circuit, in order to limit the output of AB power amplifier, maintains the normal work of loudspeaker.
As improvement, described direct current protecting testing circuit comprises electric capacity C72, triode Q12, triode Q13, triode Q14 and controllable silicon D29, the input of direct current protecting testing circuit is 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.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.
As improvement, described 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.The temperature of radiator is judged by the first comparator, when radiator temperature is higher than the first comparator design temperature, the power supply of driving power protective circuit deenergization.
As improvement, described in fall power circuit and comprise the second comparator and metal-oxide-semiconductor, described hygrosensor is connected with the input of the second comparator, and the output of the second comparator controls metal-oxide-semiconductor.Judged the temperature of radiator by the second comparator, when radiator temperature is higher than the second comparator design temperature, driven MOS pipe reduces the electric current input of AB power amplifier, reduces its operate power to reach.
The utility model with there being the beneficial effect brought compared with technology is:
The utility model has multinomial defencive function: 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 AB power amplifier by falling power circuit, to reduce its power output; When radiator temperature raises further, and when exceeding critical value, the power supply that thermal-shutdown circuit driving power protective circuit is cut off the electricity supply, makes power amplifier quit work; When suitable value range is adjusted in the input of AB power amplifier, in order to enable power amplifier maintain normal operating conditions, by the input amplitude of amplitude limiter circuit restriction AB power amplifier; Direct current protecting testing circuit regulates and controls power supply by the output detecting AB power amplifier; Overcurrent current-limiting protection circuit, in order to limit the output of AB power amplifier, maintains the normal work of loudspeaker.
Accompanying drawing explanation
Fig. 1 is the utility model electrical diagram.
Fig. 2 is the utility model circuit theory diagrams.
Fig. 3 is direct current protecting testing circuit circuit theory diagrams.
Embodiment
Below in conjunction with Figure of description, the utility model is described in further detail.
As shown in Figure 1, 2; a kind of AB class power amplifier, comprises DSP high pitched signal input circuit, switch mute circuit, falls power circuit, thermal-shutdown circuit, power protecting circuit, overcurrent current-limiting protection circuit, direct current protecting testing circuit, amplitude limiter circuit, AB power amplifier and loudspeaker.Described DSP high pitched signal input circuit output signal successively by switch mute circuit, fall after power circuit, AB power amplifier to loudspeaker; Described thermal-shutdown circuit is connected with power protecting circuit, is provided with hygrosensor and is connected with power discharging radiator, described hygrosensor respectively with power circuit falls and thermal-shutdown circuit is connected; Described thermal-shutdown circuit, overcurrent current-limiting protection circuit, direct current protecting testing circuit, amplitude limiter circuit are connected with AB power amplifier; Described direct current protecting testing circuit is connected with power protecting circuit, and described amplitude limiter circuit is by the input of optical coupler control AB power amplifier.
As shown in Figure 3, described direct current protecting testing circuit comprises electric capacity C72, triode Q12, triode Q13, triode Q14 and controllable silicon, the input of direct current protecting testing circuit is 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 controls power protecting circuit by controllable silicon D29.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.
Described 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.The temperature of radiator is judged by the first comparator, when radiator temperature is higher than the first comparator design temperature, the power supply of driving power protective circuit deenergization.
The described power circuit that falls comprises the second comparator and metal-oxide-semiconductor, and described hygrosensor is connected with the input of the second comparator, and the output of the second comparator controls metal-oxide-semiconductor.Judged the temperature of radiator by the second comparator, when radiator temperature is higher than the second comparator design temperature, driven MOS pipe reduces the electric current input of AB power amplifier, reduces its operate power to reach.
The utility model has multinomial defencive function: 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 AB power amplifier by falling power circuit, to reduce its power output; When radiator temperature raises further, and when exceeding critical value, the power supply that thermal-shutdown circuit driving power protective circuit is cut off the electricity supply, makes power amplifier quit work; When suitable value range is adjusted in the input of AB power amplifier, in order to enable power amplifier maintain normal operating conditions, by the input amplitude of amplitude limiter circuit restriction AB power amplifier; Direct current protecting testing circuit regulates and controls power supply by the output detecting AB power amplifier; Overcurrent current-limiting protection circuit, in order to limit the output of AB power amplifier, maintains the normal work of loudspeaker.
Claims (4)
1. an AB class power amplifier, is characterized in that: comprise DSP high pitched signal input circuit, switch mute circuit, fall power circuit, thermal-shutdown circuit, power protecting circuit, overcurrent current-limiting protection circuit, direct current protecting testing circuit, amplitude limiter circuit, AB power amplifier and loudspeaker; Described DSP high pitched signal input circuit output signal successively by switch mute circuit, fall after power circuit, AB power amplifier to loudspeaker; Described thermal-shutdown circuit is connected with power protecting circuit, is provided with hygrosensor and is connected with power discharging radiator, described hygrosensor respectively with power circuit falls and thermal-shutdown circuit is connected; Described thermal-shutdown circuit, overcurrent current-limiting protection circuit, direct current protecting testing circuit, amplitude limiter circuit are connected with AB power amplifier; Described direct current protecting testing circuit is connected with power protecting circuit, and described amplitude limiter circuit is by the input of optical coupler control AB power amplifier.
2. AB class power amplifier according to claim 1, it is characterized in that: described direct current protecting testing circuit comprises electric capacity C72, triode Q12, triode Q13, triode Q14 and controllable silicon, the input of direct current protecting testing circuit is 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.
3. AB class power amplifier according to claim 1, it is characterized in that: described thermal-shutdown circuit comprises the first comparator, described hygrosensor is connected with the input of the first comparator, and the output of the first comparator is connected with power protecting circuit.
4. AB class power amplifier according to claim 1, is characterized in that: described in fall power circuit and comprise the second comparator and metal-oxide-semiconductor, described hygrosensor is connected with the input of the second comparator, and the output of the second comparator controls metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420530849.5U CN204168246U (en) | 2014-09-16 | 2014-09-16 | AB class power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420530849.5U CN204168246U (en) | 2014-09-16 | 2014-09-16 | AB class power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204168246U true CN204168246U (en) | 2015-02-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420530849.5U Active CN204168246U (en) | 2014-09-16 | 2014-09-16 | AB class power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204168246U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021032293A1 (en) * | 2019-08-21 | 2021-02-25 | Volvo Truck Corporation | A method for optimizing energy management of an electrical propulsion system of a vehicle |
| CN116707460A (en) * | 2023-03-14 | 2023-09-05 | 深圳市晶扬电子有限公司 | Protection circuit of audio power amplifier |
-
2014
- 2014-09-16 CN CN201420530849.5U patent/CN204168246U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021032293A1 (en) * | 2019-08-21 | 2021-02-25 | Volvo Truck Corporation | A method for optimizing energy management of an electrical propulsion system of a vehicle |
| CN114269591A (en) * | 2019-08-21 | 2022-04-01 | 沃尔沃卡车集团 | Method for optimizing the energy management of an electric propulsion system of a vehicle |
| CN116707460A (en) * | 2023-03-14 | 2023-09-05 | 深圳市晶扬电子有限公司 | Protection circuit of audio power amplifier |
| CN116707460B (en) * | 2023-03-14 | 2024-01-23 | 深圳市晶扬电子有限公司 | Protection circuit of audio power amplifier |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |