CN201039451Y - Stereo sound accompanying power amplification circuit - Google Patents
Stereo sound accompanying power amplification circuit Download PDFInfo
- Publication number
- CN201039451Y CN201039451Y CNU2007200213713U CN200720021371U CN201039451Y CN 201039451 Y CN201039451 Y CN 201039451Y CN U2007200213713 U CNU2007200213713 U CN U2007200213713U CN 200720021371 U CN200720021371 U CN 200720021371U CN 201039451 Y CN201039451 Y CN 201039451Y
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Abstract
The utility model discloses a dimensional sound digital sound accompanying power amplifying circuit of a vehicle loaded television. The circuit comprises a power source, an integral power amplifying chip, an audio inputting circuit and an audio outputting circuit; the audio inputting circuit is firstly connected with the integral power amplifying chip which is then connected with the audio outputting circuit. The circuit realizes the very practical over-current protecting function and over-hot protecting function in the vehicle load mounting and use and has the advantages of small volume and light weight; the circuit is easy to be positioned in a complete appliance; a plurality of practical protecting functions provide guarantee to the safe and reliable work of the complete appliance.
Description
Technical field
The utility model relates to a kind of stereo audio power amplifier circuit, particularly the stereo digital accompaniment power amplifier of in-car TV.
Background technology
Along with the progress of industrial technology, people's lives are rich gradually, and automobile becomes popular necessity.People are more and more longer because of the time of commercial affairs or leisure use car, and in order to reduce the uninteresting sense of passenger's travelling, the in-car TV system is installed in car becomes a kind of trend gradually.
At present; in-car TV is on the function that realizes high-power stereo sound accompaniment output; there is the circuit structure complexity; efficient is low; the not strong shortcoming of beautiful audio fruit; in use take place not have overcurrent and overtemperature protection causes the subelement of circuit to burn, bring great inconvenience for consumer's use because of circuit through regular meeting.
The utility model content
The purpose of this utility model is to overcome above-mentioned shortcoming and defect, and a kind of high efficiency is provided, and circuit structure is simple, and the stereo audio power amplifier circuit of complete function.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
Stereo audio power amplifier circuit, it comprises: power supply, integrated amplifier chip, audio frequency input circuit and audio output circuit, described power supply is connected respectively with integrated amplifier chip, audio output circuit, the audio frequency input circuit at first is connected with the integrated amplifier chip, and the integrated amplifier chip is connected with audio output circuit more then.
Above-mentioned power supply is connected with the power mode control pin and the control circuit power supply input pin of integrated amplifier chip respectively, between power supply and the power mode control pin switch is set, and protective resistance one end directly is connected with the power mode control pin, other end ground connection.
Above-mentioned switch adopts one pole unit's switch.
Above-mentioned power supply is connected respectively with the L channel power supply input pin and the R channel power supply input pin of integrated amplifier chip.
Above-mentioned integrated amplifier chip is selected the chip with overcurrent protection function and overheat protective function for use.
The short-circuit detecting pin of above-mentioned integrated amplifier chip is connected by a change over switch with quiet pin.
Above-mentioned change over switch adopts the one pole on-off switch, and the movable utmost point of this switch is connected with quiet pin, and one of two clamping position are connected another ground connection with the short-circuit detecting pin.
The beneficial effects of the utility model are: circuit is simple and reliable, efficient is high, has realized powerful sound accompaniment output with lower circuit cost, and has realized overcurrent protection function and overheat protective function very practical in vehicle-mounted installation and use.It is little, in light weight that this circuit also has a circuit board volume, is easy to be built in complete machine, and the defencive function of multiple practicality is for complete machine safety, work guarantee is provided reliably.
Description of drawings
Fig. 1 is the system block diagram of the stereo audio power amplifier circuit of the utility model;
Fig. 2 is the part connection layout of integrated amplifier chip periphery circuit.
Below in conjunction with accompanying drawing embodiment of the present utility model is described:
Embodiment
In conjunction with Fig. 1, Fig. 2, stereo audio power amplifier circuit, it comprises: power supply, integrated amplifier chip, audio frequency input circuit and audio output circuit, and the audio frequency input circuit at first is connected with the integrated amplifier chip, and the integrated amplifier chip is connected with audio output circuit more then.
Power supply is connected respectively with the power mode control pin and the control circuit power supply input pin of integrated amplifier chip, and a switch JP2 is set between power supply and the power mode control pin, and JP2 is a single-phase unit switch.Protective resistance R9 one end directly is connected with the power mode control pin, other end ground connection.Power supply also has other two connecting lines to be connected respectively with the L channel power supply input pin and the R channel power supply input pin of integrated amplifier chip.
Integrated amplifier chip with overcurrent protection function and overheat protective function; its short-circuit detecting pin is connected by one pole on-off switch JP1 with quiet pin; the movable utmost point of JP1 is connected with quiet pin, and one of the two clamping position of JP1 are connected another ground connection with the short-circuit detecting pin.
The realization of overcurrent protection function: during this power amplifier normal mode of operation, the quiet pin of regulating the integrated amplifier chip by switch JP1 is connected with the short-circuit detecting pin, and this moment, two pins were high level.Audio output circuit can be closed immediately after the current value that passes through on each output of circuit surpasses set point, the short-circuit detecting pin of this moment becomes low level, quiet pin makes circuit enter mute state when low level, after the current value that passes through on each output of circuit is reduced under the set point, this moment, the short-circuit detecting pin became high level, and circuit is removed mute state and is returned to normal mode of operation.This process is changed the high-low level of short-circuit detecting pin fully by the integrated amplifier chip; control circuit enters or removes mute state; if over-current phenomenon avoidance can't be removed always; the integrated amplifier chip can constantly circulate in " close, remove, close, remove " state; in order not make the integrated amplifier chip because of under long-time over-current state, crossing cause thermal damage; the time set of mute state was at 1～2 second; audio output circuit is closed afterwards, must start shooting again over-current phenomenon avoidance is removed and protective circuit could be reset to normal condition.If quiet pin is open-circuit condition, audio output circuit can close and can not remove immediately after the current value that passes through on each output of circuit surpasses set point, must start shooting again over-current phenomenon avoidance is removed and protective circuit could be reset to normal condition.
When stereo audio power amplifier circuit; during long-time high power work; integrated amplifier chip internal temperature is raise; integrated amplifier chip enable temperature protection function is closed audio output circuit after the chip internal temperature surpasses 150 ℃; audio output circuit restarts after temperature drops to 100 ℃, the overheat protective function of Here it is this circuit.
The realization of mute function is started by switch JP1; this moment, the quiet pin of integrated amplifier chip was connected with the clamping position of ground connection; under the situation of electronegative potential; the integrated amplifier chip enters mute state; when quiet pin unsettled; the integrated amplifier chip can be replied normal condition after 1～2 second, at this moment make sure to keep in mind with switch JP1 the quiet pin of integrated amplifier chip to be connected with the short-circuit detecting pin, could realize overcurrent protection function.
Finishing of low-power mode: the movable utmost point of switch JP2 is become open-circuit condition; the power mode control pin of the integrated amplifier chip of this moment is connected with protective resistance R9 and ground connection; this moment, this pin became low level state; stereo audio power amplifier circuit enters low-power mode when this pin is low level; audio output circuit is closed output, and it is following to save power consumption that electric current is reduced to 1mA simultaneously.The JP2 activity is extremely closed, and power supply is connected with the power mode control pin of integrated amplifier chip, and this moment, this pin was a high level, and circuit is returned to normal operating conditions.
Execution mode 2
In conjunction with Fig. 1, Fig. 2, stereo audio power amplifier circuit, it comprises: power supply, integrated amplifier chip, audio frequency input circuit and audio output circuit, the audio frequency input circuit at first is connected with the integrated amplifier chip, the integrated amplifier chip is connected with audio output circuit more then, and the integrated amplifier chip is selected the PT2336 chip for use.
Power supply is connected respectively with power mode control pin 33 pins and control circuit power supply input pin 8 pins of PT2336 chip, and a switch JP2 is set between power supply and 33 pins, and JP2 is a single-phase unit switch.Protective resistance R9 one end directly is connected with 33 pins, other end ground connection.Power supply also has other two connecting lines to be connected respectively with L channel power supply input pin 39,40 pins and R channel power supply input pin 45,46 pins of PT2336 chip.
Integrated amplifier chip PT2336 with overcurrent protection function and overheat protective function; its short-circuit detecting pin 4 pins are connected by one pole on-off switch JP1 with quiet pin 5 pins; the movable utmost point 1 of JP1 is connected with 5 pins; the clamping position 2 of JP1 is connected with 4 pins of chip PT2336, and clamping position 3 is by protective resistance R ground connection.
The realization of overcurrent protection function: during this power amplifier normal mode of operation, 4 pins of regulating the integrated amplifier chip by switch JP1 are connected with 5 pins, and this moment, two pins were high level.Audio output circuit can be closed immediately after the current value that passes through on each output of circuit surpasses set point, 4 pins of this moment become low level, 5 pins make circuit enter mute state when low level, after the current value that passes through on each output of circuit is reduced under the set point, this moment, 4 pins became high level, and circuit is removed mute state and is returned to normal mode of operation.This process is changed the high-low level of 4 pins fully by the integrated amplifier chip; control circuit enters or removes mute state; if over-current phenomenon avoidance can't be removed always; the PT2336 chip can constantly circulate in " close, remove, close, remove " state; in order not make the PT2336 chip because of under long-time over-current state, crossing cause thermal damage; the time set of mute state was at 1～2 second; audio output circuit is closed afterwards, must start shooting again over-current phenomenon avoidance is removed and protective circuit could be reset to normal condition.If 5 pins are open-circuit condition, audio output circuit can close and can not remove immediately after the current value that passes through on each output of circuit surpasses set point, must start shooting again over-current phenomenon avoidance is removed and protective circuit could be reset to normal condition.
When stereo audio power amplifier circuit; during long-time high power work; PT2336 chip internal temperature is raise; PT2336 chip enable temperature protection function is closed audio output circuit after the chip internal temperature surpasses 150 ℃; audio output circuit restarts after temperature drops to 100 ℃, the overheat protective function of Here it is this circuit.
The realization of mute function is started by switch JP1, and this moment, 5 pins of PT2336 chip were connected with the clamping position 3 of ground connection, were under the situation of electronegative potential at 5 pins, and the PT2336 chip enters mute state.Unsettled when 5 pins, the PT2336 chip can be replied normal condition after 1～2 second, at this moment made sure to keep in mind with switch JP1 4 pins of PT2336 chip to be connected with 5 pins, could realize overcurrent protection function.
Above-mentioned mute function can also adopt the movable utmost point 1 of JP1 unsettled, gets a short-term one end is connected on 5 pins, and the other end is connected to earth connection, and this moment, 5 pins were electronegative potential, and the PT2336 chip enters mute state.After short-term removed, the PT2336 chip can be replied normal condition after 1～2 second, at this moment made sure to keep in mind 4 pins of PT2336 chip are connected with 5 pins, could realize overcurrent protection function.
Finishing of low-power mode: the movable utmost point of switch JP2 is become open-circuit condition; this moment, 33 pins of PT2336 chip were connected with protective resistance R9 and ground connection; this moment, 33 pins became low level state; stereo audio power amplifier circuit enters low-power mode when this pin is low level; audio output circuit is closed output, and it is following to save power consumption that electric current is reduced to 1mA simultaneously.The JP2 activity is extremely closed, and power supply is connected with 33 pins of PT2336 chip, and this moment, this pin was a high level, and circuit is returned to normal operating conditions.
The utility model has been realized high-power by above simple circuit structure, high efficiency sound accompaniment output, and realized overcurrent protection function and overheat protective function very practical in vehicle-mounted installation and use.Certain above-mentioned explanation is not to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example; variation, remodeling, interpolation or replacement that those skilled in the art are made in the utility model essential scope also belong to protection range of the present utility model.
Claims (7)
1. stereo audio power amplifier circuit, it comprises: power supply, integrated amplifier chip, audio frequency input circuit and audio output circuit, it is characterized in that: described power supply is connected respectively with integrated amplifier chip, audio output circuit, the audio frequency input circuit at first is connected with the integrated amplifier chip, and the integrated amplifier chip is connected with audio output circuit more then.
2. stereo audio power amplifier circuit according to claim 1; it is characterized in that: described power supply is connected with the power mode control pin and the control circuit power supply input pin of integrated amplifier chip respectively; between power supply and the power mode control pin switch is set; protective resistance one end directly is connected with the power mode control pin, other end ground connection.
3. stereo audio power amplifier circuit according to claim 2 is characterized in that: described switch adopts one pole unit's switch.
4. stereo audio power amplifier circuit according to claim 1 is characterized in that: described power supply is connected respectively with the L channel power supply input pin and the R channel power supply input pin of integrated amplifier chip.
5. stereo audio power amplifier circuit according to claim 1 and 2 is characterized in that: described integrated amplifier chip is selected the chip with overcurrent protection function and overheat protective function for use.
6. stereo audio power amplifier circuit according to claim 1 and 2 is characterized in that: the short-circuit detecting pin of described integrated amplifier chip is connected by a change over switch with quiet pin.
7. stereo audio power amplifier circuit according to claim 6 is characterized in that: described change over switch adopts the one pole on-off switch, and the movable utmost point of this switch is connected with quiet pin, and one of two clamping position are connected another ground connection with the short-circuit detecting pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200213713U CN201039451Y (en) | 2007-05-10 | 2007-05-10 | Stereo sound accompanying power amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200213713U CN201039451Y (en) | 2007-05-10 | 2007-05-10 | Stereo sound accompanying power amplification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201039451Y true CN201039451Y (en) | 2008-03-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200213713U Expired - Fee Related CN201039451Y (en) | 2007-05-10 | 2007-05-10 | Stereo sound accompanying power amplification circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201039451Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102883256A (en) * | 2012-09-25 | 2013-01-16 | 浙江吉利汽车研究院有限公司杭州分公司 | High temperature alarming system and method for automobile sound equipment |
| CN103152671A (en) * | 2013-03-15 | 2013-06-12 | 珠海市杰理科技有限公司 | Audio input/output circuit |
| CN103595028A (en) * | 2013-11-20 | 2014-02-19 | 桂林机床电器有限公司 | Anti-overheating switch adjustment modular circuit |
| WO2021147208A1 (en) * | 2020-01-20 | 2021-07-29 | Beijing Didi Infinity Technology And Development Co., Ltd. | Methods and systems for monitoring an on-board equipment |
-
2007
- 2007-05-10 CN CNU2007200213713U patent/CN201039451Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102883256A (en) * | 2012-09-25 | 2013-01-16 | 浙江吉利汽车研究院有限公司杭州分公司 | High temperature alarming system and method for automobile sound equipment |
| CN102883256B (en) * | 2012-09-25 | 2017-02-01 | 浙江吉利汽车研究院有限公司杭州分公司 | High temperature alarming system and method for automobile sound equipment |
| CN103152671A (en) * | 2013-03-15 | 2013-06-12 | 珠海市杰理科技有限公司 | Audio input/output circuit |
| CN103595028A (en) * | 2013-11-20 | 2014-02-19 | 桂林机床电器有限公司 | Anti-overheating switch adjustment modular circuit |
| CN103595028B (en) * | 2013-11-20 | 2017-03-15 | 广东智卓通信科技有限公司 | A kind of overheating proof switch adjusting module circuit |
| WO2021147208A1 (en) * | 2020-01-20 | 2021-07-29 | Beijing Didi Infinity Technology And Development Co., Ltd. | Methods and systems for monitoring an on-board equipment |
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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: 20080319 Termination date: 20110510 |