CN201248028Y - Triggering circuit, audio power amplifier system and television set - Google Patents
Triggering circuit, audio power amplifier system and television set Download PDFInfo
- Publication number
- CN201248028Y CN201248028Y CNU2008200953214U CN200820095321U CN201248028Y CN 201248028 Y CN201248028 Y CN 201248028Y CN U2008200953214 U CNU2008200953214 U CN U2008200953214U CN 200820095321 U CN200820095321 U CN 200820095321U CN 201248028 Y CN201248028 Y CN 201248028Y
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Abstract
The utility model is suitable for the power amplifier field and provides a trigger circuit, an audio power amplification system, and a TV. The trigger circuit comprises a first resistor, a switch tube, a second resistor and a capacitor, wherein the emitting electrode of the switch tube is electrically connected with a power supply through the first resistor, the base electrode of the switch tube is grounded through the capacitor and is electrically connected with the power supply through the second resistor, and the collecting electrode of the switch tube outputs high level pulse signals. The utility model provides the trigger circuit which outputs the high level pulse signals during the breath of starting the power amplification system to control a mute control foot so as to cause accompanying sound to be in a mute state, thereby the impact sound produced in the breath of starting the power amplification system is eliminated.
Description
Technical field
The utility model belongs to the power amplifier field, relates in particular to a kind of circuits for triggering, audio frequency power amplifier system and television set.
Background technology
At present, comprise in the power amplification system of sound accompaniment treatment system of a lot of electrical equipment of television set that a quiet control pin is arranged, the high/low level of I/O mouth output that can be by MCU be controlled above-mentioned quiet control pin, makes sound accompaniment be in mute state.
Yet, in the moment of television boot-strap, MCU is in disordered state out of control, instantaneous impulse current pulse train is to voicefrequency circuit, will form the impulsive sound of " pouncing on ", " pouncing on " again to loud speaker by power amplifier, though this is to the not influence of aspects such as security of products, reliability, the mood that can extremely dampen the consumer.
The utility model content
The purpose of this utility model is to provide a kind of circuits for triggering, is intended to solve existing power amplification system and is in disordered state out of control moment that causes starting shooting in the moment of start and produces the problem of impulsive sound.
The utility model is achieved in that a kind of circuits for triggering, comprising:
First resistance, switching tube, second resistance and electric capacity;
The emitter of described switching tube is electrically connected with power supply by first resistance; Its base stage also is electrically connected with power supply by second resistance by capacity earth; Its collector electrode output high level pulse signal.
Another purpose of the present utility model is to provide a kind of audio frequency power amplifier system that adopts above-mentioned circuits for triggering.
Another purpose of the present utility model also is to provide a kind of television set that adopts above-mentioned audio frequency power amplifier system.
The utility model provides a kind of circuits for triggering, at the quiet control pin of the moment of power amplification system start output high level pulse signal controlling, makes sound accompaniment be in mute state, thereby has eliminated the impulsive sound of power amplification system in start moment generation.
Description of drawings
Fig. 1 is the circuit diagram of the circuits for triggering that provide of the utility model embodiment;
Fig. 2 is the principle schematic of switching tube Q1 in the circuits for triggering that provide of the utility model embodiment;
Fig. 3 is that circuits for triggering that the utility model embodiment provides are applied to the circuit diagram in the audio frequency power amplifier system.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The utility model embodiment provides a kind of circuits for triggering, at the quiet control pin of the moment of power amplification system start output high level pulse signal controlling, makes sound accompaniment be in mute state, thereby has eliminated the impulsive sound of power amplification system in start moment generation.
The circuits for triggering that the utility model embodiment provides are mainly used in audio frequency power amplifier system and the television set, and its circuit diagram for convenience of explanation, only shows the part relevant with the utility model embodiment as shown in Figure 1, and details are as follows.
Circuits for triggering comprise: first resistance R 1, switching tube Q1, second resistance R 2 and capacitor C 1; Wherein, the emitter of switching tube Q1 is connected with power supply VCC by first resistance R 1; Its base stage also is connected with power supply VCC by second resistance R 2 by capacitor C 1 ground connection; Its collector electrode output high level pulse signal.As an embodiment of the present utility model, second resistance R 2 is an adjustable resistance, and resistance is as far as possible close with the resistance of first resistance R 1 or equate.As another embodiment of the present utility model, capacitor C 1 is a tunable capacitor.
In the utility model embodiment, circuits for triggering also comprise the 3rd resistance R 3, and the one end is connected to the base stage of switching tube Q1, other end ground connection.As an embodiment of the present utility model, the resistance of the 3rd resistance R 3 is far longer than the resistance of second resistance R 2.As another embodiment of the present utility model, switching tube Q1 is the positive-negative-positive triode.
Fig. 2 is the principle schematic of switching tube Q1, existing describes the operation principle of the circuits for triggering that the utility model embodiment provides according to Fig. 1 in conjunction with Fig. 2, and details are as follows.
Starting shooting moment, the emitter voltage Ve of switching tube Q1 rises to supply voltage VCC rapidly, supply voltage VCC charges to capacitor C 1 simultaneously, because supply voltage VCC charges to capacitor C 1 and needs a period of time, so the base voltage Vb1 of switching tube Q1 rises to supply voltage VCC a delay is arranged in time; In the time period of this delay, if the difference of emitter voltage Ve and base voltage Vb1 is greater than 0.6V, then switching tube Q1 conducting, quiet control pin of high level pulse signal controlling of collector electrode output by switching tube Q1, make sound accompaniment be in mute state, thereby eliminated the impulsive sound of power amplification system in start moment generation.
As shown in Figure 2, T1 is the ON time of switching tube Q1, and Vb1 is the base voltage of any time switching tube Q1, Ve is the emitter voltage of switching tube Q1, Vb is the base voltage that electric capacity is full of back switching tube Q1, as long as satisfy Ve-Vb1〉0.6V, then switching tube Q1 conducting.
Regulate the resistance of second resistance R 2 and the appearance value of capacitor C 1, can realize adjustment the ON time T1 of switching tube Q1.For example, increase the resistance of second resistance R 2 or the appearance value of increase capacitor C 1, can increase the ON time T1 of switching tube Q1; Reduce the resistance of second resistance R 2 or reduce the appearance value of capacitor C 1, can reduce the ON time T1 of switching tube Q1.
When capacitor C 1 was full of electricity, the emitter voltage Ve of switching tube Q1 equated substantially that with base voltage Vb switching tube Q1 is in cut-off state, and at this moment, the electric weight of capacitor C 1 cannot discharge, and bad influence can be arranged the safety of components and parts; Therefore, need in circuits for triggering, increase the 3rd resistance R 3, the three resistance R 3 and form quick bleed-off circuit, make when switching tube Q1 is in cut-off state with capacitor C 1, the electric weight of capacitor C 1 can progressively discharge by the 3rd resistance R 3, and the 3rd resistance R 3 resistances are generally about 100K Ω.
The circuits for triggering that Fig. 3 shows the utility model embodiment to be provided are applied to the circuit diagram in the audio frequency power amplifier system, for convenience of explanation, only show the part relevant with the utility model embodiment, and details are as follows.
The resistance R 4 that the audio frequency power amplifier system comprises circuits for triggering 21 and is connected circuits for triggering 21 outputs, R5, R6 and switching tube Q2, wherein the base stage of switching tube Q2 is connected with the collector electrode of switching tube Q1 by resistance R 4, also connect a MCU control level signal simultaneously by diode D1, the grounded emitter of switching tube Q2, the collector electrode of switching tube Q2 is by resistance R 5, R6 is connected to power vd D, export a quiet level signal at the link of resistance R 5 and resistance R 6, control quiet control pin 30, make sound accompaniment be in mute state, thereby eliminated the impulsive sound of power amplification system in start moment generation.
In the moment of start, MCU is in disordered state out of control, the quick conducting of switching tube Q1, its collector electrode output high level pulse signal, the quiet control pin 30 of control power amplifier, make power amplifier be in quiet state, thereby effectively eliminated " pouncing on ", " pouncing on " impulsive sound of start moment generation in the moment of start; When capacitor C 1 is full of electricity, the emitter voltage of switching tube Q1 equates substantially with base voltage, switching tube Q1 is in cut-off state, at this moment, resetting of MCU finished, thereby come the conduction and cut-off of control switch pipe Q2 to control quiet control pin 30 by MCU control level signal by the high/low control level of diode D1 output, make sound accompaniment be in quiet or normal condition.
Power vd D is slower than the speed that powers on of power supply VCC, but power vd D must finish in conduction period at Q1 and powers on.Equally, resistance R 5, R6 are adjustable resistance, and by regulating the resistance of resistance R 5, R6, the size of the voltage control signal of the link output of controlling resistance R5 and resistance R 6 is with the demand of the voltage that satisfies the quiet control pin 30 in the different audio frequency power amplifier system.
The circuits for triggering that the utility model embodiment provides at the quiet control pin of the moment of power amplification system start output high level pulse signal controlling, make sound accompaniment be in mute state, thereby have eliminated the impulsive sound of power amplification system in start moment generation; The cost of this circuit is low simultaneously, reliability is high, simple and practical.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (9)
1, a kind of circuits for triggering is characterized in that, described circuits for triggering comprise:
First resistance, switching tube, second resistance and electric capacity;
The emitter of described switching tube is electrically connected with power supply by first resistance; Its base stage also is electrically connected with power supply by second resistance by capacity earth; Its collector electrode output high level pulse signal.
2, circuits for triggering as claimed in claim 1 is characterized in that, described electric capacity is tunable capacitor.
3, circuits for triggering as claimed in claim 1 is characterized in that, described second resistance is adjustable resistance.
4, circuits for triggering as claimed in claim 1 is characterized in that, the resistance of described second resistance equates with the resistance of described first resistance.
5, circuits for triggering as claimed in claim 1 is characterized in that, described circuits for triggering also comprise the 3rd resistance, and the one end is connected to the base stage of described switching tube, other end ground connection.
6, circuits for triggering as claimed in claim 5 is characterized in that, the resistance of described the 3rd resistance is greater than the resistance of described second resistance.
7, circuits for triggering as claimed in claim 1 is characterized in that, described switching tube is the positive-negative-positive triode.
8, a kind of audio frequency power amplifier system is characterized in that, described audio frequency power amplifier system comprises each described circuits for triggering of claim 1 to 7.
9, a kind of television set is characterized in that, described television set comprises the described audio frequency power amplifier of claim 8 system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200953214U CN201248028Y (en) | 2008-07-04 | 2008-07-04 | Triggering circuit, audio power amplifier system and television set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200953214U CN201248028Y (en) | 2008-07-04 | 2008-07-04 | Triggering circuit, audio power amplifier system and television set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201248028Y true CN201248028Y (en) | 2009-05-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200953214U Expired - Lifetime CN201248028Y (en) | 2008-07-04 | 2008-07-04 | Triggering circuit, audio power amplifier system and television set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201248028Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110323941A (en) * | 2018-03-30 | 2019-10-11 | 南宁富桂精密工业有限公司 | Low-power consumption standby circuit |
| CN112153532A (en) * | 2020-09-27 | 2020-12-29 | 上海博泰悦臻网络技术服务有限公司 | Vehicle, vehicle machine with vehicle machine, vehicle machine circuit adaptive to external power amplifier and control method |
-
2008
- 2008-07-04 CN CNU2008200953214U patent/CN201248028Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110323941A (en) * | 2018-03-30 | 2019-10-11 | 南宁富桂精密工业有限公司 | Low-power consumption standby circuit |
| CN112153532A (en) * | 2020-09-27 | 2020-12-29 | 上海博泰悦臻网络技术服务有限公司 | Vehicle, vehicle machine with vehicle machine, vehicle machine circuit adaptive to external power amplifier and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090527 |