CN204929216U - A quick charging and discharging circuit for control of power amplifier silence - Google Patents
A quick charging and discharging circuit for control of power amplifier silence Download PDFInfo
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- CN204929216U CN204929216U CN201520750213.6U CN201520750213U CN204929216U CN 204929216 U CN204929216 U CN 204929216U CN 201520750213 U CN201520750213 U CN 201520750213U CN 204929216 U CN204929216 U CN 204929216U
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Abstract
The utility model discloses a quick charging and discharging circuit for the control of power amplifier silence, including quick charging and discharging circuit, power amplifier IC, audio input circuit, audio output circuit and standby control circuit, power amplifier IC's MUTE pin passes through the connecting wire and links to each other with quick charging and discharging circuit, and power amplifier IC's standby pin passes through the connecting wire and links to each other with standby control circuit, and power amplifier IC's input links to each other with the audio input circuit, and power amplifier IC's output links to each other with the audio output circuit. When standby control circuit's input was the high level, the state was enlargied at normal power to the work of power amplifier IC, and when standby control circuit's input was the low level, power amplifier IC worked at standby state, the audio output circuit is direct to link to each other with loudspeaker, when the signal input of MCU_MUTE signal was the high level, quick charging and discharging circuit constituteed the repid discharge return circuit, and when the signal input of MCU_MUTE signal was the low level, quick charging and discharging circuit constituteed quick charging circuit.
Description
Technical field
The utility model relates to the technical field of multimedia power amplifier, particularly relates to a kind of quick fast charging and discharging circuit for the quiet control of power amplifier.
Background technology
In in-vehicle multi-media system, designer often adopts AB class power discharging IC to amplify audio frequency small-signal to promote loudspeaker, to play out sound.And concerning designer, jump bent in preventing from playing, occur during time-outs action of etc.ing that user does not want that the distorsion heard is the function of indispensability, thus, to power discharging IC to carry out correct quiet (MUTE) control be also necessary.
Theoretical research shows, signal of telecommunication is wanted to promote loudspeaker and sent the sound that people's ear can hear, two conditions below demand fulfillment:
1. signal amplitude is enough high, and loudspeaker can be made to produce vibration.Actual experiment found that, highly sensitive loudspeaker amplitude reaches 50mV just can promote loudspeaker;
2. the frequency range that can hear at people's ear of signal frequency.Research shows, the frequency range that people's ear can be listened is at 20Hz ~ 20kHz.
Above two conditions have any one to be false, and people's ear just can't hear corresponding sound.
And in power amplifier, we can not adopt the way reducing biasing voltage signal amplitude to carry out stress release treatment, also reduce the normal sound exported so equally.
Utility model content
For the weak point existed in above-mentioned technology, the quick fast charging and discharging circuit for the quiet control of power amplifier that the utility model provides a kind of structure simple, easy to operate.
In order to achieve the above object, a kind of quick fast charging and discharging circuit for the quiet control of power amplifier of the utility model, comprise fast charging and discharging circuit, power discharging IC, audio input circuit, audio output circuit and readiness control circuit, the MUTE pin of described power discharging IC is connected with fast charging and discharging circuit by connecting line, the standby pin of described power discharging IC is connected with readiness control circuit by connecting line, the input of described power discharging IC is connected with audio input circuit, and the output of power discharging IC is connected with audio output circuit.
Wherein, described fast charging and discharging circuit comprises triode, electrochemical capacitor and the first resistance, the base stage of described triode is connected with MCU_MUTE signal, the collector electrode of described triode is connected with power supply, the grounded emitter of described triode, described one end of first resistance is connected with the collector electrode of triode, and the other end of the first resistance is connected with the MUTE pin of power discharging IC, one end of described electrochemical capacitor is arranged on the junction of the first resistance and power discharging IC, and the other end ground connection of electrochemical capacitor.
Wherein, described fast charging and discharging circuit also comprises the second resistance and the 3rd resistance, described second resistance one end is connected with the base stage of triode, and the other end of the second resistance is connected with MCU_MUTE signal, one end of described 3rd resistance is connected with the collector electrode of triode, and the other end of the 3rd resistance is connected with power supply.
Wherein, described readiness control circuit comprises the first electric capacity, second electric capacity, 4th resistance, 5th resistance and the 6th resistance, described first electric capacity one end ground connection, and the first electric capacity other end is connected with the 4th resistance, described 4th resistance one end is connected with the first electric capacity and power supply respectively, and the other end of the 4th resistance is connected with the 5th resistance and the 6th resistance respectively, one end of described 5th resistance is connected with the 4th resistance and the 5th resistance respectively, and the other end of the 5th resistance is connected with the standby pin of the second electric capacity and power discharging IC respectively, one end of described 6th resistance is connected with the 4th resistance, and the other end ground connection of the 6th resistance, one end of described second electric capacity is connected with the 5th resistance, and the other end ground connection of the second electric capacity.
Wherein, described audio input circuit comprises multiple capacitance, and each capacitance one end and audio frequency input IO and be connected, and the other end of each capacitance is connected with the audio frequency input pin of power discharging IC.
The beneficial effects of the utility model are:
Compared with prior art, the quick fast charging and discharging circuit for the quiet control of power amplifier of the present utility model, the DC level that audio input circuit is placed in input power discharging IC is exaggerated; When readiness control circuit be input as high level time, power discharging IC is operated in normal power magnifying state, when readiness control circuit be input as low level time, power discharging IC is operated in holding state; Audio output circuit is directly connected with loudspeaker; When the signal of MCU_MUTE signal is input as high level, fast charging and discharging circuit composition repid discharge loop, when the signal of MCU_MUTE signal is input as low level, fast charging and discharging circuit composition quick-charging circuit.The utility model adopts a fast charging and discharging circuit to control the MUTE signal of power discharging IC, the time of the output offset change in voltage of adjustment as MUTEON/OFF, thus change the frequency of output offset voltage, allow this frequency outside people's ear audible frequency range, reach the effect eliminated and export distorsion.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the utility model for the quick fast charging and discharging circuit of the quiet control of power amplifier.
Main element symbol description is as follows:
1, fast charging and discharging circuit 2, readiness control circuit
3, audio input circuit 4, power discharging IC
5, audio output circuit.
Embodiment
In order to more clearly state the utility model, below in conjunction with accompanying drawing, the utility model is further described.
Consult Fig. 1, a kind of quick fast charging and discharging circuit 1 for the quiet control of power amplifier of the utility model, comprise fast charging and discharging circuit 1, power discharging IC 4, audio input circuit 3, audio output circuit 5 and readiness control circuit 2, the MUTE pin of power discharging IC 4 is connected with fast charging and discharging circuit 1 by connecting line, the standby pin ST-BY of power discharging IC 4 is connected with readiness control circuit 2 by connecting line, the input of power discharging IC 4 is connected with audio input circuit 3, and the loudspeaker SPK1 that the output of power discharging IC 4 is connected in audio output circuit with audio output circuit 5, SPK2 and SPK3 audio plays.
Compared to prior art, the quick fast charging and discharging circuit 1 for the quiet control of power amplifier of the present utility model, the DC level that audio input circuit 3 is placed in input power amplifier IC4 is exaggerated; When readiness control circuit 2 be input as high level time, power discharging IC 4 is operated in normal power magnifying state, when readiness control circuit 2 be input as low level time, power discharging IC 4 is operated in holding state; Audio output circuit 5 is directly connected with loudspeaker; When the signal of MCU_MUTE signal is input as high level, fast charging and discharging circuit 1 forms repid discharge loop, and when the signal of MCU_MUTE signal is input as low level, fast charging and discharging circuit 1 forms quick-charging circuit.The utility model adopts a fast charging and discharging circuit 1 to control the MUTE signal of power discharging IC 4, the time of the output offset change in voltage of adjustment as MUTEON/OFF, thus change the frequency of output offset voltage, allow this frequency outside people's ear audible frequency range, reach the effect eliminated and export distorsion.
In the present embodiment, fast charging and discharging circuit 1 comprises triode Q1, electrochemical capacitor EC1 and the first resistance R1, the base stage of triode Q1 is connected with MCU_MUTE signal, the collector electrode of triode Q1 is connected with power supply VCC, the grounded emitter of triode Q1, one end of first resistance R1 is connected with the collector electrode of triode Q1, and the other end of the first resistance R1 is connected with the MUTE pin of power discharging IC 4, one end of electrochemical capacitor EC1 is arranged on the junction of the first resistance R1 and power discharging IC 4, and the other end ground connection of electrochemical capacitor EC1.Fast charging and discharging circuit 1 also comprises the second resistance R2 and the 3rd resistance R3, second resistance R2 one end is connected with the base stage of triode Q1, and the other end of the second resistance R2 is connected with MCU_MUTE signal, one end of 3rd resistance R3 is connected with the collector electrode of triode Q1, and the other end of the 3rd resistance R3 is connected with power supply VCC.
MUTEON: when MCU_MUTE signal is high level, triode Q1 saturation conduction, constitutes repid discharge loop between electrochemical capacitor EC1, the first electric capacity C1 and triode Q1, makes the current potential of electrochemical capacitor EC1 drop to zero rapidly.Power supply VCC is also connected to ground by the 3rd resistance R3 simultaneously.So the type selecting of triode Q1 must meet following key condition: ICE (SAT) > (VCC-VCE (SAT))/R2.During MUTEON, the change frequency of output offset voltage is greater than 20khz, is in outside people's ear audible frequency range.
MUTEOFF: when MCU_MUTE signal is low level, triode Q1 is in by state, power supply VCC, the first resistance R1, the 3rd resistance R3 and electrochemical capacitor EC1 constitute the quick-charging circuit to electrochemical capacitor EC1, and the voltage of electrochemical capacitor EC1 can be climbed to VCC.The value of the second resistance R2 can adjust, enough fast to meet the charging interval.During MUTEOFF, the change frequency of output offset voltage is greater than 20khz, is in outside people's ear audible frequency range.
In the present embodiment, readiness control circuit 2 comprises the first electric capacity C1, second electric capacity C2, 4th resistance R4, 5th resistance R5 and the 6th resistance R6, first electric capacity C1 one end ground connection, and the first electric capacity C1 other end is connected with the 4th resistance R4, 4th resistance R4 one end is connected with the first electric capacity C1 and power supply VCC respectively, and the other end of the 4th resistance R4 is connected with the 5th resistance R5 and the 6th resistance R6 respectively, one end of 5th resistance R5 is connected with the 4th resistance R4 and the 5th resistance R5 respectively, and the other end of the 5th resistance R5 is connected with the standby pin ST-BY of the second electric capacity C2 and power discharging IC 4 respectively, one end of 6th resistance R6 is connected with the 4th resistance R4, and the other end ground connection of the 6th resistance R6, one end of second electric capacity C2 is connected with the 5th resistance R5, and the other end ground connection of the second electric capacity C2.
In the present embodiment, audio input circuit 3 comprises capacitance C3, C4 and C5, and each capacitance one end is connected with audio input signal FRONT_R, and the other end of each capacitance is connected with the audio frequency input pin of power discharging IC 4.Input is amplified in the inside that audio signal enters into power discharging IC 4 through isolation capacitance, prevents DC level to be exaggerated.
Be only several specific embodiment of the present utility model above, but the utility model is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection range of the present utility model.
Claims (5)
1. the quick fast charging and discharging circuit for the quiet control of power amplifier, it is characterized in that, comprise fast charging and discharging circuit, power discharging IC, audio input circuit, audio output circuit and readiness control circuit, the MUTE pin of described power discharging IC is connected with fast charging and discharging circuit by connecting line, the standby pin of described power discharging IC is connected with readiness control circuit by connecting line, the input of described power discharging IC is connected with audio input circuit, and the output of power discharging IC is connected with audio output circuit.
2. the quick fast charging and discharging circuit for the quiet control of power amplifier according to claim 1, it is characterized in that, described fast charging and discharging circuit comprises triode, electrochemical capacitor and the first resistance, the base stage of described triode is connected with MCU_MUTE signal, the collector electrode of described triode is connected with power supply, the grounded emitter of described triode, described one end of first resistance is connected with the collector electrode of triode, and the other end of the first resistance is connected with the MUTE pin of power discharging IC, one end of described electrochemical capacitor is arranged on the junction of the first resistance and power discharging IC, and the other end ground connection of electrochemical capacitor.
3. the quick fast charging and discharging circuit for the quiet control of power amplifier according to claim 2, it is characterized in that, described fast charging and discharging circuit also comprises the second resistance and the 3rd resistance, described second resistance one end is connected with the base stage of triode, and the other end of the second resistance is connected with MCU_MUTE signal, one end of described 3rd resistance is connected with the collector electrode of triode, and the other end of the 3rd resistance is connected with power supply.
4. the quick fast charging and discharging circuit for the quiet control of power amplifier according to claim 1, it is characterized in that, described readiness control circuit comprises the first electric capacity, second electric capacity, 4th resistance, 5th resistance and the 6th resistance, described first electric capacity one end ground connection, and the first electric capacity other end is connected with the 4th resistance, described 4th resistance one end is connected with the first electric capacity and power supply respectively, and the other end of the 4th resistance is connected with the 5th resistance and the 6th resistance respectively, one end of described 5th resistance is connected with the 4th resistance and the 5th resistance respectively, and the other end of the 5th resistance is connected with the standby pin of the second electric capacity and power discharging IC respectively, one end of described 6th resistance is connected with the 4th resistance, and the other end ground connection of the 6th resistance, one end of described second electric capacity is connected with the 5th resistance, and the other end ground connection of the second electric capacity.
5. the quick fast charging and discharging circuit for the quiet control of power amplifier according to claim 1, it is characterized in that, described audio input circuit comprises multiple capacitance, each capacitance one end and audio frequency input IO and are connected, and the other end of each capacitance is connected with the audio frequency input pin of power discharging IC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520750213.6U CN204929216U (en) | 2015-09-25 | 2015-09-25 | A quick charging and discharging circuit for control of power amplifier silence |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520750213.6U CN204929216U (en) | 2015-09-25 | 2015-09-25 | A quick charging and discharging circuit for control of power amplifier silence |
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| Publication Number | Publication Date |
|---|---|
| CN204929216U true CN204929216U (en) | 2015-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520750213.6U Expired - Fee Related CN204929216U (en) | 2015-09-25 | 2015-09-25 | A quick charging and discharging circuit for control of power amplifier silence |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109922394A (en) * | 2017-12-13 | 2019-06-21 | 华为终端有限公司 | Bias voltage output circuit and driving circuit |
-
2015
- 2015-09-25 CN CN201520750213.6U patent/CN204929216U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109922394A (en) * | 2017-12-13 | 2019-06-21 | 华为终端有限公司 | Bias voltage output circuit and driving circuit |
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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: 20151230 Termination date: 20180925 |
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| CF01 | Termination of patent right due to non-payment of annual fee |