CN201001105Y - Circuit for eliminating impact sound of shut-down - Google Patents
Circuit for eliminating impact sound of shut-down Download PDFInfo
- Publication number
- CN201001105Y CN201001105Y CNU2007201180543U CN200720118054U CN201001105Y CN 201001105 Y CN201001105 Y CN 201001105Y CN U2007201180543 U CNU2007201180543 U CN U2007201180543U CN 200720118054 U CN200720118054 U CN 200720118054U CN 201001105 Y CN201001105 Y CN 201001105Y
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- circuit
- triode
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- shutdown
- eliminating
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Abstract
The utility model discloses a circuit for eliminating the power-off impulsive sound, comprises a power Vcc, a switch tube Q1 connected with the power Vcc, and a triode Q2 connected with a power amplifier IC control pin. The switch tube Q1 is a PNP type triode, an emitting electrode is connected with the power Vcc through a diode D1, a base electrode is connected with a resistance R2 used for setting the direct current voltage of the switch tube Q1, and a capacitance C1 is connected in parallel at both ends of the resistance R2; through a simple circuit design, the mute pin or the control pin of the sound power amplifier IC discharges fully and quickly for the power-off or power-failure instant, thereby the production of the impulsive sound for the power-off or power-failure instant is eliminated.
Description
[technical field]
The utility model relates to the consumer products technical field, particularly a kind of circuit of eliminating the shutdown impulsive sound.
[background technology]
In television set, DVD and acoustic product field, the moment when shutdown or outage, impulsive sound appears easily; This is because shutdown or outage moment, and the quiet pin of sound power discharging IC or control pin can not be fully, repid discharge causes.Though this kind phenomenon is to the not too big harm of normal use of product, do not influence the normal use of product yet, but impulsive sound is comparatively obvious during owing to each shutdown or outage, influence consumer's mood easily, disturb consumer's mood, the consumer is thrown doubt upon to the product total quality unavoidably.So be necessary to provide a kind of circuit, make shutdown or outage moment, the quiet pin of sound power discharging IC or control pin fully, repid discharge, thereby eliminate this shutdown or outage moment produces impulsive sound.
[novel content]
For addressing the above problem, main purpose of the present utility model is to provide a kind of circuit of eliminating the shutdown impulsive sound, make shutdown or outage moment, the quiet pin of sound power discharging IC or control pin fully, repid discharge, thereby eliminate this shutdown or outage moment produces impulsive sound.
For achieving the above object, the technical scheme of this creation is: a kind of circuit of eliminating the shutdown impulsive sound includes power Vcc, it is characterized in that: also include switching tube Q1 that is connected with power Vcc and the triode Q2 that connects the power discharging IC control pin.
Further, described switching tube Q1 is the positive-negative-positive triode, and its emitter is connected with power Vcc by a diode D1.
Further, the base stage of described switching tube Q1 is connected with the resistance R 2 that is used to be provided with switching tube Q1 direct voltage, and resistance R 2 two ends are parallel with capacitor C 1.
Further, also be provided with the voltage-stabiliser tube ZD1 that connects resistance R 2 and capacitor C 1 parallel circuits, to keep the direct voltage of switching tube Q1 ground level; And be connected in parallel on voltage-stabiliser tube ZD1 two ends, with the capacitor C 2 of improving High-frequency Interference.
Further, be connected with diode D2 and resistance R 3 between the collector electrode of described switching tube Q1 and the triode Q2; Described triode Q2 is a NPN type triode, and its collector electrode is connected with the control pin of power discharging IC, and grounded emitter.
Further, described switching tube Q1 also is connected with triode Q3, Q4 by a diode D3; The grounded emitter of described triode Q3, Q4, and collector electrode connects the left and right sides sound channel of power amplifier respectively.
Compared to prior art, a kind of circuit of shutdown impulsive sound of eliminating of the utility model is by simple circuit design, make shutdown or outage moment, the quiet pin of sound power discharging IC or control pin fully, repid discharge, thereby eliminate this shutdown or outage moment produces impulsive sound.
[description of drawings]
Fig. 1 eliminates the schematic diagram of the circuit of shutdown impulsive sound for the utility model is a kind of;
Fig. 2 for the utility model when the power discharging IC control pin be the circuit theory diagrams of low level when playing sound deadening;
Fig. 3 is the circuit theory diagrams of another embodiment of the utility model.
[embodiment]
Please refer to shown in Figure 1ly, the utility model is a kind of eliminates the circuit of shutdown impulsive sound, comprising: power Vcc, switching tube Q1, the triode Q2 that connects the power discharging IC control pin and triode Q3, the Q4 that is connected to power discharging IC left and right sides sound channel respectively.
Diode D2 and D3 are optionally, and the left and right sides sound channel of control power discharging IC mode pin or control power discharging IC is consistent substantially on effect, add simultaneously certainly also to make control can determine according to practical effect more fully a bit.
Described switching tube Q1 is the positive-negative-positive triode, is serially connected with diode D1 between its emitter and the power Vcc, and base stage is connected with the resistance R 2 that is used to be provided with switching tube Q1 direct voltage, and resistance R 2 two ends are parallel with capacitor C 1; Simultaneously, in order to keep the direct voltage of switching tube Q1 ground level, also be provided with the voltage-stabiliser tube ZD1 that connects resistance R 2 and capacitor C 1 parallel circuits, and be connected in parallel on voltage-stabiliser tube ZD1 two ends, with the capacitor C 2 of improving High-frequency Interference.Wherein, the negative pole of described capacitor C 1 connects the base stage of switching tube Q1, and positive pole is connected to base stage and keeps the direct voltage place.Be connected with diode D2 and resistance R 3 between the collector electrode of switching tube Q1 and the triode Q2; And triode Q3, Q4 are connected to the negative pole of a diode D3 respectively by resistance R 4, R5, then link to each other with the collector electrode of switching tube Q1 by this diode D3.In this creation, triode Q2 is a NPN type triode, and its collector electrode is connected with the control pin of power discharging IC, and grounded emitter.
During normal operating conditions, the A node voltage is kept by voltage-stabiliser tube ZD1, select the voltage-stabiliser tube of 7.5V in this creation for use, behind diode D1, the voltage of B node is the pressure drop that the voltage of A node deducts diode D1, and the pressure drop of general D1 is about 0.7V, and the voltage of C node is to equate with the A node voltage, this moment, Vbe was similar to about 0.7V, and switching tube Q1 is in by state.Diode D2, D3 also are in by state at this moment, and the control that does not influence power discharging IC under the normal operating conditions is used.
Outage moment, A, C node voltage make zero, because the keeping of capacitor C 3, the voltage of this moment keeps voltage in normal operation to diode D1, is VZD1 by, B node voltage; This moment the Vbe of switching tube Q1 be approximately-(VZD1-0.7V), Q1 is in running order, and Vec is about 0.3V, diode D2, D3 are in conducting, triode Q2 is in running order, and then the control pin of control power discharging IC or the input port of sound, realizes eliminating the outage impulsive sound of moment
Certainly when eliminating impulsive sound, will notice that also different power discharging IC control pins are that high level or low level play sound deadening, be the situation that low level works in the present embodiment, if high level, as shown in Figure 2, only the conducting of diode D2 gets final product.In addition, when row's plate, the position of diode D2, D3 can be reserved simultaneously, and the control of diode D3 back is that the sound that enters the power discharging IC processing is masked, and effect also is the same.
Figure 3 shows that this creates another embodiment, wherein the voltage of switching tube Q1 base stage is directly provided by Vcc.
Most preferred embodiment described above only is that the utility model is set forth and illustrated, but is not limited to disclosed any concrete form, and it is possible carrying out many modifications and variations.
Claims (8)
1. a circuit of eliminating the shutdown impulsive sound includes power Vcc, it is characterized in that: also include switching tube Q1 that is connected with power Vcc and the triode Q2 that connects the power discharging IC control pin.
2. a kind of circuit of eliminating the shutdown impulsive sound as claimed in claim 1, it is characterized in that: described switching tube Q1 is the positive-negative-positive triode, its emitter is connected with power Vcc by a diode D1.
3. a kind of circuit of eliminating the shutdown impulsive sound as claimed in claim 1, it is characterized in that: described switching tube Q1 is the positive-negative-positive triode, and its base stage is connected with the resistance R 2 that is used to be provided with switching tube Q1 direct voltage, and resistance R 2 two ends are parallel with capacitor C 1.
4. a kind of circuit of eliminating the shutdown impulsive sound as claimed in claim 3 is characterized in that: also be provided with the voltage-stabiliser tube ZD1 that connects resistance R 2 and capacitor C 1 parallel circuits, to keep the direct voltage of switching tube Q1 ground level; And be connected in parallel on voltage-stabiliser tube ZD1 two ends, with the capacitor C 2 of improving High-frequency Interference.
5. as each described a kind of circuit of eliminating the shutdown impulsive sound of claim 1 to 4, it is characterized in that: be connected with diode D2 and resistance R 3 between the collector electrode of described switching tube Q1 and the triode Q2.
6. as each described a kind of circuit of eliminating the shutdown impulsive sound of claim 1 to 4, it is characterized in that: described triode Q2 is a NPN type triode, and its collector electrode is connected with the control pin of power discharging IC, and grounded emitter.
7. a kind of circuit of eliminating the shutdown impulsive sound as claimed in claim 6, it is characterized in that: described switching tube Q1 also is connected with triode Q3, Q4 by a diode D3.
8. a kind of circuit of eliminating the shutdown impulsive sound as claimed in claim 7 is characterized in that: the grounded emitter of described triode Q3, Q4, and collector electrode connects the left and right sides sound channel of power amplifier respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201180543U CN201001105Y (en) | 2007-01-12 | 2007-01-12 | Circuit for eliminating impact sound of shut-down |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201180543U CN201001105Y (en) | 2007-01-12 | 2007-01-12 | Circuit for eliminating impact sound of shut-down |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201001105Y true CN201001105Y (en) | 2008-01-02 |
Family
ID=39015506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201180543U Expired - Fee Related CN201001105Y (en) | 2007-01-12 | 2007-01-12 | Circuit for eliminating impact sound of shut-down |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201001105Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707477A (en) * | 2009-10-23 | 2010-05-12 | 深圳创维－Rgb电子有限公司 | Circuit for eliminating impact sound generated in switching process |
| CN102325288A (en) * | 2011-09-02 | 2012-01-18 | 惠州Tcl移动通信有限公司 | De-noising device and method for audio circuit of mobile terminal earphone |
-
2007
- 2007-01-12 CN CNU2007201180543U patent/CN201001105Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707477A (en) * | 2009-10-23 | 2010-05-12 | 深圳创维－Rgb电子有限公司 | Circuit for eliminating impact sound generated in switching process |
| CN101707477B (en) * | 2009-10-23 | 2013-09-25 | 深圳创维－Rgb电子有限公司 | Circuit for eliminating impact sound generated in switching process |
| CN102325288A (en) * | 2011-09-02 | 2012-01-18 | 惠州Tcl移动通信有限公司 | De-noising device and method for audio circuit of mobile terminal earphone |
| CN102325288B (en) * | 2011-09-02 | 2014-04-16 | 惠州Tcl移动通信有限公司 | De-noising device and method for audio circuit of mobile terminal earphone |
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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: 20080102 Termination date: 20150112 |
|
| EXPY | Termination of patent right or utility model |