CN206807739U - Mute control circuit for power failure - Google Patents
Mute control circuit for power failure Download PDFInfo
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- CN206807739U CN206807739U CN201720618911.XU CN201720618911U CN206807739U CN 206807739 U CN206807739 U CN 206807739U CN 201720618911 U CN201720618911 U CN 201720618911U CN 206807739 U CN206807739 U CN 206807739U
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Abstract
It the utility model is related to the Jing Yin control technology of power down.It is complicated that the utility model solves conventional power down muting control circuit, component type, quantity compare more, occupy larger printing plate suqare, the problem of also increasing more extra cost, a kind of mute control circuit for power failure is proposed, its technical scheme can be summarized as：Including power power supply and ground wire, it is characterized in that, first resistor and second resistance, one end of the first resistor is connected with power power supply, the other end is connected by second resistance with ground wire, and the common port of first resistor and second resistance is used to be connected with the Jing Yin or Opportunity awaiting control for linear port of power amplification circuit.The beneficial effects of the utility model are, both can effectively solve the problems, such as AC dump moment because uncontrolled and so that loudspeaker sends abnormal sound, component number can be greatly reduced again, printed board space is saved and reduce system cost, suitable for the electronic equipment with audio enlarging function.
Description
Technical field
Audio amplifier circuit technology is the utility model is related to, the Jing Yin control of power down for more particularly to possessing audio enlarging function
The technology of circuit.
Background technology
It is related to currently in audio or audio frequency and video electronic product, generally a sound carrier power amplification circuit is present,
For the audio signal of input to be carried out into power amplification, loudspeaker sounding is finally sent to.
When above-mentioned sound carrier power amplifying circuit is in course of normal operation, because some reasons cause the power supply of system to be closed
Close, now each part of circuit system will taper off work because of falling under power supply, and power amplification circuit will also enter
Enter uncontrolled state, and amplify and export some uncontrolled signals and sent by loudspeaker than more serious power down noise.
In order to solve this problem, it will usually a special mute control circuit for power failure is configured, to detect power supply shape
State, and when detecting that power-down conditions occur sending control signal to the Jing Yin or Opportunity awaiting control for linear end of power amplification circuit
Mouthful, allow power amplifier integrated circuit to close output or into holding state, avoid the occurrence of undesirable noise.Above-mentioned is special
Mute control circuit for power failure, traditional circuit structure such as accompanying drawing 1, comprising about 10 discrete components, specifically include：The R1 of resistance one,
The R2 of resistance two, the R3 of resistance three, the R4 of resistance four, the R5 of resistance five, the R6 of resistance six, the C1 of electric capacity one, the C2 of electric capacity two, the D1 of diode one, three
The Q1 of the pole pipe one and Q2 of triode two, wherein, the R1 of resistance one one end is connected with power supply Vamp, the other end respectively with resistance two
R2 one end is connected with the R3 of resistance three one end, and the R2 of resistance two other end is connected with the D1 of diode one anode, diode one
D1 negative electrode is connected by the R4 of resistance four with ground wire, and the R3 of resistance three other end is connected with the Q1 of triode one base stage, triode
One Q1 emitter stage is connected with the D1 of diode one negative electrode, and the C1 of electric capacity one positive pole is connected with triode Q1 emitter stage, negative pole
It is connected with ground wire, the Q1 of triode one colelctor electrode is connected by the R5 of resistance five with the Q2 of triode two base stage, the Q2's of triode two
Emitter stage is connected with ground wire, and emitter stage is connected by the Jing Yin or Opportunity awaiting control for linear port of the C2 of electric capacity two and power amplification circuit
Connect, the R6 of resistance six one end is connected with the Q2 of triode two colelctor electrode, and the other end is connected with power supply Vamp, the C2's of electric capacity two
One end is connected with the Q2 of triode two colelctor electrode, and the other end is connected with ground wire.When power supply normal power supply, power supply Vamp leads to
Cross the R1 of resistance one, the R2 of resistance two, the D1 of diode one to charge to the C1 of electric capacity one, after the C1 voltages of electric capacity one reach some value of setting
In stable state, now the Q1 of triode one, the Q2 of triode two are in cut-off state, the Q2 of the triode two high electricity of colelctor electrode submitting
The Jing Yin or Opportunity awaiting control for linear port of power amplification circuit is put down, power amplification circuit is in normal operating conditions.
After power supply power-fail, power supply Vamp can not stablize and fall under starting, when dropping to some setting magnitude of voltage instantly, triode one
Q1 is turned on, and drives the Q2 of triode two to turn on, and now the Q2 of triode two colelctor electrode sends out low level to the integrated electricity of power amplification
The Jing Yin or Opportunity awaiting control for linear port on road, power amplification circuit are in Jing Yin/holding state, so as to realize the Jing Yin work(of power down
Energy.The conventional power down muting control circuit reliable operation, can effectively solve the problems, such as the power amplifier output noise that power down triggers, still
The slightly aobvious complexity of circuit, component type, quantity compare more, occupy larger printing plate suqare, also increase more extra
Cost.
Utility model content
The purpose of this utility model is to propose a kind of mute control circuit for power failure, solves conventional power down muting control circuit knot
Structure is complicated, and component type, quantity are relatively more, occupy larger printing plate suqare, also increase more extra cost
Problem.
The utility model solves its technical problem, and the technical scheme of use is：Mute control circuit for power failure, including power supply electricity
Source and ground wire, it is characterised in that first resistor and second resistance, one end of the first resistor is connected with power supply, another
End is connected by second resistance with ground wire, and the common port of first resistor and second resistance is for quiet with power amplification circuit
Sound or the connection of Opportunity awaiting control for linear port.
Preferably, the operating voltage of the power supply is 12V.
Preferably, the resistance of the first resistor is 100 kilo-ohms, and the resistance of second resistance is 24 kilo-ohms.
The beneficial effects of the utility model are, electric when power supply is in power down by above-mentioned mute control circuit for power failure
When pressure is dropped to below Jing Yin or Opportunity awaiting control for linear port the control level threshold of power amplification circuit, trigger power amplifier fast
Speed enters Jing Yin or holding state, and guarantee ensures not sending unnecessary noise during power down.
Brief description of the drawings
Fig. 1 is the circuit structure diagram of conventional power down muting control circuit.
Fig. 2 is the circuit structure diagram of the utility model mute control circuit for power failure.
Wherein, R1 is resistance one, and R2 is resistance two, and R3 is resistance three, and R4 is resistance four, and R5 is resistance five, and R6 is resistance
Six, D1 are diode one, and C1 is electric capacity one, and C2 is electric capacity two, and Q1 is triode one, and Q2 is triode two, and RA1 is the first electricity
Resistance, RA2 are second resistance, and Vamp is power supply, and Va is the Jing Yin or Opportunity awaiting control for linear port of power amplification circuit
Control level threshold.
Embodiment
Below in conjunction with the accompanying drawings and embodiment, the technical solution of the utility model is described in detail.
Mute control circuit for power failure described in the utility model is by power supply Vamp, ground wire, the electricity of first resistor RA1 and second
Hinder RA2 composition, its circuit structure diagram referring to Fig. 2, wherein, first resistor RA1 one end is connected with power supply Vamp, the other end
It is connected by second resistance RA2 with ground wire, first resistor RA1 and second resistance RA2 common port is used to integrate with power amplification
The Jing Yin or Opportunity awaiting control for linear port connection of circuit.Here, when power supply Vamp is in power down, RA2 points of second resistance
When Jing Yin or Opportunity awaiting control for linear port below the control level threshold Va of power amplification circuit is dropped under voltage, trigger work(
Rate amplification circuit rapidly enters Jing Yin or holding state, when power supply Vamp is in power down, RA2 points of second resistance
Magnitude of voltage be more than or equal to power amplification circuit Jing Yin or Opportunity awaiting control for linear port control level threshold Va when, work(
Rate amplification circuit is in normal operating conditions.
Embodiment
The utility model embodiment mute control circuit for power failure includes power supply Vamp, ground wire, first resistor RA1 and the
Two resistance RA2, wherein, first resistor RA1 one end is connected with power supply Vamp, and the other end passes through second resistance RA2 and ground
Line connects, and first resistor RA1 and second resistance RA2 common port is used for the Jing Yin or standby control with power amplification circuit
Port connection processed.
In foregoing circuit, the operating voltage of power supply is 12V；The resistance of first resistor is 100 kilo-ohms, second resistance
Resistance is 24 kilo-ohms.
In this example, to control level threshold Va be 2V for power amplification circuit Jing Yin or Opportunity awaiting control for linear port.
In practical application, when power supply Vamp is operating voltage not power down, the voltage that second resistance RA2 divides is
2.3V, more than Jing Yin or Opportunity awaiting control for linear port the control level threshold Va of power amplification circuit 2V, power amplification
Integrated circuit is in normal operating conditions；When power supply Vamp is in power down, second resistance RA2 points magnitude of voltage be more than or
Equal to power amplification circuit Jing Yin or Opportunity awaiting control for linear port control level threshold Va when, i.e. power supply Vamp exists
Under when dropping to 10.3V and more than 10.3V, power amplification circuit is in normal operating conditions；When power supply Vamp is falling
When electric, Jing Yin or Opportunity awaiting control for linear port the control of power amplification circuit is dropped under the voltage that second resistance RA2 divides
During below level threshold Va, i.e., when power supply Vamp drops to below 10.3V under, power amplification circuit is triggered quickly to enter
Enter Jing Yin or holding state.
Claims (3)
1. mute control circuit for power failure, including power supply and ground wire, it is characterised in that first resistor and second resistance, it is described
One end of first resistor is connected with power supply, and the other end is connected by second resistance with ground wire, first resistor and second resistance
Common port be used for be connected with the Jing Yin or Opportunity awaiting control for linear port of power amplification circuit.
2. it is described mute control circuit for power failure according to claim 1, it is characterised in that the operating voltage of the power supply
For 12V.
3. it is described mute control circuit for power failure according to claim 1, it is characterised in that the resistance of the first resistor is
100 kilo-ohms, the resistance of second resistance is 24 kilo-ohms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720618911.XU CN206807739U (en) | 2017-05-31 | 2017-05-31 | Mute control circuit for power failure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720618911.XU CN206807739U (en) | 2017-05-31 | 2017-05-31 | Mute control circuit for power failure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206807739U true CN206807739U (en) | 2017-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720618911.XU Active CN206807739U (en) | 2017-05-31 | 2017-05-31 | Mute control circuit for power failure |
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| Country | Link |
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| CN (1) | CN206807739U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110769353A (en) * | 2018-12-04 | 2020-02-07 | 北京嘀嘀无限科技发展有限公司 | Signal processing method, signal processing device, electronic equipment and storage medium |
-
2017
- 2017-05-31 CN CN201720618911.XU patent/CN206807739U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110769353A (en) * | 2018-12-04 | 2020-02-07 | 北京嘀嘀无限科技发展有限公司 | Signal processing method, signal processing device, electronic equipment and storage medium |
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