CN203166841U - Power supply processing circuit for audio power amplifier - Google Patents
Power supply processing circuit for audio power amplifier Download PDFInfo
- Publication number
- CN203166841U CN203166841U CN 201320138932 CN201320138932U CN203166841U CN 203166841 U CN203166841 U CN 203166841U CN 201320138932 CN201320138932 CN 201320138932 CN 201320138932 U CN201320138932 U CN 201320138932U CN 203166841 U CN203166841 U CN 203166841U
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- power amplifier
- audio
- capacitor
- resistance
- processing circuit
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Abstract
The utility model discloses a power supply processing circuit for an audio power amplifier. According to the power supply processing circuit for the audio power amplifier, a diode D4, a thermistor R10 and an inductor L1 are sequentially connected between a power input end and a positive power input pin of the audio power amplifier, and a common terminal of the diode D4 and a common terminal of the thermistor R10 are connected to the ground through a resistor R12 and a capacitor C10 which are in tandem connection. The positive power input pin of the audio power amplifier is connected to the ground through a resistor R9, and at least one filter capacitor is arranged to be in parallel connection with the resistor R9. A divider resistor R11 and a divider resistor R17 are in tandem connection between the common terminal of the thermistor R10 and a common terminal of the inductor L1 and the ground, a capacitor C15 and the divider resistor R17 are arranged to be in parallel connection, a common terminal of the divider resistor R11 and a common terminal of the divider resistor R17 are coupled with a base of a transistor Q3, an emitting electrode of the transistor Q3 is connected to the ground, and a collector electrode of the transistor Q3 is coupled with a common terminal of the resistor R12 and a common terminal of the capacitor C10. The power supply processing circuit for the audio power amplifier can effectively prevent impact sounds caused by sudden rising and falling of supply voltages in the startup and shutdown processes, the circuit structure is simple, and implementation cost is quite low.
Description
Technical field
The utility model relates to a kind of power circuit, especially relate to a kind of power supply is provided and has for audio-frequency power amplifier power on and the power supply processing circuit of power down process function.
Background technology
In existing television set, radio-cassette player, sound equipment etc. can the electric equipments of output audio signal, loud speaker output sonic boom when preventing its ac dump, usually within it in portion's circuit design the shutdown mute circuit is arranged.Conventional shutdown mute circuit generally adopts the R/C circuit, utilize the charge and discharge characteristic of electrochemical capacitor, allow audio power amplifier delay work when realizing start, allow audio power amplifier mute circuit maintenance work a period of time during shutdown, thereby avoid electric equipment loud speaker when ac dump to send abnormal voice, influence equipment complete machine quality.
The power supply processing circuit of audio-frequency power amplifier carries out slow liter of voltage to the power supply that offers audio-frequency power amplifier and slowly falls processing, prevents jumping or bust and the impulsive sound that occurs of when start or shutdown supply voltage.Yet, existing power supply processing circuit complex structure, realize that cost is higher.
The utility model content
For solving prior art problems, the utility model proposes the power supply processing circuit that a kind of circuit is simple, realize lower-cost audio-frequency power amplifier, and when start and shutdown, have preferable quiet effect.
The utility model adopts following technical scheme to realize: a kind of power supply processing circuit for audio-frequency power amplifier, it comprises: between the positive supply input pin of power input and audio-frequency power amplifier, be connected diode D4, thermistor R10 and inductance L 1 successively, and resistance R 12 and capacitor C 10 ground connection of common port by being connected in series of diode D4 and thermistor R10; The positive supply input pin of audio-frequency power amplifier is by resistance R 9 ground connection, and it is in parallel with resistance R 9 that at least one filter capacitor is set; Between the common port of resistance R 10 and inductance L 1 and ground, be connected in series two divider resistance R11 and R17, and it is in parallel with divider resistance R17 that capacitor C 15 is set, and the common port of two divider resistance R11 and R17 couples the base stage of transistor Q3, and this transistorized grounded emitter, collector electrode couple the common port of resistance R 12 and capacitor C 10.
Wherein, be connected capacitor C 8 between the anode of diode D4 and the ground.
Wherein, the base stage of transistor Q3 connects the anode of diode D5, and connects the common port of two divider resistance R11 and R17 behind the negative electrode series resistor R14 of diode D5.
Wherein, between the common port of resistance R 10 and inductance L 1 and ground, filter capacitor C4 is set.
Wherein, between the positive supply of audio-frequency power amplifier input pin and the ground at least one electrochemical capacitor is set, and the minus earth of this electrochemical capacitor.
Compared with prior art, the utlity model has following beneficial effect:
The power supply processing circuit that the utility model proposes can effectively prevent the impulsive sound that the bust that jumps of supply voltage occurs when switching on and shutting down, circuit structure is simple and realize that cost is lower.
Description of drawings
Fig. 1 is the circuit diagram of an embodiment of the utility model.
Embodiment
In conjunction with shown in Figure 1, the power supply processing circuit 10 that the utility model proposes is that the power supply that offers audio-frequency power amplifier U1 is carried out slow liter of voltage slowly falls processing, prevents the impulsive sound that the bust that jumps of supply voltage occurs when switching on and shutting down.
Specifically, this power supply processing circuit 10 comprises: the diode D4 that anode is connected with power input VCC, and its negative electrode connects the end of thermistor R10; The delay loop of being formed by thermistor R10, inductor L1, resistance R 9 and back load thereof; Resistance R 11, R12, R13, R14, R17, diode D5, transistor Q3 and capacitor C 10, C15, C4.
When power supply is connected in start, in the delay loop of being formed by thermistor R10 and inductor L1, resistance R 9 and back load thereof, because the characteristic of this thermistor R10 is negative temperature coefficient, temperature is more high, its resistance is more low, therefore, resistance R 9 and with resistance R 9 load in parallel (resistance R 9 can be with the load replacement of its back, not necessarily, also can play the effect of rapid discharge during power remove) dividing potential drop that go up to obtain is curved rising, selects suitable thermistor to make curve mild relatively; Meanwhile, capacitor C 15 is under the divider resistance effect of being made up of resistance R 11 and resistance R 17, and along with the voltage of resistance R 10 with inductor L1 common port rises and quick charge, the voltage at capacitor C 15 two ends progressively rises; When the both end voltage of capacitor C 15 rises to a certain degree, transistor Q3 conducting, resistance R 12 descends rapidly with the voltage of the common port of resistance R 13, and the voltage of thermistor R10 and inductor L1 common port rises to the supply voltage that approaches input thus rapidly, and settles out very soon.Thus, inductor L1 plays certain delayed action and anti-conducted interference effect in circuit.
When power supply power-fail, since resistance R 9 parallel connections several big filter capacitor C5, C6 and C7(wherein capacitor C 5 and C6 are electrochemical capacitor, its anodal positive supply input pin, minus earth that connects audio-frequency power amplifier U1), energy storage is bigger, during power cutoff because the existence of diode D4, these energy can't oppositely reflux greatly by diode D4 and release, and can only slowly release by bleed-off circuits such as resistance R 11, R17 and R9, avoid power supply to fall suddenly and cause the shutdown impulsive sound.
At this moment, the power supply of described audio-frequency power amplifier U1 is supplied with power up and is finished, and controls all mute circuits and stop quietly, and described audio-frequency power amplifier U1 just can operate as normal.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (5)
1. power supply processing circuit that is used for audio-frequency power amplifier, it is characterized in that, comprise: between the positive supply input pin of power input and audio-frequency power amplifier, be connected diode D4, thermistor R10 and inductance L 1 successively, and resistance R 12 and capacitor C 10 ground connection of common port by being connected in series of diode D4 and thermistor R10; The positive supply input pin of audio-frequency power amplifier is by resistance R 9 ground connection, and it is in parallel with resistance R 9 that at least one filter capacitor is set; Between the common port of resistance R 10 and inductance L 1 and ground, be connected in series two divider resistance R11 and R17, and it is in parallel with divider resistance R17 that capacitor C 15 is set, and the common port of two divider resistance R11 and R17 couples the base stage of transistor Q3, and this transistorized grounded emitter, collector electrode couple the common port of resistance R 12 and capacitor C 10.
2. according to the described power supply processing circuit for audio-frequency power amplifier of claim 1, it is characterized in that, be connected capacitor C 8 between the anode of diode D4 and the ground.
3. according to the described power supply processing circuit for audio-frequency power amplifier of claim 1, it is characterized in that the base stage of transistor Q3 connects the anode of diode D5, and connect the common port of two divider resistance R11 and R17 behind the negative electrode series resistor R14 of diode D5.
4. according to the described power supply processing circuit for audio-frequency power amplifier of claim 1, it is characterized in that, between the common port of resistance R 10 and inductance L 1 and ground, filter capacitor C4 is set.
5. according to the described power supply processing circuit for audio-frequency power amplifier of claim 1, it is characterized in that, between the positive supply input pin of audio-frequency power amplifier and the ground at least one electrochemical capacitor is set, and the minus earth of this electrochemical capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320138932 CN203166841U (en) | 2013-03-25 | 2013-03-25 | Power supply processing circuit for audio power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320138932 CN203166841U (en) | 2013-03-25 | 2013-03-25 | Power supply processing circuit for audio power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203166841U true CN203166841U (en) | 2013-08-28 |
Family
ID=49027994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320138932 Expired - Fee Related CN203166841U (en) | 2013-03-25 | 2013-03-25 | Power supply processing circuit for audio power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203166841U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105630125A (en) * | 2014-10-29 | 2016-06-01 | 中兴通讯股份有限公司 | Data protection method and apparatus as well as power supply module |
| CN112969131A (en) * | 2021-04-25 | 2021-06-15 | 孟闯 | High-fidelity sound box and implementation method thereof |
-
2013
- 2013-03-25 CN CN 201320138932 patent/CN203166841U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105630125A (en) * | 2014-10-29 | 2016-06-01 | 中兴通讯股份有限公司 | Data protection method and apparatus as well as power supply module |
| CN112969131A (en) * | 2021-04-25 | 2021-06-15 | 孟闯 | High-fidelity sound box and implementation method thereof |
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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: 20130828 Termination date: 20140325 |