CN2870306Y - Power-supply switch circuit for audio power amplification - Google Patents
Power-supply switch circuit for audio power amplification Download PDFInfo
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- CN2870306Y CN2870306Y CN 200520120833 CN200520120833U CN2870306Y CN 2870306 Y CN2870306 Y CN 2870306Y CN 200520120833 CN200520120833 CN 200520120833 CN 200520120833 U CN200520120833 U CN 200520120833U CN 2870306 Y CN2870306 Y CN 2870306Y
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- power amplifier
- switch circuit
- circuit
- triode
- power
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- Expired - Fee Related
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- 230000003321 amplification Effects 0.000 title 1
- 238000003199 nucleic acid amplification method Methods 0.000 title 1
- 150000001875 compounds Chemical class 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 30
- 230000007547 defect Effects 0.000 abstract 1
- 230000007812 deficiency Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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Abstract
The utility model relates to a power switch circuit applied on audio power amplifier. The means is a circuit with a time-delay switch between the transformer and power amplifier circuit. Time-delay switch circuit comprises a common-base compound triode amplifying circuit; the control end of the time-delay circuit is linked to the starting-up signal output end. At starting up, the power supply circuit increases the supply current gradually to overcome the technical defect that harsh noise from the speaker occurs at cold starting up, as a result, the sound quality is improved.
Description
Affiliated technical field:
The utility model relates to a kind of power switch circuit that is used for audio frequency power amplifier, particularly a kind of power switch circuit of loudspeaker noise can eliminate cold boot the time.
Background technology
At present, in the technique known, the product that has voice output, as: television set (CRT, rear-projection, liquid crystal, PDP etc.), sound equipment etc. all are that the transformer in the power circuit directly is connected with the power input of audio frequency power amplifier through diode, and filter capacitor is connected between diode and the audio frequency power amplifier.After shutdown long-time slightly (greater than 15 minutes), suddenly start can make the filter capacitor rapid large-current charging of audio frequency power amplifier powered on moment on the passage of loudspeaker output signal, and rank exceeding signal moment is added on the loudspeaker, therefore, can make loudspeaker send very harsh noise.
Summary of the invention:
In order to overcome in the prior art, loudspeaker send the technical deficiency of ear-piercing noise during cold boot, the utility model provides a kind of amplifier power supply switching circuit, it is when adopting start, power circuit increases the supply current to loudspeaker gradually, and loudspeaker send the technical deficiency of ear-piercing noise when realizing overcoming cold boot.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of power switch circuit that is used for audio frequency power amplifier, comprise transformer, diode and filter capacitor, the transformer voltage output is connected with the power amplifier voltage input end through diode, between diode and power amplifier, be provided with filter capacitor, filter capacitor is an electrochemical capacitor, the filter capacitor minus earth, positive pole is connected between diode and the power amplifier, be connected with delay switch circuit between the positive pole of filter capacitor C1 and the power amplifier, the voltage input end of delay switch circuit is connected with the output of the voltage of transformer, the voltage output end of delay switch circuit is connected with the input of the voltage of power amplifier, and the signal input end of delay switch circuit is connected with the starting-up signal output.Delay switch circuit is a common base compound transistor amplifying circuit, its structure is to be connected with triode V1 between the positive pole of filter capacitor C1 and the power amplifier, resistance R 1 and the triode V2 ground connection of the base stage of triode V1 through being connected in series, the resistance R 2 of the base stage of triode V2 through being connected in series is connected with the starting-up signal output with R3, be connected with the positive pole of electrochemical capacitor C2 between resistance R 2 and the R3, electrochemical capacitor C2 minus earth.
The beneficial effects of the utility model are: equipment loudspeaker when cold boot that television set, sound equipment etc. has voice output do not produce noise, improve acoustic mass.
Description of drawings:
Below in conjunction with drawings and Examples the utility model is described further.
Figure is the utility model electrical block diagram.
Among the figure, 1, transformer, 2, power amplifier, 3, the starting-up signal output.
Embodiment:
Present embodiment is a preferred forms of the present utility model.Referring to accompanying drawing, transformer 1 is connected with power amplifier 2 with triode V1 by the diode WD1 that is connected in series, be provided with filter capacitor C1 between diode WD1 and the triode V1, filter capacitor C1 adopts electrochemical capacitor, filter capacitor C1 minus earth, positive pole are connected between diode WD1 and the triode V1.Resistance R 1 and the triode V2 ground connection of the base stage of triode V1 by being connected in series.The base stage of triode V2 is connected with starting-up signal output 3 by resistance R 2, the R3 of series connection, is connected with the positive pole of electrochemical capacitor C2 between resistance R 2 and the R3, electrochemical capacitor C2 minus earth.After the device power supply (DPS) switch opens that has audio frequency output, starting-up signal output 3 output high level to electrochemical capacitor C2 charging, slowly rise capacitor C 2 voltages by resistance R 3, when the voltage of capacitor C 2 surpasses the junction voltage of triode V2, triode V2 conducting.Along with the charging of capacitor C 2, triode V2 collector current slowly rises, and triode V1 base current rises simultaneously, and the electric current between the triode V1 collector and emitter increases gradually.After the C2 charging is finished, triode V2 conducting electric current, promptly the base current of triode V1 reaches maximum, and triode V1 is saturated fully, is equivalent to short circuit, the power amplifier operate as normal.Because transformer output is powered to power amplifier by this circuit, supply current slowly rises, thereby has eliminated the noise when starting shooting.Triode V1 should adopt large power triode, to satisfy power amplifier load needs.
Claims (2)
1, a kind of power switch circuit that is used for audio frequency power amplifier, comprise transformer, diode and filter capacitor, the transformer voltage output is connected with the power amplifier voltage input end through diode, between diode and power amplifier, be provided with filter capacitor, filter capacitor is an electrochemical capacitor, the filter capacitor minus earth, positive pole is connected between diode and the power amplifier, it is characterized in that: the positive pole of described filter capacitor C1 and power amplifier are connected with delay switch circuit between (2), the voltage input end of delay switch circuit is connected with the voltage output of transformer (1), the voltage output end of delay switch circuit is connected with the voltage input of power amplifier (2), and the signal input end of delay switch circuit is connected with starting-up signal output (3).
2, a kind of power switch circuit that is used for audio frequency power amplifier according to claim 1, it is characterized in that: described delay switch circuit is a common base compound transistor amplifying circuit, its structure is to be connected with triode V1 between the positive pole of filter capacitor C1 and the power amplifier (2), resistance R 1 and the triode V2 ground connection of the base stage of triode V1 through being connected in series, the resistance R 2 of the base stage of triode V2 through being connected in series is connected with starting-up signal output (3) with R3, be connected with the positive pole of electrochemical capacitor C2 between resistance R 2 and the R3, electrochemical capacitor C2 minus earth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520120833 CN2870306Y (en) | 2005-12-15 | 2005-12-15 | Power-supply switch circuit for audio power amplification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520120833 CN2870306Y (en) | 2005-12-15 | 2005-12-15 | Power-supply switch circuit for audio power amplification |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2870306Y true CN2870306Y (en) | 2007-02-14 |
Family
ID=37725249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520120833 Expired - Fee Related CN2870306Y (en) | 2005-12-15 | 2005-12-15 | Power-supply switch circuit for audio power amplification |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2870306Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101587739B (en) * | 2008-05-19 | 2012-03-28 | 鸿富锦精密工业（深圳）有限公司 | Audio play device |
| CN111313674A (en) * | 2019-11-06 | 2020-06-19 | 北京比特大陆科技有限公司 | Power-on control circuit and electronic equipment with same |
| CN112118501A (en) * | 2020-09-15 | 2020-12-22 | 陕西宝成航空仪表有限责任公司 | Airborne microphone signal amplifying circuit with howling suppression function |
-
2005
- 2005-12-15 CN CN 200520120833 patent/CN2870306Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101587739B (en) * | 2008-05-19 | 2012-03-28 | 鸿富锦精密工业（深圳）有限公司 | Audio play device |
| CN111313674A (en) * | 2019-11-06 | 2020-06-19 | 北京比特大陆科技有限公司 | Power-on control circuit and electronic equipment with same |
| CN112118501A (en) * | 2020-09-15 | 2020-12-22 | 陕西宝成航空仪表有限责任公司 | Airborne microphone signal amplifying circuit with howling suppression function |
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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: 20070214 Termination date: 20111215 |