CN108377097A - A kind of auxiliary power supply circuit of power amplifier - Google Patents
A kind of auxiliary power supply circuit of power amplifier Download PDFInfo
- Publication number
- CN108377097A CN108377097A CN201810156182.XA CN201810156182A CN108377097A CN 108377097 A CN108377097 A CN 108377097A CN 201810156182 A CN201810156182 A CN 201810156182A CN 108377097 A CN108377097 A CN 108377097A
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- CN
- China
- Prior art keywords
- module
- power amplifier
- buck
- circuit
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of auxiliary power supply circuits of power amplifier comprising switch power module, high voltage thin-film capacitor, buck on-off circuit module, control module and power amplifier module.Switch power module is powered for power amplifier module.Switch power module is connect by an auxiliary winding with the high voltage thin-film capacitor.High voltage thin-film capacitor is a part for buck on-off circuit module.Buck on-off circuit module is power amplifier module auxiliary power supply.Control module is connected with the transistor in the input terminal of power amplifier module and buck on-off circuit module respectively.Control module controls buck switching circuit by the variation of power amplifier module input signal.The present invention is since when input signal amplitude of variation is big, driving buck switching circuit provides additional electric energy for power amplifier module, the transient response of power module is improved, so as to improve the audio performance of power amplifier product.
Description
Technical field
The present invention relates to electronic circuit technology field, more particularly to the auxiliary power supply circuit of a kind of power amplifier.
Background technology
Switching Power Supply is a pith of power amplifier product, and the speed of the transient response of power supply decides power amplifier product
Sound quality quality.The Switching Power Supply of power amplifier product at present, transient response are adjusted according to the variation of its output end, however due to needing
To pass through power amplifier, the variation of power amplifier output not be fed directly to Switching Power Supply, thus the transient response of Switching Power Supply some not
Foot.And the input signal of audio frequency power amplifier is the audio signal that frequency is indefinite, amplitude is indefinite, it may appear that the letter of similar impulse signal
Number input, the supply voltage of power amplifier does not reach requirement at this time, cause play music distortion.
Invention content
In view of the above problems, the present invention provides a kind of auxiliary power supply circuit of power amplifier.
The auxiliary power supply circuit of the power amplifier of embodiment of the present invention comprising switch power module, high voltage thin-film capacitor,
Buck on-off circuit module, control module and power amplifier module.The switch power module is powered for the power amplifier module.It is described
Switch power module includes a transformer, is connect with the high voltage thin-film capacitor by installing an auxiliary winding additional.The height is resistance to
Ironed membrane capacitance is a part for the buck on-off circuit module.The buck on-off circuit module is the power amplifier mould
Block auxiliary power supply.The control module respectively in the input terminal of the power amplifier module and the buck on-off circuit module
Transistor is connected.The control module controls the buck switch electricity by the variation of the power amplifier module input signal
Road.
The present invention installs a low power auxiliary winding additional by the transformer secondary included in the switch power module, is
The high voltage thin-film capacitor charging.The control module works as the input signal for receiving that pace of change is more than preset value
When, it sends Continuity signal to the transistor of the buck switching circuit and turns it on, the buck switching circuit will at this time
Electric energy in the high voltage thin-film capacitor is released rapidly in several fixed cycles, and institute is given together with the switch power module
State power amplifier module power supply.
Present invention employs low power auxiliary windings, have substantially no effect on quiescent dissipation at work；Using being several times as much as just
The high voltage thin-film capacitor of normal operating voltage, ensure that the capacitance can store enough energy and the ability height that sparks；By
In when input signal amplitude of variation is big, control module driving buck switching circuit provides additional electric energy for power amplifier module,
The transient response for improving power module, so as to improve the audio performance of power amplifier product.
In order to which the above of the present invention can be clearer and more comprehensible, preferred embodiment cited below particularly, and coordinate institute's accompanying drawings,
It is described in detail below.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the high-level schematic functional block diagram of the auxiliary power supply circuit of the power amplifier of the present invention；
Fig. 2 is the example of input audio signal；
Fig. 3 is the control logic of the control module of the present invention；
Fig. 4 is the schematic diagram of the buck switching circuit of one embodiment of the invention；
It is numbered in figure：
10：The auxiliary power supply circuit of the power amplifier
110：The switch power module
1101：The auxiliary winding of transformer
120、220：The buck on-off circuit module
1201、2201：The high voltage thin-film capacitor
130、230：The control module
140：The power amplifier module
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.Therefore, below to the reality of the present invention provided in the accompanying drawings
The detailed description for applying example is not intended to limit the range of claimed invention, but is merely representative of the selected implementation of the present invention
Example.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts
Every other embodiment, shall fall within the protection scope of the present invention.
Referring to Fig. 1, the auxiliary power supply circuit 10 of the power amplifier of the present invention comprising switch power module 110, buck are opened
Close circuit module 120, high voltage thin-film capacitor 1201, control module 130 and power amplifier module 140.Switch power module 110 passes through
Internal transformer is powered for power amplifier module 140, is installed additional in auxiliary winding 1101 and buck on-off circuit module 120 further through one
High voltage thin-film capacitor 1201 connect, due to transformer auxiliary winding output be AC signal, therefore add a diode.Control
Module 130 is connected with the transistor of the input terminal of power amplifier module 140 and buck on-off circuit module 120, defeated by analyzing
The variation for entering signal carrys out the switch of controlling transistor, is assisted to power amplifier module 140 to control buck on-off circuit module 120
Power supply.
Referring to Fig. 2, visible input audio signal frequency and amplitude are indefinite, and had on a large scale in very short time
Variation.
Referring to Fig. 3, the control module 130 of the present invention controls crystalline substance in buck on-off circuit module by such as figure step
The switch of body pipe：Input signal similar to Figure 2 is sampled every extremely short time interval first, then with continuous two
The difference divided by the difference of double sampling time of the input signal amplitude of secondary sampling, obtain the pace of change of input signal, then should
Pace of change amplification is compared with preset value, decides whether to send Continuity signal to the crystalline substance in buck switching circuit
Body pipe.If amplified pace of change is more than preset value, the Continuity signal of several fixed cycles is sent to crystal
Pipe is power amplifier module auxiliary power supply.Power supply is still inadequate when herein that pace of change amplification is relatively low to prevent sampling precision.
Referring to Fig. 4, using buck switching circuit 120 as shown in the figure in one embodiment of the invention.C1 is that high voltage is thin
Membrane capacitance, which is usually operated at be several times as much as normal working voltage in the case of, according to capacitive energy formula：W=1/2CU2,
High voltage thin-film capacitor, which can be obtained, can store more energy for using, and capacitance ability that sparks itself is stronger.Control
The switch of the controlling transistor Q through the above steps of module 230, power amplifier module is supplied to by output voltage V, is its auxiliary power supply.
Example the above is only the implementation of the present invention is not intended to limit the scope of the invention, every to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (5)
1. a kind of auxiliary power supply circuit of power amplifier, which is characterized in that including switch power module, high voltage thin-film capacitor, decompression
Formula on-off circuit module, control module and power amplifier module.The switch power module is powered for the power amplifier module.The switch
Power module is connect with the high voltage thin-film capacitor.The high voltage thin-film capacitor is the buck on-off circuit module
A part.The buck on-off circuit module is powered in conducting for the power amplifier module.The control module respectively with institute
The input terminal for stating power amplifier module is connected with the buck on-off circuit module.
2. the auxiliary power supply circuit of power amplifier as described in claim 1, which is characterized in that the switch power module contains a change
Depressor is powered for the power amplifier module.
3. the auxiliary power supply circuit of power amplifier as described in claim 1, which is characterized in that the switch power module has installed additional auxiliary
Winding is helped, is the high voltage thin-film capacitor charging in the buck switching circuit.
4. the auxiliary power supply circuit of power amplifier as described in claim 1, which is characterized in that the control module and the power amplifier mould
The input terminal of block is connected, and by being sampled, being calculated to input signal, compared, is sent to the buck on-off circuit module
Signal.
5. the auxiliary power supply circuit of power amplifier as described in claim 1, which is characterized in that the buck switching circuitry output
It is connected with the power amplifier module, the buck on-off circuit module is the power amplifier module auxiliary power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810156182.XA CN108377097A (en) | 2018-02-14 | 2018-02-14 | A kind of auxiliary power supply circuit of power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810156182.XA CN108377097A (en) | 2018-02-14 | 2018-02-14 | A kind of auxiliary power supply circuit of power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108377097A true CN108377097A (en) | 2018-08-07 |
Family
ID=63017926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810156182.XA Withdrawn CN108377097A (en) | 2018-02-14 | 2018-02-14 | A kind of auxiliary power supply circuit of power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108377097A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1220567A (en) * | 1997-12-19 | 1999-06-23 | 摩托罗拉公司 | Electronic circuit for portable electronic device |
| CN101345482A (en) * | 2008-08-22 | 2009-01-14 | 戴俊 | Composite power supply |
| CN102427293A (en) * | 2012-01-11 | 2012-04-25 | 西南交通大学 | Low output ripple wave parallel power-factor correction (PFC) transform control method and device |
| CN202444413U (en) * | 2012-01-11 | 2012-09-19 | 西南交通大学 | Parallel connection power factor correction converter with low output ripple |
| CN105898946A (en) * | 2014-12-12 | 2016-08-24 | 南京工业大学 | Method for realizing LED lighting driving power supply without electrolytic capacitor |
-
2018
- 2018-02-14 CN CN201810156182.XA patent/CN108377097A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1220567A (en) * | 1997-12-19 | 1999-06-23 | 摩托罗拉公司 | Electronic circuit for portable electronic device |
| CN101345482A (en) * | 2008-08-22 | 2009-01-14 | 戴俊 | Composite power supply |
| CN102427293A (en) * | 2012-01-11 | 2012-04-25 | 西南交通大学 | Low output ripple wave parallel power-factor correction (PFC) transform control method and device |
| CN202444413U (en) * | 2012-01-11 | 2012-09-19 | 西南交通大学 | Parallel connection power factor correction converter with low output ripple |
| CN105898946A (en) * | 2014-12-12 | 2016-08-24 | 南京工业大学 | Method for realizing LED lighting driving power supply without electrolytic capacitor |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180807 |