CN203423793U - Class-D power amplifier regulation circuit - Google Patents
Class-D power amplifier regulation circuit Download PDFInfo
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- CN203423793U CN203423793U CN201320488277.4U CN201320488277U CN203423793U CN 203423793 U CN203423793 U CN 203423793U CN 201320488277 U CN201320488277 U CN 201320488277U CN 203423793 U CN203423793 U CN 203423793U
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- power amplifier
- resistance
- switch
- class power
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Abstract
Embodiments of the utility model disclose a Class-D power amplifier regulation circuit, which can regulate the voltage upon the adjustment of the volume, effectively improving the resolution of a PWM output of a Class-D power amplifier and improving the fidelity. According the embodiment, the Class-D power amplifier regulation circuit comprises a volume adjuster and a voltage regulator which are connected with the Class-D power amplifier, and a synchronizer connected with the volume adjuster and the voltage regulator. By the synchronizer, the volume adjuster and the voltage regulator can be adjusted simultaneously, thereby effectively improving the resolution of the PWM output of the Class-D power amplifier and improving the fidelity.
Description
Technical field
The utility model relates to electronic circuit field, relates in particular to a kind of D class power amplifier regulating circuit.
Background technology
The application of D class power amplifier is very extensive, from telephone set, broadcast receiver, television set, stereo set, until modern mobile phone, MP3 player, LCD television set, computer stereo ... can adopt D class power amplifier.Because the great advantage of D class power amplifier is that efficiency is high, power saving, so it is specially adapted to adopt battery powered equipment.Such as mobile phone, notebook computer, Portable DVD player etc.These equipment can greatly extend the life of a cell after having adopted D class power amplifier.Other is as powerful stereo set, because power consumption is very large, so be to be also starved of to adopt high efficiency D class power amplifier.
The technology that D class power amplifier adopts is pulse-width modulation (PWM, Pulse Width Modulation) technology.So-called pulse modulation technology is the amplitude of simulated audio signal to be modulated to the width of series of rectangular pulse.Like this, a simulated audio signal has just become the constant amplitude pulse signal that a series of width are modulated.Signal to be amplified, as long as amplify just passable to this serial pulse signal.And original analog signal is not to be included among the amplitude of this pulse signal, and be included among its width.As long as this is amplified to the low frequency component comprising in later pulse-width signal leaches just can be amplified later audio signal.
Yet when the D class power amplifier that is generally used for home theater is appreciated for hi-fi music, user generally reflects that its fidelity is not high enough, high band tonequality is coarse.Because the output resolution ratio of D class power amplifier PWM circuit (chip) is directly related with amplifier power supply voltage.When supply voltage equals sine wave output peak value, the width of PWM output reaches the widest.That is to say, PWM now reaches maximum resolution in output between the peak period, otherwise, when the crest voltage of the sine wave output of power amplifier be only supply voltage 1/3 time, the width that its PWM exports can only reach 1/3 of above-mentioned width.The resolution that is to say output audio voltage has been lowered.Can not make full use of the resolution of PWM drive IC output width, the audio signal of just cannot precise restoration inputting, is just difficult to realize high-fidelity and has play.
Utility model content
The utility model embodiment provides a kind of D class power amplifier regulating circuit, can be when regulating volume regulation voltage, effectively improved the resolution of D class power amplifier PWM output, improve fidelity.
The utility model embodiment provides a kind of D class power amplifier regulating circuit specifically to comprise:
The volume adjuster being connected with D class power amplifier is with voltage regulator and be connected volume adjuster and the synchronizer of voltage regulator.
Optionally,
Voltage regulator comprises: positive voltage regulators and negative voltage regulator.
Optionally,
Positive voltage regulators comprises:
The first positive supply, the second positive supply and the first switch, one end of the first switch can with the first positive supply or the second positive supply conducting, the positive power source terminal of the other end and D class power amplifier electrically connects;
Negative voltage regulator comprises:
The first negative supply, the second negative supply and second switch, one end of second switch can with the first negative supply or the second negative supply conducting, the negative power end of the other end and D class power amplifier electrically connects;
Volume adjuster comprises:
The first resistance, the second resistance and the 3rd switch, one end of the 3rd switch can electrically connect with the first resistance or the second resistance, and the anti-phase incoming end of the other end and D class power amplifier electrically connects.
The first switch, second switch and the 3rd switch are connected with synchronizer.
Optionally,
The first switch, second switch and the 3rd switch are electric switch and/or electronic switch.
Optionally,
Positive voltage regulators is the first potentiometer; Negative voltage regulator is the second potentiometer; Volume adjuster is the 3rd potentiometer;
First potentiometer one end connects positive source, and the other end connects the positive power source terminal of D class power amplifier;
Second potentiometer one end connects power cathode, and the other end connects the negative power end of D class power amplifier;
The 3rd potentiometer is connected with the anti-phase incoming end of D class power amplifier.
Optionally,
Circuit also comprises positive three terminal regulator and negative three terminal regulator;
Positive three terminal regulator and positive source electrically connect;
Negative three terminal regulator and power cathode electrically connect.
Optionally,
This circuit also comprises the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance;
The 3rd resistance one end and the anti-phase incoming end of D class power amplifier electrically connect, other end ground connection;
The 4th resistance one end and the first potentiometer electrically connect, other end ground connection;
The 5th resistance one end and the second potentiometer electrically connect, other end ground connection;
The 6th resistance one end and the first potentiometer electrically connect, and the other end and D class power amplifier positive power source terminal electrically connect;
The 7th resistance one end and the second potentiometer electrically connect, and the other end and D class power amplifier negative power end electrically connect.
As can be seen from the above technical solutions, the utility model embodiment has the following advantages:
A kind of D class power amplifier regulating circuit that the utility model embodiment provides, specifically comprises: the volume adjuster being connected with D class power amplifier is with voltage regulator and be connected volume adjuster and the synchronizer of voltage regulator.By synchronizer, regulation voltage adjuster when regulating volume adjuster, has effectively improved the resolution that D class power amplifier PWM exports, and improves fidelity.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of a kind of D class power amplifier regulating circuit the first embodiment in the utility model embodiment;
Fig. 2 is the circuit structure diagram of a kind of D class power amplifier regulating circuit the second embodiment in the utility model embodiment;
Fig. 3 is the circuit structure diagram of a kind of D class power amplifier regulating circuit the 3rd embodiment in the utility model embodiment.
Embodiment
The utility model embodiment provides a kind of D class power amplifier regulating circuit, can be when regulating volume regulation voltage, effectively improved the resolution of D class power amplifier PWM output, improve fidelity.
Refer to Fig. 1, the first embodiment of a kind of D class power amplifier regulating circuit that the utility model embodiment provides, specifically comprises:
The volume adjuster being connected with D class power amplifier is with voltage regulator and be connected volume adjuster and the synchronizer of voltage regulator.
In the present embodiment, by synchronizer, regulation voltage adjuster when regulating volume adjuster, has effectively improved the resolution that D class power amplifier PWM exports, and improves fidelity.
Above a kind of D class power amplifier regulating circuit the first embodiment in the utility model embodiment is described in detail, refer to Fig. 2, in the present embodiment, in a kind of D class power amplifier regulating circuit the second embodiment, voltage regulator further comprises: positive voltage regulators and negative voltage regulator; Wherein, positive voltage regulators comprises: one end of the first positive supply+E, the second positive supply+E1 and the first switch S 1, the first switch S 1 can with the first positive supply+E or the second positive supply+E1 conducting, the positive power source terminal of the other end and D class power amplifier electrically connects; Negative voltage regulator comprises: the first negative supply-E, the second negative supply-E1 and second switch S2, one end of second switch S2 can with the first negative supply-E or the second negative supply-E1 conducting, the negative power end of the other end and D class power amplifier electrically connects; Volume adjuster comprises: one end of the first resistance R 1, the second resistance R 2 and the 3rd switch S 3, the three switch S 3 can electrically connect with the first resistance R 1 or two resistance R 2, and the anti-phase incoming end of the other end and D class power amplifier electrically connects.
Synchronizer is connected with the first switch, second switch and the 3rd switch, for making the first switch, second switch and the 3rd switch carry out adjusted in concert.
It should be noted that, the first positive supply+E can be greater than the second positive supply+E1, and the first negative supply-E can be less than the second negative supply-E1, and the first resistance R 1 can be greater than the second resistance R 2.
It should be noted that, the first switch S 1, second switch S2 and the 3rd switch S 3 are electric switch and/or electronic switch.
Above the second embodiment of a kind of D class power amplifier regulating circuit in the utility model embodiment is described, refers to Fig. 3 below, in the 3rd embodiment of a kind of D class of the utility model embodiment power amplifier regulating circuit, positive voltage regulators is the first potentiometer RW1; Negative voltage regulator is the second potentiometer RW2; Volume adjuster is the 3rd potentiometer RW3;
First potentiometer RW1 one end connects positive source, and the other end connects the positive power source terminal of D class power amplifier, for regulating positive voltage;
Second potentiometer RW2 one end connects power cathode, and the other end connects the negative power end of D class power amplifier, for regulating negative voltage.
The 3rd potentiometer RW3 is connected with the anti-phase incoming end of D class power amplifier.
Synchronizer and the first potentiometer RW1, the second potentiometer RW2 and the 3rd potentiometer RW3 electrically connect, for making the first potentiometer RW1, the second potentiometer RW2 and the 3rd potentiometer RW3 carry out adjusted in concert.
It should be noted that, the 3rd potentiometer RW3 is also for regulating D class volume of power amplifier size.
This circuit further comprises positive three terminal regulator T1 and negative three terminal regulator T2;
Positive three terminal regulator T1 and positive source electrically connect; Negative three terminal regulator T2 and power cathode electrically connect.Positive three terminal regulator T1 and negative three terminal regulator T2 are for stabilizing circuit voltage.
This circuit further comprises the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6 and the 7th resistance R 7;
The 3rd resistance R 3 one end and the anti-phase incoming end of D class power amplifier electrically connect, other end ground connection;
The 4th resistance R 4 one end and the first potentiometer RW1 electrically connect, other end ground connection;
The 5th resistance R 5 one end and the second potentiometer RW2 electrically connect, other end ground connection;
The 6th resistance R 6 one end and the first potentiometer RW1 electrically connect, and the other end and D class power amplifier positive power source terminal electrically connect;
The 7th resistance R 7 one end and the second potentiometer RW2 electrically connect, and the other end and D class power amplifier negative power end electrically connect.
Wherein the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6 and the 7th resistance R 7 are for amplitude limit.
The above, above embodiment only, in order to the technical solution of the utility model to be described, is not intended to limit; Although the utility model is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (7)
1. a D class power amplifier regulating circuit, is characterized in that, comprising:
The volume adjuster being connected with D class power amplifier and voltage regulator and be connected the synchronizer of described volume adjuster and described voltage regulator.
2. D class power amplifier regulating circuit according to claim 1, is characterized in that,
Described voltage regulator comprises: positive voltage regulators and negative voltage regulator.
3. D class power amplifier regulating circuit according to claim 2, is characterized in that,
Described positive voltage regulators comprises:
The first positive supply, the second positive supply and the first switch, one end of described the first switch can with described the first positive supply or described the second positive supply conducting, the positive power source terminal of the other end and described D class power amplifier electrically connects;
Described negative voltage regulator comprises:
The first negative supply, the second negative supply and second switch, one end of described second switch can with described the first negative supply or described the second negative supply conducting, the negative power end of the other end and described D class power amplifier electrically connects;
Described volume adjuster comprises:
The first resistance, the second resistance and the 3rd switch, one end of described the 3rd switch can electrically connect with described the first resistance or described the second resistance, and the anti-phase incoming end of the other end and described D class power amplifier electrically connects;
Described the first switch, described second switch and described the 3rd switch are connected with described synchronizer.
4. D class power amplifier regulating circuit according to claim 3, is characterized in that,
Described the first switch, second switch and the 3rd switch are electric switch and/or electronic switch.
5. D class power amplifier regulating circuit according to claim 2, is characterized in that,
Described positive voltage regulators is the first potentiometer; Described negative voltage regulator is the second potentiometer; Described volume adjuster is the 3rd potentiometer;
Described first potentiometer one end connects positive source, and the other end connects the positive power source terminal of described D class power amplifier;
Described second potentiometer one end connects power cathode, and the other end connects the negative power end of described D class power amplifier;
Described the 3rd potentiometer is connected with the anti-phase incoming end of described D class power amplifier.
6. D class power amplifier regulating circuit according to claim 5, is characterized in that,
Described circuit also comprises positive three terminal regulator and negative three terminal regulator;
Described positive three terminal regulator and positive source electrically connect;
Described negative three terminal regulator and power cathode electrically connect.
7. according to the D class power amplifier regulating circuit described in claim 5 or 6, it is characterized in that,
Described circuit also comprises the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance;
Described the 3rd resistance one end and the anti-phase incoming end of described D class power amplifier electrically connect, other end ground connection;
Described the 4th resistance one end and described the first potentiometer electrically connect, other end ground connection;
Described the 5th resistance one end and described the second potentiometer electrically connect, other end ground connection;
Described the 6th resistance one end and described the first potentiometer electrically connect, and the other end and described D class power amplifier positive power source terminal electrically connect;
Described the 7th resistance one end and described the second potentiometer electrically connect, and the other end and described D class power amplifier negative power end electrically connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320488277.4U CN203423793U (en) | 2013-08-09 | 2013-08-09 | Class-D power amplifier regulation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320488277.4U CN203423793U (en) | 2013-08-09 | 2013-08-09 | Class-D power amplifier regulation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203423793U true CN203423793U (en) | 2014-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320488277.4U Expired - Fee Related CN203423793U (en) | 2013-08-09 | 2013-08-09 | Class-D power amplifier regulation circuit |
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| CN (1) | CN203423793U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106878863A (en) * | 2017-03-03 | 2017-06-20 | 广东欧珀移动通信有限公司 | The voltage adjusting method of power supply and power amplification system and power amplification system |
-
2013
- 2013-08-09 CN CN201320488277.4U patent/CN203423793U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106878863A (en) * | 2017-03-03 | 2017-06-20 | 广东欧珀移动通信有限公司 | The voltage adjusting method of power supply and power amplification system and power amplification system |
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| Date | Code | Title | Description |
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| 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: 20140205 Termination date: 20180809 |
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| CF01 | Termination of patent right due to non-payment of annual fee |