CN203166837U - Class AB power amplifier - Google Patents
Class AB power amplifier Download PDFInfo
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- CN203166837U CN203166837U CN 201220742569 CN201220742569U CN203166837U CN 203166837 U CN203166837 U CN 203166837U CN 201220742569 CN201220742569 CN 201220742569 CN 201220742569 U CN201220742569 U CN 201220742569U CN 203166837 U CN203166837 U CN 203166837U
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Abstract
The utility model discloses a class AB power amplifier which comprises a signal coupler, a preset bias adjustment circuit, a synchronous signal current drive circuit and a power tube, wherein an output end of the signal coupler is connected with a first input end of the power tube and a first input end of the synchronous signal current drive circuit respectively; a first output end of the preset bias adjustment circuit is connected with the first input end of the power tube; a second output end of the preset bias adjustment circuit is connected with a second input end of the synchronous signal current drive circuit; and an output end of the synchronous signal current drive circuit is connected with a second input end of the power tube. According to the B and A type power amplifier, most current during static work of class A is recycled, so that the output power is improved greatly, a whole dynamic linear range completely comprises a linear range of the class A, the energy consumption is reduced, a high fidelity effect is achieved at the same time, and the user experience is improved greatly. The class AB power amplifier is applicable to an audio amplifier circuit.
Description
Technical field
The utility model relates to a kind of power amplifier, relates in particular to a kind of second class A power amplifier.
Background technology
At present, the type of known power amplifier has Class A, Class B, Class C and class D four big classes.And come branch just to have only the Class A by the analogue audio frequency power amplifier, three kinds of Class B and class ABs, but the audio-frequency power amplifier that really can reach high-fidelity just has only Class A linear audio power amplifier, because the operating state of class A amplifier is arranged within the scope of the range of linearity of amplifier, make in the scope of the range of linearity that in the whole signal period that audio signal is amplified, all is in this Class A linear amplifier, can not occur saturated and by the time nonlinear distortion, so the Class A linear amplifier obtains generally acknowledging of sound equipment circle, be subjected to the welcome of Fancier deeply, but effective delivery efficiency of class A amplifier is very low, can only reach about twenties percent to 30, all the other percent seventy or eighty all convert heat energy loss to and fall.The grid that the signal that B power amplifier then need carry out positive and negative two half period respectively by two power tubes is supplied with two power tubes through negative circuit is recommended and is amplified the back and superposeed to output transformer by anode and finish, though efficient can reach percent seventy or eighty, exist shortcomings such as nonlinear intermodulation distortion, intermodulation distortion and complex circuit.And the efficient of class AB amplifier and the distortion factor be between Class A and Class B, but fail to reach the output effect of high-fidelity.
The utility model content
In order to solve the problems of the technologies described above, the purpose of this utility model provides and a kind ofly can improve power output, and realizes a kind of second class A power amplifier of high-fidelity.
The technical scheme that the utility model adopts is:
A kind of second class A power amplifier, comprise: signal coupler, default bias adjustment circuit, synchronizing signal current driving circuit and power tube, the output of described signal coupler is connected with the first input end of power tube and the first input end of synchronizing signal current driving circuit respectively, first output of described default bias adjustment circuit is connected with the first input end of power tube, second output of described default bias adjustment circuit is connected with second input of synchronizing signal current driving circuit, and the output of described synchronizing signal current driving circuit is connected with second input of power tube.
Be further used as preferred embodiment, described signal coupler is first electric capacity, described default bias adjustment circuit comprises first resistance, second electric capacity and first potentiometer, described synchronizing signal current driving circuit comprises second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, second potentiometer, diode and transistor, described first electric capacity is connected with the first input end of power tube, described second electric capacity with after first potentiometer is in parallel again and first resistance string be connected between the first input end and ground of power tube, described the 3rd electric capacity successively with second resistance, the 3rd resistance and the 4th capacitances in series are connected between the first input end and ground of power tube, described second potentiometer is connected in parallel on the 4th electric capacity two ends, described transistorized first end is connected between second resistance and the 3rd resistance, second input of described transistorized second end and power tube, the negative pole end of diode, first end of the 5th resistance is connected with first end of the 5th electric capacity, described transistorized the 3rd end connects first end of the 4th resistance, second end of described the 4th resistance, the positive terminal of diode, second end of the 5th resistance is connected with ground with second end of the 5th electric capacity.
Be further used as preferred embodiment, described diode is fly-wheel diode.
Be further used as preferred embodiment, described the 5th electric capacity is electrochemical capacitor.
Be further used as preferred embodiment, described transistor is field effect transistor or insulated gate bipolar transistor or electron power tube or bipolar transistor or Darlington transistor.
Be further used as preferred embodiment, described power tube is electron power tube or bipolar transistor or field effect transistor or Darlington transistor or insulated gate bipolar transistor.
The beneficial effects of the utility model are:
A kind of second class A power amplifier of the utility model, comprise: signal coupler, default bias adjustment circuit, synchronizing signal current driving circuit and power tube, the output of described signal coupler is connected with the first input end of power tube and the first input end of synchronizing signal current driving circuit respectively, first output of described default bias adjustment circuit is connected with the first input end of power tube, second output of described default bias adjustment circuit is connected with second input of synchronizing signal current driving circuit, and the output of described synchronizing signal current driving circuit is connected with second input of power tube.Most electric current reclaims in the time of can passing through the Class A quiescent operation behind the utility model employing said structure, make the power of loss originally be able to whole recyclings, make its power output significantly improve, whole dynamic linear scope is crossed over the range of linearity of Class A fully, reach the linearity of Class A simultaneously, the efficient of Class B, and owing to no longer include powerful continuous direct current inflow load, can significantly reduce its caloric value, when reducing energy consumption, can reach the effect of high-fidelity, significantly promote user's experience, realize effect energy-efficient, low-carbon environment-friendly.
Description of drawings
Below in conjunction with accompanying drawing embodiment of the present utility model is described further:
Fig. 1 is the module diagram of a kind of second class A power amplifier of the utility model;
Fig. 2 is the circuit diagram of a kind of second class A power amplifier of the utility model.
Embodiment
Fig. 1 is the module diagram of a kind of second class A power amplifier of the utility model, a kind of second class A power amplifier of the utility model, comprise: signal coupler, default bias adjustment circuit, synchronizing signal current driving circuit and power tube, the output of described signal coupler is connected with the first input end of power tube and the first input end of synchronizing signal current driving circuit respectively, first output of described default bias adjustment circuit is connected with the first input end of power tube, second output of described default bias adjustment circuit is connected with second input of synchronizing signal current driving circuit, and the output of described synchronizing signal current driving circuit is connected with second input of power tube.
Be further used as preferred embodiment, described signal coupler is first capacitor C 1, described default bias adjustment circuit comprises first resistance R 1, second capacitor C 2 and the first potentiometer W1, described synchronizing signal current driving circuit comprises second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, the second potentiometer W2, diode D and transistor, described first capacitor C 1 is connected with the first input end of power tube, described second capacitor C 2 with after the first potentiometer W1 is in parallel again and 1 series connection of first resistance R between the first input end and ground of power tube, described the 3rd capacitor C 3 successively with second resistance R 2, the 3rd resistance R 3 and 4 series connections of the 4th capacitor C are between the first input end and ground of power tube, the described second potentiometer W2 is connected in parallel on the 4th capacitor C 4 two ends, described transistorized first end is connected between second resistance R 2 and the 3rd resistance R 3, second input of described transistorized second end and power tube, the negative pole end of diode D, first end of the 5th resistance R 5 is connected with first end of the 5th capacitor C 5, described transistorized the 3rd end connects first end of the 4th resistance R 4, second end of described the 4th resistance R 4, the positive terminal of diode D, second end of the 5th resistance R 5 is connected with ground with second end of the 5th capacitor C 5.
Be further used as preferred embodiment, described diode D is fly-wheel diode.
Be further used as preferred embodiment, described the 5th capacitor C 5 is electrochemical capacitor.
Be further used as preferred embodiment, described transistor is field effect transistor or insulated gate bipolar transistor or electron power tube or bipolar transistor or Darlington transistor.
Be further used as preferred embodiment, described power tube is electron power tube or bipolar transistor or field effect transistor or Darlington transistor or insulated gate bipolar transistor.
Operation principle to circuit of the present utility model elaborates below.
Wherein, when described power tube was electron power tube, described first input end was grid, and second input is negative electrode, and output is anode; When described power tube was bipolar transistor or Darlington transistor, described first input end was base stage, and second input is emitter, and output is collector electrode; When described power tube was field effect transistor, described first input end was grid, and second input is source electrode, and output is drain electrode; When described power tube was insulated gate bipolar transistor, described first input end was grid, and second input is emitter, and output is collector electrode.When described transistor was field effect transistor, described first end was grid, and second end is drain electrode, and the 3rd end is source electrode; When described transistor was insulated gate bipolar transistor, described first end was grid, and second end is collector electrode, and the 3rd end is emitter; When described transistor was bipolar transistor or Darlington transistor, described first end was base stage, and second end is collector electrode, and the 3rd end is emitter; When described transistor was electron power tube, described first end was grid, and second end is anode, and the 3rd end is negative electrode.The output of described power tube is connected with load.First end of the described first potentiometer W1 connects negative stabilized voltage power supply, and first end of the described second potentiometer W2 connects positive stabilized voltage power supply.
As the utility model one embodiment, wherein power tube adopts electron power tube, transistor adopts field effect transistor, utilize the characteristic of physical structure of the field effect transistor self of electron tube and same polarity, the organically interconnected combination of complementary length, because the internal resistance of field effect transistor when ending is very big, and internal resistance is very little during conducting, and it is withstand voltage higher, it is serially connected between the negative electrode and ground of electron power tube, the negative electrode quiescent current 95% or more of electron power tube when the operating state of Class A can be stopped, thereby make the negative electrode above earth potential of electron power tube raise, make the grid potential of electron power tube be lower than its cathode potential, thereby enter by state, then audio signal voltage is driven simultaneously the grid of electron power tube and field effect transistor, the driving electron stream after amplifying is synchronously supplied with the negative electrode of electron power tube through the drain electrode that is subjected to the field effect transistor that driven in synchronism voltage drives, for electron power tube provides the electric current that needs, and the cathode stream that provides is supplied with electron power tube by the strong and weak driven in synchronism automatically of signal, the electric current that drives the more strong supply of signal is just more big, and the electric current that drives the more weak supply of signal is just more little.The 5th capacitor C 5 also is connected between the negative electrode and ground of electron power tube, as electronic power tube cathode AC signal path over the ground, make that work in complete dynamic linear power amplifies and be achieved, make all equally when the output of electronic power tube anode is imported by gate drive signal in whole cycle of audio signal intactly to be exaggerated.Between the source electrode of field effect transistor and ground, insert an ammeter and connect with the 4th resistance R 4, can real-time monitor actual dynamic duty electric current, play simultaneously and protect and useful life of prolongation power tube.
More than be that preferable enforcement of the present utility model is specified, but the utility model is created and is not limited to described embodiment, those of ordinary skill in the art make all equivalent variations or replacement also can doing under the prerequisite of the utility model spirit, the distortion that these are equal to or replace all is included in the application's claim institute restricted portion.
Claims (6)
1. second class A power amplifier, it is characterized in that, comprise: signal coupler, default bias adjustment circuit, synchronizing signal current driving circuit and power tube, the output of described signal coupler is connected with the first input end of power tube and the first input end of synchronizing signal current driving circuit respectively, first output of described default bias adjustment circuit is connected with the first input end of power tube, second output of described default bias adjustment circuit is connected with second input of synchronizing signal current driving circuit, and the output of described synchronizing signal current driving circuit is connected with second input of power tube.
2. a kind of second class A power amplifier according to claim 1, it is characterized in that: described signal coupler is first electric capacity (C1), described default bias adjustment circuit comprises first resistance (R1), second electric capacity (C2) and first potentiometer (W1), described synchronizing signal current driving circuit comprises second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5), the 3rd electric capacity (C3), the 4th electric capacity (C4), the 5th electric capacity (C5), second potentiometer (W2), diode (D) and transistor, described first electric capacity (C1) is connected with the first input end of power tube, described second electric capacity (C2) with after first potentiometer (W1) is in parallel again and first resistance (R1) series connection between the first input end and ground of power tube, described the 3rd electric capacity (C3) successively with second resistance (R2), the 3rd resistance (R3) and the 4th electric capacity (C4) series connection are between the first input end and ground of power tube, described second potentiometer (W2) is connected in parallel on the 4th electric capacity (C4) two ends, described transistorized first end is connected between second resistance (R2) and the 3rd resistance (R3), second input of described transistorized second end and power tube, the negative pole end of diode (D), first end of the 5th resistance (R5) is connected with first end of the 5th electric capacity (C5), described transistorized the 3rd end connects first end of the 4th resistance (R4), second end of described the 4th resistance (R4), the positive terminal of diode (D), second end of the 5th resistance (R5) is connected with ground with second end of the 5th electric capacity (C5).
3. a kind of second class A power amplifier according to claim 2, it is characterized in that: described diode (D) is fly-wheel diode.
4. a kind of second class A power amplifier according to claim 2, it is characterized in that: described the 5th electric capacity (C5) is electrochemical capacitor.
5. a kind of second class A power amplifier according to claim 2, it is characterized in that: described transistor is field effect transistor or insulated gate bipolar transistor or electron power tube or bipolar transistor or Darlington transistor.
6. according to each described a kind of second class A power amplifier of claim 1-5, it is characterized in that: described power tube is electron power tube or bipolar transistor or field effect transistor or Darlington transistor or insulated gate bipolar transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220742569 CN203166837U (en) | 2012-12-28 | 2012-12-28 | Class AB power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220742569 CN203166837U (en) | 2012-12-28 | 2012-12-28 | Class AB power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203166837U true CN203166837U (en) | 2013-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220742569 Expired - Lifetime CN203166837U (en) | 2012-12-28 | 2012-12-28 | Class AB power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203166837U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107785A (en) * | 2012-12-28 | 2013-05-15 | 龙元才 | B-A class power amplifier |
-
2012
- 2012-12-28 CN CN 201220742569 patent/CN203166837U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107785A (en) * | 2012-12-28 | 2013-05-15 | 龙元才 | B-A class power amplifier |
| WO2014101450A1 (en) * | 2012-12-28 | 2014-07-03 | Long Yuancai | B-a class power amplifier |
| CN103107785B (en) * | 2012-12-28 | 2016-09-14 | 龙元才 | A kind of second class A power amplifier |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130828 Effective date of abandoning: 20160914 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |