CN113381708A - Power amplifier - Google Patents
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- CN113381708A CN113381708A CN202110496952.7A CN202110496952A CN113381708A CN 113381708 A CN113381708 A CN 113381708A CN 202110496952 A CN202110496952 A CN 202110496952A CN 113381708 A CN113381708 A CN 113381708A
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- 230000003321 amplification Effects 0.000 claims abstract description 30
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 30
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 28
- 239000003990 capacitor Substances 0.000 claims description 42
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 22
- 229910052709 silver Inorganic materials 0.000 claims description 22
- 239000004332 silver Substances 0.000 claims description 22
- 230000008859 change Effects 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/213—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only in integrated circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Amplifiers (AREA)
Abstract
The present invention relates to an amplifying circuit, and more particularly, to a power amplifier. The power supply comprises a power supply, a voltage stabilizing module and a signal amplifying circuit, wherein the signal amplifying circuit comprises a signal amplifying circuit and an auxiliary amplifying circuit; the signal amplification circuit is connected with the power supply and the voltage stabilizing module in series, and amplifies the signal filtered by the voltage stabilizing module; the signal amplification circuit and the auxiliary amplification circuit are connected in parallel, and the current is adjusted when the signal amplification circuit amplifies signals through the auxiliary amplification circuit, so that the circuit is prevented from being unstable when the signal amplification circuit amplifies the signals. The auxiliary amplifying circuit is arranged to amplify the signal of the signal amplifying circuit in an auxiliary manner, and when the signal amplifying circuit amplifies the signal in an overload manner, the change of the input voltage is converted into the output current through the MOS tubes Q1 and Q2, so that the influence on the circuit when the signal amplifying circuit amplifies the signal in the overload manner is reduced, and the normal use of the circuit is protected.
Description
Technical Field
The present invention relates to an amplifying circuit, and more particularly, to a power amplifier.
Background
A power amplifier, referred to as "power amplifier" for short, refers to an amplifier that can generate maximum power output to drive a load (e.g., a speaker) under a given distortion rate. The power amplifier plays a role of 'organization and coordination' in the whole sound system, and governs to some extent whether the whole system can provide good sound quality output.
At present, when the amplification factor of a signal is too large, the circuit is easy to generate an unstable phenomenon, and the currently adopted secondary amplification circuit amplifies the signal to reduce the amplification factor of one-time amplification, so that the phenomenon of the circuit unstable to the circuit is reduced, but when the circuit generates an overload power generation signal, the circuit still generates an unstable phenomenon, so that the normal use of the circuit is influenced.
Disclosure of Invention
It is an object of the present invention to provide a power amplifier to solve the above problems in the prior art.
In order to achieve the above object, the present invention provides a power amplifier, which includes a power supply, a voltage stabilizing module and a signal amplifying circuit, wherein the signal amplifying circuit includes a signal amplifying circuit and an auxiliary amplifying circuit;
the signal amplification circuit is connected with the power supply and the voltage stabilizing module in series, and amplifies the signal filtered by the voltage stabilizing module;
the signal amplification circuit is connected with the auxiliary amplification circuit in parallel, and current is adjusted when the signal amplification circuit amplifies signals through the auxiliary amplification circuit, so that the circuit is prevented from being unstable when the signal amplification circuit amplifies the signals.
As a further improvement of the technical scheme, the signal amplifying circuit comprises a control chip P1, capacitors C1 and C2 and a sliding resistor R1, wherein two ends of the sliding resistor R1 respectively connect 1 silver pin and 8 silver pin of the control chip P1 together, the capacitors C1 and C2 are connected together in series, two ends of the capacitors C1 and C2 are respectively connected with the 4 silver pin and the 7 silver pin of the control chip P1, the 7 silver pin of the control chip P1 is connected with a power supply, and a line connected between the capacitors C1 and C2 is grounded.
As a further improvement of the present technical solution, the auxiliary amplifying circuit includes resistors R8, R9, R10, a sliding resistor R11, and MOS transistors Q1, Q2, wherein the resistors R8, R9, R10 and the sliding resistor R11 are connected in series in sequence, one end of the sliding resistor R11 is connected to the positive electrode of the power supply, one end of the resistor R8 is connected to the negative electrode of the power supply, the MOS transistors Q1, Q2 are connected in series, one leg of the MOS transistors Q1, Q2 is connected in parallel with the resistor R9, one leg of the MOS transistor Q1 is connected in series with one end of the sliding resistor R11, and one leg of the MOS transistor Q2 is connected in series with one end of the resistor R8.
As a further improvement of the technical solution, the circuit between the sliding resistor R11 and the MOS transistor Q1 is connected in series with the silver pin 7 of the control chip P1, and the silver pin 7 of the control chip P1 is connected with the circuit between the MOS transistors Q1 and Q2.
As a further improvement of the technical solution, the voltage stabilizing module includes a voltage stabilizing circuit and a filter circuit, the voltage stabilizing circuit includes a triode, and capacitors C6, C7, C8 and C9, the triode includes an input voltage terminal Vin, an output voltage terminal Vout and a ground terminal GND, the capacitors C6 and C7 are connected in parallel between the input voltage terminal Vin and the ground terminal GND, and the capacitors C8 and C9 are connected in parallel between the output voltage terminal Vout and the ground terminal GND.
As a further improvement of the technical scheme, the voltage stabilizing circuit further comprises a resistor R2 and a light emitting diode D1, wherein the resistor R2 and the light emitting diode D1 are connected in series and are connected in parallel with capacitors C8 and C9.
As a further improvement of the present technical solution, the filter circuit includes capacitors C3, C4, C5, inductors R3, R4, R5, R6, R7, and an operational amplifier B, wherein the inductors R3, R4 are connected in series, the inductors R5, R7 are connected in series, the capacitors C3, C5 are connected in series, two ends of the operational amplifier B are connected in parallel with the inductor R4, and one end of the capacitor C5 and one end of the inductor R5 are connected to one end of the operational amplifier B.
As a further improvement of the technical solution, an inductor R6 is connected between the capacitors C3 and C5, the other end of the inductor R6 is connected with one end of the inductor R4, and the inductor R7 is connected in parallel with a capacitor C4.
Compared with the prior art, the invention has the beneficial effects that:
1. in the power amplifier, an auxiliary amplifying circuit is arranged to amplify the signal of the signal amplifying circuit in an auxiliary mode, and when the signal amplifying circuit amplifies the signal in an overload mode, the change of input voltage is converted into output current through MOS (metal oxide semiconductor) tubes Q1 and Q2, so that the influence on the circuit when the signal amplifying circuit amplifies the signal in the overload mode is reduced, and the normal use of the circuit is protected.
2. In the power amplifier, the ripple of load current and voltage is reduced by the filter circuit through the arranged voltage stabilizing circuit, so that the waveform of a signal becomes smooth, and meanwhile, a weak signal transmitted by the filter circuit is amplified through a triode in the voltage stabilizing circuit, so that the signal is amplified by multiple times in the later period.
Drawings
FIG. 1 is an overall circuit block diagram of the present invention;
FIG. 2 is an overall circuit diagram of the present invention;
FIG. 3 is an enlarged circuit diagram of the present invention;
FIG. 4 is a schematic diagram of an auxiliary boost circuit of the present invention;
FIG. 5 is a diagram of a voltage regulator circuit according to the present invention;
FIG. 6 is a diagram of a filter circuit according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Example 1
The present invention provides a power amplifier, please refer to fig. 1-6, which includes a power supply, a voltage stabilizing module and a signal amplifying circuit, wherein the signal amplifying circuit includes a signal amplifying circuit and an auxiliary amplifying circuit;
the signal amplification circuit is connected with the power supply and the voltage stabilizing module in series, and amplifies the signal filtered by the voltage stabilizing module;
the signal amplification circuit and the auxiliary amplification circuit are connected in parallel, and the current is adjusted when the signal amplification circuit amplifies signals through the auxiliary amplification circuit, so that the circuit is prevented from being unstable when the signal amplification circuit amplifies the signals.
As a further improvement of the technical scheme, the signal amplifying circuit comprises a control chip P1, capacitors C1 and C2 and a sliding resistor R1, wherein two ends of the sliding resistor R1 respectively connect 1 silver pin and 8 silver pin of the control chip P1 together, the capacitors C1 and C2 are connected together in series, two ends of the capacitors C1 and C2 are respectively connected with the silver pins of 4 and 7 of the control chip P1, the silver pin of 7 of the control chip P1 is connected with a power supply, and a line connected between the capacitors C1 and C2 is grounded.
The auxiliary amplifying circuit comprises resistors R8, R9 and R10, a sliding resistor R11, MOS transistors Q1 and Q2, wherein the resistors R8, R9 and R10 and the sliding resistor R11 are sequentially connected in series, one end of the sliding resistor R11 is connected with the positive electrode of a power supply, one end of the resistor R8 is connected with the negative electrode of the power supply, the MOS transistors Q1 and Q2 are connected in series, one leg of the MOS transistors Q1 and Q2 is connected with the resistor R9 in parallel, one leg of the MOS transistor Q1 is connected with one end of the sliding resistor R11 in series, and one leg of the MOS transistor Q2 is connected with one end of the resistor R8 in series.
Furthermore, a circuit between the sliding resistor R11 and the MOS tube Q1 is connected in series with the silver pin 7 of the control chip P1, and the silver pin 7 of the control chip P1 is connected with circuits between the MOS tubes Q1 and Q2.
In the embodiment, when the circuit works specifically, the silver pins 2 and 3 of the control chip P1 receive signals transmitted by the stabilizing module, the signals are amplified through the control chip P1, when the control chip P1 amplifies the signals, the sliding resistor R1 bridged between the silver pins 1 and 8 of the control chip P1 adjusts the amplification rate of the signals as required, the pins 4 and 7 need to provide working voltages with equal positive and negative voltages, so that the voltage of the whole circuit is stabilized, the signals amplified by the sliding resistor R1 are output through the silver pin P1DE of the control chip, and the voltage in the control chip P1 is received through the capacitors C1 and C2, so that the current amount on the main circuit is reduced, and the circuit is prevented from being burned out when the current on the main circuit is too large. The voltage generated by the amplified signal is shunted to reduce the voltage on the main line and ensure the normal use of the amplifying circuit.
When the amplifying circuit amplifies signals under overload, the capacitors C1 and C2 cannot reduce the influence of the amplified signals on the amplifying circuit, at the moment, the signals amplified by the amplifying circuit are received through the resistors R8, R9, R10 and R11 to reduce the voltage on the amplifying circuit, so that the signals amplified by the amplifying circuit are stably transmitted, meanwhile, the current flowing through the transistor is influenced by projecting an electric field on an insulating layer through the field effect transistors generated by the MOS transistors Q1 and Q2, the resistors R8, R9, R10 and R11 are connected in series to divide the voltage, the effect of dividing the voltage by the resistors R8, R9, R10 and R11 is improved, and the amplified signals cannot influence the amplifying circuit when the amplifying circuit amplifies the signals under overload.
Example 2
In order to reduce the influence of the amplified signal on the amplifying circuit when the amplifying circuit amplifies the signal, referring to fig. 5-6, the voltage stabilizing module includes a voltage stabilizing circuit and a filter circuit, the voltage stabilizing circuit includes a transistor, capacitors C6, C7, C8, and C9, the transistor includes an input voltage terminal Vin, an output voltage terminal Vout, and a ground terminal GND, the capacitors C6 and C7 are connected in parallel between the input voltage terminal Vin and the ground terminal GND, and the capacitors C8 and C9 are connected in parallel between the output voltage terminal Vout and the ground terminal GND.
Further, the voltage stabilizing circuit further comprises a resistor R2 and a light emitting diode D1, wherein the resistor R2 and the light emitting diode D1 are connected in series and are connected in parallel with the capacitors C8 and C9.
Specifically, the filter circuit comprises capacitors C3, C4 and C5, inductors R3, R4, R5, R6 and R7, an operational amplifier B, inductors R3 and R4 which are connected in series, inductors R5 and R7 which are connected in series, capacitors C3 and C5 which are connected in series, two ends of the operational amplifier B are connected with the inductor R4 in parallel, and one ends of the capacitor C5 and the inductor R5 are connected with one end of the operational amplifier B.
Further, an inductor R6 is connected between the capacitors C3 and C5, the other end of the inductor R6 is connected to one end of the inductor R4, and a capacitor C4 is connected in parallel to the inductor R7.
In use, when the current flowing through the inductors R3, R4, R5, R6 and R7 changes, the induced electromotive force generated in the inductors R3, R4, R5, R6 and R7 prevents the change of the current. When the current passing through the inductance coils R3, R4, R5, R6 and R7 is increased, the self-induced electromotive force generated by the inductance coils R3, R4, R5, R6 and R7 is opposite to the current direction, so that the increase of the current is prevented, and meanwhile, a part of electric energy is converted into magnetic field energy and stored in the inductance; when the current through the inductors R3, R4, R5, R6, R7 is reduced, the self-induced electromotive force is in the same direction as the current, preventing the reduction of the current while discharging the stored energy to compensate for the reduction of the current. Therefore, after the filtering by the inductor, not only the pulsation of the load current and the voltage is reduced and the waveform becomes smooth, but also the conduction angle of the rectifier diode is increased so as to facilitate the transmission of signals.
When the inductors R3, R4, R5, R6, and R7 are not changed, the smaller the load resistance is, the smaller the ac component of the output voltage is. Good filtering effect can be obtained only when RL is less than omega L. The larger L, the better the filtering effect.
In addition, due to the action of the filter inductance electromotive force, the conduction angle of the diode is close to pi, the impact current of the diode is reduced, the current flowing through the diode is smoothed, and the service life of the rectifier diode is prolonged.
Meanwhile, the voltage stabilizing circuit receives signals transmitted by the filter circuit, the signals are received through the capacitors C6, C7, C8 and C9, the energy in the signals is received, the signals fluctuate stably, and the stable signals are amplified into electric signals with large amplitude values through the triode, so that the amplitude-modulated signals are amplified by the amplifying circuit conveniently.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A power amplifier comprises a power supply, a voltage stabilizing module and a signal amplifying circuit, and is characterized in that: the signal amplifying circuit comprises a signal amplifying circuit and an auxiliary amplifying circuit;
the signal amplification circuit is connected with the power supply and the voltage stabilizing module in series, and amplifies the signal filtered by the voltage stabilizing module;
the signal amplification circuit is connected with the auxiliary amplification circuit in parallel, and current is adjusted when the signal amplification circuit amplifies signals through the auxiliary amplification circuit, so that the circuit is prevented from being unstable when the signal amplification circuit amplifies the signals.
2. The power amplifier of claim 1, wherein: the signal amplification circuit comprises a control chip P1, capacitors C1, C2 and a sliding resistor R1, wherein the two ends of the sliding resistor R1 are used for respectively connecting 1 silver pin and 8 silver pins of the control chip P1 together, the capacitors C1 and C2 are connected in series, the two ends of the capacitors C1 and C2 are respectively connected with the silver pins of 4 and 7 of the control chip P1, the silver pin of 7 of the control chip P1 is connected with a power supply, and a line connected between the capacitors C1 and C2 is grounded.
3. The power amplifier of claim 2, wherein: the auxiliary amplifying circuit comprises resistors R8, R9, R10, a sliding resistor R11, a MOS tube Q1 and Q2, wherein the resistors R8, R9, R10 and the sliding resistor R11 are sequentially connected in series, one end of the sliding resistor R11 is connected with the positive electrode of a power supply, one end of the resistor R8 is connected with the negative electrode of the power supply, the MOS tubes Q1 and Q2 are connected in series, one leg of the MOS tubes Q1 and Q2 is connected with the resistor R9 in parallel, one leg of the MOS tube Q1 is connected with one end of the sliding resistor R11 in series, and one leg of the MOS tube Q2 is connected with one end of the resistor R8 in series.
4. The power amplifier of claim 3, wherein: the circuit between the sliding resistor R11 and the MOS transistor Q1 is connected in series with the silver pin 7 of the control chip P1, and the silver pin 7 of the control chip P1 is connected with the circuit between the MOS transistors Q1 and Q2.
5. The power amplifier of claim 2, wherein: the voltage stabilizing module comprises a voltage stabilizing circuit and a filter circuit, wherein the voltage stabilizing circuit comprises a triode, capacitors C6, C7, C8 and C9, the triode comprises an input voltage end Vin, an output voltage end Vout and a ground end GND, the capacitors C6 and C7 are connected in parallel between the input voltage end Vin and the ground end GND, and the capacitors C8 and C9 are connected in parallel between the output voltage end Vout and the ground end GND.
6. The power amplifier of claim 5, wherein: the voltage stabilizing circuit further comprises a resistor R2 and a light emitting diode D1, wherein the resistor R2 and the light emitting diode D1 are connected in series and are connected with the capacitors C8 and C9 in parallel.
7. The power amplifier of claim 6, wherein: the filter circuit comprises capacitors C3, C4 and C5, inductors R3, R4, R5, R6 and R7 and an operational amplifier B, wherein the inductors R3 and R4 are connected in series, the inductors R5 and R7 are connected in series, the capacitors C3 and C5 are connected in series, two ends of the operational amplifier B are connected with the inductor R4 in parallel, and one ends of the capacitor C5 and the inductor R5 are connected with one end of the operational amplifier B.
8. The power amplifier of claim 7, wherein: an inductance coil R6 is connected between the capacitors C3 and C5, the other end of the inductance coil R6 is connected with one end of the inductance coil R4, and a capacitor C4 is connected to the inductance coil R7 in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110496952.7A CN113381708A (en) | 2021-05-07 | 2021-05-07 | Power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110496952.7A CN113381708A (en) | 2021-05-07 | 2021-05-07 | Power amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN113381708A true CN113381708A (en) | 2021-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110496952.7A Pending CN113381708A (en) | 2021-05-07 | 2021-05-07 | Power amplifier |
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| Country | Link |
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| CN (1) | CN113381708A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB860725A (en) * | 1958-07-11 | 1961-02-08 | Evershed Vignoles Ltd | Improvements relating to direct current amplifiers employing transistors |
| CN101764576A (en) * | 2009-11-24 | 2010-06-30 | 上海贝岭股份有限公司 | Amplifier circuit with voltage-stabilizing power supply |
| CN104917472A (en) * | 2014-03-10 | 2015-09-16 | 中兴通讯股份有限公司 | Power amplifier circuit, power amplification device and broadband matching method of power amplification device |
| US20190049532A1 (en) * | 2015-09-30 | 2019-02-14 | Koninkijke Phillips N.V. | Rf power amplifier for magnetic resonance imaging |
-
2021
- 2021-05-07 CN CN202110496952.7A patent/CN113381708A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB860725A (en) * | 1958-07-11 | 1961-02-08 | Evershed Vignoles Ltd | Improvements relating to direct current amplifiers employing transistors |
| CN101764576A (en) * | 2009-11-24 | 2010-06-30 | 上海贝岭股份有限公司 | Amplifier circuit with voltage-stabilizing power supply |
| CN104917472A (en) * | 2014-03-10 | 2015-09-16 | 中兴通讯股份有限公司 | Power amplifier circuit, power amplification device and broadband matching method of power amplification device |
| US20190049532A1 (en) * | 2015-09-30 | 2019-02-14 | Koninkijke Phillips N.V. | Rf power amplifier for magnetic resonance imaging |
Non-Patent Citations (4)
| Title |
|---|
| 景兴红: "《模拟电子技术及应用》", 31 August 2016, 西安交通大学出版社 * |
| 李佳等: "《电子技术实验指导》", 31 January 2019, 西安电子科技大学出版社 * |
| 范红刚: "《51单片机自学笔记》", 31 March 2019, 北京航空航天大学出版社 * |
| 郜志峰: "《电路和电子技术》", 31 May 2019, 北京理工大学出版社 * |
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Application publication date: 20210910 |