CN211880611U - Power amplifier with electromagnetic interference prevention function - Google Patents
Power amplifier with electromagnetic interference prevention function Download PDFInfo
- Publication number
- CN211880611U CN211880611U CN201822120844.6U CN201822120844U CN211880611U CN 211880611 U CN211880611 U CN 211880611U CN 201822120844 U CN201822120844 U CN 201822120844U CN 211880611 U CN211880611 U CN 211880611U
- Authority
- CN
- China
- Prior art keywords
- circuit
- power amplifier
- class
- capacitor
- signal input
- 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.)
- Active
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model discloses a power amplifier with electromagnetic interference resistance function, including supply circuit, D class power amplifier circuit, equalizer circuit, signal input filter circuit, power amplifier output filter circuit, turn-off control circuit, first electromagnetism anti-jamming circuit and second electromagnetism anti-jamming circuit, equalizer circuit's output with signal input filter circuit's input is connected, signal input filter circuit's output with D class power amplifier circuit's input is connected, D class power amplifier circuit's output passes through power amplifier output filter circuit with turn-off control circuit connects, first electromagnetism anti-jamming circuit connect in between signal input filter circuit and the D class power amplifier circuit, second electromagnetism anti-jamming circuit connect in D class power amplifier circuit with between the output filter circuit. The utility model discloses can reduce quiescent current consumption and consumption, improve dynamic characteristic and improve the suppression effect to electromagnetic interference.
Description
Technical Field
The utility model belongs to the technical field of the power amplifier, especially, relate to a power amplifier with electromagnetic interference resistance function.
Background
A power amplifier, also called a power amplifier or a loudspeaker, is the most basic device widely used in a sound system. The power amplifier is mainly used for amplifying a weak signal output by a sound source or a pre-amplifier so as to drive the sound equipment to produce sound. The quality of the power amplifier directly affects the quality of the sound system. The development history of the power amplifier is divided into four stages of an electronic tube, a transistor, an integrated circuit and a field effect tube. At present, in the working process of a power amplifier in a sound system, the power amplifier often has high quiescent current consumption and power consumption, the dynamic characteristic is poor due to the analog amplification and feedback control, and in addition, the suppression effect on electromagnetic interference is poor during working.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a power amplifier with electromagnetic interference resistance function can reduce quiescent current consumption and consumption, improves dynamic characteristic and improves the suppression effect to electromagnetic interference.
The embodiment of the utility model provides a power amplifier with electromagnetic interference resistance function, including the shell, be fixed in circuit board in the shell and inlay the speaker in the shell, the speaker includes sound production subassembly and the drive assembly who connects with the sound production subassembly, the power amplifier includes power supply circuit, D class power amplifier circuit, equalizer circuit, signal input filter circuit, power amplifier output filter circuit, turn-off control circuit, first electromagnetism anti-jamming circuit and the second electromagnetism anti-jamming circuit of installing on the circuit board, wherein, power supply circuit respectively with D class power amplifier circuit, equalizer circuit, signal input filter circuit, power amplifier output filter circuit, turn-off control circuit, first electromagnetism anti-jamming circuit and second electromagnetism anti-jamming circuit connect, equalizer circuit's output with signal input filter circuit's input is connected, the output of signal input filter circuit with D class power amplifier circuit's input is connected, D class power amplifier circuit's output passes through power amplifier output filter circuit with turn-off control circuit connects, turn-off control circuit with drive assembly connects, first electromagnetism anti-jamming circuit connect in between signal input filter circuit and the D class power amplifier circuit, second electromagnetism anti-jamming circuit connect in D class power amplifier circuit with between the power amplifier output filter circuit.
Furthermore, the first electromagnetic anti-interference circuit comprises a first resistor, a first capacitor, a second capacitor and a first inductor connected with the output end of the signal input filter circuit, one end of the first inductor is connected with one end of the first capacitor and one end of the second capacitor which are connected in parallel, the other end of the first inductor is connected with the first resistor, the other end of the first capacitor and the second capacitor which are connected in parallel and the first resistor are connected with the class D power amplifier circuit.
Furthermore, the second electromagnetic anti-interference circuit comprises a third capacitor and a fourth capacitor connected with the third capacitor in parallel, one end of the fourth capacitor is connected with the class D power amplifier circuit through a second inductor, and the other end of the fourth capacitor is connected with the class D power amplifier circuit through a second resistor.
Furthermore, the drive assembly comprises a permanent magnet and a voice coil, wherein one end of the permanent magnet is connected with the turn-off control circuit, and the other end of the permanent magnet is coupled with the voice coil.
Further, the sounding subassembly is including setting up in the diaphragm in the shell, the voice coil loudspeaker voice coil with the diaphragm is connected.
Furthermore, the class-D power amplifier circuit comprises a power amplifier chip.
To sum up, the embodiment of the utility model provides a pair of power amplifier with electromagnetic interference resistance function, including supply circuit, D class power amplifier circuit, equalizer circuit, signal input filter circuit, power amplifier output filter circuit, turn-off control circuit, first electromagnetism anti-jamming circuit and second electromagnetism anti-jamming circuit, wherein, D class power amplifier circuit can reduce quiescent current consumption and improve dynamic characteristic. In addition, equalizer circuit's output with signal input filter circuit's input is connected, signal input filter circuit's output with class D power amplifier circuit's input is connected, class D power amplifier circuit's output passes through power amplifier output filter circuit with turn-off control circuit connects, turn-off control circuit with drive assembly connects, first electromagnetism anti jamming circuit connect in between signal input filter circuit and the class D power amplifier circuit, second electromagnetism anti jamming circuit connect in class D power amplifier circuit with between the power amplifier output filter circuit, owing to increased first electromagnetism anti jamming circuit and second electromagnetism anti jamming circuit can improve power amplifier working process to electromagnetic interference's suppression effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to these drawings without inventive efforts.
Fig. 1 is a circuit connection block diagram of a power amplifier with electromagnetic interference prevention function according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a first electromagnetic interference rejection circuit according to an embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of a second electromagnetic interference rejection circuit according to an embodiment of the present invention.
Icon:
a power amplifier 100; a power supply circuit 101; a class D power amplifier circuit 102; an equalization circuit 103;
a signal input filter circuit 104; a power amplifier output filter circuit 105; turn off control circuit 106;
a first electromagnetic interference rejection circuit 107; a second electromagnetic immunity circuit 108; a first capacitance C1;
a first capacitance C2; a third capacitance C3; a fourth capacitance C4; a first inductance L1;
a second inductance L2; a first resistor R1; and a second resistor R2.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
As shown in fig. 1, an embodiment of the present invention provides an anti-electromagnetic interference power amplifier 100, which includes a housing, a circuit board and a speaker. The loudspeaker is characterized in that the shell is internally provided with a containing space, the circuit board is fixedly arranged in the containing space of the shell, and the loudspeaker is embedded in the shell.
In this embodiment, the power amplifier 100 mainly includes a power supply circuit 101, a class D power amplifier circuit 102, an equalizing circuit 103, a signal input filter circuit 104, a power amplifier output filter circuit 105, a turn-off control circuit 106, a first electromagnetic anti-jamming circuit 107, and a second electromagnetic anti-jamming circuit 108, which are mounted on the circuit board. The power supply circuit 101 is respectively connected to the class D power amplifier circuit 102, the equalizer circuit 103, the signal input filter circuit 104, the power amplifier output filter circuit 105, the turn-off control circuit 106, the first electromagnetic anti-jamming circuit 107, and the second electromagnetic anti-jamming circuit 108 to provide a working voltage. Specifically, the output end of the equalizing circuit 103 is connected with the input end of the signal input filter circuit 104, the output end of the signal input filter circuit 104 is connected with the input end of the class D power amplifier circuit 102, the output end of the class D power amplifier circuit 102 is connected with the turn-off control circuit 106 through the power amplifier output filter circuit 105, the turn-off control circuit 106 is connected with the driving component, the first electromagnetic anti-jamming circuit 107 is connected between the signal input filter circuit 104 and the class D power amplifier circuit 102, and the second electromagnetic anti-jamming circuit 108 is connected between the class D power amplifier circuit 102 and the power amplifier output filter circuit 105.
Preferably, the class D power amplifier circuit 102 includes a power amplifier chip, a peripheral circuit, and the like. In addition, the loudspeaker comprises a sound production assembly and a driving assembly connected with the sound production assembly. The driving assembly may include a permanent magnet and a voice coil, one end of the permanent magnet is connected to the turn-off control circuit 106, and the other end is coupled to the voice coil. The sounding subassembly including set up in the vibrating diaphragm in the shell, the voice coil loudspeaker voice coil with the vibrating diaphragm is connected. In this way, the speaker can generate corresponding sound or the like by the shutdown control circuit 106.
The class D power amplifier circuit 102 can reduce static current consumption and power consumption and improve dynamic characteristics. The first electromagnetic interference rejection circuit 107 and the second electromagnetic interference rejection circuit 108 can improve the effect of suppressing electromagnetic interference in the working process of the power amplifier 100.
Specifically, as shown in fig. 2, the first electromagnetic interference rejection circuit 107 includes a first resistor R1, a first capacitor C1, a second capacitor C2, and a first inductor L1 connected to the output end of the signal input filter circuit 104, one end of the first inductor L1 is connected to one end of the first capacitor C1 connected in parallel to the second capacitor C2, and the other end of the first inductor L1 is connected to the first resistor R1, and the other end of the first capacitor C1 connected in parallel to the second capacitor C2 and the first resistor R1 are both connected to the class D power amplifier circuit 102.
In addition, as shown in fig. 3, the second electromagnetic interference rejection circuit 108 includes a third capacitor C3 and a fourth capacitor C4 connected in parallel to the third capacitor C3, one end of the fourth capacitor C4 is connected to the class D power amplifier circuit 102 through a second inductor L2, and the other end is connected to the class D power amplifier circuit 102 through a second resistor R2.
To sum up, the embodiment of the utility model provides a pair of power amplifier 100 with electromagnetic interference resistance function, including supply circuit 101, D class power amplifier circuit 102, equalizer circuit 103, signal input filter circuit 104, power amplifier output filter circuit 105, turn-off control circuit 106, first electromagnetism anti-jamming circuit 107 and second electromagnetism anti-jamming circuit 108, wherein, D class power amplifier circuit 102 can reduce quiescent current consumption and improve dynamic characteristic. In addition, the output of equalizer circuit 103 with signal input filter circuit 104's input is connected, signal input filter circuit 104's output with class D power amplifier circuit 102's input is connected, class D power amplifier circuit 102's output passes through power amplifier output filter circuit 105 with turn-off control circuit 106 is connected, turn-off control circuit 106 with drive assembly connects, first electromagnetism anti-jamming circuit 107 connect in between signal input filter circuit 104 and class D power amplifier circuit 102, second electromagnetism anti-jamming circuit 108 connect in class D power amplifier circuit 102 with between the power amplifier output filter circuit 105, owing to increased first electromagnetism anti-jamming circuit 107 and second electromagnetism anti-jamming circuit 108, can improve power amplifier 100 working process to electromagnetic interference's suppression effect.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A power amplifier with anti-electromagnetic interference function, characterized in that, include the shell, be fixed in circuit board in the shell and inlay in the speaker in the shell, the speaker includes sound production subassembly and the drive assembly who connects with the sound production subassembly, the power amplifier is including installing power supply circuit, D class power amplifier circuit, equalizer circuit, signal input filter circuit, power amplifier output filter circuit, shutoff control circuit, first electromagnetism anti-jamming circuit and the second electromagnetism anti-jamming circuit on the circuit board, wherein, power supply circuit respectively with D class power amplifier circuit, equalizer circuit, signal input filter circuit, power amplifier output filter circuit, shutoff control circuit, first electromagnetism anti-jamming circuit and second electromagnetism anti-jamming circuit connect, equalizer circuit's output with signal input filter circuit's input is connected, the output of signal input filter circuit with D class power amplifier circuit's input is connected, D class power amplifier circuit's output passes through power amplifier output filter circuit with turn-off control circuit connects, turn-off control circuit with drive assembly connects, first electromagnetism anti-jamming circuit connect in between signal input filter circuit and the D class power amplifier circuit, second electromagnetism anti-jamming circuit connect in D class power amplifier circuit with between the power amplifier output filter circuit.
2. The power amplifier with emi shielding function of claim 1, wherein the first emi shielding circuit includes a first resistor, a first capacitor, a second capacitor and a first inductor connected to the output terminal of the signal input filter circuit, one end of the first inductor is connected to one end of the first capacitor and the second capacitor connected in parallel, the other end of the first inductor is connected to the first resistor, the other end of the first capacitor and the second capacitor connected in parallel and the first resistor are connected to the class D power amplifier circuit.
3. The power amplifier with electromagnetic interference prevention function of claim 1, wherein the second electromagnetic anti-interference circuit comprises a third capacitor and a fourth capacitor connected in parallel with the third capacitor, one end of the fourth capacitor is connected to the class D power amplifier circuit through a second inductor, and the other end of the fourth capacitor is connected to the class D power amplifier circuit through a second resistor.
4. The power amplifier of claim 1, wherein the driving assembly comprises a permanent magnet and a voice coil, one end of the permanent magnet is connected to the turn-off control circuit, and the other end of the permanent magnet is coupled to the voice coil.
5. The power amplifier with emi shielding function of claim 4, wherein the sound generating component includes a diaphragm disposed in the housing, and the voice coil is connected to the diaphragm.
6. The power amplifier with emi shielding function of any one of claims 1 to 5, wherein said class D power amplifier circuit includes a power amplifier chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822120844.6U CN211880611U (en) | 2018-12-17 | 2018-12-17 | Power amplifier with electromagnetic interference prevention function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822120844.6U CN211880611U (en) | 2018-12-17 | 2018-12-17 | Power amplifier with electromagnetic interference prevention function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211880611U true CN211880611U (en) | 2020-11-06 |
Family
ID=73240024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822120844.6U Active CN211880611U (en) | 2018-12-17 | 2018-12-17 | Power amplifier with electromagnetic interference prevention function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211880611U (en) |
-
2018
- 2018-12-17 CN CN201822120844.6U patent/CN211880611U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101534467B (en) | Condenser microphone | |
| WO2008083148A2 (en) | Passive headphone equalizing | |
| CN104685904B (en) | Electret Condencer Microphone and its impedance transformer | |
| CN102118668B (en) | Loudspeaker system and loudspeaker driving circuit | |
| CN211880611U (en) | Power amplifier with electromagnetic interference prevention function | |
| CN105047212A (en) | Audio play circuit and player | |
| CN207652684U (en) | A kind of graphene coil-moving speaker | |
| CN210958769U (en) | Electronic equipment | |
| CN203563186U (en) | Noise reduction circuit and voice audio driving circuit provided with same | |
| CN207780781U (en) | Device and electronic equipment applied to translator | |
| CN202634678U (en) | Noise-reduction circuit | |
| CN205454080U (en) | Vibration sound -generating device's drive circuit , vibration sound -generating device and electronic equipment | |
| CN204578484U (en) | A kind of amplifying circuit strengthened for electric capacity miaow head signal | |
| CN202059574U (en) | High sensitivity sound detector prepared by operational amplifiers | |
| CN205005264U (en) | Audio power amplifier integrated circuit | |
| CN218006515U (en) | Anti-noise circuit, electret microphone anti-noise circuit and electret microphone equipment | |
| CN204859493U (en) | Adopt head circuit of discrete component equipment | |
| CN219164725U (en) | Terminal equipment | |
| CN210670000U (en) | Audio power amplifying circuit with pure tone quality | |
| CN209105406U (en) | A kind of speaker | |
| CN204794911U (en) | Little signal amplification circuit system of analog audio | |
| CN104980847A (en) | Earphone circuit assembled by discrete components | |
| CN211792015U (en) | Audio playing circuit and intercom device | |
| CN107613430A (en) | A kind of speaker circuit and mobile terminal | |
| CN103929703B (en) | Body-conduction microphone |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |