CN216356471U - Power supply conversion circuit for high noise suppression audio conversion controller - Google Patents
Power supply conversion circuit for high noise suppression audio conversion controller Download PDFInfo
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Abstract
The utility model discloses a power supply conversion circuit for a high-noise-rejection audio conversion controller, which is used for providing a 15V power supply and comprises an overvoltage protection module, a first-stage common-mode filtering module, a voltage stabilizing module, a second-stage LC filtering module, a DC/DC voltage reducing module, a third-stage differential-mode filtering module and a linear three-terminal voltage stabilizing module which are sequentially connected. The utility model can provide stable 15V working voltage for the audio transmission circuit, effectively filter common mode and differential mode interference generated during internal conversion of the power circuit, and inhibit noise signals such as electromagnetic interference and the like brought by the external environment, can provide stable and relatively pure power supply for audio products, and improves the overall performance of the audio products.
Description
Technical Field
The utility model belongs to the technical field of noise suppression, and relates to a power supply conversion circuit for a high-noise-suppression audio conversion controller.
Background
With the rapid development of the electronic industry, audio/video communication products are becoming more popular in daily life, for example: mobile phones, call stations, monitors, and the like. Generally, these products need to use different voltage sources, such as 3.3V, 5V, 12V, etc., to provide operating voltages for their internal circuit modules. The utility model relates to a high noise suppression audio conversion controller, which has an operating voltage of 12V, but common external power supplies are more than 220V and 28V, so a specific power conversion circuit needs to be designed to convert the power supply into a 15V power supply required by a product.
The existing power conversion circuit is mostly of a general conversion type, and the interference of noise to a product is not considered, so that a noise suppression module is often lacked during design, but the audio communication equipment is extremely sensitive to noise signals, even if the power circuit generates very tiny interference signals, the noise signals are amplified and output to be obvious noise through the audio product, and the listening experience of a user is influenced.
The output part of the existing power supply conversion circuit generally adopts a series voltage stabilization mode, and oscillation is easily generated, so that the converted output voltage has certain fluctuation, and the signal amplification module of an audio product is influenced by the voltage fluctuation, so that the volume of receiving audio at a reception end is unstable, and the user experience is influenced.
Therefore, it is necessary to design a power conversion circuit having a noise suppression function and capable of strictly stabilizing an output voltage to solve the technical problems in the above-mentioned scenarios.
SUMMERY OF THE UTILITY MODEL
It is therefore an objective of the claimed invention to provide a power conversion circuit for a high noise rejection audio conversion controller.
In order to achieve the purpose, the technical scheme of the utility model is realized as follows:
the embodiment of the utility model provides a power supply conversion circuit for a high-noise rejection audio conversion controller, which is used for providing a 15V power supply and comprises an overvoltage protection module, a first-stage common mode filtering module, a voltage stabilizing module, a second-stage LC filtering module, a DC/DC voltage reducing module, a third-stage differential mode filtering module and a linear three-terminal voltage stabilizing module which are sequentially connected.
In the above scheme, the overvoltage protection module includes a direct-insert self-recovery fuse FSZ1 and a piezoresistor RV1, the left end of the direct-insert self-recovery fuse FSZ1 is connected with a 28V input power supply, the right end is connected with the left end of the piezoresistor RV1, the right end of the piezoresistor RV1 is connected with a 28VGND, and the two ends of the piezoresistor RV1 are further connected with the first-stage common mode filter module.
In the above scheme, the first-stage common mode filtering module includes a common mode inductor L3, a first capacitor CS5, a second capacitor CS1, a third capacitor CS6, and a fourth capacitor CS17, pins 2 and 3 of the common mode inductor L3 are respectively connected to two ends of a first capacitor CS5, pins 1 and 4 are respectively connected to two ends of a second capacitor CS1, one end of the second capacitor CS1 is grounded through a third capacitor CS6, the other end of the second capacitor CS17 is grounded, and the second capacitor CS1 is further connected to the voltage stabilizing module.
In the above scheme, the voltage stabilizing module includes a schottky diode D1 and a fifth capacitor CS9, an anode of the schottky diode D1 is connected to a 1 st pin of a common mode inductor L3 of the first-stage common mode filter module, a cathode of the schottky diode D1 is connected to one end of the fifth capacitor CS9, another end of the fifth capacitor CS9 is connected to a 4 th pin of a common mode inductor L3, the schottky diode D1 and the fifth capacitor CS9 are combined to form a charge and discharge loop, and two ends of the fifth capacitor CS9 are further connected to the second-stage LC filter module.
In the above scheme, the second stage LC filter module includes a first power inductor L1, a second power inductor L4, a sixth capacitor CS10, a seventh capacitor CS11, an eighth capacitor CS12, and a ninth capacitor CS 3; the input ends of the first power inductor L1 and the second power inductor L4 are sequentially connected in parallel with a sixth capacitor CS10 and a seventh capacitor CS11, the output ends are sequentially connected in parallel with an eighth capacitor CS12 and a ninth capacitor CS3, two ends of the sixth capacitor CS10 are connected with two ends of a fifth capacitor CS9 of the voltage stabilizing module, two ends of the ninth capacitor CS3 are connected with the DC/DC voltage reducing module, two ends of the ninth capacitor CS3 are connected with two ends of the fifth capacitor CS9, and two ends of the ninth capacitor CS3 are further connected with the DC/DC voltage reducing module.
In the above scheme, the DC/DC voltage-reducing module includes a TVS diode D2, a DC/DC voltage-reducing chip U1, and a tenth capacitor CS13, where pins 1 and 4 of the DC/DC voltage-reducing chip U1 are connected to two ends of the TVS diode D2, pins 2 and 3 are connected to two ends of the sixth capacitor CS10, the TVS diode D2 is connected to two ends of the ninth capacitor CS3, and two ends of the tenth capacitor CS13 are further connected to the third stage differential mode filter module.
In the above scheme, the third-stage differential mode filtering module includes a first magnetic bead B1, a second magnetic bead B2, an eleventh capacitor CS14, a twelfth capacitor CS2, a thirteenth capacitor CS15, and a fourteenth capacitor CS16, where input ends of the first magnetic bead B1 and the second magnetic bead B2 are sequentially connected in parallel to an eleventh capacitor CS14 and a twelfth capacitor CS2, an output end of the first magnetic bead B1 and the second magnetic bead B2 is sequentially connected in parallel to a thirteenth capacitor CS15 and a fourteenth capacitor CS16, two ends of the eleventh capacitor CS14 are connected to two ends of a tenth capacitor CS13, and two ends of the fourteenth capacitor CS16 are further connected to the linear three-terminal voltage stabilizing module.
In the above scheme, the linear three-terminal voltage stabilizing module includes a linear three-terminal voltage regulator U3, a fifteenth capacitor CS4, and a sixteenth capacitor CS8, a 1 st pin and a 4 th pin of the linear three-terminal voltage regulator U3 are connected to two ends of the fifteenth capacitor CS4, a3 rd pin and a 4 th pin are connected to two ends of the sixteenth capacitor CS8, two ends of the fifteenth capacitor CS4 are connected to two ends of the fourteenth capacitor CS16, one end of the sixteenth capacitor CS8 outputs a 15V power supply, and the other end is grounded.
Compared with the prior art, the power supply circuit can provide stable 15V working voltage for the audio transmission circuit, effectively filters common mode and differential mode interference generated during internal conversion of the power supply circuit, inhibits noise signals such as electromagnetic interference and the like brought by the external environment, can provide a stable and relatively pure power supply for an audio product, and improves the overall performance of the audio product.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiment(s) of the utility model and together with the description serve to explain the utility model without limiting the utility model. In the drawings:
fig. 1 is a circuit diagram of a power conversion circuit for a high noise rejection audio conversion controller according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, the terms describing the positional relationships in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, article, or apparatus that comprises the element.
The embodiment of the present invention provides a power conversion circuit for a high noise rejection audio conversion controller, as shown in fig. 1, the power conversion circuit includes an overvoltage protection module 110, a first-stage common mode filtering module 120, a voltage stabilization module 130, a second-stage LC filtering module 140, a DC/DC voltage reduction module 150, a third-stage differential mode filtering module 160, and a linear three-terminal voltage stabilization module 170, which are connected in sequence.
The overvoltage protection module 110 comprises a direct-insert self-recovery fuse FSZ1 and a piezoresistor RV1, the left end of the direct-insert self-recovery fuse FSZ1 is connected with a 28V input power supply, the right end of the direct-insert self-recovery fuse FSZ is connected with the left end of the piezoresistor RV1, the right end of the piezoresistor RV1 is connected with a 28VGND, two ends of the piezoresistor RV1 are further connected with the first-stage common mode filter module 120, the direct-insert self-recovery fuse FSZ1 and the piezoresistor RV1 form an input power supply overvoltage protection effect, and an inductive switch inhibits or other quick electrical transient events, so that the electromagnetic compatibility of the circuit is improved.
The first-stage common mode filtering module 120 is configured to consume noise energy in the circuit conversion circuit and filter out a common mode interference signal, and includes a common mode inductor L3, a first capacitor CS5, a second capacitor CS1, a third capacitor CS6, and a fourth capacitor CS17, pins 2 and 3 of the common mode inductor L3 are respectively connected to two ends of a first capacitor CS5, pins 1 and 4 are respectively connected to two ends of a second capacitor CS1, one end of the second capacitor CS1 is grounded through a third capacitor CS6, the other end of the second capacitor CS1 is grounded through a fourth capacitor CS17, and the second capacitor CS1 is further connected to the voltage stabilization module 130.
The voltage stabilizing module 130 includes a schottky diode D1 and a fifth capacitor CS9, an anode of the schottky diode D1 is connected to a 1 st pin of a common mode inductor L3 of the first stage common mode filter module 120, a cathode of the schottky diode D1 is connected to one end of the fifth capacitor CS9, the other end of the fifth capacitor CS9 is connected to a 4 th pin of a common mode inductor L3, the schottky diode D1 and the fifth capacitor CS9 are combined to form a charge and discharge loop, and two ends of the fifth capacitor CS9 are further connected to the second stage LC filter module 140.
The schottky diode D1 and the fifth capacitor CS9 form a charge-discharge circuit, which stabilizes the input voltage.
The second stage LC filter module 140 includes a first power inductor L1, a second power inductor L4, a sixth capacitor CS10, a seventh capacitor CS11, an eighth capacitor CS12, and a ninth capacitor CS 3; the input ends of the first power inductor L1 and the second power inductor L4 are sequentially connected in parallel with a sixth capacitor CS10 and a seventh capacitor CS11, the output ends are sequentially connected in parallel with an eighth capacitor CS12 and a ninth capacitor CS3, two ends of the sixth capacitor CS10 are connected with two ends of a fifth capacitor CS9 of the voltage stabilizing module 130, two ends of the ninth capacitor CS3 are connected with the DC/DC voltage reducing module 150, two ends of the ninth capacitor CS3 are connected with two ends of the fifth capacitor CS9, and two ends of the ninth capacitor CS3 are further connected with the DC/DC voltage reducing module 150.
The LC tuning loop formed by the sixth capacitor CS10 and the ninth capacitor CS13 is used for filtering low-frequency noise in the power conversion circuit, the LC tuning loop formed by the seventh capacitor CS11 and the eighth capacitor CS12 is used for filtering high-frequency noise in the power conversion circuit,
the DC/DC voltage-reducing module 150 includes a TVS diode D2, a DC/DC voltage-reducing chip U1, and a tenth capacitor CS13, wherein pins 1 and 4 of the DC/DC voltage-reducing chip U1 are connected to two ends of the TVS diode D2, pins 2 and 3 are connected to two ends of the sixth capacitor CS10, the TVS diode D2 is connected to two ends of the ninth capacitor CS3, and two ends of the tenth capacitor CS13 are further connected to the third stage differential mode filtering module 160.
The TVS diode D2 is used for preventing surge voltage impact and inhibiting electromagnetic wave interference, the DC/DC voltage reduction chip U1 is used for converting input 28V voltage into 15V output voltage, the tenth capacitor CS13 is used for stabilizing the output voltage, the three devices are combined to form stable voltage reduction, the DC/DC voltage reduction chip U1 can be selected from a model H28S15A3N, the price advantage is obvious, and the output voltage is stable.
The third-stage differential mode filtering module 160 is configured to consume noise energy in the circuit conversion circuit and filter differential mode interference signals, and includes a first magnetic bead B1, a second magnetic bead B2, an eleventh capacitor CS14, a twelfth capacitor CS2, a thirteenth capacitor CS15, and a fourteenth capacitor CS16, where input ends of the first magnetic bead B1 and the second magnetic bead B2 are sequentially connected in parallel to an eleventh capacitor CS14 and a twelfth capacitor CS2, output ends of the first magnetic bead B1 and the second magnetic bead B2 are sequentially connected in parallel to a thirteenth capacitor CS15 and a fourteenth capacitor CS16, two ends of the eleventh capacitor CS14 are connected to two ends of the tenth capacitor CS13, and two ends of the fourteenth capacitor CS16 are further connected to the linear three-terminal voltage stabilizing module 170.
The linear three-terminal voltage stabilizing module 170 is used for eliminating interference caused by power supply ripples and stabilizing output voltage, and includes a linear three-terminal voltage regulator U3, a fifteenth capacitor CS4 and a sixteenth capacitor CS8, wherein a 1 st pin and a 4 th pin of the linear three-terminal voltage regulator U3 are connected to two ends of the fifteenth capacitor CS4, a3 rd pin and a 4 th pin of the linear three-terminal voltage regulator U3 are connected to two ends of a sixteenth capacitor CS8, two ends of the fifteenth capacitor CS4 are connected to two ends of the fourteenth capacitor CS16, one end of the sixteenth capacitor CS8 outputs a 15V power supply, and the other end is grounded.
The power supply conversion circuit can provide stable 15V working voltage for audio products.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (8)
1. A power supply conversion circuit for a high-noise-rejection audio conversion controller is used for providing a 15V power supply and is characterized by comprising an overvoltage protection module, a first-stage common-mode filtering module, a voltage stabilizing module, a second-stage LC filtering module, a DC/DC voltage reducing module, a third-stage differential-mode filtering module and a linear three-terminal voltage stabilizing module which are sequentially connected.
2. The power conversion circuit for the high noise suppression audio conversion controller according to claim 1, wherein the overvoltage protection module comprises an in-line self-recovery fuse FSZ1 and a voltage dependent resistor RV1, the left end of the in-line self-recovery fuse FSZ1 is connected to a 28V input power supply, the right end of the in-line self-recovery fuse FSZ is connected to the left end of a voltage dependent resistor RV1, the right end of the voltage dependent resistor RV1 is connected to a 28VGND, and two ends of the voltage dependent resistor RV1 are further connected to the first-stage common mode filter module.
3. The power conversion circuit for the high noise rejection audio conversion controller according to claim 1 or 2, wherein the first stage common mode filter module includes a common mode inductor L3, a first capacitor CS5, a second capacitor CS1, a third capacitor CS6, and a fourth capacitor CS17, pins 2 and 3 of the common mode inductor L3 are respectively connected to two ends of a first capacitor CS5, pins 1 and 4 are respectively connected to two ends of a second capacitor CS1, one end of the second capacitor CS1 is connected to the ground through a third capacitor CS6, the other end is connected to the ground through a fourth capacitor CS17, and the second capacitor CS1 is further connected to the voltage stabilizing module.
4. The power conversion circuit for the high noise rejection audio conversion controller according to claim 3, wherein the voltage stabilizing module comprises a schottky diode D1 and a fifth capacitor CS9, an anode of the schottky diode D1 is connected to the 1 st pin of the common-mode inductor L3 of the first stage of common-mode filter module, a cathode of the schottky diode D3526 is connected to one end of the fifth capacitor CS9, the other end of the fifth capacitor CS9 is connected to the 4 th pin of the common-mode inductor L3, the schottky diode D1 and the fifth capacitor CS9 form a charge-discharge circuit in combination, and two ends of the fifth capacitor CS9 are further connected to the second stage of LC filter module.
5. The power conversion circuit for a high noise rejection audio conversion controller of claim 4, wherein said second stage LC filter module comprises a first power inductor L1, a second power inductor L4, a sixth capacitor CS10, a seventh capacitor CS11, an eighth capacitor CS12, a ninth capacitor CS 3; the input ends of the first power inductor L1 and the second power inductor L4 are sequentially connected in parallel with a sixth capacitor CS10 and a seventh capacitor CS11, the output ends are sequentially connected in parallel with an eighth capacitor CS12 and a ninth capacitor CS3, two ends of the sixth capacitor CS10 are connected with two ends of a fifth capacitor CS9 of the voltage stabilizing module, two ends of the ninth capacitor CS3 are connected with the DC/DC voltage reducing module, two ends of the ninth capacitor CS3 are connected with two ends of the fifth capacitor CS9, and two ends of the ninth capacitor CS3 are further connected with the DC/DC voltage reducing module 150.
6. The power conversion circuit for the audio conversion controller with high noise suppression according to claim 5, wherein the DC/DC voltage reduction module comprises a TVS diode D2, a DC/DC voltage reduction chip U1 and a tenth capacitor CS13, pins 1 and 4 of the DC/DC voltage reduction chip U1 are connected to two ends of the TVS diode D2, pins 2 and 3 are connected to two ends of a sixth capacitor CS10, the TVS diode D2 is connected to two ends of a ninth capacitor CS3, and two ends of the tenth capacitor CS13 are further connected to a third stage differential mode filter module.
7. The power conversion circuit for the high noise suppression audio conversion controller according to claim 6, wherein the third stage differential mode filter module includes a first magnetic bead B1, a second magnetic bead B2, an eleventh capacitor CS14, a twelfth capacitor CS2, a thirteenth capacitor CS15, and a fourteenth capacitor CS16, input ends of the first magnetic bead B1 and the second magnetic bead B2 are sequentially connected in parallel with an eleventh capacitor CS14 and a twelfth capacitor CS2, output ends of the first magnetic bead B1 and the second magnetic bead B2 are sequentially connected in parallel with a thirteenth capacitor CS15 and a fourteenth capacitor CS16, two ends of the eleventh capacitor CS14 are connected with two ends of a tenth capacitor CS13, and two ends of the fourteenth capacitor CS16 are further connected with a linear three-terminal voltage stabilization module.
8. The power conversion circuit of claim 7, wherein the linear three-terminal regulator module comprises a linear three-terminal regulator U3, a fifteenth capacitor CS4, and a sixteenth capacitor CS8, wherein pins 1 and 4 of the linear three-terminal regulator U3 are connected to two ends of the fifteenth capacitor CS4, pins 3 and 4 are connected to two ends of a sixteenth capacitor CS8, two ends of the fifteenth capacitor CS4 are connected to two ends of the fourteenth capacitor CS16, one end of the sixteenth capacitor CS8 outputs a 15V power supply, and the other end is grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122655961.4U CN216356471U (en) | 2021-11-02 | 2021-11-02 | Power supply conversion circuit for high noise suppression audio conversion controller |
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| CN202122655961.4U CN216356471U (en) | 2021-11-02 | 2021-11-02 | Power supply conversion circuit for high noise suppression audio conversion controller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115833788A (en) * | 2022-11-29 | 2023-03-21 | 中船重工安谱（湖北）仪器有限公司 | Multi-order filter for ion mobility instrumentation |
| CN116800284A (en) * | 2023-07-18 | 2023-09-22 | 北京捷星电子科技有限公司 | Bluetooth multimedia radio |
-
2021
- 2021-11-02 CN CN202122655961.4U patent/CN216356471U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115833788A (en) * | 2022-11-29 | 2023-03-21 | 中船重工安谱（湖北）仪器有限公司 | Multi-order filter for ion mobility instrumentation |
| CN116800284A (en) * | 2023-07-18 | 2023-09-22 | 北京捷星电子科技有限公司 | Bluetooth multimedia radio |
| CN116800284B (en) * | 2023-07-18 | 2024-03-12 | 北京捷星电子科技有限公司 | Bluetooth multimedia radio |
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Effective date of registration: 20231204 Address after: 713702 Building 5-67, Jinghe Zhigu, Chongwen Town, Jinghe New City, Xixian New District, Xi'an City, Shaanxi Province, China Patentee after: Xi'an Yiming Information Technology Co.,Ltd. Address before: 710000 No. 7, Gaoxin 1st Road, Zhangba street, Xi'an, Shaanxi Patentee before: Xi'an saipute Information Technology Co.,Ltd. |
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