CN114138064A - Eliminating device for MLCC squeaking noise and notebook computer - Google Patents
Eliminating device for MLCC squeaking noise and notebook computer Download PDFInfo
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- CN114138064A CN114138064A CN202111274659.2A CN202111274659A CN114138064A CN 114138064 A CN114138064 A CN 114138064A CN 202111274659 A CN202111274659 A CN 202111274659A CN 114138064 A CN114138064 A CN 114138064A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
- 239000010410 layer Substances 0.000 claims abstract description 20
- 239000002344 surface layer Substances 0.000 claims abstract description 19
- 230000005684 electric field Effects 0.000 abstract description 13
- 230000008030 elimination Effects 0.000 abstract description 5
- 238000003379 elimination reaction Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 9
- 239000003990 capacitor Substances 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
- G06F1/1656—Details related to functional adaptations of the enclosure, e.g. to provide protection against EMI, shock, water, or to host detachable peripherals like a mouse or removable expansions units like PCMCIA cards, or to provide access to internal components for maintenance or to removable storage supports like CDs or DVDs, or to mechanically mount accessories
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Human Computer Interaction (AREA)
- Dc-Dc Converters (AREA)
Abstract
The application discloses a device for eliminating MLCC howling noise, which comprises: the power supply comprises a mainboard, wherein a power supply chip and a voltage conversion circuit connected with the power supply chip are arranged on the mainboard, and an even number of MLCCs with the same specification and arranged on the surface layer and the bottom layer of the mainboard in a mirror symmetry mode are arranged at the input end and the output end of the voltage conversion circuit. Because the input end and the output end of the voltage conversion circuit are respectively provided with an even number of MLCCs with the same specification and arranged on the surface layer and the bottom layer of the mainboard in a mirror symmetry mode, when an electric field acts on the MLCCs, the MLCCs arranged on the surface layer and the bottom layer of the mainboard generate the same deformation, and a group of mutually offset deformation forces are generated on the mainboard. Therefore, the elimination device provided by the application can eliminate the howling noise generated by the MLCC and the mainboard under the resonance condition. Correspondingly, the notebook computer provided by the application also has the beneficial effects.
Description
Technical Field
The invention relates to the technical field of computers, in particular to a device for eliminating MLCC howling noise and a notebook computer.
Background
At present, for the sake of cost and appearance, the capacitor on the motherboard of the notebook computer is generally selected as a MLCC (Multi-Layer Ceramic Capacitors), wherein the MLCC has an electrostrictive effect, that is, the MLCC generates a mechanical deformation along the direction of the electric field under the action of the electric field. Because the MLCC is fixed on the main board, the MLCC drives the main board to vibrate under the action of an electric field. If the mechanical deformation generated by the MLCC forms resonance with the main board and the vibration period is in the vibration range (20 Hz-20 KHz) which can be distinguished by human ears, squeaking noise is generated. This may seriously affect the user experience when using the notebook computer. At present, no effective solution exists for the above technical problems.
Disclosure of Invention
Accordingly, the present invention is directed to a device for eliminating howling noise of MLCC and a notebook computer, so as to eliminate the howling noise generated by the MLCC and the main board under the resonance condition. The specific scheme is as follows:
an apparatus for removing MLCC howling noise, comprising: the power supply comprises a main board, wherein a power supply chip and a voltage conversion circuit connected with the power supply chip are arranged on the main board, and an even number of MLCCs which have the same specification and are arranged on the surface layer and the bottom layer of the main board in a mirror symmetry mode are arranged at the input end and the output end of the voltage conversion circuit.
Preferably, the number of MLCCs at the input end and the output end of the voltage conversion circuit can be adjusted according to user-defined requirements.
Preferably, the power supply chip is Richtek RT 8129B.
Preferably, the voltage conversion circuit is a buck circuit.
Preferably, the buck circuit includes: the circuit comprises a first switching tube, a second switching tube and an inductor;
the control end of the first switch tube is connected with an HG pin of the power chip, the second end of the first switch is respectively connected with a PH pin of the power chip, the first end of the second switch tube and the first end of the inductor, the control end of the second switch tube is connected with an LG pin of the power chip, and the second end of the second switch tube is grounded;
correspondingly, the first end of the first switch tube is the input end of the buck circuit, and the second end of the inductor is the output end of the buck circuit.
Preferably, the first switch tube and the second switch tube are both NMOS tubes.
Correspondingly, the invention also discloses a notebook computer which comprises the device for eliminating the MLCC howling noise disclosed by the invention.
Therefore, in the invention, because the input end and the output end of the voltage conversion circuit are respectively provided with the even number of MLCCs which have the same specification and are arranged on the surface layer and the bottom layer of the mainboard in a mirror symmetry mode, when an electric field acts on the MLCCs, the MLCCs arranged on the surface layer and the bottom layer of the mainboard generate the same deformation, and a group of mutually offset deformation forces are generated on the mainboard. Therefore, the elimination device provided by the invention can avoid the resonance phenomenon formed by the MLCC and the main board under the action of the electric field, thereby eliminating the howling noise generated by the MLCC and the main board under the resonance condition. Correspondingly, the notebook computer provided by the invention also has the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a structural diagram of an apparatus for removing MLCC howling noise according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a MLCC undergoing mechanical deformation under the action of an electric field;
fig. 3 is a structural diagram of another apparatus for removing MLCC howling noise according to an embodiment of 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.
Referring to fig. 1, fig. 1 is a structural diagram of an apparatus for eliminating MLCC howling noise according to an embodiment of the present invention, where the apparatus includes: the power supply comprises a mainboard, wherein a power supply chip and a voltage conversion circuit connected with the power supply chip are arranged on the mainboard, and an even number of MLCCs with the same specification and arranged on the surface layer and the bottom layer of the mainboard in a mirror symmetry mode are arranged at the input end and the output end of the voltage conversion circuit.
In this embodiment, a device for eliminating howling noise of MLCC is provided, by which howling noise generated by MLCC and main board under resonance condition can be eliminated. Specifically, the eliminating device is provided with a main board, a power chip and a voltage conversion circuit are arranged on the main board, and an input end and an output end of the voltage conversion circuit are respectively provided with an even number of MLCCs which have the same specification and are arranged on the surface layer and the bottom layer of the main board in a mirror symmetry mode. That is, the input end of the voltage conversion circuit is provided with an even number of MLCCs which have the same specification and are arranged on the surface layer and the bottom layer of the mainboard in a mirror symmetry manner, and the output end of the voltage conversion circuit is provided with an even number of MLCCs which have the same specification and are arranged on the surface layer and the bottom layer of the mainboard in a mirror symmetry manner.
It should be noted that the number of the input terminals and the number of the output terminals MLCC of the voltage converting circuit may not be equal. Such as: 6 MLCCs can be arranged at the input end of the voltage conversion circuit, and 8 MLCCs can be arranged at the output end of the voltage conversion circuit; alternatively, 12 MLCCs are provided at the input terminal of the voltage conversion circuit, and 10 MLCCs are provided at the output terminal of the voltage conversion circuit, which is not particularly limited herein.
It can be understood that, in the embodiment, when an even number of MLCCs with the same specification at the input end or the output end of the voltage converting circuit are arranged on the surface layer and the bottom layer of the main board in a mirror symmetry manner, the MLCCs arranged on the surface layer and the bottom layer of the main board generate the same mechanical deformation under the action of the electric field. Under this action, a set of counteracting deformation forces is generated on the main plate.
Referring to fig. 2, fig. 2 is a schematic diagram of the MLCC generating mechanical deformation under the action of an electric field. The upper diagram of fig. 2 is a schematic diagram of arranging MLCCs on a main board, the middle diagram of fig. 2 is a schematic diagram of a single MLCC generating mechanical deformation under the action of an electric field, and the lower diagram of fig. 2 is a schematic diagram of two MLCCs arranged on the surface layer and the bottom layer of the main board in a mirror symmetry manner and generating a group of mutually offset deformation forces on the main board. Obviously, when an even number of MLCCs with the same specification and arranged on the surface layer and the bottom layer of the main board in a mirror image manner are arranged at the input end or the output end of the voltage conversion circuit, a set of deformation forces with the same magnitude and opposite action is generated by the MLCCs arranged on the surface layer of the main board and the MLCCs arranged on the bottom layer of the main board under the action of an electric field. In this case, a set of mutually offsetting deformation forces is generated on the main board, so that no matter the MLCC arranged at the input end or the MLCC arranged at the output end of the voltage conversion circuit can not form resonance with the main board, and the howling noise generated by the MLCC and the main board under the resonance action can be eliminated.
Compared with the prior art, the howling noise eliminating device provided by the embodiment can avoid the howling noise generated by the MLCC and the mainboard under the resonance action only by adjusting the placement position of the MLCC on the basis of the existing MLCC arrangement structure. Therefore, when the user uses the notebook computer, the notebook computer can be ensured to be in a relatively quiet environment, and the use experience of the user can be further improved.
It can be seen that, in the embodiment, since even numbers of MLCCs with the same specification and mirror-symmetrically arranged on the surface layer and the bottom layer of the motherboard are arranged at the input end and the output end of the voltage conversion circuit, when an electric field acts on the MLCCs, the MLCCs arranged on the surface layer and the bottom layer of the motherboard generate the same deformation, and generate a set of mutually offset deformation forces on the motherboard. Therefore, the elimination device provided by the embodiment can avoid the resonance phenomenon formed by the MLCC and the main board under the action of the electric field, thereby eliminating the howling noise generated by the MLCC and the main board under the resonance condition.
Based on the above embodiments, this embodiment further describes and optimizes the technical solution, and as a preferred implementation, the number of MLCCs at the input end and the output end of the voltage converting circuit can be adjusted according to the user-defined requirement.
Specifically, in this embodiment, the number of the input terminals and the output terminals MLCC of the voltage conversion circuit can be adjusted according to the user-defined requirement. That is, the MLCCs provided at the input terminal and the output terminal of the voltage converting circuit are only required to be arranged on the surface layer and the bottom layer of the motherboard in a mirror symmetry manner in an even number, and the number of the MLCCs provided at the input terminal and the output terminal of the voltage converting circuit is not particularly limited.
In addition, in practical application, the number of the MLCCs at the input end and the output end of the voltage conversion circuit are independent from each other and cannot influence each other, so that the user experience of a user when using the MLCC howling noise elimination device can be further improved.
Based on the above embodiments, this embodiment further describes and optimizes the technical solution, and as a preferred implementation, the power chip is specifically Richtek RT 8129B.
In practical application, the power chip can be set as Richtek RT8129B, because Richtek RT8129B not only has stable and reliable working performance, but also has low cost, when the power chip is set as Richtek RT8129B, the capital cost required to be invested by the eliminating device can be relatively reduced.
Based on the above embodiments, this embodiment further describes and optimizes the technical solution, and as a preferred implementation, the voltage conversion circuit is specifically a buck circuit.
It can be understood that, because the main application scenario of the erasing apparatus is a notebook computer, and the power supply of the notebook computer is mainly from an adapter or a battery, wherein the power supply voltage of the adapter or the battery is usually above 12V, and the power supply voltage of most chips on the motherboard is below 12V, for example: 5V, 3.3V, 2.5V, etc., and therefore, a step-down output of the adapter or the battery is required.
In the present embodiment, in consideration of this factor, the voltage conversion circuit is configured as a buck circuit (buck converter circuit), so that the universality of the cancellation device in the actual use process can be improved.
Referring to fig. 3, fig. 3 is a structural diagram of another apparatus for removing MLCC howling noise according to an embodiment of the present invention. As a preferred embodiment, the buck circuit includes: a first switch tube K1, a second switch tube K2 and an inductor L;
the control end of the first switch tube K1 is connected with an HG pin of the power chip, the second end of the first switch is respectively connected with a PH pin of the power chip, the first end of the second switch tube K2 and the first end of the inductor L, the control end of the second switch tube K2 is connected with an LG pin of the power chip, and the second end of the second switch tube K2 is grounded;
accordingly, the first terminal of the first switch tube K1 is the input terminal of the buck circuit, and the second terminal of the inductor L is the output terminal of the buck circuit.
In this embodiment, a specific configuration structure of the buck circuit is provided, that is, the buck circuit is built by using two switching tubes and one inductor. Compared with other buck circuit connection structures, the buck circuit connection structure has the advantage that the difficulty in building the buck circuit can be further reduced through the circuit structure.
In a preferred embodiment, the first switch tube K1 and the second switch tube K2 are both NMOS tubes.
It can be understood that, because the NMOS transistor has a smaller on-resistance and is less difficult to manufacture, when the first switch transistor K1 and the second switch transistor K2 in the buck circuit are both configured as NMOS transistors, the overall usability of the buck circuit in the use process can be relatively improved.
It should be noted that, an HG (High-side MOSFET gate driver output) pin of the power chip represents an upper bridge MOSFET gate driving end of the power chip, an LG (low-side MOSFET gate driver output) pin of the power chip represents a lower bridge MOSFET gate driving end of the power chip, a ph (switch node) pin of the power chip is used for connecting a drain of the upper bridge MOSFET and a source of the lower bridge MOSFET, and an en (enable control) pin of the power chip represents an enable end of the power chip.
Correspondingly, the embodiment of the invention also discloses a notebook computer, which comprises the device for eliminating the MLCC howling noise disclosed by the invention.
The notebook computer provided by the embodiment of the invention has the beneficial effects of the elimination device of the MLCC howling noise disclosed by the invention.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, 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, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The MLCC howling noise eliminating device and the notebook computer provided by the present invention are introduced in detail above, and a specific example is applied in this document to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (7)
1. An apparatus for removing MLCC howling noise, comprising: the power supply comprises a main board, wherein a power supply chip and a voltage conversion circuit connected with the power supply chip are arranged on the main board, and an even number of MLCCs which have the same specification and are arranged on the surface layer and the bottom layer of the main board in a mirror symmetry mode are arranged at the input end and the output end of the voltage conversion circuit.
2. The cancellation apparatus of claim 1, wherein the number of MLCCs at the input and output of the voltage conversion circuit is adjustable according to user-defined requirements.
3. The eliminating device according to claim 1, characterized in that the power chip is embodied as Richtek RT 8129B.
4. The cancellation apparatus according to any one of claims 1 to 3, wherein the voltage conversion circuit is a buck circuit.
5. The cancellation apparatus according to claim 4, wherein the buck circuit includes: the circuit comprises a first switching tube, a second switching tube and an inductor;
the control end of the first switch tube is connected with an HG pin of the power chip, the second end of the first switch is respectively connected with a PH pin of the power chip, the first end of the second switch tube and the first end of the inductor, the control end of the second switch tube is connected with an LG pin of the power chip, and the second end of the second switch tube is grounded;
correspondingly, the first end of the first switch tube is the input end of the buck circuit, and the second end of the inductor is the output end of the buck circuit.
6. The cancellation apparatus of claim 5, wherein the first switch tube and the second switch tube are both NMOS tubes.
7. A notebook computer comprising an MLCC howling noise cancellation apparatus as claimed in any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111274659.2A CN114138064B (en) | 2021-10-29 | 2021-10-29 | MLCC (multi-layer ceramic) howling noise eliminating device and notebook computer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111274659.2A CN114138064B (en) | 2021-10-29 | 2021-10-29 | MLCC (multi-layer ceramic) howling noise eliminating device and notebook computer |
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| CN114138064A true CN114138064A (en) | 2022-03-04 |
| CN114138064B CN114138064B (en) | 2024-02-23 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202565326U (en) * | 2012-03-27 | 2012-11-28 | 深圳市鸿宇顺科技有限公司 | Circuit board for lowering main board noise and mobile phone |
| US20130322650A1 (en) * | 2012-05-31 | 2013-12-05 | Hon Hai Precision Industry Co., Ltd. | Noise elimination circuit for audio equipment |
| US20140307889A1 (en) * | 2013-04-12 | 2014-10-16 | Apple Inc. | Adaptive vibration damping mechanism to eliminate acoustic noise in electronic systems |
| CN110445356A (en) * | 2019-08-15 | 2019-11-12 | 合肥联宝信息技术有限公司 | A kind of DC-DC converting means and method |
-
2021
- 2021-10-29 CN CN202111274659.2A patent/CN114138064B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202565326U (en) * | 2012-03-27 | 2012-11-28 | 深圳市鸿宇顺科技有限公司 | Circuit board for lowering main board noise and mobile phone |
| US20130322650A1 (en) * | 2012-05-31 | 2013-12-05 | Hon Hai Precision Industry Co., Ltd. | Noise elimination circuit for audio equipment |
| US20140307889A1 (en) * | 2013-04-12 | 2014-10-16 | Apple Inc. | Adaptive vibration damping mechanism to eliminate acoustic noise in electronic systems |
| CN110445356A (en) * | 2019-08-15 | 2019-11-12 | 合肥联宝信息技术有限公司 | A kind of DC-DC converting means and method |
Non-Patent Citations (2)
| Title |
|---|
| WEI-CHUNG CHEN等: "Reduction of equivalent series inductor effect in delay-ripple reshaped constant on-time control for buck converter with multi-layer ceramic capacitors", 《2012 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)》, 10 November 2012 (2012-11-10) * |
| 李加峰;楼然苗;: "带啸叫检测与抑制的音频功率放大器", 数字技术与应用, no. 12, 15 December 2015 (2015-12-15) * |
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