CN105636421B - Household appliance and device for reducing interference voltage - Google Patents
Household appliance and device for reducing interference voltage Download PDFInfo
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- CN105636421B CN105636421B CN201610045477.0A CN201610045477A CN105636421B CN 105636421 B CN105636421 B CN 105636421B CN 201610045477 A CN201610045477 A CN 201610045477A CN 105636421 B CN105636421 B CN 105636421B
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- circuit board
- metal plate
- household appliance
- board box
- interference voltage
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
- Cookers (AREA)
Abstract
The invention provides a household appliance and a method for reducing interference voltage of the household appliance. The household appliance comprises a circuit board, a circuit board box and a metal plate, wherein the circuit board box is made of an insulating material and is located between the circuit board and the metal plate. The household appliance further comprises a metal plate, wherein the metal plate is arranged between the circuit board and the circuit board boxes or between the metal plate and the circuit board boxes, the metal plate and the circuit board are spaced at a preset distance, and are in electrical contact with each other. The invention also provides a method for reducing the interference voltage of the household appliance. The household appliance and the method for reducing the interference voltage of the household appliance can effectively reduce the dielectric constant and the parasitic capacitance value by arranging the metal plate, thereby realizing the reduction of the interference voltage, and having the advantages of simple, convenient, economical and practical installation structure.
Description
Technical Field
The invention relates to the field of household appliances, in particular to a device for reducing interference voltage in a household appliance.
Background
In some household appliances, due to safety considerations and space limitations, the power panel is generally arranged on the inner side wall of the box body of the household appliance, and under the installation structure, a relatively large parasitic capacitor is arranged between the power panel and a metal plate for fixing the power panel, interference voltage can be generated by the capacitor, the interference voltage has certain damage to the household appliance, the service life of the household appliance is greatly shortened, and therefore the interference voltage must be tested on the household appliance. Sometimes, in order to pass the test of the interference voltage, an interference suppressor needs to be used, but the cost is higher, especially for high-power household appliances.
In the prior art, the bulletin number isCN204131486UThe Chinese invention patent discloses an anti-interference touch circuit of a washing machine touch key, and particularly discloses an anti-interference touch circuit of a washing machine touch key, which comprises a touch chip and a touch chip filter capacitor, wherein the touch chip filter capacitor is connected to the touch chip, and one end of the touch chip filter capacitor is connected to a power supply Vcc end through a first magnetic bead filter connecting circuit. The scheme overcomes the defects of interference false response and failure of interference voltage test by circuit integration consisting of electrical elements, but has a smaller application range.
Chinese patent publication No. CN204325776U discloses a starting circuit of a washing machine, and specifically discloses an electric element and connection relationship included in the starting circuit of a washing machine for solving the problem of electromagnetic interference. The scheme solves the intermittent disturbance of the interference voltage of the washing machine through the arranged starting circuit, but the design of the starting circuit is more complex.
Chinese patent application publication No. CN101409137A discloses an interference voltage filter for use between a power supply and an electronic product, and specifically discloses an interference voltage filter comprising at least one planar element comprising a pair of opposed coreless spiral planar windings and a planar capacitor. The scheme solves the interference voltage between the power supply and the electronic product through the interference filter, but the cost is high.
Disclosure of Invention
The device for reducing the interference voltage can effectively reduce the interference voltage, has simple structure and low cost, and reduces the interference voltage in the household appliance.
The invention provides a household appliance which comprises a circuit board, a circuit board box and a metal plate, wherein the circuit board box is made of an insulating material and is positioned between the circuit board and the metal plate; the household appliance further comprises a metal plate, wherein the metal plate is arranged between the circuit board and the circuit board boxes or between the metal plate and the circuit board boxes, the metal plate and the circuit board are spaced at a preset distance, and are in electrical contact with each other.
Preferably, the household appliance further comprises a box body side plate, and the metal plate is fixed to the box body side plate.
Preferably, the circuit board is a power board, and an electronic component is arranged on one surface of the power board far away from the circuit board box.
Preferably, the metal plate is attached to one side surface of the circuit board box.
Preferably, the metal plate is provided with a fixing hole, the circuit board box is provided with a plastic bulge, and the fixing hole is matched with the plastic bulge during installation.
The invention also provides a method for reducing the interference voltage of the household appliance, wherein the household appliance comprises a circuit board, a circuit board box and a metal plate, the circuit board box is made of an insulating material and is positioned between the circuit board and the metal plate, and the method comprises the following steps:
s1, detecting a parasitic capacitance value between the circuit board and the metal plate in advance;
s2, judging whether the parasitic capacitance value is larger than a preset threshold value, if so, entering the step S3, and if not, ending the step;
s3 a metal plate is arranged between the circuit board and the circuit board box or between the metal plate and the circuit board box, and the size of the metal plate is corresponding to the size of the circuit board or the size of the metal plate.
Preferably, the method further comprises, between the steps S2 and S3, the steps of: selecting a metal plate with a preset thickness.
The household appliance and the method for reducing the interference voltage of the household appliance can effectively reduce the dielectric constant and the parasitic capacitance value by arranging the metal plate, thereby realizing the reduction of the interference voltage, and having the advantages of simple, convenient, economical and practical installation structure.
Drawings
Fig. 1 is a schematic structural diagram of a household appliance according to a preferred embodiment of the present invention.
Fig. 2 is a top view of a circuit board of a household appliance according to a preferred embodiment of the present invention.
Fig. 3 is a schematic sectional view taken along line a-a in fig. 2.
Fig. 4 is an enlarged schematic view of fig. 3 at B.
Fig. 5 is a flow chart illustrating a method for reducing interference voltage of a household appliance according to a preferred embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples. It should be noted that, if not conflicting, the embodiments of the present invention and the features of the embodiments may be combined with each other within the scope of protection of the present invention.
Example 1
Referring to fig. 1-4, fig. 1 is a schematic structural diagram of a household appliance according to a preferred embodiment of the present invention. Fig. 2 is a top view of a circuit board of a household appliance according to a preferred embodiment of the present invention. Fig. 3 is a schematic sectional view taken along line a-a in fig. 2. Fig. 4 is an enlarged schematic view of fig. 3 at B.
As shown in fig. 1 to 4, the present invention provides a household appliance, which includes a circuit board, a circuit board box and a metal plate, wherein the circuit board box is made of an insulating material and is located between the circuit board and the metal plate; the household appliance further comprises a metal plate, wherein the metal plate is arranged between the circuit board and the circuit board boxes or between the metal plate and the circuit board boxes, the metal plate and the circuit board are spaced at a preset distance, and are in electrical contact with each other. The household appliance can effectively reduce the dielectric constant and the parasitic capacitance value by arranging the metal plate, thereby realizing the reduction of interference voltage, and has the advantages of simple and convenient installation structure, economy and practicality.
Specifically, the metal sheet 3 the circuit board box 4 is located panel beating 1 with between the circuit board 2, the metal sheet 3 with the circuit board 2 the electroless contact of panel beating 1, the metal sheet 3 is fixed in the one side of circuit board box 4, the panel beating 1 the circuit board 2 the metal sheet 3 separates the distance of predetermineeing each other, the panel beating 1 the circuit board 2 the circuit board box 4 separates the distance of predetermineeing each other. The metal plate 3 covers the circuit board 2 in area. The metal plate 3 may be replaced by graphite, and the metal plate 3 may also be replaced by other conductive materials. The metal plate 3 is located on a side of the circuit board case 4 close to the circuit board 2; or the metal plate 3 is located on a side of the circuit board case 4 remote from the circuit board 2. The metal plate 3 can also be positioned between the metal plate 1 and the circuit board box 4, the metal plate 3 is connected with the circuit board box 4 through an insulating support, and the metal plate 3, the metal plate 1 and the circuit board box 4 are separated from each other by a preset distance; or the metal plate 3 is positioned between the circuit board 2 and the circuit board box 4, the metal plate 3 is connected with the circuit board box 4 through an insulating support, and the metal plate 3, the circuit board 2 and the circuit board box 4 are separated from each other by a preset distance. The metal plate 3 can be connected with the circuit board 2 through an insulating bracket, the metal plate 3 is positioned between the circuit board 2 and the circuit board box 4, and the metal plate 3, the circuit board 2 and the circuit board box 4 are separated from each other by a preset distance; or the metal plate 3 pass through the insulating support with panel beating 1 is connected, the metal plate 3 is located panel beating 1 with between the circuit board box 4, the metal plate 3 the panel beating 1 the circuit board box 4 separates the distance of predetermineeing each other.
As shown in fig. 4, the household appliance further includes a box side plate 8, and the metal plate 1 is fixed on the box side plate 8.
As shown in fig. 2 and fig. 3, the circuit board 2 is provided with a first electronic component 5, a second electronic component 6, and a third electronic component 7, and other electrical components on the circuit board 2 are not described in detail.
Furthermore, the circuit board 2 is a power panel, and an electronic component is arranged on one surface of the power panel, which is far away from the circuit board box.
Further, the metal plate 3 is attached to one side surface of the circuit board box.
Furthermore, the metal plate 3 is provided with a fixing hole, the circuit board box is provided with a plastic bulge, and the fixing hole is matched with the plastic bulge during installation.
Referring to fig. 5, fig. 5 is a flowchart illustrating a method for reducing interference voltage of a household appliance according to a preferred embodiment of the invention. As shown in fig. 5, the present invention further provides a method for reducing interference voltage of a household appliance, wherein the household appliance includes a circuit board, a circuit board box and a metal plate, the circuit board box is made of an insulating material and is located between the circuit board and the metal plate, and the method includes the following steps:
s1, detecting a parasitic capacitance value between the circuit board and the metal plate in advance;
s2, judging whether the parasitic capacitance value is larger than a preset threshold value, if so, entering the step S3, and if not, ending the step;
s3 a metal plate is arranged between the circuit board and the circuit board box or between the metal plate and the circuit board box, and the size of the metal plate is corresponding to the size of the circuit board or the size of the metal plate.
The method for reducing the interference voltage of the household appliance can effectively reduce the dielectric constant and the parasitic capacitance value by arranging the metal plate, thereby realizing the reduction of the interference voltage and having the advantages of simple and convenient installation structure, economy and practicality.
Further, the method further includes step S4 between the steps S2 and S3, selecting a metal plate with a predetermined thickness.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A household appliance comprises a circuit board, a circuit board box and a metal plate, wherein the circuit board box is made of an insulating material and is positioned between the circuit board and the metal plate; the household appliance is characterized by further comprising a metal plate, wherein the metal plate is arranged between the circuit board and the circuit board box, or the metal plate is arranged between the metal plate and the circuit board box, and the metal plate, the metal plate and the circuit board are spaced at a preset distance and are in non-electrical contact with each other.
2. The household appliance of claim 1, further comprising a cabinet side plate, wherein the sheet metal is secured to the cabinet side plate.
3. The household appliance according to claim 1, wherein the circuit board is a power board provided with electronic components on a side thereof remote from the circuit board box.
4. The household appliance according to claim 1, wherein the metal plate is attached to one side surface of the circuit board box.
5. The household appliance according to claim 1, wherein the metal plate is provided with a fixing hole, the circuit board box is provided with a plastic protrusion, and the fixing hole is matched with the plastic protrusion when the circuit board box is installed.
6. A method for reducing interference voltage of a household appliance, wherein the household appliance comprises a circuit board, a circuit board box and a metal plate, the circuit board box is made of an insulating material and is positioned between the circuit board and the metal plate, and the method is characterized by comprising the following steps:
1) detecting a parasitic capacitance value between the circuit board and the metal plate in advance;
2) judging whether the parasitic capacitance value is larger than a preset threshold value, if so, entering a step 3), and if not, ending;
3) and a metal plate is arranged between the circuit board and the circuit board box or between the metal plate and the circuit board box, and the size of the metal plate is corresponding to that of the circuit board or that of the metal plate.
7. The method for reducing interference voltage of household appliances according to claim 6, further comprising, between the steps 2) and 3): selecting a metal plate with a preset thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610045477.0A CN105636421B (en) | 2016-01-22 | 2016-01-22 | Household appliance and device for reducing interference voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610045477.0A CN105636421B (en) | 2016-01-22 | 2016-01-22 | Household appliance and device for reducing interference voltage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105636421A CN105636421A (en) | 2016-06-01 |
| CN105636421B true CN105636421B (en) | 2020-04-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610045477.0A Active CN105636421B (en) | 2016-01-22 | 2016-01-22 | Household appliance and device for reducing interference voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105636421B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110324994B (en) * | 2018-03-28 | 2022-04-12 | 青岛海尔洗涤电器有限公司 | Power supply board box and clothes dryer |
| CN110325006A (en) * | 2018-03-28 | 2019-10-11 | 青岛海尔滚筒洗衣机有限公司 | Power panel box mounting structure and household electrical appliance |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103677455A (en) * | 2012-09-10 | 2014-03-26 | 海信（山东）冰箱有限公司 | Power grid interference preventing working circuit for refrigerator capacitive touch screen |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4720184B2 (en) * | 2005-01-07 | 2011-07-13 | 船井電機株式会社 | Printed circuit board and electronic device including the same |
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2016
- 2016-01-22 CN CN201610045477.0A patent/CN105636421B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103677455A (en) * | 2012-09-10 | 2014-03-26 | 海信（山东）冰箱有限公司 | Power grid interference preventing working circuit for refrigerator capacitive touch screen |
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| Publication number | Publication date |
|---|---|
| CN105636421A (en) | 2016-06-01 |
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