CN101098102A - Device for preventing cacophony of electric source - Google Patents
Device for preventing cacophony of electric source Download PDFInfo
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- CN101098102A CN101098102A CNA2006100283519A CN200610028351A CN101098102A CN 101098102 A CN101098102 A CN 101098102A CN A2006100283519 A CNA2006100283519 A CN A2006100283519A CN 200610028351 A CN200610028351 A CN 200610028351A CN 101098102 A CN101098102 A CN 101098102A
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- power supply
- noise
- cacophony
- smps
- preventing
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Abstract
A power foreign noise prevent device uses an electrolyte capacitor to connect the earth connectors of a switch-mode power supply and a heat radiator, and uses the earth connection to reduce the foreign noise. The power suppler with a switch-mode power supply (SMPS)uses an electrolyte capacitor to connect the earth connectors of a switch-mode power supply and a heat radiator. Therefore, the invention can use the earth connection to reduce the conducted conversion noise and reduce conducted foreign noise, to minimize electromagnetic wave interference.
Description
Technical field
The present invention relates to a kind of device for preventing cacophony of electric source, relate in particular to and a kind ofly make SMPS (switching mode power supply: the electromagnetic wave that the power supply noise switched-mode power supply supply unit) produces harms and reaches minimized device for preventing cacophony of electric source according to power supplier.
Background technology
Generally speaking, in household electrical appliance such as TV or audio equipment, DVD player, refrigerator, washing machine, built-in power feedway by various household electrical appliance inside provides power supply to carry out all operations of instrument, for more stable power is provided, just used suitable SMPS (switching mode power supply: the power supplier switched-mode power supply supply unit).
This power supplier can carry out rectification to exchanging (AC) input power supply, is transformed into direct current (DC) power supply simultaneously.According to toward the current stabilization operation, if remove the fluctuation composition of DC power supply, and stabling current, according to the switch control of SMPS, will reduce the essential electric current of various operating line terminals of supply equipment.
In addition, above-mentioned SMPS form with SMPS IC in power supplier occurs, on ground connection (S) terminal of ground connection (GND) terminal of above-mentioned SMPS IC 30 shown in Figure 1 and radiator (heat sink), will produce power supply noise, the impairment (EMI) that can generate electromagnetic waves of this power supply noise, thus be against the regulation that electromagnetic wave harms.
In order to prevent that this power supply noise and electromagnetic wave from harming, the Y-capacitor or the ground connection (GND) that are connected between 1 side that has just adopted the change filter recently or be connected SMPS and 2 sides are changed electric current.But, this mode that prevents power supply noise the household electrical appliance of relevant power supplier be audio frequency with under the situation of machine, will be that AM sensitivity produces harmful effect to audio performance.
The structure of other electronic units such as the resistance among above-mentioned Fig. 1, electric capacity and effect do not elaborate at this because of not having big relation with background technology of the present invention.
In the SMPS of the audio frequency household electrical appliance that prior art constitutes, for switch I C in 1 side that constitutes with heat sink part, though improve noise to separate IC GND and radiator pattern, but, if from the AM sensitivity of decision audio performance, isolate GND, according to the 10dB degree,, there is the shortcoming that reduces AM sensitivity though can improve the effect that electromagnetic wave harms.
Summary of the invention
The present invention proposes for addressing the above problem just, its purpose is to provide a kind of and connects the earth terminal of switched-mode power supply supply unit (SMPS) and the earth terminal of radiator (heat sink) with electrolytic capacitor, improves the device for preventing cacophony of electric source of conduction noise by ground connection one side.
To achieve these goals, power supplier for power suppling part SMPS with switching mode, device for preventing cacophony of electric source of the present invention is characterised in that, it be a kind of by electrolytic capacitor the interconnective device for preventing cacophony of electric source of earth terminal of the earth terminal of above-mentioned switched-mode power supply supply unit (SMPS) and radiator (heat sink).
Effect of the present invention:
In sum, device for preventing cacophony of electric source of the present invention, earth terminal and radiator earth terminal according to the SMPS of the power supplier on the household electrical appliance, by interconnecting of electrolytic capacitor, can reduce the conversion noise of conduction by earth terminal, minimize thereby make the electromagnetic wave that improves the conduction noise harm to reach.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
Description of drawings
Fig. 1 is the schematic diagram that common power supplier circuit constitutes;
Fig. 2 is the schematic diagram that is applicable to the power supplier formation of device for preventing cacophony of electric source of the present invention;
Fig. 3 a and Fig. 3 b are the oscillograms that expression of the present invention improves the power supply noise state.
The symbol description of major part in the accompanying drawing
10: heat sink part 20: electrolytic capacitor
30:SMPS (switched-mode power supply supply unit)
Embodiment
Execution mode to the device for preventing cacophony of electric source of the present invention that as above constitutes is elaborated below with reference to accompanying drawings.
Fig. 2 is the schematic diagram that is applicable to the power supplier formation of device for preventing cacophony of electric source of the present invention.
As shown in Figure 2, at household electrical appliance, particularly on the SMPS IC 30 of the power supplier of audio player, change IC with 1 top-cross that heat sink part 10 is formed relevant SMPS.
Among the present invention, 1 the side joint ground (GND) of above-mentioned SMPS IC 30 end and radiator 10 ground connection (S) end are not separated, and it is to be connected to each other by electrolytic capacitor 20, bring in the conversion noise (switching noise) that reduces conduction by ground connection.
As mentioned above, if 1 side joint ground GND of SMPS IC30 holds and the ground connection S end of radiator 10 is connected to each other by electrolytic capacitor 20, in noise capable of reducing power source, the reduction trend that also can stop the AM sensitivity of audio performance, electrolytic capacitor 20 is exactly the capacitor C 940 among Fig. 2 in the present embodiment, and the specification of employing is 1 μ f/50V.
Then, before use electrolytic capacitor 20 of the present invention, shown in Fig. 3 a, though shown the noise waveform, but above-mentioned electrolytic capacitor 20 is according to being connected that the ground connection (S) of 1 side joint ground (GND) end and radiator 10 is held, shown in Fig. 3 b, compared in the past with improvement, can produce the above noise standard difference of 3dB.Thereby improved noise.
The structure of other electronic units such as the resistance among above-mentioned Fig. 2, electric capacity and effect are not the features that the present invention need protect, and do not elaborate at this.
The present invention not merely is defined in above-mentioned described embodiment, and the skilled staff of affiliated technical field can be carried out the change and the modification of other concrete form not departing from this invention technological thought and necessary characteristics fully to embodiments of the invention.But, those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (1)
1, a kind of device for preventing cacophony of electric source is characterized in that:
For power supply generator, be to provide above-mentioned switched-mode power supply the earth terminal of portion and the earth terminal of radiator to link together by electrolytic capacitor with switched-mode power supply supply unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100283519A CN101098102A (en) | 2006-06-29 | 2006-06-29 | Device for preventing cacophony of electric source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100283519A CN101098102A (en) | 2006-06-29 | 2006-06-29 | Device for preventing cacophony of electric source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101098102A true CN101098102A (en) | 2008-01-02 |
Family
ID=39011690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006100283519A Pending CN101098102A (en) | 2006-06-29 | 2006-06-29 | Device for preventing cacophony of electric source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101098102A (en) |
-
2006
- 2006-06-29 CN CNA2006100283519A patent/CN101098102A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |