CN102193590B - Portable computer and noise filtering method thereof - Google Patents
Portable computer and noise filtering method thereof Download PDFInfo
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- CN102193590B CN102193590B CN2010101364562A CN201010136456A CN102193590B CN 102193590 B CN102193590 B CN 102193590B CN 2010101364562 A CN2010101364562 A CN 2010101364562A CN 201010136456 A CN201010136456 A CN 201010136456A CN 102193590 B CN102193590 B CN 102193590B
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Abstract
The invention relates to a portable computer and a noise filtering method thereof. The portable computer comprises a main board, a wireless communication module and a control module, wherein the main board comprises a power supply input end, a low-pass filter and a noise-filtering switch; the power supply input end is used for receiving a power supply signal; the low-pass filter is used for filtering the high-frequency noise of the power supply signal; the noise-filtering switch can enable the low-pass filter according to a control signal; the wireless communication module is used for wirelessly transmitting a wireless signal; and the control module is used for detecting if the strength of the wireless signal is lower than a preset strength, so as to generate the control signal. In such a manner, the power consumption can be reduced and the interference of the power supply signal to the wireless signal also can be reduced.
Description
Technical field
The present invention relates to a kind of noise filtering technology of power supply signal, and be particularly related to a kind of noise filtering technology that is applicable to have the portable computer of wireless communication module.
Background technology
Along with the progress of science and technology, computing machine is also day by day popularized.Particularly, portable computer possesses the height convenience, and nearly all disposes wireless communication module, can satisfy the multifarious demand of people, more is subject to people's favor.It is worth mentioning that, portable computer provides power supply with battery, and its battery endurance (battery life) still has sizable space of improving.How to prolong the battery endurance of portable computer, become one of important topic of each manufacturer.
In addition, in the place that barrier stands in great numbers, the reception quality of wireless communication module is also to be improved.Moreover, when portable computer utilized wireless communication module to carry out wireless transmission, wireless signal was easy to be subject to the interference of high frequency noise and has influence on the reception quality.In order to improve the reception quality, in known technology, can in portable computer, configure the noise filtering circuit, reduce noise to the interference of reception quality.Yet the noise filtering circuit operates for a long time, can cause a large amount of losses of electric power.
Summary of the invention
The invention provides a kind of portable computer, capable of reducing power consumption, signal capable of reducing power source is to the interference of wireless signal again.
The invention provides a kind of noise filtering method.Constantly bad in the wireless signal reception, can strengthen the intensity of wireless signal.When the wireless signal reception is good, capable of reducing power consumption.
The present invention proposes a kind of portable computer, and it comprises motherboard, wireless communication module and control module.Motherboard comprises power input, low-pass filter and noise filtering switch.Power input is in order to receive power supply signal.Low-pass filter is in order to the high frequency noise of filter out power signal.The noise filtering switch is coupled between low-pass filter and the power input, can be according to control signal activation low-pass filter.Wireless communication module is in order to the wireless transmission wireless signal.Whether control module is lower than preset strength in order to the intensity of detected wireless signals, uses the generation control signal.
In one embodiment of this invention, above-mentioned low-pass filter comprises filter resistance and filter capacitor.Filter resistance has first end and the second end.The first end of filter resistance couples the noise filtering switch.Filter capacitor has first end and the second end.The first end of filter capacitor and the second end couple respectively the second end and the earth terminal of filter resistance.
In one embodiment of this invention, the noise filtering switch is transistor.In another embodiment, wireless communication module is 3G (Third Generation) Moblie module or Wi-Fi module.In another embodiment, control module can be integrated in the wireless communication module or in the motherboard.In an embodiment more, wireless communication module couples motherboard or is integrated in the motherboard.
From another angle, the present invention proposes a kind of portable computer, and it comprises motherboard, wireless communication module and control module.Motherboard comprises first, second low-pass filter of power input and first, second noise filtering switch.Power input is in order to receive power supply signal.The first low-pass filter is in order to the first high frequency noise of filter out power signal.The first noise filtering switch is coupled between the first low-pass filter and the power input, can be according to the first control signal activation the first low-pass filter.The second low-pass filter is in order to the second high frequency noise of filter out power signal.The second noise filtering switch is coupled between the second low-pass filter and the power input, can be according to the second control signal activation the second low-pass filter.Wireless communication module is in order to the wireless transmission wireless signal.Control module is in order to the intensity of detected wireless signals.When the intensity of wireless signal is lower than preset strength, but the frequency band of control module detected wireless signals also produces the first control signal, the second control signal and combination thereof one of them according to this.
From another angle, the present invention proposes a kind of noise filtering method, is applicable to portable computer.Portable computer comprises motherboard and wireless communication module.Noise filtering method comprises that whether the intensity of the wireless signal that the detection wireless communication module receives is lower than preset strength, uses the generation control signal.In addition, can whether determine the activation low-pass filter according to above-mentioned control signal, use the high frequency noise of the power supply signal that the filtering motherboard receives.
From an angle again, the present invention proposes a kind of noise filtering method, is applicable to portable computer.Portable computer comprises motherboard and wireless communication module.Noise filtering method comprises whether the intensity of the wireless signal that the detection wireless communication module receives is lower than preset strength.When the intensity of wireless signal is lower than preset strength, but the frequency band of portable computer detected wireless signals and produces one of them of a plurality of control signals and combination thereof according to this, wherein an above-mentioned control signal corresponding low-pass filter respectively.In addition, can be according to the low-pass filter of the above-mentioned correspondence of control signal activation of above-mentioned generation, use the high frequency noise of the power supply signal that the filtering motherboard receives.
Based on above-mentioned, the present invention determines whether power supply signal is carried out low-pass filtering treatment by the intensity of detected wireless signals.Carry out in the situation of low-pass filtering treatment, signal capable of reducing power source is to the interference of wireless signal.Carry out in the absence of low-pass filtering treatment, can keep the power-efficient of power supply signal.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and cooperate accompanying drawing to be described in detail below.
Description of drawings
Fig. 1 is the schematic diagram according to a kind of portable computer of the first embodiment of the present invention.
Fig. 2 is according to a kind of noise filtering switch of the first embodiment of the present invention and the circuit diagram of low-pass filter.
Fig. 3 is the schematic diagram according to the frequency response of a kind of low-pass filter 61 of the first embodiment of the present invention.
Fig. 4 is the schematic diagram according to the frequency response of a kind of low-pass filter 62 of the first embodiment of the present invention.
Fig. 5 is the process flow diagram according to a kind of noise filtering method of the first embodiment of the present invention.
Fig. 6 is the schematic diagram according to a kind of portable computer of the second embodiment of the present invention.
Fig. 7 is the process flow diagram according to a kind of noise filtering method of the second embodiment of the present invention.
Fig. 8 is the schematic diagram according to a kind of wireless communication module of the third embodiment of the present invention.
[main element symbol description]
10,11: portable computer
20,21: motherboard
30,31: wireless communication module
40: control module
51,52: the noise filtering switch
61,62: low-pass filter
70: power supply circuit
511,521: transistor
611,621: resistance
612,622: electric capacity
S501～S504, S701～S703: each step of noise filtering method
IN: power input
PS: power supply signal
CS1, CS2: control signal
WS: wireless signal
Embodiment
Known portable computer has the reception quality to be vulnerable to the shortcoming of noise, if adopt the noise filtering circuit can cause a large amount of power consumption again.
Review, in an embodiment of the present invention, portable computer can detect the reception quality of wireless communication module, uses decision and whether starts noise filtering circuit (for example low-pass filter).More particularly, if when the intensity of wireless signal is bad, can start the high frequency noise that the noise filtering circuit comes the filter out power signal, reduce the high frequency noise of power supply signal to the interference of wireless signal, use the intensity of improving wireless signal.When if the intensity of wireless signal is good, represent wireless signal and be not vulnerable to noise, can close the noise filtering circuit this moment, uses the battery endurance that prolongs portable computer.Thus, not only can effectively prolong battery endurance, when the reception quality of wireless signal is bad, also can be improved.Elaborate below with reference to the accompanying drawings embodiments of the invention, accompanying drawing for example understands example embodiment of the present invention, wherein same the or similar step of same numeral indication.
Fig. 1 is the schematic diagram according to a kind of portable computer of the first embodiment of the present invention.Please refer to Fig. 1, portable computer 10 comprises motherboard 20, wireless communication module 30 and control module 40.Motherboard 20 can comprise power input IN, noise filtering switch 51,52 and low- pass filter 61,62.
Fig. 2 is according to a kind of noise filtering switch of the first embodiment of the present invention and the circuit diagram of low-pass filter.Fig. 3 is the schematic diagram according to the frequency response of a kind of low-pass filter 61 of the first embodiment of the present invention.Fig. 4 is the schematic diagram according to the frequency response of a kind of low-pass filter 62 of the first embodiment of the present invention.Please merge with reference to Fig. 1～Fig. 4, in the present embodiment, noise filtering switch 51,52 for example available transistor 511,521 is implemented.Low-pass filter 61 for example available resistance 611 is implemented with electric capacity 612.Low-pass filter 62 for example available resistance 621 is implemented with electric capacity 622.In the present embodiment, low-pass filter can cooperate wireless communication module 30 employed frequency bands to carry out corresponding noise filtering processing.
For instance, the cutoff frequency of low-pass filter 61 for example is to fall within 900MHz.The cutoff frequency of low-pass filter 62 for example is to fall within 1800MHz.But the present invention is as limit, and low- pass filter 61,62 cutoff frequency also can be other frequencies in other embodiments.Those skilled in the art can change the resistance of resistance and the capacitance of electric capacity according to its demand, make low- pass filter 61,62 have different cutoff frequencys.
In addition, though low-pass filter 61 in the present embodiment, 62 describes as an example of a resistance and electric capacity example, the present invention is not as limit.Those skilled in the art also can adopt other modes to implement low-pass filter, for example also can implement low-pass filter with the wave filter of multistage framework.
Fig. 5 is the process flow diagram according to a kind of noise filtering method of the first embodiment of the present invention.Please merge with reference to Fig. 1, Fig. 2 and Fig. 5, at first can be by step S501, whether the intensity of the wireless signal WS that control module 40 detection wireless communication modules 30 are received and dispatched is lower than preset strength.More particularly, in the present embodiment, that the intensity of wireless signal WS can be divided into is good, good and bad Three Estate.When the intensity of wireless signal WS when being good or good, the intensity that represents wireless signal WS is higher than preset strength, the execution in step that can continue S502.When the intensity of wireless signal WS when being bad, the intensity that represents wireless signal WS is lower than preset strength, the execution in step that can continue S503.Should be noted, in other embodiments, those skilled in the art also can change according to its demand strength grading mode and the preset strength of wireless signal.
In step S502, each low-pass filter of control module 40 forbidden energy (61,62) is used reduction power consumption.More particularly, control module 40 can produce control signal CS1, CS2, uses "off" transistor 511,521.In case transistor 511,521 cut-offs, low- pass filter 61,62 can be in disabled state.
In step S503, the control module 40 further employed frequency band of detected wireless signals WS is used one of them that produces corresponding control signal CS1, CS2 and combination thereof.But and subsequent steps S504, use low-pass filter corresponding to activation according to the control signal of above-mentioned generation, use the high frequency noise of the power supply signal PS that filtering motherboard 20 receives.More particularly, when the employed frequency band of wireless signal WS is 1800,1900, during 2100MHz, control module 40 can be passed through control signal CS1 forbidden energy low-pass filter 61, and by control signal CS2 activation low-pass filter 62.So effectively filter out power signal PS medium frequency is higher than the high frequency noise of 1800MHz.
When the employed frequency band of wireless signal WS is 800, during 900MHz, control module 40 can be passed through control signal CS1 activation low-pass filter 61, and by control signal CS2 forbidden energy low-pass filter 62.So effectively filter out power signal PS medium frequency is higher than the high frequency noise of 900MHz.
In another embodiment, when the employed frequency band of wireless signal WS is 800, during 900MHz, control module 40 also can be by control signal CS1 and CS2 in the lump activation low-pass filter 61 and 62.So can strengthen the high frequency noise that filter out power signal PS medium frequency is higher than 900MHz.
Although portable computer and noise filtering method have been depicted a possible type in above-described embodiment, but those skilled in the art should know, each manufacturer is all different for the design of portable computer and noise filtering method, and therefore application of the present invention is when being not limited in the possible type of this kind.In other words, so long as detect the intensity of the wireless signal of wireless communication module, and determine that according to this whether power supply signal being carried out noise filtering processes, be to have met spiritual place of the present invention just.Below again for several embodiment so that those skilled in the art can further understand spirit of the present invention, and implement the present invention.
In the first embodiment, though portable computer has used two noise filtering switches, two low-pass filters, the present invention is not as limit.In other embodiments, those skilled in the art also can adopt noise filtering switch and low-pass filter more than one or three to implement portable computer.For instance, Fig. 6 is the schematic diagram according to a kind of portable computer of the second embodiment of the present invention.Fig. 7 is the process flow diagram according to a kind of noise filtering method of the second embodiment of the present invention.
Please merge with reference to Fig. 6 and Fig. 7, in the present embodiment, motherboard 21 a noise filtering switch 51 of configuration and low-pass filters 61 of portable computer 11.Thus, the framework that can simplify portable computer also can be simplified the method for noise filtering.At first can be by step S701, whether the intensity of the wireless signal WS that control module 40 detection wireless communication modules 30 receive is lower than preset strength.If the intensity of wireless signal WS is higher than then subsequent steps S702 of preset strength, control module 40 is used forbidden energy low-pass filter 61 by control signal CS1 cut-off noise filtering switch 51.Can reduce power consumption thus.
Otherwise if the intensity of wireless signal WS is lower than then subsequent steps S703 of preset strength, control module 40 is used activation low-pass filter 61 by control signal CS1 conducting noise filtering switch 51.But the high frequency noise of filter out power signal PS is used the signal to noise ratio (S/N ratio) that promotes wireless signal WS thus.
In addition, the framework of the portable computer of Fig. 1 only is a kind of selection embodiment, and the present invention is not as limit.For instance, in other embodiments, control module can be integrated in the wireless communication module.Fig. 8 is the schematic diagram according to a kind of wireless communication module of the third embodiment of the present invention.In the present embodiment, control module (not illustrating) is integrated in the wireless communication module 31.Because wireless communication module 31 has many untapped pin position, therefore can export control signal CS1, CS2 with two untapped pin positions.So also can reach the effect similar with the first embodiment.In another embodiment, control module also can be integrated in the motherboard.In like manner, in another embodiment, wireless communication module also can be integrated in the motherboard.
In the embodiment in figure 1, though wireless communication module 30 describe as an example of the 3G communication module example.But wireless communication module 30 also can be the communication module of other types in other embodiments, for example can be the WiFi communication module.Those skilled in the art can the corresponding cutoff frequency that changes low-pass filter.So also can reach the effect similar with the first embodiment.
In sum, portable computer of the present invention can detect the intensity without the news signal.When the intensity of wireless signal is lower than preset strength, but the activation low-pass filter is used power supply signal is carried out low-pass filtering treatment.The interference that the high frequency noise of signal capable of reducing power source like this causes wireless signal.When the intensity of wireless signal is higher than preset strength, but the forbidden energy low-pass filter.So can reduce power consumption, use the battery endurance that promotes portable computer.In addition, embodiments of the invention also have following effect:
1. in portable computer, configure a plurality of low-pass filters with different cutoff frequencys.Can be for the employed frequency band of wireless signal and low-pass filter corresponding to optionally activation, use the high frequency noise of filter out power signal.So can effectively promote the signal to noise ratio (S/N ratio) of wireless signal.
2. low-pass filter can adopt single order or multi-stage filter, uses to promote the noise filtering effect.
3. a plurality of low-pass filters of simultaneously activation can be strengthened the noise filtering effect further.
4. control module, wireless communication module and/or motherboard are integrated and to be simplified framework.
Although the present invention with embodiment openly as above; so it is not to limit the present invention, those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little change and retouching, therefore protection scope of the present invention is as the criterion when looking the appended claims person of defining.
Claims (9)
1. portable computer comprises:
One motherboard comprises:
One power input is in order to receive a power supply signal;
One low-pass filter is in order to the high frequency noise of this power supply signal of filtering; And
One noise filtering switch is coupled between this low-pass filter and this power input, according to this low-pass filter of control signal activation;
One wireless communication module is in order to wireless transmission one wireless signal; And
Whether one control module is lower than a preset strength in order to the intensity that detects this wireless signal, uses to produce this control signal.
2. portable computer as claimed in claim 1, this low-pass filter wherein comprises:
One filter resistance has first end and the second end, and the first end of this filter resistance couples this noise filtering switch; And
One filter capacitor has first end and the second end, and the first end of this filter capacitor and the second end couple respectively the second end and an earth terminal of this filter resistance.
3. portable computer as claimed in claim 1, wherein this noise filtering switch is transistor.
4. portable computer as claimed in claim 1, wherein this wireless communication module is 3G (Third Generation) Moblie module or Wi-Fi module.
5. portable computer as claimed in claim 1, wherein this control module is integrated in this wireless communication module or in this motherboard.
6. portable computer as claimed in claim 1, wherein this wireless communication module couples this motherboard or is integrated in this motherboard.
7. portable computer comprises:
One motherboard comprises:
One power input is in order to receive a power supply signal;
One first low-pass filter is in order to one first high frequency noise of this power supply signal of filtering;
One first noise filtering switch is coupled between this first low-pass filter and this power input, according to this first low-pass filter of one first control signal activation;
One second low-pass filter is in order to one second high frequency noise of this power supply signal of filtering; And
One second noise filtering switch is coupled between this second low-pass filter and this power input, according to this second low-pass filter of one second control signal activation;
One wireless communication module is in order to wireless transmission one wireless signal; And
One control module, in order to detect the intensity of this wireless signal, when the intensity of this wireless signal was lower than a preset strength, this control module detected the frequency band of this wireless signal and produces according to this one of them of this first control signal, this second control signal and combination thereof.
8. a noise filtering method is applicable to a portable computer, and this portable computer comprises a motherboard, a wireless communication module and a control module, and this motherboard comprises a low-pass filter and a noise filtering switch, and this noise filtering method comprises:
Whether the intensity that this control module detects the wireless signal that this wireless communication module receives is lower than a preset strength, uses to produce a control signal; And
Whether this noise filtering switch determines this low-pass filter of activation according to this control signal, uses the high frequency noise of the power supply signal that this motherboard of filtering receives.
9. a noise filtering method is applicable to a portable computer, and this portable computer comprises a motherboard, a wireless communication module and a control module, and this motherboard comprises a plurality of low-pass filters and a plurality of noise filtering switch, and this noise filtering method comprises:
Whether the intensity that this control module detects the wireless signal that this wireless communication module receives is lower than a preset strength;
When the intensity of this wireless signal is lower than this preset strength, this control module detects the frequency band of this wireless signal, and produces according to this a plurality of control signals and combination thereof one of them, wherein respectively a corresponding noise filtering switch and low-pass filters of these control signals; And
Whether the noise filtering switch of above-mentioned correspondence determines the low-pass filter of the above-mentioned correspondence of activation according to the control signal of above-mentioned generation, uses the high frequency noise of the power supply signal that this motherboard of filtering receives.
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| CN2010101364562A CN102193590B (en) | 2010-03-12 | 2010-03-12 | Portable computer and noise filtering method thereof |
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| CN2010101364562A CN102193590B (en) | 2010-03-12 | 2010-03-12 | Portable computer and noise filtering method thereof |
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| CN102193590B true CN102193590B (en) | 2013-04-03 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1675844A (en) * | 2002-08-09 | 2005-09-28 | 飞思卡尔半导体公司 | Radio receiver having a variable bandwidth IF filter and method therefor |
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| CN100477653C (en) * | 2004-03-30 | 2009-04-08 | 鼎芯通讯（上海）有限公司 | Binary frequency-shift key-controlled demodulator and frequency voltage conversion circuit |
| US20070183543A1 (en) * | 2006-02-03 | 2007-08-09 | Yung-Wei Lu | Power line communication (PLC) noise isolation device |
| KR101145222B1 (en) * | 2007-07-27 | 2012-05-25 | 삼성전자주식회사 | Power apparatus and wireless communication apparatus having the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1675844A (en) * | 2002-08-09 | 2005-09-28 | 飞思卡尔半导体公司 | Radio receiver having a variable bandwidth IF filter and method therefor |
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