CN202798438U - Integratable power filter - Google Patents
Integratable power filter Download PDFInfo
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- CN202798438U CN202798438U CN 201220376037 CN201220376037U CN202798438U CN 202798438 U CN202798438 U CN 202798438U CN 201220376037 CN201220376037 CN 201220376037 CN 201220376037 U CN201220376037 U CN 201220376037U CN 202798438 U CN202798438 U CN 202798438U
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- Prior art keywords
- switch
- impedance unit
- electric capacity
- power
- supply filter
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Abstract
Provided by the utility model is an integratable power filter that comprises at least one impedance unit connected with a power output terminal. The impedance unit includes: a switch, which is opened/closed according to the preset frequency; at least one first capacitor, which is controlled by the switch to carry out charging; and a second capacitor, which is connected with the impedance unit by the switch. According to the utility model, in the circuit of the power filter, a plurality of first capacitors with flying farad orders are utilized to form a resistor with over the one hundred trillion order, thereby substantially reducing the area occupied by the resistor in the filter chip.
Description
Technical field
The utility model relates to a kind of filter, particularly relates to a kind of power-supply filter that can be integrated.
Background technology
The size of electronic product is along with but the development of integrated circuit is done less and less, so electronic product is more and more higher to the stability requirement of the voltage of power supply output, low especially, in the micro-microphone field, the bias voltage that power supply provides directly affects the job stability of micro-microphone, therefore, need to provide a filter circuit at the micro-microphone power output end.At present, filter circuit commonly used is the RC circuit, and wherein, the resistance of resistance is 100,000,000 above magnitudes, and this is for the more and more less integrated circuit of size, and 100,000,000 grades of shared sizes of other resistance are difficult to meet the dimensional requirement of the filter in the integrated circuit.In order to solve the size of integrated circuit, the filter circuit that the size that filter that can be integrated has also adopted diode and electric capacity to consist of is less, yet, because there is noise in diode component itself, therefore, each filter effect that comprises the filter circuit of diode is subject to the impact of diode component, can't guarantee that the filter of producing in batches out all meets the requirements.
Therefore, need to can improve by integrated power-supply filter existing, reliability is high, the power-supply filter of good stability in order to provide.
The utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of power-supply filter that can be integrated, reliability is high, the power-supply filter of good stability in order to provide.
Reach for achieving the above object other relevant purposes, the utility model provides a kind of power-supply filter that can be integrated, it comprises: the impedance unit that at least one is connected with power output end, wherein, described impedance unit comprises that a switch of opening/closing by predeterminated frequency and at least one are subjected to the first electric capacity of described switch control charging; The second electric capacity that is connected with described impedance unit by described switch; Adjacent described switch is alternately opened/is closed.
Preferably, described impedance unit comprises: the first electric capacity of switch of opening/closing by predeterminated frequency and a plurality of series connection that is subjected to described switch control charging/parallel connection.
Preferably, described impedance unit is a plurality of, and is connected to one by one described power output end.
Preferably, described impedance unit is a plurality of and is connected to one by one described power output end that wherein, each described impedance unit comprises switch and first electric capacity that is subjected to described switch control charging opening/close by predeterminated frequency.
Preferably, adjacent described switch is alternately opened/is closed by default separately frequency.
The described switch of preferably, being separated by act in agreement and the step of adjacent described switch opposite.
Preferably, all described switches according to identical frequency but different step open/close.
Preferably, described switch opens/closes frequency greater than 20KHz.
Preferably, the capacitance of described the first electric capacity is in the Flying Farah magnitude.
As mentioned above, power-supply filter that can be integrated of the present utility model has following beneficial effect: utilize described first electric capacity of a plurality of Flying Farah magnitudes to consist of the above resistance of 100,000,000 magnitudes, can greatly reduce resistance shared area in filter chip; In addition, adopt described the first electric capacity to consist of high resistance measurement in the filter, be conducive to reduce the noise that element itself produces; In addition, only adopt described switch and described the first electric capacity to consist of impedance unit in the filter circuit, greatly reduce the manufacture difficulty of integrated filter, be conducive to be applied in the microcircuit; Also have, the frequency of described switch can avoid described switch on the impact of voice signal more than 20kHz.
Description of drawings
Fig. 1 is shown as the circuit diagram of power-supply filter that can be integrated of the present utility model.
Fig. 2 is shown as the circuit diagram of a kind of preferred version of power-supply filter that can be integrated of the present utility model.
Fig. 3 is shown as the circuit diagram of another preferred version of power-supply filter that can be integrated of the present utility model.
Fig. 4 is shown as the circuit diagram of another preferred version of power-supply filter that can be integrated of the present utility model.
The element numbers explanation
1 power-supply filter
11 impedance units
111 switches
112 first electric capacity
12 second electric capacity
2 power supplys
Embodiment
Below by particular specific embodiment execution mode of the present utility model is described, person skilled in the art scholar can understand other advantages of the present utility model and effect easily by the disclosed content of this specification.
See also Fig. 1 to Fig. 4.Notice, the appended graphic structure that illustrates of this specification, ratio, size etc., equal contents in order to cooperate specification to disclose only, understand and reading for person skilled in the art scholar, be not to limit the enforceable qualifications of the utility model, so technical essential meaning of tool not, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under the effect that the utility model can produce and the purpose that can reach, all should still drop on the technology contents that the utility model discloses and get in the scope that can contain.
Embodiment one
Fig. 1 is shown as the structural representation of power-supply filter that can be integrated of the present utility model.Described power-supply filter 1 comprises: at least one impedance unit 11, the second electric capacity 12.
Described impedance unit 11 is connected with power supply 2 outputs, and it comprises: switch 111 of opening/closing by predeterminated frequency and at least one are subjected to the first electric capacity 112 of described switch 111 control chargings.Wherein, described power supply 2 comprises any power supply that can produce for the acoustic-electric device bigoted voltage, and it includes but not limited to charge pump etc.The quantity of described impedance unit 11 can be one, also can be a plurality of, and when described impedance unit 11 when being a plurality of, each described impedance unit 11 one by one is connected in the output of described power supply 2.Preferably, the resistance value that consists of of all described impedance units 11 is greater than 1G Ω.The quantity of described the first electric capacity 112 can be one, also can be a plurality of.The capacitance of described the first electric capacity 112 is preferably the Flying Farah magnitude.Described switch 111 comprises any switch that can open/close according to default frequency, and it includes but not limited to controlled xtal pipe switch etc.Described predeterminated frequency is preferably more than 20kHz.For example, described switch 111 subject clock signals are opened/are closed.
Described the second electric capacity 12 is connected with described impedance unit by described switch 111, is used for filtering high-frequency electric wave.Wherein, adjacent described switch is alternately opened/is closed.The capacitance of described the second electric capacity 12 is preferably in the picofarad magnitude, to filter high-frequency noise.
Wherein, adjacent described switch 111 mode alternately opening/close includes but not limited to:
1) all described switches 111 according to identical frequency but different step open/close.For example, as shown in Figure 3, the frequency of the described switch 111 in all described impedance units 11 is 40kHz, and the described switch 111 in three described impedance units 11 is opened one by one/closed in a time cycle 0.25ms, opens/closes with different step.
The described switch 111 of 2) being separated by act in agreement and adjacent described switch 111 steps opposite.For example, as shown in Figure 3, the frequency of the described switch 111 in all described impedance units 11 is identical, first and third described switch 111 is all opened/is closed to open first the step of closing afterwards from described power output end, and 111 steps with make-before-break of second, four described switch are opened/closed.
Particularly, described impedance unit 11 is one, and it comprises: switch 111 and a plurality of first electric capacity 112 that is subjected to the series connection of described switch control charging of opening/closing by predeterminated frequency.
For example, as shown in Figure 2, one end of the described switch 111 in the described impedance unit 11 connects described power supply 2 outputs, the other end connects described first electric capacity 112 of 5 series connection, the other end ground connection of described first electric capacity 112 of these 5 series connection, wherein, the capacitance of each described the first electric capacity 112 is 100fF, the switching frequency of described switch 111 is 40kHz, then by formula (1) can these 5 series connection the total capacitance value of described the first electric capacity 112 be 20fF, then, the quantity of electric charge that described the first electric capacity 112 of being obtained series connection by formula (2) shifts in 111 1 switching cycles at described switch, this quantity of electric charge also equals the product in electric current and a described switching cycle, such as formula (3), then, formula (3) substitution formula (4) is obtained the total capacitance value of described the first electric capacity 112 that the resistance of described impedance unit 11 equals to connect and the inverse of described switch 111 frequency product, the total resistance that namely obtains described impedance unit 11 is 1.25G Ω.
1/C=1/C
F1+ 1/C
F2+ 1/C
F3+ ... + 1/C
FnFormula (1)
Q=C*V formula (2)
It=C*V=＞I=CV/t=＞I=CVf formula (3)
R=V/I=V/ (CVf)=1/fC formula (4)
Wherein, C is the total capacitance value of the first electric capacity of series connection.
C
fBe the capacitance of described the first electric capacity 112, n is the natural number greater than 1.
Q is the total charge number of described the first electric capacity 112 of series connection.
V is the magnitude of voltage of described power supply 2 outputs.
I is the current value of described impedance unit 11 of flowing through.
T is that 111 1 on described switch is opened/the closed cycle phase.
F be described switch 111 open/close frequency.
R is the resistance value of described first electric capacity 112 of series connection.
As a kind of preferred version, described impedance unit 11 is a plurality of and is connected to one by one described power supply 2 outputs, wherein, each described impedance unit 11 all comprises described first electric capacity 112 of a switch 111 of opening/closing by predeterminated frequency and a plurality of series connection that is subjected to described switch control charging/parallel connection, described the second electric capacity 12 is connected with described impedance unit by described switch 111, wherein, adjacent described switch 111 is alternately opened/is closed.
As shown in Figure 3, described power-supply filter 1 comprises described impedance unit a1, a2 and a3, described impedance unit a1 one end is connected with power supply 2 outputs, the other end connects described impedance unit a2, the described impedance unit a2 other end connects described impedance unit a3, described the second electric capacity 12 of switch 111 connections that the other end of described impedance unit a3 opens and closes by pressing predeterminated frequency.Wherein, each described impedance unit 11 comprises a described switch 111 and is subjected to described switch to control described first electric capacity 112 of 2 series connection of charging.In this example, the capacitance of each described the first electric capacity 112 is 200fF, the frequency of each described switch 111 is 40kHz, the resistance R that then utilizes formula (1) to formula (4) can get each described impedance unit 11 is 0.25G Ω, because adjacent described switch 111 is alternately opened/is closed, then three described impedance units 11 are equivalent to 3 series resistances, so total resistance of three described impedance units 11 is 3*R=0.75G Ω.
Need to prove, those skilled in the art should understand that, the capacitance of described the first electric capacity 112 in above-mentioned a plurality of described impedance unit 11 is only for giving an example, but not to restriction of the present utility model, in fact, the capacitance of each described the first electric capacity 112 may not be necessarily identical in each impedance unit 11, and the quantity of described the first electric capacity 112 in each described impedance unit 11 also may not be identical, can select according to actual conditions.
Need to prove that also it should be appreciated by those skilled in the art that a plurality of described the first electric capacity 112 in the impedance unit 11 described above also can be in parallel, its resistance is calculated according to formula (5), formula (3), formula (4), is not described in detail in this.
C '=C '
F1+ C '
F2+ ... + C '
FnFormula (5)
Wherein, C ' is the total capacitance value of the first electric capacity of parallel connection.
C '
fBe the capacitance of described the first electric capacity 112, n is the natural number greater than 1.
As another preferred version, described power-supply filter 1 comprises a plurality of described impedance units 11, and is connected to one by one described power supply 2 outputs, described the second electric capacity 12 of switch 111 connections that last described impedance unit 11 opens and closes by pressing predeterminated frequency.Wherein, each described impedance unit 11 comprises a described switch 111 and described first electric capacity 112 that is subjected to described switch 111 control chargings, and wherein, adjacent described switch 111 is alternately opened/closed.
Need to prove, those skilled in the art should understand that, the mode that described switch 111 in the adjacent described impedance unit 11 among the mode that described switch 111 in the above-mentioned adjacent described impedance unit 11 is alternately opened/closed by default separately frequency and the embodiment one is alternately opened/closed by the frequency of presetting separately is identical or close, so be not described in detail in this.
For example, as shown in Figure 4, comprise 6 described impedance units 11 that are connected to one by one described power supply 2 outputs in the described power-supply filter 1, described the second electric capacity 12 of switch 111 connections that last described impedance unit 11 opens and closes by pressing predeterminated frequency, each described impedance unit 11 comprise a described switch 111 and described first electric capacity 112 that is subjected to described switch 111 control chargings.Wherein, the frequency of described switch 111 is 40kHz, the capacitance of described the first electric capacity 112 is 100fF, the resistance R that then utilizes formula (1) to formula (4) can get each described impedance unit 11 is 0.25G Ω, owing to the described switch 111 in these 6 the described impedance units 11 is alternately opened/closed, then these 6 described impedance units 11 are equivalent to 6 series resistances, so total resistance of 6 described impedance units 11 is 6*R=1.5G Ω.
Need to prove, those skilled in the art should understand that, the capacitance of described the first electric capacity 112 in above-mentioned a plurality of impedance unit 11 is only for giving an example, but not to restriction of the present utility model, in fact, the capacitance of each described the first electric capacity 112 may not be necessarily identical in each impedance unit 11, and the quantity of each described the first electric capacity 112 in each described impedance unit 11 also may not be identical, can select according to actual conditions.
In sum, power-supply filter that can be integrated described in the utility model utilizes described first electric capacity of a plurality of Flying Farah magnitudes to consist of the resistance of G magnitude, can greatly reduce filter resistor shared area in chip; In addition, adopt described the first electric capacity to consist of high resistance measurement in the filter, be conducive to reduce the noise that element itself produces; In addition, only adopt described switch and described the first electric capacity to consist of impedance unit in the filter circuit, greatly reduce the manufacture difficulty of integrated filter, be conducive to be applied in the microcircuit; Also have, the frequency of described switch can avoid described switch on the impact of voice signal more than 20kHz.So the utility model has effectively overcome various shortcoming of the prior art and the tool high industrial utilization.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not is used for restriction the utility model.Any person skilled in the art scholar all can be under spirit of the present utility model and category, and above-described embodiment is modified or changed.Therefore, have in the technical field under such as and know that usually the knowledgeable modifies or changes not breaking away from all equivalences of finishing under spirit that the utility model discloses and the technological thought, must be contained by claim of the present utility model.
Claims (8)
- One kind can be integrated power-supply filter, it is characterized in that, comprise at least:The impedance unit that at least one is connected with power output end, wherein, described impedance unit comprises that a switch of opening/closing by predeterminated frequency and at least one are subjected to the first electric capacity of described switch control charging;The second electric capacity that is connected with described impedance unit by described switch;Wherein, adjacent described switch is alternately opened/is closed.
- 2. power-supply filter that can be integrated according to claim 1 is characterized in that, described impedance unit comprises: the first electric capacity of switch of opening/closing by predeterminated frequency and a plurality of series connection that is subjected to described switch control charging/parallel connection.
- 3. power-supply filter that can be integrated according to claim 2 is characterized in that, described impedance unit is a plurality of, and is connected to one by one described power output end.
- 4. power-supply filter that can be integrated according to claim 1, it is characterized in that, described impedance unit is a plurality of and is connected to one by one described power output end, wherein, each described impedance unit comprises switch and first electric capacity that is subjected to described switch control charging of opening/closing by predeterminated frequency.
- 5. power-supply filter that can be integrated according to claim 1 is characterized in that, the described switch of being separated by act in agreement and the step of adjacent described switch opposite.
- 6. power-supply filter that can be integrated according to claim 1 is characterized in that, all described switches according to identical frequency but different step open/close.
- 7. power-supply filter that can be integrated according to claim 1 is characterized in that, described switch open/close frequency greater than 20KHz.
- 8. power-supply filter that can be integrated according to claim 1 is characterized in that, the capacitance of described the first electric capacity is in the Flying Farah magnitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220376037 CN202798438U (en) | 2012-07-31 | 2012-07-31 | Integratable power filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220376037 CN202798438U (en) | 2012-07-31 | 2012-07-31 | Integratable power filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202798438U true CN202798438U (en) | 2013-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220376037 Expired - Fee Related CN202798438U (en) | 2012-07-31 | 2012-07-31 | Integratable power filter |
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| Country | Link |
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| CN (1) | CN202798438U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103580459A (en) * | 2012-07-31 | 2014-02-12 | 无锡市葆灵电子科技有限公司 | Integratable power filter |
-
2012
- 2012-07-31 CN CN 201220376037 patent/CN202798438U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103580459A (en) * | 2012-07-31 | 2014-02-12 | 无锡市葆灵电子科技有限公司 | Integratable power filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20160731 |