CN106130502B - Based on on-off modulated voltage controlled voltage source type rank than filter circuit and design method - Google Patents
Based on on-off modulated voltage controlled voltage source type rank than filter circuit and design method Download PDFInfo
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- CN106130502B CN106130502B CN201610430345.XA CN201610430345A CN106130502B CN 106130502 B CN106130502 B CN 106130502B CN 201610430345 A CN201610430345 A CN 201610430345A CN 106130502 B CN106130502 B CN 106130502B
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- switch
- resistance
- amplifier
- module structure
- serial module
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/04—Frequency selective two-port networks
- H03H11/12—Frequency selective two-port networks using amplifiers with feedback
- H03H11/1291—Current or voltage controlled filters
Abstract
The present invention provides one kind to switch serial module structure, resistance R than filter circuit and manufacturing method, including control signal input, first resistor switch serial module structure, second resistance based on on-off modulated voltage controlled voltage source type rank3, resistance R4, capacitor C1, capacitor C2And amplifier.Circuit of the present invention has rank than filter function, only needs common amplifier and resistance capacitance that circuit design can be completed；The input reference signal of circuit of the present invention is only decided by the operating voltage of amplifier, and if the operating voltage of amplifier is ± 15V, then input reference signal approaches ± 15V.The configuration of the present invention is simple, design are convenient.
Description
Technical field
The present invention relates to electronic technology, and in particular, to one kind is based on on-off modulated voltage controlled voltage source type rank than filtering
Circuit and design method.
Background technique
In the vibration of rotary machine and the test of noise signal, constant duration is generally used to the case where uniform rotation
It samples and carries out conventional spectrum analysis.But during rotation speed change, then constant duration sampling meeting is so that frequency on spectrogram
Component thickens.For that purpose it is necessary to using etc. angles of revolution sample sequence analyze signal, i.e., so-called order ratio analysis.
Assuming that being E to the sampling number that rotary machine often revolves one-turnS, according to order sampling theorem, to avoid aliasing,
Before order sampling E must be filtered out in signalSThe ingredient of/2 or more orders.Obviously, cutoff frequency low-pass is determined according to general
Wave mode can then bring following problems when the variation range of revolving speed is larger: under a certain cutoff frequency, when low speed, in ES/2
Nearby it is likely to occur aliasing；When high speed, then it is abundant interested signal may be filtered again.Therefore optimal filtering mode is to make
The cutoff frequency f of filtercWith revolving speed linear change, i.e.,
fc=fnEc (1)
In formula, fnFrequency corresponding to revolving speed for rotating machinery, EcTo end order.This filter is known as rank than filter
Wave device.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide one kind to be based on on-off modulated voltage controlled voltage source type
Rank is than filter circuit and design method.
What is provided according to the present invention is more defeated than filter circuit, including control signal based on on-off modulated voltage controlled voltage source type rank
Enter end, first resistor switch serial module structure, second resistance switch serial module structure, resistance R3, resistance R4, capacitor C1, capacitor C2And
Amplifier；
Wherein, one end of first resistor switch serial module structure connects input signal, and the other end passes through second resistance switch series
Gang mould block connects the non-inverting input terminal of the amplifier；
Capacitor C1One end connection first resistor switch serial module structure one end, the other end connects the output of the amplifier
End；Capacitor C2One end connect the non-inverting input terminal of the amplifier, other end ground connection；
Resistance R3One end connect the output end of the amplifier, the other end connects the inverting input terminal of the amplifier, resistance R4
One end, resistance R4The other end ground connection；
Control signal input connects control terminal, the second resistance switch series of switch S1 in first resistor switch serial module structure
The control terminal for joining module switch S2, for controlling switch S1, second resistance switch series gang mould in first resistor switch serial module structure
Block switch S2 on-off.
Preferably, the first resistor switch serial module structure includes resistance R1, switch S1；The second resistance switch series connection
Module includes resistance R2, switch S2；
Wherein, the resistance R1One end connection switch S1 one end, one end of the other end connection switch S2 of switch S1,
The other end of switch S2 connects resistance R2One end, resistance R2The other end connect the non-inverting input terminal of the amplifier；
Capacitor C1One end connect the other end of the switch S1.
Preferably, the first resistor switch serial module structure includes resistance R1, switch S1；The second resistance switch series connection
Module includes resistance R2, switch S2；
Wherein, the resistance R1One end connection switch S1 one end, the other end of switch S1 connects resistance R2One end,
Resistance R2Other end connection switch S2 one end, the other end of switch S2 connects the non-inverting input terminal of the amplifier；
Capacitor C1One end connect the other end of the switch S1.
It is provided by the invention based on on-off modulated voltage controlled voltage source type rank than filter circuit design method, following steps:
Step S1: selected parameter n determines full turn-on frequency fTWith full conducting angular frequencyT, wherein switch control signal
Frequency is n times for being integrated signal frequency；
Step S2: the model of amplifier is determined；It determines each capacitor and each resistance value, makesQuality factorDirect current amplification factor
Step S3: according to being integrated signal frequency fnDetermine the cycle T of pulse-width modulation control signal；Pulse width modulation controlled letter
Number periodWherein, turn-on time is
Preferably, step S2 includes the following steps:
Step S201: selected R3、C1；
Step S202: k=2 π f is enabledTC1,
Step S203: each capacitor and each resistance value, C are determined2=mC1,
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, circuit of the present invention has rank than filter function, only needs common amplifier and resistance capacitance that circuit design can be completed；
2, the input reference signal of circuit of the present invention is only decided by the operating voltage of amplifier, as amplifier operating voltage be ±
15V, then input reference signal approaches ± 15V.
3, the configuration of the present invention is simple, design are convenient.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is a kind of structural schematic diagram in the present invention based on on-off modulated voltage controlled voltage source type rank than filter circuit；
Fig. 2 is another structural representation in the present invention based on on-off modulated voltage controlled voltage source type rank than filter circuit
Figure.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
As shown in Figure 1, rabbeted in multiple feedback low-pass filter circuit in the present invention two simulant electronic switch S1 and
S2.Switch S1 and S2 can control its open or close by the way that control signal is added in control terminal C.In the present invention it is assumed that
Logic high is connect in C-terminal, is closed the switch, and connects logic low in C-terminal, switch disconnects.
Working principle in the present invention based on on-off modulated voltage controlled voltage source type rank than filter circuit are as follows:
For the present invention by inputting suitable pulse-width signal in control terminal C, control simulant electronic switch S1's and S2 is logical
It is disconnected, change resistance R1、R2Equivalence value, to change the input-output characteristic of circuit.As shown in Figure 1, being T in the C-terminal input period
Control signal, the time closed the switch in one cycle be TT, TTFor the fixed value designed according to needs, then in cycle T
Interior resistance R1Equivalent average value R1eFor
In formula, TTFor the time of switch control conducting, fix；T is the period of switch control signal.Vacation is so that at one
The equivalence value of period internal feedback resistance is constant as far as possible, and the frequency that can use switch control signal is n times for being integrated signal frequency, root
According to test result, n > 100 are generally taken.Then have
In formula, fcIt is rank than cutoff frequency, ωcIt is rank than cut-off angular frequency, fT、ωTReferred to as full turn-on frequency, full conducting
Angular frequency is fixed value.Obviously, when signal frequency is fTWhen, R1eAs R1。
Similarly, R2Equivalence value be
It can be obtained Fig. 1 circuit input-output characteristic H (s) by being analyzed above and be
By formula (4) it is found that Fig. 1 circuit has low-pass characteristic, and cutoff frequency ω0For
Quality factor q is
Direct current amplification factor A is
If takenThen cutoff frequency, quality factor, direct current amplification factor are respectively
By formula (8) it is found that the direct current amplification factor A and quality factor Q of Fig. 1 circuit not with by rank than cutoff frequency ωcHair
Changing is fixed value.The cutoff frequency of circuit can change than cutoff frequency with rank and be changed, therefore Fig. 1 circuit has rank ratio
The function of filtering.
In the design method of voltage controlled voltage source type low-pass filter circuit in the present invention, can be designed in accordance with the following steps:
(1) parameter n is selected, determines full turn-on frequency and full conducting angular frequency fT、ωT.Full turn-on frequency determines circuit
Maximum cut-off.
(2) model for determining amplifier selects suitable amplifier according to the purposes used, and general fortune can be used in alternation rule
Put selection rule.It determines each capacitor and each resistance value, makes to meet The determination method of component parameters are as follows:
1) R is selected3、C1
2) k=2 π f is enabledTC1,
3) computing element parameter:
(3) basis is integrated signal frequency fnDetermine the cycle T of pulse-width modulation control signal.Pulse-width modulation control signal
PeriodIn formula, fcCutoff frequency for rank than filter circuit, EcCut-off order for rank than filter circuit；
The turn-on time of pulse-width modulation control signal is
In one more specifically embodiment, the highest working speed of certain rotor is 30000r/min, corresponding rotation
Frequency is 500Hz, and taking cut-off order is Ec=2, working rotor is in 15000r/min.Use circuit design rank of the present invention than filter
Wave circuit, design objective are as follows: the cutoff frequency of circuit changes with rotor rotation frequency, quality factor 0.5, direct current amplification factor
It is 2.
Design method: (1) due to fmax=500Hz, cut-off order are Ec=2, therefore the maximum cut-off of circuit is fT
=fmax×Ec=(500 × 2) Hz=1000Hz.Take n=100.
(2) selecting amplifier is AD711, chooses R3=1k Ω, C1=0.1 μ F, is computed: k=6.2832 × 10-4, m=
2.Remaining component parameters is calculated as C2=0.2 μ F, R1=1.5915k Ω, R2=795.7747 Ω, R4=1k Ω.By element circle
It is whole to arrive nominal value: C1=0.1 μ F, C2=0.2 μ F, R1=1.6k Ω, R2=820 Ω, R3=1k Ω, R4=1k Ω.
It is calculated, is calculated according to nominal value
(3) for working rotor in 15000r/min, corresponding frequency is 250Hz, the period of pulse-width modulation control signalWherein turn-on time is
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (4)
1. one kind compares filter circuit based on on-off modulated voltage controlled voltage source type rank, which is characterized in that including control signal input
End, first resistor switch serial module structure, second resistance switch serial module structure, resistance R3, resistance R4, capacitor C1, capacitor C2And fortune
It puts；
Wherein, one end of first resistor switch serial module structure connects input signal Ui(s), the other end passes through second resistance switch series
Gang mould block connects the non-inverting input terminal of the amplifier；
Capacitor C1One end connection first resistor switch serial module structure the other end, the other end connects the output end of the amplifier；Electricity
Hold C2One end connect the non-inverting input terminal of the amplifier, other end ground connection；
Resistance R3One end connect the output end of the amplifier, the other end connects the inverting input terminal of the amplifier, resistance R4One
End, resistance R4The other end ground connection；
Control signal input connects the control terminal of switch S1, second resistance switch series gang mould in first resistor switch serial module structure
The control terminal of block switch S2, for controlling switch S1 in first resistor switch serial module structure, second resistance switch serial module structure is opened
Close S2 on-off.
2. according to claim 1 compare filter circuit based on on-off modulated voltage controlled voltage source type rank, which is characterized in that institute
Stating first resistor switch serial module structure includes resistance R1, switch S1；The second resistance switch serial module structure includes resistance R2, open
Close S2；
Wherein, the resistance R1One end connection switch S1 one end, the resistance R1The other end connect input signal Ui(s)；
The other end of one end of the other end connection switch S2 of switch S1, switch S2 connects resistance R2One end, resistance R2The other end connect
Connect the non-inverting input terminal of the amplifier；
Capacitor C1One end connect the other end of the switch S1.
3. according to claim 1 compare filter circuit based on on-off modulated voltage controlled voltage source type rank, which is characterized in that institute
Stating first resistor switch serial module structure includes resistance R1, switch S1；The second resistance switch serial module structure includes resistance R2, open
Close S2；
Wherein, the resistance R1One end connection switch S1 one end, the resistance R1The other end connect input signal Ui(s)；
The other end of switch S1 connects resistance R2One end, resistance R2Other end connection switch S2 one end, the other end of switch S2 connects
Connect the non-inverting input terminal of the amplifier；
Capacitor C1One end connect the other end of the switch S1.
4. based on on-off modulated voltage controlled voltage source type rank than filter circuit described in a kind of any one of claims 1 to 3
Design method, which is characterized in that following steps:
Step S1: selected parameter n determines full turn-on frequency fTWith full conducting angular frequencyT, wherein the frequency of switch control signal
For n times for being integrated signal frequency；
Step S2: the model of amplifier is determined；It determines each capacitor and each resistance value, makesQuality factorDirect current amplification factorThe determination method of component parameters are as follows:
1) R is selected3、C1
2) k=2 π f is enabledTC1,
3) computing element parameter:
Step S3: according to being integrated signal frequency fnDetermine the cycle T of pulse-width modulation control signal；Pulse-width modulation control signal
PeriodIn formula, fcCutoff frequency for rank than filter circuit, EcCut-off order for rank than filter circuit；
The turn-on time of pulse-width modulation control signal is
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|---|---|---|---|
| CN201610430345.XA CN106130502B (en) | 2016-06-16 | 2016-06-16 | Based on on-off modulated voltage controlled voltage source type rank than filter circuit and design method |
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| CN106130502B true CN106130502B (en) | 2019-05-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2813368C1 (en) * | 2023-11-14 | 2024-02-12 | федеральное государственное бюджетное образовательное учреждение высшего образования "Донской государственный технический университет" (ДГТУ) | Discrete-analogue low-pass filter on switched capacitors |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178800A (en) * | 2013-02-22 | 2013-06-26 | 上海交通大学 | Switch modulation based dual-operational-amplifier tracking filter circuit and design method thereof |
| CN103199819A (en) * | 2013-03-05 | 2013-07-10 | 上海交通大学 | Voltage controlled voltage source type tracking filter circuit based on switch modulation and design method thereof |
| CN103259500A (en) * | 2013-04-17 | 2013-08-21 | 上海辛克试验机有限公司 | Tracking filter circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4476791B2 (en) * | 2004-11-26 | 2010-06-09 | 新日本無線株式会社 | Electronic volume |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178800A (en) * | 2013-02-22 | 2013-06-26 | 上海交通大学 | Switch modulation based dual-operational-amplifier tracking filter circuit and design method thereof |
| CN103199819A (en) * | 2013-03-05 | 2013-07-10 | 上海交通大学 | Voltage controlled voltage source type tracking filter circuit based on switch modulation and design method thereof |
| CN103259500A (en) * | 2013-04-17 | 2013-08-21 | 上海辛克试验机有限公司 | Tracking filter circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2813368C1 (en) * | 2023-11-14 | 2024-02-12 | федеральное государственное бюджетное образовательное учреждение высшего образования "Донской государственный технический университет" (ДГТУ) | Discrete-analogue low-pass filter on switched capacitors |
| RU2813369C1 (en) * | 2023-11-14 | 2024-02-12 | федеральное государственное бюджетное образовательное учреждение высшего образования "Донской государственный технический университет" (ДГТУ) | Discrete-analogue filter with three earthed capacitors |
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| CN106130502A (en) | 2016-11-16 |
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