CN104578754B - For the wave filter of power type electromagnetic interference of preventing - Google Patents
For the wave filter of power type electromagnetic interference of preventing Download PDFInfo
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- CN104578754B CN104578754B CN201410804315.1A CN201410804315A CN104578754B CN 104578754 B CN104578754 B CN 104578754B CN 201410804315 A CN201410804315 A CN 201410804315A CN 104578754 B CN104578754 B CN 104578754B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
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Abstract
The present invention relates to a kind of wave filter for power type electromagnetic interference of preventing, it is electrically coupled between the power supply line of master chip and load end, because master chip is produced output voltage noise and output current noise by after electricity by the running of internal circuit, and there is therebetween a phase difference.One level reference circuit produces the first level reference signal according to the output voltage noise or output current noise of master chip.After one chopped-off head filter circuit carries out calculating of the voltage with current characteristic vector value according to the first level reference signal, one second level reference signal is exported.Level filter circuit carries out the calculating of voltage and current characteristic vector value according to the second level reference signal, to eliminate output voltage noise and output current noise, and its phase difference is leveled off to zero.Thereby, load termination receives the output voltage after filtering noise and current signal.
Description
Technical field
The present invention relates to a kind of electromagnetic interference rejects trap；Especially with regard to one kind using chopped-off head filter circuit and secondary
Filter circuit is with the rejects trap of the electromagnetic interference of power end of preventing.
Background technology
Design based on electron product circuit substrate (printed circuit board, PCB) will face many signals
Carry, the superposition (superposition) of various resonance (harmonic) frequencies, the quality except influenceing signal also results in letter
Interference number and between signal.And in addition to problem of the arch-criminal of interference signal more than, be even more in power end and be coupled complexity
Resonant frequency ripple is also one of main problem.The source of these frequency waves is produced, it is main to come from main feature collection
Into the running of circuit chip (main functional IC) internal circuit, in this, these resonance waves are even more and cause electronic product
The main source of electromagnetic interference (electromagnetic interference), is currently known electric capacity and various forms wave filter
Mainly to solve the problems, such as the instrument of EMI now.
However, on circuit substrate (PCB), signal integrity (signal integrity, SI) and Power Integrity
The design of (power integrity, PI) must fully grasp master chip circuit characteristic and system board characteristic, and boundary condition
Setting.But this is in the today being finer division of labour, become extremely difficult.In order to reach such co-simulation (co-
Simulation) design, it is single for system designer, it is the information for being difficult the complete chip characteristics of acquirement, and chip is designed
Person is also only capable of being designed with regard to its characteristics of signals, and obtains preferably specificity analysis, for the problem for being connected to system, with respect to master degree
Also it is not high.And the characteristic part of the resonant frequency noise of power supply, either system design end or chip design end, are all one
Problem unknown and without solution, sets about to go to evade in the setting of the logic circuit being at most only capable of in master chip.In addition, permitted
Under the price competition fierceness of polyelectron product, the design of circuit substrate is reduced to four laminates by six laminates, and four laminates are reduced to two laminates,
In the case, the design of Power Integrity (PI) more seems addition difficult, and existing usable filtering unit element is obviously
It is not inconsistent and uses, therefore industry faces the noise and EMI problems on power end at present, the method for its treatment is still only capable of utilizing mostly
The at a fairly low trial and error of efficiency (try and error) mode is carried out, and economic and cost benefit is not met quite.
Furthermore, due to the EMI problems of power end take place mostly in power supply the resonant noise of some CF and its
The mutual coupling of his noise waves, it under big multimode is not synchronous with Small Current Signal to cause the voltage small-signal of this frequency
Traveling, and voltage noise is by after the capacitor of single-pathway, the phase of its current noise cannot be coupled completely, or even
In the case of worse, it may appear that the crest of signal to this kind of serious problem of trough to producing.Such resultant current, not only makes
Into by the way that in the power source path of circuit substrate other positions, and wire also produces the spy of stray inductance effect after this node
Property, more badly influence the chain reaction of voltage characteristic change.
So, inventor can improve thoughts on above-mentioned missing, and according to the correlation experience being engaged in for many years in this respect,
Carefully observe and study, and coordinate scientific principle to use, and propose the present invention that is a kind of novel in design and being effectively improved above-mentioned missing, its
A kind of wave filter for power type electromagnetic interference of preventing is disclosed, it is electrically coupled to electricity using this filter circuit two ends formula
Between source and main functional chip, its specific framework and implementation method will be described under.
The content of the invention
To solve the problems, such as prior art, a purpose of the invention is to provide a kind of for power type electromagnetism of preventing
The wave filter of interference, it is initiated and discloses a kind of circuit framework innovated completely, and is solved on power end by this filter circuit
The electromagnetic interference of generation and the resonant frequency ripple for coupling.
A further object of the present invention is to provide a kind of wave filter for power type electromagnetic interference of preventing, and it is using to electricity
Pressure or electric current carry out the calculating of characteristic vector value (eigenvalue), accurately match out by resistance, electric capacity and inductance wherein extremely
The filter construction of few passive device composition, is only capable of, using the practice of trial and error, more having preferably compared to existing
Economy and time cost benefit.
It is still another object of the present invention to provide a kind of wave filter for power type electromagnetic interference of preventing, it is a kind of two
The filter circuit of end formula electric property coupling, not only can effectively filter the online high-frequency noise of power supply (for example：100MHz is with up to several
GHz), also certain Power Integrity and signal integrity can be maintained while effective noise filtering excessively.
So, according to the wave filter for power type electromagnetic interference of preventing disclosed in this invention, it is electrically coupled to one
Between the power supply line of master chip and a load end.Wherein, after master chip is by power supply line supply power supply, one is produced to export
Voltage and one outputs current to the load end, and output voltage is mingled with an output voltage noise and an output respectively with output current
Current noise, and output voltage noise produces a phase difference with output current noise under the influence of the noise resonance of power supply.This hair
The bright disclosed wave filter for power type electromagnetic interference of preventing include a level reference circuit, a chopped-off head filter circuit and
Level filter circuit.
Embodiments in accordance with the present invention, level reference circuit electric property coupling master chip, and according to output voltage noise with it is defeated
Go out current noise wherein at least one and produce one first level reference signal.Chopped-off head filter circuit level reference circuit in parallel,
And receive the first level reference signal, thereby, chopped-off head filter circuit according to the first level reference signal to output voltage noise or
Output current noise carries out the calculating of characteristic vector value, to export one second level reference signal.Afterwards, secondary filter circuit connects
The second level reference signal is received, and spy is carried out to output voltage noise or output current noise according to the second level reference signal
The calculating of vector value is levied, the output voltage noise, the output current noise and the output voltage noise and the output is thereby eliminated
Phase difference between current noise, and then cause that most can receive the output voltage after filtering noise after load end believes with electric current
Number.
Still further, the present invention also optionally comprises additionally at least one first, second, third, fourth or the
Five modulation circuits, can exist simultaneously using those modulation circuits, or only set at least one of ingehious design, based on those modulations
Circuit is the characteristic being made up of resistance, electric capacity and the passive device of inductance wherein at least one, and collocation controlling switch is according to reference signal
The interdependent voltage-current characteristic for being formed, completes to calculate the characteristic vector value of output voltage electric current, thereby realizes existing power supply
The action that the noise jamming that line is produced is filtered, to reach goal of the invention of the invention.
Coordinate appended schema elaborate below by specific embodiment, when being easier to understand the purpose of the present invention, skill
Art content, feature and its effect reached.
Brief description of the drawings
Fig. 1 is the schematic diagram of the wave filter for power type electromagnetic interference of preventing according to the embodiment of the present invention；
Fig. 2 is the schematic diagram according to chopped-off head filter circuit first embodiment of the present invention；
Fig. 3 is the schematic diagram according to chopped-off head filter circuit second embodiment of the present invention；
Fig. 4 is the schematic diagram according to chopped-off head filter circuit 3rd embodiment of the present invention；
Fig. 5 is the schematic diagram according to chopped-off head filter circuit fourth embodiment of the present invention；
Fig. 6 is the schematic diagram according to secondary filter circuit first embodiment of the invention；
Fig. 7 is the schematic diagram according to secondary filter circuit second embodiment of the invention；
Fig. 8 is the schematic diagram according to secondary filter circuit 3rd embodiment of the invention；
Fig. 9 is that the filter internal detailed circuit according to one embodiment of the invention for power type electromagnetic interference of preventing is illustrated
Figure；
Figure 10 is the schematic diagram for the wave filter of power type electromagnetic interference of preventing according to further embodiment of this invention；
Figure 11 is the schematic diagram for the wave filter of power type electromagnetic interference of preventing according to another embodiment of the present invention；
Figure 12 is the schematic diagram for the wave filter of power type electromagnetic interference of preventing according to yet another embodiment of the invention.
Description of reference numerals：Wave filters of the 1- for power type electromagnetic interference of preventing；10- master chips；20- load ends；
100- level reference circuits；200- chopped-off head filter circuits；The controlling switches of 201- first；The modulation circuits of 210- first；220- second
Modulation circuit；300- level filter circuit；The controlling switches of 301- second；The modulation circuits of 310- the 3rd；The modulation circuits of 320- the 4th；
The modulation circuits of 500- the 5th；The modulation circuits of 600- the 6th.
Specific embodiment
Present disclosure explanation is more than related to, is used to demonstrate with following implementation method and is explained spirit of the invention
With principle, and scope of patent protection of the invention is provided further explains.Feature for the present invention, implementation and work(
Effect, hereby coordinates schema to make preferred embodiment detailed description as follows.
Refer to shown in Fig. 1, it is the wave filter for power type electromagnetic interference of preventing according to the embodiment of the present invention
Schematic diagram.As shown in figure 1, the wave filter 1 for power type electromagnetic interference of preventing disclosed in this invention is electrically coupled to a master
Between the power supply line VDD of chip 10 and a load end 20, wherein, the master chip 10 supplies electricity by its power supply line VDD
Behind source, an output voltage and output current are produced, it is mingled with output voltage noise V (t) and an output current noise I respectively
(t), wherein, the relation of small-signal, this output voltage noise V (t) and output current noise I (t) are influenceed due to power supply resonance
Can there is a phase difference Φ between waveformC, the wave filter 1 for power type electromagnetic interference of preventing disclosed in this invention is mainly
This phase difference Φ that preventsC, and control output voltage noise V (t) passing through this electricity of preventing with output current noise I (t)
The traveling of minimum up to intensity and synchronous (Synchronous) after the filter action of the wave filter 1 of source formula electromagnetic interference, therefore
When received by load end 20, voltage signal V as illustrated in the drawingoc(t) and current signal IP(t) can for one kind filter out it is small
The voltage and current signal of signal noise.
Specifically, the wave filter 1 for power type electromagnetic interference of preventing disclosed in this invention, it mainly includes one
Quasi- reference circuit 100, a chopped-off head filter circuit 200 and a level filter circuit 300.Wherein, the electricity of level reference circuit 100
Property be coupled to master chip 10, and produced according to output voltage noise V (t) and output current noise I (t) therein at least one
One first level reference signal R (t).In other words, when the signal that level reference circuit 100 is captured is output voltage noise V
T when (), the first level reference signal R (t) that it is exported is a voltage signal.Relatively, when level reference circuit 100 is picked
When the signal got is output current noise I (t), then the first level reference signal R (t) for being exported is then a current signal,
All may be used to implement technological means of the invention.
Chopped-off head filter circuit 200 is parallel to the level reference circuit 100, and receives the of the offer of level reference circuit 100
One level reference signal R (t).Under this situation, chopped-off head filter circuit 200 can be according to the first level reference signal R (t) to this
Output voltage noise V (t) or output current noise I (t) carry out the calculating of characteristic vector value (Eigenvalue), thus export again
One second level reference signal S (t).Afterwards, secondary filter circuit 300 receives second level reference signal S (t), and foundation
Second level reference signal S (t) continues to carry out characteristic vector value to output voltage noise V (t) or output current noise I (t)
(Eigenvalue) calculating, thereby to adjust the phase difference between output voltage noise V (t) and output current noise I (t)
ΦCSo that this phase difference ΦCZero can be little by little leveled off to, while these small-signals triggered by power supply resonance of preventing are made an uproar
Sound.Finally, in the signal V received by load end 20oc(t) and IPT () can be to filter voltage and electric current after noise jamming
Signal.
First, refer to shown in Fig. 2 to Fig. 5, it is four kinds of different implementation aspects of chopped-off head filter circuit 200 of the present invention.
Wherein, chopped-off head filter circuit 200 includes one first controlling switch 201 and at least one first modulation circuit 210, and the first control is opened
Close 201 mutually to be concatenated with the first modulation circuit 210, and be coupled between power supply line VDD and earth terminal VSS.Wherein,
One controlling switch 201 is electrically connected at the level reference circuit 100, to receive first from level reference circuit 100
Quasi- reference signal R (t).The position in circuit is connected to as the first modulation circuit 210, can be with as shown in Fig. 2 the first modulation be electric
The set location on road 210 may be selected to be located between the first controlling switch 201 and power supply line VDD.Or, as shown in figure 3, the
The set location of one modulation circuit 210 may be selected to be located between the first controlling switch 201 and earth terminal VSS, with by the first modulation
Circuit 210 exports and carries out the second level reference signal S (t) of gained after characteristic vector value calculating and give secondary filter circuit 300.Or
Person, can also comprise additionally at least one second modulation circuit 220 in chopped-off head filter circuit 200, itself and first controlling switch
201st, the first modulation circuit 210 is concatenated, and forms the first controlling switch 201, the first modulation circuit 210 and the second modulation circuit 220
Three is serially connected the embodiment (ginseng Fig. 4 and Fig. 5) between power supply line VDD and earth terminal VSS.In the reality of Fig. 4 and Fig. 5
Apply in example, then the second level reference signal S (t) may be selected to be exported by the first modulation circuit 210 or the second modulation circuit 220, change
Yan Zhi, secondary filter circuit 300 may be selectively coupled to the modulation circuit 220 of the first modulation circuit 210 or second, to receive
From the reference signal that the first modulation circuit 210 or the second modulation circuit 220 are exported, in terms of carrying out characteristic vector value accordingly
Calculate.
Then, refer to shown in Fig. 6 to Fig. 8, three kinds of different implementation states of its explanation present invention secondary filter circuit 300
Sample.Wherein, secondary filter circuit 300 includes one second controlling switch 301 and at least one the 3rd modulation circuit 310, the second control
System switch 301 is mutually concatenated with the 3rd modulation circuit 310, and is coupled between power supply line VDD and earth terminal VSS.Its
In, the second controlling switch 301 is electrically connected at the chopped-off head filter circuit 200, to receive from chopped-off head filter circuit 200
Two levels reference signal S (t).The position in circuit is connected to as the 3rd modulation circuit 310, can be with as shown in fig. 6, the 3rd adjusts
The set location for becoming circuit 310 may be selected to be located between the second controlling switch 301 and power supply line VDD.Or, such as Fig. 7 institutes
Show, the set location of the 3rd modulation circuit 310 may be selected to be located between the second controlling switch 301 and earth terminal VSS.Except this it
Outward, another embodiment of the invention, as shown in figure 8, then can also comprise additionally at least the 4th in secondary filter circuit 300
Modulation circuit 320, it is concatenated with second controlling switch 301, the 3rd modulation circuit 310, the second controlling switch 301 of formation,
3rd modulation circuit 310 and the three of the 4th modulation circuit 320 are serially connected between power supply line VDD and earth terminal VSS
Embodiment.
Thus, based on first, second modulation circuit 210,220 in chopped-off head filter circuit 200 and secondary filter circuit 300
In the three, the 4th modulation circuits 310,320 be respectively and be made up of resistance, electric capacity and an inductance at least passive device therein
Circuit framework, then upper first, second controlling switch 201,301 of arranging in pairs or groups voltage-current characteristic and first, second level reference
Signal R (t), S (t), the present invention can pass through the running of those circuits, and complete to carry out the noise jamming of the online generation of power supply
The purpose of filtering.
Hereinafter, the present invention will disclose detailed circuit composition of its inside and saying for its start principle for embodiment therein
It is bright, in order to describing and understanding the technology of calculating characteristic vector value of the present invention in detail, it is confirmed that the present invention can lead to really
Ingehious design chopped-off head filter circuit 200 is crossed with secondary filter circuit 300 to reach the purpose of the online noise jamming of power supply of preventing.Please
Simultaneously refering to shown in Fig. 1, Fig. 9, it is one embodiment of the invention detailed for the inside of the wave filter of power type electromagnetic interference of preventing
Thin circuit diagram.Wherein, level reference circuit 100 includes one group of reference capacitance C0 being serially connected and reference resistance R0, first
Level filter circuit 200 includes one first controlling switch 201, a first resistor R1 and one first electric capacity C1, wherein the first control
Switch 201 is coupled to the connecting node (joint node) of reference capacitance C0 and reference resistance R0；First resistor R1 is coupled to
Between power supply line VDD and the first controlling switch 201；First electric capacity C1 is coupled to the first controlling switch 201 and ground wire VSS
Between.Secondary filter circuit 300 includes one second controlling switch 301, a second resistance R2 and one second electric capacity C2, wherein the
Two controlling switches 301 are coupled to the connecting node of first resistor R1 and the first controlling switch 201；Second resistance R2 is coupled to power supply
Between supply line VDD and the second controlling switch 301；Second electric capacity C2 be coupled to the second controlling switch 301 and ground wire VSS it
Between.In this embodiment, chopped-off head filter circuit 200 includes one first modulation circuit 210 (i.e. the first resistor R1), and one the
Two modulation circuits 220 (i.e. the first electric capacity C1)；Secondary filter circuit 300 includes one the 3rd modulation circuit 310 (i.e. second electricity
Resistance R2), and one the 4th modulation circuit 320 (i.e. the second electric capacity C2).
Wherein, for example can be N-type gold oxygen half as the element of the first controlling switch 201 and the second controlling switch 301
Field-effect transistor (metal oxide semiconductor, MOS), p-type metal-oxide half field effect transistor (PMOS) or two-carrier
Junction transistor (bipolar junction transistor, BJT) etc..But, first can be received from level reference circuit
Level reference signal, and the second level reference signal is received from chopped-off head filter circuit, so as to form interdependent voltage or electricity
The controlling switch of stream all may be used to implement the present invention.The present embodiment is said as an example using N-type metal-oxide half field effect transistor
It is bright, so it is not limited to the present invention.
Embodiments in accordance with the present invention, by taking N-type metal-oxide half field effect transistor as an example, then this first, second controlling switch
201st, 301 gate can be respectively connecting to any of which point in level reference circuit 100 (for example：Reference capacitance C0 and reference
The connecting node of resistance R0), or first resistor R1 and the first controlling switch 201 connecting node, as its switch gate
Reference voltage Vgs1(t)、Vgs2(t), and note controlling its bias value to control this N-type metal-oxide half field effect transistor to be operable in
Different operating areas, for example：Linear zone (or non-saturated region (non-saturation region)), saturation region or active
Area etc..Now, the current switch that this N-type metal-oxide half field effect transistor is coupled as same voltage, its conducting electric current
Become with reference voltage.The present invention is the voltage electricity that different operating region is located at using this N-type metal-oxide half field effect transistor
Properties of flow produces a nonlinear equation, due to the three-circuit electric current I of branchc0(t)、Ic1(t)、Ic2(t), by N-type MOSFET
The characteristic of transistor makes it have dependence (dependency), and cause the answer of quadratic equation for a conic section with it is straight
The common factor solution of line, by the coefficient of those passive device values in appropriate adjustment circuit, you can make it have solution, along with being believed by voltage
Number VocT () can orient ioAnd voCircuit equation relation, in the present embodiment by N-type metal-oxide half field effect transistor active element
Adjusted by the calculating of characteristic vector value (Eigenvalue) by the chopped-off head filter circuit that part is controlled and secondary filter circuit
The value of whole those passive devices is to control signal ioAnd voFluctuation behavior reach minimum, its computing formula can be according to following
Formula (1)~(17) are carried out.
I (t)=I0+i0ejwt (1)
Ic(t)=Ic0(t)+Ic1(t)+Ic2(t) (4)
Ic0(t)=f0(VOC,w) (7)
Ic1(t)=f1(VOC,Ico,w) (12)
vgs2(t)=vDS1(t)+VC1(t)(14)
Ic2(t)=f2(VOC,Ic1,w) (17)
Wherein, Ic0(t)、Ic1(t)、Ic2T () is respectively and flows through reference capacitance C0, first resistor R1 and second resistance R2
Current value；VC0(t)、VC1(t)、VC2(t)、VL1(t)、VL2(t) be respectively reference capacitance C0, the first electric capacity C1, the second electric capacity C2,
Inductance L1 and the cross-pressure value at inductance L2 two ends；μn、Cox、W1、L1、W2、L2The N-type MOSFET of respectively the first controlling switch
The transistor parameter of the N-type metal-oxide half field effect transistor of the controlling switch of transistor AND gate second.Therefore, according to above formula (1)~(17)
Result of calculation, based on IC(t)=f (Voc, w), solve phase difference ΦCI when being zerooAnd voSolution, you can design the present invention
A kind of disclosed wave filter for power type electromagnetic interference of preventing.In practice, designer also can be used simulation software (example
Such as：SPICE) the common factor solution of above formula (1)~(17) is tried to achieve, thereby modulation reference capacitance C0, reference resistance R0, first resistor
The value of R1, the first electric capacity C1, second resistance R2 and the second electric capacity C2, is meeting phase difference ΦCWhen being zero, that is, represent those
An effective power type EMI FILTER, power down source of fully preventing are formed by the filter circuit that passive device is constituted
Online resonant noise, control filters small scale ripple, the mesh synchronous to realize completing voltage, current signal that master chip exports
's.
In addition, the wave filter for power type electromagnetic interference of preventing disclosed in this invention is except comprising the above
Beyond level reference circuit 100, chopped-off head filter circuit 200 and secondary filter circuit 300, can also further comprising at least 1 the
Five modulation circuits 500 and/or at least one the 6th modulation circuit 600, embodiment is with reference to shown in Figure 10~Figure 12 of the present invention.Its
In, Figure 10 is the wave filter for power type electromagnetic interference of preventing also comprising one the 5th modulation circuit 500, and the 5th modulation electricity
Road 500 is serially connected with chopped-off head filter circuit 200 and secondary filter circuit 300, to be connected to power supply line VDD, chopped-off head filtered electrical
Embodiment between road 200 and secondary filter circuit 300；Figure 11 is to include one for the wave filter of power type electromagnetic interference of preventing
Five modulation circuits 500, and the 5th modulation circuit 500 is serially connected with chopped-off head filter circuit 200, secondary filter circuit 300 and ground connection
Embodiment between the VSS of end；As for Figure 12 is then the wave filter for power type electromagnetic interference of preventing while including one the 5th tune
Become the embodiment of the modulation circuit 600 of circuit 500 and the 6th, wherein, it is the 5th modulation circuit 500, chopped-off head filter circuit 200, secondary
The level modulation circuit 600 of filter circuit 300 and the 6th is serially connected and is coupled between power supply line VDD and earth terminal VSS.
To sum up, more than summing up for numerous implementation aspects, the present invention it is main using first, second, third, fourth, the 5th,
6th modulation circuit can exist simultaneously, or only set at least one of ingehious design, based on those circuits be by resistance, electric capacity with
The passive device of inductance wherein at least one composition characteristic, and controlling switch of arranging in pairs or groups voltage-current characteristic and level reference circuit institute
The reference signal of offer, thereby completes to be filtered analysis to the noise jamming of the online generation of power supply, reaches invention of the invention
Purpose.Similarly, based on similar design and Computing Principle, numerous other embodiments of the invention also can be by this little calculating feature
The formula of vector value, such as above formula (1) to (17) are in, and try to achieve its solution of occuring simultaneously, therefore are not repeated to illustrate.Thus see
It, electromagnetic interference rejects trap disclosed in this invention is not only a kind of design good and can effectively prevent and cause in power end
Resonant noise filter circuit, more can simultaneously maintain preferably Power Integrity (PI) and signal integrity (SI), actually one
Plant the circuit framework of innovation and great progressive.
In sum, power type electromagnetic interference eliminator disclosed in this invention is a kind of novel and the circuit of unconventionality
Design, can not only solve the resonant frequency noise on power end, more can maintain power supply by the filter construction of this two ends formula
Integrality.Therefore, it is only capable of being laid out filter circuit in the way of trial and error compared to prior art, the present invention not only has concurrently
There are low complex degree, the inexpensive and dynamical advantage on processing procedure, more may be such that integrated circuit possesses effective filter high frequency noise
The function of (by more than 100MHZ even to number GHz), it is real that there is splendid industry applications and competition compared to prior art
Power.
Embodiment described above is only explanation technological thought of the invention and feature, and its purpose makes to be familiar with this skill
Personage will appreciate that present disclosure and implements according to this, when can not with restriction protection scope of the present invention, i.e., generally according to this
Impartial change or modification that the disclosed spirit of invention is made, should cover within the scope of the present invention.
Claims (19)
1. a kind of wave filter for power type electromagnetic interference of preventing, its power supply line for being electrically coupled to a master chip and
Between load end, after the master chip is by power supply line supply power supply, an output voltage is produced to output current to this with one negative
End is carried, the wherein output voltage is mingled with an output voltage noise and an output current noise respectively with the output current, and should
Output voltage noise has a phase difference with the output current noise under the influence of the noise resonance of the power supply, it is characterised in that
This includes for the wave filter of power type electromagnetic interference of preventing：
One level reference circuit, it is electrically coupled to the master chip, and according to the output voltage noise and the output current noise
Therein at least one produces one first level reference signal；
One chopped-off head filter circuit, the level reference circuit in parallel, and receive the first level reference signal, the chopped-off head filter circuit
Also include one first controlling switch and at least one first modulation circuit, first controlling switch and at least one first modulation circuit
Mutually concatenate, and be coupled between the power supply line and an earth terminal, wherein the chopped-off head filter circuit is according to first level
Reference signal carries out characteristic vector value calculating to the output voltage noise or the output current noise, to export one second level ginseng
Examine signal；And
Level filter circuit, its electric property coupling chopped-off head filter circuit, and receive the second level reference signal, wherein this time
Level filter circuit carries out characteristic vector according to the second level reference signal to the output voltage noise or the output current noise
The calculating of value, to eliminate the output voltage noise, the output current noise and its phase difference, and then causes that the load end is received
The output voltage and the output current to after filtering the output voltage noise and the output current noise.
2. the wave filter for power type electromagnetic interference of preventing according to claim 1, wherein first modulation circuit electricity
Property is coupled between the power supply line and first controlling switch, and first controlling switch connect the level reference circuit with
Receive the first level reference signal.
3. the wave filter for power type electromagnetic interference of preventing according to claim 2, wherein the chopped-off head filter circuit be also
Including at least one second modulation circuit, it is electrically coupled between first controlling switch and the earth terminal, and the secondary is filtered
Circuit is electrically coupled to first modulation circuit or second modulation circuit.
4. the wave filter for power type electromagnetic interference of preventing according to claim 1, wherein first modulation circuit electricity
Property is coupled between first controlling switch and the earth terminal, and first controlling switch connects the level reference circuit to receive
The first level reference signal.
5. the wave filter for power type electromagnetic interference of preventing according to claim 4, wherein the chopped-off head filter circuit be also
Including at least one second modulation circuit, it is electrically coupled between the power supply line and first controlling switch, and the secondary
Filter circuit is electrically coupled to first modulation circuit or second modulation circuit.
6. the wave filter for power type electromagnetic interference of preventing according to claim 1, wherein first modulation circuit is
The circuit structure being made up of resistance, electric capacity and the passive device of inductance wherein at least one.
7. the wave filter for power type electromagnetic interference of preventing according to claim 3 or 5, wherein second modulation circuit
It is the circuit structure being made up of resistance, electric capacity and the passive device of inductance wherein at least one.
8. the wave filter for power type electromagnetic interference of preventing according to claim 1, the wherein secondary filter circuit be also
Including one second controlling switch and at least one the 3rd modulation circuit, second controlling switch and at least one the 3rd modulation circuit phase
Mutually concatenate, and be coupled between the power supply line and the earth terminal.
9. the wave filter for power type electromagnetic interference of preventing according to claim 8, wherein the 3rd modulation circuit electricity
Property is coupled between the power supply line and second controlling switch, and second controlling switch connect the chopped-off head filter circuit with
Receive the second level reference signal.
10. the wave filter for power type electromagnetic interference of preventing according to claim 9, the wherein secondary filter circuit be also
Including at least one the 4th modulation circuit, it is electrically coupled between second controlling switch and the earth terminal.
11. wave filters for power type electromagnetic interference of preventing according to claim 8, wherein the 3rd modulation circuit electricity
Property is coupled between second controlling switch and the earth terminal, and second controlling switch connects the chopped-off head filter circuit to receive
The second level reference signal.
12. wave filters for power type electromagnetic interference of preventing according to claim 11, the wherein secondary filter circuit
Also include at least one the 4th modulation circuit, it is electrically coupled between the power supply line and second controlling switch.
13. wave filters for power type electromagnetic interference of preventing according to claim 8, wherein the 3rd modulation circuit is
The circuit structure being made up of resistance, electric capacity and the passive device of inductance wherein at least one.
14. wave filter for power type electromagnetic interference of preventing according to claim 10 or 12, wherein the 4th modulation
Circuit is the circuit structure being made up of resistance, electric capacity and the passive device of inductance wherein at least one.
15. wave filters for power type electromagnetic interference of preventing according to claim 1, wherein first controlling switch are
One MOSFET transistor npn npn or bipolar junction transistors, to be located at the voltage electricity in different operating region using the transistor
Properties of flow carries out the calculating of this feature vector value so that the phase difference between the output voltage noise and the output current noise
Level off to zero.
16. wave filters for power type electromagnetic interference of preventing according to claim 8, wherein second controlling switch are
One MOSFET transistor npn npn or bipolar junction transistors, to be located at the voltage electricity in different operating region using the transistor
Properties of flow carries out the calculating of this feature vector value so that the phase difference between the output voltage noise and the output current noise
Level off to zero.
17. wave filters for power type electromagnetic interference of preventing according to claim 1, also including at least one the 5th modulation
Circuit, it concatenates the chopped-off head filter circuit and the secondary filter circuit so that at least one the 5th modulation circuit, chopped-off head filtering
Circuit and the secondary filter circuit are electrically coupled between the power supply line and the earth terminal, and the 5th modulation circuit is served as reasons
The circuit structure of resistance, electric capacity and the passive device of inductance wherein at least one composition.
18. wave filters for power type electromagnetic interference of preventing according to claim 1, wherein the level reference circuit bag
A reference capacitance and a reference resistance are included, the wherein reference capacitance is serially connected with the reference resistance, and first controlling switch
It is coupled to the connecting node of the reference capacitance and the reference resistance.
19. wave filters for power type electromagnetic interference of preventing according to claim 1, wherein first level are with reference to letter
Number with the second level reference signal be voltage signal or current signal.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1197939B (en) * | 1963-10-31 | 1965-08-05 | Siemens Ag | Device for separating direct current and alternating current |
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| JP2006005558A (en) * | 2004-06-16 | 2006-01-05 | Murata Mfg Co Ltd | High-frequency oscillator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1197939B (en) * | 1963-10-31 | 1965-08-05 | Siemens Ag | Device for separating direct current and alternating current |
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