CN110289752A - It is a kind of inhibit LLC resonant converter common mode Conduction Interference common-mode voltage offset method and circuit - Google Patents
It is a kind of inhibit LLC resonant converter common mode Conduction Interference common-mode voltage offset method and circuit Download PDFInfo
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- CN110289752A CN110289752A CN201910602773.XA CN201910602773A CN110289752A CN 110289752 A CN110289752 A CN 110289752A CN 201910602773 A CN201910602773 A CN 201910602773A CN 110289752 A CN110289752 A CN 110289752A
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Classifications
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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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- 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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
Abstract
The invention discloses a kind of common-mode voltages for inhibiting LLC resonant converter common mode Conduction Interference to offset method and circuit, described to offset method are as follows: by offsetting the common-mode voltage of LLC resonant converter, realizes and inhibits its common mode Conduction Interference；The common-mode voltage for offsetting LLC resonant converter is two windings of addition on input power cord；Described two windings are coupled with transformer.The invention proposes using common-mode voltage to offset method to realize the inhibition for conducting common mode, by offsetting the common-mode voltage of LLC resonant converter, to inhibit its common mode Conduction Interference；It is coupled by the present invention by the way that two windings are added on input power cord with transformer, realizes the common-mode voltage for offsetting LLC resonant converter；The present invention realizes simply, does not need to increase compensating electric capacity, therefore avoid the consistency problem of compensating electric capacity tolerance introducing, so that the present invention has higher practicability.
Description
Technical field
The invention belongs to the technical fields of LLC resonant converter common mode conductive interference suppression, and in particular to a kind of inhibition LLC
The common-mode voltage of controlled resonant converter common mode Conduction Interference offsets method and circuit.
Background technique
Since there are the variations of current potential high frequency in HF switch state, converters for power device work
Node.The current potential of high frequency variation can generate displacement current in the parasitic capacitance between these nodes and protecting field, and then cause
Common mode (Common Mode, CM) Conduction Interference, and power grid is entered by input power cord, influence other equipment in same power grid
Normal work.
In order to inhibit the common mode Conduction Interference of converter, it is added usually between input power and converter by common mode inductance
The common-mode filter constituted with Y capacitance.Since Y capacitance is connected between input power cord and protecting field, capacitance is by leakage current
There are upper limit values for limitation.In this way, in order to reach required attenuation requirement, common mode inductance amount is often larger.In addition, common mode inductance
Winding flow through input current.Therefore, the volume and weight of common mode inductance is larger, constrains power-efficient and power density
It is promoted.
The common method for inhibiting interference includes that common mode current offsets method and common-mode voltage offsets method.
Referring to Fig. 1, common mode current offsets method, wherein 25 Ω resistance are the equivalent Impedance measurement of common mode interference, CsumAnd vENS
It is total parasitic capacitance in converter common mode interference model and equivalent interference source respectively.What is be added offsets branch routing compensation electricity
Potential source vcomWith compensating electric capacity CcomIt constitutes, as the electric current i for flowing through compensation branchcomThe common mode current i generated with converternSize
When equal, the electric current for flowing through the equivalent Impedance measurement of LISN is zero, that is, inhibits common mode Conduction Interference, at this time offset voltage and benefit
Repay capacitor satisfaction:
In Fig. 1, the common mode current that converter generates offsets branch by the parallel connection being added to offset, however compensating electric capacity is deposited
In tolerance, it will affect the effect that common mode interference offsets.
Referring to fig. 2, method is offseted for common-mode voltage, connect a compensating voltage source v in the loopcom, work as vcom=vENS
When, the voltage for being added in the equivalent Impedance measurement both ends 25 Ω is zero, to eliminate common mode interference.Since this method is directly offset
The common-mode voltage of converter, therefore referred to as common-mode voltage offsets method.This method needs not compensate for capacitor, avoids electricity
Hold consistency problem caused by tolerance.
According to fig. 2, it establishes and equivalent interference source vENSEqual compensating voltage source vcomIt is the pass realizing common mode interference and offseting
Key.In Buck converter, equivalent interference source vENSThe form that can be expressed as, it may be assumed that
vENS=kvQ (2)
Wherein, k is the ratio (0 < k < 1) of corresponding parasitic capacitor in circuit, vQFor the voltage of switching node to Power Groud, i.e.,
The drain-source voltage of down tube.Due to vQWith the voltage v of output inductor windingLfAC compounent having the same, i.e.,
vQ=vLf (3)
The condition v that middle common mode interference offsets according to fig. 2com=vENS, convolution (2) and formula (3) are available
vcom=kvLf (4)
By formula (4) it is found that required offset voltage vcomSize and LLC resonant converter circuit in corresponding parasitic capacitor
The voltage v at ratio k and inductance both endsLfIt is related.Accordingly, magnetic-coupled mode coiling suitable number of turns on inductance can be used
Auxiliary winding, by the auxiliary winding provide needed for offset voltage, as shown in Figure 3.
According to Fig. 3, required offset voltage, two input power cords of converter should all add offset voltage in order to obtain
kvLf, so that the common-mode voltage of LISN test lead to inverter power supply input side is kvLf。
Summary of the invention
The technical problem to be solved by the present invention is to solve the above shortcomings of the prior art and to provide a kind of inhibition LLC resonance
The common-mode voltage of converter common mode Conduction Interference offsets method and circuit.
To realize the above-mentioned technical purpose, the technical scheme adopted by the invention is as follows:
A kind of common-mode voltage inhibiting LLC resonant converter common mode Conduction Interference offsets method, described to offset method are as follows: logical
The common-mode voltage for offsetting LLC resonant converter is crossed, realizes and inhibits its common mode Conduction Interference；
The common-mode voltage for offsetting LLC resonant converter is two windings of addition on input power cord；
Described two windings are coupled with transformer.
Preferably, above-mentioned two winding is respectively connected to anode and the input of LLC resonant converter circuit of input power
The cathode of the cathode of anode and input power and the input of LLC resonant converter circuit.
Preferably, the Same Name of Ends relationship of above-mentioned two winding and transformer primary winding are as follows: with input power positive and negative anodes point
Not Xiang Lian endpoint, be Same Name of Ends with the endpoint that is connected in transformer primary winding with Power Groud.
Preferably, the equal turn numbers of above-mentioned two winding, the number of turns of two windings by transformer primary winding the number of turns with
Ratio in LLC resonant converter circuit to parasitic capacitance safely determines.
A kind of common-mode voltage cancellation circuit inhibiting LLC resonant converter common mode Conduction Interference, including LLC resonant converter
Circuit and two windings；It is described two around the input power cord for being mounted on LLC resonant converter circuit, described two windings with
The transformer of LLC controlled resonant converter circuit is coupled.
Preferably, above-mentioned two winding is respectively connected to anode and the input of LLC resonant converter circuit of input power
The cathode of the cathode of anode and input power and the input of LLC resonant converter circuit.
Preferably, the Same Name of Ends relationship of above-mentioned two winding and transformer primary winding are as follows: with input power positive and negative anodes point
Not Xiang Lian endpoint, be Same Name of Ends with the endpoint that is connected in transformer primary winding with Power Groud.
Preferably, the equal turn numbers of above-mentioned two winding, the number of turns of two windings by transformer primary winding the number of turns with
Ratio in LLC resonant converter circuit to parasitic capacitance safely determines.
The invention has the following advantages:
The invention proposes using common-mode voltage to offset method to realize the inhibition for conducting common mode, by offsetting LLC resonance
The common-mode voltage of converter, to inhibit its common mode Conduction Interference；
It is coupled by the present invention by the way that two windings are added on input power cord with transformer, realizes counteracting
The common-mode voltage of LLC resonant converter；
The present invention realizes simply, does not need to increase compensating electric capacity, therefore avoid the consistency of compensating electric capacity tolerance introducing
Problem, so that the present invention has higher practicability.
Detailed description of the invention
Fig. 1 is the electrical block diagram that common mode current offsets method.
Fig. 2 is the electrical block diagram that common-mode voltage offsets method.
Fig. 3 is the realization principle figure that common-mode voltage offsets method.
Fig. 4 is the realization that a kind of common-mode voltage for inhibiting LLC resonant converter common mode Conduction Interference of the present invention offsets method
Schematic diagram.
Fig. 5 is a kind of circuit for the common-mode voltage cancellation circuit for inhibiting LLC resonant converter common mode Conduction Interference of the present invention
Schematic diagram.
Fig. 6 is the circuit diagram of LLC resonant converter.
Fig. 7 is the common mode interference model circuit diagram of LLC resonant converter.
Fig. 8 is the thevenin equivalent circuit figure of LLC resonant converter.
Fig. 9 is the transformer physical model schematic diagram for calculating transformer winding construction parameter.
Figure 10 is the transformer equivalent model schematic diagram for calculating transformer winding construction parameter.
Specific embodiment
The embodiment of the present invention is described in further detail below in conjunction with attached drawing.
A kind of common-mode voltage of inhibition LLC resonant converter common mode Conduction Interference of the invention offsets method, described to offset
Method are as follows: by offsetting the common-mode voltage of LLC resonant converter, realize and inhibit its common mode Conduction Interference；
The common-mode voltage for offsetting LLC resonant converter is two windings of addition on input power cord；
Described two windings are coupled with transformer.
In embodiment, above-mentioned two winding is respectively connected to the anode of input power and LLC resonant converter circuit inputs
Anode and input power cathode and LLC resonant converter circuit input cathode.
In embodiment, the Same Name of Ends relationship of above-mentioned two winding and transformer primary winding is as shown in Figure 5: with input power
Endpoint a in the terminal A and C, with transformer primary winding that positive and negative anodes are respectively connected with is Same Name of Ends.
In embodiment, the number of turns N of above-mentioned two windingABAnd NCDIt is equal, and the number of turns of the two windings is by transformer primary
The number of turns N of side windingabIt is determined with the ratio in LLC resonant converter circuit to parasitic capacitance safely.As shown in figure 5,
NABAnd NCDExpression are as follows:Wherein n is transformer turns ratio, C0To become
The structure capacitive of depressor original vice-side winding, λaAnd λcExpression it is related with the winding construction of transformer.
A kind of common-mode voltage cancellation circuit inhibiting LLC resonant converter common mode Conduction Interference, including LLC resonant converter
Circuit and two windings；It is described two around the input power cord for being mounted on LLC resonant converter circuit, described two windings with
The transformer of LLC controlled resonant converter circuit is coupled.
In embodiment, above-mentioned two winding is respectively connected to the anode of input power and LLC resonant converter circuit inputs
Anode and input power cathode and LLC resonant converter circuit input cathode.
In embodiment, the Same Name of Ends relationship of above-mentioned two winding and transformer primary winding are as follows: just with LLC resonant converter
The endpoint that cathode is respectively connected with is Same Name of Ends with the endpoint being connected in transformer primary winding with Power Groud.
In embodiment, the equal turn numbers of above-mentioned two winding, the number of turns of two windings by transformer primary winding the number of turns
It is determined with the ratio in LLC controlled resonant converter circuit to parasitic capacitance safely.
Working principle of the present invention is as follows: referring to fig. 4, common mode inductance winding AB and common mode inductance winding CD, the number of turns NAB
With NCDIt is kLLCNab, wherein NabFor the number of turns of filter inductance winding.Ignore winding leakage inductance, there is vBD=Vin+vAB-vCD=Vin,
Therefore common mode inductance winding, which is added, will not influence the normal work of converter.In addition, in order to reduce the copper loss of common mode inductance winding,
The input filter capacitor C of converterinIt should be placed between converter and common mode inductance winding, so that flowing through the electricity of common mode inductance winding
Stream is direct current.
According to above-mentioned analysis, Fig. 5 gives the circuit diagram of the LLC resonant converter offseted using common-mode voltage, common mode electricity
The number of turns for feeling winding AB and CD is kLLCNab, wherein NabFor the number of turns of primary side winding.
Lower mask body derives the equivalent interference source v of LLC resonant converter common mode Conduction InterferenceENSExpression formula, and accordingly really
Determine the number of turns of common mode inductance winding.
Fig. 6 gives the circuit diagram of LLC resonant converter, wherein CS1And CD1It is switching tube Q respectively1And Q2Drain electrode it is logical
Cross radiator to protecting field parasitic capacitance.The common mode interference model of LLC resonant converter is derived using Substitution Theoren below.
Firstly, by Q2It is replaced by waveform alternating-current voltage source v identical with its drain-source voltageQ2, LrAnd CrSeries arm be replaced by wave
The same alternating-current voltage source v of shaperes.In the Conduction Interference frequency range of 150kHz~30MHz, the equivalent resistance of the common mode interference of LISN
Resist for 25 Ω resistance.Output capacitance CoVoltage be essentially direct current, therefore CoRegard short circuit as.Ignore transformer leakage inductance, by transformation
Device is replaced by controlled voltage/current source, while for convenience of analysis model, the distribution capacity of transformer is equivalent to two capacitors
CaeAnd Cbe.To avoid occurring in circuit pure voltage resource loop, by Q1、DR1And DR2It is replaced by respectively identical as respective current waveform
Current source.In this way, obtaining the common mode interference equivalent circuit of LLC half bridge resonant, as shown in Figure 7.
Fig. 8 is participated in, using superposition theorem, the situation of current source effect is only considered first, by voltage source vQ2And vresShort circuit,
Current source i at this timeQ1、iDR1And iDR2It is all short-circuited, therefore current source does not influence common mode Conduction Interference.Then, by current source iQ1、
iDR1And iDR2Open circuit only considers the situation of voltage source effect.By this circuit reduction, the expression of its available equivalent interference source
Formula are as follows:
When switching frequency is close to resonance frequency, the impedance of resonant inductance and resonance capacitive series branch is much smaller than excitation electricity
The impedance of sense, therefore the voltage v on series resonance branch roadresWith vQ2Compared to can ignore, vQ2With vabIt is approximately equal.At this time
Formula (4) can be expressed as
vENS_LLC=kLLCvab (5)
In formula:
Two capacitor CaeAnd CbeExpression formula be respectively as follows:
Cae=[λa+n(1-2λc)]C0 (7a)
Cbe=[1- λa-n(1-2λc)]C0 (7b)
Wherein, λaAnd λcFor the winding construction parameter of transformer, determined by transformer winding structure.C0For transformer primary pair
The structure capacitive of side winding, it can be measured by experiment: the endpoint of the primary side winding of transformer and vice-side winding be distinguished short
It connects, measures two capacitances being shorted between point with LCR table later.
Formula (7) are substituted into formula (6), are obtained:
According to formula (8), the number of turns of common mode inductance winding AB and CD are kLLCNab。
Transformer winding structure parameter lambdaaAnd λcCalculating:
For Fig. 9 and transformer winding structure shown in Fig. 10, its winding construction parameter lambda is calculatedaAnd λc.For it
It is similar to calculate thinking for the transformer of his winding construction.
Remember that the parasitic capacitance between primary side winding Pri1 and vice-side winding Sec1-1 is C1, posting between Pri2 and Sec2-2
Raw capacitor is C2, due to using the insulating materials of the same race of same thickness between Pri1 and Sec1-1 and Pri2 and Sec2-2, because
This C1With C2It is approximately equal.
The displacement current for flowing through Pri1 to Sec1-1 and Pri2 to Sec2-2 is respectively as follows:
Wherein, λ1Expression formula be
Wherein, r1For the internal diameter of primary side winding, r2For its outer diameter, NPFor the number of turns of primary side winding.
Since Pri1 to Sec1-1 and Pri2 to Sec2-2 uses the insulating materials of the same race of same thickness, C1=C2
=0.5C0, then the sum of the displacement current for flowing through this two layers of winding is
Flow through the general expression of the total displacement electric current of transformer primary vice-side winding distribution capacity are as follows:
Composite type (11) and (12), it can be seen that the winding construction parameter lambda of the transformeraAnd λcIt is 0.5.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (8)
1. a kind of common-mode voltage for inhibiting LLC resonant converter common mode Conduction Interference offsets method, it is characterised in that: described to offset
Method are as follows: by offsetting the common-mode voltage of LLC resonant converter, realize and inhibit its common mode Conduction Interference；
The common-mode voltage for offsetting LLC resonant converter is two windings of addition on input power cord；
Described two windings are coupled with transformer.
2. a kind of common-mode voltage for inhibiting LLC resonant converter common mode Conduction Interference according to claim 1 offsets method,
It is characterized by: described two windings are respectively connected to the anode and the anode of LLC resonant converter circuit input of input power,
And the cathode of the cathode of input power and the input of LLC resonant converter circuit.
3. a kind of common-mode voltage for inhibiting LLC resonant converter common mode Conduction Interference according to claim 1 offsets method,
It is characterized by: the Same Name of Ends relationship of described two windings and transformer primary winding are as follows: distinguish phase with input power positive and negative anodes
Endpoint even is Same Name of Ends with the endpoint being connected in transformer primary winding with Power Groud.
4. a kind of common-mode voltage for inhibiting LLC resonant converter common mode Conduction Interference according to claim 1 offsets method,
It is characterized by: the equal turn numbers of described two windings, the number of turns of two windings is humorous by the number of turns and LLC of transformer primary winding
Ratio in vibration converter circuit to parasitic capacitance safely determines.
5. a kind of common-mode voltage cancellation circuit for inhibiting LLC resonant converter common mode Conduction Interference, it is characterised in that: including LLC
Controlled resonant converter circuit and two windings；It is described two around the input power cord for being mounted on LLC resonant converter circuit, described two
The transformer of a winding and LLC resonant converter circuit is coupled.
6. a kind of common-mode voltage cancellation circuit for inhibiting LLC resonant converter common mode Conduction Interference according to claim 5,
It is characterized by: described two windings are respectively connected to the anode and the anode of LLC resonant converter circuit input of input power,
And the cathode of the cathode of input power and the input of LLC resonant converter circuit.
7. a kind of common-mode voltage cancellation circuit for inhibiting LLC resonant converter common mode Conduction Interference according to claim 5,
It is characterized by: the Same Name of Ends relationship of described two windings and transformer primary winding are as follows: distinguish phase with input power positive and negative anodes
Endpoint even is Same Name of Ends with the endpoint being connected in transformer primary winding with Power Groud.
8. a kind of common-mode voltage cancellation circuit for inhibiting LLC resonant converter common mode Conduction Interference according to claim 5,
It is characterized by: the equal turn numbers of described two windings, the number of turns of two windings is humorous by the number of turns and LLC of transformer primary winding
Ratio in vibration converter circuit to parasitic capacitance safely determines.
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