CN107425722A - A kind of LLC resonant converter frequency modulation phase shift current-sharing control method in parallel - Google Patents
A kind of LLC resonant converter frequency modulation phase shift current-sharing control method in parallel Download PDFInfo
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- CN107425722A CN107425722A CN201710321473.5A CN201710321473A CN107425722A CN 107425722 A CN107425722 A CN 107425722A CN 201710321473 A CN201710321473 A CN 201710321473A CN 107425722 A CN107425722 A CN 107425722A
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/285—Single converters with a plurality of output stages connected in parallel
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Abstract
The invention discloses a kind of LLC resonant converter frequency modulation phase shift current-sharing control method in parallel, the control method uses realizes the stable output of voltage by PFM (pulse frequency modulated) control method using Voltage loop as realization, Voltage loop is combined supplemented by electric current loop of advocating peace；Electric current loop using Phaseshift controlling make caused by angle of phase displacement act on caused by Voltage loop on pulse signal, make system meet voltage stabilization output on the premise of, realize the current balance function between parallel module and the excessive damage equipment of a certain phase current can be prevented.The control strategy combined using Voltage loop and electric current loop not only realizes that the stable of voltage exports, also eliminate the influence of the current unevenness caused by parallel module self electromagnetism device parameters error or load distribution are uneven, extend service life of equipment, conversion efficiency and dynamic stability for improving resonant transform circuit system, there is important application value.
Description
Technical field
The present invention relates to electric and electronic technical field, relates more specifically to a kind of LLC resonant converter frequency modulation phase shift in parallel
Current-sharing control method.
Background technology
With the fast development of China's economy, drive the continuous heating of automobile industry, while electric automobile charging pile is ground
Hair should also include development plan.People propose higher want to volume, power density, charge efficiency of charging pile etc.
Ask, in order to shorten the charging interval of automobile, improve operating efficiency, it is necessary to improve the working frequency of converter in charging pile.
Due to high frequency requirement, soft switch technique is set to turn into study hotspot.Harmonic technology is as realizing soft switch technique
A kind of feasible pattern, hard switching loss can be reduced, improve efficiency.Most common of which be LLC (Lr, Lm, Cr abbreviation, its
In, Lr is resonant inductance, and Lm magnetizing inductances, Cr is resonant capacitance) resonant transformation technology, original can be realized in full-load range
Side switching tube ZVS (ZVT), secondary side diode can realize ZCS (Zero Current Switch), both reduce its voltage stress,
It turn avoid reverse recovery loss.
But because controlled resonant converter output stage only has capacitive filter, therefore the shortcomings that output current ripple is big be present.Always
For body, the switching loss of LLC resonant converter is smaller, is adapted to high frequency application, but faces the limit such as capacity, output ripple
System.
Using multiphase interleaving LLC resonance converters, the output ripple in output capacitance can be significantly reduced.Pass through
Ripple size can obtain in the case of calculating two-phase, three-phase, four phases, five are in parallel, and the number of phases of crisscross parallel is more, and ripple rate is got over
Small, semiconductor devices current stress requires lower, but with the increase of number of modules, improves degree but increasingly unobvious, and
Topological structure and control mode more sophisticated.So generally use two-phase or parallel three phase, not only reduce output current
Ripple, also expand the capacity of equipment.Although existing scholar's flow problem used in parallel to LLC resonant converter makes research,
But still have development space, such as some scholars propose to control each phase to flow using external circuit, but its cost is high, and control is complicated；
Some scholars are proposed using PFM (pulse frequency modulated) modulation or PWM (pulse width modulation) modulator approach combination phase shifting control
Method, but easily cause the loss of phase shifting angle in Multiphase Parallel circuit.
The content of the invention
The present invention proposes a kind of LLC resonant converter frequency modulation phase shift current-sharing control method in parallel, realizes that stablizing for voltage is defeated
Go out, eliminate the influence of current unevenness caused by parallel module self electromagnetism device parameters error or load distribution inequality, extension is set
Standby service life, improves the conversion efficiency and dynamic stability of resonant transform circuit system, there is important application value.
Art solutions of the present invention are realized by following steps：
Step 1：First to LLC resonant converter output voltage U in parallelOSampling, and with given voltage signal UrefMake the difference,
Its output signal is that the signal exported after pressure difference △ u, △ u are modulated by PI is UVCO, UVCOGiven letter as voltage controlled oscillator
Number, PFM controls are realized by voltage controlled oscillator, according to the size of voltage variety, produce corresponding frequency change, and utilize
Phase shift is carried out to the output signal of voltage controlled oscillator to the form that pulse train counts, and opened by logical relation producing each road
The drive signal of pipe is closed, forms basic voltage mode control, the voltage stabilizing output of controlled resonant converter, and response speed can be realized
It hurry up.
Step 2：To the resonance current i of each road parallel connection LLC resonance circuitsLrSampled.Because resonance current is according to humorous
Vibration frequency changes, so being directly difficult to the real-time tracking to each phase resonance electric current using PI modulation controls and making tune in time
It is whole, so this secondary design uses the virtual value of resonance current as feedback signal.
Step 3：Judge the size of each phase resonance current effective value, find out maximum resonance current virtual value where and
Gang mould block MLLCi(if shared m phase resonances converter is in parallel, 0 ＜ i≤m)；By calculating between each phase resonance current effective value
Difference | △ IerrLk-j_| (if shared m phase resonances converter is in parallel, 0 ＜ k≤m, 0 ＜ j≤m, k ≠ j), and therefrom find out most
Big difference and to make it be △ Ierr_max。
Step 4：Pass through resonance modules MLLCi, make the i-th corresponding switch kiA ends are jumped to from earth terminal, utilize difference between current
Value △ Ierr_maxActed on by the PI regulations of electric current loop with amplitude limit value, it is converted into corresponding phase shift angle θ.
Step 5：The angular range of phase shift isBecause phase shift effect is acted on where maximum resonance electric current
Resonance circuit driving pulse on, it is possible to it is excessive to suppress certain phase resonance electric current, avoids equipment from damaging equipment because of excessively stream.
Step 6：Caused phase shift angle θ is applied on the drive signal of the resonance circuit of the phase of resonance current i-th, made
It is combined with PFM pulse frequencies, due to phase shift angle θ limitation, it is achieved that realizing flow equalizing function on the basis of voltage.
Figure of description
Fig. 1 parallel three phase LLC resonant converter main circuit topologies
Fig. 2 sharing control block diagrams
Fig. 3 driving pulse phase shift waveforms
Fig. 4 frequency modulation phase phase shift sharing control block diagrams
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with patent of the present invention
Accompanying drawing, the technical scheme in patent of the present invention is explicitly described, it is clear that described embodiment be the present invention one
Section Example, rather than whole embodiments.
Control method of the present invention is applied to series resonance translation circuit, specifically includes：LC series resonances translation circuit (SRC)
Parallel connection, series parallel resonance translation circuit (SPRC) parallel connection and LLC series resonance translation circuits parallel connection, the main topology of circuit
Can be half-bridge, full-bridge etc..
This embodiment is illustrated using three-phase LLC resonant converter.
The ripple rate of each phase output capacitance ripple of table 1
Io represents output current, and Imi indicates i wired in parallel, the peak value of each module, and △ Ic are maximum ripple value
Involved circuit topological structure in the present embodiment as shown in figure 1, using three-phase LLC resonant converter parallel-connection structure,
It is small using parallel three phase output ripple for LLC resonant converter as can be seen from Table 1, and the capacity of whole system is expanded,
So it is used as research object using three-phase LLC resonant converter is in parallel.Controlled resonant converter can be broadly divided into：It is square-wave generator, humorous
Shake unit, transformer, rectification unit and output filter unit.
Square-wave generator is specially：Switching network is mainly made up of half-bridge and switching tube；Resonant network uses LLC type resonance
Chamber, include resonant capacitance Cr, resonant inductance LrWith static exciter inductance Lm；Transformer primary side is connected using Y types, and secondary is in parallel
Output；Rectification unit realizes the transmission of electric energy using switch tube device or commutation diode；Output uses capacitor filtering.
Output voltage Uo is sampled first, △ u are obtained compared with being made the difference with Setting signal Uref, its value is defeated after being modulated by PI
Setting signal of the signal gone out as voltage controlled oscillator, voltage controlled oscillator have higher modulating bandwidth, can be in the electricity of very little
Pressure fluctuation is lower to realize higher frequency adjustment.Voltage controlled oscillator produces sawtooth waveforms, is then converted into square wave by logical relation, leads to
Cross to count pulse train and realize three-phase phase shifting control；The finally drive signal using logical relation to each way switch pipe of generation,
Parallel three phase controlled resonant converter is set to realize basic voltage-type PFM voltage stabilizings control.
Realize the control method of its flow equalizing ring of sharing control as shown in Fig. 2 right first the LLC resonance circuits of parallel three phase
The resonance current of three-phase resonance circuit is sampled, and obtains iL1、iL2、iL3.Due to iL1、iL2、iL3It is to change according to resonant frequency
, so being directly difficult to using PI modulation controls to iL1、iL2、iL3Real-time tracking and make adjustment in time, so this
Design uses the virtual value I of resonance currentL1、IL2、IL3As feedback signal, the resonance current virtual value for judging maximum is
Imax2, the parallel module at place is MLLC2(set the effective of the resonance current in each parallel resonance converter in the 2nd phase LLC converters
Value is maximum), calculate IL1、IL2、IL3Mutually make the difference to obtain | △ IerrL1-2|、|△IerrL2-3|、|△IerrL1-3|, therefrom select most
Big difference, and it is △ I to make its maximum valueerr_max.Because maximum current Imax2, then jump to the 2nd corresponding switch k2
A ends close, to the resonance current virtual value I of the 2nd phasemax2The PI modulation of electric current loop is carried out, is allowed to produce corresponding angle of phase displacement
Degree.The scope of angle of phase displacement is chosen, angle of phase displacement is 60 ° of 0≤θ ＜.Caused phase shift angle is applied to that of resonance current maximum
On the drive signal of one phase resonance circuit, the drive signal now obtained is as shown in Figure 3.
Voltage-type PFM is controlled and is combined with three-phase LLC sharing controls, obtains the crisscross parallel LLC resonant transformations of system
The efficient charge control strategy of device, the control method of realization are as shown in Figure 4, it can be seen that Voltage loop relies primarily on PFM control
Realize the stable output of voltage, adjust pulse frequency in time according to voltage controlled oscillator so as to which stabilization transform device exports during voltage pulsation
Voltage；Electric current loop mainly using phase shifting control make caused by phase shifting angle act on and pass through tune caused by Voltage loop on pulse signal
Section pulsewidth realizes stream between three-phase, makes on the premise of system meets voltage stabilization output, to realize the stream between parallel module
Act on and the excessive damage equipment of a certain phase current can be prevented.The control strategy combined using Voltage loop and electric current loop not only realizes electricity
The stable output of pressure, also eliminate the electric current caused by parallel module self electromagnetism device parameters error or load distribution are uneven
Uneven influence, service life of equipment is extended, improve the conversion efficiency and dynamic stability of resonant transform circuit system, there is weight
The application value wanted.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is defined.
Claims (4)
1. a kind of LLC resonant converter frequency modulation phase shift current-sharing control method in parallel, it is characterised in that use using Voltage loop to advocate peace
The control method being combined supplemented by electric current loop, Voltage loop are constant by PFM (pulse frequency modulated) control method generation dutycycle
The modulated signal of frequency shift realizes the stable output of voltage；Electric current loop makes caused angle of phase displacement effect using Method of Phase-Shift Controlling
On pulse signal, the stream between three-phase is being realized by adjusting pulsewidth caused by Voltage loop.
2. the current-sharing control method that LLC resonant converter frequency modulation phase shift in parallel according to claim 1 is combined, its feature
It is, the electric current loop by each phase resonance current sample, calculating the size of its virtual value, and be compared, judgement respectively
The parallel module M gone out where the resonance current of maximumLLCi, and calculate maximum current ImaxiWith each road resonance current virtual value it
Between maximum current differential △ Ierr_max。
3. the current-sharing control method that LLC resonant converter frequency modulation phase shift in parallel according to claim 2 is combined, its feature
It is, by selecting maximum current Imaxi, judgement opens the i-th corresponding switch ki, modulated by PI, be allowed to produce corresponding
Phase shift angle θ, and caused phase shift angle is applied on the drive signal of that maximum phase resonance circuit of resonance current.
4. the current-sharing control method that LLC resonant converter frequency modulation phase shift in parallel according to claim 1 is combined, its feature
It is, by the control method being combined supplemented by by electric current loop of advocating peace of Voltage loop, before system is met voltage stabilization output
Put, realize the current balance function between parallel module and the excessive damage equipment of a certain phase current can be prevented.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108683337A (en) * | 2018-04-26 | 2018-10-19 | 同济大学 | Transformation system with multiple LLC half bridge resonants and current equalizing method |
| CN112260544A (en) * | 2020-09-22 | 2021-01-22 | 易事特集团股份有限公司 | LLC resonant converter control method and control system thereof |
| CN113489336A (en) * | 2021-07-16 | 2021-10-08 | 清华大学 | Multi-resonance LCLLC converter system and control method thereof |
| CN113556043A (en) * | 2021-09-17 | 2021-10-26 | 四川英杰电气股份有限公司 | Frequency modulation control circuit of resonant converter and control method thereof |
| CN113992022A (en) * | 2021-10-20 | 2022-01-28 | 华中科技大学 | Multiphase interleaved LLC converter optimization control method and device |
| WO2022056761A1 (en) * | 2020-09-17 | 2022-03-24 | 华为数字能源技术有限公司 | Photovoltaic system, and resonant switched capacitor converter and control method |
| CN115173714A (en) * | 2022-08-09 | 2022-10-11 | 河北科技大学 | Light-load operation control system and method for three-phase CLLLC resonant converter |
| WO2023024111A1 (en) * | 2021-08-27 | 2023-03-02 | 华为数字能源技术有限公司 | Inverting conversion circuit and photovoltaic power generation system |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108683337A (en) * | 2018-04-26 | 2018-10-19 | 同济大学 | Transformation system with multiple LLC half bridge resonants and current equalizing method |
| WO2022056761A1 (en) * | 2020-09-17 | 2022-03-24 | 华为数字能源技术有限公司 | Photovoltaic system, and resonant switched capacitor converter and control method |
| CN114586270B (en) * | 2020-09-17 | 2023-12-08 | 华为数字能源技术有限公司 | Photovoltaic system, resonant switch capacitor converter and control method |
| CN114586270A (en) * | 2020-09-17 | 2022-06-03 | 华为数字能源技术有限公司 | Photovoltaic system, resonant switch capacitor converter and control method |
| CN112260544A (en) * | 2020-09-22 | 2021-01-22 | 易事特集团股份有限公司 | LLC resonant converter control method and control system thereof |
| CN113489336A (en) * | 2021-07-16 | 2021-10-08 | 清华大学 | Multi-resonance LCLLC converter system and control method thereof |
| WO2023024111A1 (en) * | 2021-08-27 | 2023-03-02 | 华为数字能源技术有限公司 | Inverting conversion circuit and photovoltaic power generation system |
| CN113556043B (en) * | 2021-09-17 | 2021-12-24 | 四川英杰电气股份有限公司 | Frequency modulation control circuit of resonant converter and control method thereof |
| CN113556043A (en) * | 2021-09-17 | 2021-10-26 | 四川英杰电气股份有限公司 | Frequency modulation control circuit of resonant converter and control method thereof |
| CN113992022A (en) * | 2021-10-20 | 2022-01-28 | 华中科技大学 | Multiphase interleaved LLC converter optimization control method and device |
| WO2023065380A1 (en) * | 2021-10-20 | 2023-04-27 | 华中科技大学 | Optimization control method and apparatus for multiphase staggered parallel llc converter |
| CN113992022B (en) * | 2021-10-20 | 2023-09-29 | 华中科技大学 | Multi-phase staggered parallel LLC converter optimal control method and device |
| CN115173714A (en) * | 2022-08-09 | 2022-10-11 | 河北科技大学 | Light-load operation control system and method for three-phase CLLLC resonant converter |
| WO2024032330A1 (en) * | 2022-08-09 | 2024-02-15 | 河北科技大学 | Light-load operation control system and method for three-phase clllc resonant converter |
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