CN109600047B - Parameter optimization method for LLC module in DC/DC circuit - Google Patents

Parameter optimization method for LLC module in DC/DC circuit Download PDF

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CN109600047B
CN109600047B CN201811612916.7A CN201811612916A CN109600047B CN 109600047 B CN109600047 B CN 109600047B CN 201811612916 A CN201811612916 A CN 201811612916A CN 109600047 B CN109600047 B CN 109600047B
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resonant
circuit
current
value
voltage
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CN109600047A (en
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帅禄玮
李月根
陈成成
房明硕
曹以龙
江友华
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Shanghai University of Electric Power
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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
    • H02M3/325—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 using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention relates to a parameter optimization method of an LLC module in a DC/DC circuit, which comprises the following steps: 1) performing parameter optimization on an LLC module in the DC/DC circuit by adopting a particle swarm algorithm to obtain an optimal solution; 2) and modulating a switching tube in a main circuit of the LLC module by adopting a phase-shifting and frequency modulation hybrid control method to obtain optimized output voltage and output current. Compared with the prior art, the invention has the advantages of stable control, accurate parameter design, stable operation and the like.

Description

Parameter optimization method for LLC module in DC/DC circuit
Technical Field
The invention relates to the technical field of LLC modules, in particular to a parameter optimization method of an LLC module in a DC/DC circuit.
Background
In recent years, with the increase of power electronic devices and the increasing of power grades, a series of standards for limiting harmonic pollution of electric equipment are successively established at home and abroad, and the input end of the electric equipment generally adopts a power factor correction technology to eliminate the harmonic pollution. The three-phase power factor correction converter is applied to medium and high power supply occasions, and plays a very important role in eliminating harmonic pollution. However, the output voltage of the three-phase power factor correcting converter is generally high voltage, so that the voltage stress of a switching tube in the converter is increased, the high voltage can not be borne by a common MOSFET, and the high-voltage MOSFET has high cost and poor performance.
With the wide application of the switching power supply in the high and new technology field, the switching power supply has the key for developing the industry, and the switching power supply reduces the switching loss and the input and output ripples while ensuring high frequency and miniaturization. The LLC resonant converter, as one of the important technologies for power converter high frequency, can create the conditions of zero voltage switching-on and zero current switching-off for a power MOSFET, thereby laying the foundation for realizing the soft switching technology. The logical design of the parameters of the LLC resonant circuit can ensure that the LLC resonant circuit has good working performance, however, the unique circuit structure of the LLC resonant converter determines that the voltage value at two ends of the resonant circuit is limited by the input voltage, so that the output power of the circuit is limited, and the parameter design for the common LLC resonant converter is not applicable any more.
Disclosure of Invention
The present invention is directed to a method for optimizing parameters of an LLC module in a DC/DC circuit, which overcomes the above-mentioned drawbacks of the prior art.
The purpose of the invention can be realized by the following technical scheme:
a method for parameter optimization of an LLC module in a DC/DC circuit, the method comprising the steps of:
s1: performing parameter optimization on an LLC module in the DC/DC circuit by adopting a particle swarm algorithm to obtain an optimal solution;
and establishing a functional relation by taking the resonant current Is, the resonant switching frequency fr and the resonant inductor Lr as variables, and finding out an optimal solution through a particle swarm algorithm.
The expression of the optimal solution is:
Figure BDA0001925198140000021
Figure BDA0001925198140000022
Figure BDA0001925198140000023
Lm＝mLr
in the formula, Cr is capacitance value of resonant capacitor, Rac is resistance value of AC equivalent load resistor, Lr is inductance value of resonant inductor, Lm is inductance value of excitation inductor, fs is resonant frequency, R isLdThe dc-side load resistance is Q, m and pi are constant coefficients, respectively.
S2: and modulating a switching tube in a main circuit of the LLC module by adopting a phase-shifting and frequency modulation hybrid control method to obtain optimized output voltage and output current.
Detecting a resonant circuit, and switching to a phase shift mode when the resonant voltage or current is reduced to the lowest value of a PFM (Pulse frequency modulation) mode; when the voltage or the current rises to the highest value of the phase-shifting mode, the PFM mode is switched.
Preferably, the lowest value of the resonant voltage or current in the PFM mode is smaller than the highest value of the resonant voltage or current in the phase-shift mode.
Compared with the prior art, the invention has the following advantages:
(1) and (3) controlling and stabilizing: based on a hybrid control mode of the LLC full-bridge resonant circuit, when the voltage or the current is reduced to the lowest value of a phase-shift mode, the control circuit is switched to the phase-shift mode, when the voltage or the current is increased to the highest value of the phase-shift mode, the control circuit is switched to the PFM mode, the lowest value of the PFM mode is lower than the highest value of the phase-shift mode, and therefore a buffer area is formed, the circuit can be switched smoothly, and unstable oscillation of a single-state switching point is avoided;
(2) the parameter design is accurate: according to the invention, the circuit parameters are optimized by using a particle swarm optimization algorithm, and compared with the existing design optimization method, more accurate parameter values can be obtained, so that the parameter design of a common LLC resonant converter is more applicable;
(3) the operation is more stable: the invention utilizes the hybrid control method to modulate the optimized circuit, and the hybrid control method is combined with accurate parameter values, so that the circuit can run more stably, and further the damage of a switching tube is reduced.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a schematic flow chart of a particle swarm algorithm;
fig. 3 is a circuit diagram of an LLC module in a DC/DC circuit.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
As shown in fig. 1, the present invention relates to a parameter optimization method for an LLC module in a DC/DC circuit, comprising the following steps:
step one, performing parameter optimization on an LLC module in a DC/DC circuit based on a particle swarm optimization;
in a three-dimensional coordinate system, a functional relation Is established by taking the resonant current Is, the resonant switching frequency fr and the resonant inductance Lr as variables, and an optimal solution Is found out through a particle swarm algorithm. The basic principle of the particle swarm optimization is as follows:
(1) initializing a particle swarm;
(2) calculating the fitness;
(3) updating the current individual optimum and the group optimum;
(4) updating speed and position;
(5) and (4) judging whether the current end condition is met, if so, finishing the optimization, and otherwise, returning to the step (2).
Assuming a d-dimensional search space, Y particles are randomly generated to form a population S, and the velocity vector of the Y-th (Y-1, 2, L, Y) particle can be expressed as Vy (Vy)1，Vy2，L，Vyd) The position vector is (Xy) ═ Xy1，Xy2，L，Xyd) The current optimal position of the individual is Py ═ (Py)1，Py2，L，Pyd) Global optimum position Pg ═ Pg (Pg)1，Pg1，L，Pgd) The particle update formula is as follows:
Vyd(t+1)＝ωVyd(t)+c1r1(Pyd(t)-Xyd(t))+c2r2(Pgd(t)-Xyd(t))
Xyd(t+1)＝Xyd(t)+Vyd(t+1)
in the formula, t is the number of iterations. And omega is an inertia weight and controls the influence degree of the speed on the movement at the previous moment. c. C1、c2Are cognitive factors and social factors respectively, and restrict the strength of the particles influenced by the particles and the population. r is1、r2Is a random number between 0 and 1 and represents an uncertainty factor. Vyd(t) represents the velocity of the Y-th particle in d-dimension. Xyd(t) represents the d-dimensional position of the Y-th particle. The transformation ratio n of the circuit transformer and the excitation inductance Lm are determined, so that the resonant current Is can be determined to be a function of the resonant switching frequency fr and the resonant inductance Lr, a functional relation Is established by taking the resonant current Is, the resonant switching frequency fr and the resonant inductance Lr as variables, and an optimal solution Is found out through a particle swarm algorithm.
The expression of the optimal solution is:
Figure BDA0001925198140000041
Figure BDA0001925198140000042
Figure BDA0001925198140000043
Lm＝mLr
in the formula, Cr is capacitance value of resonant capacitor, Rac is resistance value of AC equivalent load resistor, Lr is inductance value of resonant inductor, Lm is inductance value of excitation inductor, fs is resonant frequency, R isLdThe dc-side load resistance is Q, m and pi are constant coefficients, respectively.
And step two, controlling a switching tube in a main circuit of the LLC module by adopting a phase-shifting and frequency modulation hybrid control method to obtain optimized more accurate output voltage and output current.
Detecting a resonant circuit, and switching to a phase shift mode when the resonant voltage or current is reduced to the lowest value of the PFM mode; when the voltage or the current rises to the highest value of the phase-shifting mode, the PFM mode is switched. The lowest value of the PFM mode should be lower than the highest value of the phase-shifting mode, so as to form a buffer area, so that the circuit can be switched smoothly, and unstable oscillation of a single-state switching point is avoided.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and those skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (1)

1. A method for optimizing parameters of an LLC module in a DC/DC circuit, the method comprising the steps of:
1) parameter optimization is carried out on LLC modules in the DC/DC circuit by adopting a particle swarm algorithm to obtain resonant current IsResonant switching frequency frResonant inductor LrEstablishing a functional relation for the variables, and finding out an optimal solution through a particle swarm algorithm, wherein the expression of the optimal solution is as follows:
Figure FDA0002906512490000011
Figure FDA0002906512490000012
Figure FDA0002906512490000013
Lm＝mLr
in the formula, Cr is capacitance value of resonant capacitor, Rac is resistance value of AC equivalent load resistor, Lr is inductance value of resonant inductor, Lm is inductance value of excitation inductor, fs is resonant frequency, R isLdThe direct current side load resistance is Q, m and pi are constant coefficients respectively;
2) detecting the resonant circuit, switching to a phase shift mode when the resonant voltage or current is reduced to the lowest value of the PFM mode, and switching to the PFM mode when the voltage or current is increased to the highest value of the phase shift mode, wherein the lowest value of the resonant voltage or current in the PFM mode is smaller than the highest value of the resonant voltage or current in the phase shift mode; and modulating a switching tube in a main circuit of the LLC module by adopting a phase-shifting and frequency modulation hybrid control method to obtain optimized output voltage and output current.
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