CN209767388U - Multiphase parallel resonant converter capable of automatically equalizing current - Google Patents
Multiphase parallel resonant converter capable of automatically equalizing current Download PDFInfo
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- CN209767388U CN209767388U CN201920215400.2U CN201920215400U CN209767388U CN 209767388 U CN209767388 U CN 209767388U CN 201920215400 U CN201920215400 U CN 201920215400U CN 209767388 U CN209767388 U CN 209767388U
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Abstract
The utility model provides a but heterogeneous parallel resonance converter of automatic flow equalizing, each resonance converter's resonant transformer all has two the same secondary windings: a first secondary winding and a second secondary winding; all the first secondary windings are connected in series and then connected to the input end of the first-phase rectifying circuit; all the second secondary windings are connected in series and then connected to the input of the second phase rectification circuit. The utility model has the advantages that: the high-power parallel switch power supply realizes automatic equalization of the current of each branch of the multiphase parallel resonant converter, ensures equal power distribution of each branch, is used for occasions such as electric vehicles, hybrid vehicles, uninterrupted power supplies, power quality adjusting power supplies, aviation power supplies, new energy power generation, superconducting energy storage and the like, and has the advantages of low loss, high efficiency, avoidance of local overheating of a switch tube or a rectifier diode or overhigh voltage and current stress of a device and the like.
Description
Technical Field
The patent relates to a multiphase parallel power electronic resonance converter capable of automatically equalizing current, which can realize the automatic current equalization of each parallel branch.
Technical Field
In recent years, switching power supplies for supplying electric energy to various electric devices are developing toward low voltage, large current, small volume, light weight, high efficiency, thinning and integration, and include a voltage regulation module for supplying a precise power supply to high-precision and high-speed microprocessors such as a Central Processing Unit (CPU) and a Digital Signal Processor (DSP) of a computer, and a switching power supply which is widely applied to occasions such as an electric vehicle, a hybrid vehicle, an uninterruptible power supply, an electric energy quality regulation power supply, an aviation power supply, new energy power generation, superconducting energy storage and the like in recent years, and the switching power supplies enable a switching tube to be turned on at zero voltage and turned off at zero current in a full load range by adopting a circuit topology structure of a resonant converter, so that loss is reduced and efficiency is improved. In order to implement high-power application of the resonant converter, people often adopt a two-phase or multi-phase parallel resonant converter circuit topology structure, but because the resonant capacitance or resonant inductance parameters of each parallel branch of the resonant converter are inconsistent, the currents of the branches are unequal, the power distribution of the branches is unequal, and serious problems of local overheating of a switching tube or a rectifier diode, overhigh voltage and current stress of a device and the like are caused.
disclosure of Invention
aiming at the defects of the prior art, the patent provides the multiphase parallel resonant converter capable of automatically equalizing the current, and the multiphase parallel resonant converter has the advantages of simple structure, low loss, high efficiency, capability of realizing the automatic current equalization of each parallel branch and the like.
The technical scheme adopted by the patent for solving the technical problem is as follows:
An auto-current sharing multiphase parallel resonant converter, comprising:
the first Phase resonant converter Phase1 comprises a first switch circuit S 1, a first resonant capacitor C 1, a first resonant inductor L r1, a first resonant transformer T 1, a first equivalent excitation inductor L m1 and a first rectifying circuit R 1, wherein the first equivalent excitation inductor L m1 is connected in parallel with two ends a and b of a primary winding N P1 of the first resonant transformer T 1, the first resonant capacitor C 1, the first resonant inductor L r1 and the first resonant transformer T 1 are connected in series to form a first resonant unit, the first switch circuit S 1 is provided with an input port 1-1 and an output port 1-2, and the first rectifying circuit R 1 is provided with an input port 1-3 and an output port 1-4;
the second Phase resonance converter Phase2 comprises a second switch circuit S 2, a second resonance capacitor C 2, a second resonance inductor L r2, a second resonance transformer T 2, a second equivalent excitation inductor L m2 and a second rectification circuit R 2, wherein the second equivalent excitation inductor L m2 and the second rectification circuit R 2 are connected in parallel at two ends g and h of a primary winding N P2 of the second resonance transformer T 2, the second resonance capacitor C 2, the second resonance inductor L r2 and the second resonance transformer T 2 are connected in series to form a second resonance unit, the second switch circuit S 2 is provided with an input port 2-1 and an output port 2-2, and the second rectification circuit R 2 is provided with an input port 2-3 and an output port 2-4;
The method is characterized in that:
The first resonant transformer T 1 has two identical secondary windings N S11 and N S12, the second resonant transformer T 2 has two identical secondary windings N S21 and N S22, the secondary windings N S11 and N S21 are connected in series and then connected to the input terminals 1-3 of the first rectifier circuit R 1, and the secondary windings N S12 and N S22 are connected in series and then connected to the input terminals 2-3 of the second rectifier circuit R 2.
The beneficial effect of this patent lies in: the patent provides a multiphase parallel resonance converter capable of automatically equalizing current, wherein a first-phase resonance transformer and a second-phase resonance transformer of the converter are both provided with two identical secondary windings, and the first secondary winding of the first-phase resonance transformer and the first secondary winding of the second-phase resonance transformer are connected in series and then connected to an input port of a first-phase rectification circuit; the second secondary winding of the first phase resonance transformer and the second secondary winding of the second phase resonance transformer are connected in series and then connected to the input port of the second phase rectification circuit, so that the total secondary current of the first phase resonance transformer and the total secondary current of the second phase resonance transformer can be ensured to be equal, the primary current of the first phase resonance transformer and the primary current of the second phase resonance transformer are ensured to be equal, the output current of the first phase rectifier and the output current of the second phase rectifier are ensured to be equal, the automatic balancing of the branch currents of the multi-phase parallel resonance converter is realized, the high-power switching power supply is used for a high-power switching power supply, and the high-power switching power supply has the advantages of low loss, high efficiency, avoidance of local overheating of a switching tube or a rectifying diode or overhigh voltage of a.
The following embodiments are described in detail with reference to the accompanying drawings.
Description of the figures and accompanying tables
In order to more clearly explain the embodiments, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings described below are only some embodiments of the patent, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a circuit topology diagram of a multiphase parallel resonant converter capable of automatically equalizing currents according to an embodiment of the present invention.
Fig. 2 is a circuit topology diagram of a multiphase parallel resonant converter capable of automatically equalizing currents according to the second embodiment of the present disclosure.
Fig. 3 is a circuit topology diagram of a conventional multiphase parallel resonant converter corresponding to fig. 1, in which the resonant transformer has only a single secondary winding, and the multiphase parallel resonant converter cannot realize automatic current sharing.
Fig. 4 is a two-phase non-uniform resonant current simulation waveform of fig. 3.
Fig. 5 is a two-phase current-sharing resonant current simulation waveform of fig. 1.
fig. 6 is a rectified current simulation waveform of the two-phase non-uniform current of fig. 3.
Fig. 7 is a two-phase current-sharing rectified current simulation waveform of fig. 1.
Fig. 8 is a two-phase current-sharing resonance current experimental waveform of fig. 1.
fig. 9 is a two-phase current-sharing rectified current experimental waveform of fig. 1.
Table 1 shows the two-phase asymmetric resonant cell parameters of the conventional single secondary winding-only resonant converter of fig. 3 and the resonant converter with dual secondary windings of fig. 1.
TABLE 1
Table 2 shows two unbalanced resonant currents of the conventional resonant converter of fig. 3 having only a single secondary winding and two balanced resonant currents of the resonant converter of fig. 1 having two secondary windings under the parameters of the asymmetric resonant cells of table 1.
TABLE 2
Table 3 shows two unbalanced rectified currents of the conventional resonant converter of fig. 3 having only a single secondary winding, and two balanced rectified currents of the resonant converter of fig. 1 having two secondary windings, under the asymmetric unit parameters of table 1.
TABLE 3
In the figure, Phase 1-a first branch of a multiphase parallel resonant converter, S 1 -a first switching circuit, C 1 -a first resonant capacitor, L r1 -a first resonant inductor, T 1 -a first resonant transformer, N P1 -a primary winding of a first resonant transformer T 1, two secondary windings of N S11 and N S12 -a first resonant transformer T 1, L m1 -an equivalent excitation inductor connected in parallel at two ends a and b of the primary winding N P1, R 1 -a first rectifying circuit, 1-1-an input port of the first switching circuit S 1, 1-2-an output port of the first switching circuit S 1, 1-3-an input port of the first rectifying circuit R 1, 1-4-an output port of the first rectifying circuit R 1, C P1 -a first parallel resonant capacitor, i Lr1 -current of the first branch, i rect1 -rectified current of the first branch;
Phase 2-a second branch of the multiphase parallel resonant converter, S 2 -a second switch circuit, C 2 -a second resonant capacitor, L r2 -a second resonant inductor, T 2 -a second resonant transformer, N P2 -a primary winding of the second resonant transformer T 2, two secondary windings of N S21 and N S22 -a second resonant transformer T 2, L m2 -an equivalent excitation inductor connected in parallel at two ends g and h of the primary winding N P2, R 2 -a second rectifying circuit, 2-1-an input port of the second switch circuit S 2, 2-2-an output port of the second switch circuit S 2, 2-3-an input port of the second rectifying circuit R 2, 2-4-an output port of the second rectifying circuit R 2, C P2 -a second parallel resonant capacitor, i Lr2 -a resonant current of the second branch, and rect2 -a rectified current of the second branch.
Detailed Description
The core idea of the patent is that secondary windings of two resonance transformers of a multi-phase parallel resonance converter are respectively divided into two parts, and a first secondary winding of a first resonance transformer and a first secondary winding of a second resonance transformer are connected in series and then connected to an input port of a first rectification circuit; and the second secondary winding of the first resonance transformer and the second secondary winding of the second resonance transformer are connected in series and then connected to the input port of the second rectifying circuit to ensure that the total secondary currents of the first resonance transformer and the second resonance transformer are equal, so that the primary current of the first resonance transformer and the primary current of the second resonance transformer are equal, the output current of the first rectifier and the output current of the second rectifier are equal, and the automatic balancing of the branch currents of the multi-phase parallel resonance converter is realized.
The technical solutions in the embodiments of the present patent are clearly and completely described below with reference to the drawings in the embodiments of the present patent, and it is obvious that the described embodiments are only a part of the embodiments of the present patent, and not all of the embodiments. Based on the core ideas and the embodiments of the patent, other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the patent.
In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present patent, but it will be understood by those skilled in the art that the present patent may be practiced without these specific details.
The first embodiment is as follows:
referring to fig. 1, a multiphase parallel resonant converter capable of automatically equalizing current includes:
the first Phase resonant converter Phase1 comprises a first switch circuit S 1, a first resonant capacitor C 1, a first resonant inductor L r1, a first resonant transformer T 1, a first equivalent excitation inductor L m1 and a first rectifying circuit R 1, wherein the first equivalent excitation inductor L m1 is connected in parallel to two ends a and b of a primary winding N P1 of the first resonant transformer T 1, the first resonant capacitor C 1, the first resonant inductor L r1 and the first resonant transformer T 1 are connected in series to form a first resonant unit, the first switch circuit S 1 is provided with an input port 1-1 and an output port 1-2, and the first rectifying circuit R 1 is provided with an input port 1-3 and an output port 1-4.
The second Phase resonance converter Phase2 comprises a second switch circuit S 2, a second resonance capacitor C 2, a second resonance inductor L r2, a second resonance transformer T 2, a second equivalent excitation inductor L m2 and a second rectification circuit R 2, wherein the second equivalent excitation inductor L m2 and the second rectification circuit R 2 are connected in parallel to two ends g and h of a primary winding N P2 of the second resonance transformer T 2, the second resonance capacitor C 2, the second resonance inductor L r2 and the second resonance transformer T 2 are connected in series to form a second resonance unit, the second switch circuit S 2 is provided with an input port 2-1 and an output port 2-2, and the second rectification circuit R 2 is provided with an input port 2-3 and an output port 2-4.
The first resonant transformer T 1 has two identical secondary windings N S11 and N S12, the second resonant transformer T 2 has two identical secondary windings N S21 and N S22, the secondary windings N S11 and N S21 are connected in series and then connected to input ports 1-3 of the first rectifying circuit R 1, the secondary windings N S12 and N S22 are connected in series and then connected to input ports 2-3 of the second rectifying circuit R 2, and the multiphase parallel LLC resonant converter capable of automatically equalizing current is formed.
The two identical secondary windings are identical in structure, equal in number of turns, identical in shape of wires and equal in cross-sectional area.
the embodiment of the present invention is described with reference to FIGS. 3 to 9 and attached tables 1 to 3.
As can be seen from attached table 1, for the circuit topology of the transformer proposed by the present patent shown in fig. 1 having two secondary windings and the circuit topology of the conventional transformer shown in fig. 3 having one secondary winding, when the resonant cell parameters C 2, L r2, L m2 of the second phase are increased by 10% compared to the resonant cell parameters C 1, L r1, L m1 of the first phase:
As can be seen from fig. 4 and fig. 5, the circuit simulation waveforms (fig. 4) of the two-phase resonant currents i Lr1 and i Lr2 of the conventional circuit topology (fig. 3) are very different and unbalanced, while the circuit simulation waveforms (fig. 5) of the two-phase resonant currents i Lr1 and i Lr2 of the circuit topology (fig. 1) proposed by the present invention are very small and balanced, as can be seen from table 2, the current sharing error of the resonant current of the conventional circuit topology (fig. 3) reaches 55.8%, while the current sharing error of the resonant current of the circuit topology (fig. 1) proposed by the present invention is only 5.3%.
As can be seen from fig. 6 and fig. 7, the simulated waveforms (fig. 6) of the two-phase rectified currents i rect1, i rect2 of the conventional circuit topology (fig. 3) are very different, wherein the first phase bears the whole rectified current, and the second phase has no rectified current and is very unbalanced, while the simulated waveforms (fig. 7) of the two-phase rectified currents i rect1, i rect2 of the circuit topology (fig. 1) proposed by the present patent are completely identical and are very balanced, as can be seen from table 4, the current sharing error of the rectified current of the conventional circuit topology (fig. 3) reaches 100%, and the current sharing error of the rectified current of the circuit topology (fig. 1) proposed by the present patent is 0.
The implementation effect of the first embodiment is verified through circuit simulation (fig. 4-7).
As shown in fig. 8, the experimental waveforms of the two-phase resonant currents i Lr1 and i Lr2 of the circuit topology (fig. 1) proposed by the present patent are very small and balanced.
as can be seen from fig. 9, the experimental waveforms of the two-phase rectified currents i rect1 and i rect2 of the circuit topology (fig. 1) proposed by the present patent are very small and balanced.
The above experiment by the experimental prototype (fig. 8-9) verifies the implementation effect of the first embodiment.
Example two:
Referring to fig. 2, in the multiphase parallel resonant converter capable of automatically equalizing currents, a first equivalent excitation inductor L m1 in fig. 1 is replaced by a first parallel resonant capacitor C P1, and a second equivalent excitation inductor L m2 is replaced by a second parallel resonant capacitor C P2, so that the multiphase parallel resonant converter capable of automatically equalizing currents is formed.
The above-described embodiments are merely preferred embodiments of this patent and are not intended to limit the scope of the patent. The principle and implementation of the present patent are described in the present specification by applying the above embodiments, and are only used to help understand the method and core idea of the present patent; meanwhile, for a person skilled in the art, the specific embodiments and the application range may be changed according to the idea of the present patent. Therefore, the content of the present specification should not be construed as limited to the present patent, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present patent are included in the scope of the present patent.
Claims (2)
1. An auto-current sharing multiphase parallel resonant converter, comprising:
the first Phase resonant converter Phase1 comprises a first switch circuit S 1, a first resonant capacitor C 1, a first resonant inductor L r1, a first resonant transformer T 1, a first equivalent excitation inductor L m1 and a first rectifying circuit R 1, wherein the first equivalent excitation inductor L m1 is connected in parallel with two ends a and b of a primary winding N P1 of the first resonant transformer T 1, the first resonant capacitor C 1, the first resonant inductor L r1 and the first resonant transformer T 1 are connected in series to form a first resonant unit, the first switch circuit S 1 is provided with an input port 1-1 and an output port 1-2, and the first rectifying circuit R 1 is provided with an input port 1-3 and an output port 1-4;
The second Phase resonance converter Phase2 comprises a second switch circuit S 2, a second resonance capacitor C 2, a second resonance inductor L r2, a second resonance transformer T 2, a second equivalent excitation inductor L m2 and a second rectification circuit R 2, wherein the second equivalent excitation inductor L m2 and the second rectification circuit R 2 are connected in parallel at two ends g and h of a primary winding N P2 of the second resonance transformer T 2, the second resonance capacitor C 2, the second resonance inductor L r2 and the second resonance transformer T 2 are connected in series to form a second resonance unit, the second switch circuit S 2 is provided with an input port 2-1 and an output port 2-2, and the second rectification circuit R 2 is provided with an input port 2-3 and an output port 2-4;
The method is characterized in that:
The first resonant transformer T 1 has two identical secondary windings N S11 and N S12, the second resonant transformer T 2 has two identical secondary windings N S21 and N S22, the secondary windings N S11 and N S21 are connected in series and then connected to input ports 1-3 of the first rectifying circuit R 1, the secondary windings N S12 and N S22 are connected in series and then connected to input ports 2-3 of the second rectifying circuit R 2, and the multiphase parallel LLC resonant converter capable of automatically equalizing current is formed.
2. the multiphase parallel resonant converter capable of automatically current sharing of claim 1, wherein a first excitation inductor L m1 of a first resonant transformer T 1 is replaced by a first parallel resonant capacitor C P1, and a second excitation inductor L m2 of a second resonant transformer T 2 is replaced by a second parallel resonant capacitor C P2, so that the multiphase parallel resonant converter capable of automatically current sharing is formed.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111585442A (en) * | 2019-02-15 | 2020-08-25 | 杨玉岗 | Multiphase parallel resonant converter capable of automatically equalizing current |
| CN114825940A (en) * | 2022-04-11 | 2022-07-29 | 南京航空航天大学 | Multiphase input series output parallel double-active-bridge converter capable of automatically equalizing voltage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111585442A (en) * | 2019-02-15 | 2020-08-25 | 杨玉岗 | Multiphase parallel resonant converter capable of automatically equalizing current |
| CN114825940A (en) * | 2022-04-11 | 2022-07-29 | 南京航空航天大学 | Multiphase input series output parallel double-active-bridge converter capable of automatically equalizing voltage |
| CN114825940B (en) * | 2022-04-11 | 2024-05-28 | 南京航空航天大学 | Multi-phase input series output parallel double-active-bridge converter capable of automatically equalizing voltage |
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