CN112600435B - Fusion type multiport resonant power conversion system - Google Patents

Fusion type multiport resonant power conversion system Download PDF

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CN112600435B
CN112600435B CN202011432510.8A CN202011432510A CN112600435B CN 112600435 B CN112600435 B CN 112600435B CN 202011432510 A CN202011432510 A CN 202011432510A CN 112600435 B CN112600435 B CN 112600435B
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power transmission
resonance
power
composite
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CN112600435A (en
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钱挺
郭凯
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Tongji University
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Tongji University
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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
    • 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
    • H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention relates to a fusion type multiport resonant power conversion system which comprises a power conversion unit, a power transmission unit, a composite transformer unit and a secondary side rectification unit which are sequentially connected, wherein a power supply pack is arranged between the power conversion unit and the power transmission unit, the secondary side rectification unit is connected with a load, a plurality of composite resonance groups are formed among the power transmission units, and the equivalent resonance parameters of the composite resonance groups are changed by adjusting the time sequence of control signals of the power transmission units, so that the power distribution and the integral output of the composite transformer unit are changed, and the aim of adjusting the output voltage or current is fulfilled. Compared with the prior art, the invention has the advantages of improving the energy supply efficiency of the system, being suitable for the high-frequency working environment and the like.

Description

Fusion type multiport resonant power conversion system
Technical Field
The invention relates to the technical field of power electronics, in particular to a fusion type multi-port resonant power conversion system.
Background
Modern switching power supplies are essential components widely used in the industrial field, and high frequency and high power density are the development directions of the modern switching power supplies. In the field of wireless charging, which is one of the application scenarios, a resonant converter is often used for high-power wireless charging (this method is used for charging most electric vehicles), and the resonant converter with high power density can greatly reduce the volume and cost of the system. In the field of new energy power generation, higher power density is also a consistent goal. The new energy is used as clean renewable energy, and the power generation process is realized by using the existing energy transmission technology by means of energy sources such as solar energy, wind energy, biomass energy and the like. In standalone photovoltaic systems, the bus bar converter and the battery charge converter are typically integrated into one multi-port system to optimize the performance of the standalone photovoltaic system. Conventional solutions typically utilize an isolated DC-DC topology with a high voltage output to power the inverter and a one-stage bidirectional non-isolated converter in parallel on the input side for battery charge management. However, in practical applications, photovoltaic systems typically discharge the cells when there is insufficient illumination on the photovoltaic panel. And the multi-stage power conversion can seriously affect the efficiency of the system.
Meanwhile, the resonant converter is used as a high-frequency, high-power-density and high-efficiency DC-DC power converter, and zero voltage conduction (ZVS) and zero current turn-off (ZCS) of a main switching tube can be realized in a full-load range. Therefore, it is of practical significance to use LLC resonant topologies with high power density and with a lower number of power conversion stages.
Disclosure of Invention
The invention aims to overcome the defect of low energy supply efficiency of the prior art and provide a fusion type multi-port resonant power conversion system.
The purpose of the invention can be realized by the following technical scheme:
a power pack is arranged between the power conversion unit and the power transmission unit, the secondary side rectification unit is connected with a load, a plurality of composite resonance groups are formed among the power transmission units, and equivalent resonance parameters of the composite resonance groups are changed by adjusting the time sequence of control signals of the power transmission units, so that the power distribution and the integral output of the composite transformer unit are changed, and the purpose of adjusting output voltage or current is achieved.
The power transmission unit transmits energy to the secondary side rectifying unit through the composite transformer unit, and the energy is provided for a load after passing through the secondary side rectifying unit.
The power conversion unit is a dual-port or three-port or multi-port power unit. The system or partial combination may not use the power conversion unit described above. The power conversion units may also be multiplexed in different groups.
And part or all of the components are shared or not shared between the power conversion unit and the power transmission unit.
The number of the power transmission units is the same as or different from the number of the composite resonance groups, and some of the power transmission units may be used simultaneously in different composite resonance groups.
The single composite resonance is a combined structure that one or more power transmission units generate mutual influence through two or more resonance units, so that the multiple power transmission units generate coupling.
Further, the form of the combined structure comprises combined connection, sharing or mutual nesting of the resonance units and adding an additional connection network.
Further, the type of the resonance unit comprises LC, LLC, CLC or CLLC.
Further, the type of the additional connection network comprises an inductive, capacitive or resonant network.
The power pack includes a photovoltaic, battery, or other voltage or current source.
The specific structure of the composite transformer unit is a combination of one or more transformers, or a combination of one or more coils or antennas for wireless power transmission, or a combination of a transformer and a coil or antenna for wireless power transmission.
The participating resonance mode of the single power conversion unit comprises participating in a plurality of composite resonance groups or existing as a non-resonance type unit.
The composite resonance group comprises a single power transmission unit which is a composite resonance and is only a single-path resonance.
The control mode of the power transmission unit comprises fixed switching frequency control or dynamic switching frequency control.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the independent power transmission units are arranged at each port, and the equivalent resonance parameters of the composite resonance group are changed by adjusting the time sequence of the control signals of the power transmission units, so that the power distribution and the integral output of the composite transformer unit are changed, the energy supply efficiency of the system is improved, and meanwhile, the composite transformer unit has higher working frequency, is suitable for a high-frequency working environment, and has the advantages of high frequency and high power density.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram according to a first embodiment of the present invention;
FIG. 3 is a waveform diagram illustrating an exemplary embodiment of the present invention;
FIG. 4 is a circuit diagram of a mode 1 according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of a mode 2 according to an embodiment of the present invention;
FIG. 6 is a circuit diagram of a mode 3 according to an embodiment of the present invention;
FIG. 7 is a circuit diagram of mode 4 according to an embodiment of the present invention;
FIG. 8 is a circuit diagram of a mode 5 according to an embodiment of the present invention;
FIG. 9 is a circuit diagram of a mode 6 according to an embodiment of the present invention;
FIG. 10 is a graph comparing the system efficiency at 0W of photovoltaic output for photovoltaic voltage in accordance with one embodiment of the present invention;
FIG. 11 is a graph comparing the system efficiency at 40W of photovoltaic output for photovoltaic voltage in accordance with one embodiment of the present invention;
FIG. 12 is a graph comparing the system efficiency at 120W photovoltaic output with the system efficiency at photovoltaic voltage in accordance with one embodiment of the present invention;
FIG. 13 is a graph comparing the efficiency of a photovoltaic output of 0W with that of a conventional resonant converter according to a first embodiment of the present invention;
FIG. 14 is a graph comparing the efficiency of a 40W photovoltaic output with that of a conventional resonant converter according to a first embodiment of the present invention;
fig. 15 is a graph comparing the efficiency of the photovoltaic output 120W with that of the conventional resonant converter according to the first embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, a fusion type multi-port resonant power conversion system includes a power conversion unit, a power transmission unit, a composite transformer unit and a secondary rectification unit connected in sequence, a power supply pack is arranged between the power conversion unit and the power transmission unit, the secondary rectification unit is connected with a load, a plurality of composite resonance groups are formed among the power transmission units, and by adjusting the time sequence of control signals of the power transmission unit, equivalent resonance parameters of the composite resonance groups are changed, so that the power distribution and the overall output of the composite transformer unit are changed, and the purpose of adjusting output voltage or current is achieved.
The power transmission unit transmits energy to the secondary side rectifying unit through the composite transformer unit, and the energy is provided for a load after passing through the secondary side rectifying unit.
The power conversion unit is a power unit with two ports, three ports or multiple ports.
And part or all of the components are shared or not shared between the power conversion unit and the power transmission unit.
The number of power transfer elements may be the same or different from the number of composite resonant groups and some of the power transfer elements may be used simultaneously in different composite resonant groups.
The single composite resonance is a combined structure that one or more power transmission units can mutually influence through two or more resonance units, so that the multiple power transmission units are coupled.
The form of the composite structure includes composite connection, sharing or nesting of resonance units, and adding additional connection network.
The type of resonant unit includes LC, LLC, CLC or CLLC.
Types of additional connection networks include inductive, capacitive or resonant networks.
The power pack includes a photovoltaic, battery, or other voltage or current source.
The specific structure of the composite transformer unit is a combination of one or more transformers, or a combination of one or more coils or antennas for wireless power transmission, or a combination of a transformer and a coil or antenna for wireless power transmission.
The mode of participating in resonance of a single power conversion unit includes participating in multiple complex resonance groups or existing as a non-resonant unit.
The composite resonance group comprises a single power transmission unit which is a composite resonance and only a single-path resonance.
The control mode of the power transmission unit comprises fixed switching frequency control or dynamic switching frequency control.
Example one
As shown in fig. 2, the present embodiment includes a unidirectional four-switch buck-boost, a first stage boost and two resonant half-bridges, and the four-switch buck-boost and boost are controlled by the PWM mode to realize the adjustment of the circuit gain. The resonant parameters of the two resonant half-bridges are in resonant coupling, and the aim of power distribution is fulfilled by adjusting the control signals. Wherein Q is 1 ～Q 4 Is a resonant network switching tube, Q 01 ～Q 04 Is a non-resonant networkSwitching tube, L r1 And L r2 Is a resonant inductor, L 1 And L 2 Is a boost inductor and a four-switch buck boost inductor, C r Is a resonant capacitor, C 1 Is a blocking capacitor, T 1 And T 2 Is a transformer with turn ratio of N p1 :N s1 And N p2 :N s2 ，L M1 And L M2 Are each T 1 And T 2 Excitation inductance of D 1 ～D 4 Is a rectifier diode, D 01 ～D 02 Is a freewheeling diode, C in Is an input filter capacitor, C o1 Is an intermediate bus filter capacitor, C o Is the output filter capacitance.
A typical waveform diagram for this embodiment is shown in FIG. 3, which shows the operating characteristics of a coupled resonant half bridge in FIG. 3, where v GS1 ～v GS4 Are each Q 1 ～Q 4 Drive waveform of (i) L1 And i L2 Are each L 1 And L 2 Current waveform of (i) M1 And i M2 Are each T 1 And T 2 Excitation current waveform of (i) s1 And i s2 Respectively, the current waveforms rectified by the secondary side.
In one switching period, the invention can be divided into 12 working modes, wherein t 0 ～t 3 And t 6 ～t 9 Is a phase shift angle T FS ，t 2 ～t 3 、t 5 ～t 6 、t 8 ～t 9 And t 11 ～t 12 Is the dead time t dead With a negligible dead time, the duty cycle of both resonant half-bridges is 50%, so the transformer T 1 And T 2 There is no dc bias. t is t 6 ～t 11 Working mode of and t 0 ～t 5 Corresponding modes 1 to 6 are similar, t 12 At that time, one switching cycle ends and the next switching cycle begins. t is t 0 ～t 5 The corresponding modes 1 to 6 are specifically as follows:
as shown in FIG. 4, modality 1 corresponds to t 0 Time of day, switch tube Q 1 Conduction, Q in this mode 2 And Q 3 In the off state, Q 4 In the on state, v Tp1 Clamped by the secondary rectifying unit, the upper half-bridge starts to resonate, D of the secondary rectifying unit 1 And D 4 Conduction, i L1 And i M1 The difference value of the secondary side rectification unit is transmitted to the secondary side rectification unit;
as shown in FIG. 5, modality 2 corresponds to t 1 Time, i L2 Resonates to and i M2 D of equal, secondary side rectifying unit 5 And D 8 Are all off, i L2 And i M2 Starting to rise slowly;
as shown in FIG. 6, mode 3 is the dead time, t, of the lower resonant half bridge 2 Time of day, switch tube Q 4 Is turned off due to i M2 Smaller, as ZCS, current i L2 Transfer to Q 3 To realize Q 3 ZVS of (1);
as shown in FIG. 7, modality 4 corresponds to t 3 Time of day, switch tube Q 3 Conduction, Q in this mode 2 And Q 4 In an off state, Q 1 In the on state, T 2 Clamped by the secondary rectifying unit, the lower side resonance half bridge starts to resonate, and D of the secondary rectifying unit 6 And D 7 Conduction, i L2 And i M2 The difference value of the secondary side rectification unit is transmitted to the secondary side rectification unit;
as shown in FIG. 8, modality 5 corresponds to t 4 Time, i L1 Resonant sum of M1 Equal, minor edge D 1 And D 4 Opening, i L1 And i M1 Starting to rise slowly;
as shown in FIG. 9, mode 6 is the dead time, t, of the upper resonant half bridge 5 At the moment, the switching tube Q1 is turned off due to i M1 Smaller, as ZCS, current i L1 Transfer to Q 2 To realize Q 2 ZVS of (1).
In the aspect of converter gain, because the resonance parameters of the two resonance half bridges are coupled, for the two resonance half bridges, the actual resonance parameters are no longer determined by resonance inductance and resonance capacitance completely, the equivalent resonance capacitance is related to a phase shift angle, and because the value of the equivalent resonance capacitance directly affects the resonance state of the LLC resonance converter, the antecedent term can occupy more power, thereby achieving the purpose of adjusting power distribution.
The photovoltaic input of the embodiment is 70V-130V (the rated input is 100V), the output is 380V/160W, and the comparison is carried out with the traditional three-port LLC resonant converter. Table 1 shows the main parameters of the present example, which are as follows:
TABLE 1 example A Primary parameters Table
Figure BDA0002827039920000051
Figure BDA0002827039920000061
As shown in fig. 10-12, the present embodiment achieves high efficiency power transfer while achieving power distribution at photovoltaic outputs of 0W, 40W, 120W as a whole system. As shown in fig. 13-15, compared with the conventional three-port LLC resonant converter, the efficiency of the present embodiment is already a certain advantage at the photovoltaic input of 120W, while at the photovoltaic inputs of 0W and 40W, the efficiency of the present embodiment is significantly advantageous, and the efficiency is improved by about 4% to 5% compared with the conventional three-port LLC resonant converter. In addition, the embodiment adopts a fixed-frequency working mode, so that the optimal design of the magnetic element can be simplified; meanwhile, the high-frequency high-power-density antenna has the advantages of being high in working frequency and suitable for high-frequency working environment so as to achieve high frequency and high power density.
The related system may not use the power conversion unit of fig. 1 or fig. 2.
The power conversion unit (or a portion of the power conversion unit) in fig. 1 or fig. 2 may not be used.
In addition, it should be noted that the specific implementation examples described in this specification may have different names, and the above contents described in this specification are only illustrations of the structures of the present invention. All equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the invention. Various modifications or additions may be made to the described embodiments or methods may be similarly employed by those skilled in the art without departing from the scope of the invention as defined in the appending claims.

Claims (4)

1. A fusion type multiport resonant power conversion system is characterized by comprising a power conversion unit, a power transmission unit, a composite transformer unit and a secondary side rectification unit which are sequentially connected, wherein a power supply pack is arranged between the power conversion unit and the power transmission unit, the secondary side rectification unit is connected with a load, a plurality of composite resonance groups are formed among the power transmission units, and the equivalent resonance parameters of the composite resonance groups are changed by adjusting the time sequence of control signals of the power transmission units, so that the power distribution and the integral output of the composite transformer unit are changed, and the aim of adjusting output voltage or current is fulfilled;
the power conversion unit is a power unit with two ports, three ports or multiple ports;
the single composite resonance is specifically a combined structure which can be mutually influenced by one or more power transmission units through two or more resonance units, and the form of the combined structure comprises combined connection, sharing or mutual nesting of the resonance units and addition of an additional connection network;
the specific structure of the composite transformer unit is a combination of one or more transformers, or a combination of one or more coils or antennas for wireless power transmission, or a combination of a transformer and a coil or antenna for wireless power transmission;
part or all of components are shared or not shared between the power conversion unit and the power transmission unit;
the number of the power transmission units is the same as or different from that of the composite resonance groups, and part of the power transmission units are used in different composite resonance groups at the same time;
the mode of participating in resonance of a single power conversion unit includes participating in multiple complex resonance groups or existing as a non-resonant unit.
2. The integrated multi-port resonant power conversion system of claim 1, wherein the power pack comprises photovoltaic, battery or other voltage or current source.
3. The fusion type multi-port resonant power conversion system according to claim 1, wherein the composite resonance group comprises a single power transmission unit which is a composite resonance and only a single-path resonance.
4. The integrated multi-port resonant power conversion system according to claim 1, wherein the power transmission unit is controlled by a fixed switching frequency control or a dynamic switching frequency control.
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