CN217307553U - Three-phase LLC resonant converter with ultra-wide voltage regulation range - Google Patents

Three-phase LLC resonant converter with ultra-wide voltage regulation range Download PDF

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CN217307553U
CN217307553U CN202123170522.0U CN202123170522U CN217307553U CN 217307553 U CN217307553 U CN 217307553U CN 202123170522 U CN202123170522 U CN 202123170522U CN 217307553 U CN217307553 U CN 217307553U
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杨玉岗
孙晓钰
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Abstract

The patent provides a three-phase LLC resonant converter with an ultra-wide voltage regulation range, which comprises a direct current input voltage, seven power switch tubes, three resonant inductors, three resonant capacitors, three transformers and three equivalent excitation inductors thereof, twelve rectifier diodes and an output filter capacitor; seven power switch tubes form a three-phase bridge type inverter circuit; the three resonant inductors, the resonant capacitor and the excitation inductor form a three-phase resonant tank and are connected in a triangular manner; three secondary windings of the three transformers are respectively connected with three H-bridge rectifiers which are formed by twelve diodes and connected in series, and then the three H-bridge rectifiers are connected with an output filter capacitor and a load in parallel. The beneficial effect of this patent is: the three-phase LLC resonant converter has the advantages of large power, high efficiency, narrow working frequency range, ultra-wide output voltage range, ultra-small output current ripple, ultra-small standby loss power and the like, and is widely applied to charging sources of electric automobile charging piles and the like which need high power and ultra-wide output voltage range.

Description

Three-phase LLC resonant converter with ultra-wide voltage regulation range
Technical Field
The patent relates to a three-phase LLC resonant converter with an ultra-wide voltage regulation range, and belongs to the technical field of power electronics.
Background
The rapid development of the automobile industry has intensified the energy crisis and environmental pollution, and the electric automobile emerging in recent years has relieved the situation, wherein a high-power rapid charging system has become an important research direction of the electric automobile industry. However, since the charging requirements of various electric vehicle manufacturers are not uniform, and a large amount of charging equipment can bring new impact to the power grid when being connected to the power grid, the charging equipment of the electric vehicle has requirements on high power, wide range, high efficiency and high power factor, which is one of the bottlenecks of large-scale popularization of the electric vehicle, and has important industrial value for research on electric vehicle charging piles.
The adoption of the charging module to construct the high-power quick charging system of the electric automobile is an ideal scheme in the industry, and the performance of the charging module directly influences the performance of the whole quick charging system. Currently, these charging modules are required to have a large power: 15kW, 20kW or 30 kW; ultra wide output voltage range: 200-1000V, all electric buses and passenger vehicles are compatible, and the problem of power module selection is solved for a charging pile system integration customer; ultra-high efficiency: 97 percent, the charging efficiency of the charging station is greatly improved, and great economic value is brought to a customer operation power station; ultra-small output ripple: 2V, customers do not need to worry about the influence of charging ripple voltage and current on the service life of the power battery, and especially in low environmental temperature in winter or alpine regions, the service life of the power battery of the electric automobile can be greatly prolonged by ultra-small ripples; ultra-large power density: 33.75W/in 3 The power density of the charging pile system is greatly improved, and the system design and construction cost is reduced; ultra-small standby power loss: less than 0.5 per mill of rated power, greatly reducing the operation cost of customers.
The LLC resonant converter has soft switching characteristics to achieve high efficiency, and the main circuit topology of the current charging module usually adopts an LLC resonant converter technology, but the traditional single-phase LLC resonant converter is difficult to meet high-power indexes, ultra-small output ripple indexes and ultra-large power density indexes, and the traditional three-phase LLC resonant converter is difficult to meet ultra-wide output voltage range indexes, ultra-small standby loss power and high efficiency indexes in a full load range.
Disclosure of Invention
In view of the technical defects, the patent provides a three-phase LLC resonant converter with an ultra-wide voltage regulation range, which has the advantages of simple structure, large output power, high output efficiency, large power density, narrow working frequency range, ultra-wide output voltage range, ultra-small output current ripple, ultra-small standby loss power and the like.
The technical scheme that its technical problem was solved in this patent adopts is:
a three-phase LLC resonant converter with super wide voltage regulation range which characterized in that: comprising a DC input voltage V in Seven power switch tubes Q 1 ～Q 7 And its body diode D 1 ～D 7 And parasitic capacitance C 1 ～C 7 Three resonant inductors L r1 、L r2 、L r3 Three resonant capacitors C r1 、C r2 、C r3 Resonant transformer T with three turn ratios of n 1 、T 2 、T 3 And connected in parallel to the resonance transformer T, respectively 1 、T 2 、T 3 Equivalent excitation inductance L at two ends of primary winding m1 、L m2 、L m3 Twelve rectifier diodes D 8 ～D 19 And an output filter capacitor C o (ii) a The seven power switch tubes Q 1 ～Q 7 The three-phase full-control bridge type inverter circuit forming the three-phase LLC resonant converter takes the power switch tubes as power MOSFETs as an example, and the power switch tube Q 1 Source and Q of 7 Drain electrode connection of (2), Q 7 Source and Q of 4 The drain electrodes of the three-phase full-control bridge type inverter circuit are connected to form a first bridge arm of the three-phase full-control bridge type inverter circuit; power switch tube Q 2 Source and Q of 5 The drain electrodes of the three-phase fully-controlled bridge type inverter circuit are connected to form a second bridge arm of the three-phase fully-controlled bridge type inverter circuit; power switch tube Q 3 Source and Q of 6 The drain electrodes of the three-phase fully-controlled bridge type inverter circuit are connected to form a third bridge arm of the three-phase fully-controlled bridge type inverter circuit respectively; the three bridge arms are connected in parallel, namely, the power switch tube Q is connected 1 、Q 2 、Q 3 Are all connected to oneStarting, the power switch tube Q 4 、Q 5 、Q 6 Are all connected together; the DC input voltage V in Positive pole of the power switch tube Q 1 、Q 2 、Q 3 The direct current input voltage V in Negative pole of the power switch tube Q 4 、Q 5 、Q 6 A source electrode of (a); the resonant capacitor C r1 Resonant inductor L r1 And an excitation inductance L m1 A first phase resonant tank connected in series to form the three-phase LLC resonant converter, and a resonant capacitor C r2 Resonant inductor L r2 And an excitation inductance L m2 A second phase resonant tank connected in series to form the three-phase LLC resonant converter, and a resonant capacitor C r3 Resonant inductor L r3 And an excitation inductance L m3 A third phase resonant tank of the three-phase LLC resonant converter is formed by connecting in series; the parameters of the three-phase resonance tank are equal, namely L m1 ＝L m2 ＝L m3 ，L r1 ＝L r2 ＝L r3 ，C r1 ＝C r2 ＝C r3 (ii) a The three-phase resonant tank and three resonant transformers T 1 、T 2 、T 3 The three primary windings are connected in a triangular mode, namely one end of a first phase resonance groove is connected with the Q of a first bridge arm 1 Source and Q of 7 The other end of the first phase resonance groove is connected with the Q of the second bridge arm 2 Source and Q of 5 Connection point B of the drain electrode of (1); one end of the second-phase resonance groove is connected with the other end B of the first-phase resonance groove, and the other end of the second-phase resonance groove is connected with the Q of the third bridge arm 3 Source and Q of 5 Connection point C of the drain of (1); one end of the third phase resonance groove is connected with the other end C of the second phase resonance groove, and the other end of the third phase resonance groove is connected with the Q of the first bridge arm 7 Source and Q of 4 A connection point D of the drain electrode of (1); the three resonant transformers T 1 、T 2 、T 3 Three secondary windings are respectively connected with a rectifier diode D 8 ～D 19 Three H-bridge rectifiers formed, connected in series and then connected with an output filter capacitor C o Parallel output filter capacitor C o Is connected with a load resistor R at two ends L 。
Based on three-phase LLC resonant converter with super wide voltage regulating range, its characterized in that: holding switch tube Q 6 Continuously conducting, switching tube Q 1 、Q 3 、Q 4 、Q 7 Continuously cut off, switch tube Q 2 And Q 5 Complementary conduction and working in frequency modulation state, switch tube Q 2 、Q 5 The driving signal of the switch has dead time, which not only prevents the direct connection phenomenon, but also can realize soft switching; transformer T 1 And T 3 Non-operating, transformer T 2 Working with the other end C of the primary winding directly connected to a DC input voltage V in The three-phase resonant tank only works as a second-phase resonant tank, and the input voltage at B, C ends at two ends of the second-phase resonant tank is 0-V in The square wave of the LLC resonant converter forms a single-phase half-bridge LLC resonant converter topology I, and the voltage gain of the LLC resonant converter topology I is the voltage gain of the LLC resonant converter working in a half-bridge mode; the fundamental wave equivalent circuit model of the LLC resonant converter topology I comprises: fundamental wave equivalent voltage source V BC Resonant capacitor C r2 Resonant inductor L r2 And an excitation inductor L m2 Fundamental wave equivalent load resistance R eq The fundamental wave equivalent voltage source V BC Resonant capacitor C r2 Resonant inductor L r2 And an excitation inductance L m2 In series, the fundamental equivalent load resistance R eq Connected to an excitation inductor L m2 Both ends of (a); the three H-bridge rectifiers are connected in series, with a diode D 12 ～D 15 The second H-bridge rectifier is formed to perform rectification.
Based on three-phase LLC resonant converter with super wide voltage regulating range, its characterized in that: holding switch tube Q 1 、Q 6 Continuously conducting, switching tube Q 3 、Q 4 、Q 7 Continuously disconnected, switch tube Q 2 、Q 5 Complementary conduction and working in frequency modulation state, switch tube Q 2 、Q 5 The driving signal of the switch is provided with dead time, so that the direct connection phenomenon is prevented, and the soft switching can be realized; the A end of the first phase resonance groove is directly connectedDC input voltage V in The C end of the third phase resonant tank is directly connected with a direct current input voltage V in The first phase resonance tank and the second phase resonance tank work, and the third phase resonance tank does not work, so that a half-bridge LLC resonance converter topology II with two input ends connected in parallel and an output end connected in series is formed; under the topology, the input voltages of the A, B end at the two ends of the first phase resonant tank and the B, C end at the two ends of the second phase resonant tank are both 0-V in The first phase resonant tank and the second phase resonant tank work in a half-bridge LLC resonant converter mode, and two transformers T 1 And T 2 Energy is transmitted to the load side and flows through the two-phase resonant inductor L r1 、L r2 The currents are equal in magnitude and same in phase; the voltage gain of the LLC resonant converter topology two is the sum of the voltage gains of the first resonant tank and the second resonant tank which work in a half-bridge mode; the fundamental wave equivalent circuit model of the LLC resonant converter topology two comprises: fundamental wave equivalent voltage source V AB And V BC Resonant capacitor C r1 And C r2 Resonant inductor L r1 And L r2 And an excitation inductor L m1 And L m2 Fundamental wave equivalent load resistance R eq The fundamental wave equivalent voltage source V AB And a resonance capacitor C r1 Resonant inductor L r1 And an excitation inductor L m1 Connected in series to form a loop, the fundamental equivalent voltage source V BC And a resonance capacitor C r2 Resonant inductor L r2 And an excitation inductor L m2 Are connected in series to form a loop, the excitation inductor L m1 Is connected with an excitation inductor L m2 Said excitation inductance L m1 Head end and excitation inductance L m2 Are respectively connected with the fundamental wave equivalent load resistance R eq Both ends of (a); by a diode D 8 ～D 11 First H-bridge rectifier formed and diode D 12 ～D 15 The second H-bridge rectifier is formed to perform rectification.
Based on three-phase LLC resonant converter with super wide voltage regulating range, its characterized in that: holding switch tube Q 4 Continuously conducting, switching tube Q 2 And Q 5 Continuously cut off, switch tube Q 1 And Q 6 Are the same, turn off Q 3 And Q 7 Is the same as the driving signal of the switching tube Q 1 And Q 6 Complementary, i.e. diagonal drive; the first phase and the second phase resonance groove are connected in series, and the input voltage of the two ends A, C of the first phase and the second phase resonance groove after being connected in series is-V in ～V in Working in a full-bridge LLC resonant converter mode, and the input voltage of the two ends C, D of the third phase resonant tank is 0-V in The square wave works in a half-bridge LLC resonant converter mode, and the LLC resonant converter working in the full-bridge mode and the LLC resonant converter working in the half-bridge mode are connected with the input end in parallel and the output end in series to form an LLC resonant converter topology III; the voltage gain of the LLC resonant converter topology III is the sum of the voltage gain of the first phase resonant tank and the second phase resonant tank which are connected in series under the full-bridge mode and the voltage gain of the third phase resonant tank under the half-bridge mode; current through resonant inductor L r1 And L r2 Current flowing through the resonant inductor L r3 The current is equal in magnitude and 180 degrees in phase difference; the fundamental wave equivalent circuit model of the LLC resonant converter topology III comprises: fundamental wave equivalent voltage source V AC Resonant capacitor C r1 And C r2 Series resonant capacitor C r1 ' resonant inductor L r1 And L r2 Series resonant inductor L r1 ' excitation inductance L m1 And L m2 Series excitation inductance L m1 ', fundamental wave equivalent voltage source V CD Resonant capacitor C r3 Resonant inductor L r3 And an excitation inductor L m3 Fundamental wave equivalent load resistance R eq The fundamental wave equivalent voltage source V AC And a resonant capacitor C r1 ' resonant inductor L r1 ', excitation inductance L m1 ' series, the fundamental equivalent voltage source V CD And a resonant capacitor C r3 Resonant inductor L r3 And an excitation inductor L m3 In series, said excitation inductance L m1 The tail end of the' is connected with an excitation inductor L m3 Said excitation inductance L m1 ' head end and excitation inductance L m3 The tail ends of the first and second electrodes are respectively connected with the fundamental wave equivalent negative electrodeLoad resistor R eq Both ends of (a); transformer T 1 、T 2 、T 3 The three secondary windings are respectively connected with the corresponding H-bridge rectifying circuits to play a role in rectification.
Based on three-phase LLC resonant converter with super wide voltage regulating range, its characterized in that: switch tube Q 7 Continuously conducting, switching tube Q 1 And Q 4 、Q 2 And Q 5 、Q 3 And Q 6 The three bridge arms form a three-phase bridge type inverter circuit, the driving signals of each bridge arm are complementary and have dead zones, and the driving signals among the three bridge arms have a phase difference of 120 degrees; three-phase resonance tank and three transformers T 1 、T 2 、T 3 The primary winding adopts a triangular connection mode, and the input voltages of the three resonance grooves are all-V in ～V in The three-level square wave works in a three-phase full-bridge LLC resonant converter mode to form an LLC resonant converter topology IV; the voltage gain of the LLC resonant converter topology four is the sum of the voltage gains of the first phase resonant tank, the second phase resonant tank and the third phase resonant tank working in a full-bridge mode; current through three-phase resonant inductor L r1 、L r2 、L r3 The current amplitudes are equal, and the phases are different by 120 degrees; the fundamental wave equivalent circuit model of the LLC resonant converter topology four comprises: fundamental wave equivalent voltage source V AB 、V BC 、V CD Resonant capacitor C r1 、C r2 、C r3 Resonant inductor L r1 、L r2 、L r3 And an excitation inductor L m1 、L m2 、L m3 Fundamental wave equivalent load resistance R eq The fundamental wave equivalent voltage source V AB And a resonance capacitor C r1 Resonant inductor L r1 Excitation inductance L m1 In series, the fundamental equivalent voltage source V BC And a resonance capacitor C r2 Resonant inductor L r2 And an excitation inductor L m2 In series, the fundamental equivalent voltage source V CD And a resonance capacitor C r3 Resonant inductor L r3 And an excitation inductor L m3 In series, said excitation inductance L m1 Is connected with an excitation inductor L m2 Said excitation inductance L m2 Is connected to the tail endExcitation inductance L m3 Said excitation inductance L m1 Head end and excitation inductance L m3 Are respectively connected with the fundamental wave equivalent load resistance R eq Both ends of (a); transformer T 1 、T 2 、T 3 The three secondary windings are respectively connected with the corresponding H-bridge rectifying circuits.
The voltage gain ranges of the LLC resonant converter topologies I, II, III and IV are different, and the three-phase LLC resonant converter with the ultra-wide voltage regulation range is switched among the four LLC resonant converter topologies, so that the load requirements of high power and the ultra-wide voltage regulation range are met.
The beneficial effect of this patent lies in: the patent provides a three-phase LLC resonant converter with super wide voltage regulation scope, according to the size of required voltage gain, to power switch tube Q 1 ～Q 7 And performing on-off control to enable the three-phase fully-controlled bridge type inverter circuit to work in four circuit topologies, combining with frequency conversion control, and meeting the requirement on the ultra-wide voltage gain range of the three-phase LLC resonant converter in a narrow frequency range to realize the output voltage of the ultra-wide range of the three-phase LLC resonant converter. Meanwhile, by switching the four topologies, the converter works in a narrow frequency range, which is beneficial to the design of the resonant inductor and the resonant transformer; the technology is applied to a high-power switching power supply, has the advantages of ultra-wide input voltage and output voltage regulation range, low loss, high efficiency and the like, and can avoid the defects of local overheating of a switching tube or a rectifier diode or overhigh voltage and current stress of a device and the like. The achievement of this patent can be widely used in occasions that need high-power more than 10kW, 80-500V or 200 and 1000V super wide output voltage range such as electric automobile charging pile.
The following embodiments are described in detail with reference to the accompanying drawings.
Drawings
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 three-phase LLC resonant converter with an ultra-wide voltage regulation range according to an embodiment of the present invention.
Fig. 2 is a circuit topology diagram of a first LLC resonant converter topology with an ultra-wide voltage regulation range provided by the second embodiment of this patent in fig. 1.
Fig. 3 is a voltage and current waveform diagram of the second embodiment of the present patent of fig. 2.
Fig. 4 is a schematic diagram of a fundamental wave equivalent circuit model of the second embodiment of the present patent of fig. 2.
Fig. 5 is a circuit topology diagram of a second LLC resonant converter topology with an ultra-wide voltage regulation range provided in the third embodiment of this patent of fig. 1.
Fig. 6 is a voltage and current waveform diagram of the third embodiment of this patent of fig. 5.
Fig. 7 is a diagram of a fundamental equivalent circuit model of the third embodiment of this patent of fig. 5.
Fig. 8 is a circuit topology diagram of a LLC resonant converter topology three with an ultra-wide voltage regulation range provided by the fourth embodiment of this patent of fig. 1.
Fig. 9 is a graph of voltage and current waveforms for example four of the patent of fig. 8.
Fig. 10 is a schematic diagram of an equivalent circuit model of the fundamental wave in the fourth embodiment of the present patent application of fig. 8.
Fig. 11 is a circuit topology diagram of a LLC resonant converter topology four with an ultra-wide voltage regulation range provided in the fifth embodiment of this patent of fig. 1.
Fig. 12 is a graph of voltage and current waveforms for example five of the present patent of fig. 11.
Fig. 13 is a diagram of a fundamental wave equivalent circuit model of the fifth embodiment of this patent of fig. 11.
Fig. 14 is a voltage gain curve of LLC resonant converter topologies one, two, three, four of the second, three, five of the embodiments of this patent of fig. 2, 5, 8, 11.
In the figure, V in -a direct current input voltage, V o -a dc output voltage; g ═ V o /V in -a voltage gain; f. of s -a switching frequency; f. of r -a resonance frequency; f. of n ＝f s /f r -normalizing the switching frequency; q 1 ～Q 7 -a power switch tube; d 1 ～D 7 -power switch tube Q 1 ～Q 7 The body diode of (1); c 1 ～C 7 -power switch tube Q 1 ～Q 7 The parasitic capacitance of (2); l is r1 、L r2 、L r3 -a three-phase resonant inductance; c r1 、C r2 、C r3 -a three-phase resonant capacitance; t is 1 、T 2 、T 3 -a three-phase resonant transformer with n turns ratios; l is m1 、L m2 、L m3 -parallel connection to a three-phase resonant transformer T 1 、T 2 、T 3 The equivalent excitation inductance at the two ends of the primary winding; d 8 ～D 19 -twelve rectifier diodes; c o -an output filter capacitance; v gs -power switch tube Q 1 ～Q 7 The driving voltage amplitude of (d); i.e. i r1 、i r2 、i r3 Flowing through a three-phase resonant inductor L r1 、L r2 、L r3 And a three-phase resonance capacitor C r1 、C r2 、C r3 The three-phase resonance current of (2); v gs1 、V gs6 、V gs7 -power switch tube Q 1 、Q 6 、Q 7 The driving voltage of (2); v AB -A, B voltage between the two points; v AC -A, C voltage between the two points; v BC -B, C voltage between the two points; v CD -C, D voltage between the two points; r L -a dc load resistance; r eq -an equivalent ac load resistance.
Detailed Description
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 idea and embodiments of this patent, those skilled in the art can obtain other embodiments without creative efforts, which all belong to the protection scope of this 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 three-phase LLC resonant converter with ultra-wide voltage regulation range is characterized in that: comprising a DC input voltage V in Seven power switch tubes Q 1 ～Q 7 And its body diode D 1 ～D 7 And parasitic capacitance C 1 ～C 7 Three resonant inductors L r1 、L r2 、L r3 Three resonant capacitors C r1 、C r2 、C r3 Resonant transformer T with three turn ratios of n 1 、T 2 、T 3 And connected in parallel to the resonance transformer T, respectively 1 、T 2 、T 3 Equivalent excitation inductance L at two ends of primary winding m1 、L m2 、L m3 Twelve rectifier diodes D 8 ～D 19 And an output filter capacitor C o (ii) a The seven power switch tubes Q 1 ～Q 7 The three-phase full-control bridge type inverter circuit forming the three-phase LLC resonant converter takes the power switch tubes as power MOSFETs (metal-oxide-semiconductor field effect transistors) as an example, and the power switch tube Q 1 Source and Q of 7 Drain electrode connection of, Q 7 Source and Q of 4 The drain electrodes of the three-phase fully-controlled bridge type inverter circuit are connected to form a first bridge arm of the three-phase fully-controlled bridge type inverter circuit; power switch tube Q 2 Source and Q of 5 The drain electrodes of the three-phase fully-controlled bridge type inverter circuit are connected to form a second bridge arm of the three-phase fully-controlled bridge type inverter circuit; power switch tube Q 3 Source and Q of 6 The drain electrodes of the three-phase full-control bridge type inverter circuit are connected to form a third bridge arm of the three-phase full-control bridge type inverter circuit respectively; the three bridge arms are connected in parallel, namely, the power switch tube Q is connected 1 、Q 2 、Q 3 Are connected together to connect the power switch tube Q 4 、Q 5 、Q 6 Are all connected together; the DC input voltage V in Positive pole of the power switch tube Q 1 、Q 2 、Q 3 The direct current input voltage V in Negative pole of the power switch tube Q 4 、Q 5 、Q 6 A source electrode of (a); the resonant capacitor C r1 Resonant inductor L r1 And an excitation inductance L m1 A first phase resonant tank connected in series to form the three-phase LLC resonant converter, and a resonant capacitor C r2 Resonant inductor L r2 And an excitation inductance L m2 A second phase resonant tank connected in series to form the three-phase LLC resonant converter, and a resonant capacitor C r3 Resonant inductor L r3 And an excitation inductance L m3 A third phase resonant tank connected in series to form the three-phase LLC resonant converter; the parameters of the three-phase resonant tank being equal, i.e. L m1 ＝L m2 ＝L m3 ，L r1 ＝L r2 ＝L r3 ，C r1 ＝C r2 ＝C r3 (ii) a The three-phase resonant tank and three resonant transformers T 1 、T 2 、T 3 The three primary windings are connected in a triangular mode, namely one end of a first phase resonance groove is connected with the Q of a first bridge arm 1 Source and Q of 7 The other end of the first resonant slot is connected with the Q of the second bridge arm 2 Source and Q of 5 Connection point B of the drain electrode of (1); one end of the second-phase resonance groove is connected with the other end B of the first-phase resonance groove, and the other end of the second-phase resonance groove is connected with the Q of the third bridge arm 3 Source and Q of 5 Connection point C of the drain of (1); one end of the third phase resonance groove is connected with the other end C of the second phase resonance groove, and the other end of the third phase resonance groove is connected with the Q of the first bridge arm 7 Source and Q of 4 A connection point D of the drain electrode of (1); the three resonance transformers T 1 、T 2 、T 3 Three secondary windings are respectively connected with a rectifier diode D 8 ～D 19 Three H-bridge rectifiers formed, connected in series and then connected with an output filter capacitor C o Parallel output filter capacitor C o Is connected with a load resistor R L 。
Example two:
referring to fig. 2, 3, 4, and 14, a three-phase LLC resonant converter with ultra-wide voltage regulation range is characterized in that: holding switch tube Q 6 Continuously conducting, switching tube Q 1 、Q 3 、Q 4 、Q 7 Continuously cut off, switch tube Q 2 And Q 5 Complementary conduction and working in frequency modulation state, switch tube Q 2 、Q 5 The driving signal of the switch has dead time, which not only prevents the direct connection phenomenon, but also can realize soft switching; transformer T 1 And T 3 Non-operating, transformer T 2 Working with the other end C of the primary winding directly connected to a DC input voltage V in The three-phase resonance tank only works as a second-phase resonance tank, and the input voltage at the ends B, C at the two ends of the second-phase resonance tank is 0-V in The square wave of the LLC resonant converter forms a single-phase half-bridge LLC resonant converter topology I, and the voltage gain of the LLC resonant converter topology I is the voltage gain of the LLC resonant converter working in a half-bridge mode; the fundamental wave equivalent circuit model of the LLC resonant converter topology I comprises: fundamental wave equivalent voltage source V BC Resonant capacitor C r2 Resonant inductor L r2 And an excitation inductor L m2 Fundamental wave equivalent load resistance R eq The fundamental wave equivalent voltage source V BC Resonant capacitor C r2 Resonant inductor L r2 And an excitation inductance L m2 In series, the fundamental equivalent load resistance R eq Is connected to the excitation inductor L m2 Both ends of (a); the three H-bridge rectifiers are connected in series by a diode D 12 ～D 15 The second H-bridge rectifier is formed to perform rectification.
The working waveform of the LLC resonant converter topology I refers to the attached figure 3, wherein V gs Is a switching tube Q 2 、Q 5 、Q 6 Driving voltage of V BC Is a voltage between B, C, i.e. the input voltage of the second resonator, i Lr2 、i Lm2 Resonant current and excitation current, i, of the second resonant cavity, respectively d For rectifying the current of the diode, i o Is the output current of the converter. Switch tube Q 2 And Q 5 Complementary conduction with a certain dead time, and input voltage V of the second resonant cavity BC Is 0 to V in Square wave of (a). The operation of the converter can be divided into eight phases: t is t 0 ～t 1 、t 1 ～t 2 、t 2 ～t 3 、t 3 ～t 4 、t 4 ～t 5 、t 5 ～t 6 、t 6 ～t 7 、t 7 ～t 8 Since its operation principle is similar to that of a conventional half bridge LLC resonant converter, it is not explained in detail here, but the operation of the first four stages of the converter is given, with reference to fig. 4, 5, 6 and 7.
The voltage gain curve of the LLC resonant converter topology one described in this embodiment is shown in fig. 14.
Example three:
referring to fig. 5, 6, 7 and 14, a three-phase LLC resonant converter with ultra-wide voltage regulation range is characterized in that: holding switch tube Q 1 、Q 6 Continuously conducting, switching tube Q 3 、Q 4 、Q 7 Continuously cut off, switch tube Q 2 、Q 5 Complementary conduction and working in frequency modulation state, switching tube Q 2 、Q 5 The driving signal of the switch has dead time, which not only prevents the direct connection phenomenon, but also can realize soft switching; the A end of the first phase resonance groove is directly connected with a direct current input voltage V in The C end of the third phase resonant tank is directly connected with a direct current input voltage V in The first phase resonance tank and the second phase resonance tank work, and the third phase resonance tank does not work, so that a half-bridge LLC resonance converter topology II with two input ends connected in parallel and an output end connected in series is formed; under the topology, the input voltages of the A, B end at the two ends of the first phase resonant tank and the B, C end at the two ends of the second phase resonant tank are both 0-V in The first phase resonant tank and the second phase resonant tank work in a half-bridge LLC resonant converter mode, and two transformers T 1 And T 2 Energy is transmitted to the load side and flows through the two-phase resonant inductor L r1 、L r2 The currents are equal in magnitude and the phases are the same; the voltage gain of the LLC resonant converter topology two is the sum of the voltage gains of the first resonant tank and the second resonant tank which work in a half-bridge mode; the fundamental wave equivalent circuit model of the LLC resonant converter topology two comprises: fundamental wave equivalent voltage source V AB And V BC Resonant capacitor C r1 And C r2 Resonant vibrationInductor L r1 And L r2 And an excitation inductor L m1 And L m2 Fundamental wave equivalent load resistance R eq The fundamental wave equivalent voltage source V AB And a resonance capacitor C r1 Resonant inductor L r1 And an excitation inductor L m1 Are connected in series to form a loop, the fundamental wave equivalent voltage source V BC And a resonance capacitor C r2 Resonant inductor L r2 And an excitation inductor L m2 Are connected in series to form a loop, the excitation inductor L m1 Is connected with an excitation inductor L m2 Said excitation inductance L m1 Head end and excitation inductance L m2 Are respectively connected with the fundamental wave equivalent load resistance R eq Both ends of (a); from diode D 8 ～D 11 First H-bridge rectifier formed and diode D 12 ～D 15 The second H-bridge rectifier is formed to perform rectification. The voltage gain curve of the LLC resonant converter topology two described in this embodiment is shown in fig. 14.
Example four:
referring to fig. 8, 9, 10, and 14, a three-phase LLC resonant converter with ultra-wide voltage regulation range is characterized in that: holding switch tube Q 4 Continuously conducting, switching tube Q 2 And Q 5 Continuously cut off, switch tube Q 1 And Q 6 Are the same, turn off Q 3 And Q 7 Is the same as the driving signal of the switching tube Q 1 And Q 6 Complementary, i.e. diagonal drive; the first phase resonance groove and the second phase resonance groove are connected in series, and the input voltage of A, C ends of the first phase resonance groove and the second phase resonance groove after being connected in series is-V in ～V in The square wave of (3) works in a full-bridge LLC resonant converter mode, and the input voltage of the C, D ends of the two ends of the third phase resonant tank is 0-V in The square wave works in a half-bridge LLC resonant converter mode, and the LLC resonant converter working in the full-bridge mode and the LLC resonant converter working in the half-bridge mode are connected with the input end in parallel and the output end in series to form an LLC resonant converter topology III; the voltage gain of the LLC resonant converter topology III is the electricity formed by connecting the first resonant tank and the second resonant tank in series under the full-bridge modeThe sum of the voltage gain and the voltage gain of a third phase resonant tank operating in half-bridge mode; current through resonant inductor L r1 And L r2 Current flowing through the resonant inductor L r3 The current is equal in magnitude and 180 degrees in phase difference; the fundamental wave equivalent circuit model of the LLC resonant converter topology III comprises: fundamental wave equivalent voltage source V AC Resonant capacitor C r1 And C r2 Resonant inductor L r1 And L r2 And an excitation inductor L m1 And L m2 Fundamental wave equivalent voltage source V CD Resonant capacitor C r3 Resonant inductor L r3 Excitation inductance L m3 Fundamental wave equivalent load resistance R eq The fundamental wave equivalent voltage source V AC And a resonance capacitor C r1 Resonant inductor L r1 In series, said excitation inductance L m1 And a resonance capacitor C r2 Resonant inductor L r2 And an excitation inductor L m2 In series, the fundamental equivalent voltage source V CD And a resonance capacitor C r3 Resonant inductor L r3 In series, said excitation inductance L m1 The head end of the inductor is connected with a resonance inductor L r1 Said excitation inductance L m2 Is connected with a fundamental wave equivalent voltage source V AC Said excitation inductance L m3 Are respectively connected with a resonance inductor L r3 And connected with a fundamental wave equivalent voltage source V CD The tail end of the fundamental wave equivalent load resistance R eq Are respectively connected with a resonance inductor L r1 Tail end of and fundamental wave equivalent voltage source V CD The tail end of (a); transformer T 1 、T 2 、T 3 The three secondary windings are respectively connected with the corresponding H-bridge rectifying circuits to play a role in rectification. The voltage gain curve of the LLC resonant converter topology three described in this embodiment is shown in fig. 14.
Example five:
referring to fig. 11, 12, 13, and 14, a three-phase LLC resonant converter with ultra-wide voltage regulation range is characterized in that: switch tube Q 7 Continuously conducting, switching tube Q 1 And Q 4 、Q 2 And Q 5 、Q 3 And Q 6 Three bridge arms form a three-phase bridge type inverter circuit, and each bridge arm is provided with three bridge armsThe driving signals of the bridge arms are complementary and provided with dead zones, and the driving signals of the three bridge arms have a phase difference of 120 degrees; three-phase resonance tank and three transformers T 1 、T 2 、T 3 The primary winding adopts a triangular connection mode, and the input voltages of the three resonance grooves are all-V in ～V in The three-level square wave works in a three-phase full-bridge LLC resonant converter mode to form an LLC resonant converter topology IV; the voltage gain of the LLC resonant converter topology four is the sum of the voltage gains of the first phase resonant tank, the second phase resonant tank and the third phase resonant tank working in a full-bridge mode; current through three-phase resonant inductor L r1 、L r2 、L r3 The current amplitudes are equal, and the phases are different by 120 degrees; the fundamental wave equivalent circuit model of the LLC resonant converter topology four comprises: fundamental wave equivalent voltage source V AB 、V BC 、V CD Resonant capacitor C r1 、C r2 、C r3 Resonant inductor L r1 、L r2 、L r3 And an excitation inductor L m1 、L m2 、L m3 Fundamental wave equivalent load resistance R eq The fundamental wave equivalent voltage source V AB And a resonance capacitor C r1 Resonant inductor L r1 And an excitation inductor L m1 In series, the fundamental equivalent voltage source V BC And a resonance capacitor C r2 Resonant inductor L r2 Excitation inductance L m2 In series, the fundamental equivalent voltage source V CD And a resonant capacitor C r3 Resonant inductor L r3 And an excitation inductor L m3 In series, said excitation inductance L m1 Is connected with an excitation inductor L m2 Said excitation inductance L m2 Is connected with an excitation inductor L m3 Said excitation inductance L m1 Head end and excitation inductance L m3 Are respectively connected with the fundamental wave equivalent load resistance R eq Both ends of (a); transformer T 1 、T 2 、T 3 The three secondary windings are respectively connected with the corresponding H-bridge rectifying circuits. The voltage gain curve of the LLC resonant converter topology four described in this embodiment is shown in fig. 14.
Example six:
referring to fig. 14, voltage gain ranges of the first, second, third, and fourth LLC resonant converters in the second, third, fourth, and fifth embodiments are different, and the three-phase LLC resonant converter with an ultra-wide voltage regulation range in the first embodiment switches among the first, second, third, fourth, and fifth topologies of the three-phase LLC resonant converter, so as to meet load requirements of high power and ultra-wide voltage regulation range.
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 (5)

1. The utility model provides a three-phase LLC resonant converter with super wide voltage regulating range which characterized in that: comprising a DC input voltage V in Seven power switch tubes Q 1 ～Q 7 And its body diode D 1 ～D 7 And parasitic capacitance C 1 ～C 7 Three resonant inductances L r1 、L r2 、L r3 Three resonant capacitors C r1 、C r2 、C r3 Resonant transformer T with three turn ratios of n 1 、T 2 、T 3 And connected in parallel to the resonance transformer T, respectively 1 、T 2 、T 3 Equivalent excitation inductance L at two ends of primary winding m1 、L m2 、L m3 Twelve rectifier diodes D 8 ～D 19 And an output filter capacitor C o ；
The seven power switch tubes Q 1 ～Q 7 A three-phase full-control bridge type inverter circuit for forming the three-phase LLC resonant converter and the powerSwitch tube Q 1 ～Q 7 All power MOSFETs as examples, power switch Q 1 Source and Q of 7 Drain electrode connection of (2), Q 7 Source and Q of 4 The drain electrodes of the three-phase fully-controlled bridge type inverter circuit are connected to form a first bridge arm of the three-phase fully-controlled bridge type inverter circuit; power switch tube Q 2 Source and Q of 5 The drain electrodes of the three-phase fully-controlled bridge type inverter circuit are connected to form a second bridge arm of the three-phase fully-controlled bridge type inverter circuit; power switch tube Q 3 Source and Q of 6 The drain electrodes of the three-phase fully-controlled bridge type inverter circuit are connected to form a third bridge arm of the three-phase fully-controlled bridge type inverter circuit respectively; the three bridge arms are connected in parallel, namely, the power switch tube Q is connected 1 、Q 2 、Q 3 Are connected together to connect the power switch tube Q 4 、Q 5 、Q 6 Are all connected together; the DC input voltage V in Positive pole of the power switch tube Q 1 、Q 2 、Q 3 The direct current input voltage V in Negative pole of the power switch tube Q 4 、Q 5 、Q 6 A source electrode of (a);
the resonant capacitor C r1 Resonant inductor L r1 And an excitation inductance L m1 A first phase resonant tank connected in series to form the three-phase LLC resonant converter, and a resonant capacitor C r2 Resonant inductor L r2 And an excitation inductance L m2 A second phase resonant tank connected in series to form the three-phase LLC resonant converter, and a resonant capacitor C r3 Resonant inductor L r3 And an excitation inductance L m3 A third phase resonant tank of the three-phase LLC resonant converter is formed by connecting in series; the parameters of the three-phase resonance tank are equal, namely L m1 ＝L m2 ＝L m3 ，L r1 ＝L r2 ＝L r3 ，C r1 ＝C r2 ＝C r3 ；
The three-phase resonance tank and three resonance transformers T 1 、T 2 、T 3 The three primary windings are connected in a triangular mode, namely one end of a first phase resonance groove is connected with the Q of a first bridge arm 1 Source and Q of 7 The other end of the first resonant slot is connected with the Q of the second bridge arm 2 Source and Q of 5 Connection point B of the drain electrode of (1); one end of the second-phase resonance groove is connected with the other end B of the first-phase resonance groove, and the other end of the second-phase resonance groove is connected with the Q of the third bridge arm 3 Source and Q of 5 Connection point C of the drain of (1); one end of the third phase resonance groove is connected with the other end C of the second phase resonance groove, and the other end of the third phase resonance groove is connected with the Q of the first bridge arm 7 Source and Q of 4 A connection point D of the drain electrode of (1);
the three resonance transformers T 1 、T 2 、T 3 Three secondary windings are respectively connected with a rectifier diode D 8 ～D 19 Three H-bridge rectifiers formed, connected in series and then connected with an output filter capacitor C o Parallel output filter capacitor C o Is connected with a load resistor R at two ends L 。
2. A three-phase LLC resonant converter with an ultra-wide voltage regulation range, as recited in claim 1, wherein: holding switch tube Q 6 Continuously conducting, switching tube Q 1 、Q 3 、Q 4 、Q 7 Continuously cut off, switch tube Q 2 And Q 5 Complementary conduction and working in frequency modulation state, switching tube Q 2 、Q 5 The driving signal of the switch has dead time, which not only prevents the direct connection phenomenon, but also can realize soft switching;
transformer T 1 And T 3 Non-operating, transformer T 2 Working with the other end C of the primary winding directly connected to a DC input voltage V in The three-phase resonance tank only works as a second-phase resonance tank, and the input voltage at the ends B, C at the two ends of the second-phase resonance tank is 0-V in The square wave of (2) forms a single-phase half-bridge LLC resonant converter topology I; the voltage gain of the LLC resonant converter topology I is the voltage gain of the LLC resonant converter operating in a half-bridge mode;
the fundamental wave equivalent circuit model of the LLC resonant converter topology I comprises: fundamental wave equivalent voltage source V BC Resonant capacitor C r2 Resonant inductor L r2 And an excitation inductor L m2 Fundamental wave equivalent load resistance R eq The fundamental wave equivalent voltage source V BC Resonant capacitor C r2 Resonant inductor L r2 And an excitation inductance L m2 In series, the fundamental equivalent load resistance R eq Connected to an excitation inductor L m2 Both ends of (a);
the three H-bridge rectifiers are connected in series, with a diode D 12 ～D 15 The second H-bridge rectifier is formed to perform rectification.
3. A three-phase LLC resonant converter with an ultra-wide voltage regulation range, as recited in claim 1, wherein: holding switch tube Q 1 、Q 6 Continuously conducting, switching tube Q 3 、Q 4 、Q 7 Continuously cut off, switch tube Q 2 、Q 5 Complementary conduction and working in frequency modulation state, switching tube Q 2 、Q 5 The driving signal of the switch has dead time, which not only prevents the direct connection phenomenon, but also can realize soft switching;
the A end of the first phase resonance groove is directly connected with a direct current input voltage V in The C end of the third phase resonant tank is directly connected with a direct current input voltage V in The first phase resonance tank and the second phase resonance tank work, and the third phase resonance tank does not work, so that a half-bridge LLC resonance converter topology two with parallel two-phase input ends and series output ends is formed; under the topology, the input voltages of the A, B ends at the two ends of the first phase resonant tank and the B, C ends at the two ends of the second phase resonant tank are both 0-V in The first phase resonance groove and the second phase resonance groove work in a half-bridge LLC resonance converter mode, and the two transformers T 1 And T 2 Energy is transmitted to the load side and flows through the two-phase resonant inductor L r1 、L r2 The currents are equal in magnitude and same in phase;
the voltage gain of the LLC resonant converter topology two is the sum of the voltage gain of the first phase resonant tank and the voltage gain of the second phase resonant tank which work in a half-bridge mode;
the fundamental wave equivalent circuit model of the LLC resonant converter topology two comprises: fundamental wave equivalent voltage source V AB And V BC Resonant capacitor C r1 And C r2 Resonant inductor L r1 And L r2 And an excitation inductor L m1 And L m2 Fundamental wave equivalent load resistance R eq The fundamental wave equivalent voltage source V AB And a resonance capacitor C r1 Resonant inductor L r1 And an excitation inductor L m1 Are connected in series to form a loop, the fundamental wave equivalent voltage source V BC And a resonant capacitor C r2 Resonant inductor L r2 And an excitation inductor L m2 Are connected in series to form a loop, the excitation inductor L m1 Is connected with an excitation inductor L m2 Said excitation inductance L m1 Head end and excitation inductance L m2 Respectively connected with the fundamental wave equivalent load resistance R eq Both ends of (a);
by a diode D 8 ～D 11 First H-bridge rectifier formed and diode D 12 ～D 15 The second H-bridge rectifier is formed to perform rectification.
4. A three-phase LLC resonant converter with an ultra-wide voltage regulation range, as recited in claim 1, wherein: holding switch tube Q 4 Continuously conducting, switching tube Q 2 And Q 5 Continuously cut off, switch tube Q 1 And Q 6 Are the same, turn off Q 3 And Q 7 Is the same as the driving signal of the switching tube Q 1 And Q 6 Complementary, i.e. diagonal drive;
the first phase resonance groove and the second phase resonance groove are connected in series, and after the first phase resonance groove and the second phase resonance groove are connected in series, the input voltage of the two ends A, C is-V in ～V in Working in a full-bridge LLC resonant converter mode, and the input voltage of the two ends C, D of the third phase resonant tank is 0-V in The square wave of (3) works in a half-bridge LLC resonant converter mode, and the LLC resonant converter working in the full-bridge mode and the LLC resonant converter working in the half-bridge mode are connected in parallel at the input end and in series at the output end to form an LLC resonant converter topology III;
the voltage gain of the LLC resonant converter topology III is the sum of the voltage gain of the first phase resonant tank and the second phase resonant tank which work in a full-bridge mode in series and the voltage gain of the third phase resonant tank which work in a half-bridge mode;
current through resonant inductor L r1 And L r2 Current flowing through the resonant inductor L r3 The current of the two-phase current is equal in magnitude and 180 degrees in phase difference;
the fundamental wave equivalent circuit model of the LLC resonant converter topology III comprises: fundamental wave equivalent voltage source V AC Resonant capacitor C r1 And C r2 Resonant inductor L r1 And L r2 And an excitation inductor L m1 And L m2 Fundamental wave equivalent voltage source V CD Resonant capacitor C r3 Resonant inductor L r3 And an excitation inductor L m3 Fundamental wave equivalent load resistance R eq The fundamental wave equivalent voltage source V AC And a resonance capacitor C r1 Resonant inductor L r1 In series, the excitation inductance L m1 And a resonance capacitor C r2 Resonant inductor L r2 And an excitation inductor L m2 In series, the fundamental equivalent voltage source V CD And a resonance capacitor C r3 Resonant inductor L r3 In series, said excitation inductance L m1 The head end of the inductor is connected with a resonance inductor L r1 Said excitation inductance L m2 Is connected with a fundamental wave equivalent voltage source V AC Said excitation inductance L m3 Are respectively connected with a resonance inductor L r3 And connected with a fundamental wave equivalent voltage source V CD The tail end of the fundamental wave equivalent load resistance R eq Are respectively connected with a resonance inductor L r1 Tail end of and fundamental wave equivalent voltage source V CD The tail end of (a);
transformer T 1 、T 2 、T 3 The three secondary windings are respectively connected with the corresponding H-bridge rectifying circuits to play a role in rectification.
5. A three-phase LLC resonant converter with an ultra-wide voltage regulation range, as recited in claim 1, wherein: switch tube Q 7 Continuously conducting, switching tube Q 1 And Q 4 、Q 2 And Q 5 、Q 3 And Q 6 The three bridge arms form a three-phase bridge type inverter circuit, the driving signals of each bridge arm are complementary and have dead zones, and the driving signals among the three bridge arms have a phase difference of 120 degrees;
three-phase resonance tank and three transformers T 1 、T 2 、T 3 The primary winding adopts a triangular connection mode, and the input voltages of the three resonance grooves are all-V in ～V in The three-level square wave works in a three-phase full-bridge LLC resonant converter mode to form an LLC resonant converter topology IV; the voltage gain of the LLC resonant converter topology four is the sum of the voltage gains of the first phase resonant tank, the second phase resonant tank and the third phase resonant tank working in a full-bridge mode;
current through three-phase resonant inductor L r1 、L r2 、L r3 The current amplitudes are equal, and the phases are different by 120 degrees;
the fundamental wave equivalent circuit model of the LLC resonant converter topology four comprises: fundamental wave equivalent voltage source V AB 、V BC 、V CD Resonant capacitor C r1 、C r2 、C r3 Resonant inductor L r1 、L r2 、L r3 And an excitation inductor L m1 、L m2 、L m3 Fundamental wave equivalent load resistance R eq The fundamental wave equivalent voltage source V AB And a resonance capacitor C r1 Resonant inductor L r1 Excitation inductance L m1 In series, the fundamental equivalent voltage source V BC And a resonant capacitor C r2 Resonant inductor L r2 And an excitation inductor L m2 In series, the fundamental equivalent voltage source V CD And a resonance capacitor C r3 Resonant inductor L r3 Excitation inductance L m3 In series, said excitation inductance L m1 Is connected with an excitation inductor L m2 Said excitation inductance L m2 Is connected with an excitation inductor L m3 Said excitation inductance L m1 Head end and excitation inductance L m3 Are respectively connected with the fundamental wave equivalent load resistance R eq Two ends of (a);
transformer T 1 、T 2 、T 3 The three secondary windings are respectively connected with the corresponding H-bridge rectifying circuits.
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