CN218549757U - Three-phase staggered wide-range efficient isolation bidirectional converter - Google Patents
Three-phase staggered wide-range efficient isolation bidirectional converter Download PDFInfo
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- CN218549757U CN218549757U CN202222404466.0U CN202222404466U CN218549757U CN 218549757 U CN218549757 U CN 218549757U CN 202222404466 U CN202222404466 U CN 202222404466U CN 218549757 U CN218549757 U CN 218549757U
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Abstract
The utility model discloses a bidirectional converter is kept apart to crisscross wide region of three-phase high efficiency, including three-phase bridge type switch circuit, resonant cavity, three transformer and three-phase bridge type rectifier circuit, the resonant cavity includes three resonant circuit, and resonant circuit includes first electric capacity, second electric capacity, third electric capacity, first inductance, second inductance and third inductance, the one end of second inductance, first electric capacity and third electric capacity is connected to the one end of first inductance, and the one end of third inductance and second electric capacity is connected respectively to the other end of first inductance and first electric capacity, and the mid point of a bridge arm among the three-phase bridge type switch circuit is connected to this one end of third inductance, and the other end of third inductance and second electric capacity is connected respectively to the other end of second inductance and third electric capacity, and connect the primary winding of a transformer, and the one end that second electric capacity and first electric capacity are connected mutually respectively forms the Y type and is connected, and three transformer secondary connects three bridge arm's three mid point respectively.
Description
Technical Field
The utility model relates to a power conversion technology field, more specifically relate to a two-way converter is kept apart to crisscross wide range high efficiency of three-phase.
Background
The DC-DC bidirectional converter is a DC/DC converter capable of adjusting energy bidirectional transmission according to requirements, is mainly applied to occasions such as an energy storage system, a vehicle-mounted power supply system, a feedback charging and discharging system, a hybrid energy electric vehicle and the like, and with continuous development of the industry, the power is continuously improved from kilowatt level to dozens of kilowatt level, so that the topology of high power, wide range, positive and negative symmetry and bidirectional and high efficiency is realized, and the trend is great.
In the traditional LLC resonant bidirectional converter, ZVS (zero voltage switching) conduction of a switching tube at the primary side and ZCS (zero voltage switching) conduction of a diode at the rectifying side can be realized no matter in forward and reverse work, but when energy flows reversely, the circuit characteristic is not the LLC resonant characteristic any more and is degraded into LC resonant characteristic, the maximum voltage gain of LC resonance is changed into 1, the voltage gain in reverse work is greatly reduced, reverse normal output cannot be realized, and therefore the forward and reverse completely symmetrical bidirectional cannot be realized; in order to realize fully symmetrical bidirectional energy flow, a DAB (digital audio broadcasting) or a one-level topology circuit is added on the basis of an LLC (logical link control), the problem of insufficient LLC reverse gain capacity is solved, fully symmetrical bidirectional is basically realized, however, the DAB hard switch and LLC two-level topology framework bring the problem of low efficiency, particularly for higher-power bidirectional DC-DC, due to the inherent problems of DAB or two-level topology, after the power is continuously increased, the heat and ripple waves of the high-power bidirectional DC-DC are more and more difficult to process, and finally become a bottleneck.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a can reduce the ripple, realize wide range, positive and negative gain symmetry and efficient three-phase crisscross high-efficient isolation bidirectional converter of wide range simultaneously.
In order to solve the above technical problems, the present invention provides a three-phase interleaved wide-range high-efficiency isolated bidirectional converter, comprising a three-phase bridge switching circuit, a resonant cavity, three transformers and a three-phase bridge rectifying circuit, wherein one side of the three-phase bridge switching circuit and one side of the three-phase bridge rectifying circuit are respectively used as a first connecting side and a second connecting side of the three-phase interleaved wide-range high-efficiency isolated bidirectional converter, the resonant cavity comprises three resonant circuits, and the three resonant circuits are respectively correspondingly connected between the middle points of three bridge arms of the three-phase bridge switching circuit and the primary windings of the three transformers,
the resonant circuit comprises a first capacitor, a second capacitor, a third capacitor, a first inductor, a second inductor and a third inductor, one end of the first inductor is connected with one ends of the second inductor, the first capacitor and the third capacitor, the other ends of the first inductor and the first capacitor are respectively connected with one ends of the third inductor and the second capacitor, one end of the third inductor is connected to the midpoint of one bridge arm in the three-phase bridge type switching circuit, the other ends of the second inductor and the third capacitor are respectively connected with the other ends of the third inductor and the second capacitor and are connected with a primary winding of a transformer, the ends of the second capacitor and the first capacitor in the three resonant circuits are respectively connected with each other to form Y-shaped connection, the homonymous ends of the secondary windings of the three transformers are respectively correspondingly connected with the midpoint of the three bridge arms of the three-phase bridge type rectifying circuit, and the synonym ends of the secondary windings of the three transformers are respectively connected with each other to form Y-shaped connection.
The further technical scheme is as follows: the three-phase bridge type switching circuit comprises six switching tubes, every two switching tubes are connected in series to form a bridge arm, and two ends of the three bridge arms are used as the first connecting side of the three-phase staggered wide-range efficient isolation bidirectional converter after the three bridge arms are connected in parallel.
The further technical scheme is as follows: the three-phase bridge rectification circuit comprises six switching tubes, every two switching tubes are connected in series to form a bridge arm, and two ends of the three bridge arms are used as second connection sides of the three-phase staggered wide-range efficient isolation bidirectional converter after the three bridge arms are connected in parallel.
The further technical scheme is as follows: the switch tube is a MOSFET, an IGBT tube, a GaN tube or a SiC power tube.
The further technical scheme is as follows: the three-phase alternating wide-range efficient isolation bidirectional converter further comprises a first filter capacitor and a second filter capacitor, two ends of the first filter capacitor are connected to a first connecting side of the three-phase alternating wide-range efficient isolation bidirectional converter, and two ends of the second filter capacitor are connected to a second connecting side.
In order to solve the above technical problems, the present invention further provides a three-phase interleaved wide-range high-efficiency isolated bidirectional converter, comprising a three-phase bridge switching circuit, a resonant cavity, three transformers and a three-phase bridge rectifying circuit, wherein one side of the three-phase bridge switching circuit and one side of the three-phase bridge rectifying circuit are respectively used as a first connecting side and a second connecting side of the three-phase interleaved wide-range high-efficiency isolated bidirectional converter, the resonant cavity comprises three resonant circuits, and the three resonant circuits are respectively correspondingly connected between the middle points of the three bridge arms of the three-phase bridge switching circuit and the primary windings of the three transformers,
the resonant circuit comprises a first capacitor, a second capacitor, a third capacitor, a first inductor, a second inductor and a third inductor, wherein one end of the first inductor is connected with one ends of the second inductor, the first capacitor and the third capacitor, the other ends of the first inductor and the first capacitor are respectively connected with one ends of the third inductor and the second capacitor, one end of the second capacitor is connected to the middle point of a bridge arm in the three-phase bridge type switching circuit, the other ends of the second inductor and the third capacitor are respectively connected with the other ends of the third inductor and the second capacitor and are connected with a primary winding of a transformer, the ends of the third inductor and the first inductor in the three resonant circuits are respectively connected with each other to form Y-shaped connection, the homonymous ends of secondary windings of the three transformers are respectively correspondingly connected with the middle points of three bridge arms of the three-phase bridge type rectifying circuit, and the heteronymous ends of the secondary windings of the three transformers are respectively connected with each other to form Y-shaped connection.
In order to solve the above technical problems, the present invention further provides a three-phase interleaved wide-range high-efficiency isolating bidirectional converter, comprising a three-phase bridge switching circuit, a resonant cavity, three transformers and a three-phase bridge rectifying circuit, wherein one side of the three-phase bridge switching circuit and one side of the three-phase bridge rectifying circuit are respectively used as a first connecting side and a second connecting side of the three-phase interleaved wide-range high-efficiency isolating bidirectional converter, the resonant cavity comprises three resonant circuits, the three resonant circuits are respectively and correspondingly connected between the middle points of three bridge arms of the three-phase bridge switching circuit and primary windings of the three transformers, wherein,
the resonant circuit comprises a first capacitor, a second capacitor, a first inductor, a second inductor and a third inductor, wherein one end of the first inductor and one end of the second inductor are connected with one end of the first capacitor and one end of the second capacitor, the other end of the first inductor is connected with one end of the third inductor and is connected to the middle point of one bridge arm in the three-phase bridge type switching circuit, the other ends of the second inductor and the second capacitor are connected with a primary winding of a transformer, the other end of the second inductor is connected with the other end of the third inductor, the other ends of the first capacitor in the three resonant circuits are connected with each other to form Y-shaped connection, the dotted ends of secondary windings of the three transformers are correspondingly connected with the middle points of three bridge arms of the three-phase bridge type rectifying circuit respectively, and the dotted ends of secondary windings of the three transformers are connected with each other to form Y-shaped connection.
In order to solve the above technical problems, the present invention further provides a three-phase interleaved wide-range high-efficiency isolating bidirectional converter, comprising a three-phase bridge switching circuit, a resonant cavity, three transformers and a three-phase bridge rectifying circuit, wherein one side of the three-phase bridge switching circuit and one side of the three-phase bridge rectifying circuit are respectively used as a first connecting side and a second connecting side of the three-phase interleaved wide-range high-efficiency isolating bidirectional converter, the resonant cavity comprises three resonant circuits, the three resonant circuits are respectively and correspondingly connected between the middle points of three bridge arms of the three-phase bridge switching circuit and primary windings of the three transformers, wherein,
the resonant circuit comprises a first capacitor, a second capacitor, a first inductor, a second inductor and a third inductor, wherein one end of the first inductor is connected with one ends of the first capacitor and the third inductor, one end of the second inductor is connected with the other end of the third inductor and one end of the second capacitor, the other end of the first capacitor is connected with the midpoint of one bridge arm in the three-phase bridge type switching circuit, the other ends of the second inductor and the second capacitor are connected with a primary winding of a transformer, the other end of the second inductor is connected with the other end of the first inductor, the dotted ends of secondary windings of the three transformers are respectively and correspondingly connected with the midpoint of the three bridge arms of the three-phase bridge type rectifying circuit, and the dotted ends of the primary windings and the secondary windings of the three transformers are respectively connected with each other to form Y-shaped connection.
Compared with the prior art, the utility model discloses each circuit adopts the crisscross technique of three-phase to reduce the ripple among the crisscross wide range high-efficient isolation bidirectional converter of three-phase, and the equivalent circuit of resonant circuit when the energy forward and reverse flows is multi-element resonant circuit, soft switch is realized to the forward and reverse during operation, and the loss is less, has solved the problem that traditional LLC resonant circuit can not reverse equal performance work, namely the utility model discloses the crisscross wide range high-efficient isolation bidirectional converter of three-phase can boost when the energy backward flow, can effectively promote the input output voltage scope of converter, realizes wide voltage range output, and the gain is the same when the energy forward and reverse flows simultaneously, just the utility model discloses resonant circuit's structural design does not need wide band control to realize wide voltage range output when adopting switch frequency modulation control, and switch control frequency narrows down promptly, raises the efficiency.
Drawings
Fig. 1 is a schematic circuit diagram of a first embodiment of a three-phase interleaved wide-range high-efficiency isolated bidirectional converter according to the present invention.
Fig. 2 is a schematic circuit diagram of a second embodiment of the three-phase interleaved wide-range high-efficiency isolated bidirectional converter of the present invention.
Fig. 3 is a schematic circuit diagram of a third embodiment of the three-phase interleaved wide-range high-efficiency isolated bidirectional converter of the present invention.
Fig. 4 is a schematic circuit diagram of a fourth embodiment of the three-phase interleaved wide-range high-efficiency isolated bidirectional converter of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more clearly understood by those skilled in the art, the present invention will be further described with reference to the accompanying drawings and examples.
Referring to fig. 1, fig. 1 is a schematic circuit diagram of a first embodiment of a three-phase interleaved wide-range high-efficiency isolated bidirectional converter 10 according to the present invention. In the embodiment shown in the drawings, the three-phase interleaved wide-range efficient isolation bidirectional converter 10 includes a three-phase bridge switching circuit 100, a resonant cavity 200, three transformers and a three-phase bridge rectifying circuit 300, one side of the three-phase bridge switching circuit 100 and one side of the three-phase bridge rectifying circuit 300 are respectively used as a first connection side and a second connection side of the converter 10 to connect a power supply or a load, the resonant cavity 200 includes three resonant circuits, and the three resonant circuits are respectively and correspondingly connected between the middle points of three bridge arms of the three-phase bridge switching circuit 100 and primary windings of the three transformers. The resonant circuit comprises a first capacitor, a second capacitor, a third capacitor, a first inductor, a second inductor and a third inductor, one end of the first inductor is connected with one end of the second inductor, one end of the first capacitor and one end of the third capacitor, the other ends of the first inductor and the first capacitor are respectively connected with one ends of the third inductor and one end of the second capacitor, one end of the third inductor is connected with the midpoint of one bridge arm in the three-phase bridge type switching circuit 100, the other ends of the second inductor and the third capacitor are respectively connected with the other ends of the third inductor and the second capacitor and are connected with a primary winding of a transformer, the ends of the three resonant circuits, which are connected with the first capacitor, are respectively connected with each other to form a Y-shaped connection, the homonymous ends of the secondary windings of the three transformers are respectively and correspondingly connected with the midpoint of three bridge arms of the three-phase bridge type rectifying circuit 300, and the synonym ends of the secondary windings of the three transformers are respectively connected with each other to form a Y-shaped connection. Preferably, the inductance of the first inductor and the inductance of the second inductor in the resonant circuit are the same, and the capacitance of the first capacitor and the capacitance of the third capacitor are the same. Understandably, the Y-type connection is adopted in the resonant circuits, the total current flowing into the midpoint of the Y-type connection is equal to the total current flowing out of the midpoint of the Y-type connection, namely the sum of the currents of the three resonant circuits is '0', so that the current of one resonant circuit is always the sum of the currents of the other two resonant circuits at any moment, and even if the resonant parameters of each resonant circuit have certain tolerance in the whole switching period, the effective current value deviation of the resonant circuits is small, so that the current balance among the three resonant circuits is ensured, and the phenomenon that the devices of the circuit are damaged or overheated due to the overlarge current of one resonant circuit is avoided.
Specifically, in this embodiment, the resonant cavity 200 includes a first resonant circuit, a second resonant circuit and a third resonant circuit, the three transformers include a first transformer T1, a second transformer T2 and a third transformer T3, the first resonant circuit includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a first inductor L1, a second inductor L2 and a third inductor L3, the second resonant circuit includes a first capacitor C4, a second capacitor C5, a third capacitor C6, a first inductor L4, a second inductor L5 and a third inductor L6, the third resonant circuit includes a first capacitor C7, a second capacitor C8, a third capacitor C9, a first inductor L7, a second inductor L8 and a third inductor L9, in the embodiment shown in the drawings, the third inductor L3, the third inductor L6 and the third inductor L9 are respectively and correspondingly connected to middle points of three bridge arms of the bridge-type switching circuit 100, the second capacitor C2, the second inductor L5 and the third inductor L3 are respectively connected to a midpoint of a transformer T2, a second inductor L8 and a transformer T2; the third capacitor C3, the third capacitor C6 and the third capacitor C9 are respectively connected to the different name terminals of the primary windings of the first transformer T1, the second transformer T2 and the third transformer T3.
In this embodiment, when energy flows in the forward direction, that is, when energy flows from the first connection side to the second connection side, the first connection side of the three-phase interleaved wide-range high-efficiency isolating bidirectional converter 10 serves as a dc input end and can be connected with an external power supply, and the second connection side thereof serves as a dc output end and can be connected with an external load; when the energy flows in the reverse direction, i.e., the energy flows from the second connection side to the first connection side, the second connection side of the three-phase interleaved wide-range high-efficiency isolated bidirectional converter 10 serves as the dc input terminal, and the first connection side thereof serves as the dc output terminal. The utility model discloses crisscross wide range high efficiency of three-phase keeps apart bidirectional converter 10 simple structure, and resonant circuit's equivalent circuit is multi-element resonant circuit when the energy is positive reverse flow, can all realize soft switch during forward reverse work, and the loss is little, has solved the not enough problem of reverse gain of traditional LLC resonant circuit, can raise the pressure when the energy flows from second connection side to first connection side, can effectively promote the input/output voltage scope of converter 10, realizes wide voltage range input/output, is applicable in high power circuit; and compare in the crisscross bidirectional converter's of three-phase switching frequency among the prior art switching frequency needs wide band control just can realize voltage wide range input/output, the utility model discloses the crisscross wide range high efficiency of three-phase is kept apart bidirectional converter 10 and is less because of its resonance frequency who resets resonance circuit, does not need wide band control to realize wide voltage range output when adopting switch frequency modulation control, and switching control frequency can compress to narrow down promptly, raises the efficiency.
In some embodiments, the three-phase bridge switching circuit 100 includes six switching tubes, namely a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, a fifth switching tube Q5 and a sixth switching tube Q6, where each two switching tubes are connected in series to form a bridge arm, and after three bridge arms are connected in parallel, two ends of each three bridge arm are used as a first connection side of the three-phase interleaved wide-range efficient isolated bidirectional converter 10, where a midpoint of a bridge arm formed by connecting the first switching tube Q1 and the second switching tube Q2 in series is connected to the first resonant circuit, a midpoint of a bridge arm formed by connecting the third switching tube Q3 and the fourth switching tube Q4 in series is connected to the second resonant circuit, and a midpoint of a bridge arm formed by connecting the fifth switching tube Q5 and the sixth switching tube Q6 in series is connected to the third resonant circuit. In this embodiment, adopt the work of PFM mode control switch tube, adopt invariable duty cycle promptly, with the conduction and the turn-off time of invariable switch tube, then realize the regulation with the modulation square wave frequency mode, the switching frequency of the crisscross bidirectional converter of three-phase among the prior art needs wide band control, just can realize voltage wide range input/output, need step up to the 400v with 40v promptly, switching frequency all need take fully to be loaded with, frequency is up to 200KHZ when fully loaded with, reaches 250KHZ when empty, and the utility model discloses a control range of 10 switching frequencies of the crisscross wide range high-efficient isolated bidirectional converter of three-phase is less relatively, under the same condition of boost gain, switching frequency only is 160KHZ when fully loaded, and efficiency is higher.
In the embodiment shown in the drawings, the three-phase bridge rectifier circuit 300 includes six switching tubes, namely a seventh switching tube Q7, an eighth switching tube Q8, a ninth switching tube Q9, a tenth switching tube Q10, an eleventh switching tube Q11 and a twelfth switching tube Q12, each two switching tubes are connected in series to form a bridge arm, and two ends of each three bridge arms are used as the second connection side of the three-phase interleaved wide-range efficient isolation bidirectional converter 10 after being connected in parallel, wherein a midpoint of a bridge arm formed by connecting the seventh switching tube Q7 and the eighth switching tube Q8 in series is connected with the secondary winding of the first transformer T1, a midpoint of a bridge arm formed by connecting the ninth switching tube Q9 and the tenth switching tube Q10 in series is connected with the secondary winding of the second transformer T2, and a midpoint of a bridge arm formed by connecting the eleventh switching tube Q11 and the twelfth switching tube Q12 in series is connected with the secondary winding of the third transformer T3. Based on the design, when energy flows in the forward direction, the three-phase bridge rectifier circuit 300 can rectify the voltage waveform periodically output by the transformer to generate the working voltage required by the load. Preferably, the switch tube can be selected from a MOSFET, an IGBT tube, a GaN tube, a SiC power tube or other controllable power switch tubes to achieve better circuit performance, and in some other embodiments, a diode can be connected in parallel to each switch tube.
Further, the three-phase interleaved wide-range high-efficiency isolation bidirectional converter 10 further includes a first filter capacitor C10 and a second filter capacitor C11, two ends of the first filter capacitor C10 are connected to the first connection side of the three-phase interleaved wide-range high-efficiency isolation bidirectional converter 10, and two ends of the second filter capacitor C11 are connected to the second connection side of the three-phase interleaved wide-range high-efficiency isolation bidirectional converter 10.
Understandably, in this embodiment, when energy is transmitted in the forward direction, the wide-range voltage output of the three-phase interleaved wide-range high-efficiency isolated bidirectional converter 10 is realized by controlling the switching frequencies of the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5 and the sixth switching tube Q6, and the two switching tubes on each bridge arm are complementarily turned on, so that the circuit soft switching can be realized; when energy is transmitted reversely, an equivalent circuit of the resonant circuit is also a multi-element resonant circuit, so that the wide-range voltage output same as that during forward transmission can be realized by controlling the switching frequency of the seventh switching tube Q7, the eighth switching tube Q8, the ninth switching tube Q9, the tenth switching tube Q10, the eleventh switching tube Q11 and the twelfth switching tube Q12, and the two switching tubes on each bridge arm are conducted in a complementary manner, so that the soft switching of the circuit can be realized.
The utility model discloses three-phase staggered wide-range efficient isolation bidirectional converter 10 adopts the three-phase staggered technology, the conduction phase difference of Q1 and Q2, Q3 and Q4, Q5 and Q6 is 180 degrees, and the conduction time sequence of Q1, Q3 and Q5 is 120 degrees different from each other; therefore, the conduction time sequences of Q2, Q4 and Q6 are different by 120 degrees, the phase difference of the three-phase input and output currents is 120 degrees, the input and output current fluctuation of the three-phase circuit is complementary, the input and output current ripple is small, and good circuit performance is achieved. At any moment, at least one of Q1, Q3 and Q5 is conducted at most two, and at least one of Q2, Q4 and Q6 is conducted at most two, and the number of the conducted switching tubes is equal to three all the time. Taking one of the three resonant circuits as an example, when Q1, Q4 and Q6 are turned on, the resonant dc voltage is transmitted to the first transformer T1 through the first switching tube Q1, and meanwhile, the current value of the first resonant circuit is increased to store energy, and meanwhile, the seventh switching tube Q7 is turned on, and the second filter capacitor C11 is used for rectifying and filtering the output voltage of the first transformer T1 to output a stable voltage and control the output current; when Q2, Q3 and Q5 switch on, resonance direct current reverse voltage conveys to first transformer T1 through second switch tube Q2, and the reverse current value of first resonant circuit increases simultaneously, supplies power to first transformer T1, and eighth switch tube Q8 switches on, realizes rectifying, filtering to the output voltage of first transformer T1 to output stable voltage, control output current. Similarly, the working principle of the other two resonant circuits is consistent with that of the other two resonant circuits.
Referring to fig. 2, fig. 2 is a circuit diagram of a second embodiment of the three-phase interleaved wide-range high-efficiency isolating bidirectional converter 10 according to the present invention, which is different from the first embodiment in the specific connections of the resonant circuit, the inverter circuit and the transformer in the resonant cavity 200, and the rest of the circuit structures are the same or similar. In this embodiment, a midpoint of a bridge arm formed by connecting the first switching tube Q1 and the second switching tube Q2 in series is connected to a second capacitor C2 in the first resonant circuit, a midpoint of a bridge arm formed by connecting the third switching tube Q3 and the fourth switching tube Q4 in series is connected to a second capacitor C5 in the second resonant circuit, a midpoint of a bridge arm formed by connecting the fifth switching tube Q5 and the sixth switching tube Q6 in series is connected to a second capacitor C8 in the third resonant circuit, the third inductor L3, the third inductor L6 and the third inductor L9 are respectively connected to each other to form a Y-type connection, and the third capacitor C3, the third capacitor C6 and the third capacitor C9 are respectively and correspondingly connected to corresponding terminals of primary windings of the first transformer T1, the second transformer T2 and the third transformer T3; the second inductor L2, the second inductor L5 and the second inductor L8 are respectively connected to the different-name terminals of the primary windings of the first transformer T1, the second transformer T2 and the third transformer T3.
Referring to fig. 3, fig. 3 is a schematic circuit diagram of a third embodiment of the three-phase interleaved wide-range high-efficiency isolating bidirectional converter 10 according to the present invention, which is different from the first embodiment in that the specific structure of the resonant circuit in the resonant cavity 200 is different, and the rest of the circuit structures are the same or similar. In this embodiment, the resonant circuit includes a first capacitor, a second capacitor, a first inductor, a second inductor, and a third inductor, one end of each of the first inductor and the second inductor is connected to one end of the first capacitor and the second capacitor, the other end of the first inductor is connected to one end of the third inductor and connected to a midpoint of a bridge arm in the three-phase bridge switching circuit, the other ends of the second inductor and the second capacitor are connected to a primary winding of a transformer, the other end of the second inductor is connected to the other end of the third inductor, and the other ends of the first capacitors in the three resonant circuits are connected to each other to form a Y-type connection.
As can be seen from the figure, specifically, the resonant cavity 200 includes a first resonant circuit, a second resonant circuit and a third resonant circuit, the first resonant circuit includes a first capacitor C1, a second capacitor C2, a first inductor L1, a second inductor L2 and a third inductor L3, the second resonant circuit includes a first capacitor C3, a second capacitor C4, a first inductor L4, a second inductor L5 and a third inductor L6, the third resonant circuit includes a first capacitor C5, a second capacitor C6, a first inductor L7, a second inductor L8 and a third inductor L9, in the embodiment shown in the drawings, one end of each of the third inductor L3, the third inductor L6 and the third inductor L9 is correspondingly connected to a midpoint of three bridge arms of the three-phase bridge type switching circuit 100, the other end of each of the third inductor L3, the third inductor L6 and the third inductor L9 is correspondingly connected to a middle point of a same bridge arm of the first transformer T1, the second transformer T2 and the same bridge type transformer T3, the second capacitor C1, the second inductor L5 and the third inductor L6, and the other end of the same bridge type transformer T1 are correspondingly connected to a primary winding of the first capacitor C1, the second capacitor C4, the third inductor L6, and the third capacitor C3. The present embodiment can also effectively increase the input/output voltage range of the converter 10, and realize wide voltage range input/output, and when the switching frequency modulation control is adopted, the wide voltage range output can be realized without wide frequency control, i.e. the switching frequency can be compressed and narrowed, and the efficiency is improved.
Referring to fig. 4, fig. 4 is a schematic circuit diagram of a fourth embodiment of the three-phase interleaved wide-range high-efficiency isolating bidirectional converter 10 according to the present invention, which is different from the first embodiment in that the specific structure of the resonant circuit in the resonant cavity 200 is different, and the rest of circuit structures are the same or similar. In this embodiment, the resonant circuit includes a first capacitor, a second capacitor, a first inductor, a second inductor, and a third inductor, one end of the first inductor is connected to one ends of the first capacitor and the third inductor, one end of the second inductor is connected to the other end of the third inductor and one end of the second capacitor, the other end of the first capacitor is connected to a midpoint of a bridge arm in the three-phase bridge switching circuit, the other ends of the second inductor and the second capacitor are connected to a primary winding of a transformer, and the other end of the second inductor is connected to the other end of the first inductor.
As can be seen from the figure, in particular, the resonant cavity 200 includes a first resonant circuit, a second resonant circuit and a third resonant circuit, the first resonant circuit includes a first capacitor C1, a second capacitor C2, a first inductor L1, a second inductor L2 and a third inductor L3, the second resonant circuit includes a first capacitor C3, a second capacitor C4, a first inductor L4, a second inductor L5 and a third inductor L6, the third resonant circuit includes a first capacitor C5, a second capacitor C6, a first inductor L7, a second inductor L8 and a third inductor L9, in the embodiment shown in the figure, the first capacitor C1, the first capacitor C3, and the first capacitor C5 are respectively and correspondingly connected to midpoints of three bridge arms of the three-phase bridge switch circuit 100, the second capacitor C2, the second capacitor C4, and the second capacitor C6 are respectively and correspondingly connected to dotted ends of primary windings of the first transformer T1, the second transformer T2, and the third transformer T3, the second inductor L2, the second inductor L5, and the second inductor L8 are respectively and correspondingly connected to dotted ends of primary windings of the first transformer T1, the second transformer T2, and the third transformer T3, and the dotted ends of the primary windings and the secondary windings of the first transformer T1, the second transformer T2, and the third transformer T3 are respectively and mutually connected to form a Y-type connection.
To sum up, the utility model discloses each circuit adopts the crisscross technique of three-phase to reduce the ripple among the crisscross wide range high-efficient isolated bidirectional converter of three-phase, and the equivalent circuit of resonant circuit when the energy forward and reverse flows is multi-element resonant circuit, and the soft switch is realized to the forward and reverse during operation, and the loss is less, has solved the problem that traditional LLC resonant circuit can not reverse equivalent performance work, promptly the utility model discloses the crisscross wide range high-efficient isolated bidirectional converter of three-phase can boost when the energy backward flow, can effectively promote the input/output voltage scope of converter, realizes wide voltage range output, and the gain is the same when the energy forward and reverse flows simultaneously, just the utility model discloses resonant circuit's structural design does not need wide band control to realize wide voltage range output when adopting switch frequency modulation control, and switch control frequency narrows down promptly, raises the efficiency.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not intended to limit the invention in any way. Various equivalent changes and modifications can be made on the basis of the above embodiments by those skilled in the art, and all equivalent changes and modifications within the scope of the claims should fall within the protection scope of the present invention.
Claims (8)
1. A three-phase alternating wide-range high-efficiency isolation bidirectional converter is characterized in that: the three-phase staggered wide-range efficient isolation bidirectional converter comprises a three-phase bridge type switching circuit, a resonant cavity, three transformers and a three-phase bridge type rectifying circuit, wherein one side of the three-phase bridge type switching circuit and one side of the three-phase bridge type rectifying circuit are respectively used as a first connecting side and a second connecting side of the three-phase staggered wide-range efficient isolation bidirectional converter, the resonant cavity comprises three resonant circuits, the three resonant circuits are respectively and correspondingly connected between the middle points of three bridge arms of the three-phase bridge type switching circuit and primary windings of the three transformers, wherein,
the resonant circuit comprises a first capacitor, a second capacitor, a third capacitor, a first inductor, a second inductor and a third inductor, one end of the first inductor is connected with one ends of the second inductor, the first capacitor and the third capacitor, the other ends of the first inductor and the first capacitor are respectively connected with one ends of the third inductor and the second capacitor, one end of the third inductor is connected to the midpoint of one bridge arm in the three-phase bridge type switching circuit, the other ends of the second inductor and the third capacitor are respectively connected with the other ends of the third inductor and the second capacitor and are connected with a primary winding of a transformer, the ends of the second capacitor and the first capacitor in the three resonant circuits are respectively connected with each other to form Y-shaped connection, the homonymous ends of the secondary windings of the three transformers are respectively correspondingly connected with the midpoint of the three bridge arms of the three-phase bridge type rectifying circuit, and the synonym ends of the secondary windings of the three transformers are respectively connected with each other to form Y-shaped connection.
2. The three-phase interleaved wide range high efficiency isolated bi-directional converter as claimed in claim 1 wherein: the three-phase bridge type switching circuit comprises six switching tubes, every two switching tubes are connected in series to form a bridge arm, and two ends of the three bridge arms are used as the first connecting side of the three-phase staggered wide-range efficient isolation bidirectional converter after the three bridge arms are connected in parallel.
3. The three-phase interleaved wide range high efficiency isolated bi-directional converter as claimed in claim 1 wherein: the three-phase bridge rectification circuit comprises six switching tubes, every two switching tubes are connected in series to form a bridge arm, and two ends of the three bridge arms are used as second connection sides of the three-phase staggered wide-range efficient isolation bidirectional converter after the three bridge arms are connected in parallel.
4. A three-phase interleaved wide range high efficiency isolated bi-directional converter as claimed in claim 2 or 3 wherein: the switch tube is selected from a MOSFET, an IGBT tube, a GaN tube or a SiC power tube.
5. The three-phase interleaved wide range high efficiency isolated bi-directional converter as claimed in claim 1 wherein: the three-phase alternating wide-range efficient isolation bidirectional converter further comprises a first filter capacitor and a second filter capacitor, two ends of the first filter capacitor are connected to a first connecting side of the three-phase alternating wide-range efficient isolation bidirectional converter, and two ends of the second filter capacitor are connected to a second connecting side.
6. A three-phase alternating wide-range high-efficiency isolation bidirectional converter is characterized in that: the three-phase staggered wide-range efficient isolation bidirectional converter comprises a three-phase bridge type switching circuit, a resonant cavity, three transformers and a three-phase bridge type rectifying circuit, wherein one side of the three-phase bridge type switching circuit and one side of the three-phase bridge type rectifying circuit are respectively used as a first connecting side and a second connecting side of the three-phase staggered wide-range efficient isolation bidirectional converter, the resonant cavity comprises three resonant circuits, the three resonant circuits are respectively and correspondingly connected between the middle points of three bridge arms of the three-phase bridge type switching circuit and primary windings of the three transformers, wherein,
the resonant circuit comprises a first capacitor, a second capacitor, a third capacitor, a first inductor, a second inductor and a third inductor, wherein one end of the first inductor is connected with one ends of the second inductor, the first capacitor and the third capacitor, the other ends of the first inductor and the first capacitor are respectively connected with one ends of the third inductor and the second capacitor, one end of the second capacitor is connected to the middle point of a bridge arm in the three-phase bridge type switching circuit, the other ends of the second inductor and the third capacitor are respectively connected with the other ends of the third inductor and the second capacitor and are connected with a primary winding of a transformer, the ends of the third inductor and the first inductor in the three resonant circuits are respectively connected with each other to form Y-shaped connection, the homonymous ends of secondary windings of the three transformers are respectively correspondingly connected with the middle points of three bridge arms of the three-phase bridge type rectifying circuit, and the heteronymous ends of the secondary windings of the three transformers are respectively connected with each other to form Y-shaped connection.
7. A three-phase alternating wide-range high-efficiency isolation bidirectional converter is characterized in that: the three-phase staggered wide-range efficient isolation bidirectional converter comprises a three-phase bridge type switching circuit, a resonant cavity, three transformers and a three-phase bridge type rectifying circuit, wherein one side of the three-phase bridge type switching circuit and one side of the three-phase bridge type rectifying circuit are respectively used as a first connecting side and a second connecting side of the three-phase staggered wide-range efficient isolation bidirectional converter, the resonant cavity comprises three resonant circuits, the three resonant circuits are respectively and correspondingly connected between the middle points of three bridge arms of the three-phase bridge type switching circuit and primary windings of the three transformers, wherein,
the resonant circuit comprises a first capacitor, a second capacitor, a first inductor, a second inductor and a third inductor, wherein one end of the first inductor and one end of the second inductor are connected with one end of the first capacitor and one end of the second capacitor, the other end of the first inductor is connected with one end of the third inductor and is connected to the midpoint of one bridge arm in the three-phase bridge type switching circuit, the other ends of the second inductor and the second capacitor are connected with a primary winding of a transformer, the other end of the second inductor is connected with the other end of the third inductor, the other ends of the first capacitors in the three resonant circuits are connected with each other to form Y-shaped connection, the dotted ends of secondary windings of the three transformers are correspondingly connected with the midpoint of three bridge arms of the three-phase bridge type rectifying circuit respectively, and the dotted ends of secondary windings of the three transformers are connected with each other to form Y-shaped connection respectively.
8. A three-phase alternating wide-range high-efficiency isolation bidirectional converter is characterized in that: the three-phase staggered wide-range efficient isolation bidirectional converter comprises a three-phase bridge type switching circuit, a resonant cavity, three transformers and a three-phase bridge type rectifying circuit, wherein one side of the three-phase bridge type switching circuit and one side of the three-phase bridge type rectifying circuit are respectively used as a first connecting side and a second connecting side of the three-phase staggered wide-range efficient isolation bidirectional converter, the resonant cavity comprises three resonant circuits, the three resonant circuits are respectively and correspondingly connected between the middle points of three bridge arms of the three-phase bridge type switching circuit and primary windings of the three transformers, wherein,
the resonant circuit comprises a first capacitor, a second capacitor, a first inductor, a second inductor and a third inductor, wherein one end of the first inductor is connected with one ends of the first capacitor and the third inductor, one end of the second inductor is connected with the other end of the third inductor and one end of the second capacitor, the other end of the first capacitor is connected with the middle point of one bridge arm in the three-phase bridge type switching circuit, the other ends of the second inductor and the second capacitor are connected with a primary winding of a transformer, the other end of the second inductor is connected with the other end of the first inductor, the dotted ends of secondary windings of the three transformers are respectively and correspondingly connected with the middle points of three bridge arms of the three-phase bridge type rectifying circuit, and the dotted ends of the primary windings and the secondary windings of the three transformers are respectively connected with each other to form Y-shaped connection.
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| WO2024051317A1 (en) * | 2022-09-09 | 2024-03-14 | 深圳深源技术能源有限公司 | Three-phase-interleaving extended-range efficient-isolation bidirectional converter |
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