CN115765460A - Bidirectional three-level three-phase interleaved LLC converter and control method thereof - Google Patents
Bidirectional three-level three-phase interleaved LLC converter and control method thereof Download PDFInfo
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Abstract
The invention is suitable for the technical field of electronic power conversion, and provides a bidirectional three-level three-phase interleaved LLC converter and a control method thereof, wherein the bidirectional three-level three-phase interleaved LLC converter comprises a plurality of three-level three-phase interleaved LLC circuits which are connected in parallel, and each three-level three-phase interleaved LLC circuit comprises: the LLC resonant circuit comprises a primary side circuit, an LLC resonant circuit, an isolation voltage transformation circuit and a secondary side circuit, wherein the primary side circuit, the LLC resonant circuit, the isolation voltage transformation circuit and the secondary side circuit are electrically connected in sequence; the primary circuit includes the crisscross former limit three-phase full-bridge unit of three-phase, LLC resonant circuit includes the three-phase resonance unit, keep apart the vary voltage circuit include with the three transformer that the three-phase resonance unit corresponds the connection, vice limit circuit includes the vice limit three-phase full-bridge unit of three-phase. The embodiment of the invention has the advantages of wide application range, low cost and stronger voltage stress.
Description
Technical Field
The invention belongs to the technical field of electronic power conversion, and particularly relates to a bidirectional three-level three-phase interleaved LLC converter and a control method thereof.
Background
The electric isolation is implemented in an electric system, so that the safety of the system can be improved, and the problem of a grounding loop can be avoided. At present, the most widely used soft switching technology is the LLC resonant converter, which can realize zero-voltage conduction of a switching device near a resonant frequency, and has small EMI interference, and is widely applied in the field of DCDC conversion. However, in the prior art, a commonly used two-level LLC resonant converter can only be used in a situation with a low voltage level, for example, in a unidirectional DCDC conversion scenario, and if the two-level LLC resonant converter is used in a scenario with a slightly high voltage level or a scenario with bidirectional power flow, a device with a high voltage-resistant level, such as SiC, needs to be used instead, which increases the cost of the converter. In addition, the semiconductor switch tube has large current stress, so that the loss is large, the power level promotion is limited, the ripple current of the input and output direct current side capacitor is large, the service life of the capacitor is influenced, and even more direct current side capacitors are needed.
Disclosure of Invention
The embodiment of the invention provides a bidirectional three-level three-phase interleaved LLC converter, and aims to solve the problems that the existing bidirectional three-level three-phase interleaved LLC converter is high in cost, insufficient in voltage stress and difficult to adapt to multi-scenario application.
Embodiments of the present invention are achieved by providing a bidirectional three-level three-phase interleaved LLC converter, comprising: a plurality of three-level, three-phase interleaved LLC circuits in parallel, each said three-level, three-phase interleaved LLC circuit comprising: the device comprises a primary side circuit, an LLC resonant circuit, an isolation transformation circuit and a secondary side circuit;
the primary side circuit, the LLC resonant circuit, the isolation transformer circuit and the secondary side circuit are electrically connected in sequence;
the primary circuit includes the crisscross former limit three-phase full-bridge unit of three-phase, LLC resonant circuit includes the three-phase resonance unit, keep apart the vary voltage circuit include with the three transformer that the three-phase resonance unit corresponds the connection, vice limit circuit includes the vice limit three-phase full-bridge unit of three-phase, the first bridge arm mid point of former limit three-phase full-bridge unit the second bridge arm mid point of former limit three-phase full-bridge unit and the third bridge arm mid point of former limit three-phase full-bridge unit correspond with the three-phase resonance unit electricity is connected, the first bridge arm mid point of vice limit three-phase full-bridge unit the second bridge arm mid point of vice limit three-phase full-bridge unit the third bridge arm mid point one-to-point of vice limit three-phase full-bridge unit with the vice limit electricity of three transformer is connected.
Furthermore, the primary side circuit further includes a first positive input terminal, a first N terminal, and a first dc-side capacitor, where a first terminal of the first dc-side capacitor is electrically connected to the first positive input terminal, and a second terminal of the first dc-side capacitor is electrically connected to the first N terminal.
Furthermore, the primary side three-phase full-bridge unit comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube;
the source electrode of the first switching tube is electrically connected with the drain electrode of the second switching tube to form a first bridge arm of the primary side three-phase full-bridge unit;
the source electrode of the third switching tube is electrically connected with the drain electrode of the fourth switching tube to form a second bridge arm of the primary three-phase full-bridge unit;
the source electrode of the fifth switching tube is electrically connected with the drain electrode of the sixth switching tube to form a third bridge arm of the primary three-phase full-bridge unit;
the first direct current side capacitor, the first bridge arm of the primary side three-phase full-bridge unit, the second bridge arm of the primary side three-phase full-bridge unit and the third bridge arm of the primary side three-phase full-bridge unit are connected in parallel; wherein the content of the first and second substances,
the first end of the first direct current side capacitor is electrically connected with the drain electrode of the first switch tube, the drain electrode of the third switch tube and the drain electrode of the fifth switch tube, and the second end of the first direct current side capacitor is electrically connected with the source electrode of the second switch tube, the source electrode of the fourth switch tube and the source electrode of the sixth switch tube.
Furthermore, the three-phase resonance unit comprises an A-phase resonance unit, a B-phase resonance unit and a C-phase resonance unit; wherein, the first and the second end of the pipe are connected with each other,
the A-phase resonance unit comprises a first resonance capacitor and a first resonance inductor, one end of the first resonance capacitor is electrically connected with the midpoint of a first bridge arm of the primary three-phase full-bridge unit, the other end of the first resonance capacitor is electrically connected with one end of the first resonance inductor, and the other end of the first resonance inductor is electrically connected with the first end of the primary side of the corresponding A-phase transformer;
the B-phase resonance unit comprises a second resonance capacitor and a second resonance inductor, one end of the second resonance capacitor is electrically connected with the midpoint of a second bridge arm of the primary side three-phase full-bridge unit, the other end of the second resonance capacitor is electrically connected with one end of the second resonance inductor, and the other end of the second resonance inductor is electrically connected with the first end of the primary side of the corresponding B-phase transformer;
the C-phase resonance unit comprises a third resonance capacitor and a third resonance inductor, one end of the third resonance capacitor is electrically connected with the midpoint of a third bridge arm of the primary side three-phase full-bridge unit, the other end of the third resonance capacitor is electrically connected with one end of the third resonance inductor, and the other end of the third resonance inductor is electrically connected with the first end of the primary side of the corresponding C-phase transformer;
the second end of the primary side of the phase-A transformer is electrically connected with the second end of the primary side of the phase-B transformer and the second end of the primary side of the phase-C transformer respectively.
Furthermore, the secondary side circuit further comprises a second positive input end, a second N end and a second dc side capacitor, wherein a first end of the second dc side capacitor is electrically connected to the second positive input end, and a second end of the second dc side capacitor is electrically connected to the second N end.
Furthermore, the secondary three-phase full-bridge unit comprises a seventh switching tube, an eighth switching tube, a ninth switching tube, a tenth switching tube, an eleventh switching tube and a twelfth switching tube;
a source electrode of the seventh switching tube is electrically connected with a drain electrode of the eighth switching tube to form a first bridge arm of the secondary three-phase full-bridge unit;
the source electrode of the ninth switching tube is electrically connected with the drain electrode of the tenth switching tube to form a second bridge arm of the secondary side three-phase full-bridge unit;
a source electrode of the eleventh switching tube is electrically connected with a drain electrode of the twelfth switching tube to form a third bridge arm of the secondary side three-phase full-bridge unit;
the second direct-current side capacitor, the first bridge arm of the secondary three-phase full-bridge unit, the second bridge arm of the secondary three-phase full-bridge unit and the third bridge arm of the secondary three-phase full-bridge unit are connected in parallel; wherein the content of the first and second substances,
a first end of the second direct-current side capacitor is electrically connected with a drain electrode of the seventh switching tube, a drain electrode of the ninth switching tube and a drain electrode of the eleventh switching tube, and a second end of the second direct-current side capacitor is electrically connected with a source electrode of the eighth switching tube, a source electrode of the tenth switching tube and a source electrode of the twelfth switching tube.
Furthermore, the transformer circuit further comprises a current transformer circuit, and the current transformer circuit is arranged between the isolation transformation circuit and the secondary side circuit.
Furthermore, the current transformer circuit comprises a phase A current transformer, a phase B current transformer and a phase C current transformer;
the phase A current transformer is connected between the first end of the secondary side of the phase A transformer and the midpoint of a first bridge arm of the secondary side three-phase full-bridge unit;
the phase B current transformer is connected between the first end of the secondary side of the phase B transformer and the midpoint of a second bridge arm of the secondary side three-phase full-bridge unit;
the C-phase current transformer is connected between the first end of the secondary side of the C-phase transformer and the midpoint of the third bridge arm of the secondary side three-phase full-bridge unit;
and the second end of the secondary side of the A-phase transformer is electrically connected with the second end of the secondary side of the B-phase transformer and the second end of the secondary side of the C-phase transformer respectively.
The embodiment of the invention also provides a control method of the bidirectional three-level three-phase interleaved LLC converter, which comprises the following steps:
setting duty ratios of switching tubes of a primary side three-phase full-bridge unit and switching tubes of a secondary side three-phase full-bridge unit in the three-level three-phase interleaved LLC circuits, wherein the duty ratios of the switching tubes of different bridge arms of the primary side three-phase full-bridge unit are different from each other by 120 degrees, the switching tubes of the same bridge arm are complementary in opposite phase and are provided with first dead time, and second dead time is arranged between the duty ratios of the switching tubes of the primary side three-phase full-bridge unit and the switching tubes of the secondary side three-phase full-bridge unit;
and controlling the bidirectional three-level three-phase interleaved LLC converter to perform bidirectional charging and discharging according to the set duty ratio.
Furthermore, the step of setting the duty ratios of the switching tubes of the primary three-phase full-bridge unit and the switching tubes of the secondary three-phase full-bridge unit in the plurality of three-level three-phase interleaved LLC circuits includes:
setting the driving waveform of the first switching tube of the primary side three-phase full-bridge unit to be 120 degrees ahead of the driving waveform of the third switching tube, and setting the driving waveform of the third switching tube to be 120 degrees ahead of the driving waveform of the fifth switching tube;
setting the reverse complementary conduction of the driving waveforms of the switching tubes of the same bridge arm of the primary three-phase full-bridge unit, wherein the reverse complementary conduction of the driving waveforms of the second switching tube and the first switch is set, the reverse complementary conduction of the driving waveforms of the fourth switching tube and the third switching tube is set, and the reverse complementary conduction of the driving waveforms of the sixth switching tube and the fifth switching tube is set;
setting first dead time between switching tubes of the same bridge arm of the primary side three-phase full-bridge unit, wherein the first dead time is respectively set between a driving waveform of the first switching tube and a driving waveform of the second switching tube, between a driving waveform of the third switching tube and a driving waveform of the fourth switching tube, and between a driving waveform of the fifth switching tube and a driving waveform of the sixth switching tube;
set up second dead time between the switch tube of former limit three-phase full-bridge unit and the switch tube of secondary three-phase full-bridge unit, wherein the drive waveform of the first switch tube of former limit three-phase full-bridge unit with between the drive waveform of the seventh switch tube of secondary three-phase full-bridge unit, the drive waveform of the second switch tube of former limit three-phase full-bridge unit with between the drive waveform of the eighth switch tube of secondary three-phase full-bridge unit, the drive waveform of the third switch tube of former limit three-phase full-bridge unit with between the drive waveform of the ninth switch tube of secondary three-phase full-bridge unit, the drive waveform of the fourth switch tube of former limit three-phase full-bridge unit with between the drive waveform of the tenth switch tube of secondary three-phase full-bridge unit, the drive waveform of the fifth switch tube of former limit three-phase full-bridge unit with between the drive waveform of the eleventh switch tube of secondary three-phase full-bridge unit, and be provided with second dead time respectively between the drive waveform of the sixth switch tube of former limit three-phase full-bridge unit and the drive waveform of secondary twelve switch tube.
The bidirectional three-level three-phase interleaved LLC converter has the advantages that the plurality of three-level three-phase interleaved LLC circuits are connected in parallel, the duty ratios of the switching tubes of different bridge arms in the primary three-phase full bridge unit of each three-level three-phase interleaved LLC circuit are controlled to be 120 degrees different from each other, a first dead time is set between the duty ratios of the switching tubes of the same bridge arm, and a second dead time is set between the duty ratios of the switching tubes of the primary three-phase full bridge unit and the secondary three-phase full bridge unit so as to control the bidirectional three-level three-phase interleaved LLC converter to work bidirectionally. Therefore, the three-phase LLC is adopted, so that the current stress of each semiconductor device is reduced, and the power level of the converter can be further improved; because the ripple current of the capacitor at the input side and the output side can be reduced due to three-phase interleaving (the interleaving is 120 degrees), the heat productivity of the capacitor can be reduced, the capacitance value at the direct current side is very small, the number of the capacitors is reduced, the volume of the capacitors is also reduced, the service life of the capacitors is prolonged, and the reliability is enhanced; the voltage stress of the converter can be improved by adopting three levels, and the converter can use a semiconductor device with low withstand voltage, so that the cost is reduced; due to the adoption of the bidirectional topology, the converter can be suitable for scenes in which power needs to flow bidirectionally, such as energy storage, battery charging and discharging and the like, and has wider application range. Therefore, the embodiment of the invention has wide application range, low cost and strong voltage stress.
Drawings
Fig. 1 is a circuit diagram of a bidirectional three-level three-phase interleaved LLC converter according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of a bidirectional three-level three-phase interleaved LLC converter according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method provided by S101 in the embodiment of FIG. 2;
FIG. 4 is a graph comparing duty cycles of various waveforms provided by embodiments of the present invention;
the circuit comprises a first three-level three-phase interleaved LLC circuit, a primary side circuit, a 3 LLC resonant circuit, a 4 isolating transformation circuit, a 5 secondary side circuit, a 6 current transformer circuit, a 7 second three-level three-phase interleaved LLC circuit, a first three-level three-phase interleaved LLC circuit, a second three-level three-phase interleaved LLC resonant circuit, a primary side circuit, a second three-level resonant circuit, a second three-phase interleaved LLC circuit and a third three-phase interleaved LLC resonant circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
According to the bidirectional three-level three-phase interleaved LLC converter, a plurality of three-level three-phase interleaved LLC circuits are connected in parallel, the duty ratios of the switching tubes of different bridge arms in a primary three-phase full bridge unit of each three-level three-phase interleaved LLC circuit are controlled to be 120 degrees different from each other, a first dead time is set between the duty ratios of the switching tubes of the same bridge arm, and a second dead time is set between the duty ratios of the switching tubes of the primary three-phase full bridge unit and the secondary three-phase full bridge unit so as to control the bidirectional three-level three-phase interleaved LLC converter to work bidirectionally. Therefore, the three-phase LLC is adopted, so that the current stress of each semiconductor device is reduced, and the power level of the converter can be further improved; ripple current of the capacitor on the input side and the output side can be reduced due to three-phase staggering (120 degrees from each other), the heat productivity of the capacitor can be reduced, the capacitance value on the direct current side is very small, the number of the capacitors is reduced, the volume of the capacitors is also reduced, the service life of the capacitors is prolonged, and the reliability is enhanced; the voltage stress of the converter can be improved by adopting three levels, and the converter can use a semiconductor device with low withstand voltage, so that the cost is reduced; due to the adoption of the bidirectional topology, the converter can be suitable for scenes in which power needs to flow bidirectionally, such as energy storage, battery charging and discharging and the like, and has wider application range. Therefore, the embodiment of the invention has wide application range, low cost and strong voltage stress.
Example one
Referring to fig. 1, an embodiment of the present invention provides a bidirectional three-level and three-phase interleaved LLC converter, which can be used in bidirectional charging and discharging scenarios, such as energy storage, battery charging and discharging, and the like. In this embodiment, the bidirectional three-level three-phase interleaved LLC converter includes: a plurality of three-level three-phase interleaved LLC circuits in parallel, each three-level three-phase interleaved LLC circuit comprising: a primary side circuit 2, an LLC resonant circuit 3, an isolation transformer circuit 4 and a secondary side circuit 5;
the primary side circuit 2, the LLC resonant circuit 3, the isolation transformation circuit 4 and the secondary side circuit 5 are electrically connected in sequence;
the primary circuit 2 comprises primary three-phase full-bridge units with three staggered phases, the LLC resonant circuit 3 comprises three-phase resonant units, the isolation transformation circuit 4 comprises three transformers correspondingly connected with the three-phase resonant units, the secondary circuit 5 comprises three-phase secondary three-phase full-bridge units, a first bridge arm midpoint of the primary three-phase full-bridge units, a second bridge arm midpoint of the primary three-phase full-bridge units and a third bridge arm midpoint of the primary three-phase full-bridge units correspond to each other and are electrically connected with the three-phase resonant units, and the first bridge arm midpoint of the secondary three-phase full-bridge units, the second bridge arm midpoint of the secondary three-phase full-bridge units and the third bridge arm midpoint of the secondary three-phase full-bridge units correspond to each other one by one and are electrically connected with secondary sides of the three transformers.
In the present embodiment, as shown in fig. 1, two three-level three-phase interleaved LLC circuits are mainly described as an example in parallel. In fig. 1, the two three-level, three-phase interleaved LLC circuits are a first three-level, three-phase interleaved LLC circuit 1 and a second three-level, three-phase interleaved LLC circuit 7, respectively. It should be noted that the first three-level three-phase interleaved LLC circuit 1 and the second three-level three-phase interleaved LLC circuit 7 work on the same principle. In the present embodiment, a three-level three-phase interleaved LLC circuit corresponding to the first three-level three-phase interleaved LLC circuit 1 is mainly described as an example. Of course, the number of the three-level three-phase interleaved LLC circuits can be increased according to actual needs.
In this embodiment, as shown in fig. 1, the primary side circuit 2 further includes a first positive input terminal DC BUS1, a first N terminal N1, and a first DC side capacitor C4, wherein a first terminal of the first DC side capacitor C4 is electrically connected to the first positive input terminal DC BUS1, and a second terminal of the first DC side capacitor C4 is electrically connected to the first N terminal N1. The first dc-side capacitor C4 is an input/output capacitor.
In this embodiment, the primary three-phase full-bridge unit includes 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; the source electrode of the first switching tube Q1 is electrically connected with the drain electrode of the second switching tube Q2 to form a first bridge arm of the primary three-phase full-bridge unit; the source electrode of the third switching tube Q3 is electrically connected with the drain electrode of the fourth switching tube Q4 to form a second bridge arm of the primary three-phase full-bridge unit; the source electrode of the fifth switching tube Q5 is electrically connected with the drain electrode of the sixth switching tube Q6 to form a third bridge arm of the primary three-phase full-bridge unit; the first direct current side capacitor C4, the first bridge arm of the primary three-phase full-bridge unit, the second bridge arm of the primary three-phase full-bridge unit and the third bridge arm of the primary three-phase full-bridge unit are connected in parallel, wherein the first end of the first direct current side capacitor C4 is electrically connected with the drain electrode of the first switch tube Q1, the drain electrode of the third switch tube Q3 and the drain electrode of the fifth switch tube Q5, and the second end of the first direct current side capacitor C4 is electrically connected with the source electrode of the second switch tube Q2, the source electrode of the fourth switch tube Q4 and the source electrode of the sixth switch tube Q6.
In the present embodiment, the three-phase resonance unit includes an a-phase resonance unit, a B-phase resonance unit, and a C-phase resonance unit; the A-phase resonance unit comprises a first resonance capacitor C6 and a first resonance inductor L7, one end of the first resonance capacitor C6 is electrically connected with the midpoint of a first bridge arm of the primary side three-phase full-bridge unit, the other end of the first resonance capacitor C6 is electrically connected with one end of the first resonance inductor L7, and the other end of the first resonance inductor L7 is electrically connected with the first end of the primary side of the corresponding A-phase transformer T1; the B-phase resonance unit comprises a second resonance capacitor C7 and a second resonance inductor L8, one end of the second resonance capacitor C7 is electrically connected with the midpoint of a second bridge arm of the primary side three-phase full-bridge unit, the other end of the second resonance capacitor C7 is electrically connected with one end of the second resonance inductor L8, and the other end of the second resonance inductor L8 is electrically connected with the first end of the primary side of the corresponding B-phase transformer T2; the C-phase resonance unit comprises a third resonance capacitor C8 and a third resonance inductor L9, one end of the third resonance capacitor C8 is electrically connected with the middle point of a third bridge arm of the primary three-phase full-bridge unit, the other end of the third resonance capacitor C8 is electrically connected with one end of the third resonance inductor L9, and the other end of the third resonance inductor L9 is electrically connected with the first end of the primary side of the corresponding C-phase transformer T3; the second end of the primary side of the phase-a transformer T1 is electrically connected to the second end of the primary side of the phase-B transformer T2 and the second end of the primary side of the phase-C transformer T3, respectively.
In this embodiment, the secondary side circuit 5 further includes a second positive input terminal DC-BUS2, a second N terminal N2, and a second DC side capacitor C12, wherein a first terminal of the second DC side capacitor C12 is electrically connected to the second positive input terminal DC-BUS2, and a second terminal of the second DC side capacitor C12 is electrically connected to the second N terminal N2. The second dc-side capacitor C12 is an input/output capacitor.
In this embodiment, the secondary three-phase full-bridge unit includes 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; the source electrode of the seventh switching tube Q7 is electrically connected with the drain electrode of the eighth switching tube Q8 to form a first bridge arm of the secondary three-phase full-bridge unit; the source electrode of the ninth switching tube Q9 is electrically connected with the drain electrode of the tenth switching tube Q10 to form a second bridge arm of the secondary three-phase full-bridge unit; a source electrode of the eleventh switch tube Q11 is electrically connected with a drain electrode of the twelfth switch tube Q12 to form a third bridge arm of the secondary three-phase full-bridge unit; a second direct-current side capacitor C12, a first bridge arm of the secondary three-phase full-bridge unit, a second bridge arm of the secondary three-phase full-bridge unit and a third bridge arm of the secondary three-phase full-bridge unit are connected in parallel; a first end of the second dc-side capacitor C12 is electrically connected to the drain of the seventh switching tube Q7, the drain of the ninth switching tube Q9, and the drain of the eleventh switching tube Q11, and a second end of the second dc-side capacitor C12 is electrically connected to the source of the eighth switching tube Q8, the source of the tenth switching tube Q10, and the source of the twelfth switching tube Q12.
In this embodiment, a plurality of three-level three-phase interleaved LLC circuits are connected in parallel, and the duty ratios of the switching tubes of different bridge arms in the primary three-phase full bridge unit of each three-level three-phase interleaved LLC circuit are controlled to be different by 120 °, and a first dead time is set between the duty ratios of the switching tubes of the same bridge arm, and at the same time, a second dead time is set between the duty ratios of the switching tubes of the primary three-phase full bridge unit and the secondary three-phase full bridge unit, so as to control the bidirectional three-level three-phase interleaved LLC converter to perform bidirectional operation. Therefore, the three-phase LLC is adopted, so that the current stress of each semiconductor device is reduced, and the power level of the converter can be further improved; ripple current of the capacitor on the input side and the output side can be reduced due to three-phase staggering (120 degrees from each other), the heat productivity of the capacitor can be reduced, the capacitance value on the direct current side is very small, the number of the capacitors is reduced, the volume of the capacitors is also reduced, the service life of the capacitors is prolonged, and the reliability is enhanced; the voltage stress of the converter can be improved by adopting three levels, and the converter can use a semiconductor device with low withstand voltage, so that the cost is reduced; due to the adoption of the bidirectional topology, the converter can be suitable for scenes in which power needs to flow bidirectionally, such as energy storage, battery charging and discharging and the like, and has wider application range. Therefore, the embodiment of the invention has the advantages of wide application range, low cost and strong voltage stress.
Example two
In this embodiment, based on the above-mentioned embodiment, as a possible implementation manner, referring to fig. 1, the bidirectional three-level three-phase interleaved LLC converter further includes a current transformer circuit 6, where the current transformer circuit 6 is disposed between the isolation transformer circuit 4 and the secondary side circuit 5.
In this embodiment, the current transformer circuit 6 includes an a-phase current transformer CT1, a B-phase current transformer CT2, and a C-phase current transformer CT3, where the a-phase current transformer CT1 is connected between a first end of a secondary side of the a-phase transformer T1 and a midpoint of a first bridge arm of the secondary side three-phase full-bridge unit; the phase B current transformer CT2 is connected between the first end of the secondary side of the phase B transformer T2 and the midpoint of a second bridge arm of the secondary side three-phase full-bridge unit; the C-phase current transformer CT3 is connected between the first end of the secondary side of the C-phase transformer T3 and the middle point of the third bridge arm of the secondary side three-phase full-bridge unit; the second end of the secondary side of the phase A transformer T1 is electrically connected with the second end of the secondary side of the phase B transformer T2 and the second end of the secondary side of the phase C transformer T3 respectively.
The A-phase current transformer CT1, the B-phase current transformer CT2 and the C-phase current transformer CT3 play a role in overcurrent protection.
In this embodiment, during the circuit operation, the current at the first end of the secondary side of the phase-a transformer T1 is detected by the phase-a current transformer CT1, and when the current is detected to be too large, the control circuit stops operating. And detecting the current of the first end of the secondary side of the phase B transformer T2 through the phase B current transformer CT2, and stopping the control circuit when detecting that the current is overlarge. And detecting the current of the first end of the secondary side of the C-phase transformer T3 through the C-phase current transformer CT3, and stopping the control circuit when detecting that the current is overlarge. Therefore, the real-time monitoring of the working current of each phase circuit is realized, and the overcurrent protection effect is achieved.
EXAMPLE III
An embodiment of the present invention provides a control method for a bidirectional three-level three-phase interleaved LLC converter, as shown in fig. 2, the control method for the bidirectional three-level three-phase interleaved LLC converter includes the following steps:
s101, setting duty ratios of switching tubes of a primary three-phase full-bridge unit and switching tubes of a secondary three-phase full-bridge unit in a plurality of three-level three-phase interleaved LLC circuits.
The duty ratios of the switching tubes of different bridge arms of the primary three-phase full-bridge unit are different by 120 degrees, the switching tubes of the same bridge arm are complementary in opposite phase and are provided with first dead time, and second dead time is arranged between the duty ratios of the switching tubes of the primary three-phase full-bridge unit and the switching tubes of the secondary three-phase full-bridge unit.
Specifically, as shown in fig. 3, S101 includes the steps of:
s201, setting the driving waveform of a first switching tube of a primary three-phase full-bridge unit to be 120 degrees ahead of the driving waveform of a third switching tube, and setting the driving waveform of the third switching tube to be 120 degrees ahead of the driving waveform of a fifth switching tube.
As shown in fig. 4, the driving waveform of the first switch tube leads the driving waveform of the third switch tube by 120 °, that is, the driving waveform of the first switch tube leads the driving waveform of the third switch tube by 1/3 period. The driving waveform of the third switching tube leads the driving waveform of the fifth switching tube by 120 degrees, namely the driving waveform of the third switching tube leads the driving waveform of the fifth switching tube by 1/3 period. In fig. 4, PWM1 corresponds to a driving waveform of the first switching tube, PWM2 corresponds to a driving waveform of the second switching tube, PWM3 corresponds to a driving waveform of the third switching tube, PWM5 corresponds to a driving waveform of the fifth switching tube, PWM7 corresponds to a driving waveform of the seventh switching tube, ts is a duty cycle, idc1 is a dc capacitor ripple current corresponding to an a-phase LLC, idc2 is a dc capacitor ripple current corresponding to a B-phase LLC, and Idc3 is a dc capacitor ripple current corresponding to a C-phase LLC. Idc is the dc capacitor ripple current with Idc1, idc2, idc3 summed together.
S202, setting the driving waveforms of the switching tubes of the same bridge arm of the primary three-phase full-bridge unit to be reversely and complementarily conducted.
The driving waveform of the second switching tube is set to be in inverse complementary conduction with the driving waveform of the first switching tube, the driving waveform of the fourth switching tube is set to be in inverse complementary conduction with the third switching tube, and the driving waveform of the sixth switching tube is set to be in inverse complementary conduction with the fifth switching tube.
Specifically, the driving waveforms of the switching tubes of the same bridge arm of the primary three-phase full-bridge unit are reversely and complementarily conducted, so that the bridge arm is prevented from being directly connected.
And S203, setting a first dead time between the switching tubes of the same bridge arm of the primary three-phase full-bridge unit.
First dead time Tdead1 is respectively arranged between the driving waveform of the first switching tube and the driving waveform of the second switching tube, between the driving waveform of the third switching tube and the driving waveform of the fourth switching tube, and between the driving waveform of the fifth switching tube and the driving waveform of the sixth switching tube.
As shown in fig. 4, in order to prevent the bridge arm from passing through, a dead time needs to be added to the driving time between the switching tubes of the same bridge arm. In order to prevent the first bridge arm of the primary three-phase full-bridge unit from being directly connected, a first dead time Tdead1 is added to the driving time between the first switching tube and the second switching tube of the first bridge arm of the primary three-phase full-bridge unit. In order to prevent the second bridge arm of the primary three-phase full-bridge unit from being directly connected, a first dead time Tdead1 is added to the driving time between the third switching tube and the fourth switching tube of the second bridge arm of the primary three-phase full-bridge unit. In order to prevent the third bridge arm of the primary three-phase full-bridge unit from being directly connected, a first dead time Tdead1 is added to the driving time between the fifth switching tube and the sixth switching tube of the third bridge arm of the primary three-phase full-bridge unit.
And S204, setting a second dead time between the switching tubes of the primary three-phase full-bridge unit and the switching tubes of the secondary three-phase full-bridge unit.
Second dead time Tdead2 is respectively arranged between the driving waveform of the first switching tube of the primary three-phase full-bridge unit and the driving waveform of the seventh switching tube of the secondary three-phase full-bridge unit, between the driving waveform of the second switching tube of the primary three-phase full-bridge unit and the driving waveform of the eighth switching tube of the secondary three-phase full-bridge unit, between the driving waveform of the third switching tube of the primary three-phase full-bridge unit and the driving waveform of the ninth switching tube of the secondary three-phase full-bridge unit, between the driving waveform of the fourth switching tube of the primary three-phase full-bridge unit and the driving waveform of the tenth switching tube of the secondary three-phase full-bridge unit, between the driving waveform of the fifth switching tube of the primary three-phase full-bridge unit and the driving waveform of the eleventh switching tube of the secondary three-phase full-bridge unit, and between the driving waveform of the sixth switching tube of the primary three-phase full-bridge unit and the driving waveform of the twelfth switching tube of the secondary three-phase full-bridge unit.
Specifically, as shown in fig. 4, after the LLC secondary current flows through the body diode of the seventh switching tube, the seventh switching tube is driven to conduct after the second dead time Tdead2 elapses. The conduction modes of the eighth switching tube, the ninth switching tube, the tenth switching tube, the eleventh switching tube and the twelfth switching tube are the same as the conduction mode of the seventh switching tube, and are conducted after the second dead time Tdead2.
And S102, controlling the bidirectional three-level three-phase interleaved LLC converter to perform bidirectional charging and discharging work according to the set duty ratio.
Specifically, in the process of performing bidirectional charge and discharge operation by controlling the bidirectional three-level three-phase interleaved LLC converter with a set duty ratio, as shown in fig. 4, three-phase ripples of the corresponding dc capacitors (the capacitors on the first dc side) are Idc1, idc2, and Idc3, and are finally collected together on the dc side, that is, idc, after being filtered by the electrolytic capacitor (the capacitors on the second dc side), ripple pulsation of Idc is very small, the heat generation amount of the capacitor is reduced, and the service life is long. Because the three-phase LLC is adopted, the current stress born by each power device is very small, the power of the converter can be further improved, and the three-phase LLC converter is suitable for scenes with higher power.
In this embodiment, the setting manner of the duty ratios in the above steps is described by taking the first three-level three-phase interleaved LLC circuit 1 as an example to perform a charging process, that is, the first positive input terminal charges the second positive input terminal. Of course, the working principle of the second three-level three-phase interleaved LLC circuit 7 is the same as that of the first three-level three-phase interleaved LLC circuit 1. And the process that two-way three-level three-phase interleaved LLC converter first positive input end charges for second positive input end, and the process that second positive input end charges for first positive input end, theory of operation is the same, and DC BUS1 charges for DC BUS2 promptly, and when discharging and charging for DC BUS1 with DC BUS2, the theory of operation is similar.
In this embodiment, a plurality of three-level three-phase interleaved LLC circuits are connected in parallel, and the duty ratios of the switching tubes of different bridge arms in the primary three-phase full bridge unit of each three-level three-phase interleaved LLC circuit are controlled to be different by 120 °, and a first dead time Tdead1 is provided between the duty ratios of the switching tubes of the same bridge arm, and a second dead time Tdead2 is provided between the duty ratios of the switching tubes of the primary three-phase full bridge unit and the secondary three-phase full bridge unit, so as to control the bidirectional three-level three-phase interleaved LLC converter to perform bidirectional operation. Therefore, the three-phase LLC is adopted, so that the current stress of each semiconductor device is reduced, and the power level of the converter can be further improved; because the ripple current of the capacitor at the input side and the output side can be reduced due to three-phase interleaving (the interleaving is 120 degrees), the heat productivity of the capacitor can be reduced, the capacitance value at the direct current side is very small, the number of the capacitors is reduced, the volume of the capacitors is also reduced, the service life of the capacitors is prolonged, and the reliability is enhanced; the voltage stress of the converter can be improved by adopting three levels, and the converter can use a semiconductor device with low withstand voltage, so that the cost is reduced; due to the adoption of the bidirectional topology, the converter can be suitable for scenes in which power needs to flow bidirectionally, such as energy storage, battery charging and discharging and the like, and has wider application range. Therefore, the embodiment of the invention has the advantages of wide application range, low cost and strong voltage stress.
The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A bidirectional three-level three-phase interleaved LLC converter, comprising: a plurality of three-level three-phase interleaved LLC circuits in parallel, each said three-level three-phase interleaved LLC circuit comprising: the device comprises a primary side circuit, an LLC resonant circuit, an isolation transformation circuit and a secondary side circuit;
the primary side circuit, the LLC resonant circuit, the isolation transformation circuit and the secondary side circuit are electrically connected in sequence;
the primary circuit includes the crisscross former limit three-phase full-bridge unit of three-phase, LLC resonant circuit includes the three-phase resonance unit, keep apart the vary voltage circuit include with the three transformer that the three-phase resonance unit corresponds the connection, vice limit circuit includes the vice limit three-phase full-bridge unit of three-phase, the first bridge arm mid point of former limit three-phase full-bridge unit the second bridge arm mid point of former limit three-phase full-bridge unit and the third bridge arm mid point of former limit three-phase full-bridge unit correspond with the three-phase resonance unit electricity is connected, the first bridge arm mid point of vice limit three-phase full-bridge unit the second bridge arm mid point of vice limit three-phase full-bridge unit the third bridge arm mid point one-to-point of vice limit three-phase full-bridge unit with the vice limit electricity of three transformer is connected.
2. The bidirectional three-level three-phase interleaved LLC converter as claimed in claim 1, wherein said primary side circuit further comprises a first positive input terminal, a first N terminal, and a first DC side capacitor, a first terminal of said first DC side capacitor being electrically connected to said first positive input terminal, a second terminal of said first DC side capacitor being electrically connected to said first N terminal.
3. The bidirectional three-level three-phase interleaved LLC converter as claimed in claim 2, wherein said primary three-phase full bridge unit includes a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube;
the source electrode of the first switching tube is electrically connected with the drain electrode of the second switching tube to form a first bridge arm of the primary side three-phase full-bridge unit;
the source electrode of the third switching tube is electrically connected with the drain electrode of the fourth switching tube to form a second bridge arm of the primary three-phase full-bridge unit;
the source electrode of the fifth switching tube is electrically connected with the drain electrode of the sixth switching tube to form a third bridge arm of the primary three-phase full-bridge unit;
the first direct current side capacitor, the first bridge arm of the primary side three-phase full-bridge unit, the second bridge arm of the primary side three-phase full-bridge unit and the third bridge arm of the primary side three-phase full-bridge unit are connected in parallel; wherein, the first and the second end of the pipe are connected with each other,
the first end of the first direct current side capacitor is electrically connected with the drain electrode of the first switch tube, the drain electrode of the third switch tube and the drain electrode of the fifth switch tube, and the second end of the first direct current side capacitor is electrically connected with the source electrode of the second switch tube, the source electrode of the fourth switch tube and the source electrode of the sixth switch tube.
4. The bidirectional three-level three-phase interleaved LLC converter of claim 1, wherein said three-phase resonant unit comprises an A-phase resonant unit, a B-phase resonant unit, and a C-phase resonant unit; wherein, the first and the second end of the pipe are connected with each other,
the A-phase resonance unit comprises a first resonance capacitor and a first resonance inductor, one end of the first resonance capacitor is electrically connected with the midpoint of a first bridge arm of the primary three-phase full-bridge unit, the other end of the first resonance capacitor is electrically connected with one end of the first resonance inductor, and the other end of the first resonance inductor is electrically connected with the first end of the primary side of the corresponding A-phase transformer;
the B-phase resonance unit comprises a second resonance capacitor and a second resonance inductor, one end of the second resonance capacitor is electrically connected with the midpoint of a second bridge arm of the primary side three-phase full-bridge unit, the other end of the second resonance capacitor is electrically connected with one end of the second resonance inductor, and the other end of the second resonance inductor is electrically connected with the first end of the primary side of the corresponding B-phase transformer;
the C-phase resonance unit comprises a third resonance capacitor and a third resonance inductor, one end of the third resonance capacitor is electrically connected with the middle point of a third bridge arm of the primary side three-phase full-bridge unit, the other end of the third resonance capacitor is electrically connected with one end of the third resonance inductor, and the other end of the third resonance inductor is electrically connected with the first end of the primary side of the corresponding C-phase transformer;
and the second end of the primary side of the phase-A transformer is electrically connected with the second end of the primary side of the phase-B transformer and the second end of the primary side of the phase-C transformer respectively.
5. The bidirectional three-level three-phase interleaved LLC converter as claimed in claim 1, wherein said secondary side circuit further comprises a second positive input terminal, a second N terminal, and a second dc-side capacitor, a first terminal of said second dc-side capacitor being electrically connected to said second positive input terminal, and a second terminal of said second dc-side capacitor being electrically connected to said second N terminal.
6. The bidirectional three-level three-phase interleaved LLC converter as claimed in claim 5, wherein said secondary side three-phase full bridge unit includes a seventh switching tube, an eighth switching tube, a ninth switching tube, a tenth switching tube, an eleventh switching tube and a twelfth switching tube;
a source electrode of the seventh switching tube is electrically connected with a drain electrode of the eighth switching tube to form a first bridge arm of the secondary three-phase full-bridge unit;
the source electrode of the ninth switching tube is electrically connected with the drain electrode of the tenth switching tube to form a second bridge arm of the secondary side three-phase full-bridge unit;
a source electrode of the eleventh switching tube is electrically connected with a drain electrode of the twelfth switching tube to form a third bridge arm of the secondary side three-phase full-bridge unit;
the second direct-current side capacitor, the first bridge arm of the secondary three-phase full-bridge unit, the second bridge arm of the secondary three-phase full-bridge unit and the third bridge arm of the secondary three-phase full-bridge unit are connected in parallel; wherein, the first and the second end of the pipe are connected with each other,
a first end of the second direct-current side capacitor is electrically connected with a drain electrode of the seventh switching tube, a drain electrode of the ninth switching tube and a drain electrode of the eleventh switching tube, and a second end of the second direct-current side capacitor is electrically connected with a source electrode of the eighth switching tube, a source electrode of the tenth switching tube and a source electrode of the twelfth switching tube.
7. A bidirectional three-level three-phase interleaved LLC converter as claimed in any one of claims 1 to 6 further comprising a current transformer circuit, said current transformer circuit being disposed between said isolation transformation circuit and said secondary side circuit.
8. A bidirectional three-level three-phase interleaved LLC converter according to claim 7, wherein said current transformer circuit comprises an A-phase current transformer, a B-phase current transformer and a C-phase current transformer;
the phase A current transformer is connected between the first end of the secondary side of the phase A transformer and the midpoint of a first bridge arm of the secondary side three-phase full-bridge unit;
the phase B current transformer is connected between the first end of the secondary side of the phase B transformer and the midpoint of a second bridge arm of the secondary side three-phase full-bridge unit;
the C-phase current transformer is connected between the first end of the secondary side of the C-phase transformer and the midpoint of the third bridge arm of the secondary side three-phase full-bridge unit;
and the second end of the secondary side of the phase A transformer is electrically connected with the second end of the secondary side of the phase B transformer and the second end of the secondary side of the phase C transformer respectively.
9. A control method for a bidirectional three-level three-phase interleaved LLC converter according to any of claims 1 to 8, characterized by the steps of:
setting duty ratios of switching tubes of a primary side three-phase full-bridge unit and switching tubes of a secondary side three-phase full-bridge unit in the three-level three-phase interleaved LLC circuits, wherein the duty ratios of the switching tubes of different bridge arms of the primary side three-phase full-bridge unit are different from each other by 120 degrees, the switching tubes of the same bridge arm are complementary in opposite phase and are provided with first dead time, and second dead time is arranged between the duty ratios of the switching tubes of the primary side three-phase full-bridge unit and the switching tubes of the secondary side three-phase full-bridge unit;
and controlling the bidirectional three-level three-phase interleaved LLC converter to perform bidirectional charging and discharging work according to the set duty ratio.
10. The control method according to claim 9, wherein the step of setting the duty ratios of the switching tubes of the primary three-phase full-bridge unit and the switching tubes of the secondary three-phase full-bridge unit in the plurality of three-level three-phase interleaved LLC circuits comprises:
setting the driving waveform of the first switching tube of the primary side three-phase full-bridge unit to be 120 degrees ahead of the driving waveform of the third switching tube, and setting the driving waveform of the third switching tube to be 120 degrees ahead of the driving waveform of the fifth switching tube;
setting the reverse complementary conduction of the driving waveforms of the switching tubes of the same bridge arm of the primary side three-phase full-bridge unit, wherein the driving waveform of the second switching tube and the driving waveform of the first switch are set in reverse complementary conduction, the driving waveform of the fourth switching tube and the third switching tube are set in reverse complementary conduction, and the driving waveform of the sixth switching tube and the fifth switching tube are set in reverse complementary conduction;
setting first dead time between switching tubes of the same bridge arm of the primary side three-phase full-bridge unit, wherein the first dead time is respectively set between a driving waveform of the first switching tube and a driving waveform of the second switching tube, between a driving waveform of the third switching tube and a driving waveform of the fourth switching tube, and between a driving waveform of the fifth switching tube and a driving waveform of the sixth switching tube;
set up second dead time between the switch tube of former limit three-phase full-bridge unit and the switch tube of vice limit three-phase full-bridge unit, wherein, be provided with second dead time respectively between the drive waveform of the first switch tube of former limit three-phase full-bridge unit and between the drive waveform of the seventh switch tube of vice limit three-phase full-bridge unit, between the drive waveform of the third switch tube of former limit three-phase full-bridge unit and the drive waveform of the ninth switch tube of vice limit three-phase full-bridge unit, between the drive waveform of the fourth switch tube of former limit three-phase full-bridge unit and the drive waveform of the tenth switch tube of vice limit three-phase full-bridge unit, between the drive waveform of the fifth switch tube of former limit three-phase full-bridge unit and the drive waveform of the eleventh switch tube of vice limit three-phase full-bridge unit, and between the drive waveform of the sixth switch tube of former limit three-phase full-bridge unit and the drive waveform of the twelfth switch tube of vice limit three-phase full-bridge unit.
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