CN112350569B - Isolated resonant switch capacitor converter - Google Patents
Isolated resonant switch capacitor converter Download PDFInfo
- Publication number
- CN112350569B CN112350569B CN202011046740.0A CN202011046740A CN112350569B CN 112350569 B CN112350569 B CN 112350569B CN 202011046740 A CN202011046740 A CN 202011046740A CN 112350569 B CN112350569 B CN 112350569B
- Authority
- CN
- China
- Prior art keywords
- capacitor
- terminal
- switch
- switching tube
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to an isolated resonant switched capacitor converter, comprising: the input direct current capacitor group is formed by connecting input direct current capacitors C1-Cn in series from top to bottom, in the input direct current capacitor group, a positive connecting terminal ui1 and a negative connecting terminal ui2 are sequentially led out from the positive pole and the negative pole of an input direct current capacitor Ci, and i is more than or equal to 1 and less than or equal to n; the resonance switch capacitor units RSCU 1-RSCUn-1 are connected with the input direct current capacitor; the rectifying units REC1 to RECn-2 are connected with the resonant switch capacitor unit; the rectifying units REC1 to RECn-2 correspond to the output ports UO1 to UO (n-2). The invention has the advantages of easy structure expansion, simple control mode and realization of voltage balance of the input direct current capacitor without additional voltage-sharing control; the transformer realizes the electrical isolation function between the input side and the output side, and reduces the fault protection difficulty; the modular structure reduces the voltage stress of the switch device, and is suitable for occasions of high-voltage transformation.
Description
Technical Field
The invention relates to an isolated multilevel DC converter, in particular to an isolated resonant switched capacitor converter.
Background
With the development of power semiconductor devices, technical and economic advantages of direct current power supply are gradually reflected, and compared with an alternating current power supply technology, the direct current power supply technology has the advantages of low line cost, high power transmission efficiency, power transmission corridor saving, high reliability and the like.
The direct-current transformer is used as a key link in a direct-current power grid, and can realize the conversion of different voltage grades in the direct-current power grid. In a dc network, the voltage is usually higher and the power is also larger. The main technologies adopted in high-voltage and high-power occasions at present are switching device series-parallel connection, module combined direct-current converters and modular multilevel converters.
The switching device series-parallel technology can reduce the voltage and current of the switching device, but because the parameters of the switching device are difficult to be completely consistent, the dynamic and static responses of the switch are inconsistent, and therefore additional static and dynamic voltage sharing or current sharing control is needed, the method increases the control complexity of the system, reduces the running reliability of the system, and becomes a main reason for limiting the application of the switching device series-parallel technology in high-voltage and high-power occasions.
The module combined DC converter can meet different voltage and power requirements by combining a plurality of DC modules in series and parallel; the mode of connecting a plurality of direct current modules in series is adopted, so that the voltage stress of a switching device can be reduced, and the method is suitable for high-voltage occasions; the mode of connecting a plurality of direct current modules in parallel is adopted, so that the current stress of the switching device can be reduced, and the method is suitable for high-power occasions. In practical application, however, in order to realize voltage sharing between serial ports and current sharing between parallel ports, a complex voltage sharing and current sharing control strategy needs to be adopted, a large number of switching devices and driving circuits are required, and the size of the converter is large.
The modular multilevel converter inherits the advantages of the multilevel DC converter, has highly modular structure, can realize redundant control, and is suitable for high-voltage and high-power occasions. However, the topology needs a large number of half-bridge or full-bridge sub-modules, the number of conversion links is large, the size of the device is large, and the control is complex.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an isolated resonant switched capacitor converter which is easy to expand in structure, simple in control mode and capable of realizing voltage balance of an input direct current capacitor without additional voltage-sharing control; the transformer realizes the electrical isolation function between the input side and the output side, and reduces the fault protection difficulty; the modular structure reduces the voltage stress of the switch device, and is suitable for occasions of high-voltage transformation.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
1. an isolated resonant switched capacitor converter, comprising:
the input direct current capacitor bank is formed by connecting input direct current capacitors C1 to Cn in series from top to bottom,
in the input direct-current capacitor group, a positive connecting terminal ui1 and a negative connecting terminal ui2 are sequentially led out from the positive pole and the negative pole of the input direct-current capacitor Ci, i is more than or equal to 1 and less than or equal to n, and i is an integer;
the resonance switch capacitor units RSCU 1-RSCUn-1 are connected with the input direct current capacitor;
rectifying units REC 1-RECn-2 connected with the resonant switch capacitor unit;
the rectifying units REC1 to RECn-2 correspond to the output ports UO1 to UO (n-2).
On the basis of the technical scheme, the resonant switch capacitor unit and the input direct current capacitor are connected in a specific mode as follows:
each resonant switch capacitor unit comprises a connecting terminal A1, a connecting terminal A2 and a connecting terminal A3;
j is more than or equal to 1 and less than or equal to n-1 for the jth resonance switch capacitor unit RSCUj, j is an integer,
the connection terminal A1 is connected with the positive connection terminal uj1 of the j input direct current capacitor Cj,
the connection terminal A2 is connected with the negative connection terminal uj2 of the j-th input direct current capacitor Cj,
the connection terminal A3 is connected with the negative connection terminal u (j +1)2 of the j +1 th input direct current capacitor C (j + 1).
On the basis of the technical scheme, the rectification unit and the resonant switch capacitor unit are connected in a specific mode:
each resonant switch capacitor unit comprises a connecting terminal A4 and a connecting terminal A5;
each rectifying unit comprises a connecting terminal B1 and a connecting terminal B2;
j is more than or equal to 1 and less than or equal to n-1 for the jth resonance switch capacitor unit RSCUj, j is an integer,
the connection terminal A4 is connected with the connection terminal B2 of the j-1 rectifier unit RECj-1,
a connection terminal A5 is connected with a connection terminal B1 of a jth rectifying unit RECj;
wherein:
a wiring terminal A4 of the 1 st resonant switched capacitor unit RSCU1 has no external unit, and a wiring terminal A5 of the n-1 st resonant switched capacitor unit RSCUn-1 has no external unit.
On the basis of the technical scheme, the resonant switched capacitor units RSCU 1-RSCUn-1 are divided into two groups, wherein:
the number j is 2m-1, m is more than or equal to 1 and less than or equal to n/2, m is an integer,
the number j is 2m and is a second group;
each group comprising:
4 full-control type switching elements are respectively: a1 st switch tube Sxj1, a2 nd switch tube Sxj2, a3 rd switch tube Sxj3 and a4 th switch tube Sxj 4;
the resonant switch capacitor branch circuit is formed by a resonant inductor Lxscj and a switch capacitor Cxscj which are connected in series;
x is the group number of the resonant switch capacitor unit, and x is o when j is 2m-1, and x is e when j is 2 m.
On the basis of the technical scheme, the wiring mode of the first group of resonant switched capacitor units is as follows:
the 1 st switching tube Soj1 is connected in series with the 2 nd switching tube Soj2,
the 2 nd switching tube Soj2 is connected in series with the 3 rd switching tube Soj3,
the 3 rd switching tube Soj3 is connected in series with the 4 th switching tube Soj 4;
the terminal a1 is led out from the terminal a of the 1 st switch tube Soj1,
the b terminal of the 2 nd switching tube Soj2 leads out a connection terminal A2,
the b terminal of the 4 th switching tube Soj4 leads out a connection terminal A3,
the b terminal of the 1 st switching tube Soj1 leads out a connection terminal A4,
a b-end lead-out wiring terminal A5 of the 3 rd switch tube Soj 3;
the resonant inductor Loscj is connected to the terminal b of the 1 st switching tube Soj1,
the switch capacitor Coscj is connected with the terminal b of the 3 rd switch tube Soj 3;
the wiring mode of the second group of resonant switched capacitor units is as follows:
the 4 th switching tube Sej4 is connected in series with the 3 rd switching tube Sej3,
the 3 rd switching tube Sej3 is connected in series with the 2 nd switching tube Sej2,
the 2 nd switching tube Sej2 is connected in series with the 1 st switching tube Sej 1;
the terminal a1 is led out from the terminal a of the 4 th switching tube Sej4,
the b terminal of the 3 rd switching tube Sej3 leads out a connection terminal A2,
the b terminal of the 1 st switching tube Sej1 leads out a connection terminal A3,
the b end of the 4 th switching tube Sej4 leads out a terminal A4,
a b-end lead-out wiring terminal A5 of the 2 nd switch tube Sej 2;
the resonant inductor Lescj is connected to terminal b of the 4 th switching tube Sej4,
the switch capacitor Cescj is connected to the terminal b of the 2 nd switch Sej 2.
On the basis of the technical scheme, energy is circularly transferred through the work of the resonant switch capacitor unit, so that the self-balance of the input direct current capacitor voltage is realized.
On the basis of the technical scheme, after the input direct-current capacitor bank is replaced by the series battery bank, the isolated resonant switched capacitor converter is used for energy management of the battery bank;
and after the input direct-current capacitor bank is replaced by the super capacitor, the isolated resonant switch capacitor converter is used for energy management of the super capacitor.
On the basis of the technical scheme, according to the difference of the form of the transformer in the rectifying unit and the selection of the switch in the rectifying unit, the rectifying unit specifically comprises the following 5 basic types:
the rectifying unit with a full-wave uncontrolled rectifying structure or the rectifying unit with a full-bridge uncontrolled rectifying structure is used in occasions without energy bidirectional flow;
the full-wave full-control rectification unit or the full-bridge full-control rectification unit is used for occasions requiring bidirectional energy flow;
and the rectifying unit adopting a secondary side phase-shifting rectifying structure is used for realizing zero-voltage soft switching.
The isolated resonant switched capacitor converter has the following beneficial effects:
1. the converter has the advantages that automatic voltage sharing among input direct-current capacitors is realized, the work of each resonant switch capacitor unit is not influenced mutually and is independent, the structure is easy to expand, the control mode is simple, and the like.
2. The method can be widely applied to direct-current power transmission and distribution systems, rail transit traction power supply systems, rail transit auxiliary power supply systems and direct-current voltage conversion occasions.
Drawings
The invention has the following drawings:
the drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:
fig. 1 is a schematic structural diagram of an isolated resonant switched capacitor converter according to the present invention;
FIG. 2 is a fully controlled device type;
fig. 2(a) is an insulated gate field effect transistor (MOSFET), fig. 2(b) is an Insulated Gate Bipolar Transistor (IGBT), and fig. 2(c) is gallium nitride (GaN);
FIG. 3(a) is a full-wave uncontrolled rectifying unit structure;
FIG. 3(b) is a full-bridge uncontrolled rectifying unit structure;
FIG. 3(c) is a structure of a secondary side phase-shifting rectifying unit;
FIG. 3(d) is a full-wave fully-controlled rectifying unit structure;
FIG. 3(e) is a full-bridge full-control rectification unit structure;
FIG. 4 is a schematic diagram of a four-level bidirectional DC converter;
fig. 5 is a waveform diagram of key control waveforms of the isolated resonant switched capacitor converter.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings. The detailed description, while indicating exemplary embodiments of the invention, is given by way of illustration only, in which various details of embodiments of the invention are included to assist understanding. Accordingly, it will be appreciated by those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
As shown in fig. 1, the isolated resonant switched capacitor converter according to the present invention includes:
the input direct current capacitor group is formed by connecting n input direct current capacitors C1 to Cn in series from top to bottom, n is more than or equal to 3 and less than or equal to 500, n is an integer,
in the input direct-current capacitor group, a positive connecting terminal ui1 and a negative connecting terminal ui2 are sequentially led out from the positive pole and the negative pole of the input direct-current capacitor Ci, i is more than or equal to 1 and less than or equal to n, and i is an integer;
n-1 resonance switch capacitor units RSCU 1-RSCUn-1 connected with the input direct current capacitor;
n-2 rectifying units REC 1-RECn-2 connected with the resonant switched capacitor unit;
the rectifying units REC1 to RECn-2 correspond to the output ports UO1 to UO (n-2).
On the basis of the technical scheme, the resonant switch capacitor unit and the input direct current capacitor are connected in a specific mode as follows:
each resonant switch capacitor unit comprises a connecting terminal A1, a connecting terminal A2 and a connecting terminal A3;
j is more than or equal to 1 and less than or equal to n-1 for the jth resonance switch capacitor unit RSCUj, j is an integer,
the connection terminal A1 is connected with the positive connection terminal uj1 of the j input direct current capacitor Cj,
the connection terminal A2 is connected with the negative connection terminal uj2 of the j-th input direct current capacitor Cj,
the connection terminal A3 is connected with the negative connection terminal u (j +1)2 of the j +1 th input DC capacitor C (j + 1).
On the basis of the technical scheme, the rectification unit and the resonant switch capacitor unit are connected in a specific mode:
each resonant switch capacitor unit comprises a connecting terminal A4 and a connecting terminal A5;
each rectifying unit comprises a connecting terminal B1 and a connecting terminal B2;
j is more than or equal to 1 and less than or equal to n-1 for the jth resonance switch capacitor unit RSCUj, j is an integer,
the connection terminal A4 is connected with the connection terminal B2 of the j-1 rectifier unit RECj-1,
a connection terminal A5 is connected with a connection terminal B1 of a jth rectifying unit RECj;
wherein:
a wiring terminal A4 of the 1 st resonant switched capacitor unit RSCU1 has no external unit, and a wiring terminal A5 of the n-1 st resonant switched capacitor unit RSCUn-1 has no external unit.
On the basis of the technical scheme, the resonant switched capacitor units RSCU 1-RSCUn-1 are divided into two groups, wherein:
the number j is 2m-1, m is more than or equal to 1 and less than or equal to n/2, m is an integer,
the number j is 2m and is a second group;
each group comprising:
4 full-control type switching elements are respectively: a1 st switch tube Sxj1, a2 nd switch tube Sxj2, a3 rd switch tube Sxj3 and a4 th switch tube Sxj 4;
the resonant switch capacitor branch circuit is formed by a resonant inductor Lxscj and a switch capacitor Cxscj which are connected in series;
x is the group number of the resonant switch capacitor unit, x is o when j is 2m-1, and x is e when j is 2 m; the wiring mode of the first group of resonant switched capacitor units is as follows:
the 1 st switching tube Soj1 is connected in series with the 2 nd switching tube Soj2, the 2 nd switching tube Soj2 is connected in series with the 3 rd switching tube Soj3, and the 3 rd switching tube Soj3 is connected in series with the 4 th switching tube Soj 4;
the terminal a1 is led out from the terminal a of the 1 st switch tube Soj1,
the b terminal of the 2 nd switching tube Soj2 leads out a connection terminal A2,
the b terminal of the 4 th switching tube Soj4 leads out a connection terminal A3,
the b terminal of the 1 st switching tube Soj1 leads out a connection terminal A4,
a b-end lead-out wiring terminal A5 of the 3 rd switch tube Soj 3;
the resonant inductor Loscj is connected with the end b of the 1 st switch tube Soj1, and the switch capacitor Coscj is connected with the end b of the 3 rd switch tube Soj 3;
the wiring mode of the second group of resonant switched capacitor units is as follows:
the 4 th switching tube Sej4 is connected in series with the 3 rd switching tube Sej3, the 3 rd switching tube Sej3 is connected in series with the 2 nd switching tube Sej2, and the 2 nd switching tube Sej2 is connected in series with the 1 st switching tube Sej 1;
the terminal a1 is led out from the terminal a of the 4 th switching tube Sej4,
the b terminal of the 3 rd switching tube Sej3 leads out a connection terminal A2,
the b terminal of the 1 st switching tube Sej1 leads out a connection terminal A3,
the b terminal of the 4 th switching tube Sej4 leads out a connection terminal A4,
a b-end lead-out wiring terminal A5 of the 2 nd switch tube Sej 2;
the resonant inductor Lescj is connected to terminal b of the 4 th switching tube Sej4,
the switch capacitor Cescj is connected to the terminal b of the 2 nd switch Sej 2.
The voltage-sharing principle of the isolated resonant switched capacitor converter is as follows: energy is circularly transferred through the work of the resonant switch capacitor unit, so that the self-balance of the input direct current capacitor voltage is realized.
On the basis of the technical scheme, after the series battery pack is used for replacing the input direct-current capacitor pack, the isolation type resonant switch capacitor converter is used for energy management of the battery pack.
On the basis of the technical scheme, after the input direct-current capacitor bank is replaced by the super capacitor, the isolated resonant switched capacitor converter is used for energy management of the super capacitor.
On the basis of the above technical solution, the fully-controlled device is an insulated gate field effect transistor (MOSFET), an Insulated Gate Bipolar Transistor (IGBT), or a gallium nitride (GaN) device, as shown in fig. 2(a) -2 (c);
according to the difference of the transformer form in the rectifying unit and the switch selection type in the rectifying unit, the rectifying unit specifically comprises the following 5 basic types:
the rectifying unit with a full-wave uncontrolled rectifying structure or the rectifying unit with a full-bridge uncontrolled rectifying structure is used in occasions without energy bidirectional flow;
fig. 3(a) shows a full-wave uncontrolled rectifying structure, where Lk is a leakage inductance of a transformer, the transformer includes a primary winding and a secondary winding, the secondary winding of the transformer has a center tap, a dotted terminal t1 of the primary winding of the transformer is connected to the leakage inductance Lk, the other terminal of the leakage inductance Lk is connected to a1 st connection terminal B1 of the rectifying unit, and a dotted terminal t2 of the primary winding of the transformer is connected to a2 nd connection terminal B2 of the rectifying unit. The rectifying circuit is provided with 2 rectifying diodes in total and comprises a1 st rectifying diode D1 and a2 nd rectifying diode D2, wherein the anode of D1 is connected with the homonymous terminal t3 of the secondary winding of the transformer, the cathode of D1 is connected with the output smoothing current Lf, the other end of Lf is connected with a1 st output terminal O1 of the rectifying unit, the anode of D2 is connected with the heteronymous terminal t5 of the secondary winding of the transformer, the cathode of D2 is connected with the cathode of D1 and the output smoothing current Lf, and the center tap t4 of the secondary winding of the transformer is connected with a2 nd output terminal O2 of the rectifying unit;
as shown in fig. 3(B), the full-bridge uncontrolled rectifying structure is shown, where Lk is a leakage inductance of the transformer, the transformer includes a primary winding and a secondary winding, a dotted terminal t1 of the primary winding of the transformer is connected to the leakage inductance Lk, the other terminal of the leakage inductance Lk is connected to a1 st connection terminal B1 of the rectifying unit, and a dotted terminal t2 of the primary winding of the transformer is connected to a2 nd connection terminal B2 of the rectifying unit. The rectifying circuits have 2 rectifying bridge arms in total, a first rectifying bridge arm (D1, D2) and a second rectifying bridge arm (D3, D4), wherein the cathode of an upper tube D1 of the first rectifying bridge arm (D1, D2) is connected with the cathode of an upper tube D3 of the second rectifying bridge arm (D3, D4) and an output filter current Lf, the other end of the output filter current Lf is connected with a first output end O1 of a rectifying unit, the anode of a lower tube D2 of the first rectifying bridge arm (D1, D2) is connected with the anode of a lower tube D4 of the second rectifying bridge arm (D3, D4), a second output end O2 of the rectifying unit is led out together, a homonymous winding end t3 of a transformer is connected with the midpoint of the first rectifying bridge arm (D1, D2), and a heteronymous winding end t4 of the transformer is connected with the midpoint of the second rectifying bridge arm (D3, D4);
a rectifying unit adopting a secondary side phase-shifting rectifying structure is used for realizing zero-voltage soft switching; namely: two diodes in the full-bridge uncontrolled rectifying structure are replaced by rectifying units of fully-controlled devices, a group of control degrees of freedom is added, and zero-voltage soft switching is realized;
as shown in fig. 3(c), a secondary side phase-shifting rectification structure is obtained, in the full-bridge uncontrolled rectification structure, the first rectification bridge arm (D1, D2) and the second rectification bridge arm (D3, D4) are replaced by the first phase-shifting bridge arm (D1, Q2) and the second phase-shifting bridge arm (D3, Q4), wherein Q2 and Q4 are fully-controlled switching devices, and the direction of the switch antiparallel diode is consistent with that of the rectification diode, so that the structure can realize secondary side phase-shifting control, thereby realizing zero-voltage soft switching;
the full-wave full-control rectification unit or the full-bridge full-control rectification unit is used for occasions requiring bidirectional energy flow;
as shown in fig. 3(D), the full-wave fully-controlled rectifying structure can realize bidirectional energy flow by replacing D1 and D2 in the full-wave non-controlled rectifying structure with fully-controlled switching devices Q1 and Q2, and the direction of the anti-parallel diodes of the fully-wave non-controlled rectifying structure is consistent with that of the rectifying diodes;
as shown in fig. 3(e) which is a full-bridge full-control rectification structure, the first rectification bridge arm (D1, D2) and the second rectification bridge arm (D3, D4) in the full-bridge full-control rectification structure are replaced by the first switching bridge arm (Q1, Q2) and the second switching bridge arm (Q3, Q4), wherein Q1, Q2, Q3 and Q4 are all full-control switching devices, and the direction of the anti-parallel diodes of the full-bridge full-control rectification structure is consistent with that of the rectification diodes, so that the structure can realize bidirectional energy flow.
Fig. 4 shows an exemplary embodiment of a structure diagram of a four-level bidirectional dc converter implemented by using the scheme of the present invention, which includes:
3 input DC capacitors, a first input DC capacitor C1, a second input DC capacitor C2, a third input DC capacitor C3,
2 resonant switched capacitor units, a first resonant switched capacitor unit RSCU1, a second resonant switched capacitor unit RSCU2,
1 rectifying unit, a first rectifying unit REC 1.
The four-level bidirectional direct current converter utilizes the resonant switch capacitor unit to realize 3 times of voltage sharing and output voltage regulation of the input direct current capacitor, and the rectifying unit adopts a full-bridge full-control rectifying structure to realize energy bidirectional transfer.
Fig. 5 shows a key control waveform of the isolated resonant switched capacitor converter shown in fig. 1, where Ts is a switching period, Tp is a phase shift time between Soj3 and Sej3, udsoj1, udsoj2, udsoj3 and udsoj4 are voltages of Soj1, Soj2, Soj3 and Soj4, udsej1, udsej2, udsej3 and udsej4 are voltages of Sej1, Sej2, Sej3 and Sej4, iLk is a leakage current of a transformer in a jth rectifying unit, and all switching duty ratios are 50%, where Sxj1 and Sxj3, Sxj2 and Sxj4 are simultaneously turned on, and zero-voltage soft switching of an output voltage regulator and a primary side switch device can be realized by phase shift control.
Those not described in detail in this specification are within the skill of the art.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.
Claims (4)
1. An isolated resonant switched capacitor converter, comprising:
the input direct current capacitor bank is formed by connecting input direct current capacitors C1 to Cn in series from top to bottom,
in the input direct-current capacitor group, a positive connecting terminal ui1 and a negative connecting terminal ui2 are sequentially led out from the positive pole and the negative pole of the input direct-current capacitor Ci, i is more than or equal to 1 and less than or equal to n, and i is an integer;
the resonance switch capacitor units RSCU 1-RSCUn-1 are connected with the input direct current capacitor;
the resonant switched capacitor units RSCU1 to RSCUn-1 are divided into two groups, of which:
the number j is 2m-1, m is more than or equal to 1 and less than or equal to n/2, m is an integer,
the number j is 2m and is a second group;
each group comprising:
4 full-control type switching elements are respectively: a1 st switch tube Sxj1, a2 nd switch tube Sxj2, a3 rd switch tube Sxj3 and a4 th switch tube Sxj 4;
the resonant switch capacitor branch circuit is formed by a resonant inductor Lxscj and a switch capacitor Cxscj which are connected in series;
x is the group number of the resonant switch capacitor unit, x is o when j is 2m-1, and x is e when j is 2 m;
each resonant switch capacitor unit comprises a connecting terminal A1, a connecting terminal A2, a connecting terminal A3, a connecting terminal A4 and a connecting terminal A5;
the wiring mode of the first group of resonant switched capacitor units is as follows:
the 1 st switching tube Soj1 is connected in series with the 2 nd switching tube Soj2,
the 2 nd switching tube Soj2 is connected in series with the 3 rd switching tube Soj3,
the 3 rd switching tube Soj3 is connected in series with the 4 th switching tube Soj 4;
the terminal a1 is led out from the end a of the 1 st switch tube Soj1,
the b terminal of the 2 nd switching tube Soj2 leads out a connection terminal A2,
the b terminal of the 4 th switching tube Soj4 leads out a connection terminal A3,
the b terminal of the 1 st switching tube Soj1 leads out a connection terminal A4,
a b-end lead-out wiring terminal A5 of the 3 rd switch tube Soj 3;
the resonant inductor Loscj is connected to the terminal b of the 1 st switching tube Soj1,
the switch capacitor Coscj is connected with the terminal b of the 3 rd switch tube Soj 3;
the wiring mode of the second group of resonant switch capacitor units is as follows:
the 4 th switching tube Sej4 is connected in series with the 3 rd switching tube Sej3,
the 3 rd switching tube Sej3 is connected in series with the 2 nd switching tube Sej2,
the 2 nd switching tube Sej2 is connected in series with the 1 st switching tube Sej 1;
the terminal a1 is led out from the end a of the 4 th switching tube Sej4,
the b terminal of the 3 rd switching tube Sej3 leads out a connection terminal A2,
the b terminal of the 1 st switching tube Sej1 leads out a connection terminal A3,
the b terminal of the 4 th switching tube Sej4 leads out a connection terminal A4,
a b-end lead-out wiring terminal A5 of the 2 nd switch tube Sej 2;
the resonant inductor Lescj is connected to terminal b of the 4 th switching tube Sej4,
the switch capacitor Cescj is connected with the b end of the 2 nd switch tube Sej 2;
the rectifying units REC1 to RECn-2 are connected with the resonant switch capacitor unit; the concrete connection mode is as follows:
each rectifying unit comprises a connecting terminal B1 and a connecting terminal B2;
j is more than or equal to 1 and less than or equal to n-1 for the jth resonance switch capacitor unit RSCUj, j is an integer,
the connection terminal A4 is connected with the connection terminal B2 of the j-1 rectifier unit RECj-1,
a connection terminal A5 is connected with a connection terminal B1 of a jth rectifying unit RECj;
wherein:
the connection terminal a4 of the 1 st resonant switched capacitor unit RSCU1 has no external unit,
a connecting terminal A5 of the (n-1) th resonant switched capacitor unit RSCUn-1 is free of an external unit;
the rectifier units REC1 to RECn-2 correspond to the output ports UO1 to UO (n-2);
after the input direct-current capacitor bank is replaced by the series battery bank, the isolated resonant switch capacitor converter is used for energy management of the battery bank;
and after the input direct-current capacitor bank is replaced by the super capacitor, the isolated resonant switch capacitor converter is used for energy management of the super capacitor.
2. The isolated resonant switched capacitor converter of claim 1, wherein the resonant switched capacitor unit is connected to the input dc capacitor in the following manner:
j is more than or equal to 1 and less than or equal to n-1 for the jth resonance switch capacitor unit RSCUj, j is an integer,
the connection terminal A1 is connected with the positive connection terminal uj1 of the j input direct current capacitor Cj,
the connection terminal A2 is connected with the negative connection terminal uj2 of the j-th input direct current capacitor Cj,
the connection terminal A3 is connected with the negative connection terminal u (j +1)2 of the j +1 th input DC capacitor C (j + 1).
3. The isolated resonant switched capacitor converter of claim 1, wherein energy is cyclically transferred by operation of the resonant switched capacitor unit to achieve self-equalization of the input dc capacitor voltage.
4. The isolated resonant switched-capacitor converter according to claim 1, wherein the rectifying unit specifically includes the following 5 basic types according to the difference between the transformer type in the rectifying unit and the switch type selection in the rectifying unit:
the rectifying unit with a full-wave uncontrolled rectifying structure or the rectifying unit with a full-bridge uncontrolled rectifying structure is used in occasions without energy bidirectional flow;
the full-wave full-control rectification unit or the full-bridge full-control rectification unit is used for occasions requiring bidirectional energy flow;
and the rectifying unit adopting a secondary side phase-shifting rectifying structure is used for realizing zero-voltage soft switching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011046740.0A CN112350569B (en) | 2020-09-29 | 2020-09-29 | Isolated resonant switch capacitor converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011046740.0A CN112350569B (en) | 2020-09-29 | 2020-09-29 | Isolated resonant switch capacitor converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112350569A CN112350569A (en) | 2021-02-09 |
| CN112350569B true CN112350569B (en) | 2022-08-16 |
Family
ID=74361255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011046740.0A Active CN112350569B (en) | 2020-09-29 | 2020-09-29 | Isolated resonant switch capacitor converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112350569B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112510994B (en) * | 2020-10-22 | 2023-03-07 | 国网浙江省电力有限公司电力科学研究院 | Three-phase LLC resonant DC converter with multiple voltage reduction |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3761019B2 (en) * | 2000-02-23 | 2006-03-29 | 富士電機システムズ株式会社 | Inverter circuit |
| CN103296882B (en) * | 2013-05-29 | 2015-09-30 | 浙江大学 | A kind of DC-DC controlled resonant converter with automatically equalizing voltage function |
| CN104734483A (en) * | 2015-03-11 | 2015-06-24 | 北京交通大学 | DC bus capacitor voltage equalizing device |
| CN105006964B (en) * | 2015-07-02 | 2018-05-18 | 北京交通大学 | A kind of more electric mean pressure resonant zero Sofe Switch DC-DC converters |
| CN108964477A (en) * | 2018-09-19 | 2018-12-07 | 矽力杰半导体技术(杭州)有限公司 | Mode of resonance switch converters |
-
2020
- 2020-09-29 CN CN202011046740.0A patent/CN112350569B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112350569A (en) | 2021-02-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9502991B2 (en) | Hybrid converter and wind power generating system | |
| WO2017000532A1 (en) | Multi-level voltage-sharing resonant zero-current soft-switching dc-dc converter | |
| US20180351368A1 (en) | Electrical energy router and electrical energy router submodule | |
| CN107204626A (en) | A kind of LCC MMC interlock hybrid bypolar DC transmission system | |
| CN102222929A (en) | DC (Direct Current) power transmission system with function of unidirectionally transmitting power | |
| CN112868172B (en) | Three-level power conversion system and method | |
| CN108306324B (en) | Modularized centralized energy storage system | |
| CN209448659U (en) | A kind of more DC port inverters | |
| WO2020169018A1 (en) | Converter having multiple dc ports and control method | |
| Hu et al. | Fault-tolerant converter with a modular structure for HVDC power transmitting applications | |
| CN112953253A (en) | Unidirectional alternating current power electronic transformer topology and power balance control method thereof | |
| CN106505902B (en) | LCC/VSC direct current interconnects transformer | |
| Li et al. | A Topology-Reconfigurable Fault-Tolerant Two-and-Single Stage AC–DC Converter for High Reliability Applications | |
| CN112350569B (en) | Isolated resonant switch capacitor converter | |
| CN106887952A (en) | A kind of commutator transformer and its implementation that direct current network is accessed for new energy | |
| CN208690940U (en) | High-voltage direct-current transmission system | |
| CN116054585A (en) | Novel high-voltage direct-current transformer and control method | |
| CN108199602B (en) | Multi-winding time-sharing power supply forward direct current chopper type single-stage multi-input high-frequency chain inverter | |
| CN108306318B (en) | Symmetrical energy storage system based on modular multilevel converter | |
| CN111900886B (en) | Flexible direct current transmission converter | |
| CN211127568U (en) | DC-DC electric energy transmission system | |
| WO2021017887A1 (en) | Alternating current conversion device | |
| CN112350570B (en) | Self-voltage-sharing hybrid LLC direct-current converter | |
| CN111146932A (en) | DC-DC electric energy transmission system | |
| CN112994471B (en) | Power electronic transformer based on series full-bridge resonant circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |