CN110768531A - Bidirectional high-frequency isolation type DC/DC module - Google Patents
Bidirectional high-frequency isolation type DC/DC module Download PDFInfo
- Publication number
- CN110768531A CN110768531A CN201810843959.XA CN201810843959A CN110768531A CN 110768531 A CN110768531 A CN 110768531A CN 201810843959 A CN201810843959 A CN 201810843959A CN 110768531 A CN110768531 A CN 110768531A
- Authority
- CN
- China
- Prior art keywords
- bidirectional
- circuit
- bridge
- frequency
- full
- 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.)
- Pending
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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- 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 discloses a bidirectional high-frequency isolation type DC/DC module, which is used for realizing bidirectional transmission of electric quantity and is characterized by comprising the following components: a three-level buck-boost circuit; and the two bidirectional LLC full-bridge resonant conversion circuits are respectively connected with the three-level buck-boost circuit. The bidirectional high-frequency auxiliary converter system can be applied to a bidirectional high-frequency auxiliary converter system, and bidirectional transmission of electric quantity between the traction middle direct-current bus and the auxiliary middle direct-current bus is realized, so that bidirectional flow of energy of the converter system is realized, and the emergency traction requirement of a rail is met. The three-level buck-boost circuit can reduce the voltage and current stress of a chopper circuit and improve the working range of the circuit while realizing power bidirectional conversion; the bidirectional LLC full-bridge resonant conversion circuit can realize power bidirectional conversion and electrical isolation of input and output, and all switch tubes of the bidirectional LLC full-bridge resonant conversion circuit can realize zero-voltage switching-on when being used as chopper tubes and zero-current switching-off when being used as rectifier tubes, so that the conversion efficiency is improved.
Description
Technical Field
The invention relates to a vehicle-mounted power system, in particular to a wide-range bidirectional high-frequency isolation type DC/DC module capable of realizing bidirectional transmission of electric quantity between a traction intermediate direct current bus and an auxiliary intermediate direct current bus.
Background
With the generalization of high-speed rail of automobiles, rail transit has become a popular mode of transportation. The conventional rail transit vehicle-mounted auxiliary converter system has the problems of large volume, low power density and the like, energy of the conventional rail transit vehicle-mounted high-frequency auxiliary converter system can only be transmitted in a single direction, namely, the energy can only be charged for a storage battery and supplies power for an auxiliary load through a traction direct-current bus and the high-frequency auxiliary converter system, and the energy cannot flow reversely.
The existing high-frequency auxiliary converter system adopts the arrangement of a preceding stage chopping and LLC resonant converter to replace the traditional power frequency auxiliary converter system, thereby reducing the volume and weight of the system, improving the power density and realizing the requirement of light weight. However, the existing high-frequency auxiliary converter system can only realize unidirectional flow of energy, namely, the energy can only be charged for a storage battery and supplied for an auxiliary load through a traction direct-current bus by the high-frequency auxiliary converter system, and the energy cannot flow reversely. And the used low-voltage storage battery can only supply power for the control circuit and the auxiliary load due to the limitation of capacity and discharge rate, and cannot directly supply energy for the traction motor. If emergency power supply is to be provided for the traction motor when the pantograph is powered off, the following conditions need to be met: the emergency traction power is far larger than the normal power supply power, the emergency traction frequency is low, and the volume space of the train is limited, so the bidirectional converter system has high power density, and the existing vehicle-mounted auxiliary converter system cannot meet the requirements.
Therefore, a bidirectional high-frequency isolation type DC/DC module is needed to implement a vehicle-mounted bidirectional high-frequency auxiliary converter system with high power, high frequency, high power density, high efficiency and light weight.
Disclosure of Invention
The invention aims to solve the technical problem that the conventional vehicle-mounted auxiliary converter system cannot realize bidirectional energy transfer, so that emergency energy cannot be provided for a traction motor when a vehicle-mounted bow net is powered off.
In order to solve the above technical problem, the present invention provides a bidirectional high-frequency isolated DC/DC module for realizing bidirectional transmission of electric quantity, including:
a three-level buck-boost circuit;
and the two bidirectional LLC full-bridge resonant conversion circuits are respectively connected with the three-level buck-boost circuit.
Preferably, the three-level buck-boost circuit comprises a first voltage-equalizing unit, a buck-boost chopper unit and a filtering boost inductor which are connected in sequence.
Preferably, the buck-boost chopper unit comprises two half-bridge sub-units connected in series.
Preferably, the high-voltage side of the two bidirectional LLC full-bridge resonant conversion circuits is connected in series and the low-voltage side is connected in parallel.
Preferably, the bidirectional LLC full-bridge resonant conversion circuit includes a second voltage-equalizing unit, a first full-bridge unit, a voltage transformation unit, and a second full-bridge unit, which are connected in sequence.
Preferably, first full-bridge unit and second full-bridge unit structure are the same, just first full-bridge unit includes two parallel connection's half-bridge subunit, the half-bridge subunit includes the IGBT module, the IGBT module includes two series connection's IGBT chip.
Preferably, the voltage transformation unit comprises a high-frequency transformer and a resonant cavity;
the resonant cavity comprises a resonant inductor, a first resonant capacitor and a second resonant capacitor, the resonant inductor is connected in series with one end of the primary side of the high-frequency transformer, the first resonant capacitor is connected in series with the other end of the primary side of the high-frequency transformer, and the second resonant capacitor is connected in series with one end of the secondary side of the high-frequency transformer.
Preferably, the three-level up-down voltage circuit further comprises a pre-charging circuit connected to the three-level up-down voltage circuit, and the pre-charging circuit is configured to charge a voltage dividing capacitor.
Preferably, the device further comprises a filter circuit connected with the pre-charging circuit, wherein the filter circuit is used for filtering high-frequency noise in the circuit.
Preferably, the bidirectional LLC full-bridge resonant conversion circuit further includes a filter capacitor circuit connected to an output end of the bidirectional LLC full-bridge resonant conversion circuit, and the filter capacitor circuit is configured to filter the dc voltage.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
by applying the bidirectional high-frequency isolated DC/DC module provided by the embodiment of the invention, bidirectional conversion of power can be realized within a wide input and output range, and bidirectional transmission of electric quantity is realized mainly through the three-level buck-boost circuit and the two bidirectional LLC full-bridge resonant conversion circuits. The method can be applied to a bidirectional high-frequency auxiliary converter system and is used for realizing bidirectional transmission of electric quantity between the traction middle direct current bus and the auxiliary middle direct current bus, so that bidirectional flow of energy of the converter system is realized, and the emergency traction requirement of the rail is met; meanwhile, a multi-level technology, a phase-staggered control technology and a soft switching technology are adopted to further improve the working frequency of the bidirectional converter, reduce the volume and weight of the module and improve the power density of the module. Specifically, the three-level buck-boost circuit can reduce the voltage and current stress of a chopper circuit and improve the working range of the circuit while realizing power bidirectional conversion; the bidirectional LLC full-bridge resonant conversion circuit can realize power bidirectional conversion and electrical isolation of input and output, and all switch tubes of the bidirectional LLC full-bridge resonant conversion circuit can realize zero-voltage switching-on when being used as chopper tubes and zero-current switching-off when being used as rectifier tubes, so that the conversion efficiency is improved. The method and the device adopt a multi-level technology, a multi-circuit technology and a soft switching technology to further improve the working frequency of the bidirectional converter, reduce the volume of a system and improve the power density of the system.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a bidirectional high-frequency isolation type DC/DC module according to an embodiment of the invention;
fig. 2 shows an implementation circuit diagram of the bidirectional high-frequency isolated DC/DC module according to the embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
The conventional vehicle-mounted high-frequency auxiliary converter system for rail transit generally can only realize unidirectional flow of energy, namely the energy can only be used for charging a storage battery and supplying power to an auxiliary load through a traction direct-current bus and the high-frequency auxiliary converter system, and the energy cannot flow reversely. And the used low-voltage storage battery can only supply power for the control circuit and the auxiliary load due to the limitation of capacity and discharge rate, and cannot directly supply energy for the traction motor. If emergency power supply is required to be provided for a traction motor when a pantograph is powered off, the emergency traction power is far higher than the normal power supply power, the emergency traction frequency is low, and the volume space of a train is limited, so that a bidirectional converter system has high power density, and a bidirectional high-frequency isolation type DC/DC module capable of realizing bidirectional flow of a vehicle-mounted auxiliary converter system is not available at present.
In order to solve the technical problems in the prior art, an embodiment of the present invention provides a bidirectional high-frequency isolated DC/DC module.
FIG. 1 is a schematic structural diagram of a bidirectional high-frequency isolated DC/DC module according to an embodiment of the present invention; referring to fig. 1, the bidirectional high-frequency isolated DC/DC module of this embodiment includes a three-level buck-boost circuit and two bidirectional LLC full-bridge resonant conversion circuits, the three-level buck-boost circuit is connected with the two bidirectional LLC full-bridge resonant conversion circuits respectively, the two bidirectional LLC full-bridge resonant conversion circuits have their high-voltage sides connected in series and their low-voltage sides connected in parallel, and the three-level buck-boost circuit is connected with the two bidirectional LLC full-bridge resonant conversion circuits. The bidirectional high-frequency isolated DC/DC module is used for realizing bidirectional transmission of electric quantity, and can be applied to a vehicle-mounted bidirectional high-frequency auxiliary converter system to realize bidirectional transmission of electric quantity between a traction middle direct-current bus and an auxiliary middle direct-current bus, so that bidirectional transmission of electric quantity between the traction middle direct-current bus and a power storage battery is realized.
Fig. 2 shows an implementation circuit diagram of the bidirectional high-frequency isolated DC/DC module according to the embodiment of the present invention. Referring to fig. 2, the three-level buck-boost circuit comprises a first voltage-sharing unit, a buck-boost chopper unit and a filter boost inductor L2 which are connected in sequence, and is used for realizing power bidirectional conversion, reducing voltage and current stress of the chopper circuit and improving the working range of the circuit. Specifically, the first voltage equalizing unit is used for averaging voltages at two ends of the buck-boost chopper unit, and specifically includes a capacitor C1 and a capacitor C2 connected in series between the positive electrode and the negative electrode of the traction intermediate dc bus, and a resistor R1 and a resistor R2 connected in parallel to two ends of the capacitor C1 and the capacitor C2, respectively. The buck-boost chopper unit is used for realizing bidirectional power conversion and reducing the voltage and current stress of a chopper circuit, and specifically comprises a half-bridge subunit V1 and a half-bridge subunit V2, wherein the half-bridge subunit V1 and the half-bridge subunit V2 are respectively connected in parallel to two ends of a capacitor C1 and two ends of a capacitor C2. Wherein the half-bridge subunit V1 and the half-bridge subunit V2 are IGBT modules comprising two series-connected IGBT chips. When the bidirectional high-frequency isolation type DC/DC module works in the forward direction, the filtering boosting inductor L2 is used for filtering noise waves in a circuit, and when the bidirectional high-frequency isolation type DC/DC module works in the reverse direction, the filtering boosting inductor L2 is used for boosting voltage. One end of the filter boosting inductor L2 is connected between two IGBT chips in the half-bridge subunit V1, and the other end of the filter boosting inductor L2 is used as a voltage input end or a voltage output end of the three-level boosting circuit.
The three-level buck-boost circuit adopts multi-level phase-staggered control, and the working mode of the three-level buck-boost circuit is as follows: the bidirectional LLC full-bridge resonant conversion circuit works in a forward three-level step-down mode during normal power supply, the input of the bidirectional LLC full-bridge resonant conversion circuit is traction direct-current bus voltage DC3600V, and the output of the bidirectional LLC full-bridge resonant conversion circuit is used as the input of the bidirectional LLC full-bridge resonant conversion circuit; when the emergency traction power supply is carried out, the emergency traction power supply works in a reverse three-level boosting mode, the input of the emergency traction power supply is the output of the bidirectional LLC full-bridge resonant conversion circuit, and the output of the bidirectional LLC full-bridge resonant conversion circuit is output to the traction direct-current bus DC3600V to carry out emergency power supply on the traction inverter.
The high-voltage sides of the two bidirectional LLC full-bridge resonant conversion circuits are connected in series and the low-voltage sides are connected in parallel, and phase-staggered control is adopted. The bidirectional LLC full-bridge resonant conversion circuit is used for realizing power bidirectional conversion and electrical isolation of input and output, and all switching tubes of the bidirectional LLC full-bridge resonant conversion circuit can realize zero-voltage switching-on when being used as chopper tubes and can realize zero-current switching-off when being used as rectifier tubes, so that the conversion efficiency is improved. Because the circuit structures of the two bidirectional LLC full-bridge resonant conversion circuits are completely the same, in order to distinguish the two bidirectional LLC full-bridge resonant conversion circuits, the two bidirectional LLC full-bridge resonant conversion circuits are named as a first bidirectional LLC full-bridge resonant conversion circuit and a second bidirectional LLC full-bridge resonant conversion circuit respectively. The first bidirectional LLC full-bridge resonant conversion circuit is described in detail below. The first bidirectional LLC full-bridge resonant conversion circuit comprises a second voltage-sharing unit, a first full-bridge unit, a transformation unit and a second full-bridge unit which are connected in sequence. Specifically, the second voltage equalizing unit comprises a capacitor C3 and a resistor R3 which are connected in parallel and are used for voltage division in the circuit. The first full-bridge unit comprises two parallel-connected half-bridge sub-units V3 and V4, and the half-bridge sub-unit V3 and the resistor R3 of the second voltage-sharing unit are connected in parallel to form the full-bridge unit. Further, the half-bridge unit V3 and the half-bridge unit V4 are also formed by selecting an IGBT module including two series-connected IGBT chips. The transforming unit includes a high frequency transformer Tr1 and a resonant cavity connected to each other, the resonant cavity including a resonant inductor Lr1, a first resonant capacitor Cr1, and a second resonant capacitor Cr 2. One end of a resonant inductor Lr1 is connected in series with one end of the primary side of the high-frequency transformer Tr1, and the other end of the resonant inductor Lr1 is connected between two IGBT chips in the half-bridge subunit V3. One end of the first resonant capacitor Cr1 is connected in series with the other end of the primary side of the high-frequency transformer Tr1, and the other end is connected between two IGBT chips in the half-bridge subunit V4. The second resonant capacitor Cr2 is connected in series to the secondary side of the high-frequency transformer Tr 1. The structure of the second full-bridge unit is identical to that of the first full-bridge unit, and specifically comprises two half-bridge sub-units V7 and V8 connected in parallel. The corresponding half-bridge sub-cell V7 and half-bridge sub-cell V8 also select an IGBT module comprising two series-connected IGBT chips as the half-bridge sub-cell. One end of the secondary side of the high-frequency transformer Tr1 is connected with the two IGBT chips in the half sub-bridge unit V7, and the other end of the secondary side of the high-frequency transformer Tr1 is connected with the two IGBT chips in the half sub-bridge unit V8 through a second resonant capacitor Cr 2.
Correspondingly, the second bidirectional LLC full-bridge resonant conversion circuit and the first bidirectional LLC full-bridge resonant conversion circuit are identical in structure, and the second bidirectional LLC full-bridge resonant conversion circuit correspondingly comprises electronic components including a capacitor C4, a resistor R4, half-bridge sub-units V5-V6 and V9-V10, a high-frequency transformer Tr2, a resonant inductor Lr2, a first resonant capacitor Cr3 and a second resonant capacitor Cr 4. The capacitor C4 and the resistor R4 are connected in parallel to form a second voltage-sharing unit of the second bidirectional LLC full-bridge resonant conversion circuit; the half sub-bridge unit V5 and the half sub-bridge unit V6 are connected in parallel to form a first full-bridge unit of the second bidirectional LLC full-bridge resonant conversion circuit; the resonant inductor Lr2, the first resonant capacitor Cr3 and the second resonant capacitor Cr4 are respectively connected in series with the primary side and the secondary side of the high-frequency transformer Tr2 correspondingly to form a transformation unit of a second bidirectional LLC full-bridge resonant conversion circuit; the half sub-bridge unit V9 and the half sub-bridge unit V10 are connected in parallel to form a second full-bridge unit of the second bidirectional LLC full-bridge resonant conversion circuit. And the connection modes of a second voltage-sharing unit, a first full-bridge unit, a voltage transformation unit and a second full-bridge unit in the second bidirectional LLC full-bridge resonant conversion circuit are correspondingly the same.
The specific implementation mode that the high-voltage side of the two-way bidirectional LLC full-bridge resonant conversion circuit is connected in series and the low-voltage side is connected in parallel is that after the capacitor C3 and the capacitor C4 are connected in series, one end of the capacitor C3 is connected with two IGBT chips in the half-bridge subunit V1 through the filter boosting inductor L2, and the other end of the capacitor C4 is connected with two IGBT chips in the half-bridge subunit V2; both ends of the half-bridge subunit V8 are connected to both ends of the half-bridge subunit V10, respectively.
It should be noted that all the half-bridge units may also be in other reasonable forms, and are not limited to the form of the IGBT module including two series-connected IGBT chips.
Two-way LLC full-bridge resonance converting circuit all adopts wrong phase control, and its specific working method is: the circuit works in a forward LLC mode during normal power supply, the input of the circuit is the output of a three-level buck-boost circuit, and the output of the circuit is an auxiliary direct-current bus DC 700V; the emergency traction power supply works in a reverse LLC mode, the input of the emergency traction power supply is an auxiliary direct current bus DC700V, and the output of the emergency traction power supply is used as the input of a three-level buck-boost circuit.
In a preferred embodiment of the present application, the bidirectional high-frequency isolated DC/DC module further includes a pre-charging circuit, and the pre-charging circuit is connected to an input terminal of the three-level buck-boost circuit, and is configured to pre-charge the voltage-dividing capacitor C1 and the capacitor C2 in the first voltage-dividing circuit of the three-level buck-boost circuit when the module is normally powered. Specifically, the precharge circuit includes a direct current contactor KM2 and a resistor RP connected in series, and a direct current contactor KM1 connected in parallel across the direct current contactor KM2 and the resistor RP. When the bidirectional high-frequency isolation type DC/DC module normally works, the direct current contactor KM1 is opened, the direct current contactor KM2 is closed, the middle direct current bus is pulled to pre-charge the voltage division capacitor C1 and the capacitor C2, the direct current contactor KM2 is opened after charging is completed, the direct current contactor KM1 is closed, and the bidirectional high-frequency isolation type DC/DC module works in the forward direction. It should be noted that the specific structure of the pre-charge circuit may also be in other reasonable forms.
In a preferred embodiment of the present application, the bidirectional high-frequency isolated DC/DC module further includes a filter circuit, and the filter circuit is connected between the traction intermediate DC bus and the pre-charging circuit, and is configured to filter the current transmitted by the traction intermediate DC bus, so as to filter the high-frequency noise and smooth the voltage on the high-voltage side. Specifically, the filter circuit includes an inductor L1, a capacitor Cin, and a resistor Rin, which are connected in series in this order. The inductor L1 and the capacitor Cin are connected to a precharge circuit. It should be noted that the specific structure of the filter circuit may also be in other reasonable forms.
In a preferred embodiment of the present application, the bidirectional high-frequency isolated DC/DC module further includes a filter capacitor circuit for filtering the DC voltage in the auxiliary intermediate DC bus. Specifically, the capacitor comprises a capacitor C5 connected to two ends of a half sub-bridge unit V8 in parallel and a capacitor C6 connected to two ends of a half sub-bridge unit V10 in parallel.
The bidirectional high-frequency isolation type DC/DC module provided by the embodiment of the invention can be applied to a high-frequency auxiliary converter system to realize the power bidirectional conversion function of the converter system. When the pantograph net is normal, the bidirectional high-frequency isolation type DC/DC module works in a forward mode to provide electric energy for the auxiliary load and the storage battery; when the pantograph is powered off, the bidirectional high-frequency isolation type DC/DC module works in a reverse mode, and the energy of the vehicle-mounted storage battery can be converted into a traction direct-current bus through the module, so that the emergency traction function of the storage battery of the train is realized. The three-level buck-boost circuit realizes power bidirectional conversion, adopts multi-level phase-staggered control, can reduce voltage and current stress, and improves the working capacity of the circuit under the condition of wide input and output; the bidirectional LLC resonant soft switching circuit realizes bidirectional power conversion, adopts phase-staggered control to reduce current pulsation, realizes soft switching in a full-load range in both forward and reverse directions, and improves conversion efficiency; the multi-level technology, the phase-staggered control technology and the soft switching technology are used for further improving the working frequency of the module, reducing the volume and weight of the module, improving the power density of the module and meeting the requirements of miniaturization and light weight.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A bidirectional high-frequency isolated DC/DC module for realizing bidirectional transmission of electric quantity, comprising:
a three-level buck-boost circuit;
and the two bidirectional LLC full-bridge resonant conversion circuits are respectively connected with the three-level buck-boost circuit.
2. The bidirectional high-frequency isolated DC/DC module according to claim 1, wherein the three-level buck-boost circuit comprises a first voltage-equalizing unit, a buck-boost chopper unit and a filter boost inductor, which are connected in sequence.
3. The bi-directional high-frequency isolated DC/DC module according to claim 2, wherein the buck-boost chopper unit comprises two series-connected half-bridge sub-units.
4. The bidirectional high-frequency isolated DC/DC module according to claim 3, wherein the high-voltage side of the two bidirectional LLC full-bridge resonant conversion circuits are connected in series and in parallel with the low-voltage side.
5. The bidirectional high-frequency isolated DC/DC module according to claim 4, wherein the bidirectional LLC full-bridge resonant conversion circuit comprises a second voltage equalizing unit, a first full-bridge unit, a voltage transforming unit and a second full-bridge unit which are connected in sequence.
6. The isolated DC/DC module of claim 5, wherein the first full-bridge unit and the second full-bridge unit are identical in structure, and the first full-bridge unit comprises two half-bridge sub-units connected in parallel, the half-bridge sub-units comprise IGBT modules, and the IGBT modules comprise two IGBT chips connected in series.
7. The bidirectional high-frequency isolated DC/DC module according to claim 5 or 6, wherein the transforming unit comprises a high-frequency transformer and a resonant cavity;
the resonant cavity comprises a resonant inductor, a first resonant capacitor and a second resonant capacitor, the resonant inductor is connected in series with one end of the primary side of the high-frequency transformer, the first resonant capacitor is connected in series with the other end of the primary side of the high-frequency transformer, and the second resonant capacitor is connected in series with one end of the secondary side of the high-frequency transformer.
8. The bi-directional high-frequency isolated DC/DC module according to any of claims 1-7, further comprising a pre-charge circuit connected to the three-level buck-boost circuit, the pre-charge circuit being configured to charge a voltage-dividing capacitor.
9. The bi-directional high-frequency isolated DC/DC module according to any of claims 1-8, further comprising a filter circuit connected to the pre-charge circuit for filtering out high-frequency noise in the circuit.
10. The bi-directional high-frequency isolated DC/DC module according to any of claims 1-9, further comprising a filter capacitor circuit connected to an output of the bi-directional LLC full-bridge resonant conversion circuit, the filter capacitor circuit being configured to filter the DC voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810843959.XA CN110768531A (en) | 2018-07-27 | 2018-07-27 | Bidirectional high-frequency isolation type DC/DC module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810843959.XA CN110768531A (en) | 2018-07-27 | 2018-07-27 | Bidirectional high-frequency isolation type DC/DC module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110768531A true CN110768531A (en) | 2020-02-07 |
Family
ID=69327833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810843959.XA Pending CN110768531A (en) | 2018-07-27 | 2018-07-27 | Bidirectional high-frequency isolation type DC/DC module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110768531A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111884511A (en) * | 2019-10-25 | 2020-11-03 | 株洲中车时代电气股份有限公司 | Bidirectional DC/DC device and converter system |
| CN113258780A (en) * | 2021-05-11 | 2021-08-13 | 中车青岛四方车辆研究所有限公司 | Parameter selection method and control method for tramcar auxiliary power supply DC/DC circuit |
| CN113659807A (en) * | 2021-08-18 | 2021-11-16 | 中车青岛四方车辆研究所有限公司 | DC/DC module and high-frequency auxiliary converter equipment with same |
| CN113783251A (en) * | 2021-08-26 | 2021-12-10 | 四川科陆新能电气有限公司 | Virtual internal resistance adjusting circuit for balancing between battery clusters |
| CN114024448A (en) * | 2022-01-04 | 2022-02-08 | 浙江富特科技股份有限公司 | Bidirectional DC converter and system |
| CN114024444A (en) * | 2021-11-05 | 2022-02-08 | 中车青岛四方车辆研究所有限公司 | Auxiliary converter applicable to double-voltage system and control method thereof |
| CN114400898A (en) * | 2022-03-08 | 2022-04-26 | 广州菲利斯太阳能科技有限公司 | Inverter circuit power regulation method and system based on BUCK-BOOST |
| CN114531031A (en) * | 2020-11-23 | 2022-05-24 | 中国船舶重工集团公司第七一一研究所 | Control system and control method of marine high-power bidirectional direct current converter |
| CN115133777A (en) * | 2022-07-22 | 2022-09-30 | 北京雷动智创科技有限公司 | Isolated DC converter and control method |
| CN116647131A (en) * | 2023-07-26 | 2023-08-25 | 深圳市鼎泰佳创科技有限公司 | Bidirectional isolation type DC-DC topological structure |
| WO2024060312A1 (en) * | 2022-09-21 | 2024-03-28 | 株洲中车时代电气股份有限公司 | Converter module and converter |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746557A (en) * | 2013-12-17 | 2014-04-23 | 中国船舶重工集团公司第七一九研究所 | Bidirectional multi-level buck-boost converter and control method thereof |
| CN105356758A (en) * | 2015-12-03 | 2016-02-24 | 东北电力大学 | High frequency isolated DC-DC two stage power conversion system structure |
| CN105743344A (en) * | 2016-04-14 | 2016-07-06 | 西安许继电力电子技术有限公司 | Isolated three-level bidirectional DC-DC converter with coupling inductor |
| CN106160491A (en) * | 2016-06-30 | 2016-11-23 | 浙江大学 | Wide-voltage range High-current output DC/DC changer |
| CN106712156A (en) * | 2016-10-19 | 2017-05-24 | 佛山市柏克新能科技股份有限公司 | Multi-energy-converted inversion device and control method thereof |
| CN106877674A (en) * | 2017-03-21 | 2017-06-20 | 许继集团有限公司 | Mode of resonance DC/DC inverter powers balance control method and control system |
| CN107128211A (en) * | 2017-06-05 | 2017-09-05 | 中车工业研究院有限公司 | Train traction and braking control system, train traction and brake control method |
-
2018
- 2018-07-27 CN CN201810843959.XA patent/CN110768531A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746557A (en) * | 2013-12-17 | 2014-04-23 | 中国船舶重工集团公司第七一九研究所 | Bidirectional multi-level buck-boost converter and control method thereof |
| CN105356758A (en) * | 2015-12-03 | 2016-02-24 | 东北电力大学 | High frequency isolated DC-DC two stage power conversion system structure |
| CN105743344A (en) * | 2016-04-14 | 2016-07-06 | 西安许继电力电子技术有限公司 | Isolated three-level bidirectional DC-DC converter with coupling inductor |
| CN106160491A (en) * | 2016-06-30 | 2016-11-23 | 浙江大学 | Wide-voltage range High-current output DC/DC changer |
| CN106712156A (en) * | 2016-10-19 | 2017-05-24 | 佛山市柏克新能科技股份有限公司 | Multi-energy-converted inversion device and control method thereof |
| CN106877674A (en) * | 2017-03-21 | 2017-06-20 | 许继集团有限公司 | Mode of resonance DC/DC inverter powers balance control method and control system |
| CN107128211A (en) * | 2017-06-05 | 2017-09-05 | 中车工业研究院有限公司 | Train traction and braking control system, train traction and brake control method |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111884511A (en) * | 2019-10-25 | 2020-11-03 | 株洲中车时代电气股份有限公司 | Bidirectional DC/DC device and converter system |
| CN114531031B (en) * | 2020-11-23 | 2024-03-19 | 中国船舶集团有限公司第七一一研究所 | Control system and control method of marine high-power bidirectional direct current converter |
| CN114531031A (en) * | 2020-11-23 | 2022-05-24 | 中国船舶重工集团公司第七一一研究所 | Control system and control method of marine high-power bidirectional direct current converter |
| CN113258780A (en) * | 2021-05-11 | 2021-08-13 | 中车青岛四方车辆研究所有限公司 | Parameter selection method and control method for tramcar auxiliary power supply DC/DC circuit |
| CN113659807A (en) * | 2021-08-18 | 2021-11-16 | 中车青岛四方车辆研究所有限公司 | DC/DC module and high-frequency auxiliary converter equipment with same |
| CN113783251A (en) * | 2021-08-26 | 2021-12-10 | 四川科陆新能电气有限公司 | Virtual internal resistance adjusting circuit for balancing between battery clusters |
| CN113783251B (en) * | 2021-08-26 | 2024-04-16 | 四川科陆新能电气有限公司 | Virtual internal resistance regulating circuit for balancing among battery clusters |
| CN114024444B (en) * | 2021-11-05 | 2023-08-08 | 中车青岛四方车辆研究所有限公司 | Auxiliary converter applicable to double-voltage type and control method thereof |
| CN114024444A (en) * | 2021-11-05 | 2022-02-08 | 中车青岛四方车辆研究所有限公司 | Auxiliary converter applicable to double-voltage system and control method thereof |
| CN114024448A (en) * | 2022-01-04 | 2022-02-08 | 浙江富特科技股份有限公司 | Bidirectional DC converter and system |
| CN114024448B (en) * | 2022-01-04 | 2022-03-11 | 浙江富特科技股份有限公司 | Bidirectional DC converter and system |
| CN114400898A (en) * | 2022-03-08 | 2022-04-26 | 广州菲利斯太阳能科技有限公司 | Inverter circuit power regulation method and system based on BUCK-BOOST |
| CN115133777A (en) * | 2022-07-22 | 2022-09-30 | 北京雷动智创科技有限公司 | Isolated DC converter and control method |
| WO2024060312A1 (en) * | 2022-09-21 | 2024-03-28 | 株洲中车时代电气股份有限公司 | Converter module and converter |
| CN116647131A (en) * | 2023-07-26 | 2023-08-25 | 深圳市鼎泰佳创科技有限公司 | Bidirectional isolation type DC-DC topological structure |
| CN116647131B (en) * | 2023-07-26 | 2024-01-30 | 深圳市鼎泰佳创科技有限公司 | Bidirectional isolation type DC-DC topological structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110768531A (en) | Bidirectional high-frequency isolation type DC/DC module | |
| US11323038B2 (en) | Single phase single stage bi-directional level 1 electric vehicle battery charger | |
| CN108988451A (en) | Isolation type bidirectional charger control method and control circuit | |
| CN106899030B (en) | A kind of primary side integrated modular independent control battery energy storage system | |
| CN109167423A (en) | The electric integrating device of Vehicular charger and vehicle-mounted DCDC | |
| CN109874385B (en) | Power conversion system | |
| CN103944396A (en) | LLC resonance type three-port DC-DC converter and control method thereof | |
| WO2020019540A1 (en) | Bidirectional high-frequency auxiliary conversion system | |
| CN111200307A (en) | Energy balance control device, battery system and energy balance control method thereof | |
| CN103312178A (en) | Bi-directional DC/DC (direct current/direct current) converter and battery testing device applied with same | |
| CN102570571A (en) | Mixed energy storage device for automobile | |
| CN108312889B (en) | High-power high-efficiency bidirectional charger for subway vehicle | |
| CN109367417A (en) | Two-stage bidirectional power inverter and control method with charging and V2G function | |
| Mirzaei et al. | A novel soft switching bidirectional coupled inductor buck-boost converter for battery discharging-charging | |
| CN107834581A (en) | A kind of battery energy storage system of Multiple coil resonance separate current control | |
| CN206259854U (en) | A kind of On-Board Vehicle DC/DC Converter | |
| CN105827109B (en) | A kind of redundant direct current translation circuit and its control method | |
| CN209079670U (en) | Two-stage bidirectional power inverter with charging and V2G function | |
| CN107204707A (en) | A kind of two-way isolation DC/DC converter and its control method for being used to suppress peak voltage | |
| CN112968603B (en) | Wide-transformation-ratio transformerless buck-boost converter | |
| CN110061626A (en) | A kind of charging station with high voltage dc bus | |
| CN103904736A (en) | Voltage balance type super-capacitor energy storage device | |
| CN105763065A (en) | Vehicle-mounted inversion device for different input voltages | |
| Geethanjali et al. | Testing and implementation of dual way DC-DC converter for electric vehicle power train system | |
| CN213937521U (en) | Three-stage topological structure charger with high-low voltage output |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200207 |