CN111628647A - Bidirectional DC/DC converter - Google Patents
Bidirectional DC/DC converter Download PDFInfo
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- CN111628647A CN111628647A CN202010443936.7A CN202010443936A CN111628647A CN 111628647 A CN111628647 A CN 111628647A CN 202010443936 A CN202010443936 A CN 202010443936A CN 111628647 A CN111628647 A CN 111628647A
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- Prior art keywords
- bidirectional
- converter
- circuit
- inductor
- gate bipolar
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Classifications
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- 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
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
-
- 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
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a bidirectional DC/DC converter which comprises a direct-current power supply, an energy storage filter circuit and a chopper circuit, wherein the anode of the power supply is connected with the input end circuit of the energy storage filter circuit, the output end of the energy storage filter circuit is connected with the input end circuit of the chopper circuit, and the output end of the chopper circuit is connected into a direct-current bus and is output through the direct-current bus. The invention improves the efficiency of the DC/DC converter, improves the stability and the precision of the output current, is beneficial to the cyclic utilization of energy among different bidirectional DC/DC converters and achieves the aim of optimal energy-saving test.
Description
Technical Field
The invention belongs to the technical field of direct-current micro-grids, and particularly relates to a bidirectional DC/DC converter.
Background
An energy storage system taking a lithium ion battery as a core is indispensable in the fields of new energy power generation, electric automobiles and the like, and higher requirements including wide voltage working range, high efficiency, electrical isolation and the like are put forward for a charge-discharge bidirectional power conversion system.
The existing DC/DC converter for the direct current charging pile usually adopts a bidirectional high-frequency isolation DC/DC converter, and the single module function cannot be increased due to the limitation of a high-frequency transformer. Therefore, for a large-current detection working condition, multiple modules are required to be connected in parallel, and the complexity of the system is increased to form the cost of the system. Secondly, the multi-module parallel communication inevitably affects the multi-module parallel output dynamic response time, and the requirement of severe working condition detection is difficult to meet. In addition, the existing bidirectional high-frequency isolation DC/DC converter is low in efficiency, high in electricity consumption cost and unsatisfactory in energy-saving test effect in the long-time detection process of the vehicle-mounted power battery.
Therefore, aiming at the application requirements of large current, quick detection and the like of the power battery of the conventional electric bus, the invention of the bidirectional AC/DC converter with high efficiency, high power, low cost and reliability is very necessary.
Disclosure of Invention
In view of the deficiencies of the prior art, the present invention provides a bidirectional DC/DC converter that solves the problems mentioned in the background.
The technical scheme of the invention is realized as follows:
a bidirectional DC/DC converter comprises a direct-current power supply, an energy storage filter circuit and a chopper circuit, wherein the anode of the power supply is connected with the input end circuit of the energy storage filter circuit, the output end of the energy storage filter circuit is connected with the input end circuit of the chopper circuit, and the output end of the chopper circuit is connected into a direct-current bus and is output through the direct-current bus.
Furthermore, the energy storage filter circuit comprises an inductor L1, an inductor L2 and a capacitor C1, wherein the positive electrode of the direct current power supply is connected with the positive electrode of the power supply at one end of the inductor L1, and the other end of the inductor L1 is connected with one end of the inductor L2; one end of the capacitor C1 is connected to the node X connecting the inductor L1 and the inductor L2, and the other end is connected to the negative terminal of the power supply Vcc.
Further, the chopper circuit comprises an insulated gate bipolar transistor S1 and an insulated gate bipolar transistor S2, wherein the collector of the insulated gate bipolar transistor S1 is connected with the anode of the direct current bus, and the emitter of the insulated gate bipolar transistor S1 is connected with the collector of the insulated gate bipolar transistor S2; the other end of the inductor L2 is connected to a node Y connecting the emitter of the igbt S1 and the collector of the igbt S2.
Further, the chopper circuit further includes a capacitor C2, and one end of the capacitor C2 is connected to the collector of the insulated gate bipolar transistor S1, and the other end is connected to the emitter of the insulated gate bipolar transistor S2.
Compared with the prior art, the invention has the following advantages: the main circuit topological structure of the bidirectional DC/DC converter is in a non-isolation mode, so that the efficiency of the DC/DC converter is improved; in addition, the power of the bidirectional DC/DC converter is not limited by the power of a high-frequency transformer, so that the power can be made larger.
The bidirectional DC/DC converter has the advantages that the number of the insulated gate bipolar transistors is small, the system reliability is high, and the control algorithm is simple; in addition, because the bidirectional DC/DC converter is provided with the direct current bus, the input end of the bidirectional DC/DC converter is concentrated on the direct current bus, the stability and the precision of output current are improved, the energy can be recycled among different bidirectional DC/DC converters, and the purpose of optimal energy-saving test is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a system block diagram of a bidirectional DC/DC converter of the present invention;
FIG. 2 is a schematic circuit diagram of a bidirectional DC/DC converter according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a bidirectional DC/DC conversion circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the invention discloses a bidirectional DC/DC converter, which includes a plurality of bidirectional DC/DC conversion circuits connected in parallel to a DC bus, wherein referring to fig. 2, the bidirectional DC/DC conversion circuits include a DC power supply, an energy storage filter circuit, and a chopper circuit, the positive electrode of the power supply is connected to the input end circuit of the energy storage filter circuit, the output end of the energy storage filter circuit is connected to the input end circuit of the chopper circuit, and the output end of the chopper circuit is connected to the DC bus and outputs the DC bus. The direct current power supply can be a voltage source or a current source.
Specifically, the energy storage filter circuit comprises an inductor L1, an inductor L2 and a capacitor C1, wherein the positive electrode of the direct current power supply is connected with the positive electrode of the power supply at one end of the inductor L1, and the other end of the inductor L1 is connected with one end of the inductor L2; one end of the capacitor C1 is connected to the node X connecting the inductor L1 and the inductor L2, and the other end is connected to the negative terminal of the power supply Vcc. In the embodiment of the invention, the inductor L2, the capacitor C1 and the inductor L1 form a T-shaped filter, the insulated gate bipolar transistor S1 and the insulated gate bipolar transistor S2 form two transistors of a bridge arm, and square waves output by the middle points of the bridge arms S1 and S2 are filtered into a stable direct current source, so that the charging and discharging precision and stability of the battery are improved, and the damage to the battery in the detection process of the power battery is ensured.
Specifically, the chopper circuit comprises an insulated gate bipolar transistor S1 and an insulated gate bipolar transistor S2, wherein a collector of the insulated gate bipolar transistor S1 is connected with the positive electrode of the direct-current bus, and an emitter of the insulated gate bipolar transistor S1 is connected with a collector of the insulated gate bipolar transistor S2; the other end of the inductor L2 is connected to a node Y connecting the emitter of the igbt S1 and the collector of the igbt S2.
Specifically, the chopper circuit further includes a capacitor C2, one end of the capacitor C2 is connected to the collector of the insulated gate bipolar transistor S1, and the other end is connected to the emitter of the insulated gate bipolar transistor S2. In the embodiment of the invention, the capacitor C2 keeps the voltage of the input end stable and keeps the stability and the precision of the charging and discharging current of the battery under the condition that the insulated gate bipolar transistor S1 and the insulated gate bipolar transistor S2 are turned on at high speed.
In the invention, when the bidirectional DC/DC converter works, as shown in FIG. 1, taking two-way output as an example, the battery BAT1 of the first-way circuit discharges, the energy of the battery BAT1 is discharged onto a direct current bus through the energy storage filter circuit and the chopper circuit, and the battery BAT2 of the second-way circuit is charged, namely, the energy released by the first-way battery charges the battery BAT2 through the chopper circuit and the energy storage filter circuit; the purpose of high-efficiency cycle transfer of energy from the battery BAT1 to the battery BAT2 is achieved. Because the direct current buses of the two bidirectional DC/DC conversion circuits are combined together, the capacitor C1 at the high-voltage end and the capacitor C2 at the high-voltage end are connected in parallel, the filtering effect is improved, and the current stability and the accuracy of the battery end are improved.
In the embodiment of the invention, the negative electrode (-BUS) of the input end of the bidirectional DC/DC converter is directly connected with the negative electrode of the battery Vcc at the output end, so that the formed main circuit topological structure is in a non-isolation mode. The existing high-frequency transformer converts electric energy into magnetic energy according to the electric field changed on the primary side, and then converts the magnetic energy into electric energy after the magnetic energy is transmitted to the secondary side; therefore, the maximum power which can be transmitted by the determined type of transformer is limited by the volume of the transformer, but the bidirectional DC/DC converter does not use the transformer, so that the maximum power is not limited by the maximum power transmitted by the high-frequency transformer, and the power can be made larger.
The element count method is a method of predicting the reliability of a cell and a system in terms of the number of different kinds of components (resistors, capacitors, diodes, transistors, etc.), according to which: under the condition of not considering the working temperature and stress, the working failure rate of a single element is lambda pi, then the number Ni of each type of element is multiplied by the failure rate lambda pi, and finally the products are summed to obtain the failure rate lambda s of the system. Namely: λ s ═ Σ λ pi ×. λ pi. The bidirectional DC/DC converter only adopts two insulated gate bipolar transistors S1 and S2, and the two transistors have lower failure probability than the bidirectional DC/DC converter with a plurality of transistors, so the system reliability is higher, and the control algorithm is simpler. Therefore, the loss of the bidirectional DC/DC converter is mainly reflected on the S1 and S2 transistors, and the efficiency of the DC/DC converter is greatly improved.
In addition, because the bidirectional DC/DC converter is provided with the direct current bus, the input end of the bidirectional DC/DC conversion circuit is concentrated on the direct current bus, thereby not only improving the stability and the precision of the output current, but also being beneficial to the cyclic utilization of energy among different bidirectional DC/DC converters and achieving the purpose of optimal energy-saving test.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. The bidirectional DC/DC converter is characterized by comprising a direct-current power supply, an energy storage filter circuit and a chopper circuit, wherein the positive electrode of the power supply is connected with the input end circuit of the energy storage filter circuit, the output end of the energy storage filter circuit is connected with the input end circuit of the chopper circuit, and the output end of the chopper circuit is connected into a direct-current bus and outputs through the direct-current bus.
2. The bidirectional DC/DC converter according to claim 1, wherein the energy storage filter circuit comprises an inductor L1, an inductor L2 and a capacitor C1, wherein the positive pole of the DC power supply is connected with the positive pole of the power supply at one end of the inductor L1, and the other end of the inductor L1 is connected with one end of an inductor L2; one end of the capacitor C1 is connected to the node X connecting the inductor L1 and the inductor L2, and the other end is connected to the negative terminal of the power supply Vcc.
3. The bidirectional DC/DC converter of claim 1, wherein the chopper circuit includes an insulated-gate bipolar transistor S1 and an insulated-gate bipolar transistor S2, a collector of the insulated-gate bipolar transistor S1 being connected to an anode of the DC bus, an emitter of the insulated-gate bipolar transistor S1 being connected to a collector of the insulated-gate bipolar transistor S2; the other end of the inductor L2 is connected to a node Y connecting the emitter of the igbt S1 and the collector of the igbt S2.
4. The bi-directional DC/DC converter of claim 1, wherein the chopper circuit further comprises a capacitor C2, wherein one terminal of the capacitor C2 is connected to the collector of the igbt S1 and the other terminal is connected to the emitter of the igbt S2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010443936.7A CN111628647A (en) | 2020-05-22 | 2020-05-22 | Bidirectional DC/DC converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010443936.7A CN111628647A (en) | 2020-05-22 | 2020-05-22 | Bidirectional DC/DC converter |
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| Publication Number | Publication Date |
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| CN111628647A true CN111628647A (en) | 2020-09-04 |
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| CN202010443936.7A Pending CN111628647A (en) | 2020-05-22 | 2020-05-22 | Bidirectional DC/DC converter |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102122826A (en) * | 2011-01-17 | 2011-07-13 | 中国南方电网有限责任公司电网技术研究中心 | Energy storage bidirectional current converter for high-capacity storage battery |
| CN102377192A (en) * | 2011-10-31 | 2012-03-14 | 清华大学 | Direct-driving wave power-generating and energy-storing device and control method |
| CN102891519A (en) * | 2012-11-02 | 2013-01-23 | 上海同异动力科技有限公司 | Equalization circuit of battery pack |
| CN105281401A (en) * | 2015-10-10 | 2016-01-27 | 中国农业大学 | Novel storage battery charging and discharging system |
| CN206211639U (en) * | 2016-11-17 | 2017-05-31 | 安徽工程大学 | A kind of composite energy storing device for being applied to electric automobile |
| CN108123598A (en) * | 2017-12-29 | 2018-06-05 | 北京天诚同创电气有限公司 | Two-way DC/DC converters, two-way voltage conversion method, apparatus and system |
| CN108173280A (en) * | 2017-12-29 | 2018-06-15 | 北京天诚同创电气有限公司 | Light stores up integral system |
| CN109120049A (en) * | 2018-10-24 | 2019-01-01 | 珠海泰通电气技术有限公司 | A kind of non-isolated charge-discharge system of energy in bidirectional flow |
-
2020
- 2020-05-22 CN CN202010443936.7A patent/CN111628647A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102122826A (en) * | 2011-01-17 | 2011-07-13 | 中国南方电网有限责任公司电网技术研究中心 | Energy storage bidirectional current converter for high-capacity storage battery |
| CN102377192A (en) * | 2011-10-31 | 2012-03-14 | 清华大学 | Direct-driving wave power-generating and energy-storing device and control method |
| CN102891519A (en) * | 2012-11-02 | 2013-01-23 | 上海同异动力科技有限公司 | Equalization circuit of battery pack |
| CN105281401A (en) * | 2015-10-10 | 2016-01-27 | 中国农业大学 | Novel storage battery charging and discharging system |
| CN206211639U (en) * | 2016-11-17 | 2017-05-31 | 安徽工程大学 | A kind of composite energy storing device for being applied to electric automobile |
| CN108123598A (en) * | 2017-12-29 | 2018-06-05 | 北京天诚同创电气有限公司 | Two-way DC/DC converters, two-way voltage conversion method, apparatus and system |
| CN108173280A (en) * | 2017-12-29 | 2018-06-15 | 北京天诚同创电气有限公司 | Light stores up integral system |
| CN109120049A (en) * | 2018-10-24 | 2019-01-01 | 珠海泰通电气技术有限公司 | A kind of non-isolated charge-discharge system of energy in bidirectional flow |
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