CN111404393A - Vehicle-mounted charging circuit and bidirectional direct current conversion circuit - Google Patents
Vehicle-mounted charging circuit and bidirectional direct current conversion circuit Download PDFInfo
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- CN111404393A CN111404393A CN202010510078.3A CN202010510078A CN111404393A CN 111404393 A CN111404393 A CN 111404393A CN 202010510078 A CN202010510078 A CN 202010510078A CN 111404393 A CN111404393 A CN 111404393A
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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
- H02M3/22—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
- H02M3/33569—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 several active switching elements
- H02M3/33576—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 several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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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
- B60L53/20—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 characterised by converters located in the vehicle
- B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/143—Arrangements for reducing ripples from dc input or output using compensating arrangements
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
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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
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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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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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
- Y02T10/72—Electric energy management in electromobility
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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
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
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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
- 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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- 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
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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- Mechanical Engineering (AREA)
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Abstract
The utility model provides an on-vehicle charging circuit and two-way DC conversion circuit, relate to car new forms of energy technical field, including alternating current-direct current conversion circuit and two-way DC conversion circuit, wherein, alternating current-direct current conversion circuit is used for converting the alternating current of alternating current power supply input into direct current output and gives two-way DC conversion circuit, two-way DC conversion circuit includes at least one LL C resonance transform unit circuit, every LL C resonance transform unit circuit includes first single-phase full-bridge rectifier circuit, first resonance compensating circuit, transformer circuit and the single-phase full-bridge rectifier circuit of second, because carry out unilateral resonance compensation to LL C resonance transform unit circuit, make the resonant current wave form more smooth, the noise and the loss of reducible two-way DC converter are few to the electric current clutter, still can reduce the quantity of resonant element simultaneously, and then reduce two-way DC conversion circuit.
Description
Technical Field
The invention relates to the technical field of new energy of automobiles, in particular to a vehicle-mounted charging circuit and a bidirectional direct current conversion circuit.
Background
With the rapid development of power electronic technology, people's demand for various electronic products is increasing day by day. For small-power portable products, people pursue small and portable products; for high-power products, people seek higher efficiency due to the concerns about energy shortage and environmental pollution, and particularly, the demand for electric vehicles or electric tools is also increasing and common. Among them, as the amount of new energy electric vehicles increases year by year, the vehicle charger technology has also been rapidly developed along with the popularization of new energy electric vehicles. In the prior art, the charging solution of the electric vehicle mainly includes two modes of contact charging and non-contact charging, the contact charging is directly performed by an alternating current or direct current power supply, and the non-contact charging mostly adopts wireless charging. In the contact charging mode, in addition to the dc charging system, the electric vehicle must be equipped with an OBC (On-board Charger) so that the electric vehicle can be charged by using a household mains supply. The electric vehicle charging system develops towards the direction of high power and high efficiency so as to meet the requirements of ensuring the driving range as much as possible by using less charging times and time, and has the advantages of safety, reliability, high efficiency, high power density, low cost and the like. Therefore, how to improve the charging efficiency, power expandability and compatibility of the vehicle-mounted charger is a development direction of new energy automobiles.
The LL C resonant soft switching circuit has the advantages of no output filter inductor, low cost and small volume, and has great influence on the quantity, temperature rise and service life of the filter capacitor because the output filter inductor is not provided, particularly, the output filter capacitor is greatly influenced in a high-power low-voltage occasion, and the influence on the output Current of a vehicle charger is reduced as much as possible.
Disclosure of Invention
The invention mainly solves the technical problem of how to reduce the output ripple of an LL C resonant circuit in an on-board charger so as to reduce the loss of related electronic devices.
According to a first aspect, an embodiment provides an in-vehicle charging circuit, which includes an ac-dc conversion circuit and a bidirectional dc conversion circuit;
the alternating current-direct current conversion circuit comprises two alternating current input ends and two direct current output ends, the two alternating current input ends are used for being connected with an alternating current power supply, and the two direct current output ends are used for being connected with the bidirectional direct current conversion circuit; the alternating current-direct current conversion circuit is used for converting alternating current input by the alternating current power supply into direct current and outputting the direct current to the bidirectional direct current conversion circuit;
the bidirectional DC conversion circuit includes:
the first side positive connecting end and the first side negative connecting end, and at least one group of second side positive connecting end and second side negative connecting end; the first side positive connecting end and the first side negative connecting end are respectively connected with the two direct current output ends, and at least one group of second side positive connecting end and second side negative connecting end are used for being connected with a vehicle-mounted battery;
the LL C resonant transformation unit circuit comprises a first single-phase full-bridge rectification circuit, a first resonant compensation circuit, a transformation circuit and a second single-phase full-bridge rectification circuit;
the first single-phase full-bridge rectification circuit comprises a first connection end, a second connection end, a third connection end and a fourth connection end, and the first connection end and the second connection end of the first single-phase full-bridge rectification circuit are respectively connected with the first side positive connection end and the first side negative connection end;
the first resonance compensation circuit comprises a first connecting end, a second connecting end, a third connecting end and a fourth connecting end, and the first connecting end and the second connecting end of the first resonance compensation circuit are respectively connected with the third connecting end and the fourth connecting end of the first single-phase full-bridge rectification circuit;
the first connecting end and the second connecting end of the transformation circuit are respectively connected with the third connecting end and the fourth connecting end of the first resonance compensation circuit;
the second single-phase full-bridge rectification circuit comprises a first connecting end, a second connecting end, a third connecting end and a fourth connecting end, the first connecting end and the second connecting end of the second single-phase full-bridge rectification circuit are connected with the third connecting end and the fourth connecting end of the voltage transformation circuit, and the third connecting end and the fourth connecting end of the second single-phase full-bridge rectification circuit are respectively connected with a group of second side positive connecting ends and second side negative connecting ends corresponding to the LL C resonance transformation unit circuit.
Furthermore, the LL C resonant transformation unit circuits are n in number, and n is greater than or equal to 2.
Further, the bidirectional direct current conversion circuit further comprises a control circuit unit, an LL C control circuit unit and a sampling circuit unit;
the sampling circuit unit is connected with the first side positive connecting end and each group of second side positive connecting ends of the bidirectional direct current conversion circuits and is used for monitoring electric signals input into the bidirectional direct current conversion circuits;
the LL C control circuit unit is connected with each LL C resonance conversion unit circuit and is used for controlling the conversion direction of the bidirectional direct-current voltage of each LL C resonance conversion unit circuit;
the control circuit unit is respectively connected with the LL C control circuit unit and the sampling circuit unit, and the control circuit unit is used for monitoring electric signals at two sides of each LL C resonance conversion unit circuit through the sampling circuit unit and controlling the conversion direction of the bidirectional direct-current voltage of each LL C resonance conversion unit circuit through the LL C control circuit unit according to a monitoring result.
Further, the bidirectional dc conversion circuit further includes a switch circuit, which is respectively connected to the set of second-side positive connection terminals and the second-side negative connection terminals corresponding to each LL C resonant conversion unit circuit, and configured to switch and connect the set of second-side positive connection terminals and the set of second-side negative connection terminals corresponding to the n LL C resonant conversion unit circuits;
the switching circuit comprises a first positive connecting end, a first negative connecting end and n-1 groups of second positive connecting ends and second negative connecting ends, wherein the first positive connecting end and the first negative connecting end of the switching circuit are respectively connected with a group of corresponding second-side positive connecting ends and second-side negative connecting ends of one LL C resonance transformation unit circuit, and each group of second positive connecting ends and second negative connecting ends of the switching circuit are respectively connected with a group of corresponding second-side positive connecting ends and second-side negative connecting ends of one LL C resonance transformation unit circuit in the other n-1 LL C resonance transformation unit circuits.
Further, the switch circuit comprises n-1 double-pole double-throw analog switches, each of which comprises two input ends and two output ends; two output ends of each double-pole double-throw analog switch are respectively connected with a first positive connecting end and a first negative connecting end of the switch circuit, and two input ends of each double-pole double-throw analog switch are respectively connected with a group of second positive connecting ends and second negative connecting ends of the switch circuit.
Furthermore, the bidirectional direct current conversion circuit also comprises a control circuit unit and a sampling circuit unit;
the sampling circuit unit is respectively connected with the first side positive connecting end of the bidirectional direct current conversion circuit and each group of second side positive connecting ends and is used for monitoring an electric signal input into the bidirectional direct current conversion circuit;
and the control circuit unit is used for switching and connecting each group of second side positive connecting ends and second side negative connecting ends corresponding to the n LL C resonance transformation unit circuits through the switch circuit according to the monitoring result of the sampling circuit unit.
Further, the first single-phase full-bridge rectification circuit comprises a first control switch tube S1, a second control switch tube S2, a third control switch tube S3 and a fourth control switch tube S4; the first poles of the first control switch tube S1 and the second control switch tube S2 are connected to the first connection terminal of the first single-phase full-bridge rectification circuit, the second pole of the first control switch tube S1 is connected to the first pole of the third control switch tube S3 and the third connection terminal of the first single-phase full-bridge rectification circuit, the second pole of the second control switch tube S2 is connected to the first pole of the fourth control switch tube S4 and the fourth connection terminal of the first single-phase full-bridge rectification circuit, the second pole of the third control switch tube S3 is connected to the second pole of the fourth control switch tube S4 and the second connection terminal of the first single-phase full-bridge rectification circuit, and the control poles of the first control switch tube S1, the second control switch tube S2, the third control switch tube S3 and the fourth control switch tube S4 are configured to receive the driving signal.
Further, the first resonance compensation circuit includes an inductor L1 and a capacitor C1, the inductor L1 is connected between the first connection terminal and the third connection terminal of the first resonance compensation circuit, and the capacitor C1 is connected between the second connection terminal and the fourth connection terminal of the first resonance compensation circuit.
Further, the transformation circuit comprises a transformer, the transformer comprises a primary circuit and a secondary circuit, the primary circuit is connected with the first connecting end and the second connecting end of the transformation circuit, and the secondary circuit is connected with the third connecting end and the fourth connecting end of the transformation circuit.
According to a second aspect, an embodiment provides a bidirectional dc conversion circuit, comprising:
the first side positive connecting end and the first side negative connecting end, and at least one group of second side positive connecting end and second side negative connecting end; the first side positive connecting end and the first side negative connecting end are used for connecting a direct current charging side to receive input direct current;
the power supply comprises at least one LL C resonance transformation unit circuit, wherein each LL C resonance transformation unit circuit is correspondingly provided with a group of second side positive connecting end and second side negative connecting end, the second side positive connecting end and the second side negative connecting end are used for being connected with a load circuit or an energy storage device, and each LL C resonance transformation unit circuit comprises a first single-phase full-bridge rectifying circuit, a first resonance compensation circuit, a transformation circuit and a second single-phase full-bridge rectifying circuit;
the first single-phase full-bridge rectification circuit comprises a first connection end, a second connection end, a third connection end and a fourth connection end, and the first connection end and the second connection end of the first single-phase full-bridge rectification circuit are respectively connected with the first side positive connection end and the first side negative connection end;
the first resonance compensation circuit comprises a first connecting end, a second connecting end, a third connecting end and a fourth connecting end, and the first connecting end and the second connecting end of the first resonance compensation circuit are respectively connected with the third connecting end and the fourth connecting end of the first single-phase full-bridge rectification circuit;
the first connecting end and the second connecting end of the transformation circuit are respectively connected with the third connecting end and the fourth connecting end of the first resonance compensation circuit;
the second single-phase full-bridge rectification circuit comprises a first connecting end, a second connecting end, a third connecting end and a fourth connecting end, the first connecting end and the second connecting end of the second single-phase full-bridge rectification circuit are connected with the third connecting end and the fourth connecting end of the voltage transformation circuit, and the third connecting end and the fourth connecting end of the second single-phase full-bridge rectification circuit are respectively connected with a group of second side positive connecting ends and second side negative connecting ends corresponding to the LL C resonance transformation unit circuit.
According to the vehicle-mounted charging circuit of the embodiment, the vehicle-mounted charging circuit comprises the alternating current-direct current conversion circuit and the bidirectional direct current conversion circuit, wherein the alternating current-direct current conversion circuit is used for converting alternating current input by an alternating current power supply into direct current and outputting the direct current to the bidirectional direct current conversion circuit, the bidirectional direct current conversion circuit comprises at least one LL C resonance conversion unit circuit, each LL C resonance conversion unit circuit comprises a first single-phase full-bridge rectification circuit, a first resonance compensation circuit, a transformation circuit and a second single-phase full-bridge rectification circuit, single-side resonance compensation is carried out on the LL C resonance conversion unit circuit, so that the resonance current waveform is smoother, noise and loss of the bidirectional direct current converter can be reduced due to less current clutter, the number of resonance elements can be reduced, and the size and the heat.
Drawings
Fig. 1 is a schematic circuit diagram of a bidirectional dc converter circuit;
FIG. 2 is a schematic circuit diagram of a bidirectional DC converter circuit;
FIG. 3 is a schematic diagram of the circuit connections of the on-board charging circuit in one embodiment;
FIG. 4 is a schematic diagram of an embodiment of a bidirectional DC converter circuit;
FIG. 5 is a schematic diagram of the circuit connections of the bidirectional DC converter circuit according to an embodiment;
FIG. 6 is a schematic diagram of a circuit configuration of a bidirectional DC converter circuit according to another embodiment;
FIG. 7 is a schematic diagram of a circuit configuration of a bidirectional DC converter circuit according to another embodiment;
FIG. 8 is a schematic circuit diagram of a bidirectional DC converter circuit according to another embodiment;
FIG. 9 is a schematic diagram of a circuit configuration of a bidirectional DC converter circuit according to another embodiment;
fig. 10 is a schematic circuit diagram of a bidirectional dc converter circuit according to another embodiment;
fig. 11 is a schematic circuit diagram of a bidirectional dc converter circuit according to another embodiment;
fig. 12 is a circuit connection diagram of a bidirectional dc conversion circuit according to another embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
In the prior art, an OBC installed on an electric vehicle mainly comprises a power circuit and a control circuit, wherein the power circuit comprises an AC-DC conversion circuit and a bidirectional DC conversion circuit, the AC-DC conversion circuit comprises a rectifying circuit and a PFC circuit, the bidirectional DC conversion circuit comprises an LL C resonance compensation circuit, a LL C resonance compensation circuit meets the requirement of bidirectional DC conversion, a vehicle-mounted rechargeable battery is charged in a charging mode, electric energy is output to a load circuit end by the vehicle-mounted rechargeable battery through a LL C resonance compensation circuit in an operating mode, the electric quantity of the vehicle-mounted rechargeable battery generally needs to be more than 60KWh along with the increase of the driving range of the EV vehicle, so that the rated power of conventional 3.3kW and 6.6kW vehicle-mounted chargers cannot meet the requirement of slow charging (6 to 8 h) of the current electric vehicle at present time, refer to figure 1, the circuit structure diagram of the bidirectional DC conversion circuit is a schematic diagram of the bidirectional DC conversion circuit, the bidirectional DC conversion circuit comprises a first full-bridge rectifier circuit 10, a first full-phase direct-current compensation circuit 20, a transformation circuit 30, a second resonance compensation circuit 50 and a second direct-current compensation circuit 40, a positive full-bridge circuit and a second direct-phase direct-current conversion circuit are connected in series, the bidirectional DC conversion circuit is connected with a positive-direct-conversion circuit, the first full-voltage compensation circuit, the second direct-voltage compensation circuit, the bidirectional DC conversion circuit is used for increasing, the positive-voltage compensation circuit, the bidirectional DC conversion circuit is used for increasing problem that the positive direct-voltage compensation circuit, the positive-voltage compensation circuit and the negative direct-voltage compensation circuit is used for increasing.
In the embodiment of the invention, the vehicle-mounted charging circuit comprises an alternating current-direct current conversion circuit and a bidirectional direct current conversion circuit, wherein the alternating current-direct current conversion circuit is used for converting alternating current input by an alternating current power supply into direct current and outputting the direct current to the bidirectional direct current conversion circuit, the bidirectional direct current conversion circuit comprises at least one LL C resonance conversion unit circuit, each LL C resonance conversion unit circuit comprises a first single-phase full-bridge rectification circuit, a first resonance compensation circuit, a transformation circuit and a second single-phase full-bridge rectification circuit, and single-side resonance compensation is carried out on the LL C resonance conversion unit circuit, so that the resonance current waveform is smoother, the noise and the loss of the bidirectional direct current converter can be reduced due to less current clutter, the number of resonance elements can be reduced, and the size and the heat productivity of devices.
Example one
Referring to fig. 3, a schematic circuit connection diagram of an embodiment of a vehicle-mounted charging circuit includes an ac power supply 100, an ac-dc conversion circuit 200, a bidirectional dc conversion circuit 300, and a vehicle-mounted battery 400, where the ac-dc conversion circuit 100 includes two ac input terminals and two dc output terminals, the two ac input terminals are configured to be connected to the ac power supply 100, the two dc output terminals are configured to be connected to the bidirectional dc conversion circuit 300, the ac-dc conversion circuit 200 is configured to convert ac power input by the ac power supply 100 into dc power and output the dc power to the bidirectional dc conversion circuit 300, the bidirectional dc conversion circuit 300 includes a first side positive connection terminal and a first side negative connection terminal, and at least one set of second side positive connection terminal and second side negative connection terminal, where the first side positive connection terminal and the first side negative connection terminal are respectively connected to the two dc output terminals, and the at least one set of second side positive connection terminal and second side negative connection terminal are configured to be connected to the vehicle-mounted battery 400.
Referring to fig. 4, it is a schematic diagram of a bidirectional dc conversion circuit in an embodiment, the bidirectional dc conversion circuit includes a first side positive connection terminal and a first side negative connection terminal, and at least one set of a second side positive connection terminal and a second side negative connection terminal, wherein the first side positive connection terminal and the first side negative connection terminal are used for connecting a dc charging side to receive input dc power, the bidirectional dc conversion circuit includes at least one LL C resonant conversion unit circuit, each LL C resonant conversion unit circuit has a set of a second side positive connection terminal and a second side negative connection terminal corresponding to the set of the second side positive connection terminal and the set of the second side negative connection terminal, the second side positive connection terminal and the second side negative connection terminal are used for connecting a load circuit or an energy storage device, the LL C resonant conversion unit circuit includes a first single-phase full-bridge rectifier circuit 10, a first resonant compensation circuit 20, a transformer circuit 30 and a second single-phase rectifier circuit 40 connected in sequence, the first single-phase full-bridge rectifier circuit 10 includes a first connection terminal, a second connection terminal, a third connection terminal and a fourth full-bridge rectifier circuit 20, a fourth connection terminal for connecting the first single-phase full-bridge rectifier circuit 10 and a fourth full-bridge circuit 20, a second full-bridge circuit 20 and a fourth single-phase compensation circuit 20, a second full-bridge circuit 20 are connected to the first full-bridge circuit, a single-bridge circuit 20, a second full-bridge circuit 20, a single-bridge circuit for connecting a single-phase compensation circuit, a single-bridge circuit, a single-phase compensation circuit 20, a single-phase compensation circuit, a single-bridge circuit, a single-phase compensation circuit 30, a single-phase compensation circuit, a single-phase compensation.
Referring to fig. 5, a schematic diagram of circuit connection of a bidirectional dc conversion circuit in an embodiment is shown, wherein a first single-phase full-bridge rectifier circuit 10 includes a first control switch S, a second control switch S, a third control switch S and a fourth control switch S, a first terminal of the first control switch S and the second control switch S is connected to a first connection terminal of the first single-phase full-bridge rectifier circuit 10, a second terminal of the first control switch S and a first terminal of the third control switch S are connected to a third connection terminal of the first single-phase full-bridge rectifier circuit 10, a second terminal of the second control switch S and a first terminal of the fourth control switch S are connected to a fourth connection terminal of the first single-phase full-bridge rectifier circuit 10, a second terminal of the third control switch S and a second terminal of the fourth control switch S are connected to a second connection terminal of the first full-bridge rectifier circuit 10, a first control switch S, a second control switch S, a third control switch S and a fourth control switch S are connected to a second connection terminal of the first full-bridge rectifier circuit 10, a first control switch S, a second switch S, a third control switch S and a fourth control switch S are connected to a first control switch compensation switch 40, a second switch S and a second switch S are connected to a first control switch compensation switch C1, a second switch S is connected to a first control switch compensation switch S, a second switch S is connected to a second switch S, a second switch S is connected to a first switch S, a second switch S is connected to a second switch S, a first switch S is connected to a second switch S, a second switch S is connected to a second switch S, a first switch S, a second switch S is connected to a first switch S, a second switch S is connected to.
In the embodiment of the application, the vehicle-mounted charging circuit comprises at least one LL C resonance conversion unit circuit, each LL C resonance conversion unit circuit comprises a first single-phase full-bridge rectification circuit, a first resonance compensation circuit, a transformation circuit and a second single-phase full-bridge rectification circuit, unilateral resonance compensation is carried out on the LL C resonance conversion unit circuit, so that the waveform of resonance current is smoother, the noise and the loss of the bidirectional direct-current converter can be reduced due to less current clutter, the number of resonance elements can be reduced, and the size and the device heat productivity of the bidirectional direct-current conversion circuit can be further reduced.
Example two
Referring to fig. 6, which is a schematic diagram of a circuit structure of a bidirectional dc conversion circuit in another embodiment, the bidirectional dc conversion circuit includes two LL C resonant conversion unit circuits, that is, a first LL C resonant conversion unit circuit and a second LL C resonant conversion unit circuit, a first connection terminal and a second connection terminal of a first single-phase full-bridge rectification circuit of each LL C resonant conversion unit circuit are respectively connected to a first positive side connection terminal and a first negative side connection terminal of the bidirectional dc conversion circuit, a third connection terminal and a fourth connection terminal of a second single-phase full-bridge rectification circuit of each LL C resonant conversion unit circuit are respectively connected to a set of second positive side connection terminal and a second negative side connection terminal corresponding to a LL C resonant conversion unit circuit to which the first single-phase full-bridge rectification circuit belongs, that is connected to a first set of second positive side connection terminals and a second negative side connection terminal of the first set LL C resonant conversion unit circuit, and is used as an input or output terminal of the bidirectional dc conversion circuit, a second set of second positive side connection terminal and a second side connection terminal of the second set of the bidirectional dc conversion unit circuit is connected to a second positive side connection terminal and a second negative side connection terminal of the bidirectional dc conversion unit LL C resonant conversion unit circuit, and a set of the second side connection terminal corresponding to a set of the second single-bridge conversion unit circuit, and a set of the second positive side connection terminal of the second single-bridge conversion unit circuit are connected to a set of the positive side resonance conversion unit circuit, and a set of the bidirectional dc conversion unit circuit, and a set of the second positive side connection terminal of the bidirectional conversion unit circuit in an embodiment, and a negative side connection terminal of the bidirectional conversion unit circuit of the bidirectional conversion unit of.
In this embodiment, the bidirectional dc conversion circuit includes a plurality of LL C resonant conversion unit circuits connected in parallel, and because of the adoption of the multi-path parallel connection mode, the application of two-path and one-path output is increased while the power of the bidirectional dc conversion circuit is increased.
EXAMPLE III
Referring to fig. 7, which is a schematic diagram of a circuit structure of a bidirectional dc conversion circuit in another embodiment, the bidirectional dc conversion circuit includes a first LL C resonant conversion unit circuit 1, a second LL C resonant conversion unit circuit 2, and a switch circuit 3, the switch circuit 3 is connected to a set of second side positive connection terminal and a second side negative connection terminal corresponding to each LL C resonant conversion unit circuit, respectively, for switching between the first set of second side positive connection terminal and the second side negative connection terminal and the second set of second side positive connection terminal and the second side negative connection terminal corresponding to the first LL C resonant conversion unit circuit 1 and the second LL C resonant conversion unit circuit 2, the switch circuit 3 includes a first positive connection terminal and a first negative connection terminal, and a set of second positive connection terminal and a set of second negative connection terminal and a set of second side negative connection terminal, the first positive connection terminal and the first negative connection terminal of the switch circuit 3 are connected to the first set of second side positive connection terminal and the second side negative connection terminal corresponding to the first LL C resonant conversion unit circuit, respectively, the set of second positive connection terminal and the second side negative connection terminal corresponding to the second switch circuit 638C resonant conversion unit circuit, the switch circuit includes a set of switch circuit 9C resonant conversion unit circuit, the switch circuit 9K, the switch circuit is connected to a set of the switch circuit 9C resonant conversion unit circuit 1, the switch circuit 1, the switch circuit includes a set of the switch circuit 9K, the switch circuit includes a set of the switch circuit 9K, the switch circuit 9K, the switch circuit includes a set of the switch circuit, the switch circuit includes a set of the switch circuit.
In one embodiment, when the bidirectional direct current conversion circuit comprises n LL C resonant conversion unit circuits, the switch circuit comprises n-1 double-pole double-throw analog switches, and n is a natural number, the switch circuit is respectively connected with a group of second side positive connecting ends and a second side negative connecting ends corresponding to each LL C resonant conversion unit circuit and used for switching connection of the group of second side positive connecting ends and the group of second side negative connecting ends corresponding to the n LL C resonant conversion unit circuits, the switch circuit comprises a first positive connecting end and a first negative connecting end, and n-1 groups of second positive connecting ends and second negative connecting ends, the first positive connecting end and the first negative connecting end of the switch circuit are respectively connected with a group of second side positive connecting ends and a group of second side negative connecting ends corresponding to one LL C resonant conversion unit circuit, each group of second positive connecting ends and second negative connecting ends of the switch circuit is respectively connected with a group of second side positive connecting ends and a group of second side negative connecting ends corresponding to one LL C resonant conversion unit circuit in the other n-1C resonant conversion unit circuits, and each group of the second positive connecting ends and the second side negative connecting ends of the switch circuit are respectively connected with two groups of the first positive connecting ends and each of the second positive connecting ends of the second double-1 double-pole double-throw analog switches, and each group of the two analog switches are respectively connected.
Example four
Referring to fig. 9, a schematic diagram of a circuit structure of a bidirectional dc converter circuit in another embodiment is shown, the bidirectional dc converter circuit includes a first LL C resonant converter unit circuit 1, a second LL C resonant converter unit circuit 2, a switch circuit 3, a control circuit unit 4 and a sampling circuit unit 5, the sampling circuit unit 5 is connected to a first side positive connection terminal of the bidirectional dc converter circuit, and is further connected to a set of second side positive connection terminals corresponding to the first LL C resonant converter unit circuit 1 and the second LL C resonant converter unit circuit 2, respectively, for monitoring an electrical signal input to the bidirectional dc converter circuit, in one embodiment, the sampling circuit unit 5 monitors a voltage signal and an electrical signal input to the bidirectional dc converter circuit, to obtain an input power of the bidirectional dc converter circuit, the control circuit unit 4 is configured to obtain, according to a monitoring result of the sampling circuit unit 5, the set of second side positive connection terminals and second side negative connection terminals corresponding to the first LL C resonant converter unit circuit and the second LL C resonant converter circuit through the switch circuit 3, when the positive connection terminals and the negative connection terminals of the sampling circuit are connected to the positive connection terminals, the positive connection terminals of the positive and negative connection terminals of the positive and the negative connection terminals of the second side, the positive connection terminals of the positive and the negative connection terminals of the positive and the negative connection terminals of the positive connection terminals of the negative connection terminal are connected to the positive and the negative connection terminals of the positive connection terminal of the positive and the negative connection terminal of the positive connection terminal of the negative connection terminal of the positive current source control circuit, when the positive connection terminal of the negative current source control circuit, the negative current source control circuit is connected to the negative connection terminal of the negative current source control circuit, the negative current source control unit, the negative current source control circuit, the negative current source control unit is connected to the positive connection terminal of the.
When the input/output of the first side and the output of the second side are connected in parallel, the input/output of the second side is connected in parallel through a switch circuit, for example, a controllable element relay, for connecting the output of the second side in parallel, when the input/output of the second side is connected in parallel, the input/output of the bidirectional power conversion circuit is controlled to an interleaved control mode, the input/output of the bidirectional DC conversion circuit is reduced, and the loss of the device is reduced, the input/output of the first side, the input/output of the second side and the output of the third side are input/output ports, when the input/output of the bidirectional power conversion circuit is detected to be a power input/output port, the input/output of the bidirectional power conversion circuit is also detected to be a power input/output port, the input/output of the bidirectional power conversion circuit is detected to be a power output port, the input/output port is a power output port, the input/output of the bidirectional power conversion circuit is detected to be a power output port, the input/output port, the output port is a power output port, and the input/output port of the input/output port, the output of the parallel control unit is a power output port, the output port is a power control unit is a power output port, the output port is a power control unit is a power output port, the output port is a power control unit, the output port is a power control unit, the power control unit is a power control unit, the power control unit is a power control unit, the power control unit is a power control unit, the power control unit.
In this embodiment, the control circuit unit controls the operating mode of the bidirectional dc conversion circuit through the switch circuit according to the result of monitoring the power output of each input/output terminal of each bidirectional dc conversion circuit by the sampling circuit unit and the condition of the external circuit of each input/output terminal of the bidirectional dc conversion circuit, that is, the control of the dc conversion direction of the bidirectional dc conversion circuit is realized.
EXAMPLE five
Referring to fig. 10, a schematic diagram of a circuit structure of a bidirectional dc converter circuit in another embodiment is shown, the bidirectional dc converter circuit includes a first LL C resonant converter unit circuit 1, a second LL C resonant converter unit circuit 2, a control circuit unit 4, a sampling circuit unit 5 and a LL 0C control circuit unit 6, the sampling circuit unit 5 is connected to a first side positive connection terminal and a second side positive connection terminal of the bidirectional dc converter circuit, respectively, for monitoring an electrical signal input to the bidirectional dc converter circuit, the LL C control circuit unit 6 is connected to the first LL C resonant converter unit circuit 1 and the second LL C resonant converter unit circuit 2, for controlling a conversion direction of a bidirectional dc voltage of each LL C resonant converter unit circuit, respectively, the control circuit unit 4 is connected to the LL C control circuit unit 6 and the sampling circuit unit 5, the control circuit unit 4 is configured to monitor electrical signals at both sides of each LL C resonant converter unit circuit through the sampling circuit unit 5, and control the positive and negative side connection terminals of each LL C resonant converter unit through the LL C control circuit unit 6, when the positive and negative connection terminals of the positive and the negative connection terminals of the second side positive and the negative connection terminals of the second side are connected to the positive and the negative connection terminals of the second side, the positive and the negative connection terminals of the second side of the positive and the negative connection terminals of the second group of the positive and the negative connection terminals of the positive connection terminals of the negative connection terminals of the positive and the negative connection terminals of the positive load circuit are provided.
Referring to fig. 11, a schematic circuit structure of a bidirectional dc conversion circuit in another embodiment is shown, where the bidirectional dc conversion circuit includes n LL C resonant conversion unit circuits 1, a switch circuit 3, a control circuit unit 4, a sampling circuit unit 5, and a LL C control circuit unit 6, where n is a natural number not less than 1, n LL C resonant conversion unit circuits 1 correspond to n sets of positive side connection terminals and negative side connection terminals for respectively connecting to an energy storage device or a load, the sampling circuit unit 5 is respectively connected to the positive side connection terminals and the negative side connection terminals of the bidirectional dc conversion circuit for monitoring electrical signals input to the bidirectional dc conversion circuit, the control circuit unit 4 is configured to switch the positive side connection terminals and the negative side connection terminals of the n sets of positive side connection terminals and the negative side connection terminals corresponding to the n LL C resonant conversion unit circuits through the switch circuit 3 according to a monitoring result of the sampling circuit unit 5, and the control circuit unit 4 is further configured to control an output direction of each LL C resonant conversion unit through the LL C control circuit unit 6 according to the monitoring result of the sampling circuit unit 5.
In an embodiment of the present application, a vehicle-mounted charging circuit is further disclosed, which includes the bidirectional dc conversion circuit in the above embodiment, wherein at least one LL C resonant conversion unit circuit is connected to a vehicle-mounted battery.
In the embodiment of the application, the disclosed bidirectional direct current conversion circuit is based on the topology of the current common LL C resonance conversion circuit, the topology and the compensation method of the high-power resonance conversion circuit capable of realizing more than 22KW are provided, and meanwhile, the topology also has double-path or multi-path independent output arrangement and can supply power to different load circuits of an electric vehicle, compared with the vehicle-mounted bidirectional compensation circuit in the prior art, the bidirectional compensation circuit has the following advantages:
by adopting the unilateral compensation circuit, the waveform of the experimental resonance current is smoother, the noise and the loss of the converter can be reduced due to less current clutter, resonance setting elements can be reduced, and the size of the converter and the heating of devices can be reduced. In addition, a plurality of resonant conversion circuits of the bidirectional direct current conversion circuit adopt a mode that one side is connected with a common bus and the other side outputs two paths, so that the application of two-path and one-path output is increased while the two paths are kept in parallel to improve the power.
The application of the resonant conversion circuit topology and the compensation method is not limited to a vehicle-mounted OBC power supply, and equipment ends such as a photovoltaic cell panel, an energy storage battery and a load can be conveniently accessed in the new energy microgrid. The power grid dispatching and running are more intelligent and convenient. Meanwhile, the topology integration level is high, and distributed new energy application is facilitated.
As shown in fig. 11, the bidirectional dc conversion circuit in an embodiment of the present application may be applied to a new energy microgrid, a first side of the bidirectional dc conversion circuit may be commonly connected to a photovoltaic single board, and a second side of the bidirectional dc conversion circuit may be separately output and may be respectively connected to an energy storage battery, a dc load, or another group of energy storage batteries. The photovoltaic cell bus can be connected with the INV circuit to realize online grid connection, and when the input and output power of the photovoltaic bus is 0, the energy storage cell supplies power to the direct current load, so that multi-path output to the energy storage cell or the direct current load is realized.
Please refer to fig. 12, which is a schematic diagram of circuit connection of a bidirectional dc conversion circuit in another embodiment, and is a bidirectional dc conversion circuit topology of a 22KW vehicle OBC, wherein two LL C resonant conversion unit circuits all employ a single-side L C resonant compensation circuit, a first side of a first single-phase full-bridge rectification circuit is commonly connected to a BUS, a second side of a second single-phase full-bridge rectification circuit is commonly connected to a vehicle battery, so as to achieve a capacity expansion design, two LL C resonant conversion unit circuits perform an interleaving working mode, the BUS may be connected to a PFC/INV circuit, and a charging and inverting conversion is achieved by combining the two-side conversion circuit of this embodiment.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A vehicle-mounted charging circuit is characterized by comprising an alternating current-direct current conversion circuit and a bidirectional direct current conversion circuit;
the alternating current-direct current conversion circuit comprises two alternating current input ends and two direct current output ends, the two alternating current input ends are used for being connected with an alternating current power supply, and the two direct current output ends are used for being connected with the bidirectional direct current conversion circuit; the alternating current-direct current conversion circuit is used for converting alternating current input by the alternating current power supply into direct current and outputting the direct current to the bidirectional direct current conversion circuit;
the bidirectional DC conversion circuit includes:
the first side positive connecting end and the first side negative connecting end, and at least one group of second side positive connecting end and second side negative connecting end; the first side positive connecting end and the first side negative connecting end are respectively connected with the two direct current output ends, and at least one group of second side positive connecting end and second side negative connecting end are used for being connected with a vehicle-mounted battery;
the LL C resonant transformation unit circuit comprises a first single-phase full-bridge rectification circuit, a first resonant compensation circuit, a transformation circuit and a second single-phase full-bridge rectification circuit;
the first single-phase full-bridge rectification circuit comprises a first connection end, a second connection end, a third connection end and a fourth connection end, and the first connection end and the second connection end of the first single-phase full-bridge rectification circuit are respectively connected with the first side positive connection end and the first side negative connection end;
the first resonance compensation circuit comprises a first connecting end, a second connecting end, a third connecting end and a fourth connecting end, and the first connecting end and the second connecting end of the first resonance compensation circuit are respectively connected with the third connecting end and the fourth connecting end of the first single-phase full-bridge rectification circuit;
the first connecting end and the second connecting end of the transformation circuit are respectively connected with the third connecting end and the fourth connecting end of the first resonance compensation circuit;
the second single-phase full-bridge rectification circuit comprises a first connecting end, a second connecting end, a third connecting end and a fourth connecting end, the first connecting end and the second connecting end of the second single-phase full-bridge rectification circuit are connected with the third connecting end and the fourth connecting end of the voltage transformation circuit, and the third connecting end and the fourth connecting end of the second single-phase full-bridge rectification circuit are respectively connected with a group of second side positive connecting ends and second side negative connecting ends corresponding to the LL C resonance transformation unit circuit.
2. The vehicle-mounted charging circuit according to claim 1, wherein the LL C resonant conversion unit circuits are n in number, and n is greater than or equal to 2.
3. The vehicle-mounted charging circuit according to claim 2, wherein the bidirectional dc conversion circuit further includes a control circuit unit, an LL C control circuit unit, and a sampling circuit unit;
the sampling circuit unit is connected with the first side positive connecting end and each group of second side positive connecting ends of the bidirectional direct current conversion circuits and is used for monitoring electric signals input into the bidirectional direct current conversion circuits;
the LL C control circuit unit is connected with each LL C resonance conversion unit circuit and is used for controlling the conversion direction of the bidirectional direct-current voltage of each LL C resonance conversion unit circuit;
the control circuit unit is respectively connected with the LL C control circuit unit and the sampling circuit unit, and the control circuit unit is used for monitoring electric signals at two sides of each LL C resonance conversion unit circuit through the sampling circuit unit and controlling the conversion direction of the bidirectional direct-current voltage of each LL C resonance conversion unit circuit through the LL C control circuit unit according to a monitoring result.
4. The vehicle-mounted charging circuit according to claim 2, wherein the bidirectional dc conversion circuit further comprises a switch circuit, connected to the corresponding set of second-side positive connection terminal and second-side negative connection terminal of each LL C resonant conversion unit circuit, for switching connection between the corresponding set of second-side positive connection terminal and second-side negative connection terminal of the n LL C resonant conversion unit circuits;
the switching circuit comprises a first positive connecting end, a first negative connecting end and n-1 groups of second positive connecting ends and second negative connecting ends, wherein the first positive connecting end and the first negative connecting end of the switching circuit are respectively connected with a group of corresponding second-side positive connecting ends and second-side negative connecting ends of one LL C resonance transformation unit circuit, and each group of second positive connecting ends and second negative connecting ends of the switching circuit are respectively connected with a group of corresponding second-side positive connecting ends and second-side negative connecting ends of one LL C resonance transformation unit circuit in the other n-1 LL C resonance transformation unit circuits.
5. The on-board charging circuit of claim 4, wherein the switching circuit comprises n-1 double-pole double-throw analog switches, each of the double-pole double-throw analog switches comprising two input terminals and two output terminals; two output ends of each double-pole double-throw analog switch are respectively connected with a first positive connecting end and a first negative connecting end of the switch circuit, and two input ends of each double-pole double-throw analog switch are respectively connected with a group of second positive connecting ends and second negative connecting ends of the switch circuit.
6. The vehicle-mounted charging circuit according to claim 4, wherein the bidirectional direct current conversion circuit further includes a control circuit unit and a sampling circuit unit;
the sampling circuit unit is respectively connected with the first side positive connecting end of the bidirectional direct current conversion circuit and each group of second side positive connecting ends and is used for monitoring an electric signal input into the bidirectional direct current conversion circuit;
and the control circuit unit is used for switching and connecting each group of second side positive connecting ends and second side negative connecting ends corresponding to the n LL C resonance transformation unit circuits through the switch circuit according to the monitoring result of the sampling circuit unit.
7. The vehicle-mounted charging circuit according to any one of claims 1 to 6, wherein the first single-phase full-bridge rectification circuit comprises a first control switch tube S1, a second control switch tube S2, a third control switch tube S3 and a fourth control switch tube S4; the first poles of the first control switch tube S1 and the second control switch tube S2 are connected to the first connection terminal of the first single-phase full-bridge rectification circuit, the second pole of the first control switch tube S1 is connected to the first pole of the third control switch tube S3 and the third connection terminal of the first single-phase full-bridge rectification circuit, the second pole of the second control switch tube S2 is connected to the first pole of the fourth control switch tube S4 and the fourth connection terminal of the first single-phase full-bridge rectification circuit, the second pole of the third control switch tube S3 is connected to the second pole of the fourth control switch tube S4 and the second connection terminal of the first single-phase full-bridge rectification circuit, and the control poles of the first control switch tube S1, the second control switch tube S2, the third control switch tube S3 and the fourth control switch tube S4 are configured to receive the driving signal.
8. The vehicle charging circuit according to any one of claims 1 to 6, wherein the first resonance compensation circuit comprises an inductor L1 and a capacitor C1, the inductor L1 is connected between the first connection terminal and the third connection terminal of the first resonance compensation circuit, and the capacitor C1 is connected between the second connection terminal and the fourth connection terminal of the first resonance compensation circuit.
9. The vehicle-mounted charging circuit according to any one of claims 1 to 6, wherein the transforming circuit comprises a transformer, the transformer comprises a primary circuit and a secondary circuit, the primary circuit is connected with the first connection end and the second connection end of the transforming circuit, and the secondary circuit is connected with the third connection end and the fourth connection end of the transforming circuit.
10. A bidirectional dc conversion circuit, comprising:
the first side positive connecting end and the first side negative connecting end, and at least one group of second side positive connecting end and second side negative connecting end; the first side positive connecting end and the first side negative connecting end are used for connecting a direct current charging side to receive input direct current;
the power supply comprises at least one LL C resonance transformation unit circuit, wherein each LL C resonance transformation unit circuit is correspondingly provided with a group of second side positive connecting end and second side negative connecting end, the second side positive connecting end and the second side negative connecting end are used for being connected with a load circuit or an energy storage device, and each LL C resonance transformation unit circuit comprises a first single-phase full-bridge rectifying circuit, a first resonance compensation circuit, a transformation circuit and a second single-phase full-bridge rectifying circuit;
the first single-phase full-bridge rectification circuit comprises a first connection end, a second connection end, a third connection end and a fourth connection end, and the first connection end and the second connection end of the first single-phase full-bridge rectification circuit are respectively connected with the first side positive connection end and the first side negative connection end;
the first resonance compensation circuit comprises a first connecting end, a second connecting end, a third connecting end and a fourth connecting end, and the first connecting end and the second connecting end of the first resonance compensation circuit are respectively connected with the third connecting end and the fourth connecting end of the first single-phase full-bridge rectification circuit;
the first connecting end and the second connecting end of the transformation circuit are respectively connected with the third connecting end and the fourth connecting end of the first resonance compensation circuit;
the second single-phase full-bridge rectification circuit comprises a first connecting end, a second connecting end, a third connecting end and a fourth connecting end, the first connecting end and the second connecting end of the second single-phase full-bridge rectification circuit are connected with the third connecting end and the fourth connecting end of the voltage transformation circuit, and the third connecting end and the fourth connecting end of the second single-phase full-bridge rectification circuit are respectively connected with a group of second side positive connecting ends and second side negative connecting ends corresponding to the LL C resonance transformation unit circuit.
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