CN109367416B - Vehicle-mounted charger and electric automobile - Google Patents
Vehicle-mounted charger and electric automobile Download PDFInfo
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- CN109367416B CN109367416B CN201811142278.7A CN201811142278A CN109367416B CN 109367416 B CN109367416 B CN 109367416B CN 201811142278 A CN201811142278 A CN 201811142278A CN 109367416 B CN109367416 B CN 109367416B
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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
- 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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Abstract
The invention provides a vehicle-mounted charger and an electric automobile, and relates to the technical field of electric automobiles, wherein the vehicle-mounted charger comprises: a first conversion circuit, a second conversion circuit, and a third conversion circuit, the second conversion circuit including: one end of the primary side of the first transformer is connected with the first conversion circuit, and the other end of the primary side of the first transformer is connected with the first conversion circuit through the first inductor; one end of the secondary side of the first transformer is connected with the third conversion circuit, and the other end of the secondary side of the first transformer is connected with the third conversion circuit through the second inductor; one end of the primary side of the second transformer is connected with the first conversion circuit, and the other end of the primary side of the second transformer is connected with the first conversion circuit through the first inductor; one end of the secondary side of the second transformer is connected with the third conversion circuit, and the other end of the secondary side of the second transformer is connected with the third conversion circuit through the second inductor. According to the invention, through the connection relationship between the first transformer and the second transformer and the conversion circuit, the function of energy bidirectional transmission of the DC/DC converter can be realized, and the circuit also has a resonance function.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a vehicle-mounted charger and an electric automobile.
Background
At present, with the rapid development of electric vehicles, the electric vehicles store more and more electric energy, and the demand for using the electric vehicles as power supply equipment is more and more obvious, and a charger is required to charge a power battery and discharge the power battery. The general charger includes a Power Factor Correction (PFC) unit and a dc/dc converter, the PFC unit supports bidirectional operation, and the technology is mature, but the dc/dc converter mostly adopts a resonant circuit, which not only has high efficiency, but also has good electromagnetic Compatibility (EMC) function, but the energy of the resonant circuit can only be transmitted in one direction, and bidirectional transmission of energy cannot be realized.
Therefore, a vehicle-mounted charger and an electric vehicle are needed to solve the problem that a resonant circuit can only transmit energy in a single direction.
Disclosure of Invention
The embodiment of the invention provides a vehicle-mounted charger and an electric automobile, which are used for solving the problem that a resonant circuit can only transmit energy in a single direction.
In order to solve the technical problem, an embodiment of the present invention provides a vehicle-mounted charger, including:
a DC/DC converter, the DC/DC converter comprising:
a first conversion circuit;
a second conversion circuit connected to the first conversion circuit;
a third conversion circuit connected to the second conversion circuit;
wherein the second conversion circuit includes: the transformer comprises a first transformer, a second transformer, a first inductor and a second inductor;
one end of the primary side of the first transformer is connected with the first conversion circuit, and the other end of the primary side of the first transformer is connected with the first conversion circuit through the first inductor; one end of the secondary side of the first transformer is connected with the third conversion circuit, and the other end of the secondary side of the first transformer is connected with the third conversion circuit through the second inductor;
one end of the primary side of the second transformer is connected with the first conversion circuit, and the other end of the primary side of the second transformer is connected with the first conversion circuit through the first inductor; one end of the secondary side of the second transformer is connected with the third conversion circuit, and the other end of the secondary side of the second transformer is connected with the third conversion circuit through the second inductor.
Preferably, the vehicle-mounted charger further includes:
a power factor correction unit connected to the first conversion circuit;
and the power battery is connected with the third conversion circuit.
Preferably, the first conversion circuit includes:
the first capacitor, the third capacitor, the fifth capacitor, the first field effect transistor, the second field effect transistor, the fifth field effect transistor and the sixth field effect transistor;
the first end of the first capacitor is connected with the second end of the fifth capacitor;
the first end of the fifth capacitor is connected with the first end of the third capacitor;
the second end of the third capacitor is connected with the second end of the first capacitor;
the first end of the first field effect transistor is respectively connected with the second end of the first capacitor and the second end of the third capacitor, and the second end of the first field effect transistor is connected with the first end of the fifth field effect transistor;
a second end of the fifth field effect transistor is respectively connected with a first end of the third capacitor and a first end of the fifth capacitor;
the first end of the second field effect transistor is respectively connected with the second end of the first capacitor and the second end of the third capacitor, and the second end of the second field effect transistor is connected with the first end of the sixth field effect transistor;
and the second end of the sixth field effect transistor is respectively connected with the first end of the third capacitor and the first end of the fifth capacitor.
Preferably, the third conversion circuit includes:
the second capacitor, the fourth capacitor, the sixth capacitor, the third field effect transistor, the fourth field effect transistor, the seventh field effect transistor and the eighth field effect transistor;
the first end of the second capacitor is connected with the second end of the sixth capacitor;
the first end of the sixth capacitor is connected with the first end of the fourth capacitor;
a second end of the fourth capacitor is connected with a second end of the second capacitor;
a first end of the fourth field effect transistor is respectively connected with a second end of the second capacitor and a second end of the fourth capacitor, and a second end of the fourth field effect transistor is connected with a first end of the eighth field effect transistor;
a second end of the eighth field effect transistor is respectively connected with a first end of the fourth capacitor and a first end of the sixth capacitor;
the first end of the third field effect transistor is respectively connected with the second end of the second capacitor and the second end of the fourth capacitor, and the second end of the third field effect transistor is connected with the first end of the seventh field effect transistor;
and the second end of the seventh field effect transistor is respectively connected with the first end of the fourth capacitor and the first end of the sixth capacitor.
Preferably, in the second conversion circuit, a dotted terminal of a primary side of the first transformer is connected to the second terminal of the first field-effect transistor and the first terminal of the fifth field-effect transistor, a dotted terminal of a primary side of the first transformer is connected to the dotted terminal of the primary side of the second transformer and the dotted terminal of the first inductor, and a dotted terminal of the first inductor is connected to the first terminal of the first capacitor and the second terminal of the fifth capacitor;
the homonymous end of the secondary side of the first transformer is connected with the second end of the fourth field effect transistor and the first end of the eighth field effect transistor respectively, and the heteronymous end of the secondary side of the first transformer is connected with the heteronymous end of the secondary side of the second transformer and the homonymous end of the second inductor respectively;
the synonym end of the second inductor is respectively connected with the first end of the second capacitor and the second end of the sixth capacitor;
the synonym end of the primary side of the second transformer is respectively connected with the second end of the second field effect transistor and the first end of the sixth field effect transistor, and the synonym end of the secondary side of the second transformer is respectively connected with the second end of the third field effect transistor and the first end of the seventh field effect transistor.
Preferably, the power factor correction unit is connected to the first terminal and the second terminal of the third capacitor, respectively.
Preferably, the power battery is respectively connected with the first end and the second end of the fourth capacitor.
Preferably, the first field effect transistor, the second field effect transistor, the third field effect transistor, the fourth field effect transistor, the fifth field effect transistor, the sixth field effect transistor, the seventh field effect transistor, and the eighth field effect transistor are switching transistors or diodes.
The embodiment of the invention also provides an electric automobile, which comprises an automobile body and further comprises: the vehicle-mounted charger is as described above;
the vehicle-mounted charger is arranged inside the vehicle body.
Compared with the prior art, the vehicle-mounted charger and the electric automobile provided by the embodiment of the invention at least have the following beneficial effects:
one end of the primary side of the first transformer is connected with the first conversion circuit, and the other end of the primary side of the first transformer is connected with the first conversion circuit through the first inductor; one end of the secondary side of the first transformer is connected with the third conversion circuit, and the other end of the secondary side of the first transformer is connected with the third conversion circuit through the second inductor; one end of the primary side of the second transformer is connected with the first conversion circuit, and the other end of the primary side of the second transformer is connected with the first conversion circuit through the first inductor; one end of the secondary side of the second transformer is connected with the third conversion circuit, and the other end of the secondary side of the second transformer is connected with the third conversion circuit through the second inductor, so that the function of energy bidirectional transmission of the direct current/direct current converter can be realized, and the circuit also has a resonance function.
Drawings
Fig. 1 is a circuit connection diagram of a vehicle-mounted charger according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a DC/DC converter according to an embodiment of the present invention;
description of reference numerals:
1-DC/DC converter, T1-first transformer, T2-second transformer, L1-first inductor, L2-second inductor, 2-power factor correction unit, 3-power battery, C1-first capacitor, C2-second capacitor, C3-third capacitor, C4-fourth capacitor, C5-fifth capacitor, C6-sixth capacitor, Q1-first field effect transistor, Q2-second field effect transistor, Q3-third field effect transistor, Q4-fourth field effect transistor, Q5-fifth field effect transistor, Q6-sixth field effect transistor, Q7-seventh field effect transistor, and Q8-eighth field effect transistor.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the full understanding of the embodiments of the present invention. Thus, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
An embodiment of the present invention provides a vehicle-mounted charger, as shown in fig. 1 and 2, including:
a dc/dc converter 1, the dc/dc converter 1 comprising:
a first conversion circuit;
a second conversion circuit connected to the first conversion circuit;
a third conversion circuit connected to the second conversion circuit;
wherein the second conversion circuit includes: a first transformer T1, a second transformer T2, a first inductor L1 and a second inductor L2;
one end of the primary side of the first transformer T1 is connected with the first conversion circuit, and the other end of the primary side of the first transformer T1 is connected with the first conversion circuit through the first inductor L1; one end of the secondary side of the first transformer T1 is connected to the third conversion circuit, and the other end is connected to the third conversion circuit through the second inductor L2;
one end of the primary side of the second transformer T2 is connected with the first conversion circuit, and the other end of the primary side of the second transformer T2 is connected with the first conversion circuit through the first inductor L1; one end of the secondary side of the second transformer T2 is connected to the third conversion circuit, and the other end is connected to the third conversion circuit through the second inductor L2.
In the above embodiment of the present invention, one end of the primary side of the first transformer T1 is connected to the first converting circuit, and the other end of the primary side of the first transformer T1 is connected to the first converting circuit through the first inductor L1; one end of the secondary side of the first transformer T1 is connected to the third conversion circuit, and the other end is connected to the third conversion circuit through the second inductor L2; one end of the primary side of the second transformer T2 is connected to the first conversion circuit, and the other end is connected to the first conversion circuit through the first inductor L1; one end of the secondary side of the second transformer T2 is connected to the third converting circuit, and the other end is connected to the third converting circuit through the second inductor L2, so that the function of energy bidirectional transmission of the dc/dc converter 1 can be realized, and the circuit also has a resonance function.
In a specific embodiment of the present invention, as shown in fig. 1 and fig. 2, the vehicle-mounted charger further includes:
a power factor correction unit 2 connected to the first conversion circuit;
and the power battery 3 is connected with the third conversion circuit.
In an embodiment of the present invention, as shown in fig. 2, the first converting circuit includes:
the first capacitor C1, the third capacitor C3, the fifth capacitor C5, the first field effect transistor Q1, the second field effect transistor Q2, the fifth field effect transistor Q5 and the sixth field effect transistor Q6;
a first terminal of the first capacitor C1 is connected with a second terminal of the fifth capacitor C5;
a first terminal of the fifth capacitor C5 is connected with a first terminal of the third capacitor C3;
a second terminal of the third capacitor C3 is connected with a second terminal of the first capacitor C1;
a first terminal of the first fet Q1 is connected to the second terminal of the first capacitor C1 and the second terminal of the third capacitor C3, respectively, and a second terminal of the first fet Q1 is connected to the first terminal of the fifth fet Q5;
a second terminal of the fifth field effect transistor Q5 is respectively connected with the first terminal of the third capacitor C3 and the first terminal of the fifth capacitor C5;
a first terminal of the second fet Q2 is connected to the second terminal of the first capacitor C1 and the second terminal of the third capacitor C3, respectively, and a second terminal of the second fet Q2 is connected to the first terminal of the sixth fet Q6;
a second terminal of the sixth fet Q6 is connected to the first terminal of the third capacitor C3 and the first terminal of the fifth capacitor C5, respectively.
In an embodiment of the invention, as shown in fig. 2, the third converting circuit includes:
a second capacitor C2, a fourth capacitor C4, a sixth capacitor C6, a third fet Q3, a fourth fet Q4, a seventh fet Q7, and an eighth fet Q8;
a first terminal of the second capacitor C2 is connected with a second terminal of the sixth capacitor C6;
a first terminal of the sixth capacitor C6 is connected with a first terminal of the fourth capacitor C4;
a second terminal of the fourth capacitor C4 is connected with a second terminal of the second capacitor C2;
a first terminal of the fourth fet Q4 is connected to the second terminal of the second capacitor C2 and the second terminal of the fourth capacitor C4, respectively, and a second terminal of the fourth fet Q4 is connected to the first terminal of the eighth fet Q8;
a second terminal of the eighth fet Q8 is connected to the first terminal of the fourth capacitor C4 and the first terminal of the sixth capacitor C6, respectively;
a first terminal of the third fet Q3 is connected to the second terminal of the second capacitor C2 and the second terminal of the fourth capacitor C4, respectively, and a second terminal of the third fet Q3 is connected to the first terminal of the seventh fet Q7;
a second terminal of the seventh fet Q7 is connected to the first terminal of the fourth capacitor C4 and the first terminal of the sixth capacitor C6, respectively.
In a specific embodiment of the present invention, as shown in fig. 2, in the second conversion circuit, a dotted terminal of a primary side of the first transformer T1 is connected to the second terminal of the first fet Q1 and the first terminal of the fifth fet Q5, a dotted terminal of a primary side of the first transformer T1 is connected to the dotted terminal of the primary side of the second transformer T2 and the dotted terminal of the first inductor L1, and a dotted terminal of the first inductor L1 is connected to the first terminal of the first capacitor C1 and the second terminal of the fifth capacitor C5;
a dotted terminal of a secondary side of the first transformer T1 is connected to the second terminal of the fourth fet Q4 and the first terminal of the eighth fet Q8, respectively, and a dotted terminal of a secondary side of the first transformer T1 is connected to a dotted terminal of a secondary side of the second transformer T2 and the dotted terminal of the second inductor L2, respectively;
the synonym terminal of the second inductor L2 is respectively connected with the first terminal of the second capacitor C2 and the second terminal of the sixth capacitor C6;
the synonym end of the primary side of the second transformer T2 is connected to the second end of the second fet Q2 and the first end of the sixth fet Q6, respectively, and the synonym end of the secondary side of the second transformer T2 is connected to the second end of the third fet Q3 and the first end of the seventh fet Q7, respectively.
In an embodiment of the present invention, as shown in fig. 2, the pfc unit 2 is respectively connected to the first terminal and the second terminal of the third capacitor C3. The power factor refers to a relationship between the effective power and the total power consumption (apparent power), that is, a ratio of the effective power divided by the total power consumption (apparent power). The power factor is a parameter for measuring the power efficiency of the electric equipment, and the low power factor represents the low power efficiency. A technique for increasing the power factor of a powered device is known as power factor correction.
In an embodiment of the present invention, as shown in fig. 1 and fig. 2, the power battery 3 is connected to the first terminal and the second terminal of the fourth capacitor C4, respectively.
In an embodiment of the invention, the first fet Q1, the second fet Q2, the third fet Q3, the fourth fet Q4, the fifth fet Q5, the sixth fet Q6, the seventh fet Q7, and the eighth fet Q8 are switching transistors or diodes. Wherein the first fet Q1, the second fet Q2, the third fet Q3, the fourth fet Q4, the fifth fet Q5, the sixth fet Q6, the seventh fet Q7, and the eighth fet Q8 are mos transistors, and the mos transistors are metal-oxide-semiconductor (semiconductor) fets.
When the first fet Q1, the second fet Q2, the fifth fet Q5, and the sixth fet Q6 are used as switching tubes, the third fet Q3, the fourth fet Q4, the seventh fet Q7, and the eighth fet Q8 are used as diodes, the first inductor L1, the first capacitor C1, and the fifth capacitor C5 operate in a resonant state, energy flows from the third capacitor C3 to the fourth capacitor C4, at this time, the left side of the first transformer T1 is a primary side, the right side of the first transformer T2 is a secondary side, and the left side of the second transformer T2 is a primary side, and the right side of the second transformer T2 is a secondary side; the specific flow process is as follows:
when the first fet Q1 and the second fet Q2 are turned on and the fifth fet Q5 and the sixth fet Q6 are turned off, a resonant current flows: from the second terminal of the third capacitor C3 to the first terminal (i.e., terminal a) of the first fet Q1 to the second terminal (i.e., terminal b) of the first fet Q1 to the dotted terminal (i.e., terminal s 1) of the primary side of the first transformer T1 to the dotted terminal (i.e., terminal s 2) of the primary side of the first transformer T1 to the dotted terminal of the first inductor L1 to the dotted terminal of the first inductor L1 to the first terminal of the first capacitor C1 and the second terminal of the fifth capacitor C5; when a current flows to the dotted terminal (i.e., the terminal s 1) of the primary side of the first transformer T1, the current flows from the different-name terminal (i.e., the terminal s 3) of the secondary side of the first transformer T1 to the dotted terminal (i.e., the terminal s 4) of the secondary side of the first transformer T1 to the second terminal (i.e., the terminal h) of the fourth fet Q4 to the first terminal (i.e., the terminal g) of the fourth fet Q4 to the second terminal (i.e., the terminal g) of the fourth capacitor C4 (i.e., the fourth capacitor C4 is charged), flows to the first terminal of the fourth capacitor C4 to the second terminal (i.e., the terminal o) of the seventh fet Q7 to the first terminal (i.e., the terminal n) of the seventh fet Q7 to the dotted terminal (i.e., the terminal s 8) of the secondary side of the second transformer T2; the resonant current flows to: from the second terminal of the third capacitor C3 to the first terminal (i.e., terminal C) of the second fet Q2 to the second terminal (i.e., terminal d) of the second fet Q2 to the synonym terminal (i.e., terminal s 6) of the primary side of the second transformer T2 to the synonym terminal (i.e., terminal s 5) of the primary side of the second transformer T2 to the synonym terminal of the first inductor L1 to the synonym terminal of the first inductor L1 to the first terminal of the first capacitor C1 and the second terminal of the fifth capacitor C5; when current flows to the synonym terminal (i.e., the terminal s 6) of the primary side of the second transformer T2, the current flows from the synonym terminal (i.e., the terminal s 8) of the secondary side of the second transformer T2 to the synonym terminal (i.e., the terminal s 7) of the secondary side of the second transformer T2 to the synonym terminal (i.e., the terminal s 3) of the secondary side of the first transformer T1, so that a loop is formed, and the second inductor L2, the second capacitor C2 and the sixth capacitor C6 can be bypassed.
When the first fet Q1 and the second fet Q2 are turned off and the fifth fet Q5 and the sixth fet Q6 are turned on, a resonant current flows: from the first terminal of the third capacitor C3 to the second terminal (i.e., j terminal) of the fifth fet Q5 to the first terminal (i.e., i terminal) of the fifth fet Q5 to the dotted terminal (i.e., s1 terminal) of the primary side of the first transformer T1 to the dotted terminal (i.e., s2 terminal) of the primary side of the first transformer T1 to the dotted terminal of the first inductor L1 to the dotted terminal of the first inductor L1 to the first terminal of the first capacitor C1 and the second terminal of the fifth capacitor C5; when a current flows to the dotted terminal (i.e., the terminal s 1) of the primary side of the first transformer T1, the current flows from the different-name terminal (i.e., the terminal s 3) of the secondary side of the first transformer T1 to the dotted terminal (i.e., the terminal s 4) of the secondary side of the first transformer T1 to the second terminal (i.e., the terminal h) of the fourth fet Q4 to the first terminal (i.e., the terminal g) of the fourth fet Q4 to the second terminal (i.e., the terminal g) of the fourth capacitor C4 (i.e., the fourth capacitor C4 is charged), flows to the first terminal of the fourth capacitor C4 to the second terminal (i.e., the terminal o) of the seventh fet Q7 to the first terminal (i.e., the terminal n) of the seventh fet Q7 to the dotted terminal (i.e., the terminal s 8) of the secondary side of the second transformer T2; the resonant current flows to: from the first terminal of the third capacitor C3 to the second terminal (i.e., terminal m) of the sixth fet Q6 to the first terminal (i.e., terminal k) of the sixth fet Q6 to the synonym terminal (i.e., terminal s 6) of the primary side of the second transformer T2 to the synonym terminal (i.e., terminal s 5) of the primary side of the second transformer T2 to the synonym terminal of the first inductor L1 to the synonym terminal of the first inductor L1 to the first terminal of the first capacitor C1 and the second terminal of the fifth capacitor C5; when current flows to the synonym terminal (i.e., the terminal s 6) of the primary side of the second transformer T2, the current flows from the synonym terminal (i.e., the terminal s 8) of the secondary side of the second transformer T2 to the synonym terminal (i.e., the terminal s 7) of the secondary side of the second transformer T2 to the synonym terminal (i.e., the terminal s 3) of the secondary side of the first transformer T1, so that a loop is formed, and the second inductor L2, the second capacitor C2 and the sixth capacitor C6 can be bypassed.
When the first fet Q1, the second fet Q2, the fifth fet Q5, and the sixth fet Q6 are used as diodes, the third fet Q3, the fourth fet Q4, the seventh fet Q7, and the eighth fet Q8 are used as switching tubes, the second inductor L2, the second capacitor C2, and the sixth capacitor C6 operate in a resonant state, energy flows from the fourth capacitor C4 toward the third capacitor C3, at this time, the right side of the first transformer T1 is a primary side, the left side is a secondary side, the right side of the second transformer T2 is a primary side, and the left side is a secondary side; the specific flow process is as follows:
when the third fet Q3 and the fourth fet Q4 are turned on and the seventh fet Q7 and the eighth fet Q8 are turned off, a resonant current flows: from the second terminal of the fourth capacitor C4 to the first terminal (i.e., terminal g) of the fourth fet Q4 to the second terminal (i.e., terminal h) of the fourth fet Q4 to the dotted terminal (i.e., terminal s 4) of the primary side of the first transformer T1 to the dotted terminal (i.e., terminal s 3) of the primary side of the first transformer T1 to the dotted terminal of the second inductor L2 to the dotted terminal of the second inductor L2 to the first terminal of the second capacitor C2 and the second terminal of the sixth capacitor C6; when the current flows to the dotted terminal (i.e., the terminal s 4) of the primary side of the first transformer T1, the current flows from the dotted terminal (i.e., the terminal s 2) of the secondary side of the first transformer T1 to the dotted terminal (i.e., the terminal s 1) of the secondary side of the first transformer T1 to the second terminal (i.e., the terminal b) of the first fet Q1 to the first terminal (i.e., the terminal a) of the first fet Q1 to the second terminal (i.e., the terminal a) of the third capacitor C3 (i.e., the third capacitor C3 is charged), flows to the first terminal (i.e., the terminal m) of the third capacitor C3 to the second terminal (i.e., the terminal m) of the sixth fet Q6 to the first terminal (i.e., the terminal k) of the sixth fet 35q 6 to the dotted terminal (i.e., the terminal s 6) of the secondary side of the second transformer T2; the resonant current flows to: from the second terminal of the fourth capacitor C4 to the first terminal (i.e., terminal e) of the third fet Q3 to the second terminal (i.e., terminal f) of the third fet Q3 to the dotted terminal (i.e., terminal s 8) of the primary side of the second transformer T2 to the dotted terminal (i.e., terminal s 7) of the primary side of the second transformer T2 to the dotted terminal of the second inductor L2 to the dotted terminal of the second inductor L2 to the first terminal of the second capacitor C2 and the second terminal of the sixth capacitor C6; when the current flows to the dotted terminal (i.e., the terminal s 8) of the primary side of the second transformer T2, the current flows from the dotted terminal (i.e., the terminal s 6) of the secondary side of the second transformer T2 to the dotted terminal (i.e., the terminal s 5) of the secondary side of the second transformer T2 to the dotted terminal (i.e., the terminal s 2) of the secondary side of the first transformer T1, so that a loop is formed, and the first inductor L1, the first capacitor C1 and the fifth capacitor C5 can be bypassed.
When the third fet Q3 and the fourth fet Q4 are turned off and the seventh fet Q7 and the eighth fet Q8 are turned on, a resonant current flows: from the first terminal of the fourth capacitor C4 to the second terminal (i.e., Q terminal) of the eighth fet Q8 to the first terminal (i.e., p terminal) of the eighth fet Q8 to the dotted terminal (i.e., s4 terminal) of the primary side of the first transformer T1 to the dotted terminal (i.e., s3 terminal) of the primary side of the first transformer T1 to the dotted terminal of the second inductor L2 to the dotted terminal of the second inductor L2 to the first terminal of the second capacitor C2 and the second terminal of the sixth capacitor C6; when the current flows to the dotted terminal (i.e., the terminal s 4) of the primary side of the first transformer T1, the current flows from the dotted terminal (i.e., the terminal s 2) of the secondary side of the first transformer T1 to the dotted terminal (i.e., the terminal s 1) of the secondary side of the first transformer T1 to the second terminal (i.e., the terminal b) of the first fet Q1 to the first terminal (i.e., the terminal a) of the first fet Q1 to the second terminal (i.e., the terminal a) of the third capacitor C3 (i.e., the third capacitor C3 is charged), flows to the first terminal (i.e., the terminal m) of the third capacitor C3 to the second terminal (i.e., the terminal m) of the sixth fet Q6 to the first terminal (i.e., the terminal k) of the sixth fet 35q 6 to the dotted terminal (i.e., the terminal s 6) of the secondary side of the second transformer T2; the resonant current flows to: from the first terminal of the fourth capacitor C4 to the second terminal (i.e., the o terminal) of the seventh fet Q7 to the first terminal (i.e., the n terminal) of the seventh fet Q7 to the dotted terminal (i.e., the s8 terminal) of the primary side of the second transformer T2 to the dotted terminal (i.e., the s7 terminal) of the primary side of the second transformer T2 to the dotted terminal of the second inductor L2 to the dotted terminal of the second inductor L2 to the first terminal of the second capacitor C2 and the second terminal of the sixth capacitor C6; when the current flows to the dotted terminal (i.e., the terminal s 8) of the primary side of the second transformer T2, the current flows from the dotted terminal (i.e., the terminal s 6) of the secondary side of the second transformer T2 to the dotted terminal (i.e., the terminal s 5) of the secondary side of the second transformer T2 to the dotted terminal (i.e., the terminal s 2) of the secondary side of the first transformer T1, so that a loop is formed, and the first inductor L1, the first capacitor C1 and the fifth capacitor C5 can be bypassed.
The primary side of the first transformer T1 and the secondary side of the second transformer T2 are input sides of the voltage, and the secondary side of the voltage is an output side of the voltage converted by the transformers. For a step-up transformer, the primary side is the low-voltage side, and the secondary side is the high-voltage side; for a step-down transformer, the primary side is the high-voltage side and the secondary side is the low-voltage side. The black points of the first transformer T1 and the second transformer T2 are identified as dotted terminals, the dotted terminals are primary terminals in which current flows (flows), and secondary terminals in which current flows (flows), and the directions of the currents are not the same.
The embodiment of the invention also provides an electric automobile, which comprises an automobile body and further comprises: the vehicle-mounted charger according to any one of the embodiments;
the vehicle-mounted charger is arranged inside the vehicle body.
In the embodiment of the present invention, one end of the primary side of the first transformer T1 is connected to the first converting circuit, and the other end of the primary side of the first transformer T1 is connected to the first converting circuit through the first inductor L1; one end of the secondary side of the first transformer T1 is connected to the third conversion circuit, and the other end is connected to the third conversion circuit through the second inductor L2; one end of the primary side of the second transformer T2 is connected to the first conversion circuit, and the other end is connected to the first conversion circuit through the first inductor L1; one end of the secondary side of the second transformer T2 is connected to the third converting circuit, and the other end is connected to the third converting circuit through the second inductor L2, so that the function of energy bidirectional transmission of the dc/dc converter 1 can be realized, and the circuit also has a resonance function and electromagnetic compatibility.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The utility model provides a vehicle-mounted charger which characterized in that includes:
a dc/dc converter (1), the dc/dc converter (1) comprising:
a first conversion circuit;
a second conversion circuit connected to the first conversion circuit;
a third conversion circuit connected to the second conversion circuit;
wherein the second conversion circuit includes: a first transformer (T1), a second transformer (T2), a first inductor (L1) and a second inductor (L2);
one end of the primary side of the first transformer (T1) is connected with the first conversion circuit, and the other end of the primary side of the first transformer (T1) is connected with the first conversion circuit through the first inductor (L1); one end of a secondary side of the first transformer (T1) is connected with the third conversion circuit, and the other end of the secondary side of the first transformer (T1) is connected with the third conversion circuit through the second inductor (L2);
one end of the primary side of the second transformer (T2) is connected with the first conversion circuit, and the other end of the primary side of the second transformer (T2) is connected with the first conversion circuit through the first inductor (L1); one end of a secondary side of the second transformer (T2) is connected with the third conversion circuit, and the other end of the secondary side of the second transformer (T2) is connected with the third conversion circuit through the second inductor (L2);
wherein the first conversion circuit includes:
the circuit comprises a first capacitor (C1), a third capacitor (C3), a fifth capacitor (C5), a first field effect transistor (Q1), a second field effect transistor (Q2), a fifth field effect transistor (Q5) and a sixth field effect transistor (Q6);
a first terminal of the first capacitor (C1) is connected with a second terminal of the fifth capacitor (C5);
a first terminal of the fifth capacitance (C5) is connected with a first terminal of the third capacitance (C3);
a second terminal of the third capacitance (C3) is connected with a second terminal of the first capacitance (C1);
a first terminal of the first field effect transistor (Q1) is respectively connected with a second terminal of the first capacitor (C1) and a second terminal of a third capacitor (C3), and a second terminal of the first field effect transistor (Q1) is connected with a first terminal of the fifth field effect transistor (Q5);
a second terminal of the fifth field effect transistor (Q5) is connected to a first terminal of the third capacitor (C3) and a first terminal of the fifth capacitor (C5), respectively;
a first terminal of the second field effect transistor (Q2) is respectively connected with a second terminal of the first capacitor (C1) and a second terminal of a third capacitor (C3), and a second terminal of the second field effect transistor (Q2) is connected with a first terminal of the sixth field effect transistor (Q6);
a second terminal of the sixth field effect transistor (Q6) is connected to a first terminal of the third capacitor (C3) and a first terminal of the fifth capacitor (C5), respectively.
2. The vehicle-mounted charger according to claim 1, characterized in that it further comprises:
a power factor correction unit (2) connected to the first conversion circuit;
and the power battery (3) is connected with the third conversion circuit.
3. The vehicle-mounted charger according to claim 2, characterized in that said third conversion circuit comprises:
a second capacitor (C2), a fourth capacitor (C4), a sixth capacitor (C6), a third field effect transistor (Q3), a fourth field effect transistor (Q4), a seventh field effect transistor (Q7) and an eighth field effect transistor (Q8);
a first terminal of the second capacitor (C2) is connected with a second terminal of the sixth capacitor (C6);
a first terminal of the sixth capacitance (C6) is connected with a first terminal of the fourth capacitance (C4);
a second terminal of the fourth capacitance (C4) is connected with a second terminal of the second capacitance (C2);
a first terminal of the fourth field effect transistor (Q4) is respectively connected with a second terminal of the second capacitor (C2) and a second terminal of a fourth capacitor (C4), and a second terminal of the fourth field effect transistor (Q4) is connected with a first terminal of the eighth field effect transistor (Q8);
a second terminal of the eighth field effect transistor (Q8) is connected to a first terminal of the fourth capacitor (C4) and a first terminal of the sixth capacitor (C6), respectively;
a first terminal of the third field effect transistor (Q3) is respectively connected with a second terminal of the second capacitor (C2) and a second terminal of a fourth capacitor (C4), and a second terminal of the third field effect transistor (Q3) is connected with a first terminal of the seventh field effect transistor (Q7);
a second terminal of the seventh field effect transistor (Q7) is connected to a first terminal of the fourth capacitor (C4) and a first terminal of the sixth capacitor (C6), respectively.
4. The vehicle-mounted charger according to claim 3, characterized in that in said second conversion circuit, the dotted terminal of the primary side of said first transformer (T1) is connected to the second terminal of said first FET (Q1) and the first terminal of said fifth FET (Q5), respectively, the dotted terminal of the primary side of said first transformer (T1) is connected to the dotted terminal of the primary side of said second transformer (T2) and the dotted terminal of said first inductor (L1), respectively, and the dotted terminal of said first inductor (L1) is connected to the first terminal of said first capacitor (C1) and the second terminal of said fifth capacitor (C5), respectively;
the dotted terminal of the secondary side of the first transformer (T1) is connected to the second terminal of the fourth fet (Q4) and the first terminal of the eighth fet (Q8), respectively, and the dotted terminal of the secondary side of the first transformer (T1) is connected to the dotted terminal of the secondary side of the second transformer (T2) and the dotted terminal of the second inductor (L2), respectively;
the synonym terminal of the second inductor (L2) is respectively connected with the first terminal of the second capacitor (C2) and the second terminal of the sixth capacitor (C6);
the synonym end of the primary side of the second transformer (T2) is respectively connected with the second end of the second field effect transistor (Q2) and the first end of the sixth field effect transistor (Q6), and the synonym end of the secondary side of the second transformer (T2) is respectively connected with the second end of the third field effect transistor (Q3) and the first end of the seventh field effect transistor (Q7).
5. The vehicle-mounted charger according to claim 2, characterized in that said power factor correction unit (2) is connected to the first and second terminals of said third capacitor (C3), respectively.
6. The vehicle-mounted charger according to claim 3, characterized in that said power battery (3) is connected to a first end and a second end of said fourth capacitor (C4), respectively.
7. The vehicle-mounted charger according to claim 3, characterized in that said first field effect transistor (Q1), said second field effect transistor (Q2), said third field effect transistor (Q3), said fourth field effect transistor (Q4), said fifth field effect transistor (Q5), said sixth field effect transistor (Q6), said seventh field effect transistor (Q7) and said eighth field effect transistor (Q8) are switching transistors or diodes.
8. The electric automobile is characterized by comprising an automobile body and further comprising: the vehicle-mounted charger according to any one of claims 1 to 7;
the vehicle-mounted charger is arranged inside the vehicle body.
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| CN201811142278.7A CN109367416B (en) | 2018-09-28 | 2018-09-28 | Vehicle-mounted charger and electric automobile |
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|---|---|---|---|---|
| EP2418763A2 (en) * | 2010-08-09 | 2012-02-15 | OMRON Automotive Electronics Co., Ltd. | DC-DC converter |
| CN106936184A (en) * | 2017-03-14 | 2017-07-07 | 深圳威迈斯电源有限公司 | A kind of integrated circuit of Vehicular charger and DCDC |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025281B (en) * | 2009-09-15 | 2012-12-12 | 南京理工大学 | Cuk-converter-based high-frequency isolated three-level alternating current (AC)-AC converter |
| JP5630409B2 (en) * | 2011-09-21 | 2014-11-26 | シャープ株式会社 | Push-pull circuit, DC / DC converter, solar charging system, and moving body |
| CN206099475U (en) * | 2016-10-25 | 2017-04-12 | 深圳欣锐科技股份有限公司 | On -vehicle machine and direct -current converter integrated control ware circuit of charging |
| CN106787769A (en) * | 2017-02-24 | 2017-05-31 | 北京新能源汽车股份有限公司 | A kind of two-way full-bridge LLC translation circuits and automobile |
| CN107888074B (en) * | 2017-11-17 | 2020-11-17 | 杭州电子科技大学 | Bidirectional LLC resonant DC-DC converter |
| CN108312889B (en) * | 2018-04-25 | 2024-01-09 | 苏州市万松电气有限公司 | High-power high-efficiency bidirectional charger for subway vehicle |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2418763A2 (en) * | 2010-08-09 | 2012-02-15 | OMRON Automotive Electronics Co., Ltd. | DC-DC converter |
| CN106936184A (en) * | 2017-03-14 | 2017-07-07 | 深圳威迈斯电源有限公司 | A kind of integrated circuit of Vehicular charger and DCDC |
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