CN112996688A - Three-phase charging and single-phase charging mutual switching circuit and related device - Google Patents
Three-phase charging and single-phase charging mutual switching circuit and related device Download PDFInfo
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- CN112996688A CN112996688A CN202080005898.5A CN202080005898A CN112996688A CN 112996688 A CN112996688 A CN 112996688A CN 202080005898 A CN202080005898 A CN 202080005898A CN 112996688 A CN112996688 A CN 112996688A
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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
- B60L53/24—Using the vehicle's propulsion converter for charging
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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
Abstract
The embodiment of the application provides a three-phase charging and single-phase charging mutual switching circuit and a related device, wherein the three-phase charging and single-phase charging mutual switching circuit comprises an alternating current input end, a single-pole double-throw switch, a first bridge arm, a second bridge arm, a third bridge arm and a charging circuit, and the alternating current input end comprises a first interface, a second interface, a third interface and a fourth interface; the first bridge arm, the second bridge arm and the third bridge arm are connected in parallel, and the first bridge arm, the second bridge arm and the third bridge arm are respectively connected with the charging circuit; the first interface is connected with the first bridge arm, the second interface is connected with the second bridge arm, the third interface is connected with the third bridge arm through a normally closed contact of the single-pole double-throw switch, and the fourth interface is connected with the third bridge arm through a normally open contact of the single-pole double-throw switch; the compatible three-phase voltage charging and single-phase voltage charging functions can be realized only by one set of circuit.
Description
Technical Field
The application relates to the technical field of electronic circuits, in particular to a three-phase charging and single-phase charging mutual switching circuit and a related device.
Background
Along with the improvement of the requirement of people on the endurance mileage of the electric automobile, the technical requirement of the charging speed of the electric automobile is also improved. In order to increase the charging speed of the electric automobile and reduce the charging time, the charger is switched from an initial single-phase charger to a three-phase charger step by step. However, not all charging occasions can provide three-phase power, and therefore, the electric vehicle needs a function of compatible three-phase voltage charging and single-phase voltage charging.
In the prior art, two sets of charging devices are arranged in an electric automobile, namely a single-phase charger and a three-phase charger are arranged at the same time, so that the function that the electric automobile can be charged by three-phase voltage and can be compatible with single-phase voltage is realized, and the problems of complex charging circuit structure, high cost, high control difficulty and the like exist.
Content of application
The embodiment of the application provides a three-phase charging and single-phase charging mutual switching circuit and relevant device, can realize that three-phase charging and single-phase charging are switched over each other, only need be equipped with one set of circuit and can realize compatible three-phase voltage and single-phase voltage charging function to be favorable to reducing circuit structure complexity, circuit cost and circuit control degree of difficulty.
In a first aspect of the embodiments of the present application, a three-phase charging and single-phase charging mutual switching circuit is provided, and includes an ac input end, a single-pole double-throw switch, a first bridge arm, a second bridge arm, a third bridge arm, and a charging circuit, where the ac input end includes a first interface, a second interface, a third interface, and a fourth interface;
the first bridge arm, the second bridge arm and the third bridge arm are connected in parallel, and the first bridge arm, the second bridge arm and the third bridge arm are respectively connected with the charging circuit; the first interface is connected with the first bridge arm, the second interface is connected with the second bridge arm, the third interface is connected with the third bridge arm through a normally closed contact of the single-pole double-throw switch, and the fourth interface is connected with the third bridge arm through a normally open contact of the single-pole double-throw switch;
when single-phase alternating current is input into the alternating current input end, the moving end of the single-pole double-throw switch is kept at a normally closed contact, so that the charging circuit is charged in a single phase; when three-phase alternating current is input into the alternating current input end, the moving end of the single-pole double-throw switch is switched to the normally open contact from the normally closed contact, so that the charging circuit is switched from single-phase charging to three-phase charging.
In one possible implementation, the charging circuit includes a first bus capacitor and a second bus capacitor connected in series.
In one possible implementation manner, the three-phase charging and single-phase charging mutual switching circuit further includes a first inductor, a second inductor, and a third inductor;
the first inductor is connected between the first interface and the first bridge arm;
the second inductor is connected between the second interface and the second bridge arm;
the third inductor is connected between the stationary end of the single-pole double-throw switch and the third bridge arm.
In a possible implementation manner, the first bridge arm includes a first switching tube and a second switching tube, and the first switching tube and the second switching tube are connected in series;
the second bridge arm comprises a third switching tube and a fourth switching tube, and the third switching tube and the fourth switching tube are connected in series;
the third bridge arm comprises a fifth switching tube and a sixth switching tube, and the fifth switching tube and the sixth switching tube are connected in series;
the first switch tube and the second switch tube are connected in series, the third switch tube and the fourth switch tube are connected in series, the fifth switch tube and the sixth switch tube are connected in series, and the first bus capacitor and the second bus capacitor are connected in series.
In a possible implementation manner, the first bridge arm further includes a first diode and a second diode, the first switch tube and the first diode are connected in parallel, the second switch tube and the second diode are connected in parallel, and the first switch tube and the first diode connected in parallel are connected in series with the second switch tube and the second diode connected in parallel;
the second bridge arm further comprises a third diode and a fourth diode, the third switching tube and the third diode are connected in parallel, the fourth switching tube and the fourth diode are connected in parallel, and the third switching tube and the third diode which are connected in parallel are connected in series with the fourth switching tube and the fourth diode which are connected in parallel;
the third bridge arm further comprises a fifth diode and a sixth diode, the fifth switching tube and the fifth diode are connected in parallel, the sixth switching tube and the sixth diode are connected in parallel, and the fifth switching tube and the fifth diode which are connected in parallel are connected in series with the sixth switching tube and the sixth diode which are connected in parallel.
In a possible implementation manner, the first bridge arm includes a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, the first switching tube, the second switching tube and the first bus capacitor are connected in series, the third switching tube, the fourth switching tube and the second bus capacitor are connected in series, and the first switching tube, the second switching tube and the first bus capacitor connected in series are connected in parallel with the third switching tube, the fourth switching tube and the second bus capacitor connected in series;
the second bridge arm comprises a fifth switching tube, a sixth switching tube, a seventh switching tube and an eighth switching tube, the fifth switching tube, the sixth switching tube and the first bus capacitor are connected in series, the seventh switching tube, the eighth switching tube and the second bus capacitor are connected in series, and the fifth switching tube, the sixth switching tube and the first bus capacitor which are connected in series are connected in parallel with the seventh switching tube, the eighth switching tube and the second bus capacitor which are connected in series;
the third bridge arm comprises a ninth switching tube, a tenth switching tube, an eleventh switching tube and a twelfth switching tube, the ninth switching tube, the tenth switching tube and the first bus capacitor are connected in series, the eleventh switching tube, the twelfth switching tube and the second bus capacitor are connected in series, and the ninth switching tube, the tenth switching tube and the first bus capacitor which are connected in series are connected in parallel with the eleventh switching tube, the twelfth switching tube and the second bus capacitor which are connected in series.
In a possible implementation manner, the first bridge arm further includes a first diode and a second diode, the first diode is connected in parallel with the first switch tube and the first bus capacitor connected in series, and the second diode is connected in parallel with the fourth switch tube and the second bus capacitor connected in series;
the second bridge arm further comprises a third diode and a fourth diode, the third diode is connected with the fifth switching tube and the first bus capacitor which are connected in series in parallel, and the fourth diode is connected with the eighth switching tube and the second bus capacitor which are connected in series in parallel;
the third bridge arm further comprises a fifth diode and a sixth diode, the fifth diode is connected in parallel with the ninth switching tube and the first bus capacitor which are connected in series, and the sixth diode is connected in parallel with the twelfth switching tube and the second bus capacitor which are connected in series.
In a possible implementation manner, the first bridge arm includes a first diode, a second diode, a first switch tube and a second switch tube, the first diode and the first bus capacitor are connected in series, the second diode and the second bus capacitor are connected in series, the first switch tube and the second switch tube are connected in series, and the first diode and the first bus capacitor, the second diode and the second bus capacitor, which are connected in series, and the first switch tube and the second switch tube, which are connected in series, are connected in parallel;
the second bridge arm comprises a third diode, a fourth diode, a third switching tube and a fourth switching tube, the third diode is connected with the first bus capacitor in series, the fourth diode is connected with the second bus capacitor in series, the third switching tube is connected with the fourth switching tube in series, and the third diode and the first bus capacitor, the fourth diode and the second bus capacitor which are connected in series and the third switching tube and the fourth switching tube which are connected in series are connected in parallel;
the third bridge arm comprises a fifth diode, a sixth diode, a fifth switch tube and a sixth switch tube, the fifth diode is connected with the first bus capacitor in series, the sixth diode is connected with the second bus capacitor in series, the fifth switch tube is connected with the sixth switch tube in series, and the fifth diode is connected with the first bus capacitor, the sixth diode is connected with the second bus capacitor in series, and the fifth switch tube is connected with the sixth switch tube in parallel.
In a possible implementation manner, the first bridge arm further includes a seventh diode and an eighth diode, the first switching tube and the seventh diode are connected in parallel, the second switching tube and the eighth diode are connected in parallel, and the first switching tube and the seventh diode connected in parallel are connected in series with the eighth diode of the second switching tube connected in parallel;
the second bridge arm further comprises a ninth diode and a twelfth diode, the third switching tube and the ninth diode are connected in parallel, the fourth switching tube and the twelfth diode are connected in parallel, and the third switching tube and the ninth diode which are connected in parallel are connected in series with the fourth switching tube and the twelfth diode which are connected in parallel;
the third bridge arm further comprises an eleventh diode and a twelfth diode, the fifth switching tube and the eleventh diode are connected in parallel, the sixth switching tube and the twelfth diode are connected in parallel, and the fifth switching tube and the eleventh diode which are connected in parallel are connected in series with the sixth switching tube and the twelfth diode which are connected in parallel.
In a second aspect of the embodiments of the present application, there is provided a charging device, including the three-phase charging and single-phase charging mutual switching circuit described in any one of the first aspect of the embodiments of the present application.
By implementing the embodiment of the application, the mutual switching between three-phase charging and single-phase charging can be realized, and when the three-phase charging is carried out, the single-pole double-throw switch is controlled to act, and three bridge arms are controlled to realize three-phase rectification; when single-phase charging is carried out, the single-pole double-throw switch is controlled not to act, two bridge arms are controlled to realize single-phase rectification, and the functions of compatible three-phase voltage charging and single-phase voltage charging can be realized only by one set of circuit, so that the circuit structure complexity, the circuit cost and the circuit control difficulty are reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a three-phase charging and single-phase charging mutual switching circuit provided in an embodiment of the present application;
FIG. 2 is a schematic structural diagram of another alternate circuit for switching between three-phase charging and single-phase charging according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of another alternate circuit for three-phase charging and single-phase charging provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of another three-phase charging and single-phase charging mutual switching circuit provided in an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The embodiment of the application provides a three-phase charging and single-phase charging mutual switching circuit and a related device, and the three-phase charging and single-phase charging mutual switching can be realized. The details will be described below.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a three-phase charging and single-phase charging mutual switching circuit according to an embodiment of the present disclosure. As shown in fig. 1, the three-phase charging and single-phase charging mutual switching circuit includes an ac input terminal, a single-pole double-throw switch K1, a first bridge arm, a second bridge arm, a third bridge arm, and a charging circuit, where the ac input terminal includes a first interface U, a second interface V, a third interface W, and a fourth interface N;
the first bridge arm, the second bridge arm and the third bridge arm are connected in parallel, and the first bridge arm, the second bridge arm and the third bridge arm are respectively connected with the charging circuit; the first interface U is connected with the first bridge arm, the second interface V is connected with the second bridge arm, the third interface W is connected with the third bridge arm through a normally closed contact of the single-pole double-throw switch K1, and the fourth interface N is connected with the third bridge arm through a normally open contact of the single-pole double-throw switch K1;
when single-phase alternating current is input into the alternating current input end, the moving end of the single-pole double-throw switch K1 is kept at a normally closed contact, so that the charging circuit is charged in a single phase; when three-phase alternating current is input into the alternating current input end, the moving end of the single-pole double-throw switch K1 is switched from a normally closed contact to a normally open contact, so that the charging circuit is switched from single-phase charging to three-phase charging.
The alternating current input end judges whether the current input is three-phase voltage or single-phase voltage by collecting the input voltage. When the type of the input voltage is judged, an instruction is sent out to control the on and off of the single-pole double-throw switch K1, so that the switching between three-phase charging and single-phase charging is realized. Since it is impossible to operate simultaneously with three-phase voltage and single-phase voltage input, the neutral line (N line) of the single-phase voltage input and one of the three-phase input phases can be shared, and thus switching can be achieved by a single-pole double-throw relay K1. In fig. 1, the N lines of the single-phase input and the W lines of the three-phase input are shared only by way of example, and the N lines of the single-phase input and the U lines or V lines of the three-phase input may also be shared, which is not particularly limited in this application.
When the alternating current input end acquires that the voltage between the interfaces U/V/W is within the range of 380Vac +/-20%, the input voltage is considered to be a three-phase voltage, the moving end of the single-pole double-throw switch K1 is controlled to be converted from a normally closed contact to a normally open contact, and the three-phase voltage flows into three bridge arms to be rectified in a three-phase mode. When the voltage between the interfaces U/V/W is not within the range of 380Vac +/-20% as collected by the alternating current input end, the input voltage is considered to be single-phase voltage, the single-pole double-throw switch K1 does not act, namely the moving end of the single-pole double-throw switch K1 is kept at a normally closed contact, and the single-phase voltage enters two bridge arms (such as a first bridge arm and a third bridge arm) to carry out single-phase rectification. Thus, the three-phase charging and the single-phase charging can be switched.
Compared with a three-phase four-wire working mode, no matter single-phase charging or three-phase charging, current always passes through the zero line; because this application can cut off or connect zero line N through single-pole double-throw switch K1 to realize the switching of single-phase charging and three-phase charging, consequently this application is when the three-phase charges, and the zero line is cut off, does not have the electric current to pass through on the zero line, is to work in three-phase three-wire mode, can reduce circuit complexity and circuit cost.
It can be seen that the three-phase charging and single-phase charging mutual switching circuit provided by the embodiment of the application can realize the mutual switching between the three-phase charging and the single-phase charging, and when the three-phase charging is carried out, the single-pole double-throw switch is controlled to act, and the three bridge arms are controlled to realize the three-phase rectification; when single-phase charging is carried out, the single-pole double-throw switch is controlled not to act, two bridge arms are controlled to realize single-phase rectification, and the functions of compatible three-phase voltage charging and single-phase voltage charging can be realized only by one set of circuit, so that the circuit structure complexity, the circuit cost and the circuit control difficulty are reduced.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another switching circuit for three-phase charging and single-phase charging according to an embodiment of the present disclosure. As shown in fig. 2, the three-phase charging and single-phase charging mutual switching circuit includes an ac input terminal, a single-pole double-throw switch K1, a first bridge arm, a second bridge arm, a third bridge arm, and a charging circuit, where the ac input terminal includes a first interface U, a second interface V, a third interface W, and a fourth interface N; the first bridge arm, the second bridge arm and the third bridge arm are connected in parallel, and the first bridge arm, the second bridge arm and the third bridge arm are respectively connected with the charging circuit in parallel; the first interface U is connected with the midpoint of the first bridge arm, the second interface V is connected with the midpoint of the second bridge arm, the third interface W is connected with the midpoint of the third bridge arm through a normally closed contact of the single-pole double-throw switch K1, and the fourth interface N is connected with the midpoint of the third bridge arm through a normally open contact of the single-pole double-throw switch K1.
In one possible implementation, the charging circuit includes a first bus capacitor C1 and a second bus capacitor C2 connected in series.
It should be noted that, if the neutral line N cannot be cut off, the neutral line N is connected to the midpoint of the capacitor, regardless of single-phase operation or three-phase operation, and therefore, the charging circuit must have the midpoint of the capacitor, that is, the capacitors must be connected in series. In fig. 2, the neutral line N can be disconnected by the single-pole double-throw switch K1, and the first bus capacitor C1 and the second bus capacitor C2 are connected in series to improve the voltage level.
The bus capacitor is a capacitor disposed on the bus, and may specifically be one capacitor, or may also be at least two capacitors, and fig. 2 illustrates the bus capacitor as two capacitors, i.e., a first bus capacitor C1 and a second bus capacitor C2.
In one possible implementation, the three-phase charging and single-phase charging mutual switching circuit further includes a first inductor L1, a second inductor L2, and a third inductor L3; the first inductor L1 is connected between the first interface U and the first leg; the second inductor L2 is connected between the second interface V and the second leg; the third inductor L3 is connected between the stationary terminal of the single-pole double-throw switch K1 and the third bridge arm.
In this embodiment, the number of inductors is not limited, and two or more inductors may be provided at each interface, and the specific number of inductors may be determined by combining actual product conditions, and fig. 2 illustrates an example in which one inductor is connected at each interface.
In one possible implementation, the first leg includes a first switching tube Q1 and a second switching tube Q2, and the first switching tube Q1 and the second switching tube Q2 are connected in series; the second bridge arm comprises a third switching tube Q3 and a fourth switching tube Q4, and the third switching tube Q3 and the fourth switching tube Q4 are connected in series; the third bridge arm comprises a fifth switch tube Q5 and a sixth switch tube Q6, and the fifth switch tube Q5 and the sixth switch tube Q6 are connected in series; the first switch tube Q1 and the second switch tube Q2 which are connected in series, the third switch tube Q3 and the fourth switch tube Q4 which are connected in series, the fifth switch tube Q5 and the sixth switch tube Q6 which are connected in series, and the first bus capacitor C1 and the second bus capacitor C2 which are connected in series are connected in parallel.
The switch tube described herein may be embodied as a triode, a silicon carbide (SiC) transistor, an Insulated Gate Bipolar Transistor (IGBT), a metal-oxygen-semiconductor field effect transistor (MOS), or the like, and it should be understood that although the first switch tube Q1 to the sixth switch tube Q6 and the like shown in this application are all one switch tube, two or more switch tubes may be used, which is not specifically limited in this application.
In a possible implementation manner, the first bridge arm further includes a first diode D1 and a second diode D2, the first switch tube Q1 and the first diode D1 are connected in parallel, the second switch tube Q2 and the second diode D2 are connected in parallel, and the first switch tube Q1 and the first diode D1 connected in parallel are connected in series between the second switch tube Q2 and the second diode D2 connected in parallel; the second bridge arm further comprises a third diode D3 and a fourth diode D4, the third switch tube Q3 and the third diode D3 are connected in parallel, the fourth switch tube Q4 and the fourth diode D4 are connected in parallel, and the third switch tube Q3 and the third diode D3 which are connected in parallel are connected in series between the fourth switch tube Q4 and the fourth diode D4 which are connected in parallel; the third bridge arm further comprises a fifth diode D5 and a sixth diode D6, the fifth switching tube Q5 and the fifth diode D5 are connected in parallel, the sixth switching tube Q6 and the sixth diode D6 are connected in parallel, and the fifth switching tube Q5 and the fifth diode D5 which are connected in parallel are connected in series with the sixth switching tube Q6 and the sixth diode D6 which are connected in parallel.
Here, the first diode D1 to the sixth diode D6 and the like shown in the present application are each one diode only by way of example, and the number of diodes is not limited in the embodiments of the present application.
When the voltage between the U/V/W interfaces is collected by the alternating current input end and is within the range of 380Vac +/-20%, the input voltage is considered to be three-phase voltage, the moving end of the single-pole double-throw switch K1 is controlled to be switched from a normally closed contact to a normally open contact, the three-phase voltage respectively flows through the inductors L1-L3 to enter the three-bridge arm formed by the switch tubes Q1-Q6, and three-phase rectification can be achieved through the control of the switch tubes Q1-Q6 through periodic switching. When the voltage collected by the alternating current input end between the interfaces U/V/W is not within the range of 380Vac +/-20%, the input is considered to be single-phase voltage, the single-pole double-throw switch K1 does not act, namely the moving end of the single-pole double-throw switch K1 is kept at a normally closed contact, the single-phase voltage flows through the inductor (such as L1 and L3) and enters the two bridge arms formed by the switching tubes (such as Q1-Q2 and Q5-Q6), and single-phase rectification can be realized by controlling the periodic switches of the switching tubes on the two bridge arms. Thus, the three-phase charging and the single-phase charging can be switched. Compared with the prior art, the method has the advantages of simple control method, and is beneficial to reducing the cost and the control difficulty.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another three-phase charging and single-phase charging switching circuit according to an embodiment of the present disclosure. The structural schematic diagram of the three-phase charging and single-phase charging mutual switching circuit shown in fig. 3 is a modified structural schematic diagram of the three-phase charging and single-phase charging mutual switching circuit shown in fig. 2, and compared with the three-phase charging and single-phase charging mutual switching circuit shown in fig. 2, the first bridge arm, the second bridge arm and the third bridge arm of the three-phase charging and single-phase charging mutual switching circuit shown in fig. 3 include different components and different connection modes. The three-phase charging and single-phase charging mutual switching circuit shown in fig. 3 is applied to three-phase/single-phase charging switching of a three-phase I-shaped circuit.
In a possible implementation manner, the first bridge arm includes a first switching tube Q1, a second switching tube Q2, a third switching tube Q3 and a fourth switching tube Q4, the first switching tube Q1, the second switching tube Q2 and the first bus capacitor C1 are connected in series, the third switching tube Q3, the fourth switching tube Q4 and the second bus capacitor C2 are connected in series, and the first switching tube Q1, the second switching tube Q2 and the first bus capacitor C1 connected in series are connected in parallel with the third switching tube Q3, the fourth switching tube Q4 and the second bus capacitor C2 connected in series;
the second bridge arm comprises a fifth switching tube Q5, a sixth switching tube Q6, a seventh switching tube Q7 and an eighth switching tube Q8, the fifth switching tube Q5, the sixth switching tube Q6 and the first bus capacitor C1 are connected in series, the seventh switching tube Q7, the eighth switching tube Q8 and the second bus capacitor C2 are connected in series, and the fifth switching tube Q5, the sixth switching tube Q6 and the first bus capacitor C1 which are connected in series are connected in parallel with the seventh switching tube Q7, the eighth switching tube Q8 and the second bus capacitor C2 which are connected in series;
the third bridge arm includes a ninth switching tube Q9, a tenth switching tube Q10, an eleventh switching tube Q11 and a twelfth switching tube Q12, the ninth switching tube Q9, the tenth switching tube Q10 and the first bus capacitor C1 are connected in series, the eleventh switching tube Q11, the twelfth switching tube Q12 and the second bus capacitor C2 are connected in series, and the ninth switching tube Q9, the tenth switching tube Q10 and the first bus capacitor C1 connected in series are connected in parallel with the eleventh switching tube Q11, the twelfth switching tube Q12 and the second bus capacitor C2 connected in series.
As illustrated in the first arm, when charging, the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, and the fourth switching tube Q4 may be turned on at the same time, and since the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, and the fourth switching tube Q4 may be controlled to be turned on and off by an external control circuit, the polarity relationship among the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, and the fourth switching tube Q4 is not limited in this embodiment of the application.
Correspondingly, in the second leg, the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7 and the eighth switching tube Q8 may refer to the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4; in the third leg, the ninth switching tube Q9, the tenth switching tube Q10, the eleventh switching tube Q11 and the twelfth switching tube Q12 may refer to the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4.
It should be understood that the first to twelfth switching tubes Q1 to Q12 shown in the present application are all one switching tube only for illustration, and the number of switching tubes is not limited in the embodiments of the present application.
In a possible implementation, the first leg further includes a first diode D1 and a second diode D2, the first diode D1 is connected in parallel with the first switch tube Q1 and the first bus capacitor C1 connected in series, and the second diode D2 is connected in parallel with the fourth switch tube Q4 and the second bus capacitor C2 connected in series;
the second bridge arm further comprises a third diode D3 and a fourth diode D4, the third diode D3 is connected in parallel with the series connection of the fifth switching tube Q5 and the first bus capacitor C1, and the fourth diode D4 is connected in parallel with the series connection of the eighth switching tube Q8 and the second bus capacitor C2;
the third leg further includes a fifth diode D5 and a sixth diode D6, the fifth diode D5 is connected in parallel with the ninth switching tube Q9 and the first bus capacitor C1 connected in series, and the sixth diode D6 is connected in parallel with the twelfth switching tube Q12 and the second bus capacitor C2 connected in series.
Wherein the polarity of the first diode D1 and the second diode D2 are the same; the polarity of the third diode D3 and the fourth diode D4 is the same; the polarity of the fifth diode D5 and the sixth diode D6 is the same.
It should be understood that the first to sixth diodes D1 to D6 shown in the present application are each one diode only by way of example, and the number of diodes is not limited in the embodiments of the present application.
Referring to fig. 4, fig. 4 is a schematic structural diagram of another three-phase charging and single-phase charging mutual switching circuit according to an embodiment of the present disclosure. The structural schematic diagram of the three-phase charging and single-phase charging mutual switching circuit shown in fig. 4 is a modified structural schematic diagram of the three-phase charging and single-phase charging mutual switching circuit shown in fig. 2, and compared with the three-phase charging and single-phase charging mutual switching circuit shown in fig. 2, the first bridge arm, the second bridge arm and the third bridge arm of the three-phase charging and single-phase charging mutual switching circuit shown in fig. 4 include different components and different connection modes. Among them, the three-phase charging and single-phase charging mutual switching circuit shown in fig. 4 is applied to three-phase/single-phase charging switching of a three-phase T-shaped circuit.
In a possible implementation manner, the first bridge arm includes a first diode D1, a second diode D2, a first switch tube Q1 and a second switch tube Q2, the first diode D1 and the first bus capacitor C1 are connected in series, the second diode D2 and the second bus capacitor C2 are connected in series, the first switch tube Q1 and the second switch tube Q2 are connected in series, and the first diode D1 and the first bus capacitor C1 connected in series, the second diode D2 and the second bus capacitor C2 connected in series, and the first switch tube Q1 and the second switch tube Q2 connected in series are connected in parallel;
the second bridge arm comprises a third diode D3, a fourth diode D4, a third switch tube Q3 and a fourth switch tube Q4, the third diode D3 and the first bus capacitor C1 are connected in series, the fourth diode D4 and the second bus capacitor C2 are connected in series, the third switch tube Q3 and the fourth switch tube Q4 are connected in series, and the third diode D3 and the first bus capacitor C1 which are connected in series, the fourth diode D4 and the second bus capacitor C2 which are connected in series and the third switch tube Q3 and the fourth switch tube Q4 which are connected in series are connected in parallel;
the third bridge arm includes a fifth diode D5, a sixth diode D6, a fifth switch Q5 and a sixth switch Q6, the fifth diode D5 and the first bus capacitor C1 are connected in series, the sixth diode D6 and the second bus capacitor C2 are connected in series, the fifth switch Q5 and the sixth switch Q6 are connected in series, and the fifth diode D5 and the first bus capacitor C1 connected in series, the sixth diode D6 and the second bus capacitor C2 connected in series, and the fifth switch Q5 and the sixth switch Q6 connected in series are connected in parallel.
For example, in the first arm, the polarities of the first diode D1 and the second diode D2 are opposite, and when the first diode D1 is turned on, the second diode D2 is blocked; when the first diode D1 is blocked, the second diode D2 is turned on, for example, the first diode D1 may be a PNP-type diode, the second diode D2 may be an NPN-type diode, or the first diode D1 may be an NPN-type diode, the second diode D2 may be a PNP-type diode. When charging, the first switch tube Q1 and the second switch tube Q2 can be turned on simultaneously, and since the turning on and off of the first switch tube Q1 and the second switch tube Q2 can be controlled by an external control circuit, the polarity relationship between the first switch tube Q1 and the second switch tube Q2 is not limited in the embodiment of the present application.
Correspondingly, on the second leg, the concrete expressions of the third diode D3, the fourth diode D4, the third switch tube Q3 and the fourth switch tube Q4 can refer to the descriptions at the first diode D1, the second diode D2, the first switch tube Q1 and the second switch tube Q2; in the third leg, the concrete expressions of the fifth diode D5, the sixth diode D6, the fifth switch tube Q5 and the sixth switch tube Q6 may also refer to the descriptions of the first diode D1, the second diode D2, the first switch tube Q1 and the second switch tube Q2, and are not exemplified here.
In a possible implementation manner, the first bridge arm further includes a seventh diode D7 and an eighth diode D8, the first switch Q1 and the seventh diode D7 are connected in parallel, the second switch Q2 and the eighth diode D8 are connected in parallel, and the first switch Q1 and the seventh diode D7 connected in parallel are connected in series with the second switch Q2 and the eighth diode D8 connected in parallel;
the second bridge arm further comprises a ninth diode D9 and a ninth diode D10, the third switch tube Q3 and the ninth diode D9 are connected in parallel, the fourth switch tube Q4 and the twelfth diode D10 are connected in parallel, and the third switch tube Q3 and the ninth diode D9 which are connected in parallel are connected in series between the fourth switch tube Q4 and the twelfth diode D10 which are connected in parallel;
the third bridge arm further includes an eleventh diode D11 and a twelfth diode D12, the fifth switching tube Q5 and the eleventh diode D11 are connected in parallel, the sixth switching tube Q6 and the twelfth diode D12 are connected in parallel, and the fifth switching tube Q5 and the eleventh diode D11 connected in parallel are connected in series with the sixth switching tube Q6 and the twelfth diode D12 connected in parallel.
Wherein the seventh diode D7 and the eighth diode D8 are of opposite polarity; the ninth diode D9 and the twelfth diode D10 are of opposite polarity; the polarity of the eleventh diode D11 and the polarity of the twelfth diode D12 are opposite, and the seventh diode D7 and the eighth diode D8, the ninth diode D9 and the twelfth diode D10, and the eleventh diode D11 and the twelfth diode D12 can be expressed by referring to the first diode D1 and the second diode D2, which are not illustrated herein.
It should be understood that the first to twelfth switching tubes Q1 to Q12 shown in the present application are all one switching tube only for illustration, and the number of switching tubes is not limited in the embodiments of the present application; and the first to twelfth diodes D1 to D12 shown in the present application are each one diode only by way of example, and the number of diodes is not limited in the embodiments of the present application.
The embodiment of the application provides a charging device, which comprises a three-phase charging and single-phase charging mutual switching circuit shown in any one of corresponding embodiments of fig. 1-4 of the application.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The three-phase charging and single-phase charging mutual switching circuit and the related device provided by the embodiment of the present application are described in detail above, and a specific example is applied in the present application to explain the principle and the implementation manner of the present application, and the description of the above embodiment is only used to help understanding the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A three-phase charging and single-phase charging mutual switching circuit is characterized by comprising an alternating current input end, a single-pole double-throw switch, a first bridge arm, a second bridge arm, a third bridge arm and a charging circuit, wherein the alternating current input end comprises a first interface, a second interface, a third interface and a fourth interface;
the first bridge arm, the second bridge arm and the third bridge arm are connected in parallel, and the first bridge arm, the second bridge arm and the third bridge arm are respectively connected with the charging circuit; the first interface is connected with the first bridge arm, the second interface is connected with the second bridge arm, the third interface is connected with the third bridge arm through a normally closed contact of the single-pole double-throw switch, and the fourth interface is connected with the third bridge arm through a normally open contact of the single-pole double-throw switch;
when single-phase alternating current is input into the alternating current input end, the moving end of the single-pole double-throw switch is kept at a normally closed contact, so that the charging circuit is charged in a single phase; when three-phase alternating current is input into the alternating current input end, the moving end of the single-pole double-throw switch is switched to the normally open contact from the normally closed contact, so that the charging circuit is switched from single-phase charging to three-phase charging.
2. The three-phase charging and single-phase charging switcher circuit of claim 1, wherein the charging circuit comprises a first bus capacitor and a second bus capacitor connected in series.
3. The circuit of claim 2, further comprising a first inductor, a second inductor, and a third inductor;
the first inductor is connected between the first interface and the first bridge arm;
the second inductor is connected between the second interface and the second bridge arm;
the third inductor is connected between the stationary end of the single-pole double-throw switch and the third bridge arm.
4. The three-phase charging and single-phase charging mutual switching circuit according to claim 3, characterized in that:
the first bridge arm comprises a first switching tube and a second switching tube, and the first switching tube and the second switching tube are connected in series;
the second bridge arm comprises a third switching tube and a fourth switching tube, and the third switching tube and the fourth switching tube are connected in series;
the third bridge arm comprises a fifth switching tube and a sixth switching tube, and the fifth switching tube and the sixth switching tube are connected in series;
the first switch tube and the second switch tube are connected in series, the third switch tube and the fourth switch tube are connected in series, the fifth switch tube and the sixth switch tube are connected in series, and the first bus capacitor and the second bus capacitor are connected in series.
5. The three-phase charging and single-phase charging mutual switching circuit according to claim 4, characterized in that:
the first bridge arm further comprises a first diode and a second diode, the first switch tube and the first diode are connected in parallel, the second switch tube and the second diode are connected in parallel, and the first switch tube and the first diode which are connected in parallel are connected in series with the second switch tube and the second diode which are connected in parallel;
the second bridge arm further comprises a third diode and a fourth diode, the third switching tube and the third diode are connected in parallel, the fourth switching tube and the fourth diode are connected in parallel, and the third switching tube and the third diode which are connected in parallel are connected in series with the fourth switching tube and the fourth diode which are connected in parallel;
the third bridge arm further comprises a fifth diode and a sixth diode, the fifth switching tube and the fifth diode are connected in parallel, the sixth switching tube and the sixth diode are connected in parallel, and the fifth switching tube and the fifth diode which are connected in parallel are connected in series with the sixth switching tube and the sixth diode which are connected in parallel.
6. The three-phase charging and single-phase charging mutual switching circuit according to claim 3, characterized in that:
the first bridge arm comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, the first switch tube, the second switch tube and the first bus capacitor are connected in series, the third switch tube, the fourth switch tube and the second bus capacitor are connected in series, and the first switch tube, the second switch tube and the first bus capacitor which are connected in series are connected in parallel with the third switch tube, the fourth switch tube and the second bus capacitor which are connected in series;
the second bridge arm comprises a fifth switching tube, a sixth switching tube, a seventh switching tube and an eighth switching tube, the fifth switching tube, the sixth switching tube and the first bus capacitor are connected in series, the seventh switching tube, the eighth switching tube and the second bus capacitor are connected in series, and the fifth switching tube, the sixth switching tube and the first bus capacitor which are connected in series are connected in parallel with the seventh switching tube, the eighth switching tube and the second bus capacitor which are connected in series;
the third bridge arm comprises a ninth switching tube, a tenth switching tube, an eleventh switching tube and a twelfth switching tube, the ninth switching tube, the tenth switching tube and the first bus capacitor are connected in series, the eleventh switching tube, the twelfth switching tube and the second bus capacitor are connected in series, and the ninth switching tube, the tenth switching tube and the first bus capacitor which are connected in series are connected in parallel with the eleventh switching tube, the twelfth switching tube and the second bus capacitor which are connected in series.
7. The three-phase charging and single-phase charging mutual switching circuit according to claim 6, characterized in that:
the first bridge arm further comprises a first diode and a second diode, the first diode is connected with the first switch tube and the first bus capacitor which are connected in series in parallel, and the second diode is connected with the fourth switch tube and the second bus capacitor which are connected in series in parallel;
the second bridge arm further comprises a third diode and a fourth diode, the third diode is connected with the fifth switching tube and the first bus capacitor which are connected in series in parallel, and the fourth diode is connected with the eighth switching tube and the second bus capacitor which are connected in series in parallel;
the third bridge arm further comprises a fifth diode and a sixth diode, the fifth diode is connected in parallel with the ninth switching tube and the first bus capacitor which are connected in series, and the sixth diode is connected in parallel with the twelfth switching tube and the second bus capacitor which are connected in series.
8. The three-phase charging and single-phase charging mutual switching circuit according to claim 3, characterized in that:
the first bridge arm comprises a first diode, a second diode, a first switch tube and a second switch tube, the first diode is connected with the first bus capacitor in series, the second diode is connected with the second bus capacitor in series, the first switch tube is connected with the second switch tube in series, and the first diode and the first bus capacitor which are connected in series, the second diode and the second bus capacitor which are connected in series and the first switch tube and the second switch tube which are connected in series are connected in parallel;
the second bridge arm comprises a third diode, a fourth diode, a third switching tube and a fourth switching tube, the third diode is connected with the first bus capacitor in series, the fourth diode is connected with the second bus capacitor in series, the third switching tube is connected with the fourth switching tube in series, and the third diode and the first bus capacitor, the fourth diode and the second bus capacitor which are connected in series and the third switching tube and the fourth switching tube which are connected in series are connected in parallel;
the third bridge arm comprises a fifth diode, a sixth diode, a fifth switch tube and a sixth switch tube, the fifth diode is connected with the first bus capacitor in series, the sixth diode is connected with the second bus capacitor in series, the fifth switch tube is connected with the sixth switch tube in series, and the fifth diode is connected with the first bus capacitor, the sixth diode is connected with the second bus capacitor in series, and the fifth switch tube is connected with the sixth switch tube in parallel.
9. The three-phase charging and single-phase charging mutual switching circuit according to claim 8, characterized in that:
the first bridge arm further comprises a seventh diode and an eighth diode, the first switch tube and the seventh diode are connected in parallel, the second switch tube and the eighth diode are connected in parallel, and the first switch tube and the seventh diode which are connected in parallel are connected in series with the eighth diode of the second switch tube which is connected in parallel;
the second bridge arm further comprises a ninth diode and a twelfth diode, the third switching tube and the ninth diode are connected in parallel, the fourth switching tube and the twelfth diode are connected in parallel, and the third switching tube and the ninth diode which are connected in parallel are connected in series with the fourth switching tube and the twelfth diode which are connected in parallel;
the third bridge arm further comprises an eleventh diode and a twelfth diode, the fifth switching tube and the eleventh diode are connected in parallel, the sixth switching tube and the twelfth diode are connected in parallel, and the fifth switching tube and the eleventh diode which are connected in parallel are connected in series with the sixth switching tube and the twelfth diode which are connected in parallel.
10. A charging device comprising the three-phase charging and single-phase charging mutual switching circuit according to any one of claims 1 to 9.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2020/101790 WO2022011532A1 (en) | 2020-07-14 | 2020-07-14 | Three-phase charging and single-phase charging mutual switching circuit and related device |
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| CN112996688A true CN112996688A (en) | 2021-06-18 |
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| CN202080005898.5A Pending CN112996688A (en) | 2020-07-14 | 2020-07-14 | Three-phase charging and single-phase charging mutual switching circuit and related device |
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| WO (1) | WO2022011532A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023157562A1 (en) * | 2022-02-18 | 2023-08-24 | 矢崎総業株式会社 | Power conversion device and on-board charger |
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