CN111251911A - Electric automobile, charger thereof and charger control method - Google Patents
Electric automobile, charger thereof and charger control method Download PDFInfo
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- CN111251911A CN111251911A CN201811459282.6A CN201811459282A CN111251911A CN 111251911 A CN111251911 A CN 111251911A CN 201811459282 A CN201811459282 A CN 201811459282A CN 111251911 A CN111251911 A CN 111251911A
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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 discloses an electric automobile, a charger thereof and a charger control method, wherein the charger comprises: a pre-charging switch; the pre-charging resistor and the first pre-charging capacitor are connected with the pre-charging switch; an AC switch; the alternating current module is connected with the alternating current switch, the pre-charging resistor and the first pre-charging capacitor; the second pre-charging capacitor is connected with the alternating current module in parallel; the high-voltage direct current module is connected with the second pre-charging capacitor in parallel and is connected with the high-voltage battery pack; the controller is used for controlling the high-voltage direct-current module to pre-charge the second pre-charge capacitor, closing the pre-charge switch to charge the first pre-charge capacitor through the power grid after the voltage of the second pre-charge capacitor is larger than a first preset threshold and smaller than a second preset threshold, and closing the alternating-current switch after the pre-charge of the first pre-charge capacitor is completed. Therefore, the time of pre-charging can be greatly reduced, so that the generation of large current when the relay is attracted is effectively avoided, the relay is prevented from being sintered, and the reliability of the system is improved.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a charger of an electric automobile, the electric automobile and a charger control method of the electric automobile.
Background
With the progress of commercialization of electric vehicles, DC converters and OBC on-board chargers in electric vehicles are also becoming important parts in electric vehicles. In a charging system of an electric automobile, a DC converter and an OBC vehicle-mounted charger can be integrated in a topological structure, and pre-charging a first pre-charging capacitor and a second pre-charging capacitor in the charging system is an essential link in system design.
In the related art, the first pre-charge capacitor and the second pre-charge capacitor are pre-charged through the pre-charge resistor by using the power grid. However, when the pre-charging is performed in the above manner, the required pre-charging time is long, which causes serious heat generation of the pre-charging resistor, and the resistor is increased, so that the voltage division of the pre-charging resistor is large, and therefore, a large current is easily generated when a relay connected in parallel with the pre-charging resistor in a system is pulled in, and further, the relay is sintered, which greatly affects the reliability of the system.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first object of the present invention is to provide a charger for an electric vehicle, which can greatly reduce the time for pre-charging, thereby effectively avoiding the generation of a large current when a relay is closed, preventing the relay from being sintered, and improving the reliability of the system.
The second purpose of the invention is to provide an electric automobile.
The third purpose of the invention is to provide a charger control method of an electric automobile.
A fourth object of the invention is to propose a non-transitory computer-readable storage medium.
A fifth object of the invention is to propose an electronic device.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a charger for an electric vehicle, including: a pre-charging switch; the pre-charging resistor and the first pre-charging capacitor are connected with the pre-charging switch; an AC switch; the alternating current module is connected with the alternating current switch, the pre-charging resistor and the first pre-charging capacitor; the second pre-charging capacitor is connected with the alternating current module in parallel; the high-voltage direct current module is connected with the second pre-charging capacitor in parallel and is connected with a high-voltage battery pack; the controller is used for controlling the high-voltage direct-current module to pre-charge the second pre-charge capacitor, closing the pre-charge switch to charge the first pre-charge capacitor through a power grid after the voltage of the second pre-charge capacitor is greater than a first preset threshold and smaller than a second preset threshold, and closing the alternating-current switch after the pre-charge of the first pre-charge capacitor is completed.
According to the charger of the electric automobile, the high-voltage direct-current module is controlled by the controller to pre-charge the second pre-charging capacitor, after the voltage of the second pre-charging capacitor is larger than a first preset threshold and smaller than a second preset threshold, the pre-charging switch is closed to charge the first pre-charging capacitor through the power grid, and after the pre-charging of the first pre-charging capacitor is completed, the alternating-current switch is closed. Therefore, the time of pre-charging can be greatly reduced, so that the generation of large current when the relay is attracted is effectively avoided, the relay is prevented from being sintered, and the reliability of the system is improved.
In order to achieve the above object, a second aspect of the present invention provides an electric vehicle, including the charger of the electric vehicle according to the first aspect of the present invention.
According to the electric automobile provided by the embodiment of the invention, the pre-charging time can be greatly reduced, so that the generation of larger current when the relay is attracted is effectively avoided, the relay is prevented from being sintered, and the reliability of the system is improved.
In order to achieve the above object, a charger control method for an electric vehicle according to a third aspect of the present invention includes: the control method of the charger of the electric automobile comprises the following steps that a pre-charging switch, a pre-charging resistor, a first pre-charging capacitor, an alternating current switch, an alternating current module, a second pre-charging capacitor and a high-voltage direct current module are arranged, the pre-charging resistor is respectively connected with the first pre-charging capacitor and the pre-charging switch, the alternating current module is connected with the alternating current switch, the pre-charging resistor and the first pre-charging capacitor, the second pre-charging capacitor is connected with the alternating current module in parallel, the high-voltage direct current module is connected with the second pre-charging capacitor in parallel and is connected with a: controlling the high-voltage direct current module to pre-charge the second pre-charge capacitor; after the voltage of the second pre-charging capacitor is greater than a first preset threshold and smaller than a second preset threshold, closing the pre-charging switch to charge the first pre-charging capacitor through the power grid; after the first pre-charging capacitor completes pre-charging, the alternating current switch is closed.
According to the charger control method of the electric automobile, the high-voltage direct-current module is controlled by the controller to pre-charge the second pre-charging capacitor, after the voltage of the second pre-charging capacitor is larger than a first preset threshold and smaller than a second preset threshold, the pre-charging switch is closed to charge the first pre-charging capacitor through the power grid, and after the pre-charging of the first pre-charging capacitor is completed, the alternating-current switch is closed. Therefore, the time of pre-charging can be greatly reduced, so that the generation of large current when the relay is attracted is effectively avoided, the relay is prevented from being sintered, and the reliability of the system is improved.
To achieve the above object, a fourth aspect of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the charger control method for an electric vehicle according to the third aspect of the present invention.
According to the non-transitory computer readable storage medium provided by the embodiment of the invention, the pre-charging time can be greatly reduced, so that the generation of a larger current when the relay is attracted is effectively avoided, the relay is prevented from being sintered, and the reliability of the system is improved.
To achieve the above object, a fifth embodiment of the present invention provides an electronic device, including: the charger control method for the electric automobile comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein when the processor executes the program, the charger control method for the electric automobile provided by the embodiment of the third aspect of the invention is realized.
According to the electronic equipment provided by the embodiment of the invention, the pre-charging time can be greatly reduced, so that the generation of larger current when the relay is attracted is effectively avoided, the relay is prevented from being sintered, and the reliability of the system is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a charger of an electric vehicle according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a charger of an electric vehicle according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a charger of an electric vehicle according to an embodiment of the present invention;
fig. 4 is a flowchart of a charger control method of an electric vehicle according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A charger for an electric vehicle, a charger control method for an electric vehicle, a non-transitory computer-readable storage medium, and an electronic apparatus according to embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a charger of an electric vehicle according to an embodiment of the present invention. As shown in fig. 1, the charger according to the embodiment of the invention may include a pre-charge switch S1, a pre-charge resistor R1, a first pre-charge capacitor C1, an ac switch S2, an ac module 100, a second pre-charge capacitor C2, a high-voltage dc module 200, and a controller 300.
The pre-charging resistor R1 and the first pre-charging capacitor C1 are connected with the pre-charging switch S1; the alternating current module 100 is connected with an alternating current switch S2, a pre-charging resistor R1 and a first pre-charging capacitor C1; the second pre-charging capacitor C2 is connected in parallel with the ac module 100; the high-voltage direct current module 200 is connected with a second pre-charging capacitor C2 in parallel and is connected with a high-voltage battery pack; the controller 300 is configured to control the high voltage dc module 200 to precharge the second precharge capacitor C2, and after the voltage of the second precharge capacitor C2 is greater than the first preset threshold and less than the second preset threshold, close the precharge switch S1 to charge the first precharge capacitor C1 through the power grid, and after the precharge of the first precharge capacitor C1 is completed, close the ac switch S2. The pre-charge switch S1 may be a pre-charge relay, and the ac switch S2 may be an ac relay (main relay of the electric vehicle).
According to an embodiment of the present invention, the first preset threshold may be a peak voltage of the power grid, and the second preset threshold may be a minimum value of the withstand voltage of the switching tube and the second precharge capacitor C2. The switch tubes may be the switch tubes in the ac module 100 and the high voltage dc module 200.
Specifically, as shown in fig. 2, the ac module 100 may include inductors L1-L2, switch transistors Q1-Q6, and anti-parallel diodes and parallel capacitors on each switch transistor, when the voltage across the first precharge capacitor C1 is greater than the voltage across the second precharge capacitor C2, the anti-parallel diodes on the switch transistors Q1-Q6 may generate uncontrolled rectification, so that when the precharge switch S1 or the ac switch S2 is closed, the second precharge capacitor C2 forms a loop with the grid, and therefore, the first precharge capacitor C1 and the second precharge capacitor C2 may be regarded as being connected in parallel across the grid, that is, the first precharge capacitor C1 and the second precharge capacitor C2 may be precharged through the precharge resistor R1 by using the grid.
When the first pre-charge capacitor C1 and the second pre-charge capacitor C2 are pre-charged by the grid, if the pre-charge switch S1 (pre-charge relay) or the ac switch S2 (main relay of the electric vehicle) is directly closed, a voltage difference between two ends of the relay may generate a large current, which may easily cause adverse effects such as seizure of the relay, and therefore, the pre-charge resistor R1 may be connected to the pre-charge switch S1, so that the grid may pre-charge the first pre-charge capacitor C1 and the second pre-charge capacitor C2 through the pre-charge resistor R1.
In practical applications, the first pre-charge capacitor C1 may be a filter capacitor, the second pre-charge capacitor C2 may be an energy storage capacitor, and the capacity of the second pre-charge capacitor C2 is much larger than that of the first pre-charge capacitor C1, if the first pre-charge capacitor C1 and the second pre-charge capacitor C2 are pre-charged in the above manner, the required pre-charge time is long, which easily causes the pre-charge resistor R1 to generate heat seriously, so that the resistance value of the pre-charge resistor R1 is increased, and the voltage division of the pre-charge resistor R1 is large, therefore, when the ac switch S2 is closed, the voltage at two ends of the ac switch S2 is large, so as to generate a large current, which easily causes the ac switch S2 to be sintered, and greatly reduce the reliability of the system.
Therefore, in the embodiment of the present invention, the second pre-charge capacitor may be pre-charged through the high voltage dc module 200, so that the voltage across the second pre-charge capacitor C2 gradually increases until the voltage of the second pre-charge capacitor C2 is greater than the first preset threshold and less than the second preset threshold, that is, the voltage of the second pre-charge capacitor C2 is between the peak voltage (e.g., 310V) of the power grid and the minimum value of the withstand voltages of the switch tube and the second pre-charge capacitor C2 (e.g., the voltage of the second pre-charge capacitor C2 is 380V). At this time, the voltage of the second pre-charging capacitor C2 is higher than the voltage of the power grid, so that the cathode voltage of the anti-parallel diode on the switching tubes Q1-Q6 is higher than the anode voltage, and thus the diode cannot be turned on, and further uncontrolled rectification cannot be generated, so that the second pre-charging capacitor C2 is isolated from the first pre-charging capacitor C1. At this time, the controller 300 is only required to control the precharge switch S1 to be closed, so as to charge the first precharge capacitor C1 through the power grid, and after the first precharge capacitor C1 is charged (i.e., after the voltage of the first precharge capacitor C1 approaches the voltage of the power grid), the ac switch S1 is closed, and the first preset switch S1 is opened.
From this, carry out the precharge to second precharge capacitor C2 earlier through high voltage direct current module 200, again carry out the precharge to first precharge capacitor C1 through the electric wire netting, greatly reduced the time of precharge to produce great electric current when avoiding the actuation relay effectively, prevent that the relay from taking place the sintering, improved the reliability of system, simultaneously, the precharge resistance only needs to select according to the actual conditions that carries out the precharge to first precharge capacitor, the cost is reduced.
In addition, in practical application, even if the pre-charging resistor is damaged, the second pre-charging capacitor can still be pre-charged, the current generated when the relay is attracted is small, and therefore the relay can be prevented from being sintered.
According to an embodiment of the invention, as shown in fig. 3, the high voltage dc module 200 may include: a first control submodule 210, a transformer T1 and a second control submodule 220.
The first control submodule 210 is connected in parallel with the second precharge capacitor C2, and the first control submodule 210 may include a first switching tube Q7 to a fourth switching tube Q10; the first stage of the transformer T1 is connected to the first control submodule 210; the second control submodule 220 is connected to the high voltage battery pack and to the second stage of the transformer T1, and the second control submodule 220 may include fifth through eighth switching transistors Q11 through Q14.
Specifically, as shown in fig. 3, the first control sub-module 210 may include a set of single phase legs, which may include two pairs of legs, and each pair of legs may include an upper leg and a lower leg. The upper bridge arm of the first pair of bridge arms can comprise a first switching tube Q7, a diode and a capacitor which are connected with the first switching tube Q7 in parallel, and the lower bridge arm can comprise a second switching tube Q8, a diode and a capacitor which are connected with the second switching tube Q8 in parallel; the upper leg of the other pair of legs may include a third switching transistor Q9 and a diode and capacitor connected in parallel with third switching transistor Q9, and the lower leg may include a fourth switching transistor Q10 and a diode and capacitor connected in parallel with fourth switching transistor Q10. A first end of the first switch tube Q7 is connected to one end of the second precharge capacitor C2, a second end of the second switch tube Q8 is connected to the other end of the second precharge capacitor C2, a node of the first switch tube Q7 and the second switch tube Q8 is connected to one end of the first stage of the transformer T1 through an inductor, and a node of the third switch tube Q9 and the fourth switch tube Q10 is connected to the other end of the first stage of the transformer T1 through a capacitor.
Similarly, the second control sub-module 220 may include another set of single phase legs, which may also include two pairs of legs, and each pair may include an upper leg and a lower leg. The upper bridge arm of the first pair of bridge arms can comprise a fifth switch tube Q11, a diode and a capacitor which are connected with the fifth switch tube Q11 in parallel, and the lower bridge arm can comprise a sixth switch tube Q12, a diode and a capacitor which are connected with the sixth switch tube Q12 in parallel; the upper leg of the other pair of legs may include a seventh switch Q13 and a diode and capacitor connected in parallel with the seventh switch Q13, and the lower leg may include an eighth switch Q14 and a diode and capacitor connected in parallel with the eighth switch Q14. A first end of the seventh switching tube Q13 is connected to the positive electrode of the high-voltage battery pack, a second end of the eighth switching tube Q14 is connected to the negative electrode of the high-voltage battery pack, a node of the fifth switching tube Q11 and the sixth switching tube Q12 is connected to one end of the second stage of the transformer T1 through an inductor, and a node of the seventh switching tube Q13 and the eighth switching tube Q14 is connected to the other end of the second stage of the transformer T1 through an inductor.
A controller (not specifically shown in fig. 3) may be respectively connected to the driving terminals of the first to eighth switching tubes Q7 to Q14, and controls the first and fourth switching tubes Q7 and Q10, the second and third switching tubes Q8 and Q9, the fifth and eighth switching tubes Q11 and Q14, the sixth switching tube Q12 and the seventh switching tube Q13 to be synchronously turned on or off by inputting corresponding PWM control signals to the driving terminals of the first to eighth switching tubes Q7 to Q14, so that the high-voltage battery pack precharges the second precharge capacitor C2 through the second control submodule 220, the transformer T1 and the first control submodule 210.
As will be described in detail below with reference to the specific embodiment, the controller controls the first to eighth switching tubes Q7 to Q14 accordingly, so that the high voltage battery pack charges and precharges the second precharge capacitor C2 through the second control sub-module 220, the transformer T1 and the first control sub-module 210.
According to an embodiment of the invention, the controller is configured to control the fifth switching tube Q11 and the eighth switching tube Q14 to be turned on, control the sixth switching tube Q12 and the seventh switching tube Q13 to be turned off, control the first switching tube Q7 and the fourth switching tube Q10 to be turned on, and control the second switching tube Q8 and the third switching tube Q9 to be turned off when the second pre-charge capacitor is pre-charged, so as to control the high voltage dc module 200 to be in the first mode.
According to another embodiment of the present invention, the controller is configured to control the fifth switching tube Q11 and the eighth switching tube Q14 to turn off, control the sixth switching tube Q12 and the seventh switching tube Q13 to turn on, control the first switching tube Q7 and the fourth switching tube Q10 to turn off, and control the second switching tube Q8 and the third switching tube Q9 to turn on when the second pre-charge capacitor is pre-charged, so as to control the high voltage dc module 200 to be in the second mode.
According to an embodiment of the present invention, the controller is configured to control the switching states of the first to eighth switching tubes Q7 to Q14 at a preset switching frequency, so as to control the high voltage dc module to switch between the first mode and the second mode at the preset switching frequency.
Specifically, during the process of precharging the second precharge capacitor C2, the operating states of the high voltage dc module can be divided into a first mode and a second mode by correspondingly controlling the switching states of the first to eighth switching tubes Q7 to Q14. When the controller inputs corresponding PWM control signals to the driving terminals of the first to eighth switching transistors Q7 to Q14, the first to eighth switching transistors Q7 to Q14 may be controlled to be turned on or off at a predetermined switching frequency, so that the high voltage dc module may be controlled to be switched between the first mode and the second mode at the predetermined switching frequency (e.g., tens to hundreds of kilohertz), such that the transformer generates an induced current, and the second precharge capacitor C2 is precharged by the induced current.
Specifically, when the high voltage dc module 200 is controlled to switch from the second mode to the first mode, as shown in fig. 3, the controller may input corresponding PWM control signals to the driving terminals of the fifth to eighth switching tubes Q11 to Q14 to control the fifth and eighth switching tubes Q11 and Q14 to be turned on and control the sixth and seventh switching tubes Q12 and Q13 to be turned off, the high voltage battery pack, the fifth switching tube Q11, the second stage of the transformer T1 and the eighth switching tube Q14 may form a loop, at this time, the first stage of the transformer T1 may be equivalent to a power supply with positive and negative top, the controller may input corresponding PWM control signals to the driving terminals of the first to fourth switching tubes Q7 to Q10 to control the first to Q7 and the fourth switching tube Q10 to be turned on and control the second to Q8 and the third to Q9 to turn off, so that the first to fourth switching tubes Q3527, Q2 and the fourth switching tube Q2 and the pre-charging tube 2, the current may precharge the second precharge capacitor C2 in a top-down direction.
Further, when the high voltage dc module 200 is controlled to switch from the first mode to the second mode, as shown in fig. 3, the controller may input corresponding PWM control signals to the driving terminals of the fifth to eighth switching tubes Q11 to Q14 to control the fifth and eighth switching tubes Q11 and Q14 to be turned off and control the sixth and seventh switching tubes Q12 and Q13 to be turned on, the high voltage battery pack, the seventh switching tube Q13, the second stage of the transformer T1 and the sixth switching tube Q12 may form a loop, at this time, the first stage of the transformer T1 may be equivalent to a power supply with positive polarities at the top and bottom, the controller may input corresponding PWM control signals to the driving terminals of the first to fourth switching tubes Q59638 to Q10 to control the first to Q7 and the fourth to Q10 to be turned off and simultaneously control the second to switch tube Q8 and the third to Q9 to turn on the second stage of the transformer T59623, the second to form a pre-charging circuit with the second to the second switching tube Q638, the current may still precharge the second precharge capacitor C2 in a top-down direction.
It should be noted that, the turns ratio of the first-stage coil and the second-stage coil of the transformer in the above embodiment may be calibrated according to actual conditions, and the ends with the same name of the two stages of the transformer in the above embodiment are all in the same direction. Certainly, in other embodiments of the present invention, the two stages of the transformer may have the same-name terminals in different directions, and at this time, the first to eighth switching tubes Q7 to Q14 are correspondingly controlled, and the high-voltage dc module may also be controlled to precharge the second precharge capacitor.
In summary, according to the charger of the electric vehicle in the embodiment of the invention, the controller may control the high voltage dc module to pre-charge the second pre-charge capacitor, after the voltage of the second pre-charge capacitor is greater than the first preset threshold and smaller than the second preset threshold, the pre-charge switch is closed to charge the first pre-charge capacitor through the power grid, and after the pre-charge of the first pre-charge capacitor is completed, the ac switch is closed. Therefore, the time of pre-charging can be greatly reduced, so that the generation of large current when the relay is attracted is effectively avoided, the relay is prevented from being sintered, and the reliability of the system is improved.
In addition, the embodiment of the invention also provides an electric automobile which comprises the charger of the electric automobile.
According to the electric automobile provided by the embodiment of the invention, the pre-charging time can be greatly reduced, so that the generation of larger current when the relay is attracted is effectively avoided, the relay is prevented from being sintered, and the reliability of the system is improved.
Fig. 4 is a flowchart of a charger control method of an electric vehicle according to an embodiment of the present invention.
As shown in fig. 1, the charger for an electric vehicle according to an embodiment of the present invention may include: the high-voltage battery pack charging system comprises a pre-charging switch, a pre-charging resistor, a first pre-charging capacitor, an alternating current switch, an alternating current module, a second pre-charging capacitor and a high-voltage direct current module, wherein the pre-charging resistor is connected with the first pre-charging capacitor and the pre-charging switch respectively, the alternating current module is connected with the alternating current switch, the pre-charging resistor and the first pre-charging capacitor, the second pre-charging capacitor is connected with the alternating current module in parallel, and the high-voltage direct current module is connected with the second pre.
As shown in fig. 4, the method for controlling a charger of an electric vehicle according to an embodiment of the present invention may include the following steps:
and S1, controlling the high-voltage direct current module to pre-charge the second pre-charge capacitor.
And S2, after the voltage of the second pre-charge capacitor is greater than the first preset threshold and less than the second preset threshold, closing the pre-charge switch to charge the first pre-charge capacitor through the power grid.
S3, after the first pre-charge capacitor completes pre-charging, the ac switch is closed.
According to an embodiment of the present invention, the first preset threshold may be a peak voltage of a power grid, the second preset threshold may be a minimum value of withstand voltages of a switching tube and a second pre-charge capacitor, and the switching tube is a switching tube in an ac module and a high voltage dc module.
According to one embodiment of the invention, the high-voltage direct current module comprises a first control submodule, a transformer and a second control submodule, the first control submodule is connected with a second pre-charging capacitor in parallel and comprises a first switching tube to a fourth switching tube, a first stage of the transformer is connected with the first control submodule, the second control submodule is respectively connected with a high-voltage battery pack and a second stage of the transformer, the second control submodule comprises a fifth switching tube to an eighth switching tube, and the charger control method of the electric automobile comprises the following steps: when the second pre-charging capacitor is pre-charged, the fifth switching tube and the eighth switching tube are controlled to be conducted, the sixth switching tube and the seventh switching tube are controlled to be turned off, the first switching tube and the fourth switching tube are controlled to be conducted, and the second switching tube and the third switching tube are controlled to be turned off simultaneously, so that the high-voltage direct-current module is controlled to be in the first mode.
According to an embodiment of the present invention, the charger control method of the electric vehicle further includes: the high-voltage direct current module is used for controlling the fifth switching tube and the eighth switching tube to be switched off, controlling the sixth switching tube and the seventh switching tube to be switched on, controlling the first switching tube and the fourth switching tube to be switched off, and controlling the second switching tube and the third switching tube to be switched on simultaneously when the second pre-charging capacitor is pre-charged so as to control the high-voltage direct current module to be in a second mode.
According to an embodiment of the present invention, the charger control method of the electric vehicle further includes: and controlling the switching states of the first switching tube to the eighth switching tube by a preset switching frequency so as to control the high-voltage direct current module to switch between the first mode and the second mode by the preset switching frequency.
It should be noted that details that are not disclosed in the charger control method of the electric vehicle according to the embodiment of the present invention refer to details that are disclosed in the charger of the electric vehicle according to the embodiment of the present invention, and detailed descriptions thereof are omitted here.
According to the charger control method of the electric automobile, the high-voltage direct-current module is controlled by the controller to pre-charge the second pre-charging capacitor, after the voltage of the second pre-charging capacitor is larger than a first preset threshold and smaller than a second preset threshold, the pre-charging switch is closed to charge the first pre-charging capacitor through the power grid, and after the pre-charging of the first pre-charging capacitor is completed, the alternating-current switch is closed. Therefore, the time of pre-charging can be greatly reduced, so that the generation of large current when the relay is attracted is effectively avoided, the relay is prevented from being sintered, and the reliability of the system is improved.
In addition, an embodiment of the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the above-mentioned charger control method for an electric vehicle.
According to the non-transitory computer readable storage medium provided by the embodiment of the invention, the pre-charging time can be greatly reduced, so that the generation of a larger current when the relay is attracted is effectively avoided, the relay is prevented from being sintered, and the reliability of the system is improved.
In addition, an embodiment of the present invention further provides an electronic device, including: the charger control method of the electric automobile is realized when the processor executes the program.
According to the electronic equipment provided by the embodiment of the invention, the pre-charging time can be greatly reduced, so that the generation of larger current when the relay is attracted is effectively avoided, the relay is prevented from being sintered, and the reliability of the system is improved.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In addition, in the description of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (14)
1. A charger for an electric vehicle, comprising:
a pre-charging switch;
the pre-charging resistor and the first pre-charging capacitor are connected with the pre-charging switch;
an AC switch;
the alternating current module is connected with the alternating current switch, the pre-charging resistor and the first pre-charging capacitor;
the second pre-charging capacitor is connected with the alternating current module in parallel;
the high-voltage direct current module is connected with the second pre-charging capacitor in parallel and is connected with a high-voltage battery pack;
the controller is used for controlling the high-voltage direct-current module to pre-charge the second pre-charge capacitor, closing the pre-charge switch to charge the first pre-charge capacitor through a power grid after the voltage of the second pre-charge capacitor is greater than a first preset threshold and smaller than a second preset threshold, and closing the alternating-current switch after the pre-charge of the first pre-charge capacitor is completed.
2. The electric vehicle charger according to claim 1, wherein the first predetermined threshold is a peak voltage of the power grid, the second predetermined threshold is a minimum voltage of a switch tube and a withstand voltage of the second pre-charge capacitor, and the switch tube is a switch tube in the ac module and the high voltage dc module.
3. The electric vehicle charger of claim 1, wherein the high voltage dc module comprises:
the first control submodule is connected with the second pre-charging capacitor in parallel and comprises a first switching tube to a fourth switching tube;
the first stage of the transformer is connected with the first control submodule;
and the second control submodule is connected with the second stage of the transformer and comprises a fifth switching tube to an eighth switching tube.
4. The charger for electric vehicles according to claim 3,
the controller is used for controlling the fifth switch tube and the eighth switch tube to be conducted, controlling the sixth switch tube and the seventh switch tube to be turned off, controlling the first switch tube and the fourth switch tube to be conducted, and simultaneously controlling the second switch tube and the third switch tube to be turned off when the second pre-charging capacitor is pre-charged so as to control the high-voltage direct-current module to be in a first mode.
5. The charger for electric vehicles according to claim 4,
the controller is configured to control the fifth switching tube and the eighth switching tube to be turned off, control the sixth switching tube and the seventh switching tube to be turned on, control the first switching tube and the fourth switching tube to be turned off, and control the second switching tube and the third switching tube to be turned on simultaneously when the second pre-charge capacitor is pre-charged, so as to control the high-voltage direct-current module to be in a second mode.
6. The charger for electric vehicles according to claim 5,
the controller is configured to control the switching states of the first switching tube to the eighth switching tube at a preset switching frequency, so as to control the high-voltage direct-current module to switch between the first mode and the second mode at the preset switching frequency.
7. An electric vehicle characterized by comprising the charger for an electric vehicle according to any one of claims 1 to 6.
8. A charger control method of an electric vehicle, characterized in that the charger of the electric vehicle comprises: the control method of the charger of the electric automobile comprises the following steps that a pre-charging switch, a pre-charging resistor, a first pre-charging capacitor, an alternating current switch, an alternating current module, a second pre-charging capacitor and a high-voltage direct current module are arranged, the pre-charging resistor is respectively connected with the first pre-charging capacitor and the pre-charging switch, the alternating current module is connected with the alternating current switch, the pre-charging resistor and the first pre-charging capacitor, the second pre-charging capacitor is connected with the alternating current module in parallel, the high-voltage direct current module is connected with the second pre-charging capacitor in parallel and is connected with a high-:
controlling the high-voltage direct current module to pre-charge the second pre-charge capacitor;
after the voltage of the second pre-charging capacitor is greater than a first preset threshold and smaller than a second preset threshold, closing the pre-charging switch to charge the first pre-charging capacitor through the power grid;
after the first pre-charging capacitor completes pre-charging, the alternating current switch is closed.
9. The method for controlling the charger of the electric vehicle according to claim 8, wherein the first preset threshold is a peak voltage of the power grid, the second preset threshold is a minimum value of withstand voltages of a switch tube and the second pre-charge capacitor, and the switch tube is a switch tube in the ac module and the high voltage dc module.
10. The charger control method of the electric vehicle according to claim 8, wherein the high voltage direct current module comprises a first control submodule, a transformer and a second control submodule, the first control submodule is connected with the second pre-charging capacitor in parallel, the first control submodule comprises a first switch tube to a fourth switch tube, a first stage of the transformer is connected with the first control submodule, the second control submodule is respectively connected with the high voltage battery pack and a second stage of the transformer, the second control submodule comprises a fifth switch tube to an eighth switch tube, and the charger control method of the electric vehicle comprises:
when the second pre-charging capacitor is pre-charged, the fifth switching tube and the eighth switching tube are controlled to be conducted, the sixth switching tube and the seventh switching tube are controlled to be turned off, the first switching tube and the fourth switching tube are controlled to be conducted, and the second switching tube and the third switching tube are controlled to be turned off simultaneously, so that the high-voltage direct-current module is controlled to be in a first mode.
11. The charger control method of an electric vehicle according to claim 10, further comprising:
when the second pre-charging capacitor is pre-charged, the fifth switching tube and the eighth switching tube are controlled to be turned off, the sixth switching tube Q12 and the seventh switching tube Q13 are controlled to be turned on, the first switching tube and the fourth switching tube are controlled to be turned off, and meanwhile the second switching tube and the third switching tube are controlled to be turned on, so that the high-voltage direct-current module is controlled to be in a second mode.
12. The method for controlling a charger of an electric vehicle according to claim 11, further comprising:
and controlling the switching states of the first switching tube to the eighth switching tube at a preset switching frequency so as to control the high-voltage direct current module to switch between the first mode and the second mode at the preset switching frequency.
13. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that the program, when executed by a processor, implements the charger control method for an electric vehicle according to any one of claims 8 to 12.
14. An electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the charger control method for an electric vehicle according to any one of claims 8 to 12 when executing the program.
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| CN201811459282.6A CN111251911B (en) | 2018-11-30 | 2018-11-30 | Electric automobile, charger thereof and charger control method |
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| CN201811459282.6A CN111251911B (en) | 2018-11-30 | 2018-11-30 | Electric automobile, charger thereof and charger control method |
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