Charging device and electric vehicle

Abstract

The embodiment of the invention provides a charging device and an electric vehicle. The charging device comprises a primary side bridge arm module, a primary side switching module, a transformer module, a secondary side switching module, a secondary side bridge arm module and a control module. The transformer module comprises a first transformer, a second transformer and a third transformer; the control module is used for controlling the switching state of the change-over switch in the primary side switching module and the switching state of the change-over switch in the secondary side switching module under the condition that the input end of the primary side bridge arm module inputs voltage, so that the primary side switching module and the secondary side switching module are in different connection structures; wherein under the condition that the primary side switching module and the secondary side switching module are in different connection structures, the ranges of the output voltage of the output end of the secondary side bridge arm module are different. According to the embodiment of the invention, the output voltage range of the charging device can be widened.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a charging device and an electric vehicle. Background Art

[0002] As the range and charging speed of electric vehicles continue to improve, automakers are gradually launching high-power charging devices. However, the output voltage range of current charging devices is relatively narrow and cannot be applied to more usage scenarios. Summary of the invention

[0003] The embodiments of the present application provide a charging device and an electric vehicle, which can expand the output voltage range of the charging device.

[0004] A first aspect of an embodiment of the present application provides a charging device, including a primary bridge arm module, a primary switching module, a transformer module, a secondary switching module, a secondary bridge arm module and a control module; the transformer module includes a first transformer, a second transformer and a third transformer;

[0005] The first output end of the primary bridge arm module is connected to the first end of the primary switching module, the second output end of the primary bridge arm module is connected to the second end of the primary switching module, and the third output end of the primary bridge arm module is connected to the third end of the primary switching module; the fourth end of the primary switching module is connected to the primary first end of the first transformer, the fifth end of the primary switching module is connected to the primary second end of the first transformer, the sixth end of the primary switching module is connected to the primary first end of the second transformer, the seventh end of the primary switching module is connected to the primary second end of the second transformer, the eighth end of the primary switching module is connected to the primary first end of the third transformer, and the ninth end of the primary switching module is connected to the primary second end of the third transformer. The second end of the primary side; the first end of the secondary side of the first transformer is connected to the first end of the secondary side switching module, the second end of the secondary side of the first transformer is connected to the second end of the secondary side switching module, the first end of the secondary side of the second transformer is connected to the third end of the secondary side switching module, the second end of the secondary side of the second transformer is connected to the fourth end of the secondary side switching module, the first end of the secondary side of the third transformer is connected to the fifth end of the secondary side switching module, and the second end of the secondary side of the third transformer is connected to the sixth end of the secondary side switching module; the seventh end of the secondary side switching module is connected to the first input end of the secondary side bridge arm module, the eighth end of the secondary side switching module is connected to the second input end of the secondary side bridge arm module, and the ninth end of the secondary side switching module is connected to the third input end of the secondary side bridge arm module;

[0006] The control module is used to control the switching state of the switching switch in the primary switching module and the switching state of the switching switch in the secondary switching module when a voltage is input to the input end of the primary bridge arm module, so that the primary switching module and the secondary switching module are in different connection structures; wherein, when the primary switching module and the secondary switching module are in different connection structures, the range of the output voltage at the output end of the secondary bridge arm module is different.

[0007] Optionally, the primary switching module includes a first inductor, a second inductor, a third inductor, a first capacitor, a second capacitor, a third capacitor, a first switch, a second switch and a third switch; the first end of the first capacitor is connected to the first output end of the primary bridge arm module, the second end of the first capacitor is connected to the first end of the first inductor and the second end of the third switch, the first end of the second capacitor is connected to the second output end of the primary bridge arm module, the second end of the second capacitor is connected to the first end of the second inductor and the second end of the first switch, the first end of the third capacitor is connected to the third output end of the primary bridge arm module, and the second end of the third capacitor is connected to the A first end of the third inductor is connected to a second end of the second switch, the second end of the first inductor is connected to a first end of the primary side of the first transformer, the second end of the primary side of the first transformer is connected to a first end of the first switch, the third end of the first switch is connected to a third end of the second switch and a third end of the third switch, the second end of the second inductor is connected to a first end of the primary side of the second transformer, the second end of the primary side of the second transformer is connected to a first end of the second switch, the second end of the third inductor is connected to a first end of the primary side of the third transformer, and the second end of the primary side of the third transformer is connected to a first end of the third switch.

[0008] Optionally, the secondary side switching module includes a fourth capacitor, a fifth capacitor, a sixth capacitor, a fourth switching switch, a fifth switching switch and a sixth switching switch; the first end of the secondary side of the first transformer is connected to the first end of the fourth capacitor and the second end of the sixth switching switch, the second end of the fourth capacitor is connected to the first input end of the secondary side bridge arm module, the second end of the secondary side of the first transformer is connected to the first end of the fourth switching switch, the second end of the fourth switching switch is connected to the first end of the secondary side of the second transformer and the first end of the fifth capacitor, the second end of the fifth capacitor is connected to the second input end of the secondary side bridge arm module, the third end of the fourth switching switch is connected to the third end of the fifth switching switch and the third end of the sixth switching switch; the second end of the secondary side of the second transformer is connected to the first end of the fifth switching switch, the second end of the fifth switching switch is connected to the first end of the secondary side of the third transformer and the first end of the sixth capacitor, the second end of the sixth capacitor is connected to the third input end of the secondary side bridge arm module, and the second end of the secondary side of the third transformer is connected to the first end of the sixth switch.

[0009] Optionally, the control module is used to control the switching state of the switch in the primary switching module and the switching state of the switch in the secondary switching module when a voltage is input to the input end of the primary bridge arm module, so that the primary switching module and the secondary switching module are in different connection structures, including:

[0010] The control module is used to control the first end of the first switch to be connected to the third end of the first switch, the first end of the second switch to be connected to the third end of the second switch, and the first end of the third switch to be connected to the third end of the third switch, so that the primary switching module is in a Y-type connection structure;

[0011] The control module is further used to control the first end of the first switch to be connected to the second end of the first switch, the first end of the second switch to be connected to the second end of the second switch, and the first end of the third switch to be connected to the second end of the third switch, so that the primary switching module is in a triangle connection structure;

[0012] The control module is further used to control the first end of the fourth switch to be connected to the third end of the fourth switch, the first end of the fifth switch to be connected to the third end of the fifth switch, and the first end of the sixth switch to be connected to the third end of the sixth switch, so that the secondary side switching module is in a Y-type connection structure;

[0013] The control module is further used to control the first end of the fourth switching switch to be connected to the second end of the fourth switching switch, the first end of the fifth switching switch to be connected to the second end of the fifth switching switch, and the first end of the sixth switching switch to be connected to the second end of the sixth switching switch, so that the secondary side switching module is in a triangle connection structure.

[0014] Optionally, when the primary switching module is in a Y-type connection structure, and the secondary switching module is in a Y-type connection structure, the output voltage range of the rectifier module is a first voltage range;

[0015] When the primary switching module is in a triangle connection structure, and the secondary switching module is in a triangle connection structure, the output voltage range of the rectifier module is a second voltage range;

[0016] Among them, the upper limit value of the first voltage range is smaller than the upper limit value of the second voltage range, and the lower limit value of the first voltage range is smaller than the lower limit value of the second voltage range.

[0017] Optionally, the primary bridge arm module includes: a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube and a sixth switch tube;

[0018] The first end of the primary switching module is connected to the first end of the first switch tube and the first end of the fourth switch tube, the second end of the primary switching module is connected to the first end of the second switch tube and the first end of the fifth switch tube, the third end of the primary switching module is connected to the first end of the third switch tube and the first end of the sixth switch tube, the second end of the first switch tube is connected to the second end of the second switch tube and the second end of the third switch tube, and the second end of the fourth switch tube is connected to the second end of the fifth switch tube and the second end of the sixth switch tube.

[0019] Optionally, the secondary bridge arm module includes: a seventh switch tube, an eighth switch tube, a ninth switch tube, a tenth switch tube, an eleventh switch tube and a twelfth switch tube;

[0020] The first end of the secondary side of the first transformer is connected to the first end of the seventh switch tube and the first end of the tenth switch tube, the first end of the secondary side of the second transformer is connected to the first end of the eighth switch tube and the first end of the eleventh switch tube, the first end of the secondary side of the third transformer is connected to the first end of the ninth switch tube and the first end of the twelfth switch tube, the second end of the seventh switch tube is connected to the second end of the eighth switch tube and the second end of the ninth switch tube, and the second end of the tenth switch tube is connected to the second end of the eleventh switch tube and the second end of the twelfth switch tube.

[0021] Optionally, the phase difference between the driving signal of the first switch tube, the driving signal of the second switch tube and the driving signal of the third switch tube is 120°, the phase between the driving signal of the first switch tube and the driving signal of the fourth switch tube are complementary, the phase between the driving signal of the second switch tube and the driving signal of the fifth switch tube are complementary, the phase between the driving signal of the third switch tube and the driving signal of the sixth switch tube are complementary, the phase between the driving signal of the seventh switch tube and the driving signal of the tenth switch tube are complementary, the phase between the driving signal of the eighth switch tube and the driving signal of the eleventh switch tube are complementary, and the phase between the driving signal of the ninth switch tube and the driving signal of the twelfth switch tube are complementary.

[0022] Optionally, the charging device further includes a first filtering module and a second filtering module, the first filtering module is connected between the second end of the first switching tube and the second end of the fourth switching tube, and the second filtering module is connected between the second end of the seventh switching tube and the second end of the tenth switching tube.

[0023] A second aspect of the embodiments of the present application provides an electric vehicle, comprising a charging device and a battery as described in any one of the first aspects of the embodiments of the present application.

[0024] In the charging device of the embodiment of the present application, the control module can control the switching state of the switching switch in the primary switching module and the switching state of the switching switch in the secondary switching module when a voltage is input to the input end of the primary bridge arm module, so that the primary switching module and the secondary switching module are in different connection structures. When the primary switching module and the secondary switching module are in different connection structures, the output voltage range of the output end of the secondary bridge arm module is different, thereby widening the output voltage range of the charging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 is a structural schematic diagram of a charging device provided in an embodiment of the present application;

[0027] Figure 2 is a schematic diagram of a specific structure of a charging device provided in an embodiment of the present application;

[0028] Figure 3 This embodiment of the present application provides a method based on Figure 2 A schematic diagram of a circuit structure in which the primary side switching module of the charging device is in a Y-type connection structure, and the secondary side switching module is in a Y-type connection structure;

[0029] Figure 4 This embodiment of the present application provides a method based on Figure 2 A schematic diagram of a circuit structure in which the primary side switching module of the charging device is in a triangle connection structure, and the secondary side switching module is in a triangle connection structure;

[0030] Figure 5 is a schematic diagram of an equivalent circuit provided in an embodiment of the present application;

[0031] Figure 6 This embodiment of the present application provides a method based on Figure 3 Schematic diagram of circuit simulation results of the circuit structure;

[0032] Figure 7 This embodiment of the present application provides a method based on Figure 4 Schematic diagram of circuit simulation results of the circuit structure;

[0033] Figure 8 It is a structural schematic diagram of an electric vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0035] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, products or devices.

[0036] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0037] See also Figure 1 , Figure 1 Schematic diagram of a charging device provided in an embodiment of the present application. Figure 1 As shown, the charging device 100 may include a primary bridge arm module 10, a primary switching module 20, a transformer module 30, a secondary switching module 40, a secondary bridge arm module 50 and a control module 60; the transformer module 30 includes a first transformer T1, a second transformer T2 and a third transformer T3;

[0038] The first output end of the primary bridge arm module 10 is connected to the first end of the primary switching module 20, the second output end of the primary bridge arm module 10 is connected to the second end of the primary switching module 20, and the third output end of the primary bridge arm module 10 is connected to the third end of the primary switching module 20; the fourth end of the primary switching module 20 is connected to the first primary end of the first transformer T1, the fifth end of the primary switching module 20 is connected to the second primary end of the first transformer T1, the sixth end of the primary switching module 20 is connected to the first primary end of the second transformer T2, the seventh end of the primary switching module 20 is connected to the second primary end of the second transformer T2, the eighth end of the primary switching module 20 is connected to the first primary end of the third transformer T3, and the ninth end of the primary switching module 20 is connected to the second primary end of the third transformer T3; the first The first end of the secondary side of the transformer T1 is connected to the first end of the secondary side switching module 40, the second end of the secondary side of the first transformer T1 is connected to the second end of the secondary side switching module 40, the first end of the secondary side of the second transformer T2 is connected to the third end of the secondary side switching module 40 and the second input end of the secondary side bridge arm module 50, the second end of the secondary side of the second transformer T2 is connected to the fourth end of the secondary side switching module 40, the first end of the secondary side of the third transformer T3 is connected to the fifth end of the secondary side switching module 40, and the second end of the secondary side of the third transformer T3 is connected to the sixth end of the secondary side switching module 40; the seventh end of the secondary side switching module 40 is connected to the first input end of the secondary side bridge arm module 50, the eighth end of the secondary side switching module 40 is connected to the second input end of the secondary side bridge arm module 50, and the ninth end of the secondary side switching module 40 is connected to the third input end of the secondary side bridge arm module 50;

[0039] The control module 60 is used to control the switching state of the switching switch in the primary switching module 20 and the switching state of the switching switch in the secondary switching module 40 when a voltage is input to the input end of the primary bridge arm module 10, so that the primary switching module 20 and the secondary switching module 40 are in different connection structures; wherein, when the primary switching module 20 and the secondary switching module 40 are in different connection structures, the range of the output voltage at the output end of the secondary bridge arm module 50 is different.

[0040] The charging device 100 of the embodiment of the present application can adopt a three-phase dual active bridge (DAB) charging device 100. Three-phase DAB is commonly used in high-power usage scenarios. The principle of DAB is to change the phase shift angle of the switch tube in the primary bridge arm module 10 and the secondary bridge arm module 50 by phase shifting, thereby changing the output voltage at the output end of the secondary bridge arm module 50. However, the effect of changing the output voltage at the output end of the secondary bridge arm module 50 by phase shifting is relatively limited. Under the premise that the charging device 100 can adopt three-phase DAB, the embodiment of the present application controls the switching state of the switching switch in the primary switching module 20 and the switching state of the switching switch in the secondary switching module 40, so that the primary switching module 20 and the secondary switching module 40 are in different connection structures, thereby more significantly changing the range of the output voltage of the output end of the secondary bridge arm module 50, thereby widening the output voltage range of the charging device 100.

[0041] The primary bridge arm module 10 may include a plurality of switch tubes. The control module 60 may control the on or off of the switch tubes in the primary bridge arm module 10, and control the on or off of the switch tubes in the secondary bridge arm module 50, and control the switching state of the switch in the primary switching module 20 and the switching state of the switch in the secondary switching module 40, thereby controlling the magnitude of the output voltage at the output end of the secondary bridge arm module 50. Exemplarily, the control module 60 may send a drive signal to the switch tubes in the primary bridge arm module 10 and the secondary bridge arm module 50 to control the on time and off time of the switch tubes in the primary bridge arm module 10 and the secondary bridge arm module 50 within one cycle. For example, the drive signal may be a pulse width modulation (PWM) signal. The frequency and duty cycle of the PWM signal may be determined by the control module 60.

[0042] In the charging device 100 of the embodiment of the present application, the control module 60 can control the switching state of the switching switch in the primary switching module 20 and the switching state of the switching switch in the secondary switching module 40 when a voltage is input to the input end of the primary bridge arm module 10, so that the primary switching module 20 and the secondary switching module 40 are in different connection structures. When the primary switching module 20 and the secondary switching module 40 are in different connection structures, the output voltage range of the output end of the secondary bridge arm module 50 is different, thereby widening the output voltage range of the charging device 100.

[0043] See also Figure 2 , Figure 2 It is a schematic diagram of the specific structure of a charging device provided in an embodiment of the present application. Figure 2 is Figure 1 Based on the obtained Figure 2 The control module is omitted), such as Figure 2 As shown, the primary switching module 20 includes a first inductor Lr1, a second inductor Lr2, a third inductor Lr3, a first capacitor Cr1, a second capacitor Cr2, a third capacitor Cr3, a first switch K1, a second switch K2 and a third switch K3; the first end of the first capacitor Cr1 is connected to the first output end of the primary bridge arm module 10, the second end of the first capacitor Cr1 is connected to the first end of the first inductor Lr1 and the second end of the third switch K3, the first end of the second capacitor Cr2 is connected to the second output end of the primary bridge arm module 10, the second end of the second capacitor Cr2 is connected to the first end of the second inductor Lr2 and the second end of the first switch K1, the first end of the third capacitor Cr3 is connected to the third output end of the primary bridge arm module 10, and the The second end of the third capacitor Cr3 is connected to the first end of the third inductor Lr3 and the second end of the second switch K2, the second end of the first inductor Lr1 is connected to the first end of the primary side of the first transformer T1, the second end of the primary side of the first transformer T1 is connected to the first end of the first switch K1, the third end of the first switch K1 is connected to the third end of the second switch K2 and the third end of the third switch K3, the second end of the second inductor Lr2 is connected to the first end of the primary side of the second transformer T2, the second end of the primary side of the second transformer T2 is connected to the first end of the second switch K2, the second end of the third inductor Lr3 is connected to the first end of the primary side of the third transformer T3, and the second end of the primary side of the third transformer T3 is connected to the first end of the third switch K3.

[0044] Figure 2In the figure, Vin is the input voltage of the charging device 100 (i.e., the voltage input to the input end of the primary bridge arm module 10), Vout is the output voltage of the charging device 100 (i.e., the output voltage of the output end of the secondary bridge arm module 50), and Rld is the load of the charging device 100, which may be a battery (e.g., a power battery of a vehicle).

[0045] The first inductor Lr1 , the second inductor Lr2 , and the third inductor Lr3 are energy storage devices that play a role in power conversion.

[0046] The first capacitor Cr1 , the second capacitor Cr2 and the third capacitor Cr3 can play a role of DC isolation (ie, blocking DC signals and allowing AC signals to pass through).

[0047] The first switch K1, the second switch K2 and the third switch K3 may be single-pole double-throw switches. The first end of the first switch K1 may be connected to the second end of the first switch K1 or the third end of the first switch K1, similarly, the first end of the second switch K2 may be connected to the second end of the second switch K2 or the third end of the second switch K2, and the first end of the third switch K3 may be connected to the second end of the third switch K3 or the third end of the third switch K3.

[0048] By changing the connection mode of the first switch K1 , the second switch K2 and the third switch K3 , the primary switching module 20 is placed in different connection structures.

[0049] Optional, such as Figure 2As shown, the secondary switching module 40 includes a fourth capacitor Cr4, a fifth capacitor Cr5, a sixth capacitor Cr6, a fourth switch K4, a fifth switch K5 and a sixth switch K6; the first end of the secondary side of the first transformer T1 is connected to the first end of the fourth capacitor Cr4 and the second end of the sixth switch K6, the second end of the fourth capacitor Cr4 is connected to the first input end of the secondary bridge arm module 50, the second end of the secondary side of the first transformer T1 is connected to the first end of the fourth switch K4, the second end of the fourth switch K4 is connected to the first end of the secondary side of the second transformer T2 and the first end of the fifth capacitor Cr5. end, the second end of the fifth capacitor Cr5 is connected to the second input end of the secondary bridge arm module 50, and the third end of the fourth switching switch K4 is connected to the third end of the fifth switching switch K5 and the third end of the sixth switching switch K6; the second end of the secondary side of the second transformer T2 is connected to the first end of the fifth switching switch K5, the second end of the fifth switching switch K5 is connected to the first end of the secondary side of the third transformer T3 and the first end of the sixth capacitor Cr6, the second end of the sixth capacitor Cr6 is connected to the third input end of the secondary bridge arm module 50, and the second end of the secondary side of the third transformer T3 is connected to the first end of the sixth switch K6.

[0050] In the embodiment of the present application, the fourth capacitor Cr4, the fifth capacitor Cr5, and the sixth capacitor Cr6 can play a role of direct current isolation.

[0051] The fourth switch K4, the fifth switch K5 and the sixth switch K6 may be single-pole double-throw switches. The first end of the fourth switch K4 may be connected to the second end of the fourth switch K4 or the third end of the fourth switch K4, similarly, the first end of the fifth switch K5 may be connected to the second end of the fifth switch K5 or the third end of the fifth switch K5, and the first end of the sixth switch K6 may be connected to the second end of the sixth switch K6 or the third end of the sixth switch K6.

[0052] By changing the connection mode of the fourth switch K4 , the fifth switch K5 and the sixth switch K6 , the secondary side switching module 40 is placed in different connection structures.

[0053] Optionally, the control module 60 is used to control the switching state of the switch in the primary switching module 20 and the switching state of the switch in the secondary switching module 40 when a voltage is input to the input end of the primary bridge arm module 10, so that the primary switching module 20 and the secondary switching module 40 are in different connection structures, including:

[0054] The control module 60 is used to control the first end of the first switch K1 to be connected to the third end of the first switch K1, the first end of the second switch K2 to be connected to the third end of the second switch K2, and the first end of the third switch K3 to be connected to the third end of the third switch K3, so that the primary switching module 20 is in a Y-type connection structure;

[0055] The control module 60 is further used to control the first end of the first switch K1 to be connected to the second end of the first switch K1, the first end of the second switch K2 to be connected to the second end of the second switch K2, and the first end of the third switch K3 to be connected to the second end of the third switch K3, so that the primary switching module 20 is in a triangle connection structure;

[0056] The control module 60 is further used to control the first end of the fourth switch K4 to be connected to the third end of the fourth switch K4, the first end of the fifth switch K5 to be connected to the third end of the fifth switch K5, and the first end of the sixth switch K6 to be connected to the third end of the sixth switch K6, so that the secondary side switching module 40 is in a Y-type connection structure;

[0057] The control module 60 is further used to control the first end of the fourth switching switch K4 to be connected to the second end of the fourth switching switch K4, the first end of the fifth switching switch K5 to be connected to the second end of the fifth switching switch K5, and the first end of the sixth switching switch K6 to be connected to the second end of the sixth switching switch K6, so that the secondary side switching module 40 is in a triangle connection structure.

[0058] In the embodiment of the present application, the control module 60 can control the connection mode of the first switch K1, the second switch K2 and the third switch K3 to make the primary switch module 20 in a triangle connection structure or a Y-type connection structure. The control module 60 can control the connection mode of the fourth switch K4, the fifth switch K5 and the sixth switch K6 to make the secondary switch module 40 in a triangle connection structure or a Y-type connection structure.

[0059] Optionally, the primary bridge arm module 10 includes: a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5 and a sixth switch tube Q6;

[0060] The first end of the primary switching module 20 is connected to the first end of the first switch tube Q1 and the first end of the fourth switch tube Q4, the second end of the primary switching module 20 is connected to the first end of the second switch tube Q2 and the first end of the fifth switch tube Q5, the third end of the primary switching module 20 is connected to the first end of the third switch tube Q3 and the first end of the sixth switch tube Q6, the second end of the first switch tube Q1 is connected to the second end of the second switch tube Q2 and the second end of the third switch tube Q3, and the second end of the fourth switch tube Q4 is connected to the second end of the fifth switch tube Q5 and the second end of the sixth switch tube Q6.

[0061] Optionally, the secondary bridge arm module 50 includes: a seventh switch tube Q7, an eighth switch tube Q8, a ninth switch tube Q9, a tenth switch tube Q10, an eleventh switch tube Q11 and a twelfth switch tube Q12;

[0062] The first end of the secondary side of the first transformer T1 is connected to the first end of the seventh switch tube Q7 and the first end of the tenth switch tube Q10, the first end of the secondary side of the second transformer T2 is connected to the first end of the eighth switch tube Q8 and the first end of the eleventh switch tube Q11, the first end of the secondary side of the third transformer T3 is connected to the first end of the ninth switch tube Q9 and the first end of the twelfth switch tube Q12, the second end of the seventh switch tube Q7 is connected to the second end of the eighth switch tube Q8 and the second end of the ninth switch tube Q9, and the second end of the tenth switch tube Q10 is connected to the second end of the eleventh switch tube Q11 and the second end of the twelfth switch tube Q12.

[0063] In the embodiment of the present application, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7, the eighth switch tube Q8, the ninth switch tube Q9, the tenth switch tube Q10, the eleventh switch tube Q11 and the twelfth switch tube Q12 can be metal oxide semiconductor field effect transistors (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET) or insulated gate bipolar transistors (Insulate-Gate Bipolar Transistor, IGBT).

[0064] Optionally, the phase difference between the driving signal of the first switch tube Q1, the driving signal of the second switch tube Q2 and the driving signal of the third switch tube Q3 is 120°, the phase between the driving signal of the first switch tube Q1 and the driving signal of the fourth switch tube Q4 is complementary, the phase between the driving signal of the second switch tube Q2 and the driving signal of the fifth switch tube Q5 is complementary, the phase between the driving signal of the third switch tube Q3 and the driving signal of the sixth switch tube Q6 is complementary, the phase between the driving signal of the seventh switch tube Q7 and the driving signal of the tenth switch tube Q10 is complementary, the phase between the driving signal of the eighth switch tube Q8 and the driving signal of the eleventh switch tube Q11 is complementary, and the phase between the driving signal of the ninth switch tube Q9 and the driving signal of the twelfth switch tube Q12 is complementary.

[0065] In the embodiment of the present application, the driving signal may be a periodic signal, and the period of each switch tube is the same. The phase difference between the driving signal of the first switch tube Q1, the driving signal of the second switch tube Q2, and the driving signal of the third switch tube Q3 is 120°, which means that the driving signal of the first switch tube Q1, the driving signal of the second switch tube Q2, and the driving signal of the third switch tube Q3 differ by one third of a period at the start conduction time point (for example, the start time point of the high level) of a period.

[0066] The phase complementarity between the two drive signals means that the high and low levels of the two drive signals are exactly opposite. The phase complementarity between the drive signal of the first switch tube Q1 and the drive signal of the fourth switch tube Q4 means that when the first switch tube Q1 is turned on, the fourth switch tube Q4 is turned off, and when the first switch tube Q1 is turned off, the fourth switch tube Q4 is turned on.

[0067] Optional, such as Figure 2 As shown, a first filter module (such as Figure 2 The first filtering module may include an input capacitor Cin or the first filtering module may include an input capacitor Cin and an input resistor in series ( Figure 2 not shown).

[0068] Optional, such as Figure 2 As shown, the second end of the seventh switch tube Q7 and the second end of the tenth switch tube Q10 can be connected through a second filtering module (such as Figure 2 The output capacitor Co shown in the figure is used for filtering, the second filtering module may include the output capacitor Co or the second filtering module may include the output capacitor Co and the output resistor in series ( Figure 2 not shown).

[0069] Optionally, when the primary switching module 20 is in a Y-type connection structure, and the secondary switching module 40 is in a Y-type connection structure, the output voltage range of the rectifier module is a first voltage range;

[0070] When the primary switching module 20 is in a triangle connection structure, and the secondary switching module 40 is in a triangle connection structure, the output voltage range of the rectifier module is a second voltage range;

[0071] Among them, the upper limit value of the first voltage range is smaller than the upper limit value of the second voltage range, and the lower limit value of the first voltage range is smaller than the lower limit value of the second voltage range.

[0072] The control module 60 can control the first end of the first switch K1 to be connected to the third end of the first switch K1 (i.e., the first switch K1 is closed), the first end of the second switch K2 to be connected to the third end of the second switch K2 (i.e., the second switch K2 is closed), the first end of the third switch K3 to be connected to the third end of the third switch K3 (i.e., the third switch K3 is closed), so that the primary side switching module 20 is in a Y-type connection structure, and control the first end of the fourth switch K4 to be connected to the third end of the fourth switch K4 (i.e., the fourth switch K4 is closed), the first end of the fifth switch K5 to be connected to the third end of the fifth switch K5 (i.e., the fifth switch K5 is closed), and the first end of the sixth switch K6 to be connected to the third end of the sixth switch K6 (i.e., the sixth switch K6 is closed), so that the secondary side switching module 40 is in a Y-type connection structure. Please refer to Figure 3 , Figure 3 This embodiment of the present application provides a method based on Figure 2Schematic diagram of a circuit structure in which the primary switching module of a charging device is in a Y-type connection structure, and the secondary switching module is in a Y-type connection structure. When the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, and the sixth switch K6 in the charging device 100 are all closed, the primary switching module 20 is in a Y-type connection structure, and the secondary switching module 40 is in a Y-type connection structure. At this time, when the charging device 100 is working, the phase difference between the driving signal of the first switch tube Q1, the driving signal of the second switch tube Q2 and the driving signal of the third switch tube Q3 is 120 degrees, the phase between the driving signal of the first switch tube Q1 and the driving signal of the fourth switch tube Q4 is complementary, the phase between the driving signal of the second switch tube Q2 and the driving signal of the fifth switch tube Q5 is complementary, the phase between the driving signal of the third switch tube Q3 and the driving signal of the sixth switch tube Q6 is complementary, the phase between the driving signal of the seventh switch tube Q7 and the driving signal of the tenth switch tube Q10 is complementary, the phase between the driving signal of the eighth switch tube Q8 and the driving signal of the eleventh switch tube Q11 is complementary, and the phase between the driving signal of the ninth switch tube Q9 and the driving signal of the twelfth switch tube Q12 is complementary. The first inductor Lr1 is connected in series with the first transformer T1, the second inductor Lr2 is connected in series with the second transformer T2, and the third inductor Lr3 is connected in series with the third transformer T3. By changing the phase shift angle of the switch tube in the primary bridge arm module 10 and the switch tube in the secondary bridge arm module 50, the effective high-level duty cycle at both ends of the first inductor Lr1, the effective high-level duty cycle at both ends of the second inductor Lr2, and the effective high-level duty cycle at both ends of the third inductor Lr3 are changed, and the load (for example, a power battery) is charged through isolation and energy conversion by the first transformer T1, the second transformer T2, and the third transformer T3. Among them, the second end of the first switch tube Q1 and the second end of the fourth switch tube Q4 can be filtered through the input capacitor Cin. The second end of the seventh switch tube Q7 and the second end of the tenth switch tube Q10 can be filtered through the output capacitor Co. Based on Figure 3 The circuit structure shown can change the phase shift angle of the switch tube in the primary bridge arm module 10 and the switch tube in the secondary bridge arm module 50, thereby changing the output voltage Vout of the charging device 100, so that the output voltage of the charging device 100 is within the first voltage range.

[0073] The control module 60 can control the first end of the first switch K1 to be connected to the second end of the first switch K1 (i.e., the first switch K1 is disconnected), the first end of the second switch K2 to be connected to the second end of the second switch K2 (i.e., the second switch K2 is disconnected), the first end of the third switch K3 to be connected to the second end of the third switch K3 (i.e., the third switch K3 is disconnected), so that the primary switch module 20 is in a triangle connection structure, and control the first end of the fourth switch K4 to be connected to the second end of the fourth switch K4 (i.e., the fourth switch K4 is disconnected), the first end of the fifth switch K5 to be connected to the second end of the fifth switch K5 (i.e., the fifth switch K5 is disconnected), and the first end of the sixth switch K6 to be connected to the second end of the sixth switch K6 (i.e., the sixth switch K6 is disconnected), so that the secondary switch module 40 is in a triangle connection structure. Please refer to Figure 4 , Figure 4 This embodiment of the present application provides a method based on Figure 2Schematic diagram of a circuit structure in which the primary switching module of a charging device is in a triangle connection structure, and the secondary switching module is in a triangle connection structure. When the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, and the sixth switch K6 in the charging device 100 are all disconnected, the primary switching module 20 is in a triangle connection structure (△-shaped connection), and the secondary switching module 40 is in a triangle connection structure (△-shaped connection). At this time, when the charging device 100 is working, the phase difference between the driving signal of the first switch tube Q1, the driving signal of the second switch tube Q2 and the driving signal of the third switch tube Q3 is 120 degrees, the phase between the driving signal of the first switch tube Q1 and the driving signal of the fourth switch tube Q4 is complementary, the phase between the driving signal of the second switch tube Q2 and the driving signal of the fifth switch tube Q5 is complementary, the phase between the driving signal of the third switch tube Q3 and the driving signal of the sixth switch tube Q6 is complementary, the phase between the driving signal of the seventh switch tube Q7 and the driving signal of the tenth switch tube Q10 is complementary, the phase between the driving signal of the eighth switch tube Q8 and the driving signal of the eleventh switch tube Q11 is complementary, and the phase between the driving signal of the ninth switch tube Q9 and the driving signal of the twelfth switch tube Q12 is complementary. The first inductor Lr1 is connected in series with the first transformer T1, the second inductor Lr2 is connected in series with the second transformer T2, and the third inductor Lr3 is connected in series with the third transformer T3. By changing the phase shift angle of the switch tube in the primary bridge arm module 10 and the switch tube in the secondary bridge arm module 50, the effective high-level duty cycle at both ends of the first inductor Lr1, the effective high-level duty cycle at both ends of the second inductor Lr2, and the effective high-level duty cycle at both ends of the third inductor Lr3 are changed, and the load (for example, a power battery) is charged through isolation and energy conversion by the first transformer T1, the second transformer T2, and the third transformer T3. Among them, the second end of the first switch tube Q1 and the second end of the fourth switch tube Q4 can be filtered through the input capacitor Cin. The second end of the seventh switch tube Q7 and the second end of the tenth switch tube Q10 can be filtered through the output capacitor Co. Based on Figure 4 The circuit structure shown can change the output voltage of the charging device 100 by changing the phase shift angle of the switch tube in the primary bridge arm module 10 and the switch tube in the secondary bridge arm module 50, so that the output voltage of the charging device 100 is within the second voltage range.

[0074] Changing the effective high-level duty cycle across the first inductor Lr1 refers to changing the voltage difference across the first inductor Lr1. When the input voltage of the charging device 100 is the same, the greater the voltage difference across the first inductor Lr1, the smaller the output voltage of the charging device 100, and the smaller the voltage difference across the first inductor Lr1, the greater the output voltage of the charging device 100.

[0075] See also Figure 5 , Figure 5 is a schematic diagram of an equivalent circuit provided in an embodiment of the present application. Figure 5 As shown, V AB yes Figure 3 or Figure 4 The voltage between point A (the connection point between the first switch tube Q1 and the fourth switch tube Q4) and point B (the connection point between the second switch tube Q2 and the fifth switch tube Q5) in CD yes Figure 3 or Figure 4 The voltage between point C (the connection point between the seventh switch tube Q7 and the tenth switch tube Q10) and point D (the connection point between the eighth switch tube Q8 and the eleventh switch tube Q11) in FIG. Figure 5 Yes V AB and V CD The equivalent circuit diagram of the voltage relationship between V AB and V CD It can be a square wave signal. L is the inductance between point A and point B. The larger L is, the greater the voltage across L is. AB When L is larger, V CD The smaller the input voltage Vin of the charging device 100 is, the smaller the AB The output voltage Vout of the charging device 100 is positively correlated with V CD Positive correlation. When the input voltage Vin of the charging device 100 is the same, the parameters of the components in the charging device 100 are the same, and the driving signal of each switch tube is the same, the output voltage Vout of the charging device 100 is negatively correlated with the size of L. When the primary switching module 20 is in a Y-type connection structure, and the secondary switching module 40 is in a Y-type connection structure, L is the sum of the inductance of the first inductor Lr1 and the second inductor Lr2; when the primary switching module 20 is in a triangle connection structure, and the secondary switching module 40 is in a triangle connection structure, L is the inductance of the first inductor Lr1. It can be seen that when other conditions are the same, when the primary switching module 20 is in a Y-type connection structure, and the secondary switching module 40 is in a Y-type connection structure, the output voltage Vout of the charging device 100 is relatively small, and when the primary switching module 20 is in a triangle connection structure, and the secondary switching module 40 is in a triangle connection structure, the output voltage Vout of the charging device 100 is relatively large.

[0076] See also Figure 6 , Figure 6 This embodiment of the present application provides a method based on Figure 3 Schematic diagram of circuit simulation results of the circuit structure. Figure 6The simulation parameters of the circuit simulation are: input voltage Vin = 400 volts (V), load Rld = 27.22 ohms (Ω), the inductance of the first inductor Lr1, the second inductor Lr2, and the third inductor Lr3 are all 15 microhenries (uH), the capacity of the first capacitor Cr1, the second capacitor Cr2, the third capacitor Cr3, the fourth capacitor Cr4, the fifth capacitor Cr5, and the sixth capacitor Cr6 are all 20 microfarads (uF), the excitation inductance of the first transformer T1, the second transformer T2, and the third transformer T3 are all 2 millihenries (mH), the frequency of the driving signal of each switch tube is 50 kilohertz (KHz), the primary-secondary phase shift angle (the conduction time difference between the switch tube of the primary bridge arm module 10 and the switch tube of the secondary bridge arm module 50) is 0.0813, and the output voltage Vout is about 701V.

[0077] See also Figure 7 , Figure 7 This embodiment of the present application provides a method based on Figure 4 Schematic diagram of circuit simulation results of the circuit structure. Figure 7 The simulation parameters of the circuit simulation are: input voltage Vin = 400 volts (V), load Rld = 27.22 ohms (Ω), the inductance of the first inductor Lr1, the second inductor Lr2, and the third inductor Lr3 are all 15 microhenries (uH), the capacity of the first capacitor Cr1, the second capacitor Cr2, the third capacitor Cr3, the fourth capacitor Cr4, the fifth capacitor Cr5, and the sixth capacitor Cr6 are all 20 microfarads (uF), the excitation inductance of the first transformer T1, the second transformer T2, and the third transformer T3 are all 2 millihenries (mH), the frequency of the driving signal of each switch tube is 50 kilohertz (KHz), the primary-secondary phase shift angle (the conduction time difference between the switch tube of the primary bridge arm module 10 and the switch tube of the secondary bridge arm module 50) is 0.0813, and the output voltage Vout is about 2258V.

[0078] from Figure 6 and Figure 7 It can be seen that, when other conditions are the same, Figure 4 The output voltage of the circuit structure is greater than Figure 3 The output voltage of the circuit structure. Figure 3 The circuit structure is suitable for low output voltage occasions. Figure 4 The circuit structure is suitable for high output voltage occasions. Therefore, by changing the primary switching module 20 and the secondary switching module 40 to different connection structures, the output voltage range of the charging device 100 can be changed, thereby widening the output voltage range of the charging device 100 to meet the voltage requirements of more scenarios.

[0079] See also Figure 8 , Figure 8 Schematic diagram of the structure of an electric vehicle provided in an embodiment of the present application. Figure 8 As shown, the electric vehicle may include a charging device 100 and a battery 200. The battery 200 may be a power battery on the vehicle.

[0080] Figure 8 The specific structure and working principle of the charging device 100 can be found in the above embodiment and will not be repeated here.

[0081] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0082] In the several embodiments provided in this application, it should be understood that the disclosed charging device and electric vehicle can be implemented in other ways. For example, the above-described charging device embodiments are only schematic, and the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

Claims

1. A charging device, characterized in that: It includes a primary bridge arm module, a primary switching module, a transformer module, a secondary switching module, a secondary bridge arm module and a control module; the transformer module includes a first transformer, a second transformer and a third transformer; The first output end of the primary bridge arm module is connected to the first end of the primary switching module, the second output end of the primary bridge arm module is connected to the second end of the primary switching module, and the third output end of the primary bridge arm module is connected to the third end of the primary switching module; the fourth end of the primary switching module is connected to the primary first end of the first transformer, the fifth end of the primary switching module is connected to the primary second end of the first transformer, the sixth end of the primary switching module is connected to the primary first end of the second transformer, the seventh end of the primary switching module is connected to the primary second end of the second transformer, the eighth end of the primary switching module is connected to the primary first end of the third transformer, and the ninth end of the primary switching module is connected to the primary second end of the third transformer. the second end of the primary side; the first end of the secondary side of the first transformer is connected to the first end of the secondary side switching module, the second end of the secondary side of the first transformer is connected to the second end of the secondary side switching module, the first end of the secondary side of the second transformer is connected to the third end of the secondary side switching module, the second end of the secondary side of the second transformer is connected to the fourth end of the secondary side switching module, the first end of the secondary side of the third transformer is connected to the fifth end of the secondary side switching module, and the second end of the secondary side of the third transformer is connected to the sixth end of the secondary side switching module; the seventh end of the secondary side switching module is connected to the first input end of the secondary side bridge arm module, the eighth end of the secondary side switching module is connected to the second input end of the secondary side bridge arm module, and the ninth end of the secondary side switching module is connected to the third input end of the secondary side bridge arm module; The control module is used to control the switching state of the switching switch in the primary side switching module and the switching state of the switching switch in the secondary side switching module when a voltage is input to the input end of the primary side bridge arm module, so that the primary side switching module and the secondary side switching module are in different connection structures; wherein, when the primary side switching module and the secondary side switching module are in different connection structures, the output voltage range of the output end of the secondary side bridge arm module is different.

2. The charging device according to claim 1, characterized in that The primary switching module includes a first inductor, a second inductor, a third inductor, a first capacitor, a second capacitor, a third capacitor, a first switch, a second switch and a third switch; the first end of the first capacitor is connected to the first output end of the primary bridge arm module, the second end of the first capacitor is connected to the first end of the first inductor and the second end of the third switch, the first end of the second capacitor is connected to the second output end of the primary bridge arm module, the second end of the second capacitor is connected to the first end of the second inductor and the second end of the first switch, the first end of the third capacitor is connected to the third output end of the primary bridge arm module, and the second end of the third capacitor is connected to The first end of the third inductor and the second end of the second switch, the second end of the first inductor is connected to the first end of the primary side of the first transformer, the second end of the primary side of the first transformer is connected to the first end of the first switch, the third end of the first switch is connected to the third end of the second switch and the third end of the third switch, the second end of the second inductor is connected to the first end of the primary side of the second transformer, the second end of the primary side of the second transformer is connected to the first end of the second switch, the second end of the third inductor is connected to the first end of the primary side of the third transformer, and the second end of the primary side of the third transformer is connected to the first end of the third switch.

3. The charging device according to claim 2, characterized in that The secondary side switching module includes a fourth capacitor, a fifth capacitor, a sixth capacitor, a fourth switch, a fifth switch and a sixth switch; the first end of the secondary side of the first transformer is connected to the first end of the fourth capacitor and the second end of the sixth switch, the second end of the fourth capacitor is connected to the first input end of the secondary side bridge arm module, the second end of the secondary side of the first transformer is connected to the first end of the fourth switch, the second end of the fourth switch is connected to the first end of the secondary side of the second transformer and the first end of the fifth capacitor, the second end of the fifth capacitor is connected to the second input end of the secondary side bridge arm module, the third end of the fourth switch is connected to the third end of the fifth switch and the third end of the sixth switch; the second end of the secondary side of the second transformer is connected to the first end of the fifth switch, the second end of the fifth switch is connected to the first end of the secondary side of the third transformer and the first end of the sixth capacitor, the second end of the sixth capacitor is connected to the third input end of the secondary side bridge arm module, and the second end of the secondary side of the third transformer is connected to the first end of the sixth switch.

4. The charging device according to claim 3, characterized in that The control module is configured to control the switching state of the switch in the primary switching module and the switching state of the switch in the secondary switching module when a voltage is input to the input end of the primary bridge arm module, so that the primary switching module and the secondary switching module are in different connection structures, including: the control module is configured to control the first end of the first switch to be connected to the third end of the first switch, the first end of the second switch to be connected to the third end of the second switch, and the first end of the third switch to be connected to the third end of the third switch, so that the primary switching module is in a Y-type connection structure; The control module is further configured to control the first end of the first switch to be connected to the second end of the first switch, the first end of the second switch to be connected to the second end of the second switch, and the first end of the third switch to be connected to the second end of the third switch, so that the primary switching module is in a triangle connection structure; The control module is further configured to control the first end of the fourth switch to be connected to the third end of the fourth switch, the first end of the fifth switch to be connected to the third end of the fifth switch, and the first end of the sixth switch to be connected to the third end of the sixth switch, so that the secondary side switching module is in a Y-type connection structure; The control module is further used to control the first end of the fourth switch to be connected to the second end of the fourth switch, the first end of the fifth switch to be connected to the second end of the fifth switch, and the first end of the sixth switch to be connected to the second end of the sixth switch, so that the secondary side switching module is in a triangle connection structure.

5. The charging device according to claim 4, characterized in that When the primary-side switching module is in a Y-type connection structure and the secondary-side switching module is in a Y-type connection structure, the output voltage range of the rectifier module is a first voltage range; When the primary switching module is in a triangle connection structure and the secondary switching module is in a triangle connection structure, the output voltage range of the rectifier module is a second voltage range; The upper limit of the first voltage range is smaller than the upper limit of the second voltage range, and the lower limit of the first voltage range is smaller than the lower limit of the second voltage range.

6. The charging device according to claim 1, wherein: The primary bridge arm module includes: a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube and a sixth switch tube; The first end of the primary switching module is connected to the first end of the first switching tube and the first end of the fourth switching tube, the second end of the primary switching module is connected to the first end of the second switching tube and the first end of the fifth switching tube, the third end of the primary switching module is connected to the first end of the third switching tube and the first end of the sixth switching tube, the second end of the first switching tube is connected to the second end of the second switching tube and the second end of the third switching tube, and the second end of the fourth switching tube is connected to the second end of the fifth switching tube and the second end of the sixth switching tube.

7. The charging device according to claim 6, characterized in that The secondary bridge arm module includes: a seventh switch tube, an eighth switch tube, a ninth switch tube, a tenth switch tube, an eleventh switch tube and a twelfth switch tube; The first end of the secondary side of the first transformer is connected to the first end of the seventh switching tube and the first end of the tenth switching tube, the first end of the secondary side of the second transformer is connected to the first end of the eighth switching tube and the first end of the eleventh switching tube, the first end of the secondary side of the third transformer is connected to the first end of the ninth switching tube and the first end of the twelfth switching tube, the second end of the seventh switching tube is connected to the second end of the eighth switching tube and the second end of the ninth switching tube, and the second end of the tenth switching tube is connected to the second end of the eleventh switching tube and the second end of the twelfth switching tube.

8. The charging device according to claim 7, characterized in that The phase difference between the drive signal of the first switching tube, the drive signal of the second switching tube, and the drive signal of the third switching tube is 120°. The phases of the drive signal of the first switching tube and the drive signal of the fourth switching tube are complementary. The phases of the drive signal of the second switching tube and the drive signal of the fifth switching tube are complementary. The phases of the drive signal of the third switching tube and the drive signal of the sixth switching tube are complementary. The phases of the drive signal of the seventh switching tube and the drive signal of the tenth switching tube are complementary. The phases of the drive signal of the eighth switching tube and the drive signal of the eleventh switching tube are complementary. The phases of the drive signal of the ninth switching tube and the drive signal of the twelfth switching tube are complementary.

9. The charging device according to claim 8, characterized in that The charging device also includes a first filter module and a second filter module. The first filter module is connected between the second end of the first switch tube and the second end of the fourth switch tube. The second filter module is connected between the second end of the seventh switch tube and the second end of the tenth switch tube.

10. An electric vehicle, characterized in that: The device comprises a charging device and a battery as claimed in any one of claims 1 to 9.

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