Charging device and electric vehicle

Abstract

The embodiment of the present application 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 a switching switch in the primary side switching module and the switching state of a switching switch in the secondary side switching module under the condition that the input voltage of the input end of the primary side bridge arm module is inputted, so that the primary side switching module and the secondary side switching module are in different connection structures; wherein the range of the output voltage of the output end of the secondary side bridge arm module is different under the condition that the primary side switching module and the secondary side switching module are in different connection structures. The embodiment of the present application can expand the output voltage range of the charging device.

Description

TECHNICAL FIELD

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

[0002] With the continuous improvement of the cruising range and charging speed of electric vehicles, car companies are gradually launching high-power charging devices. However, the output voltage range of the current charging device is narrow and cannot be applied to more use scenarios. SUMMARY

[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] The first aspect of the embodiments of the present application provides a charging device, comprising 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;

[0005] The first output end of the primary side bridge arm module is connected to the first end of the primary side switching module, the second output end of the primary side bridge arm module is connected to the second end of the primary side switching module, and the third output end of the primary side bridge arm module is connected to the third end of the primary side switching module; the fourth end of the primary side switching module is connected to the primary side first end of the first transformer, the fifth end of the primary side switching module is connected to the primary side second end of the first transformer, the sixth end of the primary side switching module is connected to the primary side first end of the second transformer, the seventh end of the primary side switching module is connected to the primary side second end of the second transformer, the eighth end of the primary side switching module is connected to the primary side first end of the third transformer, and the ninth end of the primary side switching module is connected to the primary side second end of the third transformer; the first end of the secondary side switching module is connected to the first end of the first transformer, the second end of the secondary side switching module is connected to the second end of the first transformer, the third end of the secondary side switching module is connected to the first end of the second transformer, the fourth end of the secondary side switching module is connected to the second end of the second transformer, the fifth end of the secondary side switching module is connected to the first end of the third transformer, and the sixth end of the secondary side switching module is connected to the second end of the third transformer; 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 configured to control switching states of the switching switches in the primary side switching module and the switching switches in the secondary side switching module to make the primary side switching module and the secondary side switching module in different connection structures in the case that the input voltage is input to the input end of the primary side bridge arm module; and the range of the output voltage of the output end of the secondary side bridge arm module is different in the case that the primary side switching module and the secondary side switching module are in different connection structures.

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

[0008] Optionally, the secondary side switching module comprises 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, and 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 switching switch.

[0009] Optionally, the control module is configured to, in the case that the input end of the primary side bridge arm module inputs a voltage, 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, so that the primary side switching module and the secondary side switching module are in different connection structures, and the control module comprises:

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

[0011] The control module is further configured to control the first end of the first switching switch and the second end of the first switching switch to be in communication, the first end of the second switching switch and the second end of the second switching switch to be in communication, and the first end of the third switching switch and the second end of the third switching switch to be in communication, so that the primary side switching module is in a triangular connection structure.

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

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

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

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

[0016] The upper limit value of the first voltage range is less than the upper limit value of the second voltage range, and the lower limit value of the first voltage range is less than the lower limit value of the second voltage range.

[0017] Optionally, the primary side bridge arm module comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, and a sixth switch.

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

[0019] Optionally, the secondary side bridge arm module comprises a seventh switch, an eighth switch, a ninth switch, a tenth switch, an eleventh switch, and a twelfth switch.

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

[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 of the driving signal of the first switch tube and the driving signal of the fourth switch tube is complementary, the phase of the driving signal of the second switch tube and the driving signal of the fifth switch tube is complementary, the phase of the driving signal of the third switch tube and the driving signal of the sixth switch tube is complementary, the phase of the driving signal of the seventh switch tube and the driving signal of the tenth switch tube is complementary, the phase of the driving signal of the eighth switch tube and the driving signal of the eleventh switch tube is complementary, and the phase of the driving signal of the ninth switch tube and the driving signal of the twelfth switch tube is complementary.

[0022] Optionally, the charging device further comprises 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, and the second filter module is connected between the second end of the seventh switch tube and the second end of the tenth switch tube.

[0023] The second aspect of the embodiment of the present application provides an electric vehicle comprising the charging device of any one of the first aspect of the embodiment of the present application and the battery.

[0024] The charging device of the embodiment of the present application can 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 under the condition that the input voltage of the primary side bridge arm module is input, so that the primary side switching module and the secondary side switching module are in different connection structures, and the range of the output voltage of the output end of the secondary side bridge arm module is different under the condition that the primary side switching module and the secondary side switching module are in different connection structures, thereby the range of the output voltage of the charging device can be widened. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

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

[0027] Figure 2 is a specific structural schematic diagram of a charging device provided by the embodiment of the present application;

[0028] Figure 3 is a specific structural schematic diagram of a charging device provided by the embodiment of the present application;Figure 2 The primary side switching module of the charging device is in a Y-shaped connection structure, and the secondary side switching module is in a Y-shaped connection structure.

[0029] Figure 4 The primary side switching module of the charging device is in a Y-shaped connection structure, and the secondary side switching module is in a Y-shaped connection structure. Figure 2 The primary side switching module of the charging device is in a Y-shaped connection structure, and the secondary side switching module is in a Y-shaped connection structure.

[0030] Figure 5 The primary side switching module of the charging device is in a Y-shaped connection structure, and the secondary side switching module is in a Y-shaped connection structure.

[0031] Figure 6 The primary side switching module of the charging device is in a Y-shaped connection structure, and the secondary side switching module is in a Y-shaped connection structure. Figure 3 The primary side switching module of the charging device is in a Y-shaped connection structure, and the secondary side switching module is in a Y-shaped connection structure.

[0032] Figure 7 The primary side switching module of the charging device is in a Y-shaped connection structure, and the secondary side switching module is in a Y-shaped connection structure. Figure 4 The primary side switching module of the charging device is in a Y-shaped connection structure, and the secondary side switching module is in a Y-shaped connection structure.

[0033] Figure 8 The primary side switching module of the charging device is in a Y-shaped connection structure, and the secondary side switching module is in a Y-shaped connection structure. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0035] The terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, product or device.

[0036] Reference to an "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As will be apparent to those of ordinary skill in the art, embodiments described in this application can be combined with other embodiments in various ways.

[0037] Reference is made to Figure 1 , Figure 1 Figure 1 is a schematic diagram of a charging device according to an embodiment of the application. As shown in Figure 1, the charging device 100 can include a primary bridge arm module 10, a primary switch module 20, a transformer module 30, a secondary switch 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. Figure 1 The first output end of the primary bridge arm module 10 is connected to the first end of the primary switch module 20, the second output end of the primary bridge arm module 10 is connected to the second end of the primary switch module 20, and the third output end of the primary bridge arm module 10 is connected to the third end of the primary switch module 20. The fourth end of the primary switch module 20 is connected to the primary first end of the first transformer T1, the fifth end of the primary switch module 20 is connected to the primary second end of the first transformer T1, the sixth end of the primary switch module 20 is connected to the primary first end of the second transformer T2, the seventh end of the primary switch module 20 is connected to the primary second end of the second transformer T2, the eighth end of the primary switch module 20 is connected to the primary first end of the third transformer T3, and the ninth end of the primary switch module 20 is connected to the primary second end of the third transformer T3. The primary first end of the first transformer T1 is connected to the first end of the secondary switch module 40, the primary second end of the first transformer T1 is connected to the second end of the secondary switch module 40, the primary first end of the second transformer T2 is connected to the third end of the secondary switch module 40 and the second input end of the secondary bridge arm module 50, the primary second end of the second transformer T2 is connected to the fourth end of the secondary switch module 40, the primary first end of the third transformer T3 is connected to the fifth end of the secondary switch module 40, and the primary second end of the third transformer T3 is connected to the sixth end of the secondary switch module 40. The seventh end of the secondary switch module 40 is connected to the first input end of the secondary bridge arm module 50, the eighth end of the secondary switch module 40 is connected to the second input end of the secondary bridge arm module 50, and the ninth end of the secondary switch module 40 is connected to the third input end of the secondary bridge arm module 50.

[0038]

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

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

[0041] The primary side bridge arm module 10 can include a plurality of switching tubes. The control module 60 can control the conduction or turn-off of the switching tubes in the primary side bridge arm module 10, and control the conduction or turn-off of the switching tubes in the secondary side bridge arm module 50, and control the switching state of the switching switch in the primary side switching module 20 and the switching state of the switching switch in the secondary side switching module 40, so as to control the size of the output voltage at the output end of the secondary side bridge arm module 50. For example, the control module 60 can send a driving signal to the switching tubes in the primary side bridge arm module 10 and the secondary side bridge arm module 50 to control the conduction time and the turn-off time of the switching tubes in the primary side bridge arm module 10 and the secondary side bridge arm module 50 in a cycle. For example, the driving signal can be a pulse width modulation (PWM) signal. The frequency and duty cycle of the PWM signal can be determined by the control module 60.

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

[0043] Please see Figure 2 , Figure 2 This is a schematic diagram of the specific structure of a charging device provided in an embodiment of this application. Figure 2 Is Figure 1 Based on ( Figure 2 (The control module is omitted in the text, such as...) Figure 2 As shown, the primary-side 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 switching switch K1, a second switching switch K2, and a third switching switch K3; the first terminal of the first capacitor Cr1 is connected to the first output terminal of the primary-side bridge arm module 10, the second terminal of the first capacitor Cr1 is connected to the first terminal of the first inductor Lr1 and the second terminal of the third switching switch K3, the first terminal of the second capacitor Cr2 is connected to the second output terminal of the primary-side bridge arm module 10, the second terminal of the second capacitor Cr2 is connected to the first terminal of the second inductor Lr2 and the second terminal of the first switching switch K1, and the first terminal of the third capacitor Cr3 is connected to the third output terminal of the primary-side bridge arm module 10. The second terminal of the third capacitor Cr3 is connected to the first terminal of the third inductor Lr3 and the second terminal of the second switch K2. The second terminal of the first inductor Lr1 is connected to the first terminal of the primary side of the first transformer T1. The second terminal of the primary side of the first transformer T1 is connected to the first terminal of the first switch K1. The third terminal of the first switch K1 is connected to the third terminal of the second switch K2 and the third terminal of the third switch K3. The second terminal of the second inductor Lr2 is connected to the first terminal of the primary side of the second transformer T2. The second terminal of the primary side of the second transformer T2 is connected to the first terminal of the second switch K2. The second terminal of the third inductor Lr3 is connected to the first terminal of the primary side of the third transformer T3. The second terminal of the primary side of the third transformer T3 is connected to the first terminal of the third switch K3.

[0044] Figure 2In the formula, Vin is the input voltage of the charging device 100 (i.e., the voltage input at 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 at the output end of the secondary bridge arm module 50), and Rld is the load of the charging device 100, which can be a battery (such as a power battery of a vehicle).

[0045] The first inductor Lr1, the second inductor Lr2, and the third inductor Lr3 are energy storage devices and serve the function of power conversion.

[0046] The first capacitor Cr1, the second capacitor Cr2, and the third capacitor Cr3 can serve the function of blocking direct current (i.e., blocking direct current signals and allowing alternating current signals to pass).

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

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

[0049] Optionally, as shown in FIG. 2, the primary bridge arm module 10 can further include a first rectifier D1, a second rectifier D2, and a third rectifier D3. Figure 2As shown, the secondary side switching module 40 includes a fourth capacitor Cr4, a fifth capacitor Cr5, a sixth capacitor Cr6, a fourth switching switch K4, a fifth switching switch K5 and a sixth switching 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 switching switch K6, the second end of the fourth capacitor Cr4 is connected to the first input end of the secondary side bridge arm module 50, the second end of the first transformer T1 is connected to the first end of the fourth switching switch K4, the second end of the fourth switching 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, the second end of the fifth capacitor Cr5 is connected to the second input end of the secondary side bridge arm module 50, 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 side bridge arm module 50, and the second end of the third transformer T3 is connected to the first end of the sixth switching switch K6.

[0050] In the embodiment of the present application, the fourth capacitor Cr4, the fifth capacitor Cr5 and the sixth capacitor Cr6 can function as a direct current blocking.

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

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

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

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

[0055] The control module 60 is further configured to control the first end of the first switch K1 and the second end of the first switch K1 to be in communication, the first end of the second switch K2 and the second end of the second switch K2 to be in communication, and the first end of the third switch K3 and the second end of the third switch K3 to be in communication, so that the primary side switching module 20 is in a triangular connection structure.

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

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

[0058] In the embodiment, the control module 60 can control the connection mode of the first switch K1, the second switch K2 and the third switch K3, so that the primary side switching module 20 is in a triangular 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, so that the secondary side switching module 40 is in a triangular connection structure or a Y-type connection structure.

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

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

[0061] Optionally, the secondary side bridge arm module 50 comprises a seventh switch Q7, an eighth switch Q8, a ninth switch Q9, a tenth switch Q10, an eleventh switch Q11 and a twelfth switch Q12.

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

[0063] In the embodiment of the present application, the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, the fifth switch Q5, the sixth switch Q6, the seventh switch Q7, the eighth switch Q8, the ninth switch Q9, the tenth switch Q10, the eleventh switch Q11 and the twelfth switch Q12 can adopt a metal-oxide-semiconductor field-effect transistor (MOSFET) or an insulate-gate bipolar transistor (IGBT).

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

[0065] In this embodiment, the driving signal can be a periodic signal, with each switch having the same period. The 120° phase difference between the driving signals of the first switch Q1, the second switch Q2, and the third switch Q3 means that the driving signals of the first switch Q1, the second switch Q2, and the third switch Q3 differ by one-third of a cycle between their starting conduction time points (e.g., the starting time of the high level).

[0066] The phase complementarity between 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 Q1 and the drive signal of the fourth switch Q4 means that when the first switch Q1 is turned on, the fourth switch Q4 is turned off, and when the first switch Q1 is turned off, the fourth switch Q4 is turned on.

[0067] Optional, such as Figure 2 As shown, the second terminal of the first switch Q1 and the second terminal of the fourth switch Q4 can be connected through the first filter module (such as...). Figure 2 The input capacitor Cin shown is used for filtering. The first filtering module may include the input capacitor Cin or the first filtering module may include the input capacitor Cin and the input resistor in series. Figure 2 (Not shown).

[0068] Optional, such as Figure 2 As shown, the second terminal of the seventh switch Q7 and the second terminal of the tenth switch Q10 can be connected through a second filter module (such as...). Figure 2 The output capacitor Co shown 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 3 (Not shown).

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

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

[0071] The upper limit value of the first voltage range is less than the upper limit value of the second voltage range, and the lower limit value of the first voltage range is less than the lower limit value of the second voltage range.

[0072] The control module 60 can control the first end of the first switching switch K1 and the third end of the first switching switch K1 to be in communication (i.e., the first switching switch K1 is closed), the first end of the second switching switch K2 and the third end of the second switching switch K2 to be in communication (i.e., the second switching switch K2 is closed), the first end of the third switching switch K3 and the third end of the third switching switch K3 to be in communication (i.e., the third switching switch K3 is closed) to make the primary side switching module 20 in the Y-type connection structure, control the first end of the fourth switching switch K4 and the third end of the fourth switching switch K4 to be in communication (i.e., the fourth switching switch K4 is closed), the first end of the fifth switching switch K5 and the third end of the fifth switching switch K5 to be in communication (i.e., the fifth switching switch K5 is closed), the first end of the sixth switching switch K6 and the third end of the sixth switching switch K6 to be in communication (i.e., the sixth switching switch K6 is closed) to make the secondary side switching module 40 in the Y-type connection structure. Please refer to Figure 3 , Figure 2 is a kind of based on Figure 3The 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. When the first switching switch K1, the second switching switch K2, the third switching switch K3, the fourth switching switch K4, the fifth switching switch K5, and the sixth switching switch K6 in the charging device 100 are all closed, the primary side switching module 20 is in a Y-type connection structure, and the secondary side switching module 40 is in a Y-type connection structure. At this time, when the charging device 100 works, 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. 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 tubes in the primary side bridge arm module 10 and the switch tubes in the secondary side 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. After isolation conversion through the first transformer T1, the second transformer T2, and the third transformer T3, the load (such as a power battery) is charged. The second end of the first switch tube Q1 and the second end of the fourth switch tube Q4 can be filtered by 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 by the output capacitor Co. Based on the circuit structure shown in FIG. 8, by changing the phase shift angle of the switch tubes in the primary side bridge arm module 10 and the switch tubes in the secondary side bridge arm module 50, the size of the output voltage Vout of the charging device 100 is changed, so that the output voltage of the charging device 100 is in a first voltage range. Figure 4

[0073] ​The control module 60 can control the first end of the first switch K1 and the second end of the first switch K1 to be in communication (i.e., the first switch K1 is turned off), the first end of the second switch K2 and the second end of the second switch K2 to be in communication (i.e., the second switch K2 is turned off), the first end of the third switch K3 and the second end of the third switch K3 to be in communication (i.e., the third switch K3 is turned off), so that the primary side switching module 20 is in a triangular connection structure, control the first end of the fourth switch K4 and the second end of the fourth switch K4 to be in communication (i.e., the fourth switch K4 is turned off), the first end of the fifth switch K5 and the second end of the fifth switch K5 to be in communication (i.e., the fifth switch K5 is turned off), the first end of the sixth switch K6 and the second end of the sixth switch K6 to be in communication (i.e., the sixth switch K6 is turned off), so that the secondary side switching module 40 is in a triangular connection structure. Please refer to Figure 4 , Figure 2 is provided in the application embodiment based on Figure 4The primary side switching module of the charging device is in a delta connection structure, and the secondary side switching module is in a delta connection structure. When the first switching switch K1, the second switching switch K2, the third switching switch K3, the fourth switching switch K4, the fifth switching switch K5, and the sixth switching switch K6 in the charging device 100 are all disconnected, the primary side switching module 20 is in a delta connection structure (△ connection), and the secondary side switching module 40 is in a delta connection structure (△ connection). At this time, when the charging device 100 works, 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 of the driving signal of the first switch tube Q1 and the driving signal of the fourth switch tube Q4 is complementary, the phase of the driving signal of the second switch tube Q2 and the driving signal of the fifth switch tube Q5 is complementary, the phase of the driving signal of the third switch tube Q3 and the driving signal of the sixth switch tube Q6 is complementary, the phase of the driving signal of the seventh switch tube Q7 and the driving signal of the tenth switch tube Q10 is complementary, the phase of the driving signal of the eighth switch tube Q8 and the driving signal of the eleventh switch tube Q11 is complementary, and the phase of 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 tubes in the primary side bridge arm module 10 and the switch tubes in the secondary side bridge arm module 50, the effective high level duty cycle of the first inductor Lr1, the effective high level duty cycle of the second inductor Lr2, and the effective high level duty cycle of the third inductor Lr3 are changed, and the load (such as a power battery) is charged through the isolation conversion of the first transformer T1, the second transformer T2, and the third transformer T3. The second end of the first switch tube Q1 and the second end of the fourth switch tube Q4 can be filtered by 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 by the output capacitor Co. Based on the circuit structure shown in FIG. 8, by changing the phase shift angle of the switch tubes in the primary side bridge arm module 10 and the switch tubes in the secondary side bridge arm module 50, the size of the output voltage of the charging device 100 is changed, so that the output voltage of the charging device 100 is in the second voltage range. Figure 5

[0074] The effective high level duty cycle of the first inductor Lr1 refers to the voltage difference between the two ends of the first inductor Lr1. In the case of the same input voltage of the charging device 100, the greater the voltage difference between the two ends of the first inductor Lr1, the smaller the output voltage of the charging device 100, and the smaller the voltage difference between the two ends of the first inductor Lr1, the greater the output voltage of the charging device 100.

[0075] ​Please refer to Figure 5 , Figure 5 is a schematic diagram of an equivalent circuit provided by an embodiment of the present application. As shown in Figure 3 , V AB is 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 Figure 4 or Figure 3 , V CD is 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 Figure 4 or Figure 5 . Figure 6 is the equivalent circuit diagram of the voltage relationship between V AB and V CD . V AB and V CD may be square wave signals. L is the inductance between points A and B. The larger L is, the larger the voltage across L is. When V AB is constant, the larger L is, the smaller V CD is. The input voltage Vin of the charging device 100 is positively correlated with V AB , and the output voltage Vout of the charging device 100 is positively correlated with V CD . In the case that 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 signals of each switch tube are the same, the output voltage Vout of the charging device 100 is negatively correlated with the size of L. When the primary side switching module 20 is in the Y-type connection structure, and the secondary side switching module 40 is in the Y-type connection structure, L is the sum of the inductances of the first inductor Lr1 and the second inductor Lr2; when the primary side switching module 20 is in the triangular connection structure, and the secondary side switching module 40 is in the triangular connection structure, L is the inductance of the first inductor Lr1. It can be seen that, in the case that other conditions are the same, the output voltage Vout of the charging device 100 is relatively small when the primary side switching module 20 is in the Y-type connection structure and the secondary side switching module 40 is in the Y-type connection structure, and the output voltage Vout of the charging device 100 is relatively large when the primary side switching module 20 is in the triangular connection structure and the secondary side switching module 40 is in the triangular connection structure.

[0076] Please refer to Figure 6 , Figure 3 is a schematic diagram of the circuit simulation result based on the circuit structure of Figure 6 provided by an embodiment of the present application. Figure 7The simulation parameters for the circuit are as follows: 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 capacitance 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 magnetizing inductance of the first transformer T1, the second transformer T2, and the third transformer T3 is 2 millihenries (mH), the frequency of the drive signal for each switch is 50 kilohertz (KHz), the phase shift angle between the primary and secondary sides (the conduction time difference between the switch of the primary side bridge arm module 10 and the switch of the secondary side bridge arm module 50) is 0.0813, and the output voltage Vout is approximately 701V.

[0077] Please see Figure 7 , Figure 4 This application provides a method based on... Figure 7 A schematic diagram of the circuit simulation results for the circuit structure. Figure 6 The simulation parameters for the circuit are as follows: 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 capacitance 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 magnetizing inductance of the first transformer T1, the second transformer T2, and the third transformer T3 is 2 millihenries (mH), the frequency of the drive signal for each switch is 50 kilohertz (KHz), the phase shift angle between the primary and secondary sides (the conduction time difference between the switch of the primary side bridge arm module 10 and the switch of the secondary side bridge arm module 50) is 0.0813, and the output voltage Vout is approximately 2258V.

[0078] from Figure 7 and Figure 4 It can be seen that, all other things being equal, Figure 3 The output voltage of the circuit structure is greater than Figure 3 The output voltage of the circuit structure. Figure 4 The circuit structure is suitable for low output voltage applications. Figure 8 The circuit structure is suitable for high output voltage applications. Therefore, by changing the connection structure of the primary-side switching module 20 and the secondary-side switching module 40, the output voltage range of the charging device 100 can be altered, thereby widening the output voltage range of the charging device 100 and meeting the voltage requirements of more scenarios.

[0079] Please see Figure 8 , Figure 8 This is a schematic diagram of the structure of an electric vehicle provided in an embodiment of this application.Figure 8 As shown, the electric vehicle can include the charging device 100 and a battery 200. The battery 200 can be a power battery on the vehicle.

[0080] ​ The specific structure and working principle of the charging device 100 in the above embodiment can refer to the above embodiment, and will not be described here.

[0081] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can refer to the related description of other embodiments.

[0082] In several embodiments provided in the present application, it should be understood that the disclosed charging device and electric vehicle can be implemented by other ways. For example, the charging device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, 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 by, The primary side bridge arm module, the primary side switching module, the transformer module, the secondary side switching module, the secondary side bridge arm module and the control module are included. The first output end of the primary side bridge arm module is connected with the first end of the primary side switching module, the second output end of the primary side bridge arm module is connected with the second end of the primary side switching module, the third output end of the primary side bridge arm module is connected with the third end of the primary side switching module, the fourth end of the primary side switching module is connected with the primary side first end of the first transformer, the fifth end of the primary side switching module is connected with the primary side second end of the first transformer, the sixth end of the primary side switching module is connected with the primary side first end of the second transformer, the seventh end of the primary side switching module is connected with the primary side second end of the second transformer, the eighth end of the primary side switching module is connected with the primary side first end of the third transformer, the ninth end of the primary side switching module is connected with the primary side second end of the third transformer, the first end of the secondary side switching module is connected with the first end of the first transformer, the second end of the secondary side switching module is connected with the second end of the first transformer, the third end of the secondary side switching module is connected with the first end of the second transformer, the fourth end of the secondary side switching module is connected with the second end of the second transformer, the fifth end of the secondary side switching module is connected with the first end of the third transformer, the sixth end of the secondary side switching module is connected with the second end of the third transformer, the seventh end of the secondary side switching module is connected with the first input end of the secondary side bridge arm module, the eighth end of the secondary side switching module is connected with the second input end of the secondary side bridge arm module, and the ninth end of the secondary side switching module is connected with the third input end of the secondary side bridge arm module. The control module is used for controlling 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 the input voltage of the input end of the primary side bridge arm module is inputted, so that the primary side switching module and the secondary side switching module are in different connection structures, and the range of the output voltage of the output end of the secondary side bridge arm module is different when the primary side switching module and the secondary side switching module are in different connection structures. The primary side switching module includes a first inductor, a second inductor, a third inductor, a first capacitor, a second capacitor, a third capacitor, a first switching switch, a second switching switch and a third switching switch; a first end of the first capacitor is connected to a first output end of the primary side bridge arm module, a second end of the first capacitor is connected to a first end of the first inductor and a second end of the third switching switch, a first end of the second capacitor is connected to a second output end of the primary side bridge arm module, a second end of the second capacitor is connected to a first end of the second inductor and a second end of the first switching switch, a first end of the third capacitor is connected to a third output end of the primary side bridge arm module, a second end of the third capacitor is connected to a first end of the third inductor and a second end of the second switching switch, a second end of the first inductor is connected to a first end of a primary side of the first transformer, a second end of the primary side of the first transformer is connected to a first end of the first switching switch, a third end of the first switching switch is connected to a third end of the second switching switch and a third end of the third switching switch, a second end of the second inductor is connected to a first end of a primary side of the second transformer, a second end of the primary side of the second transformer is connected to a first end of the second switching switch, a second end of the third inductor is connected to a first end of a primary side of the third transformer, a second end of the primary side of the third transformer is connected to a first end of the third switching switch; 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; a first end of a secondary side of the first transformer is connected to a first end of the fourth capacitor and a second end of the sixth switching switch, a second end of the fourth capacitor is connected to a first input end of the secondary side bridge arm module, a second end of the secondary side of the first transformer is connected to a first end of the fourth switching switch, a second end of the fourth switching switch is connected to a first end of a secondary side of the second transformer and a first end of the fifth capacitor, a second end of the fifth capacitor is connected to a second input end of the secondary side bridge arm module, a third end of the fourth switching switch is connected to a third end of the fifth switching switch and a third end of the sixth switching switch; a second end of the secondary side of the second transformer is connected to a first end of the fifth switching switch, a second end of the fifth switching switch is connected to a first end of a secondary side of the third transformer and a first end of the sixth capacitor, a second end of the sixth capacitor is connected to a third input end of the secondary side bridge arm module, a second end of the secondary side of the third transformer is connected to a first end of the sixth switching switch; The control module is used for controlling switching states of the switching switches in the primary side switching module and the switching switches in the secondary side switching module under the condition that an input voltage of the primary side bridge arm module is input, so that the primary side switching module and the secondary side switching module are in different connection structures, including: The control module is configured to control the first end of the first switch and the third end of the first switch to be in communication, the first end of the second switch and the third end of the second switch to be in communication, and the first end of the third switch and the third end of the third switch to be in communication, so that the primary side switching module is in a Y-shaped connection structure. The control module is further configured to control the first end of the first switch and the second end of the first switch to be in communication, the first end of the second switch and the second end of the second switch to be in communication, and the first end of the third switch and the second end of the third switch to be in communication, so that the primary side switching module is in a triangular connection structure. The control module is further configured to control the first end of the fourth switch and the third end of the fourth switch to be in communication, the first end of the fifth switch and the third end of the fifth switch to be in communication, and the first end of the sixth switch and the third end of the sixth switch to be in communication, so that the secondary side switching module is in a Y-shaped connection structure. The control module is further configured to control the first end of the fourth switch and the second end of the fourth switch to be in communication, the first end of the fifth switch and the second end of the fifth switch to be in communication, and the first end of the sixth switch and the second end of the sixth switch to be in communication, so that the secondary side switching module is in a triangular connection structure.

2. The charging device of claim 1, wherein when the primary side switching module is in the Y-shaped connection structure and the secondary side switching module is in the Y-shaped connection structure, an output voltage range of the charging device is a first voltage range; when the primary side switching module is in the triangular connection structure and the secondary side switching module is in the triangular connection structure, an output voltage range of the charging device is a second voltage range; wherein an upper limit value of the first voltage range is less than an upper limit value of the second voltage range, and a lower limit value of the first voltage range is less than a lower limit value of the second voltage range.

3. The charging device of claim 1, wherein, The primary side bridge arm module comprises 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 side 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 side 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 side 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.

4. The charging device of claim 3, wherein, The secondary side bridge arm module comprises 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 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, 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.

5. The charging device of claim 4, wherein, 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 of the driving signal of the first switch tube and the driving signal of the fourth switch tube is complementary, the phase of the driving signal of the second switch tube and the driving signal of the fifth switch tube is complementary, the phase of the driving signal of the third switch tube and the driving signal of the sixth switch tube is complementary, the phase of the driving signal of the seventh switch tube and the driving signal of the tenth switch tube is complementary, the phase of the driving signal of the eighth switch tube and the driving signal of the eleventh switch tube is complementary, the phase of the driving signal of the ninth switch tube and the driving signal of the twelfth switch tube is complementary.

6. The charging device of claim 5, wherein, The charging device further comprises 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, and the second filter module is connected between the second end of the seventh switch tube and the second end of the tenth switch tube.

7. An electric vehicle, characterized by The battery comprises the charging device and the battery as claimed in any one of claims 1-6.

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