Charging device and electric equipment

Abstract

The embodiment of the invention provides a charging device and electric equipment. The charging device comprises a switch module, a bridge arm module, an inductance module and a control module, when the charging device works in a boost mode, the control module controls the on-off state of the switch module, so that the bridge arm module and the inductance module form a boost circuit; when the charging device works in a step-down mode, the control module controls the on-off state of the switch module, so that the bridge arm module and the inductor module form a step-down circuit. And direct-current power supplies with different voltages can be compatible to charge the battery.

Description

Technical Field

[0001] The present application relates to the field of charging technology, and in particular to a charging device and an electric equipment. Background Art

[0002] As the number of new energy vehicles increases, the voltage range of power batteries of different models is getting wider and wider, and the power required for charging is also uneven. In addition, there are differences in the output capacity of charging piles from different manufacturers, resulting in some high-voltage models being unable to charge at charging piles with low output voltages, some low-voltage models being unable to charge at charging piles with high output voltages, or charging piles with high output voltages being unable to output at maximum power. At present, most manufacturers use direct charging, which is not compatible with charging piles of different voltages. Summary of the invention

[0003] The embodiments of the present application provide a charging device and an electric device, which can be compatible with DC power supplies of different voltages to charge a battery.

[0004] A first aspect of an embodiment of the present application provides a charging device, including a switch module, a bridge arm module, an inductor module and a control module, wherein the charging device is used to charge a battery;

[0005] The first end of the bridge arm module is suitable for connecting to the positive electrode of the battery, the second end of the bridge arm module is suitable for connecting to the negative electrode of the battery, the first end of the inductor module is suitable for connecting to a DC power supply through the switch module, and the midpoint of the bridge arm of the bridge arm module is connected to the second end of the inductor module; the second end of the bridge arm module is suitable for connecting to a DC power supply;

[0006] When the charging device operates in a boost mode, the control module controls the switch state of the switch module so that the bridge arm module and the inductor module form a boost circuit;

[0007] When the charging device operates in a buck mode, the control module controls the switch state of the switch module so that the bridge arm module and the inductor module form a buck circuit.

[0008] Optionally, the switch module includes a first switch and a second switch, the positive electrode of the battery is suitable for connecting to the first end of the first switch, the second end of the first switch is connected to the first end of the bridge arm module, the negative electrode of the battery is suitable for connecting to the first end of the second switch, and the second end of the second switch is connected to the second end of the bridge arm module.

[0009] Optionally, the switch module also includes: a third switch, a fourth switch, and a fifth switch, wherein the first end of the first switch is connected to the first end of the third switch, the second end of the first switch is connected to the first end of the fifth switch, the second end of the fifth switch is suitable for connecting the positive pole of the DC power supply and the first end of the fourth switch, the second end of the third switch is connected to the second end of the fourth switch, the second end of the fourth switch is suitable for being connected to the first end of the inductor module, and the negative pole of the DC power supply is suitable for being connected to the second end of the bridge arm module.

[0010] Optionally, the charging device further includes a first capacitor, the second end of the first switch is connected to the first end of the first capacitor, and the second end of the second switch is connected to the second end of the first capacitor.

[0011] Optionally, the bridge arm module includes N bridge arm units in parallel, each bridge arm unit includes an upper bridge switch tube and a lower bridge switch tube connected in series; the inductor module includes N inductors; the first ends of the N inductors are connected to the second ends of the fourth switch, and the second ends of the N inductors are connected one-to-one with the bridge arm midpoints of the N bridge arm units, the bridge arm midpoint of each bridge arm unit is the connection point of the upper bridge switch tube and the lower bridge switch tube of each bridge arm unit, and N is an integer greater than or equal to 1.

[0012] Optionally, the switch module further includes: a sixth switch and a seventh switch;

[0013] The negative electrode of the DC power supply is suitable for connecting to the first end of the sixth switch, and the second end of the sixth switch is connected to the second end of the second switch;

[0014] The second end of the fourth switch is connected to the first end of the seventh switch, and the second end of the seventh switch is connected to the first end of the inductor module.

[0015] Optionally, the charging device further includes a second capacitor, a first end of the second capacitor is connected to the second end of the fourth switch, and a second end of the second capacitor is connected to the second end of the sixth switch.

[0016] Optionally, the control module controls the switch state of the switch module so that the bridge arm module and the inductor module form a boost circuit, including:

[0017] The control module controls the fourth switch, the sixth switch and the seventh switch to be closed, the third switch and the fifth switch to be opened, at least one lower bridge switch tube of the bridge arm module to be turned on, and the N upper bridge switch tubes of the bridge arm module to be opened in the first stage, so that the DC power supply charges the inductor module;

[0018] In the second stage, the control module controls the fourth switch, the sixth switch and the seventh switch to be closed, the third switch and the fifth switch to be opened, at least one upper bridge switch tube of the bridge arm module to be turned on, and the N lower bridge switch tubes of the bridge arm module to be opened, so that the DC power supply and the inductor module charge the battery.

[0019] Optionally, the control module controls the switch state of the switch module so that the bridge arm module and the inductor module form a step-down circuit, including:

[0020] The control module controls the second switch, the third switch, the fifth switch, the sixth switch and the seventh switch to be closed in the first stage, the first switch and the fourth switch to be opened, at least one upper bridge switch tube of the bridge arm module to be turned on, and the N lower bridge switch tubes of the bridge arm module to be opened, so that the DC power supply charges the inductor module and the battery;

[0021] In the second stage, the control module controls the first switch, the second switch, the second switch, the third switch and the seventh switch to be closed, the first switch and the fourth switch to be opened, at least one lower bridge switch tube of the bridge arm module to be turned on, and the N upper bridge switch tubes of the bridge arm module to be opened, so that the inductor module charges the battery.

[0022] Optionally, when the charging device operates in a direct charging mode, the control module controls the switching state of the switch module so that the DC power supply charges the battery.

[0023] Optionally, when the charging device operates in a direct charging mode, the control module controls the switch state of the switch module so that the DC power supply charges the battery, including:

[0024] The control module controls the first switch, the second switch, the fifth switch and the sixth switch to be closed, and the third switch, the fourth switch and the seventh switch to be opened, so that the DC power supply charges the battery.

[0025] Optionally, when the charging device operates in a pre-charging mode, the control module controls the switching state of the switch module so that the bridge arm module and the inductor module form a pre-charging circuit.

[0026] Optionally, when the charging device operates in a pre-charging mode, the control module controls the switching state of the switch module so that the bridge arm module and the inductor module form a pre-charging circuit, including:

[0027] The control module controls the fourth switch, the sixth switch and the seventh switch to be closed, the first switch, the second switch, the third switch and the fifth switch to be opened in the first stage, at least one lower bridge switch tube of the bridge arm module to be turned on, and the N upper bridge switch tubes of the bridge arm module to be opened, so that the DC power supply charges the inductor module;

[0028] In the second stage, the control module controls the fourth switch, the sixth switch and the seventh switch to be closed, the first switch, the second switch, the third switch and the fifth switch to be opened, at least one upper bridge switch tube of the bridge arm module to be turned on, and the N lower bridge switch tubes of the bridge arm module to be opened, so that the DC power supply and the inductor module charge the first capacitor.

[0029] Optionally, the DC power supply includes: a DC charging pile or DC / DC.

[0030] A second aspect of the embodiments of the present application provides an electric device, comprising the charging device described in any one of the first aspects of the embodiments of the present application.

[0031] The charging device of the embodiment of the present application includes a switch module, a bridge arm module, an inductance module and a control module. The charging device is used to charge the battery. The first end of the bridge arm module is suitable for connecting to the positive electrode of the battery, the second end of the bridge arm module is suitable for connecting to the negative electrode of the battery, the first end of the inductance module is suitable for connecting to the DC power supply through the switch module, and the midpoint of the bridge arm of the bridge arm module is connected to the second end of the inductance module; the second end of the bridge arm module is suitable for connecting to the DC power supply; when the charging device works in the boost mode, the control module controls the switch state of the switch module so that the bridge arm module and the inductance module form a boost circuit; when the charging device works in the buck mode, the control module controls the switch state of the switch module so that the bridge arm module and the inductance module form a buck circuit. In the embodiment of the present application, the control module controls the switch state of the switch module so that the bridge arm module and the inductance module form a boost circuit or a buck circuit, so that the charging device works in the boost mode or the buck mode, and then realizes the DC power supply boosting or bucking to charge the battery. That is, the charging device of the embodiment of the present application can be compatible with DC power supplies of different voltages to charge the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 1 is a structural schematic diagram of a charging device provided in an embodiment of the present application;

[0034] Figure 2 is a schematic diagram of the structure of another charging device provided in an embodiment of the present application;

[0035] Figure 3 It is a schematic diagram of current flow in the first stage when a charging device provided by an embodiment of the present application works in a boost mode;

[0036] Figure 4 It is a schematic diagram of current flow in the second stage when a charging device provided by an embodiment of the present application works in a boost mode;

[0037] Figure 5 It is a schematic diagram of current flow in the first stage when a charging device provided by an embodiment of the present application works in a buck mode;

[0038] Figure 6 It is a schematic diagram of current flow in the second stage when a charging device provided by an embodiment of the present application works in a buck mode;

[0039] Figure 7 It is a schematic diagram of current flow when a charging device provided in an embodiment of the present application works in a direct charging mode;

[0040] Figure 8 It is a schematic diagram of current flow in the first stage when a charging device provided by an embodiment of the present application works in a pre-charging mode;

[0041] Fig. 9 It is a schematic diagram of current flow in the second stage when a charging device provided by an embodiment of the present application works in a pre-charging mode;

[0042] Fig.10 It is a structural schematic diagram of an electric device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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 includes a switch module, a bridge arm module 20, an inductor module 30 and a control module 40, and the charging device is used to charge the battery 10;

[0047] The first end of the bridge arm module 20 is suitable for connecting to the positive electrode of the battery 10, the second end of the bridge arm module 20 is suitable for connecting to the negative electrode of the battery 10, the first end of the inductor module 30 is suitable for connecting to a DC power supply through the switch module, and the midpoint of the bridge arm of the bridge arm module 20 is connected to the second end of the inductor module 30; the second end of the bridge arm module 20 is suitable for connecting to a DC power supply;

[0048] When the charging device operates in a boost mode, the control module 40 controls the switch state of the switch module so that the bridge arm module 20 and the inductor module 30 form a boost circuit;

[0049] When the charging device operates in the buck mode, the control module 40 controls the switch state of the switch module so that the bridge arm module 20 and the inductor module 30 form a buck circuit.

[0050] The battery 10 in the embodiment of the present application may be a power battery on an electric device. The charging device in the embodiment of the present application is a device for charging the battery 10. The electric device may be a device driven by electric energy. For example, the electric device may include any one of a vehicle, an aircraft, a ship, and an energy storage cabinet.

[0051] The switch module may include at least one switch.

[0052] The bridge arm module 20 may include at least one bridge arm midpoint. The bridge arm module 20 may include at least one bridge arm unit, each bridge arm unit having a bridge arm midpoint. Each bridge arm unit may include two switch tubes, and the connection point of the two switch tubes is the bridge arm midpoint of the bridge arm unit.

[0053] The inductor module 30 may include at least one inductor, one end of which is connected to a DC power supply through a switch module, and the other end of which is connected to a bridge arm midpoint of the bridge arm module 20, wherein each inductor in the at least one inductor is connected to a different bridge arm midpoint.

[0054] The number of bridge arm units in the bridge arm module 20 can be designed as required.

[0055] In a possible embodiment, the bridge arm module 20 may reuse the bridge arm module in the motor controller, and the inductance module 30 may reuse the inductance in the motor.

[0056] Optional, such as Figure 1 As shown, the switch module includes a first switch K1 and a second switch K2, the positive electrode of the battery 10 is suitable for connecting to the first end of the first switch K1, the second end of the first switch K1 is connected to the first end of the bridge arm module 20, the negative electrode of the battery 10 is suitable for connecting to the first end of the second switch K2, and the second end of the second switch K2 is connected to the second end of the bridge arm module 20.

[0057] In the embodiment of the present application, the bridge arm module 20 is connected to the battery 10 via a first switch K1 and a second switch K2, wherein the first switch K1 and the second switch K2 may be contactors or relays.

[0058] Optional, such as Figure 1 As shown, the switch module also includes: a third switch K3, a fourth switch K4, and a fifth switch K5, the first end of the first switch K1 is connected to the first end of the third switch K3, the second end of the first switch K1 is connected to the first end of the fifth switch K5, the second end of the fifth switch K5 is suitable for connecting the positive electrode of the DC power supply and the first end of the fourth switch K4, the second end of the third switch K3 is connected to the second end of the fourth switch K4, the second end of the fourth switch K4 is suitable for connecting to the first end of the inductor module 30, and the negative electrode of the DC power supply is suitable for connecting to the second end of the bridge arm module 20.

[0059] The third switch K3 , the fourth switch K4 , and the fifth switch K5 may be contactors or relays.

[0060] Optionally, the charging device further includes a first capacitor C1, the second end of the first switch K1 is connected to the first end of the first capacitor C1, and the second end of the second switch K2 is connected to the second end of the first capacitor C1.

[0061] The first capacitor C1 may be a pre-charge capacitor. The DC power supply may pre-charge the first capacitor C1 before charging the battery 10, thereby avoiding a large current generated during the charging process of the battery 10 due to the first capacitor C1 not being fully charged. The first capacitor C1 may be used to stabilize the voltage across the battery 10. When the DC power supply charges the battery 10, the ripple generated during the step-up or step-down process may be reduced.

[0062] Optionally, the bridge arm module 20 includes N bridge arm units in parallel, each bridge arm unit includes an upper bridge switch tube and a lower bridge switch tube connected in series; the inductor module 30 includes N inductors; the first ends of the N inductors are connected to the second end of the fourth switch K4, and the second ends of the N inductors are connected one-to-one with the bridge arm midpoints of the N bridge arm units, the bridge arm midpoint of each bridge arm unit is the connection point of the upper bridge switch tube and the lower bridge switch tube of each bridge arm unit, and N is an integer greater than or equal to 1.

[0063] The first end of the upper bridge switch is connected to the second end of the first switch K1, the second end of the upper bridge switch is connected to the first end of the corresponding lower bridge switch, and the second end of the lower bridge switch is connected to the second end of the second switch K2. The connection point between the second end of the upper bridge switch and the first end of the corresponding lower bridge switch is the midpoint of the bridge arm.

[0064] The upper bridge switch tube and the lower bridge switch tube can be any one of an insulated gate bipolar transistor (IGBT) and a metal oxide semiconductor field effect transistor (MOSFET).

[0065] Figure 1 In the description, N=3 is taken as an example.

[0066] The control module 40 can be used to control the closing or opening of the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, and the fifth switch K5, and control the state of the switch tube in the bridge arm module 20, so as to control the charging device to operate in the boost mode, the buck mode, or the direct charging mode.

[0067] The DC power supply is a device that provides DC power. For example, the DC power supply may be a DC charging station.

[0068] Optionally, the DC power supply includes: a DC charging pile or DC / DC, etc.

[0069] In the embodiment of the present application, a direct current / direct current converter (DC / DC) can convert direct current of one voltage into direct current of another voltage. For example, when the DC / DC converts high-voltage direct current into low-voltage direct current, the DC / DC can be the input end of the DC / DC. Exemplarily, the input end of the DC / DC can be connected to the battery 10.

[0070] Optional, based on Figure 1 The charging device of the present invention comprises: the control module 40 controls the switch state of the switch module so that the bridge arm module 20 and the inductor module 30 form a boost circuit, including:

[0071] In the first stage, the control module 40 controls the fourth switch K4 to be closed, the third switch K3 and the fifth switch K5 to be opened, at least one lower bridge switch tube of the bridge arm module 20 to be turned on, and the N upper bridge switch tubes of the bridge arm module 20 to be turned off, so that the DC power supply charges the inductor module 30;

[0072] In the second stage, the control module 40 controls the first switch K1, the second switch K2, and the fourth switch K4 to be closed, the third switch K3 and the fifth switch K5 to be opened, at least one upper bridge switch tube of the bridge arm module 20 to be turned on, and the N lower bridge switch tubes of the bridge arm module 20 to be opened, so that the DC power supply and the inductor module 30 charge the battery 10. The charging voltage of the battery 10 is equal to the sum of the voltage of the DC power supply and the voltage of the inductor module 30.

[0073] In the embodiment of the present application, in the first stage and the second stage, the first switch K1 and the second switch K2 can be closed or opened, which is not limited in the embodiment of the present application. When the charging device works in the boost mode, in the first stage, the control module 40 can control the fourth switch K4 to be closed, the third switch K3 and the fifth switch K5 to be opened, at least one lower bridge switch tube of the bridge arm module 20 to be turned on, and the N upper bridge switch tubes of the bridge arm module 20 to be opened. At this time, the DC power supply charges the inductor connected in series with the at least one lower bridge switch tube to increase the voltage at both ends of the inductor. In the second stage, the control module 40 can control the first switch K1, the second switch K2, and the fourth switch K4 to be closed, the third switch K3 and the fifth switch K5 to be turned off, at least one upper bridge switch tube of the bridge arm module 20 to be turned on, and the N lower bridge switch tubes of the bridge arm module 20 to be turned off. At this time, due to the freewheeling effect of the inductor connected in series with the at least one upper bridge switch tube (the inductor connected in series with the at least one upper bridge switch tube, that is, the inductor connected in series with the at least one lower bridge switch tube), the DC power supply and the inductor connected in series with the at least one upper bridge switch tube jointly charge the battery 10. Since the voltage across the battery 10 is equal to the sum of the voltage of the DC power supply and the voltage of the inductor connected in series with the at least one upper bridge switch tube, the DC power supply is boosted to charge the battery 10. In the embodiment of the present application, in the boost mode, the DC power supply does not charge the battery 10 directly, but charges the battery 10 through the inductor, and a large charging current will not appear suddenly. Even if the first switch K1, the second switch K2, the fourth switch K4 or any of the positive and negative switches of the charging pile is sintered, there will be no short circuit risk, thereby improving the safety of boost charging.

[0074] The first stage and the second stage are performed alternately, so that the DC power supply is boosted and then charged to the battery 10. Each switch can be turned off and on periodically, and each cycle can include the first stage and the second stage. The duration of the first stage and the second stage can be different, and the duration of the first stage and the second stage can be designed by the parameters of the inductor, the output voltage of the DC power supply, and the voltage of the battery 10.

[0075] It should be noted that, in the first stage, when the inductor connected in series to the at least one lower bridge switch tube is charged, the inductor cannot be in a saturated state. If the inductor is in a saturated state, the voltage across the inductor will not rise, and the voltage boosting effect cannot be achieved.

[0076] Optional, based on Figure 1 The control module 40 controls the switch state of the switch module so that the bridge arm module 20 and the inductor module 30 form a step-down circuit, including:

[0077] In the first stage, the control module 40 controls the second switch K2, the third switch K3 and the fifth switch K5 to be closed, the first switch K1 and the fourth switch K4 to be opened, at least one upper bridge switch tube of the bridge arm module 20 to be turned on, and the N lower bridge switch tubes of the bridge arm module 20 to be turned off, so that the DC power supply charges the inductor module 30 and the battery 10;

[0078] In the second stage, the control module 40 controls the second switch K2 and the third switch K3 to be closed, the first switch K1 and the fourth switch K4 to be opened, at least one lower bridge switch tube of the bridge arm module 20 to be turned on, and the N upper bridge switch tubes of the bridge arm module 20 to be opened, so that the inductor module 30 charges the battery 10.

[0079] In the embodiment of the present application, when the charging device operates in the buck mode, in the first stage, the control module 40 can control the second switch K2, the third switch K3 and the fifth switch K5 to be closed, the first switch K1 and the fourth switch K4 to be disconnected, at least one upper bridge switch tube of the bridge arm module 20 to be turned on, and the N lower bridge switch tubes of the bridge arm module 20 to be disconnected. At this time, the DC power supply charges the inductor and the battery 10 connected in series with the at least one upper bridge switch tube. At this time, the output voltage of the DC power supply is divided on the inductor and the battery 10 connected in series with the at least one upper bridge switch tube, and the voltage on the battery 10 is less than the output voltage of the DC power supply, thereby realizing buck charging. In the second stage, the control module 40 can control the second switch K2, the third switch K3 and the fifth switch K5 to be closed, the first switch K1 and the fourth switch K4 to be disconnected, at least one lower bridge switch tube of the bridge arm module 20 to be turned on, and the N upper bridge switch tubes of the bridge arm module 20 to be disconnected. At this time, due to the freewheeling effect of the inductor connected in series with the at least one lower bridge switch tube (the inductor connected in series with the at least one lower bridge switch tube, that is, the inductor connected in series with the at least one upper bridge switch tube), the inductor connected in series with the at least one lower bridge switch tube charges the battery 10, thereby realizing the charging of the battery 10 after the DC power supply is stepped down. In the embodiment of the present application, in the step-down mode, the DC power supply does not charge the battery 10 directly, but charges the battery 10 through the inductor, and a large charging current will not appear suddenly. Even if the second switch K2, the third switch K3, the fifth switch K5 or a switch in the positive and negative switches of the charging pile is sintered, there will be no risk of short circuit, thereby improving the safety of step-down charging. In the buck mode, the DC power supply can output a voltage greater than the battery 10 , so that the DC power supply can output as much power as possible, thereby increasing the charging current of the battery 10 and further reducing the charging time of the battery 10 .

[0080] The first stage and the second stage are performed alternately, so that the DC power supply is stepped down to charge the battery 10. Each switch can be turned off and on periodically, and each cycle can include the first stage and the second stage. The duration of the first stage and the second stage can be different, and the duration of the first stage and the second stage can be designed by the parameters of the inductor, the output voltage of the DC power supply, and the voltage of the battery 10.

[0081] It should be noted that, in the first stage, when the inductor connected in series to the at least one upper bridge switch tube is charged, the inductor cannot be in a saturated state. If the inductor is in a saturated state, the voltage across the inductor will not rise, and the voltage reduction effect cannot be achieved.

[0082] Optionally, when the charging device operates in a direct charging mode, the control module 40 controls the switching state of the switch module so that the DC power supply charges the battery 10 .

[0083] In the embodiment of the present application, when the voltage of the DC power supply is close to the voltage of the battery 10, the charging device can be operated in the direct charging mode. For example, when the output voltage of the DC power supply is greater than the voltage of the battery 10, and the difference between the output voltage of the DC power supply and the voltage of the battery 10 is less than a set threshold (for example, 20V), the charging device can be operated in the direct charging mode.

[0084] Before charging the battery 10, the charging device can be operated in a pre-charging mode to charge the first capacitor C1 (pre-charging capacitor) first, thereby avoiding a large current generated during the charging process of the battery 10 due to the first capacitor C1 not being fully charged.

[0085] Optional, based on Figure 1 The charging device, wherein the control module 40 controls the switch state of the switch module so that the DC power supply charges the battery 10, includes: the control module 40 controls the first switch K1, the second switch K2, and the fifth switch K5 to be closed, and the third switch K3 and the fourth switch K4 to be opened, so that the DC power supply charges the battery 10.

[0086] In the embodiment of the present application, the control module 40 controls the first switch K1, the second switch K2, and the fifth switch K5 to be closed, and the third switch K3 and the fourth switch K4 to be disconnected. The charging device operates in a direct charging mode. At this time, the DC power supply can directly charge the battery 10 without passing through the bridge arm module 20 and the inductor module 30, thereby improving the energy conversion efficiency.

[0087] Optionally, when the charging device operates in the pre-charging mode, the control module 40 controls the switching state of the switch module so that the bridge arm module 20 and the inductor module 30 form a pre-charging circuit.

[0088] In the embodiment of the present application, before charging the battery 10, the charging device can be operated in a pre-charging mode to charge the first capacitor C1 (pre-charging capacitor) first, thereby avoiding a large current generated during the charging process of the battery 10 due to the first capacitor C1 not being fully charged.

[0089] Optional, based on Figure 1 The charging device of the present invention comprises: the control module 40 controls the switch state of the switch module so that the bridge arm module 20 and the inductor module 30 form a pre-charging circuit, including:

[0090] In the first stage, the control module 40 controls the fourth switch K4 to be closed, the first switch K1, the second switch K2, the third switch K3 and the fifth switch K5 to be opened, at least one lower bridge switch tube of the bridge arm module 20 to be turned on, and the N upper bridge switch tubes of the bridge arm module 20 to be turned off, so that the DC power supply charges the inductor module 30;

[0091] In the second stage, the control module 40 controls the fourth switch K4 to be closed, the first switch K1, the second switch K2, the third switch K3 and the fifth switch K5 to be opened, at least one upper bridge switch tube of the bridge arm module 20 to be turned on, and the N lower bridge switch tubes of the bridge arm module 20 to be opened, so that the DC power supply and the inductor module 30 charge the first capacitor C1. The charging voltage of the first capacitor C1 is equal to the sum of the voltage of the DC power supply and the voltage of the inductor module 30.

[0092] In an embodiment of the present application, when the charging device operates in the pre-charging mode, in the first stage, the control module 40 can control the fourth switch K4 to close, the first switch K1, the second switch K2, the third switch K3 and the fifth switch K5 are all disconnected, at least one lower bridge switch tube of the bridge arm module 20 is turned on, and the N upper bridge switch tubes of the bridge arm module 20 are all disconnected. At this time, the DC power supply charges the inductor connected in series with the at least one lower bridge switch tube to increase the voltage across the inductor. In the second stage, the control module 40 can control the fourth switch K4 to be closed, the first switch K1, the second switch K2, the third switch K3 and the fifth switch K5 to be disconnected, at least one upper bridge switch tube of the bridge arm module 20 to be turned on, and the N lower bridge switch tubes of the bridge arm module 20 to be disconnected. At this time, due to the freewheeling effect of the inductor connected in series with the at least one upper bridge switch tube (the inductor connected in series with the at least one upper bridge switch tube, that is, the inductor connected in series with the at least one lower bridge switch tube), the DC power supply and the inductor connected in series with the at least one upper bridge switch tube jointly charge the first capacitor C1, thereby realizing the pre-charging of the first capacitor C1 by the DC power supply.

[0093] The durations of the first stage and the second stage may be different, and the durations of the first stage and the second stage may be designed by parameters of the inductor, the output voltage of the DC power supply, and parameters of the first capacitor C1.

[0094] It should be noted that, when the inductor connected in series to the at least one lower bridge switch tube is charged in the first stage, the inductor cannot be in a saturated state.

[0095] In the embodiment of the present application, when the first capacitor C1 is pre-charged, the DC power supply and the inductor connected in series with the at least one upper bridge switch tube jointly charge the first capacitor C1, and due to the freewheeling effect of the inductor, a large charging current will not appear suddenly, which can avoid the generation of large current during the pre-charging process and improve the safety of pre-charging.

[0096] In the embodiment of the present application, when the voltage of the DC power supply is less than the voltage of the battery 10, the control module 40 controls the bridge arm module 20 and the inductor module 30 to form a boost circuit, so that the charging device works in a boost mode, thereby realizing that the DC power supply is boosted and then charges the battery 10; when the voltage of the DC power supply is greater than the voltage of the battery 10, the control module 40 controls the bridge arm module 20 and the inductor module 30 to form a buck circuit, so that the charging device works in a buck mode, thereby realizing that the DC power supply is bucked and then charges the battery 10. DC power supplies with different voltages can be compatible to charge the battery 10.

[0097] See also Figure 2 , Figure 2 It is a schematic diagram of the structure of another charging device provided in an embodiment of the present application. Figure 2 is Figure 1 Based on Figure 2 As shown, in Figure 1 On the basis of, the switch module further includes: a sixth switch K6 and a seventh switch K7.

[0098] The negative electrode of the DC power supply is suitable for being connected to the second end of the second switch K2 through the sixth switch K6. Specifically, the negative electrode of the DC power supply is connected to the first end of the sixth switch K6, and the second end of the sixth switch K6 is connected to the second end of the second switch K2;

[0099] The second end of the fourth switch K4 is connected to the first end of the inductor module 30 . Specifically, the second end of the fourth switch K4 is connected to the first end of the seventh switch K7 , and the second end of the seventh switch K7 is connected to the first end of the inductor module 30 .

[0100] Adding the seventh switch K7 can reduce the risk of electric shock. When the vehicle is driving or parking, if the battery 10 is working, the first end of the seventh switch K7 (charging port) may be charged. If the first end of the seventh switch K7 is accidentally touched, electric shock may occur, resulting in the risk of electric shock.

[0101] Optionally, the charging device further includes a second capacitor C2, a first end of the second capacitor C2 is connected to the second end of the fourth switch K4, and a second end of the second capacitor C2 is connected to the second end of the sixth switch K6.

[0102] In the embodiment of the present application, the second capacitor C2 can further reduce the ripple generated during the voltage boost or voltage drop process when the DC power supply charges the battery 10.

[0103] In the following embodiments, a DC power supply is described by taking a DC charging pile as an example.

[0104] Optional, based on Figure 2 The charging device of the present invention comprises: the control module controls the bridge arm module and the inductor module to form a boost circuit, comprising:

[0105] In the first stage, the control module controls the fourth switch K4, the sixth switch K6 and the seventh switch K7 to be closed, the third switch K3 and the fifth switch K5 to be opened, at least one lower bridge switch tube of the bridge arm module to be turned on, and the N upper bridge switch tubes of the bridge arm module to be opened, so that the DC charging pile charges the inductor module;

[0106] In the second stage, the control module controls the first switch K1, the second switch K2, the fourth switch K4, the sixth switch K6 and the seventh switch K7 to be closed, the third switch K3 and the fifth switch K5 to be opened, at least one upper bridge switch tube of the bridge arm module to be turned on, and the N lower bridge switch tubes of the bridge arm module to be opened, so that the DC charging pile and the inductor module charge the battery 10, and the charging voltage of the battery 10 is equal to the sum of the voltage of the DC charging pile and the voltage of the inductor module.

[0107] In the embodiment of the present application, in the first stage and the second stage, the first switch K1 and the second switch K2 can be closed or opened, which is not limited in the embodiment of the present application. When the charging device works in the boost mode, in the first stage, please refer to Figure 3 , Figure 3 1 is a schematic diagram of the current flow direction in the first stage when a charging device provided in an embodiment of the present application works in a boost mode. Figure 3 As shown, the control module can control the fourth switch K4, the sixth switch K6 and the seventh switch K7 to be closed, the third switch K3 and the fifth switch K5 to be opened, at least one lower bridge switch tube of the bridge arm module to be turned on, and the N upper bridge switch tubes of the bridge arm module to be turned off. At this time, the DC charging pile charges the inductor connected in series with the at least one lower bridge switch tube to increase the voltage at both ends of the inductor. In the second stage, please refer to Figure 4 , Figure 4 1 is a schematic diagram of the current flow direction in the second stage when a charging device provided in an embodiment of the present application works in a boost mode. Figure 4As shown, the control module can control the first switch K1, the second switch K2, the fourth switch K4, the sixth switch K6 and the seventh switch K7 to be closed, the third switch K3 and the fifth switch K5 to be disconnected, at least one upper bridge switch tube of the bridge arm module to be turned on, and the N lower bridge switch tubes of the bridge arm module to be disconnected. At this time, due to the freewheeling effect of the inductor connected in series with the at least one upper bridge switch tube (the inductor connected in series with the at least one upper bridge switch tube, that is, the inductor connected in series with the at least one lower bridge switch tube), the DC charging pile and the inductor connected in series with the at least one upper bridge switch tube jointly charge the battery 10. Since the voltage across the battery 10 is equal to the sum of the voltage of the DC charging pile and the voltage of the inductor connected in series with the at least one upper bridge switch tube, the DC charging pile is boosted to charge the battery 10. In the embodiment of the present application, in the boost mode, the DC charging pile does not charge the battery 10 directly, but charges the battery 10 through the inductor, and a large charging current will not appear suddenly. Even if the second switch K2, the third switch K3, the fifth switch K5 or any of the positive and negative switches of the charging pile is sintered, there will be no short circuit risk, thereby improving the safety of boost charging.

[0108] The first stage and the second stage are performed alternately, so that the DC charging pile is boosted and then charged to the battery 10. Each switch can be turned off and closed periodically, and each cycle can include the first stage and the second stage. The duration of the first stage and the second stage can be different, and the duration of the first stage and the second stage can be designed by the parameters of the inductor, the output voltage of the DC charging pile and the voltage of the battery 10.

[0109] It should be noted that, in the first stage, when the inductor connected in series to the at least one lower bridge switch tube is charged, the inductor cannot be in a saturated state. If the inductor is in a saturated state, the voltage across the inductor will not rise, and the voltage boosting effect cannot be achieved.

[0110] Optional, based on Figure 2 The charging device of the present invention comprises: the control module controls the bridge arm module and the inductor module to form a step-down circuit, comprising:

[0111] In the first stage, the control module controls the second switch K2, the third switch K3, the fifth switch K5, the sixth switch K6 and the seventh switch K7 to be closed, the first switch K1 and the fourth switch K4 to be opened, at least one upper bridge switch tube of the bridge arm module to be turned on, and the N lower bridge switch tubes of the bridge arm module to be opened, so that the DC charging pile charges the inductor module and the battery 10;

[0112] In the second stage, the control module controls the second switch K2, the third switch K3, the fifth switch K5, the sixth switch K6 and the seventh switch K7 to be closed, the first switch K1 and the fourth switch K4 to be opened, at least one lower bridge switch tube of the bridge arm module to be turned on, and the N upper bridge switch tubes of the bridge arm module to be opened, so that the inductor module charges the battery 10.

[0113] In the embodiment of the present application, when the charging device operates in the step-down mode, in the first stage, refer to Figure 5 , Figure 5 1 is a schematic diagram of the current flow direction in the first stage when a charging device provided in an embodiment of the present application works in a buck mode. Figure 5 As shown, the control module can control the second switch K2, the third switch K3, the fifth switch K5, the sixth switch K6 and the seventh switch K7 to be closed, the first switch K1 and the fourth switch K4 to be opened, at least one upper bridge switch tube of the bridge arm module to be turned on, and the N lower bridge switch tubes of the bridge arm module to be opened. At this time, the DC charging pile charges the inductor and the battery 10 connected in series with the at least one upper bridge switch tube. At this time, the output voltage of the DC charging pile is divided on the inductor and the battery 10 connected in series with the at least one upper bridge switch tube, and the voltage on the battery 10 is less than the output voltage of the DC charging pile, thereby realizing step-down charging. In the second stage, please refer to Figure 6 , Figure 6 1 is a schematic diagram of the current flow direction in the second stage when a charging device provided in an embodiment of the present application works in a buck mode. Figure 6As shown, the control module can control the second switch K2, the third switch K3 and the seventh switch K7 to be closed, the first switch K1 and the fourth switch K4 to be disconnected, at least one lower bridge switch tube of the bridge arm module to be turned on, and the N upper bridge switch tubes of the bridge arm module to be disconnected. At this time, due to the freewheeling effect of the inductor connected in series with the at least one lower bridge switch tube (the inductor connected in series with the at least one lower bridge switch tube, that is, the inductor connected in series with the at least one upper bridge switch tube), the inductor connected in series with the at least one lower bridge switch tube charges the battery 10, thereby realizing the DC charging pile to charge the battery 10 after the voltage is reduced. In the second stage, the fifth switch K5 and the current switch can be opened or closed, which is not limited in the embodiment of the present application. In the embodiment of the present application, in the buck mode, the DC charging pile does not charge the battery 10 directly, and the DC charging pile charges the battery 10 through the inductor, and a large charging current will not appear suddenly. Even if the second switch K2, the third switch K3, the fifth switch K5 or a switch in the charging positive and negative switches of the charging pile is sintered, there will be no short circuit risk, thereby improving the safety of buck charging. In the buck mode, the DC charging pile can output a voltage greater than that of the battery 10 , so that the DC charging pile can output as much power as possible, thereby increasing the charging current of the battery 10 and further reducing the charging time of the battery 10 .

[0114] The first stage and the second stage are performed alternately, so that the DC charging pile can charge the battery 10 after the voltage is reduced. Each switch can be turned off and on periodically, and each cycle can include the first stage and the second stage. The duration of the first stage and the second stage can be different, and the duration of the first stage and the second stage can be designed by the parameters of the inductor, the output voltage of the DC charging pile, and the voltage of the battery 10.

[0115] It should be noted that, in the first stage, when the inductor connected in series to the at least one upper bridge switch tube is charged, the inductor cannot be in a saturated state. If the inductor is in a saturated state, the voltage across the inductor will not rise, and the voltage reduction effect cannot be achieved.

[0116] Optional, based on Figure 2 A charging device, when the charging device works in a direct charging mode, the control module controls the switch state of the switch module so that the DC power supply charges the battery, including: the control module controls the first switch K1, the second switch K2, the fifth switch K5 and the sixth switch K6 to be closed, and the third switch K3, the fourth switch K4 and the seventh switch K7 to be opened, so that the DC charging pile charges the battery 10.

[0117] In the present application, please refer to Figure 7 , Figure 7Schematic diagram of current flow when a charging device provided in an embodiment of the present application works in a direct charging mode. Figure 7 As shown, the control module controls the first switch K1, the second switch K2, the fifth switch K5 and the sixth switch K6 to be closed, and the third switch K3, the fourth switch K4 and the seventh switch K7 are all disconnected, and the charging device operates in a direct charging mode. At this time, the DC charging pile can directly charge the battery 10 without passing through the bridge arm module and the inductor module, which can improve the energy conversion efficiency. When the voltage of the DC charging pile is close to the voltage of the battery 10, the charging device can be operated in a direct charging mode. Exemplarily, when the output voltage of the DC charging pile is greater than the voltage of the battery 10, and the difference between the output voltage of the DC charging pile and the voltage of the battery 10 is less than a set threshold (for example, 20V), the charging device can be operated in a direct charging mode.

[0118] Optional, based on Figure 2 A charging device, wherein when the charging device operates in a pre-charging mode, the control module controls the switching state of the switch module so that the bridge arm module and the inductor module form a pre-charging circuit, comprising:

[0119] In the first stage, the control module controls the fourth switch K4, the sixth switch K6 and the seventh switch K7 to be closed, the first switch K1, the second switch K2, the third switch K3 and the fifth switch K5 to be opened, at least one lower bridge switch tube of the bridge arm module to be turned on, and the N upper bridge switch tubes of the bridge arm module to be turned off, so that the DC charging pile charges the inductor module;

[0120] In the second stage, the control module controls the fourth switch K4, the sixth switch K6 and the seventh switch K7 to be closed, the first switch K1, the second switch K2, the third switch K3 and the fifth switch K5 to be opened, at least one upper bridge switch tube of the bridge arm module is turned on, and the N lower bridge switch tubes of the bridge arm module are all opened, so that the DC charging pile and the inductor module charge the first capacitor C1.

[0121] In the embodiment of the present application, when the charging device operates in the pre-charging mode, in the first stage, refer to Figure 8 , Figure 8 1 is a schematic diagram of the current flow direction in the first stage when a charging device provided in an embodiment of the present application works in a pre-charging mode. Figure 8As shown, the control module can control the fourth switch K4, the sixth switch K6 and the seventh switch K7 to be closed, the first switch K1, the second switch K2, the third switch K3 and the fifth switch K5 to be opened, at least one lower bridge switch tube of the bridge arm module is turned on, and the N upper bridge switch tubes of the bridge arm module are all turned off. At this time, the DC charging pile charges the inductor connected in series with the at least one lower bridge switch tube to increase the voltage at both ends of the inductor. In the second stage, please refer to Fig. 9 , Fig. 9 1 is a schematic diagram of the current flow direction in the second stage when a charging device provided in an embodiment of the present application works in a pre-charging mode. Fig. 9 As shown, the control module can control the fourth switch K4, the sixth switch K6 and the seventh switch K7 to be closed, the first switch K1, the second switch K2, the third switch K3 and the fifth switch K5 to be disconnected, at least one upper bridge switch tube of the bridge arm module to be turned on, and the N lower bridge switch tubes of the bridge arm module to be disconnected. At this time, due to the freewheeling effect of the inductor connected in series with the at least one upper bridge switch tube (the inductor connected in series with the at least one upper bridge switch tube, that is, the inductor connected in series with the at least one lower bridge switch tube), the DC charging pile and the inductor connected in series with the at least one upper bridge switch tube jointly charge the first capacitor C1, thereby realizing the pre-charging of the first capacitor C1 by the DC charging pile.

[0122] The duration of the first stage and the second stage may be different, and the duration of the first stage and the second stage may be designed by the parameters of the inductor, the output voltage of the DC charging pile and the parameters of the first capacitor C1.

[0123] It should be noted that, when the inductor connected in series to the at least one lower bridge switch tube is charged in the first stage, the inductor cannot be in a saturated state.

[0124] In the embodiment of the present application, when the first capacitor C1 is pre-charged, the DC charging pile and the inductor connected in series with the at least one upper bridge switch tube jointly charge the first capacitor C1, and due to the freewheeling effect of the inductor, a large charging current will not appear suddenly, which can avoid the generation of large current during the pre-charging process and improve the safety of pre-charging.

[0125] Figures 3 to 9 In the example, the inductor module uses three inductors. In the boost module, buck mode, and pre-charge mode, the charging module can conduct only one of the three inductors or conduct them simultaneously. This is not limited in the embodiment of the present application.

[0126] When only one of the three inductors is turned on, a staggered conduction method can be used. For example, the three inductors include: inductor L1, inductor L2, and inductor L3. In the current cycle, inductor L1 is turned on, in the next cycle, inductor L2 is turned on, and in the next cycle, inductor L3 is turned on. When inductor L1, inductor L2, and inductor L3 are periodically staggered, the ripple of the inductor can be reduced.

[0127] In the embodiment of the present application, for the case where the output voltage of the DC charging pile is low, by working in the boost mode, the function of compatible charging with the low-voltage charging pile is realized; on the other hand, for the charging pile with high output voltage, by working in the buck mode, the DC charging pile is made to output as much power as possible within the range that meets the charging of low-voltage vehicles or the whole vehicle can bear, thereby reducing the charging time. Through the boost mode and the buck mode, the compatibility and convenience of electric vehicle charging are improved. The boost and buck circuits of the embodiment of the present application are both involved in inductance and switch tubes, which can effectively avoid the risk of short circuit between the vehicle and the charging pile when charging. In the direct charging mode, the first capacitor can be pre-charged first to prevent the risk of short circuit between the vehicle and the charging pile. The seventh switch is in a closed state in both the boost mode and the buck mode. Adding the seventh switch can distinguish between driving and charging conditions. When driving or in similar working conditions, the seventh switch is disconnected to avoid the charging port being charged when the electric control is working. If the staff accidentally touches the charging port or the corresponding position without knowing it, it will cause the risk of electric shock. When the seventh switch is closed during charging, since the charging gun is already plugged in during charging, there is no risk of electric shock as mentioned above.

[0128] The embodiment of the present application may also provide an electric device, which may include Figures 1 to 9 Any charging device. Fig.10 , Fig.10 Schematic diagram of the structure of an electric device provided in an embodiment of the present application. Fig.10 As shown, the electric device includes Figure 2 The charging device shown. The DC power source charges the battery 10 through the charging device. The electric device can be a device driven by electric energy. For example, the electric device can include any one of a vehicle, an aircraft, a ship, and an energy storage cabinet.

[0129] 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.

[0130] In the several embodiments provided in this application, it should be understood that the disclosed vehicle-mounted charging device can be implemented in other ways. For example, the above-described vehicle-mounted charging device embodiments are only schematic, and for example, 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 switch module, a bridge arm module, an inductor module and a control module, and the charging device is used to charge the battery; The first end of the bridge arm module is suitable for connecting to the positive electrode of the battery, the second end of the bridge arm module is suitable for connecting to the negative electrode of the battery, the first end of the inductor module is suitable for connecting to a DC power supply through the switch module, and the midpoint of the bridge arm of the bridge arm module is connected to the second end of the inductor module; the second end of the bridge arm module is suitable for connecting to a DC power supply; When the charging device operates in a boost mode, the control module controls the switch state of the switch module so that the bridge arm module and the inductor module form a boost circuit; When the charging device operates in a buck mode, the control module controls the switch state of the switch module so that the bridge arm module and the inductor module form a buck circuit.

2. The charging device according to claim 1, characterized in that: The switch module includes a first switch and a second switch, the positive electrode of the battery is suitable for connecting to the first end of the first switch, the second end of the first switch is connected to the first end of the bridge arm module, the negative electrode of the battery is suitable for connecting to the first end of the second switch, and the second end of the second switch is connected to the second end of the bridge arm module.

3. The charging device according to claim 2, characterized in that: The switch module also includes: a third switch, a fourth switch, and a fifth switch, wherein the first end of the first switch is connected to the first end of the third switch, the second end of the first switch is connected to the first end of the fifth switch, the second end of the fifth switch is suitable for connecting the positive electrode of a DC power supply and the first end of the fourth switch, the second end of the third switch is connected to the second end of the fourth switch, the second end of the fourth switch is suitable for connecting to the first end of the inductor module, and the negative electrode of the DC power supply is suitable for connecting to the second end of the bridge arm module.

4. The charging device according to claim 3, characterized in that: The charging device further includes a first capacitor, the second end of the first switch is connected to the first end of the first capacitor, and the second end of the second switch is connected to the second end of the first capacitor.

5. The charging device according to claim 3 or 4, characterized in that: The bridge arm module includes N bridge arm units connected in parallel, each bridge arm unit includes an upper bridge switch tube and a lower bridge switch tube connected in series; the inductor module includes N inductors; the first ends of the N inductors are connected to the second ends of the fourth switch, and the second ends of the N inductors are connected one-to-one with the bridge arm midpoints of the N bridge arm units, the bridge arm midpoint of each bridge arm unit is the connection point of the upper bridge switch tube and the lower bridge switch tube of each bridge arm unit, and N is an integer greater than or equal to 1.

6. The charging device according to claim 5, characterized in that: The switch module further includes: a sixth switch and a seventh switch; The negative electrode of the DC power supply is suitable for connecting to the first end of the sixth switch, and the second end of the sixth switch is connected to the second end of the second switch; The second end of the fourth switch is connected to the first end of the seventh switch, and the second end of the seventh switch is connected to the first end of the inductor module.

7. The charging device according to claim 6, characterized in that: The charging device further includes a second capacitor, a first end of the second capacitor is connected to the second end of the fourth switch, and a second end of the second capacitor is connected to the second end of the sixth switch.

8. The charging device according to claim 6 or 7, characterized in that: The control module controls the switch state of the switch module so that the bridge arm module and the inductor module form a boost circuit, including: The control module controls the fourth switch, the sixth switch and the seventh switch to be closed, the third switch and the fifth switch to be opened, at least one lower bridge switch tube of the bridge arm module to be turned on, and the N upper bridge switch tubes of the bridge arm module to be opened in the first stage, so that the DC power supply charges the inductor module; In the second stage, the control module controls the first switch, the second switch, the fourth switch, the sixth switch and the seventh switch to be closed, the third switch and the fifth switch to be opened, at least one upper bridge switch tube of the bridge arm module to be turned on, and N lower bridge switch tubes of the bridge arm module to be opened, so that the DC power supply and the inductor module charge the battery.

9. The charging device according to claim 6 or 7, characterized in that: The control module controls the switch state of the switch module so that the bridge arm module and the inductor module form a step-down circuit, including: The control module controls the second switch, the third switch, the fifth switch, the sixth switch and the seventh switch to be closed in the first stage, the first switch and the fourth switch to be opened, at least one upper bridge switch tube of the bridge arm module to be turned on, and the N lower bridge switch tubes of the bridge arm module to be opened, so that the DC power supply charges the inductor module and the battery; In the second stage, the control module controls the second switch, the third switch and the seventh switch to be closed, the first switch and the fourth switch to be opened, at least one lower bridge switch tube of the bridge arm module to be turned on, and N upper bridge switch tubes of the bridge arm module to be opened, so that the inductor module charges the battery.

10. The charging device according to claim 1, characterized in that: When the charging device operates in the direct charging mode, the control module controls the switch state of the switch module so that the DC power supply charges the battery.

11. The charging device according to claim 6 or 7, characterized in that: When the charging device operates in the direct charging mode, the control module controls the switch state of the switch module so that the DC power supply charges the battery, including: The control module controls the first switch, the second switch, the fifth switch and the sixth switch to be closed, and the third switch, the fourth switch and the seventh switch to be opened, so that the DC power supply charges the battery.

12. The charging device according to claim 1, characterized in that: When the charging device operates in the pre-charging mode, the control module controls the switching state of the switch module so that the bridge arm module and the inductor module form a pre-charging circuit.

13. The charging device according to claim 6 or 7, characterized in that: When the charging device operates in the pre-charging mode, the control module controls the switching state of the switch module so that the bridge arm module and the inductor module form a pre-charging circuit, including: The control module controls the fourth switch, the sixth switch and the seventh switch to be closed, the first switch, the second switch, the third switch and the fifth switch to be opened in the first stage, at least one lower bridge switch tube of the bridge arm module to be turned on, and the N upper bridge switch tubes of the bridge arm module to be opened, so that the DC power supply charges the inductor module; In the second stage, the control module controls the fourth switch, the sixth switch and the seventh switch to be closed, the first switch, the second switch, the third switch and the fifth switch to be opened, at least one upper bridge switch tube of the bridge arm module to be turned on, and the N lower bridge switch tubes of the bridge arm module to be opened, so that the DC power supply and the inductor module charge the first capacitor.

14. The charging device according to any one of claims 1 to 13, characterized in that: The DC power supply includes: a DC charging pile.

15. The charging device according to claim 12 or 13, characterized in that: The DC power supply includes: a DC charging pile or a DC / DC.

16. An electric device, characterized in that: It comprises a charging device as claimed in any one of claims 1 to 15.

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