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 and a control module, the first end of the bridge arm module is suitable for being connected with the anode of the battery, and the second end of the bridge arm module is suitable for being connected with the cathode of the battery; the bridge arm midpoint of the bridge arm module is suitable for being connected with the positive electrode of the direct-current charging port, and the second end of the bridge arm module is connected with the negative electrode of the direct-current charging port through the switch module. Or the bridge arm midpoint of the bridge arm module is suitable for being connected with the negative electrode of the direct-current charging port, and the first end of the bridge arm module is connected with the positive electrode of the direct-current charging port through the switch module; and under the condition that the direct current charging condition is met, the control module controls the state of the switch module and the state of the bridge arm module, so that the charging device charges the battery. The manufacturing cost of the charging device can be reduced.

Description

TECHNICAL FIELD

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

[0002] With the development of new energy technology, most electric vehicles now have direct current charging function. The direct current charging circuit needs two contactors: a positive contactor of a direct current charging port and a negative contactor of the direct current charging port. The two contactors are monitored by a vehicle control device of the electric vehicle and the two contactors are controlled to be turned on and turned off. However, the use of two contactors in the direct current charging circuit leads to high vehicle manufacturing cost. SUMMARY

[0003] Embodiments of the present application provide a charging device and an electric equipment, which can reduce the cost of the charging device.

[0004] A first aspect of embodiments of the present application provides a charging device, comprising a switch module, a bridge arm module and a control module;

[0005] A first end of the bridge arm module is adapted to be connected with a positive electrode of the battery, and a second end of the bridge arm module is adapted to be connected with a negative electrode of the battery;

[0006] A bridge arm midpoint of the bridge arm module is adapted to be connected with a positive electrode of a direct current charging port, and the second end of the bridge arm module is connected with a negative electrode of the direct current charging port through the switch module; or the bridge arm midpoint of the bridge arm module is adapted to be connected with a negative electrode of the direct current charging port, and the first end of the bridge arm module is connected with a positive electrode of the direct current charging port through the switch module;

[0007] In the case of meeting the direct current charging condition, the control module controls the state of the switch module and the state of the bridge arm module, so as to charge the battery by the charging device.

[0008] Optionally, the charging device further comprises an inductor module, and a first end of the inductor module is connected with the bridge arm midpoint of the bridge arm module.

[0009] Optionally, a second end of the inductor module is connected with the positive electrode of the direct current charging port or the negative electrode of the direct current charging port.

[0010] Optionally, the bridge arm module comprises N bridge arm units connected in parallel, each bridge arm unit comprises an upper bridge switch tube and a lower bridge switch tube connected in series; the inductor module comprises N inductors; the first end of the N inductors is the first end of the inductor module, the second end of the N inductors is the second end of the inductor module, the bridge arm midpoint of each bridge arm unit is a point on a connection line 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.

[0011] Optionally, the first end of the N inductors is connected to the bridge arm midpoint of the N bridge arm units one by one.

[0012] Optionally, in the case that the bridge arm midpoint of the bridge arm module is adapted to be connected to the positive pole of the direct current charging port, the bridge arm midpoint of at least one bridge arm unit of the N bridge arm units is connected to the positive pole of the direct current charging port.

[0013] In the case that the bridge arm midpoint of the bridge arm module is adapted to be connected to the negative pole of the direct current charging port, the bridge arm midpoint of at least one bridge arm unit of the N bridge arm units is connected to the negative pole of the direct current charging port.

[0014] Optionally, the control module controls the state of the switch module and the state of the bridge arm module, including:

[0015] In the case that the bridge arm midpoint of the bridge arm module is adapted to be connected to the positive pole of the direct current charging port, the control module controls the switch module to be in the closed state, controls the upper bridge switch tube in the bridge arm module connected to the positive pole of the direct current charging port to be turned on, and controls the N lower bridge switch tubes in the bridge arm module to be all turned off.

[0016] In the case that the bridge arm midpoint of the bridge arm module is adapted to be connected to the negative pole of the direct current charging port, the control module controls the switch module to be in the closed state, controls the lower bridge switch tube in the bridge arm module connected to the negative pole of the direct current charging port to be turned on, and controls the N upper bridge switch tubes in the bridge arm module to be all turned off.

[0017] Optionally, the control module controls the state of the switch module and the state of the bridge arm module, including:

[0018] In the case that the bridge arm midpoint of the bridge arm module is adapted to be connected to the positive pole of the direct current charging port, the control module controls the N lower bridge switch tubes in the bridge arm module to be all turned off.

[0019] In the case that the bridge arm midpoint of the bridge arm module is adapted to be connected to the negative pole of the direct current charging port, the control module controls the N upper bridge switch tubes in the bridge arm module to be all turned off.

[0020] Optionally, the direct current charging condition includes that the indicator light of the vehicle does not display, the motor speed of the vehicle is less than a set threshold, and a direct current gun connection signal is detected.

[0021] Optionally, in the case that the charging port cover is opened and no gun connection signal is detected, the control module controls the switch tubes in the bridge arm module to be turned off.

[0022] In the case of detecting that the charging port cover is opened and there is an AC gun connection signal, the control module controls the switch tube in the bridge arm module to be turned off.

[0023] A second aspect of the embodiment of the application provides a power utilization device comprising the charging device of any one of the first aspect of the embodiment of the application.

[0024] The charging device of the embodiment of the application comprises a switch module, a bridge arm module and a control module; a first end of the bridge arm module is adapted to be connected with a positive electrode of a battery, a second end of the bridge arm module is adapted to be connected with a negative electrode of the battery; a bridge arm midpoint of the bridge arm module is adapted to be connected with a positive electrode of a DC charging port, the second end of the bridge arm module is connected with a negative electrode of the DC charging port through the switch module; or the bridge arm midpoint of the bridge arm module is adapted to be connected with a negative electrode of the DC charging port, the first end of the bridge arm module is connected with a positive electrode of the DC charging port through the switch module; in the case of meeting a DC charging condition, the control module controls a state of the switch module and a state of the bridge arm module, so as to charge the battery by the charging device. In the embodiment of the application, the first end of the bridge arm module is connected with the positive electrode of the battery, the second end of the bridge arm module is connected with the negative electrode of the battery, the bridge arm midpoint of the bridge arm module is connected with the positive electrode of the charging port, the second end of the bridge arm module is connected with the negative electrode of the DC charging port through the switch module, or the bridge arm midpoint of the bridge arm module is connected with the negative electrode of the charging port, and the first end of the bridge arm module is connected with the positive electrode of the DC charging port through the switch module, so as to charge the battery. The bridge arm module is used to replace a switch module, so that the cost of the charging device is reduced. BRIEF DESCRIPTION OF DRAWINGS

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

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

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

[0028] Figure 3 is a structural schematic diagram of another charging device provided by the embodiment of the application;

[0029] Figure 4a is a structural schematic diagram of another charging device provided by the embodiment of the application;

[0030] Figure 4b is a structural schematic diagram of another charging device provided by the embodiment of the application;

[0031] Figure 4c is a structural schematic diagram of another charging device provided by an embodiment of the present application;

[0032] Figure 4d is a structural schematic diagram of another charging device provided by an embodiment of the present application;

[0033] Figure 4e is a structural schematic diagram of another charging device provided by an embodiment of the present application;

[0034] Figure 4f is a structural schematic diagram of another charging device provided by an embodiment of the present application;

[0035] Figure 5 is a current flow direction schematic diagram of a charging device provided by an embodiment of the present application for charging a battery;

[0036] Figure 6 is a current flow direction schematic diagram of another charging device provided by an embodiment of the present application for charging a battery;

[0037] Figure 7 is a structural schematic diagram of another charging device provided by an embodiment of the present application;

[0038] Figure 8 is a structural schematic diagram of another charging device provided by an embodiment of the present application;

[0039] Figure 9 is a structural schematic diagram of another charging device provided by an embodiment of the present application;

[0040] Figure 10 is a structural schematic diagram of another charging device provided by an embodiment of the present application;

[0041] Figure 11 is a structural schematic diagram of another charging device provided by an embodiment of the present application;

[0042] Figure 12 is a current flow direction schematic diagram of a charging device provided by an embodiment of the present application for charging a battery;

[0043] Figure 13 is a current flow direction schematic diagram of another charging device provided by an embodiment of the present application for charging a battery;

[0044] Figure 14 is a structural schematic diagram of another charging device provided by an embodiment of the present application;

[0045] Figure 15 is a structural schematic diagram of another charging device provided by an embodiment of the present application;

[0046] Figure 16 This is a flowchart of a DC charging control method provided in an embodiment of this application;

[0047] Figure 17 This is a schematic diagram of the structure of an electrical device provided in an embodiment of this application. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, system, product, or apparatus that comprises a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, products, or apparatuses.

[0050] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0051] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a charging device provided in an embodiment of this application. Figure 1 As shown, the charging device includes a switch module S1, a bridge arm module 20, and a control module 30. The charging device is used to charge the battery 10.

[0052] The first end of the bridge arm module 20 is adapted to be connected to the positive terminal of the battery 10, the second end of the bridge arm module 20 is adapted to be connected to the negative terminal of the battery 10, and the midpoint of the bridge arm of the bridge arm module 20 is adapted to be connected to the positive terminal of the DC charging port; the second end of the bridge arm module 20 is connected to the negative terminal of the DC charging port through the switch module S1.

[0053] When the DC charging conditions are met, the control module 30 controls the switching state of the switch module S1 and the state of the bridge arm module 20 so that the charging device can charge the battery 10.

[0054] The charging circuit for charging the battery 10 is composed of the positive terminal of the DC charging port, the midpoint of the bridge arm module 20, the first end of the bridge arm module 20, the positive terminal of the battery 10, the negative terminal of the battery 10, the second end of the bridge arm module 20, and the negative terminal of the DC charging port.

[0055] In this embodiment, the battery 10 can be a power battery in an electrical device, or a battery pack, which can be composed of multiple individual lithium batteries connected in series. The charging device in this embodiment is a device for charging the battery 10. The electrical device can be a device driven by electrical energy. For example, the electrical device can include any of the following: a vehicle, an aircraft, a ship, or an energy storage cabinet. The charging device can be a DC charging device, enabling DC charging of the battery 10 via a DC charging interface.

[0056] The switch module S1 may include a contactor or a relay.

[0057] The first end of the bridge arm module 20 is adapted to be connected to the positive terminal of the battery 10, including either of the following two cases: 1. The first end of the bridge arm module 20 is connected to the positive terminal of the battery 10; 2. The first end of the bridge arm module 20 is connected to the positive terminal of the battery 10 through other devices.

[0058] The second end of the bridge arm module 20 is adapted to be connected to the negative terminal of the battery 10, including either of the following two cases: 1. The second end of the bridge arm module 20 is connected to the negative terminal of the battery 10; 2. The second end of the bridge arm module 20 is connected to the negative terminal of the battery 10 through other devices.

[0059] Figure 1 In the process, the first end of the bridge arm module 20 is connected to the positive terminal of the battery 10 through the second contactor S2, and the second end of the bridge arm module 20 is connected to the negative terminal of the battery 10 through the third contactor S3.

[0060] Optionally, the first end of the bridge arm module 20 and the second end of the bridge arm module 20 are connected by a first capacitor C1, which can ensure the stability of the voltage across the battery 10.

[0061] 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 one bridge arm midpoint. Each bridge arm unit may include two switching transistors, and a point on the connection line between the two switching transistors is the bridge arm midpoint of that bridge arm unit.

[0062] The number of bridge arm units in bridge arm module 20 can be designed as needed.

[0063] DC charging conditions are the conditions under which DC charging can be performed, such as: the DC charging station receiving a charging readiness signal and the charging station's voltage being within the normal range.

[0064] The control module 30 can be a motor control unit (MCU).

[0065] The DC charging port can be the DC charging port on the vehicle. When the DC charging gun on the DC charging pile is inserted into the DC charging port, the positive terminal of the DC charging port is connected to the positive terminal of the DC charging pile, and the negative terminal of the DC charging port is connected to the negative terminal of the DC charging pile.

[0066] In this embodiment, a switching module is used at the negative terminal of the DC charging port, while no switching module is needed at the positive terminal of the DC charging port, thereby saving a switching module and reducing the manufacturing cost of the charging device.

[0067] Optional, such as Figure 2 As shown, the charging device also includes an inductor module 40, the first end of which is connected to the midpoint of the bridge arm of the bridge arm module 20.

[0068] The inductor module 40 may include at least one inductor. A first end of the inductor is connected to a DC charging port, and a second end of the inductor is connected to the midpoint of a bridge arm of the bridge arm module 20. The midpoint of the bridge arm connected to each of the at least one inductor is different.

[0069] In one possible embodiment, the bridge arm module 20 can reuse the bridge arm module in the motor drive circuit, the inductor module 40 can reuse the inductor in the motor, and the control module 30 can reuse the motor controller MCU. When this charging device is applied to a vehicle, the existing bridge arm module in the motor drive circuit and the existing inductor in the motor can be reused, eliminating the need to add additional bridge arm modules and inductor modules to the charging device, thus further reducing the manufacturing cost of the charging device.

[0070] The midpoint of the bridge arm module 20 is adapted to be connected to the positive terminal of the DC charging port, including either of the following two cases: 1. The midpoint of the bridge arm module 20 is connected to the positive terminal of the DC charging port; 2. The midpoint of the bridge arm module 20 is connected to the positive terminal of the DC charging port through other devices.

[0071] like Figure 1 or Figure 2 As shown, the midpoint of the bridge arm module 20 is adapted to be connected to the positive terminal of the DC charging port, including: the midpoint of the bridge arm module 20 is connected to the positive terminal of the DC charging port.

[0072] like Figure 3 As shown, the midpoint of the bridge arm module 20 is adapted to be connected to the positive terminal of the DC charging port, including: the midpoint of the bridge arm module 20 is connected to the positive terminal of the DC charging port through the inductor module 40.

[0073] Figure 3 In the process, the first end of the inductor module 40 is connected to the midpoint of the bridge arm of the bridge arm module 20, and the second end of the inductor module 40 is connected to the positive terminal of the DC charging port.

[0074] Optionally, the bridge arm module 20 includes N bridge arm units connected in parallel, each bridge arm unit including an upper bridge switch and a lower bridge switch connected in series; the inductor module 40 includes N inductors; the first end of the N inductors is the first end of the inductor module, the second end of the N inductors is the second end of the inductor module, the midpoint of the bridge arm of each bridge arm unit is a point on the connection line between the upper bridge switch and the lower bridge switch of each bridge arm unit, and N is an integer greater than or equal to 1.

[0075] The upper bridge switch and the lower bridge switch can be either an insulated-gate bipolar transistor (IGBT) or a metal-oxide-semiconductor field-effect transistor (MOSFET).

[0076] Figure 1 , Figure 2 and Figure 3 In this example, the upper and lower bridge switching transistors are IGBTs. A point on the connection line between the positive terminal of the body diode of the upper bridge IGBT and the negative terminal of the body diode of the lower bridge IGBT is the midpoint of the bridge arm unit. The negative terminal of the body diode of the upper bridge IGBT is the first end of the bridge arm module 20, the negative terminal of the body diode of the lower bridge IGBT is the midpoint of the bridge arm unit, and the positive terminal of the body diode of the lower bridge IGBT is the second end of the bridge arm module 20.

[0077] Figure 1 , Figure 2 and Figure 3 In the example, N=3 is used for illustration, that is, the bridge arm module 20 includes 3 bridge arm units connected in parallel.

[0078] like Figure 2 or Figure 3 As shown, when the first end of the inductor module is connected to the midpoint of the bridge arm of the bridge arm module, the first ends of the N inductors are connected one-to-one with the midpoints of the bridge arms of the N bridge arm units.

[0079] Optionally, if the midpoint of the bridge arm of the bridge arm module is adapted to be connected to the positive terminal of the DC charging port, the midpoint of the bridge arm of at least one of the N bridge arm units is connected to the positive terminal of the DC charging port.

[0080] Figure 1 In the middle, the midpoint of the first bridge arm unit of the three bridge arm units is connected to the positive terminal of the DC charging port. Figure 4a In the middle, the midpoint of the second bridge arm unit of the three bridge arm units is connected to the positive terminal of the DC charging port. Figure 4b In the middle, the midpoint of the third bridge arm unit of the three bridge arm units is connected to the positive terminal of the DC charging port. Figure 4c In the middle, the midpoint of the first bridge arm unit and the midpoint of the second bridge arm unit are both connected to the positive terminal of the DC charging port. Figure 4d In the process, the midpoint of the first bridge arm unit and the midpoint of the third bridge arm unit are both connected to the positive terminal of the DC charging port. Figure 4e In the middle, the midpoint of the second bridge arm unit and the midpoint of the third bridge arm unit are both connected to the positive terminal of the DC charging port. Figure 4f In the process, the midpoints of the first, second, and third bridge arm units are all connected to the positive terminal of the DC charging port.

[0081] Figure 1 or Figure 2 In the N bridge arm units, the midpoint of one of the bridge arm units is connected to the positive terminal of the DC charging port.

[0082] Optionally, the control module controls the state of the switch module and the state of the bridge arm module, including:

[0083] When the midpoint of the bridge arm module is suitable for connection with the positive terminal of the DC charging port, the control module controls the switch module to be in a closed state, controls the upper bridge switch tube connected to the positive terminal of the DC charging port in the bridge arm module to be turned on, and controls all N lower bridge switches of the bridge arm module to be turned off.

[0084] Optionally, the control module controls the state of the switch module and the state of the bridge arm module, including:

[0085] The control module controls the switch module to be in the closed state and controls all N lower bridge switches of the bridge arm module to be disconnected.

[0086] Please see Figure 5 , Figure 5 This is a schematic diagram of the current flow when a charging device charges a battery, according to an embodiment of this application. Figure 5The direction of current flow is based on Figure 2 Charging devices. For example... Figure 5 As shown, the current flow for charging battery 10 by the charging device is as follows: positive terminal of DC charging port → upper bridge switch of bridge arm module 20 → positive terminal of battery 10 → negative terminal of battery 10 → switch module S1 → negative terminal of DC charging port.

[0087] Please see Figure 6 , Figure 6 This is a schematic diagram of the current flow when the charging device provided in this application is charging a battery. Figure 6 The direction of current flow is based on Figure 3 Charging devices. For example... Figure 6 As shown, the current flow for charging battery 10 is as follows: positive terminal of DC charging port → inductor module 40 → upper bridge switch of bridge arm module 20 → positive terminal of battery 10 → negative terminal of battery 10 → switch module S1 → negative terminal of DC charging port. It should be noted that... Figure 6 The current can flow through each upper bridge switch of the bridge arm module 20 (at this time, the control module controls each upper bridge switch of the bridge arm module 20 to be turned on). Figure 6 Only one possible flow direction of current through bridge arm module 20 is shown.

[0088] It should be noted that, Figure 5 or Figure 6 In this module, the control module can control the upper bridge switch of the bridge arm module 20 to be turned on or off. During DC charging, the positive voltage of the DC charging port will be greater than the positive voltage of the battery 10. Even when the upper bridge switch is off, the body diode of the upper bridge switch connected to the positive terminal of the DC charging port will still be turned on, which will not affect the charging device from charging the battery 10. Even if the upper bridge switch malfunctions, the charging device can still charge the battery 10.

[0089] Figure 7 and Figure 8 This is a schematic diagram of another charging device provided in an embodiment of this application. Figure 2 In the middle, the positive terminal of the DC charging port is connected to the midpoint of the bridge arm of one of the three bridge arm units (corresponding to one phase of the three-phase motor). Figure 7 and Figure 8 In the middle, the positive terminal of the DC charging port is connected to the midpoint of the bridge arm of the other two bridge arm units in the three bridge arm units respectively.

[0090] Please see Figure 9 , Figure 9 This is a schematic diagram of another charging device provided in an embodiment of this application. Figure 9 As shown, the charging device includes a switch module S1, a bridge arm module 20, and a control module 30. The charging device is used to charge the battery 10.

[0091] The first end of the bridge arm module 20 is adapted to be connected to the positive terminal of the battery 10, the second end of the bridge arm module 20 is adapted to be connected to the negative terminal of the battery 10, and the midpoint of the bridge arm of the bridge arm module 20 is adapted to be connected to the negative terminal of the DC charging port; the first end of the bridge arm module 20 is connected to the positive terminal of the DC charging port through the switch module S1.

[0092] When the DC charging conditions are met, the control module 30 controls the switching state of the switch module S1 and the state of the bridge arm module 20 so that the charging device can charge the battery 10.

[0093] In this embodiment, the battery 10 can be a power battery in an electrical device. The charging device in this embodiment is a device for charging the battery 10. The electrical device can be a device driven by electrical energy. For example, the electrical device can include any of the following: a vehicle, an aircraft, a ship, or an energy storage cabinet.

[0094] The switch module S1 may include a contactor or a relay.

[0095] The first end of the bridge arm module 20 is adapted to be connected to the positive terminal of the battery 10, including either of the following two cases: 1. The first end of the bridge arm module 20 is connected to the positive terminal of the battery 10; 2. The first end of the bridge arm module 20 is connected to the positive terminal of the battery 10 through other devices.

[0096] The second end of the bridge arm module 20 is adapted to be connected to the negative terminal of the battery 10, including either of the following two cases: 1. The second end of the bridge arm module 20 is connected to the negative terminal of the battery 10; 2. The second end of the bridge arm module 20 is connected to the negative terminal of the battery 10 through other devices.

[0097] Figure 9 In the process, the first end of the bridge arm module 20 is connected to the positive terminal of the battery 10 through the second contactor S2, and the second end of the bridge arm module 20 is connected to the negative terminal of the battery 10 through the third contactor S3.

[0098] 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 one bridge arm midpoint. Each bridge arm unit may include two switching transistors, the connection point of which is the bridge arm midpoint of that bridge arm unit.

[0099] The number of bridge arm units in bridge arm module 20 can be designed as needed.

[0100] DC charging conditions are the conditions under which DC charging can be performed, such as: the DC charging station receiving a charging readiness signal and the charging station's voltage being within the normal range.

[0101] The control module 30 can be a motor control unit (MCU).

[0102] The DC charging port can be the DC charging port on the vehicle. When the DC charging gun on the DC charging pile is inserted into the DC charging port, the positive terminal of the DC charging port is connected to the positive terminal of the DC charging pile, and the negative terminal of the DC charging port is connected to the negative terminal of the DC charging pile.

[0103] In this embodiment, a switching module is used at the positive terminal of the DC charging port, while no switching module is needed at the negative terminal of the DC charging port, thereby saving a switching module and reducing the manufacturing cost of the charging device.

[0104] Optional, such as Figure 10 As shown, the charging device also includes an inductor module 40, the first end of which is connected to the midpoint of the bridge arm of the bridge arm module 20.

[0105] The inductor module 40 may include at least one inductor. One end of the inductor is connected to a DC charging port via a switching module, and the other end of the inductor is connected to the midpoint of a bridge arm of the bridge arm module 20. The midpoint of the bridge arm connected to each of the at least one inductor is different.

[0106] In one possible embodiment, the bridge arm module 20 can reuse the bridge arm module in the motor drive circuit, the inductor module 40 can reuse the inductor in the motor, and the control module 30 can reuse the motor controller MCU.

[0107] The midpoint of the bridge arm module 20 is adapted to be connected to the negative terminal of the DC charging port, including either of the following two cases: 1. The midpoint of the bridge arm module 20 is connected to the negative terminal of the DC charging port; 2. The midpoint of the bridge arm module 20 is connected to the negative terminal of the DC charging port through other devices.

[0108] like Figure 9 or Figure 10 As shown, the midpoint of the bridge arm module 20 is adapted to be connected to the negative terminal of the DC charging port, including: the midpoint of the bridge arm module 20 is connected to the negative terminal of the DC charging port.

[0109] like Figure 11 As shown, the midpoint of the bridge arm module 20 is adapted to be connected to the negative terminal of the DC charging port, including: the midpoint of the bridge arm module 20 is connected to the negative terminal of the DC charging port through the inductor module 40.

[0110] Figure 11 In the process, the first end of the inductor module 40 is connected to the midpoint of the bridge arm of the bridge arm module 20, and the second end of the inductor module 40 is connected to the negative terminal of the DC charging port.

[0111] Optionally, the bridge arm module 20 includes N bridge arm units connected in parallel, each bridge arm unit including an upper bridge switch and a lower bridge switch connected in series; the inductor module 40 includes N inductors; the first end of the N inductors is the first end of the inductor module, the second end of the N inductors is the second end of the inductor module, the midpoint of the bridge arm of each bridge arm unit is a point on the connection line between the upper bridge switch and the lower bridge switch of each bridge arm unit, and N is an integer greater than or equal to 1.

[0112] The upper bridge switch and the lower bridge switch can be either an insulated-gate bipolar transistor (IGBT) or a metal-oxide-semiconductor field-effect transistor (MOSFET).

[0113] Figure 9 , Figure 10 and Figure 11 In this example, the upper and lower bridge switching transistors are IGBTs. A point on the connection line between the positive terminal of the body diode of the upper bridge IGBT and the negative terminal of the body diode of the lower bridge IGBT is the midpoint of the bridge arm unit. The negative terminal of the body diode of the upper bridge IGBT is the first end of the bridge arm module 20, the negative terminal of the body diode of the lower bridge IGBT is the midpoint of the bridge arm unit, and the positive terminal of the body diode of the lower bridge IGBT is the second end of the bridge arm module 20.

[0114] Figure 9 , Figure 10 and Figure 11 In the example, N=3 is used for illustration, that is, the bridge arm module 20 includes 3 bridge arm units connected in parallel.

[0115] like Figure 10 or Figure 11 As shown, when the first end of the inductor module is connected to the midpoint of the bridge arm of the bridge arm module, the first ends of the N inductors are connected one-to-one with the midpoints of the bridge arms of the N bridge arm units.

[0116] Optionally, if the midpoint of the bridge arm of the bridge arm module is adapted to be connected to the negative terminal of the DC charging port, the midpoint of the bridge arm of at least one of the N bridge arm units is connected to the negative terminal of the DC charging port.

[0117] Figure 9 or Figure 10 In the N bridge arm units, the midpoint of one of the bridge arm units is connected to the negative terminal of the DC charging port.

[0118] Optionally, the control module controls the state of the switch module and the state of the bridge arm module, including:

[0119] When the midpoint of the bridge arm module is suitable for connection with the negative terminal of the DC charging port, the control module controls the switch module to be in a closed state, controls the lower bridge switch tube connected to the negative terminal of the DC charging port in the bridge arm module to be turned on, and controls all N upper bridge switches of the bridge arm module to be turned off.

[0120] Optionally, the control module controls the state of the switch module and the state of the bridge arm module, including:

[0121] The control module controls the switch module to be in the closed state and controls all N upper bridge switches of the bridge arm module to be disconnected.

[0122] Please see Figure 12 , Figure 12 This is a schematic diagram of the current flow when a charging device charges a battery, according to an embodiment of this application. Figure 12 The direction of current flow is based on Figure 10 Charging devices. For example... Figure 12 As shown, the current flow for charging battery 10 by the charging device is as follows: positive terminal of DC charging port → switch module S1 → positive terminal of battery 10 → negative terminal of battery 10 → lower bridge switch of bridge arm module 20 → negative terminal of DC charging port.

[0123] Please see Figure 13 , Figure 13 This is a schematic diagram of the current flow when the charging device provided in this application is charging a battery. Figure 13 The direction of current flow is based on Figure 11 Charging devices. For example... Figure 13 As shown, the current flow for charging battery 10 is as follows: positive terminal of DC charging port → switching module S1 → positive terminal of battery 10 → negative terminal of battery 10 → lower bridge switch of bridge arm module 20 → inductor module 40 → negative terminal of DC charging port. It should be noted that... Figure 13 The current can flow through each lower bridge switch of the bridge arm module 20 (at this time, the control module controls each lower bridge switch of the bridge arm module 20 to be turned on). Figure 13 Only one possible flow direction of current through bridge arm module 20 is shown.

[0124] It should be noted that, Figure 12 or Figure 13In this module, the control module can control the lower bridge switch of the bridge arm module 20 to be turned on or off. During DC charging, the positive voltage of the DC charging port will be greater than the positive voltage of the battery 10. Even when the lower bridge switch is off, the body diode of the lower bridge switch connected to the negative terminal of the DC charging port will still be turned on, which will not affect the charging device from charging the battery 10. Even if the lower bridge switch malfunctions, the charging device can still charge the battery 10.

[0125] Figure 14 and Figure 15 This is a schematic diagram of another charging device provided in an embodiment of this application. Figure 10 In the middle, the positive terminal of the DC charging port is connected to the midpoint of the bridge arm of one of the three bridge arm units (corresponding to one phase of the three-phase motor). Figure 14 and Figure 15 In the middle, the positive terminal of the DC charging port is connected to the midpoint of the bridge arm of the other two bridge arm units in the three bridge arm units respectively.

[0126] Optionally, the DC charging conditions include: the vehicle's indicator lights are not displayed, the vehicle's motor speed is less than a set threshold, and a DC charging gun connection signal is detected.

[0127] Among them, the vehicle's indicator lights can be the OK light. The OK light is an indicator light for the normal start-up of new energy vehicles. When the OK light is not displayed, it indicates that the vehicle cannot be started and the vehicle is in a locked state.

[0128] A threshold can be preset; if the vehicle's motor speed is lower than the preset threshold, the vehicle cannot start. For example, the preset threshold could be 10 revolutions per minute.

[0129] A DC charging gun connection signal was detected, indicating that the DC charging gun of the DC charging pile has been inserted into the DC charging port and the DC charging gun and the DC charging port have been successfully connected, and the conditions for DC charging are met.

[0130] The necessary conditions for DC charging are that the vehicle cannot start and the DC charging gun and DC charging port are successfully connected.

[0131] Optionally, if the charging port cover is detected to be open and there is no gun connection signal, the control module controls the switching transistors in the bridge arm module to be disconnected (for example, the control module can control all the switching transistors in the bridge arm module to be disconnected).

[0132] When the charging port cover is detected to be open and an AC gun connection signal is detected, the control module controls the switching transistors in the bridge arm module to disconnect (for example, the control module can control all switching transistors in the bridge arm module to disconnect).

[0133] In this embodiment, to ensure safety, it is necessary to prevent the switching transistor in the bridge arm module from conducting when the charging port cover is open and the charging gun is not inserted. If the switching transistor in the bridge arm module conducts when the charging port cover is open and the charging gun is not inserted, current will flow through the positive terminal of battery 10 and through the switching transistor in the bridge arm module to the DC charging port, resulting in voltage at the DC charging port. Touching the DC charging port poses a risk of electric shock. When the charging port cover is detected to be open and there is no charging gun connection signal, the control module controls the switching transistor in the bridge arm module to disconnect; when the charging port cover is detected to be open and there is an AC charging gun connection signal, the control module controls the switching transistor in the bridge arm module to disconnect, thus reducing the risk of electric shock.

[0134] based on Figures 1 to 15 The orientation of the body diode of the switching transistor in the bridge arm module 20 is such that when all the switching transistors in the bridge arm module are off, the battery 10 will not flow to the DC charging port through the switch in the bridge arm module 20, thereby avoiding the risk of electric shock when a person touches the DC charging port.

[0135] Please see Figure 16 , Figure 16 This is a flowchart of a DC charging control method provided in an embodiment of this application. Figure 16 The method shown can be based on Figure 2 The charging device shown. Figure 2 The control module uses a motor controller MCU as an example. Figure 2 The switching transistors in the bridge arm module are exemplified by IGBTs. Figure 16 As shown, the method may include the following steps.

[0136] 1601, MCU wake-up.

[0137] 1602, the MCU has driving capabilities.

[0138] 1603. Does the DC charging condition meet? If yes, proceed to step 1604; otherwise, proceed to step 1602.

[0139] 1604. Has the MCU received the IGBT turn-on command from the vehicle controller? If yes, proceed to step 1605; otherwise, proceed to step 1603.

[0140] The Vehicle Control Unit (VCU) can communicate with the MCU and send commands to the MCU.

[0141] 1605, the MCU continuously controls the corresponding IGBT bridge arm to conduct.

[0142] 1606. Has the MCU received the IGBT shutdown command from the vehicle controller? If yes, proceed to step 1607; otherwise, proceed to step 1605.

[0143] 1607, the MCU continuously controls the corresponding IGBT bridge arm to disconnect.

[0144] 1608. Is the MCU going to sleep? If not, proceed to step 1602; if yes, end this process.

[0145] In this embodiment of the application, the DC charging conditions need to simultaneously meet the following three conditions:

[0146] (1) The vehicle's OK light is not displayed;

[0147] (2) The motor speed is less than 10 revolutions per minute;

[0148] (3) There is a DC gun connection signal.

[0149] When all three conditions above are met, the system enters DC charging mode. After receiving a VCU request to control the IGBT to turn on, the MCU controls the IGBT to turn on. In this DC charging process, the MCU will not re-evaluate this signal. The MCU controls the IGBT bridge arm to turn on, and simultaneously, the VCU controls the negative contactor of the DC charging port to engage (i.e.,...). Figure 1 The switch module S1 in the battery 10 manager (BMC) pre-charges the capacitor in the DC charging circuit (this capacitor is the capacitor on the DC charging pile side). At this time, the current direction is: positive terminal of battery 10 → IGBT → positive terminal of DC charging port → negative terminal of DC charging port → negative contactor of DC charging port → negative terminal of battery 10. After successful pre-charging, VCU sends a charging ready signal to the charging pile. After receiving the charging ready signal, the charging pile determines whether the voltage is within the normal range. If it is within the normal range, the charging pile adjusts the output voltage. After adjustment, the charging pile controls the activation of relays K1 and K2 on the charging pile side. Figure 2 (Not shown in the diagram) Entering the charging stage, the current direction is: positive terminal of DC charging port (i.e., positive output of charging pile) → IGBT → positive terminal of battery 10 → negative terminal of battery 10 → negative contactor of DC charging port → negative terminal of DC charging port (i.e., negative output of charging pile). After entering the DC charging stage, the MCU determines the charging status as charging start, charging end, charging termination, charging pile fault, or charging pile active termination, and controls the IGBT bridge arm to turn off. After charging starts, the voltage on the IGBT charging pile side is greater than the voltage on the battery 10 pack side. According to the operating characteristics of IGBT, even if the MCU controls the IGBT to turn off, unidirectional conduction can still be achieved from the charging pile side to the battery 10 pack side.

[0150] To ensure safety, it is necessary to prevent the IGBT bridge arm from conducting when the charging gun is not plugged in and the charging port cover is open. In this case, current flows through the positive terminal of the battery pack 10, through the IGBT, and to the charging port, resulting in voltage at the charging port. Touching the charging port poses a risk of electric shock. The MCU needs to determine the status of the charging port cover while controlling the bridge arm status.

[0151] (1) When the charging port cover is open and there is no gun connection signal, the MCU is not allowed to control the IGBT bridge arm to conduct. At the same time, the instrument displays "The charging port cover is open and no charging gun is inserted. Please close the charging port cover or insert the charging gun in time."

[0152] (2) When the charging port cover is open and there is a DC gun connection signal, the normal DC charging process is entered, allowing the MCU to control the IGBT to conduct.

[0153] (3) When the charging port cover is open and there is an AC gun connection signal, the normal AC charging process is entered. The MCU is not allowed to control the IGBT to conduct. The AC charging current flows directly into the battery pack through the OBC without passing through the IGBT circuit.

[0154] (4) When the charging port cover is open and the AC gun and DC gun are connected at the same time, the MCU can control the IGBT to conduct. At this time, no one is at risk of electric shock, whether they are charging with AC, DC or AC and DC at the same time.

[0155] (5) When the charging port cover is closed, the MCU can control the IGBT bridge arm to conduct. When it is conducting, there is voltage in the charging port, but people cannot touch the charging port, so there is no safety risk.

[0156] During DC charging, the MCU can monitor the IGBT's operating status in real time. If the IGBT signal is abnormal, the MCU cannot control the IGBT to work and will forward the corresponding fault to the VCU, prompting the user that DC charging or driving functions cannot be performed due to IGBT abnormality. The manufacturing process of IGBT is relatively mature, and the probability of problems occurring during use is extremely low.

[0157] Figure 2The hardware implementation eliminates the positive contactor of the DC charging port, allowing DC charging to continue even without it. The power distribution scheme is also more reliable; even if one IGBT fails during charging, the other IGBT can be kept on via its body diode, providing double protection and ensuring the vehicle has enough charge to reach a nearby repair shop. The software modifications in this embodiment are as follows: the node controlling the positive contactor's engagement of the DC charging port is changed to a VCU requesting the MCU to control the IGBT bridge arm's conduction; the node controlling the positive contactor's disengagement of the DC charging port is changed to a VCU requesting the MCU to control the IGBT bridge arm's disengagement. The remaining control logic remains unchanged. The overall modifications are minor and easy to implement. This embodiment is applicable to non-boost-boost vehicles, but not to vehicles where the DC charging current needs to be boosted by the motor.

[0158] This application proposes a control method that uses an MCU to control the on / off switching of the IGBT bridge arm to replace the function of the positive contactor of the DC charging port. This achieves DC charging functionality with one less positive contactor for the DC charging port, reducing vehicle manufacturing costs and improving product competitiveness. This application only changes the power distribution line of the high-voltage harness, changing the connection from the positive terminal of the DC charging port to the positive terminal of the battery 10 to the positive terminal of the DC charging port to the IGBT. The new control method achieves DC charging functionality and has advantages such as simple control logic, low implementation difficulty, and low manufacturing cost.

[0159] On the one hand, the control logic is simple, requiring only minor modifications to the existing charging process to achieve the function. By eliminating the positive contactor at the DC charging port, the existing IGBT in the vehicle can be used to establish the DC charging positive circuit. On the other hand, the positive contactor at the DC charging port is at risk of scorching after repeated use, while IGBT control is more stable and reliable. The IGBT can more accurately detect whether its own operating status is normal and feed it back to the VCU, preventing the VCU from turning off the OK light and stopping the vehicle's power output due to an abnormal signal, thus reducing the risk of vehicle use and improving the user's riding experience.

[0160] This application embodiment can also provide an electrical device, which may include, for example: Figures 1 to 15 Any one of the charging devices. Please refer to [link / reference]. Figure 17 , Figure 17 This is a schematic diagram of the structure of an electrical device provided in an embodiment of this application. For example... Figure 17 As shown, the electrical equipment includes, Figures 1 to 15 The charging device shown is used to charge battery 10. This electrical device can be an electrically powered device. For example, it can include any of the following: a vehicle, an aircraft, a ship, or an energy storage unit.

[0161] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0162] In the several embodiments provided in this application, it should be understood that the disclosed charging device and electrical equipment can be implemented in other ways. For example, the charging device embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

Claims

1. A charging device, characterized in that, Includes a switch module, a bridge arm module, and a control module; The first end of the bridge arm module is adapted to be connected to the positive terminal of the battery, and the second end of the bridge arm module is adapted to be connected to the negative terminal of the battery. The midpoint of the bridge arm module is adapted to be connected to the positive terminal of the DC charging port, and the second end of the bridge arm module is connected to the negative terminal of the DC charging port through the switch module; or the midpoint of the bridge arm module is adapted to be connected to the negative terminal of the DC charging port, and the first end of the bridge arm module is connected to the positive terminal of the DC charging port through the switch module. When DC charging conditions are met, the control module controls the state of the switch module and the state of the bridge arm module so that the charging device charges the battery.

2. The charging device according to claim 1, characterized in that, The charging device also includes an inductor module, the first end of which is connected to the midpoint of the bridge arm of the bridge arm module.

3. The charging device according to claim 2, characterized in that, The second end of the inductor module is connected to either the positive terminal or the negative terminal of the DC charging port.

4. The charging device according to claim 2 or 3, characterized in that, The bridge arm module includes N bridge arm units connected in parallel, and each bridge arm unit includes an upper bridge switch and a lower bridge switch connected in series; the inductor module includes N inductors; the first end of the N inductors is the first end of the inductor module, the second end of the N inductors is the second end of the inductor module, and the midpoint of the bridge arm of each bridge arm unit is a point on the connection line between the upper bridge switch and the lower bridge switch of each bridge arm unit, where N is an integer greater than or equal to 1.

5. The charging device according to claim 4, characterized in that, The first end of each of the N inductors is connected to the midpoint of each of the N bridge arm units.

6. The charging device according to claim 4, characterized in that, When the midpoint of the bridge arm of the bridge arm module is adapted to be connected to the positive terminal of the DC charging port, at least one of the N bridge arm units has its midpoint connected to the positive terminal of the DC charging port. When the midpoint of the bridge arm of the bridge arm module is adapted to be connected to the negative terminal of the DC charging port, at least one of the N bridge arm units has its midpoint connected to the negative terminal of the DC charging port.

7. The charging device according to any one of claims 4 to 6, characterized in that, The control module controls the state of the switch module and the state of the bridge arm module, including: When the midpoint of the bridge arm module is suitable for connection with the positive terminal of the DC charging port, the control module controls the switch module to be in a closed state, controls the upper bridge switch tube connected to the positive terminal of the DC charging port in the bridge arm module to be turned on, and controls all N lower bridge switch tubes of the bridge arm module to be turned off. When the midpoint of the bridge arm module is suitable for connection with the negative terminal of the DC charging port, the control module controls the switch module to be in a closed state, controls the lower bridge switch tube connected to the negative terminal of the DC charging port in the bridge arm module to be turned on, and controls all N upper bridge switches of the bridge arm module to be turned off.

8. The charging device according to any one of claims 4 to 6, characterized in that, The control module controls the state of the switch module and the state of the bridge arm module, including: When the midpoint of the bridge arm module is suitable for connection with the positive terminal of the DC charging port, the control module controls the switch module to be in a closed state and controls all N lower bridge switches of the bridge arm module to be disconnected. When the midpoint of the bridge arm module is suitable for connection with the negative terminal of the DC charging port, the control module controls the switch module to be in a closed state and controls all N upper bridge switches of the bridge arm module to be disconnected.

9. The charging device according to any one of claims 1 to 8, characterized in that, The DC charging conditions include: the vehicle's indicator lights are not displayed, the vehicle's motor speed is less than a set threshold, and a DC charging gun connection signal is detected.

10. The charging device according to any one of claims 1 to 8, characterized in that, When the charging port cover is detected to be open and there is no gun connection signal, the control module controls the switching transistor in the bridge arm module to disconnect. When the charging port cover is detected to be open and an AC gun connection signal is detected, the control module controls the switching transistor in the bridge arm module to disconnect.

11. An electrical appliance, characterized in that, Includes the charging device as described in any one of claims 1 to 10.

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