A charging and discharging circuit, method, system, electronic device and vehicle

Abstract

The present application provides a charging and discharging circuit, method, system, electronic device and vehicle, which relate to the field of charging and discharging technology. When the charging and discharging current of the charging and discharging circuit is less than or equal to the charging and discharging current threshold, the first switch is disconnected and the second switch is turned on, so that the motor transformer module is connected to the charging and discharging port through the inductive device in the inductive branch, and charging and discharging are realized through the charging and discharging port. In this process, the inductance is increased due to the action of the inductive device, so that the energy loss of the components in the motor transformer module is reduced, thereby improving the charging and discharging efficiency.

Description

Technical Field

[0001] The present application belongs to the field of charging and discharging technology, and specifically relates to a charging and discharging circuit, method, system, electronic device and vehicle. Background Art

[0002] An electric vehicle (EV) is a vehicle that uses electricity as its power source. An electric vehicle is equipped with a battery that can receive and store electricity provided by a charging station. During the driving process of the electric vehicle, the battery releases the stored electricity to drive the electric vehicle.

[0003] In the prior art, since the charging voltage output by the charging pile is lower than the standard charging voltage of the battery of the electric vehicle, a voltage boosting circuit is used to increase the charging voltage to the standard charging voltage to charge the battery of the electric vehicle.

[0004] However, during the charging and discharging process of the battery of an electric vehicle, the energy loss of the components in the voltage boost circuit is large, resulting in low charging and discharging efficiency. Summary of the invention

[0005] The present application aims to provide a charging and discharging circuit, method, system, electronic device and vehicle.

[0006] In order to solve the above technical problems, this application is implemented as follows:

[0007] In a first aspect, an embodiment of the present application provides a charging and discharging circuit, comprising: a motor transformer module, a first switch, one end of the first switch being connected to the motor transformer module, and the other end of the first switch being used to connect to a charging and discharging port, the charging and discharging circuit also comprising an inductor branch, the inductor branch comprising an inductive device and a second switch connected in series, one end of the inductor branch being connected between the motor transformer module and the first switch, and the other end of the inductor branch being used to electrically connect to the charging and discharging port.

[0008] Optionally, the motor transformation module includes an inverter and a motor, one end of the first switch is connected to the motor, the motor is electrically connected to the inverter, and one end of the inductor branch is connected between the motor and the first switch.

[0009] Optionally, the inverter includes multiple bridge arms, each of the bridge arms includes two power switch units, the motor includes multiple motor coils, each of the motor coils is connected to a midpoint of the bridge arm, and the midpoint is the connection point of the two power switch units.

[0010] Optionally, the plurality of motor coils of the motor are connected to a neutral point of the motor, one end of the inductance branch is electrically connected between the neutral point and the first switch, and the first switch is electrically connected to the neutral point.

[0011] Optionally, the multiple motor coils of the motor include a first coil and at least one second coil, the first coil is connected in series with the at least one second coil, one end of the inductance branch is electrically connected between the first coil and the first switch, and the first switch is connected to the first coil.

[0012] Optionally, there are multiple second coils, and the multiple second coils are connected in parallel.

[0013] Optionally, the charging and discharging circuit includes a first mode, in which the first switch is turned on and the second switch is turned off;

[0014] The charge and discharge circuit further includes a second mode, in which the first switch is disconnected and the second switch is turned on.

[0015] Optionally, when the charge and discharge current of the charge and discharge circuit is greater than a charge and discharge current threshold, the charge and discharge circuit is in the first mode;

[0016] When the charge and discharge current is less than or equal to the charge and discharge current threshold, the charge and discharge circuit is in the second mode.

[0017] Optionally, there are multiple inductor branches, and the multiple inductor branches are connected in parallel.

[0018] Optionally, in the first mode, the first switch is turned on, and the second switch of each of the inductor branches is turned off;

[0019] In the second mode, the first switch is open; in the inductor branch, the second switch of the target inductor branch matching the charge and discharge current of the charge and discharge circuit is turned on, and the second switches of other inductor branches except the target inductor branch are open.

[0020] Optionally, the charging and discharging circuit further includes a fifth switch;

[0021] The first end of the fifth switch is used to be electrically connected to the second electrode of the first power source, and the second end of the fifth switch is used to be electrically connected to the second electrode of the charge and discharge port.

[0022] Optionally, the charging and discharging circuit further includes a sixth switch;

[0023] The first end of the sixth switch is used to be electrically connected to the first electrode of the first power source, and the second end of the sixth switch is used to be electrically connected to the first electrode of the charge and discharge port.

[0024] In a second aspect, an embodiment of the present application further provides a charging and discharging method, which is used in the charging and discharging circuit described in the first aspect, and the method includes:

[0025] When the charge and discharge current of the charge and discharge circuit is greater than the charge and discharge current threshold, controlling the first switch of the charge and discharge circuit to be turned on, and controlling the second switch in the inductance branch of the charge and discharge circuit to be turned off;

[0026] When the charge and discharge current is less than or equal to the charge and discharge current threshold, the first switch is controlled to be turned off, and the second switch is controlled to be turned on.

[0027] In a third aspect, an embodiment of the present application further provides an electronic device, comprising a processor, wherein the processor is connected to a memory, the memory stores a computer program, and the processor is used to execute the computer program to implement the method described in the second aspect.

[0028] In a fourth aspect, an embodiment of the present application further provides a charging and discharging system, comprising the charging and discharging circuit described in the first aspect and the electronic device described in the third aspect.

[0029] In a fifth aspect, an embodiment of the present application further provides a vehicle, comprising the charging and discharging circuit as described in the first aspect, or comprising the electronic device as described in the third aspect, or comprising the charging and discharging system as described in the fourth aspect.

[0030] In the embodiment of the present application, the charge and discharge port can be connected to the motor transformer module via the inductor branch, so that the energy loss of components in the motor transformer module is reduced, thereby improving the charge and discharge efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below.

[0032] Figure 1 It is a structural schematic diagram of a charging and discharging circuit provided in an embodiment of the present application;

[0033] Figure 2 is a structural schematic diagram of another charging and discharging circuit provided in an embodiment of the present application;

[0034] Figure 3 It is a partial structural schematic diagram of a charging and discharging circuit provided in an embodiment of the present application;

[0035] Figure 4is another partial structural schematic diagram of a charging and discharging circuit provided in an embodiment of the present application;

[0036] Figure 5 This is another partial structural diagram of the charging and discharging circuit provided in the embodiment of the present application;

[0037] Figure 6 is yet another partial structural schematic diagram of a charging and discharging circuit provided in an embodiment of the present application;

[0038] Figure 7 It is a schematic diagram of the current loop of the first stage of boost charging provided by an embodiment of the present application;

[0039] Figure 8 It is a schematic diagram of the current loop of the second stage of boost charging provided by an embodiment of the present application;

[0040] Fig. 9 It is a schematic diagram of the current loop of the first stage of the step-down discharge provided in the embodiment of the present application;

[0041] Fig.10 It is a schematic diagram of the current loop of the second stage of the step-down discharge provided in the embodiment of the present application;

[0042] Fig.11 is a flowchart of the steps of the charging and discharging method provided in an embodiment of the present application;

[0043] Fig.12 is a charging flow chart of the charging and discharging circuit provided in an embodiment of the present application;

[0044] Fig.13 It is a discharge flow chart of the charge and discharge circuit provided in the embodiment of the present application.

[0045] Reference numerals:

[0046] 10 - motor transformer module; 11 - inverter; 12 - motor; 121 - first coil; 122 - second coil; 20 - inductor branch; 30 - first power supply; 40 - second power supply; k1 - first switch; 50 - load. DETAILED DESCRIPTION

[0047] 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 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 ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0049] Reference Figure 1 An embodiment of the present application provides a charge and discharge circuit, including: a motor transformer module 10, a first switch k1, one end of the first switch k1 is connected to the motor transformer module 10, and the other end of the first switch k1 is used to connect to the charge and discharge port 101, the charge and discharge circuit also includes an inductor branch 20, the inductor branch 20 includes an inductive device and a second switch connected in series, one end of the inductor branch 20 is connected between the motor transformer module 10 and the first switch k1, and the other end of the inductor branch 20 is used to electrically connect to the charge and discharge port 101.

[0050] Specifically, refer to Figure 2 When the charge and discharge circuit is used for charging, the motor transformer module 10 is used to be electrically connected to the first power supply 30, and the charge and discharge port 101 is used to be electrically connected to the second power supply 40. Under the voltage increase effect of the motor transformer module 10, the first power supply 30 is charged by the second power supply 40; when the charge and discharge circuit is used for discharging, the motor transformer module 10 is used to be electrically connected to the first power supply 30, and the charge and discharge port 101 is used to be electrically connected to the load 50. Under the voltage reduction effect of the motor transformer module 10, the load 50 is powered by the first power supply 30.

[0051] It should be noted that the first power source 30 may be a DC power source, such as a battery; the second power source 40 may be a DC power source, such as a charging pile.

[0052] Since the charging voltage output by the second power source 40 is lower than the charging voltage of the first power source 30 , the motor transformer module 10 is used to increase the charging voltage to the charging voltage of the first power source 30 to charge the first power source 30 .

[0053] The inductive device should be matched with the charge and discharge current to avoid excessive charge and discharge current which may damage the inductive device.

[0054] In some embodiments, the first switch k1 may be a relay, the second switch may be a relay, and the inductive device may be an inductor.

[0055] In an embodiment of the present application, when the charge and discharge current of the charge and discharge circuit is less than or equal to the charge and discharge current threshold, the first switch is opened and the second switch is turned on, so that the motor transformer module is connected to the charge and discharge port 101 through the inductive device in the inductive branch, and charging and discharging is realized through the charge and discharge port 101. In this process, the inductance is increased and the ripple current is reduced due to the action of the inductive device, so that the energy loss of the components in the motor transformer module is reduced, thereby improving the charging and discharging efficiency.

[0056] Optionally, the motor transformation module 10 includes an inverter 11 and a motor 12 , one end of the first switch k1 is connected to the motor 12 , the motor 12 is electrically connected to the inverter 11 , and one end of the inductor branch 20 is connected between the motor 12 and the first switch k1 .

[0057] It should be noted that the motor 12 can be a multi-phase motor, for example, the motor 12 can be a three-phase motor, a five-phase motor, a six-phase motor, etc.; the inverter 11 is used to be electrically connected to the first power supply 30, and the inverter 11 can be an inverter matching the motor 12, for example, the inverter 11 can be a three-phase inverter matching the three-phase motor, a five-phase inverter matching the five-phase motor, and a six-phase inverter matching the six-phase motor.

[0058] In the embodiment of the present application, through the control of the inverter 11, the motor coil in the motor 12 is first charged, and then the motor coil of the motor 12 is discharged to increase the charging voltage to the charging voltage of the first power supply 30, thereby charging the first power supply 30.

[0059] Optionally, the inverter 11 includes a plurality of bridge arms, each bridge arm includes two power switch units, and the motor 12 includes a plurality of motor coils, each motor coil is connected to a midpoint of a bridge arm, and the midpoint is a connection point of the two power switch units.

[0060] Specifically, each bridge arm includes two power switch units, namely, a power switch unit of the upper bridge (the third switch) and a power switch unit of the lower bridge (the fourth switch). The power switch units of the upper bridge correspond one-to-one to the motor coils, and the power switch units of the lower bridge correspond one-to-one to the motor coils; the first end of the power switch unit of the upper bridge is electrically connected to the first end of the motor coil corresponding to the power switch unit of the upper bridge, and the second end of the power switch unit of the upper bridge is used to be electrically connected to the first electrode of the first power supply 30; the first end of the power switch unit of the lower bridge is electrically connected to the first end of the motor coil corresponding to the power switch unit of the lower bridge, and the second end of the power switch unit of the lower bridge is used to be electrically connected to the second electrode of the second power supply 40; the second end of the motor coil is electrically connected to the inductive device.

[0061] The inverter 11 further includes a second capacitor C2, a first end of the second capacitor C2 is electrically connected to a first electrode of the first power source 30, a second end of the second capacitor C2 is electrically connected to a second electrode of the first power source 30, and the second capacitor C2 is used for filtering.

[0062] In some embodiments, the first electrode of the first power supply 30 is the positive electrode of the first power supply 30, the second electrode of the first power supply 30 is the negative electrode, the first electrode of the second power supply 40 is the positive electrode of the first power supply 30, and the second electrode of the second power supply 40 is the negative electrode; the power switch unit of the upper bridge and the power switch unit of the lower bridge can both be MOS tubes, such as NMOS tubes or PMOS tubes, wherein the MOS tube Q1 is a metal-oxide semiconductor field-effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor), the NMOS tube is a negative channel metal oxide semiconductor tube (Negative channel MetalOxide Semiconductor), and the PMOS tube is a positive channel metal oxide semiconductor tube (Positive channel MetalOxide Semiconductor); in other embodiments, the power switch unit can also be an insulated gate bipolar transistor (IGBT, Insulate-Gate Bipolar Transistor) or a gallium nitride high electron mobility transistor (GaN HEMT).

[0063] For example, refer to Figure 3 The charging and discharging circuit includes an inductor branch 20 and a first switch k1, the inductor branch 20 includes an inductive device L2a and a second switch k2a, the inverter 11 is a three-phase inverter, including three upper bridge power switch units and three lower bridge power switch units, namely, upper bridge power switch unit k3a, upper bridge power switch unit k3b, upper bridge power switch unit k3c, lower bridge power switch unit k4a, lower bridge power switch unit k4b, lower bridge power switch unit k4c, each upper bridge power switch unit and each lower bridge power switch unit are NMOS tubes; the motor 12 is a three-phase motor 12, including three motor coils, namely, motor coil L2, motor coil L3, and motor coil L4; the charging and discharging circuit also includes a fifth switch k5;

[0064] Wherein, the first end of the inductive device L2a is electrically connected to the first end of the second switch k2a, the second end of the inductive device L2a is electrically connected to the second end of the motor coil L2, the second end of the motor coil L3, and the second end of the motor coil L4, the second end of the second switch k2a is electrically connected to the first electrode of the second power supply 40, the first end of the first switch k1 is electrically connected to the second end of the motor coil L2, the second end of the motor coil L3, and the second end of the motor coil L4, and the second end of the first switch k1 is electrically connected to the first electrode of the second power supply 40;

[0065] The drain of the power switch unit k3a of the upper bridge is electrically connected to the first end of the motor coil L4, and the source of the power switch unit k3a of the upper bridge is electrically connected to the positive electrode of the first power supply 30; the source of the power switch unit k4a of the lower bridge is electrically connected to the first end of the motor coil L4, and the drain of the power switch unit k4a of the lower bridge is electrically connected to the negative electrode of the second power supply 40 through the fifth switch k5;

[0066] The drain of the power switch unit k3b of the upper bridge is electrically connected to the first end of the motor coil L3, and the source of the power switch unit k3b of the upper bridge is electrically connected to the positive electrode of the first power supply 30; the source of the power switch unit k4b of the lower bridge is electrically connected to the first end of the motor coil L3, and the drain of the power switch unit k4b of the lower bridge is electrically connected to the negative electrode of the second power supply 40 through the fifth switch k5;

[0067] The drain of the power switch unit k3c of the upper bridge is electrically connected to the first end of the motor coil L2, and the source of the power switch unit k3c of the upper bridge is electrically connected to the positive pole of the first power supply 30; the source of the power switch unit k4c of the lower bridge is electrically connected to the first end of the motor coil L2, and the drain of the power switch unit k4c of the lower bridge is electrically connected to the negative pole of the second power supply 40 through the fifth switch k5.

[0068] In an embodiment of the present application, the power switch unit of the lower bridge is first turned on, while the power switch unit of the upper bridge corresponding to the power switch unit of the lower bridge is kept turned off, so that the second power supply 40 charges the motor coil corresponding to the power switch unit of the lower bridge in the motor 12, and then the power switch unit of the upper bridge is turned on, while the power switch unit of the lower bridge corresponding to the power switch unit of the upper bridge is kept turned off, and the motor coil is used to increase the charging voltage to the charging voltage of the first power supply 30 to charge the first power supply 30.

[0069] Optionally, a plurality of motor coils of the motor 12 are connected to the neutral point of the motor 12 , one end of the inductor branch 20 is electrically connected between the neutral point and the first switch k1 , and the first switch k1 is electrically connected to the neutral point.

[0070] In the embodiment of the present application, the inductor branch 20 is connected in series with the motor coil to increase the inductance of the charge and discharge circuit, reduce the ripple current, and reduce the energy loss of the power switch unit of the inverter 11, thereby improving the charge and discharge efficiency.

[0071] Alternatively, if Figure 4 As shown, the multiple motor coils of the motor 12 include a first coil 121 and at least one second coil 122, the first coil 121 is connected in series with the at least one second coil 122, one end of the inductor branch 20 is electrically connected between the first coil 121 and the first switch k1, and the first switch k1 is connected to the first coil 121.

[0072] In the embodiment of the present application, the inductor branch 20 is connected in series with the first coil 121 to increase the inductance and reduce the ripple current, thereby reducing the energy loss of the power switch unit of the inverter 11 and improving the charging and discharging efficiency.

[0073] Optionally, there are multiple second coils 122 , and the multiple second coils 122 are connected in parallel.

[0074] In an embodiment of the present application, through the control of the inverter 11, the first coil 121 and the multiple second coils 122 in the motor 12 are first charged, and then the multiple second coils of the motor 12 are discharged to increase the charging voltage to the charging voltage of the first power supply 30, thereby charging the first power supply 30.

[0075] Optionally, the charge and discharge circuit includes a first mode, in which the first switch k1 is turned on and the second switch is turned off; the charge and discharge circuit also includes a second mode, in which the first switch k1 is turned off and the second switch is turned on.

[0076] In the embodiment of the present application, the total inductance of the charge and discharge circuit can be controlled by controlling the first switch k1 and the second switch. Specifically, the total inductance of the charge and discharge circuit in the first mode is smaller than the total inductance of the charge and discharge circuit in the second mode.

[0077] Optionally, when the charge and discharge current of the charge and discharge circuit is greater than the charge and discharge current threshold, the charge and discharge circuit is in the first mode; when the charge and discharge current is less than or equal to the charge and discharge current threshold, the charge and discharge circuit is in the second mode.

[0078] It should be noted that the charge and discharge current threshold is the maximum current value allowed to pass through the inductive device of the inductive branch 20. When the current of the inductive device is greater than the charge and discharge current threshold, the inductive device is at risk of being damaged.

[0079] Optionally, there are multiple inductor branches 20, and the multiple inductor branches 20 are connected in parallel.

[0080] It should be noted that the charge and discharge current threshold is greater than or equal to the maximum current value allowed to pass through the inductive device of each inductive branch 20. Specifically, in some embodiments, the inductive branch with the largest maximum current value allowed to pass through the inductive branch 20 is the threshold inductive branch, and the charge and discharge current threshold is equal to the maximum current value allowed to pass through the threshold inductive branch.

[0081] For example, refer to Figure 5 The charging and discharging circuit includes two inductance branches 20 and a first switch k1, one inductance branch 20 includes an inductance device L2a and a second switch k2a, and the other inductance branch 20 includes an inductance device L2b and a second switch k2b, wherein a first end of the inductance device L2a is electrically connected to a first end of the second switch k2a, a second end of the inductance device L2a is electrically connected to an input end of the motor transformer module 10, and a second end of the second switch k2a is electrically connected to a first electrode of a second power source 40; a first end of the inductance device L2b is electrically connected to a first end of the second switch k2b, a second end of the inductance device L2b is electrically connected to an input end of the motor transformer module 10, and a second end of the second switch k2b is electrically connected to a first electrode of the second power source 40; a first end of the first switch k1 is electrically connected to an input end of the motor transformer module 10, and a second end of the first switch k1 is electrically connected to a first electrode of the second power source 40.

[0082] Optionally, in the first mode, the first switch k1 is turned on, and the second switch of each inductor branch 20 is turned off;

[0083] In the second mode, the first switch k1 is open; in the inductor branch 20, the second switch of the target inductor branch matching the charge and discharge current of the charge and discharge circuit is turned on, and the second switches of other inductor branches except the target inductor branch are open.

[0084] For example, the charge and discharge circuit includes two inductance branches 20 and a first switch k1, one inductance branch 20 includes an inductance device L2a and a second switch k2a, and the other inductance branch 20 includes an inductance device L2b and a second switch k2b, wherein the maximum current value allowed to pass through the inductance device L2a is less than the maximum current value allowed to pass through the inductance device L2b. In the second mode, when the charge and discharge current is less than or equal to the maximum current value allowed to pass through the inductance device L2a, the inductance branch 20 to which the inductance device L2a belongs is the target inductance branch, the second switch k2a is turned on, and the second switch k2b and the first switch k1 are disconnected; when the charge and discharge current is greater than the maximum current value allowed to pass through the inductance device L2a, and the charge and discharge current is less than or equal to the maximum current value allowed to pass through the inductance device L2b, the inductance branch 20 to which the inductance device L2b belongs is the target inductance branch, the second switch k2b is turned on, and the second switch k2a and the first switch k1 are disconnected.

[0085] Optionally, in the second mode, the second switches of some of the multiple inductor branches 20 may be turned on, or the second switches of all the multiple inductor branches may be turned on. The number of inductor branches that are turned on and the inductor branches that are turned on may be determined according to the charging power requirement and the maximum current value supported by the inductive device of the inductor branch.

[0086] The inductive device in any of the above embodiments of the present application may be, for example, a coil.

[0087] In the embodiment of the present application, when the charge and discharge current is less than or equal to the charge and discharge current threshold, the first switch k1 is disconnected and the second switch of the target inductor branch is turned on, and the inductive device in the target inductor branch matches the charge and discharge current of the charge and discharge circuit, thereby avoiding damage to the inductive device due to the charge and discharge current exceeding the maximum current value allowed to pass through the inductive device; when the charge and discharge current is greater than the charge and discharge current threshold, the first switch k1 is turned on and the second switch of each inductor branch 20 is disconnected, thereby effectively protecting the inductive device of the inductor branch 20 from damage.

[0088] It should be noted that the first mode and the second mode of the charge and discharge circuit can be switched with each other.

[0089] Optionally, the charge and discharge circuit further includes a fifth switch k5 ; a first end of the fifth switch k5 is used to be electrically connected to the second electrode of the first power source 30 , and a second end of the fifth switch k5 is used to be electrically connected to the second electrode 101 b of the charge and discharge port 101 .

[0090] It should be noted that the charge and discharge circuit further includes a first capacitor C1, a first end of the first capacitor C1 is electrically connected to the first electrode of the second power supply 40, a second end of the first capacitor C1 is electrically connected to the first end of the fifth switch k5, and the first capacitor C1 is used for filtering.

[0091] Specifically, the fifth switch k5 may be a relay.

[0092] In the embodiment of the present application, the fifth switch k5 is turned on to electrically connect the negative electrode of the second power source 40 to the negative electrode of the first power source 30 , thereby enabling the second power source 40 to charge the first power source 30 .

[0093] Optionally, refer to Figure 6 The charge and discharge circuit further includes a sixth switch k6; a first end of the sixth switch k6 is used to be electrically connected to the first electrode of the first power source 30, and a second end of the sixth switch k6 is used to be electrically connected to the first electrode 101a of the charge and discharge port 101.

[0094] Specifically, the sixth switch k6 may be a relay.

[0095] In the embodiment of the present application, when the charging voltage of the second power supply 40 is lower than the charging voltage of the first power supply 30, the motor transformer module 10 is used to increase the charging voltage to charge the first power supply 30; because when the charging voltage of the second power supply 40 is greater than or equal to the standard charging voltage of the first power supply 30, the sixth switch k6 and the fifth switch k5 are both turned on, and the second switch and the first switch k1 are both turned off, so that the second power supply 40 directly charges the first power supply 30.

[0096] Optionally, refer to Figure 7 , one end of each upper bridge power switch unit is electrically connected to the positive electrode of the first power source 30, one end of each lower bridge power switch unit is electrically connected to the negative electrode of the second power source 40 through the fifth switch k5, the first electrode 101a of the charge and discharge port 101 is electrically connected to the positive electrode of the second power source 40, and the second electrode 101b of the charge and discharge port 101 is electrically connected to the negative electrode of the second power source 40;

[0097] In the first stage of boost charging of the charge-discharge circuit, the charging current flows out from the positive electrode of the second power supply 40 along the direction e1, passes through the first switch k1 or the inductor branch 20 along the direction e2, passes through the motor coil of the motor 12 along the direction e3, passes through the power switch unit of the lower bridge along the direction e4, and then flows back to the negative electrode of the second power supply 40 along the direction e5 to charge the motor coil;

[0098] Reference Figure 8 In the second stage of boost charging of the charge and discharge circuit, the charging current flows out from the positive electrode of the second power supply 40 along the direction of f1, then passes through the first switch k1 or the inductor branch 20 along the direction of f2, then passes through the motor coil of the motor 12 along the direction of f3, and then passes through the power switch unit of the upper bridge along the direction of f4, and then flows to the positive electrode of the first power supply 30 along the direction of f5. After that, the charging current flows out from the negative electrode of the first power supply 30 along the direction of f6, and then flows back to the negative electrode of the second power supply 40 through the fifth switch k5 along the direction of f7, so as to realize the voltage superposition through the second power supply 40 and the motor coil of the motor 12, increase the charging voltage, and charge the first power supply 30.

[0099] Optionally, refer to Fig. 9 , one end of each upper bridge power switch unit is electrically connected to the positive electrode of the first power source 30, one end of each lower bridge power switch unit is electrically connected to the negative electrode of the load 50 through the fifth switch k5, the first electrode 101a of the charge and discharge port 101 is electrically connected to the positive electrode of the load 50, and the second electrode 101b of the charge and discharge port 101 is electrically connected to the negative electrode of the load 50;

[0100] In the first stage of the step-down discharge of the charging and discharging circuit, the discharge current flows out from the positive electrode of the first power supply 30 along the direction of g1, then passes through the power switch unit of the upper bridge along the direction of g2, and then passes through the motor coil of the motor 12 along the direction of g3, at this time the motor coil is charged, and then passes through the first switch k1 or the inductor branch 20 along the direction of g4, and then flows to the positive electrode of the load 50 along the direction of g5. After that, the discharge current flows out from the negative electrode of the load 50 along the direction of g6, and then flows back to the negative electrode of the first power supply 30 along the direction of g7, so as to realize the output voltage of the first power supply 30 being divided by the motor coil of the motor 12, thereby reducing the supply voltage and supplying power to the load 50.

[0101] Reference Fig.10 In the second stage of the step-down discharge of the charge and discharge circuit, the discharge current flows out from the motor coil of the motor 12 along the direction of h1, then passes through the first switch k1 or the inductor branch 20 along the direction of h2, then flows to the positive electrode of the load 50 along the direction of h3, then flows out from the negative electrode of the load 50 along the direction of h4, and then flows back to the motor coil of the motor 12 through the power switch unit of the lower bridge along the direction of h5, so as to realize discharge through the motor coil of the motor 12 and supply power to the load 50.

[0102] Optionally, the charge and discharge circuit further includes a controller, which is used to control the on and off of the first switch k1, the second switch, the third switch (the power switch unit of the upper bridge), the fourth switch (the power switch unit of the lower bridge), the fifth switch k5, and the sixth switch k6.

[0103] In summary, in the embodiment of the present application, when the charge and discharge current of the charge and discharge circuit is less than or equal to the charge and discharge current threshold, the first switch k1 is disconnected and the second switch is turned on, so that the motor transformer module 10 is connected to the charge and discharge port through the inductive device in the inductive branch 20, and charging and discharging are realized through the charge and discharge port. In this process, the inductance is increased and the ripple current is reduced due to the action of the inductive device, so that the energy loss of the components in the motor transformer module 10 is reduced, thereby improving the charging and discharging efficiency.

[0104] Reference Fig.11 The embodiment of the present application further provides a charging and discharging method for the aforementioned charging and discharging circuit, the method comprising:

[0105] Step 101 : When the charge and discharge current of the charge and discharge circuit is greater than the charge and discharge current threshold, control the first switch of the charge and discharge circuit to be turned on, and control the second switch in the inductance branch of the charge and discharge circuit to be turned off.

[0106] The implementation method of this step is similar to the specific implementation process of the aforementioned charge and discharge circuit, and will not be repeated here.

[0107] Step 102: When the charge-discharge current is less than or equal to the charge-discharge current threshold, control the first switch to be turned off, and control the second switch to be turned on.

[0108] The implementation method of this step is similar to the specific implementation process of the aforementioned charge and discharge circuit, and will not be repeated here.

[0109] Optionally, refer to Fig.12 , the charging process of the charge-discharge circuit includes: X1, whether the charging voltage is greater than the charging voltage of the first power supply 30, that is, judging whether the charging voltage of the second power supply 40 is greater than the charging voltage of the first power supply 30; X2, charging in the third mode, that is, when the charging voltage of the second power supply 40 is greater than or equal to the charging voltage of the first power supply 30, the sixth switch k6 and the fifth switch k5 are both turned on, and the second switch and the first switch k1 are kept off, so that the second power supply 40 directly charges the first power supply 30; X3, whether the charging current is less than the charging current threshold, that is, when the charging voltage of the second power supply 40 is less than the charging voltage of the first power supply 30, judging whether the charging current is less than the charging current threshold; X4, charging in the second mode, that is, when the charging current is less than the charging current threshold, the charge-discharge circuit charges in the second mode; X5, charging Whether the current is less than the charging current threshold, that is, whether the charging current is less than the charging current threshold; X6, switch to the first mode for charging, that is, when the charging current is greater than the charging current threshold, the charging and discharging circuit switches to the first mode for charging; X7, charge in the first mode, that is, when the charging current is greater than the charging current threshold, the charging and discharging circuit charges in the first mode; X8, whether the charging current is less than the charging current threshold, that is, whether the charging current is less than the charging current threshold; X9, switch to the second mode for charging, that is, when the charging current is less than the charging current threshold, the charging and discharging circuit switches to the second mode for charging; X10, continue charging, that is, the charging and discharging circuit charges in the original mode. The specific process is similar to the specific implementation process of the aforementioned charging and discharging circuit, which will not be repeated here. The charging current threshold is equal to the charging and discharging current threshold.

[0110] Optionally, refer to Fig.13, the discharge process of the charge and discharge circuit includes: Y1, whether the discharge current is less than the discharge current threshold, that is, judging whether the discharge current is less than the discharge current threshold; Y2, discharging in the second mode, that is, when the discharge current is less than the discharge current threshold, the charge and discharge circuit discharges in the second mode; Y3, whether the discharge current is less than the discharge current threshold, that is, judging whether the discharge current is less than the discharge current threshold; Y4, switching to the first mode for discharge, that is, when the discharge current is greater than the discharge current threshold, the charge and discharge circuit switches to the first mode for discharge; Y5, discharging in the first mode, that is, when the discharge current is greater than the discharge current threshold, the charge and discharge circuit discharges in the first mode; Y6, whether the discharge current is less than the discharge current threshold, that is, judging whether the discharge current is less than the discharge current threshold; Y7, switching to the second mode for discharge, that is, when the discharge current is less than the discharge current threshold, the charge and discharge circuit switches to the second mode for discharge; Y8, continuing to discharge, that is, the charge and discharge circuit discharges in the original mode, the specific process is similar to the specific implementation process of the aforementioned charge and discharge circuit, and will not be repeated here, wherein the discharge current threshold is equal to the charge and discharge current threshold.

[0111] An embodiment of the present application also provides an electronic device, including a processor, the processor is connected to a memory, the memory stores a computer program, the processor is used to execute the computer program to implement the aforementioned charging and discharging method, the specific implementation process is similar to the aforementioned, and will not be repeated here.

[0112] The electronic device of this embodiment can be deployed in the controller of the above embodiment.

[0113] The embodiment of the present application also provides a charging and discharging system, including the aforementioned charging and discharging circuit and the aforementioned electronic device. The specific implementation process is similar to the aforementioned one and will not be repeated here.

[0114] An embodiment of the present application also provides a vehicle, including the aforementioned charging and discharging circuit, or including the aforementioned electronic device, or including the aforementioned charging and discharging system. The specific implementation process is similar to the aforementioned process and will not be repeated here.

[0115] In order to improve efficiency and mileage, more and more vehicles are designed with batteries having a charging voltage of 800 volts or higher. However, most of the current fast charging piles can only charge batteries with a charging voltage of 200 volts to 500 volts. Therefore, a boost converter is needed to boost the voltage provided by the charging pile to charge the vehicle's battery.

[0116] In the related art, a large-capacity boost converter that boosts 400V to 800V or higher has a large weight and volume, and is costly.

[0117] Through the embodiment of the present application, an inverter is used to convert the external charging power provided to the neutral point of the motor 12, and then the converted power is provided to the battery to charge the battery. This not only achieves boost charging but also has a lower cost.

[0118] In summary, in the embodiment of the present application, when the charge and discharge current of the charge and discharge circuit is less than or equal to the charge and discharge current threshold, the first switch k1 is disconnected and the second switch is turned on, so that the motor transformer module 10 is connected to the charge and discharge port through the inductive device in the inductive branch 20, and charging and discharging are realized through the charge and discharge port. In this process, the inductance is increased and the ripple current is reduced due to the action of the inductive device, so that the energy loss of the components in the motor transformer module 10 is reduced, thereby improving the charging and discharging efficiency.

[0119] It should be noted that, in this article, the term "comprises", "includes" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the method and device in the embodiment of the present application is not limited, and the functions are performed in the order shown or discussed, and may also include performing the functions in a substantially simultaneous manner or in the opposite order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0120] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A charging and discharging circuit, It is characterized in that include: A motor voltage conversion module (10), a first switch (k1), one end of the first switch (k1) being connected to the motor voltage conversion module (10), the other end of the first switch (k1) being used to connect to a charge and discharge port (101), the charge and discharge circuit further comprising an inductor branch (20), the inductor branch (20) comprising an inductive device and a second switch connected in series, one end of the inductor branch (20) being connected between the motor voltage conversion module (10) and the first switch (k1), the other end of the inductor branch (20) being used to electrically connect to the charge and discharge port (101); The charging and discharging circuit comprises a first mode, in which the first switch (k1) is turned on and the second switch is turned off; The charging and discharging circuit further comprises a second mode, in which the first switch (k1) is disconnected and the second switch is turned on; The number of the inductor branches (20) is multiple, and the multiple inductor branches (20) are connected in parallel; In the first mode, the first switch (k1) is turned on, and the second switch of each of the inductor branches (20) is turned off; In the second mode, the first switch (k1) is open; in the inductor branch (20), the second switch of the target inductor branch matching the charge and discharge current of the charge and discharge circuit is turned on, and the second switches of other inductor branches other than the target inductor branch are open.

2. The charge and discharge circuit according to claim 1, It is characterized in that The motor voltage conversion module (10) comprises an inverter (11) and a motor (12), one end of the first switch (k1) is connected to the motor (12), the motor (12) is electrically connected to the inverter (11), and one end of the inductor branch (20) is connected between the motor (12) and the first switch (k1).

3. The charge and discharge circuit according to claim 2, It is characterized in that The inverter (11) comprises a plurality of bridge arms, each of the bridge arms comprises two power switch units, and the motor (12) comprises a plurality of motor coils, each of the motor coils is connected to a midpoint of the bridge arm, and the midpoint is a connection point of the two power switch units.

4. The charge and discharge circuit according to claim 2, It is characterized in that A plurality of motor coils of the motor (12) are connected to a neutral point of the motor (12), one end of the inductor branch (20) is electrically connected between the neutral point and the first switch (k1), and the first switch (k1) is electrically connected to the neutral point.

5. The charge and discharge circuit according to claim 2, It is characterized in that The plurality of motor coils of the motor (12) include a first coil (121) and at least one second coil (122), the first coil (121) and the at least one second coil (122) being connected in series, one end of the inductor branch (20) being electrically connected between the first coil (121) and the first switch (k1), and the first switch (k1) being connected to the first coil (121).

6. The charge and discharge circuit according to claim 5, It is characterized in that There are multiple second coils (122), and the multiple second coils (122) are connected in parallel.

7. The charge and discharge circuit according to claim 1, It is characterized in that When the charge and discharge current of the charge and discharge circuit is greater than the charge and discharge current threshold, the charge and discharge circuit is in the first mode; When the charge and discharge current is less than or equal to the charge and discharge current threshold, the charge and discharge circuit is in the second mode.

8. The charge and discharge circuit according to claim 1, It is characterized in that The charging and discharging circuit further includes a fifth switch (k5); The first end of the fifth switch (k5) is used to be electrically connected to the second electrode of the first power source (30), and the second end of the fifth switch (k5) is used to be electrically connected to the second electrode (101b) of the charge and discharge port (101).

9. The charge and discharge circuit according to claim 1, It is characterized in that The charging and discharging circuit further includes a sixth switch (k6); The first end of the sixth switch (k6) is used to be electrically connected to the first electrode of the first power source (30), and the second end of the sixth switch (k6) is used to be electrically connected to the first electrode (101a) of the charge and discharge port (101).

10. A charging and discharging method, It is characterized in that For use in the charge and discharge circuit according to any one of claims 1 to 9, the method comprising: When the charge and discharge current of the charge and discharge circuit is greater than the charge and discharge current threshold, controlling the first switch of the charge and discharge circuit to be turned on, and controlling the second switch in the inductance branch of the charge and discharge circuit to be turned off; When the charge and discharge current is less than or equal to the charge and discharge current threshold, the first switch is controlled to be turned off, and the second switch is controlled to be turned on.

11. An electronic device, It is characterized in that The method comprises a processor, wherein the processor is connected to a memory, wherein the memory stores a computer program, and wherein the processor is configured to execute the computer program to implement the method of claim 10.

12. A charging and discharging system, It is characterized in that It comprises the charging and discharging circuit according to any one of claims 1 to 9 and the electronic device according to claim 11.

13. A vehicle, It is characterized in that The invention comprises the charging and discharging circuit according to any one of claims 1 to 9, or the electronic device according to claim 11, or the charging and discharging system according to claim 12.

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