Charging and discharging circuit, method and system, electronic apparatus and vehicle

Abstract

A charging and discharging circuit (100), method and system (2000), an electronic apparatus (1000), and a vehicle (3000). The charging and discharging circuit comprises a motor transformer module (10) and a first switch (k1). A first end of the first switch is connected to the motor transformer module, and a second end of the first switch is used for connecting to a charging and discharging port (101). The charging and discharging circuit further comprises at least one inductor branch (20), and the inductor branch comprises an inductive device (L2a) and a second switch (K2a) which are connected in series. A first end of the inductor branch is connected between the motor transformer module and the first switch, and a second end of the inductor branch is used for electrically connecting to the charging and discharging port. The charging and discharging port can be connected to the motor transformer module by means of the inductor branch, such that the energy loss of components in the motor transformer module is reduced, thereby improving charging and discharging efficiency.

Description

Charging and discharging circuit, method, system, electronic device, and vehicle

[0001] This application claims priority to Chinese Patent Application No. 202411060371.9, filed on August 5, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure belongs to the technical field of charging and discharging, and particularly relates to a charging and discharging circuit, method, system, electronic device, and vehicle. BACKGROUND

[0003] An electric vehicle (EV) is a vehicle that uses electric energy as a power source. A battery is provided in the electric vehicle, which can receive and store electric energy provided by a charging pile, and release the stored electric energy to drive the electric vehicle to travel during the travel of the electric vehicle. SUMMARY

[0004] The present disclosure provides a charging and discharging circuit, method, system, electronic device, and vehicle.

[0005] In a first aspect, a charging and discharging circuit is provided. The charging and discharging circuit includes a motor transformer module and a first switch. A first end of the first switch is connected to the motor transformer module, and a second end of the first switch is used to connect a charging and discharging port. The charging and discharging circuit further includes at least one inductor branch. The at least one inductor branch includes an inductive device and a second switch connected in series. A first end of the inductor branch is connected between the motor transformer module and the first switch, and a second end of the inductor branch is used to electrically connect the charging and discharging port.

[0006] In some embodiments, the motor transformer module includes an inverter and a motor. The first end of the first switch is connected to the motor, the motor is electrically connected to the inverter, and the first end of the inductor branch is connected between the motor and the first switch.

[0007] In some embodiments, the inverter includes a plurality of bridge arms, each of the plurality of bridge arms includes two power switch units. The motor includes a plurality of motor coils, each of the plurality of motor coils is connected to a midpoint of one of the plurality of bridge arms. The midpoint is a connection point of the two power switch units.

[0008] In some embodiments, a plurality of motor coils of the motor are connected to a neutral point of the motor, a first end of the inductor branch is electrically connected between the neutral point and the first switch, and the first switch is electrically connected to the neutral point.

[0009] In some embodiments, the plurality of motor coils of the motor includes a first coil and at least one second coil. The first coil is connected in series with the at least one second coil, and a first end of the inductance branch is electrically connected between the first coil and the first switch. The first switch is connected with the first coil.

[0010] In some embodiments, the at least one second coil includes a plurality of second coils, and the plurality of second coils are connected in parallel.

[0011] In some embodiments, the charge-discharge circuit includes a first mode. In the first mode, the first switch is turned on, and the second switch is turned off.

[0012] The charge-discharge circuit further includes a second mode, in which the first switch is turned off, and the second switch is turned on.

[0013] In some embodiments, when a charge-discharge current of the charge-discharge circuit is greater than a charge-discharge current threshold, the charge-discharge circuit is in the first mode.

[0014] When the charge-discharge current is less than or equal to the charge-discharge current threshold, the charge-discharge circuit is in the second mode.

[0015] In some embodiments, the at least one inductance branch includes a plurality of inductance branches, and the plurality of inductance branches are connected in parallel.

[0016] In some embodiments, in the first mode, the first switch is turned on, and the second switch of each inductance branch in the plurality of inductance branches is turned off.

[0017] In the second mode, the first switch is turned off. Among the plurality of inductance branches, the second switch of a target inductance branch matching the charge-discharge current of the charge-discharge circuit is turned on, and the second switch of other inductance branches other than the target inductance branch is turned off.

[0018] In some embodiments, the charge-discharge circuit further includes a fifth switch.

[0019] A first end of the fifth switch is configured to be electrically connected with a second electrode of the first power supply, and a second end of the fifth switch is configured to be electrically connected with a second electrode of the charge-discharge port.

[0020] In some embodiments, the charge-discharge circuit further includes a sixth switch.

[0021] A first end of the sixth switch is configured to be electrically connected with a first electrode of the first power supply, and a second end of the sixth switch is configured to be electrically connected with a first electrode of the charge-discharge port.

[0022] In a second aspect, a charging and discharging method is provided. The charging and discharging method is used in the charging and discharging circuit of the first aspect. The method comprises:

[0023] In a case where the charging and discharging current of the charging and discharging circuit is greater than the charging and discharging current threshold, the first switch of the charging and discharging circuit is controlled to be turned on, and the second switch in the inductor branch of the charging and discharging circuit is controlled to be turned off;

[0024] In a case where the charging and discharging current is less than or equal to the charging and discharging current threshold, the first switch is controlled to be turned off, and the second switch is controlled to be turned on.

[0025] In a third aspect, an electronic device is provided. The electronic device comprises a processor and a memory. The processor is connected with the memory, and the memory stores a computer program. The processor is configured to execute the computer program to implement the method according to the second aspect.

[0026] In a fourth aspect, a charging and discharging system is provided. The charging and discharging system comprises the charging and discharging circuit according to the first aspect and the electronic device according to the third aspect.

[0027] In a fifth aspect, a vehicle is provided. The vehicle comprises the charging and discharging circuit according to the first aspect, or comprises the electronic device according to the third aspect, or comprises the charging and discharging system according to the fourth aspect.

[0028] In some embodiments of the present disclosure, the charging and discharging port can be connected with the motor voltage conversion module through the inductor branch, so that the energy loss of components in the motor voltage conversion module is reduced, and the charging and discharging efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the related art, the drawings needed in the embodiment description will be briefly introduced as follows.

[0030] FIG. 1 is a structural diagram of a charging and discharging circuit according to some embodiments;

[0031] FIG. 2 is a structural diagram of another charging and discharging circuit according to some embodiments;

[0032] FIG. 3 is a partial structural diagram of a charging and discharging circuit according to some embodiments;

[0033] FIG. 4 is another partial structural diagram of a charging and discharging circuit according to some embodiments;

[0034] FIG. 5 is yet another partial structural diagram of a charging and discharging circuit according to some embodiments;

[0035] FIG. 6 is yet another partial structural diagram of a charging and discharging circuit according to some embodiments;

[0036] Figure 7 is a current loop schematic diagram of a boost charge first stage, according to some embodiments;

[0037] Figure 8 is a current loop schematic diagram of a boost charge second stage, according to some embodiments;

[0038] Figure 9 is a current loop schematic diagram of a buck discharge first stage, according to some embodiments;

[0039] Figure 10 is a current loop schematic diagram of a buck discharge second stage, according to some embodiments;

[0040] Figure 11 is a flowchart of a charge and discharge method, according to some embodiments;

[0041] Figure 12 is a charge flowchart of a charge and discharge circuit, according to some embodiments;

[0042] Figure 13 is a discharge flowchart of a charge and discharge circuit, according to some embodiments;

[0043] Figure 14 is a block diagram of an electronic device, according to some embodiments;

[0044] Figure 15 is a block diagram of a charge and discharge system, according to some embodiments;

[0045] Figure 16 is a block diagram of a vehicle, according to some embodiments;

[0046] Figure 17 is another block diagram of a vehicle, according to some embodiments;

[0047] Figure 18 is yet another block diagram of a vehicle, according to some embodiments.

[0048] Reference signs: 3000 - vehicle; 2000 - charge and discharge system; 1000 - electronic device; 100 - charge and discharge circuit; 10 - motor voltage conversion module; 11 - inverter; 12 - motor; 121 - first coil; 122 - second coil; 20 - inductance branch; 30 - first power supply; 40 - second power supply; k1 - first switch; 50 - load. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below in combination with the accompanying drawings in the embodiments of the present disclosure. However, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present disclosure.

[0050] The terms "first", "second", and the like in the description and claims of the present disclosure are used to distinguish similar objects, and are not used to describe a particular sequential or chronological order. It should be understood that the data thus used can be interchanged, where appropriate, so that the embodiments of the present disclosure can be carried out in other sequences than those illustrated or described herein, and the objects differentiated by "first", "second", and the like are generally of a kind, and are not limited in number. For example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally means that the objects before and after are in an "or" relationship.

[0051] In the related art, since the charging voltage output by the charging pile is less than the standard charging voltage of the battery of the electric vehicle, a voltage boosting circuit is used to raise the charging voltage to the standard charging voltage to charge the battery of the electric vehicle.

[0052] However, in the process of charging and discharging the battery of the electric vehicle, the energy loss of the components in the voltage boosting circuit is large, resulting in low charging and discharging efficiency.

[0053] Therefore, referring to FIG. 1, some embodiments of the present disclosure provide a charging and discharging circuit. The charging and discharging circuit 100 includes a motor transformer module 10 and a first switch k1. The first end of the first switch k1 is connected to the motor transformer module 10, and the second end of the first switch k1 is used to connect a charging and discharging port 101. The charging and discharging circuit further includes an inductive branch 20, which includes an inductive component and a second switch connected in series. The first end of the inductive branch 20 is connected between the motor transformer module 10 and the first switch k1, and the second end of the inductive branch 20 is used to electrically connect the charging and discharging port 101.

[0054] For example, referring to FIG. 2, in the case of charging using the charging and discharging circuit, the motor transformer module 10 is used to electrically connect a first power supply 30, and the charging and discharging port 101 is used to electrically connect a second power supply 40. Under the voltage boosting effect of the motor transformer module 10, the first power supply 30 is charged by the second power supply 40.

[0055] In the case of discharging using the charging and discharging circuit, the motor transformer module 10 is used to electrically connect the first power supply 30, and the charging and discharging port 101 is used to electrically connect a load 50 (see FIG. 9). Under the voltage lowering effect of the motor transformer module 10, the load 50 is powered by the first power supply 30.

[0056] It should be noted that the first power supply 30 can be a direct current power supply, such as a battery; and the second power supply 40 can be a direct current power supply, such as a charging pile.

[0057] Since the charging voltage output by the second power supply 40 is less than the charging voltage of the first power supply 30, the motor voltage conversion module 10 is used to raise the charging voltage output by the second power supply 40 to the charging voltage of the first power supply 30 to charge the first power supply 30.

[0058] The inductive device is matched with the charging and discharging current to avoid that the charging and discharging current is too large to cause damage to the inductive device.

[0059] In some embodiments, the first switch k1 can be a relay, the second switch can also be a relay, and the inductive device can be an inductor.

[0060] In some embodiments of the present disclosure, 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 turned off and the second switch is turned on, so that the motor voltage conversion module is turned on through the inductive device in the inductive branch and the charging and discharging port 101, and charging and discharging is realized through the charging and discharging port 101. In this process, due to the effect of the inductive device, the inductance is increased and the ripple current is reduced, so that the energy loss of the components in the motor voltage conversion module is reduced, and the charging and discharging efficiency is improved.

[0061] In some embodiments, referring to FIG. 3, the motor voltage conversion module 10 includes an inverter 11 and a motor 12. The first end of the first switch k1 is connected with the motor 12, the motor 12 is electrically connected with the inverter 11, and the first end of the inductive branch 20 is connected between the motor 12 and the first switch k1.

[0062] 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 with the first power supply 30, and the inverter 11 can be an inverter matched with the motor 12. For example, the inverter 11 can be a three-phase inverter matched with a three-phase motor, a five-phase inverter matched with a five-phase motor, or a six-phase inverter matched with a six-phase motor.

[0063] In some embodiments of the present disclosure, through the control of the inverter 11, the motor coil in the motor 12 is first charged, and then discharged through the motor coil of the motor 12 to raise the charging voltage output by the second power supply 40 to the charging voltage of the first power supply 30, thereby charging the first power supply 30.

[0064] In some embodiments, referring to FIG. 3, the inverter 11 includes a plurality of bridge arms, and each bridge arm includes two power switch units. The motor 12 includes a plurality of motor coils, and each motor coil is connected to the midpoint of one bridge arm, and the midpoint is the connection point of the two power switch units.

[0065] For example, each bridge arm includes two power switch units, a power switch unit (such as the third switch) of the upper bridge and a power switch unit (such as the fourth switch) of the lower bridge. The power switch unit of the upper bridge corresponds to the motor coil one by one, and the power switch unit of the lower bridge corresponds to the motor coil one by one; the second 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 first 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 output end of the motor transformer module 10.

[0066] The inverter 11 further includes a second capacitor C2, the first end of the second capacitor C2 is electrically connected to the first electrode of the first power supply 30, and the second end of the second capacitor C2 is electrically connected to the second electrode of the first power supply 30, and the second capacitor C2 is used for filtering.

[0067] 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 second power supply 40, 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 be MOS tubes, such as NMOS tubes or PMOS tubes. MOS tube is Metal-Oxide-Semiconductor Field-Effect Transistor, NMOS tube is Negative channel Metal Oxide Semiconductor Field-Effect Transistor, and PMOS tube is Positive channel Metal Oxide Semiconductor Field-Effect Transistor.

[0068] In other embodiments, the power switch unit can also be an Insulate-Gate Bipolar Transistor (IGBT) or a Gallium Nitride High Electron Mobility Transistor (GaN HEMT).

[0069] For example, with reference to FIG. 3, the charge-discharge circuit includes an inductive branch 20 and a first switch k1, the inductive branch 20 including an inductive device L2a and a second switch k2a. Also, the inverter 11 is a three-phase inverter and includes three upper bridge power switch units and three lower bridge power switch units, namely, the upper bridge power switch unit k3a, the upper bridge power switch unit k3b, the upper bridge power switch unit k3c, the lower bridge power switch unit k4a, the lower bridge power switch unit k4b, and the lower bridge power switch unit k4c. Each of the upper bridge power switch units and the lower bridge power switch units is an NMOS tube. The motor 12 is a three-phase motor 12 and includes three motor coils, namely, the motor coil L2, the motor coil L3, and the motor coil L4. The charge-discharge circuit further includes a fifth switch k5.

[0070] A first end of the inductive device L2a is electrically connected to a first end of the second switch k2a, and a second end of the inductive device L2a is electrically connected to a second end of the motor coil L2, a second end of the motor coil L3, and a second end of the motor coil L4, respectively. A second end of the second switch k2a is electrically connected to a first electrode of the second power supply 40. A 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, respectively, and a second end of the first switch k1 is electrically connected to the first electrode of the second power supply 40.

[0071] A drain of the upper bridge power switch unit k3a is electrically connected to a first end of the motor coil L4, and a source of the upper bridge power switch unit k3a is electrically connected to a positive pole (i.e., a first electrode) of the first power supply 30. A source of the lower bridge power switch unit k4a is electrically connected to the first end of the motor coil L4, and a drain of the lower bridge power switch unit k4a is electrically connected to a negative pole (i.e., a second electrode) of the second power supply 40 through the fifth switch k5.

[0072] A drain of the upper bridge power switch unit k3b is electrically connected to a first end of the motor coil L3, and a source of the upper bridge power switch unit k3b is electrically connected to the positive pole of the first power supply 30. A source of the lower bridge power switch unit k4b is electrically connected to the first end of the motor coil L3, and a drain of the lower bridge power switch unit k4b is electrically connected to the negative pole of the second power supply 40 through the fifth switch k5.

[0073] A drain of the upper bridge power switch unit k3c is electrically connected to a first end of the motor coil L2, and a source of the upper bridge power switch unit k3c is electrically connected to the positive pole of the first power supply 30. A source of the lower bridge power switch unit k4c is electrically connected to the first end of the motor coil L2, and a drain of the lower bridge power switch unit k4c is electrically connected to the negative pole of the second power supply 40 through the fifth switch k5.

[0074] In some embodiments of the present disclosure, the second power supply 40 charges the motor coil corresponding to the power switch unit of the lower bridge in the motor 12 by first turning on the power switch unit of the lower bridge and turning off the power switch unit of the upper bridge corresponding to the power switch unit of the lower bridge. Then, the charging voltage output by the second power supply 40 is raised to the charging voltage of the first power supply 30 by turning on the power switch unit of the upper bridge and turning off the power switch unit of the lower bridge corresponding to the power switch unit of the upper bridge, so as to charge the first power supply 30.

[0075] In some embodiments, the plurality of motor coils of the motor 12 are connected to a neutral point of the motor 12, and the first end of the inductance 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.

[0076] In some embodiments of the present disclosure, by connecting the inductance branch 20 in series with the motor coil, the inductance of the charge-discharge circuit is increased, the ripple current is reduced, the energy loss of the power switch unit of the inverter 11 is reduced, and the charge-discharge efficiency is improved.

[0077] In some embodiments, as shown in FIG. 4, the plurality of motor coils of the motor 12 include a first coil 121 and at least one second coil 122, and the first coil 121 and the at least one second coil 122 are connected in series. The first end of the inductance 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.

[0078] In some embodiments of the present disclosure, by connecting the inductance branch 20 in series with the first coil 121, the inductance is increased, the ripple current is reduced, the energy loss of the power switch unit of the inverter 11 is reduced, and the charge-discharge efficiency is improved.

[0079] In some embodiments, the at least one second coil 122 includes a plurality of second coils 122, and the plurality of second coils 122 are connected in parallel.

[0080] In some embodiments of the present disclosure, by controlling the inverter 11, the first coil 121 and the plurality of second coils 122 in the motor 12 are first charged, and then discharged through the plurality of second coils of the motor 12 to raise the charging voltage output by the second power supply 40 to the charging voltage of the first power supply 30, thereby charging the first power supply 30.

[0081] In some embodiments, the charge-discharge circuit includes a first mode. In the first mode, the first switch k1 is turned on and the second switch is turned off. The charge-discharge circuit further includes a second mode, in which the first switch k1 is turned off and the second switch is turned on.

[0082] In some embodiments of the present disclosure, by controlling the first switch k1 and the second switch, the total inductance of the charge-discharge circuit can be controlled. For example, the total inductance of the charge-discharge circuit in the first mode is smaller than the total inductance of the charge-discharge circuit in the second mode.

[0083] In some embodiments, when the charge-discharge current of the charge-discharge circuit is greater than the charge-discharge current threshold, the charge-discharge circuit is in the first mode; when the charge-discharge current is less than or equal to the charge-discharge current threshold, the charge-discharge circuit is in the second mode.

[0084] It should be noted that the charge-discharge current threshold is the maximum current value allowed to pass through the inductive device of the inductance branch 20. When the current of the inductive device is greater than the charge-discharge current threshold, the inductive device has the risk of being damaged.

[0085] In some embodiments, the number of inductance branches 20 is multiple, and the multiple inductance branches 20 are connected in parallel.

[0086] It should be noted that the charge-discharge current threshold is greater than or equal to the maximum current value allowed to pass through the inductive device of each inductance branch 20. For example, the inductance branch with the maximum current value allowed to pass through among the multiple inductance branches 20 is the threshold inductance branch, and the charge-discharge current threshold is equal to the maximum current value allowed to pass through the threshold inductance branch.

[0087] For example, referring to FIG. 5, the charge-discharge circuit includes two inductance branches 20 and a first switch k1. One inductance branch 20 includes an inductive device L2a and a second switch k2a, and the other inductance branch 20 includes an inductive device L2b and a second switch k2b. 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 output end of the motor voltage conversion module 10, and 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 inductive device L2b is electrically connected to the first end of the second switch k2b, the second end of the inductive device L2b is electrically connected to the output end of the motor voltage conversion module 10, and the second end of the second switch k2b 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 output end of the motor voltage conversion module 10, and the second end of the first switch k1 is electrically connected to the first electrode of the second power supply 40.

[0088] In some embodiments, in the first mode, the first switch k1 is turned on, and the second switch of each inductance branch 20 is turned off.

[0089] In the second mode, the first switch k1 is turned off; among the multiple inductance branches 20, the second switch of the target inductance branch matching the charge-discharge current of the charge-discharge circuit is turned on, and the second switch of the inductance branch other than the target inductance branch is turned off.

[0090] For example, the charge-discharge circuit includes two inductor branches 20 and a first switch k1. One inductor branch 20 includes an inductive device L2a and a second switch k2a, and the other inductor branch 20 includes an inductive device L2b and a second switch k2b. The maximum current value allowed to pass through the inductive device L2a is less than the maximum current value allowed to pass through the inductive device L2b. In the second mode, when the charge-discharge current is less than or equal to the maximum current value allowed to pass through the inductive device L2a, the inductor branch 20 to which the inductive device L2a belongs is the target inductor branch, the second switch k2a is turned on, and the second switch k2b and the first switch k1 are turned off; when the charge-discharge current is greater than the maximum current value allowed to pass through the inductive device L2a and less than or equal to the maximum current value allowed to pass through the inductive device L2b, the inductor branch 20 to which the inductive device L2b belongs is the target inductor branch, the second switch k2b is turned on, and the second switch k2a and the first switch k1 are turned off.

[0091] In some embodiments, in the second mode, the second switches of part of the inductor branches 20 can be turned on, or the second switches of all the inductor branches can be turned on. The number of inductor branches turned on and the inductor branches turned on can be determined according to the charging power demand and the maximum current value supported by the inductive devices of the inductor branches.

[0092] In any of the above embodiments of the present disclosure, the inductive device may, for example, be a coil.

[0093] In some embodiments of the present disclosure, since the first switch k1 is turned off when the charge-discharge current is less than or equal to the charge-discharge current threshold, the second switch of the target inductor branch is turned on, and the inductive device in the target inductor branch matches the charge-discharge current of the charge-discharge circuit, damage to the inductive device caused by the charge-discharge current exceeding the maximum current value allowed to pass through the inductive device is avoided; since the first switch k1 is turned on when the charge-discharge current is greater than the charge-discharge current threshold, the second switch of each inductor branch 20 is turned off, and damage to the inductive device of the inductor branch 20 is effectively avoided.

[0094] It should be noted that the first mode and the second mode of the charge-discharge circuit can be switched with each other.

[0095] In some embodiments, referring to FIGS. 3 and 5, the charge-discharge circuit further includes a fifth switch k5; the first end of the fifth switch k5 is electrically connected to the second electrode of the first power supply 30, and the second end of the fifth switch k5 is used to be electrically connected to the second electrode 101b of the charge-discharge port 101.

[0096] It should be noted that the charge-discharge circuit further comprises a first capacitor C1, a first end of the first capacitor C1 is electrically connected with the first electrode of the second power supply 40, and a second end of the first capacitor C1 is electrically connected with the first end of the fifth switch k5, and the first capacitor C1 is used for filtering.

[0097] For example, the fifth switch k5 can be a relay.

[0098] In some embodiments of the present disclosure, the fifth switch k5 is turned on to electrically connect the negative electrode of the second power supply 40 with the negative electrode of the first power supply 30, so as to charge the first power supply 30 by the second power supply 40.

[0099] In some embodiments, referring to FIG. 6, the charge-discharge circuit further comprises a sixth switch k6. A first end of the sixth switch k6 is used for electrically connecting with the first electrode of the first power supply 30, and a second end of the sixth switch k6 is used for electrically connecting with the first electrode 101a of the charge-discharge port 101.

[0100] For example, the sixth switch k6 can be a relay.

[0101] In some embodiments of the present disclosure, in the case that the charging voltage of the second power supply 40 is less than the charging voltage of the first power supply 30, the motor voltage conversion module 10 is used to increase the charging voltage of the second power supply 40 to charge the first power supply 30; in the case that 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. It should be noted that the charge-discharge circuit further comprises a third mode, which corresponds to the case that 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.

[0102] In some embodiments, referring to FIG. 7, the first end of the power switch unit of each upper bridge is electrically connected with the positive electrode of the first power supply 30, the second end of the power switch unit of each lower bridge is electrically connected with the negative electrode of the second power supply 40 through the fifth switch k5, the first electrode 101a of the charge-discharge port 101 is electrically connected with the positive electrode of the second power supply 40, and the second electrode 101b of the charge-discharge port 101 is electrically connected with the negative electrode of the second power supply 40.

[0103] In the first stage of the boost charging of the charge-discharge circuit, the charging current flows out from the positive electrode of the second power supply 40 along the e1 direction, and then flows along the e2 direction through the first switch k1 or the inductor branch 20. Then the charging current flows along the e3 direction through the motor coil of the motor 12, and then flows along the e4 direction through the power switch unit of the lower bridge, and then flows back to the negative electrode of the second power supply 40 along the e5 direction, so as to charge the motor coil.

[0104] Referring to FIG. 8, in the second stage of the boost charging of the charge-discharge circuit, the charging current flows out from the positive pole of the second power supply 40 in the f1 direction, and then flows through the first switch k1 or the inductor branch 20 in the f2 direction. Then the charging current flows through the motor coil of the motor 12 in the f3 direction, and then flows through the power switch unit of the upper bridge in the f4 direction, and then flows to the positive pole of the first power supply 30 in the f5 direction. After that, the charging current flows out from the negative pole of the first power supply 30 in the f6 direction, and then flows back to the negative pole of the second power supply 40 in the f7 direction through the fifth switch k5, so as to realize the voltage superposition through the second power supply 40 and the motor coil of the motor 12, and increase the charging voltage of the second power supply 40 to charge the first power supply 30.

[0105] In some embodiments, referring to FIG. 9, the first end of the power switch unit of each upper bridge is electrically connected with the positive pole of the first power supply 30, and the second end of the power switch unit of each lower bridge is electrically connected with the negative pole of the load 50 through the fifth switch k5. The first electrode 101a of the charge-discharge port 101 is electrically connected with the positive pole of the load 50, and the second electrode 101b of the charge-discharge port 101 is electrically connected with the negative pole of the load 50.

[0106] In the first stage of the boost charging of the charge-discharge circuit, the charging current flows out from the positive pole of the first power supply 30 in the g1 direction, and then flows through the power switch unit of the upper bridge in the g2 direction, and then flows through the motor coil of the motor 12 in the g3 direction, at this time, the discharging current charges the motor coil. Then the discharging current flows through the first switch k1 or the inductor branch 20 in the g4 direction, and then flows to the positive pole of the load 50 in the g5 direction. After that, the discharging current flows out from the negative pole of the load 50 in the g6 direction, and then flows back to the negative pole of the first power supply 30 in the g7 direction, so as to realize the voltage division of the output voltage of the first power supply 30 through the motor coil of the motor 12, and reduce the supply voltage to supply power to the load 50.

[0107] Referring to FIG. 10, in the second stage of the boost charging of the charge-discharge circuit, the charging current flows out from the motor coil of the motor 12 in the h1 direction, and then flows through the first switch k1 or the inductor branch 20 in the h2 direction, and then flows to the positive pole of the load 50 in the h3 direction. After that, the discharging current flows out from the negative pole of the load 50 in the h4 direction, and then flows back to the motor coil of the motor 12 in the h5 direction through the power switch unit of the lower bridge, so as to realize the discharging through the motor coil of the motor 12 to supply power to the load 50.

[0108] In some embodiments, the charge-discharge circuit further comprises a controller, which is configured to control the conduction and turn-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.

[0109] In summary, in some embodiments of the present disclosure, 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 k1 is turned off and the second switch is turned on, so that the motor transformer module 10 is connected to the charging and discharging port through the inductive device in the inductive branch 20, and charging and discharging is realized through the charging and discharging port. In this process, due to the effect of the inductive device, the inductance is increased and the ripple current is reduced, so that the energy loss of the components in the motor transformer module 10 is reduced, and the charging and discharging efficiency is improved.

[0110] Referring to FIG. 11, some embodiments of the present disclosure also provide a charging and discharging method for the foregoing charging and discharging circuit. The method comprises:

[0111] In step 101, when the charging and discharging current of the charging and discharging circuit is greater than the charging and discharging current threshold, the first switch of the charging and discharging circuit is turned on, and the second switch in the inductive branch of the charging and discharging circuit is turned off.

[0112] The implementation of this step is similar to the implementation process of the foregoing charging and discharging circuit, which will not be described here.

[0113] In step 102, when the charging and discharging current is less than or equal to the charging and discharging current threshold, the first switch is turned off and the second switch is turned on.

[0114] The implementation of this step is similar to the implementation process of the foregoing charging and discharging circuit, which will not be described here.

[0115] In some embodiments, referring to FIG. 12, the charging process of the charging and discharging circuit comprises the following steps X1 to X10:

[0116] In step X1, it is judged whether the charging voltage is greater than or equal to the standard charging voltage. If yes, step X2 is executed; if no, step X3 is executed.

[0117] That is, it is judged whether the charging voltage of the second power supply 40 is greater than or equal to the charging voltage of the first power supply 30.

[0118] In step X2, charging is performed in the third mode.

[0119] That is, in the case that 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 both turned off, so that the second power supply 40 directly charges the first power supply 30.

[0120] In step X3, it is judged whether the charging current is less than or equal to the charging current threshold. If yes, step X4 is executed; if no, step X7 is executed.

[0121] That is, in the case where the charging voltage of the second power supply 40 is less than the charging voltage of the first power supply 30, it is determined whether the charging current is less than or equal to the charging current threshold value.

[0122] In step X4, charging is performed in the second mode.

[0123] That is, in the case where the charging current is less than or equal to the charging current threshold value, the charge-discharge circuit charges in the second mode.

[0124] In step X5, it is determined whether the charging current is less than or equal to the charging current threshold value. If so, step X10 is executed; if not, step X6 is executed.

[0125] That is, when the charge-discharge circuit charges in the second mode, it is determined whether the charging current is less than or equal to the charging current threshold value.

[0126] In step X6, charging is switched to the first mode.

[0127] That is, in the case where the charging current is greater than the charging current threshold value, the charge-discharge circuit switches to charging in the first mode.

[0128] In step X7, charging is performed in the first mode.

[0129] That is, in the case where the charging current is greater than the charging current threshold value, the charge-discharge circuit charges in the first mode.

[0130] In step X8, it is determined whether the charging current is less than or equal to the charging current threshold value. If so, step X9 is executed; if not, step X10 is executed.

[0131] That is, when the charge-discharge circuit charges in the first mode, it is determined whether the charging current is less than or equal to the charging current threshold value.

[0132] In step X9, charging is switched to the second mode.

[0133] That is, in the case where the charging current is less than or equal to the charging current threshold value, the charge-discharge circuit switches to charging in the second mode.

[0134] In step X10, charging is continued.

[0135] That is, the charge-discharge circuit charges in the original mode, and the charging process is similar to the aforementioned implementation process of the charge-discharge circuit, and thus will not be described here. The charging current threshold value is equal to the charge-discharge current threshold value.

[0136] In some embodiments, referring to FIG. 13, the discharging process of the charge-discharge circuit includes the following steps Y1 to Y8:

[0137] In step Yl, it is determined whether the discharge current is less than or equal to the discharge current threshold value. If so, step Y2 is executed; if not, step Y5 is executed.

[0138] In step Y2, discharging is performed in the second mode.

[0139] That is, in the case where the discharge current is less than or equal to the discharge current threshold value, the charge-discharge circuit discharges in the second mode.

[0140] In step Y3, it is determined whether the discharge current is less than or equal to the discharge current threshold value. If so, step Y8 is executed; if not, step Y4 is executed.

[0141] That is, when the charge-discharge circuit discharges in the second mode, it is determined whether the discharge current is less than or equal to the discharge current threshold value.

[0142] In step Y4, discharging is switched to the first mode.

[0143] That is, in the case where the discharge current is greater than the discharge current threshold value, the charge-discharge circuit discharges in the first mode.

[0144] In step Y5, discharging is performed in the first mode.

[0145] That is, in the case where the discharge current is greater than the discharge current threshold value, the charge-discharge circuit discharges in the first mode.

[0146] In step Y6, it is determined whether the discharge current is less than or equal to the discharge current threshold value. If so, step Y7 is executed; if not, step Y8 is executed.

[0147] That is, when the charge-discharge circuit discharges in the first mode, it is determined whether the discharge current is less than or equal to the discharge current threshold value.

[0148] In step Y7, discharging is switched to the second mode.

[0149] That is, in the case where the discharge current is less than or equal to the discharge current threshold value, the charge-discharge circuit discharges in the second mode.

[0150] In step Y8, discharging is continued.

[0151] That is, the charge-discharge circuit discharges in the original mode, and the discharging process is similar to the aforementioned implementation process of the charge-discharge circuit, and thus will not be described here. The discharge current threshold value is equal to the charge-discharge current threshold value.

[0152] Some embodiments of the present disclosure further provide an electronic device 1000. Referring to FIG. 14, the electronic device 1000 includes a processor 1001 and a memory 1002. The processor 1001 is connected with the memory 1002, and the memory 1002 stores a computer program. The processor 1001 is configured to execute the computer program to implement the foregoing charging and discharging method, and the implementation process is similar to the foregoing, which will not be repeated here.

[0153] The electronic device 1000 of some embodiments of the present disclosure can be deployed in the controller of the foregoing embodiments.

[0154] Some embodiments of the present disclosure further provide a charging and discharging system 2000. Referring to FIG. 15, the charging and discharging system 2000 includes the foregoing charging and discharging circuit 100 and the foregoing electronic device 1000, and the implementation process is similar to the foregoing, which will not be repeated here.

[0155] Some embodiments of the present disclosure further provide a vehicle 3000. Referring to FIGS. 16-18, the vehicle 3000 includes the foregoing charging and discharging circuit 100, or includes the foregoing electronic device 1000, or includes the foregoing charging and discharging system 2000, and the implementation process is similar to the foregoing, which will not be repeated here.

[0156] In order to improve efficiency and driving range, more and more vehicles are designed to have a battery with a charging voltage of 800 volts or higher, while most of the current fast charging piles can only charge a battery with a charging voltage of 200-500 volts, so a boost converter is needed to boost the voltage provided by the charging pile to charge the battery of the vehicle.

[0157] In the related art, a large-capacity boost converter that boosts 400 volts to 800 volts or higher has large weight and volume, and is high in cost.

[0158] In some embodiments of the present disclosure, the external charging power provided to the neutral point of the motor 12 is converted by the inverter, and then the converted power is provided to the battery to charge the battery. In this way, not only is the boost charging achieved, but also the cost is relatively low.

[0159] In summary, in some embodiments of the present disclosure, 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 k1 is turned off and the second switch is turned on, so that the motor transformer module 10 is connected with the charging and discharging port through the inductive device in the inductive branch 20, and the charging and discharging is realized through the charging and discharging port. In this process, the inductance is increased due to the effect of the inductive device, and the ripple current is reduced, so that the energy loss of the components in the motor transformer module 10 is reduced, and the charging and discharging efficiency is improved.

[0160] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a", "comprising", or "includes a", does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus of the present embodiments are not limited by the order of the steps or the order of the components, as described in the examples, but can include performing the steps in different order, or performing the steps concurrently, or in reverse order, or omitting one or more steps, or adding one or more steps, or adding, omitting, or combining various features of the examples described. Also, features described in relation to one example can be combined in other examples.

[0161] The above describes the embodiments of the present disclosure in conjunction with the drawings, but the present disclosure is not limited to the specific embodiments described above, which are merely illustrative and not restrictive, and those of ordinary skill in the art can make many forms under the inspiration of the present disclosure without departing from the purpose of the present disclosure and the scope protected by the claims.

Claims

1. A charge and discharge circuit (100) comprising: The motor voltage conversion module (10) and a first switch (k1), a first end of the first switch (k1) is connected with the motor voltage conversion module (10), a second end of the first switch (k1) is used for connecting a charge-discharge port (101), the charge-discharge circuit (100) further includes at least one inductor branch (20), the at least one inductor branch (20) includes an inductive device and a second switch connected in series, a first end of the inductor branch (20) is connected between the motor voltage conversion module (10) and the first switch (k1), a second end of the inductor branch (20) is used for electrically connecting the charge-discharge port (101).

2. The charge and discharge circuit (100) according to claim 1, wherein The motor voltage conversion module (10) includes an inverter (11) and a motor (12), a first end of the first switch (k1) is connected with the motor (12), the motor (12) is electrically connected with the inverter (11), a first end of the inductor branch (20) is connected between the motor (12) and the first switch (k1).

3. The charge and discharge circuit (100) according to claim 2, wherein The inverter (11) includes a plurality of bridge arms, each of the plurality of bridge arms includes two power switch units, the motor (12) includes a plurality of motor coils, each of the plurality of motor coils is connected to a midpoint of one of the plurality of bridge arms, and the midpoint is a connection point of the two power switch units.

4. The charge and discharge circuit (100) according to claim 3, wherein The plurality of motor coils of the motor (12) are connected to a neutral point of the motor (12), the first 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 with the neutral point.

5. The charge and discharge circuit (100) according to claim 3 or 4, wherein 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) is connected in series with the at least one second coil (122), the first 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 with the first coil (121).

6. The charge and discharge circuit (100) according to claim 5, wherein The at least one second coil (122) includes a plurality of second coils (122), and the plurality of second coils (122) are connected in parallel.

7. The charge and discharge circuit (100) according to any one of claims 1 to 6, wherein The charge-discharge circuit (100) includes a first mode, in the first mode, the first switch (k1) is turned on, and the second switch is turned off; The charge-discharge circuit (100) further includes a second mode, in the second mode, the first switch (k1) is turned off, and the second switch is turned on.

8. The charge and discharge circuit (100) according to claim 7, wherein In a case where a charge-discharge current of the charge-discharge circuit (100) is greater than a charge-discharge current threshold, the charge-discharge circuit (100) is in the first mode; In a case where the charge-discharge current is less than or equal to the charge-discharge current threshold, the charge-discharge circuit (100) is in the second mode.

9. The charge and discharge circuit (100) according to claim 7 or 8, wherein The at least one inductor branch (20) includes a plurality of inductor branches (20), and the plurality of inductor branches (20) are connected in parallel.

10. The charge and discharge circuit (100) according to claim 9, wherein In the first mode, the first switch (k1) is turned on, and the second switch of each of the plurality of inductor branches (20) is turned off; In the second mode, the first switch (k1) is turned off; In the plurality of inductor branches (20), the second switch of a target inductor branch matching the charge-discharge current of the charge-discharge circuit (100) is turned on, and the second switch of other inductor branches other than the target inductor branch is turned off.

11. The charge-discharge circuit (100) according to any one of claims 1 to 10, further comprising a fifth switch (k5); The first end of the fifth switch (k5) is configured to be electrically connected to the second electrode of the first power supply (30), and the second end of the fifth switch (k5) is configured to be electrically connected to the second electrode (101b) of the charge-discharge port (101).

12. The charge-discharge circuit (100) according to any one of claims 1 to 11, further comprising a sixth switch (k6); The first end of the sixth switch (k6) is configured to be electrically connected to the first electrode of the first power supply (30), and the second end of the sixth switch (k6) is configured to be electrically connected to the first electrode (101a) of the charge-discharge port (101).

13. A charging and discharging method for the charging and discharging circuit (100) according to any one of claims 1 to 12, wherein The method comprises: In a case where the charge-discharge current of the charge-discharge circuit (100) is greater than a charge-discharge current threshold, the first switch (k1) of the charge-discharge circuit (100) is controlled to be turned on, and the second switch in the inductor branch (20) of the charge-discharge circuit (100) is controlled to be turned off; In a case where the charge-discharge current is less than or equal to the charge-discharge current threshold, the first switch (k1) is controlled to be turned off, and the second switch is controlled to be turned on.

14. An electronic device (1000) comprising a processor (1001) and a memory (1002), the processor (1001) being connected to the memory (1002), the memory (1002) storing a computer program, and the processor (1001) being configured to execute the computer program to implement the method according to claim 13.

15. A charge-discharge system (2000) comprising the charge-discharge circuit (100) according to any one of claims 1 to 12 and the electronic device (1000) according to claim 14.

16. A vehicle (3000) satisfying one of the following: The vehicle (3000) comprises the charge-discharge circuit (100) according to any one of claims 1 to 12; The vehicle (3000) comprises the electronic device (1000) according to claim 14; and The vehicle (3000) comprises the charge-discharge system (2000) according to claim 15.

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