Drive circuit, charge / discharge circuit, drive system, charge / discharge system, and vehicle

Abstract

The embodiment of the invention provides a driving circuit, a charging and discharging circuit, a driving system, a charging and discharging system and a vehicle, relates to the technical field of vehicles, and can reduce the harmonic content and switching loss of the driving circuit and improve the response speed and sensitivity of the driving circuit. The driving circuit comprises a bus capacitor branch, a clamping sub-circuit and a first conversion sub-circuit. The bus capacitor branch is suitable for being connected between a first pole and a second pole of the battery pack; the first conversion sub-circuit is suitable for being connected with a driving motor; the first conversion sub-circuit is configured to convert direct current into alternating current so as to provide the alternating current for the driving motor; the first end and the second end of the clamping sub-circuit are respectively connected to the midpoint of the bus capacitor branch, and the third end of the clamping sub-circuit is connected with the first conversion sub-circuit; wherein power devices in the clamping sub-circuit and the first conversion sub-circuit are different.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a drive circuit, a charge-discharge circuit, a drive system, a charge-discharge system, and a vehicle. Background Art

[0002] The electric drive system of electric vehicles typically includes a three-level inverter topology. Compared to the traditional two-level topology, the three-level inverter topology adds an intermediate level, allowing the output voltage to be divided into positive, zero, and negative levels. This design effectively reduces the harmonic content of the output voltage and reduces switching losses.

[0003] In a three-level inverter topology, three voltage levels can be generated by two capacitors connected in series. That is, the three-level inverter topology includes two capacitors connected in series, and the connection endpoints of the two capacitors are the clamping midpoint. After the DC bus voltage is divided by the two capacitors in series, a midpoint voltage, that is, a zero-level voltage, can be formed at the clamping midpoint, thereby clamping the output voltage at three levels: positive level, negative level, and zero level.

[0004] When the potential at the clamping midpoint shifts or fluctuates, the two capacitors will experience uneven voltage distribution, which can damage one capacitor due to excessive voltage. It can also introduce low-order harmonics, degrading power quality. Therefore, ensuring voltage balance at the clamping midpoint is crucial. Summary of the Invention

[0005] The purpose of this application is to provide a drive circuit, a charge-discharge circuit, a drive system, a charge-discharge system and a vehicle, aiming to solve the problem of how to reduce the harmonic content and switching loss of the drive circuit and improve the response speed and sensitivity of the drive circuit.

[0006] In a first aspect, a drive circuit is provided, comprising a bus capacitor branch, a clamping subcircuit, and a first conversion subcircuit. The bus capacitor branch is adapted to be connected between a first terminal and a second terminal of a battery pack; the first conversion subcircuit is adapted to be connected to a drive motor; the first conversion subcircuit is configured to convert direct current (DC) power to alternating current (AC) power for supply to the drive motor; a first end and a second end of the clamping subcircuit are respectively connected to a midpoint of the bus capacitor branch, and a third end of the clamping subcircuit is connected to the first conversion subcircuit; the power devices in the clamping subcircuit and the first conversion subcircuit are different.

[0007] The beneficial effects of the present application are: the voltage on the DC bus is clamped at three levels: positive, zero, and negative through the bus capacitor branch, and the above three levels are input into the first conversion sub-circuit, thereby realizing the access of the three levels of the first conversion sub-circuit; by controlling the on and off of multiple power devices in the first conversion sub-circuit, the level and frequency of the DC power input to the first conversion sub-circuit can be changed, thereby generating three-level AC power from the three-level DC power input to the first conversion sub-circuit. The waveform of the three-level AC power is closer to a sine wave, which can effectively reduce the harmonic content and optimize the electromagnetic interference performance; at the same time, the voltage borne by each power device in the first conversion sub-circuit is only half of the DC bus voltage, which can effectively reduce the switching loss of the power device of the first conversion sub-circuit, improve the reliability and service life of the power device, and improve the NEDC (New European Driving Cycle) operating efficiency of the electric vehicle.

[0008] At the same time, the first end and the second end of the clamping sub-circuit are both connected to the midpoint of the bus capacitor branch. The current output from the midpoint of the bus capacitor branch can be input into the clamping sub-circuit through the first end and the second end of the clamping sub-circuit. The multiple power devices in the clamping sub-circuit can be connected in parallel to the midpoint of the bus capacitor branch. At this time, the current output from the midpoint of the bus capacitor branch can enter the clamping sub-circuit through two lines. The current conduction capacity of the clamping sub-circuit is improved, and the clamping sub-circuit can receive more current. Therefore, the power devices in the clamping sub-circuit and the first conversion sub-circuit can be different. The power devices in the clamping sub-circuit can adopt power devices with a small current rating. A smaller current flowing through the power devices in the clamping sub-circuit can meet the first conversion sub-circuit's demand for large current. That is to say, multiple power devices in parallel can be used to meet the first conversion sub-circuit's demand for large current, thereby improving the response speed and sensitivity of the drive circuit.

[0009] In some embodiments, the clamping sub-circuit includes multiple first bridge arms, the first ends of the multiple first bridge arms are connected to the first end of the clamping sub-circuit; the second ends of the multiple first bridge arms are connected to the second end of the clamping sub-circuit; and the midpoints of the multiple first bridge arms serve as the third ends of the clamping sub-circuit.

[0010] In some embodiments, the first bridge arm includes a first power device and a second power device, the first end of the first power device serves as the first end of the first bridge arm, the second end of the first power device is connected to the first end of the second power device, and the second end of the second power device serves as the second end of the first bridge arm; the connection endpoints of the first power device and the second power device serve as the midpoint of the first bridge arm.

[0011] In some embodiments, the first power device and the second power device each comprise a bidirectional power device.

[0012] In some embodiments, the first power device and the second power device each include a first switching transistor and a second switching transistor. The first end of the first switching transistor is connected to the first end of the second switching transistor, the second end of the first switching transistor serves as the first end of the first power device or the first end of the second power device, and the second end of the second switching transistor serves as the second end of the first power device or the second end of the second power device.

[0013] In some embodiments, the first switch tube and the second switch tube include one of a Si IGBT, a Si MOSFET, a SiC MOSFET, and a GaN HEMT.

[0014] In some embodiments, the drive circuit also includes a first switch subcircuit, a first end of the first switch subcircuit is connected to the first ends of multiple first bridge arms; a second end of the first switch subcircuit is connected to the second ends of multiple first bridge arms; a third end of the first switch subcircuit is connected to the midpoint of the bus capacitor branch; the first switch subcircuit is configured to be turned on when the battery pack discharges the drive motor; and to be turned off when the battery pack is charging.

[0015] In some embodiments, the first switch subcircuit includes a first switch and a second switch, and the first ends of multiple first bridge arms are connected to the midpoint of the bus capacitor branch through the first switch; the second ends of multiple first bridge arms are connected to the midpoint of the bus capacitor branch through the second switch.

[0016] In some embodiments, the first conversion sub-circuit includes multiple second bridge arms, the first ends of the multiple second bridge arms are connected to the first pole of the battery pack; the second ends of the multiple second bridge arms are connected to the second pole of the battery pack; the midpoints of the multiple second bridge arms are respectively connected to the midpoints of the multiple first bridge arms, and the midpoints of the multiple second bridge arms are also connected to the drive motor.

[0017] In some embodiments, the second bridge arm includes a third power device and a fourth power device, the first end of the third power device serves as the first end of the second bridge arm, the second end of the third power device is connected to the first end of the fourth power device, and the second end of the fourth power device serves as the second end of the second bridge arm; the connection endpoints of the third power device and the fourth power device serve as the midpoint of the second bridge arm.

[0018] In some embodiments, the drive circuit also includes a second switch subcircuit, wherein the first end of the second switch subcircuit is connected to the midpoint of multiple first bridge arms; the second end of the second switch subcircuit is connected to the midpoint of multiple second bridge arms; the second switch subcircuit is configured to be turned on when the battery pack discharges the drive motor; and to be turned off when the battery pack is charging.

[0019] In some embodiments, the second switch subcircuit includes a plurality of third switches, and the midpoint of the first bridge arm is connected to the midpoint of the second bridge arm through the third switches.

[0020] In some embodiments, a current level of the power device in the clamping sub-circuit is smaller than a current level of the power device in the first conversion sub-circuit.

[0021] In some embodiments, the drive circuit also includes a third conversion sub-circuit, wherein the first end of the third conversion sub-circuit is connected to the first pole of the battery pack; the second end of the third conversion sub-circuit is connected to the second pole of the battery pack; the third end of the third conversion sub-circuit is configured to be connected to the generator; the third conversion sub-circuit is configured to convert the AC power output by the generator into DC power to charge the battery pack.

[0022] In some embodiments, the third conversion sub-circuit includes multiple fourth bridge arms, the first ends of the multiple fourth bridge arms are connected to the first end of the third conversion sub-circuit; the second ends of the multiple fourth bridge arms are connected to the second end of the third conversion sub-circuit; and the midpoints of the multiple fourth bridge arms serve as the third ends of the third conversion sub-circuit.

[0023] In some embodiments, the fourth bridge arm includes a seventh power device and an eighth power device, the first end of the seventh power device serves as the first end of the fourth bridge arm, the second end of the seventh power device is connected to the first end of the eighth power device, and the second end of the eighth power device serves as the second end of the fourth bridge arm; the connection endpoints of the seventh power device and the eighth power device serve as the midpoint of the fourth bridge arm.

[0024] In some embodiments, a current level of the power device in the clamping sub-circuit is smaller than a current level of the power device in the third conversion sub-circuit.

[0025] In a second aspect, a charging and discharging circuit is provided, which includes a driving circuit, a charging port and a rectifier circuit as described in some of the above embodiments; the charging port is connected to the third end of the clamping sub-circuit; the rectifier circuit is connected to the first end and the second end of the clamping sub-circuit, and the rectifier circuit is suitable for connecting to a battery pack; the rectifier circuit is configured to convert alternating current into direct current to charge the battery pack.

[0026] In some embodiments, the clamping subcircuit includes a plurality of first bridge arms; the charging port includes a plurality of first ports, and the plurality of first ports are respectively connected to midpoints of the plurality of first bridge arms.

[0027] In some embodiments, the rectifier sub-circuit includes an isolation transformer, a first end of the isolation transformer is connected to a first end of the clamping sub-circuit, and a second end of the isolation transformer is connected to a second end of the clamping sub-circuit.

[0028] In some embodiments, the rectifier subcircuit also includes a second conversion subcircuit, the first end of the second conversion subcircuit is connected to the first pole of the battery pack; the second end of the second conversion subcircuit is connected to the second pole of the battery pack; and the third end of the second conversion subcircuit is connected to the third and fourth ends of the isolation transformer.

[0029] In some embodiments, the second conversion sub-circuit includes two third bridge arms, the first end of the third bridge arm is connected to the first end of the second conversion sub-circuit, and the second end of the third bridge arm is connected to the second end of the second conversion sub-circuit; the midpoints of the two third bridge arms serve as the third ends of the second conversion sub-circuit, and the midpoints of the two third bridge arms are connected to the third end and the fourth end of the isolation transformer, respectively.

[0030] In some embodiments, the third bridge arm includes a fifth power device and a sixth power device, the first end of the fifth power device serves as the first end of the third bridge arm, the second end of the fifth power device is connected to the first end of the sixth power device, and the second end of the sixth power device serves as the second end of the third bridge arm; the connection endpoints of the fifth power device and the sixth power device serve as the midpoint of the third bridge arm.

[0031] In some embodiments, the clamping subcircuit includes multiple first bridge arms; the charge and discharge circuit also includes a third switch subcircuit, the first end of the third switch subcircuit is connected to the first end and the second end of the multiple first bridge arms, and the second end of the third switch subcircuit is connected to the first end and the second end of the isolation transformer; the third switch subcircuit is configured to be cut off when the battery pack discharges the drive motor; and to be turned on when charging the battery pack.

[0032] In some embodiments, the third switch subcircuit includes a fourth switch and a fifth switch, the first end of the isolation transformer is connected to the first ends of the multiple first bridge arms through the fourth switch; the second end of the isolation transformer is connected to the second ends of the multiple first bridge arms through the fifth switch.

[0033] In some embodiments, the charge and discharge circuit also includes a fourth switch subcircuit, a first end of the fourth switch subcircuit is connected to the charging port, and a second end of the fourth switch subcircuit is connected to the midpoint of multiple first bridge arms; the fourth switch subcircuit is configured to be cut off when the battery pack discharges the drive motor; and to be turned on when charging the battery pack.

[0034] In some embodiments, the fourth switch subcircuit includes a plurality of sixth switches, and the first port of the charging port is connected to the midpoint of the first bridge arm through the sixth switch.

[0035] In some embodiments, the rectifier subcircuit further includes a first capacitor connected between the first pole and the second pole of the battery pack and also connected between the first end and the second end of the second conversion subcircuit.

[0036] In some embodiments, the charge and discharge circuit further includes a filter, a first end of the filter is connected to the charging port, and a second end of the filter is connected to a third end of the clamping sub-circuit.

[0037] In some embodiments, a current level of the power device in the clamping sub-circuit is smaller than a current level of the power device in the second conversion sub-circuit.

[0038] In a third aspect, a drive system is provided, which includes a battery pack, a drive circuit connected to the battery pack as described in some of the above embodiments, and a drive motor connected to the drive circuit.

[0039] In some embodiments, the driving system further includes a controller connected to the driving circuit. The controller is configured to sample operating data of the driving circuit and control the operation of the driving circuit according to the sampling result.

[0040] In some embodiments, when the battery pack discharges the drive motor, the controller selects to adopt the three-level vector modulation mode or the partial vector modulation mode according to the sampling result.

[0041] In a fourth aspect, a charging and discharging system is provided, which includes a battery pack, a charging and discharging circuit connected to the battery pack as described in some of the above embodiments, and a drive motor connected to the charging and discharging circuit.

[0042] In a fifth aspect, a vehicle is provided, which includes the driving circuit as described in some of the above embodiments, or includes the charging and discharging circuit as described in some of the above embodiments, or includes the driving system as described in some of the above embodiments, or includes the charging and discharging system as described in some of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0044] Figure 1 A charging and discharging circuit diagram of some embodiments of the present disclosure;

[0045] Figure 2 is another charging and discharging circuit diagram of some embodiments of the present disclosure;

[0046] Figure 3 is another charging and discharging circuit diagram of some embodiments of the present disclosure;

[0047] Figure 4A structural diagram of a first power device or a second power device according to some embodiments of the present disclosure;

[0048] Figure 5 This is a flow chart of an operating mode of a charging and discharging system according to some embodiments of the present disclosure;

[0049] Figure 6A A charging principle diagram of some embodiments of the present disclosure;

[0050] Figure 6B A charge and discharge circuit diagram in a charging operation mode according to some embodiments of the present disclosure;

[0051] Figure 7A A discharge principle diagram of some embodiments of the present disclosure;

[0052] Figure 7B A charge and discharge circuit diagram in a discharge operation mode according to some embodiments of the present disclosure;

[0053] Figure 8 A vector pulse width modulation strategy diagram of some embodiments of the present disclosure;

[0054] Figure 9 A control strategy diagram of a charging and discharging system according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0055] In the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first," "second," or "third" may explicitly or implicitly include one or more of the features.

[0056] In the embodiments of the present application, the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or apparatus.

[0057] Figure 1 、 Figure 2 、 Figure 3 1 shows a circuit diagram of a charge and discharge circuit 1000 according to some embodiments of the present disclosure, wherein: Figure 2 and Figure 3 The circuit structures shown are the same. In order to more clearly show the specific structure of the clamping sub-circuit 20 and its related connection relationship, Figure 3 The clamping sub-circuit 20 is placed between Figure 2 in different locations.

[0058] In some embodiments, the present disclosure provides a driving circuit 900, such as Figure 1 、 Figure 2 、 Figure 3 As shown, the drive circuit 900 is connected between the battery pack 2000 and the drive motor 3000; the drive circuit 900 includes a busbar capacitor branch 10, a clamping subcircuit 20, and a first conversion subcircuit 30. The busbar capacitor branch 10 is connected between the first pole 2001 and the second pole 2002 of the battery pack 2000; the first conversion subcircuit 30 is connected to the drive motor 3000, and the first conversion subcircuit 30 is configured to convert direct current into alternating current and provide the alternating current to the drive motor 3000; the first end 21 and the second end 22 of the clamping subcircuit 20 are respectively connected to the midpoint 13 of the busbar capacitor branch 10, and the third end 23 of the clamping subcircuit 20 is connected to the first conversion subcircuit 30; wherein, the power devices in the clamping subcircuit 20 and the first conversion subcircuit 30 are different.

[0059] For example, the driving circuit 900 is a discharge circuit of the vehicle charging and discharging circuit 1000. The driving circuit 900 can be applied to a vehicle (electric vehicle). Figure 1 、 Figure 2 、 Figure 3 As shown, the drive circuit 900 can be connected between the battery pack 2000 and the drive motor 3000; the drive circuit 900 can convert the direct current output by the battery pack 2000 of the electric vehicle during discharge into the alternating current required for the operation of the drive motor 3000, thereby enabling the drive motor 3000 to obtain power and operate.

[0060] For example, Figure 1 、 Figure 2 、 Figure 3 As shown, the driving circuit 900 may include a busbar capacitor branch 10, which is connected between a first electrode 2001 and a second electrode 2002 of the battery pack 2000. For example, a first end 11 of the busbar capacitor branch 10 is connected to the first electrode 2001 of the battery pack 2000, and a second end 12 of the busbar capacitor branch 10 is connected to the second electrode 2002 of the battery pack 2000.

[0061] For example, Figure 2 、 Figure 3As shown, the bus capacitor branch 10 may include a first bus capacitor C1 and a second bus capacitor C2, and the first bus capacitor C1 and the second bus capacitor C2 are connected in series between the first pole 2001 and the second pole 2002 of the battery pack 2000, the first end C1-1 of the first bus capacitor C1 can serve as the first end 11 of the bus capacitor branch 10, the second end C2-2 of the second bus capacitor C2 can serve as the second end 12 of the bus capacitor branch 10, the connection endpoint of the second end C1-2 of the first bus capacitor C1 and the first end C2-1 of the second bus capacitor C2 can serve as the midpoint 13 of the bus capacitor branch 10, and the midpoint 13 of the bus capacitor branch 10 can be the third end of the bus capacitor branch 10.

[0062] For example, Figure 1 、 Figure 2 、 Figure 3 As shown, the drive circuit 900 may further include a clamping sub-circuit 20, wherein the first end 21 and the second end 22 of the clamping sub-circuit 20 are respectively connected to the midpoint 13 of the bus capacitor branch 10, that is, the first end 21 and the second end 22 of the clamping sub-circuit 20 are both connected to the third end of the bus capacitor branch 10. The clamping sub-circuit 20 can be used to stabilize the voltage at the midpoint 13 of the bus capacitor branch 10 when the battery pack 2000 discharges the drive motor 3000, thereby making the voltage of the first bus capacitor C1 and the second bus capacitor C2 uniform, thereby preventing the first bus capacitor C1 or the second bus capacitor C2 from being damaged by excessive voltage, and at the same time, avoiding the voltage fluctuation at the midpoint 13 of the bus capacitor branch 10 and introducing low-order harmonics to reduce the power quality.

[0063] For example, Figure 1 、 Figure 2 、 Figure 3 As shown, the drive circuit 900 may further include a first conversion sub-circuit 30, wherein the first end 31 of the first conversion sub-circuit 30 is connected to the first pole 2001 of the battery pack 2000, and is also connected to the first end 11 of the bus capacitor branch 10; the second end 32 of the first conversion sub-circuit 30 is connected to the second pole 2002 of the battery pack 2000, and is also connected to the second end 12 of the bus capacitor branch 10; the third end 33 of the first conversion sub-circuit 30 is connected to the third end 23 of the clamping sub-circuit 20, and the third end 33 of the first conversion sub-circuit 30 is also connected to the drive motor 3000. The first conversion sub-circuit 30 can be used to convert direct current into alternating current and provide the alternating current to the drive motor 3000.

[0064] Therefore, the battery pack 2000 , the drive motor 3000 , and the bus capacitor branch 10 , the clamping sub-circuit 20 , and the first conversion sub-circuit 30 of the drive circuit 900 form a three-level discharge circuit.

[0065] Specifically, the bus capacitor branch 10 divides the voltage discharged from the battery pack 2000 to the DC bus into multiple levels. For example, the first bus capacitor C1 and the second bus capacitor C2 in the bus capacitor branch 10 can clamp the voltage on the DC bus at three levels: positive level, zero level, and negative level. In order to ensure the voltage balance at the third end of the bus capacitor branch 10 (the midpoint 13 of the bus capacitor branch 10) and to ensure the stable operation of the drive circuit 900, a clamping sub-circuit 20 can be connected to the midpoint 13 of the bus capacitor branch 10. The clamping sub-circuit 20 can, for example, include multiple power devices. By controlling the on and off of the multiple power devices, the voltage level of the midpoint 13 of the bus capacitor branch 10 approaches zero, thereby achieving voltage balance at the midpoint 13 of the bus capacitor branch 10. The first end 31 of the first conversion sub-circuit 30 is connected to the first pole 2001 of the battery pack 2000, the second end 32 of the first conversion sub-circuit 30 is connected to the second pole 2002 of the battery pack 2000, and the third end 33 of the first conversion sub-circuit 30 is connected to the third end 23 of the clamping sub-circuit 20, so that the first conversion sub-circuit 30 can access three levels. The first conversion sub-circuit 30 may include, for example, multiple power devices. By controlling the on and off of the multiple power devices, the three levels of direct current input to the first conversion sub-circuit 30 can be generated into three-level alternating current. The waveform of the three-level alternating current is closer to a sine wave, which can effectively reduce the harmonic content; the third end 33 of the first conversion sub-circuit 30 is also connected to the drive motor 3000. The first conversion sub-circuit 30 inputs the converted alternating current into the drive motor 3000, thereby causing the drive motor 3000 to start running.

[0066] Exemplarily, the voltage on the DC bus is clamped at three levels: positive, zero, and negative through the bus capacitor branch 10, and the above three levels are input into the first conversion sub-circuit 30, thereby realizing the access of the three levels of the first conversion sub-circuit 30. By controlling the on and off of multiple power devices in the first conversion sub-circuit 30, the level and frequency of the DC power input to the first conversion sub-circuit 30 can be changed, thereby generating three-level AC power from the three levels of DC power input to the first conversion sub-circuit 30. The waveform of the three-level AC power is closer to a sine wave, which can effectively reduce the harmonic content and optimize the electromagnetic interference performance. At the same time, the voltage borne by each power device in the first conversion sub-circuit 30 is only half of the DC bus voltage, which can effectively reduce the switching loss of the power device of the first conversion sub-circuit 30, improve the reliability and service life of the power device, and improve the NEDC (New European Driving Cycle) operating efficiency of the electric vehicle.

[0067] For example, the first end 21 and the second end 22 of the clamping sub-circuit 20 are both connected to the midpoint 13 of the bus capacitor branch 10. The current output from the midpoint 13 of the bus capacitor branch 10 can be input into the clamping sub-circuit 20 through the first end 21 and the second end 22 of the clamping sub-circuit 20. The multiple power devices in the clamping sub-circuit 20 can be connected in parallel to the midpoint 13 of the bus capacitor branch 10. At this time, the current output from the midpoint 13 of the bus capacitor branch 10 can enter the clamping sub-circuit 20 through the two branches. The current conduction capability is improved, and the clamping sub-circuit 20 can receive more current. Therefore, the power devices in the clamping sub-circuit 20 and the first conversion sub-circuit 30 can be different. The power devices in the clamping sub-circuit 20 can adopt power devices with a small current rating. A small current flowing through the power devices in the clamping sub-circuit 20 can meet the first conversion sub-circuit 30's demand for a large current. That is to say, multiple power devices in parallel can be used to meet the first conversion sub-circuit 30's demand for a large current, thereby improving the response speed and sensitivity of the drive circuit 900.

[0068] For example, since the multiple power devices in the clamping subcircuit 20 can be connected in parallel to the midpoint 13 of the bus capacitor branch 10, the current output from the midpoint 13 of the bus capacitor branch 10 can enter the clamping subcircuit 20 through two branches, the current conducting capacity of the clamping subcircuit 20 is improved, and the clamping subcircuit 20 can receive more current. Therefore, in some embodiments, the current level of the power device in the clamping subcircuit 20 is less than the current level of the power device in the first conversion subcircuit 30. The current level indicates the current carrying capacity of the power device, and is also, for example, a rated current parameter. In this case, the power device in the clamping subcircuit 20 only needs to pass a smaller current to meet the large current requirement of the first conversion subcircuit 30, which can improve the response speed and sensitivity of the drive circuit 900 and extend the service life of the power device in the clamping subcircuit 20.

[0069] In some embodiments, as Figure 2 、 Figure 3 As shown, the clamping sub-circuit 20 includes multiple first bridge arms 20-1, and the first ends 20-11 of the multiple first bridge arms 20-1 are connected to the first end 21 of the clamping sub-circuit 20; the second ends 20-12 of the multiple first bridge arms 20-1 are connected to the second end 22 of the clamping sub-circuit 20; and the midpoints of the multiple first bridge arms 20-1 serve as the third ends 23 of the clamping sub-circuit 20.

[0070] For example, Figure 2 、 Figure 3As shown, the clamping sub-circuit 20 may include, for example, a plurality of first bridge arms 20-1. For example, the clamping sub-circuit 20 may include three first bridge arms 20-1. The first ends 20-11 of the three first bridge arms 20-1 may all be connected to the first end 21 of the clamping sub-circuit 20, that is, the first ends 20-11 of the three first bridge arms 20-1 may all be connected to the midpoint 13 of the busbar capacitor branch 10; the second ends 20-12 of the three first bridge arms 20-1 may all be connected to the second end 22 of the clamping sub-circuit 20, that is, the second ends 20-12 of the three first bridge arms 20-1 may also all be connected to the midpoint 13 of the busbar capacitor branch 10. In other words, the first end 20-11 and the second end 20-12 of each of the three first bridge arms 20-1 are connected to the midpoint 13 of the busbar capacitor branch 10.

[0071] For example, the midpoint of a bridge arm refers to the connection point between the upper and lower power devices in each arm. That is, each arm includes two power devices, and the connection point between the two power devices is the midpoint of the bridge arm. The midpoint of a bridge arm connects and distributes current in the circuit. Current flows in and out through these midpoints of the bridge arm, enabling efficient conversion and control of electrical energy.

[0072] For example, Figure 2 、 Figure 3 As shown, the midpoints of the three first bridge arms 20 - 1 can respectively serve as the third ends 23 of the clamping sub-circuit 20 , that is, there can be three third ends 23 of the clamping sub-circuit 20 , and the third ends 23 of the three clamping sub-circuits 20 can all be connected to the third end 33 of the first conversion sub-circuit 30 .

[0073] For example, Figure 2 、 Figure 3 As shown, since the first end 20-11 and the second end 20-12 of each first bridge arm 20-1 are connected to the midpoint 13 of the bus capacitor branch 10, and the midpoint of the first bridge arm 20-1 is connected to the third end 33 of the first conversion sub-circuit 30, it is equivalent to that the two power devices in each first bridge arm 20-1 are connected in parallel to the midpoint 13 of the bus capacitor branch 10. The current output from the midpoint 13 of the bus capacitor branch 10 can be input into the clamping sub-circuit 20 respectively through the two branches. The current conduction capability of the clamping sub-circuit 20 is improved, and the clamping sub-circuit 20 can receive more current. Therefore, multiple power devices in parallel can be used to meet the large current requirements of the first conversion sub-circuit 30, thereby improving the response speed and sensitivity of the drive circuit 900.

[0074] For example, Figure 2 、 Figure 3As shown, the midpoint 13 of the bus capacitor branch 10 is connected to the third end 33 of the first conversion sub-circuit 30 through parallel power devices, and the first bridge arm 20-1 of the constructed clamping sub-circuit 20 is composed of two parallel power devices, which improves the current conduction capability of the clamping sub-circuit 20.

[0075] In some embodiments, as Figure 2 、 Figure 3 As shown, the first bridge arm 20-1 includes a first power device Q1 and a second power device Q2, the first end Q1-1 of the first power device Q1 serves as the first end 20-11 of the first bridge arm 20-1, the second end Q1-2 of the first power device Q1 is connected to the first end Q2-1 of the second power device Q2, and the second end Q2-2 of the second power device Q2 serves as the second end 20-12 of the first bridge arm 20-1; the connection endpoint of the first power device Q1 and the second power device Q2 serves as the midpoint of the first bridge arm 20-1.

[0076] For example, Figure 2 、 Figure 3 As shown, the first end Q1-1 of the first power device Q1 can serve as the first end 20-11 of the first bridge arm 20-1, connected to the midpoint 13 of the busbar capacitor branch 10. The second end Q1-2 of the first power device Q1 is connected to the first end Q2-1 of the second power device Q2. The connecting point between the second end Q1-2 of the first power device Q1 and the first end Q2-1 of the second power device Q2 serves as the midpoint of the first bridge arm 20-1 and is connected to the third end 33 of the first conversion sub-circuit 30. The second end Q2-2 of the second power device Q2 can serve as the second end 20-12 of the first bridge arm 20-1, connected to the midpoint 13 of the busbar capacitor branch 10. Potential balance at the midpoint 13 of the busbar capacitor branch 10 can be achieved by controlling the opening and closing of the first power devices Q1 and the second power devices Q2 of the three first bridge arms 20-1 in the clamping sub-circuit 20.

[0077] In some embodiments, as Figure 1 、 Figure 2 、 Figure 3 As shown, the drive circuit 900 also includes a first switch subcircuit 40, wherein the first end 41 of the first switch subcircuit 40 is connected to the first end 20-11 of the plurality of first bridge arms 20-1; the second end 42 of the first switch subcircuit 40 is connected to the second end 20-12 of the plurality of first bridge arms 20-1; the third end 43 of the first switch subcircuit 40 is connected to the midpoint 13 of the bus capacitor branch 10; the first switch subcircuit 40 is configured to be turned on when the battery pack 2000 discharges the drive motor 3000; and to be turned off when the battery pack 2000 is charged.

[0078] For example, Figure 2 、 Figure 3As shown, the first end 41 of the first switch subcircuit 40 is connected to the first ends 20-11 of multiple first bridge arms 20-1, that is, the first end 20-11 of each first bridge arm 20-1 is connected to the first end 41 of the first switch subcircuit 40; the second end 42 of the first switch subcircuit 40 is connected to the second ends 20-12 of multiple first bridge arms 20-1, that is, the second end 20-12 of each first bridge arm 20-1 is connected to the second end 42 of the first switch subcircuit 40; the third end 43 of the first switch subcircuit 40 is connected to the midpoint 13 of the bus capacitor branch 10. That is to say, when the first end 41 and the third end 43 of the first switch sub-circuit 40 are turned on, the circuit from the midpoint 13 of the bus capacitor branch 10 to the first end 20-11 of the first bridge arm 20-1 is turned on; when the second end 42 and the third end 43 of the first switch sub-circuit 40 are turned on, the circuit from the midpoint 13 of the bus capacitor branch 10 to the second end 20-12 of the first bridge arm 20-1 is turned on.

[0079] For example, Figure 1 、 Figure 2 、 Figure 3 As shown, the first switch subcircuit 40 is turned on when the battery pack 2000 discharges the drive motor 3000, that is, when the battery pack 2000 discharges the drive motor 3000, the first end 41 of the first switch subcircuit 40 is turned on and the third end 43 is turned on, and the second end 42 of the first switch subcircuit 40 is also turned on and the third end 43 of the first switch subcircuit 40; the first switch subcircuit 40 is turned off when charging the battery pack 2000, that is, when charging the battery pack 2000, the first end 41 of the first switch subcircuit 40 is turned off and the third end 43 is turned off, and the second end 42 of the first switch subcircuit 40 is also turned off and the third end 43 of the first switch subcircuit 40, which can ensure that the drive circuit 900 of the charge-discharge circuit 1000 is a complete discharge circuit when discharging, and the charge-discharge circuit 1000 is a complete charging circuit when charging, thereby preventing the discharge circuit and the charging circuit from affecting each other.

[0080] In some embodiments, as Figure 2 、 Figure 3 As shown, the first switch subcircuit 40 includes a first switch K1 and a second switch K2, and the first ends 20-11 of multiple first bridge arms 20-1 are connected to the midpoint 13 of the bus capacitor branch 10 through the first switch K1; the second ends 20-12 of multiple first bridge arms 20-1 are connected to the midpoint 13 of the bus capacitor branch 10 through the second switch K2.

[0081] For example, Figure 2 、 Figure 3As shown, the first end of the first switch K1 can serve as the first end 41 of the first switch sub-circuit 40; the first end of the second switch K2 can serve as the second end 42 of the first switch sub-circuit 40; the second end of the first switch K1 is connected to the second end of the second switch K2, and the connection end point can serve as the third end 43 of the first switch sub-circuit 40.

[0082] For example, Figure 2 、 Figure 3 As shown, the first end 20-11 of each first bridge arm 20-1 is connected to the midpoint 13 of the bus capacitor branch 10 via a first switch K1; the second end 20-12 of each first bridge arm 20-1 is connected to the midpoint 13 of the bus capacitor branch 10 via a second switch K2. The first switch K1 controls the conduction of the circuit from the midpoint 13 of the bus capacitor branch 10 to the first end 20-11 of each first bridge arm 20-1, and the second switch K2 controls the conduction of the circuit from the midpoint 13 of the bus capacitor branch 10 to the second end 20-12 of each first bridge arm 20-1.

[0083] In some embodiments, as Figure 2 、 Figure 3 As shown, the first conversion sub-circuit 30 includes multiple second bridge arms 30-1, and the first ends 30-11 of the multiple second bridge arms 30-1 are connected to the first pole 2001 of the battery pack 2000; the second ends 30-12 of the multiple second bridge arms 30-1 are connected to the second pole 2002 of the battery pack 2000; the midpoints of the multiple second bridge arms 30-1 are respectively connected to the midpoints of the multiple first bridge arms 20-1, and the midpoints of the multiple second bridge arms 30-1 are also connected to the drive motor 3000.

[0084] For example, Figure 1 、 Figure 2 、 Figure 3 As shown, the first end 31 of the first conversion sub-circuit 30 is connected to the first pole 2001 of the battery pack 2000, and is also connected to the first end 11 of the bus capacitor branch 10; the second end 32 of the first conversion sub-circuit 30 is connected to the second pole 2002 of the battery pack 2000, and is also connected to the second end 12 of the bus capacitor branch 10; the third end 33 of the first conversion sub-circuit 30 is connected to the third end 23 of the clamping sub-circuit 20, and is also connected to the drive motor 3000.

[0085] For example, Figure 2 、 Figure 3As shown, the first conversion sub-circuit 30 may include, for example, multiple second bridge arms 30-1. For example, the first conversion sub-circuit 30 may include three second bridge arms 30-1. The first ends 30-11 of the three second bridge arms 30-1 may all be connected to the first end 31 of the first conversion sub-circuit 30, that is, the first ends 30-11 of the three second bridge arms 30-1 may all be connected to the first pole 2001 of the battery pack 2000 and the first end 11 of the bus capacitor branch 10. The second ends 30-12 of the three second bridge arms 30-1 may all be connected to the second end 32 of the first conversion sub-circuit 30, that is, the second ends 30-12 of the three second bridge arms 30-1 may all be connected to the second pole 2002 of the battery pack 2000 and the second end 12 of the bus capacitor branch 10.

[0086] For example, Figure 2 、 Figure 3 As shown, the midpoints of the three second bridge arms 30 - 1 can respectively serve as the third ends 33 of the first conversion sub-circuit 30 , that is, there can be three third ends 33 of the first conversion sub-circuit 30 , and the third ends 33 of the three first conversion sub-circuits 30 can all be connected to the third end 23 of the clamping sub-circuit 20 , and can also all be connected to the drive motor 3000 .

[0087] For example, Figure 2 、 Figure 3 As shown, when the midpoints of the three first bridge arms 20 - 1 serve as the third ends 23 of the clamping sub-circuit 20 , the midpoints of the three second bridge arms 30 - 1 can be connected to the midpoints of the three first bridge arms 20 - 1 , respectively, to achieve the connection between the third end 33 of the first conversion sub-circuit 30 and the third end 23 of the clamping sub-circuit 20 .

[0088] In some embodiments, as Figure 2 、 Figure 3 As shown, the second bridge arm 30-1 includes a third power device Q3 and a fourth power device Q4, the first end Q3-1 of the third power device Q3 serves as the first end 30-11 of the second bridge arm 30-1, the second end Q3-2 of the third power device Q3 is connected to the first end Q4-1 of the fourth power device Q4, and the second end Q4-2 of the fourth power device Q4 serves as the second end 30-12 of the second bridge arm 30-1; the connection endpoint of the third power device Q3 and the fourth power device Q4 serves as the midpoint of the second bridge arm 30-1.

[0089] Exemplarily, the third power device Q3 and the fourth power device Q4 of each second bridge arm 30-1 may be of the same type. For example, the third power device Q3 and the fourth power device Q4 may both be Si (silicon) IGBTs (Insulated Gate Bipolar Transistors); the third power device Q3 and the fourth power device Q4 may both be Si (silicon) MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors); the third power device Q3 and the fourth power device Q4 may both be SiC (Silicon Carbide) MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors); the third power device Q3 and the fourth power device Q4 may both be GaN (Gallium Nitride) HEMTs (High Electron Mobility Transistors). This disclosure is not limited herein.

[0090] For example, Figure 2 、 Figure 3 As shown, the first end Q3-1 of the third power device Q3 can serve as the first end 30-11 of the second bridge arm 30-1, connected to the first pole 2001 of the battery pack 2000 and the first end 11 of the busbar capacitor branch 10. The second end Q3-2 of the third power device Q3 is connected to the first end Q4-1 of the fourth power device Q4. The connecting point between the second end Q3-2 of the third power device Q3 and the first end Q4-1 of the fourth power device Q4 serves as the midpoint of the second bridge arm 30-1 and is connected to the midpoint of the first bridge arm 20-1. The second end Q4-2 of the fourth power device Q4 can serve as the second end 30-12 of the second bridge arm 30-1, connected to the second pole 2002 of the battery pack 2000 and the second end 12 of the busbar capacitor branch 10.

[0091] For example, the controller can be used to control the third power device Q3 and the fourth power device Q4 of the three second bridge arms 30-1 in the first conversion sub-circuit 30 to be periodically turned on and off, so that the third end 33 of the first conversion sub-circuit 30 outputs a voltage with a sinusoidal waveform, converting direct current into alternating current.

[0092] In some embodiments, as Figure 1 、 Figure 2 、 Figure 3As shown, the drive circuit 900 also includes a second switch sub-circuit 50, wherein the first end 51 of the second switch sub-circuit 50 is connected to the midpoint of the plurality of first bridge arms 20-1; the second end 52 of the second switch sub-circuit 50 is connected to the midpoint of the plurality of second bridge arms 30-1; the second switch sub-circuit 50 is configured to be turned on when the battery pack 2000 discharges the drive motor 3000; and to be turned off when the battery pack 2000 is charged.

[0093] For example, Figure 2 、 Figure 3 As shown, the first end 51 of the second switch sub-circuit 50 is connected to the midpoints of multiple first bridge arms 20-1, that is, the midpoint of each first bridge arm 20-1 is connected to the first end 51 of the second switch sub-circuit 50; the second end 52 of the second switch sub-circuit 50 is connected to the midpoints of multiple second bridge arms 30-1, that is, the midpoint of each second bridge arm 30-1 is connected to the second end 52 of the second switch sub-circuit 50. In other words, the midpoints of the three first bridge arms 20-1 are connected to the midpoints of the three second bridge arms 30-1 respectively through the second switch sub-circuit 50. When the first end 51 and the second end 52 of the second switch sub-circuit 50 are conductive, the circuit from the midpoint of the first bridge arm 20-1 to the midpoint of the second bridge arm 30-1 is conductive; when the first end 51 and the second end 52 of the second switch sub-circuit 50 are disconnected, the circuit from the midpoint of the first bridge arm 20-1 to the midpoint of the second bridge arm 30-1 is disconnected.

[0094] For example, Figure 1 、 Figure 2 、 Figure 3 As shown, the second switch subcircuit 50 is turned on when the battery pack 2000 discharges the drive motor 3000, that is, when the battery pack 2000 discharges the drive motor 3000, the first end 51 and the second end 52 of the second switch subcircuit 50 are turned on; the second switch subcircuit 50 is turned off when charging the battery pack 2000, that is, when charging the battery pack 2000, the first end 51 and the second end 52 of the second switch subcircuit 50 are turned off, which can ensure that the drive circuit 900 of the charge and discharge circuit 1000 is a complete discharge circuit when discharging, and the charge and discharge circuit 1000 is a complete charging circuit when charging, thereby preventing the discharge circuit and the charging circuit from affecting each other.

[0095] In some embodiments, as Figure 2 、 Figure 3 As shown, the second switch sub-circuit 50 includes a plurality of third switches K3 , and the midpoint of the first bridge arm 20 - 1 is connected to the midpoint of the second bridge arm 30 - 1 through the third switches K3 .

[0096] For example, Figure 2 、 Figure 3As shown, the second switch subcircuit 50 may include, for example, three third switches K3 , the first end 51 of the second switch subcircuit 50 may include the first ends of the three third switches K3 ; the second end 52 of the second switch subcircuit 50 may include the second ends of the three third switches K3 .

[0097] For example, Figure 2 、 Figure 3 As shown, the midpoint of each first bridge arm 20-1 can be connected to the midpoint of the second bridge arm 30-1 through a third switch K3. The third switch K3 controls the on-off between the midpoint of the first bridge arm 20-1 and the midpoint of the second bridge arm 30-1.

[0098] In some embodiments, as Figure 1 、 Figure 2 、 Figure 3 As shown, the driving motor 3000 includes a plurality of first windings 3001 , and the plurality of first windings 3001 are respectively connected to the midpoints of the plurality of second bridge arms 30 - 1 .

[0099] For example, Figure 1 、 Figure 2 、 Figure 3 As shown, the drive motor 3000 may include, for example, three first windings 3001, each of which is connected to the midpoint of a second bridge arm 30-1. The first conversion sub-circuit 30 converts the DC power from the battery pack 2000 into AC power, which is then transmitted from the midpoint of the second bridge arm 30-1 to the first winding 3001 of the drive motor 3000. The drive motor 3000 receives the current to drive the electric vehicle.

[0100] In some embodiments, as Figure 1 、 Figure 2 、 Figure 3 As shown, the drive circuit 900 also includes a third conversion sub-circuit 110, the first end 111 of the third conversion sub-circuit 110 is connected to the first pole 2001 of the battery pack 2000; the second end 112 of the third conversion sub-circuit 110 is connected to the second pole 2002 of the battery pack 2000; the third end 113 of the third conversion sub-circuit 110 is configured to be connected to the generator 4000; the third conversion sub-circuit 110 is configured to convert the AC power output by the generator 4000 into DC power to charge the battery pack 2000.

[0101] For example, generator 4000 is a device that converts mechanical energy into electrical energy. Its core principle is to utilize the electromagnetic induction phenomenon generated when a conductor moves in a magnetic field. Generator 4000, for example, consists of two parts: a stator and a rotor. The stator is equipped with windings, and the rotor is equipped with excitation windings. When the rotor rotates in the magnetic field, the magnetic field generated by the excitation winding cuts through the stator winding. According to the law of electromagnetic induction, this generates an electromotive force in the stator winding, which in turn drives free electrons to form a current in the wire.

[0102] For example, Figure 1 、 Figure 2 、 Figure 3 As shown, the third conversion sub-circuit 110 can be used to convert the AC power output by the generator 4000 into DC power to charge the battery pack 2000. The third terminal 113 of the third conversion sub-circuit 110 is connected to the generator 4000, allowing the AC power output by the generator 4000 to be input into the third conversion sub-circuit 110. The first terminal 111 of the third conversion sub-circuit 110 is connected to the first terminal 2001 of the battery pack 2000, and the second terminal 112 of the third conversion sub-circuit 110 is connected to the second terminal 2002 of the battery pack 2000. The DC power converted by the third conversion sub-circuit 110 can charge the battery pack 2000.

[0103] In some embodiments, the current level of the power device in the clamping sub-circuit 20 is smaller than the current level of the power device in the third conversion sub-circuit 110 .

[0104] In some embodiments, as Figure 2 、 Figure 3 As shown, the third conversion sub-circuit 110 includes multiple fourth bridge arms 110-1, where the first ends 110-11 of the multiple fourth bridge arms 110-1 are connected to the first end 111 of the third conversion sub-circuit 110; the second ends 110-12 of the multiple fourth bridge arms 110-1 are connected to the second end 112 of the third conversion sub-circuit 110; and the midpoints of the multiple fourth bridge arms 110-1 serve as the third ends 113 of the third conversion sub-circuit 110.

[0105] For example, Figure 2 、 Figure 3As shown, the third conversion sub-circuit 110 may include, for example, three fourth bridge arms 110-1. The first ends 110-11 of the three fourth bridge arms 110-1 may all be connected to the first end 111 of the third conversion sub-circuit 110, i.e., the first ends 110-11 of the three fourth bridge arms 110-1 may all be connected to the first terminal 2001 of the battery pack 2000; and the second ends 110-12 of the three fourth bridge arms 110-1 may all be connected to the second end 112 of the third conversion sub-circuit 110, i.e., the second ends 110-12 of the three fourth bridge arms 110-1 may all be connected to the second terminal 2002 of the battery pack 2000.

[0106] For example, Figure 2 、 Figure 3 As shown, the midpoints of the three fourth bridge arms 110 - 1 can respectively serve as the third end 113 of the third conversion sub-circuit 110 , that is, the third end 113 of the third conversion sub-circuit 110 can include three, and the midpoints of the three fourth bridge arms 110 - 1 can respectively be connected to the generator 4000 .

[0107] In some embodiments, as Figure 2 、 Figure 3 As shown, the fourth bridge arm 110-1 includes a seventh power device Q7 and an eighth power device Q8, the first end of the seventh power device Q7 serves as the first end 110-11 of the fourth bridge arm 110-1, the second end of the seventh power device Q7 is connected to the first end of the eighth power device Q8, and the second end of the eighth power device Q8 serves as the second end 110-12 of the fourth bridge arm 110-1; the connection endpoint of the seventh power device Q7 and the eighth power device Q8 serves as the midpoint of the fourth bridge arm 110-1.

[0108] Exemplarily, the seventh power device Q7 and the eighth power device Q8 of each fourth bridge arm 110-1 may be of the same type. For example, the seventh power device Q7 and the eighth power device Q8 may both be Si (silicon) IGBTs (Insulated Gate Bipolar Transistors); the seventh power device Q7 and the eighth power device Q8 may both be Si (silicon) MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors); the seventh power device Q7 and the eighth power device Q8 may both be SiC (Silicon Carbide) MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors); the seventh power device Q7 and the eighth power device Q8 may both be GaN (Gallium Nitride) HEMTs (High Electron Mobility Transistors). This disclosure is not limited thereto.

[0109] For example, Figure 2 、 Figure 3 As shown, the first end of the seventh power device Q7 can serve as the first end 110-11 of the fourth bridge arm 110-1, connected to the first pole 2001 of the battery pack 2000. The second end of the seventh power device Q7 is connected to the first end of the eighth power device Q8. The connecting point between the second end of the seventh power device Q7 and the first end of the eighth power device Q8 serves as the midpoint of the fourth bridge arm 110-1, connected to the generator 4000. The second end of the eighth power device Q8 can serve as the second end 110-12 of the fourth bridge arm 110-1, connected to the second pole 2002 of the battery pack 2000.

[0110] Currently, the onboard chargers used to charge battery packs 2000 in electric vehicles include two-stage onboard chargers. These primarily consist of a front-stage PFC (Power Factor Correction) circuit and a back-stage DC / DC circuit. The front-stage PFC circuit, which includes an AC-DC rectifier circuit and a resonant converter, converts AC power from an external power source into DC power while simultaneously performing power factor correction to optimize power quality. The back-stage DC / DC circuit further adjusts the DC power generated by the front-stage PFC to a voltage and current suitable for charging battery pack 2000 and provides electrical isolation.

[0111] In a two-stage on-board charger, the busbar is responsible for transmitting high-power DC power, ensuring stable and reliable power transmission from the front-stage PFC circuit to the back-stage DC / DC circuit. Therefore, a two-stage on-board charger requires a larger busbar to handle high voltage and high current to ensure system stability, which limits further improvements in the power density of the on-board charger.

[0112] In some embodiments, as Figure 1 、 Figure 2 、 Figure 3 As shown, a charge and discharge circuit 1000 is provided, and the charge and discharge circuit 1000 includes the drive circuit 900, the charging port 60 and the rectifier circuit 70 described in some of the above embodiments; the charging port 60 is connected to the third end 23 of the clamping sub-circuit 20, and the clamping sub-circuit 20 is further configured to convert the industrial frequency AC power provided by the charging port 60 into high-frequency AC power when charging the battery pack 2000; the rectifier circuit 70 is connected to the first end 21 and the second end 22 of the clamping sub-circuit 20, and the rectifier circuit 70 is suitable for connecting to the battery pack 2000; the rectifier circuit 70 is configured to convert AC power into DC power to charge the battery pack 2000.

[0113] For example, Figure 1 、 Figure 2 、 Figure 3 As shown, the charge-discharge circuit 1000 may include a charging port 60 ; the charging port 60 is used to connect to an external power source and can serve as an interface between the electric vehicle and the external power source. The external power source can charge the battery pack 2000 through the charge-discharge circuit 1000 .

[0114] For example, Figure 1 、 Figure 2 、 Figure 3 As shown, the charging port 60 can be connected to the third terminal 23 of the clamping sub-circuit 20. The charge-discharge circuit 1000 can also include a rectifier circuit 70; the rectifier circuit 70 is connected to the first terminal 21 and the second terminal 22 of the clamping sub-circuit 20. In this case, the charging port 60, the clamping sub-circuit 20, and the rectifier circuit 70 constitute the charging circuit of the charge-discharge circuit 1000.

[0115] For example, the clamping sub-circuit 20 can be used to convert the industrial frequency AC power of the external power supply provided by the charging port 60 into high-frequency AC power when charging the battery pack 2000; the rectifier sub-circuit 70 is used to convert the high-frequency AC power output by the clamping sub-circuit 20 into DC power, thereby charging the battery pack 2000.

[0116] Illustratively, industrial frequency alternating current refers to alternating current used in a power system and having a frequency of an industrial standard value.

[0117] For example, in the aforementioned charge-discharge circuit 1000, the original two-stage on-board charger can be replaced with a single-stage on-board charger. A single-stage on-board charger has a relatively simple topology and may include only a single power conversion stage, which converts AC power into DC power to directly charge the battery pack 2000. Specifically, in the aforementioned charge-discharge circuit 1000, the rectifier circuit 70 of the charging circuit serves as the power conversion stage of the single-stage on-board charger, converting AC power into DC power to directly charge the battery pack 2000.

[0118] For example, in the discharge loop of the charge-discharge circuit 1000 , the multiple power devices of the clamping sub-circuit 20 may be bidirectional power devices having switching capabilities of forward conduction, omnidirectional cutoff, and negative conduction.

[0119] For example, in the charging circuit of the above-mentioned charge and discharge circuit 1000, the clamping sub-circuit 20 in the discharge circuit of the charge and discharge circuit 1000 can also be reused. Through the forward conduction, omnidirectional cutoff, and negative conduction switching capabilities of the bidirectional power devices in the clamping sub-circuit 20, the industrial frequency AC power of the external power supply can be converted into high-frequency AC power by controlling the conduction or cutoff of multiple bidirectional power devices; at the same time, the flow direction and magnitude of the current can be controlled by the conduction or cutoff of the bidirectional power devices, thereby achieving efficient power conversion and current waveform optimization, thereby optimizing the input current waveform, improving the power factor, and reducing harmonic interference.

[0120] Therefore, in the charging and discharging circuit 1000, the clamping sub-circuit 20 can be reused. When the battery pack 2000 discharges the drive motor 3000, the clamping sub-circuit 20 can stabilize the voltage at the midpoint 13 of the bus capacitor branch 10; when the battery pack 2000 is charging, the clamping sub-circuit 20 can convert the industrial frequency AC power provided by the charging port 60 into high-frequency AC power, and can also achieve efficient power conversion and current waveform optimization, thereby optimizing the input current waveform, improving the power factor, and reducing harmonic interference.

[0121] At the same time, a single-stage on-board charger can be used to charge battery pack 2000. This means that only one power conversion stage (rectifier circuit 70) is required to convert AC power to DC power and charge battery pack 2000. Compared to conventional multi-stage on-board chargers that utilize a totem-pole AC-DC converter circuit, a full-bridge DC-AC converter circuit, and a full-bridge AC-DC converter circuit, the single-stage on-board charger eliminates the power inductor and high-capacity support capacitors required for the totem-pole AC-DC converter circuit. Furthermore, the compact internal structure allows for higher power output within the same volume, thereby improving power density. By reusing the clamping sub-circuit 20, a complete charging loop within charge-discharge circuit 1000 can be constructed without the addition of additional power devices. This significantly reduces the passive and power device requirements of charge-discharge circuit 1000 and improves the power density of the charge-discharge system.

[0122] In some embodiments, as Figure 1 、 Figure 2 、 Figure 3 As shown, the clamping sub-circuit 20 includes a plurality of first bridge arms 20 - 1 ; the charging port 60 includes a plurality of first ports L1 , and the plurality of first ports L1 are respectively connected to the midpoints of the plurality of first bridge arms 20 - 1 .

[0123] For example, Figure 1 、 Figure 2 、 Figure 3 As shown, the charging port 60 may include, for example, three first ports L1 , and the three first ports L1 may be connected to the midpoints of the three first bridge arms 20 - 1 , respectively.

[0124] In some embodiments, as Figure 1 、 Figure 2 、 Figure 3 As shown, the rectifier sub-circuit 70 includes an isolation transformer 71 , a first end 711 of the isolation transformer 71 is connected to the first end 21 of the clamp sub-circuit 20 , and a second end 712 of the isolation transformer 71 is connected to the second end 22 of the clamp sub-circuit 20 .

[0125] Illustratively, the isolation transformer 71 can electrically and physically separate a circuit into two parts, preventing direct current flow between the input and output. The isolation transformer 71 can, for example, include an electromagnetic coupling element. The isolation transformer 71 can include an input winding 71-1 and an output winding 71-2. The first end of the input winding 71-1 is the first end 711 of the isolation transformer 71, and the second end of the input winding 71-1 is the second end 712 of the isolation transformer 71. The first end of the output winding 71-2 is the third end 713 of the isolation transformer 71, and the second end of the output winding 71-2 is the fourth end 714 of the isolation transformer 71.

[0126] For example, Figure 1 、 Figure 2 、 Figure 3 As shown, the first end 711 of the isolation transformer 71 is connected to the first end 21 of the clamping sub-circuit 20, that is, the first end of the input winding 71-1 is connected to the first end 21 of the clamping sub-circuit 20; the second end 712 of the isolation transformer 71 is connected to the second end 22 of the clamping sub-circuit 20, that is, the second end of the input winding 71-1 is connected to the second end 22 of the clamping sub-circuit 20.

[0127] For example, Figure 1 、 Figure 2 、 Figure 3 As shown, the third terminal 713 and the fourth terminal 714 of the isolation transformer 71 can be connected to the second conversion sub-circuit 72 .

[0128] In some embodiments, as Figure 1 、 Figure 2 、 Figure 3 As shown, the rectifier sub-circuit 70 also includes a second conversion sub-circuit 72, the first end 721 of the second conversion sub-circuit 72 is connected to the first pole 2001 of the battery pack 2000; the second end 722 of the second conversion sub-circuit 72 is connected to the second pole 2002 of the battery pack 2000; and the third end 723 of the second conversion sub-circuit 72 is connected to the third end 713 and the fourth end 714 of the isolation transformer 71.

[0129] For example, Figure 1 、 Figure 2 、 Figure 3 As shown, the second conversion sub-circuit 72 can be used to convert high-frequency AC power into DC power to charge the battery pack 2000. The first end 721 of the second conversion sub-circuit 72 is connected to the first terminal 2001 of the battery pack 2000, and the second end 722 of the second conversion sub-circuit 72 is connected to the second terminal 2002 of the battery pack 2000, thereby connecting the second conversion sub-circuit 72 to the battery pack 2000.

[0130] For example, Figure 1 、 Figure 2 、 Figure 3 As shown, the third end 723 of the second conversion sub-circuit 72 is connected to the third end 713 and the fourth end 714 of the isolation transformer 71, that is, the first end and the second end of the output winding 71-2 of the isolation transformer 71 are respectively connected to the third end 723 of the second conversion sub-circuit 72, so that the high-frequency AC power converted by the clamping sub-circuit 20 can be input into the second conversion sub-circuit 72.

[0131] In some embodiments, as Figure 2 、 Figure 3As shown, the second conversion sub-circuit 72 includes two third bridge arms 72-1, the first end 72-11 of the third bridge arm 72-1 is connected to the first end 721 of the second conversion sub-circuit 72, and the second end 72-12 of the third bridge arm 72-1 is connected to the second end 722 of the second conversion sub-circuit 72; the midpoints of the two third bridge arms 72-1 serve as the third ends 723 of the second conversion sub-circuit 72, and the midpoints of the two third bridge arms 72-1 are respectively connected to the third end 713 and the fourth end 714 of the isolation transformer 71.

[0132] For example, Figure 2 、 Figure 3 As shown, the second conversion sub-circuit 72 may include, for example, two third bridge arms 72-1. The first ends 72-11 of the two third bridge arms 72-1 may be connected to the first end 721 of the second conversion sub-circuit 72, i.e., the first ends 72-11 of the two third bridge arms 72-1 may be connected to the first terminal 2001 of the battery pack 2000; and the second ends 72-12 of the two third bridge arms 72-1 may be connected to the second end 722 of the second conversion sub-circuit 72, i.e., the second ends 72-12 of the two third bridge arms 72-1 may be connected to the second terminal 2002 of the battery pack 2000.

[0133] For example, Figure 2 、 Figure 3 As shown, the midpoints of the two third bridge arms 72-1 can respectively serve as the third end 723 of the second conversion sub-circuit 72, that is, there can be two third ends 723 of the second conversion sub-circuit 72, and the midpoints of the two third bridge arms 72-1 can respectively be connected to the third end 713 and the fourth end 714 of the isolation transformer 71.

[0134] In some embodiments, as Figure 2 、 Figure 3 As shown, the third bridge arm 72-1 includes a fifth power device Q5 and a sixth power device Q6, the first end of the fifth power device Q5 serves as the first end 72-11 of the third bridge arm 72-1, the second end of the fifth power device Q5 is connected to the first end of the sixth power device Q6, and the second end of the sixth power device Q6 serves as the second end 72-12 of the third bridge arm 72-1; the connection endpoint of the fifth power device Q5 and the sixth power device Q6 serves as the midpoint of the third bridge arm 72-1.

[0135] Exemplarily, the fifth power device Q5 and the sixth power device Q6 of each third bridge arm 72-1 may be of the same type. For example, the fifth power device Q5 and the sixth power device Q6 may both be Si (silicon) IGBTs (Insulated Gate Bipolar Transistors); the fifth power device Q5 and the sixth power device Q6 may both be Si (silicon) MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors); the fifth power device Q5 and the sixth power device Q6 may both be SiC (Silicon Carbide) MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors); the fifth power device Q5 and the sixth power device Q6 may both be GaN (Gallium Nitride) HEMTs (High Electron Mobility Transistors). This disclosure is not limited thereto.

[0136] For example, Figure 2 、 Figure 3 As shown, the first end of the fifth power device Q5 can serve as the first end 72-11 of the third bridge arm 72-1, connected to the first terminal 2001 of the battery pack 2000. The second end of the fifth power device Q5 is connected to the first end of the sixth power device Q6. The connecting endpoint of the second end of the fifth power device Q5 and the first end of the sixth power device Q6 serves as the midpoint of the third bridge arm 72-1, connected to the third terminal 713 or the fourth terminal 714 of the isolation transformer 71. The second end of the sixth power device Q6 can serve as the second end 72-12 of the third bridge arm 72-1, connected to the second terminal 2002 of the battery pack 2000.

[0137] For example, Figure 2 、 Figure 3 As shown, the high-frequency alternating current converted by the clamping sub-circuit 20 can be input into the second conversion sub-circuit 72 through the midpoint of the third bridge arm 72 - 1 .

[0138] In some embodiments, as Figure 1 、 Figure 2 、 Figure 3As shown, the clamping subcircuit 20 includes multiple first bridge arms 20-1; the charge and discharge circuit 1000 also includes a third switch subcircuit 80, the first end 81 of the third switch subcircuit 80 is connected to the first end 20-11 and the second end 20-12 of the multiple first bridge arms 20-1, and the second end 82 of the third switch subcircuit 80 is connected to the first end 711 and the second end 712 of the isolation transformer 71; the third switch subcircuit 80 is configured to be cut off when the battery pack 2000 discharges the drive motor 3000; and to be turned on when charging the battery pack 2000.

[0139] For example, Figure 1 、 Figure 2 、 Figure 3 As shown, the first end 81 of the third switch sub-circuit 80 is connected to the first ends 20-11 and the second ends 20-12 of the multiple first bridge arms 20-1, that is, the first end 20-11 and the second end 20-12 of each first bridge arm 20-1 are connected to the first end 81 of the third switch sub-circuit 80; the second end 82 of the third switch sub-circuit 80 is connected to the first end 711 and the second end 712 of the isolation transformer 71, that is, the first end 711 and the second end 712 of the isolation transformer 71 are connected to the second end 82 of the third switch sub-circuit 80; that is, the first ends 20-11 of the multiple first bridge arms 20-1 are connected to the first end 711 of the isolation transformer 71 through the third switch sub-circuit 80, and the second ends 20-12 of the multiple first bridge arms 20-1 are connected to the second end 712 of the isolation transformer 71 through the third switch sub-circuit 80. When the third switch sub-circuit 80 is turned on, the first ends 20-11 of the multiple first bridge arms 20-1 are connected to the first end 711 of the isolation transformer 71, and the second ends 20-12 of the multiple first bridge arms 20-1 are connected to the second end 712 of the isolation transformer 71; when the third switch sub-circuit 80 is turned off, the first ends 20-11 of the multiple first bridge arms 20-1 are turned off from the first end 711 of the isolation transformer 71, and the second ends 20-12 of the multiple first bridge arms 20-1 are turned off from the second end 712 of the isolation transformer 71.

[0140] For example, Figure 1 、 Figure 2 、 Figure 3 As shown, the third switch subcircuit 80 is turned on when the battery pack 2000 is charged, that is, when the battery pack 2000 is charged, the first end 81 and the second end 82 of the third switch subcircuit 80 are turned on; the third switch subcircuit 80 is turned off when the battery pack 2000 discharges the drive motor 3000, that is, when the battery pack 2000 discharges the drive motor 3000, the first end 81 and the second end 82 of the third switch subcircuit 80 are turned off, which can ensure that the charge and discharge circuit 1000 is a complete discharge circuit when discharging and a complete charging circuit when charging, thereby preventing the discharge circuit and the charging circuit from affecting each other.

[0141] In some embodiments, as Figure 2 、 Figure 3 As shown, the third switch sub-circuit 80 includes a fourth switch K4 and a fifth switch K5. The first end 711 of the isolation transformer 71 is connected to the first ends 20-11 of the multiple first bridge arms 20-1 through the fourth switch K4; the second end 712 of the isolation transformer 71 is connected to the second ends 20-12 of the multiple first bridge arms 20-1 through the fifth switch K5.

[0142] For example, Figure 2 、 Figure 3 As shown, the first end 81 of the third switch subcircuit 80 may include, for example, the first end of the fourth switch K4 and the first end of the fifth switch K5; the second end 82 of the third switch subcircuit 80 may include, for example, the second end of the fourth switch K4 and the second end of the fifth switch K5.

[0143] For example, Figure 2 、 Figure 3 As shown, the first end 20-11 of each first bridge arm 20-1 can be connected to the first end 711 of the isolation transformer 71 via a fourth switch K4; and the second end 20-12 of each first bridge arm 20-1 can be connected to the second end 712 of the isolation transformer 71 via a fifth switch K5. The fourth switch K4 controls the conduction between the first end 20-11 of each first bridge arm 20-1 and the first end 711 of the isolation transformer 71, and the fifth switch K5 controls the conduction between the second end 20-12 of each first bridge arm 20-1 and the second end 712 of the isolation transformer 71.

[0144] In some embodiments, as Figure 1 、 Figure 2 、 Figure 3 As shown, the charge and discharge circuit 1000 also includes a fourth switch subcircuit 90, a first end 91 of the fourth switch subcircuit 90 is connected to the charging port 60, and a second end 92 of the fourth switch subcircuit 90 is connected to the midpoint of the plurality of first bridge arms 20-1; the fourth switch subcircuit 90 is configured to be cut off when the battery pack 2000 discharges the drive motor 3000; and to be turned on when charging the battery pack 2000.

[0145] For example, Figure 1 、 Figure 2 、 Figure 3As shown, the first end 91 of the fourth switch subcircuit 90 is connected to the charging port 60, that is, the multiple first ports L1 of the charging port 60 are all connected to the first end 91 of the fourth switch subcircuit 90. The second end 92 of the fourth switch subcircuit 90 is connected to the midpoints of the multiple first bridge arms 20-1, that is, the midpoints of the multiple first bridge arms 20-1 are all connected to the second end 82 of the third switch subcircuit 80. In other words, the midpoints of the multiple first bridge arms 20-1 are respectively connected to the multiple first ports L1 of the charging port 60 through the fourth switch subcircuit 90. When the fourth switch subcircuit 90 is on, the midpoints of the multiple first bridge arms 20-1 are respectively connected to the multiple first ports L1 of the charging port 60; when the fourth switch subcircuit 90 is off, the midpoints of the multiple first bridge arms 20-1 are respectively disconnected from the multiple first ports L1 of the charging port 60.

[0146] For example, Figure 1 、 Figure 2 、 Figure 3 As shown, the fourth switch subcircuit 90 is turned on when the battery pack 2000 is charged, that is, when the battery pack 2000 is charged, the first end 91 and the second end 92 of the fourth switch subcircuit 90 are turned on; the fourth switch subcircuit 90 is turned off when the battery pack 2000 discharges the drive motor 3000, that is, when the battery pack 2000 discharges the drive motor 3000, the first end 91 and the second end 92 of the fourth switch subcircuit 90 are turned off, which can ensure that the charge and discharge circuit 1000 is a complete discharge circuit when discharging and a complete charging circuit when charging, thereby preventing the discharge circuit and the charging circuit from affecting each other.

[0147] In some embodiments, as Figure 2 、 Figure 3 As shown, the fourth switch sub-circuit 90 includes a plurality of sixth switches K6 , and the first port L1 of the charging port 60 is connected to the midpoint of the first bridge arm 20 - 1 through the sixth switches K6 .

[0148] For example, Figure 2 、 Figure 3 As shown, the first end 91 of the fourth switch subcircuit 90 may include, for example, first ends of multiple sixth switches K6 ; the second end 92 of the fourth switch subcircuit 90 may include, for example, second ends of multiple sixth switches K6 .

[0149] For example, Figure 2 、 Figure 3 As shown, the midpoint of each first bridge arm 20 - 1 can be connected to the first port L1 through a sixth switch K6 . The sixth switch K6 controls the conduction between the midpoint of the first bridge arm 20 - 1 and the first port L1 .

[0150] In some embodiments, as Figure 2 、 Figure 3As shown, the rectifier sub-circuit 70 further includes a first capacitor C3 , which is connected between the first pole 2001 and the second pole 2002 of the battery pack 2000 , and is also connected between the first end 721 and the second end 722 of the second conversion sub-circuit 72 .

[0151] In some embodiments, as Figure 2 、 Figure 3 As shown, the first end of the first capacitor C3 is connected to the first pole 2001 of the battery pack 2000 and is also connected to the first end 721 of the second conversion sub-circuit 72; the second end of the first capacitor C3 is connected to the second pole 2002 of the battery pack 2000 and is also connected to the second end 722 of the second conversion sub-circuit 72.

[0152] In some embodiments, as Figure 2 、 Figure 3 As shown, the charge and discharge circuit 1000 further includes a filter 100, a first end of the filter 100 being connected to the charging port 60, and a second end of the filter 100 being connected to the third end 23 of the clamping sub-circuit 20. The filter 100 is used to stabilize the power supply voltage and suppress electromagnetic interference.

[0153] In some embodiments, the first power device Q1 and the second power device Q2 in the clamping sub-circuit 20 can both be bidirectional power devices, which can meet the current flow requirements of the clamping sub-circuit 20 in the discharge loop and the charging loop of the charge and discharge circuit 1000.

[0154] In some embodiments, as Figure 4 As shown, the first power device Q1 and the second power device Q2 each include a first switching tube 1 and a second switching tube 2. The first end 1-1 of the first switching tube 1 is connected to the first end 2-1 of the second switching tube 2, the second end 1-2 of the first switching tube 1 serves as the first end Q1-1 of the first power device Q1 or the first end Q2-1 of the second power device Q2, and the second end 2-2 of the second switching tube 2 serves as the second end Q1-2 of the first power device Q1 or the second end Q2-2 of the second power device Q2.

[0155] For example, Figure 4As shown, the first power device Q1 may include a first switching transistor 1 and a second switching transistor 2, which may be connected in anti-series. For example, the first end 1-1 of the first switching transistor 1 and the first end 2-1 of the second switching transistor 2 may be connected, that is, the output end of the first switching transistor 1 and the output end of the second switching transistor 2 are connected. The second end 1-2 of the first switching transistor 1 may serve as the first end Q1-1 of the first power device Q1, and the second end 2-2 of the second switching transistor 2 may serve as the second end Q1-2 of the first power device Q1. That is, the input end of the first switching transistor 1 may serve as the first end Q1-1 of the first power device Q1, and the input end of the second switching transistor 2 may serve as the second end Q1-2 of the first power device Q1.

[0156] The second power device Q2 is similar to the first power device Q1 and will not be described in detail here.

[0157] For example, Figure 4 As shown, and refer to Figure 2 In the first bridge arm 20-1, the first power device Q1 and the second power device Q2 are connected. When the first power device Q1 and the second power device Q2 both include a first switch tube 1 and a second switch tube 2, the second end 1-2 of the first switch tube 1 of the first power device Q1 is connected to the midpoint 13 of the bus capacitor branch 10, the second end 2-2 of the second switch tube 2 of the first power device Q1 is connected to the second end 1-2 of the first switch tube 1 of the second power device Q2, and the second end 2-2 of the second switch tube 2 of the second power device Q2 is connected to the midpoint 13 of the bus capacitor branch 10.

[0158] For example, in the first power device Q1 and the second power device Q2, the first switch tube 1 and the second switch tube 2 can be connected in anti-series, so that the first switch tube 1 and the second switch tube 2 can be turned on or off at the same time in the circuit, meeting the current flow requirements of the clamping sub-circuit 20 in the discharge circuit (drive circuit 900) and the charging circuit of the charge and discharge circuit 1000, and providing higher reliability and stability.

[0159] In some embodiments, the first switch tube 1 and the second switch tube 2 include one of SiIGBT, SiMOSFET, SiC MOSFET and GaN HEMT.

[0160] Exemplarily, the first switch tube 1 and the second switch tube 2 may be of the same type. For example, the first switch tube 1 and the second switch tube 2 may both be Si (silicon) IGBTs (Insulated Gate Bipolar Transistors); the first switch tube 1 and the second switch tube 2 may both be Si (silicon) MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors); the first switch tube 1 and the second switch tube 2 may both be SiC (Silicon Carbide) MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors); the first switch tube 1 and the second switch tube 2 may both be GaN (Gallium Nitride) HEMTs (High Electron Mobility Transistors). This disclosure is not limited here.

[0161] In some embodiments, the first power device Q1 and the second power device Q2 may each include a power device with a small current rating.

[0162] For example, the clamping sub-circuit 20 can function by employing low-current power devices. Specifically, when the battery pack 2000 discharges the drive motor 3000, multiple low-current power devices connected in parallel can meet the circuit's high-current requirements, thereby improving the current conduction capability of the clamping sub-circuit 20. When charging the battery pack 2000, the power-frequency AC power from the external power source can be converted into high-frequency AC power by controlling the conduction or cutoff of multiple low-current power devices. Because low-current power devices have a faster response speed and a better signal-to-noise ratio, this configuration can significantly improve the response speed of the clamping sub-circuit 20, resulting in a higher sensitivity. This, in turn, can improve the response speed and sensitivity of the charge-discharge circuit 1000 that includes the clamping sub-circuit 20. Furthermore, the small size and simple structure of low-current power devices can reduce the integration level of the charge-discharge circuit 1000, increase the power density of the charge-discharge system, and significantly reduce production costs.

[0163] Power density refers to the maximum power that a battery pack can output divided by the weight or volume (or area) of the entire charging and discharging system, and is expressed in watts per kilogram or watts per liter.

[0164] For example, the power device with a small current rating may be a power device with a current rating of less than 200A.

[0165] In some embodiments, the current level of the power device in the clamping sub-circuit 20 is smaller than the current level of the power device in the second conversion sub-circuit 72 .

[0166] In some embodiments, as Figure 2 、 Figure 3 As shown, the generator 4000 includes a plurality of second windings 4001 ; the plurality of second windings 4001 are respectively connected to the midpoints of the plurality of fourth bridge arms 110 - 1 .

[0167] For example, Figure 2 、 Figure 3 As shown, the generator 4000 may include, for example, three second windings 4001 , and one second winding 4001 is connected to the midpoint of one fourth bridge arm 110 - 1 .

[0168] Illustratively, the AC power on the second winding 4001 of the generator 4000 is input into the third conversion sub-circuit 110 through the midpoint of the fourth bridge arm 110 - 1 . The third conversion sub-circuit 110 converts the received AC power into DC power and then charges the battery pack 2000 .

[0169] In some embodiments, the present disclosure further provides a charging and discharging system, which includes a battery pack 2000, a charging and discharging circuit 1000 connected to the battery pack 2000 as described in some of the above embodiments, and a driving motor 3000 connected to the charging and discharging circuit 1000.

[0170] For example, referring to Figure 1 、 Figure 2 、 Figure 3 As shown, the charge and discharge system may include the charge and discharge circuit 1000 described in some of the above embodiments, and the charge and discharge circuit 1000 is connected to the battery pack 2000 and the drive motor 3000.

[0171] For example, Figure 5 As shown, and refer to Figure 1 、 Figure 2 、 Figure 3When the charge-discharge system is in the charging mode, the first and second switch subcircuits 40 and 50 are off, while the third and fourth switch subcircuits 80 and 90 are on. Specifically, the first switch K1, the second switch K2, and the three third switches K3 are off, while the fourth switch K4, the fifth switch K5, and the three sixth switches K6 are closed. This allows the charging circuit of the charge-discharge circuit 1000 to be conductive and the discharging circuit of the charge-discharge circuit 1000 to be closed. By controlling the on / off switching of the multiple first power devices Q1 and the multiple second power devices Q2 in the clamping subcircuit 20, and the multiple fifth power devices Q5 and the multiple sixth power devices Q6 in the second conversion subcircuit 72, the AC power from the external power source can be rectified into DC power, enabling the external power source to charge the battery pack 2000.

[0172] Specifically, Figure 6A 、 Figure 6B As shown, Figure 6B In the figure, the fourth switch K4, the fifth switch K5 and the three sixth switches K6 are closed, the first switch K1, the second switch K2 and the three third switches K3 are opened, and the charging circuit is turned on. After the external power supply is connected to the charging port 60, the industrial frequency AC power of the external power supply is input to the filter 100 through the charging port 60; after the industrial frequency AC power is filtered by the filter 100 (to stabilize the power supply voltage and suppress electromagnetic interference), it is input to the clamping sub-circuit 20. By controlling the switching actions of the multiple first power devices Q1 and the multiple second power devices Q2 in the clamping sub-circuit 20, the industrial frequency AC power of the external power supply provided by the charging port 60 is converted into high-frequency AC power, achieving efficient power conversion and current waveform optimization, optimizing the input current waveform, improving the power factor, and reducing harmonic interference; clamping The sub-circuit 20 inputs the converted high-frequency AC power into the isolation transformer 71 of the rectifier sub-circuit 70. The isolation transformer 71 can separate the circuit into two parts through electrical and physical methods to prevent direct current flow between the input and the output; the isolation transformer 71 inputs the high-frequency AC power into the second conversion sub-circuit 72 of the rectifier sub-circuit 70, and converts the high-frequency AC power into the DC power required by the battery pack 2000 by controlling the switching actions of the multiple fifth power devices Q5 and the multiple sixth power devices Q6 in the second conversion sub-circuit 72, thereby charging the battery pack 2000.

[0173] For example, Figure 5 As shown, and refer to Figure 1 、 Figure 2 、 Figure 3When the charge-discharge system is in the discharge mode, the first and second switch sub-circuits 40 and 50 are turned on, while the third and fourth switch sub-circuits 80 and 90 are turned off. Specifically, the first switch K1, the second switch K2, and the three third switches K3 are closed, while the fourth switch K4, the fifth switch K5, and the three sixth switches K6 are opened. This allows the discharge loop of the charge-discharge circuit 1000 to be turned on, while the charge loop of the charge-discharge circuit 1000 is turned off. By controlling the on / off of the multiple first power devices Q1 and the multiple second power devices Q2 in the clamping sub-circuit 20, and the multiple third power devices Q3 and the multiple fourth power devices Q4 in the first conversion sub-circuit 30, the DC power of the battery pack 2000 can be inverted into the three-level AC power required by the drive motor 3000, thereby controlling the drive motor 3000.

[0174] Specifically, Figure 7A 、 Figure 7B As shown, Figure 7B In the embodiment, the first switch K1, the second switch K2, and the three third switches K3 are closed, and the fourth switch K4, the fifth switch K5, and the three sixth switches K6 are open, thus opening the discharge circuit. After the DC power from the battery pack 2000 is input into the bus capacitor branch 10, the bus capacitor branch 10 clamps the voltage on the DC bus to three levels: positive, zero, and negative. The bus capacitor branch 10 then inputs these three voltage levels into the first conversion sub-circuit 30, enabling three-level access to the first conversion sub-circuit 30. By controlling the switching actions of the multiple third power devices Q3 and the multiple fourth power devices Q4 in the first conversion sub-circuit 30, the level and frequency of the DC power input to the first conversion sub-circuit 30 can be changed, thereby converting the three-level DC power input to the first conversion sub-circuit 30 into three-level AC power. The three-level AC power has a waveform closer to a sine wave, effectively reducing harmonic content and optimizing electromagnetic interference performance. By controlling the switching actions of the plurality of first power devices Q1 and the plurality of second power devices Q2 in the clamping sub-circuit 20 , the voltage at the midpoint 13 of the bus capacitor branch 10 is stabilized.

[0175] In some embodiments, as Figure 6A 、 Figure 7A As shown, the charge and discharge system further includes a controller 5000 , which is connected to the charge and discharge circuit 1000 . The controller 5000 is configured to sample the operation data of the charge and discharge circuit 1000 and control the operation of the charge and discharge circuit 1000 according to the sampling result.

[0176] For example, Figure 6A 、 Figure 6BAs shown, when the charge-discharge system is in the charging operation mode, the controller 5000 can sample the AC voltage and AC current of the external power supply, the port current of the clamping sub-circuit 20, and the output current and voltage of the second conversion sub-circuit 72, and compare the sampled data with the required power factor reference value, bus voltage reference value, charging current reference value, etc. in real time, and calculate the duty cycle and phase of the drive signals of the clamping sub-circuit 20 and the second conversion sub-circuit 72, so that the controller 5000 can accurately control the switching actions of the multiple first power devices Q1 and the multiple second power devices Q2 in the clamping sub-circuit 20, and control the switching actions of the multiple fifth power devices Q5 and the multiple sixth power devices Q6 in the second conversion sub-circuit 72, control the charging current amplitude of the battery pack 2000 in real time, and ensure the stability of the bus voltage and a high power factor, so as to realize the charging of the battery pack 2000.

[0177] For example, Figure 7A 、 Figure 7B As shown, when the charge and discharge system is in the discharge operation mode, the controller 5000 can sample the bus voltage of the first conversion sub-circuit 30, the power module temperature, the three-phase winding current of the drive motor 3000, and the rotor position of the drive motor 3000, and combine the sampled data with the operating parameters such as the speed of the drive motor 3000, and use the following method: Figure 8 The three-level space vector pulse width modulation strategy shown generates a nearly sinusoidal voltage or current by rationally switching the on / off states of the power devices, thereby driving the drive motor 3000 to operate, achieving three-level AC modulation capability, and reducing the switching loss, common-mode voltage, and output current harmonics of the charging and discharging system.

[0178] In some embodiments, as Figure 9 As shown, when the battery pack 2000 discharges the drive motor 3000, the controller 5000 selects to adopt the three-level vector modulation mode or the partial vector modulation mode according to the sampling result.

[0179] Exemplarily, the controller 5000 includes a three-level vector modulation mode and a partial vector modulation mode; the controller 5000 can select which modulation mode to adopt according to the sampling result.

[0180] For example, after the controller 5000 samples information such as the bus voltage, bus current, power module temperature, three-phase winding current of the drive motor 3000, and rotor position of the drive motor 3000, the sampled data is combined with the operating parameters of the drive motor 3000, such as the speed and torque, and according to the comprehensive efficiency and working characteristics of the charging and discharging system, through the motor closed-loop control strategy and operating condition identification algorithm, it is selected to adopt a three-level vector modulation mode or a partial vector modulation mode to achieve the optimization of the comprehensive efficiency of the charging and discharging system.

[0181] The motor closed-loop control strategy can monitor and adjust the operating status of the drive motor 3000 in real time to ensure that the drive motor 3000 operates at the expected speed and performance. The motor closed-loop control strategy compares the actual output of the drive motor 3000 with the expected output and dynamically adjusts based on the difference.

[0182] For example, according to the selected vector modulation mode, the SVPWM modulation program is used to make the PWM (pulse width modulation) generating circuit generate a PWM signal, and the PWM signal is transmitted to the charging and discharging system to adjust the switching state of the power device in the charging and discharging circuit 1000 to realize the driving of the drive motor 3000.

[0183] For example, by adjusting the duty cycle of the PWM signal, the switching behavior of the multiple third power devices Q3 and the multiple fourth power devices Q4 in the first conversion sub-circuit 30 of the charge-discharge circuit 1000 can be controlled, thereby changing the level and frequency of the DC power input to the first conversion sub-circuit 30. This allows the three-level DC power input to the first conversion sub-circuit 30 to be converted into a three-level AC power. The three-level AC power has a waveform closer to a sine wave, effectively reducing harmonic content and optimizing electromagnetic interference performance. Furthermore, by adjusting the duty cycle of the PWM signal, the switching behavior of the multiple first power devices Q1 and the multiple second power devices Q2 in the clamping sub-circuit 20 can be controlled to stabilize the voltage at the midpoint 13 of the bus capacitor branch 10.

[0184] The PWM generating circuit is a circuit that generates PWM signals. The PWM signal is an analog signal output in pulses. The PWM signal can control the switching state of the device by adjusting the duty cycle, thereby achieving fine control of the working state of the device.

[0185] In some embodiments, a driving system is provided, which includes a battery pack 2000 , a driving circuit 900 connected to the battery pack 2000 as described in some of the above embodiments, and a driving motor 3000 connected to the driving circuit 900 .

[0186] In some embodiments, the driving system further includes a controller, which is connected to the driving circuit 900 and configured to sample operating data of the driving circuit 900 and control the operation of the driving circuit 900 according to the sampling result.

[0187] In some embodiments, when the battery pack 2000 discharges the drive motor 3000 , the controller selects to use the three-level vector modulation mode or the partial vector modulation mode according to the sampling result.

[0188] For example, the structure and modulation method of the controller in the driving system are detailed in the introduction to the controller in the above-mentioned charging and discharging system, and will not be repeated here.

[0189] In some embodiments, the present disclosure provides a vehicle, which includes the driving circuit as described in some of the above embodiments, or includes the charging and discharging circuit as described in some of the above embodiments, or includes the driving system as described in some of the above embodiments, or includes the charging and discharging system as described in some of the above embodiments.

[0190] In the description of the embodiments of this application, specific features, structures, materials, or characteristics may be combined in any appropriate manner in any one or more embodiments or examples. The above are only specific implementation methods of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art who can easily conceive of changes or substitutions within the technical scope disclosed in this application shall be covered by the scope of protection of this application.

Claims

1. A driving circuit (900), characterized in that: include: A busbar capacitor branch (10) adapted to be connected between a first pole (2001) and a second pole (2002) of a battery pack (2000); a first conversion subcircuit (30), adapted to be connected to the drive motor (3000); the first conversion subcircuit (30) is configured to convert direct current into alternating current to provide to the drive motor (3000); and a clamping subcircuit (20), wherein a first end (21) and a second end (22) of the clamping subcircuit (20) are respectively connected to a midpoint (13) of the busbar capacitor branch (10), and a third end (23) of the clamping subcircuit (20) is connected to the first conversion subcircuit (30); The power devices in the clamping subcircuit (20) and the first conversion subcircuit (30) are different.

2. The driving circuit (900) according to claim 1, characterized in that The clamping subcircuit (20) comprises a plurality of first bridge arms (20-1), wherein the first ends (20-11) of the plurality of first bridge arms (20-1) are connected to the first end (21) of the clamping subcircuit (20); the second ends (20-12) of the plurality of first bridge arms (20-1) are connected to the second end (22) of the clamping subcircuit (20); and the midpoints of the plurality of first bridge arms (20-1) serve as the third ends (23) of the clamping subcircuit (20).

3. The driving circuit (900) according to claim 2, characterized in that The first bridge arm (20-1) comprises a first power device (Q1) and a second power device (Q2), wherein a first end (Q1-1) of the first power device (Q1) serves as a first end (20-11) of the first bridge arm (20-1), a second end (Q1-2) of the first power device (Q1) is connected to a first end (Q2-1) of the second power device (Q2), and a second end (Q2-2) of the second power device (Q2) serves as a second end (20-12) of the first bridge arm (20-1); The connection endpoint of the first power device (Q1) and the second power device (Q2) serves as the midpoint of the first bridge arm (20-1).

4. The driving circuit (900) according to claim 3, characterized in that The first power device (Q1) and the second power device (Q2) both comprise bidirectional power devices.

5. The driving circuit (900) according to claim 3, characterized in that The first power device (Q1) and the second power device (Q2) both comprise a first switching tube (1) and a second switching tube (2); a first end (1-1) of the first switching tube (1) and a first end (2-1) of the second switching tube (2) are connected; a second end (1-2) of the first switching tube (1) serves as the first end (Q1-1) of the first power device (Q1) or the first end (Q2-1) of the second power device (Q2); and a second end (2-2) of the second switching tube (2) serves as the second end (Q1-2) of the first power device (Q1) or the second end (Q2-2) of the second power device (Q2).

6. The driving circuit (900) according to claim 5, characterized in that The first switch tube (1) and the second switch tube (2) include one of SiIGBT, SiMOSFET, SiC MOSFET and GaN HEMT.

7. The driving circuit (900) according to claim 2, characterized in that The driving circuit (900) further comprises a first switch subcircuit (40), wherein a first end (41) of the first switch subcircuit (40) is connected to first ends (20-11) of a plurality of first bridge arms (20-1); a second end (42) of the first switch subcircuit (40) is connected to second ends (20-12) of a plurality of first bridge arms (20-1); and a third end (43) of the first switch subcircuit (40) is connected to a midpoint (13) of the busbar capacitor branch (10); The first switch subcircuit (40) is configured to be turned on when the battery pack (2000) discharges the drive motor (3000); and to be turned off when the battery pack (2000) is charged.

8. The driving circuit (900) according to claim 7, characterized in that The first switch subcircuit (40) comprises: A first switch (K1), wherein the first ends (20-11) of the plurality of first bridge arms (20-1) are connected to the midpoint (13) of the busbar capacitor branch (10) via the first switch (K1); A second switch (K2), wherein the second ends (20-12) of the plurality of first bridge arms (20-1) are connected to the midpoint (13) of the busbar capacitor branch (10) through the second switch (K2).

9. The driving circuit (900) according to claim 2, characterized in that The first conversion subcircuit (30) comprises a plurality of second bridge arms (30-1), wherein the first ends (30-11) of the plurality of second bridge arms (30-1) are connected to the first pole (2001) of the battery pack (2000); the second ends (30-12) of the plurality of second bridge arms (30-1) are connected to the second pole (2002) of the battery pack (2000); the midpoints of the plurality of second bridge arms (30-1) are respectively connected to the midpoints of the plurality of first bridge arms (20-1), and the midpoints of the plurality of second bridge arms (30-1) are also connected to the drive motor (3000).

10. The driving circuit (900) according to claim 9, characterized in that: The second bridge arm (30-1) comprises a third power device (Q3) and a fourth power device (Q4); the first end (Q3-1) of the third power device (Q3) serves as the first end (30-11) of the second bridge arm (30-1); the second end (Q3-2) of the third power device (Q3) is connected to the first end (Q4-1) of the fourth power device (Q4); and the second end (Q4-2) of the fourth power device (Q4) serves as the second end (30-12) of the second bridge arm (30-1); The connection endpoint of the third power device (Q3) and the fourth power device (Q4) serves as the midpoint of the second bridge arm (30-1).

11. The driving circuit (900) according to claim 9, characterized in that: The driving circuit (900) further comprises a second switch subcircuit (50), wherein a first end (51) of the second switch subcircuit (50) is connected to the midpoints of the plurality of first bridge arms (20-1); and a second end (52) of the second switch subcircuit (50) is connected to the midpoints of the plurality of second bridge arms (30-1). The second switch subcircuit (50) is configured to be turned on when the battery pack (2000) discharges the drive motor (3000); and to be turned off when the battery pack (2000) is charged.

12. The driving circuit (900) according to claim 11, characterized in that The second switch subcircuit (50) includes a plurality of third switches (K3), and the midpoint of the first bridge arm (20-1) is connected to the midpoint of the second bridge arm (30-1) through the third switches (K3).

13. The driving circuit (900) according to any one of claims 1 to 12, characterized in that: The current level of the power device in the clamping subcircuit (20) is smaller than the current level of the power device in the first conversion subcircuit (30).

14. The driving circuit (900) according to any one of claims 1 to 12, characterized in that: The driving circuit (900) further includes: a third conversion subcircuit (110), wherein a first end (111) of the third conversion subcircuit (110) is connected to a first pole (2001) of the battery pack (2000); a second end (112) of the third conversion subcircuit (110) is connected to a second pole (2002) of the battery pack (2000); and a third end (113) of the third conversion subcircuit (110) is connected to a generator (4000); The third conversion subcircuit (110) is configured to convert the alternating current output by the generator (4000) into direct current to charge the battery pack (2000).

15. The driving circuit (900) according to claim 14, characterized in that The third conversion subcircuit (110) comprises a plurality of fourth bridge arms (110-1), wherein the first ends (110-11) of the plurality of fourth bridge arms (110-1) are connected to the first end (111) of the third conversion subcircuit (110); the second ends (110-12) of the plurality of fourth bridge arms (110-1) are connected to the second end (112) of the third conversion subcircuit (110); and the midpoints of the plurality of fourth bridge arms (110-1) serve as the third ends (113) of the third conversion subcircuit (110).

16. The driving circuit (900) according to claim 15, characterized in that The fourth bridge arm (110-1) comprises a seventh power device (Q7) and an eighth power device (Q8), the first end of the seventh power device (Q7) serves as the first end (110-11) of the fourth bridge arm (110-1), the second end of the seventh power device (Q7) is connected to the first end of the eighth power device (Q8), and the second end of the eighth power device (Q8) serves as the second end (110-12) of the fourth bridge arm (110-1); The connection endpoint of the seventh power device (Q7) and the eighth power device (Q8) serves as the midpoint of the fourth bridge arm (110-1).

17. The driving circuit (900) according to claim 14, characterized in that The current level of the power device in the clamping subcircuit (20) is smaller than the current level of the power device in the third conversion subcircuit (110).

18. A charge-discharge circuit (1000), characterized in that: include: The driving circuit (900) according to any one of claims 1 to 17; a charging port (60), the charging port (60) being connected to the third terminal (23) of the clamping subcircuit (20); A rectifier circuit (70) is connected to the first end (21) and the second end (22) of the clamping subcircuit (20), and the rectifier circuit (70) is suitable for connecting to a battery pack (2000); the rectifier circuit (70) is configured to convert alternating current into direct current to charge the battery pack (2000).

19. The charge-discharge circuit (1000) according to claim 18, characterized in that: The clamping subcircuit (20) includes a plurality of first bridge arms (20-1); the charging port (60) includes a plurality of first ports (L1), and the plurality of first ports (L1) are respectively connected to the midpoints of the plurality of first bridge arms (20-1).

20. The charge-discharge circuit (1000) according to claim 18, characterized in that: The rectifier circuit (70) comprises: An isolation transformer (71), wherein a first end (711) of the isolation transformer (71) is connected to a first end (21) of the clamping sub-circuit (20), and a second end (712) of the isolation transformer (71) is connected to a second end (22) of the clamping sub-circuit (20).

21. The charge-discharge circuit (1000) according to claim 20, characterized in that: The rectifier circuit (70) further includes: A second conversion subcircuit (72), wherein a first end (721) of the second conversion subcircuit (72) is connected to a first pole (2001) of the battery pack (2000); a second end (722) of the second conversion subcircuit (72) is connected to a second pole (2002) of the battery pack (2000); and a third end (723) of the second conversion subcircuit (72) is connected to a third end (713) and a fourth end (714) of the isolation transformer (71).

22. The charge-discharge circuit (1000) according to claim 21, characterized in that: The second conversion subcircuit (72) comprises two third bridge arms (72-1), wherein a first end (72-11) of the third bridge arm (72-1) is connected to a first end (721) of the second conversion subcircuit (72), and a second end (72-12) of the third bridge arm (72-1) is connected to a second end (722) of the second conversion subcircuit (72); midpoints of the two third bridge arms (72-1) serve as third ends (723) of the second conversion subcircuit (72), and midpoints of the two third bridge arms (72-1) are connected to a third end (713) and a fourth end (714) of the isolation transformer (71), respectively.

23. The charge-discharge circuit (1000) according to claim 22, characterized in that: The third bridge arm (72-1) includes a fifth power device (Q5) and a sixth power device (Q6), the first end of the fifth power device (Q5) serves as the first end (72-11) of the third bridge arm (72-1), the second end of the fifth power device (Q5) is connected to the first end of the sixth power device (Q6), and the second end of the sixth power device (Q6) serves as the second end (72-12) of the third bridge arm (72-1); The connection point of the fifth power device (Q5) and the sixth power device (Q6) serves as the midpoint of the third bridge arm (72-1).

24. The charge-discharge circuit (1000) according to claim 20, characterized in that: The clamping subcircuit (20) includes a plurality of first bridge arms (20-1); the charging and discharging circuit (1000) further includes a third switch subcircuit (80); a first end (81) of the third switch subcircuit (80) is connected to the first ends (20-11) and the second ends (20-12) of the plurality of first bridge arms (20-1); and a second end (82) of the third switch subcircuit (80) is connected to the first end (711) and the second end (712) of the isolation transformer (71); The third switch subcircuit (80) is configured to be turned off when the battery pack (2000) discharges the drive motor (3000); and turned on when the battery pack (2000) is charged.

25. The charge-discharge circuit (1000) according to claim 24, characterized in that: The third switch subcircuit (80) comprises: a fourth switch (K4), wherein the first end (711) of the isolation transformer (71) is connected to the first ends (20-11) of the plurality of first bridge arms (20-1) via the fourth switch (K4); A fifth switch (K5), wherein the second end (712) of the isolation transformer (71) is connected to the second ends (20-12) of the plurality of first bridge arms (20-1) via the fifth switch (K5).

26. The charge-discharge circuit (1000) according to claim 19, characterized in that: The charging and discharging circuit (1000) further includes a fourth switch subcircuit (90), wherein a first end (91) of the fourth switch subcircuit (90) is connected to the charging port (60), and a second end (92) of the fourth switch subcircuit (90) is connected to the midpoints of the plurality of first bridge arms (20-1); The fourth switch subcircuit (90) is configured to be turned off when the battery pack (2000) discharges the drive motor (3000); and turned on when the battery pack (2000) is charged.

27. The charge-discharge circuit (1000) according to claim 26, characterized in that: The fourth switch subcircuit (90) includes a plurality of sixth switches (K6), and the first port (L1) of the charging port (60) is connected to the midpoint of the first bridge arm (20-1) via the sixth switches (K6).

28. The charge-discharge circuit (1000) according to claim 21, characterized in that: The rectifier circuit (70) further includes: A first capacitor (C3) is connected between a first pole (2001) and a second pole (2002) of the battery pack (2000), and is also connected between a first end (721) and a second end (722) of the second conversion subcircuit (72).

29. The charge-discharge circuit (1000) according to claim 18, characterized in that: The charge and discharge circuit (1000) further includes: A filter (100), wherein a first end of the filter (100) is connected to the charging port (60), and a second end of the filter (100) is connected to a third end (23) of the clamping subcircuit (20).

30. The charge-discharge circuit (1000) according to claim 21, characterized in that: The current level of the power device in the clamping subcircuit (20) is smaller than the current level of the power device in the second conversion subcircuit (72).

31. A drive system, characterized in that: include: Battery Pack (2000); A drive circuit (900) according to any one of claims 1 to 17, connected to the battery pack (2000); A driving motor (3000) connected to the driving circuit (900).

32. The drive system according to claim 31, wherein: The drive system further comprises: A controller (5000) is connected to the drive circuit (900), and the controller (5000) is configured to sample operating data of the drive circuit (900) and control the operation of the drive circuit (900) according to the sampling result.

33. The drive system according to claim 32, wherein: When the battery pack (2000) discharges the drive motor (3000), the controller (5000) selects to adopt a three-level vector modulation mode or a partial vector modulation mode according to a sampling result.

34. A charging and discharging system, characterized in that: include: Battery Pack (2000); A charge and discharge circuit (1000) according to any one of claims 18 to 30, connected to the battery pack (2000); A driving motor (3000) connected to the charging and discharging circuit (1000).

35. The charge and discharge system according to claim 34, characterized in that: The charging and discharging system further comprises: A controller (5000) is connected to the charge-discharge circuit (1000), and the controller (5000) is configured to sample operating data of the charge-discharge circuit (1000) and control the operation of the charge-discharge circuit (1000) according to the sampling result.

36. A vehicle, characterized in that: The vehicle comprises the drive circuit (900) according to any one of claims 1 to 17, or the charge and discharge circuit (1000) according to any one of claims 18 to 30, or the drive system according to any one of claims 31 to 33, or the charge and discharge system according to any one of claims 34 to 35.

Images