Integrated drive charging circuit and vehicle

Abstract

The embodiment of the application discloses an integrated driving charging circuit and a vehicle, wherein the integrated driving charging circuit comprises a voltage conversion module, a first switch module and a second switch module, the voltage conversion module is connected with the first switch module, the second switch module, an alternating current rectification module and an electric control motor module respectively, and a power battery pack module is connected with the first switch module and the second switch module respectively. By using the application, the charging circuit and the driving circuit can be integrated, the charging work and the driving work can be realized, the use of circuit components is reduced, and the overall cost of the vehicle is reduced.

Description

Technical Field

[0001] This application relates to the field of electronic technology, specifically to an integrated drive charging circuit and a vehicle. Background Technology

[0002] Currently, electric vehicles (EVs) require an internal charging circuit to input the voltage from the charging station into the EV's battery for charging. When driving, the EV's internal drive circuit uses the battery's voltage to power the electric motor. Since EVs operate at different times—DC charging, AC charging, and driving—and each uses its own dedicated circuit, designing multiple independent circuits results in excessive circuitry and increases the overall cost of the vehicle.

[0003] Application content

[0004] This application provides an integrated drive and charging circuit and vehicle, which can combine and reuse the charging circuit and the drive circuit to realize DC charging, AC charging and driving operations, reduce the use of circuit components and reduce the overall cost of the vehicle.

[0005] In a first aspect, embodiments of this application provide an integrated drive charging circuit, including a voltage conversion module, a first switch module, and a second switch module. The voltage conversion module is connected to the first switch module, the second switch module, an AC rectifier module, and an electric motor module, respectively. The power battery pack module is connected to the first switch module and the second switch module, respectively.

[0006] When in driving mode, the first switch module is in the closed state and the second switch module is in the open state. The voltage conversion module is in the first mode, which boosts the voltage output by the power battery pack module to the voltage required by the electric motor module to supply power to the electric motor module, which provides driving power to the vehicle.

[0007] When in AC charging mode, the first switch module is in the off state and the second switch module is in the closed state, and the voltage conversion module is in the second mode. The voltage conversion module and the second switch module constitute a first AC charging circuit. Alternatively, the first switch module is in the closed state and the second switch module is in the off state, and the voltage conversion module is in the second mode. The voltage conversion module and the first switch module constitute a second AC charging circuit. The DC voltage output by the AC rectifier module is converted into the DC voltage required by the power battery pack module through the first AC charging circuit or the second AC charging circuit to charge the power battery pack module.

[0008] In one optional implementation, the voltage conversion module includes a transformer module, a first bridge arm module, a second bridge arm module, a third switch module, an inductor, a first capacitor, and a second capacitor.

[0009] The transformer module, the third switch module, the second capacitor, and the inductor are connected in series to form a first series circuit. The first series circuit is connected to the second bridge arm module, and the first bridge arm module is connected to the transformer module and the first capacitor respectively.

[0010] In one optional embodiment, the transformer module includes a first transformer primary side, a second transformer primary side, a first transformer secondary side, and a second transformer secondary side; the first bridge arm module includes a first switch, a second switch, a third switch, and a fourth switch; and the second bridge arm module includes a fifth switch, a sixth switch, a seventh switch, and an eighth switch.

[0011] The primary side of the first transformer, the primary side of the second transformer, the third switch module, the inductor, and the second capacitor are connected in series to form a second series circuit. One end of the second series circuit is connected to one end of the fifth switch and one end of the sixth switch, and the other end of the second series circuit is connected to one end of the seventh switch and one end of the eighth switch, with the other end of the fifth switch connected to the other end of the seventh switch and the other end of the sixth switch connected to the other end of the eighth switch.

[0012] The positive terminal of the power battery pack module is connected to one end of the first switch module and one end of the second switch module. The other end of the first switch module, one end of the secondary side of the first transformer, and one end of the secondary side of the second transformer are interconnected. The other end of the second switch module is connected to the other end of the first switch tube. The other end of the secondary side of the first transformer is connected to one end of the first switch tube and one end of the second switch tube. The other end of the secondary side of the second transformer is connected to one end of the third switch tube and one end of the fourth switch tube. The other end of the first switch tube is connected to the other end of the third switch tube. The other end of the second switch tube is connected to the other end of the fourth switch tube and the negative terminal of the power battery pack module. One end of the first capacitor is connected to the other end of the third switch tube, and the other end of the first capacitor is connected to the other end of the fourth switch tube.

[0013] In one optional implementation, one end of the DC charging port module, the other end of the first switch module, one end of the secondary side of the first transformer, and one end of the secondary side of the second transformer are interconnected, and the other end of the DC charging port module is connected to the negative terminal of the power battery pack module.

[0014] When in DC charging mode and the voltage output by the DC charging port module is less than the voltage required by the power battery pack module, the first switch module is in the open state, the second switch module is in the closed state and the third switch module is in the open state. The voltage conversion module is in the third mode. The DC charging circuit composed of the second switch module and the voltage conversion module boosts the DC voltage output by the DC charging port module to the DC voltage required by the power battery pack module, so as to perform boost DC charging on the power battery pack module.

[0015] When in DC charging mode and the voltage output by the DC charging port module is greater than or equal to the voltage required by the power battery pack module, the first switch module is in a closed state, the second switch module is in a closed state, and the third switch module is in a closed state, so as to provide the DC voltage output by the DC charging port module to the power battery pack module for direct DC charging of the power battery pack module.

[0016] In one optional embodiment, the AC rectifier module includes a third capacitor, a charging port, and a power factor corrector. The output terminal of the charging port is connected to the input terminal of the power factor corrector. One end of the third capacitor is connected to one end of the power factor corrector and the other end of the seventh switching transistor. The other end of the third capacitor is connected to the other end of the power factor corrector and the other end of the eighth switching transistor. The power factor corrector is used to convert the AC voltage output from the charging port into a DC voltage.

[0017] In one optional implementation, the electric motor module includes an electric controller and a motor, wherein the output terminal of the electric controller is connected to the input terminal of the motor;

[0018] One end of the electronic control unit is connected to one end of the first capacitor, and the other end of the electronic control unit is connected to the other end of the first capacitor. The electronic control unit is used to convert the DC voltage output by the power battery pack module into AC voltage to power the motor.

[0019] In one optional implementation, when the voltage conversion module is in the first mode, the third switching module is in the off state;

[0020] The secondary side of the first transformer, the first switching transistor, and the second switching transistor constitute a first boost circuit, and the secondary side of the second transformer, the third switching transistor, and the fourth switching transistor constitute a second boost circuit.

[0021] The voltage output by the power battery pack module is boosted to the voltage required by the electric motor module by the parallel or interleaved operation of the first boost circuit and the second boost circuit.

[0022] In one optional implementation, when the voltage conversion module is in the second mode, the third switch module is in the closed state;

[0023] The DC voltage output by the AC rectifier module is converted into the DC voltage required by the power battery pack module by the DC voltage converter formed by the voltage conversion module in the first AC charging circuit.

[0024] Alternatively, the DC voltage output by the AC rectifier module can be converted into the DC voltage required by the power battery pack module by a DC voltage converter formed by the voltage conversion module in the second AC charging circuit.

[0025] Secondly, embodiments of this application provide a control method for an integrated drive-charging circuit. The integrated drive-charging circuit includes a voltage conversion module, a first switch module, and a second switch module. The voltage conversion module is connected to the first switch module, the second switch module, an AC rectifier module, and an electric motor module. A power battery pack module is connected to the first switch module and the second switch module. The method includes:

[0026] When in driving mode, the first switch module is in the closed state and the second switch module is in the open state. The voltage conversion module is in the first mode, which boosts the voltage output by the power battery pack module to the voltage required by the electric motor module to supply power to the electric motor module, which provides driving power to the vehicle.

[0027] When in AC charging mode, the first switch module is controlled to be in the off state and the second switch module is controlled to be in the closed state, and the voltage conversion module is controlled to be in the second mode. The voltage conversion module and the second switch module constitute a first AC charging circuit. Alternatively, the first switch module is controlled to be in the closed state and the second switch module is controlled to be in the off state, and the voltage conversion module is controlled to be in the second mode. The voltage conversion module and the first switch module constitute a second AC charging circuit. The DC voltage output by the AC rectifier module is converted into the DC voltage required by the power battery pack module through the first AC charging circuit or the second AC charging circuit to charge the power battery pack module.

[0028] Thirdly, embodiments of this application provide an electronic device including the integrated drive charging circuit and controller described in the first aspect above. The controller is used to control the voltage conversion module to be in a first mode, a second mode, or a third mode, and to control the first switch module and the second switch module.

[0029] Fourthly, embodiments of this application provide a vehicle including the integrated drive charging circuit described in the first aspect.

[0030] Implementing the embodiments of this application has the following beneficial effects:

[0031] The integrated drive-charging circuit of this application integrates the charging circuit and the drive circuit. In drive mode, the voltage conversion module in the integrated drive-charging circuit is in a first mode, and the integrated drive-charging circuit performs drive operation. In AC charging mode, the voltage conversion module and the second switching module form a first AC charging circuit, or the voltage conversion module and the first switching module form a second AC charging circuit. The integrated drive-charging circuit performs charging operation through the first AC charging circuit or the second AC charging circuit. Using this integrated drive-charging circuit can realize drive operation, DC charging operation, and AC charging operation, thereby reducing the number of circuit components and lowering the overall cost of the vehicle. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a framework diagram of an integrated drive charging circuit provided in an embodiment of this application;

[0034] Figure 2 This is a schematic diagram of the structure of a voltage conversion module provided in an embodiment of this application;

[0035] Figure 3 This is a specific circuit diagram of an integrated drive charging circuit provided in an embodiment of this application;

[0036] Figure 4 This is a schematic diagram of the structure of a driving mode operating circuit provided in an embodiment of this application;

[0037] Figure 5 This is a schematic diagram of the structure of a DC charging mode operating circuit provided in an embodiment of this application;

[0038] Figure 6 This is a schematic diagram of another DC charging mode operating circuit provided in an embodiment of this application;

[0039] Figure 7 This is a schematic diagram of the structure of an AC charging mode working circuit provided in an embodiment of this application;

[0040] Figure 8 This is a schematic diagram of the structure of an AC charging mode positive half-cycle working circuit provided in an embodiment of this application;

[0041] Figure 9 This is a schematic diagram of the structure of an AC charging mode negative half-cycle working circuit provided in an embodiment of this application;

[0042] Figure 10 This is a schematic diagram of another AC charging mode operating circuit provided in an embodiment of this application;

[0043] Figure 11 This is a schematic diagram of another AC charging mode positive half-cycle working circuit provided in an embodiment of this application;

[0044] Figure 12 This is a schematic diagram of another AC charging mode negative half-cycle working circuit provided in the embodiments of this application. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] The terms "first," "second," "third," "fourth," "fifth," "sixth," "seventh," and "eighth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0047] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0048] It should be noted that in the subsequent embodiments of the present invention, the first switch is represented by the first switch Q1, the second switch by the second switch Q2, the third switch by the third switch Q3, the fourth switch by the fourth switch Q4, the fifth switch by the fifth switch Q5, the sixth switch by the sixth switch Q6, the seventh switch by the seventh switch Q7, and the eighth switch by the eighth switch Q8. The first switch module is represented by the first switch module S1, the second switch module by the second switch module S2, and the third switch module by the third switch module S3. The first capacitor is represented by the first capacitor C1, the second capacitor by the second capacitor C2, and the third capacitor by the third capacitor C3. The primary side of the first transformer is represented by the first transformer primary side L1, the primary side of the second transformer by the second transformer primary side L2, the secondary side of the first transformer is represented by the first transformer secondary side L3, the secondary side of the second transformer by the second transformer secondary side L4, and the inductor is represented by the inductor L.

[0049] Please see Figure 1 , Figure 1 This is a framework diagram of an integrated drive charging circuit provided in an embodiment of this application. Figure 1 As shown, the integrated drive charging circuit includes a voltage conversion module 104, a first switch module 102, and a second switch module 103. The voltage conversion module 104 is connected to the first switch module 102, the second switch module 103, the AC rectifier module 106, and the electric motor module 105, respectively. The power battery pack module 101 is connected to the first switch module 102 and the second switch module 103, respectively.

[0050] The power battery pack module 101 includes a power battery pack, and the electric motor module 105 includes an electric controller and a motor. The output terminal of the electric controller is connected to the input terminal of the motor. The electric controller is used to convert the DC voltage output by the power battery pack module 101 into AC voltage to power the motor.

[0051] The voltage conversion module 104 includes a transformer module, a first bridge arm module, a second bridge arm module, a third switch module, an inductor, a first capacitor, and a second capacitor; the AC rectification module 106 includes a third capacitor, a charging port, and a power factor corrector. The output terminal of the charging port is connected to the input terminal of the power factor corrector, which is used to convert the AC voltage output from the charging port into a DC voltage.

[0052] The first switch module 102, the second switch module 103 and the third switch module mentioned above include electronic components that can open the circuit, interrupt the current or allow it to flow to other circuits, and this application does not limit them.

[0053] When in driving mode, the first switch module 102 is closed and the second switch module 103 is open. The voltage conversion module 104 is in the first mode, which boosts the voltage output by the power battery pack module 101 to the voltage required by the electric motor module 105 to supply power to the electric motor module 105. The electric motor module 105 provides driving power to the vehicle.

[0054] When in AC charging mode, the first switch module 102 is in the off state and the second switch module 103 is in the closed state. The voltage conversion module 104 is in the second mode, and the voltage conversion module 104 and the second switch module 103 constitute a first AC charging circuit. Alternatively, the first switch module 102 is in the closed state and the second switch module 103 is in the off state. The voltage conversion module 104 is in the second mode, and the voltage conversion module 104 and the first switch module 102 constitute a second AC charging circuit. The DC voltage output by the AC rectifier module 106 is converted into the DC voltage required by the power battery pack module 101 through the first AC charging circuit or the second AC charging circuit to charge the power battery pack module 101.

[0055] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of a voltage conversion module provided in an embodiment of this application. For example... Figure 2 As shown, the voltage conversion module includes a transformer module, a first bridge arm module, a second bridge arm module, a third switch module S3, an inductor L, a first capacitor C1, and a second capacitor C2. The transformer module, the third switch module S3, the second capacitor C2, and the inductor L are connected in series to form a first series circuit. The first series circuit is connected to the second bridge arm module. The first bridge arm module is connected to the transformer module and the first capacitor C1.

[0056] The above-mentioned transformer module includes a first transformer primary side L1, a second transformer primary side L2, a first transformer secondary side L3, and a second transformer secondary side L4. The above-mentioned first bridge arm module includes a first switch Q1, a second switch Q2, a third switch Q3, and a fourth switch Q4. The above-mentioned second bridge arm module includes a fifth switch Q5, a sixth switch Q6, a seventh switch Q7, and an eighth switch Q8.

[0057] The primary winding of the first transformer L1, the primary winding of the second transformer L2, the third switch module S3, the inductor L, and the second capacitor C2 are connected in series to form a second series circuit. The series connection order of the primary winding of the first transformer L1, the primary winding of the second transformer L2, the third switch module S3, the inductor L, and the second capacitor C2 in the second series circuit can be arbitrarily combined, and this application does not limit this. One end of the second series circuit is connected to one end of the fifth switch Q5 and one end of the sixth switch Q6, respectively. The other end of the second series circuit is connected to one end of the seventh switch Q7 and one end of the eighth switch Q8, respectively. The other end of the fifth switch Q5 is connected to the other end of the seventh switch Q7, and the other end of the sixth switch Q6 is connected to the other end of the eighth switch Q8.

[0058] The positive terminal of the aforementioned power battery pack module is connected to one end of the first switch module S1 and one end of the second switch module S2, respectively. The other end of the first switch module S1, one end of the secondary side L3 of the first transformer, and one end of the secondary side L4 of the second transformer are interconnected. The other end of the second switch module S2 is connected to the other end of the first switch tube Q1. The other end of the secondary side L3 of the first transformer is connected to one end of the first switch tube Q1 and one end of the second switch tube Q2, respectively. The other end of the secondary side L4 of the second transformer is connected to one end of the third switch tube Q3 and one end of the fourth switch tube Q4, respectively. The other end of the first switch tube Q1 is connected to the other end of the third switch tube Q3. The other end of the second switch tube Q2 is connected to the other end of the fourth switch tube Q4 and the negative terminal of the power battery pack module, one end of the first capacitor C1 is connected to the other end of the third switch tube Q3, and the other end of the first capacitor C1 is connected to the other end of the fourth switch tube Q4.

[0059] Please see Figure 3 , Figure 3 This is a specific circuit diagram of an integrated drive and charging circuit provided in an embodiment of this application. For example... Figure 3 As shown, the integrated drive charging circuit includes a voltage conversion module, a first switch module S1 and a second switch module S2. The voltage conversion module is connected to the first switch module S1, the second switch module S2, the AC rectifier module and the electric motor module, respectively. The power battery pack module is connected to the first switch module S1 and the second switch module S2, respectively.

[0060] The voltage conversion module described above includes a first transformer primary side L1, a second transformer primary side L2, a first transformer secondary side L3, a second transformer secondary side L4, an inductor L, a third switching module S3, a first capacitor C1, a second capacitor C2, a first switch Q1, a second switch Q2, a third switch Q3, a fourth switch Q4, a fifth switch Q5, a sixth switch Q6, a seventh switch Q7, and an eighth switch Q8. For the connection details of the electronic components within the voltage conversion module, please refer to [link to documentation]. Figure 2 The schematic diagram of the voltage conversion module shown is omitted here.

[0061] The aforementioned electric motor module includes an electric controller and a motor. The output terminal of the electric controller is connected to the input terminal of the motor. One end of the electric controller is connected to one end of the first capacitor C1, and the other end of the electric controller is connected to the other end of the first capacitor C1. The electric controller is used to convert the DC voltage output by the power battery pack module into AC voltage to power the motor.

[0062] The aforementioned AC rectifier module includes a third capacitor C3, a power factor corrector, and a charging port. The power factor corrector can be an active PFC or a passive PFC. The output terminal of the charging port is connected to the input terminal of the power factor corrector. One end of the third capacitor C3 is connected to one end of the power factor corrector and the other end of the seventh switch Q7. The other end of the third capacitor C3 is connected to the other end of the power factor corrector and the other end of the eighth switch Q8. The power factor corrector is used to convert the AC voltage output from the charging port into a DC voltage.

[0063] The above Figure 3 The electronic component structure diagram of the power battery pack module shown is for illustrative purposes only and is not intended to limit the scope of this application.

[0064] In one possible implementation, one end of the DC charging port module, the other end of the first switch module S1, one end of the second side L3 of the first transformer, and one end of the second side L4 of the second transformer are interconnected, and the other end of the DC charging port module is connected to the negative terminal of the power battery pack module.

[0065] Please see Figure 4 , Figure 4 This is a schematic diagram of a driving mode operating circuit provided in an embodiment of this application.

[0066] When in drive mode, the first switch module S1 is closed, the second switch module S2 is open, and the third switch module S3 is also open. The voltage conversion module is in the first mode. At this time, the circuit containing the third switch module S3, including the primary winding of the first transformer L1, the primary winding of the second transformer L2, inductor L, the fifth switch Q5, the sixth switch Q6, the seventh switch Q7, the eighth switch Q8, the second capacitor C2, and the third capacitor C3, does not carry current. Figure 3 The integrated driver charging circuit shown is as follows: Figure 4 As shown, both the secondary windings of the first transformer (L3) and the second transformer (L4) function as inductors. The first transformer secondary winding (L3), the first switch (Q1), and the second switch (Q2) constitute a boost chopper circuit, which will be referred to as the first boost chopper circuit in the following description. The second transformer secondary winding (L4), the third switch (Q3), and the fourth switch (Q4) constitute another boost chopper circuit, which will be referred to as the second boost chopper circuit in the following description.

[0067] When boosting the DC voltage output from the power battery pack module using a boost chopper circuit, during the discharge of the power battery pack module, the first switch Q1 is turned off and the second switch Q2 is turned on. The input voltage flows through the secondary side L3 of the first transformer. Since the input is a DC voltage, the current on the secondary side L3 of the first transformer increases linearly at a certain rate, which is related to the inductance of the secondary side L3. As the inductor current increases, some energy is stored in the inductor. Then, the first switch Q1 is turned on and the second switch Q2 is turned off. Due to the current holding characteristic of the inductor, the current flowing through the secondary side L3 of the first transformer does not immediately become 0, but slowly becomes 0. The secondary side L3 of the first transformer begins to charge the first capacitor C1, and the voltage across the first capacitor C1 increases. At this time, the voltage is higher than the DC voltage output by the power battery pack module, achieving the boost effect. When using the first boost chopper circuit to boost the voltage, the switching processes of the first switch Q1 and the second switch Q2 are repeated continuously, so that a voltage higher than the DC voltage output by the power battery pack module can be obtained across the first capacitor C1.

[0068] When boosting the DC voltage output from the power battery pack module using the boost chopper circuit, during the discharge of the power battery pack module, the third switch Q3 is first turned off and the fourth switch Q4 is turned on. The input voltage flows through the secondary side L4 of the second transformer. Since the input is a DC voltage, the current on the secondary side L4 of the second transformer increases linearly at a certain rate, which is related to the inductance of the secondary side L4. As the inductor current increases, some energy is stored in the inductor. Then, the third switch Q3 is turned on and the fourth switch Q4 is turned off. Due to the current holding characteristic of the inductor, the current flowing through the secondary side L4 of the second transformer does not immediately become 0, but slowly becomes 0. The secondary side L4 of the second transformer begins to charge the first capacitor C1, and the voltage across the first capacitor C1 increases. At this time, the voltage is higher than the DC voltage output by the power battery pack module, achieving the boost effect. When using the second boost chopper circuit to boost the voltage, the switching processes of the third switch Q3 and the fourth switch Q4 are repeated continuously, so that a voltage higher than the DC voltage output by the power battery pack module can be obtained across the first capacitor C1.

[0069] When using the two boost chopper circuits described above for voltage boosting, the first and second boost chopper circuits can operate alternately in parallel or in a parallel configuration. For example, after the first boost chopper circuit performs one voltage boosting operation, the second boost chopper circuit performs another, and the two boost chopper circuits operate alternately. Alternatively, the first and second boost chopper circuits can operate simultaneously for voltage boosting.

[0070] After the voltage across the first capacitor C1 is higher than the DC voltage output by the power battery pack module, and the voltage reaches the input voltage of the electronic control, the electronic control converts the boosted DC voltage into AC voltage to drive the motor to work.

[0071] Please see Figure 5 , Figure 5 This is a schematic diagram of a DC charging mode operating circuit provided in an embodiment of this application.

[0072] When in DC charging mode and the output voltage of the DC charging port module is greater than or equal to the voltage required by the power battery pack module, the first switch module S1 is controlled to be closed, the second switch module S2 is controlled to be open, and the third switch module S3 is controlled to be open. Figure 3 The actual working circuit of the integrated drive charging circuit shown is as follows: Figure 5As shown, the DC voltage output by the DC charging port module is provided to the power battery pack module to directly charge the power battery pack module using DC.

[0073] Please see Figure 6 , Figure 6 This is a schematic diagram of another DC charging mode operating circuit provided in the embodiments of this application.

[0074] Understandably, when using a DC charging pile for charging, if the highest voltage output by the DC charging port module of the aforementioned DC charging pile is lower than the voltage required by the aforementioned power battery pack module, then DC boost charging is required to increase the output voltage of the aforementioned DC charging port module to the voltage required by the aforementioned power battery pack module.

[0075] When in DC charging mode and the voltage output by the DC charging port module is less than the voltage required by the power battery pack module, the first switch module S1 is controlled to be in the open state, the second switch module S2 is controlled to be in the closed state, and the third switch module S3 is controlled to be in the open state. The voltage conversion module is in the third mode. Figure 3 The actual working circuit of the integrated drive charging circuit shown is as follows: Figure 6 As shown. The circuit containing the third switch module S3 includes the primary side L1 of the first transformer, the primary side L2 of the second transformer, the inductor L, the fifth switch Q5, the sixth switch Q6, the seventh switch Q7, the eighth switch Q8, the second capacitor C2, and the third capacitor C3. Since no current flows through them, the secondary side L3 of the first transformer and the secondary side L4 of the second transformer both function as inductors.

[0076] The aforementioned first transformer secondary side L3, the aforementioned first switch Q1, and the aforementioned second switch Q2 constitute a boost chopper circuit, which will be referred to as a third boost chopper circuit in the following description. The aforementioned second transformer secondary side L4, the aforementioned third switch Q3, and the aforementioned fourth switch Q4 constitute another boost chopper circuit, which will be referred to as a fourth boost chopper circuit in the following description.

[0077] The working principles of the third and fourth boost chopper circuits mentioned above are the same as those of the first and second boost chopper circuits mentioned above, and will not be repeated here.

[0078] When using the two boost chopper circuits described above for voltage boosting, the third and fourth boost chopper circuits can operate alternately in parallel or in parallel. For example, after the third boost chopper circuit performs one voltage boosting operation, the fourth boost chopper circuit performs another voltage boosting operation, with the two boost chopper circuits operating alternately. Alternatively, the third and fourth boost chopper circuits can operate simultaneously for voltage boosting.

[0079] The DC voltage output by the DC charging port module is boosted to the voltage required by the power battery pack module by the parallel or interleaved operation of the third boost chopper circuit and the fourth boost chopper circuit, so as to perform boost DC charging on the power battery pack module.

[0080] When an AC charging command is detected, the first switch module S1 is in the open state and the second switch module S2 is in the closed state. The voltage conversion module is in the second mode, and the voltage conversion module and the second switch module S2 constitute a first AC charging circuit. Alternatively, the first switch module S1 is in the closed state and the second switch module S2 is in the open state. The voltage conversion module is in the second mode, and the voltage conversion module and the first switch module S1 constitute a second AC charging circuit. The DC voltage output by the AC rectifier module is converted into the DC voltage required by the power battery pack module through the first AC charging circuit or the second AC charging circuit to AC charge the power battery pack module.

[0081] The following explanation focuses on the charging operation of the first AC charging circuit. Please refer to [link / reference]. Figure 7 , Figure 7 This is a schematic diagram of the structure of an AC charging mode working circuit provided in an embodiment of this application.

[0082] By controlling the first switch module S1 to be in the open state, and controlling the second switch module S2 to be in the closed state, and controlling the third switch module S3 to be in the closed state, the voltage conversion module is in the second mode. In this mode, the secondary sides L3 and L4 of the first and second transformers are connected in series, forming a DC voltage conversion circuit together with the first, second, third, fourth, fifth, sixth, seventh, and eighth switches Q1, Q2, Q3, Q4, Q5, Q6, Q7, and Q8. The power factor correction device can be either active or passive PFC. The power factor correction device is used to convert the AC voltage output from the charging port into DC voltage.

[0083] The first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, the fifth switch Q5, the sixth switch Q6, the seventh switch Q7, and the eighth switch Q8 are turned off and on in a cyclical sequence to convert the DC voltage output by the power factor corrector into the voltage required by the power battery pack 501. When the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, the fifth switch Q5, the sixth switch Q6, the seventh switch Q7, and the eighth switch Q8 are turned off and on in a cyclical sequence, they operate in a positive half-cycle and a negative half-cycle.

[0084] During the positive half-cycle, the first switch Q2, the third switch Q3, the fifth switch Q5, and the eighth switch Q8 are simultaneously turned off, while the first switch Q1, the fourth switch Q4, the sixth switch Q6, and the seventh switch Q7 are simultaneously turned on. At this time, the aforementioned... Figure 7 The actual working circuit of the AC charging circuit shown is as follows: Figure 8 As shown. Please see below. Figure 8 , Figure 8 This is a schematic diagram of the positive half-cycle operating circuit for AC charging mode provided in an embodiment of this application. The current starts from the positive terminal of the power factor corrector, passes sequentially through the seventh switch Q7, the second capacitor C2, the third switch module S3, the primary side of the first transformer L1, the primary side of the second transformer L2, the inductor L, and the sixth switch Q6, finally returning to the negative terminal of the power factor corrector. For the above current flow, please refer to [link / reference needed]. Figure 8 The direction of the current flow is indicated by the solid arrow. Specifically, when the current flows through the primary windings L1 and L2 of the first and second transformers, due to the working principle of transformers, the voltages on the primary windings L1 and L2 are transferred to the secondary windings L3 and L4 of the first and second transformers. The current flow direction on the secondary windings L3 and L4 is opposite to that on the primary windings L1 and L2. Therefore, the current flow direction in the circuit containing the power battery pack module is as follows: sequentially passing through the secondary winding of the first transformer L3, the first switch Q1, the second switch module S2, the positive terminal of the power battery pack module, the negative terminal of the power battery pack module, the fourth switch Q4, and the secondary winding of the second transformer L4. For a detailed description of the current flow, please refer to [link to relevant documentation]. Figure 8 The direction indicated by the dashed arrow.

[0085] During the secondary half-cycle operation, the second switch Q2, the third switch Q3, the fifth switch Q5, and the eighth switch Q8 are simultaneously turned on, while the first switch Q1, the fourth switch Q4, the sixth switch Q6, and the seventh switch Q7 are simultaneously turned off. At this time, the aforementioned... Figure 7 The actual working circuit of the AC charging circuit shown is as follows: Figure 9 As shown. Please see below. Figure 9 , Figure 9 This is a schematic diagram of the negative half-cycle operating circuit in AC charging mode provided in an embodiment of this application. The current starts from the positive terminal of the power factor corrector, passes sequentially through the fifth switch Q5, inductor L, the primary side of the second transformer L2, the primary side of the first transformer L1, the third switch module S3, the second capacitor C2, and the eighth switch Q8, finally returning to the negative terminal of the power factor corrector. For the above current flow, please refer to [link / reference needed]. Figure 9 The direction of the solid arrow is shown. When current flows through the primary windings L1 and L2 of the first and second transformers, due to the working principle of transformers, the voltages on the primary windings L1 and L2 are transferred to the secondary windings L3 and L4 of the first and second transformers. The current flow direction on the secondary windings L3 and L4 is opposite to that on the primary windings L1 and L2. Therefore, the current flow direction in the circuit containing the power battery pack module is as follows: sequentially passing through the secondary winding of the second transformer L4, the third switch Q3, the second switch module S2, the positive terminal of the power battery pack module, the negative terminal of the power battery pack module, the second switch Q2, and the secondary winding of the first transformer L3. For the above current flow direction, please refer to [link to relevant documentation]. Figure 9 The direction indicated by the dashed arrow.

[0086] By alternating between the positive and negative half-cycles, the voltage output from the AC rectifier module is input to the power battery pack module to charge it.

[0087] The following explanation focuses on the charging operation of the second AC charging circuit. Please refer to [link / reference]. Figure 10 , Figure 10 This is a schematic diagram of another AC charging mode working circuit provided in the embodiments of this application.

[0088] The first switch module S1 is controlled to be closed, the second switch module S2 is controlled to be open, and the third switch module S3 is controlled to be closed. The voltage conversion module is in the second mode, turning off the first switch Q1 and the third switch Q3, and keeping them always off. At this time, no current flows through the circuit containing the electronic control unit and the motor; that is, neither the electronic control unit nor the motor works. Figure 3 The actual working circuit of the integrated drive charging circuit shown is as follows: Figure 10As shown. The aforementioned power factor correction unit can be either active or passive PFC, converting the AC voltage output from the charging port into a DC voltage. The fifth switch Q5, the sixth switch Q6, the seventh switch Q7, and the eighth switch Q8 are switched off and on in a cyclic sequence, transforming the input DC voltage into an AC voltage between the circuit's midpoints through a specific switching sequence. When the fifth switch Q5, the sixth switch Q6, the seventh switch Q7, and the eighth switch Q8 are switched off and on in a cyclic sequence, they operate in a positive half-cycle and a negative half-cycle.

[0089] During the positive half-cycle, the second switch Q2, the fifth switch Q5, and the eighth switch Q8 are simultaneously turned off, while the fourth switch Q4, the sixth switch Q6, and the seventh switch Q7 are simultaneously turned on. At this time, the aforementioned... Figure 10 The actual working circuit of the charging circuit shown is as follows: Figure 11 As shown. Please see below. Figure 11 The schematic diagram of the charging mode positive half-cycle circuit shows that the current starts from the positive terminal of the power factor corrector, passes sequentially through the seventh switch Q7, the second capacitor C2, the third switch module S3, the primary side of the first transformer L1, the primary side of the second transformer L2, the inductor L, the sixth switch Q6, and finally returns to the negative terminal of the power factor corrector. Please refer to [link to previous diagram] for the above current flow. Figure 11 The solid arrow indicates the direction of the current flow. When the current flows through the primary windings L1 and L2 of the first and second transformers, due to the working principle of transformers, the voltage across the primary windings L1 and L2 is transferred to the secondary windings L3 and L4. The current flow direction in the secondary windings L3 and L4 is opposite to that in the primary windings L1 and L2. Therefore, the current flow direction in the circuit containing the power battery pack is as follows: sequentially passing through the secondary winding L4 of the second transformer, the first switching module S1, the positive terminal of the power battery pack module, the negative terminal of the power battery pack module, and the fourth switching transistor Q4. Please refer to [link to previous text] for the above current flow direction. Figure 11 The direction indicated by the dashed arrow.

[0090] During the secondary half-cycle operation, the second switch Q2, the fifth switch Q5, and the eighth switch Q8 are simultaneously turned on, while the fourth switch Q4, the sixth switch Q6, and the seventh switch Q7 are simultaneously turned off. At this time, the aforementioned... Figure 10 The actual working circuit of the charging circuit shown is as follows: Figure 12 As shown. Please see below. Figure 12The schematic diagram of the negative half-cycle charging mode circuit shown illustrates the current flow starting from the positive terminal of the power factor corrector, passing sequentially through the fifth switch Q5, inductor L, the primary side of the second transformer L2, the primary side of the first transformer L1, the third switch module S3, the second capacitor C2, and the eighth switch Q8, finally returning to the negative terminal of the power factor corrector. For details on this current flow, please refer to [link to relevant documentation]. Figure 12 The solid arrow indicates the direction of the current flow. When the current flows through the primary windings L1 and L2 of the first and second transformers, due to the working principle of transformers, the voltage across the primary windings L1 and L2 is transferred to the secondary windings L3 and L4 of the first and second transformers. The current flow direction in the secondary windings L3 and L4 is opposite to that in the primary windings L1 and L2. Therefore, the current flow direction in the circuit containing the power battery pack is as follows: sequentially passing through the secondary winding L3 of the first transformer, the first switching module S1, the positive terminal of the power battery pack module, the negative terminal of the power battery pack module, and the second switching transistor Q2. Please refer to [link to relevant documentation] for the above current flow direction. Figure 12 The direction indicated by the dashed arrow.

[0091] By alternating between the positive and negative half-cycles, the voltage output from the AC rectifier module is input to the power battery pack module to charge it.

[0092] The DC voltage output by the AC rectifier module is converted into the DC voltage required by the power battery pack module through the first AC charging circuit or the second AC charging circuit to AC charge the power battery pack module.

[0093] The integrated drive-charging circuit of this application integrates the charging circuit and the drive circuit. In drive mode, the voltage conversion module in the integrated drive-charging circuit is in a first mode, and the integrated drive-charging circuit performs drive operation. In AC charging mode, the voltage conversion module and the second switching module form a first AC charging circuit, or the voltage conversion module and the first switching module form a second AC charging circuit. The integrated drive-charging circuit performs charging operation through the first AC charging circuit or the second AC charging circuit. Using this integrated drive-charging circuit can realize drive operation, DC charging operation, and AC charging operation, thereby reducing the number of circuit components and lowering the overall cost of the vehicle.

[0094] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0095] In the several embodiments provided in this application, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of the units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0096] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. An integrated driving and charging circuit, characterized in that, The system includes a voltage conversion module, a first switch module, and a second switch module. The voltage conversion module is connected to the first switch module, the second switch module, an AC rectifier module, and an electric motor module, respectively. The power battery pack module is connected to the first switch module and the second switch module, respectively. The voltage conversion module includes a transformer module, a first bridge arm module, a second bridge arm module, a third switch module, an inductor, a first capacitor, and a second capacitor. The transformer module, the third switch module, the second capacitor, and the inductor are connected in series to form a first series circuit. The first series circuit is connected to the second bridge arm module. The first bridge arm module is connected to the transformer module and the first capacitor respectively. When in drive mode, the first switch module is closed, the second switch module is open, the third switch module is open, and the voltage conversion module is in the first mode, boosting the voltage output by the power battery pack module to the voltage required by the electric motor module to power the electric motor module, which in turn provides the vehicle driving power. When in AC charging mode, the first switch module is in the off state and the second switch module is in the closed state, the voltage conversion module is in the second mode, and the voltage conversion module and the second switch module constitute a first AC charging circuit. Alternatively, the first switch module is in the closed state and the second switch module is in the off state, the voltage conversion module is in the second mode, and the voltage conversion module and the first switch module constitute a second AC charging circuit. The DC voltage output by the AC rectifier module is converted into the DC voltage required by the power battery pack module through the first AC charging circuit or the second AC charging circuit to charge the power battery pack module. When in DC charging mode and the output voltage of the DC charging port module is greater than or equal to the voltage required by the power battery pack module, the first switch module is controlled to be closed, the second switch module is controlled to be open, and the third switch module is controlled to be open, so as to provide the DC voltage output by the DC charging port module to the power battery pack module for DC charging. When in DC charging mode and the voltage output by the DC charging port module is less than the voltage required by the power battery pack module, the first switch module is controlled to be in the off state, the second switch module is controlled to be in the closed state, and the third switch module is controlled to be in the off state, so as to boost the DC voltage output by the DC charging port module to the voltage required by the power battery pack module, so as to perform boost DC charging on the power battery pack module.

2. The integrated drive charging circuit as described in claim 1, characterized in that, The transformer module includes a first transformer primary side, a second transformer primary side, a first transformer secondary side, and a second transformer secondary side. The first bridge arm module includes a first switch, a second switch, a third switch, and a fourth switch. The second bridge arm module includes a fifth switch, a sixth switch, a seventh switch, and an eighth switch. The primary side of the first transformer, the primary side of the second transformer, the third switch module, the inductor, and the second capacitor are connected in series to form a second series circuit. One end of the second series circuit is connected to one end of the fifth switch and one end of the sixth switch, and the other end of the second series circuit is connected to one end of the seventh switch and one end of the eighth switch, with the other end of the fifth switch connected to the other end of the seventh switch and the other end of the sixth switch connected to the other end of the eighth switch. The positive terminal of the power battery pack module is connected to one end of the first switch module and one end of the second switch module. The other end of the first switch module, one end of the secondary side of the first transformer, and one end of the secondary side of the second transformer are interconnected. The other end of the second switch module is connected to the other end of the first switch tube. The other end of the secondary side of the first transformer is connected to one end of the first switch tube and one end of the second switch tube. The other end of the secondary side of the second transformer is connected to one end of the third switch tube and one end of the fourth switch tube. The other end of the first switch tube is connected to the other end of the third switch tube. The other end of the second switch tube is connected to the other end of the fourth switch tube and the negative terminal of the power battery pack module. One end of the first capacitor is connected to the other end of the third switch tube, and the other end of the first capacitor is connected to the other end of the fourth switch tube.

3. The integrated drive charging circuit as described in claim 2, characterized in that, One end of the DC charging port module, the other end of the first switch module, one end of the secondary side of the first transformer, and one end of the secondary side of the second transformer are interconnected, and the other end of the DC charging port module is connected to the negative terminal of the power battery pack module. When in DC charging mode and the voltage output by the DC charging port module is less than the voltage required by the power battery pack module, the first switch module is in the open state, the second switch module is in the closed state and the third switch module is in the open state. The voltage conversion module is in the third mode. The DC charging circuit composed of the second switch module and the voltage conversion module boosts the DC voltage output by the DC charging port module to the DC voltage required by the power battery pack module, so as to perform boost DC charging on the power battery pack module. When in DC charging mode and the voltage output by the DC charging port module is greater than or equal to the voltage required by the power battery pack module, the first switch module is in a closed state, the second switch module is in a closed state, and the third switch module is in a closed state, so as to provide the DC voltage output by the DC charging port module to the power battery pack module for direct DC charging of the power battery pack module.

4. The integrated drive charging circuit as described in claim 2, characterized in that, The AC rectifier module includes a third capacitor, a charging port, and a power factor corrector. The output terminal of the charging port is connected to the input terminal of the power factor corrector. One end of the third capacitor is connected to one end of the power factor corrector and the other end of the seventh switch. The other end of the third capacitor is connected to the other end of the power factor corrector and the other end of the eighth switch. The power factor corrector is used to convert the AC voltage output from the charging port into a DC voltage.

5. The integrated drive charging circuit as described in claim 2, characterized in that, The electric motor control module includes an electric controller and a motor, with the output terminal of the electric controller connected to the input terminal of the motor; One end of the electronic control unit is connected to one end of the first capacitor, and the other end of the electronic control unit is connected to the other end of the first capacitor. The electronic control unit is used to convert the DC voltage output by the power battery pack module into AC voltage to power the motor.

6. The integrated drive charging circuit as described in claim 2, characterized in that, When the voltage conversion module is in the first mode, the third switch module is in the off state; The secondary side of the first transformer, the first switching transistor, and the second switching transistor constitute a first boost circuit, and the secondary side of the second transformer, the third switching transistor, and the fourth switching transistor constitute a second boost circuit. The voltage output by the power battery pack module is boosted to the voltage required by the electric motor module by the parallel or interleaved operation of the first boost circuit and the second boost circuit.

7. The integrated drive charging circuit as described in claim 2, characterized in that, When the voltage conversion module is in the second mode, the third switch module is in the closed state; The DC voltage output by the AC rectifier module is converted into the DC voltage required by the power battery pack module by the DC voltage converter formed by the voltage conversion module in the first AC charging circuit. Alternatively, the DC voltage output by the AC rectifier module can be converted into the DC voltage required by the power battery pack module by a DC voltage converter formed by the voltage conversion module in the second AC charging circuit.

8. A control method for an integrated drive charging circuit, characterized in that, The integrated drive and charging circuit includes a voltage conversion module, a first switch module, and a second switch module. The voltage conversion module is connected to the first switch module, the second switch module, an AC rectifier module, and an electric motor module, respectively. The power battery pack module is connected to the first switch module and the second switch module, respectively. The voltage conversion module includes a transformer module, a first bridge arm module, a second bridge arm module, a third switch module, an inductor, a first capacitor, and a second capacitor. The transformer module, the third switch module, the second capacitor, and the inductor are connected in series to form a first series circuit. The first series circuit is connected to the second bridge arm module. The first bridge arm module is connected to the transformer module and the first capacitor respectively. The method includes: When in drive mode, the first switch module is controlled to be closed, the second switch module is controlled to be open, the third switch module is controlled to be open, and the voltage conversion module is controlled to be in the first mode to boost the voltage output by the power battery pack module to the voltage required by the electric motor module to supply power to the electric motor module, which provides vehicle driving power. When in AC charging mode, the first switch module is controlled to be in the off state and the second switch module is controlled to be in the closed state, and the voltage conversion module is controlled to be in the second mode. The voltage conversion module and the second switch module constitute a first AC charging circuit. Alternatively, the first switch module is controlled to be in the closed state and the second switch module is controlled to be in the off state, and the voltage conversion module is controlled to be in the second mode. The voltage conversion module and the first switch module constitute a second AC charging circuit. The DC voltage output by the AC rectifier module is converted into the DC voltage required by the power battery pack module through the first AC charging circuit or the second AC charging circuit to charge the power battery pack module. When in DC charging mode and the output voltage of DC charging port module is greater than or equal to the voltage required by the power battery pack module, the first switch module is controlled to be closed, the second switch module is controlled to be open, and the third switch module is controlled to be open. When in DC charging mode and the voltage output by the DC charging port module is less than the voltage required by the power battery pack module, the first switch module is controlled to be in the off state, the second switch module is controlled to be in the closed state, and the third switch module is controlled to be in the off state.

9. An electronic device, characterized in that, Includes an integrated drive charging circuit and controller as described in any one of claims 1 to 7, wherein the controller is used to control the voltage conversion module in a first mode, a second mode, or a third mode, and to control the first switching module and the second switching module.

10. A vehicle, characterized in that, Includes the integrated drive charging circuit as described in any one of claims 1 to 7.

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