Vehicle-mounted charging integrated device and vehicle control system

Abstract

The application relates to a vehicle-mounted charging integrated device and a vehicle-mounted control system. The motor control unit in the device comprises a motor coil and a first switch module connected between the motor coil and a battery; the first output end of the first switch module is connected with the motor coil; a second switch module is used for connecting an external power supply; and a voltage transformation switching module is connected between the motor control circuit and the second switch module. According to the application, the voltage transformation switching module is arranged, the first switch module of the MCU is temporarily occupied by the OBC when the OBC works, and the switching tube on the secondary side of the OBC can be omitted; in addition, the coil inductance of the motor is used as filter inductance, and the inductance on the secondary side of the OBC can be omitted; the power links of the OBC and the MCU are integrated, the whole vehicle electric control system is more compact, power devices and accessories related to the power devices are saved, the overall weight and cost are effectively reduced, the internal structure is simplified, and the overall integration degree of the system is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle control and processing technology, and in particular to an on-board charging integrated device and a vehicle control system. Background Technology

[0002] The integration of electric control systems with electric drive is a major technological direction in the field of new energy vehicles. The advantages brought by integration are very obvious. It can not only reduce the size and weight of the system, improve the convenience of vehicle layout, and increase the interior space, but also further reduce energy loss between systems, significantly improving overall efficiency. Moreover, due to the elimination of housings and connecting parts, the system cost and price will decrease significantly. In addition, the integration of powertrain systems is also conducive to modular standard supply, shortening the development cycle and matching cycle.

[0003] The Motor Control Unit (MCU) is a crucial component of the electric vehicle drive motor control system. The MCU primarily regulates the motor's operating state to meet the various operational requirements of the vehicle. The MCU obtains the vehicle's requirements from the vehicle controller and power from the battery. Through its own inverter modulation, it obtains the necessary power to drive the motor, ensuring that the motor's speed and torque meet the vehicle's requirements. The On-Board Charger (OBC) is a power electronic device for battery charging. Essentially, it's a vehicle-mounted charger, unlike external charging stations. Because it's placed inside the vehicle, the OBC's design significantly impacts the vehicle's weight and space. Furthermore, the evolution of OBCs towards bidirectional energy transfer allows them to both draw power from the grid and feed it back to the grid. This bidirectional capability also benefits the on-board battery, which requires charge-discharge cycles. In most cases, keeping the battery fully charged means all components are constantly charging, which shortens their lifespan and necessitates earlier battery replacement. Under ideal conditions, the OBC can intelligently sense when the car's battery level drops to 30%, and then perform a charge-discharge cycle by feeding the remaining energy back into the home's power grid and recharging the car.

[0004] Traditional integrated systems house the OBC and MCU systems in the same enclosure, using the same heat sink and bus to save on interconnecting cabling. However, as the functional requirements for OBCs become increasingly intelligent and efficient, OBC systems are becoming more complex, with more power devices and occupying more physical space within the vehicle.

[0005] In the process of implementation, the inventors discovered that traditional technologies have at least the following problems: existing on-board charging integrated systems have complex system structures, large volume, high hardware costs, and low overall integration. Summary of the Invention

[0006] Therefore, it is necessary to address the problems existing in the above-mentioned on-board charging integrated systems by providing an on-board charging integrated device and vehicle control system that can integrate the power link of OBC and MCU, making the whole vehicle electronic control system more compact, saving power devices and related accessories, effectively reducing the overall weight and cost, simplifying the internal structure, and improving the overall integration of the system.

[0007] In a first aspect, this application provides an integrated on-board charging device, comprising:

[0008] Battery;

[0009] The motor control circuit includes a motor coil and a first switch module connected between the motor coil and the battery; the first output terminal of the first switch module is connected to the motor coil.

[0010] The second switch module is used to connect to an external power source.

[0011] The transformer switching module is connected between the motor control circuit and the second switching module.

[0012] Optionally, the on-board charging integrated device also includes a controller, which is connected to the first switch module and the second switch module respectively.

[0013] Optionally, the transformer switching module includes a transformer and a selection module;

[0014] The common terminal of the selection module is connected to the second output terminal of the first switch module, and the first selection terminal of the selection module is connected to the motor coil.

[0015] The transformer includes a primary winding and a secondary winding; the second switching module is connected between the external power supply and the primary winding; the first end of the secondary winding is connected to the motor coil, and the second end of the secondary winding is connected to the second selection terminal of the selection module; the control terminal of the selection module is connected to the controller.

[0016] Optionally, the transformer switching module includes a transformer and a third switching module connected to the first switching module;

[0017] The output terminal of the third switch module is connected to the motor coil; the transformer includes a primary winding and a secondary winding; the second switch module is connected between the external power supply and the primary winding; the first and second ends of the secondary winding are respectively connected to the output terminal of the third switch module; the control terminal of the third switch module is connected to the controller.

[0018] Optionally, the third switching module includes a first switching transistor and a second switching transistor;

[0019] The drain of the first switching transistor is connected to the first switching module, the source of the first switching transistor is connected to the drain of the second switching transistor, the motor coil and the first end of the secondary winding, and the gate of the first switching transistor is connected to the controller.

[0020] The source of the second switching transistor is connected to the first switching module, the drain of the second switching transistor is connected to the second end of the secondary winding, and the gate of the second switching transistor is connected to the controller.

[0021] Optionally, the transformer switching module includes a primary winding; the primary winding is disposed on the motor coil; the primary winding is connected to a second switching module.

[0022] Optionally, the first switching module includes a third switching transistor, a fourth switching transistor, a fifth switching transistor, a sixth switching transistor, a seventh switching transistor, and an eighth switching transistor;

[0023] The drain of the third switch is connected to the positive terminal of the battery, the source of the third switch is connected to the drain of the fourth switch, and the source of the fourth switch is connected to the negative terminal of the battery; the drain of the fifth switch is connected to the positive terminal of the battery, the source of the fifth switch is connected to the drain of the sixth switch, and the source of the sixth switch is connected to the negative terminal of the battery; the drain of the seventh switch is connected to the positive terminal of the battery, the source of the seventh switch is connected to the drain of the eighth switch, and the source of the eighth switch is connected to the negative terminal of the battery; the motor coil is connected to the sources of the third switch, the fifth switch, and the seventh switch.

[0024] The controller is connected to the gates of the third, fourth, fifth, sixth, seventh, and eighth switching transistors, respectively.

[0025] Optionally, the second switching module includes a first capacitor, a ninth switching transistor, a tenth switching transistor, an eleventh switching transistor, a twelfth switching transistor, a thirteenth switching transistor, a fourteenth switching transistor, a fifteenth switching transistor, and a sixteenth switching transistor.

[0026] The drain of the ninth switch is connected to the positive terminal of the first capacitor, the source of the ninth switch is connected to the drain of the tenth switch, and the source of the tenth switch is connected to the negative terminal of the first capacitor; the drain of the eleventh switch is connected to the positive terminal of the first capacitor, the source of the eleventh switch is connected to the drain of the twelfth switch, and the source of the twelfth switch is connected to the negative terminal of the first capacitor; the drain of the thirteenth switch is connected to the positive terminal of the first capacitor, the source of the thirteenth switch is connected to the drain of the fourteenth switch, and the source of the fourteenth switch is connected to the negative terminal of the first capacitor.

[0027] The drain of the fifteenth switch is connected to the positive terminal of the first capacitor, the source of the fifteenth switch is connected to the drain of the sixteenth switch, and the source of the sixteenth switch is connected to the negative terminal of the first capacitor; the transformer switching module is connected to the source of the ninth switch and the source of the eleventh switch respectively; the external power supply is connected to the source of the thirteenth switch and the source of the fifteenth switch respectively; the controller is connected to the gate of the ninth switch, the gate of the tenth switch, the gate of the eleventh switch, the gate of the twelfth switch, the gate of the thirteenth switch, the gate of the fourteenth switch, the gate of the fifteenth switch, and the gate of the sixteenth switch respectively.

[0028] Optionally, the second switching module may also include a first inductor and a second inductor;

[0029] The first end of the first inductor is connected to the source of the ninth switching transistor, and the second end of the first inductor is connected to the capacitor switching module.

[0030] The first end of the second inductor is connected to the source of the fifteenth switching transistor, and the second end of the second inductor is connected to an external power supply.

[0031] Secondly, this application provides a vehicle control system including any of the above-mentioned on-board charging integrated devices.

[0032] One of the above technical solutions has the following advantages and beneficial effects:

[0033] The aforementioned on-board charging integrated device includes a battery, a motor control circuit, a second switching module, and a transformer switching module. The motor control unit includes a motor coil and a first switching module connected between the motor coil and the battery. The first output terminal of the first switching module is connected to the motor coil. The second switching module is used to connect to an external power supply. The transformer switching module is connected between the motor control circuit and the second switching module. Based on the principle that the OBC and MCU do not work simultaneously, this application sets up a transformer switching module so that when the OBC is working, the OBC temporarily occupies the first switching module of the MCU, thereby eliminating the need for a switching transistor on the secondary side of the OBC. Furthermore, the inductance of the motor coil is used as a filter inductor for rectification, thus eliminating the need for an inductor on the secondary side of the OBC. By integrating the power links of the OBC and MCU, the entire vehicle electronic control system becomes more compact, saving power devices and related accessories, effectively reducing overall weight and cost, simplifying the internal structure, and improving the overall system integration. Attached Figure Description

[0034] Figure 1 A schematic diagram of the circuit structure of a traditional integrated vehicle OBC and MCU device;

[0035] Figure 2 This is a schematic diagram of the first structure of the on-board charging integrated device in the embodiments of this application;

[0036] Figure 3 This is a schematic diagram of the second structure of the on-board charging integrated device in the embodiments of this application;

[0037] Figure 4 This is a schematic diagram of the third structure of the on-board charging integrated device in the embodiments of this application;

[0038] Figure 5 This is a schematic diagram of the first circuit of the on-board charging integrated device in the embodiments of this application;

[0039] Figure 6 This is a schematic diagram of the fourth structure of the on-board charging integrated device in the embodiments of this application;

[0040] Figure 7 This is a schematic diagram of the second circuit of the on-board charging integrated device in the embodiments of this application;

[0041] Figure 8 This is a schematic diagram of the fifth structure of the on-board charging integrated device in the embodiments of this application;

[0042] Figure 9 This is a schematic diagram of the third circuit of the on-board charging integrated device in the embodiments of this application.

[0043] Figure label:

[0044] 10. Battery; 20. Motor control circuit; 210. Motor coil; 220. First switch module; 30. Second switch module; 40. Transformer switching module; 410. Transformer; 420. Selection module; 430. Third switch module; 50. External power supply; 60. Controller;

[0045] Q1, First switch transistor; Q2, Second switch transistor; Q3, Third switch transistor; Q4, Fourth switch transistor; Q5, Fifth switch transistor; Q6, Sixth switch transistor; Q7, Seventh switch transistor; Q8, Eighth switch transistor; Q9, Ninth switch transistor; Q10, Tenth switch transistor; Q11, Eleventh switch transistor; Q12, Twelfth switch transistor; Q13, Thirteenth switch transistor; Q14, Fourteenth switch transistor; Q15, Fifteenth switch transistor; Q16, Sixteenth switch transistor; C1, First capacitor; L1, First inductor; L1, Second inductor; L3, Primary winding. Detailed Implementation

[0046] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0047] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. 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 comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0048] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0049] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0050] In addition, the term "multiple" should mean two or more.

[0051] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0052] The power circuit of a traditional vehicle OBC and MCU integrated device, such as Figure 1As shown, a traditional power circuit includes a battery pack, a motor control unit (MCU), and an on-board charger (OBC). The MCU includes three-phase bridge switching transistors (Q100-Q106) and three-phase motor coils (L10-L30). The OBC includes a power circuit (PFC) consisting of switching transistors Q107-Q118, inductors L40, L50 and L60, transformer T10, and capacitor C10.

[0053] Traditional automotive OBC and MCU integrated devices place the OBC and MCU modules in the same enclosure, using the same heat sink and bus to save on interconnecting wiring. However, as the functional requirements of OBCs become increasingly intelligent and efficient, OBC systems are becoming more complex, with more power devices and occupying more physical space within the vehicle. For example, the switches Q115-Q118, which form the primary-side PFC, act as inverter bridge switches during battery discharge, making them essential. Similarly, the switches Q107-Q110, which function as active synchronous rectification during charging and inverter bridge during battery discharge, are also essential. Traditional automotive OBC and MCU integrated devices typically include 12 switches, 1 transformer, 1 bus capacitor bank, and 3 inductors within the entire OBC, resulting in a large OBC size, complex system structure, high hardware cost, and low overall integration.

[0054] To address the problems existing in the current integrated vehicle OBC and MCU devices, in one embodiment, such as... Figure 2 As shown, an integrated on-board charging device is provided, including a battery 10, a motor control circuit 20, a second switching module 30, and a transformer switching module 40. The motor control unit includes a motor coil 210 and a first switching module 220 connected between the motor coil 210 and the battery 10; a first output terminal of the first switching module 220 is connected to the motor coil 210; the second switching module 30 is used to connect to an external power supply 50; and the transformer switching module 40 is connected between the motor control circuit 20 and the second switching module 30.

[0055] The battery 10 may be, but is not limited to, a lithium battery 10. The battery 10 may include several cells, which are combined in series and / or parallel to form the battery 10. The motor control circuit 20 includes an MCU (motor controller 60), which can be used to adjust the operating state of the vehicle motor to meet different operating requirements of the vehicle. The MCU obtains the vehicle's requirements from the vehicle controller 60, obtains electrical energy from the power battery 10, and modulates it through its own inverter to obtain the electrical energy required to drive the motor, thereby ensuring that the motor's speed and torque meet the vehicle's requirements. The motor control unit may include a motor coil 210 and a first switching module 220. The motor coil 210 refers to the winding coil of the vehicle motor. The first switching module 220 may refer to the power switching module of the MCU. The second switching module 30 refers to the primary-side switching module of the on-board charger (OBC). The transformer switching module 40 can be used to switch the circuit function when the vehicle's state switches to on-board charging and discharging state. By occupying the first switch module 220 and the motor coil 210 of the motor control circuit 20, the first switch module 220, the motor coil 210, the second switch module 30, and the transformer switching module 40 form an OBC, thereby realizing on-board charging and discharging. When the vehicle's state switches to the motor operating state, the first switch module 220 and the motor coil 210 form an MCU, and the second switch module 30 does not work, realizing the control of the motor.

[0056] In the above embodiments, the first output terminal of the first switch module 220 is connected to the motor coil 210; the second switch module 30 is used to connect to the external power supply 50; and the transformer switching module 40 is connected between the motor control circuit 20 and the second switch module 30. Based on the principle that the OBC and MCU do not operate simultaneously, this application sets up the transformer switching module 40 so that when the OBC is working, it temporarily occupies the first switch module 220 of the MCU, thus eliminating the need for a switching transistor on the secondary side of the OBC. Furthermore, the inductance of the motor coil is used as a filter inductor for rectification, thereby eliminating the need for an inductor on the secondary side of the OBC. By integrating the power links of the OBC and MCU, the vehicle's electronic control system becomes more compact, saving power devices and related accessories, effectively reducing overall weight and cost, simplifying the internal structure, and improving the overall system integration.

[0057] In one embodiment, such as Figure 3 As shown, the on-board charging integrated device also includes a controller 60, which is connected to the first switch module 220 and the second switch module 30 respectively.

[0058] The controller 60 can be a DSP (Digital Signal Processing) controller 60. Based on the controller 60 connected to the first switch module 220 and the second switch module 30 respectively, when the vehicle switches to on-board charging / discharging mode, the controller 60 controls the first switch module 220 and the second switch module 30 to operate, thereby enabling on-board charging / discharging. When the vehicle switches to motor operating mode, the controller 60 controls the first switch module 220 to operate, while the second switch module 30 is inactive, thereby enabling motor control. By sharing a single controller 60 for both motor control and on-board charging / discharging control, the internal structure is further simplified, and the overall system integration is improved.

[0059] In one embodiment, such as Figure 4 As shown, the transformer switching module 40 includes a transformer 410 and a selection module 420; the common terminal of the selection module 420 is connected to the second output terminal of the first switch module 220, and the first selection terminal of the selection module 420 is connected to the motor coil 210; the transformer 410 includes a primary winding and a secondary winding; the second switch module 30 is connected between the external power supply 50 and the primary winding; the first end of the secondary winding is connected to the motor coil 210, and the second end of the secondary winding is connected to the second selection terminal of the selection module 420; the control terminal of the selection module 420 is connected to the controller 60.

[0060] Transformer 410 is an isolation transformer. Selection module 420 can be a selection switch, such as a single-pole double-throw selection switch. Motor coil 210 is a three-phase motor coil, such as a first-phase coil, a second-phase coil, and a third-phase coil. The first-phase motor coil 210 and the second-phase motor coil 210 are respectively connected to the first switch module 220. The third-phase motor coil 210 is connected to the first selection terminal of selection module 420. The center point of motor coil 210 is connected to the first end of the secondary winding.

[0061] The center point of the motor coil 210 is connected to the first end of the secondary winding of the transformer 410. The second end of the secondary winding of the transformer 410 is connected to the second selection terminal of the selection module 420. The common terminal of the selection module 420 is connected to the output terminal of the first switch module 220, and the first end of the secondary winding is connected to the motor coil 210. When the MCU needs to work, the first selection terminal of the control selection module 420 is turned on, and the second selection terminal is turned off, thus the MCU works, and the vehicle is in a drivable state. At this time, the on-board charging and discharging control does not work. When on-board charging and discharging control is needed, the first selection terminal of the selection module 420 is turned off, and the second selection terminal is turned on, thus the on-board charging and discharging works, connecting the battery 10. The vehicle is in a charging or discharging state for the battery 10. At this time, the MCU does not work, and the vehicle cannot be driven.

[0062] For example, such as Figure 5 As shown, the first switch module 220 includes 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. The drain of the third switch Q3 is connected to the positive terminal of the battery 10, the source of the third switch Q3 is connected to the drain of the fourth switch Q4, and the source of the fourth switch Q4 is connected to the negative terminal of the battery 10. The drain of the fifth switch Q5 is connected to the positive terminal of the battery 10, the source of the fifth switch Q5 is connected to the drain of the sixth switch Q6, and the source of the sixth switch Q6 is connected to the negative terminal of the battery 10. The drain of the seventh switch Q7 is connected to the positive terminal of the battery 10, the source of the seventh switch Q7 is connected to the drain of the eighth switch Q8, and the source of the eighth switch Q8 is connected to the negative terminal of the battery 10; the motor coil 210 is connected to the source of the third switch Q3, the source of the fifth switch Q5, and the source of the seventh switch Q7; the controller 60 is connected to the gate of the third switch Q3, the gate of the fourth switch Q4, the gate of the fifth switch Q5, the gate of the sixth switch Q6, the gate of the seventh switch Q7, and the gate of the eighth switch Q8.

[0063] like Figure 5As shown, the second switching module 30 includes a first capacitor C1, a ninth switch Q9, a tenth switch Q10, an eleventh switch Q11, a twelfth switch Q12, a thirteenth switch Q13, a fourteenth switch Q14, a fifteenth switch Q15, and a sixteenth switch Q16. The drain of the ninth switch Q9 is connected to the positive terminal of the first capacitor C1, the source of the ninth switch Q9 is connected to the drain of the tenth switch Q10, and the source of the tenth switch Q10 is connected to the negative terminal of the first capacitor C1. The drain of the eleventh switch Q11 is connected to the positive terminal of the first capacitor C1, the source of the eleventh switch Q11 is connected to the drain of the twelfth switch Q12, and the source of the twelfth switch Q12 is connected to the negative terminal of the first capacitor C1. The drain of the thirteenth switch Q13 is connected to the positive terminal of the first capacitor C1, and the source of the thirteenth switch Q13 is connected to the fourteenth switch Q16. The drain of the fourteenth switch Q14 is connected to the source of the first capacitor C1; the drain of the fifteenth switch Q15 is connected to the positive terminal of the first capacitor C1, the source of the fifteenth switch Q15 is connected to the drain of the sixteenth switch Q16, and the source of the sixteenth switch Q16 is connected to the negative terminal of the first capacitor C1; the transformer switching module 40 is connected to the source of the ninth switch Q9 and the source of the eleventh switch Q11 respectively; the external power supply 50 is connected to the source of the thirteenth switch Q13 and the source of the fifteenth switch Q15 respectively; the controller 60 is connected to the gate of the ninth switch Q9, the gate of the tenth switch Q10, the gate of the eleventh switch Q11, the gate of the twelfth switch Q12, the gate of the thirteenth switch Q13, the gate of the fourteenth switch Q14, the gate of the fifteenth switch Q15, and the gate of the sixteenth switch Q16 respectively.

[0064] Among them, the third switch Q3, the fourth switch Q4, the fifth switch Q5, the sixth switch Q6, the seventh switch Q7, the eighth switch Q8, the ninth switch Q9, the tenth switch Q10, the eleventh switch Q11, the twelfth switch Q12, the thirteenth switch Q13, the fourteenth switch Q14, the fifteenth switch Q15, and the sixteenth switch Q16 can all be N-type MOSFETs. MOSFET refers to Metal-Oxide-Semiconductor Field-Effect Transistor.

[0065] In the above embodiments, since the MCU is not working when the OBC is operating (i.e., the vehicle's motor is not working during charging), the circuit function can be switched by setting the selection module 420. The first switch module 220 replaces the function of the secondary-side switch transistor of the OBC, and the motor coil 210 replaces the function of the secondary-side inductor. This saves on the secondary-side switch transistor and the secondary-side inductor. This can be achieved simply by adjusting the system control logic. Furthermore, the MCU controller 60 can also be used as the OBC controller 60, saving on the OBC controller 60 and thus reducing power devices.

[0066] When the vehicle switches to on-board charging / discharging mode, the controller 60 controls the second selection terminal of the selection module 420 to conduct, and controls the first switch module 220 and the second switch module 30 to operate, thereby enabling on-board charging / discharging. When the vehicle switches to motor operating mode, the controller 60 controls the first selection terminal of the selection module 420 to conduct, and controls the first switch module 220 to operate, while the second switch module 30 is deactivated, thereby enabling motor control. By sharing a single controller 60 for motor control and on-board charging / discharging control, the internal structure is further simplified, and the overall system integration is improved. By integrating the power links of the OBC and MCU, the entire vehicle electronic control system becomes more compact, saving power devices and related accessories, effectively reducing overall weight and cost, simplifying the internal structure, and improving the overall system integration.

[0067] In one embodiment, such as Figure 6 As shown, the transformer switching module 40 includes a transformer 410 and a third switching module 430 connected to the first switching module 220; the output terminal of the third switching module 430 is connected to the motor coil 210; the transformer 410 includes a primary winding and a secondary winding; the second switching module 30 is connected between the external power supply 50 and the primary winding; the first and second ends of the secondary winding are respectively connected to the output terminal of the third switching module 430; the control terminal of the third switching module 430 is connected to the controller 60.

[0068] Transformer 410 is an isolation transformer. Selection module 420 can be a selection switch, such as a single-pole double-throw selection switch. Motor coil 210 is a three-phase motor coil, such as a first-phase coil, a second-phase coil, and a third-phase coil. The first-phase motor coil 210 and the second-phase motor coil 210 are respectively connected to the first switch module 220. The third-phase motor coil 210 is connected to the first selection terminal of selection module 420. The center point of motor coil 210 is connected to the first end of the secondary winding.

[0069] For example, such as Figure 7As shown, the third switching module 430 includes a first switching transistor Q1 and a second switching transistor Q2; the drain of the first switching transistor Q1 is connected to the first switching module 220, the source of the first switching transistor Q1 is connected to the drain of the second switching transistor Q2, the motor coil 210 and the first end of the secondary winding, and the gate of the first switching transistor Q1 is connected to the controller 60; the source of the second switching transistor Q2 is connected to the first switching module 220, the drain of the second switching transistor Q2 is connected to the second end of the secondary winding, and the gate of the second switching transistor Q2 is connected to the controller 60.

[0070] The second switch module 30 is connected between the external power supply 50 and the primary winding; the first and second ends of the secondary winding are respectively connected to the output terminals of the third switch module 430; the control terminal of the third switch module 430 is connected to the controller 60. When the MCU needs to work, the controller 60 controls the first switch module 220 to work, while the third switch module 430 and the second switch module 30 are not working, thus enabling the MCU to work and the vehicle to be drivable. At this time, the on-board charging and discharging control is not working. When on-board charging and discharging control is needed, the controller 60 controls the first switch module 220, the second switch module 30, and the third switch module 430 to work, thus enabling on-board charging and discharging, connecting the battery 10, and the vehicle to charge or discharge the battery 10. At this time, the MCU is not working, and the vehicle cannot be driven.

[0071] For example, such as Figure 7 As shown, the first switch module 220 includes 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. The drain of the third switch Q3 is connected to the positive terminal of the battery 10, the source of the third switch Q3 is connected to the drain of the fourth switch Q4, and the source of the fourth switch Q4 is connected to the negative terminal of the battery 10. The drain of the fifth switch Q5 is connected to the positive terminal of the battery 10, the source of the fifth switch Q5 is connected to the drain of the sixth switch Q6, and the source of the sixth switch Q6 is connected to the negative terminal of the battery 10. The drain of the seventh switch Q7 is connected to the positive terminal of the battery 10, the source of the seventh switch Q7 is connected to the drain of the eighth switch Q8, and the source of the eighth switch Q8 is connected to the negative terminal of the battery 10; the motor coil 210 is connected to the source of the third switch Q3, the source of the fifth switch Q5, and the source of the seventh switch Q7; the controller 60 is connected to the gate of the third switch Q3, the gate of the fourth switch Q4, the gate of the fifth switch Q5, the gate of the sixth switch Q6, the gate of the seventh switch Q7, and the gate of the eighth switch Q8.

[0072] like Figure 7As shown, the second switching module 30 includes a first capacitor C1, a ninth switch Q9, a tenth switch Q10, an eleventh switch Q11, a twelfth switch Q12, a thirteenth switch Q13, a fourteenth switch Q14, a fifteenth switch Q15, and a sixteenth switch Q16. The drain of the ninth switch Q9 is connected to the positive terminal of the first capacitor C1, the source of the ninth switch Q9 is connected to the drain of the tenth switch Q10, and the source of the tenth switch Q10 is connected to the negative terminal of the first capacitor C1. The drain of the eleventh switch Q11 is connected to the positive terminal of the first capacitor C1, the source of the eleventh switch Q11 is connected to the drain of the twelfth switch Q12, and the source of the twelfth switch Q12 is connected to the negative terminal of the first capacitor C1. The drain of the thirteenth switch Q13 is connected to the positive terminal of the first capacitor C1, and the source of the thirteenth switch Q13 is connected to the fourteenth switch Q16. The drain of the fourteenth switch Q14 is connected to the source of the first capacitor C1; the drain of the fifteenth switch Q15 is connected to the positive terminal of the first capacitor C1, the source of the fifteenth switch Q15 is connected to the drain of the sixteenth switch Q16, and the source of the sixteenth switch Q16 is connected to the negative terminal of the first capacitor C1; the transformer switching module 40 is connected to the source of the ninth switch Q9 and the source of the eleventh switch Q11 respectively; the external power supply 50 is connected to the source of the thirteenth switch Q13 and the source of the fifteenth switch Q15 respectively; the controller 60 is connected to the gate of the ninth switch Q9, the gate of the tenth switch Q10, the gate of the eleventh switch Q11, the gate of the twelfth switch Q12, the gate of the thirteenth switch Q13, the gate of the fourteenth switch Q14, the gate of the fifteenth switch Q15, and the gate of the sixteenth switch Q16 respectively.

[0073] Among them, 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, the eighth switch Q8, the ninth switch Q9, the tenth switch Q10, the eleventh switch Q11, the twelfth switch Q12, the thirteenth switch Q13, the fourteenth switch Q14, the fifteenth switch Q15, and the sixteenth switch Q16 can all be N-type MOSFETs.

[0074] In the above embodiments, since the MCU is not working when the OBC is operating (i.e., the vehicle's motor is not working during charging), by retaining one half-bridge of the OBC's active synchronous rectification, it is not necessary to disconnect one phase of the motor coil. The center point of the motor coil 210 is connected to the output of the third switching module 430, enabling circuit function switching. By using the first switching module 220 to replace the function of the secondary-side switching transistor of the OBC, and the motor coil 210 to replace the function of the secondary-side inductor, the secondary-side switching transistor and secondary-side inductor are saved. Motor control and on-board charging / discharging control can be achieved simply by adjusting the system control logic. Furthermore, the MCU's controller 60 can also be used as the OBC's controller 60, saving the OBC controller 60 and thus reducing power devices.

[0075] When the vehicle switches to on-board charging / discharging mode, the controller 60 controls the third switch module 430 to operate, and also controls the first switch module 220 and the second switch module 30 to operate, thereby enabling on-board charging / discharging. When the vehicle switches to motor operating mode, the controller 60 controls the third switch module 430 to be inactive, and controls the first switch module 220 to operate, while the second switch module 30 is inactive, thereby enabling motor control. By sharing a single controller 60 for motor control and on-board charging / discharging control, the internal structure is further simplified, and the overall system integration is improved. By integrating the power links of the OBC and MCU, the entire vehicle electronic control system becomes more compact, saving power devices and related accessories, effectively reducing overall weight and cost, simplifying the internal structure, and improving the overall system integration.

[0076] In one embodiment, such as Figure 8 As shown, the transformer switching module 40 includes a primary winding L3; the primary winding L3 is disposed on the motor coil 210; the primary winding L3 is connected to the second switching module 30.

[0077] The motor coil 210 includes a first-phase motor coil 210, a second-phase motor coil 210, and a third-phase motor coil 210. By setting a primary winding L3 on the first motor coil 210, the first-phase motor coil 210 and the primary winding L3 form a transformer 410, eliminating the need for a separate transformer 410 and further saving the need for a separate transformer 410. By using a first switching module 220 to replace the function of the secondary-side switching transistor of the OBC, and using the second-phase motor coil 210 and the third-phase motor coil 210 to replace the function of the secondary-side inductor, motor control and on-board charging and discharging control can be achieved simply by adjusting the system control logic. In addition, the MCU controller 60 can also be used as the OBC controller 60, saving the OBC controller 60 and thus reducing power devices.

[0078] For example, such as Figure 9 As shown, the first switch module 220 includes 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. The drain of the third switch Q3 is connected to the positive terminal of the battery 10, the source of the third switch Q3 is connected to the drain of the fourth switch Q4, and the source of the fourth switch Q4 is connected to the negative terminal of the battery 10. The drain of the fifth switch Q5 is connected to the positive terminal of the battery 10, the source of the fifth switch Q5 is connected to the drain of the sixth switch Q6, and the source of the sixth switch Q6 is connected to the negative terminal of the battery 10. The drain of the seventh switch Q7 is connected to the positive terminal of the battery 10, the source of the seventh switch Q7 is connected to the drain of the eighth switch Q8, and the source of the eighth switch Q8 is connected to the negative terminal of the battery 10; the motor coil 210 is connected to the source of the third switch Q3, the source of the fifth switch Q5, and the source of the seventh switch Q7; the controller 60 is connected to the gate of the third switch Q3, the gate of the fourth switch Q4, the gate of the fifth switch Q5, the gate of the sixth switch Q6, the gate of the seventh switch Q7, and the gate of the eighth switch Q8.

[0079] like Figure 9As shown, the second switching module 30 includes a first capacitor C1, a ninth switch Q9, a tenth switch Q10, an eleventh switch Q11, a twelfth switch Q12, a thirteenth switch Q13, a fourteenth switch Q14, a fifteenth switch Q15, and a sixteenth switch Q16. The drain of the ninth switch Q9 is connected to the positive terminal of the first capacitor C1, the source of the ninth switch Q9 is connected to the drain of the tenth switch Q10, and the source of the tenth switch Q10 is connected to the negative terminal of the first capacitor C1. The drain of the eleventh switch Q11 is connected to the positive terminal of the first capacitor C1, the source of the eleventh switch Q11 is connected to the drain of the twelfth switch Q12, and the source of the twelfth switch Q12 is connected to the negative terminal of the first capacitor C1. The drain of the thirteenth switch Q13 is connected to the positive terminal of the first capacitor C1, and the source of the thirteenth switch Q13 is connected to the fourteenth switch Q16. The drain of the fourteenth switch Q14 is connected to the source of the first capacitor C1; the drain of the fifteenth switch Q15 is connected to the positive terminal of the first capacitor C1, the source of the fifteenth switch Q15 is connected to the drain of the sixteenth switch Q16, and the source of the sixteenth switch Q16 is connected to the negative terminal of the first capacitor C1; the transformer switching module 40 is connected to the source of the ninth switch Q9 and the source of the eleventh switch Q11 respectively; the external power supply 50 is connected to the source of the thirteenth switch Q13 and the source of the fifteenth switch Q15 respectively; the controller 60 is connected to the gate of the ninth switch Q9, the gate of the tenth switch Q10, the gate of the eleventh switch Q11, the gate of the twelfth switch Q12, the gate of the thirteenth switch Q13, the gate of the fourteenth switch Q14, the gate of the fifteenth switch Q15, and the gate of the sixteenth switch Q16 respectively.

[0080] In the above embodiments, when the vehicle switches to on-board charging / discharging mode, the controller 60 controls the first switch module 220 and the second switch module 30 to operate. At this time, the first phase motor coil 210 and the primary winding L3 are used as transformer 410, and the second phase motor coil 210 and the third phase motor coil 210 are used as secondary inductors of the OBC, thereby enabling on-board charging / discharging. When the vehicle switches to motor operating mode, the controller 60 controls the first switch module 220 to operate, while the second switch module 30 is not operating, thereby enabling motor control. By sharing a single controller 60 for motor control and on-board charging / discharging control, the internal structure is further simplified, and the overall system integration is improved. By integrating the power link between the OBC and the MCU, the entire vehicle electronic control system becomes more compact, saving power devices and related accessories, effectively reducing overall weight and cost, simplifying the internal structure, and improving the overall system integration.

[0081] In one embodiment, such as Figure 5 , Figure 7 and Figure 9As shown, the second switching module 30 also includes a first inductor L1 and a second inductor L2; the first end of the first inductor L1 is connected to the source of the ninth switching transistor Q9, and the second end of the first inductor L1 is connected to the capacitor switching module; the first end of the second inductor L2 is connected to the source of the fifteenth switching transistor Q15, and the second end of the second inductor L2 is connected to the external power supply 50.

[0082] Among them, the first inductor L1 is the primary side filter inductor of the transformer 410, and the second inductor L2 can be used to filter the electrical signals input to or output to the external power supply 50.

[0083] In one embodiment, a vehicle control system is also provided, including any of the above-mentioned on-board charging integrated devices.

[0084] The vehicle can be an electric vehicle. For a detailed description of the on-board charging integrated device described above, please refer to the description of the above embodiments; it will not be repeated here.

[0085] For example, the vehicle control system may also include a VCU (Vehicle Control Unit), a BMS (Battery Management System), a DC / DC converter, a PDU (Power Distribution Unit), and a BDU (Battery Disconnect Unit).

[0086] The motor control unit includes a motor coil and a first switching module connected between the motor coil and the battery. The first output terminal of the first switching module is connected to the motor coil. A second switching module is used to connect to an external power supply. A transformer switching module is connected between the motor control circuit and the second switching module. Based on the principle that the OBC and MCU do not operate simultaneously, this application sets up a transformer switching module so that when the OBC is working, it temporarily occupies the first switching module of the MCU, thus eliminating the need for a switching transistor on the secondary side of the OBC. Furthermore, the inductance of the motor coil is used as a filter inductor for rectification, further eliminating the need for an inductor on the secondary side of the OBC. By integrating the power links of the OBC and MCU, the vehicle's electronic control system becomes more compact, saving power devices and related accessories, effectively reducing overall weight and cost, simplifying the internal structure, and improving the overall system integration.

[0087] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An on-board charging integrated device, characterized by, The application relates to a battery charging and discharging circuit, which comprises the following parts: a battery; a motor control circuit, which comprises a motor coil and a first switch module connected between the motor coil and the battery; a first output end of the first switch module is connected with the motor coil; a second switch module for connecting an external power supply; a voltage transformation switching module connected between the motor control circuit and the second switch module; when the state of a vehicle is switched to a battery charging and discharging state, the first switch module, the motor coil, the second switch module and the voltage transformation switching module form a battery charging and discharging circuit; when the state of the vehicle is switched to a motor working state, the first switch module and the motor coil form the motor control circuit.

2. The on-board charging integrated device according to claim 1, characterized in that, The application further comprises a controller connected with the first switch module and the second switch module respectively.

3. The integrated on-board charging device of claim 2, wherein, The voltage transformation switching module comprises a transformer and a selection module; a common end of the selection module is connected with a second output end of the first switch module, and a first selection end of the selection module is connected with the motor coil; the transformer comprises a primary winding and a secondary winding; the second switch module is connected between an external power supply and the primary winding; a first end of the secondary winding is connected with the motor coil, and a second end of the secondary winding is connected with a second selection end of the selection module; and a control end of the selection module is connected with the controller.

4. The integrated on-board charging device of claim 2, wherein, The voltage transformation switching module comprises a transformer and a third switch module connected with the first switch module; an output end of the third switch module is connected with the motor coil; the transformer comprises a primary winding and a secondary winding; the second switch module is connected between an external power supply and the primary winding; a first end and a second end of the secondary winding are respectively connected with the output end of the third switch module; and a control end of the third switch module is connected with the controller.

5. The integrated on-board charging device of claim 4, wherein, The third switch module comprises a first switch tube and a second switch tube; a drain of the first switch tube is connected with the first switch module, a source of the first switch tube is respectively connected with a drain of the second switch tube, the motor coil and a first end of the secondary winding, and a gate of the first switch tube is connected with the controller; a source of the second switch tube is connected with the first switch module, a drain of the second switch tube is connected with a second end of the secondary winding, and a gate of the second switch tube is connected with the controller.

6. The integrated on-board charging device of claim 2, wherein, The voltage transformation switching module comprises a primary winding; the primary winding is arranged on the motor coil; and the primary winding is connected with the second switch module.

7. The on-board charging integrated device according to any one of claims 2 to 5, characterized in that, The first switch module comprises a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a seventh switch tube and an eighth switch tube; The drain electrode of the third switch tube is connected to the positive electrode of the battery, the source electrode of the third switch tube is connected to the drain electrode of the fourth switch tube, and the source electrode of the fourth switch tube is connected to the negative electrode of the battery; the drain electrode of the fifth switch tube is connected to the positive electrode of the battery, the source electrode of the fifth switch tube is connected to the drain electrode of the sixth switch tube, and the source electrode of the sixth switch tube is connected to the negative electrode of the battery; the drain electrode of the seventh switch tube is connected to the positive electrode of the battery, the source electrode of the seventh switch tube is connected to the drain electrode of the eighth switch tube, and the source electrode of the eighth switch tube is connected to the negative electrode of the battery; and the motor coil is connected to the source electrode of the third switch tube, the source electrode of the fifth switch tube, and the source electrode of the seventh switch tube. The controller is connected to the gate electrode of the third switch tube, the gate electrode of the fourth switch tube, the gate electrode of the fifth switch tube, the gate electrode of the sixth switch tube, the gate electrode of the seventh switch tube, and the gate electrode of the eighth switch tube.

8. The integrated on-board charging device of claim 7, wherein, The second switch module comprises a first capacitor, a ninth switch tube, a tenth switch tube, an eleventh switch tube, a twelfth switch tube, a thirteenth switch tube, a fourteenth switch tube, a fifteenth switch tube, and a sixteenth switch tube. The drain electrode of the ninth switch tube is connected to the positive electrode of the first capacitor, the source electrode of the ninth switch tube is connected to the drain electrode of the tenth switch tube, and the source electrode of the tenth switch tube is connected to the negative electrode of the first capacitor; the drain electrode of the eleventh switch tube is connected to the positive electrode of the first capacitor, the source electrode of the eleventh switch tube is connected to the drain electrode of the twelfth switch tube, and the source electrode of the twelfth switch tube is connected to the negative electrode of the first capacitor; the drain electrode of the thirteenth switch tube is connected to the positive electrode of the first capacitor, the source electrode of the thirteenth switch tube is connected to the drain electrode of the fourteenth switch tube, and the source electrode of the fourteenth switch tube is connected to the negative electrode of the first capacitor. The drain electrode of the fifteenth switch tube is connected to the positive electrode of the first capacitor, the source electrode of the fifteenth switch tube is connected to the drain electrode of the sixteenth switch tube, and the source electrode of the sixteenth switch tube is connected to the negative electrode of the first capacitor; the voltage conversion switch module is connected to the source electrode of the ninth switch tube and the source electrode of the eleventh switch tube; and the external power supply is connected to the source electrode of the thirteenth switch tube and the source electrode of the fifteenth switch tube. The controller is connected to the gate electrode of the ninth switch tube, the gate electrode of the tenth switch tube, the gate electrode of the eleventh switch tube, the gate electrode of the twelfth switch tube, the gate electrode of the thirteenth switch tube, the gate electrode of the fourteenth switch tube, the gate electrode of the fifteenth switch tube, and the gate electrode of the sixteenth switch tube.

9. The integrated on-board charging device of claim 8, wherein, The second switch module further comprises a first inductor and a second inductor. The first end of the first inductor is connected to the source electrode of the ninth switch tube, and the second end of the first inductor is connected to the capacitor switch module. The first end of the second inductor is connected to the source electrode of the fifteenth switch tube, and the second end of the second inductor is connected to the external power supply.

10. A vehicle control system characterized by comprising: The vehicle-mounted charging integrated device comprises any one of the vehicle-mounted charging integrated devices in claims 1 to 9.

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