On-board charger, vehicle, and vehicle charging method

Abstract

The present application discloses an on-board charger, a vehicle and a charging method for the vehicle, and relates to the field of new energy vehicle technology. The on-board charger includes: a resonant circuit, the resonant circuit includes a three-phase winding of a generator and a relay unit connected to the three-phase winding; when the relay unit is in a disconnected state, the on-board charger operates in an extended-range power generation state, and the resonant circuit is used to provide a control voltage to the three-phase winding of the generator to control the rotation of the generator and the extended-range engine mechanically linked to the generator, and rectify the AC power generated by the rotation of the extended-range engine and the generator and output it to the battery pack of the vehicle. The present application realizes the reuse of the on-board charger as a generator controller, controls the rotation of the generator and the extended-range engine mechanically linked to the generator to generate electricity, improves component utilization, and reduces vehicle cost, weight, power consumption and occupied space.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicle technology, and in particular to an on-board charger, a vehicle, and a charging method for the vehicle. Background Art

[0002] Power batteries are the power source for new energy electric vehicles. Since the storage capacity of power batteries is limited, how to improve the cruising range of new energy electric vehicles has become a technical problem that needs to be urgently solved in the industry.

[0003] In order to improve the range of new energy electric vehicles, the relevant technology uses range extenders / hybrids to increase fuel range. However, this technology has at least the following defects: First, due to the large weight of the range extender / hybrid, the vehicle power consumption is increased in most short-distance vehicle use scenarios (compared to vehicles without range extenders / hybrids); second, the range extender / hybrid is expensive, which increases the vehicle cost but has a low utilization rate; third, the range extender / hybrid requires a large space, which compresses the storage space available to users. Summary of the invention

[0004] In response to the above technical problems, the embodiments of the present application provide an on-board charger, a vehicle and a charging method for the vehicle, which can realize the reuse of the on-board charger as a generator controller, control the generator and the range-extending engine mechanically linked to the generator to rotate to generate electrical energy, thereby improving component utilization and reducing vehicle cost, weight, power consumption and occupied space.

[0005] The technical solution of this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a vehicle charger, comprising: a resonant circuit, wherein the resonant circuit comprises a three-phase winding of a generator and a relay unit connected to the three-phase winding;

[0007] When the relay unit is in the disconnected state, the on-board charger operates in the extended-range power generation state, and the resonant circuit is used to provide a control voltage to the three-phase winding of the generator to control the rotation of the generator and the extended-range engine mechanically linked to the generator, and to rectify and output the AC power generated by the rotation of the extended-range engine and the generator to the battery pack of the vehicle.

[0008] In some embodiments, when the relay unit is in a closed state, the on-board charger operates in an AC charging state, and the resonant circuit is used to rectify the received AC power and output it to the battery pack of the vehicle.

[0009] In some embodiments, each phase winding of the three-phase winding of the generator is respectively connected to one end of the secondary side of a transformer, and one end of the primary side of each transformer is respectively connected in series with a resonant inductor and a resonant capacitor, and the other end of the primary side of each transformer is connected in series.

[0010] In some embodiments, the relay unit includes a first switching relay and a second switching relay;

[0011] One end of the first switching relay is connected to a first endpoint, which is a connection point between a first phase winding of the three-phase winding and one end of a secondary side of the transformer; the other end of the first switching relay is connected to a second endpoint, which is a connection point between a second phase winding of the three-phase winding and one end of a secondary side of the transformer;

[0012] One end of the second switching relay is connected to the second end point; the other end of the second switching relay is connected to the third end point, and the third end point is the connection point between the third phase winding in the three-phase winding and one end of the secondary side of the transformer.

[0013] In some embodiments, the resonant circuit further includes three-phase full-bridge switch units connected in parallel, and each phase of the full-bridge switch unit includes two full-bridge switch tubes connected in series;

[0014] The connection points of the two full-bridge switch tubes included in the full-bridge switch unit of each phase are respectively connected to the resonant capacitors.

[0015] In some embodiments, the resonant circuit further includes three-phase full-bridge rectifier units connected in parallel, and each phase of the full-bridge rectifier unit includes two full-bridge switch tubes connected in series;

[0016] The connection point of the two full-bridge switch tubes included in the full-bridge rectifier unit of each phase is respectively connected to the other end of the secondary side of each transformer.

[0017] In some embodiments, the resonant circuit further includes a filter capacitor;

[0018] The filter capacitor is connected in parallel to the output end of the three-phase parallel full-bridge rectifier unit and is used for smoothing the direct current power output by the full-bridge rectifier unit.

[0019] In some embodiments, the on-board charger further includes a power factor correction circuit;

[0020] The power factor correction circuit is used to rectify the AC power energy input from the outside and input it into the resonant circuit.

[0021] In a second aspect, an embodiment of the present application provides a vehicle, comprising the on-board charger described in the first aspect.

[0022] In a third aspect, an embodiment of the present application provides a charging method for the vehicle described in the second aspect, wherein the vehicle further includes a generator, a battery pack, and a range-extending engine mechanically linked to the generator; the method includes:

[0023] Controlling the relay unit in the resonant circuit included in the on-board charger to be disconnected, so that the on-board charger operates in an extended-range power generation state;

[0024] When it is determined that the on-board charger is operating in the range-extending power generation state, based on the control voltage provided by the resonant circuit to the three-phase winding of the generator, the generator and the range-extending engine are controlled to rotate, so as to obtain AC power generated by the rotation of the range-extending engine and the generator;

[0025] The battery pack is charged after the alternating current power is rectified.

[0026] The on-board charger, vehicle and vehicle charging method provided in the embodiments of the present application operate in an extended-range power generation state by controlling the relay unit to be in an off state. At this time, the resonant circuit provides a control voltage to the three-phase winding of the generator to control the rotation of the generator and the extended-range engine mechanically linked to the generator, and rectifies and outputs the AC power generated by the rotation of the extended-range engine and the generator to the battery pack of the vehicle, thereby effectively realizing the reuse of the on-board charger as a generator controller, controlling the rotation of the generator and the extended-range engine mechanically linked to the generator to generate power, improving component utilization, and reducing vehicle cost, weight, power consumption and occupied space. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 One of the structural schematic diagrams of a vehicle charger provided in an embodiment of the present application;

[0029] Figure 2 The second structural diagram of a vehicle charger provided in an embodiment of the present application;

[0030] Figure 3 The third structural diagram of a vehicle charger provided in an embodiment of the present application;

[0031] Figure 4A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0032] Figure 5 A schematic flow chart of a vehicle charging method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] It should be noted that in the description of the embodiments of the present application, the terms "first", "second", etc. are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more.

[0035] In order to facilitate a clearer understanding of the embodiments of the present application, some related technologies are first introduced as follows.

[0036] In order to improve the range of new energy electric vehicles, the following five related technologies are currently commonly used:

[0037] The first method: Use a large-capacity battery pack to increase the upper limit of pure electric driving range.

[0038] This solution increases the vehicle's power while also increasing its weight. The heavier the vehicle body, the higher the power consumption. With the same amount of power increase, the increase in cruising range becomes smaller and smaller. The large amount of power is not used in most travel situations, reducing resource utilization. The increase in vehicle weight leads to increased power consumption, and in most short-distance usage scenarios, the vehicle's power consumption is increased in disguise (compared to vehicles with medium and low power).

[0039] The second method: using a range extender / hybrid to increase fuel endurance.

[0040] The range extender / hybrid motor is heavy, which results in a disguised increase in vehicle power consumption in most short-distance usage scenarios (compared to vehicles without range extenders). The range extender / hybrid motor is expensive, which increases vehicle costs but has a low utilization rate. The range extender / hybrid motor takes up a lot of space, which compresses the storage space available to users.

[0041] The third method: Use super fast charging to significantly increase charging power.

[0042] Super-fast charging has high requirements for battery technology, which significantly increases costs while also bringing more product life and reliability issues. Super-fast charging has high requirements for charging facilities. Currently, there are few super-charging stations and super-charging piles, which increases the difficulty for users to obtain super-charging services.

[0043] The fourth method: using battery replacement technology to reduce charging waiting time.

[0044] Due to the high degree of customization of battery packs depending on the vehicle model, battery replacement services can only be provided for some models at present, and it cannot be promoted and applied on a large scale; battery replacement stations always have battery packs waiting to be replaced, and the system design of battery replacement stations is complex and the investment is high. Currently, they can only be set up in downtown areas with intensive demand, and it is difficult to promote coverage to highways and underdeveloped areas.

[0045] Fifth method: Use an external power bank to increase the total available power of the vehicle.

[0046] The power bank system is complex and heavy, which significantly increases power consumption while increasing vehicle range; the power bank requires additional charging and maintenance after use, which is inconvenient to use; the power bank has limited capacity and cannot continuously provide power to the vehicle.

[0047] In response to the defects of the second related technology mentioned above (i.e., using a range extender / hybrid engine to increase fuel endurance), the embodiments of the present application provide an on-board charger, a vehicle, and a charging method for the vehicle, which can reuse the on-board charger as a generator controller to control the rotation of the generator and the range extender engine mechanically linked to the generator to generate electrical energy, thereby improving component utilization and reducing vehicle cost, weight, power consumption, and occupied space.

[0048] The following is an illustrative introduction to the on-board charger, vehicle and vehicle charging method provided in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application.

[0049] Figure 1 This is one of the structural diagrams of a vehicle charger provided in an embodiment of the present application, such as Figure 1 As shown, the on-board charger 101 includes a resonant circuit 102, wherein the resonant circuit 102 includes a three-phase winding 103 of a generator and a relay unit 104 connected to the three-phase winding 103;

[0050] When the relay unit 104 is in the disconnected state, the on-board charger 101 operates in the extended-range power generation state, and the resonant circuit 102 is used to provide a control voltage to the three-phase winding 103 of the generator to control the rotation of the generator and the extended-range engine mechanically linked to the generator, and to rectify the AC power generated by the rotation of the extended-range engine and the generator and output it to the battery pack of the vehicle.

[0051] In some embodiments, the on-board charger 101 includes a resonant circuit 102, and the resonant circuit 102 includes a three-phase winding 103 of a generator. It should be noted that the generator is usually three-phase electricity, so the embodiment of the present application sets the resonant circuit 102 to include a three-phase winding 103 of the generator.

[0052] It should be noted that the winding of the generator is composed of a conductor coil. When current passes through the winding, a rotating magnetic field is generated, thereby converting mechanical energy into electrical energy. Windings are generally divided into stator windings and rotor windings. The stator winding is the part of the stator with the coil wound around it, and the rotor winding is the part of the rotor with the coil wound around it. The materials of the generator winding include copper wire, aluminum wire, silver wire, etc. Among them, copper wire has better conductivity and corrosion resistance, so it is often used in the production of generator windings.

[0053] Winding plays an important role in the generator. It can not only convert mechanical energy into electrical energy, but also adjust electrical parameters such as voltage and frequency. The winding in the generator can also be divided into concentrated winding and distributed winding. Concentrated winding means that each turn of the winding is led from the positive and negative poles of the power supply, while distributed winding connects multiple windings in parallel and series. The structure of distributed winding is relatively more complicated, but it can make the motor more efficient.

[0054] As the core component of the generator, the winding has at least the following functions:

[0055] (1) Convert mechanical energy into electrical energy. The windings in the generator can convert mechanical energy into electrical energy, which is the essential function of the generator.

[0056] (2) Generate a magnetic field. The current in the winding passes through the energized wire and generates a magnetic field, which in turn generates a rotational torque that drives the rotor to rotate.

[0057] (3) Adjusting electrical parameters. By changing parameters such as the number of turns and cross-sectional area of ​​the winding, the stress on the electrical appliance can be reduced, thereby protecting the life of the appliance.

[0058] (4) Improve efficiency. Reasonable design of winding structure and materials can improve the efficiency of the generator and reduce energy consumption.

[0059] In some embodiments, the resonant circuit 102 further includes a relay unit 104 , and the relay unit 104 is electrically connected to the three-phase winding 103 of the generator.

[0060] In some embodiments, if the relay unit 104 is in the disconnected state, the on-board charger 101 operates in the extended-range power generation state. At this time, the resonant circuit 102 can provide a control voltage to the three-phase winding 103 of the generator to control the rotation of the generator and the extended-range engine mechanically linked to the generator, and rectify and output the AC power generated by the rotation of the extended-range engine and the generator to the battery pack of the vehicle, thereby charging the vehicle.

[0061] It should be noted that when using range-extending technology to improve the endurance of new energy electric vehicles, the chemical energy of the fuel is converted into mechanical energy through the range-extending engine. Since the range-extending engine and the generator are mechanically linked, the generator can be driven to rotate. Therefore, the generator can convert the mechanical energy output by the range-extending engine into electrical energy, thereby charging the vehicle's battery pack.

[0062] It should be noted that the related technology is to generate electric energy by controlling the generator and the range-extending engine mechanically linked to the generator through the generator controller; while the embodiment of the present application does not need to add an additional generator controller, but provides a control voltage to the three-phase winding 103 of the generator through the resonant circuit 102 in the on-board charger 101 to control the generator and the range-extending engine mechanically linked to the generator to generate electric energy. Therefore, the embodiment of the present application realizes the reuse of the on-board charger 101 as a generator controller, reduces the number of components, reduces the cost, weight, power consumption and occupied space of the vehicle, and improves the utilization rate of the on-board charger 101.

[0063] The on-board charger provided in the embodiment of the present application operates in the extended-range power generation state by controlling the relay unit to be in the disconnected state. At this time, the resonant circuit provides a control voltage to the three-phase winding of the generator to control the rotation of the generator and the extended-range engine mechanically linked to the generator, and rectifies and outputs the AC power generated by the rotation of the extended-range engine and the generator to the battery pack of the vehicle, effectively realizing the reuse of the on-board charger as a generator controller, controlling the rotation of the generator and the extended-range engine mechanically linked to the generator to generate electricity, improving component utilization, and reducing vehicle cost, weight, power consumption and occupied space.

[0064] In some embodiments, when the relay unit 104 is in a closed state, the onboard charger 101 operates in an AC charging state, and the resonant circuit 102 is used to rectify the received AC power and output it to the battery pack of the vehicle.

[0065] In the embodiment of the present application, if the relay unit 104 is in a closed state, the on-board charger 101 operates in an AC charging state. At this time, the resonant circuit 102 can rectify the received AC power and output it to the battery pack of the vehicle, thereby charging the vehicle.

[0066] In some embodiments, the on-board charger 101 further includes a control unit, which is used to control the closing and opening of the relay unit 104 included in the resonant circuit 102, so that the on-board charger 101 works in different states. If the control unit controls the relay unit 104 to be opened, the on-board charger 101 works in the extended range power generation state; if the control unit controls the relay unit 104 to be closed, the on-board charger 101 works in the AC charging state.

[0067] In some embodiments, the relay unit 104 included in the resonant circuit 102 is electrically connected to the control unit.

[0068] In some embodiments, each phase winding of the three-phase winding 103 of the generator is respectively connected to one end of the secondary side of a transformer, and one end of the primary side of each transformer is respectively connected in series with a resonant inductor and a resonant capacitor, and the other end of the primary side of each transformer is connected in series.

[0069] In the embodiment of the present application, each phase winding in the three-phase winding 103 of the generator is respectively connected to one end of the secondary side of a transformer, and one end of the primary side of the transformer connected to each phase winding is connected in series with a resonant inductor and a resonant capacitor, and the other end of the primary side of the transformer connected to each phase winding is connected in series with each other.

[0070] In some embodiments, the relay unit 104 includes a first switching relay and a second switching relay;

[0071] One end of the first switching relay is connected to a first endpoint, which is a connection point between a first phase winding in the three-phase winding 103 and one end of a secondary side of the transformer; the other end of the first switching relay is connected to a second endpoint, which is a connection point between a second phase winding in the three-phase winding 103 and one end of a secondary side of the transformer;

[0072] One end of the second switching relay is connected to the second end point; the other end of the second switching relay is connected to the third end point, and the third end point is the connection point between the third phase winding in the three-phase winding 103 and one end of the secondary side of the transformer.

[0073] In an embodiment of the present application, a first switching relay and a second switching relay are provided in the relay unit 104, and two end points of the first switching relay are respectively connected to the connection between the first phase winding in the three-phase winding 103 of the generator and one end of the secondary side of the transformer and the connection between the second phase winding in the three-phase winding 103 of the generator and one end of the secondary side of the transformer, and two end points of the second switching relay are respectively connected to the connection between the second phase winding in the three-phase winding 103 of the generator and one end of the secondary side of the transformer and the connection between the third phase winding in the three-phase winding 103 of the generator and one end of the secondary side of the transformer.

[0074] In some embodiments, the first switching relay and the second switching relay may be implemented as semiconductor switches.

[0075] In some embodiments, the resonant circuit 102 further includes three-phase full-bridge switch units connected in parallel, and each phase of the full-bridge switch unit includes two full-bridge switch tubes connected in series;

[0076] The connection points of the two full-bridge switch tubes included in the full-bridge switch unit of each phase are respectively connected to the resonant capacitors.

[0077] In an embodiment of the present application, a three-phase parallel full-bridge switch unit is also provided in the resonant circuit 102, and each phase full-bridge switch unit includes two full-bridge switch tubes connected in series, and the connection point of the two full-bridge switch tubes connected in series is connected to the resonant capacitor connected in series at one end of the primary side of the transformer.

[0078] In some embodiments, the resonant circuit 102 further includes three-phase full-bridge rectifier units connected in parallel, and each phase of the full-bridge rectifier unit includes two full-bridge switch tubes connected in series;

[0079] The connection point of the two full-bridge switch tubes included in the full-bridge rectifier unit of each phase is respectively connected to the other end of the secondary side of each transformer.

[0080] In an embodiment of the present application, a three-phase parallel full-bridge rectifier unit is also provided in the resonant circuit 102, and each phase full-bridge rectifier unit includes two full-bridge switching tubes connected in series, and the connection point of the two full-bridge switching tubes in series is connected to the other end of the secondary side of the transformer connected to the winding of the generator, wherein one end of the secondary side of the transformer is connected to the winding of the generator.

[0081] It can be understood that based on the resonant circuit 102 provided in the embodiment of the present application, if the relay unit 104 in the resonant circuit 102 is disconnected, that is, the first switching relay and the second switching relay are both disconnected, then the full-bridge switch tube constituting the full-bridge rectifier unit in the resonant circuit 102 can provide a control voltage to the three-phase winding 103 of the generator, thereby driving the generator to start rotating. Since the generator and the range-extending engine are mechanically linked, the speed of the range-extending engine can also be indirectly driven to increase. When the speed of the range-extending engine rises to a certain range, fuel injection ignition can be carried out smoothly, and it enters its working output state. After the range-extending engine enters the working output state, the full-bridge switch tube in the full-bridge rectifier unit enters the power generation control state, rectifies the electric energy output by the three-phase winding of the generator and outputs it to the battery pack of the vehicle, thereby realizing range-extending power generation.

[0082] It should be noted that the full-bridge rectifier unit can rectify AC power into DC power and output it to the vehicle's battery pack to charge the vehicle.

[0083] In some embodiments, the resonant circuit 102 further includes a filter capacitor;

[0084] The filter capacitor is connected in parallel to the output end of the three-phase parallel full-bridge rectifier unit and is used for smoothing the direct current power output by the full-bridge rectifier unit.

[0085] In an embodiment of the present application, a filter capacitor is also provided in the resonant circuit 102. The filter capacitor is connected in parallel to the output end of the full-bridge rectifier unit and is used to smooth the DC power output by the full-bridge rectifier unit before outputting it to the battery pack of the vehicle to charge the vehicle.

[0086] It should be noted that the filter capacitor can reduce the sudden change and jitter of the DC power signal output by the full-bridge rectifier unit and improve the stability of the circuit.

[0087] In some embodiments, the on-board charger 101 further includes a power factor correction (PFC) circuit;

[0088] The power factor correction circuit is used to rectify the AC power input from the outside and input it into the resonant circuit 102.

[0089] In the embodiment of the present application, a PFC circuit is further provided in the on-board charger 101 , and the PFC circuit can be used to rectify the AC power input from the outside and input it into the resonant circuit 102 .

[0090] In some embodiments, the PFC circuit is electrically connected to the resonant circuit 102 .

[0091] It should be noted that the main function of the PFC circuit is to reduce the phase difference between the current and voltage of the power supply by adjusting the waveform of the input voltage, thereby improving the power factor. The PFC circuit can make the power factor of the power supply system close to 1, which means that the power supply can use electricity more efficiently and reduce energy waste.

[0092] For example, Figure 2 The second structural diagram of a vehicle charger provided in an embodiment of the present application is as follows: Figure 2 As shown, the switching relays K1 and K2 are closed, which allows the on-board charger to work in the AC charging state. In this state, the battery pack relay of the vehicle is in a closed state, HV+ and HV- are connected to the positive and negative poles of the battery pack, and the three-phase live wires L1, L2, L3 and the neutral wire N are connected to the external power grid. The PFC circuit rectifies the electric energy input from the external power grid and outputs it to the busbars Ulink1+ and Ulink1-. The resonant circuit (also called LLC circuit, i.e. Figure 2 The circuit connected to the output end of the PFC circuit) converts the power of the bus to HV+ and HV-, thereby charging the battery pack of the vehicle.

[0093] exist Figure 2 In the LLC circuit, the full-bridge switch tubes Q1-Q12, resonant capacitors Cr1-Cr3, resonant inductors Lr1-Lr3, generator winding inductors Lu, Lv, Lw, transformers T1-T3, filter capacitors C3 and switching relays K1 and K2 are included. Since K1 and K2 are in the closed state, the connection points U, V and W of the three-phase winding of the generator (i.e., the three-phase ports of the generator) are in a short-circuit state and do not participate in the circuit operation.

[0094] It should be noted that Figure 2 The generator winding inductance Lu, Lv, Lw in is equivalent to the three-phase winding of the generator mentioned above.

[0095] It should be noted that in the embodiment of the present application, the closing of the switching relays K1 and K2 will not cause direct electrical connection between the primary and secondary sides of the transformers T1 to T3, which is safer.

[0096] In some embodiments, the switching relays K1 and K2 may be implemented as semiconductor switches.

[0097] For example, Figure 3 The third structural diagram of a vehicle charger provided in the embodiment of the present application is as follows: Figure 3 As shown, the switching relays K1 and K2 are disconnected, so that the on-board charger can work in the extended range power generation state. In this state, the battery pack relay of the vehicle is in a closed state, HV+ and HV- are connected to the positive and negative poles of the battery pack, and the three-phase live wires L1, L2, L3 and the neutral wire N are not connected to the external power grid.

[0098] In the initial state, the range-extended engine is not started and the speed is zero. It needs to be driven externally to reach a certain speed before it can ignite and enter the working state. At this time, the three-phase full-bridge switch tubes Q1~Q6 are controlled to provide control voltage to the generator, driving the generator to start rotating. Since the generator and the range-extended engine are mechanically linked, the speed of the range-extended engine can also be indirectly driven to increase. When the speed of the range-extended engine rises to a certain range, fuel injection ignition can be carried out smoothly, and it enters its working output state. After the range-extended engine enters the working output, the three-phase full-bridge switch tubes Q1~Q6 are transferred to the power generation control state, and the electric energy output by the three-phase winding of the generator is rectified and given to the busbars HV+ and HV1-, reaching the positive and negative poles of the battery pack, thereby realizing extended-range power generation.

[0099] It should be noted that the embodiment of the present application can make the on-board charger work in the extended-range power generation state or the AC charging state only by switching the switches of two switching relays. The number of switching relays used is small, the cost is low, and the reliability is high. Moreover, when the on-board charger is performing extended-range power generation, the switching relay is in the disconnected state, there is no driving energy consumption, which reduces the total energy consumption and indirectly improves the extended-range power generation efficiency.

[0100] It can be understood that the embodiment of the present application reuses the secondary side switch tubes Q1~Q6 of the three-phase LLC circuit for generator control through switch switching, thereby realizing the reuse of the on-board charger as a generator controller, improving the integration of the extended-range technology, reducing the number of components, improving component utilization, reducing vehicle cost, weight, power consumption and occupied space, and improving user experience.

[0101] In addition, an embodiment of the present application also provides a vehicle, which includes the above-mentioned on-board charger, so as to charge a battery pack of the vehicle through the on-board charger.

[0102] For example, Figure 4 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, the vehicle 401 includes: an on-board charger 402, a generator 403, a range extender engine 404, a fuel tank 405, a battery pack 406, an electric drive system 407 and an AC charging port 408. The fuel tank 405 is used to store fuel to provide the range extender engine 404 with fuel for continuous operation; the range extender engine 404 is used to convert the chemical energy of the fuel into mechanical energy to drive the generator 403 to rotate, and the generator 403 converts the mechanical energy into electrical energy.

[0103] It should be noted that, unlike the typical range-extended electric vehicles, the embodiment of the present application removes the generator controller, and the on-board charger 402 realizes the power generation and rectification control. The electric energy output by the generator 403 here is three-phase AC, which is provided to the on-board charger 402 to realize the charging of the battery pack 406. At the same time, the inverter output function of the on-board charger 402 can be reused in the embodiment of the present application to drive the start of the generator 403 and the range-extended engine 404.

[0104] During AC charging while parked, the range-extending engine 404 and the generator 403 do not need to be started, and the on-board charger 402 works in the AC charging state, and obtains AC power from the outside through the AC charging port 408 to charge the battery pack 406 of the vehicle 401; during AC discharging while parked, the range-extending engine 404 and the generator 403 do not need to be started, and the on-board charger 402 works in the AC discharging state, and inverts the power of the battery pack 406 of the vehicle 401 and outputs it to the external AC load of the vehicle 401; when the range-extending engine 404 is not started while driving, the on-board charger 402 does not work, and the battery pack 406 supplies power to the electric drive system 407, so that the vehicle 401 can work and drive; when the range-extending engine 404 is started while driving, the on-board charger 402 works in the range-extending power generation state, and after the range-extending engine 404 is started, the AC power output by the generator 403 is rectified and output to the battery pack 406 of the vehicle 401, so as to realize the charging and range-extending function. In each working stage, the working states of the on-board charger 402 do not overlap, thus achieving component reuse and reducing vehicle cost, weight, power consumption and occupied space.

[0105] The following is an introduction to the vehicle charging method provided in the embodiment of the present application.

[0106] Figure 5 A schematic diagram of a vehicle charging method provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, the method includes:

[0107] S501, controlling a relay unit in a resonant circuit included in the on-board charger to be disconnected, so that the on-board charger operates in an extended-range power generation state.

[0108] It should be noted that the vehicle in the embodiment of the present application includes the on-board charger in the above embodiment, and also includes a generator, a battery pack, and a range-extending engine mechanically linked to the generator.

[0109] In some embodiments, a relay unit is provided in the resonant circuit, and the closing and opening of the relay unit can be controlled so that the on-board charger works in different states. If the relay unit is controlled to be opened, the on-board charger can work in the extended range power generation state; if the relay unit is controlled to be closed, the on-board charger can work in the AC charging state.

[0110] S502: When it is determined that the on-board charger is operating in the extended-range power generation state, based on the control voltage provided by the resonant circuit to the three-phase winding of the generator, control the rotation of the generator and the extended-range engine to obtain AC power generated by the rotation of the extended-range engine and the generator.

[0111] In some embodiments, since the resonant circuit includes a three-phase winding of a generator, when it is determined that the on-board charger is operating in an extended-range power generation state, the resonant circuit can provide a control voltage to the three-phase winding of the generator to control the rotation of the generator and the extended-range engine mechanically linked to the generator, thereby obtaining AC power generated by the rotation of the extended-range engine and the generator.

[0112] In some embodiments, if the relay unit in the resonant circuit is disconnected, the full-bridge switch tube constituting the full-bridge rectifier unit in the resonant circuit can provide a control voltage to the three-phase winding of the generator, thereby driving the generator to start rotating. Since the generator and the range-extended engine are mechanically linked, the speed of the range-extended engine can be indirectly driven to increase, thereby generating AC power.

[0113] S503: Rectify the AC power and charge the battery pack.

[0114] In some embodiments, the AC power generated by the rotation of the range-extending engine and the generator may be rectified and output to the battery pack of the vehicle, thereby achieving range-extended power generation.

[0115] In some embodiments, a rectifier circuit can be used to convert the AC power generated by the rotation of the range extender engine and the generator into DC power and then output it to the battery pack of the vehicle, thereby charging the vehicle.

[0116] It can be understood that the vehicle charging method provided in the embodiment of the present application controls the relay unit in the resonant circuit to be disconnected so that the on-board charger operates in the extended-range power generation state, and when it is determined that the on-board charger operates in the extended-range power generation state, based on the control voltage provided by the resonant circuit to the three-phase winding of the generator, controls the rotation of the generator and the extended-range engine mechanically linked to the generator to obtain the AC power generated by the rotation of the extended-range engine and the generator, and then rectifies the AC power to charge the battery pack of the vehicle, effectively realizing the reuse of the on-board charger as a generator controller, controlling the rotation of the generator and the extended-range engine mechanically linked to the generator to generate electricity, thereby improving component utilization and reducing vehicle cost, weight, power consumption and occupied space.

[0117] In addition, it should be noted that the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0118] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the embodiments of the present application may adopt the form of hardware embodiments, software embodiments, or embodiments in combination with software and hardware. Moreover, the embodiments of the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) that contain computer-usable program code.

[0119] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0120] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0121] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0122] The above description is merely an optional embodiment of the present application and is not intended to limit the protection scope of the present application.

Claims

1. A vehicle-mounted charger, characterized in that: include: A resonant circuit, wherein the resonant circuit comprises a three-phase winding of a generator and a relay unit connected to the three-phase winding; When the relay unit is in the disconnected state, the on-board charger operates in the extended-range power generation state, and the resonant circuit is used to provide a control voltage to the three-phase winding of the generator to control the rotation of the generator and the extended-range engine mechanically linked to the generator, and rectify the AC power generated by the rotation of the extended-range engine and the generator and output it to the battery pack of the vehicle, so as to realize the multiplexing of the on-board charger as a generator controller to control the generator and the extended-range engine to perform extended-range power generation.

2. The vehicle-mounted charger according to claim 1, characterized in that: When the relay unit is in a closed state, the on-board charger operates in an AC charging state, and the resonant circuit is used to rectify the received AC power and output it to the battery pack of the vehicle.

3. The vehicle-mounted charger according to claim 1, characterized in that: Each phase winding of the three-phase winding of the generator is respectively connected to one end of the secondary side of a transformer, and one end of the primary side of each transformer is respectively connected in series with a resonant inductor and a resonant capacitor, and the other end of the primary side of each transformer is connected in series.

4. The vehicle-mounted charger according to claim 3, characterized in that: The relay unit includes a first switching relay and a second switching relay; One end of the first switching relay is connected to a first end point, and the first end point is a connection point between a first phase winding of the three-phase winding and one end of a secondary side of the transformer; The other end of the first switching relay is connected to a second end point, and the second end point is a connection point between the second phase winding of the three-phase winding and one end of the secondary side of the transformer; One end of the second switching relay is connected to the second end point; the other end of the second switching relay is connected to the third end point, and the third end point is the connection point between the third phase winding in the three-phase winding and one end of the secondary side of the transformer.

5. The vehicle-mounted charger according to claim 4, characterized in that: The resonant circuit also includes three-phase full-bridge switch units connected in parallel, and each phase of the full-bridge switch unit includes two full-bridge switch tubes connected in series; The connection points of the two full-bridge switch tubes included in the full-bridge switch unit of each phase are respectively connected to the resonant capacitors.

6. The vehicle-mounted charger according to claim 4, characterized in that: The resonant circuit also includes three-phase full-bridge rectifier units connected in parallel, and each phase of the full-bridge rectifier unit includes two full-bridge switch tubes connected in series; The connection point of the two full-bridge switch tubes included in the full-bridge rectifier unit of each phase is respectively connected to the other end of the secondary side of each transformer.

7. The vehicle-mounted charger according to claim 6, characterized in that: The resonant circuit also includes a filter capacitor; The filter capacitor is connected in parallel to the output end of the three-phase parallel full-bridge rectifier unit and is used for smoothing the direct current power output by the full-bridge rectifier unit.

8. The vehicle-mounted charger according to any one of claims 1 to 7, characterized in that: The on-board charger also includes a power factor correction circuit; The power factor correction circuit is used to rectify the AC power energy input from the outside and input it into the resonant circuit.

9. A vehicle, characterized in that: The vehicle comprises the on-board charger according to any one of claims 1 to 8.

10. A charging method for the vehicle according to claim 9, characterized in that: The vehicle further includes a generator, a battery pack, and a range-extending engine mechanically linked to the generator; the method includes: Controlling the relay unit in the resonant circuit included in the on-board charger to be disconnected, so that the on-board charger operates in an extended-range power generation state; When it is determined that the on-board charger is operating in the extended-range power generation state, the generator and the extended-range engine are controlled to rotate based on the control voltage provided by the resonant circuit to the three-phase winding of the generator to obtain AC power generated by the rotation of the extended-range engine and the generator; the battery pack is charged after rectifying the AC power.

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