Vehicle charging apparatus and vehicle

Abstract

The present application relates to the field of vehicle charging and provides a vehicle charging apparatus and a vehicle. The vehicle charging apparatus reuses a rectifier circuit and an isolated converter in a vehicle wired charging apparatus, an output terminal of the rectifier circuit being connected to an input terminal of the isolated converter, and an output terminal of the isolated converter being connected to a vehicle battery. On this basis, a wireless charging receiver and a switch device are added at the front end of the rectifier circuit. Specifically, the wireless charging receiver is connected to the input terminal of the rectifier circuit by means of the switch device. Wireless charging of the vehicle can be implemented by controlling the switch device to be turned on. Since the isolated converter in the vehicle wired charging apparatus is reused, a voltage regulation function can be realized, voltage requirements of different vehicle batteries are met, and support is provided for adapting to different vehicle batteries for wireless charging.

Description

Vehicle charging device and vehicle

[0001] This application claims priority to Chinese Patent Application No. 202422788581.1, filed on November 15, 2024, entitled "Vehicle Charging Device and Vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of vehicle charging, and more particularly to a vehicle charging device and a vehicle. Background Technology

[0003] Wireless charging technology has been widely used in charging mobile phones, computers, and other terminal devices. With the increasing number of new energy vehicles, wireless charging technology for these vehicles will also develop rapidly. Vehicles will use wireless charging devices installed on them to wirelessly charge their power batteries, providing users with convenient vehicle charging.

[0004] Due to differences in manufacturers, vehicle models, or powertrain types, the rated voltage of batteries in new energy vehicles varies; for example, the rated voltage of a battery pack may be 400V or 800V. Currently, existing wireless charging devices are not compatible with the batteries of different vehicles. Summary of the Invention

[0005] This application provides a vehicle charging device and a vehicle, supporting wireless charging of batteries adapted to different vehicles.

[0006] In a first aspect, embodiments of this application provide a vehicle charging device, including: a wired charging device and a first wireless charging device; the wired charging device includes a first rectifier circuit and an isolated converter, and the first wireless charging device includes a first rectifier circuit, an isolated converter, a wireless charging receiver, and a switching device; the wireless charging receiver is connected to the input terminal of the first rectifier circuit through the switching device, the input terminal of the isolated converter is connected to the output terminal of the first rectifier circuit, and the output terminal of the isolated converter is connected to the vehicle battery.

[0007] A wireless charging receiver generates a first alternating current in response to a change in the magnetic field; a first rectifier circuit converts the first alternating current into a first direct current; and an isolated converter converts the first direct current into a second direct current, the voltage of which meets the voltage requirements of the battery.

[0008] Wired charging devices can also be called on-board chargers. Wireless charging receivers include a receiving coil, which senses changes in the magnetic field to generate a first alternating current.

[0009] The aforementioned vehicle charging device can be applied to the vehicle itself. The first wireless charging unit in the vehicle charging device reuses components from the wired charging device, such as the first rectifier circuit and the isolated converter. A switching device and a wireless charging receiver are added before the first rectifier. By controlling the conduction of the switching device, the vehicle's wireless charging function is achieved. Because existing components in the vehicle are reused, the cost of designing the vehicle's wireless charging device can be reduced, and the space occupied by the wireless charging device in the vehicle can be minimized. During the wireless charging process, the rectification function is achieved by reusing the rectifier circuit from the wired charging device, and the voltage regulation function is achieved by reusing the isolated converter from the wired charging device, thereby meeting the voltage requirements of different batteries and providing support for wireless charging of batteries from different vehicles.

[0010] In an alternative embodiment of the first aspect, the isolated converter includes any of the following: an LLC resonant converter, or a CLLC resonant converter, or a phase-shifted full-bridge converter. The isolated converter serves to isolate the input and output circuits, achieving electrical isolation and power transfer.

[0011] In one alternative embodiment of the first aspect, the isolated converter includes: a first inverter circuit, a transformer, and a second rectifier circuit; the input terminal of the first inverter circuit is connected to the output terminal of the first rectifier circuit, the output terminal of the first inverter circuit is connected to the input terminal of the transformer, and the output terminal of the transformer is connected to the input terminal of the second rectifier circuit.

[0012] In practical applications, the vehicle's first controller controls the switching frequency of the first inverter circuit in the isolated converter to convert the first DC power into a second DC power. The switching frequency is determined based on the battery voltage. For example, the first controller adjusts the switching frequency of the thyristor devices in the first inverter of the isolated converter according to the battery voltage. When the battery voltage is too high (e.g., exceeding threshold 1), the first controller increases the switching frequency to decrease the battery voltage; when the battery voltage is too low (e.g., below threshold 2), the first controller decreases the switching frequency to increase the battery voltage, thus regulating the battery charging voltage.

[0013] The first controller can regulate the battery voltage by controlling the switching frequency of the thyristor devices in the isolated converter, thus preventing the battery voltage from being too low or too high.

[0014] In an optional embodiment of the first aspect, the vehicle charging device further includes: a first current detection device, disposed between the switching device and the first rectifier circuit, the first current detection device being used to detect the current value of the first alternating current.

[0015] In practical applications, the vehicle's first controller obtains the current value of the first AC power from the first current detection device. When the current value of the first AC power is greater than the first threshold, the first controller can control the conduction or cutoff of the thyristor device in the first rectifier circuit to prevent the current value of the first AC power flowing into the first rectifier circuit from being too large and damaging the device, thereby realizing the overcurrent protection function.

[0016] For example, the first rectifier circuit is a two-phase bridge rectifier circuit. Referring to Figure 6, the first current detection device 23 detects the current value of the first AC current flowing into the midpoint of the first bridge arm of the first rectifier 11. The first bridge arm is connected in series with thyristor devices Q1 and Q3. When the current value at the first AC point is greater than the first threshold, the first controller (not shown in the figure) controls the thyristor devices Q1 and Q4 in the first rectifier circuit 11 to turn on, and controls the thyristor devices Q2 and Q3 in the first rectifier circuit 11 to turn off, thereby realizing overcurrent protection.

[0017] In an alternative embodiment of the first aspect, the vehicle charging device further includes: a second current detection device disposed between the isolated converter and the battery, the second current detection device being used to detect the current value of the battery.

[0018] In practical applications, the vehicle's first controller obtains the battery current value from the second current sensing device. When the battery current value exceeds a second threshold, the first controller can control the first inverter in the battery front-end isolated converter to shut down, preventing excessive battery charging current from damaging the battery and thus achieving overcurrent protection. Controlling the first inverter to shut down can refer to controlling the shutdown of all thyristor devices within the first inverter.

[0019] In one alternative embodiment of the first aspect, the first rectifier circuit includes: a three-phase bridge rectifier circuit, or a two-phase bridge rectifier circuit.

[0020] In an optional embodiment of the first aspect, the switching device includes: a connector, a first switch, and a second switch; one end of the connector is connected to a wireless charging receiver, and the other end of the connector is connected to the input terminal of a first rectifier circuit via the first and second switches. During wireless charging, the first and second switches are turned on; during wired charging, the first and second switches are turned off.

[0021] In some embodiments, the switching device may also be other types of control switches, such as double-pole double-throw switches, as long as they have the function of turning on or off the circuit connection between the wireless charging receiver and the first rectifier circuit.

[0022] In practical applications, the vehicle's first controller enables wireless charging by simultaneously turning on the first and second switches in the switching device. Wired charging is achieved by simultaneously turning off the first and second switches in the switching device.

[0023] Secondly, embodiments of this application provide a vehicle charging device, including: a second wireless charging device; the second wireless charging device includes a third rectifier circuit, a wireless charging receiver, and a switching device; the third rectifier circuit is a rectifier circuit in the vehicle's electric drive controller or range extender controller; the wireless charging receiver is connected to the third rectifier circuit through the switching device, and the output terminal of the third rectifier circuit is connected to the vehicle battery.

[0024] The wireless charging receiver generates a first alternating current in response to changes in the magnetic field; the third rectifier circuit converts the first alternating current into a second direct current, the current value of which meets the current requirements of the vehicle battery.

[0025] The wireless charging receiver includes a receiving coil, which senses changes in the magnetic field and generates a first alternating current.

[0026] The aforementioned vehicle charging device can be applied to the vehicle itself. The second wireless charging device in the vehicle charging device reuses the rectifier circuit in the electric drive controller or range extender controller, and adds a switching device and a wireless charging receiver at the front end of this rectifier circuit. By controlling the conduction of the switching device, the vehicle's wireless charging function is realized. Reusing existing components in the vehicle reduces the cost of designing the wireless charging device and also minimizes the space occupied by the wireless charging device. By reusing the rectifier circuit in the electric drive controller or range extender controller to achieve the rectification function, the second wireless charging device is suitable for high-power wireless charging scenarios, achieving wireless charging power from 60kW to 120kW.

[0027] In an alternative embodiment of the second aspect, the third rectifier circuit is a three-phase bridge rectifier circuit; the wireless charging receiver is connected to the midpoint of any two bridge arms of the third rectifier circuit via a switching device.

[0028] For example, referring to Figure 10, the wireless charging receiver 21 is connected to the midpoint of the first and second bridge arms in the third rectifier circuit 41 via a switching device 22. Q1 and Q2 are connected in series on the first bridge arm, and Q3 and Q4 are connected in series on the second bridge arm.

[0029] Three-phase bridge rectifier circuits are superior to two-phase bridge rectifier circuits in terms of electrical performance, especially in terms of rectification effect, where the three-phase bridge rectifier circuit has higher rectification efficiency and more stable output.

[0030] In an alternative embodiment of the second aspect, the vehicle charging device further includes: a third current detection device disposed between the switching device and the third rectifier circuit, the third current detection device being used to detect the current value of the first alternating current.

[0031] In an optional embodiment of the second aspect, the two bridge arms connected to the switching devices in the third rectifier circuit include a first bridge arm and a second bridge arm; a first thyristor and a second thyristor are connected in series on the first bridge arm, and a third thyristor and a fourth thyristor are connected in series on the second bridge arm. The first and third thyristors share a common anode, and the second and fourth thyristors share a common cathode. A third current detection device is used to detect the current value of the first alternating current flowing into the midpoint of the first bridge arm.

[0032] In practical applications, the vehicle's second controller obtains the current value of the first AC power from the third current detection device. When the current value of the first AC power is greater than the third threshold, the second controller controls the second and third thyristor devices to turn on and controls the first and fourth thyristor devices to turn off; or, when the current value of the first AC power is less than the fourth threshold, the second controller controls the first and fourth thyristor devices to turn on and controls the second and fourth thyristor devices to turn off; wherein, the third threshold is greater than the fourth threshold.

[0033] For example, the third threshold is i1, the fourth threshold is -i1, and i1 is a positive number. Referring to Figure 10, the first bridge arm of the third rectifier circuit 41 includes a first thyristor Q1 and a second thyristor Q2 connected in series, and the second bridge arm of the third rectifier circuit 41 includes a third thyristor Q3 and a fourth thyristor Q4 connected in series. When the current value of the first AC current flowing into the midpoint of the first bridge arm is greater than i1, the second controller (not shown in the figure) controls Q2 and Q3 to conduct and Q1 and Q4 to turn off; when the current value of the first AC current flowing into the midpoint of the first bridge arm is less than -i1, the second controller controls Q1 and Q4 to conduct and Q2 and Q4 to turn off.

[0034] The vehicle's second controller monitors the current value of the first AC power flowing into the third rectifier circuit. By controlling the conduction or cutoff of some thyristor devices in the third rectifier circuit, it can adjust the magnitude of the second DC power output by the third rectifier circuit, thereby achieving current regulation and protecting the battery.

[0035] In an alternative embodiment of the second aspect, the switching device includes: a connector, a first switch, and a second switch; one end of the connector is connected to a wireless charging receiver, and the other end of the connector is connected to the input terminal of a third rectifier circuit via the first and second switches. During wireless charging, the first and second switches are turned on; during wired charging, the first and second switches are turned off.

[0036] In some embodiments, the switching device may also be other forms of control switch, such as a double-pole double-throw switch, as long as it has the function of turning on or off the circuit connection between the wireless charging receiver and the third rectifier circuit.

[0037] In practical applications, the vehicle's second controller enables wireless charging by simultaneously turning on the first and second switches in the switching device. Wired charging is achieved by simultaneously turning off the first and second switches in the switching device.

[0038] Thirdly, embodiments of this application provide a vehicle charging device, comprising: a fourth rectifier circuit, a second inverter circuit, N switches, and N transmitting coils, where N is a positive integer greater than 1; the input terminal of the fourth rectifier circuit is connected to the power grid, the output terminal of the fourth rectifier circuit is connected to the input terminal of the second inverter circuit, and the output terminal of the second inverter circuit is connected to each of the N transmitting coils, with a switch provided between each transmitting coil and the second inverter circuit. The fourth rectifier circuit is used to convert the second alternating current from the power grid into a third direct current; the second inverter circuit is used to convert the third direct current into a third alternating current; and the transmitting coils are used to generate a magnetic field change based on the third alternating current.

[0039] In practical applications, the third controller at the charging station controls the switch corresponding to the target transmitting coil to be turned on based on the target vehicle's location. The target vehicle is the vehicle undergoing wireless charging, and the target transmitting coil is the transmitting coil corresponding to the target vehicle's location.

[0040] The number of coil turns in the N transmitting collars can be the same.

[0041] In some embodiments, the fourth rectifier circuit is a two-phase bridge rectifier circuit or a three-phase bridge rectifier circuit.

[0042] The aforementioned vehicle charging device can be applied to charging piles. Multiple parking spaces can share a single rectifier circuit (i.e., the fourth rectifier circuit) and inverter circuit (i.e., the second inverter circuit), which can reduce the cost of the vehicle charging device at the charging pile. When vehicles in multiple parking spaces need wireless charging, the third controller at the charging pile can control the conduction of multiple corresponding switches to cause the transmitting coil in the corresponding parking space to generate a magnetic field change, thereby enabling simultaneous wireless charging for multiple vehicles.

[0043] Fourthly, embodiments of this application provide a vehicle, including a vehicle charging device as described in either the first or second aspect.

[0044] The fourth aspect of this application corresponds to the technical solution of the first or second aspect of this application, and the beneficial effects obtained are similar, so it will not be described again here. Attached Figure Description

[0045] Figure 1 is a schematic diagram of the structure of a wired charging device provided in an embodiment of this application;

[0046] Figure 2 is a schematic diagram of a specific structure of the wired charging device shown in Figure 1;

[0047] Figure 3 is a schematic diagram of a vehicle wireless charging scenario provided in an embodiment of this application;

[0048] Figure 4 is a structural schematic diagram of a vehicle charging device applied to a vehicle end according to an embodiment of this application;

[0049] Figure 5 is a schematic diagram of an isolated converter provided in an embodiment of this application;

[0050] Figure 6 is a schematic diagram of a specific structure of the vehicle charging device shown in Figure 4.

[0051] Figure 7 is a structural schematic diagram of a vehicle charging device applied to a vehicle end according to an embodiment of this application;

[0052] Figure 8 is a flowchart of a charging control method provided in an embodiment of this application;

[0053] Figure 9 is a structural schematic diagram of a vehicle charging device applied to a vehicle end according to an embodiment of this application;

[0054] Figure 10 is a schematic diagram of a specific structure of the vehicle charging device shown in Figure 9;

[0055] Figure 11 is a structural schematic diagram of a vehicle charging device applied to a vehicle end according to an embodiment of this application;

[0056] Figure 12 is a flowchart of a charging control method provided in an embodiment of this application;

[0057] Figure 13 is a structural schematic diagram of a vehicle charging device applied to a pile end according to an embodiment of this application;

[0058] Figure 14 is a schematic diagram of a vehicle wireless charging scenario provided in an embodiment of this application;

[0059] Figure 15 is an interactive schematic diagram of wireless charging for a vehicle provided in an embodiment of this application. Detailed Implementation

[0060] With the increasing popularity of new energy vehicles, more and more users are purchasing electric vehicles or hybrid electric vehicles. Currently, the common charging method for new energy vehicles is wired charging. Users can find a power interface at a dedicated charging station or charging pile, connect their car to the charging pile, and start charging.

[0061] In wired charging, the vehicle's battery can be charged via a wired charging device installed on it. In some embodiments, the wired charging device may also be referred to as an on-board charger (OBC).

[0062] Figure 1 is a schematic diagram of a wired charging device provided in an embodiment of this application. As shown in Figure 1, the wired charging device includes: a front-end power factor correction (PFC) rectifier circuit and a rear-end isolated converter. The PFC rectifier circuit is used to convert AC power from the grid into DC power. The isolated converter is used to convert the DC power output from the PFC rectifier circuit into the DC power required by the vehicle battery, while realizing constant current / constant voltage charging function and ensuring electrical insulation between the AC high-voltage side and the DC high-voltage side. The isolated converter can be an LLC resonant converter, a CLLC resonant converter, or a phase-shifted full-bridge converter.

[0063] Figure 2 is a schematic diagram of a specific structure of the wired charging device shown in Figure 1. The PFC rectifier circuit shown in Figure 2 is a two-phase bridge rectifier circuit, which may include: a capacitor L1, a first bridge arm and a second bridge arm. Two thyristors (Q1 and Q2 in Figure 2) are connected in series on the first bridge arm, and two thyristors (Q3 and Q4 in Figure 2) are connected in series on the second bridge arm. The capacitor L1 is connected to the midpoint of the first bridge arm. The thyristors can be field-effect transistors (MOSFETs) with damping diodes.

[0064] The isolated converter shown in Figure 2 is a CLLC resonant converter, which may include: a filter capacitor C. bus1 Inverter bridge arm, resonant capacitor C1, transformer T r Resonant capacitor C2, rectifier bridge arm, filter capacitor C bus2 The inverter arm comprises four thyristor devices (Q5 to Q8 in Figure 2), used to convert direct current (DC) to alternating current (AC). The rectifier arm comprises four thyristor devices (Q9 to Q8 in Figure 2). 12 The rectifier bridge arm is used to convert alternating current (AC) to direct current (DC). Transformer T r The turns ratio of the primary and secondary coils is m:n, and the transformer is used to change the AC voltage. Based on the above structure, the CLLC resonant converter converts the bus voltage V0 obtained after rectification by the PFC rectifier circuit into a charging voltage V1 that meets the requirements of the vehicle battery.

[0065] With the development of wireless charging technology, it can be applied not only to charging mobile phones, watches, and other terminal devices, but also to charging new energy vehicles. Wireless charging technology charges the device based on the principle of electromagnetic induction. The charging device can contain a primary coil (also called a transmitting coil), and the device to be charged can contain a secondary coil (also called a receiving coil). When current flows through the primary coil, it generates a change in magnetic field. This change induces a voltage in the nearby secondary coil, which in turn generates an induced current to charge the device.

[0066] Figure 3 is a schematic diagram of a vehicle wireless charging scenario provided by an embodiment of this application. As shown in Figure 3, the charging device may include a charging pile and a transmitting coil installed on the ground or in a parking space. The device to be charged is a vehicle, and a receiving coil is installed on the bottom of the vehicle. The receiving coil is connected to the vehicle battery through a rectifier circuit. During wireless charging, the charging pile transmits alternating current to the transmitting coil, causing a change in the magnetic field of the transmitting coil. The receiving coil on the bottom of the vehicle responds to the change in the magnetic field, generating an induced current. This current is then rectified by the rectifier circuit to charge the vehicle battery, thus realizing the transfer of electrical energy.

[0067] Considering that existing vehicles are already equipped with the aforementioned wired charging devices, when designing wireless charging devices for vehicle applications, it is possible to reuse the circuit components in the existing wired charging devices to achieve wireless charging functionality. This would not only reduce the cost of vehicle charging devices but also minimize the space occupied by the vehicle charging devices.

[0068] The following is a detailed description of a vehicle charging device provided in an embodiment of this application, with reference to Figure 4.

[0069] Figure 4 is a structural schematic diagram of a vehicle charging device applied to a vehicle according to an embodiment of this application. As shown in Figure 4, the vehicle charging device includes: a wired charging device 10 and a first wireless charging device 20; the wired charging device 10 includes a first rectifier circuit 11 and an isolated converter 12, and the first wireless charging device includes a first rectifier circuit 11, an isolated converter 12, a wireless charging receiver 21, and a switching device 22.

[0070] The wireless charging receiver 21 is connected to the input terminal of the first rectifier circuit 11 via the switching device 22, the input terminal of the isolated converter 12 is connected to the output terminal of the first rectifier circuit 11, and the output terminal of the isolated converter 12 is connected to the vehicle battery.

[0071] The wireless charging receiver 21 generates a first alternating current in response to changes in the magnetic field; the first rectifier circuit 11 converts the first alternating current into a first direct current; and the isolated converter 12 converts the first direct current into a second direct current, wherein the voltage value of the second direct current meets the voltage requirements of the battery.

[0072] In practical applications, during wireless charging, the vehicle's first controller turns on the switching device. During wired charging, the first controller turns off the switching device.

[0073] In the vehicle charging device shown in this embodiment, the wireless charging device reuses the first rectifier circuit and isolated converter from the wired charging device. Simultaneously, the input terminal of the first rectifier circuit is connected to the wireless charging receiver via a switching device. Thus, by controlling the switching device to turn on or off, the vehicle can be charged wirelessly or via wired connection. By reusing circuit components from the wired vehicle charging device, the design cost of the wireless charging device can be reduced. Since only the wireless charging receiver and switching device need to be added to the wired charging device, the space occupied by the charging device in the vehicle can also be reduced.

[0074] Furthermore, the wireless charging device in this embodiment achieves rectification by reusing the first rectifier circuit in the wired charging device and voltage regulation by reusing the isolated converter in the wired charging device. It can be understood that, for different battery voltage requirements, the first controller in the vehicle charging device can control the isolated converter to ensure that the voltage value output by the isolated converter meets the voltage requirements of different batteries, thus providing support for wireless charging of batteries from different vehicles.

[0075] The structure and function of the isolated converter in the vehicle charging device will be described in detail below with reference to Figures 5 and 6.

[0076] Figure 5 is a schematic diagram of an isolated converter provided in an embodiment of this application. As shown in Figure 5, the isolated converter 12 may include: a first inverter circuit 121, a transformer 122, and a second rectifier circuit 123.

[0077] The input terminal of the first inverter circuit 121 is connected to the output terminal of the first rectifier circuit 11, the output terminal of the first inverter circuit 121 is connected to the input terminal of the transformer 122, and the output terminal of the transformer 122 is connected to the input terminal of the second rectifier circuit 123.

[0078] Specifically, the first rectifier circuit 11 outputs the first DC power, the first inverter circuit 121 converts the first DC power into AC power, and after being transformed by the transformer 122, the transformed AC power is output to the second rectifier circuit 123. The second rectifier circuit 123 then converts the transformed AC power into the second DC power, thereby realizing the voltage regulation function.

[0079] In practical applications, the vehicle's first controller controls the switching frequency of the first inverter circuit in the isolated converter, so that the isolated converter converts the first DC power into the second DC power.

[0080] Specifically, the first controller adjusts the switching frequency of the first inverter in the isolated converter based on the battery voltage, and controls the on / off state of the thyristor devices in the first inverter according to this switching frequency. That is, the switching frequency is determined by the battery voltage. When the battery voltage is too high (e.g., exceeding threshold 1), the first controller increases the switching frequency to decrease the battery voltage; when the battery voltage is too low (e.g., below threshold 2), the first controller decreases the switching frequency to increase the battery voltage, thus regulating the battery charging voltage. By controlling the switching frequency of the thyristor devices in the isolated converter, the first controller can regulate the battery voltage, preventing it from becoming too low or too high.

[0081] It can be understood that the turns ratio of a transformer coil is equal to the ratio of the transformer's input voltage to its output voltage (i.e., the voltage ratio). Therefore, when the number of turns of a transformer coil is constant, the voltage ratio of the transformer is also constant.

[0082] Figure 6 is a schematic diagram of a specific structure of the vehicle charging device shown in Figure 4. As shown in Figure 6, in the vehicle charging device, the first rectifier circuit 11 is a two-phase bridge rectifier circuit, and the isolated converter 12 is a CLLC resonant converter. These two devices are reused in the wired charging device, and its specific structure can be referred to the embodiment in Figure 2, which will not be elaborated here.

[0083] In Figure 6, the switching device 22 includes a connector, a first switch K1, and a second switch K2. One end of the connector is connected to the wireless charging receiver 21, and the other end of the connector is connected to the input terminal of the first rectifier circuit 11 via the first switch K1 and the second switch K2. The connector includes a plug and a socket for connecting two active devices to transmit current or signals.

[0084] In Figure 6, the wireless charging receiver 21 includes a receiving coil and a capacitor C3. The receiving coil is mounted under the vehicle, as shown in Figure 3. The receiving coil generates a first AC value in response to changes in the magnetic field. Capacitor C3 is a resonant capacitor.

[0085] It should be noted that the first controller is not shown in Figure 6. The first controller is used to control the first switch K1 and the second switch K2 in Figure 6 to be turned on during wireless charging, or to control the first switch K1 and the second switch K2 to be turned off during wired charging. In addition, during wireless charging, the first controller is also used to control the switching frequency of multiple thyristor devices (Q5 to Q8 in Figure 6) of the CLLC resonant converter 12 to adjust the voltage value at the output terminal of the CLLC resonant converter 12 to adapt to the voltage requirements of different batteries.

[0086] Optionally, the isolated converter 12 includes any of the following: an LLC resonant converter, a CLLC resonant converter, or a phase-shifted full-bridge converter. Both the LLC and CLLC resonant converters are isolated resonant converters. The CLLC resonant converter is shown in Figure 2; compared to the CLLC resonant converter, the LLC resonant converter has one less capacitor (capacitor C1 is removed in Figure 2). The phase-shifted full-bridge converter is a DC-DC converter based on a phase-shift control strategy and belongs to the category of non-resonant converters.

[0087] Optionally, the first rectifier circuit 11 includes: a three-phase bridge rectifier circuit, or a two-phase bridge rectifier circuit.

[0088] Based on the vehicle charging device shown in Figure 4, in some embodiments, the first rectifier circuit 11 is a three-phase bridge rectifier circuit, and the isolated converter 12 can be an LLC resonant converter. In some embodiments, the first rectifier circuit 11 is a three-phase bridge rectifier circuit, and the isolated converter 12 is a phase-shifted full-bridge converter. In some embodiments, the first rectifier circuit 11 is a two-phase bridge rectifier circuit, and the isolated converter 12 is a CLLC resonant converter. In some embodiments, the first rectifier circuit 11 is a two-phase bridge rectifier circuit, and the isolated converter 12 is an LLC resonant converter. In some embodiments, the first rectifier circuit 11 is a two-phase bridge rectifier circuit, and the isolated converter 12 is a phase-shifted full-bridge converter.

[0089] The foregoing embodiments illustrate several possible configurations of wired charging devices in vehicle charging devices. This application does not limit the specific structure of the wired charging device, as long as the wired charging device includes components with rectification and voltage regulation functions, and can meet the functional requirements of wireless charging.

[0090] Based on the vehicle charging device shown in Figure 4, in some embodiments, the vehicle charging device further includes a first current detection device. Figure 7 is a structural schematic diagram of a vehicle charging device applied to a vehicle end according to an embodiment of this application. As shown in Figure 7, a first current detection device 23 is provided between the switching device 22 and the first rectifier circuit 11. The first current detection device 23 is used to detect the current value of the first AC power.

[0091] In practical applications, when the current value of the first AC current exceeds a first threshold, the vehicle's first controller controls the conduction or cutoff of the thyristor devices in the first rectifier circuit. For example, referring to Figure 6, the first current detection device 23 detects the current value of the first AC current flowing into the midpoint of the first bridge arm of the first rectifier 11 (the current direction in Figure 6 is positive). Thyristor devices Q1 and Q3 are connected in series on the first bridge arm. When the current value of the first AC current exceeds the first threshold, the first controller (not shown in the figure) controls the conduction of thyristor devices Q1 and Q4 in the first rectifier circuit 11, and controls the cutoff of thyristor devices Q2 and Q3 in the first rectifier circuit 11, thereby achieving overcurrent protection.

[0092] Optionally, the first current sensing device 23 can be a Hall effect device.

[0093] In this embodiment, the current value (i.e. the current value of the first AC current) input to the first rectifier circuit is detected by the first current detection device. When the current value is greater than the preset first threshold, the thyristor device in the first rectifier circuit can be turned off to avoid damage to the device due to excessive current, thereby realizing the overcurrent protection function.

[0094] Based on the vehicle charging device shown in Figure 4, in some embodiments, the vehicle charging device further includes a second current detection device. Referring to Figure 7, a second current detection device 24 is disposed between the isolated converter 12 and the battery. The second current detection device 24 is used to detect the current value of the battery.

[0095] Optionally, the second current sensing device 24 can be a Hall effect device.

[0096] In practical applications, when the battery current exceeds the second threshold, the vehicle's first controller shuts down the first inverter circuit in the isolated converter to prevent damage to the battery.

[0097] In this embodiment, the current value of the input battery (i.e. the charging current of the battery) is detected by a second current detection device. When the current value is greater than a preset second threshold, the first inverter circuit in the battery front-end isolated converter can be turned off, such as turning off all the thyristor devices in the first inverter circuit, to avoid the battery charging current being too large and damaging the battery, thus realizing the overcurrent protection function of the battery end.

[0098] In summary, the first wireless charging device in the vehicle charging system reuses components from existing wired charging devices, such as the cascaded first rectifier circuit and isolated converter in the wired charging device. By adding a switching device and a wireless charging receiver to the input of the first rectifier circuit, the switching state of the switching device is controlled to switch between wired and wireless charging. During wireless charging, the wireless charging receiver receives the magnetic field emitted by the transmitting coil at the charging station, generating a first alternating current. After processing by the first rectifier circuit, a first direct current is obtained. This direct current is then processed by the isolated converter to obtain a second direct current that meets the requirements of the vehicle battery, thus realizing the wireless charging function.

[0099] In the new energy vehicle market, different vehicle manufacturers may use batteries with different specifications. For example, the charging voltage (or rated voltage) of the battery in vehicle 1 is 400V, while the charging voltage of the battery in vehicle 2 is 800V. Based on the aforementioned embodiment, the vehicle battery voltage can be adjusted by controlling the switching frequency of the thyristor device in the first inverter circuit of the isolated converter to meet the battery voltage requirements of different vehicle manufacturers. The first wireless charging device can then be extended to different vehicle manufacturers.

[0100] Figure 8 is a flowchart of a charging control method provided in an embodiment of this application. The charging control method of this embodiment can be applied to a first controller in a vehicle. As shown in Figure 8, the method includes:

[0101] S110. During wireless charging, the control switch is turned on.

[0102] In some embodiments, referring to FIG6, the switching device includes a first switch and a second switch. During wireless charging, a first controller controls the first switch and the second switch to be turned on. In some embodiments, during wired charging, the first controller controls the switching device to be turned off. For example, referring to FIG6, during wired charging, the first controller controls the first switch and the second switch to be turned off.

[0103] For example, referring to Figure 15, when a communication link has been established between the vehicle and the charging station, in response to the user triggering a wireless charging operation, the vehicle sends a second request to the charging station. The second request includes relevant parameters of the vehicle-side charging device. After receiving a second response from the charging station (indicating permission for wireless charging), the vehicle's first controller controls a switching device to turn on, and the vehicle begins wireless charging.

[0104] S120. After the switching device is turned on, the switching frequency of the first inverter circuit in the isolated converter is controlled so that the isolated converter converts the first AC power into the second DC power.

[0105] The first alternating current is generated by the vehicle's wireless charging receiver in response to changes in the magnetic field, and the second direct current is the direct current input to the vehicle's battery, the voltage value of which meets the voltage requirements of the vehicle's battery.

[0106] During wireless charging, the first controller can detect the voltage value input to the vehicle battery through a voltage detection device. Based on the detected voltage value, it adjusts the switching frequency of the thyristor device in the first inverter circuit of the isolated converter in real time so that the voltage value input to the vehicle battery meets the battery's voltage requirements.

[0107] In this circuit, the switching frequency of the thyristor device in the first inverter circuit is determined based on the battery voltage. The first controller can achieve voltage regulation by either increasing the switching frequency of the thyristor device in the first inverter circuit to decrease the battery voltage or decreasing the switching frequency of the thyristor device in the first inverter circuit to increase the battery voltage.

[0108] In some embodiments, the charging control method further includes:

[0109] S130. When the current value of the first AC power is greater than the first threshold, control the first rectifier circuit to turn off.

[0110] For example, referring to Figure 7, the first controller obtains the current value of the first AC power input to the first rectifier circuit through the first current detection device. When the current value of the first AC power is greater than the first threshold, the first controller controls the thyristor device in the first rectifier circuit to turn off, so as to avoid damage to the circuit device due to excessive current, thereby realizing the overcurrent protection function.

[0111] In some embodiments, the charging control method further includes:

[0112] S140. When the current value of the battery is greater than the second threshold, the first inverter circuit in the isolated converter is turned off.

[0113] For example, referring to Figure 7, the first controller obtains the current value of the input battery through the second current detection device. When the current value of the battery is greater than the second threshold, the first controller controls all the thyristor devices in the first inverter circuit of the isolated converter to turn off, so as to avoid the battery charging current being too large and damaging the battery, thereby realizing the overcurrent protection function of the battery terminal.

[0114] The charging control method described in the above embodiments, on the one hand, detects the current value of the first AC power input to the first rectifier circuit and adjusts the conduction or cutoff of the thyristor device in the first rectifier circuit according to the magnitude of the current value to avoid damage to the circuit devices due to overcurrent. On the other hand, by detecting the current value of the battery and adjusting the conduction or cutoff of the first inverter circuit in the isolated converter according to the current value, it can prevent damage to the battery due to excessive battery charging current.

[0115] Currently, existing vehicles include electric drive controllers and / or range extender controllers. The electric drive controller is responsible for controlling the operation of the drive motor, converting the electrical energy from the vehicle battery into the electrical energy required by the drive motor based on commands such as gear selection, throttle, and braking, thus enabling functions such as acceleration, deceleration, and braking. Range extender controllers are commonly found in range-extended electric vehicles, responsible for controlling the start-up, operation, and output power of the range extender to extend the vehicle's driving range.

[0116] Since wired charging devices have relatively low power, if we want to achieve higher-power wireless charging and integrate it with the vehicle hardware, we can consider reusing the circuit components in the existing electric drive controller or range extender controller of the vehicle to realize the wireless charging function. In this way, we can not only reduce the cost of the wireless charging device, but also reduce the space occupied by the wireless charging device in the vehicle.

[0117] The following is a detailed description of another vehicle charging device provided in the embodiments of this application, with reference to Figure 9.

[0118] Figure 9 is a schematic diagram of a vehicle charging device applied to a vehicle according to an embodiment of this application. As shown in Figure 9, the vehicle charging device includes a second wireless charging device 40. The second wireless charging device 40 includes a third rectifier circuit 41, a wireless charging receiver 21, and a switching device 22. The third rectifier circuit 41 is a rectifier circuit in the vehicle's electric drive controller or range extender controller. The wireless charging receiver 21 is connected to the third rectifier circuit 41 through the switching device 22, and the output terminal of the third rectifier circuit 41 is connected to the vehicle battery.

[0119] The wireless charging receiver 21 generates a first alternating current in response to changes in the magnetic field. The third rectifier circuit 41 converts the first alternating current into a second direct current, the current value of which meets the current requirements of the vehicle battery.

[0120] In practical applications, during wireless charging, the vehicle's second controller controls the switching device to turn on; or during wired charging, the second controller controls the switching device to turn off.

[0121] In the vehicle charging device shown in this embodiment, the wireless charging device (i.e., the second wireless charging device) reuses the rectifier circuit in the vehicle's electric drive controller or range extender controller, namely the third rectifier circuit. Simultaneously, a switching device is connected to the wireless charging receiver at the input of the third rectifier circuit. Thus, during wireless charging, the vehicle's wireless charging function can be achieved by controlling the switching device to conduct. By reusing circuit components in the vehicle's electric drive controller or range extender controller, the cost of designing the vehicle wireless charging device can be reduced. Since only the wireless charging receiver and switching device need to be added to the electric drive controller or range extender controller, the space occupied by the vehicle's wireless charging device can also be reduced. The wireless charging device of this embodiment is suitable for high-power wireless charging scenarios and can achieve wireless charging power from 60kW to 120kW.

[0122] Based on the vehicle charging device shown in Figure 9, in some embodiments, the third rectifier circuit 41 is a three-phase bridge rectifier circuit. The wireless charging receiver 21 is connected to the midpoint of any two bridge arms of the third rectifier circuit 41 via a switching device 22, as shown in Figure 10.

[0123] It should be noted that three-phase bridge rectifier circuits are superior to two-phase bridge rectifier circuits in terms of electrical performance, especially in terms of rectification effect. Three-phase bridge rectifier circuits have higher rectification efficiency and more stable output. Therefore, the rectifier circuits in electric drive controllers or range extender controllers in vehicles currently usually adopt three-phase bridge rectifier circuits.

[0124] Figure 10 is a schematic diagram of a specific structure of the vehicle charging device shown in Figure 9. As shown in Figure 10, the third rectifier circuit 41 may include: inductors L1 to L3, a first bridge arm, a second bridge arm, a third bridge arm, and a capacitor C0. Two thyristors (Q1 and Q2 in Figure 10) are connected in series on the first bridge arm, two thyristors (Q3 and Q4 in Figure 10) are connected in series on the second bridge arm, and two thyristors (Q5 and Q6 in Figure 10) are connected in series on the third bridge arm. Inductors L1 and L2 are connected in series between the midpoint of the second bridge arm and the midpoint of the third bridge arm, and inductors L3 and L2 are connected in series between the midpoint of the first bridge arm and the midpoint of the second bridge arm. The capacitor C0 is connected in parallel with the three bridge arms. The thyristors may be field-effect transistors (MOSFETs) with damping diodes.

[0125] In Figure 10, the switching device 22 includes a connector, a first switch K1, and a second switch K2. One end of the connector is connected to the wireless charging receiver 21, and the other end of the connector is connected to the midpoint of the two bridge arms of the third rectifier circuit 41 via the first switch K1 and the second switch K2. For example, the first switch K1 is connected to the midpoint of the second bridge arm, and the first switch K2 is connected to the midpoint of the first bridge arm. It should be noted that the midpoint of the two bridge arms of the third rectifier circuit 41 can be regarded as the input terminal of the third rectifier circuit 41.

[0126] In Figure 10, the wireless charging receiver 21 includes a receiving coil, an inductor L4, and a capacitor C1. The inductor L4 and capacitor C1 are connected in series at one end of the receiving coil to filter harmonics and improve circuit performance.

[0127] It should be noted that the second controller is not shown in Figure 10. The second controller is used to control the first switch K1 and the second switch K2 in Figure 10 to be turned on during wireless charging, or to control the first switch K1 and the second switch K2 to be turned off during wired charging. In addition, during wireless charging, the second controller is also used to control the on or off of multiple thyristor devices (Q3 to Q6 in Figure 10) in the third rectifier circuit 41 to adjust the current value at the output of the third rectifier circuit 41 and avoid excessive charging current of the battery.

[0128] Based on the vehicle charging device shown in Figure 9, in some embodiments, the vehicle charging device further includes a third current detection device. Figure 11 is a schematic diagram of a vehicle charging device applied to a vehicle according to an embodiment of this application. As shown in Figure 11, a third current detection device 42 is provided between the switching device 22 and the third rectifier circuit 41. The third current detection device 42 is used to detect the current value of the first alternating current.

[0129] Optionally, the third current sensing device 42 can be a Hall effect device.

[0130] In practical applications, the vehicle's second controller obtains the current value of the first AC power from the third current detection device. Based on the magnitude of the first AC power current, it controls the conduction or cutoff of the thyristor devices on the two bridge arms connected to the switching device in the third rectifier circuit, so that the current value of the second DC power meets the current requirements of the vehicle battery.

[0131] In this embodiment, the current value (i.e. the current value of the first AC power) input to the third rectifier circuit is detected by the third current detection device. The second controller can control the conduction or cutoff of some thyristor devices in the third rectifier circuit according to the magnitude of the current value, thereby regulating the battery charging current and avoiding excessive battery charging current.

[0132] For example, continuing to refer to Figure 10, the third current detection device 42 is disposed between the first switch K1 and the midpoint of the second bridge arm of the third rectifier circuit 41. Based on this connection method, the second controller (not shown in Figure 10) obtains the current value of the first AC current flowing into the midpoint of the second bridge arm of the third rectifier circuit through the third current detection device 42 (the current direction shown in Figure 10 is positive). When the current value of the first AC current is greater than a third threshold, the second controller controls the thyristor devices Q3 and Q2 in the third rectifier circuit to conduct; when the current value of the first AC current is less than a fourth threshold, the second controller controls the thyristor devices Q1 and Q4 in the third rectifier circuit 41 to conduct. The third threshold is greater than the fourth threshold.

[0133] For example, the third threshold is i1, the fourth threshold is -i1, and i1 is a positive number.

[0134] For example, if the third current sensing device is placed between the second switch K2 shown in Figure 10 and the midpoint of the first bridge arm of the third rectifier circuit 41 (not shown in Figure 10), the second controller can obtain the current value of the first AC current flowing into the midpoint of the first bridge arm of the third rectifier circuit through the third current sensing device (the current direction from switch K2 to the midpoint of the first bridge arm of the third rectifier circuit in Figure 10 is positive). When the current value of the first AC current is greater than the third threshold, the second controller controls the thyristor devices Q1 and Q4 in the third rectifier circuit to conduct; when the current value of the first AC current is less than the fourth threshold, the second controller controls the thyristor devices Q3 and Q2 in the third rectifier circuit to conduct.

[0135] Based on the two examples above, the placement of the third current sensing device is different, and the control of the thyristor device in the third rectifier circuit by the second controller is different.

[0136] In some embodiments, the wireless charging receiver is connected to the midpoint of the first and second arms of the third rectifier circuit via a switching device. A first and second thyristor are connected in series on the first arm, and a third and fourth thyristor are connected in series on the second arm. The first and third thyristors share a common anode, and the second and fourth thyristors share a common cathode. A third current sensing device is used to detect the current value of the first alternating current flowing into the midpoint of the first arm.

[0137] Referring to Figure 10, the first thyristor corresponds to Q3 in Figure 10, and the third thyristor corresponds to Q1 in Figure 10, with Q1 and Q3 sharing a common anode; the second thyristor corresponds to Q4 in Figure 10, and the fourth thyristor corresponds to Q2 in Figure 10, with Q2 and Q4 sharing a common cathode. The first bridge arm corresponds to the bridge arm containing Q3 and Q4 in Figure 10, and the second bridge arm corresponds to the bridge arm containing Q1 and Q2 in Figure 10.

[0138] In practical applications, when the current value of the first AC power is greater than the third threshold, the vehicle's second controller controls the second and third thyristor devices to conduct; or, when the current value of the first AC power is less than the fourth threshold, the second controller controls the first and fourth thyristor devices to conduct.

[0139] Through the above control, on the one hand, the loss of circuit components can be reduced, and on the other hand, the current value of the second DC power output by the third rectifier circuit can be avoided to be too large, thus protecting the battery.

[0140] It should be noted that when the current value of the first AC power is between the third and fourth thresholds, the second controller does not need to perform device control. At this time, the thyristor device in the third rectifier circuit will naturally turn on or off.

[0141] In some embodiments, if a thyristor device malfunction occurs, such as when the thyristors on the first and second bridge arms are both conducting, the second controller controls all the thyristors on the first and second bridge arms (including the first, second, third, and fourth thyristors) to turn off, in order to prevent the bridge arms from being shot-through and damaging the devices.

[0142] Figure 12 is a flowchart of a charging control method provided in an embodiment of this application. The charging control method of this embodiment can be applied to a second controller in a vehicle. As shown in Figure 12, the method includes:

[0143] S210. During wireless charging, the control switch is turned on.

[0144] In some embodiments, referring to FIG10, the switching device includes a first switch and a second switch, and during wireless charging, a second controller controls the first switch and the second switch to be turned on.

[0145] In some embodiments, during wired charging, the second controller controls the switching devices to turn off. For example, referring to FIG10, during wired charging, the second controller controls the first switch and the second switch to turn off.

[0146] S220. After the switching device is turned on, the thyristor devices on the two bridge arms connected to the switching device in the third rectifier circuit are controlled to turn on or off according to the magnitude of the first AC current, so that the current value of the second DC current meets the current requirements of the vehicle battery.

[0147] The first alternating current is generated by the vehicle's wireless charging receiver in response to changes in the magnetic field.

[0148] In some embodiments, the two bridge arms connected to the switching devices in the third rectifier circuit include a first bridge arm and a second bridge arm; a first thyristor and a second thyristor are connected in series on the first bridge arm, and a third thyristor and a fourth thyristor are connected in series on the second bridge arm; the first thyristor and the third thyristor share a common anode, and the second thyristor and the fourth thyristor share a common cathode. S220 includes:

[0149] When the current value of the first AC current input to the midpoint of the first bridge arm is greater than the third threshold, the second and third thyristor devices are turned on; or, when the current value of the first AC current input to the midpoint of the first bridge arm is less than the fourth threshold, the first and fourth thyristor devices are turned on. The third threshold is greater than the fourth threshold.

[0150] The charging control method shown in the above embodiment detects the current value of the first AC power input to the third rectifier circuit, and adjusts the conduction or cutoff of the thyristor device in the third rectifier circuit according to the magnitude of the current value, thereby adjusting the current value of the battery and avoiding damage to the battery due to excessive charging current.

[0151] The foregoing embodiments illustrate two vehicle charging devices. One device enables wireless charging by reusing circuit components of the on-board charger (OBC) and allows for voltage and current regulation control, making it compatible with multiple automotive voltage platforms (e.g., 400V for low voltage and 800V for high voltage). The other device enables wireless charging by reusing circuit components of the electric drive controller or range extender controller, making it suitable for high-power wireless charging scenarios.

[0152] Since the first type of vehicle charging device can regulate the battery voltage by controlling an isolated converter, a 1-to-N integrated wireless charging solution can be designed based on this device, applicable to wireless charging of vehicles from different manufacturers. Here, N is a positive integer greater than 1.

[0153] In this regard, this application provides a vehicle charging device for use at a charging station, comprising a front-end rectifier circuit and a rear-end inverter circuit. By adding N switches to the output of the inverter circuit, each switch is connected to a transmitting coil, and the transmitting coils can be arranged in N parking spaces. Thus, by controlling the closing or opening of the N switches, wireless charging can be simultaneously achieved for different vehicles in multiple parking spaces.

[0154] It should be noted that in order to enable wireless charging for different vehicles, the vehicle can use the first type of vehicle charging device shown in Figures 4 to 7 above, and the vehicle itself can perform voltage and current regulation control.

[0155] The vehicle charging device applied to the charging pile end will be described below with reference to Figure 13.

[0156] Figure 13 is a structural schematic diagram of a vehicle charging device applied to a charging pile end according to an embodiment of this application. As shown in Figure 13, the vehicle charging device of this embodiment includes: a fourth rectifier circuit 60, a second inverter circuit 70, and N switches (K1, K2…K1 in Figure 13). N There are N transmitting coils. The input terminal of the fourth rectifier circuit 60 is connected to the power grid, and the output terminal of the fourth rectifier circuit 60 is connected to the input terminal of the second inverter circuit 70. The output terminal of the second inverter circuit 70 is connected to each of the N transmitting coils, and a switch is provided between each transmitting coil and the second inverter circuit 70.

[0157] The fourth rectifier circuit 60 is used to convert the second AC power from the power grid into the third DC power; the second inverter circuit 70 is used to convert the third DC power into the third AC power; and the transmitting coil is used to generate a magnetic field change based on the third AC power.

[0158] Optionally, the fourth rectifier circuit 60 can be a three-phase bridge rectifier circuit or a two-phase bridge rectifier circuit.

[0159] Optionally, all N transmitting coils have the same number of turns.

[0160] In practical applications, the third controller at the charging station controls the switch corresponding to the target transmitting coil to be turned on based on the target vehicle's location. The target vehicle is the vehicle undergoing wireless charging, and the target transmitting coil is the transmitting coil corresponding to the target vehicle's location.

[0161] The vehicle charging device shown in this embodiment reuses a single rectifier and inverter circuit for multiple parking spaces, which reduces the cost of the vehicle charging device at the charging station. When multiple vehicles in multiple parking spaces require wireless charging, multiple corresponding switches can be turned on to generate magnetic field changes in the corresponding transmitting coils, enabling simultaneous wireless charging for multiple vehicles.

[0162] Correspondingly, vehicles in different parking spaces can adjust the battery voltage or current by controlling the switching frequency of the thyristor devices on the isolated converter in the vehicle charging device, so as to meet the charging needs of different vehicle batteries.

[0163] Based on the vehicle charging device shown in Figure 13, this application embodiment provides a charging control method that can be applied to a third controller at the charging pile end. The method includes: controlling the switch corresponding to the target transmitting coil to be turned on according to the target vehicle position.

[0164] The target vehicle is the vehicle undergoing wireless charging, and the target transmitting coil is the transmitting coil corresponding to the location of the target vehicle.

[0165] In some embodiments, after the target vehicle establishes a connection with the pile, the target vehicle sends its location to the pile, so that the third controller at the pile controls the switch of the transmitting coil corresponding to the target vehicle location to be turned on based on the target vehicle location. See Figure 15 for a detailed embodiment of the process.

[0166] The charging control method shown in the above embodiments can enable simultaneous wireless charging of multiple vehicles.

[0167] Figure 14 is a schematic diagram of a vehicle wireless charging scenario provided by an embodiment of this application. As shown in Figure 14, the scenario includes a charging pile and N parking spaces. The charging pile includes a fourth rectifier circuit 60, a second inverter circuit 70, a third controller 80, and N switches. A transmitting coil is set on the ground in each parking space, and each transmitting coil is connected to one of the switches in the charging pile.

[0168] In one possible scenario, as shown in Figure 14, vehicle 1 and vehicle 2 are parked in two parking spaces respectively, and both vehicle 1 and vehicle 2 need wireless charging. At this time, the third controller 80 controls the K1 switch corresponding to the transmitting coil 1 and the K2 switch corresponding to the transmitting coil 2 to be turned on, so that the transmitting coil 1 and the transmitting coil 2 generate magnetic field changes respectively, so as to achieve wireless charging for both vehicles at the same time.

[0169] Correspondingly, the receiving coil in the charging device of vehicle 1 generates alternating current in response to changes in the magnetic field. This current is rectified by the rectifier circuit at the rear of the receiving coil and then regulated by an isolated converter to charge the vehicle battery (or power the high-voltage components of the vehicle). The charging device of vehicle 2 can be referenced from that of vehicle 1.

[0170] In this embodiment, the charging devices for vehicle 1 and vehicle 2 are the vehicle charging devices shown in Figures 4 to 7 above.

[0171] The communication interaction process between the vehicle 1 and the charging pile will be described below with reference to Figure 15.

[0172] Figure 14 is a schematic diagram of the interaction of wireless charging for a vehicle according to an embodiment of this application. As shown in Figure 15, the interaction process of wireless charging for a vehicle includes:

[0173] S310. After vehicle 1 is parked in parking space 1, in response to the connection operation triggered by the user, a first request is sent to the charging pile. The first request is used to request the establishment of a communication link with the charging pile.

[0174] For example, vehicle 1 can establish a communication link with the charging pile through near-field communication methods such as Bluetooth, Wi-Fi (Wireless Fidelity), or Near Link.

[0175] S320. In response to the first request, the charging pile sends a first response to vehicle 1, the first response indicating that a communication link has been established.

[0176] S330. In response to a user-triggered wireless charging operation, vehicle 1 sends a second request to the charging station, the second request including relevant parameters of the charging device of vehicle 1.

[0177] For example, in response to a wireless charging operation triggered by a user on the display screen of vehicle 1, or in response to a wireless charging operation input by a user's voice, or in response to a user's air gesture operation within the range of the vehicle's camera (e.g., an air gesture of spreading five fingers to trigger the vehicle's wireless charging function), vehicle 1 sends a second request to the charging station.

[0178] The relevant parameters of the charging device of vehicle 1 include, but are not limited to: the charging parameters of the vehicle battery (such as voltage, current or power parameters), and the type of wireless charging device of the vehicle. For example, the wireless charging device of vehicle 1 adopts the wireless charging device shown in Figures 4 to 7.

[0179] S340. Based on the second request, the charging station confirms whether the charging device of vehicle 1 is compatible with the charging station.

[0180] In some examples, the charging station determines whether it matches the wireless charging device of vehicle 1 in the second request. If the wireless charging device of vehicle 1 is of a preset type (as shown in Figures 4 to 7), then the charging device of vehicle 1 is determined to match the charging station; if the wireless charging device of vehicle 1 is not of a preset type (as shown in Figures 9 to 11), then the charging device of vehicle 1 is determined to not match the charging station.

[0181] If the charging device of vehicle 1 is compatible with the charging station, then execute:

[0182] S350a. The charging station sends a second response to vehicle 1, which indicates that vehicle 1 is permitted to perform wireless charging.

[0183] For example, based on the second response, vehicle 1 may pop up a window on its display screen displaying "Allow vehicle wireless charging", or vehicle 1 may announce "Allow vehicle wireless charging" through its speaker.

[0184] If the charging device of vehicle 1 is not compatible with the charging station, then execute:

[0185] S350b. The charging station sends a third response to vehicle 1, which indicates that vehicle 1 is not allowed to wirelessly charge.

[0186] For example, based on a third response, vehicle 1 may display a pop-up window on its screen that says "Wireless charging is not allowed," or vehicle 1 may announce "Wireless charging is not allowed" through its speaker.

[0187] Following S350a, the following is also executed:

[0188] S360. Vehicle 1 sends vehicle location information to the charging station.

[0189] After obtaining its location information through the onboard positioning system, vehicle 1 sends the vehicle location information to the charging station. The vehicle location information may include, for example, the vehicle's latitude and longitude.

[0190] S370. Based on the vehicle location information, the charging pile controls the switch corresponding to the transmitting coil at the location of vehicle 1 to be turned on.

[0191] After the switch corresponding to the transmitting coil at the location of vehicle 1 is turned on, the charging pile can wirelessly charge vehicle 1. The charging principle can be referred to the embodiment shown in Figure 14, which will not be repeated here.

[0192] When other vehicles in parking spaces need wireless charging, the above interaction process can be reused to communicate with the charging pile and trigger the charging pile to wirelessly charge the vehicle in that parking space.

[0193] This application provides a vehicle, including: a vehicle charging device as shown in any of the foregoing embodiments.

[0194] This application provides a charging control device, including a memory and a processor; the processor is coupled to the memory, reads and executes instructions in the memory to implement the steps of the charging control method in the above method embodiment. Its implementation principle and technical effect are similar to those of the above related embodiments, and will not be repeated here.

[0195] This application also provides a computer-readable storage medium storing computer instructions. When the computer instructions are executed, they implement the steps of the charging control method in the above method embodiments. The implementation principle and technical effects are similar to those in the above related embodiments, and will not be repeated here.

[0196] This application also provides a computer program product, which includes a computer program. When the computer program is executed, it implements the steps of the charging control method in the above method embodiments. Its implementation principle and technical effects are similar to those in the above related embodiments, and will not be repeated here.

[0197] This application provides a chip. The chip includes a processor, which calls a computer program in memory to execute the steps of the charging control method in the above-described method embodiments. Its implementation principle and technical effects are similar to those in the related embodiments described above, and will not be repeated here.

[0198] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., a solid-state disk (SSD)).

[0199] The term "multiple" in this document refers to two or more. The term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the preceding and following related objects; in formulas, " / " indicates a "division" relationship. Additionally, it should be understood that in the description of this application, words such as "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or order.

[0200] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application. It is also understood that in the embodiments of this application, the sequence number of each process does not imply the order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

Claims

1. A vehicle charging device, characterized in that, include: A first wireless charging device; the first wireless charging device includes a first rectifier circuit, an isolated converter, a wireless charging receiver, and a switching device; The first rectifier circuit and the isolated converter are circuit components of the wired charging device in the vehicle; The wireless charging receiver is connected to the input terminal of the first rectifier circuit via the switching device, the input terminal of the isolated converter is connected to the output terminal of the first rectifier circuit, and the output terminal of the isolated converter is connected to the vehicle battery. The wireless charging receiver is used to generate a first alternating current in response to changes in the magnetic field; The first rectifier circuit is used to convert the first alternating current into the first direct current; The isolated converter is used to convert the first DC power into a second DC power, the voltage value of which meets the voltage requirements of the battery.

2. The apparatus according to claim 1, characterized in that, The isolated converter includes any one of the following: LLC resonant converter, or CLLC resonant converter, or phase-shifted full-bridge converter.

3. The apparatus according to claim 1, characterized in that, The isolated converter includes: a first inverter circuit, a transformer, and a second rectifier circuit; The input terminal of the first inverter circuit is connected to the output terminal of the first rectifier circuit, the output terminal of the first inverter circuit is connected to the input terminal of the transformer, and the output terminal of the transformer is connected to the input terminal of the second rectifier circuit.

4. The apparatus according to any one of claims 1 to 3, characterized in that, The vehicle charging device further includes: a first current detection device, which is disposed between the switching device and the first rectifier circuit, and the first current detection device is used to detect the current value of the first AC power.

5. The apparatus according to any one of claims 1 to 3, characterized in that, The vehicle charging device further includes a second current detection device, which is disposed between the isolated converter and the battery, and is used to detect the current value of the battery.

6. The apparatus according to claim 1, characterized in that, The first rectifier circuit includes: a three-phase bridge rectifier circuit, or a two-phase bridge rectifier circuit.

7. The apparatus according to claim 1, characterized in that, The switching device includes: a connector, a first switch, and a second switch; one end of the connector is connected to the wireless charging receiver, and the other end of the connector is connected to the input terminal of the first rectifier circuit through the first switch and the second switch; During wireless charging, the first switch and the second switch are turned on; When charging via wire, the first switch and the second switch are turned off.

8. A vehicle, characterized in that, include: The vehicle charging device as described in any one of claims 1 to 7.

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