Non-vehicle charger, charging system and charging station

Abstract

The present application provides a non-on-board charger, a charging system and a charging station. The non-on-board charger includes a power conversion circuit, a power supply port, an adapter and a controller; the adapter includes a connection port and an AC output port. When the adapter is connected to the power supply port, the controller controls the power supply port to be connected to the AC power grid, the power supply port to be connected to the connection port, and the AC output port to be connected to the charging port of the powered device; when the adapter is disconnected from the power supply port, the controller controls the power conversion circuit to be connected to the AC power grid, and the power supply port to be connected to the charging port of the powered device. By using the non-on-board charger provided by the present application, the non-on-board charger can realize both AC charging and DC charging functions, and eliminates the use of charging gun cables, saving costs.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle charging, and in particular to a non-vehicle charger, a charging system and a charging station. Background Art

[0002] For pure electric vehicles, there are generally two different types of charging interfaces, namely: AC charging interface and DC charging interface. The AC charging interface corresponds to the AC charging device, and the DC charging interface corresponds to the DC charging device. For plug-in hybrid vehicles, there is only one AC charging interface and can only be charged using an AC charging device. Among them, plug-in hybrid vehicles refer to hybrid vehicles that can use an external power supply to charge the vehicle's power battery. Plug-in hybrid vehicles have two power systems, namely the engine and the electric motor. These two power systems can not only work independently of each other, but also work together to drive the car forward.

[0003] Most electric vehicle charging sites are DC charging equipment, which will face the problem of plug-in hybrid vehicles being unable to charge. When there is no suitable charging site for charging, plug-in hybrid vehicles will switch to the engine power system more often, increasing carbon emissions. In addition, with the large-scale implementation and promotion of low-power DC charging equipment, more and more low-power DC charging equipment is deployed in electric vehicle charging sites, and the charging difficulty of the remaining plug-in hybrid vehicles is gradually increasing.

[0004] At present, there is a charging pile design scheme that integrates AC charging equipment and DC charging equipment, that is, on one charging pile, two sets of charging circuits are designed: a DC charging circuit and an AC charging circuit, and a DC charging gun (connected to the DC charging circuit) and an AC charging gun (connected to the AC charging circuit) are set at the same time. Users can choose to insert the DC charging gun / AC charging gun from the device into the charging interface according to the actual needs of the electric vehicle to meet the charging needs. However, in the above scheme, two charging guns and more charging cables need to be set up at the same time, or the AC charging interface of the plug-in hybrid vehicle can be modified, and the AC charging interface can be converted into a DC charging interface, so that the DC charging equipment can be used directly for charging, but the above scheme requires the electrical system of the electric vehicle to be modified, and the existing models that have been produced and shipped cannot be modified, and cannot be compatible with all models on the market.

[0005] In view of this, it is necessary to propose a solution for charging a plug-in hybrid electric vehicle, so as to provide charging services for the plug-in hybrid electric vehicle using a DC charging interface. Summary of the invention

[0006] The present application provides an off-board charger, a charging system and a charging station, so as to provide charging services for plug-in hybrid electric vehicles using a DC charging interface.

[0007] In a first aspect, the present application provides a non-on-board charger, which includes: a power conversion circuit, a power supply port, an adapter and a controller; the adapter includes a connection port and an AC output port, the connection port is configured to be connected to the power supply port, the AC output port is configured to be connected to the charging port of a powered device, and the AC output port is configured to be connected to the charging port of the powered device; the controller is used to: when the adapter is connected to the power supply port, control the power supply port to be connected to the AC power grid, the power supply port to be connected to the connection port, and the AC output port to be connected to the charging port of the powered device; when the adapter is disconnected from the power supply port, control the input end of the power conversion circuit to be connected to the AC power grid, and the power supply port to be connected to the charging port of the powered device.

[0008] The off-board charger provided in the present application can provide DC charging services for pure electric vehicles, and can also provide AC charging services for plug-in hybrid electric vehicles. In addition, due to the newly added conversion head design, an off-board charger can be compatible with both AC charging and DC charging functions, and the use of charging gun cables is eliminated, saving costs. When the power supply port is connected to the conversion head, the power supply port connected to the conversion head can provide AC charging services, and when the power supply port is disconnected from the conversion head, the power supply port of the off-board charger can provide AC charging services.

[0009] As a possible implementation, the off-board charger also includes a connection confirmation port; the controller is specifically used to control the power supply port to be connected to the AC power grid, the power supply port to be connected to the connection port, and the AC output port to be connected to the charging port of the powered device when the voltage of the connection confirmation port is a first voltage; when the voltage of the connection confirmation port is a second voltage, the input end of the power conversion circuit is controlled to be connected to the AC power grid, and the power supply port to be connected to the charging port of the powered device. When the controller detects that the voltage of the connection confirmation port becomes the first voltage, the AC power grid is selectively directly connected to the power supply port, so that the AC power provided by the AC power grid is directly provided to the powered device through the power supply port. After detecting that the voltage of the connection confirmation port becomes the second voltage, the controller selectively connects the AC power grid to the input end of the power conversion circuit, so that the AC power provided by the AC power grid is converted into DC power through the power conversion circuit, and the DC power is provided to the powered device through the power supply port.

[0010] In order to enable the off-board charger to complete handshake communication with the powered device, as a possible implementation method, the adapter also includes an identification resistance circuit, which is used to adjust the identification resistance size of the AC output port; the controller is also used to control the identification resistance circuit to adjust the identification resistance size of the AC output port when the adapter is connected to the power supply port, so that the identification resistance of the AC output port is the target resistance, so that the off-board charger and the powered device complete handshake communication.

[0011] As a possible implementation, the connection confirmation port specifically includes: a first charging connection port and a second charging connection port; the connection port specifically includes: a first power port and a third charging connection port; the AC output port specifically includes: a second power port, a fourth charging connection port and a charging control confirmation port; the power supply port, the first power port and the second power port are configured to be connected in series, and the first charging connection port, the third charging connection port and the charging control confirmation port are configured to be connected in series. The controller is specifically used to control the power supply port to be connected to the AC power grid, the power supply port to be connected to the connection port, and the AC output interface to be connected to the charging port of the powered device when the voltage of the first charging connection port is a first voltage; when the voltage of the first charging connection port is a second voltage, control the input end of the power conversion circuit to be connected to the AC power grid, the power supply port to be connected to the charging port of the powered device, and transmit the charging communication signal between the non-vehicle charger and the powered device through the second charging connection port.

[0012] Among them, the connection confirmation port specifically includes a first charging connection port and a second charging connection port. The first charging connection port can be used as a detection point for the controller to perform voltage detection, and can also be used as a CC1 port for DC charging communication handshake. The second charging connection port can be used as a CC2 port for DC charging communication handshake.

[0013] As a possible implementation, the off-board charger also includes: a first ground port, a first resistor and a first switch, the connection port also includes: a second ground port, and the AC output port also includes: a third ground port; the first ground port, the second ground port and the third ground port are configured to be connected in series, and the first ground port is connected in series with the first charging connection port through the first resistor and the first switch; when the power supply port is connected to the adapter, the first switch is triggered to close so that the voltage of the first charging connection port becomes the first voltage; when the power supply port is disconnected from the adapter, the first switch is triggered to open so that the voltage of the first charging connection port becomes the second voltage.

[0014] The first grounding port, the second grounding port and the third grounding port are configured to be connected in series, and can be used as a protective grounding port to pass through the connection between the power supply port and the adapter. When the first switch is closed, the first resistor is connected to the circuit, so that the voltage division size of the first charging connection port changes, and the charging mode of the powered device is determined according to the different voltage values ​​of the first charging connection port.

[0015] As a possible implementation manner, the off-board charger further includes: a second resistor, and the first grounding port and the second charging connection port are connected via the second resistor.

[0016] As a possible implementation, one end of the identification resistor circuit is connected to the third ground port, and the other end of the identification resistor circuit is connected to the fourth charging connection port. The identification resistor circuit in the adapter makes the identification resistor output by the AC output port meet the CC resistance value specified by the national standard impedance, thereby completing the communication handshake.

[0017] As a possible implementation manner, when the first charging connection port, the third charging connection port and the charging control confirmation port are configured to be connected in series, they are suitable for transmitting charging communication signals between the off-board charger and the powered device.

[0018] As a possible implementation mode, the power supply port includes a positive power port and a negative power port, and the AC power grid is connected to the input end of the power conversion circuit through a first-phase AC power port, a second-phase AC power port, and a third-phase AC power port, or the AC power grid is connected to the positive power port through any one of the first-phase AC power port, the second-phase AC power port, and the third-phase AC power port, and the negative power port is connected to the three-phase input neutral line of the AC power grid.

[0019] As a possible implementation, the off-board charger further includes: a second switch group and a third switch group; the AC power grid is connected to the power supply port through the second switch group, and the AC power grid is connected to the third switch group through the power conversion circuit; when the second switch group is closed, the third switch group is disconnected, and when the second switch group is disconnected, the third switch group is closed. The closing relationship of the switch groups on both sides of the power conversion circuit is also mutually exclusive. When it is determined that the powered device is in the AC charging mode, the identification resistance of the AC output port is adjusted to the target resistance, the AC power grid is controlled to be connected to the power supply port through the second switch group, and the power supply port is connected to the charging port of the powered device through the adapter; and when the powered device is in the DC charging mode, the AC power grid is controlled to be connected to the input end of the power conversion circuit through the third switch group, and the power supply port is connected to the charging port of the powered device.

[0020] As a possible implementation, the controller is also used to: when the adapter is connected to the power supply port, output a first communication signal to the connection confirmation port; when the adapter is disconnected from the power supply port, output a second communication signal to the connection confirmation port. The controller can realize the control guidance function and can realize the DC / AC handshake communication requirements of all electric vehicles that meet the national standards. When it is determined that the powered device is in AC charging mode, the CP signal required for AC charging mode communication is a PWM signal, and the first communication signal is output to the connection confirmation port. When the powered device is in DC charging mode, the CC1 signal required for DC charging mode communication is a step signal, and the second communication signal is output to the connection confirmation port.

[0021] As a possible implementation, the off-board charger also includes: an auxiliary power supply, an auxiliary source positive port, and an auxiliary source negative port. The output positive terminal of the auxiliary power supply is connected to one end of the auxiliary source positive port, and the output negative terminal of the auxiliary power supply is connected to one end of the auxiliary source negative port. When the power supply port is connected to the adapter, the other end of the auxiliary source positive port and the other end of the auxiliary source negative port are in an idle state. In actual applications, a DC off-board charger has two more ports than an AC off-board charger, namely, an auxiliary source positive port and an auxiliary source negative port. There is no actual signal or current transmission between the two ports and the powered device, so these two ports are set to an idle state and do not need to be connected to the powered device.

[0022] As a possible implementation, the power conversion circuit includes: an AC-to-DC circuit and a DC-to-DC circuit; the input end and the power supply port of the AC-to-DC circuit are used to connect to the AC power grid, the output end of the AC-to-DC circuit is connected to the input end of the DC-to-DC circuit, and the output end of the DC-to-DC circuit is connected to the power supply port. The AC-to-DC circuit is used to convert the AC power provided by the AC power grid into DC power, and the AC-to-DC circuit is used to adjust the DC voltage output by the AC-to-DC circuit to meet the charging requirements of the powered device.

[0023] In a second aspect, the present application provides a charging system, which includes a charging pile and a powered device, wherein the charging pile includes a non-vehicle-mounted charger as in the first aspect; the charging pile is used to charge the powered device.

[0024] In a third aspect, the present application provides a charging station, which includes at least one charging pile, each charging pile includes the non-on-board charger of the first aspect; the charging pile is used to charge a powered device connected thereto.

[0025] For the description of the technical effects that can be achieved from the second to the third aspects mentioned above, please refer to the description of the technical effects that can be achieved by any possible design in the first aspect mentioned above, and the repetitions will not be discussed here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of an electric vehicle charging scenario;

[0027] Figure 2A A schematic diagram of the structure of a non-vehicle charger Figure 1 ;

[0028] Figure 2B A schematic diagram of the structure of a non-vehicle charger including an identification resistor circuit;

[0029] Figure 3 The second structural diagram of a non-vehicle charger;

[0030] Figure 4 A schematic diagram of the structure of a non-vehicle charger Figure 3 ;

[0031] Figure 5 A schematic diagram of the structure of a non-vehicle charger Figure 4 ;

[0032] Figure 6 A connection diagram of an identification resistor circuit in a non-vehicle charger;

[0033] Figure 7 A schematic diagram of the structure of a non-vehicle charger Figure 5 ;

[0034] Figure 8 A schematic diagram of the structure of a non-vehicle charger Figure 6 ;

[0035] Fig. 9 A schematic diagram of the structure of a non-vehicle charger Figure 7 ;

[0036] Fig.10 A schematic diagram of the structure of a non-vehicle charger Figure 8 ;

[0037] Fig.11 The present invention is a flow chart of the charging control strategy steps of a non-vehicle charger. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as being limited to the embodiments described herein; on the contrary, these embodiments are provided to make the present application more comprehensive and complete, and to fully convey the concepts of the example embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and thus their repeated descriptions will be omitted. The words expressing position and direction described in this application are all explained using the accompanying drawings as examples, but changes may be made as needed, and all changes are included in the scope of protection of this application. The drawings of this application are only used to illustrate the relative position relationship and do not represent the true proportions.

[0039] First, some of the terms involved in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

[0040] (1) Connection confirmation (CC) signal: It is a functional signal that indicates the status of the vehicle plug connected to the electric vehicle and / or the power plug connected to the charging device by electronic or mechanical means. The port used to transmit the CC signal is the CC port. Based on the provisions of the "Electric Vehicle Conduction Power Supply System Standard", for AC-charged electric vehicles, the battery management system in the electric vehicle determines the power supply capacity of the charging pile and the type of charging cable connecting the charging pile and the battery management system by comparing the resistance value between the CC port and the battery management system. For DC-charged electric vehicles, the port for transmitting the CC signal is the CC port, which is further divided into two, namely, the CC1 port and the CC2 port. The CC1 signal is the connection confirmation signal on the charging pile side, and the CC2 signal is the connection confirmation signal on the vehicle side.

[0041] (2) Control pilot (CP) signal: It is a communication signal between the electric vehicle and the electric vehicle power supply equipment used to achieve interaction and monitoring during AC charging.

[0042] (3) Battery management system (BMS): It is a control system that protects the safe use of power batteries in electric vehicles. It monitors the use status of power batteries and alleviates the inconsistency of power batteries through necessary measures, thus providing safety protection for the use of power batteries.

[0043] Plug-in hybrid electric vehicles are hybrid electric vehicles that can use an external power source to charge the vehicle's power battery. Plug-in hybrid electric vehicles have two power systems: Figure 1 Only the schematic diagram of the scene using the power battery to drive the car forward is shown, see Figure 1As shown, the electric car 10 mainly includes: a battery management system 11, a power battery 12, a motor 13 and wheels 14.

[0044] Among them, the power battery 12 can be a large-capacity, high-power storage battery. The power battery 12 can provide electrical energy to some or all components of the electric vehicle 10. In some examples, the power battery 12 can be composed of one or more rechargeable lithium-ion or lead-acid batteries. In addition, the power battery 12 can also use other power supply materials and configurations, which are not limited here. When the electric vehicle 10 is running, the power battery 12 can power the motor 13 through the motor controller (motor control unit, MCU) in the battery management system 11, and the motor 13 converts the electrical energy provided by the power battery 12 into mechanical energy, thereby driving the wheels 14 to rotate, thereby realizing the driving of the electric vehicle 10.

[0045] When the electric vehicle 10 is charged, the power battery 12 of the electric vehicle 10 can generally be charged through the charging pile 20. Figure 1 As shown, the charging pile 20 mainly includes a power supply circuit ( Figure 1 The power supply circuit is connected to the power grid 30 at one end, and the other end is connected to the charging gun 21 through a cable. The operator can insert the charging gun 21 into the charging socket of the electric vehicle 10 to connect the charging gun 21 to the battery management system 11 in the electric vehicle 10, and the power supply circuit of the charging pile 20 can then charge the power battery 12 through the charging gun 21.

[0046] Pure electric vehicles generally have two charging ports (AC charging port and DC charging port). The AC charging port can be connected to an AC charging device (AC charging socket), and the DC charging port can be connected to a DC charging device (DC charging socket). Plug-in hybrid vehicles only have one AC charging port, so they can only be charged using an AC charging device. Most electric vehicle charging sites are equipped with DC charging devices, which will cause plug-in hybrid vehicles to be unable to charge.

[0047] In view of this, the present application provides an off-board charger and a charging system to provide charging services for plug-in hybrid electric vehicles using a DC charging interface.

[0048] See also Figure 2A As shown, Figure 2A A schematic diagram of the structure of a non-vehicle charger Figure 1, the off-board charger 200 includes: a power conversion circuit 201, a power supply port 202, an adapter 203 and a controller 204. The present application uses a newly added adapter 203 to enable a charger to simultaneously realize both AC charging and DC charging functions, and eliminates the AC charging gun cable, saving costs. Among them, the off-board charger 200 can be arranged in the charging pile 20 in the above embodiment, and the power supply port 202 can be regarded as the output interface of the charging gun 21 in the above embodiment. When the adapter 203 is used to connect to the power supply port 202, it can be connected through a hardware structure, that is, directly connected in the form of a snap, and can also be connected by installing a cable. The connection method between the adapter 203 and the power supply port 202 can be but not limited to the above-mentioned methods, and the specific connection method is not limited here.

[0049] The output end of the power conversion circuit 201 is connected to the power supply port 202. The power supply port 202 is specifically configured as a DC output positive end (DC+) and a DC output negative end (DC-). The DC power outputted by the power supply port 202 is respectively inputted to the powered device 206 via the DC output positive end (DC+) and the DC output negative end (DC-). The DC output positive end (DC+) is used as the positive electrode, and the DC output negative end (DC-) is used as the negative electrode. The potential of the positive electrode is high, while the potential of the negative electrode is low. When the two electrodes are connected to the circuit, a constant potential difference can be maintained between the two ends of the circuit, thereby forming a current from the positive electrode to the negative electrode in the circuit to stably charge the powered device 206.

[0050] In addition, the power supply port 202 may also include a protective earthing port (PE), etc. The protective earthing port may be used as a grounding lead of the device.

[0051] The AC power grid 205 can be selectively connected to the input end of the power conversion circuit 201 or the power supply port 202, so that when the power supply port 202 is directly connected to the powered device 206 in the DC charging mode, the AC power grid 205 is selectively connected to the input end of the power conversion circuit 201, so that the AC power provided by the AC power grid 205 is converted into DC power through the power conversion circuit 201, and provided to the powered device 206 through the power supply port 202. When the power supply port 202 is connected to the powered device 206 in the AC charging mode through the adapter 203, the AC power grid 205 is selectively directly connected to the power supply port 202, so that the AC power provided by the AC power grid 205 is directly provided to the powered device 206 through the power supply port 202.

[0052] The connection relationship between the AC power grid 205 and the input end or the power supply port 202 of the power conversion circuit 201 can be determined by whether the adapter 203 is connected to the power supply port 202. When the adapter 203 is connected to the power supply port 202, the power supply port 202 is controlled to be connected to the AC power grid 205, and the power supply port 202 is connected to the charging port of the powered device 206 through the adapter 203; when the adapter 203 is disconnected from the power supply port 202, the input end of the power conversion circuit 201 is controlled to be connected to the AC power grid 205, and the power supply port 202 is connected to the charging port of the powered device 206.

[0053] As a possible implementation, the off-board charger 200 also includes a connection confirmation port 2022; the controller 204 is specifically used to: when the voltage of the connection confirmation port 2022 is a first voltage, control the power supply port 202 to be connected to the AC power grid 205, the power supply port 202 to be connected to the connection port 2031, and the AC output port 2032 to be connected to the charging port of the powered device 206; when the voltage of the connection confirmation port 2022 is a second voltage, control the input end of the power conversion circuit 201 to be connected to the AC power grid 205, and the power supply port 202 to be connected to the charging port of the powered device 206.

[0054] The controller 204 determines the connection relationship between the input end or the power supply port 202 of the power conversion circuit 201 and the AC power grid 205, and can also be determined by the voltage of the connection confirmation port 2022 of the power supply port 202. The connection confirmation port 2022 can be connected to the auxiliary power supply inside the off-board charger 200, and its voltage value is switched through the internal voltage divider circuit. When the adapter 203 is connected to the power supply port 202, the voltage divider circuit can adjust the voltage of the connection confirmation port 2022 to a first voltage, and when the adapter 203 is disconnected from the power supply port 202, the voltage divider circuit adjusts the voltage of the connection confirmation port 2022 to a second voltage.

[0055] When the power supply port 202 is connected to the adapter 203, the voltage of the connection confirmation port 2022 becomes a first voltage. When the controller 204 detects that the voltage of the connection confirmation port 2022 becomes the first voltage, the AC power grid 205 is selectively directly connected to the power supply port 202, so that the AC power provided by the AC power grid 205 is directly provided to the powered device 206 through the power supply port 202. When the power supply port 202 is disconnected from the adapter 203, the voltage of the connection confirmation port 2022 becomes a second voltage. After detecting that the voltage of the connection confirmation port becomes the second voltage, the controller 204 selectively connects the AC power grid 205 to the input end of the power conversion circuit 201, so that the AC power provided by the AC power grid 205 is converted into DC power through the power conversion circuit 201 and provided to the powered device 206 through the power supply port 202.

[0056] The controller 204 can be a general-purpose central processing unit (CPU), a general-purpose processor, a digital signal processing (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The above-mentioned processor can also be a combination that realizes the computing function. For example, the controller 204 can include one or more microprocessor combinations, a combination of DSP and microprocessor, etc. The controller 204 can also include an analog to digital converter (ADC) for obtaining the voltage of the connection confirmation port 2022.

[0057] The adapter 203 includes a connection port 2031 and an AC output port 2032, wherein the connection port 2031 is configured to be connected to the power supply port 202, and the AC output port 2032 is configured to be connected to the charging port of the powered device 206. It should be noted that the adapter 203 of the embodiment does not have a DC to AC conversion function, and only needs to connect the power supply port 202 and the powered device 206.

[0058] In order to enable the off-board charger 200 to complete the handshake communication with the powered device 206, as a possible implementation method, refer to Figure 2B As shown, Figure 2B The present invention is a structural diagram of an off-board charger including an identification resistance circuit, wherein the adapter 203 also includes: an identification resistance circuit 2033, wherein the identification resistance circuit 2033 is used to adjust the identification resistance of the AC output port 2032; and a controller 204, which is further used to control the identification resistance circuit 2033 to adjust the identification resistance of the AC output port 2032 when the adapter 203 is connected to the power supply port 202, so that the identification resistance of the AC output port 2032 is the target resistance, so that the off-board charger 200 completes handshake communication with the powered device 206.

[0059] Since most of the charging equipment configured in electric vehicle charging places are DC charging equipment, this application is used to transform the power supply port 202 of the DC charging equipment into an interface that can be connected and communicated with an AC charging socket through an adapter 203. And based on explanation (1), when the DC charging scene and the AC charging scene perform a communication handshake, the interface and internal circuit structure corresponding to the connection confirmation signal are not the same (the AC charging scene communication requires the CC port and the CP port, and the DC charging scene communication requires the CC1 port and the CC2 port). Therefore, this application can reconfigure the interface of the power supply port 202 through the adapter 203, so as to provide charging services for plug-in hybrid electric vehicles using an AC / DC charging interface.

[0060] Take the connection between the adapter 203 and the power supply port 202 (the powered device 206 is in AC charging mode) as an example. If you want to use the non-vehicle charger 200 to charge the powered device 206, the interface between the power supply port 202 and the AC charging socket of the powered device 206 has a signal transmission port in addition to the AC connection: a CC signal port for transmitting CC signals, and a CC signal port for transmitting CP signals. Among them, the CC signal port and the AC charging interface of the powered device 206 are purely resistive, and the CP signal is a PWM signal. The different duty cycles of the PWM signal are used to transmit different communication contents.

[0061] However, the charging interface that originally provides charging services for DC power receiving devices does not have the above-mentioned CC signal port for transmitting CC signals. Therefore, the present application adds an adapter 203, and through the identification resistor circuit 2033 in the adapter 203, the identification resistor output by the AC output port 2032 meets the CC resistance value specified in the "Electric Vehicle Conduction Power Supply System Standard", thereby completing the communication handshake.

[0062] The powered device 206 may include a battery management system that determines the power supply capacity of the off-board charger 200 and the charging type between the off-board charger 200 and the battery management system by comparing the resistance value between the CC signal identification port and the battery management system; at the same time, the off-board charger 200 also determines the output power of the off-board charger 200 by the duty cycle of the CP signal. After the battery management system completes the relevant charging configuration according to the power supply capacity and output power of the off-board charger 200, the battery management system controls the on-board charger (OBC) inside the powered device 206 to receive the power provided by the off-board charger 200, thereby charging the power battery.

[0063] As a possible implementation, see Figure 3 As shown, Figure 3Schematic diagram 2 of a non-vehicle charger; the connection confirmation port 2022 specifically includes: a first charging connection port 20221 and a second charging connection port 20222; the connection port 2031 specifically includes: a first power port 20311 and a third charging connection port 20312; the AC output port 2032 specifically includes: a second power port 20321, a fourth charging connection port 20322 and a charging control confirmation port 20323; the power supply port 202, the first power port 20311 and the second power port 20321 are configured to be connected in series, and the first charging connection port 20221, the third charging connection port 20312 and the charging control confirmation port 20323 are configured to be connected in series;

[0064] The controller 204 is specifically used to control the power supply port 202 to be connected to the AC power grid 205, the power supply port 202 to be connected to the connection port 2031, and the AC output port 2032 to be connected to the charging port of the powered device 206 when the voltage of the first charging connection port 20221 is the first voltage; when the voltage of the first charging connection port 20221 is the second voltage, when the voltage of the connection confirmation port 2022 is the second voltage, control the input end of the power conversion circuit 201 to be connected to the AC power grid 205, the power supply port 202 to be connected to the charging port of the powered device 206, and transmit the charging communication signal between the off-board charger 200 and the powered device 206 through the second charging connection port 20222.

[0065] According to different voltage values ​​of the first charging connection port 20221, the charging mode of the powered device 206 can be determined. Exemplarily, when the voltage value of the first charging connection port 20221 is 9V, it is determined that the powered device 206 is in the AC charging mode, and the AC power grid 205 is controlled to be connected to the power supply port 202, and the power supply port 202 is connected to the charging port of the powered device 206 through the adapter 203; when the voltage value of the first charging connection port 20221 is 6V, it is determined that the powered device 206 is in the DC charging mode, and the AC power grid 205 is controlled to be connected to the power conversion circuit 201, and the power supply port 202 is connected to the charging port of the powered device 206.

[0066] Among them, the first charging connection port 20221 can be used as the CC1 port for DC charging communication handshake, and the second charging connection port 20222 can be used as the CC2 port for DC charging communication handshake. Exemplarily, during the charging process, the off-board charger 200 continuously monitors the connection status of the charging plug and the charging socket through the input voltage signal of the CC1 port. Once an abnormality occurs, the off-board charger 200 immediately disconnects the output of the power supply port 202. If the powered device 206 does not receive the charging level requirement message or impedance message periodically sent by the CC2 port within 100ms, the powered device 206 will also disconnect the power supply port 202. The specific communication handshake steps and message transmission methods of the CC1 port and the CC2 port in the off-board charger 200 should be known to those skilled in the art, and will not be repeated here. In this way, the off-board charger 200 provided in the embodiment of the present application can also charge the powered device 206 in the DC charging mode when it is not connected to the adapter 203.

[0067] When it is necessary to charge the powered device 206 in the AC charging mode, the first power port 20311 and the third charging connection port 20312 included in the connection port 2031 of the adapter 203, and the second power port 20321, the fourth charging connection port 20322 and the charging control confirmation port 20323 included in the AC output port 2032 are used to transform the power supply port 202 into an interface for connection and communication with the AC powered port.

[0068] Among them, the first power port 20311 and the second power port 20321 in the adapter 203 serve as electrical connection ports on both sides of the adapter 203, the power supply port 202 is connected to the first power port 20311, and the first power port 20311 is connected to the second power port 20321. The power supply port 202, the first power port 20311 and the second power port 20321 are configured to be connected in series, so that the power supply port 202 is charged with the powered device 206 in AC charging mode through the adapter 203, and the second charging connection port 20222 is in an empty plug state.

[0069] The first charging connection port 20221 is connected to the third charging connection port 20312 , and the third charging connection port 20312 is connected to the charging control confirmation port 20323 . The charging control confirmation port 20323 serves as a CP signal port for transmitting a CP signal during AC charging.

[0070] To match the signal requirements of the CC signal port for transmitting CC signals and the CP signal port for transmitting CP signals, refer to Figure 4 As shown, Figure 4 A schematic diagram of the structure of a non-vehicle charger Figure 3As a possible implementation manner, the off-board charger 200 further includes: a first grounding port 2023, a first resistor 2024 and a first switch 2025, the connection port 2031 further includes: a second grounding port 20313, and the AC output port 2032 further includes: a third grounding port 20324; the first grounding port 2023, the second grounding port 20313 and the third grounding port 20324 are configured to be connected in series, and the first grounding port 2023 is connected in series with the first charging connection port 20221 through the first resistor 2024 and the first switch 2025; when the power supply port 202 is connected to the adapter 203, the first switch 2025 is triggered to close, so that the voltage of the first charging connection port 20221 in the connection confirmation port 2022 becomes the first voltage; when the power supply port 202 is disconnected from the adapter 203, the first switch 2025 is triggered to open, so that the voltage of the first charging connection port 20221 in the connection confirmation port 2022 becomes the second voltage.

[0071] The first grounding port 2023 , the second grounding port 20313 and the third grounding port 20324 are configured to be connected in series, and can be used as a protective grounding port to pass through the connection between the power supply port 202 and the adapter 203 .

[0072] When the first charging connection port 20221 , the third charging connection port 20312 , and the charging control confirmation port 20323 are configured to be connected in series, a charging communication signal between the off-board charger 200 and the powered device 206 may be transmitted.

[0073] When the first switch 2025 is closed and the first resistor 2024 is connected to the circuit, the resistance increases and the divided voltage increases, so the voltage of the first charging connection port 20221 becomes the first voltage. When the first switch is opened, the first resistor 2024 is not connected to the circuit, the resistance decreases, the divided voltage decreases, and the voltage of the first charging connection port 20221 becomes the second voltage.

[0074] Among them, the first switch 2025 can be interlocked through a set mechanical structure or electrical method and the connection state of the adapter 203, that is, when the power supply port 202 is connected to the adapter 203, the interlocking state is triggered and the first switch 2025 is closed; when the power supply port 202 is disconnected (connected) from the adapter 203, the interlocking state is released and the first switch 2025 is disconnected, so that the first charging connection port 20221 is disconnected from the ground wire.

[0075] As a possible implementation, see Figure 5 As shown, Figure 5A schematic diagram of the structure of a non-vehicle charger Figure 4 The off-board charger 200 further includes: a second resistor 2026, and the first ground port 2023 is connected to the second charging connection port 20222 via the second resistor 2026. When the powered device 206 is in the DC charging mode, the AC power grid 205 is controlled to be connected to the power conversion circuit 201, and when the power supply port 202 is connected to the charging port of the powered device 206, the second charging connection port 20222 is connected to the powered device 206 as a CC2 port.

[0076] As a possible implementation, see Figure 6 As shown, Figure 6 Schematic diagram of the structure of the identification resistor circuit; one end of the identification resistor circuit 2033 is connected to the third ground port 20324, and the other end of the identification resistor circuit 2033 is connected to the fourth charging connection port 20322. Exemplarily, the identification resistor circuit 2033 includes a plurality of resistors and a control switch, and the resistance output by the identification resistor circuit 2033 can be adjusted by opening and closing the control switch to comply with the "Electric Vehicle Conductive Power Supply System Standard".

[0077] As a possible implementation, see Figure 7 As shown, Figure 7 A schematic diagram of the structure of a non-vehicle charger Figure 5 The off-board charger 200 further includes a positive power port 20211 and a negative power port 20212. The AC power grid 205 is connected to the input end of the power conversion circuit 201 through a first-phase AC power port, a second-phase AC power port, and a third-phase AC power port, or the AC power grid 205 is connected to the positive power port 20211 through any one of the first-phase AC power port, the second-phase AC power port, and the third-phase AC power port, and the negative power port 20212 is connected to the three-phase input neutral line of the AC power grid.

[0078] As a possible implementation, see Figure 8 As shown, Figure 8 A schematic diagram of the structure of a non-vehicle charger Figure 6 The off-board charger 200 further includes: a second switch group 207 and a third switch group 208; the AC power grid 205 is connected to the power supply port 202 via the second switch group 207, and the power supply port 202 is connected to the third switch group 208 via the power conversion circuit 201. When the second switch group 207 is closed, the third switch group 208 is disconnected, and when the second switch group 207 is disconnected, the third switch group 208 is closed.

[0079] Among them, the closing relationship of the switch groups on both sides of the power conversion circuit 201 is also mutually exclusive. When it is determined that the powered device 206 is in the AC charging mode, the identification resistance of the AC output port 2032 is adjusted to the target resistance, and the AC power grid 205 is controlled to be connected to the power supply port 202 through the second switch group 207, and the power supply port 202 is connected to the charging port of the powered device 206 through the adapter 203; and when the powered device 206 is in the DC charging mode, the AC power grid 205 is controlled to be connected to the third switch group 208 through the power conversion circuit 201, and the power supply port 202 is directly connected to the charging port of the powered device 206.

[0080] As a possible implementation, the controller 204 is also used to: output a first communication signal to the connection confirmation port 2022 when the adapter 203 is connected to the power supply port 202 (when the powered device 206 is in DC charging mode); and output a second communication signal to the connection confirmation port 2022 when the adapter 203 is disconnected from the power supply port 202 (when the powered device 206 is in AC charging mode).

[0081] Among them, the controller 204 can realize the control guidance function, and can realize the DC / AC handshake communication requirements of all electric vehicles that meet the national standards. When the adapter 203 is connected to the power supply port 202, that is, it is determined that the power receiving device 206 is in the AC charging mode, because the CP signal required for the AC charging mode communication is a PWM signal, therefore, when the power receiving device 206 is in the AC charging mode, a first communication signal (PWM signal) is output to the connection confirmation port 2022, and when the adapter 203 is disconnected from the power supply port 202, that is, it is determined that the power receiving device is in the DC charging mode, because the CC1 signal required for the DC charging mode communication is a step signal, a second communication signal (step signal) is output to the connection confirmation port 2022.

[0082] Exemplarily, the controller 204 may output a step signal with an amplitude of 0 to NV or a PWM signal with a duty cycle of D and an amplitude of 0 to NV. Wherein, the value range of D is 0% to 100%, and N is a positive integer. The controller 204 uses different PWM duty cycles of the first communication signal and different signal amplitudes to encode, thereby indicating to the powered device 206 the current, voltage and other parameters that the off-board charger 200 can be used for charging. In some examples, the national standard requires that the value of N can be 6V, 9V or 12V, and the powered device 206 can obtain the current, voltage and other parameters that the off-board charger 200 can provide for charging according to the duty cycle and signal amplitude of the CP signal. When the duty cycle D is between 10% and 85%, the maximum charging current that the off-board charger 200 can provide is I=D*100*0.6; and when the duty cycle D=0%, it indicates that the off-board charger 200 is unavailable, etc.

[0083] As a possible implementation, see Fig. 9 As shown, Fig. 9 A schematic diagram of the structure of a non-vehicle charger Figure 7 ; The off-board charger 200 also includes: an auxiliary power supply 209, an auxiliary source positive port 2091 and an auxiliary source negative port 2092, the output positive end of the auxiliary power supply 209 is connected to one end of the auxiliary source positive port 2091, and the output negative end of the auxiliary power supply 209 is connected to one end of the auxiliary source negative port 2092; when the power supply port 202 is connected to the adapter 203, the other end of the auxiliary source positive port 2091 and the other end of the auxiliary source negative port 2092 are in an idle state.

[0084] In actual applications, the power supply port of the DC non-on-board charger 200 has two more ports than the power supply port of the DC non-on-board charger 200, namely, the auxiliary source positive port 2091 (A+) and the auxiliary source negative port 2092 (A-). There is no actual signal or current transmission between them and the powered device 206, so these two ports are set to an empty state and do not need to be connected to the powered device 206.

[0085] As a possible implementation, see Fig.10 As shown, Fig.10 A schematic diagram of the structure of a non-vehicle charger Figure 8 ; The power conversion circuit 201 includes: an AC-to-DC circuit 2011 and a DC-to-DC circuit 2012; the input end of the AC-to-DC circuit 2011 and the power supply port 202 are used to connect to the AC power grid 205, the output end of the AC-to-DC circuit 2011 is connected to the input end of the DC-to-DC circuit 2012, and the output end of the DC-to-DC circuit 2012 is connected to the power supply port 202.

[0086] Among them, the alternating current-direct current (AC-DC) circuit 2011 is used to convert the AC power provided by the AC power grid 205 into DC power, and the direct current-direct current (DC-DC) circuit 2012 is used to adjust the DC voltage output by the AC-DC circuit 2011 to meet the charging requirements of the powered device 206.

[0087] It should be noted that the internal connection method of the above power supply port 202 and the adapter 203 is only an example of the embodiment of the present application. In the embodiment of the present application, the internal connection method of the port can be modified within the scope specified by the national standard, and it only needs to be compatible with the DC / AC charging function of the vehicle, and there is no restriction on this.

[0088] See also Fig.11 As shown, the present application exemplarily provides a flow chart of charging control strategy steps of a non-vehicle charger, including:

[0089] Step S1101: the controller 204 obtains the voltage of the connection confirmation port 2022 and determines the charging mode of the powered device 206;

[0090] Step S1102: When the voltage of the connection confirmation port 2022 is 9V, execute step S1103; when the voltage of the connection confirmation port 2022 is 6V, execute step S1104; otherwise, execute step S1105.

[0091] Step S1103: the controller 204 controls the off-board charger 200 to enter the AC charging state.

[0092] Step S11031 : the controller 204 transmits the PWM charging communication signal between the off-board charger 200 and the powered device 206 via the first charging connection port 20221 , the third charging connection port 20312 , and the charging control confirmation port 20323 .

[0093] Step S11032 : the controller 204 controls the AC power grid 205 to connect to the power supply port 202 through the second switch group 207 , so as to perform AC charging on the powered device 206 .

[0094] Step S1104: the controller 204 controls the off-board charger 200 to enter a DC charging state.

[0095] Step S11041 : the controller 204 implements a communication handshake via the first charging connection port 20221 and the second charging connection port 20222 .

[0096] Step S11042 : the controller 204 controls the AC power grid 205 to connect to the input end of the power conversion circuit 201 through the third switch group 208 , so as to perform DC charging on the powered device 206 .

[0097] Step S1105: the controller 204 reports an error and controls the off-board charger 200 to stop supplying power.

[0098] The off-board charger provided in this application is compatible with all types of electric vehicles on the market. It can provide DC charging services for pure electric vehicles and AC charging services for plug-in hybrid vehicles. In addition, due to the newly added conversion head design, an off-board charger can simultaneously realize both AC charging and DC charging functions, and eliminate the AC charging gun cable, saving costs.

[0099] Based on the same concept, the present application also provides a charging system, which includes a charging pile and a powered device. The charging pile includes the non-vehicle-mounted charger as described in the above embodiment; the charging pile is used to charge the powered device.

[0100] Based on the same concept, the present application also provides a charging station, which includes at least one charging pile, each of which includes a non-on-board charger as described in the above embodiment; the charging pile is used to charge a powered device connected thereto.

[0101] 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 present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0102] 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 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 produce 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.

[0103] 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.

[0104] 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. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0105] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A non-vehicle charger, characterized in that: The off-board charger includes: a power conversion circuit, a power supply port, an adapter, a controller and a connection confirmation port; The output end of the power conversion circuit is connected to the power supply port; The adapter includes a connection port and an AC output port, the connection port is configured to be connected to the power supply port, and the AC output port is configured to be connected to the charging port of the powered device; The controller is used to: when the adapter is connected to the power supply port, control the power supply port to be connected to the AC power grid, the power supply port to be connected to the connection port, and the AC output port to be connected to the charging port of the powered device; When the adapter is disconnected from the power supply port, controlling the input end of the power conversion circuit to be connected to the AC power grid, and the power supply port to be connected to the charging port of the powered device; The controller is specifically used to: when the voltage of the connection confirmation port is a first voltage, control the power supply port to be connected to the AC power grid, the power supply port to be connected to the connection port, and the AC output port to be connected to the charging port of the powered device; When the voltage of the connection confirmation port is a second voltage, the input end of the power conversion circuit is controlled to be connected to the AC power grid, and the power supply port is connected to the charging port of the powered device.

2. The off-board charger according to claim 1, characterized in that: The adapter further includes: an identification resistance circuit, the identification resistance circuit is used to adjust the identification resistance of the AC output port; The controller is also used to: when the adapter is connected to the power supply port, control the identification resistance circuit to adjust the identification resistance of the AC output port so that the identification resistance of the AC output port is the target resistance, so that the off-board charger and the powered device complete handshake communication.

3. The off-board charger according to claim 2, characterized in that: The connection confirmation port specifically includes: a first charging connection port and a second charging connection port; The connection port specifically includes: a first power port and a third charging connection port; the AC output port specifically includes: a second power port, a fourth charging connection port and a charging control confirmation port; the power supply port, the first power port and the second power port are configured to be connected in series, and the first charging connection port, the third charging connection port and the charging control confirmation port are configured to be connected in series; The controller is specifically used to: when the voltage of the first charging connection port is a first voltage, control the power supply port to be connected to the AC power grid, the power supply port to be connected to the connection port, and the AC output port to be connected to the charging port of the powered device; When the voltage of the first charging connection port is a second voltage, the input end of the power conversion circuit is controlled to be connected to the AC power grid, the power supply port is connected to the charging port of the powered device, and the charging communication signal between the off-board charger and the powered device is transmitted through the second charging connection port.

4. The off-board charger according to claim 3, characterized in that: The off-board charger further includes: a first grounding port, a first resistor and a first switch; the connection port further includes: a second grounding port; the AC output port further includes: a third grounding port; the first grounding port, the second grounding port and the third grounding port are configured to be connected in series, and the first grounding port is connected in series with the first charging connection port through the first resistor and the first switch; When the power supply port is connected to the adapter, the first switch is triggered to close so that the voltage of the first charging connection port becomes a first voltage; when the power supply port is disconnected from the adapter, the first switch is triggered to open so that the voltage of the first charging connection port becomes a second voltage.

5. The off-board charger according to claim 4, characterized in that: The off-board charger further includes: a second resistor, and the first ground port and the second charging connection port are connected via the second resistor.

6. The off-board charger according to claim 3, characterized in that: One end of the identification resistance circuit is connected to the third ground port, and the other end of the identification resistance circuit is connected to the fourth charging connection port.

7. The off-board charger according to claim 3, characterized in that: When the first charging connection port, the third charging connection port and the charging control confirmation port are configured to be connected in series, they are suitable for transmitting a charging communication signal between the off-board charger and the power receiving device.

8. The off-board charger according to claim 1, characterized in that: The off-board charger also includes a positive end of a power port and a negative end of a power port. The AC power grid is connected to the input end of the power conversion circuit through a first-phase AC power port, a second-phase AC power port, and a third-phase AC power port, or the AC power grid is connected to the positive end of the power port through any one of the first-phase AC power port, the second-phase AC power port, and the third-phase AC power port, and the negative end of the power port is connected to the three-phase input neutral line of the AC power grid.

9. The off-board charger according to claim 1, characterized in that: The off-board charger further includes: a second switch group and a third switch group; The AC power grid is connected to the power supply port through the second switch group, and the AC power grid is connected to the input end of the power conversion circuit through the third switch group; when the second switch group is closed, the third switch group is disconnected, and when the second switch group is disconnected, the third switch group is closed.

10. The off-board charger according to claim 1, characterized in that: The controller is further used for: When the adapter is connected to the power supply port, outputting a first communication signal to the connection confirmation port; When the adapter is disconnected from the power supply port, a second communication signal is output to the connection confirmation port.

11. The off-board charger according to claim 1, characterized in that: The off-board charger also includes: an auxiliary power supply, an auxiliary source positive port and an auxiliary source negative port, the output positive end of the auxiliary power supply is connected to one end of the auxiliary source positive port, and the output negative end of the auxiliary power supply is connected to one end of the auxiliary source negative port; when the power supply port is connected to the adapter, the other end of the auxiliary source positive port and the other end of the auxiliary source negative port are in an idle state.

12. The off-board charger according to claim 1, characterized in that: The power conversion circuit includes: an AC to DC circuit and a DC to DC circuit; The input end of the AC-to-DC circuit and the power supply port are used to connect to the AC power grid, the output end of the AC-to-DC circuit is connected to the input end of the DC-to-DC circuit, and the output end of the DC-to-DC circuit is connected to the power supply port.

13. A charging system, characterized in that: The charging system includes a charging pile and a power receiving device, wherein the charging pile includes the off-board charger according to any one of claims 1 to 12; The charging pile is used to charge the powered device.

14. A charging station, characterized in that: The charging station includes at least one charging pile, each of which includes the off-board charger as described in any one of claims 1 to 12; the charging pile is used to charge the powered device connected thereto.

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