CN112248841B - Electric automobile charging plug supporting ordered charging and method for realizing ordered charging - Google Patents
Electric automobile charging plug supporting ordered charging and method for realizing ordered charging Download PDFInfo
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- CN112248841B CN112248841B CN202011521962.3A CN202011521962A CN112248841B CN 112248841 B CN112248841 B CN 112248841B CN 202011521962 A CN202011521962 A CN 202011521962A CN 112248841 B CN112248841 B CN 112248841B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
- B60L53/16—Connectors, e.g. plugs or sockets, specially adapted for charging electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The invention relates to an electric automobile charging plug supporting ordered charging and a method for realizing ordered charging. The charging plug of the electric automobile can receive three-phase line signals L1, L2 and L3, a zero line signal N, a protective grounding signal PE, a connection confirmation signal CC and a control guide signal CP provided by power supply equipment, and transmits the received L1, L2, L3, N, PE and CC signals to the vehicle outlet through the electrical contacts, it is characterized in that the body of the electric automobile charging plug also comprises a logic adapter circuit and a micro control unit, the logic adaptation circuit is used for generating a CP substitute signal under the control of the micro control unit, and the CP signal is transmitted to a vehicle socket instead of the CP signal in the energy transmission stage of the charging process of the electric automobile, wherein during the energy transfer phase, the CP substitute signal is in the form of a pulse width modulated signal and has a duty cycle that is independent of the duty cycle of the CP signal provided by the power supply.
Description
Technical Field
The invention relates to an electric vehicle charging plug capable of supporting ordered charging and a method for realizing ordered charging, in particular to a scheme for adjusting charging current drawn by a vehicle-mounted charger through a circuit built in the charging plug under the condition that the technical transformation of the alternating current charger (station) is not needed.
Background
Electric vehicles can be charged by an external charger (station). The industrial standards of electric vehicles, such as the current national standard GB/T18487.01-2015, specify 4 charging modes and 3 connection modes for charging electric vehicles. The charging mode 3 is applied to a case where a power supply apparatus connected to an ac power grid connects an electric vehicle with the ac power grid. Charging mode 3 is typically connected in a connection mode C (the cable assembly includes a charging cable having one end permanently connected to the power supply device, and the other end of the cable is provided with a vehicle plug). Fig. 1 shows a schematic diagram of the connection mode C given in the current national standard.
For charging mode 3, the industry standard requires that a control pilot device be provided on the power supply equipment (i.e., the charger) to transmit and communicate signals between the electric vehicle and the power supply equipment to guide the vehicle-mounted charger to complete charging. The control guidance during charging in the charging mode 3 is mainly realized based on CC and CP signals given by the power supply equipment and the detection result of the vehicle control device at the corresponding detection point. Figure 2 shows a schematic diagram of the control steering circuit for charge mode 3 and connection mode C given in the current national standard. The vehicle control device confirms the rated capacity of the current charging connecting device (cable) by measuring the resistance value between the detection point 3 and the PE, and confirms the maximum power supply current of the current power supply equipment by measuring the PWM signal duty ratio of the detection point 2. The charging process is mainly controlled by the electric vehicle (for example, the magnitude of the current drawn by the vehicle-mounted charger from the power supply equipment is finally determined by the vehicle control device), but the limit conditions set by the current-carrying capacity and the maximum power supply given by the detection points 3 and 2 should be observed.
The industry standards also specify contact arrangements for vehicle interfaces (vehicle sockets) and power supply interfaces (vehicle plugs/charging guns) for ac charging, including L1, L2, L3, N, PE, CC, and CP. Fig. 3A shows the plug electrical contact arrangement of the ac charging interface given in the current national standard. Fig. 3B shows the socket electrical contact arrangement of the ac charging interface given in the current national standard.
In a typical application scenario, the CC and CP signals for the control pilot are therefore provided by the charger (stub) to the electric vehicle via the CC and CP contacts of the vehicle plug/charging gun.
In order to solve the increasing contradiction between the power demand of the electric automobile and the load capacity of the power grid, the concept of "orderly charging" of the electric automobile is proposed. The ordered charging strategy aims to intervene and adjust the charging of the electric automobile on the premise of meeting the charging requirement of the electric automobile, so that the load curve of the power grid is subjected to peak clipping and valley filling, the variance of the load curve is smaller, and the construction of the installed capacity of power generation is reduced.
For the charging mode 3, one method for achieving ordered charging under the national standard rules is to adjust the CP signal in real time to dynamically respond to the ordered charging strategy of the grid. Generally, this implies a technical adaptation of the control pilot circuit of the charger (stake). However, the chargers (piles) are widely distributed in communities, are numerous and are often produced by a plurality of manufacturers, and in addition, the modified chargers (piles) need to be agreed by the owner of the equipment, so that the difficulty and cost of technical modification are high.
Disclosure of Invention
The invention aims to provide a charging plug of an electric automobile, which can be plugged into a charging socket of the electric automobile, wherein a Micro Control Unit (MCU) and a logic adaptation circuit are arranged in the charging plug, and the logic adaptation circuit can generate a CP substitute signal in the form of a PWM signal under the control of the MCU and provide the CP substitute signal to the charging socket of the electric automobile through a CP contact in the charging plug.
According to one aspect of the present invention, there is provided an electric vehicle charging plug capable of receiving three-phase line signals L1, L2, L3, a neutral line signal N, a protection ground signal PE, a connection confirmation signal CC, and a control pilot signal CP provided from a power supply device, and transmits the received L1, L2, L3, N, PE and CC signals to the vehicle outlet through the electrical contacts, it is characterized in that the body of the electric automobile charging plug also comprises a logic adapter circuit and a micro control unit, the logic adaptation circuit is used for generating a CP substitute signal under the control of the micro control unit, and the CP signal is transmitted to a vehicle socket instead of the CP signal in the energy transmission stage of the charging process of the electric automobile, wherein during the energy transfer phase, the CP substitute signal is in the form of a pulse width modulated signal and has a duty cycle that is independent of the duty cycle of the CP signal provided by the power supply.
In the above scheme of the charging plug for the electric vehicle, optionally, the power supply device is a charger or a charging pile connected to an ac power grid.
In the above electric vehicle charging plug solution, optionally, the electric vehicle charging plug is a charging gun connected to the power supply device through a cable.
In the above electric vehicle charging plug scheme, optionally, the micro control unit receives information indicating the ordered charging maximum current issued based on the grid ordered charging scheme, and the micro control unit can control the logic adaptation circuit to generate a CP substitute signal to have a duty ratio corresponding to the ordered charging maximum current.
In the above scheme of the electric vehicle charging plug, optionally, the electric vehicle charging plug further includes a communication module in the body, and the communication module interacts with the micro control unit and an external intelligent terminal respectively, so as to receive information indicating the ordered charging maximum current.
In the above electric vehicle charging plug scheme, optionally, the CP signal from the power supply device indicates a maximum current of the power supply device, and the micro control unit is configured to compare the ordered charging maximum current and the maximum current of the power supply device, and generate a PWM signal corresponding to the ordered charging maximum current as the CP substitute signal when the ordered charging maximum current is smaller than the maximum current of the power supply device.
In the above electric vehicle charging plug scheme, optionally, when the sequential charging maximum current is not less than the power supply apparatus maximum current, the CP signal from the power supply apparatus is taken as the CP signal output to the vehicle outlet.
In the above-mentioned electric vehicle charging plug scheme, optionally, when the sequential charging maximum current is not less than the power supply device maximum current, the duty ratio of the generated CP substitute signal is made to be the same as the duty ratio of the CP signal from the power supply device.
In the above electric vehicle charging plug scheme, optionally, the CP signal from the power supply device indicates a maximum current of the power supply device, and the micro control unit is configured to compare the ordered charging maximum current and the maximum current of the power supply device, and when the ordered charging maximum current is greater than or equal to the maximum current of the power supply device, take the CP signal from the power supply device as the CP signal output to the vehicle outlet.
In the above electric vehicle charging plug scheme, optionally, the CP signal from the power supply device indicates a maximum current of the power supply device, and the micro control unit is configured to compare the ordered charging maximum current and the maximum current of the power supply device, and when the ordered charging maximum current is greater than or equal to the maximum current of the power supply device, make a duty ratio of the generated CP substitute signal and a duty ratio of the CP signal from the power supply device consistent.
In the above-mentioned electric vehicle charging plug scheme, optionally, when there is no ordered charging demand, the micro control unit takes the CP signal from the power supply device as the CP signal output to the vehicle outlet, or makes the duty ratio of the generated CP substitute signal and the duty ratio of the CP signal from the power supply device coincide
IN the above electric vehicle charging plug solution, optionally, the logic adapter circuit is configured to convert the CP signal from the power supply device into a CP _ IN _ ADC signal capable of being input to the micro control unit.
IN the above electric vehicle charging plug scheme, optionally, the micro control unit determines the start of the electric vehicle charging process based on the monitoring of the CP _ IN _ ADC signal.
In the above electric vehicle charging plug solution, optionally, the logic adapter circuit is configured to convert the CP substitute signal into a CP _ OUT _ ADC signal that can be input to the micro control unit.
In the above electric vehicle charging plug scheme, optionally, the logic adapter circuit includes a pulse width modulation signal generating circuit, the pulse width modulation signal generating circuit includes a preceding stage amplifying circuit and a succeeding stage comparator, a pulse width modulation enable signal from the micro control unit is fed into a transistor base of the preceding stage amplifying circuit, a collector of the transistor is pulled up by a resistor and fed into a positive input terminal of the succeeding stage comparator, and a reference voltage is fed into a negative input terminal of the succeeding stage comparator, so as to generate an output at DC12V level.
According to one aspect of the present invention, a method for realizing ordered charging based on an electric vehicle charging plug is provided, the electric vehicle charging plug is capable of receiving three-phase line signals L1, L2, L3, a neutral line signal N, a protection grounding signal PE, a connection confirmation signal CC and a control pilot signal CP provided by a power supply device, and transmitting the received L1, L2, L3, N, PE and CC signals to a vehicle socket through an electrical contact, the electric vehicle charging plug further comprises a logic adaptation circuit and a micro control unit in a body, the logic adaptation circuit is configured to generate a CP substitute signal under the control of the micro control unit, and transmit the CP substitute signal to the vehicle socket instead of the CP signal in an energy transmission stage of an electric vehicle charging process, wherein in the energy transmission stage, the CP substitute signal is in the form of a pulse width modulation signal, and the duty cycle of which is independent of the duty cycle of the CP signal provided by the power supply device, the method includes, by a micro control unit within the body of the electric vehicle charging plug: monitoring a CP signal from a power supply device; when the CP signal indicates the start of charging, judging whether an ordered charging demand which comes from the power grid and is received by the micro-control unit exists; when there is an orderly charging demand, a substitute CP signal that meets the orderly charging demand is transmitted to the vehicle outlet.
In the above method and apparatus for implementing ordered charging based on the charging plug of the electric vehicle, optionally, the substitute CP signal meeting the ordered charging requirement is transmitted to the vehicle socket in the following manner: when the ordered charging requirement exists and is smaller than the maximum power supply current indicated by the CP signal from the power supply equipment, generating a substitute CP signal corresponding to the ordered charging requirement; and passing the CP signal from the power sourcing equipment to the vehicle outlet or generating a substitute CP signal having a duty cycle that is consistent with the CP signal from the power sourcing equipment when there is an orderly power charging demand that is greater than or equal to the maximum power supply current indicated by the CP signal from the power sourcing equipment.
The invention can realize the following beneficial effects:
the invention can directly enable the charging plug to output the adjusted CP signal under the condition of not carrying out technical transformation on the charger (pile), thereby realizing the ordered charging of the electric automobile. Under the condition of following the existing industry standard, the function of ordered charging can be brought into a charging machine (pile) node only by carrying out technical transformation (or replacing the charging plug) on the charging plug, so that the realization of the ordered charging function in a community charging scene is greatly facilitated.
Drawings
Fig. 1 shows a schematic diagram of the connection mode C given in the current national standard.
Figure 2 shows a schematic diagram of the control steering circuit for charge mode 3 and connection mode C given in the current national standard.
Fig. 3A shows the plug electrical contact arrangement of the ac charging interface given in the current national standard.
Fig. 3B shows the socket electrical contact arrangement of the ac charging interface given in the current national standard.
Fig. 4 shows a schematic diagram of a charging system including a novel charging gun according to an embodiment of the present invention.
Fig. 5 is a schematic diagram illustrating a pulse width modulation signal generation circuit generating a PWM _ OUT output signal based on a control signal of a gun body MCU according to an embodiment of the present invention.
FIG. 6 is a flow chart illustrating a method of achieving orderly charging by the novel charging gun, according to an embodiment of the present invention.
Detailed Description
In the following description, the invention is described with reference to various embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details, or with other alternative and/or additional methods, materials, or components. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of embodiments of the invention. Similarly, for purposes of explanation, specific numbers, materials and configurations are set forth in order to provide a thorough understanding of the embodiments of the invention. However, the invention may be practiced without specific details. Further, it should be understood that the embodiments shown in the figures are illustrative representations and are not necessarily drawn to scale.
Fig. 4 shows a schematic diagram of a charging system 400 including a novel charging gun, according to an embodiment of the invention. The charging system 400 includes a charging pile 410 as a power supply device, a charging gun 430 as a charging plug, and an electric vehicle 440. Charging post 410 is operable in charging mode 3, i.e., connecting electric vehicle 440 to the ac power grid. The outputs of the charging post 410 include L1, L2, L3, N, PE (protection ground), CC (connection confirmation), and CP (control pilot). According to the current national standard, during the energy transfer phase, the CP signal is in the form of a PWM signal, the duty cycle of which represents the maximum supply current of the current supply device (i.e. the charging pile 410). Within the body of the charging gun 430 are included a logic adaptation circuit 432 and a gun body MCU 431 in connection with the implementation of the present invention.
Unlike the control pilot circuit schematic shown IN fig. 2, IN the charging system 400 of fig. 4, the CP signal provided by the charging post 410 is not directly connected to the charging socket of the electric vehicle, but is fed as a CP _ IN signal to the logic adapter circuit 432 IN the charging gun 430 and is further processed by the logic adapter circuit 432. The charging socket of the electric vehicle 440 receives the CP _ OUT signal generated and output by the logic adapter circuit 432 from the charging gun 430, not the CP signal directly from the charging gun 430.
During the energy transfer phase of the charging process, the CP _ OUT signal may be IN the form of a pulse width modulated signal similar to the CP _ IN signal, but may have a different duty cycle than the CP _ IN signal. In one implementation, the CP _ OUT signal with an independent duty cycle is generated by the logic adaptation circuit 432 from the output signal CTRL of the gun body MCU 431. Therefore, the maximum supply current known by the on-board charger 442 of the electric vehicle is not provided by the charging pile 410, but by the gun body MCU 431.
The charging gun 430 may further include a communication module 433 within the body for establishing a communication connection between the gun body MCU 431 and an external device (e.g., the smart terminal 420). The smart terminal 420 may be part of a smart grid or other similar concept system that is capable of running appropriate algorithmic logic to participate in implementing dynamic adjustments of grid load, enabling orderly charging. It should be understood that the ordered charging algorithm of the smart grid is not the object of the present invention, and the "grid ordered charging algorithm" or "grid ordered charging scheme" shall encompass any algorithm that can dynamically determine the maximum supply current of each end node of the grid (e.g., each charging pile (machine) of the community) based on the purpose of ordered charging.
The gun body MCU 431 can acquire information from the smart terminal 420 about the maximum supply current (referred to herein as "ordered charging maximum current") that the grid distributes to the current charging node, and determine the duty cycle of the CP _ OUT signal generated by the logic adaptation circuit 432 (when CP _ OUT is in the form of a PWM signal) based on the ordered charging maximum current. Therefore, under the control of the gun body MCU 431, the maximum supply current available for charging indicated by the CP _ OUT signal output by the charging gun 430 matches the requirement of the ordered charging maximum current allocated to the node by the grid for the purpose of ordered charging (such a match may be with the ordered charging maximum current or lower). In this way, during the charging process, the maximum current required by the onboard charger 442 of the electric vehicle 440 will be based on the maximum supply current indicated by CP _ OUT, rather than the maximum supply current indicated by CP output by the charging pile 410 (which will be referred to as "power supply device maximum current" in this application). The specific implementation manner of generating the CP _ OUT signal should not be construed as a limitation to the present invention, for example, the MCU may output a CMOS or TTL level signal (in the energy transmission stage of the electric vehicle, the level signal may be a signal with a predetermined duty ratio), and the level signal is output through the signal amplification circuit and fed into the comparator of the subsequent stage to obtain an output of DC12V level meeting the national standard.
IN a further embodiment, the logic adaptation circuit 432 processes the CP _ IN signal into a CP _ IN _ ADC that can be sampled by the gun body MCU 431. In the national standard, the CP signal at the detection point 1 shown in fig. 2 is 12V dc high level at the beginning and end of charging, and is in PWM form during the energy transfer phase. Thus, a change IN CP _ IN _ ADC may indicate the beginning and end of the charging process, and may indicate the maximum supply current that charging post 410 is capable of delivering during the energy transfer phase (referred to herein as "power supply maximum current"). The particular processing manner IN which the CP _ IN signal is converted so that it can be fed into the MCU should not constitute a limitation of the present invention. For example, IN the prior art, the technique of processing the CP signal at the on-board charger end so that it is input to the on-board MCU may be similarly applied to CP _ IN signal processing within the gun body. As an example and not by way of limitation, the logic adapter circuit 432 may include a resistor divider and RC filter circuit for obtaining a smoothed dc signal corresponding to the CP signal for input to the gun MCU 431.
In a further embodiment, the gun body MCU 431 can compare the charging post maximum supply current (power supply device maximum current) with the grid maximum supply current (sequenced charging maximum current), with the smaller of the two as the reference for generating CP _ OUT. Therefore, the MCU 431 is also constrained by the power supply capability of the charging pile 410 while following the ordered charging requirement of the smart grid, so that the current requirement generated by the vehicle-mounted charger 442 of the electric vehicle 440 based on the information of CP _ OUT is always enough to be actually met by the charging pile 410.
In a further embodiment, the CP _ OUT signal may be further converted by the logic adaptation circuit 432 into a dc signal CP _ OUT _ ADC suitable for collection by the gun body MCU 431. The gun body MCU 431 can thus determine whether the CP _ OUT signal generated by the charging gun 430 and output to the electric vehicle 440 is normal through the detection of the CP _ OUT _ ADC. The specific processing manner of the CP _ OUT signal should not be construed as limiting the invention, for example, the technology of processing the CP signal at the vehicle-mounted charger end to input the CP signal to the vehicle-mounted MCU in the prior art can be similarly applied to the CP _ OUT signal processing in the gun body. As an example and not by way of limitation, the logic adapter circuit 432 may include a resistor divider and an RC filter circuit to obtain a smooth dc signal corresponding to the CP _ OUT signal for input to the gun MCU 431.
Fig. 5 is a schematic diagram illustrating a pulse width modulation signal generation circuit generating a PWM _ OUT output signal based on a control signal of the gun body MCU 431 according to an embodiment of the present invention. As shown in fig. 5, the PWM _ EN signal is one of the CTRL signals output by the gun body MCU (e.g., gun body MCU 431 in fig. 4). The PWM _ EN signal is in a PWM form during the energy transmission stage, and the duty ratio can reflect the maximum output current distributed to the current charging pile 410 by the grid ordered charging scheme. The PWM _ EN signal may be low or 0 during the non-energy transfer phase. The circuit composed of the resistor R1 (resistor can be 1K omega) and the resistor R2 (resistor can be 10K omega) performs matched voltage division on PWM _ EN, so that the transistors Q1, R2 and a capacitor C1 (capacitance value can be 0.1 muF) are better driven to be connected in parallel to be beneficial to filtering. The collector of transistor Q1 is connected to DC12V through pull-up resistors R4 (resistor may be 4K7 Ω) and R5 (resistor may be 4K7 Ω) in parallel. The use of pull-up resistors can better regulate response speed, and at the same time, the parallel connection of R4 and R5 can alleviate the heating problem of a single resistor under the limited packaging size. The output of the collector may be fed to an input port of a comparator IC1, e.g., the 1IN + port of a comparator model LM 2903D. The corresponding 1 IN-port of the comparator may be connected between resistors R6 and R3, R6 (resistor may be 10K Ω) connected to DC12V at one end, R3 (resistor may be 51K Ω) connected to ground at one end, and R3 and a capacitor C2 (capacitance value may be 1 μ F) connected IN parallel for filtering benefit. The VCC port of the comparator is connected to 12V. Driven by the PWM _ EN signal, which is a pulse width modulated signal, the output PWM _ OUT of the comparator IC1 will be a PWM signal that meets the national CP specification. In addition, as shown in fig. 5, the output of IC1 may be pulled up through a suitable resistor R7 (which may be 510 Ω). Capacitors C3 (which may be 0.1 muf) and C4 (which may be 10 muf) in parallel are used for decoupling and filtering of the power supply. The PWM _ OUT signal obtained by the circuit of fig. 5 is subjected to voltage stabilization and filtering as needed, and then is used as the CP _ OUT finally output by the logic adaptation circuit 432 shown in fig. 4.
IN a further embodiment, the logic adapter circuit 432 may include appropriate switching circuitry to switch between a first state having CP _ IN directly as CP _ OUT and a second state having the signal generated by the pulse width modulation signal generation circuit as CP _ OUT under the control of the gun body MCU 431. IN another implementation, the logic adapter circuit 432 is capable of reproducing a PWM signal substantially identical to CP _ IN based on the PWM _ EN signal from the gun body MCU 431 without using a switching circuit to connect CP _ IN to CP _ OUT.
Although a specific circuit implementation for generating PWM _ OUT (and thus CP _ OUT) based on the PWM _ EN signal is shown, it should be understood that this is only one specific implementation of the present invention for independently generating CP _ OUT from the gun body. It should be pointed OUT again that the specific way of generating the CP _ OUT signal, the CP _ IN _ ADC signal and the CP _ OUT _ ADC signal can be accomplished by conventional design means IN the art without additional limitations on circuit performance and manufacturing cost, and therefore implementation of the present invention IN this respect should not be limited by the circuit design method and the adopted device parameters.
FIG. 6 is a flow chart illustrating a method of achieving orderly charging by the novel charging gun, according to an embodiment of the present invention.
In step 630, the gun MCU 431 can determine whether there is an orderly charging requirement. Such a determination may be made based on information received by the communication module 433 from the smart terminal 420. If the gun body MCU 431 determines that there is no orderly charging demand, the gun body may output a PWM signal corresponding to CP _ IN _ ADC (or, IN an embodiment, CP _ IN may be directly provided as CP _ OUT output to the electric vehicle). If the gun MCU 431 determines that there is an orderly charging demand, the process may further determine at step 640 whether the orderly charging demand is less than the current indicated by CP _ IN _ ADC (i.e., the maximum charging current that the charging post 410 can give as indicated by CP _ IN). If the ordered charging demand is less than the current indicated by CP _ IN _ ADC, then the output capability of the charging post 410 needs to be intervened, so a PWM signal corresponding to the ordered charging current with a duty cycle corresponding to the maximum current the grid allows the current node (i.e., the charging post 410) to output based on the ordered charging scheme is output at step 642. If the ordered charge demand is not less than (i.e., greater than or equal to) the current indicated by CP _ IN _ ADC, then no intervention is required IN the output capability of the charging post 410, and therefore a PWM signal corresponding to the current indicated by CP _ IN _ ADC is output (or CP _ IN is taken directly as the output) at step 644.
IN step 650, the gun MCU 431 determines whether the charging process is finished or terminated based on CP _ IN _ ADC. If the CP _ IN _ ADC has a numerical characteristic corresponding to the CP ending the shutdown phase, or there is no signal (e.g., plug and socket accidentally disconnected), then the process assumes that it is not currently IN the energy transfer phase and the process proceeds to step 660, otherwise the process returns to step 640 to continue to determine the PWM signal form of the CP _ OUT output based on the ordered charging requirements (IN other implementations, the process may return to step 630). In step 660, the gun body MCU 431 stops CP _ OUT from outputting the PWM signal, so the CP signal obtained by the vehicle charger 442 is no longer the PWM signal.
Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing disclosure is by way of example only, and is not intended to limit the present application. Various modifications, improvements and adaptations to the present application may occur to those skilled in the art, although not explicitly described herein. Such modifications, improvements and adaptations are proposed in the present application and thus fall within the spirit and scope of the embodiments of the present application.
Claims (12)
1. A charging plug for an electric vehicle, which is capable of receiving three-phase line signals L1, L2, L3, a neutral line signal N, a protection earth signal PE, a connection confirmation signal CC, and a control pilot signal CP provided from a power supply device, and directly transmitting the received L1, L2, L3, N, PE, and CC signals to a vehicle outlet through electrical contacts, characterized in that,
the electric vehicle charging plug body also comprises a logic adapter circuit and a micro-control unit, wherein the logic adapter circuit is used for converting a CP signal from a power supply device into a CP _ IN _ ADC signal which can be input into the micro-control unit, the micro-control unit generates a control signal CTRL based on the CP _ IN _ ADC signal and information which is issued based on a power grid ordered charging scheme and indicates ordered charging maximum current so as to control the logic adapter circuit to generate a CP substitute signal, and the CP substitute signal is used for replacing the CP signal to be transmitted to a vehicle socket IN an energy transmission stage of an electric vehicle charging process,
wherein during the energy transfer phase, the CP substitute signal is in the form of a pulse width modulated signal and has a duty cycle that is independent of the duty cycle of the CP signal provided by the power supply,
the L1, L2, L3, N, PE and CC signals received by the electric vehicle charging plug are not fed into the logic adaptation circuit and the micro control unit,
the logic adaptation circuit comprises a pulse width modulation signal generating circuit which comprises a front-stage amplifying circuit and a rear-stage comparator, a pulse width modulation enabling signal PWM _ EN in a control signal CTRL from the micro-control unit is fed into the base electrode of a transistor Q1 of the front-stage amplifying circuit, a collector terminal signal of a transistor Q1 is fed into a positive input terminal of the rear-stage comparator, a reference voltage signal is fed into a negative input terminal of the rear-stage comparator, and therefore a PWM signal which is in accordance with the national standard CP specification is output at an output port of the rear-stage comparator,
wherein, the collector signal of the transistor Q1 is connected to the DC12V power supply through the pull-up resistors R4 and R5 which are connected in parallel,
the reference voltage is taken from a connection point between a resistor R6 and a resistor R3 which are connected in series, one end of the resistor R6 is connected with a DC12V power supply, and one end of the resistor R3 is grounded.
2. The electric vehicle charging plug of claim 1, wherein the power supply device is a charger or charging post connected to an ac power grid.
3. The electric vehicle charging plug of claim 1, wherein the electric vehicle charging plug is a charging gun connected to the power supply device by a cable.
4. The electric vehicle charging plug of any one of claims 1-3, wherein the micro control unit is capable of controlling the logic adaptation circuit to generate a CP substitution signal to have a duty cycle corresponding to the ordered charging maximum current.
5. The electric vehicle charging plug of claim 4, further comprising a communication module in the body of the electric vehicle charging plug, wherein the communication module respectively interacts with the micro control unit and an external intelligent terminal so as to receive information indicating the ordered charging maximum current.
6. The electric vehicle charging plug of claim 4, wherein the CP signal from the power supply indicates a power supply maximum current, the micro control unit is configured to compare the ordered charging maximum current and the power supply maximum current, and when the ordered charging maximum current is less than the power supply maximum current, to generate a PWM signal corresponding to the ordered charging maximum current as the CP substitute signal.
7. The charging plug for an electric vehicle according to claim 6, wherein when the sequential charging maximum current is not less than the power supply apparatus maximum current, the CP signal from the power supply apparatus is taken as the CP signal output to the vehicle outlet.
8. The charging plug for an electric vehicle according to claim 6, wherein when the sequential charging maximum current is not less than the power supply apparatus maximum current, the duty ratio of the generated CP substitute signal is made to coincide with the duty ratio of the CP signal from the power supply apparatus.
9. The charging plug for an electric vehicle according to claim 4, wherein the micro control unit takes the CP signal from the power supply device as the CP signal output to the outlet of the vehicle or makes the duty ratio of the generated CP substitute signal and the duty ratio of the CP signal from the power supply device coincide when there is no orderly charging demand.
10. The electric vehicle charging plug of claim 1, wherein the micro-control unit determines the start of an electric vehicle charging process based on monitoring the CP _ IN _ ADC signal.
11. The electric vehicle charging plug of any one of claims 1-3, wherein the logic adapter circuit is configured to convert the CP substitute signal to a CP _ OUT _ ADC signal that can be input to the micro control unit.
12. The charging plug of an electric vehicle as claimed in any one of claims 1 to 3, wherein the R6 resistor is 10K Ω, the R3 resistor is 51K Ω, the R4 resistor and the R5 resistor are 47K Ω, and the post comparator is LM 2903D.
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| CN115241905B (en) * | 2022-09-20 | 2022-12-09 | 云南丁旺科技有限公司 | Ordered charging control method |
| CN117284144B (en) * | 2023-11-24 | 2024-03-19 | 江苏羿邦新能源科技有限公司 | New energy electric automobile EVCC communication module |
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