CN109823207B - An electric vehicle charging system and its control method - Google Patents

Abstract

The embodiment of the present application discloses an electric vehicle charging system, including: a plurality of charging subsystems and a control box; a controller is arranged in the control box; each charging subsystem includes: a contactor, a charging device, a current transformer, and a Rectifier module; one end of the contactor is used to connect with the AC power supply, and the other end is connected to the charging device through the power supply cable; each contactor is electrically connected to the controller, and the controller is used to control the corresponding contactor to close when the electric vehicle needs to be charged ; Charging equipment includes: electricity meter and power supply port. The electric vehicle charging system disclosed in the embodiment of the present application solves the technical problem of setting up charging equipment in a whole range in a parking lot, which obviously requires a lot of money, but it is difficult to obtain higher income. In addition, the embodiment of the present application also discloses a method for controlling an electric vehicle charging system.

Description

An electric vehicle charging system and its control method

technical field

The present application relates to the technical field of vehicle charging, and in particular, to an electric vehicle charging system and a control method thereof.

Background technique

At present, some parking lots have set up charging equipment near some parking spaces to facilitate the use of electric vehicles. However, if the parking lot area is very wide and the location of the charging equipment is unreasonable, it is difficult for the user to find a parking space equipped with the charging equipment. In addition, when there is a shortage of parking spaces in the parking lot, some fuel vehicles may occupy the parking spaces equipped with charging equipment, which makes it difficult for users of electric vehicles to park and charge and reduces the user experience.

In order to solve the problem of inconvenient use of parking spaces for electric vehicle users, special parking spaces with charging equipment can be specially managed by parking lot managers, so as to avoid fuel vehicles occupying these parking spaces. However, this management method is easy to cause dissatisfaction of fuel vehicle users in the case of tight parking spaces, thus easily causing disputes over the use of parking spaces; at the same time, if the special parking spaces under management do not park electric vehicles, it will result in a waste of management costs.

Based on this, a trade-off solution is to deploy charging equipment in all parking spaces in the parking lot, which can not only meet the parking and charging needs of electric vehicle users, but also meet the needs of fuel vehicles for the use of parking spaces. However, a practical problem with this method is that the number of fuel vehicles on the market still has a large advantage over electric vehicles. However, it obviously requires a lot of money to set up charging equipment in the parking lot. Difficult to obtain higher returns.

SUMMARY OF THE INVENTION

The embodiments of the present application provide an electric vehicle charging system, which solves the technical problem of setting up charging equipment in a full range in a parking lot, which obviously requires a lot of money, but it is difficult to obtain high returns. In addition, the embodiments of the present application also provide a method for controlling an electric vehicle charging system.

In view of this, a first aspect of the present application provides an electric vehicle charging system, including: a plurality of charging subsystems and a control box;

A controller is arranged in the control box;

Each of the charging subsystems includes: a contactor, a charging device, a current transformer and a rectifier module;

One end of the contactor is used to connect with the AC power supply, and the other end is connected to the charging device through a power supply cable; each of the contactors is electrically connected to the controller, and the controller is used when the electric vehicle needs to be charged , control the corresponding contactor to close;

The current transformer is used to detect the current on the corresponding power supply circuit in real time, and send the detected current to the rectifier module;

the rectification module, configured to rectify the current detected by the current transformer into a DC signal, and send the DC signal to the controller;

The charging device includes: an electricity meter and a power supply port;

The electric meter is connected in series in the power supply circuit, and is used for charging electric energy measurement when the electric vehicle is being charged;

The power supply port is used for connecting with the electric vehicle through a charging cable.

Preferably, the rectifier module is a full-bridge rectifier circuit.

Preferably, the control box is provided with a PWM control guide device 100;

The power supply ports of each of the charging devices are connected to the PWM control guide device 100 through respective corresponding relays;

The PWM control guiding device 100 is used to monitor the interaction between each of the charging devices and the electric vehicle.

Preferably, each of the charging devices is provided with a leakage protection switch;

The leakage protection switch is connected in series in the power supply circuit, and is used to disconnect the electric vehicle from the AC power supply when the leakage current is greater than a preset leakage current.

Preferably, serial communication is performed between the controller and all electric meters in the charging equipment;

The controller is used to obtain the readings of all the electricity meters through the serial communication party.

Preferably, the controller is specifically a single chip microcomputer, a microprocessor or a programmable logic controller PLC.

Preferably, the power supply port is specifically a power supply socket.

Preferably, the charging device is further equipped with the charging cable, one end of the charging cable is provided with a power supply plug matching the power supply socket, and the other end is provided with a vehicle plug.

Preferably, a PWM control guiding device 100 is provided on the charging cable.

Preferably, the charging cable is stored in a rental cabinet;

The rental cabinet is provided with a cabinet door lock that can be controlled by a signal.

Preferably, it also includes: a main control box and a sub-control box;

The main control box includes a main controller, and the sub-control boxes include sub-controllers;

One of the main control boxes corresponds to a plurality of the sub-control boxes, and one of the sub-control boxes corresponds to a plurality of the control boxes.

Preferably, the controller is further configured to receive a charging request sent by a user terminal device, where the charging request carries the corresponding recharge balance and user registration information; according to the charging request, it is determined that the electric vehicle corresponding to the user is allowed to be charged when the electric vehicle is charged.

Preferably, the controller is further configured to determine that the electric vehicle is fully charged when the DC signal is less than a full preset value, and control the corresponding contactor to disconnect.

Preferably, the controller is further configured to receive the parking time and the pick-up time sent by the user terminal device, and arrange a corresponding charging period for the user's electric vehicle according to the parking time and the pick-up time.

Preferably, the controller is further configured to determine that when the charging period is a low power consumption period, the charging standard corresponding to the power consumption low period is deducted; the charging standard corresponding to the power consumption low period is lower than that of the power consumption low period. Charges corresponding to peak hours of electricity.

Preferably, the controller is configured to judge whether the DC signal is less than or equal to a preset current when the contactor is closed for a preset time period, and if so, confirm that the electric bicycle is charging, and control the contactor device is disconnected.

A second aspect of the present application provides a method for controlling an electric vehicle charging system, which is applied to any of the electric vehicle charging systems provided in the first aspect, including:

Receive the current on the power supply circuit detected in real time when the charging vehicle is charging;

During the preset time period when the corresponding contactor is closed, continuously determine whether the detected current is less than or equal to the preset current. If so, confirm that the charging vehicle is an electric bicycle, and send a disconnection signal to the contactor. turn on the signal.

As can be seen from the above technical solutions, the embodiments of the present application have the following advantages:

In the embodiment of the present application, an electric vehicle charging system is provided, which includes a plurality of charging subsystems and a controller, and in each charging subsystem, the contactor corresponding to the charging device is electrically connected to the controller of the control box, and also That is, the centralized control of multiple charging devices by the controller is realized. Compared with the existing charging devices that are independently set on a single pile, the cost of centralized control in the embodiment of the present application is greatly reduced, so the charging is fully covered in the parking lot. Equipment also no longer needs such a high cost, which is conducive to the popularization of electric vehicles.

In addition, in another implementation, the rectifier module adopts a full-bridge rectifier circuit, and the AC current induced by the current transformer can be converted into DC through the full-bridge rectifier circuit, so that after the controller is input, the controller can easily The effective value is converted to realize the real-time monitoring of the charging current. The use of such a current sampling circuit can further reduce costs and make it easier to implement the solution of the parking lot covering all-round charging equipment. However, if the current sampling conversion module on the market is used, the cost will be difficult to reduce.

Due to the reduction in cost, the all-round coverage of charging equipment in the parking lot has become a highly feasible solution, enabling users to charge at any parking space without having to search for the few parking spaces with charging piles as before, greatly improving the Users' confidence in electric vehicles improves the comfort of the experience.

Description of drawings

1 is a schematic structural diagram of an electric vehicle charging system according to an embodiment of the present application;

FIG. 2 is a hierarchical control topology diagram of an electric vehicle charging system provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of a control and guide circuit of a first setting mode provided by an embodiment of the present application;

4 is a schematic diagram of a control and guide circuit of a second setting mode provided by an embodiment of the present application;

5 is a schematic diagram of a control and guide circuit of a third setting mode provided by an embodiment of the present application;

6 is a flowchart of a method for controlling an electric vehicle charging system according to an embodiment of the present application;

Reference numerals: control box 1, controller 10, charging subsystem 2, contactor 21, charging equipment 22, current transformer 23, rectifier module 24, electricity meter 41, leakage protection switch 42, PWM control guide device 100, relay 200.

Detailed ways

In order to make those skilled in the art better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

In order to facilitate the use of parking spaces for electric vehicles and fuel vehicles, the charging equipment required for electric vehicle charging should be installed in as many parking spaces as possible. The first problem to be solved is how to reduce the cost of charging equipment. The embodiments of the present application provide an electric vehicle charging system that can be implemented at low cost, so that 100% coverage of the parking lot with charging equipment is no longer a cost-prohibitive solution.

1 to 5 , wherein FIG. 1 is a schematic structural diagram of an electric vehicle charging system provided by an embodiment of the present application. The charging system specifically includes a plurality of charging subsystems 2 and a control box 1 .

A controller 10 is arranged in the control box 1, and the space in the control box 1 can be used for the arrangement of the weak current connection lines.

A charging subsystem 2 includes a contactor 21 , a current transformer 23 , a rectifier module 24 matched with the current transformer 23 , and a charging device 22 . Wherein, one end of the contactor 21 is used to connect with the AC power supply, and the other end is connected to the charging device 22 through a power supply cable. When the contactor 21 is closed, the charging device 22 will form a path with the AC power source, the charging device 22 is charged, and the electric vehicle connected to the charging device 22 can be charged.

For the control of the contactors 21, the embodiment of the present application adopts a centralized control method, that is, each contactor 21 is electrically connected to the controller 10, so that one controller 10 can control the power-on conditions of multiple charging devices 22. In terms of control, compared to the existing charging equipment 22 which are set up with independent single piles, such centralized control can greatly reduce the cost of the entire charging system.

Considering that there are various situations when charging electric vehicles, it is necessary to monitor the charging current during charging. To this end, a current transformer 23 may be provided on the power supply loop, and the current transformer 23 can detect the current on the power supply loop where it is located in real time. In the specific setting, the primary side of the current transformer 23 should be set on the power supply circuit, for example, it can be set at the end of the contactor 21 connected to the AC power supply, of course, it can also be set at other positions according to the actual situation.

Since what the current transformer 23 induces is an alternating current, and the monitoring of the current is actually monitoring the effective value of the current, it is necessary to rectify the alternating current into a direct current signal. Specifically, a rectifier module 24 may be provided, and the rectifier module 24 may rectify the current detected by the current transformer 23 into a DC signal, and then send the DC signal to the controller 10 to monitor the current.

To further reduce costs, the rectifier module 24 may use a full-bridge rectifier circuit. After the AC current is rectified by the full-bridge rectifier current, it can be directly input to the analog signal input module of the controller 10, and the controller 10 can easily complete the conversion of the RMS current. By adopting such a current sampling loop, the cost can be further reduced, making it easier to realize the solution that the parking lot covers the charging equipment 22 in all directions. Compared with other current sampling conversion modules on the market, the cost is often high.

The charging device 22 specifically includes an electricity meter 41 and a power supply port. Wherein, the electric meter 41 is connected in series in the power supply circuit, and is used to measure the charging electric energy when the electric vehicle is being charged. Using the electric meter 41 to measure the degree of electric energy provides a basis for charging the electric vehicle.

The kWh measured by the electricity meter 41 needs to be sent to the controller 10, and the controller 10 calculates the corresponding charge according to the obtained kWh and performs subsequent charging steps. During specific implementation, the connection between the controller 10 and the electricity meter 41 in each charging device 22 may be realized by means of serial communication.

A leakage protection switch 42 can also be set in the charging device 22, and the leakage protection switch 42 can be connected in series in the power supply circuit to play a good leakage protection function, that is, when the leakage current is greater than the preset leakage current, the electric vehicle can be disconnected from the AC The connection of the power supply greatly improves the safety of charging. Of course, the leakage protection switch 42 can also be provided with a self-recovery insurance.

The setting of the power supply port in the charging device 22 is to facilitate the connection with the electric vehicle. When connecting specifically, a charging cable may be used to realize the connection between the charging device 22 and the electric vehicle. There are many ways to set the power supply port, and in the embodiment of the present application, the power supply port is specifically selected as a power supply socket with low cost, reliability, and easy replacement and maintenance. In a specific implementation, the power supply socket may be a 10A/16A/32A standard socket, which may be connected to a charging cable provided with a power supply plug at one end.

It should be noted that the electric vehicle charging system provided by the embodiment of the present application is mainly dedicated to providing slow charging services for electric vehicles, so the charging current requirement is not very high, and the power supply socket can be a common electrical socket that has been widely used for measuring electric energy. Reliable and low-cost household electricity meters 41 can also be used. The reason why the technical solution of the present application is aimed at slow charging is that fast charging has an adverse effect on electric vehicle batteries, which will reduce the service life of electric vehicle batteries. Moreover, fast charging has a greater impact on the power grid, and a large number of fast charging will affect the stability of the power grid. In contrast, slow charging does not have the disadvantages of the above-mentioned fast charging, but it requires a longer charging time. For this reason, the electric vehicle charging system provided by the embodiment of the present application is mainly applied to living places such as parking lots, rather than public places such as gas stations and charging stations, so as to allow users to use the long non-use The electric vehicle is charged during the driving time period (such as the rest time at night), and the impact of the long charging time on the user is minimized.

Further, the controller 10 has various options in specific implementation, for example, it can be a single chip microcomputer, a microprocessor or a programmable logic controller PLC. The implementations shown in the drawings of the embodiments of the present application use a PLC as the controller 10 .

It should be noted that the above is that one controller 10 controls multiple charging devices 22 correspondingly, but when the parking lot area is large and there are too many charging devices 22, it is easy to be confused by only a single controller 10 for control. Therefore, a more The charging device 22 is controlled by a hierarchical hierarchy. Please refer to FIG. 2. FIG. 2 is a hierarchical control topology diagram of an electric vehicle charging system according to an embodiment of the present application. In addition to the control box, a master control box can be further set, the master control box includes a master controller, and a sub-control box can be further set, and the sub-control boxes include sub-controllers. Among them, one master control box corresponds to multiple sub-control boxes, it can also be said that one master controller can correspond to multiple sub-controllers, and one sub-control box corresponds to multiple control boxes, that is to say, one sub-controller can correspond to multiple sub-controllers. a controller. Through the method of hierarchical control, the control and management of parking spaces can be made more orderly.

An example is provided below for easy understanding. For example, the parking spaces of a large parking lot can be divided into three sections, and each section can be further divided into four areas, and each area corresponds to several parking spaces; in this way, a corresponding charging system can be set The main controller of the overall control, to the next level, that is, corresponding to the three large blocks, can set corresponding sub-controllers for each large block, and then to the next level, corresponding to each area under each large block, and then separately A corresponding controller is set, and the controller corresponds to a number of parking spaces that can control the area where it is located.

It is easy to understand that the hierarchical structure set for convenient control can be adjusted more flexibly according to the actual situation. For example, when there are many parking spaces in the parking lot, a plurality of general controllers may also be set in the charging system. How the controllers are graded depends on the resources of the hardware device and the overall cost. In this embodiment, for the specific number of total controllers, the specific number of sub-controllers corresponding to each general controller, the specific number of regional controllers corresponding to each sub-controller, and the charging equipment corresponding to each regional controller The specific quantity is not limited, and can be set by those skilled in the art according to actual needs.

Signal transmission or communication is required for the interaction between the electric vehicle and the charging device 22. In order to monitor the interaction between the two, it is usually necessary to introduce a control and guidance function. The control guide function can be implemented by the PWM control guide device 100, and the PWM control guide device 100 can be set in various ways, please refer to FIG. interface and analog input negative interface. .

For example, referring to FIG. 3 , a PWM control guiding device 100 is provided on each charging device 22 , so that one PWM control guiding device 100 is responsible for the interaction between one charging device 22 and the electric vehicle. However, such an arrangement needs to be equipped with a plurality of PWM control guiding devices 100 , and the cost is relatively high.

There is another setting method, as shown in FIG. 5 , the PWM control guide device 100 is arranged in the charging cable, but this setting also requires each charging cable to be equipped with the PWM control guide device 100, and the cost is still relatively high.

To this end, the embodiment of the present application provides a preferred setting method, as shown in FIG. 4 , that is, the PWM control guide device 100 is installed in the control box 1, and the power supply ports of each charging device 22 are connected to the PWM control guide device. The device 100 is connected. Of course, a control switch is also provided between each charging device 22 and the PWM control guiding device 100 , and the control switch may be a relay 200 specifically. In this way, one PWM control guiding device 100 can correspond to a plurality of charging devices 22 , and the number of equipped PWM control guiding devices 100 can be greatly reduced, so that the overall cost of the charging system is greatly reduced.

GBT18487.1-2015 "Electric Vehicle Conductive Charging System Part 1 General Requirements" specifies four charging modes for electric vehicle charging and three connection methods (connection methods A, B and C). Among the three setting methods of the PWM control guiding device 100 provided in FIGS. 3 to 5 , the setting methods shown in FIGS. 3 and 4 are applicable to charging mode 3 , and the setting method shown in FIG. For those skilled in the art, the basic meanings and features of the charging mode 2 and the charging mode 3 can be obtained from relevant documents, and details are not repeated here.

The working principle of the PWM control guiding device 100 in this embodiment is applicable to the connection mode B and the connection mode C in the national standard. Wherein, it can be judged whether the vehicle plug and the vehicle socket are completely connected by monitoring the resistance value between PE and CC. Among them, S3 is a normally closed switch. When not connected, switch S3 is closed, CC is not connected, and the resistance value between PE and CC is infinite. When half-connected, S3 is disconnected and CC is connected. At this time, the resistance value between PE and CC is R4+RC. When fully connected, S3 is closed, CC is connected, and the resistance value between PE and CC is RC.

A charging cable can also be provided for the charging device 22. The provided charging cable should have a power supply plug that matches the power supply socket provided on the charging device 22, and the other end of the charging cable should be provided with a vehicle plug connected to the electric vehicle. Of course, the vehicle plug can be set according to Models of electric vehicles that allow charging can choose different specifications themselves.

In the matching scheme of the charging cable, one charging device 22 can be matched with one charging cable, or several nearby charging devices 22 can be matched with one charging cable. have to be aware of is,. The charging cable can be rented and stored in the rental cabinet. The rental cabinet is provided with a cabinet door lock that can be opened or locked by signal control. If the user needs to rent the charging cable, he can apply through the mobile terminal. After the verification is passed, he can remotely control the rental cabinet to open the cabinet door. The matching of the charging cable makes it unnecessary for the user to prepare a charging cable for each charging, which provides convenience for the user.

It can be understood that if the vehicle being charged by the charging device is an electric vehicle, the charging current will be small at the initial stage of charging, and then gradually increase. When the battery is gradually fully charged, the charging current will decrease again. small process. For example, after the JAC IEV5 is fully charged, the working current is about 0.09A; after the NIO car is fully charged, the current reaches about 0.4A.

In the charging system provided by the embodiment of the present application, the controller 10 can also be configured to: when it is determined that the DC signal is less than the full preset value, determine that the electric vehicle is fully charged, and control the corresponding contactor to be disconnected.

As an example, the preset value may be set to 1A, that is, when the DC signal is less than 1A, it is determined that the electric vehicle being charged has been charged, and it is not necessary to supply power to the electric vehicle. Therefore, at this time, the controller 10 can control the contactor 21 corresponding to the charging device 22 connected to the electric vehicle to be disconnected.

In practical applications, the vehicle information of each electric vehicle that needs to be charged in the parking lot can be collected in advance, so as to determine the current when the electric vehicle is fully charged. A slightly larger current value can be designed as a preset value according to the current when different electric vehicles are fully charged. Of course, preset values can also be set according to different electric vehicles, so that the controller 10 can determine whether the vehicle is fully charged.

In the electric vehicle charging system provided by the embodiment of the present application, the controller 10 can also meet many personalized demands of the user for parking charging or provide the user with a more economical charging arrangement through communication and interaction with the user terminal.

As a possible implementation manner, the controller 10 can also be used to receive a charging request sent by the user terminal device, and the sent charging request carries the corresponding charging balance and user registration information; according to the charging request, it is determined that the electric vehicle corresponding to the user is allowed to be charged when the electric vehicle is charged.

Understandably, in some car parks, parking spaces are only available to certain users. For example, in a residential parking lot, only residential residents are allowed to park their electric vehicles in the parking spaces for charging. Therefore, according to the user registration information carried in the charging request, the controller 10 can know whether the user who sends the charging request through the mobile terminal is a cell resident.

It can be understood that if the user's recharge balance is too low, it is difficult to ensure that the remaining balance can pay for the charge of the charging order, and therefore, the charging request with insufficient recharge balance is not permitted.

It can be seen that only the charging request in which the recharge balance is sufficient in the charging request and the user registration information meets the requirements is the charging request that meets the charging requirements. The user who sent the request correspondingly allows the electric vehicle to be charged. At this time, the controller 10 can control the charging device in the parking space where the vehicle is located to charge the electric vehicle.

It can be understood that, in practical applications, the power consumption period can be divided into a power consumption valley period and a power consumption peak period. During the period of low electricity consumption, the demand for electricity is small and the electricity bill is lower; during the peak period of electricity consumption, the demand for electricity is large and the electricity bill is higher. The user can send the parking time and the pickup time to the controller 10 through the mobile terminal. The controller 10 may also be configured to receive the parking time and the pick-up time sent by the user terminal device, and arrange a corresponding charging period for the user's electric vehicle according to the parking time and the pick-up time.

For example, the trough period of electricity consumption in a certain city is from 00:00 in the morning to 07:00 in the morning. The parking time for users is 22:00 in the evening, and the pick-up time is 9:00 the next morning. Obviously, if charging starts at 22:00 in the evening, the charging period coincides with the peak period of electricity consumption, resulting in an increase in charging costs for users. To this end, the controller 10 can arrange for the electric vehicle to be charged from 00:00 in the morning according to the parking time and the pickup time. If the vehicle can be fully charged within 5 hours, the user only needs to pay the electricity bill for 5 hours during the low electricity consumption period, and if charging starts at 22:00 in the evening, after 5 hours of full electricity, the user needs to pay for the electricity consumption peak. The electricity bill for 2 hours during the period and the electricity bill for 3 hours during the low electricity consumption period. That is, the controller 10 is further configured to deduct the charge according to the charging standard corresponding to the low power consumption period when the charging period is determined to be the low power consumption period. It can be seen that the charging system provided by the embodiment of the present application can improve the economy of charging users with charging equipment by arranging charging time periods, and promote the use and promotion of charging equipment; They are all charged during the peak period of electricity consumption, and the transformer will be difficult to meet the requirements. Therefore, in the embodiment of the present application, the charging time of different electric vehicles is arranged in different time periods, and the maximum utilization of the transformer capacity is realized, which is quite In order to provide charging services for more users.

The controller 10 can also be used to determine whether the DC signal is less than or equal to the preset current when the contactor 21 is closed for a preset period of time, and if so, confirm that the electric bicycle is being charged, and control the contactor to be disconnected.

As an example, assuming that the preset time period is 45 seconds and the preset current is 2A, the timing starts from the moment the contactor 31 is closed, and when the timing is 45 seconds, it is determined whether the DC signal is less than or equal to 2A. In practical applications, if the vehicle being charged is an electric vehicle, the DC signal collected in 45 seconds under normal conditions can reach more than 2A; but if the vehicle being charged is an electric bicycle, it will not reach the level of 45 seconds in the timing. 2A and above. Therefore, according to the different currents corresponding to the specific characteristics of the electric vehicle and the electric bicycle during charging, it can be determined whether the object to be charged is an electric bicycle or an electric vehicle by setting a preset time period and a preset current. It can be seen that the charging system provided by the present application can timely determine the type of vehicle to be charged during the use of the charging device, so that the charging device can be prohibited from charging the electric bicycle as soon as possible in the initial stage of charging, so as to avoid charging accidents, thereby preventing the occurrence of charging accidents. Ensure the safe use of charging equipment.

Of course, in practical applications, the preset time period and the preset current can be specifically set according to the standard of the charging plug of the charging device 22, the model information of the electric vehicle, and the battery parameters of the electric vehicle. Therefore, the specific values of the preset time period and the preset current are not limited in this embodiment.

It can be seen from the foregoing description that the electric vehicle charging system provided by the embodiment of the present application includes a plurality of charging subsystems and a controller, and in each charging subsystem, the contactor corresponding to the charging device is electrically connected to the controller of the control box, That is, centralized control of multiple charging devices by the controller is realized. Compared with the existing charging devices that are independently set on a single pile, the cost of centralized control in the embodiment of the present application is greatly reduced. In addition, in the real-time current detection, the current sampling method in which the current transformer and the full-bridge rectifier circuit cooperate is adopted, which further reduces the cost of current sampling; Among them, the electric meter, contactor, power supply socket, etc. do not need to withstand the high current required by fast charging, so the selection of electrical components can be used with very mature common components, and these components are not only durable and hard to break, even if they are broken. Replacement and maintenance costs are also very low.

Therefore, the embodiments of the present application provide an electric vehicle charging system that, through clever design and advanced concepts, can effectively and safely realize the charging of electric vehicles at a very low cost, so that charging equipment (such as charging piles) can be covered in a large area or even 100%. The feasibility of the parking lot is very high. Once it is popularized and used, it can provide convenience for the charging of users' electric vehicles, and also greatly help the promotion of electric vehicles. Moreover, when the parking spaces are equipped with charging piles, users are more able to accept the charging method of slow charging, and gradually form a charging habit that is more friendly to the battery of electric vehicles.

Based on the various implementation manners of the electric vehicle charging system provided above, correspondingly, the present application also provides a control method for an electric vehicle charging system.

Referring to FIG. 6 , which is a flowchart of a method for controlling an electric vehicle charging system according to an embodiment of the present application. The method is applied to any of the electric vehicle charging systems provided in the foregoing embodiments.

As shown in Figure 6, the electric vehicle charging system control method includes:

Step 601: Receive the current on the power supply circuit detected in real time when the charging vehicle is charging.

Step 602 : within the preset time period when the corresponding contactor is closed, continuously determine whether the detected current is less than or equal to the preset current, and if so, go to step 603 .

Step 603: Confirm that the charging vehicle is an electric bicycle, and send a disconnection signal to the contactor.

In the electric vehicle charging system control method provided by the present application, the controller continuously judges whether the detected current is less than or equal to the preset current within the preset time period when the corresponding contactor is closed, and if so, confirms that the charging vehicle is an electric vehicle Therefore, in order to avoid a fire accident, the controller sends a disconnection signal to the contactor to disconnect the contactor and stop charging the electric bicycle. It can be seen that the electric vehicle charging system control method provided by the present application can timely determine the type of the charging vehicle during the use of the charging device, and ensure the safe use of the charging device.

It should be understood that, in this application, "at least one (item)" refers to one or more, and "a plurality" refers to two or more. "And/or" is used to describe the relationship between related objects, indicating that there can be three kinds of relationships, for example, "A and/or B" can mean: only A, only B, and both A and B exist , where A and B can be singular or plural. The character "/" generally indicates that the related objects are an "or" relationship. "At least one item(s) below" or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (a) of a, b or c, can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c" ", where a, b, c can be single or multiple.

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: The technical solutions described in the embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions in the embodiments of the present application.

Claims (11)

1. An electric vehicle charging system, comprising: a plurality of charging subsystems and a control box; A controller is arranged in the control box; Each of the charging subsystems includes: a contactor, a charging device, a current transformer and a rectifier module; One end of the contactor is used to connect with the AC power supply, and the other end is connected to the charging device through a power supply cable; each of the contactors is electrically connected to the controller, and the controller is used when the electric vehicle needs to be charged , control the corresponding contactor to close; The current transformer is used to detect the current on the corresponding power supply circuit in real time, and send the detected current to the rectifier module; the rectification module, configured to rectify the current detected by the current transformer into a DC signal, and send the DC signal to the controller; The charging device includes: an electricity meter and a power supply port; The electric meter is connected in series in the power supply circuit, and is used for charging electric energy measurement when the electric vehicle is being charged; the power supply port is used for connecting with the electric vehicle through a charging cable; The controller is further configured to receive the parking time and the pick-up time sent by the user terminal device, and arrange a corresponding charging period for the user's electric vehicle according to the parking time and the pick-up time; The controller is further configured to determine whether the charging period has an overlapping period that overlaps with the power consumption trough period, and if so, arrange the user's electric vehicle to be charged in the period including the overlapping period, and for the overlapping period according to the following: The charging standard corresponding to the electricity trough period is deducted; the charging standard corresponding to the electricity trough period is lower than the charging standard corresponding to the electricity consumption peak period, and the electricity trough period is from 00:00 to 07:00; The controller is further configured to receive a charging request sent by the user terminal equipment, where the charging request carries the corresponding recharge balance and user registration information; when it is determined according to the charging request that the electric vehicle corresponding to the user is allowed to be charged, then charging the electric vehicle; The controller is further configured to determine a full-charge preset value according to the type of the electric vehicle, and when the DC signal is less than the full-charge preset value, determine that the electric vehicle is fully charged, and control the corresponding contact disconnect; The controller is further configured to judge whether the DC signal is less than or equal to the preset current when the contactor is closed for a preset time period, and if so, confirm that the electric bicycle is charging, and control the contactor to open. On, the preset current is 2A; The control box is provided with a PWM control guide device for monitoring the interaction between each of the charging equipment and the electric vehicle, the power supply ports of each of the charging equipment are connected to the PWM control guide device, and each of the charging equipment is connected to the PWM control guide device. A relay is arranged between the charging device and the PWM control guiding device. 2 . The electric vehicle charging system according to claim 1 , wherein the rectifier module is a full-bridge rectifier circuit. 3 . 3. The electric vehicle charging system according to claim 1, wherein a leakage protection switch is provided in each of the charging devices; The leakage protection switch is connected in series in the power supply circuit, and is used for disconnecting the electric vehicle from the AC power supply when the leakage current is greater than a preset leakage current. 4. The electric vehicle charging system according to claim 1, wherein serial communication is performed between the controller and all electric meters in the charging equipment; The controller is used to obtain the readings of all the electricity meters through the serial communication party. 5 . The electric vehicle charging system according to claim 1 , wherein the controller is a single chip microcomputer, a microprocessor or a programmable logic controller (PLC). 6 . 6. The electric vehicle charging system according to claim 1, wherein the power supply port is specifically a power supply socket. 7 . The electric vehicle charging system according to claim 6 , wherein the charging device is further equipped with the charging cable, one end of the charging cable is provided with a power supply plug matching the power supply socket, and the other end is provided with a power supply plug matching the power supply socket. 8 . There is a vehicle plug. 8 . The electric vehicle charging system according to claim 7 , wherein a PWM control guiding device is provided on the charging cable. 9 . 9. The electric vehicle charging system according to claim 7, wherein the charging cable is stored in a rental cabinet; The rental cabinet is provided with a cabinet door lock that can be controlled by a signal. 10. The electric vehicle charging system according to claim 1, further comprising: a general control box and a sub-control box; The main control box includes a main controller, and the sub-control boxes include sub-controllers; One of the main control boxes corresponds to a plurality of the sub-control boxes, and one of the sub-control boxes corresponds to a plurality of the control boxes. 11. A control method for an electric vehicle charging system, characterized in that, applied to the electric vehicle charging system according to any one of claims 1-10, comprising: Receive the current on the power supply circuit detected in real time when the charging vehicle is charging; During the preset time period when the corresponding contactor is closed, continuously determine whether the detected current is less than or equal to the preset current. If so, confirm that the charging vehicle is an electric bicycle, and send a disconnection signal to the contactor. turn on the signal.

Images