CN205595816U - Can be many machines that charge that electric automobile charges simultaneously - Google Patents

Abstract

The utility model relates to a charger capable of charging multiple electric vehicles at the same time, comprising several power conversion modules for converting alternating current into direct current, the power conversion modules are divided into at least two groups, and each group of power conversion modules is connected to a DC bus In one-to-one correspondence, the output terminals of each group of power conversion modules are connected to the corresponding DC bus, and the output of each DC bus is connected to at least two charging lines for charging the electric vehicle. The charger can meet the simultaneous charging of multiple electric vehicles by setting multiple charging lines, which is convenient for users to charge; each group of power conversion modules corresponds to a DC bus, and the DC buses work independently without mutual interference. If some of the DC buses or If the power conversion module fails, the faulty bus bar or module is cut off, and the remaining DC bus bars or power conversion modules can still work normally without interference, which improves the reliability and flexibility of the charger.

Description

A charger capable of simultaneously charging multiple electric vehicles

technical field

The utility model relates to the field of electric vehicle charging, in particular to a charger capable of simultaneously charging multiple electric vehicles.

Background technique

With the gradual emergence of the petrochemical crisis and the increasingly severe environmental pollution problems, electric vehicles have attracted more and more attention from the society because of their superior environmental performance and economical operating costs. In recent years, with the breakthrough of power battery grouping and related technical problems, the market demand for electric vehicles has continued to increase, and the promotion and popularization of electric vehicles is being put on the agenda by governments of various countries. The rational layout and construction of electric vehicle charging facilities, especially fast chargers, is the basis for the popularization of electric vehicles.

Precious and scarce land resources require electric vehicle fast chargers to have as small an area as possible and high power density; economical operating costs and comfortable operating experience require chargers to have high stability, ease of operation, and flexibility Intelligent and other features.

At present, the charging capacity of electric vehicle chargers at home and abroad is limited. Generally, one charger can only charge one or two electric vehicles. In a limited charging site, only a small number of vehicles can enjoy charging services, which cannot effectively use the site space.

In addition, both ordinary private car users and public electric car companies are more inclined to charge at night. The existing charger can only wait for one car to be fully charged and then manually switch to another car for charging. Cars are charged automatically and orderly, so ordinary users can only "seize the opportunity" when charging at night, which brings great obstacles to users' normal charging.

In order to effectively improve the service efficiency of a single charger and avoid the disadvantage that one charger can only charge one or two electric vehicles at the same time, it is necessary to invent an integrated intelligent charging system that can simultaneously charge multiple electric vehicles in an orderly manner machine.

Utility model content

The purpose of the utility model is to provide a charger capable of charging multiple electric vehicles at the same time, so as to solve the problem that a conventional charger can only charge one or two electric vehicles at the same time.

In order to achieve the above object, the solution of the utility model includes a charger capable of charging multiple electric vehicles at the same time, including several power conversion modules for converting alternating current into direct current, and the power conversion modules are divided into at least two groups, each The groups of power conversion modules are in one-to-one correspondence with the DC busbars, the output terminals of each group of power conversion modules are connected to the corresponding DC busbars, and the output of each DC busbar is connected to at least two charging lines for charging electric vehicles.

The DC busbars are connected in series through busbar connection switches.

The AC input line is connected to the input terminals of all the power conversion modules, and a lightning arrester is connected to the AC input line.

For each group of power conversion modules, all power conversion modules are connected by communication.

The charger includes a control device, and the control device controls the connection of the bus connection switch.

Each of the DC buses corresponds to a number of charging lines for charging electric vehicles shown in the output connection of a DC output line, and each of the DC output lines is provided with a metering and billing module, and the metering and billing module It includes a voltage collection terminal for collecting the voltage on the direct current output line and a current collection terminal for collecting the current on the direct current output line, and the control device is connected to the metering and billing module for sampling.

The charger also includes a temperature control device, which is set corresponding to the power conversion module and is used to control the temperature of the power conversion module. The temperature control device includes a temperature sensor and a fan, and the control device is connected to a sample The temperature sensor is connected to the fan for control.

The interior of the charger is provided with a humidity control device, the humidity control device includes a humidity sensor and a heating resistor, the control device samples and connects the humidity sensor, and controls the connection with the heating resistor.

The charger further includes a station communication module and a remote service platform communication module, and the control device communicates with the station communication module and the remote service platform communication module.

The charger includes a human-computer interaction unit, the human-computer interaction unit includes a card reader and a liquid crystal display, and the control device is connected to the liquid crystal display and to the card reader for sampling.

The charger can meet the simultaneous charging of multiple electric vehicles by setting multiple charging lines, which is convenient for users to charge; moreover, in order to prevent the power conversion module from using only one power conversion module and bring a large degree of work burden, the The charger is equipped with multiple power charging modules, and each power conversion module bears part of the working pressure, so the workload of each module is reduced and its service life is increased; the power conversion modules are divided into at least two groups, each group of power conversion The module corresponds to a DC bus, and the DC buses work independently without interfering with each other. If some of the DC buses or power conversion modules fail, the faulty bus or modules are cut off, and the rest of the DC buses or power conversion modules can still work normally. Interference improves the reliability and flexibility of the charger.

Description of drawings

Fig. 1 is the hardware structural diagram of this charger;

Fig. 2 is the interface and peripheral circuit diagram of the control device;

Figure 3 is the working flow chart of the charger.

detailed description

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Example 1

As shown in Figure 1, it is a hardware structure diagram of a charger capable of simultaneously charging multiple electric vehicles provided by the utility model. The charger includes several power conversion modules for converting AC power into DC power. Divide all the power conversion modules into several groups, specifically at least two groups, each group of power conversion modules corresponds to the DC bus, and the output terminals of each group of power conversion modules are connected to the corresponding DC bus, and each DC The bus output is connected to several charging lines for charging electric vehicles.

As a specific embodiment, in this embodiment, there are 8 power conversion modules in total, which are divided into two groups, and each group has 4 power conversion modules. Of course, there may be other numbers of power conversion modules, or they may be divided into more groups, and the working principle and process thereof are the same as those in this embodiment.

In this embodiment, the 8 power conversion modules: EM1-EM8 are divided into two groups, the first group includes 4 power conversion modules: EM1-EM4, and the second group includes 4 power conversion modules: EM5-EM8. The input ends of these eight power conversion modules are all connected to the AC input line, and the AC controlled switch KM and the AC breaking switch QF are arranged in series on the AC input line. The control coil KMX of the AC controlled switch KM is connected in series with the normally closed contact SA of the emergency stop button and the normally open contact K0 of the AC power-on control relay. When the charger issues an AC power-on command, K0 is closed, KMX is powered on, the KM main contact is closed, and the AC circuit is powered on; when an emergency causes the emergency stop button to be pressed, KMX is powered off, and the KM main contact is broken open, the AC circuit is de-energized. The series circuit of SA, K0 and KMX control coils constitutes an abnormal response processing unit, which can well control the on-off of the AC main circuit, laying a technical foundation for the controllability and safety of charging.

In addition, in order to increase the safety of the AC input, a lightning protector FC is installed on the AC input line.

In order to facilitate the input and disconnection of the power conversion modules, switches: QU1-QU8 are connected in series between the input end of each power conversion module and the AC input line.

In the first group of power conversion modules, EM1-EM4 are connected by communication, and are connected through current equalizing lines for current equalization. In the second group of power conversion modules, EM5-EM8 are connected by communication, and are connected through current equalizing lines for current equalization.

The DC output terminals of the first group of power conversion modules EM1-EM4 are respectively connected to the first positive bus L1+ and the first negative bus L1-; the DC output terminals of the second group of power conversion modules EM5-EM8 are respectively connected to the second On the positive bus L2+ and the second negative bus L2-. L1+ and L2+ constitute a positive busbar, L1- and L2- constitute a negative busbar, L1+ and L2+ are connected through a DC controlled switch KM1, and L1- and L2- are connected through a DC controlled switch KM2. The control coil of KM1 is connected in series with switch K1, and the control coil of KM2 is connected in series with switch K2. By closing K1 and K2, two DC bus connections can be realized.

Connect two charging lines from the first positive bus L1+ and the first negative bus L1-: A charging line and B charging line, one end of A charging line is connected with charging connector (charging gun) CH1, one end of B charging line The charging connector CH2 is connected. A charging circuit is equipped with a charging controlled switch KMA in series, and the control coil of KMA is connected in series with the charging switch KA2. When the charging switch KA2 is closed, the control coil of KMA is powered, and the charging controlled switch KMA is closed, and then the charging connector CH1 is charged; the B charging line is equipped with a charging controlled switch KMB in series, and the control coil of KMB is connected in series with the charging switch KB2. When the charging switch KB2 is closed, the control coil of KMB is powered, and the charging controlled switch KMB is closed, and then Use the charging connector CH2 to charge. In addition, the charging interface A of the charging connector CH1 is provided with a charging indicator light LA1 and a charging stop indicator light LA2, and the charging interface B of the charging connector CH2 is provided with a charging indicator light LB1 and a charging stop indicator light LB2.

Two charging lines are connected to the output from the second positive bus L2+ and the second negative bus L2-: C charging line and D charging line, one end of the C charging line is connected to the charging connector CH3, and one end of the D charging line is connected to the charging connection Its device CH4. C The charging line is provided with a charging controlled switch KMC in series, the control coil of KMC is connected in series with the charging switch KC2, when the charging switch KC2 is closed, the control coil of KMC is powered, the charging controlled switch KMC is closed, and then the charging connector is used CH3 is charged; the D charging line is equipped with a charging controlled switch KMD in series, and the control coil of KMD is connected in series with the charging switch KD2. When the charging switch KD2 is closed, the control coil of KMD is powered, and the charging controlled switch KMD is closed, and then Use the charging connector CH4 to charge. In addition, the charging interface C of the charging connector CH3 is provided with a charging indicator LC1 and a charging stop indicator LC2 , and the charging interface D of the charging connector CH4 is provided with a charging indicator LD1 and a charging stop indicator LD2 .

In addition, each charging line is equipped with a fuse, and the charging connectors CH1, CH2, CH3, and CH4 are all equipped with electromagnetic locks. During the charging process, the electromagnetic locks lock the charging connectors and cannot be plugged in; Unlocked, the charging connector can be pulled out and put back in place.

Example 2

In the above-mentioned embodiment 1, the charging machine is manually operated, and the charging is performed by human operation. However, on the basis of the first embodiment above, the charger provided by this embodiment further includes a control device, and corresponding charging control is performed by using a related software program in the control device.

The control device is the control core and information processing core of the charger. In order to share the total workload, the control device consists of two control boards: M1 and M2, as shown in Figure 2, where M1 is the master control board and M2 is the slave control board. M1 issues the following on-off commands for the controlled switches: AC power-on control relay K0, DC controlled switch control relays KA2, KB2, charging indicators LA1, LB1 for charging ports A and B, stop indicators LA2, LB2, DC controlled switching relay K1 and relay K2. M1 collects AC input switch status signal, lightning protection device alarm status signal, emergency stop status signal, DC controlled switch status signal between groups, DC output CH1, CH2 controlled switch status signal, charging interface A request stop signal and indicator light, Charging interface B request and stop signal.

M2 issues the following on-off commands for the controlled switches: DC controlled switch control relays KC2, KD2, charging indicators LC1, LD1 for charging interfaces C and D, and stop indicator lights LC2, LD2 for charging interfaces C and D. M2 collects DC output CH3, CH4 controlled switch status signals, charging interface C request stop signal and indicator light, charging interface D request and stop signal.

In addition, in order to exchange information between the two control boards, RS485 or CAN communication is performed between M1 and M2.

As shown in Figure 1, the first positive bus L1+ and the first negative bus L1- are connected to the charging lines A and B through a DC output line, and a metering and billing module AIP1 is set on the DC output line. The module includes a voltage acquisition terminal for collecting the voltage on the DC output line and a current acquisition terminal for collecting the current on the DC output line. The metering and billing module adopts a DC metering watt-hour meter, and the DC watt-hour meter collects and charges in real time. Voltage, current, and energy data, and send the information to the main control board M1 through RS485 communication.

The second positive bus L2+ and the second negative bus L2- are connected to the charging lines C and D through a DC output line, and a metering and billing module AIP2 is arranged on the DC output line. The voltage collection terminal for the voltage on the DC output line and the current collection terminal for collecting the current on the DC output line. Degree data, and send the information to the main control board M1 through RS485 communication.

Since the power conversion module will generate a certain amount of heat during operation, and the working efficiency of the power conversion module will be affected if the temperature is too high, so the charger is provided with a temperature control device. The temperature control device is set corresponding to the power conversion module. According to the strictness of the temperature requirements, it can be divided into the following three settings: The first type: the charger is only equipped with a temperature control device, which is used to control all power conversions. The temperature of the module; the second type: a group of power conversion modules corresponds to a temperature control device, so the charger is equipped with 2 temperature control devices; the third type: a power conversion module corresponds to a temperature control device, it will need 8 temperature control device.

The temperature control device includes a temperature sensor and a fan. The main control board M1 is connected to the temperature sensor for sampling, and the control is connected to the fan. The fan used by the charger is a centrifugal fan, which is integrated and installed in a uniquely designed air duct to ensure good heat dissipation of the power module. In addition, the charger is installed inside the charging pile. In the first and second cases above, the temperature sensor does not detect the temperature of a module. Since the main heating element of the charger is the power conversion module, the temperature sensor can Detect the ambient temperature inside the charger. When the ambient temperature is greater than a certain value, the main control board M1 controls the fan to rotate accordingly to reduce the internal ambient temperature. Correspondingly, the temperature of the power conversion module will also decrease. In the third case above, the temperature sensor detects the temperature of a module in one-to-one correspondence, and at this time the temperature sensor can be fixedly installed with the power conversion module. The temperature sensor and the blower are used together to keep the inside of the charger in a constant temperature state.

In order to control the humidity inside the charger and prevent excessive humidity, a humidity control device is provided inside the charger. The humidity control device includes a humidity sensor and a heating resistor. The main control board M1 samples and connects the humidity sensor, and controls the connection to the heating resistor. The humidity sensor detects the internal humidity, and transmits the collected humidity information to the main control board M1. The main control board M1 judges. When the internal humidity is greater than the required value, the main control board M1 starts the heating resistor, and the heat emitted by the heating resistor Control the internal humidity in a safe range. The humidity sensor and the heating resistor are used together to prevent the internal humidity of the charger from being too high.

In order to facilitate the charging operation, the charger is provided with a human-computer interaction system, and the human-computer interaction system is communicatively connected with the main control board M1. The system is composed of keyboard, button, indicator light, card reader and liquid crystal display and other original components to form a hardware circuit. Through the card reader to read the card, the user can carry out operations such as identity recognition and billing inquiry of the charging service; through the cooperation of the liquid crystal display, the charging button and the indicator light, the user can choose different charging modes for matching services, and the liquid crystal display panel also displays Identification information of the user's charging card and real-time charging information.

In order to upload the equipment operation information of the charger and the charging information of the user, the charger also includes two background communication modules: a station communication module and a remote service platform communication module, and the main control board M1 communicates with these two background communication modules. The station communication module is responsible for the interaction of charger real-time charging status, metering and billing status, historical records, transaction data, on-site security and other information; the remote service platform communication module collects shared information such as the geographical location, working status, and charging price of the charger, In this way, it provides centralized monitoring and scheduling data support for operating companies, and provides general public users with services such as information query and charging appointment.

The charger has the following two charging working modes: orderly charging of vehicles and simultaneous charging of vehicles.

Specifically as shown in Figure 3, first, the user removes the charging gun from the charger and inserts it into the charging port of the electric vehicle, and presses the charging request button, the control board M1 and/or M2 detects the charging request signal, and lights up the corresponding charging request indicator light (LA1/LB1/LC1/LD1); then, the user swipes the card or enters the key to log in to the man-machine interface, and the charger will prompt the user to select the charging method (simultaneous charging or orderly charging).

The control board will enter the corresponding working mode according to the charging mode selected by the user (simultaneous charging, orderly charging) combined with the number of detected charging requests and the charging connection confirmation signal.

Orderly charging mode of vehicles: the control board arranges in sequence according to the detected time of the charging request signal of the vehicle, and the control board only arranges the "valid request", and the condition of "valid request" is that the "charging request button" of the same charging interface is pressed "down" and "charging connection confirmation signal on" are available at the same time; if one of the two is missing, it will be regarded as "invalid request", and "invalid request" will not be sorted. For example, plugging in the charging gun of an electric vehicle but not pressing the charging request button, pressing the charging request but not plugging the charging gun into the electric vehicle are all “invalid requests”. "Valid request" and "invalid request" are conditionally convertible. Under the "valid request" condition, once the charging stop button of the charging interface is pressed or the charging gun is pulled out from the electric vehicle, it will be converted into an "invalid request". The charging interface in the "valid request" state cannot accept charging requests again, and the charging interface in the "invalid request" state can accept charging requests for charging. For example, if a vehicle that was waiting to be charged in the sequence pulls out the charging gun halfway, then the charging interface can still arrange charging for subsequent vehicles.

Simultaneous vehicle charging mode: According to the number N (N=1, 2, 3, 4) of "effective requests" detected by the control board, each group of power conversion modules outputs power for their corresponding charging connection circuits. For example, the number of "valid requests" is 3, that is, there are 3 vehicles connected to the charger system, and the "charging request" button is pressed. At this time, the charger will charge 3 electric vehicles independently at the same time.

The emergency shutdown process of the charger: press the emergency stop button SA, the AC contactor coil KMX connected in series loses power, the main contact of the AC contactor is disconnected, and the input power of the main circuit is disconnected. When an emergency occurs, this design can quickly and effectively control the expansion of the accident, ensure personal safety and minimize the scope of the accident.

In the above two embodiments, since the power conversion modules are divided into two groups, there are two DC buses: the first positive bus L1+ and the first negative bus L1-, the second positive bus L2+ and the second negative bus L2 -, the two busbars are connected through a switch. As another embodiment, when the power conversion modules are divided into more groups, there are correspondingly more busbars. Each group of power conversion modules corresponds to the DC busbars one by one. All The busbars of the busbars are connected into a series circuit through switches, and the charging lines connected to the output of each busbar are not limited to two, and more charging lines can also be set according to specific conditions.

Specific implementations have been given above, but the utility model is not limited to the described implementations. The basic idea of the utility model lies in the above-mentioned basic scheme. For those of ordinary skill in the art, according to the teaching of the utility model, it does not need to spend creative labor to design various deformation models, formulas and parameters. Changes, modifications, replacements and modifications to the embodiments without departing from the principle and spirit of the utility model still fall within the protection scope of the utility model.

Claims (10)

1. A charger capable of charging multiple electric vehicles at the same time is characterized in that it includes several power conversion modules for converting alternating current into direct current, and the power conversion modules are divided into at least two groups, and each group of power conversion modules and The DC busbars are in one-to-one correspondence, and the output terminals of each group of power conversion modules are connected to the corresponding DC busbars, and the output of each DC busbar is connected to at least two charging lines for charging electric vehicles. 2. The charger capable of charging multiple electric vehicles at the same time according to claim 1, characterized in that the DC busbars are connected in series through a busbar connection switch. 3. The charger capable of charging multiple electric vehicles at the same time according to claim 1, wherein the AC input line is connected to the input terminals of all power conversion modules, and a lightning arrester is connected to the AC input line. 4. The charger capable of charging multiple electric vehicles at the same time according to claim 1, characterized in that, for each group of power conversion modules, all the power conversion modules are connected by communication. 5 . The charger capable of simultaneously charging multiple electric vehicles according to claim 2 , wherein the charger comprises a control device, and the control device controls the connection of the bus connection switch. 6. The charger capable of charging multiple electric vehicles at the same time according to claim 5, characterized in that each of the DC busbars corresponds to a plurality of DC busbars for charging the electric vehicles shown in the output connection through a DC output line. Charging lines, each of the DC output lines is provided with a metering and billing module, and the metering and billing module includes a voltage acquisition terminal for collecting the voltage on the DC output line and a voltage acquisition terminal for collecting the voltage of the DC output line The current collection terminal of the current on the control device is connected to the metering and billing module for sampling. 7. The charger capable of charging multiple electric vehicles at the same time according to claim 5, characterized in that, the charger further comprises a temperature control device, the temperature control device is set corresponding to the power conversion module, and is used to For controlling the temperature of the power conversion module, the temperature control device includes a temperature sensor and a fan, the control device is connected to the temperature sensor for sampling, and is connected to the fan for control. 8. The charger capable of charging multiple electric vehicles at the same time according to claim 5, wherein a humidity control device is arranged inside the charger, and the humidity control device includes a humidity sensor and a heating resistor, so that The control device samples and connects the humidity sensor, and controls the connection of the heating resistor. 9. The charger capable of charging multiple electric vehicles at the same time according to claim 5, characterized in that, the charger also includes a station communication module and a remote service platform communication module, and the control device communicates with the Station communication module and remote service platform communication module. 10. The charger capable of charging multiple electric vehicles simultaneously according to claim 5, characterized in that the charger comprises a human-computer interaction unit, which comprises a card reader and a liquid crystal display, so The control device is connected to the liquid crystal display and the sampling device is connected to the card reader.