Controller for electric vehicle charging system

[0011] The device provided by the present invention will be further described below in conjunction with the accompanying drawings.

[0012] As shown in Figure 1, the control device of the electric vehicle charging system provided by the present invention includes a connecting plug (not shown), a power supply (not shown), and a control signal output terminal 5. The connecting plug includes two parts, two parts The control signal output terminal 5 is electrically connected to the positive pole of the power supply, wherein the first part of the connecting plug includes a magnet 1, and the second part includes a magnetic induction switch 2. When the magnetic induction switch 2 is closed, it forms with the power supply Loop.

[0013] Wherein, the magnet 1 can be any shape and any kind of magnet, preferably a permanent magnet.

[0014] The magnetic induction switch 2 can be any magnetic induction switch, preferably an embedded magnetic induction switch. When the magnet 1 approaches the magnetic induction switch 2, the magnetic induction switch 2 is electrocuted under the action of the magnetic field, and the current provided by the power supply passes through the magnetic induction switch 2, and the magnetic induction switch 2 and the power supply form a closed loop.

[0015] The connecting plug can be of any shape, and the material is any insulating material, such as one or more of insulating rubber, plastic, and resin. It is wrapped around the magnet 1 and the magnetic induction switch 2 to avoid electrical conduction during use. Among them, the first part including the magnet 1 is the charger end of the connection plug, and the second part including the magnetic induction switch 2 is the electric vehicle end of the connection plug. The connection plug also includes a charging interface. When the connection plug is inserted, the magnetic induction switch 2 is connected to the electric vehicle end. The switch 2 is closed and sends a control signal, which means that the connecting plug is plugged in and charging can be performed. The charging interface is well-known to those in the art and does not belong to the main content of the present invention, and will not be described here.

[0016] The movable plug-in manner between the two parts of the connecting plug is any plug-in manner known to those skilled in the art, and may be a direct contact type, an electromagnetic wave induction type, and the like.

[0017] The power supply is a DC power supply, which can be a separate additional power supply for the control device, or it can be and preferably is the battery of an electric vehicle, as shown in Figure 1, where Vcc is the positive electrode of the battery of the electric vehicle, and the voltage is 12 volts. Vss is ground.

[0018] The control signal output terminal 5 can be any conductive wire, which is electrically connected to the positive electrode of the power source, and the other end is electrically connected to the battery management system 6 for transmitting the control signal to the battery management system 6. When the magnetic induction switch 2 is not closed, the control signal output terminal 5 is at a high potential because it is electrically connected to the positive pole of the power supply; and when the magnetic induction switch 2 is closed, the control signal output terminal 5 is connected to the negative pole of the power supply through the magnetic induction switch 2, and is at a high potential. It becomes a low potential, so the potential has a falling edge, and the power supply supplies power to the battery management system 6 through the control signal output terminal 5, so that the control signal is obtained.

[0019] The control device may also include an indicating device 3, which is connected in series in the current loop formed by the power supply and the magnetic induction switch 2 for indicating the current working state of the electric vehicle. The indicating device 3 is preferably a light-emitting diode, which is forwardly connected to the current loop formed by the power supply and the magnetic induction switch 1. When the magnetic induction switch 2 is closed, the light-emitting diode lights up, indicating that the electric vehicle is currently in a chargeable state When the magnetic induction switch 2 is turned off, the light-emitting diode is off, indicating that the electric vehicle is currently in a non-charging state.

[0020] The control device may also include a current-limiting resistor 4 connected in series between the positive electrode of the power supply and the control signal output terminal 5 to limit the current flowing through the magnetic induction switch 2 and the light-emitting diode, and prevent the magnetic induction switch 2 and The light-emitting diode is damaged. The resistance value of the current-limiting resistor 4 is selected according to the maximum current of the magnetic induction switch 2 and the light emitting diode, and the selection of the resistance value is well known to those in the art.

[0021] The working process of the control device of the electric vehicle charging system shown in Fig. 1 is as follows: when the electric vehicle needs to be charged, the two parts of the connecting plug are plugged together, that is, the charger end (that is, the first part) of the connecting plug is connected to the connecting plug The electric vehicle end (that is, the second part) is plugged in, the magnetic induction switch 2 is closed, the loop is turned on, and the light-emitting diode turns on. At this time, the potential of the control signal output terminal 5 changes from the high potential (12v) when the loop is disconnected to low At a potential (0v), the battery of the electric vehicle supplies power to the battery management system 6 to send a control signal to the battery management system 6. The battery management system 6 starts to work to check whether the voltage of each power battery is normal. If it is normal, a charging control signal is sent to the charging contactor 7, the charging contactor 7 is closed, and the high-voltage charger starts to charge the power battery pack. When the charging is over, disconnect the plug, the magnetic induction switch 2 is disconnected due to the loss of the external magnetic field, the potential of the control signal terminal 5 changes from low potential (0v) to high potential (12v) again, and the power supply stops supplying power to the battery management system 6. Therefore, the battery management system 6 loses the control signal, the charging contactor 7 is disconnected, and the high-voltage charger stops charging.