Overload protection device and overload protection method for a charging pile

Abstract

The present invention relates to the technical field of charging piles, and particularly to an overload protection device and an overload protection method for a charging pile. The following technical solutions are adopted: It includes a main controller, an input power processing circuit, a plurality of sub-controllers, and a plurality of charging output circuits; the input power processing circuit is connected to the plurality of charging output circuits, and the main controller is connected to the input power processing circuit and the plurality of sub-controllers; a power detection module and a power distribution limiting module are provided in the main controller. The power detection module obtains the charging power of each charging output circuit, and the power distribution limiting module distributes and limits the charging power of each charging output circuit. The advantages are as follows: By using the main controller to detect the charging status of multiple charging output circuits, when the total output power exceeds the rated power, it is distributed according to the charging status of each charging output circuit, and the maximum charging efficiency of each charging output circuit can be achieved on the premise of overload protection.

Description

Technical Field

[0001] The present invention relates to the technical field of charging piles, and in particular, to an overload protection device and an overload protection method for a charging pile. Background Art

[0002] With the popularization of new energy electric vehicles, charging piles for electric vehicles have gradually become popular, and many parking lots are equipped with charging sockets or charging piles for charging electric vehicles. To ensure the normal and safe use of charging piles, overload protection devices are installed in charging piles. When the charging power exceeds the rated power, overload protection is carried out by means of power-off or power output limitation. For a charging pile with multiple outputs, this type of overload protection is likely to cause multiple charging lines to be powered off or have their power output limited simultaneously, and it is impossible to appropriately allocate the charging power according to the charging status of each line. Summary of the Invention

[0003] The purpose of the present invention is to provide an overload protection device and an overload protection method for a charging pile, specifically to provide an overload protection device and an overload protection method that can appropriately allocate power according to the charging status of each charging line.

[0004] To achieve the above object, the present invention adopts the following technical solution: An overload protection device for a charging pile includes a main controller, an input power supply processing circuit, a plurality of sub-controllers, and a plurality of charging output circuits corresponding to the plurality of sub-controllers one by one; the input power supply processing circuit is connected to the plurality of charging output circuits, the main controller is connected to the input power supply processing circuit and the plurality of sub-controllers, and the plurality of sub-controllers are connected to the plurality of charging output circuits one by one; a power detection module and a power distribution and limitation module are provided in the main controller. The power detection module obtains the charging power of each charging output circuit by connecting with the sub-controller, and the power distribution and limitation module distributes and limits the charging power of each charging output circuit by connecting with the sub-controller.

[0005] Specifically, a charging status monitoring module is further provided in the main controller. The charging status monitoring module obtains the charging status of the charging output circuit by connecting with the sub-controller, and the charging status monitoring module is connected to the power distribution and limitation module.

[0006] Specifically, a power adjustment module is provided in the sub-controller, and the power adjustment module includes a step-down module and a current limiting module.

[0007] Specifically, a temperature detection device is further included. The temperature detection device is arranged inside the charging pile. A temperature acquisition module is provided in the main controller and is connected to the temperature detection device. A rated power adjustment module is further provided in the main controller, and the rated power adjustment module is connected to the temperature acquisition module.

[0008] An overload protection method for a charging pile: The main controller of the charging pile uses a power detection module to connect to multiple sub-controllers of the charging pile where it is located and obtain the charging power of each charging output circuit. When the total charging power of each charging output circuit exceeds the rated power, a power limit value is sent to each sub-controller using a power distribution limit module. After each sub-controller receives the power value limit, it adjusts the power of the charging output circuit by adjusting the output of the control terminal connected to the charging output circuit, thereby reducing the total charging power and achieving the purpose of overload protection.

[0009] Among them, the main controller uses a charging status monitoring module to obtain the charging status of each charging output circuit from each sub-controller, and judges whether each charging output circuit is in a fast charging state or a slow charging state. If the charging output circuit is in a fast charging state, the charging power of this charging output circuit is limited. If the charging output circuit is in a slow charging state, the charging power of this charging output circuit is not limited.

[0010] Specifically, the sub-controller uses a power adjustment module to adjust the charging output circuit according to the power limit value sent by the main controller and the current charging status. If the current charging output circuit is in a charging state of high voltage and low current, the buck module of the power adjustment module is used to reduce the charging voltage of the charging output circuit. If the current charging output circuit is in a charging state of low voltage and high current, the current limiting module of the power adjustment module is used to limit the charging current.

[0011] Furthermore, the main controller also uses a temperature acquisition module to obtain the temperature value inside the current charging pile through a temperature detection device set inside the charging pile, and uses a rated power adjustment module to adjust the rated power value according to the temperature inside the current charging pile.

[0012] The advantages of the present invention are as follows: By using the main controller to detect the charging status of multiple charging output circuits, when the total output power exceeds the rated power, it is distributed according to the charging status of each charging output circuit, and the charging efficiency of each charging output circuit can be maximized on the premise of overload protection. Description of the Drawings

[0013] Appendix Figure 1 It is the connection schematic diagram of the overload protection device for the charging pile in the embodiment. Specific Embodiments

[0014] Example 1, refer to Figure 1, An overload protection device for a charging pile, comprising a main controller, an input power processing circuit, a plurality of sub-controllers, and a plurality of charging output circuits corresponding to the plurality of sub-controllers one by one; the input power processing circuit is connected to the plurality of charging output circuits, the main controller is connected to the input power processing circuit and the plurality of sub-controllers, and the plurality of sub-controllers are connected to the plurality of charging output circuits one by one; a power detection module and a power distribution limiting module are arranged in the main controller, the power detection module obtains the charging power of each charging output circuit by connecting with the sub-controller, and the power distribution limiting module distributes and limits the charging power of each charging output circuit by connecting with the sub-controller.

[0015] In this embodiment, the main controller of the charging pile uses the power detection module to connect with a plurality of sub-controllers of the charging pile where it is located and obtains the charging power of each charging output circuit. When the total charging power of each charging output circuit exceeds the rated power, the power distribution limiting module is used to send a power limit value to each sub-controller. After each sub-controller receives the power value limit, it adjusts the power of the charging output circuit by adjusting the control end connected to the charging output circuit, thereby reducing the total charging power and achieving the purpose of overload protection.

[0016] Specifically, a charging state monitoring module is further arranged in the main controller. The charging state monitoring module obtains the charging state of the charging output circuit by connecting with the sub-controller, and the charging state monitoring module is connected to the power distribution limiting module. The main controller uses the charging state monitoring module to obtain the charging state of each charging output circuit from each sub-controller, and judges whether each charging output circuit is in a fast charging state or a slow charging state. If the charging output circuit is in a fast charging state, the charging power of this charging output circuit is limited. If the charging output circuit is in a slow charging state, the charging power of this charging output circuit is not limited.

[0017] Specifically, a power adjustment module is arranged in the sub-controller, and the power adjustment module includes a buck module and a current limiting module. The sub-controller uses the power adjustment module to adjust the charging output circuit according to the power limit value sent by the main controller and the current charging state. If the current charging output circuit is in a charging state of high voltage and low current, the buck module of the power adjustment module is used to reduce the charging voltage of the charging output circuit. If the current charging output circuit is in a charging state of low voltage and high current, the current limiting module of the power adjustment module is used to limit the charging current.

[0018] Specifically, it further includes a temperature detection device. The temperature detection device is arranged inside the charging pile. A temperature acquisition module is arranged in the main controller and is connected to the temperature detection device. A rated power adjustment module is also arranged in the main controller, and the rated power adjustment module is connected to the temperature acquisition module. The main controller uses the temperature acquisition module and obtains the current temperature value inside the charging pile through the temperature detection device arranged in the charging pile, and uses the rated power adjustment module to adjust the rated power value according to the current temperature inside the charging pile.

[0019] An overload protection method for a charging pile: The main controller of the charging pile uses a power detection module to connect to multiple sub-controllers of the charging pile where it is located and obtains the charging power of each charging output circuit. When the total charging power of each charging output circuit exceeds the rated power, it uses a power distribution limit module to send a power limit value to each sub-controller. After each sub-controller receives the power value limit, it adjusts the power of the charging output circuit by adjusting the control end connected to the charging output circuit, thereby reducing the total charging power and achieving the purpose of overload protection.

[0020] Among them, the main controller uses a charging state monitoring module to obtain the charging state of each charging output circuit from each sub-controller, and judges whether each charging output circuit is in a fast charging state or a slow charging state. If the charging output circuit is in a fast charging state, the charging power of this charging output circuit is limited. If the charging output circuit is in a slow charging state, the charging power of this charging output circuit is not limited.

[0021] Specifically, the sub-controller uses a power adjustment module to adjust the charging output circuit according to the power limit value sent by the main controller and the current charging state. If the current charging output circuit is in a charging state of high voltage and low current, the buck module of the power adjustment module is used to reduce the charging voltage of the charging output circuit. If the current charging output circuit is in a charging state of low voltage and high current, the current limiting module of the power adjustment module is used to limit the charging current.

[0022] Furthermore, the main controller also uses a temperature acquisition module and obtains the current temperature value inside the charging pile through the temperature detection device arranged in the charging pile, and uses the rated power adjustment module to adjust the rated power value according to the current temperature inside the charging pile.

[0023] Certainly, the above is only a preferred embodiment of the present invention, and it does not limit the scope of use of the present invention. Therefore, all equivalent changes made on the principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An overload protection method for a charging pile, characterized in that: The main controller of the charging pile is connected to multiple sub - controllers of the charging pile where it is located through a power detection module and obtains the charging power of each charging output circuit. When the total charging power of each charging output circuit exceeds the rated power, it uses a power distribution limiting module to send a power limit value to each sub - controller. After each sub - controller receives the power value limit, it adjusts the power of the charging output circuit by regulating the output of the control terminal connected to the charging output circuit, thereby reducing the total charging power and achieving the purpose of overload protection. Among them, the main controller also uses a charging status monitoring module to obtain the charging status of each charging output circuit from each sub - controller, and judges whether each charging output circuit is in a fast - charging state or a slow - charging state. If the charging output circuit is in a fast - charging state, the charging power of this charging output circuit is limited. If the charging output circuit is in a slow - charging state, the charging power of this charging output circuit is not limited. The sub - controller uses a power adjustment module to adjust the charging output circuit according to the power limit value sent by the main controller and the current charging status. If the current charging output circuit is in a charging state of high voltage and low current, the buck module of the power adjustment module is used to reduce the charging voltage of the charging output circuit. If the current charging output circuit is in a charging state of low voltage and high current, the current - limiting module of the power adjustment module is used to limit the charging current.

2. The overload protection method of a charging pile according to claim 1, characterized in that: The main controller also uses a temperature acquisition module and obtains the current temperature value inside the charging pile through a temperature detection device set inside the charging pile, and uses a rated power adjustment module to adjust the rated power value according to the current temperature inside the charging pile.

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