CN-121984204-A - Power-down protection system, method, storage medium and equipment for charging pile

CN121984204ACN 121984204 ACN121984204 ACN 121984204ACN-121984204-A

Abstract

The embodiment of the invention discloses a power failure protection system for a charging pile, which comprises a system power module, a whole pile control board, a super capacitor and a controller, wherein the system power module is used for connecting a power grid and providing direct current output current, the whole pile control board is used for executing a key task of the charging pile, the super capacitor is connected with the output side of the system power module in parallel through a low internal resistance wire, the controller is electrically connected with the super capacitor and the whole pile control board, the controller is configured to control the system power module to charge the super capacitor when the power grid is normally powered, control the super capacitor to discharge to the whole pile control board to maintain the operation of the super capacitor when the power grid is detected to be powered down, and control the whole pile control board to execute the key task according to a preset task priority strategy during the discharging period of the super capacitor.

Inventors

HOU NING
LI ENHU
YU SHAOSHAN
TIAN ZHIQIANG
SHI YU

Assignees

绿能慧充数字技术有限公司

Dates

Publication Date: 20260505
Application Date: 20260114

Claims (10)

1. A power loss protection system for a charging stake, the system comprising: The system power supply module is used for connecting a power grid and providing direct-current output current; The pile control board is used for executing the key tasks of the charging pile; The super capacitor is connected in parallel with the output side of the system power supply module through a low internal resistance wire; The controller is electrically connected with the super capacitor and the whole pile control board; wherein the controller is configured to: when the power grid supplies power normally, the system power module is controlled to charge the super capacitor; when the power failure of the power grid is detected, the super capacitor is controlled to discharge to the whole pile control board so as to maintain the operation of the super capacitor; and during the discharging period of the super capacitor, controlling the whole pile control board to execute a key task according to a preset task priority strategy.
2. The power down protection system for a charging stake of claim 1, wherein the critical tasks include at least any one of saving settlement data, logging a travel log, driving a charging gun electromagnetic lock to unlock.
3. The power down protection system for a charging pile according to claim 2, wherein the supercapacitor is a DC12V supercapacitor, the capacity of which is determined according to the following formula : Wherein, the Is the capacity of the super capacitor, The average power consumption of the whole pile control board in the normal working state, Minimum endurance time after power failure is required for the system, The whole energy conversion efficiency of the circuit from the super capacitor to the whole pile control board, An initial voltage when the super capacitor starts to discharge, And (5) discharging the super capacitor to terminate the voltage.
4. The power-down protection system for a charging pile according to claim 3, wherein a protection resistor R is connected in series in a charging and discharging loop of the super capacitor module, and the resistance value of the protection resistor R is calculated according to the following formula: Wherein, the To protect the resistor, Maximum peak impact current allowed to bear by the super capacitor, Is the normal output voltage of the system power supply module, Is the initial voltage of the super capacitor.
5. The power down protection system for a charging stake of claim 4, wherein the controller is further configured to monitor a health status of the super capacitor, comprising: Applying a short-time load pulse to the power-down protection system of the charging pile, measuring corresponding voltage drop and current variation, and calculating a current equivalent series resistance value according to the voltage drop and the current variation; Collecting the discharge time of constant-current discharge of the super capacitor from full-power voltage to cut-off voltage and calculating the current capacity retention percentage; and determining the health state of the super capacitor according to the equivalent series resistance value and the current capacity retention percentage.
6. The power down protection system for a charging stake of claim 5, wherein the controlling the integral stake control panel to perform critical tasks further comprises: judging the residual energy of the super capacitor; if the remaining energy meets the requirement of storing the settlement data task, the task is preferentially executed; if the residual energy still meets the requirement of recording the running log task after the execution, continuing to execute the task; and if the residual energy still meets the requirement of driving the electromagnetic lock unlocking task of the charging gun after the execution, finally executing the task.
7. The power loss protection system for a charging pile of claim 6, wherein the controller is further configured to provide a grid voltage sag support function: When the power grid voltage is detected to be lower than the difference between the normal working voltage and a preset sag threshold value, the super capacitor is controlled to supplement power to the output side of the system power supply module through a bidirectional DC/DC converter so as to maintain the stability of the output voltage.
8. A power-down protection method for a charging pile, the method being applied to the system of claim 1, the method comprising: When the power grid supplies power normally, a system power module of the charging pile is controlled to charge a super capacitor module connected in parallel to the output side of the charging pile, and the super capacitor module is maintained in a full-power state; continuously monitoring the voltage of a power grid, and automatically switching to a pile control board for supplying power to the charging pile by the super capacitor module when the power failure of the power grid is detected; During the power supply of the super capacitor module, controlling the whole pile control board to execute key operations, wherein the key operations comprise at least one of completing charging order settlement, saving a system log and controlling a charging gun electromagnetic lock to be unlocked; And monitoring the terminal voltage of the super capacitor module in real time, and stopping power supply to protect the super capacitor module when the terminal voltage is reduced to a preset discharge termination voltage.
9. A readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of the method of claim 7.
10. A computer device comprising a memory and a processor, wherein the memory stores a computer program which, when executed by the processor, causes the processor to perform the steps of the method of claim 7.

Description

Power-down protection system, method, storage medium and equipment for charging pile Technical Field The present invention relates to the field of charging system control technologies, and in particular, to a power failure protection system, a method, a storage medium, and an apparatus for a charging pile. Background With the rapid development of the global electric automobile industry, the charging pile is used as a core infrastructure, and the reliability and the user experience are of great importance. However, in actual operation, the charging pile faces a common and troublesome problem of data loss and functional locking caused by unexpected power failure of the power grid. Specifically, for mainstream charging piles such as the European standard, the Japanese standard and the national standard, a series of defects can be exposed when the power grid is cut off in the charging process. Firstly, the power grid is powered down, so that the whole pile control board of the charging pile is instantly powered down, and the ongoing charging order settlement data is lost due to the fact that the charging order settlement data are not saved. This not only causes economic loss and statistical distortion of the operating data for the operators, but also is more likely to cause cost disputes with the users. Meanwhile, the storage of the system operation log is also interrupted, so that when a fault occurs, operation and maintenance personnel cannot accurately position according to the complete log record, and the investigation and repair time is greatly prolonged. Secondly, for a charging gun equipped with an electromagnetic lock, the unlocking action of the charging gun depends on an electric signal sent by a control panel. Once the power is turned off, the control panel breaks down, an unlocking instruction cannot be sent, the charging gun is locked on the vehicle, and a user cannot pull out the charging gun. The charging pile has the advantages that great inconvenience and potential safety hazards are brought to users, the charging parking space is occupied in a long-time invalid mode, and the turnover and the use efficiency of the charging pile are reduced. In the prior art, although there are schemes that use uninterruptible power supplies or storage batteries as backup power supplies, these schemes have obvious short boards. The traditional UPS system has the problems of high cost, large volume, inconvenience for integration in the charging pile, short cycle life, low charging and discharging speed, high maintenance cost and the like of the storage battery, and is difficult to meet the specific requirements of the charging pile on short-time, high-reliability and maintenance-free backup power supply. Therefore, an innovative solution to the problem of power-down protection of the charging pile is needed in the art. Disclosure of Invention Based on this, it is necessary to provide a power-down protection system for the charging pile in view of the above problems. A power loss protection system for a charging stake, the system comprising: The system power supply module is used for connecting a power grid and providing direct-current output current; The pile control board is used for executing the key tasks of the charging pile; The super capacitor is connected in parallel with the output side of the system power supply module through a low internal resistance wire; The controller is electrically connected with the super capacitor and the whole pile control board; wherein the controller is configured to: when the power grid supplies power normally, the system power module is controlled to charge the super capacitor; when the power failure of the power grid is detected, the super capacitor is controlled to discharge to the whole pile control board so as to maintain the operation of the super capacitor; and during the discharging period of the super capacitor, controlling the whole pile control board to execute a key task according to a preset task priority strategy. In the above scheme, the key tasks at least comprise any one of storing settlement data, recording running logs and driving the electromagnetic lock of the charging gun to unlock. In the above scheme, the supercapacitor is a DC12V supercapacitor, and the capacity of the DC12V supercapacitor is determined according to the following formula: Wherein, the Is the capacity of the super capacitor,The average power consumption of the whole pile control board in the normal working state,Minimum endurance time after power failure is required for the system,The whole energy conversion efficiency of the circuit from the super capacitor to the whole pile control board,An initial voltage when the super capacitor starts to discharge,And (5) discharging the super capacitor to terminate the voltage. In the above scheme, the charging and discharging loop of the super capacitor module is connected in series with a protection resistor R, and the resistance value of the