Fuzzy controller for charger for electric vehicle

Abstract

The invention relates to a fuzzy controller for a charger for an electric vehicle. The fuzzy controller adopts a fuzzy control technology to control supply or cut off of an alternating-current power supply to the applicable charger, determines whether the charger is converted in a floating-charge or charge-stopping state by judging the size of the current of the alternating-current power supply inputted into the charger of the electric vehicle roughly, sets the floating-charge delay time to make up the error of judgment, provides the certain floating-charge time for batteries, and sets the overtime counting time to limit the abnormal working time of the charger so as to prevent the faults of the system from expanding.

Description

technical field [0001] The invention relates to a fuzzy controller for an electric vehicle charger, which uses fuzzy control technology to control the supply and disconnection of an AC power supply to an applicable charger according to a set approximate control value. Background technique [0002] The electric vehicle charger is a very widely used battery charging device. The electric vehicle chargers used today are generally intelligent. Power supply, which is usually connected to the AC mains grid in two ways. [0003] 1. Directly connect the charger to the AC power grid through the plug-socket. This connection method must be manually pulled out to cut off the power supply. It is difficult to grasp the power-off time of the charger. Too early will lead to insufficient charging of the battery, which will easily polarize the battery plate, and too late a power outage will waste electric energy, especially for the charger that cannot enter the floating charge or stop chargin...

AI Technical Summary

Problems solved by technology

[0003] 1. Directly connect the charger to the AC power grid through the plug-socket. This connection method must be manually pulled out to cut off the power supply. It is difficult to grasp the power-off time of the charger. Too early will lead to insufficient charging of the battery, which will easily polarize the battery plate, and too late a power outage will waste electric energy, especially for the charger that cannot enter the floating charge or stop charging state due to battery shortage or other failures, which will cause damage battery, and even cause a fire

[0004] 2. Connect the charger to the AC power grid through a commercially available time controller, which uses manual intuition or experience to set the delay time to control and cut off the AC power supply of the charger, because it is impossible to set the time controller reasonably It is very easy to cut off the power supply of the charger too early or too late, and it is easy for users to ignore the faults of the charging system. The adverse effects are also obvious.

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