As an energy replenishing device for electric vehicles, the charging performance of the charger is related to the service life and charging time of the battery pack. Realizing the fast, efficient, safe and reasonable power supply to the power battery is the basic principle of electric vehicle charger design. In addition, the applicability of the charger to various power batteries should also be considered. This article refers to the address: http:// Figure 1 shows the composition of the control system of the fast charger. This system is different from the continuous current charging and pulse current charging methods used by the traditional charger. It adopts the intelligent variable pulse charging mode, which is as shown in Figure 2. The charging current pulse includes a charging pulse T1 intermittent pulse T2 and a discharging pulse T3. The fast charger according to the real-time detected battery terminal voltage, charging current, temperature, dynamic internal resistance and the like, according to the mas charging law, by using an intelligent control algorithm to implement the charging current pulse width T1, the intermittent time T2, the discharge The segmentation of the current pulse T3 is performed to eliminate the polarization phenomenon of the charged battery pack, so that the battery pack is in a better current receiving state at all times, and the charging speed and the charging efficiency are improved. The specific adjustment process is that first, charging is performed with a wider charging pulse, and the terminal voltage of the battery rises. When the charging time T1 is reached, the charger suspends charging, and when the charging intermittent time reaches T2, the charger continues to be charged, and so on; When rising to the set voltage value V1, according to the setting of the program, the duty cycle of the charging pulse is reduced, and the battery is charged. When the battery terminal voltage reaches the set value V2, the charger intermittently suspends charging; according to the feedback voltage automatically The duty ratio of the output pulse is adjusted, and after a short time to stop charging, the polarization voltage of the battery drops rapidly, and the cycle is repeated until the charge end voltage V3 of the battery pack is reached. Figure 3 is a schematic diagram of a charger in a typical ground charging station consisting of a rectifier capable of converting input AC power to DC power and a power converter capable of regulating DC power by inserting a plugged cord In the sockets on the electric vehicle, DC power is charged into the battery. The charger is provided with a locking lever to facilitate insertion and removal of the plug, while the lever also provides a signal that determines the lock has been secured to ensure safety. According to the communication between the charger and the on-board battery management system, the power converter can adjust the DC charging power online, and the charger can display the charging voltage, the charging current, the charging amount and the charging cost. Bluetooth, LFP batttery,lithium battery Shenzhen Enershare Technology Co.,Ltd , https://www.enersharepower.com
