电动车充电器和蓄电池知识（Electric vehicle charger and battery knowledge）.docVIP

电动车充电器和蓄电池知识（Electric vehicle charger and battery knowledge） Charger classification: With and without frequency (50 Hz) transformer can be divided into two categories. Freight tricycle generally use charger charger with power frequency transformer, large volume and weight, the costs of electricity, but reliable, cheap; electric bicycle and electric motorcycle is the use of so-called switching power charger, power saving, high efficiency, but easy to bad. The correct operation of the switch power charger is: when charging, insert the battery first, then add the power supply; after sufficient, first cut off the power supply, then pull out the battery plug. If the battery plug is pulled out first when charging, especially when the charging current is large (red light), it is very easy to damage the charger. The common switching power charger is divided into two major categories, half bridge type and single drive type, and the single excitation type is divided into two types: forward type and flyback type. Half bridge is of high cost and good performance. It is often used in the charger with negative pulse. The single drive type has low cost and high market share. About negative pulse charger Lead acid battery has a history of more than 100 years, and began to introduce the old ideas and operating procedures all over the world: charging and discharging rate is 0.1C (C is battery capacity), and the service life is longer. In order to solve the problem of fast charging, American Max announced his research results to the whole world in 1967, charging with more than 1C rate pulse current and charging intermittently to discharge the battery. The discharge is beneficial to eliminate polarization, decrease electrolyte temperature and increase the acceptance charge of electrode plate. Some of our scientific and technical workers successfully made many kinds of fast charger in 1969 according to Mr. Maxs three law. The charging cycle is: charging with high current pulse, cutting