Charger classification: with, no frequency (50 Hz) transformer distinction, can be divided into two categories. Cargo three-wheel charger generally use the power transformer with a frequency transformer, large size, weight, electricity, but reliable, cheap; electric bicycles and electric motor use the so-called switching power supply charger, power, high efficiency, but Easy to bad Commonly used switching power supply charger is divided into half-bridge and single-excited two categories, single-excited class is divided into two types of forward and flyback. Half-bridge high cost, good performance, commonly used with negative pulse charger; single-shot low cost, high market share.

Lead-acid batteries have been 100 years of history, and began the world generally along the old point of view and operating procedures: charge and discharge rate of 0.1C (C is the battery capacity) longer life. In order to solve the problem of fast charging, Mr. Ames published his research results to the world in 1967, charged with a pulse current greater than 1C, and charged the battery during intermittent charging. Discharge is conducive to the elimination of polarization, reduce the temperature of the electrolyte, to improve the ability of the plate to accept the charge.

Some of our country's science and technology workers in 1969 around, according to Mr. Max's three laws of the successful production of a variety of brands of fast charger. Charging cycle process is: large current pulse charge → cut off the charge path → the battery briefly discharge → stop discharge → connected to the charge path → high current pulse charging ... ... 2000 years ago, some people use this principle to the electric car charger, During the charging process, do not cut off the charging path, with a small resistor to short-circuit the battery moment, the discharge. Short circuit due to not cut off the charging channel, in the charging channel in series inductance. Usually in 1 second short circuit 3-5 milliseconds (1 second = 1000 milliseconds), because the inductor current can not jump, short circuit time is short, you can protect the charger power conversion part. If the charging current direction is called, the discharge is naturally negative, the electric car industry appeared on the term "negative pulse charger", and that can extend the battery life and so on.

In recent years, electric vehicles generally use the so-called three-stage charger, the first stage called constant current stage, the second stage called constant pressure stage, the third stage called trickle stage. From the perspective of electronic technology for the battery: the first stage called charge current limiting stage, the second stage called high constant pressure stage, the third stage called low constant pressure stage more appropriate. The second stage and the third stage of conversion, the panel lights corresponding transformation, most of the first and second stage charger is a red light, the third stage of the green light. The second stage and the third phase of the conversion is determined by the charging current, greater than a current into the first second stage, less than a current into the third stage. This current is called conversion current, also known as turning current.

Buy the new charger to check the three important parameters of the three-stage charger, the first important parameter is the trickle stage of the low constant voltage value, the second important parameter is the second stage of the high constant pressure value, the third The important parameter is the conversion current. These three important parameters and the number of batteries, and the battery capacity Ah, and temperature-related, and the battery type. The user can generally measure the third stage of the low constant pressure. Method is not to receive the battery, to the charger plus electricity, with a digital multimeter 200V DC voltage measurement charger output voltage. The other two parameters of high constant voltage and the reverse current generally need special tools to be measured.

Switching power supply charger is the correct operation: charging, the first plug the battery, after the electricity; adequate, first cut off the mains, after pulling the battery plug. If the battery plug first when charging, especially when the charging current is large (red), it is very easy to damage the charger.

Also note that: 1, then turn green light and then fill 2-3 hours. 

2, the principle is shallow (electric) ground charge (electricity), that is, riding is not far enough, but also timely charging, to avoid light and then recharge.

 3, long-term do not ride, to regular (2-3 months) charge once.

 4, long-term shallow battery, 3 months or so, for a deep discharge, is the so-called light recharging, is conducive to the battery deep long-term activation of the material. The effect of light is to ride the controller battery undervoltage protection action so far. 

5, the general new battery put into use 8-10 months after the battery to check and maintain. 

6, the general brand car supporting the charger is filtered, usually do not have to test, but alone to the market procurement of non-matching charger, be sure to carry out the three parameters of the test. 

7, there is a frequency transformer with no power transformer, direct rectifier mains for the battery charge, the current can be 30A, the voltage 12V-80V adjustable, not completely cut off the electricity before, do not touch the battery, freight Three customers who use this type of charger should pay special attention to safety.