Source of negative pulse charger

- Aug 13, 2019-

Lead-acid batteries have been around for more than 100 years, and they have begun to follow the old-fashioned view and operating procedures: the charge and discharge rates are 0.1C (C is the battery capacity) and the life is longer. In order to solve the problem of fast charging, Mr. Max, the Americans released his research results to the world in 1967, charging with a pulse current greater than 1C, and discharging the battery during intermittent charging. Discharge helps to eliminate polarization, lower electrolyte temperature, and increase the ability of the plates to accept charge.

Some technologists in China made successful multi-brand fast chargers according to Mr. Max's three laws before and after 1969. The charging cycle process is: high current pulse charging → cut off the charging path → short discharge to the battery → stop discharging → turn on the charging path → charge the large current pulse...

Around 2000, some people used this principle in the electric vehicle charger. During the charging process, the charging path was not cut off, and the battery was short-circuited with a small resistor for discharging. In the short circuit, since the charging path is not cut, the inductance is connected in series in the charging path. Generally, it is short-circuited for 3-5 milliseconds in 1 second (1 second = 1000 milliseconds). Since the current in the inductor cannot jump, the short-circuit time is short, and the power conversion portion of the charger can be protected. If the direction of the charging current is called positive, the discharge is naturally negative, and the electric vehicle industry has the term "negative pulse charger", and it can be said to extend battery life and so on.