Fast charging refers to a charging method that enables the battery to reach or close to a fully charged state within 1 to 5 hours. It is often used in traction batteries that require charging when recovering in a short time in a short period of time. Fast charging is damaged to the performance and life of the battery. The normal charging of the battery is about 10 to 20 hours, how can quickly charge without damaging the performance and life of the battery, is a popular research topic.
Fast charging circuit characteristics
1. After the output voltage is set (for example, 36V), if the charging bottle plate is disengaged, a set of batteries are not passing, or short-circuiting, the battery is lowered or zero, then the charger will have no output. Current. Be
2, if the charging bottle voltage is deviated from the set voltage, such as the set voltage of 36V, incorrect 24V, 12V, 6V battery, etc., the charger does not output current, if set to 24V, 36V battery, due to charger The output voltage is lower than the battery voltage, and it cannot be charged to the battery. Be
3, when the two output terminals are short-circuited, due to the trigger circuit of the thyristor SCR in the charger, thus the controllable is not turned on, and the output current is zero. Be
4. If the battery is positive and negative, the controllable silicon diamond circuit is reversed, no trigger signal, the controllable silicon is not turned on, and the output current is zero. Be
5, using pulse charging, facilitating extending battery life. Since the low-voltage AC is fully waveled, it is pulsating DC. Only when the peak voltage is greater than the battery voltage, the controllable silicon will be turned on, and when the pulsating DC voltage is in the waveguide area, the controllable silicon is reversed and stopped to the battery. Charging, thus flowing through the battery is pulsating DC. Be
6, fast charging, full of self-stop. Since the voltage is low in the battery when the charge is started, the charging current is large. When the battery is about to sufficient (36V battery side voltage up to 44V), the charging current will become smaller and smaller because the charging voltage is getting closer to the peak value of the pulsating DC output voltage, and the charging current will become smaller and smaller. Automatic turbulent charging. When the voltage of the battery is charged to the maximum value of the peak of the rectified output, the charging process stops. After testing, the three-section electric vehicle battery 36V (12V / 12AH three sections are connected in series), which can be filled with this charger. Be
7, the circuit is simple, easy to make, almost no maintenance and maintenance.
Fast charging circuit principle
The AC220V market is converted into the transformer T1, and after the D1-D4 full-wave rectification, the charging circuit is supplied. When the output terminal is set by the correct polarity access set, if each half-wave peak value of the rectified output pulsating voltage exceeds the output voltage of the battery, the thyristor SCR is triggered by the collector current of Q. Charging the battery via a controllable silicon. When the pulsation voltage is close to the battery voltage, the controllable silicon is turned off to stop charging. Adjusting R4, adjusting the on-voltage of transistor Q, typically adjusting R4 from a large to small to Q to conduct a thyristor (turn). The lighting tube D5 is used as a power supply indication, while D6 is used as a charging indication. Technology area
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