The basic PV applications. Here's switch K1 and K3 is charging switch, K3 to discharge switch, they are part of the solar energy control center. The figure by the opening and closing of the switch control circuit according to the charge and discharge status of the system to decide. When the battery is fully charged, the charging switch off when charging is required charging switch is closed; closed when the battery discharge K2, or disconnected. These control circuits can be used transistors, resistors, capacitors, inductors form a voltage comparator boost charging and discharging circuit, light control circuit can also be used, or the use of integrated operational amplifier constitutes a voltage comparator hysteresis can also be used microcontroller.
In general, a qualified solar charge controller has the following charge-discharge protection modes: 1, direct charge voltage protection point: direct charge, also called emergency charge, are fast charging, usually when the battery voltage is low with a relatively high current and high voltage battery charging, however, there is a control point, also known as conservation sites is the values ??in the table, the charging time when the battery voltage is higher than the protection value, stop direct charge. Direct charge protection point voltage is generally "overcharge protection point" voltage, the charging battery terminal voltage can not exceed this protection point, otherwise it will cause overcharge, the battery is damaging.
2, both charge control point voltage: direct charge after the end of the battery can be charged and discharged generally stand controllers for some time, let the voltage drops naturally, immediately fell "recovery voltage" values, will enter all charge state. Why design are sufficient? When the direct charge is completed, there may be individual cells "backward" (relatively low terminal voltage), in order to pull back these individual molecules, so that all the battery terminal voltage has a uniform consistency, so we should take a high voltage with moderate Current refill it a little while, we can see the so-called BC, that is "balanced charge." BC time not too long, usually a few minutes - ten minutes, the time setting is too long but harmful. For small systems equipped with a two batteries are charging little significance. So, lights controller generally does not have sufficient, with only two stages.
More information visit http://www.cn-solargardenlights.com
没有评论:
发表评论