Solar lawn lamp related issues
Control the load size according to the battery voltageSolar lawn lamps often require continuous rain and high maintenance time, which increases the system cost. We reduce the number of LED connections, or reduce the daily emission time of the solar lawn lights, which reduces the system cost when the continuous cloudy storage battery voltage is lowered.
FlickerLight gradually dimming is a good way of saving energy, it can increase the solar irradiation effect, on the other hand can change the flashing duty ratio control battery average output current, prolong the time of the system, or under the same conditions, can reduce the solar power, the cost will be greatly decreased.
Solar cell packagingThere are two main types of package type solar battery, and epoxy laminate. The lamination process can ensure the service life of solar cells for more than 25 years, although the glue appearance, but only 1-2 years working life of solar cell. Therefore, small power solar lawn lamp below 1W, in the absence of high life requirements, you can use the glue package for solar lawn lamp service life requirements, recommend the use of laminated package.
Photosensitive sensorNeed solar lawn lamp light control switch, the designer often will automatically switch lights with photosensitive resistance, in fact the solar cell itself is an excellent light sensor, do it with a photosensitive switch, photosensitive resistance characteristics than good. For solar lawn lamp using only a 1.2VNi Cd battery, solar battery module is composed of four solar cells in series, low voltage, voltage lower under weak light, and the days without black voltage is less than 0.7V, resulting in optical switch failure. In this case, the problem can be solved by adding a transistor directly coupled with amplification.
