Solar lawn light circuit

(1) Introduction to solar cells Solar cells are developing rapidly. In the next 10 years, the average conversion efficiency of solar cells will reach about 30%
, and the price will drop by half. Half of the lighting power can come from solar energy, achieving true green lighting from PN junction to PN junction. The solar
cell is a huge PN junction, and the LED is a PN junction that can convert energy into light. Its conversion efficiency will definitely reach the level of
energy-saving , and its service life can reach more than 100,000 hours. This is Truly green lighting.
    (2) The functions of solar cells mainly have the following functions: ① Battery overcharge and over-discharge protection; ② Automatic recovery of discharge function after charging;
③ Anti-reverse charge (battery charges to solar battery ) function; ④ Temperature compensation function; ⑤ Automatic opening , light-off function (turn on at night, cut off
the load during the day); ⑥Maximum 5A high current discharge function.
    The main light source of the iuoi type is mainly a three-primary color high-efficiency energy-saving lamp. Of course, it is also suitable for LED lamp cups, which have high brightness but relatively high cost. (2)
The Rl01 solar light control circuit adopts a patch design and is mainly suitable for high-end lawn lights and ordinary garden lights. The battery is a 12V small lead-
acid battery. '
    (3) Solar green lighting circuit Solar lawn lamp circuit is shown in Figure 16-60.
The core of time-sharing and voltage-sharing control solar lamp technology is to control the input power of solar lamps according to people's different requirements for illumination at different times of the night and
the amount of energy absorbed by solar cells during the day, so as to design a lamp that can meet the most demanding needs at the lowest cost.
The purpose of people's most basic requirements for solar lights under severe weather conditions .
    This control circuit is suitable for lawn lamps with 12 LEDs as light sources. U1 contains
circuits such as driver, light control detection, pulse width modulation, and battery voltage detection. Pin ① is the enable terminal, pin ② is the power supply voltage, pin ④ is the load current adjustment port, pin ⑤ is the switch port, pin ⑧ is the connector, and ③,
⑥, and ⑦ are all floating. Changing the resistance value can change the operating current of the 3ff LED. Its maximum allowable current is 500mA. The current flow is minimum when R4 is connected to ground
.
  Jl is a solar cell, J2 is a power switch, and J3 is a 2-cell nickel-metal hydride battery. In order to reduce the pressure drop in the pipe. VD1 and VD2 can use Schottky diode
tubes. Changing Rs and R can save the partial voltage protection value of the battery, and changing R1 and Rz can adjust the time-sharing value. This circuit can
ensure the lighting time while reducing the cost of solar cells as much as possible, and has a high cost performance.