With the development of photovoltaic power generation technology, solar lighting fixtures have emerged in solar energy application products and are attracting more people's attention. Solar lighting fixtures are usually divided into: solar lawn lights, Solar Garden Lights, solar street lights, and so on. Although it has been restricted by factors such as cost and stability, it has not been widely promoted, but its future is very bright. The core technology of solar lamps: First, low-power, high-brightness, long-life light source technology; second, solar cells are the best charge and discharge technology for batteries. These two directional problems have been solved, and many problems have been solved. Light source problem, the main problem of light source is: the vibrator is easily damaged in the high voltage circuit, the lamp life is short, the reliability is not high; the light source power is large, but the brightness is low, and the high power light source causes a large system configuration, which doubles the system cost. An example is estimated as follows: If the ordinary solar luminaire uses a light source of 80 W, the component is 240 W. If a new 25W light source is used instead of the same brightness, about 100W of the component is required. If the system cost is calculated at 60 yuan/W, the cost of ordinary solar lamps is 240W×60 yuan ∥W=1.44 million yuan; the new solar lamps are 100W×60 yuan/W=0.6 million yuan. A single lamp has a difference of 8,400 yuan. It has not considered the favorable effect of reducing the failure rate, installation and maintenance costs, etc. after the system is reduced. Many manufacturers have been looking for more suitable light sources, however, there are very few such products on the market. There is no product in the market or the product is not closed. It is not necessarily a bad thing to look at it from another angle. If it is not needed, it means a business opportunity. In this aspect, if you invest and achieve results, you will master one of the core technologies of solar lamps. The market took the lead. If you want to invest in the solar lighting market on a large scale and lead the trend, you must master the core technology of solar lighting, otherwise it will be placed behind. Controller charging method and parameter setting problem, conventional charging method 1. Constant current charging method: The constant current charging method is a charging method that adjusts the output voltage of the charging device or changes the resistance in series with the battery to keep the charging current intensity constant. The control method is simple, but since the acceptable current capability of the battery is gradually decreased as the charging process progresses, the charging current is mostly used for electrolyzing water to generate gas in the late stage of charging, so that the outgas is excessive. 2. Stage charging method: 1) Stage method. First, it is charged to a predetermined voltage value with a constant current, and then changed to a constant voltage to complete the remaining charging. 2) Three-stage charging method. Constant current charging is used at the beginning and end of charging, and constant voltage is used in the middle. When the current decays to a predetermined value, the second phase is switched to the third phase. This method can minimize the amount of gas output, but it is still limited as a fast charging method. 3. Constant voltage charging method: The voltage of the charging power source maintains a constant value during the entire charging time, and the current gradually decreases as the voltage of the battery terminal gradually increases. Compared with the constant current charging method, the charging process is closer to the optimal charging curve. This charging method seldom electrolyzes water and avoids overcharging of the battery. However, in the initial stage of charging, the current is too large, which has a great influence on the battery life, and it is easy to bend the battery plate and cause scrapping. Fast charging method 1. Pulse charging method: The pulse charging method first charges the battery with pulse current, then recharges the battery after charging for a period of time, so that the charging pulse is cycled; the battery is fully charged, and the battery is chemically charged during the intermittent period. The oxygen and hydrogen generated by the reaction are recombined and absorbed, and the concentration polarization and the ohmic polarization are naturally eliminated, thereby reducing the internal pressure of the battery and enabling the next round of constant current charging to proceed more smoothly. So that the battery can absorb more power. Intermittent pulse; in the battery to have a more sufficient reaction time, reducing the amount of gas, and improve the acceptance rate of the battery to the charging current. 2. Variable current intermittent charging method: Variable current intermittent charging method is a method of intermittently charging and limiting current charging. In the early stage of charging, the variable current intermittent charging is used to make the battery obtain most of the charging amount. In the later stage of charging, a constant voltage charging section is used to obtain an overcharge amount. By intermittently stopping the charging, the oxygen and hydrogen generated by the chemical reaction of the battery are recombined and absorbed, and the concentration polarization and the ohmic polarization are naturally eliminated, thereby reducing the internal pressure of the battery and enabling the next round. The constant current charging can be performed more smoothly and the battery can absorb more power. 3. Variable voltage intermittent charging method: The difference from the variable current intermittent charging method is that the first stage uses not intermittent constant current but intermittent constant pressure. In each constant voltage charging phase, the charging current naturally decreases exponentially, and has the characteristics that the acceptable rate of the battery current gradually decreases as the charging progresses. 4. Variable voltage variable current wave type intermittent positive and negative zero pulse fast charging method: the pulse current amplitude and the frequency of the PWM signal are fixed, the PWM duty ratio is adjustable, and the intermittent stop charging phase is added on the basis of this, which can be shorter Charge more battery power during the time to improve the battery's charge acceptance.
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