Solar energy saving lamp design

Solar cells have the unique advantages of low cost and no pollution due to the use of sunlight. In recent years, with the development of solar technology, the production cost of solar cells has also been greatly reduced, so it has been widely used. Solar energy-saving lamps are a new application technology for solar cells. The following two technologies are used for this technology. Solar energy-saving lamps use daytime sunlight as energy, use solar cells to charge batteries, and store solar energy conversion energy in batteries. In use, the battery is used as a power source to supply energy to the energy-saving lamp, and the chemical energy in the battery is converted into light energy to make the energy-saving lamp work. The specific working principle diagram of the energy-saving lamp is shown in the figure below, and the following schematic diagram is combined for analysis.

The circuit structure can be divided into six parts, including solar cells, batteries, protection circuits, Schmitt triggers, multivibrators, and output stages.

The following is a detailed analysis of the role and working principle of each part of the circuit: solar cells are the core components of energy-saving lamps. For example, E1, this is an energy conversion device that converts light energy into electrical energy and stores it in a battery.

The performance of solar cells determines the conversion efficiency of energy and the stability of output voltage, which directly determines the performance of energy-saving lamps. The internal resistance must be chosen to be small when using. A solar cell with stable output voltage.

Actual energy-saving lamps are usually used at night or in dark areas, so the solar energy during the day must be stored. The battery is the best energy storage. However, the storage cost is high and there is a certain requirement for the working voltage, and a certain protection circuit needs to be added. Medium E2 is the battery, and Rl, R2, R3, and T1 form an input overvoltage protection circuit for E2. When the output voltage of the solar cell rises to a certain value for some reason, the voltage across R2 increases correspondingly, so that T1 is turned on, T1 is turned on, and the collector current is increased. On the one hand, the increase of the load causes the output voltage of the solar cell to have The decrease, on the other hand, increases the current so that the voltage drop across R3 increases, so that the voltage delivered to the battery is not too high, protecting the battery. The specific protection point can be set by adjusting Rl and R2. D1 acts as a protection against input undervoltage. When the output voltage of the solar cell is lower than E2, the battery will not reversely charge the solar cell, so as to avoid overcurrent and unnecessary energy loss of the battery.

In actual use, the battery must be protected not only with the input, but also with the output. Because the operating voltage of the battery has a certain range, especially when the voltage is too low (the protection is too low when the battery is too low). The Schmitt trigger turns on and off the return voltage of the trigger level. 'To control the battery voltage range. Here T2, T3 and peripheral circuit account ┟芴卮シ (2) 鳎 シ シ (2) 髂 畹 畹 畹 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定 确定When the battery voltage rises to a certain value, T4 turns on, so that the multivibrator oscillates, generates a pulse signal, the output stage works, the lamp lights up, when the battery voltage is low to a certain value, T4 is cut off, and the multivibrator has no power. Stop vibration, no pulse output, output stage does not work. (Continued on page 15) Welcome to order Welcome to welcome to publish product advertisement information * Browse and trace historical data: History of data that needs analysis and retention, curve The form is displayed for easy access.

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Li Jie, lecturer, is mainly engaged in the application of computer teaching and automatic control system software.

Sun Xiaojie, an experimental teacher, is mainly engaged in computer network maintenance and hardware development.

Wu Shaodong, senior experimenter, is mainly engaged in computer network management and hardware development.

(Continued from page 13) In addition, since the turn-on level of the flip-flop is higher than the turn-off level, the state of the device does not reverse when the battery is not charged, that is, the energy-saving lamp does not work, effectively protecting the battery.

In order to improve the luminous efficiency and improve the stimulating effect of light on the human eye, the operating frequency of the energy-saving lamp is generally set between 20 kHz and 30 kHz. The multi-vibrator composed of 555 circuit is used to generate a pulse signal with a frequency between 20 kHz and 30 kHz. In order to achieve the best lighting effect, two adjustment potentiometers W1 and W2 are provided in the circuit to adjust the frequency and duty cycle of the working pulse. Under the same conditions, the highest luminous efficiency is achieved.

Because the voltage specification of the battery is 6V, 12V, 24V, and the working voltage of the lamp is about 100V, it must be boosted and pressured to make the energy saving lamp work. This function can be realized by the output stage consisting of T5, BT and peripheral circuits in the above figure. Driven by the pulse signal from the multivibrator, T5 operates in the switching state, and through the BT transformer, it produces an AC voltage lamp of about 100V in the secondary.

3 Uygur From the above analysis, it can be seen that solar energy-saving lamps use sunlight as an energy source. From the perspective of cost and environmental protection, they have obvious advantages compared with other lighting appliances. Whether it is in areas with high electricity costs and rural areas or economically developed areas, it has greater use value. On the other hand, the energy-saving lamp circuit tends to be mature, and the battery has overcharge and undervoltage protection, low voltage automatic judgment function, and perfect protection function. Solar cell power, battery safety hours, energy-saving lamp power can be freely configured according to their own requirements, simple to make, easy to use, is a very practical energy-saving lamps. I believe that it will soon be popularized.