“In order to solve the environmental pollution caused by industrial development and resolutely implement the sustainable development advocated by the national government, green energy is now receiving more and more attention, especially solar energy. As a green energy source, it is pollution-free and energy-saving. Electromagnetic induction lamp is also a green light source, long life and high luminous efficiency can save a lot of electricity and maintenance costs. In this paper, combining the advantages of the two, the LVD type solar electromagnetic induction lamp is developed.
In order to solve the environmental pollution caused by industrial development and resolutely implement the sustainable development advocated by the national government, green energy is now receiving more and more attention, especially solar energy. As a green energy source, it is pollution-free and energy-saving. Electromagnetic induction lamp is also a green light source, long life and high luminous efficiency can save a lot of electricity and maintenance costs. In this paper, combining the advantages of the two, the LVD type solar electromagnetic induction lamp is developed.
2 The principle of LVD solar electromagnetic induction lamp
As shown in Figure 1: The structure of the LVD solar electromagnetic induction lamp is mainly divided into 4 modules. The first is a solar battery module to realize the conversion of solar energy to electric energy; the second is a control circuit to control solar cells and storage batteries. Between charging and discharging, the battery supplies power to the load, and the protection and control of the safe operation of the system; the third part is the battery, and the electric energy converted from solar energy is stored in the battery; the fourth part is the electromagnetic induction light source. The four parts are introduced below.
2.1 Solar cells
Solar cells are devices that can convert sunlight into voltage. They have one thing in common, that is, input specific light to these devices, and a photoelectric effect will occur to convert light energy into electrical energy. As shown in Figure 2, the solar cell is formed by pressing two different doped materials to form a pn junction. Under the irradiation of the characteristic wavelength of sunlight, a certain potential difference will be formed between the n region and the p region. This potential difference Determines the large supply voltage of the battery. If the battery is connected up and down to form a loop, the solar battery can supply power to the load.
In principle, as long as the solar battery and the load are directly connected to the load to supply power, the load can work, but in fact, because the solar energy is constantly changing, on the one hand, the power supply time and the load working time may be inconsistent, on the other hand, the load often needs to be It can only work under a certain voltage, and solar cells do not have the ability to provide a constant voltage, so all solar power systems now work with batteries.
For the specific product of light source, LVD electromagnetic induction lamp with solar battery has its unique advantages. Because we know that although solar energy is a green free energy source, the cost of solar cells is very expensive. However, the voltage provided by commonly used solar cells is only about 0.5V. Therefore, in order to make the gas discharge light source work, it is necessary to connect a large number of solar cells in series to provide sufficient voltage, which is very expensive. The LVD electromagnetic induction lamp can work at a very low voltage (it can work normally at 150v), which can greatly reduce the number of solar cells and reduce the cost of the system.
2.2 Control circuit
The control circuit is the center of the system’s work, and its main functions are:
2.2.1 Charge and discharge of the control system
When charging, when the solar battery charges and discharges the storage battery, the electric energy of the storage battery supplies power to the load. Of course, the voltage of the battery is far from meeting the requirements of the load, and the control circuit will boost the output voltage of the battery.
2.2.2 Timed work
The working time of the system can be automatically set. When the battery power is insufficient or the output voltage is too low, the load is automatically cut off and the solar battery is controlled to charge the battery.
2.2.3 Protection function
The control circuit can realize the protection of the system. When the system has problems, such as load short circuit, open circuit, battery reverse connection, overcharge, etc., it will automatically cut off line 3.
The solar battery mentioned above cannot directly supply power to the load. The electric energy must be stored in the storage battery. The storage battery supplies power to the load, but the voltage of the storage battery cannot be applied to the solar battery. It must be ensured that the charging between the solar battery and the storage battery is one-way . A very simple method is to add a diode between the solar cell and the battery, as shown in Figure 3.
2.2.4 LVD electromagnetic induction lamp
LVD induction electrodeless fluorescent lamp is a new type of light source made by the principle of H-type discharge. Its structure is composed of a high-frequency generator, a power coupling coil, and an electrodeless fluorescent tube. The high-frequency energy generated by the high-frequency generator is coupled to the plasma in the lamp tube through the power coupling coil, which excites the plasma and converts the light through the phosphor.
The battery power is boosted to power the LVD electromagnetic induction lamp. Because the high-frequency generator of the LVD electromagnetic induction lamp has a boost circuit inside, it greatly reduces the power supply voltage requirements of the battery. The system only needs to provide 150v Voltage, LVD electromagnetic induction lamp can work normally. This allows the number of solar cells required by the system to be greatly reduced, and the cost is also reduced.
3 Application examples
The electromagnetic induction lamp using 80w solar battery can work for about 5 hours per night under the rated power of 40w under the annual average sunshine condition, which can basically meet the requirements of night lighting. If the LVD solar electromagnetic induction lamp is combined with the city power supply, when the battery power is sufficient, it will be powered by the solar battery, and when the battery power is insufficient, it will be powered by the city power supply, which can greatly improve the stability and scope of application of the system.
LVD solar electromagnetic induction lamp closely integrates solar technology and induction lamp technology, makes full use of the advantages of both parties, and is a new energy-saving and environmentally-friendly product. Another advantage of its application in the lighting field is that it can greatly simplify the cumbersome lighting wiring problem, and each light source is an independent working system. With the continuous development of solar technology and induction lamp technology, the performance of this new product will definitely continue to improve, and it will do a lot in the future lighting field.