Due to the advent of high-brightness blue LEDs, white LEDs can be easily obtained using a combination of phosphors and blue LEDs. At present, white LED has become the main backlight light source of portable information products, and it may even become a general household light source in the future. In addition, high-power near-ultraviolet LEDs have appeared in recent years. The same phosphors can be turned into white LEDs. The characteristics of LEDs are small size, low power consumption, and long life. If they have the characteristics of color design freedom, stability, and easy handling, etc. When the phosphor is combined, it can become a new lighting source.
Generally, when combining LED and phosphor, the typical method is to place the phosphor near the LED. The main reason is that the phosphor can efficiently convert the light generated by the LED to a wavelength, and the phosphor is placed in a region with a high light emission density. , Is the easiest method for wavelength conversion. In addition, the phosphor packaging method determines the luminous efficiency and hue of the white LED. Therefore, the packaging technology of the LED and the phosphor will be discussed in depth from the perspective of white light.
White LED package of blue LED + YAG phosphor
It is a commercially available white LED. Specifically, it disperses YAG: Ce phosphor that can produce yellow light in a transparent epoxy resin, and then uses the blue LED in the bowl to excite the light and convert it into White light. The white light emission mechanism of this method is to use LEDs to generate blue light. Part of the blue light will excite the YAG phosphor to become yellow light. The remaining blue light will be mixed externally with blue light and yellow light to become white light. The feature of this method is that the structure is simple, and only the phosphor coating process needs to be added to the production process of the LED, so the production cost can be greatly suppressed, and the other feature is that the chromaticity adjustment is very simple.
As long as the color coordinate is within the straight line formed by the two color coordinates of the LED and the YAG phosphor, the color tone can be adjusted arbitrarily. It can be seen that when the concentration of the YAG phosphor is low, the ratio of blue penetration light is large, and the overall Blue tone white light; relatively, if the YAG phosphor concentration is higher, the ratio of yellow converted light is more, and the whole is yellow tone white light.
As mentioned above, using some blue LEDs as complementary colors does not require high-density (percentage of resin) phosphor coating, so it can effectively reduce the amount of phosphor used. Generally speaking, although the percentage of phosphor to resin will change with the conversion efficiency of YAG phosphor and the shape of bowls and cups, white light can be obtained with a low mixing ratio of about 10 to 20 wt%. In addition, due to the light intensity emitted by the blue LED, the distribution on the central axis is not the same as the surrounding. Even if the density of the YAG phosphor around the LED chip is completely the same, it will still cause problems such as uneven light on the axis and the surrounding, which is also necessary in the future. One of the problems overcome.
Lead Frame Type and Chip Type both set blue LEDs in bowls and cups, and then coat with resin mixed with a certain amount of YAG phosphor. Because LEDs have the characteristics of small size, power saving, and long life, they have been widely used in backlighting light sources of portable information products such as mobile phones and PDAs, as well as trail guide lights and other fields.
The main function of the Solar Charge Controller is to manage the charging and discharging process between the Solar Panel and the battery in the solar power generation system. Its main function is to protect the battery from overcharge and over-discharge damage, ensure battery charging efficiency, and stabilize the operation of the solar power generation system.
Main effect:
Charge control: The solar charge controller controls the charging process by monitoring the voltage and current generated by the solar panel to ensure that the battery is charged at the appropriate voltage and current to extend the battery life.
Overcharge protection: The solar charge controller can monitor the charging status of the battery, and when the battery is fully charged, it will automatically stop charging to avoid battery damage caused by overcharging.
Over-discharge protection: The solar charge controller can monitor the discharge state of the battery. When the battery power is lower than a certain level, it will automatically stop discharging to avoid battery damage caused by over-discharge.
Differences from other charge controllers:
The solar charge controller is a charge controller specially designed for solar power generation systems, the main differences are as follows:
Applicable Energy: The solar charge controller is suitable for solar power generation systems, mainly used to manage the charging and discharging process between solar panels and batteries. While other charge controllers may be suitable for different energy generation systems, such as wind energy, hydro energy, etc.
Charging characteristics: The solar charge controller is optimized for the characteristics of the solar panel, and can control the charging process according to the output power and voltage characteristics of the solar panel. Other charge controllers may be optimized for different types of energy generation characteristics.
Protection function: Solar charge controllers usually have overcharge protection and over-discharge protection functions to ensure the safe charging and discharging of batteries. Other charge controllers may have different protection functions, depending on the needs of the application scenario.
Overall, the main role of the solar charge controller is to manage the charging and discharging process in the solar power generation system, protect the battery from damage, and stabilize the system's operation. Compared with other charge controllers, it is optimized for the characteristics of solar power generation systems and has unique functions such as overcharge protection and over-discharge protection to meet the needs of solar power generation systems.
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