[Source: "High-tech LED - Technology and Applications" February issue of Yan Chongguang]
The illuminator LED lamp bead technology of LED illumination source evolved from low voltage LED (LV LED) to evolved two series of AC LED (AC LED) and HV LEDs (High Voltage LED). Today, LV LEDs, ACLEDs, and HV LEDs are racing at the same time. LV LED has a low operating voltage due to its VF of 3.2 VDC. When using AC mains, the efficiency is difficult to improve. The IF operating current is large and requires 300-700 mA. Therefore, the heat dissipation problem of LV LED lamps is always a technical bottleneck. The final solution has not been found for many years, so the application cost is difficult to further decline, affecting its entry into the massive general lighting market. The dispersion of AC LEDs is too large and the high application cost affects their use as a general lighting source.
The VF voltage of HV LEDs is relatively high, usually 45V--70VDC, IF is 20-40mA. As the light source of lighting fixtures, the efficiency of utility power supply will be greatly improved, and the heating of HV LEDs will also be greatly reduced due to the operating current. Small but decreased. Therefore, in 2012, HV LEDs will emerge as a new generation of LED light sources, rapidly expanding their applications in indoor lighting fixtures such as LED bulbs and recessed downlights. The LED family's up-and-coming high-voltage LEDs (HV LEDs), VF high-voltage, IF low-current operating conditions completely subvert the traditional low-voltage LED (LV LED) VF low voltage, IF high current work requirements. LED lighting fixtures use SOC of HV LEDs, and adopt a new generation of linear constant current power supply driver chip, which may reduce the heat generation of the entire LED lighting fixture. The structure of the lamp may be more likely to save heat-dissipating materials, more than 270 degrees of illumination, Reduce costs and reduce weight development.
Conventional LV LEDs use a low-voltage constant current source to drive illumination; ACLED uses AC LED light source as a rectification and illuminant solution, AC LEDs require longer afterglow; HV LEDs use high-voltage constant current sources to drive HV LEDs.
New linear constant current power supply chip EXC100
The EXC100 is a new generation of innovative linear constant current power driver ICs. The integrated linear constant current source circuit is simple and the switching circuit has high conversion efficiency. The typical application system diagram is shown in Figure 1. The driver chip is directly powered by AC mains rectification and supports 110V and 220V mains grid voltage applications.
The illuminator LED lamp bead technology of LED illumination source evolved from low voltage LED (LV LED) to evolved two series of AC LED (AC LED) and HV LEDs (High Voltage LED). Today, LV LEDs, ACLEDs, and HV LEDs are racing at the same time. LV LED has a low operating voltage due to its VF of 3.2 VDC. When using AC mains, the efficiency is difficult to improve. The IF operating current is large and requires 300-700 mA. Therefore, the heat dissipation problem of LV LED lamps is always a technical bottleneck. The final solution has not been found for many years, so the application cost is difficult to further decline, affecting its entry into the massive general lighting market. The dispersion of AC LEDs is too large and the high application cost affects their use as a general lighting source.
The VF voltage of HV LEDs is relatively high, usually 45V--70VDC, IF is 20-40mA. As the light source of lighting fixtures, the efficiency of utility power supply will be greatly improved, and the heating of HV LEDs will also be greatly reduced due to the operating current. Small but decreased. Therefore, in 2012, HV LEDs will emerge as a new generation of LED light sources, rapidly expanding their applications in indoor lighting fixtures such as LED bulbs and recessed downlights. The LED family's up-and-coming high-voltage LEDs (HV LEDs), VF high-voltage, IF low-current operating conditions completely subvert the traditional low-voltage LED (LV LED) VF low voltage, IF high current work requirements. LED lighting fixtures use SOC of HV LEDs, and adopt a new generation of linear constant current power supply driver chip, which may reduce the heat generation of the entire LED lighting fixture. The structure of the lamp may be more likely to save heat-dissipating materials, more than 270 degrees of illumination, Reduce costs and reduce weight development.
Conventional LV LEDs use a low-voltage constant current source to drive illumination; ACLED uses AC LED light source as a rectification and illuminant solution, AC LEDs require longer afterglow; HV LEDs use high-voltage constant current sources to drive HV LEDs.
New linear constant current power supply chip EXC100
The EXC100 is a new generation of innovative linear constant current power driver ICs. The integrated linear constant current source circuit is simple and the switching circuit has high conversion efficiency. The typical application system diagram is shown in Figure 1. The driver chip is directly powered by AC mains rectification and supports 110V and 220V mains grid voltage applications.
Figure 1 EXC100 typical application diagram
For more information, please refer to the February issue of "High-tech LED-Technology and Applications" magazine.
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