[Source: High-tech LED 's " LED Good Products" magazine February issue ]
Indoor lighting LED lamps, the cost of innovation in packaging technology for LED lamp beads has dropped drastically; the cost of LED driver power supply has been reduced due to the high integration, simple application of PSR isolation and non-isolated switching constant current power supply technology, and high voltage linear constant current power supply technology. It has also fallen sharply; the involvement of high thermal conductivity plastic heat sinks provides new safety technologies for the use of non-isolated power LED luminaires. Therefore, the affordable LED lighting fixtures required for mass lighting will be rapidly developed in 2013, and it is expected to reach the peak of production and marketing in 2014 and 2015. Affordable lighting fixtures are a new generation of energy-saving lighting fixtures that are affordable to the world's civilian population. It will be the largest production and demanding product in modern electronics. Chinese and foreign LED industry chain manufacturers are all gearing up, actively responding, competing to develop related products, and strive to squeeze into this massive market, try to ingest as much market share as possible.
PF (power factor) and THD (total harmonic distortion)
The driving power of LED lighting fixtures pursues high PF (Power Factor) and low THD (Total Harmonic Distortion), which are both the customer's hope and the power system requirements. The ENERGY STAR and International Telecommunications Commission (ICE) specification LED driver ICs must have high power factor correction (PFC) to ensure conversion efficiency and lamp life for LED luminaires.
The power factor PF is the ratio of active power to apparent power. The power factor is related to the load characteristics of the circuit. For example, the power factor of the resistive load such as incandescent bulb and resistance furnace is 1. The power factor of the circuit with inductive load is generally less than 1. Power factor is an important technical data of the power system and a factor to measure the efficiency of electrical equipment. The low power factor indicates that the reactive power of the circuit for alternating magnetic field conversion is large, thereby reducing the utilization rate of the device and increasing the power loss of the line. The fundamental reason for the low power factor is the presence of inductive loads, such as switching power supplies used in LED driving, switching constant current sources are inseparable from transformers and inductors, and electrolytic capacitors. Since the power factor represents the proportion of active power in the total power, the power factor of any luminaire cannot be greater than one.
LED lamps and lanterns must rely on DC voltage and DC current for normal operation. Therefore, LED lamp beads must be given a constant DC current for the lamps to illuminate stably and safely.
LED lamps, after AC mains input, are rectified by the bridge stack to obtain the pulsating DC voltage. If the pulsating voltage is not processed, it will be directly supplied to the LED lamp bead. The residual AC component in the pulsating DC will make the LED illuminate. The flashing occurs and the LED fixtures are not working properly. Although the power factor of the luminaire is close to 1, the illuminating effect is unacceptable. In order for the luminaire circuit to function properly, it must be supplied with a "smooth" DC voltage. This "smoothing" operation must be done by a filter capacitor connected to the luminaire's AC rectifier. This filter acts like a reservoir. The capacitor must store a sufficient amount of charge. When rectifying the gap between the half waves, the operating voltage on the circuit is still uninterrupted and can maintain a normal level. That is to say, even if there is no input energy between the two pulsating half waves, the voltage level of Uc does not change significantly. This function is realized by the energy storage in the capacitor, and the energy stored in the capacitor. It is reactive power. Therefore, LED lamps are supported by reactive power to ensure that the circuit correctly uses active power for normal use. Therefore, LED lamps not only need active power, but also reactive power, both of which are indispensable. The operating frequency of the residual switching power supply in the power supply loop and the power frequency and frequency multiplication of the power grid cause total harmonic distortion.
Unfinished
For more information, please refer to the February issue of Gaogong LED 's " LED Good Products" magazine.
Indoor lighting LED lamps, the cost of innovation in packaging technology for LED lamp beads has dropped drastically; the cost of LED driver power supply has been reduced due to the high integration, simple application of PSR isolation and non-isolated switching constant current power supply technology, and high voltage linear constant current power supply technology. It has also fallen sharply; the involvement of high thermal conductivity plastic heat sinks provides new safety technologies for the use of non-isolated power LED luminaires. Therefore, the affordable LED lighting fixtures required for mass lighting will be rapidly developed in 2013, and it is expected to reach the peak of production and marketing in 2014 and 2015. Affordable lighting fixtures are a new generation of energy-saving lighting fixtures that are affordable to the world's civilian population. It will be the largest production and demanding product in modern electronics. Chinese and foreign LED industry chain manufacturers are all gearing up, actively responding, competing to develop related products, and strive to squeeze into this massive market, try to ingest as much market share as possible.
PF (power factor) and THD (total harmonic distortion)
The driving power of LED lighting fixtures pursues high PF (Power Factor) and low THD (Total Harmonic Distortion), which are both the customer's hope and the power system requirements. The ENERGY STAR and International Telecommunications Commission (ICE) specification LED driver ICs must have high power factor correction (PFC) to ensure conversion efficiency and lamp life for LED luminaires.
The power factor PF is the ratio of active power to apparent power. The power factor is related to the load characteristics of the circuit. For example, the power factor of the resistive load such as incandescent bulb and resistance furnace is 1. The power factor of the circuit with inductive load is generally less than 1. Power factor is an important technical data of the power system and a factor to measure the efficiency of electrical equipment. The low power factor indicates that the reactive power of the circuit for alternating magnetic field conversion is large, thereby reducing the utilization rate of the device and increasing the power loss of the line. The fundamental reason for the low power factor is the presence of inductive loads, such as switching power supplies used in LED driving, switching constant current sources are inseparable from transformers and inductors, and electrolytic capacitors. Since the power factor represents the proportion of active power in the total power, the power factor of any luminaire cannot be greater than one.
LED lamps and lanterns must rely on DC voltage and DC current for normal operation. Therefore, LED lamp beads must be given a constant DC current for the lamps to illuminate stably and safely.
LED lamps, after AC mains input, are rectified by the bridge stack to obtain the pulsating DC voltage. If the pulsating voltage is not processed, it will be directly supplied to the LED lamp bead. The residual AC component in the pulsating DC will make the LED illuminate. The flashing occurs and the LED fixtures are not working properly. Although the power factor of the luminaire is close to 1, the illuminating effect is unacceptable. In order for the luminaire circuit to function properly, it must be supplied with a "smooth" DC voltage. This "smoothing" operation must be done by a filter capacitor connected to the luminaire's AC rectifier. This filter acts like a reservoir. The capacitor must store a sufficient amount of charge. When rectifying the gap between the half waves, the operating voltage on the circuit is still uninterrupted and can maintain a normal level. That is to say, even if there is no input energy between the two pulsating half waves, the voltage level of Uc does not change significantly. This function is realized by the energy storage in the capacitor, and the energy stored in the capacitor. It is reactive power. Therefore, LED lamps are supported by reactive power to ensure that the circuit correctly uses active power for normal use. Therefore, LED lamps not only need active power, but also reactive power, both of which are indispensable. The operating frequency of the residual switching power supply in the power supply loop and the power frequency and frequency multiplication of the power grid cause total harmonic distortion.
Unfinished
For more information, please refer to the February issue of Gaogong LED 's " LED Good Products" magazine.
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