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1.What is PF? What is PFC? Why choices high PF?
PF is the abbreviation of Power Factor, which refers to the power factor, which is the ratio of active power to apparent power;
PFC is an abbreviation for Power Factor Corrector, which refers to power factor correction;
High power factor can:
(1) Reduce current harmonics;
(2) increase the capacity of the power system;
(3) Reduce line loss and save electric energy.
Low power factor represents low power efficiency, the lower the power factor value represents the higher proportion of electricity consumed in the distribution network, if the low power factor is not corrected, the power company in addition to the active power, but also to provide greater reactive power, which leads to the need for larger generators, transformers, transmission lines, etc., to compensate for losses. Power supplies with PFC function can improve their own energy utilization, reduce losses, and reduce harmonic pollution to the grid.
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2.Why do LEDs need high-quality drive?
LED driver is the key to LED lighting fixtures, it is like a person's heart.
To manufacture high-quality LED lightings, high-quality LED drivers must be applied, in order to meet the high standard of harsh working environment and maintenance costs.
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3.How to ensure the quality and reliability of LED drivers?
(1) Standardized professional design process control: technical pre-research, feasibility assessment, preliminary design, detailed design, engineering prototype, small batch trial production.
(2) Reasonable component design margin
(3) Selection of high-quality components: electrolytic capacitors, ICs, power semiconductors, magnetic components, etc.
(4) Strict quality verification and testing procedures : stress analysis, EVT, SVT, DVT and other tests and MTBF calculations and experimental verification.
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4.How to judge whether the LED driver can be used to make flicker-free lightings?
When the outpput ripple current is less than 10%,the driver can only produce flicker-free lightings.
If the ripple current greater than 10%-20% , or more than 20-100%, the driver can only produce lightings with flicker.
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5.Why does the LED drive need to be filled?
LED driver filling is beneficial for thermal conductivity and waterproofing:
(1) Through glue filling, the heat of the component can be exported and dissipated through the shell, so that the internal temperature is uniform and the overall temperature is reduced.
(2) The inside of the driver is filled by glue, and the infiltration of water molecules is reduced and the waterproof performance is improved through the cooperation with structural parts such as the shell, so as to improve the outdoor adaptability of the LED driver.
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