PFC-SEPICLED driver PFC stands for "Power Factor Correction", SEPIC stands for "Single-Ended Primary Inductor Converter", of course, LED stands for "Light Emitting Diode" Integrating these three features in a single converter provides a high-efficiency, single-stage solution with good power factor for LED lighting. Figure 1 is a schematic diagram of a PFC-SEPICLED driver. Figure 1. PFC-SEPIC converter can be controlled using a conventional PFC boost controller An important feature of SEPIC is the lack of isolation. This structure can only be used in applications that do not require secure isolation. Think of a completely sealed application where users cannot access energized components such as street lights and high ceiling lights. Most PFC converters use a boost topology that requires an output voltage that is higher than the peak line voltage. The SEPIC topology allows the output voltage to be higher or lower than the input voltage. This helps the controller to directly regulate the current in the LED string without the need for a secondary power stage. Any PFC boost controller can be used to drive the PFC-SEPIC power stage. This is because the power switch is on the low side as it is in the boost topology. The PFC boost controller forces the peak current in the switch to follow the input voltage sine wave, thus providing a good power factor. Unlike the boost topology, in the coupled inductor SEPIC, no input current flows when the switch is turned off. Therefore, the power factor is not as high as in the boost topology. However, the power factor is easily maintained above 0.9, which is sufficient for most lighting applications. Figure 2 is an example of line voltage and current and current harmonics, where the harmonics remain below the EN61000-3-2C requirements. Figure 2. This topology not only provides good power factor, but also meets EN61000-3-2C standards. Extremely efficient with this topology because: 1. Using a single stage to achieve PFC, power conversion and voltage regulation, can eliminate the disadvantages of double or triple conversion; 2. SEPIC's clamp capacitors retract the leakage energy in the coupled inductor, saving 2% energy or increasing efficiency compared to the flyback topology. Plate non-damaged desulfator with Smart pulse, Simple and Safe, Restore your battery when charging.
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EV Battery Charging Restorer EV Battery Charging Restorer,Electric Motorcycle Battery Restorer,EBike Power Battery Repair,Electric Cycle Battery Repair Shenzhen Daceen Technology Co., Ltd. , https://www.daceen-sz.com
Most of Electric vehicle use lead-acid battery bank(12V /6V /8V cells packed in Series)as the power source, The design lifespan of battery is 2~3 years, but actually the battery is usually failure after 6~12 months used which State-of-capacity gradually decline and even some scraped. Through analysis by cutting a large number of failure batteries, the battery water loss and sulfation is quite prominent. Such as the phenomenon of battery sulfation and water dehydration can be effectively inhibited to prolong the service life greatly up to 2 times.
EV Battery Charging Restorer is a new generation of high-tech products developed specifically for restoring Electric vehicle battery when it is charging every time, it utilizes the energy from the charger when charging, generating electronic smart pulse with special frequency to be resonance with the thick lead sulfate crystals in battery charging process. Under the disturbance by the specific frequency pulse, the recrystallization of lead sulfate can be prevented effectively
2. The connection with charger is simple, safe and convenient, and Smart Pulse Charging Restorer can be used in conjunction with the charger for each charging process. The problem of sulfation of the plate can be eliminated during every charging process.
3.It smartly identify 72V/60V/48V/36V battery bank Spec, automatically adapt to precise voltage, automatically adjust the restore electric pulse.This Battery pulse maintainer is suitable for the popular 72V~36V batteries of electric vehicles, buy a set, multi vehicles benefit in family.
4. A strict circuit filtering technique, does not repair your charger as a pulse, without changing the structure of the charger, does not affect the charging parameters of the charger, safe and carefree.