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Nowadays, the solid-sate lighting technology evolution has changed traditional solutions in lighting. High-Brightness Light-Emitting Diodes (HB-LEDs) have become very attractive light sources due to their excellent characteristics: high efficiency, high life-time and low maintenance. It is evident that HB-LED drivers must be durable and efficient to achieve these advantages. Moreover, for replacing...
Active Power Factor Correctors (PFCs) are needed to design ac-dc power supplies with universal input voltage range and sinusoidal input current. The classical method to control PFCs consists in two feedback loops and an analog multiplier. Hence, the input current is sinusoidal and it is in phase with the input voltage. However, a bulk capacitor is needed to balance the input power and the output power...
When a power factor corrector (PFC) is designed with a fast output-voltage feedback loop, the study of the power stage varies in comparison with the one carried out with a slow output-voltage feedback loop. This is a consequence of the voltage ripple that appears in the control signal. The static behaviour of a PFC with a fast output-voltage feedback loop is studied in this paper using two parameters:...
When a power factor corrector (PFC) is designed with a relatively fast output-voltage feedback loop, the static and the dynamic behaviour of the power stage is different to that obtained with a slow output-voltage feedback loop. This is because of the influence of the voltage ripple that is present on the control signal. This voltage ripple generates a parasitic feedback loop, which is different to...
For years, many authors have done new proposals about the use of single-stage solutions to meet IEC 61000-3-2 regulations. These kinds of topologies can reduce the harmonic content without excessively penalizing the efficiency of the converter. Furthermore, although they are called single-stage topologies, actually, they are not exactly single-stage converters because a part of the energy is processed...
Low cost passive Power Factor Correction (PFC) and Single-Stage PFC converters cannot draw a sinusoidal input current and are only suitable solutions to supply low power levels. PFC preregulators based on the use of a multiplier solve such drawbacks, but a second stage DC/DC converter is needed to obtain fast output voltage dynamics. The output voltage response of PFC preregulators can be improved...
There are several possibilities to transfer the energy taken from a photovoltaic cell to the grid. In the past, several cell modules used the same centralized inverter to transfer the energy to the grid. Nowadays, decentralized modules are preferred because of their versatility to harvest a larger amount of power, even when some of the modules of the total surface are covered and do not receive the...
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