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This paper presents a family of integrated insulated converter to feed power light emitting diodes (LEDs) for street lighting system applications. A Buck, Boost and Buck-Boost converters were used to implement the power factor correction (PFC) and a Flyback converter to perform the power control (PC). The integration between the power stages was made to increase the system reliability by reducing...
This paper proposes a DC-DC step-up converter with a switched capacitor to power light-emitting diodes (LEDs), which may be applied to an autonomous system, e.g. PV system. In the converter is used a small additional inductor operating in discontinuous conduction mode (DCM) which allows zero current switching (ZCS), reducing circuit losses. Moreover, the LED current can be stabilized through the switching...
The use of series-resonant converters (SRC) in light emitting diodes (LEDs) drivers has increased due to its simplicity and high efficiency. Furthermore, the use of SRC provides a reduction of the low frequency (LF) ripple in the LEDs' current, originated by the voltage ripple in the output of the power factor correction (PFC) stage (bus voltage ripple). Thus, the attenuation of the ripple transmission...
This paper presents a discussion about the use of a low frequency boost pre-regulator as offline LED driver and its application to a street lighting LED luminaire. This simple and low cost converter may provide high power factor, low input current distortion, high efficiency and compliance with IEC 61.000-3-2 Class C standard, which limits the emission of harmonic currents of lighting equipment. The...
Almost all luminaires that are used in street lighting system does not have communication, control and management infrastructure. Moreover, the artificial lighting system is responsible for the consumption of approximately 30% of all electricity generated in the world. Within this context, the LED technology offers flexibility and high efficiency, being suitable to be connected with smart devices,...
The understanding of the interrelationships among the photometrical, electrical and thermal (photo-electro-thermal) parameters is extremely important to design lighting systems based on light-emitting diodes (LEDs). This paper proposes an improvement in the estimation of the luminous flux previously proposed in A General Photo-Electro-Thermal Theory (PET Theory), using information taken only from...
This paper presents a three-phase switched capacitor converter to drive power light-emitting diodes (LEDs). The proposed converter does not utilize electrolytic capacitors, providing a high useful lifetime. In addition, the converter does not have diode bridge input rectifier, which can increase the converter efficiency. Moreover, it can stabilize the output current in open loop control, without needing...
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