Antonio J. Calleja

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Due to the high rise in luminous efficiency that HBLEDs have experienced in the last recent years, many new applications have been researched. In this paper, a streetlight LED application will be covered, using the Integrated BuckFlyback Converter developed in previous works, which performs power factor correction (PFC) from a universal ac source, as well(More)
The first LED diode was created in 1969. Since then, they have been experiencing a continuous improvement in luminous efficiency and power dissipation, achieving current AIInGaP and InGaN devices for yellow to red, and blue to green, including white, colours respectively. The improvement experienced in both luminous efficiency and power dissipation makes(More)
This paper proposes an electronic driver for public lighting systems. The input stage is based on the integration of two flyback converters with different polarities, in order to avoid the use of the input diode bridge rectifying stage. The output stage is a boost converter with an output current control. The proposed circuit is introduced and analyzed, and(More)
In this paper a new technique to reduce the LED current ripple and storage capacitance in high power factor (PF) off-line LED power supplies is investigated. The proposed methodology is based on the use of integrated power converters (IPC) to implement the power supply. Thus, the first stage operates in discontinuous conduction mode (DCM) to provide high(More)
This paper presents an off-line integrated full ballast to supply a 35 W assembly of Power LEDs. The proposed solution integrates an input PFC stage (a flyback converter operating in DCM) and a DC-DC output converter (a buck converter) into a single switch power stage, operating with peak current control. As it will be shown, this control scheme maintains(More)
Acoustic resonances (AR) appear in High Frequency operation of metal halide lamps. Among the supply techniques to minimize this phenomenon, high frequency non resonant (HFNR) inverters appear as a suitable approach. Unfortunately, the effect of the necessary series igniter causes the lamp waveforms not to be perfectly square. This behavior inserts frequency(More)
This paper proposes a novel complete electronic ballast for low-wattage metal halide (LWMH) lamps. The lamp driver is based on the integration of a flyback power factor correction (PFC) input stage and a buck-boost inverter stage. The resulting circuit supplies the lamps with a high-frequency (HF) square current waveform, operating from the mains facility.(More)