Showing papers by "J.M. Alonso published in 1994"
02 Oct 1994
TL;DR: In this paper, a low cost and reliable high frequency supply system, an electronic power transformer, for low power halogen cycle lamps based on a self-oscillating half bridge inverter is described.
Abstract: Halogen cycle lamps are being used for outdoor and indoor lighting. For indoor lighting, low power halogen cycle lamps are used. When lamp power is below 50 W, it is not possible to connect these lamps directly to power lines because they need a low input voltage, between 6 V and 24 V. Traditional supply equipment for low power halogen lamps are 50/60 Hz transformers, but they have large size and weight. A low cost and reliable high frequency supply system, an electronic power transformer, for low power halogen cycle lamps based on a self-oscillating half bridge inverter is described in this paper. Compared with a 50 Hz transformer, weight and size have been minimized. Moreover a high power factor, more than 0.9, has been achieved, and the circuit is both reliable and flexible. >
13 citations
05 Sep 1994
TL;DR: This paper proposes to study the use of several zero-current-switched quasi-resonant power converters with a half-wave switch, working as power factor preregulators (PFP) with voltage-following control, showing excellent characteristics for obtaining high power factor without using any input current feedback loop.
Abstract: In this paper, the authors propose to study the use of several zero-current-switched quasi-resonant power converters (flyback, SEPIC and Cuk) with a half-wave switch, working as power factor preregulators (PFP) with voltage-following control. The analysis carried out demonstrates that these power converters show excellent characteristics for obtaining high power factor without using any input current feedback loop. They also allow high switching frequency operation because they integrate transformer and rectifier diode parasitics into the power topology. >
6 citations
21 Aug 1994
TL;DR: In this article, the use of a zero current switched-quasi resonant (ZCSQR) SEPIC (single ended primary inductance converter) with half-wave switch working as a power factor preregulator is studied.
Abstract: The use of a zero current switched-quasi resonant (ZCSQR) SEPIC (single ended primary inductance converter) with half-wave switch working as a power factor preregulator (PFP) is studied in this paper. The analysis carried out demonstrates that this converter shows excellent characteristics to obtain a high power factor without using any input current feedback loop and also that it allows high switching frequency to operate because it integrates transformer and rectifier diode parasitics into the power topology.
1 citations