ENERGY SAVING DEVICE FOR PUBLIC LIGHTING SYSTEM AND METHOD THEREOF

摘要

This invention is referred to an energy saving device which supplies the hig h efficiency sodium steam lamps and a method providing additional savings of electrical energy by means of the temporary reduction in the luminous flow o f a high efficiency sodium steam lamp. The energy saving device includes in its operation protection against low voltage supply, regulation of supply voltag e and protection in absence or damage of the lamp. In turn, the method includes a sequence for a reliable ignition of the lamp, a modulation routine in frequency for elimination of acoustic resonance and an automatic turn off sequence in view of damage of the photocell which is a consequence in this type of devices, as well as a consumption detection system to keep the output power steady and therefore, keep the power consumption under a steady value.