The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents an electronic ballast topology for HID lamps using differential connection of DC/DC converters. The integration of power factor correction, lamp power control and inverter stages results in a single-stage electronic ballast that supplies the lamp with a low frequency symmetrical square voltage waveform, which avoids both the acoustic resonance phenomenon excitation and the lamp...
This paper presents a method for controlling 119W digitized ultraviolet (UV) lamp electronic ballast with chip microprocessor. With this method, power closed loop can be easily realized and protection can also be carried out correctly when malfunctions including open-circuit and short-circuit state occur. Experimental results show that UV-lamp ignites reliably, harmonic content can be controlled below...
Compact fluorescent lamps are one of the important energy efficient lighting applications. The dimming technology for compact fluorescent systems is available to make this product a more direct replacement for dimmable incandescent applications. This work presents a dimming strategy using Single Ended Primary Inductance Converter (SEPIC) for power factor correction and to dim an integral compact fluorescent...
This paper presents a universal input voltage electronic ballast supplying a 32 W fluorescent lamp. The electronic ballast is formed by a self-oscillating command circuit and an additional circuit. This circuit is used to guaranty the rated power of the fluorescent lamp through the voltage gain variation of the resonant filter. Thus, the switching frequency changes based on feedforward control to...
Arcing can occur in fluorescent lamp sockets due to poor connections. This is a hazardous condition that could cause damage to the socket and is a potential for fire. A circuit is developed to detect when an arc occurs in a self oscillating electronic ballast. The circuit detects the change in frequency that occurs in the resonant circuit when arcing occurs. Based around a digital counter, the developed...
Years of research in the fundamentals of acoustically generated flows in HID arc tubes for enhancement have recently produced record breaking performance in converting wall plug power to useful white light. In this paper simulated results show how power modulation produces straightened arcs. A fully unsteady compressible 2D flow model is used to reproduce observed instantaneous pressure and temperature...
This paper proposes a novel complete electronic ballast for Low Wattage Metal Halide lamps. The lamp driver is based on the integration of a flyback PFC input stage and a buck-boost inverter stage. The resulting circuit supplies the lamps properly, operating from the mains facility. The main feature of the proposed ballast is that through an adequate integration of the stages, the ballast operates...
In this paper, the fundamental approximation combined with a time-varying phasor transformation is applied to obtain an envelope model of a phase-controlled triple LCpCs resonant inverter. The resulting model removes the high-frequency component while keeping the useful information contained in the waveform envelopes. The method provides large and small-signal Spice compatible models in a straightforward...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.