Electronic ballast with crest factor correction In those conventional arts, the low cost electronic ballast with high power factor does not have the capability of regulating the lamp current and so the life span of the lamp is shortened. Moreover, the cost of the electronic ballast having the capable of high power factor and regulating the lamp current simultaneously is...more
Variable impedance electronic ballast for a gas discharge device This invention relates to an electronic ballast for driving a set of gas discharge lamps which is capable of driving the lamps independently of lamp loading, i.e., with less than all of the lamps in the set connected or operating, and in a transition period during which a lamp already connected stops or...more
Self-regulating, no load protected electronic ballast system This invention is directed to an electronic ballast system for fluorescent or gas discharge tubes. In particular, this invention relates to automatic gain controlled ballast systems for fluorescent tubes. Still further, this invention relates to an electronic ballast system which limits the voltage output to fluorescent or gas discharge tubes when the output voltage of the power source increases. This invention limits the output voltage of the electronic ballast system and substantially reduces such when the gas discharge tube or fluorescent tube is electrically removed from the overall circuit. More in particular, this invention pertains to a no load protection transformer being series coupled to an induction circuit for preventing the generation of voltages above a predetermined value when the gas discharge or fluorescent tube is electrically removed from the circuit. More in particular, this invention relates to an electronic ballast system where a primary winding of a no load protection transformer forms a variable inductance which is inversely...more
Electronic ballast having a flyback cat-ear power supply Electronic ballast for fluorescent lamps typically include a "front end" and a "back end". The front end typically includes a rectifier for changing alternating-current (AC) mains line voltage to a direct-current (DC)...more
Electronic ballast having improved power factor and total harmonic distortion Electronic ballast for fluorescent lamps typically can be analyzed as comprising a "front end" and a "back end". The front end typically includes a rectifier for changing alternating current (AC)...more
Sequential feedback control system for an electronic ballast Feedback control systems are used to control electronic ballast because they provide effective control despite irregular characteristics of lamp loads, and because they are effective for reducing energy consumption and extending lamp life.A sequential feedback control system that can implement soft start and dimming operations provides further benefits in terms of energy efficiency and extended lamp life. During a soft start operation, a lamp is driven at a reduced power level during a preheat cycle before the entering a discharge mode. This reduces the stress on the filament and extends the lifespan of the lamp. The power to the lamp is then increased until it enters a discharge mode. After a sufficient period during which the discharge is maintained, the power can be reduced during a dimming operation to adjust the brightness of the lamp commensurate with the ambient lighting conditions, thereby conserving power. A sequential control system employing feedback can adapt the power flow to the changing load conditions presented by a lamp as it is...more
Dimmable electronic ballast Fluorescent lamps are controlled by an electronic ballast that provides the necessary ignition voltage for the discharge that provides the...more
Power Protection Devices for the Safety of Sensitive Electronic Devices Ongoing requirement of electrical power to run electrical and electronic devices has put extra load on...more
New and Used Forklift Maintenance - Daily Safety Checks For Forklifts Depending on the situation, it may also require checks if there is a shift or driver change. This daily...more
Ensure Overall Safety of Electronic Devices with Power Protection Devices Sudden power fluctuation, spikes, surges, sags, etc., that occur in power lines sometimes create some...more
Uninterruptible Power Supplies for Sufficient Power Backup and Safety of Devices High quality, uninterrupted and reliable power supply is vital for mission critical...more
Sanitaire SYSTEM PRO S677B Blue Line Upright Vacuum Cleaner Plus a Mighty Mite Canister - by Electrolux The combination of the Sanitaire Upright Vacuum cleaner and a Mighty...more