Class 315/256 - Primaries in series

Subclass of Class 315 - Electric lamp and discharge devices: systems
Definition: Systems wherein two or more of the load devices each have
No. of patents: 27
Last issue date: 12/20/2011

Number	Title	Issue Date
8080945	Multiple lamp driving device comprising balance transformer The present invention provides a multiple lamp driving capable of being applied to a multiple lamp system such as an LCD, wherein the multiple lamp driving device includes: a power supply unit for supplying a driving voltage to a lamp unit provided with first to 4nt...	12/20/2011
7262558	Lamp current control device A lamp current control device includes an electronic power switch, a transformer, a current transformer and a pulse width modulation (PWM) IC. The transformer has its primary side connected to the electronic power switch and a secondary side connected to a lamp. The...	08/28/2007
7199529	Inductive lighting system with back-up battery A pathway lighting system has self-contained, battery up scaled lighting modules (20), each module including at least one secondary coil. A plurality of primary coils are housed within a carrier assembly (1) together with voltage circuitry (14)....	04/03/2007
7102298	Integral lamp An integrated lamp/lamp electronics unit includes a lamp having a first end with first end electrical terminals, and a second end with second end electrical terminals. An end cap having an interior section is placed into electrical connection with the first end elec...	09/05/2006
6486618	Adaptable inverter A DC-AC inverter that is adaptable for use with different input voltages and for use with different loads. The DC-AC inverter has a voltage-step-up network, with the step-up voltage set by a controller that drives totem-pole configured FET switches at a d...	11/26/2002
6300878	Constant current regulator using IGBT control A constant current regulator that receives an AC input current from a source provides a constant AC current to a load. The regulator includes first, second, third, and fourth electronically controllable switches, a transformer coupled to the switches, and...	10/09/2001
6232726	Ballast scheme for operating multiple lamps A ballast including a single sense element and a single controller for mulitple lamp operation. The ballast avoids the need for separate feedpaths for sensing individual lamp conditions and/or the need for separate controllers for controlling the individu...	05/15/2001
5625260	Systems and methods for transmitting pulse signals The invention relates to a method and system for communicating from the secondary side of an isolation transformer (6) to receiver means, the primary of said transformer being connected via a power cable to a circuit fed with a periodic voltage from a con...	04/29/1997
5239236	Field lighting network with a distributed control system A field lighting network providing for individual control of the light fittings while reducing overall cable costs. A converter unit converts a supply voltage obtained from an A.C. main to a substantially constant current in a Boucherot circuit with a ser...	08/24/1993
5168198	Lamplight failure detection system A lamplight failure detection system for detecting lamplight failure in a lamplight circuit, the lamplight circuit having a plurality of lamplight units connected with the secondary side circuits of each of a plurality of current transformers, the current...	12/01/1992
5099177	Lamp circuit with disconnected lamp detecting device A plurality of current transformers connected in series provide secondary winding sides respectively connected to lamps. A constant-current source is provided to supply constant current to these lamps. Each lamp is connected to the corresponding terminal ...	03/24/1992
5047696	Power-limited ceiling lighting system A power-limited (Class-2/3) fluorescent lighting system suitable for use with suspended ceiling systems consists of the following principal components: a) power-line-operated power supplies, each power supply having a plurality of outputs, with each such ...	09/10/1991
5021717	Operating system for multiple fluorescent lamps A fluorescent lamp operating system comprises: (i) a plurality of pairs of fluorescent lamps for providing luminous radiation, each pair of lamps being adapted to be powered from 30 kHz/120 Volt by way of a high-Q series-resonant L-C ballasting circuit; (ii) a...	06/04/1991
5015923	Extra efficient electronic ballast for fluorescent lamps A power-line-operated ballast for two fluorescent lamps has a self-oscillating half-bridge inverter whose 30 kHz squarewave output voltage is switchably connected either with an auxiliary transformer and/or with a series-resonant L-C circuit. The lamps ar...	05/14/1991
4970438	Electronic fluorescent lamp ballasting system A lighting arrangement comprises; (i) a plurality of pairs of mutually parallel-oriented fluorescent lamps, each pair of lamps adapted to be powered from 30 kHz/240 Volt by way of a high-Q series-resonant L-C ballasting circuit; (ii) a relatively low-power fre...	11/13/1990
4912372	Power circuit for series connected loads A power circuit for N series connected loads according to the present invention includes N transformers having primary windings connected in series across a constant current AC source and secondary windings connected in series with the N loads. N-1 conduc...	03/27/1990
4871946	Electrodeless high intensity discharge lamp An electrodeless high intensity arc discharge lamp employs an excitation coil comprised of a high-temperature metal, such as tungsten or molybdenum, wound directly on the hot quartz envelope of the arc tube within the interior of the outer glass envelope ...	10/03/1989
4754199	Self contained gas discharge display device A gas discharge apparatus includes a discharge chamber including a transparent dome portion and an electrode-including base portion, which together enclose an ionizable gas. A cup-shaped base member is affixed at its periphery to the edge of the base port...	06/28/1988
4754201	Magnetic low load factor series ballast circuit A series ballast circuit for operating a gas discharge tube from a constant current alternating voltage source having a fundamental frequency is disclosed. The primary feature of the ballast circuit comprises a ballast transformer having a magnetic core a...	06/28/1988
4667133	Power-limited lighting system Subject power-limited lighting system consists of the following principal component parts: (a) a number of power-line-operated power supplies, each such power supply having a plurality of individual output receptacles, with each output receptacle being li...	05/19/1987
4441055	Lighting system A lighting system comprises gaseous discharge lamps (8) connected to a source (1) of regulated alternating current through current transformers (5). The primary windings (6) of the current transformers (5) are connected in series to the source (1). The ga...	04/03/1984
4430628	High efficiency inverter and ballast circuits A high efficiency push-pull inverter circuit employing a pair of relatively high power switching transistors is described. The switching on and off of the transistors is precisely controlled to minimize power losses due to common-mode conduction or due to...	02/07/1984
4396868	Lamp circuit with disconnected lamp detecting device A lamp circuit is provided having a constant current-type AC power source and a plurality of isolation transformers coupled in series with the AC power source. The secondary circuit of each isolation transformer is connected to an electric lamp. The outpu...	08/02/1983
4339695	High pressure sodium lamp ballast circuit A ballast circuit for limiting the kilovolt-ampere rating of a ballast required to operate a high pressure sodium lamp during starting, hot restart and lamp out conditions. The ballast circuit includes a voltage limiting or clamping circuit across the sec...	07/13/1982
4295079	Lamp circuit with disconnected lamp detecting device A lamp circuit is provided having a constant current type AC power source and a plurality of isolation transformers connected in series with the AC power source. The secondary circuit of each isolation transformer is connected to an electric lamp. The vol...	10/13/1981
4293799	Power supply systems A power supply system for operating fluorescent lamps in a hazardous atmosphere comprises a 1 kHz to 500 kHz constant current power supply which feeds primary windings of transformers which are connected together in series. Fluorescent lamps are connected...	10/06/1981
4259616	Multiple gaseous lamp electronic ballast circuit An electronic ballast circuit for a multiple gaseous lamp load includes a feedback rectifier circuit coupled to a high frequency inverter circuit and to a DC source. The high frequency inverter circuit is also coupled to the multiple gaseous load and a va...	03/31/1981

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Class 315/256 - Primaries in series