Class 315/216 - Plural electrically operated switches

Subclass of Class 315 - Electric lamp and discharge devices: systems
Definition: Systems in which the distributor type periodic switch means
No. of patents: 27
Last issue date: 02/19/2008

Number	Title	Issue Date
7332875	Illumination apparatus, and an illumination head and power source device used therefore An illumination apparatus used by connecting an illumination head to a power source device, capable of supplying a rated current to individual light emitting devices of the illumination head by using a power source device of an identical rating irrespective of the s...	02/19/2008
7321199	Display apparatus and control method thereof A display apparatus and method in which a current ripple is decreased to improve characteristics of a display apparatus are provided. A display apparatus comprises a light source, a plurality of driving power units providing driving electric powers to the light sour...	01/22/2008
7317287	Circuit for an LED array A circuit arrangement for an LED array having two or more parallel-connected LED chains (LK1, LK2, LK3), in each of which at least one LED (2) is arranged and, when there are two or more LEDs (2), the latter are connected in series...	01/08/2008
7307614	Light emitting diode driver circuit Describe is a device for a multiplexing, output current-sensed, boost converter circuit which may be used as an LED driver. A boost converter LED driver circuit using a single set of passive external LC components for controlling the current through, and thus the ou...	12/11/2007
7271550	Dimmer circuit arrangement A dimmer circuit arrangement is disclosed including a second control circuit (40) for controlling the operation of a triac (50) for delivering current to a load (60), and a first control circuit (10) for controlling the operation of an IG...	09/18/2007
7233258	LED matrix current control A system is employed to provide a substantially constant intensity light source via functional circuitry, the functional circuitry comprises a switching power supply. At least one signal is part of a matrix of LEDs connected in series and parallel and configured for...	06/19/2007
7230474	Current drive circuit reducing VDS dependency A first transistor is provided in a first route and a second transistor is provided in a second route, the first route and the second route constituting a current mirror circuit. The sources of the transistors are grounded. In order to match VDS of the fi...	06/12/2007
7122971	Driver circuit for driving a plurality of DC lamp strings A driver circuit for a DC light source supplies a voltage generated by a DC-to-DC converter for a plurality of lamp strings connected in parallel and a plurality of driving currents generated by a current mirror for the lamp strings, such that the lamp strings may h...	10/17/2006
7116086	System and method for driving LEDs Embodiments of the invention provide for a system and method for driving LEDs with consistently good illumination and superior efficiency at lower cost and suitable for use with cheaper LEDs or with LEDs having wide component parameter tolerances over wide operating...	10/03/2006
7116052	Vehicular lamp Electric current supplied to light source rows of a vehicular lamp is controlled appropriately. The vehicular lamp includes: a plurality of semiconductor light emitting devices connected in parallel; a wire breakage detecting unit detecting wire breakage of each of ...	10/03/2006
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
7075250	Three-component protective head gear powered by a rechargeable battery A three-component, protective headgear or helmet is provided with a battery-powered LED head lamp, which may be used by construction workers, search and rescue persons, cyclists, police, fireman, and the like. The battery may be replaceable or rechargeable and has l...	07/11/2006
6949892	Light emitting element drive device and electronic device light emitting element An electronic apparatus includes a display device (20) and a drive device (10) for driving the display (20). The display device (20) is equipped with light emitting elements (21-26) such as LEDs driven at high voltages. The display...	09/27/2005
6864641	Method and apparatus for controlling light emitting diodes A light emitting code (“LED”) circuit includes a plurality of light emitting diodes connected in a hybrid parallel-series configuration, and a current regulating circuit that includes a current regulating element connected to a first chain of the plurality of ch...	03/08/2005
6853150	Light emitting diode driver A LED driver includes a high frequency inverter and an impedance circuit. The high frequency inverter operates to produce a high frequency voltage source whereby the impedance circuit directs a flow of alternating current through a LED array including one or more an...	02/08/2005
6798152	Closed loop current control circuit and method thereof A circuit and method for providing closed loop control using constant current switching techniques is disclosed herein. By controlling the current supplied to high intensity light emitting diodes (LEDs) using the techniques and circuits described, high intensity LED...	09/28/2004
6621235	Integrated LED driving device with current sharing for multiple LED strings An integrated LED driving device for multiple LED strings which employs a single linear regulator or other controller and a multiple-output current mirror which is almost independent of the DC input voltage source, almost independent of the transistor's o...	09/16/2003
6577072	Power supply and LED lamp device An LED lamp device of the invention includes a power supply unit (102, 103) supplied with an alternating-current power supply voltage, and an LED lamp (106) constituted by one or a plurality of serially connected LEDs connected to output terminals of the ...	06/10/2003
6478441	Hand held light apparatus A hand held light apparatus is disclosed. The apparatus has a handle portion, a central portion, and a cap portion for mounting a lamp. An electric circuit, preferably located in the central portion, connects the lamp with a power source, preferably batte...	11/12/2002
5410220	Control circuit for drive circuit of an electronic ballast for a discharge lamp The invention relates to an electronic ballast for a discharge lamp, comprising a drive circuit supplying high-frequency current to the lamp and including two power switches (V1, V2) and control circuits therefor for controlling the power switches, such t...	04/25/1995
5338110	Circuit, having multiple series resonant paths, for lighting a blinking fluorescent lamp without adversely affecting lamp life A circuit for lighting a fluorescent lamp. The present invention takes into account the fastidious characteristics of the fluorescent lamp, and during the momentary lighting of the fluorescent lamp. In order to reduce the temperature fluctuations, a separ...	08/16/1994
5247228	Fluorescent lamp ballast adaptor An adaptor circuit used to enable stable, flicker-free operation of T8-type fluorescent lamps in a lighting fixture which already has a standard two-lamp, series-sequence, 40 watt, rapid-start type ballast installed therein. The adaptor circuit contains a...	09/21/1993
5036305	Segmented interlayer spacer bars for multilayer superconducting solenids A spacer bar, or system of spacer bars, interposed between coil layers of a coil structure. The spacer bar comprises a block of electrical insulating material adapted to be arranged between adjacent layers of a coil. The spacer bar may comprise several sp...	07/30/1991
4571527	VFET Driving circuits for plasma panel display systems A driving system for a plasma panel display which uses VFETs for output switches controls the transition time of an output waveform to a constant time. Transformerless circuitry for communicating low voltage digital logic signals across a floating boundar...	02/18/1986
4415839	Electronic ballast for gaseous discharge lamps An electronic ballast for energizing one or more gaseous-discharge lamps and for regulating the power consumed thereby, the ballast including a power supply for providing a source of DC power between a pair of outputs, a pair of transistors connected as s...	11/15/1983
4001810	Sequence reversing border light display A series of flashing lights arranged in a line or circle appear as a group to move or rotate by properly timing the OFF or periods of the lights. The lights are divided into three interpositioned groups for separate control. The groups progressively go da...	01/04/1977

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Class 315/216 - Plural electrically operated switches