| Patents for H05B 41 - Circuit arrangements or apparatus for igniting or operating discharge lamps (35,100) |
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| 05/03/1994 | US5309065 Voltage doubler ballast system employing resonant combination tuned to between the second and third harmonic of the AC source |
| 05/03/1994 | US5309062 Three-way compact fluorescent lamp system utilizing an electronic ballast having a variable frequency oscillator |
| 04/30/1994 | CA2109252A1 Electronic ballast for a high intensity discharge lamp |
| 04/28/1994 | DE4236145A1 Two-stage ballast circuit for LV discharge lamp - has rectifier with control circuit where shunting main resistor with others gives dimming and electrode pre-heating functions |
| 04/27/1994 | EP0594247A1 Illumination unit, and electrodeless low-pressure discharge lamp and coil suitable for use therein |
| 04/27/1994 | CN2163502Y Energy saving fluorescent lamp ballast |
| 04/27/1994 | CN2163501Y Electronic starter of fluorescent lamp |
| 04/27/1994 | CN2163500Y Casing of electronic ballast |
| 04/27/1994 | CA2107423A1 Excitation coil for an electrodeless fluorescent lamp |
| 04/26/1994 | US5306987 Acoustic resonance arc stabilization arrangement in a discharge lamp |
| 04/26/1994 | US5306986 Zero-voltage complementary switching high efficiency class D amplifier |
| 04/21/1994 | DE4331378A1 Lighting current circuit for motor vehicle discharge lamp - detects lamp voltage or equivalent signal to disconnect power supply when lamp is flickering |
| 04/20/1994 | EP0593312A2 Fluorescent light source |
| 04/20/1994 | EP0593311A1 Fluorescent light source |
| 04/20/1994 | CN2162757Y Energy-saving over-power transducer |
| 04/20/1994 | CN2162756Y Low voltage starter for fluorescent lamp |
| 04/20/1994 | CN2162723Y Electron fluorescent lamp base |
| 04/20/1994 | CN2162710Y Special incandescent lamp for fluorescent lamp ballast |
| 04/19/1994 | US5304897 Device for initiating discharge of cold-cathode discharge tube |
| 04/17/1994 | CA2108435A1 Light source including parallel driven low pressure rf fluorescent lamps |
| 04/14/1994 | WO1994008439A1 Electrodeless lamp with bulb rotation |
| 04/14/1994 | DE4233861A1 Control appts. for high voltage gas discharge lamps - has high frequency circuit with transformer secondary having resonance circuit allowing variable frequency |
| 04/14/1994 | CA2144978A1 Electrodeless lamp with bulb rotation |
| 04/13/1994 | EP0591576A1 An ultrapower-saving inverter circuit which makes its protective function possible and output voltage and luminous intensity adjustable |
| 04/13/1994 | EP0591464A1 Master-slave half-bridge dc-to-ac switchmode power converter |
| 04/13/1994 | CN2162075Y Light regulator for fluorescent lamp |
| 04/13/1994 | CN2162070Y Electronic buffer long-life starting switch for fluorecent lamp |
| 04/13/1994 | CN2162069Y Starting switch for lamplight |
| 04/13/1994 | CN2161810Y AC and DC dual-purpose fluorescent lamp |
| 04/13/1994 | CN1085379A Automatic compensation energy-saving, service life prolonged starter for fluorescent lamp |
| 04/13/1994 | CN1085351A Electric lamp |
| 04/12/1994 | US5303140 Power source circuit |
| 04/12/1994 | US5302883 Automated apparatus and method for the reproduction of same color temperature luminous intensity standard light source |
| 04/09/1994 | CA2107987A1 Reduced tension modular neon sign system |
| 04/06/1994 | EP0590639A1 A fluorescent lamp starter |
| 04/06/1994 | CN2161050Y Wide-voltage ballast for fluorescent lamp |
| 04/06/1994 | CN2161049Y Contactless glow starter for fluorescent lamp |
| 04/06/1994 | CN2161048Y Glow starter for fluorescent lamp |
| 04/06/1994 | CN2161047Y Glow starter for fluorescent lamp |
| 04/05/1994 | US5300863 Auxiliary lighting circuit for a gaseous discharge lamp |
| 04/05/1994 | US5300860 Capacitively coupled RF fluorescent lamp with RF magnetic enhancement |
| 03/31/1994 | WO1994007346A1 Device for igniting gas discharge lamps |
| 03/31/1994 | WO1994007345A1 Clocked current supply circuit |
| 03/31/1994 | DE4232438A1 Ballast circuit for fluorescent lamp - uses two transformers with filament heating windings in phase opposition and time switch for ignition winding |
| 03/31/1994 | DE4231968A1 Getaktete Stromversorgungsschaltung Pulsed power supply circuit |
| 03/30/1994 | EP0589081A1 Circuit for operating a fluorescent lamp with a current measuring circuit |
| 03/30/1994 | CN2160187Y 电子启辉器 Electronic starter |
| 03/30/1994 | CN1084692A Stabilizing and switching method and apparatus for projection xenon lamp |
| 03/29/1994 | US5299100 Microwave powered vehicle lamp |
| 03/29/1994 | US5298876 Bi-metallic switch element |
| 03/29/1994 | US5298837 Ultraviolet flash dryer |
| 03/29/1994 | US5298836 Power supply circuit for gas discharge lamps operating at a resonant frequency |
| 03/24/1994 | DE4332059A1 Gas-discharge lamp light controller - includes two series-circuits each comprising two switching elements connected in parallel with DC voltage source. |
| 03/24/1994 | DE4231732A1 Multi=cell battery charging method - connecting cells to diagnostic device and regulating charge voltage according to highest clamp voltage |
| 03/24/1994 | DE4231286A1 Vorrichtung zum Zünden von Gasentladungslampen A device for ignition of gas discharge lamps |
| 03/23/1994 | EP0587923A1 High-frequency constant-current feeding system |
| 03/23/1994 | EP0587758A1 Low pressure xenon lamp and driver circuitry for use in theatrical productions and the like |
| 03/23/1994 | CN2159642Y Stepless bright regulating ballast for fluorescent light |
| 03/23/1994 | CN1084342A Protection method for electronic ballast |
| 03/22/1994 | US5296783 Dual filament lamp and drive apparatus for dimmable avionics displays |
| 03/22/1994 | CA1327991C High frequency ballast for gaseous discharge lamps |
| 03/17/1994 | WO1994006262A1 Power supply for a gaseous discharge device |
| 03/17/1994 | WO1994006261A1 Freely oscillating inverter with pulse width control |
| 03/17/1994 | WO1994006260A1 Current crossover-controlled blocking oscillator |
| 03/17/1994 | WO1994006259A1 Circuit for operating fluorescent and neon-argon gas tubes without starter, ballast and high-voltage transformers |
| 03/17/1994 | DE4328306A1 Circuit for HF operation for low presence discharge lamps - has rectifier and inverter and several opto-couplers, with controlled load circuit |
| 03/17/1994 | DE4326881A1 High-density gas discharge lamp starting and operating circuit - gives optimum matching of lamp operating voltage during both initial heating and subsequent operating phases |
| 03/16/1994 | EP0587183A2 Apparatus for remote ballasting of gaseous discharge lamps |
| 03/16/1994 | CN1084005A Impedance matching and filter network for use with electrodeless discharge lamp |
| 03/16/1994 | CN1084004A Electronic starter for fluorescent lamp |
| 03/16/1994 | CN1024070C Electronic solid started for fluorescent lamps |
| 03/16/1994 | CA2106155A1 Fluorescent lighting system |
| 03/15/1994 | US5295036 Lighting circuit for vehicular discharge lamp |
| 03/15/1994 | US5294868 Dual lamp electronic ballast with independent control means |
| 03/10/1994 | DE4328748A1 Rectifier - Has resonant circuit with inductor, capacitor and triacs, with load in parallel with capacitor |
| 03/09/1994 | EP0586180A1 Fluorescent lamp |
| 03/09/1994 | EP0585727A1 DC-AC converter with two charging capacitors connected in series |
| 03/09/1994 | CN2158607Y Multi-function arrangement for controlling fluoescent |
| 03/09/1994 | CN1083572A Luminaire of variable color temperature |
| 03/08/1994 | US5293099 Circuit for driving a gas discharge lamp load |
| 03/03/1994 | WO1994004970A1 Apparatus for pulsed electrical power circuitry |
| 03/03/1994 | DE4228683A1 Self-oscillating current inverter for ohmic-inductive load, e.g. discharge lamp - uses two controlled switches across DC supply with overvoltage protection element between inductance and transformer primary in series load circuit |
| 03/03/1994 | DE4228644A1 AC inverter circuit for gas discharge lamp - has pair of transistors forming bridge with capacitors and circuit elements to cause alternate switching of transistors |
| 03/03/1994 | DE4228641A1 Vorschaltgerät für eine Gasentladungslampe mit einem Wechselrichter Ballast for a gas discharge lamp comprising an inverter |
| 03/03/1994 | DE4228640A1 Stromnulldurchgangsgesteuerter Sperrwandler Zero current controlled flyback converter |
| 03/02/1994 | EP0585108A1 Fluorescent lamp |
| 03/02/1994 | EP0585077A1 Power supply circuit with power factor correction |
| 03/02/1994 | EP0584886A1 Variable color luminaire |
| 03/02/1994 | CN1083303A Electronic device for prolonging life and increasing brightness of fluorescent lamp |
| 03/02/1994 | CN1023929C Electronic switching ballast for fluorescent lamp |
| 03/01/1994 | US5291299 Power supply and control unit for a light system and a lighting unit for the light system |
| 03/01/1994 | US5291101 Electronic ballast for a discharge lamp with current sensing |
| 03/01/1994 | US5291100 Ballast control circuits; regulating direct currents; automatic aging compensation; safety shutdown |
| 03/01/1994 | US5291099 Neon sign power supply circuit with automatic power interruption |
| 03/01/1994 | CA2103985A1 Electrodeless fluorescent lamp configuration |
| 03/01/1994 | CA2103984A1 Electrodeless fluorescent lamp shield for reduction of electromagnetic interference and dielectric losses |
| 02/26/1994 | CA2101144A1 Power supply circuit with power factor correction |
| 02/25/1994 | CA2104624A1 Frequency stabilized electronic ballast and fluorescent lamp system |
| 02/25/1994 | CA2104623A1 Ground fault detector and associated logic for an electronic ballast |
| 02/24/1994 | DE4227427A1 Ignition procedure for DC high-pressure gas-discharge lamps - uses inductor and capacitor to store energy from main power supply which is coupled inductively to ballast circuit |