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| Number | Title | Issue Date |
| 7859192 | Method for operating high-pressure lamps without hotstarting and luminaire having two high-pressure discharge lamps High-pressure discharge lamps can only be restarted in the hot state at a very high starting voltage. In order to avoid hotstarting, a method for operating high-pressure discharge lamps without hotstarting comprises two high-pressure discharge lamps (12a | 12/28/2010 |
| 7307385 | Boost controller capable of step-up ratio control A charge pump circuit boosts a voltage of a battery so as to generate a drive voltage for an LED. A constant current circuit generates a constant current to feed through the LED. A monitoring circuit monitors a cathode potential of the LED, i.e., a voltage across th... | 12/11/2007 |
| 7261458 | Semiconductor chip with container and contact elements for use in a light socket A shunt device for use in a light socket includes a first semiconductor chip and a first container having a receiving surface for receiving the first semiconductor chip therein and having an open surface through which the first semiconductor chip is exposed and a fi... | 08/28/2007 |
| 7247998 | Transient detection of end of lamp life condition apparatus and method A sensor system adapted to detect unwanted transients in the primary side of a luminous lamp load driving circuit and effect a change in operation of the driving circuit. A detection circuit is adapted to detect a transient, determine if it is an appropriate end-of-... | 07/24/2007 |
| 7242148 | Continuous current control circuit modules of series string bulbs type (II) The invention relates to a continuous current control circuit module of series string bulbs type (II), which can maintain the normal current and voltage across each of the bulbs when any of series connected bulbs burn out. The string includes a shunt in every bulb a... | 07/10/2007 |
| 6882111 | Strip lighting system incorporating light emitting devices The invention provides an elongated lighting apparatus that can withstand temperature fluctuations. The elongated lighting apparatus comprises of the following elements: at least two elongated tubular members fabricated from translucent material. These elongated tub... | 04/19/2005 |
| 6870328 | LED lamp apparatus for vehicles In an LED unit, all of eight LEDs are connected in series. The voltage of a power supply, that is, a battery of a vehicle, 12 V, is insufficient for the eight LEDs. To cope with this, a boosting circuit is provided within the control unit to boost the voltage to abo... | 03/22/2005 |
| 6828732 | Fluorescent lamp end-of-life protection circuit A fluorescent lamp end-of-life protection circuit in an illuminating electric appliance, includes a rectifying effect protection circuit for a lamp tube and an overvoltage protection circuit for the lamp tube, in which a circuitry of two series resistors and a capac... | 12/07/2004 |
| 6538448 | Determining remaining operating life of fluorescent lamp A method for determining the remaining operating life of a fluorescent lamp comprising cathodes, when the fluorescent lamp is a part of a fluorescent lamp circuit, which in addition to the fluorescent lamp includes a ballast, for example a capacitor and a... | 03/25/2003 |
| 6400095 | Process and device for the detection of the rectifier effect appearing in a gas discharge lamp Process for the recognition of the rectifier effect appearing in a gas discharge lamp (G1, G2) and an electronic ballast, for the operation of gas discharge lamps (G1, G2), with which such a process finds employment. The electronic ballast includes a moni... | 06/04/2002 |
| 5936359 | Apparatus for efficient remote ballasting of gaseous discharge lamps Remote ballasting apparatus adapted for insertion between a high frequency power source and one or more gaseous discharge lamps. The ballasting apparatus includes an isolation transformer having a primary winding adapted for connection to the high frequen... | 08/10/1999 |
| 5886423 | Electric series circuit An electric series circuit with plural loads such as light bulbs connected in series and plural solid state switching devices, with each switching device connected in parallel with one of the loads. Each switching device conducts current when the load tha... | 03/23/1999 |
| 5777439 | Detection and protection circuit for fluorescent lamps operating at failure mode A circuit for protecting fluorescent lamps connected to a high frequency electronic ballast has a detecting bridge connected to the fluorescent lamps, an output of the detecting bridge varying linearly with a difference between a highest and a lowest volt... | 07/07/1998 |
| 5606224 | Protection circuit for fluorescent lamps operating at failure mode A circuit for protecting fluorescent lamps connected to high frequency electronic ballasts has a detecting bridge connected to the fluorescent lamps, an output of the detecting bridge varying linearly with the highest voltage across the fluorescent lamps,... | 02/25/1997 |
| 5574335 | Ballast containing protection circuit for detecting rectification of arc discharge lamp A ballast includes an inverter for providing an AC voltage to a discharge lamp. As the lamp approaches end-of-life, a DC voltage component develops across the lamp. The ballast includes circuitry for monitoring the condition of each of the cathodes by mea... | 11/12/1996 |
| 5504396 | Discharge lamp control system A new method of control of high voltage gaseous conductor lamps is herein provided allowing the selective control of the operation of such lamps in a single, or multiple lamp series-connected, current regulated supply circuit, through selective shorting o... | 04/02/1996 |
| 5397963 | Subsystem and method for detecting lamp failure A dual mode high intensity aircraft approach lighting system includes a plurality of lights interconnected by means of power wiring. An improved subsystem for detecting lamp failures is disclosed which permits a positive identification of individual faile... | 03/14/1995 |
| 5089753 | Arrangement for predicting failure in fluorescent lamp systems An electronic ballast which will repeatedly try to ignite gas discharge lamps should they fail to ignite under conditions in which they should have ignited together with means rendering said electronic ballast incapable of trying to ignite said lamps afte... | 02/18/1992 |
| 5081399 | Power supply systems for neon lights A main power supply device uses single phase, or three phase R, S, T; through rectification and filtration; each phase produces a different D.C. voltage so as to supply a respective voltage transforming device. The rectifier output of a step-down supply o... | 01/14/1992 |
| 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 |
| 4912371 | Power saving fluorescent lamp substitute An improved non-lighting fluorescent lamp substitute to replace one lamp in a two-lamp series connected circuit so that the circuit is completed through the remaining lamp allowing it to light, whereas without the lamp substitute, the circuit is incomplet... | 03/27/1990 |
| 4570109 | Irradiation device An irradiation device including a series arrangement of an ultraviolet radiation source (5), a first switch (3) and a second switch (4). Under normal conditions the radiation source (5) is switched on and off by the first switch (3). The second switch (4)... | 02/11/1986 |
| 4398126 | Protected low-pressure discharge lamp operating circuit A fluorescent lamp control circuit which provides power at high frequency, or example in the order of 35 kHz, includes a push-pull oscillator circuit having two transistors (T1, T2), an inductance element (L1, L1'), and a capacitor (C1, C1') to supply the ... | 08/09/1983 |
| 4210846 | Inverter circuit for energizing and dimming gas discharge lamps An illumination control system for gas discharge lamps which can be dimmed is provided in which a central inverter produces a sinusoidal output voltage at about 23 kHz. The amplitude of the inverter output is adjustable to dim the lamps. A transmission li... | 07/01/1980 |
