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| Number | Title | Issue Date |
| 7327101 | Single point sensing for end of lamp life, anti-arcing, and no-load protection for electronic ballast Systems and methods are disclosed that facilitate sensing a pulse in a ballast circuit for a lamp when the lamp is in an end-of-life (EOL) stage or when the lamp is experiencing an arcing conduction condition, such as may occur when a contact between the lamp and it... | 02/05/2008 |
| 7282863 | Auxiliary quartz lamp lighting system for electronic high intensity discharge lamp ballasts A method and electronic circuit operate a quartz auxiliary lamp lighting lamp and circuit to light a quartz auxiliary lamp at 120 Vac and 50-60 Hz current connected to an electronic HID ballast operating at a frequency of 100 Hz to over 400 kHz and voltages of from ... | 10/16/2007 |
| 7183726 | Cold cathode fluorescent lamp drive apparatus and method A cold cathode fluorescent lamp drive apparatus for lighting a cold cathode fluorescent lamp is disclosed. The cold cathode fluorescent lamp drive apparatus includes an abnormal current holding unit that is configured to hold an abnormal current that flows in the co... | 02/27/2007 |
| 6873111 | Vehicular lamp A vehicular lamp used in a vehicle, includes: a light source for emitting light in accordance with a voltage given thereto; a light-source controlling transistor for controlling power supplied to the light source by repeatedly switching whether or not the power is s... | 03/29/2005 |
| 6703795 | Auxiliary controller A lighting system includes a primary lamp circuit, an auxiliary lamp circuit, and an auxiliary controller. The auxiliary controller is connected between the primary lamp circuit and the auxiliary lamp circuit and is operable to sense a primary lamp circui... | 03/09/2004 |
| 5920153 | Power supply for light sources, particularly for the quick ignition of fluorescent lamps and the like A power supply for light sources, particularly for fluorescent lamps and the like, comprising capacitive means (1) that are connected to the mains (9) and are adapted to supply rectifier means (2) for rectifying the mains current from AC to DC; and filter... | 07/06/1999 |
| 5844379 | Circuit arrangement for igniting a high pressure discharge lamp The invention relates to a circuit arrangement for operating a high-pressure discharge lamp. A buffer capacitor is shunted by a branch which comprises a series circuit of a second capactor and a unidirectional element for blocking a current with which the... | 12/01/1998 |
| 5298837 | Ultraviolet flash dryer A quick start ultraviolet emission unit with an elongated, electrode-type, mercury-filled, arc lamp having spaced end electrodes connected to an electrical power supply that connects to an alternating current power source and to each end electrode of the ... | 03/29/1994 |
| 4739225 | Reduced requirement energy storage for load having non-zero minimum operating potential A load is provided, at all times when in operation, with a D.C. voltage having at least a minimum holding magnitude by: providing a source voltage having a peak magnitude greater than the holding magnitude; connecting the source voltage to the load only w... | 04/19/1988 |
| 4494045 | Ballast circuit for a 220-volt improved lighting unit A ballast circuit for developing a predetermined desired D.C. voltage to enhance the operation of a gas discharge tube in a lighting unit of the type which also comprises an incandescent filament is disclosed. The ballast circuit operates from an applied ... | 01/15/1985 |
| 4087723 | Arrangement for starting and operating a discharge lamp The invention relates to an arrangement for starting and supplying a discharge lamp provided with cold electrodes. The lamp is shunted by a starter circuit which consists of a series arrangement of at least a capacitor and a controlled semiconductor switc... | 05/02/1978 |
| 3944876 | Rapid starting of gas discharge lamps A starting device for a gas discharge lamp, to whose electrodes AC voltage is applied, comprises: A. first means electrically connected with at least one lamp electrode to apply to the lamp a transient voltage pulse which initially changes in amplitude in... | 03/16/1976 |
| 3931544 | Fast warm up electronic ballast circuit for a high pressure discharge lamp An electronic ballast circuit for reducing the warm up time of high intensity discharge (HID) lamps wherein lamp current flow is abruptly reduced by a switching means responsive to load voltage variations upon attainment of power in an amount sufficient t... | 01/06/1976 |
