摘要:
An electrodeless lamp comprises an envelope (12) containing a plasma forming fill which includes at least one of sulfur and selenium when excited which emits principally visible light, which is in the form of molecular radiation. The envelope (12) has a diameter of less than one half inch. Means (1) are provided for generating electromagnetic energy. Further means (2, 3, 4, 5, 6) are provided for coupling said electromagnetic energy to said envelope to excite said fill, which in the absence of envelope rotation or with rotation at an insufficient speed, forms a discharge (14) which does not substantially fill the interior volume of said envelope (12). By additional means (13) the envelope (12) is rotated at a fast enough rate so as to cause the discharge (15) formed by the fill to substantially fill the interior volume of the envelope (12).
摘要:
An electrodeless lamp waveguide structure (20) includes tuned absorbers (102, 200) for spurious RF signals. A lamp waveguide (24) with an integral frequency selective attenuation includes resonant absorber (102, 200) positioned within the waveguide (24) to absorb spurious out-of-band RF energy. The absorbers (102, 200) have a negligible effect on energy at the selected frequency used to excite plasma in the lamp. In a first embodiment, one or more thin slabs (80, 82) of lossy magnetic material are affixed to the sidewalls (86, 88) of the waveguide (24) at approximately one quarter wavelength of the spurious signal from an end wall of the waveguide. The positioning of the lossy material optimizes absorption of power from the spurious signal. In a second embodiment, one or more thin slabs (80, 82) of lossy magnetic material are used in conjunction with band rejection waveguide filter elements (100, 108). In a third embodiment, one or more microstrip filter elements (200, 202) are tuned to the frequency of the spurious signal and positioned within the waveguide (24) to couple and absorb the spurious signal's energy. All three embodiments absorb negligible energy at the selected frequency and so do not significantly diminish the energy efficiency of the lamp.
摘要:
A ballast circuit for driving a gas discharge having a source of pulsating and rectified AC (20), an energy storage circuit (30), a switch (40) that can have one end connected to an energy storage inductor and an opposite end that can be connected to circuit common; a control circuit (50) for opening and closing the switch (40) at a rate that is a function of at least a DC control current, a resonant circuit (60) that is coupled to the energy storage circuit (30) for energizing the gas discharge lamp.
摘要:
An electrodeless lamp comprises an envelope (12) containing a plasma forming fill which includes at least one of sulfur and selenium when excited which emits principally visible light, which is in the form of molecular radiation. The envelope (12) has a diameter of less than one half inch. Means (1) are provided for generating electromagnetic energy. Further means (2, 3, 4, 5, 6) are provided for coupling said electromagnetic energy to said envelope to excite said fill, which in the absence of envelope rotation or with rotation at an insufficient speed, forms a discharge (14) which does not substantially fill the interior volume of said envelope (12). By additional means (13) the envelope (12) is rotated at a fast enough rate so as to cause the discharge (15) formed by the fill to substantially fill the interior volume of the envelope (12).
摘要:
Bei einer Schaltungsanordnung zum Starten und Betreiben von Hochdruck-Gasentladungslampen, mit mindestens einem DC/DC-Wandler (D), der strom- oder leistungsgesteuert ist und aus einer Gleichspannungsquelle (B) gespeist wird, der eine Lampenversorgungsspannung erzeugt und der einen Ladekondensator (CL1) an seinem Ausgang aufweist, mit einem zusätzlichen Ladekondensator (CL2) parallel zu dem Ladekondensator (CL1) und mit einem Zündgerät (Z) zur Erzeugung einer Zündspannung in der Verbindung zwischen dem mindestens einen DC/DC-Wandler (D) und der Hochdruck-Gasentladungslampe (GDL) ist, um mit großer Zuverlässigkeit bei dem stationären Betrieb der Hochdruck-Gasentladungslampe (GDL) eine negative Beeinflussung durch den zusätzlichen Ladekondensator (CL2) zu vermeiden, in Reihe zu dem zusätzlichen Ladekondensator (CL2) eine Z-Diode (D1) angeordnet und liegt diese Reihenanordnung parallel zu dem Ladekondensator (CL1).