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    • 1. 发明授权
    • Impedance matching circuit for an electrodeless fluorescent lamp ballast
    • 用于无电极荧光灯镇流器的阻抗匹配电路
    • US5446350A
    • 1995-08-29
    • US228826
    • 1994-04-18
    • Sayed-Amr El-HamamsyGerald W. LudwigDavid O. WharmbyLouis R. Nerone
    • Sayed-Amr El-HamamsyGerald W. LudwigDavid O. WharmbyLouis R. Nerone
    • H05B41/24H05B41/28H05B37/00
    • H05B41/2806Y02B20/22
    • An impedance matching circuit for a self-oscillating electrodeless fluorescent lamp ballast of the type having an inductor connected in series with the parallel combination of a capacitor and the lamp's drive coil includes an additional capacitor connected in series with the drive coil. The capacitance value chosen for the additional capacitor is dependent on: stresses on the parallel capacitor; matching the impedance of the ballast; and the impact of the capacitor on the loaded coil phase angle. The additional capacitor reduces the phase angle presented to the ballast, thereby lowering the sensitivity of the ballast to component and lamp variations. In addition, the overall impedance of the network is reduced, such that the required inductance of the series inductor is reduced; hence, the inductor can have fewer turns and lower conduction losses. The current in inductor for the required power level is lower, resulting in a further reduction in conduction losses as well as a reduction in core losses due to lower flux in the core. Still further, a reduction of stresses on the inductor results in a reduced operating temperature, and hence increased efficiency, reliability and ballast life.
    • 具有与电容器和灯的驱动线圈的并联组合串联的电感器的自振荡无电极荧光灯镇流器的阻抗匹配电路包括与驱动线圈串联连接的附加电容器。 为附加电容选择的电容值取决于:并联电容器上的应力; 匹配镇流器的阻抗; 以及电容对负载线圈相位角的影响。 额外的电容器可以降低镇流器的相位角,从而降低镇流器对零件和灯泡变化的灵敏度。 此外,网络的整体阻抗减小,使得串联电感器所需的电感减小; 因此,电感器可以具有较少的匝数和较低的传导损耗。 对于所需功率电平,电感中的电流较低,导致传导损耗进一步降低,以及由于芯中的较低通量引起的磁芯损耗的减小。 此外,电感器上的应力减小导致工作温度降低,因此提高了效率,可靠性和镇流器寿命。
    • 4. 发明授权
    • Induction lamp with oppositely oriented coil winding layers
    • 感应灯具有相反方向的线圈绕组层
    • US5866991A
    • 1999-02-02
    • US672220
    • 1996-07-17
    • Thomas FarkasTimothy A. TaubertGeorge A. FarrallGordon A. GrigorDavid O. Wharmby
    • Thomas FarkasTimothy A. TaubertGeorge A. FarrallGordon A. GrigorDavid O. Wharmby
    • H01J65/04H05B41/24
    • H01J65/048H05B41/24
    • An electrodeless gas discharge lamp includes a vitreous envelope containing a discharge medium. An excitation coil is positioned in relation to the vitreous envelope so as to excite the discharge medium therein. The excitation coil is adapted to be driven by an RF oscillator. The excitation coil has first and second ends and is effective for exciting the discharge medium to emit light with electromagnetic fields that are generated by the excitation coil. The excitation coil includes a first wire wound generally helically from the first end to the second end in a first helical direction to form first winding turns, and further includes a second wire wound generally helically from the first end to the second end in second helical direction opposite to that of the first helical direction to form second winding turns. Preferably, a generally cylindrical former is provided for holding the first and second wires between the first and second ends of the coil. Such former includes a positioning arrangement for maintaining specific positions of the first and second wires with respect to each other along the former.
    • 无电极气体放电灯包括容纳放电介质的玻璃体外壳。 励磁线圈相对于玻璃体封套定位,以便在其中激发放电介质。 励磁线圈适于由RF振荡器驱动。 励磁线圈具有第一和第二端,并且对于激励放电介质以由激励线圈产生的电磁场发射光是有效的。 励磁线圈包括在第一螺旋方向上从第一端至第二端大致螺旋地缠绕的第一线,以形成第一绕组匝,并且还包括在第二螺旋方向上从第一端至第二端大致螺旋形地缠绕的第二线 与第一螺旋方向的相反,以形成第二绕组匝。 优选地,提供了一种大致圆柱形的成型器,用于将第一和第二线保持在线圈的第一和第二端之间。 这种前置件包括用于沿着前者相对于彼此维持第一和第二线的特定位置的定位装置。