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    • 5. 发明申请
    • METHOD AND DRIVING UNIT FOR DRIVING A GAS-DISCHARGE LAMP
    • 用于驱动气体放电灯的方法和驱动单元
    • WO2009007914A1
    • 2009-01-15
    • PCT/IB2008/052744
    • 2008-07-08
    • PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBHKONINKLIJKE PHILIPS ELECTRONICS N. V.POLLMANN-RETSCH, JensVAN DEN BERGH, John, J. P. J.MACKENS, UwePEKARSKI, PavelCARPAIJ, MarkDEPPE, Carsten
    • POLLMANN-RETSCH, JensVAN DEN BERGH, John, J. P. J.MACKENS, UwePEKARSKI, PavelCARPAIJ, MarkDEPPE, Carsten
    • H05B41/292
    • H05B41/2928Y02B20/208
    • In this method an arc-length control value, indicating the current length of a discharge arc of the gas-discharge lamp (1), is monitored and the lamp (1) is driven in a first operation mode (OMP) with a first current wave-shape when the arc-length control value indicates that the arc-length is higher than a switching threshold, which first current wave-shape is selected to result in a tip (31) growing on an electrode (30) of the lamp (1), and the lamp (1) is driven in a second operation mode (OMn) with a second current wave-shape when the arc-length control value indicates that the arc-length is lower than a switching threshold, which second current wave-shape is selected such that the tip (31) on the electrode (30) is at least partly melted back. In this method an operating frequency of the lamp is switched from a first frequency value (fi) to a second frequency value (f2), which second frequency • (f 2) value is higher than the first frequency value (fi)', if a first time criterion pertaining to a duration of driving of the lamp (1) in the second operation mode (OMn) is fulfilled and the operating frequency is switched from the second frequency value (f2) to the first frequency value (fi), if a second time criterion pertaining to a duration of driving of the lamp (1) in the first operation mode (OMP) is fulfilled.
    • 在该方法中,监视指示气体放电灯(1)的放电弧的当前长度的电弧长度控制值,并且以第一电流(OMP)驱动灯(1) 当电弧长度控制值指示电弧长度高于切换阈值时,选择第一电流波形以导致尖端(31)在灯的电极(30)上生长(波形) 1),并且当电弧长度控制值表示电弧长度低于开关阈值时,灯(1)以第二电流波形在第二操作模式(OMn)中被驱动,该第二电流波 形状,使得电极(30)上的尖端(31)至少部分地被熔化。 在这种方法中,如果将第二频率(f 2)值高于第一频率值(fi)',则灯的工作频率从第一频率值(fi)切换到第二频率值(f2),如果 满足关于在第二操作模式(OMn)中的灯(1)的驱动持续时间的第一时间标准,并且将操作频率从第二频率值(f2)切换到第一频率值(fi),如果 满足与第一操作模式(OMP)中的灯(1)的驱动持续时间有关的第二时间标准。
    • 7. 发明申请
    • METHOD FOR OPERATING A HIGH-INTENSITY DISCHARGE LAMP, LAMP DRIVER AND PROJECTION SYSTEM
    • 高强度放电灯,灯驱动器和投影系统的操作方法
    • WO2007031900A1
    • 2007-03-22
    • PCT/IB2006/053056
    • 2006-09-01
    • PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBHKONINKLIJKE PHILIPS ELECTRONICS N. V.DEPPE, Carsten
    • DEPPE, Carsten
    • H05B41/392
    • H05B41/3928Y02B20/202
    • There is described a method for operating a high-intensity discharge lamp (2), in which the high-intensity discharge lamp (2) is acted upon by an AC current (I) which commutates between positive pulses (Ip) and negative pulses (In) with a predefined current amplitude (IA), wherein a pulse width ratio between the pulse width of a positive pulse (Ip) and the pulse width of an adjacent negative pulse (In) is modulated in such a way that the mean current value (I) of two successive positive and negative pulses (Ip, In) fluctuates periodically between positive and negative values. In addition, the value of the current amplitude (IA) is modulated in accordance with a predefined modulation function (M). A description is also given of a corresponding lamp driver (10) for a high-intensity discharge lamp (2) and of a projection system (1) comprising such a lamp driver (10).
    • 描述了一种用于操作高强度放电灯(2)的方法,其中高强度放电灯(2)由在正脉冲(Ip)和负脉冲(Ip)之间换向的交流电流(I) In)具有预定电流幅度(IA),其中正脉冲的脉冲宽度(Ip)与相邻负脉冲(In)的脉冲宽度之间的脉冲宽度比被调制成使得平均电流值 两个连续的正和负脉冲(Ip,In)的(I)周期性地在正值和负值之间波动。 此外,根据预定义的调制函数(M)调制当前幅度(IA)的值。 还给出了用于高强度放电灯(2)的相应的灯驱动器(10)和包括这种灯驱动器(10)的投影系统(1)的描述。