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    • 1. 发明授权
    • Discharge lamp lighting device, illumination device, and projector
    • 放电灯照明装置,照明装置和投影仪
    • US07511432B2
    • 2009-03-31
    • US10542415
    • 2004-01-16
    • Koji WatanabeKiyoaki UchihashiHisaji ItoToshiaki SasakiJunichi HasegawaKatsuyoshi Nakada
    • Koji WatanabeKiyoaki UchihashiHisaji ItoToshiaki SasakiJunichi HasegawaKatsuyoshi Nakada
    • H05B37/02H05B39/04
    • H05B41/2928H05B41/386
    • In a chopper circuit, output power is controllable with a direct current power source as a power source, and a smoothing capacitor is connected between output terminals of the chopper circuit. A polarity inversion circuit applies an alternating voltage to a high pressure discharge lamp with a voltage across the smoothing capacitor as a power source. The output power of the chopper circuit and an inversion frequency of the polarity inversion circuit are controlled by a control circuit based upon a terminal voltage of the smoothing capacitor, which is detected by a voltage detecting circuit. In the control circuit, a switch voltage is set for defining a range of voltages detected by the voltage detecting circuit, and the inversion frequency is changed in plural stages according to the magnitude relation between the detected voltage and the switch voltage. The inversion frequency corresponding to electric power applied to the high pressure discharge lamp is set with respect to each range of lamp voltages, to thereby inhibit occurrence of an arc jump.
    • 在斩波电路中,输出功率由直流电源作为电源控制,平滑电容器连接在斩波电路的输出端子之间。 极性反转电路将交流电压施加到具有作为电源的平滑电容器两端的电压的高压放电灯。 斩波电路的输出功率和极性反转电路的反转频率由基于由电压检测电路检测的平滑电容器的端子电压的控制电路来控制。 在控制电路中,设定用于定义电压检测电路检测出的电压范围的开关电压,根据检测电压与开关电压之间的大小关系,反转频率变化多级。 相对于每个灯电压范围设定对应于施加到高压放电灯的电力的反转频率,从而抑制电弧跳跃的发生。