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    • 4. 发明公开
    • Discharge lamp lighting circuit
    • Entladungslampenbeleuchtungsschaltung
    • EP2197249A1
    • 2010-06-16
    • EP09174402.9
    • 2009-10-29
    • Koito Manufacturing Co., Ltd.
    • Ichikawa, TomoyukiSaito, KazukiIto, Masayasu
    • H05B41/04H05B41/292
    • H05B41/2921H05B41/04H05B41/2923H05B41/2925
    • A discharge lamp lighting circuit facilitates carrying out re-ignition and addresses a problem than can arise due to an influence of a capacitor in an auxiliary lighting circuit. A driving voltage generating portion supplies an AC driving voltage to a discharge lamp to be a driving target. An auxiliary lighting circuit is provided on a terminal side of the discharge lamp. An auxiliary lighting capacitor, an auxiliary lighting resistor and a switch are provided in series between the terminal of the discharge lamp and a fixed voltage terminal. A control circuit controls a conducting state of the switch. The switch is brought into an ON state before the discharge lamp is turned ON, and is brought into an OFF state after the discharge lamp is turned ON.
    • 放电灯点亮电路有助于进行再点火,并且解决了由于辅助照明电路中的电容器的影响而引起的问题。 驱动电压产生部分将AC驱动电压提供给作为驱动目标的放电灯。 辅助照明电路设置在放电灯的端子侧。 在放电灯的端子和固定电压端子之间串联提供辅助照明电容器,辅助照明电阻器和开关。 控制电路控制开关的导通状态。 在放电灯接通之前,开关处于导通状态,在放电灯导通后进入关断状态。
    • 7. 发明公开
    • Discharge lamp lighting circuit
    • Beleuchtungsgerätmit Entladungsschaltung
    • EP2086291A2
    • 2009-08-05
    • EP09001543.9
    • 2009-02-04
    • Koito Manufacturing Co., Ltd.
    • Suzuki, TomokazuIchikawa, Tomoyuki
    • H05B41/288
    • H05B41/2887
    • A discharge lamp lighting circuit is capable of preventing the discharge lamp from going out unexpectedly. The discharge lamp lighting circuit includes a DC-AC inverter which receives a power source voltage, boosts and converts the power source voltage into AC and supplies AC electric power to the discharge lamp 21. A control circuit sends a long cycle signal when the discharge lamp 21 is started. The cycle of the long cycle signal is longer than a frequency at the time of steady lighting. The control circuit sends a steady drive signal, which is a frequency at the time of steady lighting, to the DC-AC inverter 25. A cycle of the long cycle signal is set according to at least one of the power source voltage, the temperature of the discharge lamp lighting circuit or the extinguishing time.
    • 放电灯点亮电路能够防止放电灯意外地熄灭。 放电灯点亮电路包括接收电源电压的DC-AC逆变器,将电源电压升压并转换为AC,并将AC电力提供给放电灯21.控制电路在放电灯 21开始了。 长周期信号的周期长于稳定点亮时的频率。 控制电路将稳定点亮时的稳定驱动信号发送到DC-AC逆变器25.长周期信号的周期根据电源电压,温度 的放电灯点亮电路或熄灭时间。