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    • 8. 发明授权
    • Ballast for fluorescent lamp
    • 荧光灯镇流器
    • US06211620B1
    • 2001-04-03
    • US09393896
    • 1999-09-10
    • Masayoshi GyotenMasataka OzawaMasanobu MurakamiKoji Miyazaki
    • Masayoshi GyotenMasataka OzawaMasanobu MurakamiKoji Miyazaki
    • H05B3904
    • H05B41/295
    • A ballast for a fluorescent lamp includes a high frequency power source circuit for supplying a preheat start type fluorescent lamp with preheating and lighting current via an inductor. The high frequency power source circuit includes at least two switching elements for controlling application of voltages of different polarity to the fluorescent lamp, a self-exciting type switching element driving circuit for driving the switching elements so as to alternate on and off repeatedly; and a timer circuit for detecting lapse of a predetermined time from start of the ballast for the fluorescent lamp. The switching element driving circuit shortens an ON-period of at least one of the switching elements to restrict an increase of an amplitude of current flowing in the inductor during a period until the timer circuit detects lapse of a predetermined time.
    • 用于荧光灯的镇流器包括用于通过电感器向预热启动型荧光灯提供预热和点亮电流的高频电源电路。 高频电源电路包括用于控制对荧光灯施加不同极性的电压的至少两个开关元件;用于驱动开关元件以重复交替开关的自激式开关元件驱动电路; 以及用于检测从荧光灯的镇流器开始起经过预定​​时间的定时器电路。 开关元件驱动电路缩短至少一个开关元件的接通周期,以限制在定时器电路检测到经过预定时间的时间段期间在电感器中流动的电流的振幅的增加。