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    • 5. 发明申请
    • METHOD FOR DETECTING THE CUTTING OFF SIGNAL OF BJT IN AN ELECTRONIC BALLAST AND THE ELECTRONIC BALLAST
    • 用于检测电子镇流器和电子镇流器中BJT的切断信号的方法
    • WO2007147725A1
    • 2007-12-27
    • PCT/EP2007/055485
    • 2007-06-04
    • PATENT-TREUHAND-GESELLSCHAFT FÜR ELEKTRISCHE GLÜHLAMPEN MBHGAO, WeiHECKMANN, MarkusLI, JiXUE, Yanshun
    • GAO, WeiHECKMANN, MarkusLI, JiXUE, Yanshun
    • H05B41/282H05B41/285H02M3/335
    • H05B41/2856H02M1/38H05B41/2828Y02B20/186
    • This invention relates to a method for detecting the real cutting off signal of BJT (bipolar junction transistor) in an electronic ballast and the corresponding electronic ballast. Said electronic ballast comprises a half-bridge circuit composed of two BJTs, the voltage output signal of said half- bridge circuit is on the one hand provided to a lamp and on the other hand is grounded via a capacitor and a backward diode. In order to accurately and quickly detect the real cutting off signal of said BJT, the HB control unit measures the sharp slope of voltage at the connection point (N) between the capacitor and the diode. By measuring the time between the flank of the control pulse for cutting off BJT and the corresponding sharp slope of voltage appearing accordingly at the connection point, the storage times (Ts1, Ts2) of the two BJTs are obtained. Said storage times are compared with each other, wherein the shorter storage time is used to adjust the amplitude of IC output for base current regulation, and the longer storage time is used to adjust the deadtime of IC outputs to make sure that there is always enough and appropriate deadtime. Thereby an electronic ballast operating more safely is provided.
    • 本发明涉及一种用于检测电子镇流器中的BJT(双极结型晶体管)和相应的电子镇流器的实际截止信号的方法。 所述电子镇流器包括由两个BJT组成的半桥电路,所述半桥电路的电压输出信号一方面提供给灯,另一方面通过电容器和反向二极管接地。 为了准确,快速地检测到所述BJT的实际切断信号,HB控制单元测量电容器和二极管之间的连接点(N)处的电压的急剧斜率。 通过测量用于切断BJT的控制脉冲的侧面与相应地在连接点出现的相应的急剧斜率之间的时间,获得两个BJT的存储时间(Ts1,Ts2)。 所述存储时间相互比较,其中使用较短的存储时间来调节用于基极电流调节的IC输出的幅度,并且使用较长的存储时间来调整IC输出的死区时间,以确保总是足够 和适当的死时间。 从而提供更安全地操作的电子镇流器。