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    • 1. 发明授权
    • Device for automatically compensating failure of a lamp
    • 用于自动补偿灯泡故障的装置
    • US3883777A
    • 1975-05-13
    • US38453373
    • 1973-08-01
    • TOKAI RIKA CO LTD
    • MORITA MASAYUKI
    • B60Q11/00H05B39/10H05B41/46
    • B60Q11/005H05B39/10
    • A device for automatically compensating failure of a lamp in which voltage drop across a series resistor is applied to the emitter of a transistor for detecting failure of a lamp and the forward voltage drop across a diode is applied to the base of said transistor to restrain the voltage drop across the series resistor, and the main current of a transistor circuit controlled by the failure detecting transistor is made to flow through a resistor to form a positive feedback to said failure detecting transistor within the range controlled by said diode and resistor thereby to further lower the voltage drop across the series resistor. The failure detecting transistor is sufficiently turned on by the above-mentioned circuit arrangement to energize a backup lamp.
    • 一种用于自动补偿灯的故障的装置,其中串联电阻器的电压降被施加到用于检测灯的故障的晶体管的发射极和二极管两端的正向压降之间,以限制所述晶体管的基极 串联电阻两端的电压降,并且由故障检测晶体管控制的晶体管电路的主电流流过电阻器,以在由所述二极管和电阻器控制的范围内对所述故障检测晶体管形成正反馈,从而进一步 降低串联电阻上的电压降。 故障检测晶体管通过上述电路装置充分地导通,以对备用灯通电。