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    • 4. 发明授权
    • Dimmer
    • 调光器
    • US4321509A
    • 1982-03-23
    • US150352
    • 1980-05-16
    • Masahiro MiyajiHisashi Hirose
    • Masahiro MiyajiHisashi Hirose
    • H05B37/02B60Q3/04H02M3/156H05B39/04
    • H02M3/1563
    • A dimmer suitable for use to control the intensity of illumination of a lamp or lamps for illuminating an instrument panel provided in a compartment of a vehicle such as a motor car, comprises: a dimming transistor connected to a lamp or lamps to be dimmed for controlling an electric current supplied to said lamp or lamps, a switching circuit connected to said dimming transistor for generating pulses having a controllable duty ratio to cause said dimming transistor to turn `ON` on `OFF`, surge voltage sensing means for sensing a surge voltage applied to an electric source line, and transistor shutoff means for shutting off said dimming transistor in response to a signal from said surge voltage sensing means.
    • 适用于控制用于照亮设置在诸如汽车的车辆的隔室中的仪表板的灯或灯的照明强度的调光器包括:连接到要被调暗以控制的灯或灯的调光晶体管 提供给所述灯或灯的电流,连接到所述调光晶体管的开关电路,用于产生具有可控占空比的脉冲,以使所述调光晶体管导通“断开”,浪涌电压检测装置,用于感测浪涌电压 施加到电源线,以及晶体管截止装置,用于响应于来自所述浪涌电压感测装置的信号来关闭所述调光晶体管。