首页>
外国专利>
Glass coating on current lead-through conductors in a low-pressure sodium discharge lamp
Glass coating on current lead-through conductors in a low-pressure sodium discharge lamp
展开▼
机译:低压钠放电灯中电流引导导体上的玻璃涂层
展开▼
页面导航
摘要
著录项
相似文献
摘要
A device (1) for supplying electric power to a load (4) connected to the device in a power-on mode comprises a driver stage (7), a control unit (9), adapted to supply turn-on pulses to the driver stage (7), and an output stage (12) with a switching transistor (1) which can be driven into its conductive state for a time interval (TEIN) by the driver stage (7) in the power-on mode when turn-on pulses occur, and which can be driven into its non-conductive state after expiry of the time interval (TEIN), the driver stage (7) being also adapted to monitor the operating temperature (TS) of the switching transistor (11) and to activate a power-off mode when the operating temperature (TS) of the switching transistor (11) exceeds a first limit temperature (TG1), in which power-off mode the switching transistor (11) is permanently driven into its non-conductive state by the driver stage (7) in spite of the occurrence of turn-on pulses (IS), the driver stage (7) further comprising a sensing transistor (21), a sensing resistor (22), a turn-on transistor (23), a turn-on resistor (24) for monitoring the operating temperature (TS) of the switching transistor (11), as well as a zener diode (29) and a turn-off stage (32) for obtaining a short switching time of the switching transistor (11), the sensing transistor (21) being arranged so as to be substantially uninfluenced by the operating temperature (TS) of the switching transistor (11).
展开▼