首页>
外国专利>
High power factor, high-frequency operating circuit for a low- pressure discharge lamp
High power factor, high-frequency operating circuit for a low- pressure discharge lamp
展开▼
机译：低压放电灯的高功率因数高频工作电路
展开▼
页面导航
摘要
著录项
相似文献
摘要
To insure high power factor for the operating circuit of a low- pressure discharge lamp, especially of miniature fluorescent lamps, a high-frequency active rectifier bridge (D1-D4) is provided which interrupts charging of a smoothing capacitor (C2), which smoothing capacitor supplies an inverter circuit (WR) in the switching rhythm of the inverter. A storage choke or inductance (L1), a negative feedback capacitor (CG) and an auxiliary capacitor (CS) are coupled to the high- frequency rectifier bridge (D1-D4) which, together with the inductance insure an approximately sinusoidal current being taken from a power network, with a power factor of 0.98 or higher. Preferably, the circuit includes voltage dividers (R8, R9, R11; R15, R16, R17) which are coupled to a voltage sensitive trigger circuit (DI, TH) to turn OFF alternate switching of transistors (T1, T2) of the inverter (WR) in case excess supply voltage or operating voltages of the lamp are sensed.
展开▼
