宽输入电压单级电子镇流器

Wide Line Input Voltage Single-Stage Electronic Ballast

LCC串并联谐振变换电路与Buck-Boost有源功率因数校正电路构成的单管荧光灯单级自激电子镇流器存在着输出功率对输入电压过于敏感的问题。给出了一种不改变自激电子镇流器的简化性、低价性前提下,减少这种敏感性的简单方法。当输入电源电压增大时,Buck-Boost电路的占空比减小,输出功率基本保持稳定。当电源电压在+5%-～10%范围内变化时,该电路的输出功率稳定在+1%-～1.3%范围内,使开关器件的开关损耗降低,效率达到92%,功率因数大于0.99。实验证明该电路的性能稳定。

It is a puzzle that the output power is highly sensitive to the input voltage for a single-stage electronic ballast fluorescent lamps based on the integration of LCC series-parallel connection resonant inverter and a buck-boost active power factor correction circuit.A simple method to reduce the sensitivity is presented and did not increase the simplification and the cost of the ballast.When the line input voltage is enhanced,the duty cycle of Buck-Boost circuit will be deduced and output power will present a small variation.The output power of it will vary from ＋1% to 1.3% while the in-put voltages vary from ＋5% to -10% and the switch dissipation was low.The ballast＇s efficiency and power factor would be up to 92% and beyond 0.99 respectively.Experimental results show it performing stably.