公开(公告)号：US07075254B2

公开(公告)日：2006-07-11

申请号：US11011468

申请日：2004-12-14

申请人： Venkatesh Chitta ,  Brent M. Gawrys

发明人： Venkatesh Chitta ,  Brent M. Gawrys

IPC分类号： G05F1/00

CPC分类号： H05B41/282 ,  H05B41/3921 ,  H05B41/3927 ,  Y02B20/183 ,  Y10S315/05 ,  Y10S315/07

摘要： A ballast for driving a gas discharge lamp comprising a rectifier stage having an alternating current (AC) input and providing a rectified output voltage, a boost converter stage receiving the rectified output voltage as an input and providing a boosted direct current (DC) output voltage across a DC bus, an inverter output stage for converting the DC bus voltage to a high-frequency AC output voltage to drive the lamp, further comprising a control stage receiving a desired light level signal controlling the desired light level of the lamp and providing an output control signal for turning the boost converter stage on or off in dependency on the desired light level signal. The ballast thereby has reduced power consumption at low light levels for greater energy efficiency.

摘要翻译： 一种用于驱动气体放电灯的镇流器，包括具有交流（AC）输入并提供整流输出电压的整流器级，升压转换器级接收整流输出电压作为输入，并提供升压的直流（DC）输出电压 通过DC总线，用于将DC总线电压转换为高频AC输出电压以驱动灯的逆变器输出级，还包括控制级，其接收控制灯的期望光电平的期望的光电平信号，并提供一个 用于根据期望的光电平信号使升压转换器级接通或关断的输出控制信号。 因此，镇流器在低光级下降低了功率消耗，提高了能源效率。

公开(公告)号：US06791279B1

公开(公告)日：2004-09-14

申请号：US10392105

申请日：2003-03-19

申请人： Thomas M. Shearer ,  Venkatesh Chitta ,  Brent M. Gawrys ,  Robert C. Newman, Jr. ,  Mark Taipale

发明人： Thomas M. Shearer ,  Venkatesh Chitta ,  Brent M. Gawrys ,  Robert C. Newman, Jr. ,  Mark Taipale

IPC分类号： H05B3702

CPC分类号： H05B41/2822 ,  H05B41/2824 ,  Y10S315/04

摘要： An electronic ballast for a fluorescent lamp has a single-switch flyback inverter including a magnetizing inductance, a resonant circuit connected to the output of the inverter including a tank inductor, and a clamp circuit including a diode coupled to the primary winding of the flyback transformer for limiting the voltage across the magnetizing inductance when the switch is non-conductive. With the inverter switch conductive the resonant circuit has a first resonant frequency. With the inverter switch non-conductive, the resonant circuit, combined with the magnetizing inductance, has a second resonant frequency lower than the first. The magnetizing inductance is chosen such that the second resonant frequency is close to the first resonant frequency. The operating frequency of the inverter is controlled to be at or about the second resonant frequency, whereby zero current switching is achieved in the inverter switch.

摘要翻译： 一种用于荧光灯的电子镇流器具有单开关反激逆变器，其包括磁化电感，连接到包括壳体电感器的逆变器的输出的谐振电路，以及包括耦合到回扫变压器的初级绕组的二极管的钳位电路 用于限制当开关不导通时磁化电感两端的电压。 随着逆变器开关导通，谐振电路具有第一谐振频率。 随着逆变器开关不导通，谐振电路与磁化电感相结合，具有低于第一谐振频率的第二谐振频率。 选择磁化电感使得第二谐振频率接近第一谐振频率。 逆变器的工作频率被控制在第二谐振频率或约为第二谐振频率，从而在逆变器开关中实现零电流切换。