公开(公告)号：US06424101B1

公开(公告)日：2002-07-23

申请号：US09730430

申请日：2000-12-05

申请人： Juan A. Sabate

发明人： Juan A. Sabate

IPC分类号： G05F100

CPC分类号： H05B41/392 ,  H02M7/53803 ,  H02M2001/0022 ,  H05B41/2827 ,  Y02B20/185 ,  Y02B70/1441

摘要： An electronic ballast which is capable of compactly powering a discharge lamp from a source of rectified, but unregulated, power having a varying DC voltage. The ballast includes a selfoscillating converter powered by the DC voltage for producing pulses at a nominal operating frequency which is determined by a resonant tank. The resonant tank converts the pulses to a sinusoidal current for powering the discharge lamp and includes an inductive impedance.in series with the lamp for providing a voltage drop which varies with the operating frequency. A feed-forward control circuit is coupled to the converter for automatically varying the operating frequency directly with variations in the DC source voltage. The voltage drop across the inductive impedance is substantially proportional to the magnitude of the DC source voltage. This enables regulation of the voltage supplied to the discharge lamp by the ballast without sensing the lamp voltage itself.

摘要翻译： 一种电子镇流器，其能够从具有变化的DC电压的整流但未调节的功率源紧凑地为放电灯供电。 镇流器包括由直流电压供电的自激振荡转换器，用于产生由谐振槽确定的标称工作频率的脉冲。 谐振槽将脉冲转换成正弦电流，为放电灯供电，并且包括与灯串联的电感阻抗，用于提供随工作频率变化的电压降。 前馈控制电路耦合到转换器，用于随着直流电源电压的变化而直接自动地改变工作频率。 电感阻抗两端的电压降基本上与直流电源电压的幅度成比例。 这样可以调节通过镇流器提供给放电灯的电压，而无需感测灯电压本身。

公开(公告)号：US06400584B1

公开(公告)日：2002-06-04

申请号：US09815692

申请日：2001-03-23

申请人： Juan A. Sabate ,  Gert W. Bruning

发明人： Juan A. Sabate ,  Gert W. Bruning

IPC分类号： H02M3335

CPC分类号： H02M1/44 ,  H02M3/33592 ,  H02M3/3376 ,  H02M2001/0022 ,  H02M2001/0058 ,  Y02B70/1433 ,  Y02B70/1475 ,  Y02B70/1491

摘要： A switching power supply is provided in two stages with the primary of the power transformer being in the first stage and the secondary in the second stage. The first stage includes an EMI filter connected to the input of a rectifier. The output of the rectifier is connected to a self oscillating, half-bridge, resonant inverter operating in open loop with the primary of the transformer to provide isolation from the power source. Feed-forward control is used to compensate for line variations, providing very small output voltage variation compared with input voltage variation. In the second stage, the secondary of the transformer provides an input to post regulator circuitry including a PWM control circuit to regulate the output current using the error signal representing the differences between the current sensed and the desired value.

摘要翻译： 开关电源分两级设置，电源变压器的主电源处于第一级，第二级为次级。 第一级包括连接到整流器输入端的EMI滤波器。 整流器的输出端连接到自谐振半桥谐振逆变器，与变压器主开关一起工作，以提供与电源的隔离。 前馈控制用于补偿线路变化，与输入电压变化相比，提供非常小的输出电压变化。 在第二阶段中，变压器的次级提供了一个输入到后稳压器电路，包括PWM控制电路，以使用表示电流感测和期望值之间的差的误差信号来调节输出电流。