公开(公告)号：US5568368A

公开(公告)日：1996-10-22

申请号：US595453

申请日：1996-02-05

申请人： Robert L. Steigerwald ,  Gerald W. Ludwig

发明人： Robert L. Steigerwald ,  Gerald W. Ludwig

IPC分类号： H02J3/38 ,  H02M1/12 ,  H02M3/335 ,  H02M3/337

CPC分类号： H02J3/38 ,  H02M1/12 ,  H02M3/33561 ,  H02M3/337 ,  Y02B70/1433

摘要： A converter for an ac power distribution system provides a square-wave voltage of low output impedance to an ac power distribution bus for driving a plurality of loads, each load including a rectifier and an input filter capacitor. Slew-rate limiting capacitors are employed to limit the rate of change of voltage on the ac distribution bus, thereby substantially reducing or eliminating conducted and radiated interference from the power distribution system due to high-frequency components of current which would otherwise flow in parasitic capacitances. In addition, zero-voltage switching is employed to achieve highly efficient converter operation. As other advantages, this converter scheme allows for simplification of converters at the load end of the power distribution system (e.g., to simple rectifiers with post regulators), while producing lower ac line currents, lower current harmonics and higher power factors than those of a sine-wave generation system.

摘要翻译： 用于交流配电系统的转换器为交流配电总线提供低输出阻抗的方波电压，用于驱动多个负载，每个负载包括整流器和输入滤波电容器。 采用压摆率限制电容器来限制交流配电总线上的电压变化率，从而大大减少或消除由于电流的高频分量导致的配电系统的传导和辐射干扰，否则这些电流将以寄生电容的形式流动 。 此外，采用零电压开关来实现高效率的转换器操作。 作为其他优点，该转换器方案允许在配电系统的负载端（例如，具有后稳压器的简单整流器）上简化转换器，同时产生较低的交流线路电流，较低的电流谐波和更高的功率因数 正弦波发生系统。

公开(公告)号：US4922404A

公开(公告)日：1990-05-01

申请号：US323639

申请日：1989-03-15

申请人： Gerald W. Ludwig ,  Gerhard A. Franz

发明人： Gerald W. Ludwig ,  Gerhard A. Franz

IPC分类号： H02M7/217

CPC分类号： H02M7/2173

摘要： A synchronous rectifier circuit employs therein a pair of synchronously-operated switches, each switch being coupled between a separate respective input terminal and an output terminal of the circuit. One of the synchronously-operated switches is gated ON when a voltage applied across the synchronous rectifier circuit input terminals is of one polarity, and is gated OFF when current therein becomes substantially zero. The second switch is gated ON when a voltage applied across the input terminals is of the opposite polarity, and is gated OFF when current therein becomes substantially zero.

摘要翻译： 同步整流电路中使用一对同步操作的开关，每个开关耦合在电路的分离的相应输入端子和输出端子之间。 当同步整流电路输入端子施加的电压为一个极性时，同步操作的开关中的一个被门控接通，并且当其中的电流基本上为零时门控关闭。 当施加在输入端子上的电压具有相反极性时，第二开关选通导通，并且当其中的电流基本上为零时门控关闭。

公开(公告)号：US5446350A

公开(公告)日：1995-08-29

申请号：US228826

申请日：1994-04-18

申请人： Sayed-Amr El-Hamamsy ,  Gerald W. Ludwig ,  David O. Wharmby ,  Louis R. Nerone

发明人： Sayed-Amr El-Hamamsy ,  Gerald W. Ludwig ,  David O. Wharmby ,  Louis R. Nerone

IPC分类号： H05B41/24 ,  H05B41/28 ,  H05B37/00

CPC分类号： H05B41/2806 ,  Y02B20/22

摘要： An impedance matching circuit for a self-oscillating electrodeless fluorescent lamp ballast of the type having an inductor connected in series with the parallel combination of a capacitor and the lamp's drive coil includes an additional capacitor connected in series with the drive coil. The capacitance value chosen for the additional capacitor is dependent on: stresses on the parallel capacitor; matching the impedance of the ballast; and the impact of the capacitor on the loaded coil phase angle. The additional capacitor reduces the phase angle presented to the ballast, thereby lowering the sensitivity of the ballast to component and lamp variations. In addition, the overall impedance of the network is reduced, such that the required inductance of the series inductor is reduced; hence, the inductor can have fewer turns and lower conduction losses. The current in inductor for the required power level is lower, resulting in a further reduction in conduction losses as well as a reduction in core losses due to lower flux in the core. Still further, a reduction of stresses on the inductor results in a reduced operating temperature, and hence increased efficiency, reliability and ballast life.

摘要翻译： 具有与电容器和灯的驱动线圈的并联组合串联的电感器的自振荡无电极荧光灯镇流器的阻抗匹配电路包括与驱动线圈串联连接的附加电容器。 为附加电容选择的电容值取决于：并联电容器上的应力; 匹配镇流器的阻抗; 以及电容对负载线圈相位角的影响。 额外的电容器可以降低镇流器的相位角，从而降低镇流器对零件和灯泡变化的灵敏度。 此外，网络的整体阻抗减小，使得串联电感器所需的电感减小; 因此，电感器可以具有较少的匝数和较低的传导损耗。 对于所需功率电平，电感中的电流较低，导致传导损耗进一步降低，以及由于芯中的较低通量引起的磁芯损耗的减小。 此外，电感器上的应力减小导致工作温度降低，因此提高了效率，可靠性和镇流器寿命。